CN108439141B - Elevator rope detection device - Google Patents
Elevator rope detection device Download PDFInfo
- Publication number
- CN108439141B CN108439141B CN201810316195.9A CN201810316195A CN108439141B CN 108439141 B CN108439141 B CN 108439141B CN 201810316195 A CN201810316195 A CN 201810316195A CN 108439141 B CN108439141 B CN 108439141B
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- CN
- China
- Prior art keywords
- wirerope
- platform
- rope
- steady wheel
- rope sheave
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B7/00—Other common features of elevators
- B66B7/12—Checking, lubricating, or cleaning means for ropes, cables or guides
- B66B7/1207—Checking means
- B66B7/1215—Checking means specially adapted for ropes or cables
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
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- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
Abstract
The present invention relates to technical field of elevator equipment, and in particular to steady wheel is arranged between two rope sheaves in elevator rope detection device, including platform；Wirerope between steady wheel and wherein any one rope sheave is arranged detection pipe；Power supply is set on platform, one of electrode of power supply is connect with detection pipe by conducting wire, another electrode of power supply is connect with any one in steady wheel and rope sheave by conducting wire, connection signal transmitter on conducting wire, controller is set on platform and alarm, alarm are connected with controller.Elevator rope detection device provided by the invention, there is fracture of wire in wirerope, fracture of wire on wirerope is the state tilted, it contacts the fracture of wire of wirerope with detection pipe, so that power supply, wirerope, fracture of wire, detection pipe is formed the circuit being connected to signal projector, signal projector is made to issue signal to controller, controller controls alarm and carries out alarm, there is fracture of wire in prompt person wirerope, to be replaced in time, reduces the generation of dangerous situation.
Description
Technical field
The present invention relates to technical field of elevator equipment, and in particular to elevator rope detection device.
Background technique
Elevator refers to that the transporting equipment for serving several specific floors in building, lift car 13 are led by wirerope
Draw, then by traction machine traction steel-cable, moves up and down carriage.
As soon as elevator is the highly safe equipment of needs, the failure of any one component easily causes personnel
Injures and deaths.
The service life of elevator is very long, but with commonly using elevator, it is easy to wherein parts damages are caused, but it is electric
Ladder maintenance is difficult, and especially wirerope is used in long-time, it is easy to which fatigue is easy to happen fracture, works as wire cable rupture
After several steel wires, the integral strength of wirerope is just changed, if continued to use, risk is very high.
Summary of the invention
The technical problem to be solved in the present invention is that overcoming the defects of above-mentioned background technique.
For this purpose, the technical solution used, elevator rope detection device, comprising: wirerope, rope sheave, the number of rope sheave are two
A, the axis of two rope sheaves is in same level and is arranged in parallel, and wirerope rides upon on two rope sheaves, and two rope sheaves are located at steel
The both ends of the same side of cord, wirerope are separately connected clump weight and carriage, further include platform, are arranged between two rope sheaves and stablize
Wheel, steady wheel are fixed on platform, and wirerope rides upon on steady wheel, and the axis of steady wheel and the axis of rope sheave are arranged in parallel；
Wirerope between steady wheel and wherein any one rope sheave is arranged detection pipe, and detection pipe is fixed on platform, detection pipe and steel
Cord coaxial arrangement, the internal diameter of detection pipe are greater than the diameter of wirerope；Power supply is set on platform, one of electrode of power supply with
Detection pipe is connected by conducting wire, another electrode of power supply is connect with any one in steady wheel and rope sheave by conducting wire, and
The connection signal transmitter on the conducting wire, signal projector are arranged on platform, and controller and alarm, control are arranged on platform
Device is connected with power supply, and alarm is connected with controller.
In order to save electric energy, power supply is connected with steady wheel or rope sheave in the usage time interval of corresponding daily elevator, only electric
In use, wirerope is just mobile for ladder, can just detect whether to be broken, and preferred technical solution is, power supply and steady wheel or
Connection Time relay on the conducting wire of rope sheave connection, the time relay are arranged on platform, and the time relay is connected with controller.
In order to which the wirerope between two rope sheaves does not shake, make wirerope in the case where no fracture of wire, not with inspection
Test tube contact, preferred technical solution is, steady wheel and the rope sheave two sides that wirerope is arranged in is opposite, the minimum point of steady wheel
Height of the height lower than the highest point of rope sheave；
Alternatively, the same side of wirerope is arranged in steady wheel and rope sheave, the height of the highest point of steady wheel is higher than rope sheave
The height of highest point.
Wire cable rupture in order to prevent is passed once the wirerope between detection pipe and clump weight is broken by pressure
Sensor induction pressure carries out judging whether to be broken, and when wire cable rupture pressure sensor detects that pressure moment becomes smaller, passes through control
Device processed controls two positioning rings and compresses, to be clamped wirerope by connecting rod, preferred technical solution is that rope sheave passes through first
Bracket is fixed on platform；Steady wheel is fixed on platform by second support, and pressure is arranged between second support and platform
Force snesor, pressure sensor are connected with controller；Detection pipe is fixed on platform by third bracket, and detection pipe corresponds to third
Sliding block is arranged in the side of bracket, and slideway is arranged on third bracket, and sliding block is arranged in slideway；Detection pipe includes the positioning at both ends
Ring, sliding block are positioned close on the positioning ring of clump weight, and the positioning ring close to carriage is fixedly connected with third bracket, two positioning
The opposite side of ring respectively corresponds hinged several connecting rods, and corresponding connecting rod is hinged；The side that the positioning ring of sliding block is arranged is vertical
Be uniformly arranged several telescopic rods, telescopic rod is connect with controller, the both ends of telescopic rod respectively with positioning ring and corresponding
One bracket or second support connection.
In order to make the connecting rod being hinged be easier to rotate towards detection pipe axis direction, preferred technical solution is phase
Mutually the angular range between hinged connecting rod is between 165 ° to 175 °.
In order to enable connecting rod preferably to fix wirerope, preferred technical solution is the end for the connecting rod being hinged
It is respectively provided with anti-skidding cambered surface, non-slip texture is set in anti-skidding cambered surface.
Telescopic rod is disconnected with positioning ring and first support or second support in order to prevent, and hydraulic stem is by steel wire rope clamp
Tightly, after telescopic rod and positioning ring and first support or second support disconnect, due to the self weight of carriage, draw wirerope
Hydraulic stem it is mobile, so that connecting rod be made to clamp wirerope, preferred technical solution is positioning ring of the detection pipe close to clump weight
Two hydraulic stems of interior diametrically opposite setting, towards positioning ring, positioning ring corresponds to the extension end of hydraulic stem for the extension end of hydraulic stem
Through-hole is set, hydraulic pump, hydraulic pump and hydraulic stem are set by piping connection, hydraulic pump is connect with controller on platform.
Third bracket disconnects in order to prevent, and after third bracket disconnects, positioning ring will be stuck in anti-drop block and rope sheave or steady
Between fixed wheel, prevent carriage from falling, preferred technical solution is, on the rope sheave or steady wheel opposite close to the positioning ring of carriage
Side's setting anti-drop block, the anti-drop block side opposite with rope sheave or steady wheel open up slot, and anti-drop block and platform pass through the 4th bracket
Connection.
The operation principle of the present invention is that:
The present invention provides elevator rope detection devices to control time relay closure in the period that elevator uses, first
There is fracture of wire in first wirerope, and the fracture of wire on wirerope is the state tilted, contacts the fracture of wire of wirerope with detection pipe, makes electricity
Source, wirerope, fracture of wire, detection pipe and signal projector form the circuit being connected to, and signal projector is made to issue signal to controller,
Controller controls alarm and carries out alarm, and controller is connected with elevator central control system, and alarm and central control system communicate to connect, report
Alert device issues alarm signal to central control system, and after staff receives alarm signal, control elevator is out of service, and is examined
It repairs；When wirerope is not broken, pressure sensor experiences the pressure of second support, the steel between detection pipe and equipped block
Cord is broken, and wirerope does not oppress steady wheel, causes the pressure signal moment of pressure sensor to become smaller, controller
Control telescopic rod and hydraulic pump work at the same time, and telescopic rod moment compresses two positioning rings, makes the connecting rod between two positioning rings
Hinged place towards the central axis of detection pipe, wirerope is clamped by anti-skidding cambered surface, while hydraulic pump control hydraulic stem is stretched
Out, wirerope is clamped, wirerope is prevented to be detached from anti-skidding cambered surface, once telescopic rod and positioning ring and first support or second
Frame disconnects, and due to the self weight of carriage, so that wirerope is hauled hydraulic stem mobile, so that connecting rod be made to clamp wirerope, when the
After three brackets disconnect, positioning ring will be stuck between anti-drop block and rope sheave or steady wheel, prevent carriage from falling.
Technical solution of the present invention has the advantages that
There is fracture of wire in elevator rope detection device provided by the invention, wirerope, and the fracture of wire on wirerope is the shape tilted
State contacts the fracture of wire of wirerope with detection pipe, is connected to power supply, wirerope, fracture of wire, detection pipe with signal projector composition
Circuit makes signal projector issue signal to controller, and controller controls alarm and carries out alarm, and prompt person wirerope occurs
Fracture of wire reduces the generation of dangerous situation to be replaced, to be overhauled in time.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is circuit diagram of the invention；
Fig. 2 is overall structure diagram of the invention；
Fig. 3 is the structural schematic diagram of detection pipe in the present invention；
Wherein, 10- wirerope；11- rope sheave；12- clump weight；13- carriage；14- steady wheel；15- anti-drop block；16- the 4th
Bracket；20- platform；21- detection pipe；211- sliding block；212- positioning ring；213- connecting rod；214- telescopic rod；The anti-skidding cambered surface of 215-；
216- hydraulic stem；217- hydraulic pump；22- power supply；23- signal projector；24- controller；25- alarm；26- time relay
Device；27- first support；28- second support；281- pressure sensor；29- third bracket；291- slideway.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As shown in Figure 1, 2, elevator rope detection device, comprising: wirerope 10, rope sheave 11, the number of rope sheave 11 are two,
The axis of two rope sheaves 11 is in same level and is arranged in parallel, and wirerope 10 rides upon on two rope sheaves 11, two rope sheaves 11
Positioned at the same side of wirerope 10, the both ends of wirerope 10 are separately connected clump weight 12 and carriage 13, which is characterized in that further include
Steady wheel 14 is arranged between two rope sheaves 11 for platform 20, and steady wheel 14 is fixed on platform 20, and wirerope 10 rides upon surely
On fixed wheel 14, the axis of the axis and rope sheave 11 of steady wheel 14 is arranged in parallel；Between steady wheel 14 and wherein any one rope sheave 11
Wirerope 10 is arranged detection pipe 21, and the material of detection pipe 21 is conductive metal material, and detection pipe 21 is fixed on platform 20, detects
Pipe 21 and wirerope 10 are coaxially disposed, and the internal diameter of detection pipe 21 is greater than the diameter of wirerope 10, and wirerope 10 fracture of wire occurs and then breaks
Silk is contacted with 21 inner wall of detection pipe；Power supply 22 is set on platform 20, and one of electrode of power supply 22 is with detection pipe 21 by leading
Line connection, another electrode of power supply 22 connect with any one in steady wheel 14 and rope sheave 11 by conducting wire, and is led at this
Connection signal transmitter 23 on line, signal projector 23 are bluetooth module, and signal projector 23 is arranged on platform 20, platform 20
Upper setting controller 24 and alarm 25, controller 24 and power supply 22 connect, and alarm 25 and controller 24 connect, signal transmitting
Device 23 and controller 24 pass through bluetooth or communication connection.Controller 24 is connected with elevator central control system, alarm 25 and middle control
System communication connection, alarm 25 issues alarm signal to central control system, and after staff receives alarm signal, control elevator stops
It only runs, and is overhauled.
In order to save electric energy, power supply 22 and steady wheel 14 or rope sheave 11 is connected in the usage time interval of corresponding daily elevator,
Only in use, wirerope 10 just moves elevator, can just detect whether to be broken, and preferred technical solution is power supply 22
Connection Time relay 26 on the conducting wire connecting with steady wheel 14 or rope sheave 11, the time relay 26 are arranged on platform 20, when
Between relay 26 and controller 24 connect.
In order to which the wirerope 10 between two rope sheaves 11 does not shake, make wirerope 10 in the case where no fracture of wire,
It is not contacted with detection pipe 21, preferred technical solution is, steady wheel 14 and rope sheave 11 two sides that wirerope 10 is arranged in is opposite, surely
Height of the height of the minimum point of fixed wheel 14 lower than the highest point of rope sheave 11；
Alternatively, the same side of wirerope 10 is arranged in steady wheel 14 and rope sheave 11, the height of the highest point of steady wheel 14 is high
Height in the highest point of rope sheave 11.
As shown in Figure 2,3, wirerope 10 is broken in order to prevent, once the wirerope 10 between detection pipe 21 and clump weight 12
It is broken, carries out judging whether to be broken by 281 induction pressure of pressure sensor, when 10 fracture pressure sensor of wirerope
281 detect that pressure moment becomes smaller, and control two positioning rings 212 by controller 24 and compress, to pass through connecting rod 213 for steel wire
Rope 10 clamps, and preferred technical solution is that rope sheave 11 is fixed on platform 20 by first support 27；Steady wheel 14 passes through second
Bracket 28 is fixed on platform 20, and pressure sensor 281, pressure sensor are arranged between second support 28 and platform 20
281 and controller 24 connect；Detection pipe 21 is fixed on platform 20 by third bracket 29, the corresponding third bracket 29 of detection pipe 21
Side sliding block 211 is set, slideway 291 is set on third bracket 29, and sliding block 211 is arranged in slideway 291；Detection pipe 21 includes
The positioning ring 212 at both ends, wirerope 10 are passed through from the inside of positioning ring 212, and sliding block 211 is positioned close to the positioning of clump weight 12
On ring 212, the positioning ring 212 close to carriage 13 is fixedly connected with third bracket 29, the opposite side difference of two positioning rings 212
Corresponding hinged several connecting rods 213, corresponding connecting rod 213 are hinged；The side that the positioning ring 212 of sliding block 211 is arranged is vertical uniform
Several telescopic rods 214 are set, telescopic rod 214 is connect with controller 24, the both ends of telescopic rod 214 respectively with positioning ring 212 and with
Corresponding first support 27 or second support 28 connect.
In order to make the connecting rod 213 being hinged be easier to rotate towards 21 axis direction of detection pipe, preferred technical solution
For the angular range between connecting rod 213 being hinged is between 165 ° to 175 °.
In order to enable connecting rod 213 preferably to fix wirerope 10, preferred technical solution is the connecting rod being hinged
213 end is respectively provided with anti-skidding cambered surface 215, and non-slip texture is arranged in anti-skidding cambered surface 215.
Telescopic rod 214 is disconnected with positioning ring 212 and first support 27 or second support 28 in order to prevent, hydraulic stem
216 clamp wirerope 10, after telescopic rod 214 is disconnected with positioning ring 212 and first support 27 or second support 28,
Due to the self weight of carriage 13, wirerope 10 is set to haul the movement of hydraulic stem 216, to make connecting rod 213 clamp wirerope 10, preferably
Technical solution be detection pipe 21 two hydraulic stems 216 of diametrically opposite setting, liquid in the positioning ring 212 of clump weight 12
Towards positioning ring 212, the extension end of the corresponding hydraulic stem 216 of positioning ring 212 is arranged through-hole for the extension end of compression bar 216, on platform 20
Hydraulic pump 217, hydraulic pump 217 and hydraulic stem 216 are set by piping connection, hydraulic pump 217 is connect with controller 24.
Third bracket 29 disconnects in order to prevent, and after third bracket 29 disconnects, positioning ring 212 will be stuck in anti-drop block 15 and rope
Between wheel 11 or steady wheel 14, prevent carriage 13 from falling, preferred technical solution is, close to 212 phase of positioning ring of carriage 13
Pair perhaps setting 15 anti-drop block 15 of the anti-drop block side opposite with rope sheave 11 or steady wheel 14 above steady wheel 14 of rope sheave 11
Slot is opened up, anti-drop block 15 is connect with platform 20 by the 4th bracket 16.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (6)
1. elevator rope detection device, comprising: wirerope (10), rope sheave (11), the number of rope sheave (11) are two, two rope sheaves
(11) axis is in same level and is arranged in parallel, and wirerope (10) rides upon on two rope sheaves (11), two rope sheaves (11)
Positioned at the same side of wirerope (10), the both ends of wirerope (10) are separately connected clump weight (12) and carriage (13), and feature exists
In further including platform (20), steady wheel (14) be arranged between two rope sheaves (11), steady wheel (14) is fixed at platform (20)
On, wirerope (10) rides upon on steady wheel (14), and the axis of the axis and rope sheave (11) of steady wheel (14) is arranged in parallel；Steady wheel
(14) and wherein the wirerope (10) between any one rope sheave (11) is arranged detection pipe (21), and detection pipe (21) is fixed on platform
(20) on, detection pipe (21) and wirerope (10) are coaxially disposed, and the internal diameter of detection pipe (21) is greater than the diameter of wirerope (10)；It is flat
Power supply (22) are set on platform (20), one of electrode of power supply (22) is connect with detection pipe (21) by conducting wire, power supply (22)
Another electrode connect with any one in steady wheel (14) and rope sheave (11) by conducting wire, and on the conducting wire connect letter
Number transmitter (23), signal projector (23) are arranged on platform (20), and controller (24) and alarm are arranged on platform (20)
(25), controller (24) and power supply (22) connection, alarm (25) and controller (24) connection；
The two sides opposite in wirerope (10) are arranged in steady wheel (14) and rope sheave (11), and the height of the minimum point of steady wheel (14) is low
Height in the highest point of rope sheave (11)；
Alternatively, steady wheel (14) and rope sheave (11) are arranged in the same side of wirerope (10), the height of the highest point of steady wheel (14)
Degree is higher than the height of the highest point of rope sheave (11)；
Rope sheave (11) is fixed on platform (20) by first support (27)；Steady wheel (14) is set by second support (28) fixation
It sets on platform (20), pressure sensor (281) is set between second support (28) and platform (20), pressure sensor (281)
It is connected with controller (24)；Detection pipe (21) is fixed on platform (20) by third bracket (29), detection pipe (21) corresponding the
Sliding block (211) are arranged in the side of three brackets (29), and slideway (291) are arranged on third bracket (29), and sliding block (211) is arranged in slideway
(291) in；Detection pipe (21) includes the positioning ring (212) at both ends, and sliding block (211) is positioned close to the positioning ring of clump weight (12)
(212) on, the positioning ring (212) close to carriage (13) is fixedly connected with third bracket (29), and two positioning rings (212) are opposite
Side respectively corresponds hinged several connecting rods (213), and corresponding connecting rod (213) is hinged；The positioning ring of sliding block (211) is set
(212) the vertical uniform several telescopic rods (214) of setting in side, telescopic rod (214) are connect with controller (24), telescopic rod
(214) both ends are connect with positioning ring (212) and corresponding first support (27) or second support (28) respectively.
2. elevator rope detection device according to claim 1, which is characterized in that power supply (22) and steady wheel (14) or rope
Connection Time relay (26) on the conducting wire of (11) connection is taken turns, the time relay (26) is arranged on platform (20), time relay
Device (26) and controller (24) connection.
3. elevator rope detection device according to claim 1, which is characterized in that between the connecting rod (213) being hinged
Angular range be 165 ° to 175 ° between.
4. elevator rope detection device according to claim 3, which is characterized in that the end for the connecting rod (213) being hinged
Head is respectively provided with anti-skidding cambered surface (215), and non-slip texture is arranged on anti-skidding cambered surface (215).
5. elevator rope detection device according to claim 1, which is characterized in that detection pipe (21) is close to clump weight (12)
Positioning ring (212) in two hydraulic stems (216) of diametrically opposite setting, the extension end of hydraulic stem (216) is towards positioning ring
(212), through-hole is arranged in the extension end of positioning ring (212) corresponding hydraulic stem (216), hydraulic pump (217) is arranged on platform (20), liquid
By piping connection, hydraulic pump (217) is connect with controller (24) for press pump (217) and hydraulic stem (216).
6. elevator rope detection device according to claim 5, which is characterized in that the positioning ring close to carriage (13)
(212) opposite rope sheave (11) perhaps above steady wheel (14) setting anti-drop block (15) anti-drop block (15) and rope sheave (11) or
The opposite side of steady wheel (14) opens up slot, and anti-drop block (15) is connect with platform (20) by the 4th bracket (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810316195.9A CN108439141B (en) | 2018-04-10 | 2018-04-10 | Elevator rope detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810316195.9A CN108439141B (en) | 2018-04-10 | 2018-04-10 | Elevator rope detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108439141A CN108439141A (en) | 2018-08-24 |
| CN108439141B true CN108439141B (en) | 2019-08-23 |
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ID=63199546
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810316195.9A Active CN108439141B (en) | 2018-04-10 | 2018-04-10 | Elevator rope detection device |
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| CN (1) | CN108439141B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109969908A (en) * | 2019-03-18 | 2019-07-05 | 北京市环宇电梯工程有限公司 | A kind of the hoist cable fracture of wire check device and inspection method of elevator |
| CN110228740B (en) * | 2019-07-09 | 2024-03-19 | 闽江学院 | Elevator wire rope security performance detection device |
| CN111986835B (en) * | 2020-07-02 | 2022-03-22 | 湖南力通恒裕电缆科技有限公司 | Branch cable with alarm module |
| CN114074887B (en) * | 2021-11-11 | 2023-10-31 | 上海电机学院 | Automatic timing monitoring system for elevator dragging steel wire rope |
| CN114295547B (en) * | 2021-12-31 | 2022-09-20 | 诸暨市海纳特钢有限公司 | Self-breaking detection device used after heat treatment of high-strength steel wire |
| CN115028095A (en) * | 2022-08-11 | 2022-09-09 | 杭州未名信科科技有限公司 | Intelligent robot for tower crane maintenance and intelligent tower crane |
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| CN206172710U (en) * | 2016-11-22 | 2017-05-17 | 奥特朗博电梯有限公司 | Intelligent elevator with disconnected gang detection mechanism of wire rope |
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| CN201309995Y (en) * | 2009-03-13 | 2009-09-16 | 湖北福星科技股份有限公司 | Steel cord broken wire detector |
| CN102897625A (en) * | 2012-10-30 | 2013-01-30 | 吴江信谊精密五金有限公司 | Elevator traction steel wire rope fracture detecting device |
| CN202880606U (en) * | 2012-11-16 | 2013-04-17 | 深圳市中航楼宇科技有限公司 | Elevator dragging steel wire rope strand-breakage monitoring device |
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| CN206172710U (en) * | 2016-11-22 | 2017-05-17 | 奥特朗博电梯有限公司 | Intelligent elevator with disconnected gang detection mechanism of wire rope |
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|---|---|
| CN108439141A (en) | 2018-08-24 |
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