Note: Descriptions are shown in the official language in which they were submitted.
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Tower-Type Double-Chain Belt Pumping Unit
The present application claims the priorities of Chinese Utility Model Patent
Application No. 201120292730.5, entitled "Tackle Assembly" filed to China's
State
Intellectual Property Office on August 12, 2011 and international application
No.
PCT/CN2012/075397, entitled "Tower-Type Double-Chain Belt Pumping Unit" filed
on
May 11, 2012, the entire disclosures of which are incorporated herein by
reference.
Technical field of the invention
The invention relates to a pumping unit for oil extraction in an oil field,
and in
particular to a tower-type double-chain belt pumping unit.
Background of the invention
A belt pumping unit is an oil extraction equipment on-ground with low pumping
speed, long stroke and heavy load, which can meet the requirements of oil
wells in
various operation conditions, has the features of high efficiency, safety,
reliability and
energy saving, and is widely used in the country and the world.
The belt pumping unit includes a base, a rack erected on the base, a loading
belt
supported on a roller on the top of the rack, a balance box connected with the
inside
end of the loading belt, a rope hanger connected with the outside end of the
loading
belt, a chain driving mechanism for driving the balance box, and a motor and a
reducer for driving the chain driving mechanism.
Compared to single group of chain driving mechanism, double groups of chain
driving mechanisms have the features of the resultant force of driving forces
and the
load force being in the same direction, and further have the features of low
working
noise, small power consumption, and uniform load of the loading belt along the
width
direction of the belt. However, the loading belt is a reciprocating flexible
load-bearing
member, susceptible to wind load.
Summary of the invention
An object of the invention is to provide a tower-type double-chain belt
pumping
unit, which is exerted with uniform force, operates smoothly, can eliminate
the
influence of wind load during work and can prolong the service life of the
loading belt.
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To this end, the invention provides a tower-type double-chain belt pumping
unit,
comprising a tower bracket, wherein the top of the tower bracket is provided
with a
first belt roller and a second belt roller spaced in parallel apart from each
other, one
side of the tower bracket where the second belt roller is located is provided
with an
erect device cabin, and the side of the tower bracket where the first belt
roller is
located is provided with a vertically extending windproof guide rail; and a
reciprocating loading belt, spanning over the first belt roller and the second
belt roller,
and comprising an inside end located in the device cabin of the tower bracket
and an
outside end extending outside the tower bracket, wherein the outside end is
provided
with a rope hanger for connecting a pumping rod, and the rope hanger is
provided
with a guide wheel mated with the windproof guide rail, wherein a balance box
connected with the inside end of the loading belt and a first chain driving
mechanism
and a second chain driving mechanism for driving the lifting movement of the
balance
box are arranged in the device cabin.
Furthermore, the balance box comprises a counterweight portion connected with
the inside end of the loading belt, a driving sliding seat located below the
counterweight portion, a first guiding wheel group arranged on the left and
right sides
of the counterweight portion for limiting left-right swinging, and a second
guiding
wheel group arranged on the left and right sides of the counterweight portion
for
limiting forward-backward swinging, wherein a first tackle synchronously
movably
connected with a chain of the first chain driving mechanism and a second
tackle
synchronously movably connected with a chain of the second chain driving
mechanism are arranged in the driving sliding seat.
Furthermore, each guiding wheel of the first guiding wheel group and of the
second guiding wheel group is adjustable relative to the position of guide
contact
surface thereof.
Furthermore, the counterweight portion comprises a plurality of counterweight
grooves arranged in parallel for accommodating counterweights, each
counterweight
groove extending along a vertical direction.
Furthermore, a climbing ladder is arranged to the tower bracket on at least
one
of both sides of the loading belt.
Furthermore, the tower bracket is provided with multiple layers of maintenance
platforms.
Furthermore, the tower bracket comprises a base, upright columns arranged in
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rectangular form on the base and cross beams arranged between the upright
columns, crosswise webs are arranged between the upright columns on the side
of
the tower bracket on one side of the first belt roller, and the windproof
guide rail is
supported on the cross beams and the webs.
Furthermore, each of the first tackle and the second tackle comprises a tackle
body, a driving shaft freely rotatably supported in a tapered hole cavity of
the tackle
body, a chain link on one side of the driving shaft, a first group of rolling
wheels and a
second group of rolling wheels horizontally arranged above the driving shaft,
a third
group of rolling wheels and a fourth group of rolling wheels horizontally
arranged
below the driving shaft.
Furthermore, both a supporting shaft of the first group of rolling wheels and
a
supporting shaft of the second group of rolling wheels are eccentric shafts
with
rotational positions adjustable, and the first group of rolling wheels and the
second
group of rolling wheels abut to the guide rail in the driving sliding seat.
Furthermore, the first chain driving mechanism and the second chain driving
mechanism are simultaneously in a driving manner connected with the same
reducer
arranged on the base outside the device cabin, and the reducer is in a
transmission
manner connected with a motor arranged on a motor platform, wherein the motor
platform is located above the base and spaced apart from the base.
Compared to single belt roller in the prior art, the pumping unit of the
invention
reduces the bending degree in a unit of length for the loading belt, and
prolongs the
service life of the belt, by providing the first belt roller and the second
belt roller. In a
windy environment, the loading belt is prone to swinging due to its windward
area,
and the pumping rod also swings along with it, which is really detrimental to
oil
pumping facilities. By providing the four-column tower-type structure, the
windproof
guide rail and the guide wheel, the influence of wind load during pumping can
be
avoided, and the reliability of the device can be increased.
In addition to the objects, features and advantages as described above, other
objects, features and advantages of the invention will be further described in
conjunction with the accompanying drawings.
Brief description of the drawings
The accompanying drawings, which constitute a part of this specification and
provide a further understanding of the invention, illustrate preferred
embodiments of
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the invention, and serve to explain the principles of the invention together
with the
specification. In the drawings:
Fig. 1 is a side schematic view of a tower-type double-chain belt pumping unit
according to the invention;
Fig. 2 is a front schematic view of the tower-type double-chain belt pumping
unit
according to the invention;
Fig. 3 is a side schematic view of the tower-type double-chain belt pumping
unit
according to the invention, illustrating chain driving mechanisms and a
balance box in
a device cabin;
Fig. 4 is a side schematic view of the tower-type double-chain belt pumping
unit
according to the invention, illustrating that the balance box is located in
the lowest
position and in the highest position;
Fig. 5 is a schematic view of a driving mode of the tower-type double-chain
belt
pumping unit according to the invention;
Fig. 6 is a front schematic view of the balance box according to the
invention;
Fig. 7 is a side schematic view of the balance box according to the invention;
Fig. 8 is a schematic view of connection relationship between a tackle of the
balance box and said chain according to the invention;
Fig. 9 is a front schematic view of the tackle of the balance box according to
the
invention;
Fig. 10 is a top schematic view of the tackle of the balance box according to
the
invention;
Fig. 11 is a schematic plan view of a loading belt according to the invention;
Fig. 12 is a structural schematic view of the loading belt according to the
invention; and
Fig. 13 is a structural schematic view of a brake system according to the
invention.
List of reference signs
tower bracket 11 base
12 upright column 13 cross beam
14 first belt roller 15 second belt roller
16 device cabin 17 windproof guide rail
18_ motor platform 20 loading belt
21 inside end 22 outside end
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23 guide wheel 24 hinge support
25 bolt 26 rope hanger
30 balance box 40 first chain driving mechanism
40' second chain driving mechanism
50 reducer 60 motor
70 brake system 71 brake disc
72 first brake caliper 73 second brake caliper
74 manual regulation rod 75 automatic regulation rod
101 maintenance platform 102 climbing ladder
103 web 41 lower sprocket
42 upper sprocket 43 annular chain
44 supporting seat 31 counterweight portion
32 driving sliding seat 33 first guiding wheel group
34 second guiding wheel group 321 sliding cavity
35 first tackle 36 second tackle
311 counterweight groove 37 position adjustment mechanism
351 tackle body , 352 tapered hole cavity
353 driving shaft 354 chain link
355 first group of rolling wheels 356 second group of rolling wheels
357 third group of rolling wheels 358 fourth group of rolling wheels
351a elastic clip holder 359 eccentric shaft
Detailed description of the invention
The invention is described in detail below in conjunction with the
accompanying
drawings, however the invention can be embodied in various ways defined and
encompassed by claims.
Figs.1 to 5 are structural schematic views of a belt pumping unit according to
an
embodiment of the invention. Referring to Fig. 1 and Fig. 5, the tower-type
double-chain belt pumping unit of the invention includes: a tower bracket 10,
including a base 11, upright columns 12 arranged in rectangular form on the
base 11
and cross beams 13 connected between the upright columns 12, the top of the
tower
bracket 10 is provided with a first belt roller 14 and a second belt roller 15
spaced in
parallel apart from each other, one side of the tower bracket 10 where the
second
belt roller 15 is located is provided with an erect device cabin 16, and the
side of the
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tower bracket where the first belt roller 14 is located is provided with a
vertically
extending windproof guide rail 17; and a loading belt 20, spanning over the
first belt
roller 14 and the second belt roller 15, and including an inside end 21
located in the
device cabin 16 of the tower bracket 10 and an outside end 22 extending
outside the
tower bracket 10, wherein the outside end 22 forms a rope hanger, which is
provided
with a guide wheel 23 mated with the windproof guide rail 17, wherein a
balance box
30 connected with the inside end 21 of the loading belt 20, and a first chain
driving
mechanism 40 and a second chain driving mechanism 40' for driving the lifting
movement of the balance box 30 are arranged in the device cabin 16.
Compared to single belt roller in the prior art, the pumping unit of the
invention
reduces the bending degree in a unit of length, and prolongs the service life
of the
belt, by providing the first belt roller and the second belt roller. In a
windy environment,
the loading belt is prone to swinging due to a certain windward area thereof,
and the
pumping rod also swings along with it, which is really detrimental to pumping
facilities.
By arranging the windproof guide rail and the guide wheel, the influence of
wind load
during pumping can be avoided, and the reliability of the device can be
increased. In
the existing belt pumping unit, the rack is only provided with the device
cabin, without
other parts, so the tower bracket mentioned in the invention cannot be formed,
and it
is not convenient for use and maintenance. In the invention, the tower bracket
adopted has reliable structure as well as easy use and maintenance.
Compared to single chain transmission in the prior art, the pumping unit of
the
invention has more reasonably force exerted thereon, operates more smoothly,
prolongs the service life of the device and reduces noise. With the four-
column
tower-type structure, the stability and reliability of the device can be
improved greatly.
The tower-type double-chain belt pumping unit of the invention also includes a
reducer 50 arranged on the base 11 outside the device cabin 16 and a motor 60
arranged on a motor platform 18 and connected with the reducer 50 in a
transmission
manner, wherein the motor platform 18 is distanced from the base 11, with belt
transmission therebetween.
The tower-type double-chain belt pumping unit of the invention also includes a
brake system 70, as shown in Fig. 13. The brake system 70 includes a brake
disc 71,
a first brake caliper 72 and a second brake caliper 73 arranged on the outer
perimeter of the brake disc 71. The first brake caliper 72 is operated by a
manual
regulation rod 74 to realize the function of manual braking, and the second
brake
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caliper 73 is operated by an automatic regulation rod 75 to conform to the
occasion
that automatic braking is required due to excess and deficiency of speed of
the
reducer.
In the above, the tower bracket 10 is provided with multiple layers of
maintenance platforms 101, and a climbing ladder 102 is arranged to the tower
bracket 10, on at least one of both sides of the loading belt.
In the above, crosswise webs 103 are arranged between the upright columns on
the side of the tower bracket where the first belt roller 14 is located, and
the
windproof guide rail 17 is supported on the cross beams 13 and the webs 103.
In the above, the first chain driving mechanism 40 includes a lower sprocket
41,
an upper sprocket 42 and an annular chain 43. The upper sprocket 42 is
supported
on a sprocket supporting seat 44. It should be noted that the positions of the
upper
sprocket and the lower sprocket of the first chain driving mechanism are fixed
and
only the chain is annularly rotatable. Preferably, a rotatable tensioner is
connected
between each of the lower sprocket 41 and an output shaft of the reducer 50 to
realize the requirement for simultaneous installation of the first chain
driving
mechanism 40 and the first chain driving mechanism 40'.
Fig. 6 and Fig. 7 are structural schematic views of a balance box according to
the invention. As shown in Fig. 6 and Fig. 7, the balance box 30 includes a
counterweight portion 31 connected with the inside end of the loading belt 20,
a
driving sliding seat 32 located below the counterweight portion 31, a first
guiding
wheel group 33 arranged on the left and right sides of the counterweight
portion 31
for limiting left-right swinging, and a second guiding wheel group 34 arranged
on the
left and right sides of the counterweight portion 31 for limiting forward-
backward
swinging, wherein a first tackle 35 synchronously movably connected with a
chain of
the first chain driving mechanism 40 and a second tackle 36 synchronously
movably
connected with a chain of the second chain driving mechanism 40' are arranged
in a
sliding cavity 321 of the driving sliding seat 32.
In the above, the first guiding wheel group 33 includes guiding wheels
respectively arranged on the top left, bottom left, top right and bottom right
positions.
The second guiding wheel group 34 includes guiding wheels respectively
arranged
on the top left, bottom left, top right and bottom right positions. There are
two guiding
wheels on each position of the second guiding wheel group 34, arranged along
the
forward and backward direction, one limiting forward swinging, and the other
limiting
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backward swinging.
Preferably, each guiding wheel of the first guiding wheel group 33 and the
second guiding wheel group 34 is adjustable relative to the position of guide
contact
surface thereof. Specific methods may be as follows: the guiding wheel is
installed on
a swing arm, and the position of the guiding wheel is adjusted by regulating
the
swinging angle of the swing arm.
Preferably, the counterweight portion 31 includes a plurality of counterweight
grooves 311 arranged in parallel for accommodating counterweights, each
counterweight groove 311 extending along a vertical direction. The height of
the
counterweight portion 31 is 3 to 5 times of the height of the driving sliding
seating 32.
The bottom of the device cabin 16 is provided with a position adjustment
mechanism
37 of the balance box 30.
Also as shown in Fig. 5 and Fig. 8, the first chain driving mechanism 40 and
the
second chain driving mechanism 40' are also located in the device cabin, in
the front
of the counterweight portion 31, synchronously driven by the same reducer, and
the
chain transmission and the speed of the first chain driving mechanism 40 and
the
second chain driving mechanism 40' are totally identical.
Fig. 9 and Fig. 10 are structural schematic views of the tackle of the balance
box
according to the invention. As shown in Fig. 9 and Fig. 10, the tackle 35 (the
structure
of the tackle 36 is the same as that of the tackle 35) includes a tackle body
351, a
driving shaft 353 freely rotatably supported in a tapered hole cavity 352 of
the tackle
body 351, a chain link 354 on one side of the driving shaft 353, a first group
of rolling
wheels 355 and a second group of rolling wheels 356 horizontally arranged on
the
upper part of the tackle body 351, a third group of rolling wheels 357 and a
fourth
group of rolling wheels 358 horizontally arranged on the lower part of the
tackle body
351.
In use, the first group of rolling wheels 355, the second group of rolling
wheels
356, the third group of rolling wheels 357 and the fourth group of rolling
wheels 358
respectively come into contact with sliding rails in the sliding cavity 321 of
the sliding
seat 32, and in such a way, the first tackle and the second tackle only move
in a
horizontal direction.
A supporting shaft 359 of the first group of rolling wheels 355 is an
eccentric
shaft adjustable in the position. The supporting shaft 359 is clamped and
fixed by an
elastic clip holder 351a of the tackle body 351. During commissioning, the
eccentric
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shaft 359 rotates by loosening the bolt on the elastic clip holder 351a, so
that the first
group of rolling wheels 355 are clung and in contact to the guide rail in the
sliding
cavity 321 to realize the tensioning function. The structure of the supporting
shaft of
the second group of rolling wheels 356 is the same as that of the supporting
shaft of
the first group of rolling wheels 355, achieving the function of making the
rolling
wheel self-tension the guide rail.
Fig. 11 and Fig. 12 are structural schematic views of the loading belt
according
to the invention. As shown in Fig. 11 and Fig. 12, the inside end 21 of the
loading belt
20 is fixedly connected with a hinge support 24 through a plurality of bolts
25, the end
of each bolt 25 is tapered to avoid reducing its connection strength due to
belt fibre
breakage during knocking into the belt. The outside end 22 of the loading belt
20 is
fixedly connected with the rope hanger 26 through a plurality of bolts, the
inner side
of the rope hanger 26 forms the guide wheel 23, and the end of each bolt is
also
tapered to avoid reducing its strength due to belt fibre breakage.
The above is only the preferred embodiment of the invention and not intended
to
limit the invention. For those skilled in the art, various changes and
variations can be
made to the invention. Any modifications, equivalent replacements,
improvements
and the like within the spirit and principle of the invention shall fall
within the scope of
protection of the invention.
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