Note: Descriptions are shown in the official language in which they were submitted.
COMPOSITE CROS SARNI AND POWER TRANSMISSION TOWER
TECHNICAL FIELD
The present application relates to the field of power transmission technology,
in particular to a
composite crossarm and a power transmission tower.
BACKGROUND
A composite material has advantages of light weight, high strength, corrosion
resistance, easy
processing, designability and good insulation performance, etc., and thus
becomes one of the ideal
materials used to make power transmission towers. The towers made of the
composite material have
advantages of light tower weight, small-sized tower head, lightweight
structure, easy processing and
forming, low cost in transportation and assembly, corrosion resistance, high
and low temperature
resistance, high strength, low possibility of theft, and low cost in line
maintenance etc.
The inventors of the present application found that there is room for
improvement in the performance
of the current towers made of the composite material. The current composite
crossarm is generally
formed by a combination of post insulators and suspension insulators. Although
the composite cross=
includes various types such as a single-post structure, a single-post single-
suspension structure, and a
double-post single-suspension structure, there is still room for improvement
in the stability of these
types of the composite crossarms.
SUMMARY
An object of this application is to provide a composite crossarm and a power
transmission tower, which
can ensure the stability of the composite crossarm.
In order to solve the above technical problems, a technical solution adopted
in this application is as
follows. A composite crossarm is provided. The composite crossarm includes a
post insulator and three
suspension insulators. The post insulator and the suspension insulators each
has an end configured to
be connected to a tower body of a power transmission tower, and another end
connected together to
form an end of the composite crossarm that is configured to attach a
transmission line. The three
suspension insulators are arranged at intervals around the post insulator.
Axes of the two suspension
insulators and an axis of the post insulator are in the same plane. The two
suspension insulators whose
axes are in the same plane as the axis of the post insulator are defined as
first suspension insulators, the
remaining suspension insulator is defined as a second suspension insulator.
The two first suspension
insulators form an angle ranged from 45 to 90'; the second suspension
insulator and the post insulator
form an angle ranged from 25 to 45 .
On the one hand, in the above composite crossarm, one post insulator and three
suspension insulators
are connected together to form the end for attaching the transmission line, so
that a stable triangular
structure is formed between the composite crossarm and the tower body, which
can greatly improve the
stability performance of the composite crossarm. On the other hand, the angle
formed between the two
first suspension insulators is in a range from 45 to 90 , which can provide
favorable conditions when
disposing a first grading ring and an end fitting on a high-voltage end (an
end away from the tower
body) of the post insulator, and disposing second grading rings on high-
voltage ends (ends away from
the tower body) of the two first suspension insulators. The angle formed
between the second suspension
insulator and the post insulator is in a range from 25 to 45 , which can
provide favorable conditions
when disposing the first grading ring on the high-voltage end of the post
insulator, and disposing a third
grading ring on the high-voltage end (an end away from the tower body) of the
second suspension
insulator.
In an embodiment, the composite crossarm further includes first suspension
link fittings configured to
connect the tower body and the first suspension insulators. The first
suspension link fitting includes: a
first sub-link fitting connected to the first suspension insulator; and a
second sub-link fitting, having an
end adjustably connected to the first sub-link fitting, and another end
configured to connect the tower
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Date Recue/Date Received 2022-01-05
body, such that the first suspension insulator is connected to the tower body.
Providing the first suspension link fitting, the configuration of the
composite crossarm can be changed
in various ways, which is applicable for different application scenarios.
In an embodiment, the first sub-link fitting is provided with a plurality of
first mounting portions
arranged in an arc shape. The second sub-link fitting is selectively connected
to one of the first mounting
portions.
Providing the first mounting portions, a length of the first suspension link
fitting is adjustable.
In an embodiment, the composite crossarm further includes a second suspension
link fitting. The second
suspension link fitting is configured to connect the tower body and the second
suspension insulator, and
has a fixed length.
The second suspension link fitting can ensure a firmly connection between the
tower body and the
second suspension insulator.
In an embodiment, the post insulator includes: an insulating body; a shed
covering a periphery of the
insulating body; a post link fitting connected to an end of the insulating
body to mount the post insulator
on the tower body. The post link fitting includes: an end flange tube having a
hollow structure along an
axial direction thereof, and sleeved on the end of the insulating body; an end
flange plate covering an
end of the end flange tube away from the insulating body; and a first mounting
plate, an end of the first
mounting plate abutting against a plate surface of the end flange plate away
from the end flange tube.
The first mounting plate is configured to be connected to the tower body to
mount the post insulator.
Configuring the end flange plate to cover the end of the end flange tube away
from the insulating body
can ensure that the post insulator is not corroded by external moisture, etc.,
prolonging the service life
of the post insulator.
In an embodiment, two first mounting plates are provided, and the two first
mounting plates are
perpendicular to the end flange plate.
The two first mounting plates can ensure the stability of the connection
between the post insulator and
the tower body.
In an embodiment, the insulating body is a solid insulating core, or the
insulating body is a hollow
insulating tube. Insulating gas is sealed in the hollow insulating tube. An
absolute pressure value of the
insulating gas is in a range from 0.1 Mpa to 0.15 Mpa.
Configuring the insulating body to be the hollow insulating tube and the
insulating gas sealed therein
to have an absolute pressure value ranged from 0.1 Mpa to 0.15 Mpa, daily
maintenance and monitoring
of the post insulator can be avoided.
In an embodiment, the shed includes a plurality of identical shed bodies
arranged at intervals. The shed
bodies are symmetrical with respect to a radial direction of the insulating
body.
Configuring the shed bodies to be symmetrical with respect to the radial
direction of the insulating body,
it is beneficial to the self-cleaning of the shed, and enables the post
insulator to have the characteristics
of dirt resistance, rain flash resistance, ice flash resistance, and the like.
In an embodiment, the another end of the post insulator is connected to the
another end of the suspension
insulator through an end fitting. The end fitting includes: a first flange
tube having a hollow structure
along an axial direction thereof, and configured to be sleeved on an end of
the post insulator; a covering
plate covering an end of the first flange tub; and an attachment plate,
provided at a side of the covering
plate away from the first flange tube, connected to the covering plate, and
configured to attach the
transmission line.
The end fitting is provided with the covering plate to cover the end of the
first flange tub, such that
when the attachment plate used to attach the transmission line is damaged and
thus needs to be replaced,
the covering plate can ensure that the post insulator inside the first flange
tube is not corroded by
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Date Recue/Date Received 2022-01-05
external moisture, etc., thereby ensuring the service life of the post
insulator.
In an embodiment, the end fitting further includes: a connecting plate,
disposed on a periphery of the
first flange tube, connected to the first flange tube, and configured to be
connected to the suspension
insulator.
The connecting plate provided on the periphery of the first flange tube is
used to connect the suspension
insulator, which can avoid damaging the first flange tube when directly using
the first flange tube to
connect the suspension insulator (for example, providing a hole on the first
flange tube), so as to ensure
the strength of the first flange tube.
In an embodiment, the end fitting further includes: a second flange tube
having a hollow structure along
an axial direction thereof, provided coaxially with the first flange tube, and
connected to another end of
the first flange tube away from the covering plate. An outer peripheral
surface of the second flange tube
is smooth.
Providing the second flange tube, a crimping process can be used to fix the
end fitting on the periphery
of the post insulator, which can improve production efficiency and reduce
production costs.
In an embodiment, the first flange tube is detachably connected to the second
flange tube.
Configuring the first flange tube to be detachably connected to the second
flange tube facilitates the
transportation. In addition, when the first flange tube or the second flange
tube is damaged, the first
flange tube or the second flange tube can be replaced in time, thereby
avoiding scrapping the entire end
fitting.
In order to solve the above technical problems, another technical solution
adopted in this application is
as follows. A power transmission tower is provided. The power transmission
tower includes a tower
body, and the composite crossarm as described above, connected to the tower
body.
The beneficial effect achieved by the present application is as follows. On
the one hand, in the above
composite crossarm according to the present application, one post insulator
and three suspension
insulators are connected together to form the end for attaching the
transmission line, so that the stable
triangular structure is formed between the composite crossarm and the tower
body, which can greatly
improve the stability performance of the composite crossarm. On the other
hand, the angle formed
between the two first suspension insulators is set to be in a range from 45
to 90 , which can provide
favorable conditions when disposing the first grading ring and the end fitting
on the high-voltage end
(the end away from the tower body) of the post insulator, and disposing the
second grading rings on the
high-voltage ends (ends away from the tower body) of the two first suspension
insulators. The angle
formed between the second suspension insulator and the post insulator is set
to be in a range from 25
to 45 , which can provide favorable conditions when disposing the first
grading ring on the high-voltage
end of the post insulator, and disposing the third grading ring on the high-
voltage end (the end away
from the tower body) of the second suspension insulator.
In addition, in the post link fitting connecting the tower body and the post
insulator, configuring the end
flange plate to cover the end of the end flange tube away from the insulating
body, it is can be ensured
that the post insulator is not corroded by external moisture, etc., thereby
prolonging the service life of
the post insulator.
In addition, configuring the second sub-link fitting of the first suspension
link fitting to be adjustably
connected to the first sub-link fitting, the length of the first suspension
link fitting is adjustable, and the
configuration of the composite crossarm can be changed in various ways, which
is applicable for
different application scenarios.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to illustrate the technical solutions in the embodiments of the
present application more clearly,
the drawings required to be uses in the description of the embodiments will be
briefly introduced below.
Apparently, the drawings in the following description only illustrate some
embodiments of the present
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Date Recue/Date Received 2022-01-05
application. For those of ordinary skill in the art, other drawings can be
obtained based on these
drawings without creative work, in which:
FIG. 1 is a structural schematic view of a power transmission tower according
to an embodiment of the
present application;
FIG. 2 is a structural schematic view of a composite crossarm in FIG. 1;
FIG. 3 is an enlarged schematic view of a portion A in FIG. 2;
FIG. 4 is a structural schematic view of a post insulator connected to an end
fitting in FIG. 2;
FIG. 5 is a cross-sectional schematic view taken in a line C-C of FIG. 4;
FIG. 6 is a structural schematic view of an end fitting in FIG. 3;
FIG. 7 is a structural schematic view of the end fitting in FIG. 3, when being
viewed in another
perspective;
FIG. 8 is a structural schematic view of an attachment plate connected to a
wire clamp in an application
scenario;
FIG. 9 is a structural schematic view of a yoke plate;
FIG. 10 is a cross-sectional schematic view of the end fitting taken in a line
D-D of FIG. 7;
FIG. 11 is an enlarged schematic view of a portion E in FIG. 10;
FIG. 12 is an enlarged schematic view of a portion F of FIG. 10 in an
application scenario;
FIG. 13 is an enlarged schematic view of the portion F of FIG. 10 in another
application scenario;
FIG. 14 is an enlarged schematic view of a portion B in FIG. 2;
FIG. 15 is an enlarged schematic view of a portion H in FIG. 1;
FIG. 16 is an enlarged schematic view of a portion I in FIG. 2;
FIG. 17 is a structural schematic view of a composite crossarm according to
another embodiment;
FIG. 18 is an enlarged schematic view of a portion G in FIG. 17;
FIG. 19 is a structural schematic view of an end fitting in FIG. 18;
FIG. 20 is an exploded structural schematic view of the end fitting of FIG.
19;
FIG. 21 is a structural schematic view of a power transmission tower according
to another embodiment;
FIG. 22 is a partial structural schematic view of FIG. 21;
FIG. 23 is an enlarged schematic view of a portion J in FIG. 22;
FIG. 24 is a partial structural schematic view of FIG. 21;
FIG. 25 is an enlarged schematic view of a portion K in FIG. 22;
FIG. 26 is a structural schematic view of an ending fitting according to an
embodiment of the present
application;
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Date Recue/Date Received 2022-01-05
FIG. 27 is a structural schematic view of an ending fitting according to
another embodiment of the
present application; and
FIG. 28 is a structural schematic view of a composite crossarm according to an
embodiment of the
present application.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The technical solutions in the embodiments of the present application will be
clearly and completely
described below in conjunction with the drawings in the embodiments of the
present application.
Apparently, the described embodiments are only a part of the embodiments of
the present application,
rather than all the embodiments. Based on the embodiments in this application,
all other embodiments
obtained by a person of ordinary skill in the art without creative work shall
fall within the protection
scope of this application.
Referring to FIGS. 1 to 3, a power transmission tower 1000 includes a tower
body 1100 and a composite
crossarm 1200 connected to the tower body 1100. The composite crossarm 1200
includes a post
insulator 1210 and suspension insulators 1220.
The tower body 1100 may be a common structure such as a lattice type iron
tower, a steel tube tower or
a tower made of a composite material. In this embodiment, the tower body 1100
is a lattice type iron
tower, and the drawings only show a part of the tower body 1100.
One end of the post insulator 1210 and one end of the suspension insulator
1220 are both connected to
the tower body 1100, and another end of the post insulator 1210 and another
end of the suspension
insulator 1220 are connected to each other through an end fitting 1230. In
this embodiment, one post
insulator 1210 is provided, and at least two, such as two, three, four or even
more suspension insulators
1220 are provided. At least two suspension insulators 1220 are arranged at
intervals around the post
insulator 1210. Axes of the two suspension insulators 1220 and an axis of the
post insulator 1210 are in
the same plane.
Specifically, at least two suspension insulators 1220 are connected with the
post insulator 1210 through
the end fitting 1230. The axes of the two suspension insulators 1220 and the
axis of the post insulator
1210 are in the same plane, so that a stable triangular structure is formed
between the composite
crossarm 1200 and the tower body 1100, which can greatly improve the stability
of the composite
crossarm 1200.
Continuing to refer to FIG. 2, in this embodiment, three suspension insulators
1220 are provided. The
two suspension insulators 1220 whose axes are in the same plane as the axis of
the post insulator 1210
are defined as first suspension insulators 1221, the remaining suspension
insulator 1220 is defined as a
second suspension insulator 1222. Distances from the second suspension
insulator 1222 to the two first
suspension insulators 1221 are the same. The two first suspension insulators
1221 form an angle ranged
.. from 45 to 90 , for example, an angle of 45 , 60 , or 90 . The second
suspension insulator 1222 and
the post insulator 1210 form an angle ranged from 25 to 45 , for example, an
angle of 25 , 30 , 35 ,
or 45 .
Specifically, considering that the greater the angle formed between the two
first suspension insulators
1221, the greater the mechanical strength that the composite crossarm 1200 can
withstand, but a length
of the composite crossarm 1200 and a width of the tower body 1100 also need to
be increased
accordingly. Therefore, the angle formed between the two first suspension
insulators 1221 is controlled
to be in a range from 45 to 90 , which not only meets the force requirements
of the composite crossarm
1200, but also optimizes the length of the composite crossarm 1200 and the
width of the tower body
1100. Similarly, controlling the range of the angle formed between the second
suspension insulator 1222
and the post insulator 1210 to be in a range from 20 to 45 can also achieve
the same purpose.
Specifically, three sets of composite crossarms (not shown in figures) are
arranged on the tower body
1100 in sequence from bottom to top. Lengths of the three sets of composite
crossarms gradually
decrease or increase or the like. That is, in a vertical direction of the
power transmission tower 1000, a
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Date Recue/Date Received 2022-01-05
length of the post insulator gradually decreases or increases or the like from
bottom to top. The greater
the length of the post insulator, the smaller the angle formed between the two
first suspension insulators
of the set of composite crossarms. Assuming that the angle formed between the
two first suspension
insulators 1221 is defined as a, the length of the post insulator 1210 is
defined as L, a width of the tower
body 1100 perpendicular to the post insulator 1210 in a horizontal direction
is defined as D, a width of
the tower body 1100 parallel to the post insulator 1210 in the horizontal
direction is defined as n, and a
distance from a connection point of the two first suspension insulators 1221
extending out of the tower
body 1100 to the tower body 1100 is defined as m, the following can be derived
from the trigonometric
formula:
¨+m
tan a ¨ 2
2 L+¨n
2
In an application scenario, taking a power transmission tower 1000 of 220kV as
an example, L is in a
range from 2000 mm to 4000 mm, D is in a range from 2000 mm to 3000mm, m is
generally set to 1000
mm, and n is generally set to 1000 mm. From the above, it can be calculated
that the minimum value
of a is 47.9 , and the maximum value of a is 90 . Since m and n can be
adjusted, the angle formed
between the two first suspension insulators 1221 can be controlled to be in a
range from 45 to 90 .
Similarly, assuming that the angle formed between the second suspension
insulator 1222 and the post
insulator 1210 is defined as 13, and the distance from a connection point
between the post insulator 1210
and the tower body 1100 to a connection point between the second suspension
insulator 1222 and the
tower body 1100 is defined as H, the following equation can be obtained by the
trigonometric formula:
H
tan p = ¨ .
Taking a power transmission tower 1000 of 220kV as an example, H is generally
set to 2000 mm. From
the above, it can be calculated that the minimum value of 13 is 26.6 , and the
maximum value of 13 is
45 . Since H can be further adjusted, the angle formed between the post
insulator 1210 and an adjacent
suspension insulator 1220 can be controlled to be in a range from 25 to 45 .
In addition, the angle formed between the two first suspension insulators 1221
is set to be in a range
from 45 to 90 , which can provide favorable conditions when disposing a first
grading ring (not shown
in figures) and the end fitting 1230 on a high-voltage end (an end away from
the tower body 1100) of
the post insulator 1210, and disposing second grading rings 12201 on high-
voltage ends (ends away
from the tower body 1100) of the two first suspension insulators 1221.
Specifically, it can ensure that
.. there is no interference between the first grading ring on the post
insulator 1210 and the second grading
ring 12201 on the first suspension insulator 1221, there is no interference
between the second grading
rings 12201 on the two first suspension insulators 1221, and there is no
interference between the first
grading ring on the post insulator 1210 and the end fitting 1230, also no
interference between the second
grading ring 12201 on the first suspension insulator 1221 and the end fitting
1230.
In addition, the angle formed between the second suspension insulator 1222 and
the post insulator 1210
is set to be in a range from 25 -45 , which can provide favorable conditions
when disposing the first
grading ring on the high-voltage end of the post insulator 1210 and disposing
a third grading ring 12202
on a high-voltage end (an end away from the tower body 1100) of the second
suspension insulator 1222.
Specifically, it can ensure that the first grading ring disposed on the post
insulator 1210 and the third
.. grading ring 12202 disposed on the second suspension insulator 1222 when
mounted in a dislocation.
Continuing to refer to FIGS. 1 and 2, in this embodiment, the post insulator
1210 and the two first
suspension insulators 1221 are mounted in a same height, and the second
suspension insulator 1222 is
located above the post insulator 1210. It should be noted that in other
embodiments, when more than
one second suspension insulator 1222 is provided, the second suspension
insulators 1222 can be
.. provided above and below the post insulator 1210, so that the tensile
forces of the transmission line in
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Date Recue/Date Received 2022-01-05
various directions can be balanced. When the second suspension insulator 1222
is located above the
post insulator 1210, the second suspension insulator 1222 can act as a tensile
support to prevent the end
of the post insulator 1210 away from the power transmission tower 1000 from
bending downwards after
the transmission line is attached thereto to affect the long-term service life
of the post insulator 1210.
The post insulator 1210 may be provided horizontally (in FIG. 1, which is
shown to be provided
horizontally), or may be provided obliquely.
In addition, in order to ensure the composite crossarm 1200 is uniformly
stressed, an angle formed
between one of the two first suspension insulators 1221 and the post insulator
1210 is equal to an angle
formed between the other of the two first suspension insulators 1221 and the
post insulator 1210. In this
condition, the axes of the two first suspension insulators 1221 and the axis
of the post insulator 1210
are in the same horizontal plane.
Of course, in other embodiments, the angle formed between one of the two first
suspension insulators
1221 and the post insulators 1210 may also be unequal to the angle formed
between the other of the two
first suspension insulators 1221 and the post insulator 1210, which is not
limited herein.
The other two composite crossarms have structures similar to the composite
crossarm 1200, and which
will not be repeated herein.
Referring to FIGS. 4 and 5, in this embodiment, the post insulator 1210
includes an insulating body
1211 and a shed 1212 covering a periphery of the insulating body 1211.
Specifically, the insulating body 1211 may be a solid insulating core or a
hollow insulating tube. When
the insulating body 1211 is a solid insulating core, it may be a solid core
rod formed by winding or
pultrusion, or winding and pultrusion of glass fiber or aramid fiber
impregnated with epoxy resin. When
the insulating body 1211 is a hollow insulating tube, it may be a hollow
pultruded tube formed by
pultrusion and winding of glass fiber or aramid fiber impregnated with epoxy
resin; or may be a fiber
glass reinforced plastic tube formed by winding and curing or pultrusion of
glass fiber impregnated
with epoxy resin; or may be an aramid fiber tube formed by winding and curing
aramid fiber
impregnated with epoxy resin, which is not limited herein.
The insulating body 1211 may be cylindrical (illustrated by a cylindrical
shape in the drawings), conical
or other shapes (such as a drum shape), which is not limited herein. When the
insulating body 1211 is
conical, a tapered end (an end with a smaller diameter) of the insulating body
1211 is connected to the
end fitting 1230, and another end thereof is connected to the tower body 1100,
so that the post insulator
1210 can withstand much more pressure from the transmission line.
In an application scenario, when the insulating body 1211 is a hollow
insulating tube, insulating gas is
sealed in the insulating body 1211. An absolute pressure value of the
insulating gas is in a range from
0.1 Mpa to 0.15 Mpa, for example, 0.1 Mpa, 0.12 Mpa, or 0.15 Mpa.
Specifically, the gas sealed in the hollow insulating tube may be dried high-
purity nitrogen, air, or sulfur
hexafluoride, which is not limited herein.
In addition, setting the absolute pressure value of the insulating gas to be
in a range from 0.1Mpa to
0.15Mpa can make the insulating gas uneasy to leak from the hollow insulating
tube, which can avoid
the daily maintenance and monitoring of the post insulator 1210, and further
meet different pressure
requirements between different regions and altitudes, to ensure that the
internal gas of the hollow
insulating tube is in a non-negative pressure state when used in different
regions, and further, the hollow
insulating tube can have a larger margin of moisture control, effectively
reducing the difficulty of
moisture control.
In other application scenarios, when the insulating body 1211 is a hollow
insulating tube, inert gas or
solid materials such as polyurethane and liquid silicone rubber can be sealed
in the insulating body 1211,
which is not limited herein.
In addition, the shed 1212 can be made of high-temperature vulcanized
silicone, liquid silicone rubber,
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Date Recue/Date Received 2022-01-05
room temperature vulcanized silicone rubber or the like, which is not limited
herein.
In an application scenario, the shed 1212 includes a plurality of identical
shed bodies arranged at
intervals. That is, all shed bodies are the same, and the shed bodies are
symmetrical with respect to a
radial direction of the insulating body 1211, that is, two opposite surfaces
of the shed body have opposite
inclination directions with same inclination angles. Specifically, the shed
bodies are symmetrical with
respect to the radial direction of the insulating body 1211, such that, on the
one hand, compared with
the prior art in which the two opposite surfaces of the shed body are inclined
in the same direction, in
the present application, rainwater can flow down along the shed 1212 (due to
that the post insulator
1210 is provided horizontally, if the two opposite surfaces of the shed body
are inclined in the same
direction, the rainwater is likely to accumulate in an angle formed between
the insulating body 1211
and the shed body), so that no water film is formed on the surface of the shed
1212, and it is beneficial
to the self-cleaning of the shed 1212; and on the other hand, the two opposite
sides of the shed body
can have the same mechanical properties, so that the post insulator 1210 has
the characteristics of dirt
resistance, rain flash resistance, ice flash resistance, more economy and the
like.
In an application scenario, in order to avoid bridging caused by turbulence
and dirt accumulation
between two adjacent shed bodies, a distance between two adjacent shed bodies
is greater than 40 mm
and not more than 60 mm, for example, 45 mm, 50 mm or 60 mm. Of course, the
distance between two
adjacent shed bodies should be reduced as much as possible, so as to increase
the distribution density
of shed bodies and make it difficult for birds to stand on the sheath, thereby
preventing bird damage
accidents. In addition, under the requirement of ensuring the minimum creepage
distance, a height of
the shed body protruding from a side of the insulating body 1211 is not more
than 80 mm, generally set
to 50 mm-80mm, such as 50 mm, 60 mm or 70 mm.
It should be noted that, in other embodiments, the shed 1212 may also have
other structures. For
example, two adjacent shed bodies have different sizes, or the two opposite
surfaces of the shed body
are inclined in the same direction. In short, the specific structure of the
shed 1212 is not limited in the
present application.
Referring to FIGS. 3, 6 and 7, in this embodiment, the end fitting 1230
includes a first flange tube 1231,
a covering plate 1232, and an attachment plate 1233.
The first flange tube 1231 has a hollow structure along an axial direction
thereof, and is used to be
sleeved the end of the post insulator 1210, specifically, sleeved on the end
of the insulating body 1211
in the post insulator 1210. The covering plate 1232 covers an end of the first
flange tube 1231. The
attachment plate 1233 is provided at a side of the covering plate 1232 away
from the first flange tube
1231 and is connected to the covering plate 1232, and is configured to attach
the transmission line.
Specifically, when the attachment plate 1233 used to attach the transmission
line is damaged and thus
needs to be replaced, since the covering plate 1232 covers one end of the
first flange tube 1231, it can
be ensured that the post insulator 1210 inside the first flange tube 1231 is
not corroded by external
moisture, etc., thereby ensuring the service life of the post insulator 1210.
Continuing to refer to FIGS. 6 and 7, one end of the attachment plate 1233
abuts against a surface of a
side of the covering plate 1232 away from the first flange tube 1231, and a
reinforcing member 1234 is
further connected between a side surface of the attachment plate 1233 and the
covering plate 1232.
Specifically, the reinforcing member 1234 can enhance a connection between the
attachment plate 1233
and the covering plate 1232, and avoid the connection between the attachment
plate 1233 and the
covering plate 1232 from being broken due to insufficient connection strength.
In an application scenario, as shown in FIG. 6, the reinforcing member 1234 is
a plate member, and the
covering plate 1232, the attachment plate 1233, and the reinforcing member
1234 are perpendicular to
each other.
In order to prevent the end fittings 1230 from being corroded by moisture,
etc., a surface of the end
fittings 1230 is hot dip galvanized. In addition, the end fittings 1230 can be
made of cast aluminum,
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Date Recue/Date Received 2022-01-05
cast iron or alloy steel, etc., which is not limited herein.
In addition, various parts of the end fittings 1230 can be connected together
by welding or the like.
Continuing to refer to FIG. 6, the attachment plate 1233 is provided with a
first wire attaching portion
12331 which can be used to attach the power transmission line. Specifically, a
wire clamp for connecting
the transmission line is provided on the first wire attaching portion 12331,
so as to attach the
transmission line. One, two, four or even more first wire attaching portions
12331 may be provided,
which is not limited herein. When a plurality of first wire attaching portions
12331 are provided, a
plurality of wire clamps connected to the same transmission line can be
mounted on the plurality of first
wire attaching portions 12331 respectively, such that when one of the wire
clamps is damaged, it can
still be ensured that the transmission line is safely attached.
In an application scenario, as shown in FIG. 6, the first wire attaching
portion 12331 is a wire attaching
through-hole. The side surface of the attachment plate 1233 without the first
wire attaching portion
12331 is connected to the reinforcing member 1234. Specifically, this
configuration can ensure that the
reinforcing member 1234 cannot affect the mounting of the wire clamp on the
attachment plate 1233.
In addition, in this application scenario, one first wire attaching portion
12331 is provided, and the
attachment plate 1233 is further provided with a construction hole 12332 for
lifting operation. Of course,
in other application scenarios, more than one first wire attaching portion
12331 may be provided.
In an application scenario, as shown in FIG. 8, when the attachment plate 1233
is used to attach a single
transmission line, the attachment plate 1233 is connected with a U-shaped
hanging ring 123301.
Specifically, two ends of the U-shaped hanging ring 123301 are connected to
the attachment plate 1233,
and the U-shaped hanging ring 123301 is connected to the wire clamp 123302
used for dangling the
transmission line.
When the attachment plate 1233 is used to attach two transmission lines, the
attachment plate 1233 is
also connected with the U-shaped hanging ring 123301, but unlike attaching a
single transmission line,
the U-shaped hanging ring 123301 is further connected to a middle yoke plate.
In this case, the middle
yoke plate connects two wire clamps 123302 used for dangling the transmission
lines respectively. In
an application scenario, a cross section of the middle yoke plate is
substantially in a shape of an isosceles
triangle, two wire clamps 123302 are connected to two bottom corners of the
middle yoke plate
respectively, and the U-shaped hanging ring 123301 is connected to a top
corner of the middle yoke
plate.
In an application scenario, referring to FIG. 9, the composite crossarm 1200
further includes a yoke
plate 1235, which is used to connect to the attachment plate 1233. The yoke
plate 1235 is provided with
a second wire attaching portion 12351 that can be used to attach the
transmission line. The number of
the second wire attaching portions 12351 is greater than the number of the
first wire attaching portions
12331. Specifically, due to the area limitation of the attachment plate 1233,
the number of the first wire
attaching portions 12331 allowed to be provided is limited, which cannot meet
the wire attaching
requirements in some application scenarios, and the configuration of the yoke
plate 1235 can expand
the number of the first wire attaching portions 12331.
In an application scenario, in order to be able to adapt to the requirements
of different application
scenarios, the yoke plate 1235 is connected to the attachment plate 1233
through a length-adjustable
link fitting (not shown in figures), so that a relative distance between the
yoke plate 1235 and the
attachment plate 1233 can be adjusted according to the requirements in
different application scenarios.
In an application scenario, the second wire attaching portion 12351 has same
structure as the first wire
attaching portion 12331, for example, both of them are wire attaching through-
holes. Of course, the
second wire attaching portion 12351 may have a different structure than the
first wire attaching portion
12331. For example, the first wire attaching portion 12331 is a wire attaching
through-hole, and the
second wire attaching portion 12351 is a wire attaching slot. In short, the
specific structures of the first
wire attaching portion 12331 and the second wire attaching portion 12351 are
not limited in the present
application.
9
Date Recue/Date Received 2022-01-05
Referring to FIGS. 3, 6 and 7, in this embodiment, the end fitting 1230
further includes a connecting
plate 1236. The connecting plate 1236 is disposed on the periphery of the
first flange tube 1231, is
connected to the first flange tube 1231, and is configured to be connected to
the suspension insulator
1220.
Specifically, the connecting plate 1236 may be disposed on the periphery of
the first flange tube 1231
by means such as welding or the like.
Providing the connecting plate 1236 on the periphery of the first flange tube
1231 to connect the
suspension insulator 1220, can avoid damage to the first flange tube 1231 (for
example, providing a
hole on the first flange tube 1231) when the suspension insulator 1220 is used
to connect the first flange
tube 1231 directly, so as to ensure the strength of the first flange tube
1231.
In this embodiment, one, or at least two connecting plates 1236 may be
provided. When one connecting
plate 1236 is provided, in order to connect all the suspension insulators
1220, the connecting plate 1236
can extend around the first flange tube 1231 to form a semi-enclosing
structure or a full-enclosing
structure. When at least two connecting plates 1236 are provided, different
connecting plates 1236 can
be connected to different suspension insulators 1220. That is, the number of
connecting plates 1236 can
be equal to the number of suspension insulators 1220. In addition, at least
two connecting plates 1236
are arranged at intervals in a circumferential direction of the first flange
tube 1231 (as shown in FIGS.
3 and 6).
Referring to FIGS. 7 and 10, in this embodiment, an inner wall of the first
flange tube 1231 is provided
with a plurality of binding grooves 12311 arranged at intervals along the
axial direction and a plurality
of flowing grooves 12312 that are in communication with the plurality of
binding grooves 12311. The
binding grooves 12311 and the flowing grooves 12312 are filled with adhesives
to connect the first
flange tube 1231 to the insulating body 1211 fixedly.
Specifically, in the production process, the end fittings 1230 and the
insulating body 1211 are connected
to each other by using a horizontal binding process or a vertical binding
process. During the production
process, an adhesive is firstly injected between the first flange tube 1231
and the insulating body 1211
through an adhesive injecting hole, and then is cured at a high temperature
for a certain period of time,
so that the end fittings 1230 and the insulating body 1211 can be fixedly
connected to each other.
The flowing grooves 12312 are arranged along an axial direction of the flange
tube 1231. The
configuration of the flowing grooves 12312 can let the adhesive injected
between the first flange tube
1231 and the insulating body 1211 flow between the adjacent binding grooves
12311, such that the
adhesive injecting rate can be increased, the risk of bubble detention can be
reduced. As such, the end
fittings 1230 and the insulating body 1211 are more firmly bonded to each
other, so as to improve the
torsion resistance performance of the composite crossarm 1200 without
replacing the adhesive with
another adhesive with better bonding performance.
One or more (for example, two, four, six or even more) flowing grooves 12312
can be provided. When
a plurality of flowing grooves 12312 are provided, the plurality of flowing
grooves 12312 are arranged
at intervals along the circumferential direction of the first flange tube
1231. One flowing groove 12312
may only be in communication with two adjacent binding grooves 12311, or may
be in communication
with three adjacent, four adjacent or even all the binding grooves 12311,
which is not limited herein.
A bottom surface of the flowing groove 12312 is a flat surface or a curved
surface. Specifically, when
a radial depth and a width of the flowing groove 12312 with respect to the end
fittings 1230 are constant,
the flowing groove 12312 with a flat bottom surface is more complex and
expensive to be processed
than the flowing groove 12312 with a curved bottom surface, but has higher
torsional strength, because
of the larger contact area between the adhesive in the flat groove and the
inner wall of the first flange
tube 1231. That is, compared with the flowing groove 12312 with the flat
bottom surface, the flowing
groove 12312 with the curved bottom surface is convenient to be processed and
has low processing cost,
but has a slightly lower torsional strength.
Referring to FIGS. 10 and 11, in the axial direction of the flange tube 1231,
the plurality of binding
Date Recue/Date Received 2022-01-05
grooves 12311 have the same widths, and a width of the binding grooves 12311
is smaller than a width
of an interval between two adjacent binding grooves 12311. Specifically, the
width of the binding
groove 12311 is provided to be smaller than the width of the interval between
the two adjacent binding
grooves 12311, so that an binding matching groove on the insulating body 1211
(not shown in the
figures, which has the same specification as and is provided opposite to the
binding groove 12311 on
the first flange tube 1231) also has a width smaller than a width of the
interval between two adjacent
binding matching grooves. This configuration can ensure the shear resistance
of the post insulator 1210,
compared with the width of the binding matching groove on the insulating body
1211 being greater than
or equal to the width of the interval between two adjacent binding matching
grooves.
The width of the binding groove 12311 does not exceed 12 mm. Specifically, the
axial shear strength
of the insulating body 1211 itself is relatively low. When the insulating body
1211 is damaged, a part
that is sleeved into the first flange tube 1231 and is not bonded by the
adhesive, that is, a part on the
insulating body 1211, which is located between two adjacent binding matching
grooves, is firstly
damaged. When a width of the first flange tube 1231 along its axial direction
is constant, if the width
of the binding groove 12311 decreases, the distance between two adjacent
binding grooves 12311 will
increase. That is, the distance between the two adjacent binding matching
grooves on the insulating
body 1211 will increase, and thus the strength of the insulating body 1211
against shear failure will
increase, which will eventually increase the shear resistance of the post
insulator 1210 of the same
specification. However, if the width of the binding groove 12311 is too small,
the processing time and
processing cost will increase. Therefore, the width of the binding groove
12311 should not exceed 12
mm, for example, 12 mm, 10 mm or 8 mm, etc., which can not only ensure the
strength of the composite
crossarm 1200, but also ensure the processing time and processing cost are all
within a reasonable range.
In order to facilitate processing, the bottom surface of the binding groove
12311 is a curved surface.
A ratio of a length of a contact portion between the inner wall of the first
flange tube 1231 and the
insulating body 1211 to an outer diameter of the insulating body 1211 (i.e., a
binding ratio) is in a range
from 0.8 to 1.2, for example, which is 0.8, 1.0 or 1.2. Specifically, as the
binding ratio decreases, the
strength of the composite crossarm 1200 will decrease significantly. For
example, compared to the
binding ratio of 0.8, when the binding ratio drops to 0.75, the strength of
the composite crossarm 1200
will decrease by 20%. Compared to the binding ratio of 1.2, when the binding
ratio increases to 1.4,
although the strength of the composite crossarm 1200 will increase slightly,
the cost will increase
significantly. Therefore, the binding ratio is in a range from 0.8 to 1.2,
such that the composite crossarm
1200 has the advantages of low cost and high strength.
In addition, it should be noted that, in other embodiments, the binding groove
12311 and the flowing
groove 12312 may also have other sizes, which are not limited herein.
.. In an application scenario, referring to FIGS. 5, 7, 10 and 12, a plate
surface of the covering plate 1232
facing the insulating body 1211 is provided with a first sealing groove 12321
facing an end surface of
the insulating body 1211. The first sealing groove 12321 is provided with a
first sealing member (not
shown in figures) therein. Specifically, the first sealing member is disposed
in the first sealing groove
12321 to prevent external moisture or the adhesive from entering the
insulating body 1211, to avoid
leakage of gas in the insulating body 1211, and to prevent external moisture
or the adhesive from
entering the covering plate 1232 to affect the sealing between the insulating
body 1211 and the end
fittings 1230.
Continuing to refer to FIGS. 10 and 12, the inner wall of the first flange
tube 1231 is further provided
with a second sealing groove 12313 adjacent to the covering plate 1232. The
second sealing groove
12313 and the plurality of binding grooves 12311 are arranged alternately at
intervals in a direction
away from the covering plate 1232. The second sealing groove 12313 is provided
with a second sealing
member (not shown in the figure) therein. Specifically, the second sealing
member has different
function than that of the first sealing member. The second sealing member is
used to prevent the
adhesive from entering the first sealing groove 12321 to corrode the first
sealing member and cause the
first sealing member to fail during the adhesive boning process.
11
Date Recue/Date Received 2022-01-05
A width of the first sealing groove 12321 and/or a width of the second sealing
groove 12313 remain
unchanged in a direction close to the insulating body 1211 (as shown in FIG.
12) or decrease gradually
(as shown in FIG. 13). Specifically, the first sealing groove 12321 whose
width remains unchanged in
the direction close to the insulating body 1211 is easy to be processed, but
the first sealing member
therein is prone to slip or even fall off. In this case, in order to avoid the
relative slip of the first sealing
member in the first sealing groove 12321, the first sealing member is fixedly
bonded in the first sealing
groove 12321 by resin or silicone. Compared with the first sealing groove
12321 whose width remains
unchanged in the direction close to the insulating body 1211, the first
sealing groove 12321 whose width
decreases gradually in the direction close to the insulating body 1211 has a
more complicated processing
process, but it can be ensured that the first sealing member will not easily
fall off. The width of the first
sealing groove 12321 and/or the width of the second sealing groove 12313 can
decrease linearly in the
direction close to the insulating body 1211 (as shown in FIG. 13), or can
decrease curvilinearly, which
is not limited herein.
Referring to FIGS. 2 and 14, in this embodiment, the composite crossarm 1200
further includes a
suspension link fitting 1240 used for connecting the tower body 1100 and the
suspension insulator 1220.
In this embodiment, a length of the suspension link fitting 1240 connecting
the tower body 1100 and
the first suspension insulator 1221 is adjustable, and a length of the
suspension link fitting 1240
connecting the tower body 1100 and the second suspension insulator 1222 is
fixed. For ease of
description, the suspension link fitting 1240 connecting the tower body 1100
and the first suspension
insulators 1221 is defined as a first suspension link fitting 1241, and the
suspension link fitting 1240
connecting the tower body 1100 and the second suspension insulator 1222 is
defined as a second
suspension link fitting 1242.
The first suspension link fitting 1241 includes a first sub-link fitting 12411
and a second sub-link fitting
12412.
The first sub-link fitting 12411 is connected to the first suspension
insulator 1221. An end of the second
sub-link fitting 12412 is adjustably connected to the first sub-link fitting
12411, and another end thereof
is used to connect the tower body 1100, such that the first suspension
insulator 1221 is connected to the
tower body 1100. Specifically, one end of the second sub-link fitting 12412 is
adjustably connected to
the first sub-link fitting 12411, so that the configuration of the composite
crossarm 1200 can be changed
in various ways, which is applicable for different application scenarios.
In an application scenario, as shown in FIG. 14, the first sub-link fitting
12411 is provided with a
plurality of first mounting portions 124111 arranged in an arc shape. The
second sub-link fitting 12412
is selectively connected to one of the first mounting portions 124111.
Specifically, the plurality of first
mounting portions 124111 are arranged in an arc shape, so that the distance
and the relative angle
between the tower body 1100 and the first suspension insulator 1221 can be
adjusted.
In an application scenario, as shown in FIG. 14, the first sub-link fitting
12411 is a fan-shaped flat fitting,
and the second sub-link fitting 12412 is a slot fitting.
In other embodiments, the plurality of first mounting portions 124111 may also
be arranged in a straight
line along an extending direction of the first suspension insulator 1221,
which is not limited herein.
In other embodiments, it is also possible that the second sub-link fitting
12412 is connected to the first
suspension insulator 1221, and the first sub-link fitting 12411 is connected
to the tower body 1100,
which is not limited herein.
In addition, in other embodiments, both of, or neither of the suspension link
fitting 1240 that connects
the tower body 1100 and the first suspension insulator 1221, and the
suspension link fitting 1240 that
connects the tower body 1100 and the second suspension insulator 1222 can be
adjusted in length. In
other words, the first suspension link fitting 1241 or the second suspension
link fitting 1242 can connect
the tower body 1100 and the first suspension insulator 1221. Similarly, the
first suspension link fitting
1241 or the second suspension link fitting 1242 can connect the tower body
1100 and the second
suspension insulator 1222, which is not limited herein.
12
Date Recue/Date Received 2022-01-05
Referring to FIGS. 1, 2, 15 and 16, in this embodiment, the post insulator
1210 further includes a post
link fitting 1250 used for connecting the tower body 1100 and the post
insulator 1210. The post link
fitting 1250 includes an end flange tube 1251, an end flange plate 1252 and a
first mounting plate 1253.
The end flange tube 1251 has a hollow structure along an axial direction
thereof, and is sleeved on the
end of the post insulator 1210 connected to the tower body 1100, specifically
sleeved on one end of the
insulating body 1211. The end flange plate 1252 covers an end of the end
flange tube 1251 away from
the insulating body 1211 to prevent the end of the insulating body 1211 from
being corroded by external
moisture or the like, and to protect the insulating body 1211. An end of the
first mounting plate 1253
abuts against a plate surface of the end flange plate 1252 away from the end
flange tube 1251. In addition,
.. the first mounting plate 1253 is provided with a second mounting portion
12531 used for mounting the
first mounting plate 1253 on the tower body 1100, to connect the post
insulator 1210 and the tower
body 1100. In an application scenario, the second mounting portion 12531 is a
through hole. In this
case, a fastener such as a bolt may be used to pass through the through hole
to mount the first mounting
plate 1253 on the tower body 1100.
In an application scenario, as shown in FIG. 16, the first mounting plate 1253
is a straight plate. In order
to ensure the firmly connection between the tower body 1100 and the post
insulator 1210, two first
mounting plates 1253 are provided. The two first mounting plates 1253 are
arranged in parallel with
each other. Of course, in other application scenarios, one, three, or more
first mounting plates 1253 may
also be provided. In addition, as shown in FIG. 16, the two first mounting
plates 1253 are both vertically
disposed on the end flange plate 1252. Of course, in other application
scenarios, the first mounting plate
1253 may not be vertically disposed on the end flange plate 1252, which is not
limited herein.
Continuing to combine FIGS. 1 and 15, in order to adapt the post link fitting
1250 to different
application scenarios, the post link fitting 1250 further includes a second
mounting plate 1254. The
second mounting plate 1254 is detachably connected to the first mounting plate
1253 used for
connecting the first mounting plate 1253 and the tower body 1100, so that the
first mounting plate 1253
can be directly connected to the tower body 1100 according to different
requirements, or the first
mounting plate 1253 can be connected to the tower body 1100 through the second
mounting plate 1254.
In an application scenario, as shown in FIG. 15, in order to increase the
contact area between the second
mounting plate 1254 and the tower body 1100 and ensure the connection strength
between the second
mounting plate 1254 and the tower body 1100, the second mounting plate 1254 is
a bent plate. An end
of the bent plate 1254 is attached to a beam of the tower body 1100, and
another end thereof is attached
to the first mounting plate 1253.
In an application scenario, with reference to FIGS. 15 and 16, the number of
first mounting plates 1253
is equal to the number of second mounting plates 1254, and when one second
mounting plate 1254 is
mounted, and correspondingly, one first mounting plate 1253 is mounted.
Referring to FIGS. 17 to 19, unlike the foregoing embodiments, in the
composite crossarm 2200 of this
embodiment, the end fitting 2230 further includes a second flange tube 2237.
The second flange tube
2237 has a hollow structure along an axial direction thereof. The second
flange tube 2237 is provided
coaxially with the first flange tube 2231 and connected to another end of the
first flange tube 2231 away
from the covering plate 2232. An outer peripheral surface of the second flange
tube 2237 is smooth.
Specifically, since the outer peripheral surface of the second flange tube
2237 is smooth, this second
flange tube 2237 with the smooth outer peripheral surface can be fixed around
the post insulator 2210
by a crimping process. In addition, since the first flange tube 2231 is
connected to the second flange
tube 2237, when the second flange tube 2237 is fixed around the post insulator
2210 by the crimping
.. process, the first flange tube 2231 can also be fixed around the post
insulator 2210. That is, the end
fitting 2230 is fixed around the post insulator 2210 by the crimping process.
In the foregoing embodiments, the end fitting 1230 is mounted on the post
insulator 1210 by the binding
process. Compared with the crimping process, the binding process has a long
process time, low molding
efficiency, and requires a large number of molding tooling, and the molded
post insulator 1210 bears
13
Date Recue/Date Received 2022-01-05
the bending load and the torsion load poorly. That is, in this embodiment, the
crimping process is used
to mount the end fitting 2230 on the post insulator 2210, which can improve
production efficiency and
reduce production costs (reducing the number of molding toolings that are
used), and ensure that the
post insulator 2210 can bear the bending load and torsion load well.
In this embodiment, the first flange tube 2231 is detachably connected to the
second flange tube 2237.
This configuration can detach the end fittings 2230 during transportation,
facilitating the transportation.
In addition, when the first flange tube 2231 or the second flange tube 2237 is
damaged, the first flange
tube 2231 or the second flange tube 223 can be replaced in time, thereby
avoiding scrapping the entire
end fitting 2230.
In addition, during transportation, only the second flange tube 2237 can be
fixed on the post insulator
2210. Then, after reaching the destination, the first flange tube 2311 can be
connected to the second
flange tube 2237, thereby reducing the packaging cost of the post insulator
2210 during transportation.
Referring to FIGS. 19 and 20, the end fitting 2230 further includes a first
flange plate 2238 and a second
flange plate 2239.
The first flange plate 2238 is disposed at another end of the first flange
tube 2231 away from the
covering plate 2232 and is sleeved on the periphery of the first flange tube
2231. The second flange
plate 2239 is disposed at an end of the second flange tube 2237 and is sleeved
on the periphery of the
second flange tube 2237. The first flange plate 2238 is detachably connected
to the second flange plate
2239, to realize the detachable connection between the first flange tube 2231
and the second flange tube
2237. Specifically, this configuration can indirectly increase the contact
area between the first flange
tube 2231 and the second flange tube 2237, thereby increasing the connection
strength between the first
flange tube 2231 and the second flange tube 2237.
Referring to FIG. 20, the first flange plate 2238 and the second flange plate
2239 are respectively
provided with corresponding locking holes 22381, so that the first flange
plate 2238 can be connected
to the second flange plate 2239 by locking members (such as bolts) passing
through the locking holes
22381.
In other embodiments, the first flange plate 2238 and the second flange plate
2239 may also be provided
with clamping structures that match with each other, so that the first flange
plate 2238 is detachably
connected to the second flange plate 2239 in a clamping manner. In a word,
there is no limitation on
how to realize the detachable connection between the first flange plate 2238
and the second flange plate
2239.
In other embodiments, in addition to the first flange tube 2231 and the second
flange tube 2237, the end
fitting 2230 may further include a third flange tube, a fourth flange tube, or
even more flange tubes.
That is, in this case, more than two flange tubes are provided in the end
fitting 2230. Moreover, in this
case, a plurality of flange tubes in the end fitting 2230 are coaxially
disposed, and connected in sequence.
For example, the fourth flange tube, the third flange tube, the second flange
tube 2237, and the first
flange tube 2231 are connected in sequence, or the second flange tube 2237,
the fourth flange tube, the
third flange tube, and the first flange tube 2231 are connected in sequence.
In addition to the smooth
outer peripheral surface of the second flange tube 2237, the third flange
tube, the fourth flange tube or
.. other flange tubes can also be flange tubes with a smooth outer peripheral
surface. Alternatively, the
suspension insulator 2220 can be connected to the third flange tube, the
fourth flange tube or other
flange tubes, in addition to the first flange tube 2231.
In addition, when the end fitting 2230 further includes the third flange tube,
the fourth flange tube or
even more flange tubes, the connection between two adjacent flange tubes can
be the same as the
connection between the first flange tube 2231 and the second flange tube 2237.
For example, two
adjacent flange tubes can be detachably connected to each other. Two adjacent
flange tubes can be
detachably connected to each other through flange plates sleeved on their
respective ends. The two
flange plates that are detachably connected to each other are respectively
provided with lock holes
22381 that match with each other, so that the two adjacent flange plates can
be connected to each other
14
Date Recue/Date Received 2022-01-05
by the locking member passing through the lock holes 22381.
Referring to FIGS. 21 and 22, FIG. 21 is a structural schematic diagram of a
power transmission tower
according to another embodiment of the present application, and FIG. 22 is a
partial structural schematic
view of FIG. 21. Unlike the above embodiments, a tower body 3100 according to
this embodiment
includes a tower pole 3110. Ends of a post insulator 3210 and suspension
insulators 3220 in a composite
crossarm 3200 are all connected to the tower pole 3110.
The tower pole 3110 may be a steel tube pole, or a hollow pole or a solid pole
made of other materials
such as composite materials, iron, alloys, which is not limited herein.
In order to mount the composite crossarm 3200 on the tower pole 3110,
referring to FIG. 23, a power
transmission tower 3000 further includes a crossarm link fitting 3300. The
crossarm link fitting 3300
connects an end of the post insulator 3210 that is not connected to the
suspension insulator 3220 and an
end of the suspension insulator 3220 that is not connected to the post
insulator 3210, to the tower pole
3110, such that the composite crossarm 3200 is mounted on the tower body 3100,
in particular, on the
tower pole 3110.
The crossarm link fitting 3300 includes a connecting rod 3310, a tower flange
tube 3320, and a tower
flange plate 3330.
In this embodiment, three suspension insulators 3220 are provided, in which
two suspension insulators
3220 whose axes are in the same plane as an axis of the post insulator 3210
are both defined as first
suspension insulators 3221, and the remaining suspension insulators 3220 is
defined as a second
suspension insulator 3222. Distances from the second suspension insulator 3222
to the two first
suspension insulators 3221 are the same.
For the convenience of description, a suspension link fitting 3240 connecting
the tower pole 3110 and
the first suspension insulators 3221 is defined as a first suspension link
fitting 3241, and a suspension
link fitting 3240 connecting the tower pole 3110 and the second suspension
insulator 3222 is defined as
a second suspension link fitting 3242.
Two connecting rods 3310 are provided. The two connecting rods 3310
respectively connect the two
first suspension insulators 3221 and the tower pole 3110. That is, the first
suspension link fitting 3241
connected to the end of the first suspension insulator 3221 is connected to
the connecting rod 3310. An
end of the tower flange tube 3320 is connected to the tower pole 3110. The
tower flange plate 3330
covers an end of the tower flange tube 3320 away from the tower pole 3110, and
is connected to the
post insulator 3210.
In an application scenario, as shown in FIGS. 22 and 23, the two connecting
rods 3310 are provided
perpendicular to the tower pole 3110, and heights of the two connecting rods
3310 with respect to the
tower pole 3110 are the same.
Of course, in other application scenarios, the two connecting rods 3310 may
not be provided
perpendicular to the tower pole 3110. Alternatively, the heights of the two
connecting rods 3310 with
respect to the tower pole 3110 may also be different. The specific
configuration of the two connecting
rods 3310 can be determined by the structure of the composite crossami 3200,
which is no limited
herein.
In another application scenario, the two connecting rods 3310 and the tower
flange tube 3320 are all
fixed to the tower pole 3110 by welding, or can also be fixed in other forms,
which are not limited
herein.
In addition, unlike the above-mentioned embodiments, as shown in FIGS. 22 and
23, the tower flange
plate 3330 of the crossarm link fitting 3300 is butted with an end flange
plate 3252 of a post link fitting
3250 to mount the post insulator 3210.
Continuing to refer to FIGS. 22 and 23, the crossarm link fitting 3300 further
includes a reinforcing
ring 3340 and a reinforcing rib 3350.
Date Recue/Date Received 2022-01-05
The reinforcing ring 3340 is sleeved on the periphery of the tower pole 3110.
Two ends of the
reinforcing rib 3350 are connected to the reinforcing ring 3340 and the tower
flange tube 3320
respectively, and side wall of the reinforcing rib 3350 is attached to the
tower pole 3110, which further
increases a contact area between the tower flange tube 3320 and the tower pole
3110, ensuring the
connection strength between the tower flange tube 3320 and the tower pole
3110.
One or two reinforcing rings 3340 can be provided. When two reinforcing rings
3340 are provided, as
shown in FIG. 23, the two reinforcing rings 3340 are provided at opposite
sides of a part where the
tower flange tubes 3320 are provided oppositely. For the tower flange tube
3320, the tower flange tube
3320 is connected to the two reinforcing rings 3340 through two reinforcing
ribs 3350, respectively.
Continuing to refer to FIG.S 22 and 23, the crossarm link fitting 3300 further
includes a reinforcing
plate 3360. Two ends of the reinforcing plate 3360 are respectively connected
to the connecting rod
3310 and the tower flange tube 3320, and one side wall of the reinforcing
plate 3360 is attached to the
tower pole 3110, thereby indirectly increasing the contact area between the
connecting rod 3310, the
tower flange tube 3320 and the tower pole 3110, ensuring the connection
strength between the
connecting rod 3310, the tower flange tube 3320 and the tower pole 3110.
In order to further increase the connection strength between the connecting
rod 3310 and the tower
flange tube 3320, the connecting rod 3310 can also be connected to the
reinforcing ring 3340 through
the reinforcing rib 3350. In this case, the reinforcing rib 3350 connecting
the reinforcing ring 3340 and
the connecting rod 3310 is provided in the same manner as the reinforcing rib
3350 connecting the
reinforcing ring 3340 and the tower flange tube 3320, which can refer to the
above for details, and will
not be repeated herein.
It should be noted that both of, either of, or neither of the reinforcing ring
3360 and the reinforcing ring
3340 may be provided (referring to FIGS. 21 and 24 for details).
In addition, the reinforcing rings 3340, the reinforcing rib 3350 and the
reinforcing plate 3360 can all
be fixedly connected to the two connecting rods 3310 and the tower flange tube
3320 by welding, etc.,
to form the crossarm link fitting 3300. Of course, the crossarm link fitting
3300 can also be provided in
one piece, and which is not limited herein.
Continuing to refer to FIG. 22, the crossarm link fitting 3300 further
includes a connecting lug 3370.
The connecting lug 3370 is fixed on the tower pole 3110. The connecting lug
3370 can be fixed to the
tower pole 3110 in the same way as the connecting rod 3310 and the tower
flange tube 3320 being
fixing to the tower pole 3110, which will not be repeated herein.
The suspension link fitting 3240 (the second suspension link fitting 3242)
connected to the end of the
second suspension insulator 3222 is connected to the connecting lug 3370.
Specifically, the second
suspension link fitting 3242 is connected to the connecting lug 3370 by a U-
shaped ring. The connecting
lug 3370 is a thin plate, and provided with connecting holes. When the U-
shaped ring and the second
suspension link fitting 3242 are connected to each other and locked by
fasteners, the fasteners also pass
through the connecting holes on the connecting lug 3370 to achieve locking and
fixing. In other
embodiments, the second suspension link fitting 3242 can also be connected to
the tower pole 3110
through the connecting rod 3310, which is not limited herein.
In an application scenario, as shown in FIGS. 22 and 25, both another end of
the post insulator 3210
and another end of the suspension insulators 3220 that are not connected to
the tower body 3100 are
connected to each other by an end fitting 3230. The end fitting 3230 includes
a flange tube 3231, a
covering plate 3232 and a link plate. The flange tube 3231 has a hollow
structure along an axial direction
thereof, and is used to be sleeved on the end of the post insulator 3210,
specifically, sleeved on the end
of the insulating body (not shown in figures) in the post insulator 3210. The
covering plate 3232 is a
polygonal plate. The covering plate 3232 covers an end of the flange tube 3231
to ensure that the post
insulator 3210 inside the flange tube 3231 is not corroded by external
moisture, etc., so as to ensure the
service life of the post insulator 3210. The link plate is provided at the
periphery of the flange tube 3231
and is connected to the flange tube 3231, and is used to be connected to the
suspension insulator 3220.
16
Date Recue/Date Received 2022-01-05
In order to prevent the end fitting 3230 from being corroded by moisture,
etc., the surface of the end
fittings 3230 is hot-dip galvanized, and the end fitting 3230 can be made of
cast aluminum, cast iron or
alloy steel, which is not limited herein.
In addition, the various parts of the end fitting 3230 can be connected to
each other by welding or the
like.
Continuing to refer to FIG. 25, the covering plate 3232 is provided with a
wire attaching portion 32321
that can be used to attach the transmission line. Specifically, a wire clamp
used for connecting the
transmission line is mounted on the wire attaching portion 32321, so as to
attach the transmission line.
One, two, four or even more wire attaching portions 32321 can be provided,
which is not limited herein.
When a plurality of the wire attaching portions 32321 are provided, a
plurality of wire clamps connected
to the same transmission line can be mounted on the plurality of wire
attaching portions 32321
respectively, such that when one of the wire clamps is damaged, it can still
be ensured that the
transmission line is safely attached.
In an application scenario, as shown in FIG. 25, the wire attaching portion
32321 is a wire attaching
through-hole 32321. The covering plate 3232 is provided with two wire
attaching through-holes 32321
on two sides away from the flange tube 3231. The wire clamps are mounted on
the two wire attaching
through-holes 32321 respectively, to attach the transmission line.
In other application scenarios, as shown in FIG. 26, an end fitting 4230 has a
structure similar to the
end fittings 3230, except that one wire attaching through-hole 42321 on a
covering plate 4232 is
provided. The wire attaching through-hole 42321 is located in a middle and
lower part of the covering
plate 4232, and a wire clamp is mounted on the wire attaching through-hole
42321 to attach the
transmission line. Continuing to refer to FIG. 25, the end fitting 3230 is
further provided with a grading
ring 3233. The grading ring 3233 includes two sets of ring members 32331 that
are provided opposite
to each other and a connecting member 32332. The connecting member 32332
fixedly connects the ring
member 32331 and the end fitting 3230. Specifically, the ring member 32331 is
an arc-shaped metal
tube member, the connecting member 32332 includes a plurality of metal plates.
An end of the
connecting member 32332 is connected to an inner side of the ring member
32331, by welding or
fastening. Another end of the connecting member 32332 is connected to the end
fitting 3230,
specifically fixedly connected to the covering plate 3232, by welding or
fastening. As such, the ring
member 32331 forms the grading ring 3233 around the end fitting 3230.
Referring to FIG. 27, the present application further provides an end fitting
5000. The end fitting 5000
has the same structure as the end fitting 1230 according to the foregoing
embodiments. For details,
reference may be made to the foregoing embodiments, which will not be repeated
herein.
Referring to Fig. 28, the present application further provides a composite
crossarm 6000. The composite
crossarm 6000 has the same structure as the composite crossarm 1200 according
to the foregoing
embodiments. For details, reference may be made to the foregoing embodiments,
which will not be
repeated herein.
The above are only implementations of this application, and do not limit the
scope of this application.
Any equivalent structure or equivalent process variants made using the content
of the specification and
drawings of this application, or directly or indirectly applied to other
related technologies, are included
in the scope of patent protection of this application.
17
Date Recue/Date Received 2022-01-05
