Note: Descriptions are shown in the official language in which they were submitted.
,
TAIL ROPE MONITORING DEVICE OF MINE HOISTING SYSTEM
BACKGROUND OF THE INVENTION
Field of the Invention
The present invention relates to a mine hoisting system, and in particular, to
a
device for monitoring a tail rope of a mine hoisting system.
Description of Related Art
A tail rope is an important part of a mine hoisting system, such as a multi-
rope
friction wheel hoisting system of a coal mine shaft. Two ends of the tail end
are
respectively connected to the bottoms of two hoisting containers such as an
auxiliary
shaft cage or a main shaft skip, and the tail end is suspended below the two
hoisting
containers to form an annular operating system consisting of a hoisting rope,
a
hoisting container, a tail rope, a hoisting container and a hoisting rope. The
tail
rope plays a balancing effect in the hoisting system. The tail rope is rotated
to release
the stress when the hoisting containers are raised or lowered. However, in
actual use,
the tail rope often is hindered in rotation or damaged, which affects the
operation of
the hoisting system.
SUMMARY OF THE INVENTION
Technical Problem
In view of the above, embodiments of the present invention are intended to
provide a device for monitoring a tail rope of a mine hoisting system, which
can
monitor the working state of a tail rope in real time.
1
Date Recue/Date Received 2020-08-21
Technical Solution
To achieve the foregoing objective, the technical solution of the present
invention
is implemented as follows:
An embodiment of the present invention provides a device for monitoring a tail
rope of a mine hoisting system, comprising an upper suspension rod, a lower
suspension
rod, a processing component, and at least two sensors, wherein the at least
two sensors
are connected to the processing component; the at least two sensors are
peripherally
spaced at a preset angle, and fixed to the upper suspension rod, with sensing
heads
facing towards the lower suspension rod; and the lower suspension rod is
configured to
hang a tail rope and rotatably connected to the upper suspension rod;
each of the at least two sensors transmits a first signal to the processing
component
when a component to be sensed of the lower suspension rod is sensed for the
first time;
each of the at least two sensors transmits a second signal to the processing
component when the component to be sensed of the lower suspension rod is
sensed for
the second time; and
the processing component calculates rotation data of the tail rope based on a
position of each of the at least two sensors, a time point at which the
component to be
sensed of the lower suspension rod is sensed by each of the at least two
sensors for the
first time, and a time point at which the component to be sensed of the lower
suspension
rod is sensed by each of the at least two sensors for the second time, wherein
the first
sensing and the second sensing are adjacent or non-adjacent sensing.
In the foregoing solution, the component to be sensed is at a preset distance
from
the sensor, and there is one or more components to be sensed.
In the foregoing solution, the lower suspension rod is connected to the upper
suspension rod via a connecting sleeve; an upper end of the connecting sleeve
is
rotatably connected to the upper suspension rod, and a lower end of the
connecting
sleeve is fixed to an upper end of the lower suspension rod.
In the foregoing solution, at least one rolling bearing is disposed in an
inner cavity
of the connecting sleeve; the rolling bearing comprises an inner ring fixed to
a lower
end of the upper suspension rod and an outer ring rotating relative to the
inner ring; and
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the outer ring is fixed to the inner cavity of the connecting sleeve.
In the foregoing solution, the device for monitoring the tail rope is further
provided
with a monitoring component mounting bracket; the monitoring component
mounting
bracket is annular with an upper end fixed to the upper suspension rod and a
lower end
sleeved on the connecting sleeve; and the sensor is disposed on the lower end
of the
monitoring component mounting bracket.
In the foregoing solution, the sensor is a Hall sensor, and the component to
be
sensed comprises a magnetic element that can be sensed by the Hall sensor; and
the
component to be sensed is disposed on the connecting sleeve.
In the foregoing solution, the device for monitoring the tail rope is further
provided
with a signal acquisition component; one end of the signal acquisition
component is
connected to the sensor, and the other end of the signal acquisition component
is
connected to the processing component; and the signal acquisition component
acquires
a sensing signal of the sensor to be transmitted to the processing component.
In the foregoing solution, the processing component is further provided with a
memory and a display; the memory is configured to store the sensing signal
received
by the processing component and data processed by the processing component,
and the
display is configured to display the data processed by the processing
component.
In the foregoing solution, the device for monitoring a tail rope is further
provided
with a wireless transmitter and a wireless receiver; the wireless transmitter
is connected
to the signal acquisition component, and the wireless receiver is connected to
the
processing component; the wireless transmitter is configured to transmit the
sensing
signal acquired by the signal acquisition component, and the wireless receiver
is
configured to receive the sensing signal and transfer same to the processing
component.
In the foregoing solution, the signal acquisition component is a single chip
microcomputer, and the processing component is an industrial computer.
Advantageous Effect
The device for monitoring the tail rope of the mine hoisting system provided
in the
embodiment of the present invention includes an upper suspension rod, a lower
suspension rod, a processing component, and at least two sensors, wherein the
at least
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two sensors are connected to the processing component; the at least two
sensors are
peripherally spaced at a preset angle, and fixed to the upper suspension rod,
with
sensing heads facing towards the lower suspension rod; and the lower
suspension rod
is configured to hang a tail rope and rotatably connected to the upper
suspension rod.
In this way, the device for monitoring the tail rope of the mine hoisting
system provided
in the embodiment of the present invention can monitor the working state of
the tail
rope in real time, so that the mine hoisting system is controlled or adjusted
based on the
working state of the tail rope, and thus is safer.
Other advantageous effects of the embodiments of the present invention will be
further described in the Detailed Description with reference to specific
technical
solutions.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram showing transmission of a monitoring signal in a
device for monitoring a tail rope of a mine hoisting system according to an
embodiment
of the present invention;
FIG. 2 is a schematic diagram of a tail rope suspension device in a device for
monitoring a tail rope of a mine hoisting system according to an embodiment of
the
present invention;
FIG. 3 is a left view of FIG. 2;
FIG. 4 is a schematic diagram of a monitoring component mounting bracket in a
device for monitoring a tail rope of a mine hoisting system according to an
embodiment
of the present invention;
FIG. 5 is a schematic diagram showing a device for monitoring a tail rope of a
mine
hoisting system according to an embodiment of the present invention when used
in the
mine hoisting system;
FIG. 6 is a schematic diagram showing communication of a wireless transmitter
and a wireless receiver in a device for monitoring a tail rope of a mine
hoisting system
according to an embodiment of the present invention; and
FIG. 7 is a schematic flowchart of a device for monitoring a tail rope of a
mine
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hoisting system according to an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention provides a device for monitoring a tail
rope of a mine hoisting system, comprising an upper suspension rod, a lower
suspension
rod, a processing component, and at least two sensors, wherein the at least
two sensors
are connected to the processing component; the at least two sensors are
peripherally
spaced at a preset angle, and fixed to the upper suspension rod, with sensing
heads
facing towards the lower suspension rod; and the lower suspension rod is
configured to
hang a tail rope and rotatably connected to the upper suspension rod;
each of the at least two sensors transmits a first signal to the processing
component
when a component to be sensed of the lower suspension rod is sensed for the
first time;
each of the at least two sensors transmits a second signal to the processing
component when the component to be sensed of the lower suspension rod is
sensed for
the second time; and
the processing component calculates rotation data of the tail rope based on a
position of each of the at least two sensors, a time point at which the
component to be
sensed of the lower suspension rod is sensed by each of the at least two
sensors for the
first time, and a time point at which the component to be sensed of the lower
suspension
rod is sensed by each of the at least two sensors for the second time, wherein
the first
sensing and the second sensing are adjacent or non-adjacent sensing. The word
"adjacent" can be understood as the number of turn adjacent to the number of
turn
detected for the first time, and correspondingly, the word "non-adjacent" is
the number
of turn not adjacent to the number of turn detected for the first time,
wherein the number
of turn detected for the first time can be any number of turn. For example, if
during the
monitoring process, the tail rope is turned 10 times, then the sensing of the
second turn
can be used as the first sensing, and the sensing of the third turn as the
second sensing;
or the sensing of the first turn can be used as the first sensing, and the
sensing of the
fifth turn as the second sensing.
The device for monitoring the tail rope of the mine hoisting system according
to
the embodiment of the present invention can monitor the working state of the
tail rope
CA 3065833 2019-12-20
in real time, so that the mine hoisting system is controlled or adjusted based
on the
working state of the tail rope, and thus is safer.
It should be noted that in the description of the embodiments of the present
invention, unless otherwise stated and limited, the term "connected" shall be
understood
in a broad sense, and for example, it may be comprehended as being
electrically
connected, in an internal communication between two elements, directly
connected, or
indirectly connected via an intermediate medium. Specific meaning about the
term may
be understood by a person of ordinary skill in the art according to specific
circumstances.
It should be noted that the terms "first/second/third" involved in the
embodiments
of the present invention are only intended to distinguish similar objects,
rather than
representing the particular order of the objects. It should be understood that
the
particular sequence or precedence order of the terms "first/second/third" can
be
interchanged if allowed. It should be understood that the objects
distinguished by the
terms "first\second \third" can be interchanged where appropriate, so that the
embodiments of the present invention described herein can be carried out in a
sequence
other than those illustrated or described herein.
In the embodiments of the present invention, except the processing component
that
can be disposed at a working site of the mine hoisting system or in a machine
room
away from the mine hoisting system, other components in the device for
monitoring the
tail rope need to be hung below a hoisting container of the mine hoisting
system and
connected to each other, and therefore can be collectively referred to as a
tail rope
suspension device, that is, the upper and lower suspension rods are part of
the tail rope
suspension device. It can be understood that in some embodiments of the
present
invention, the processing component may be directly mounted on the tail rope
suspension device.
In the embodiments of the present invention, the rotation data of the tail
rope
includes rotation speed, rotation acceleration, rotation direction, rotation
acceleration
time, rotation deceleration time, tail rope rotation start position, and tail
rope rotation
stop position, wherein the rotation direction includes the clockwise direction
and the
counterclockwise direction; the connection of the sensor to the processing
component
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may be a wired connection or a wireless connection, preferably a wireless
connection,
because the processing component is generally disposed in the machine room
away
from the working site.
Further, the working start time, the working stop time, etc. of the mine
hoisting
system can be obtained from the rotation data of the tail rope. Whether the
working
state of the tail rope is normal can be inferred from the rotation data of the
tail rope, and
then the mine hoisting system is controlled or adjusted based on the working
state of
the tail rope. Control or adjustment of the mine hoisting system may be
carried out by
a control device of the mine hoisting system, and may also be independently
set by the
device for monitoring the tail rope of the embodiment of the present
invention, and
preferably is carried out by the control device of the mine hoisting system.
As an implementation mode, the component to be sensed is at a preset distance
from the sensor, and there is one or more components to be sensed. The more
the
components to be sensed are set, the more accurate the rotation data of the
tail rope is,
and it is easier to know the rotation start position of the tail rope and the
rotation stop
position of the tail rope, namely, from the start of rotation to the stop of
rotation. The
tail rope does not rotate in an integer number of turns. The preset distance
may be set
according to the acquisition distance of the sensor.
As an implementation mode, the lower suspension rod may be connected to the
upper suspension rod via a connecting sleeve; an upper end of the connecting
sleeve is
rotatably connected to the upper suspension rod, and a lower end of the
connecting
sleeve is fixed to an upper end of the lower suspension rod.
As an implementation mode, at least one rolling bearing is disposed in an
inner
cavity of the connecting sleeve; the rolling bearing includes an inner ring
fixed to a
lower end of the upper suspension rod and an outer ring rotating relative to
the inner
ring; and the outer ring is fixed to the inner cavity of the connecting
sleeve. Connecting
the upper suspension rod to the lower suspension rod via the connecting sleeve
contributes to simplify the complexity of parts, making the processing easier,
and it is
only necessary to replace some parts if damaged, rather than replacing all the
parts. It
can be understood that the upper suspension rod and the lower suspension rod
may also
be directly connected, that is, the connecting sleeve may be integrally formed
on the
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lower suspension rod.
As an implementation mode, the device for monitoring the tail rope is further
provided with a monitoring component mounting bracket; the monitoring
component
mounting bracket is annular with an upper end fixed to the upper suspension
rod and a
lower end sleeved on the connecting sleeve; and the sensor is disposed on the
lower end
of the monitoring component mounting bracket. The purpose of disposing the
monitoring component mounting bracket is to facilitate mounting the sensor.
As an implementation mode, the sensor may be a Hall sensor; the component to
be
sensed includes a magnetic element that can be sensed by the Hall sensor, and
the
magnetic element may be a permanent magnet block; when the lower suspension
rod is
connected to the upper suspension rod via the connecting sleeve, the component
to be
sensed may be disposed on the connecting sleeve or may also be fixed to the
lower
suspension rod, so long as the component to be sensed can rotate with the
rotation of
the lower suspension rod. Compared with an optical sensor, the Hall sensor is
less
susceptible to contamination and is more stable.
As an implementation mode, the device for monitoring the tail rope is further
provided with a signal acquisition component; one end of the signal
acquisition
component is connected to the sensor, and the other end of the signal
acquisition
component is connected to the processing component; and the signal acquisition
component acquires a sensing signal of the sensor to be transmitted to the
processing
component. The sensing signal is the first signal or second signal. In this
way, the
sensing signal of the sensor can be obtained and analyzed. The connection
between the
signal acquisition component and the sensor can be a wired connection, or a
wireless
connection, preferably a wired connection, because the signal acquisition
component is
generally disposed at the working site, the wired connection is more reliable
and simple.
The connection between the signal acquisition component and the processing
component can be a wired connection, or a wireless connection, preferably a
wireless
connection, because the processing component is generally disposed in a
machine room
away from working site. It can be understood that the signal acquisition
component and
the processing component may be integrated together when the processing
component
is directly disposed on the tail rope suspension device, that is, when the
processing
component is disposed at the working site of the mine hoisting system.
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As an implementation mode, the processing component is further provided with a
memory and a display; the memory is configured to store the sensing signal
received
by the processing component and data processed by the processing component,
and the
display is configured to display the data processed by the processing
component. The
rotation data stored in the memory may be consulted or further analyzed as
needed, and
the display may display the rotation data more intuitively. The display may
also be
configured to display in real time the information sent by the signal
acquisition
component, i.e., the rotation of the tail rope.
As an implementation mode, the device for monitoring the tail rope is further
provided with a wireless transmitter and a wireless receiver. The wireless
transmitter is
connected to the signal acquisition component, and the wireless receiver is
connected
to the processing component. The connection of the wireless transmitter and
the signal
acquisition component is a wired connection, because the wireless transmitter
and the
signal acquisition component are generally disposed at the same place, and
similarly,
the connection of the wireless receiver and the processing component is also a
wired
connection. The wireless transmitter is configured to transmit the sensing
signal
acquired by the signal acquisition component, and the wireless receiver is
configured
to receive the sensing signal and transfer same to the processing component.
In this way,
the processing component needs not to be placed on site, for example may be
placed in
an office located a few kilometers away from the site, so that the processing
component
is well protected. More specifically, the wireless transmitter and the
wireless receiver
may communicate with each other via digital microwaves.
As an implementation mode, the signal acquisition component may be a single
chip
microcomputer, and the processing component may be an industrial computer.
More
specifically, the single chip microcomputer may be a Micro Controller Unit
(MCU),
and the single chip microcomputer performs preliminary processing after
acquiring the
sensing signal of the sensor, and the processed signal is sent to the
processing
component. The single chip microcomputer is widely used and convenient in
programming, and the industrial computer is stable in the performance.
The present invention will be further described in detail below with reference
to
specific embodiments. It should be understood that the specific embodiments
described
herein are merely illustrative of the present invention and are not intended
to limit the
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present invention.
FIG. 1 is a schematic diagram showing transmission of a monitoring signal in a
device for monitoring a tail rope of a mine hoisting system according to an
embodiment
of the present invention. As shown in FIG. 1, the process of transferring the
monitoring
signal in the device for monitoring the tail rope of the mine hoisting system
is that: the
monitoring signal is sequentially transferred to the Hall sensor, the MCU, a
wireless
transmitting module, a wireless receiving module, and the industrial computer.
The Hall sensor is configured to monitor the rotation condition of the tail
rope,
such as whether the tail rope rotates, what is the rotation speed, etc. There
are two Hall
sensors, i.e., a Hall sensor I and a Hall sensor II. In this way, the MCU can
obtain
whether the tail rope rotates clockwise or counterclockwise via the sensing
signals of
the two Hall sensors. Correspondingly, there are two or more magnetic elements
as the
components to be sensed. In this way, in addition to the rotation turns of the
tail rope,
it can accurate to a half turn or an angle less than a half turn.
The MCU is configured to acquire a pulse signal output by the Hall sensor, and
preliminarily process the pulse signal and then forward to the industrial
computer. The
Hall sensor outputs a pulse signal to the MCU when the tail rope rotates. The
preliminary processing may include determining a working start time or stop
time of
the mine hoisting system, that is, determining that the mine hoisting system
starts to
work or stops when the tail rope starts to rotate or stops rotating, and may
also include
monitoring the rotation state of the tail rope, the rotation state of the tail
rope including
whether to rotate, the rotation direction, etc.
The wireless transmitter is configured to modulate a signal sent by the MCU to
the
industrial computer into a wireless signal for transmission.
The wireless receiver is configured to receive the wireless signal, and
demodulate
the signal sent by the MCU to the industrial computer, and transfer the same
to the
industrial computer.
The industrial computer is configured to process the signal from the MCU. The
processing may include: based on the preliminary processing of the MCU,
further
determining the working start time or stop time of the mine hoisting system,
the rotation
CA 3065833 2019-12-20
state and rotation direction of the tail rope, the rotation speed of the tail
rope, the rotation
acceleration of the tail rope, etc.; and on this basis, drawing a tail rope
rotation curve,
making a tail rope rotation simulated animation, etc., and determining the
working state
of the tail rope, see the description below for details.
After obtaining the working state of the tail rope, the industrial computer
further
sends the working state to the control device of the mine hoisting system to
facilitate
controlling or adjusting the mine hoisting system.
In addition, the device for monitoring the tail rope of the mine hoisting
system
further includes a high-energy battery; the high-energy battery is configured
to power
the Hall sensor, the MCU, and the wireless transmitter, because the three
components
are disposed at the working site away from the machine room, and have no
electric
supply.
The industrial computer is installed with monitoring, diagnosis and analysis
software. The monitoring, diagnosis and analysis software can process the data
sent by
the MCU, and can also realize data browsing, tail rope rotation curve drawing,
tail rope
rotation simulated animation, historical data query, fault diagnosis and
alarm, and other
functions, as described below.
(1) Tail rope rotation curve drawing
A chart can be drawn according to the rotation data. The abscissa of the chart
is the
system time, and the ordinate indicates the number of rotations. The clockwise
rotation
is the positive direction by default, and the counterclockwise rotation is the
negative
direction. The hoisting start time and end time are divided by a vertical red
line on the
time axis. The judgment is based on the fact that the tail rope stops rotating
when the
mine hoisting system is stationary. In this case, the signal output by the
Hall sensor
does not change for a long time, that is, does not change within the set time
duration.
After the mine hoisting system starts to operate, the tail rope starts to
rotate, and the
Hall sensor outputs a pulse signal. A signal period is reduced at the time
corresponding
to the change of the signal, and the mine hoisting system starts to operate by
default.
The tail rope is stationary after the hoisting is finished. In this case, the
time duration
of a signal period is increased at the time corresponding to the last change
of the signal,
and it is considered that the time is the hoisting stop time and is marked
with a vertical
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red line.
(2) Tail rope rotation simulated animation
A simulated animation of the tail rope suspension device is displayed in the
middle
of a monitoring interface, and the rotation of the tail rope suspension device
during the
operation of the mine hoisting system can be simulated with an animation.
(3) Tail rope rotation stop alarm
If the signal output by the Hall sensor stops changing and the hoisting end
time is
not reached, it is considered that at this time, the tail rope stops rotating
or the rotation
angle is too small, and in this case, a first-level alarm is issued, and a
rotation stop
indicator turns red. If the hoisting end time is not reached after the
specified time and
the signal does not change, it is considered that the tail rope suspension
device has
failed. In this case, a second-level alarm is issued, and the rotation stop
indicator starts
to flash and a continuous alarm is sounded.
(4) Tail rope rotation data abnormality alarm
The tail rope rotation stop fault is a gradual fault. The tail rope rotation
curves
obtained by each operation of the mine hoisting system are compared, and the
curve
monitored for the first hoisting is considered to be an initial curve. If the
monitored
rotation curve is significantly different from the initial curve, it is
considered that the
health degree of the tail rope suspension device is reduced. If the difference
between
the monitored rotation curve and the initial curve is greater than 30%, a tail
rope rotation
abnormality indicator turns red and an alarm is issued.
(5) Alarm record query
The monitoring, diagnosis and analysis software automatically records the
alarm
information into an alarm database each time the foregoing alarm occurs. The
"Alarm
Record" button on the right side of the monitoring, diagnosis and analysis
software may
be clicked on to view the alarm database.
The industrial computer is further configured to detect the electric quantity
of the
high-energy battery. A power indicator turns red when the electric quantity of
the high-
energy battery is less than 5%, and a continuous alarm is issued.
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FIG. 2 is a schematic diagram of a tail rope suspension device in a device for
monitoring a tail rope of a mine hoisting system according to an embodiment of
the
present invention. FIG. 3 is a left view of FIG. 2. As shown in FIGs. 2 and 3,
the tail
rope suspension device includes an axis pin 1, a connecting fork 2, an upper
suspension
rod 3, a monitoring component mounting bracket 4, a connecting sleeve 5, a
radial ball
bearing 6, a thrust ball bearing 7, a seal ring 8, a lower suspension rod 9,
and a sensor
11.
The upper suspension rod 3 is used to connect a hoisting container, and
specifically,
is fixed to the hoisting container via the axis pin 1 and the connecting fork
2. The upper
suspension rod 3 is fixed by the connecting fork 2 via bolts and nuts, the
connecting
fork 2 is fixed by the axis pin 1 via bolts and nuts, and the axis pin 1 is
fixed to the
hoisting container.
The connecting sleeve 5 is used to connect the upper suspension rod 3 and the
lower suspension rod 9. An inner cavity of the connecting sleeve 5 is provided
with the
radial ball bearing 6 at an upper end and the thrust ball bearing 7 at a lower
end. A
lower end of the upper suspension rod 3 penetrates into the inner cavity of
the
connecting sleeve 5, and is assembled with the radial ball bearing 6 and the
thrust ball
bearing 7, that is, an external bearing gear of the upper suspension rod 3
matches inner
rings of the radial ball bearing 6 and the thrust ball bearing 7. After the
assembly, the
connecting sleeve 5 can be rotated about the axis of the upper suspension rod
3 relative
to the upper suspension rod 3.
The lower suspension rod 9 is used to hang the tail rope. The lower suspension
rod
9 is fixed to the connecting sleeve 5 via bolts and nuts, and can rotate along
with the
connecting sleeve 5. One end of the seal ring 8 is fixed to the connecting
sleeve 5, and
the other end of the seal ring 8 is fixed to the lower suspension rod 9 and
sleeved at the
lower end of the upper suspension rod 3 to protect the thrust ball bearing 7
from dust
and enable good lubrication of the thrust ball bearing 7.
The sensor 11 is used to monitor the rotation of the lower suspension rod 9.
The
sensor 11 is fixed to the monitoring component mounting bracket 4. A lower end
of the
monitoring component mounting bracket 4 is sleeved on the connecting sleeve 5.
A
sensing head of the sensor 11 is fixed to an inner wall of the monitoring
component
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mounting frame 4, with the sensing direction being aligned with an outer wall
of the
connecting sleeve 5.
The sensor 11 is specifically a Hall sensor, and the connecting sleeve 5 is
provided
with a magnetic element matching the Hall sensor. In this embodiment, a
permanent
magnet block is disposed on a bolt fixed to the connecting sleeve 5. The
number of the
sensor 11 may be two. In addition to monitoring whether the lower suspension
rod 9 is
rotated, the sensors 11 also monitor whether the lower suspension rod 9 is
rotated
clockwise or counterclockwise. The number of the permanent magnet block may be
two or more. In this way, the rotation angle of the lower suspension rod 9 can
be
accurately obtained, because during the monitoring, the lower suspension rod 9
does
not always rotate for an integer of turns.
FIG. 4 is a schematic diagram of a monitoring component mounting bracket in a
device for monitoring a tail rope of a mine hoisting system according to an
embodiment
of the present invention. As shown in FIG. 4, the monitoring component
mounting
bracket includes a mounting bracket body 10. The mounting bracket body 10 is
mounted with a sensor 11. The sensor 11 includes a sensor A and a sensor B. To
facilitate installation to the upper suspension rod, the mounting bracket body
10
includes upper and lower blocks. The upper block of the mounting bracket body
10 is
mounted with an MCU 13, a wireless transmitter 14, and a power supply 12. For
use in
a coal mine or the like, the power supply 12 is an intrinsically safe power
supply. The
lower block of the mounting bracket body 10 may be sleeved on the connecting
sleeve
for mounting the sensor 11 thereon.
The wireless transmitter 14 is used to transmit a sensing signal of the sensor
11
acquired by the MCU 13. For the sake of transmission stability, the wireless
transmitter
14 transmits signals via digital microwave communication, and adopts an anti-
interference technique such as high-speed frequency hopping and forward error
correction.
FIG. 5 is a schematic diagram showing a device for monitoring a tail rope of a
mine
hoisting system according to an embodiment of the present invention when used
in the
mine hoisting system. As shown in FIG. 5, the mine hoisting system includes an
upper
sheave wheel, a lower sheave wheel, a drum, a hoisting container A, and a
hoisting
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container B. The tail rope suspension device 15 and the monitoring component
mounting bracket 16 of the device for monitoring the tail rope are located
below the
hoisting container A, and the wireless receiver 17 and the industrial computer
18 are
located on the ground near the mine, generally in a machine room.
Here, the tail rope suspension device 15 may be the tail rope suspension
device
shown in FIGs. 2 and 3, and the monitoring component mounting bracket 16 may
be
the monitoring component mounting bracket 4 shown in FIGs. 2 and 3.
The device for monitoring the tail rope is configured to monitor the rotation
of the
tail rope when the mine hoisting system operates, to avoid accumulation of
stress after
the tail rope is hindered in rotation or damaged, which affects the operation
of the mine
hoisting system.
FIG. 6 is a schematic diagram showing frequency hopping of wireless
transmission
in device for monitoring a tail rope of a mine hoisting system according to an
embodiment of the present invention. As shown in FIG. 6, baseband modulation,
generally Frequency-Shift Keying (FSK) modulation is performed on an input
signal at
a transmitting end, i.e., a wireless transmitter end, and then the modulated
signal is
mixed or frequency-converted with a local oscillator signal generated by a
frequency
synthesizer under the control of a Pseudorandom Noise (PN) code to obtain a
pseudorandom hopping radio-frequency signal. The local oscillator signal is a
radio-
frequency carrier signal and is obtained by inputting the PN code into the
frequency
synthesizer for variable frequency synthesis. A local frequency synthesizer is
controlled
by the same PN code as the transmitting end at a receiving end, i.e., a
wireless receiver
end, and the received signal is mixed with a signal of the local frequency
synthesizer to
obtain a baseband modulated signal, and then baseband demodulation is
performed to
restore the signal. It can be seen from the principle that the frequency
hopping
communication is instantaneous narrow-band communication. The bandwidth of the
occupied channel is very narrow during the dwell time of each frequency.
However,
since the rate of frequency hopping is relatively high, the frequency hopping
system is
also a broadband system from a macroscopic perspective, that is, the spectrum
is spread.
By setting the frequency modulation, the anti-interference capability of the
wireless
signal transmission is greatly improved.
CA 3065833 2019-12-20
FIG. 7 is a schematic flowchart of a device for monitoring a tail rope of a
mine
hoisting system according to an embodiment of the present invention. As shown
in FIG.
7, the working process includes the following steps:
Step 701: reading of a pulse signal.
The MCU reads the pulse signal from two Hall sensors, i.e., a sensing signal
of the
tail rope rotation.
Step 702: reading of a preset processing program.
The MCU reads a built-in preset processing program, and performs preliminary
processing, i.e., step 703 and step 704, on the pulse signal obtained from the
Hall sensor.
Step 703: determination of the hoisting start time.
The MCU determines, based on the preliminary processing, the working start
time
of the mine hoisting system.
Step 704: monitoring of the rotation state of a tail rope.
The MCU determines, based on the preliminary processing, the rotation state of
the tail rope, specifically including whether to rotate, the rotate direction,
etc.
Step 705: monitoring, diagnosis and analysis.
The industrial computer processes the signals from the MCU. The industrial
computer is installed with monitoring, diagnosis and analysis software, and
can realize
data browsing, tail rope rotation curve drawing, tail rope rotation simulated
animation,
historical data query, fault diagnosis and alarm, and other functions.
The above are only preferred embodiments of the present invention, and are not
intended to limit the protection scope of the present invention. Any
modification,
equivalent substitution, improvement, etc. made within the spirit and
principle of the
present invention should be included in the protection scope of the present
invention.
Industrial applicability
The device for monitoring the tail rope of the mine hoisting system according
to
the embodiment of the present invention can monitor the working state of a
tail rope in
real time, so that the mine hoisting system is controlled or adjusted based on
the
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working state of the tail rope, and thus is safer.
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