U.S. patent application number 16/303143 was filed with the patent office on 2019-11-14 for automatic straightening device and method for scraper conveyor on fully-mechanized coal mining face based on tensile and compres.
This patent application is currently assigned to CHINA UNIVERSITY OF MINING AND TECHNOLOGY. The applicant listed for this patent is CHINA UNIVERSITY OF MINING AND TECHNOLOGY, XUZHOU GOLDFLUID HYDRAULIC TECHNOLOGY DEVELOPMENT CO., LTD.. Invention is credited to KAI FAN, XULIANG LU, YIQIAO MAN, LEI SI, CHAO TAN, ZHONGBIN WANG, HAIFENG YAN.
Application Number | 20190345824 16/303143 |
Document ID | / |
Family ID | 59413922 |
Filed Date | 2019-11-14 |
![](/patent/app/20190345824/US20190345824A1-20191114-D00001.png)
United States Patent
Application |
20190345824 |
Kind Code |
A1 |
YAN; HAIFENG ; et
al. |
November 14, 2019 |
AUTOMATIC STRAIGHTENING DEVICE AND METHOD FOR SCRAPER CONVEYOR ON
FULLY-MECHANIZED COAL MINING FACE BASED ON TENSILE AND COMPRESSIVE
FORCE SENSORS
Abstract
An automatic straightening device includes a fully-mechanized
coal mining working face, which includes a plurality of middle
troughs, and each middle trough is connected to a push-pull rod of
one hydraulic support. The fully-mechanized coal mining working
face is provided with the automatic straightening device. The
automatic straightening device includes a flexible element rope,
the tensile and compressive force sensors, and a signal processing
device. Each middle trough is provided with two tensile and
compressive force sensors; one end of the flexible element rope is
connected to a rope extend-retract control device, and the other
end of the flexible element rope sequentially passes through
lifting rings to be connected to the tensile and compressive force
sensors and is fixed to a positioning force bearing bolt on the
outermost side.
Inventors: |
YAN; HAIFENG; (Xuzhou,
CN) ; WANG; ZHONGBIN; (Xuzhou, CN) ; LU;
XULIANG; (Xuzhou, CN) ; TAN; CHAO; (Xuzhou,
CN) ; SI; LEI; (Xuzhou, CN) ; MAN; YIQIAO;
(Xuzhou, CN) ; FAN; KAI; (Xuzhou, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CHINA UNIVERSITY OF MINING AND TECHNOLOGY
XUZHOU GOLDFLUID HYDRAULIC TECHNOLOGY DEVELOPMENT CO.,
LTD. |
Xuzhou
Xuzhou, Jiangsu |
|
CN
CN |
|
|
Assignee: |
CHINA UNIVERSITY OF MINING AND
TECHNOLOGY
Xuzhou
CN
XUZHOU GOLDFLUID HYDRAULIC TECHNOLOGY DEVELOPMENT CO.,
LTD.
Xuzhou, Jiangsu
CN
|
Family ID: |
59413922 |
Appl. No.: |
16/303143 |
Filed: |
December 1, 2017 |
PCT Filed: |
December 1, 2017 |
PCT NO: |
PCT/CN2017/114276 |
371 Date: |
November 20, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B65G 23/44 20130101;
B65G 2203/042 20130101; E21F 13/066 20130101; B65G 2201/045
20130101 |
International
Class: |
E21F 13/06 20060101
E21F013/06; B65G 23/44 20060101 B65G023/44 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 23, 2017 |
CN |
201710058095.6 |
Claims
1. An automatic straightening device for a scraper conveyor on a
fully-mechanized coal mining face based on tensile and compressive
force sensors, comprising a fully-mechanized coal mining working
face; wherein the fully-mechanized coal mining working face
comprises a plurality of middle troughs, and each middle trough is
connected to a push-pull rod of a hydraulic support; wherein, the
fully-mechanized coal mining working face is provided with the
automatic straightening device, and the automatic straightening
device comprises a flexible element rope, the tensile and
compressive force sensors, and a signal processing device, wherein:
each middle trough is provided with two tensile and compressive
force sensors; one end of the flexible element rope is connected to
a rope extend-retract control device, and an other end of the
flexible element rope sequentially passes through lifting rings to
be connected to the tensile and compressive force sensors and is
fixed to an outermost tensile and compressive force sensor; the
rope extend-retract control device is configured for automatically
adjusting extension and retraction of the flexible element rope
according to positions of the middle troughs; the tensile and
compressive force sensors are configured for detecting
corresponding compressive force F.sub.Y and tensile force F.sub.L
according to the extension and retraction of the flexible element
rope, and configured for feeding back the detected compressive
force F.sub.Y and tensile force F.sub.L to the signal processing
device in real time; and according to the compressive force F.sub.Y
and tensile force F.sub.L fed back by each tensile and compressive
force sensor, the signal processing device compares, one by one,
magnitudes of compressive force F.sub.Y and tensile force F.sub.L
fed back by two adjacent tensile and compressive force sensors on
two adjacent middle troughs, to control a position of a right-side
middle trough of the two adjacent middle troughs and an action of a
hydraulic support corresponding to the right-side middle trough,
until voltage values fed back by the two adjacent tensile and
compressive force sensors on the two adjacent middle troughs are
equal and are both zero, so as to complete rightward straightness
adjustment; the signal processing device compares, one by one,
magnitudes of compressive force F.sub.Y and tensile force F.sub.L
fed back by the two adjacent tensile and compressive force sensors
on the two adjacent middle troughs, to control a position of a
left-side middle trough of the two adjacent middle troughs and an
action of a hydraulic support corresponding to the left-side middle
trough, until values fed back by the two adjacent tensile and
compressive force sensors on the two adjacent middle troughs are
equal and are both zero, so as to complete leftward straightness
adjustment.
2. The automatic straightening device for a scraper conveyor on a
fully-mechanized coal mining face according to claim 1, wherein,
the tensile and compressive force sensors are fiber grating tensile
and compressive force sensors.
3. The automatic straightening device for a scraper conveyor on a
fully-mechanized coal mining face according to claim 2, wherein,
one end of the fiber grating tensile and compressive force sensor
is mounted on the middle trough, and other end of the fiber grating
tensile and compressive force sensor is provided with a lifting
ring; the flexible element rope is connected to the corresponding
fiber grating sensors via respective lifting rings.
4. The automatic straightening device for a scraper conveyor on a
fully-mechanized coal mining face according to claim 3, wherein,
the two tensile and compressive force sensors provided with each
middle trough are respectively a tensile and compressive force
sensor A and a tensile and compressive force sensor B; an imaginary
line connecting a center of a lifting ring on the tensile and
compressive force sensor A and a center of a lifting ring on the
tensile and compressive force sensor B is parallel to both a rear
end face and an upper end face of the middle trough.
5. The automatic straightening device for a scraper conveyor on a
fully-mechanized coal mining face according to claim 4, wherein,
the two tensile and compressive force sensors provided with each
middle trough are mounted on the rear end face of the middle trough
at a distance of 1/4 of a width of the middle trough from a left
side edge and a right side edge of the middle trough
respectively.
6. The automatic straightening device for a scraper conveyor on a
fully-mechanized coal mining face according to claim 1, wherein,
the tensile and compressive force sensors are fixedly mounted on
the middle trough by means of bolt assemblies.
7. An automatic straightening method for a scraper conveyor on a
fully-mechanized coal mining face, comprising the following steps:
for a fully-mechanized coal mining scraper conveyor having N middle
troughs, mounting a tensile and compressive force sensor on the
rear end face of the middle trough at a distance of 1/4 of a width
of the middle trough from each side edge of the middle trough,
wherein a tensile and compressive force sensor on the left side of
the middle trough is a tensile and compressive force sensor A, and
a tensile and compressive force sensor on the right side of the
middle trough is a tensile and compressive force sensor B; and for
each middle trough, an imaginary line connecting a center of a
lifting ring on the tensile and compressive force sensor A and a
center of a lifting ring on the tensile and compressive force
sensor B is parallel to both the rear end face and an upper end
face of the middle trough; connecting one end of a flexible element
rope to a rope extend-retract control device and making other end
of the flexible element rope sequentially pass through lifting
rings on top of the tensile and compressive force sensors and be
fixed to a positioning force bearing bolt on outermost side;
selecting one group as a target group according to information fed
back by the tensile and compressive force sensor A and the tensile
and compressive force sensor B on each middle trough, wherein
compressive force is a positive value and tensile force is a
negative value; and adjusting two middle troughs adjacent to the
target group by using the target group as a reference for
comparison; rightward straightness adjustment: using a tensile and
compressive force value detected by the tensile and compressive
force sensor B in the target group as a reference value U; if a
tensile and compressive force value detected by a tensile and
compressive force sensor A in the adjacent group on the right side
is greater than the reference value U, generating a positive
voltage signal and controlling a hydraulic support to push forward
a middle trough of the corresponding group; if a tensile and
compressive force value detected by a tensile and compressive force
sensor A in the adjacent group on the right side is less than the
reference value U, generating a negative voltage signal and
controlling a hydraulic support to pull back a middle trough of the
corresponding group, until the tensile and compressive force value
detected by the tensile and compressive force sensor B in the
target group and the tensile and compressive force value detected
by the tensile and compressive force sensor A in the adjacent group
on the right side are equal and are equal to zero; using the
adjacent group on the right side that completes positioning as a
target group for sequentially adjusting adjacent groups rightwards,
and repeating the aforementioned steps until all the middle troughs
are in a straight line; and leftward straightness adjustment: using
a tensile and compressive force value detected by the tensile and
compressive force sensor A in the target group as a reference value
U, and if a tensile and compressive force value detected by a
tensile and compressive force sensor B in the adjacent group on the
left side is greater than the reference value U, generating a
positive voltage signal and controlling a hydraulic support to push
forward a middle trough of the corresponding group; if a tensile
and compressive force value detected by a tensile and compressive
force sensor in the adjacent group on the left side is less than
the reference value U, generating a negative voltage signal and
controlling a hydraulic support to pull back a middle trough of the
corresponding group, until the tensile and compressive force value
detected by the tensile and compressive force sensor A in the
target group and the tensile and compressive force value detected
by the tensile and compressive force sensor B in the adjacent group
on the left side are equal and are equal to zero; using the
adjacent group that completes positioning as a target group for
sequentially adjusting adjacent groups leftwards, and repeating the
aforementioned steps until all the middle troughs are in a straight
line.
Description
CROSS REFERENCE TO THE RELATED APPLICATIONS
[0001] This application is the national phase entry of
International Application No. PCT/CN2017/114276, filed on Dec. 1,
2017, which claims priority to Chinese Patent Application
201710058095.6 filed on Jan. 23, 2016, the entire contents of which
are incorporated herein by reference.
TECHNICAL FIELD
[0002] The present invention relates to a device and method for
controlling straightness of a scraper conveyor body on a
fully-mechanized coal mining face, and specifically to automatic
straightening for a scraper conveyor under a coal mine, and belongs
to the field of automatic straightening for scraper conveyor
bodies.
BACKGROUND
[0003] During use on a fully-mechanized coal mining working face, a
scraper conveyor needs to withstand a variety of complex conditions
such as compressive force, tensile force, impact, bending,
friction, and corrosion. The scraper conveyor, under huge load
impact, is also affected by the operating level of on-site workers.
With improper operation, the body straightness of the scraper
conveyor will be unable to meet production and use requirements,
causing breakage of a scraper chain, wearing of middle troughs, and
severe deformation of the conveyor body, and then causing a series
of failures including even a failure in normal operation of the
whole coal mining process, which has huge safety hazards. Failure
handling of the scraper conveyor wastes a lot of time, and
especially when the body straightness of the scraper conveyor
cannot be guaranteed, on one hand, the working state of a hydraulic
support on the roof of the fully-mechanized coal mining face; on
the other hand, the scraper chain is tilted and wears out rapidly,
the service life of the scraper chain is shortened, and even chain
breakage is caused, and thus the scraper conveyor on the
fully-mechanized coal mining face cannot work or operate and the
production efficiency is affected. More than ten minutes are
generally required if the scraper is tilted, while more than one
and a half hour is required for stop handling in case of chain
breakage, which has adverse effects on efficient production.
[0004] The scraper conveyor consists of a trough, a pulling chain,
a scraper, a head drive chain, a tail tension sprocket, and the
like, plays a very important role in coal production, has
characteristics of large conveying capacity, long conveying
distance, low energy consumption, and the like, and is not only
used in coal and mines, but also widely applied in metallurgy,
building materials, cement, and other sectors. The scraper conveyor
is a large-scale mechanical equipment, and upon failure, at best, a
lot of time and material resources are wasted for maintenance; at
worst, the machine is rendered useless, which will cause great
economic loss to the enterprise and even threaten the life safety
of workers.
[0005] Most of domestic coal mines still use a manual method for
straightening a scraper conveyor body, positions of middle troughs
in the scraper conveyor are adjusted using an operating valve of a
hydraulic support, and a displacement of a jack moved by the
support is determined by workers according to the working condition
of a fully-mechanized coal mining face and working experience.
Since the working conditions underground are complex and the
experience of the workers varies, the accuracy is low and this
method is unreliable.
SUMMARY
[0006] In view of the aforementioned problems existing in the prior
art, the present invention provides an automatic straightening
device and method for a scraper conveyor on a fully-mechanized coal
mining face based on tensile and compressive force sensors, where
tensile and compressive force sensors in front of middle troughs
and a flexible element rope are used as tool reference, and each
middle trough is straightened using a central controller, so that
the overall straightness of the scraper conveyor body is
guaranteed, and the mechanism is simple, and has quick response,
high precision, and high cost performance.
[0007] In order to achieve the aforementioned technical objective,
the present invention will adopt the following technical
solution:
[0008] An automatic straightening device for a scraper conveyor on
a fully-mechanized coal mining face based on tensile and
compressive force sensors includes a fully-mechanized coal mining
working face, where the fully-mechanized coal mining working face
includes a plurality of middle troughs, and each middle trough is
connected to a push-pull rod of a hydraulic support, characterized
in that the fully-mechanized coal mining working face is provided
with the automatic straightening device, and the automatic
straightening device includes a flexible element rope, the tensile
and compressive force sensors, and a signal processing device,
where each middle trough is provided with two tensile and
compressive force sensors; one end of the flexible element rope is
connected to a rope extend-retract control device, and the other
end of the flexible element rope sequentially passes through
lifting rings to be connected to the tensile and compressive force
sensors and is fixed to a tensile and compressive force sensor (the
sensor is replaced with a positioning force bearing bolt) on the
outermost side; the rope extend-retract control device is capable
of automatically adjusting extension and retraction of the flexible
element rope according to positions of the middle troughs; the
tensile and compressive force sensors are capable of detecting
corresponding compressive force F.sub.Y and tensile force F.sub.L
according to the extension and retraction of the flexible element
rope, and capable of feeding back the detected compressive force
F.sub.Y and tensile force F.sub.L to the signal processing device
in real time; and according to the compressive force F.sub.Y and
tensile force F.sub.L fed back by each tensile and compressive
force sensor, the signal processing device compares, one by one,
magnitudes of compressive force F.sub.Y and tensile force F.sub.L
fed back by two adjacent tensile and compressive force sensors on
two adjacent middle troughs, to control a position of a right-side
middle trough of the two adjacent middle troughs and an action of a
hydraulic support corresponding to the right-side middle trough,
until values fed back by the two adjacent tensile and compressive
force sensors on the two adjacent middle troughs are equal and are
both zero, so as to complete rightward straightness adjustment; the
signal processing device compares, one by one, magnitudes of
compressive force F.sub.Y and tensile force F.sub.L fed back by two
adjacent tensile and compressive force sensors on two adjacent
middle troughs, to control a position of a left-side middle trough
of the two adjacent middle troughs and an action of a hydraulic
support corresponding to the left-side middle trough, until values
fed back by the two adjacent tensile and compressive force sensors
on the two adjacent middle troughs are equal and are both zero, so
as to complete leftward straightness adjustment.
[0009] As a further improvement to the present invention, the
tensile and compressive force sensor is a fiber grating tensile and
compressive force sensor.
[0010] As a further improvement to the present invention, one end
of the fiber grating tensile and compressive force sensor is
mounted on the middle trough, and the other end of the fiber
grating tensile and compressive force sensor is provided with a
lifting ring; the flexible element rope is connected to the
corresponding fiber grating sensors through respective lifting
rings.
[0011] As a further improvement to the present invention, two
tensile and compressive force sensors on each middle trough are
respectively a tensile and compressive force sensor A and a tensile
and compressive force sensor B; an imaginary line connecting a
center of a lifting ring on the tensile and compressive force
sensor A and a center of a lifting ring on the tensile and
compressive force sensor B is parallel to both a rear end face and
an upper end face of the middle trough.
[0012] As a further improvement to the present invention, two
tensile and compressive force sensors on each middle trough are
mounted on the rear end face of the middle trough at a distance of
1/4 of a width of the middle trough from a left side edge and a
right side edge respectively.
[0013] As a further improvement to the present invention, the
tensile and compressive force sensors are fixedly mounted on the
middle trough by means of bolt assemblies.
[0014] Another technical objective of the present invention is to
provide an automatic straightening method for a scraper conveyor on
a fully-mechanized coal mining face, which includes the following
steps: (1) for a fully-mechanized coal mining scraper conveyor
having N middle troughs, respectively mounting one tensile and
compressive force sensor on a rear end face of the middle trough at
a distance of 1/4 of a width of the middle trough from each side
edge of the middle trough, where a tensile and compressive force
sensor on the left side of the middle trough is a tensile and
compressive force sensor A, and a tensile and compressive force
sensor on the right side of the middle trough is a tensile and
compressive force sensor B; and for each middle trough, an
imaginary line connecting a center of a lifting ring on the tensile
and compressive force sensor A and a center of a lifting ring on
the tensile and compressive force sensor B is parallel to the rear
end face and an upper end face of the middle trough respectively;
(2) connecting one end of a flexible element rope to a rope
extend-retract control device and making the other end of the
flexible element rope sequentially pass through lifting rings on
top of the tensile and compressive force sensors and be fixed to a
positioning force bearing bolt on the outermost side; (3) selecting
one group as a target group according to information fed back by
the tensile and compressive force sensor A and the tensile and
compressive force sensor B on each middle trough, where compressive
force is a positive value and tensile force is a negative value;
and adjusting two middle troughs adjacent to the target group by
using the target group as a reference for comparison; (4) rightward
straightness adjustment: using a tensile and compressive force
value detected by a tensile and compressive force sensor B in the
target group as a reference value U; if a tensile and compressive
force value detected by a tensile and compressive force sensor A in
the adjacent group on the right side is greater than the reference
value U, generating a positive voltage signal and controlling a
hydraulic support to push forward a middle trough in the
corresponding group; if a tensile and compressive force value
detected by a tensile and compressive force sensor in the adjacent
group on the right side is less than the reference value U,
generating a negative voltage signal and controlling a hydraulic
support to pull back a middle trough in the corresponding group,
until the tensile and compressive force value detected by the
tensile and compressive force sensor B in the target group and the
tensile and compressive force value detected by the tensile and
compressive force sensor A in the adjacent group on the right side
are equal and are equal to zero; using the adjacent group that
completes positioning as a target group for sequentially adjusting
adjacent groups rightwards, and repeating the aforementioned steps
until all the middle troughs are in a straight line; and (5)
leftward straightness adjustment: using a tensile and compressive
force value detected by a tensile and compressive force sensor A in
the target group as a reference value U, and if a tensile and
compressive force value detected by a tensile and compressive force
sensor B in the adjacent group on the left side is greater than the
reference value U, generating a positive voltage signal and
controlling a hydraulic support to push forward a middle trough in
the corresponding group; if a tensile and compressive force value
detected by a tensile and compressive force sensor in the adjacent
group on the left side is less than the reference value U,
generating a negative voltage signal and controlling a hydraulic
support to pull back a middle trough in the corresponding group,
until the tensile and compressive force value detected by the
tensile and compressive force sensor A in the target group and the
tensile and compressive force value detected by the tensile and
compressive force sensor B in the adjacent group on the left side
are equal and are equal to zero; using the adjacent group that
completes positioning as a target group for sequentially adjusting
adjacent groups leftwards, and repeating the aforementioned steps
until all the middle troughs are in a straight line.
[0015] According to the aforementioned technical solutions, as
compared with the prior art, the present invention has the
following advantages:
[0016] the device uses the tensile and compressive force sensors as
detection tools and the flexible element rope as a virtual digital
reference straight line, compressive force and tensile force
detected by the tensile and compressive force sensor are converted
into voltage signals and transmitted to a signal processing control
system for data fitting, and positions of the middle troughs are
adjusted according to the result of signal processing, so that
tensile and compressive force values in all groups are equal and
are equal to zero, and then automatic straightening of the scraper
conveyor body is completed. The device has high precision and cost
performance, can overcome the severe environment under a coal mine
and has long service life.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 is a schematic flowchart of an automatic
straightening method for a scraper conveyor in the present
invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] The technical solutions in the embodiments of the present
invention will be clearly and fully described below with reference
to the accompanying drawings in the embodiments of the present
invention. It is obvious that the embodiments to be described are
only a part rather than all of the embodiments of the present
invention. The following description of at least one exemplary
embodiment is actually illustrative only, and not intended to be
any limitation on the present invention and its application or use.
All other embodiments derived by those of ordinary skill in the art
based on the embodiments of the present invention without carrying
out creative activities should fall within the scope of the present
invention. The relative arrangement of parts and steps,
expressions, and numeric values set forth in these embodiments are
not to be construed as limiting the present invention, unless
otherwise specified. It is also understood that, for convenience of
description, the sizes of the various components shown in the
drawings are not necessarily drawn in actual proportional
relationship. Techniques, methods, and devices known to those of
ordinary skill in the relevant art may not be discussed in detail,
but in appropriate situations, these techniques, methods, and
devices should be considered as part of the granted specification.
In all examples shown and discussed herein, any particular values
should be construed as merely illustrative, rather than as
limitation. Therefore, other examples of the exemplary embodiments
may have different values.
[0019] Spatially relative terms, such as "over . . . ", "above . .
. ", "on the upper surface of . . . ", and "on", may be used herein
for ease of description to describe the spatial position
relationship of one component or feature with another component or
feature, as illustrated in the FIGURES. It will be understood that
the spatially relative terms are intended to encompass different
orientations of the component in use or operation in addition to
the orientations depicted in the FIGURES. For example, if the
component in the FIGURES is turned over, the component described as
"above another component or configuration" or "over another
component or configuration" would then be oriented "below another
component or configuration" or "beneath another component or
configuration". Thus, the exemplary term "above . . . " may
encompass both an orientation of "above . . . " and "below . . . ".
The component may be otherwise oriented (rotated 90 degrees or at
other orientations).
[0020] As shown in FIG. 1, an automatic straightening device for a
scraper conveyor on a fully-mechanized coal mining face based on
tensile and compressive force sensors in the present invention
includes a signal collection system, a signal processing control
system, and a mechanism execution system. The signal collection
system mainly includes fiber grating tensile and compressive force
sensors and a flexible element rope, which are mounted on rear end
faces of middle troughs; the signal processing control system
mainly consists of a data transmission module and a data processing
module, and two ends thereof are respectively connected to the
signal collection end and hydraulic supports of the execution
system; the mechanism execution system mainly consists of the
hydraulic supports, push-pull rods, and the middle troughs, where
the hydraulic supports control positions of the middle trough by
means of the push-pull rods.
[0021] Tensile and compressive force sensors are mounted on the
rear end face of the middle trough at a distance of 1/4 of a width
of the middle trough from a left side edge and a right side edge
respectively, two tensile and compressive force sensors of the same
specification are mounted on each middle trough and are labeled A
and B, and it is ensured that an imaginary line connecting lifting
rings on top of the sensors A and B is parallel to both the upper
end and the rear end, where a bolt lifting ring and a positioning
force bearing bolt are respectively on the leftmost end and the
rightmost end of the middle troughs on the entire working face and
are respectively used to assist in positioning two ends of the rope
to ensure the overall straightness. One middle trough and one
corresponding hydraulic support form one group, and the hydraulic
supports and middle troughs on the fully-mechanized coal mining
working face are divided into N groups, and are sequentially
numbered. An appropriate hydraulic support group and middle trough
combination R is selected as a target group according to collected
signals, and two adjacent groups (R-1 and R+1) are adjusted by
using the target group R as a reference for comparison.
[0022] It should be particularly noted that the sensor A in the
middle trough in the first group and the sensor B in the middle
trough in the N.sup.th group located at two ends are respectively
the bolt lifting ring and the positioning force bearing bolt, which
play a supporting role in place of sensors and mainly withstand a
force in the direction of the rope and assist in adjusting the
straightness of the scraper conveyor.
[0023] The tensile and compressive force sensor is fixedly mounted
on the middle trough by means of a bolt assembly, and the bolt
assembly includes a bolt and a gasket; the gasket is placed between
the tensile and compressive force sensor and the middle trough, and
the bolt sequentially passes through the middle trough, the gasket,
and the tensile and compressive force sensor, so as to fix the
tensile and compressive force sensor to the middle trough.
The flexible element rope sequentially passes through lifting rings
on top of all tensile and compressive force sensors, one end of the
flexible element rope is fixed to the tensile and compressive force
sensor A on the outermost side of the middle troughs in the scraper
conveyor terminal, and the other end of the flexible element rope
is connected to a device for controlling rope extension and
retraction. The device for controlling rope extension and
retraction can automatically extend and retract the flexible
element rope according to positions of the N middle troughs, so
that the flexible element rope can always maintain a certain degree
of tension, and thus the tensile and compressive force sensors
produce corresponding tensile force and compressive force.
[0024] A straightening method in the present invention is described
in detail below:
[0025] rightward straightness adjustment: a tensile and compressive
force value detected by a tensile and compressive force sensor B in
the target group R is used as a reference value U (where the
compressive force is a positive value and the tensile force is a
negative value), if a value of a tensile and compressive force
sensor A in the adjacent group (R+1) is greater than the reference
value U, a positive voltage signal is generated, and the mechanism
execution system controls a hydraulic support to push forward a
middle trough in the corresponding group; if a value of a tensile
and compressive force sensor A in the adjacent group (R+1) is less
than U, a negative voltage signal is generated, and the mechanism
execution system controls a hydraulic support to pull back a middle
trough in the corresponding group, until the value of the tensile
and compressive force sensor B in the target group R and the value
of the tensile and compressive force sensor A in the adjacent group
(R+1) are equal and are equal to zero. The adjacent group (R+1)
that completes positioning is used as a target group for
sequentially adjusting adjacent groups, and the aforementioned
steps are repeated until all the middle troughs are in a straight
line, so as to complete automatic straightening of the scraper
conveyor.
Leftward straightness adjustment: a tensile and compressive force
value detected by a tensile and compressive force sensor A in the
target group R is used as a reference value U, if a value of a
tensile and compressive force sensor B in the adjacent group (R-1)
is greater than the reference value U, a positive voltage signal is
generated, and the mechanism execution system controls a hydraulic
support to push forward a middle trough in the corresponding group;
if a value of a tensile and compressive force sensor B in the
adjacent group (R-1) is less than U, a negative voltage signal is
generated, and the mechanism execution system controls a hydraulic
support to pull back a middle trough in the corresponding group,
until the value of the tensile and compressive force sensor A in
the target group R and the value of the tensile and compressive
force sensor B in the adjacent group (R-1) are equal and are equal
to zero. The adjacent group (R-1) that completes positioning is
used as a target group for sequentially adjusting adjacent groups,
and the aforementioned steps are repeated until all the middle
troughs are in a straight line, so as to complete automatic
straightening of the scraper conveyor. Thereby, it is ensured that
the middle troughs are in one straight line on the whole to
complete adjustment.
* * * * *