阅读说明：本技术 一种斜井串车防漏插插销检测装置及方法 (Device and method for detecting anti-missing inserted pins of inclined shaft string car ) 是由 黄敏 于 2021-09-24 设计创作，主要内容包括：本发明公开了一种斜井串车防漏插插销检测装置及方法,其中装置包括：推车爪,设置于导轨上；液压动力系统,与推车爪传动连接,用于驱使推车爪前后移动；压力传感器,设置于液压动力系统上,用于检测液压动力系统的压力值；编码器,设置于液压动力系统上,用于检测推车爪的位移；阻车器,设置于导轨中间,且位于推车爪远离卷扬机的一侧；控制系统,与液压动力系统、压力传感器、编码器、阻车器电连接,用于控制液压动力系统及阻车器动作,以及接收压力传感器采集的压力值和编码器采集的位移。可实现插销漏插自动检测,防止斜井串车插销漏插,防止发生斜井跑车事故发生。(The invention discloses a device and a method for detecting an anti-missing plug pin of an inclined shaft train, wherein the device comprises: the trolley claw is arranged on the guide rail; the hydraulic power system is in transmission connection with the cart claw and is used for driving the cart claw to move back and forth; the pressure sensor is arranged on the hydraulic power system and used for detecting the pressure value of the hydraulic power system; the encoder is arranged on the hydraulic power system and used for detecting the displacement of the trolley claw; the car arrester is arranged in the middle of the guide rail and is positioned on one side of the cart claw, which is far away from the winch; and the control system is electrically connected with the hydraulic power system, the pressure sensor, the encoder and the car arrester and is used for controlling the hydraulic power system and the car arrester to act and receiving the pressure value acquired by the pressure sensor and the displacement acquired by the encoder. Can realize that the bolt leaks to insert automated inspection, prevent that inclined shaft cluster car bolt from leaking and inserting, prevent to take place inclined shaft sports car occurence of failure.)

1. The utility model provides a slope cluster car leak protection inserts bolt detection device which characterized in that includes:

the trolley claw is arranged on the guide rail;

the hydraulic power system is in transmission connection with the trolley claws and is used for driving the trolley claws to move back and forth;

the pressure sensor is arranged on the hydraulic power system and used for detecting the pressure value of the hydraulic power system;

the encoder is arranged on the hydraulic power system and used for detecting the displacement of the trolley claw;

the car arrester is arranged in the middle of the guide rail and is positioned on one side of the cart claw, which is far away from the winch;

and the control system is electrically connected with the hydraulic power system, the pressure sensor, the encoder and the car arrester and is used for controlling the actions of the hydraulic power system and the car arrester and receiving the pressure value acquired by the pressure sensor and the displacement acquired by the encoder.

2. The device for detecting the plug-in leakage prevention of the skewer bunching in the inclined shaft as claimed in claim 1, wherein the hydraulic power system comprises a hydraulic station, a hydraulic motor, a gearbox, a wire rope reel, a forward wire rope, a backward wire rope, a first guide pulley block and a second guide pulley block;

the hydraulic station is communicated with the hydraulic motor through a pipeline; the gearbox is connected with an output shaft of the hydraulic motor, and the wire rope reel is connected with an output shaft of the gearbox; one end of the advancing steel wire rope is connected with the front end of the trolley claw, and the other end of the advancing steel wire rope penetrates through the first guide pulley block and then is wound on the steel wire rope winding drum; one end of the retreating steel wire rope is connected with the rear end of the trolley claw, and the other end of the retreating steel wire rope penetrates through the second wire pulley block and then is wound on the steel wire rope winding drum;

the encoder is installed on the rotating shaft of the steel wire rope winding drum, and the pressure sensor is installed on the hydraulic station.

3. The device for detecting the plug pin for preventing the car from being inserted in the inclined shaft from bunching according to claim 2, wherein the first guide pulley block and the second guide pulley block respectively comprise a first pulley, a second pulley and a third pulley, the first pulley is arranged on one side of the guide rail and corresponds to the steel wire rope reel, the second pulley and the third pulley are arranged on the front side or the rear side of the cart claw, the second pulley and the third pulley are arranged on the outer side and the middle of the guide rail relatively, and the second pulley and the first pulley are positioned on the same side of the guide rail.

4. The device of claim 1, wherein the control system is further electrically connected to a winch control system.

5. The device for detecting the plug pin for preventing the plug pin from being inserted in the deviated well from the running of the vehicle as claimed in any one of claims 1 to 4, wherein the control system is used for judging whether the plug pin is inserted in a missing manner according to the received pressure value and displacement, and specifically comprises:

when the pressure value is greater than or equal to the preset pressure value and the displacement is less than or equal to the preset displacement value, judging that the plug pin is not missed;

otherwise, judging that the plug is missed to insert.

6. The device of claim 1, wherein the control system is further configured to obtain a duration of time during which the pressure sensor collects a pressure value greater than or equal to a predetermined pressure value.

7. The device for detecting the plug pins in the inclined shaft crossing car leakage prevention device according to claim 6, wherein the control system is used for judging whether the plug pins are plugged in the inclined shaft crossing car leakage prevention device according to the received pressure value, the duration time when the pressure value reaches or exceeds the preset pressure value and the displacement, and specifically comprises:

when the pressure value is greater than or equal to a preset pressure value, the duration time of the pressure value is greater than or equal to preset time, and the displacement is less than or equal to a preset displacement value, judging that the plug pin is not missed;

otherwise, judging that the plug is missed to insert.

8. A method for detecting the anti-missing inserted pins of a deviated well bunching car is characterized in that the device for detecting the anti-missing inserted pins of the deviated well bunching car as claimed in any one of claims 1 to 7 is used for detection, and specifically comprises the following steps:

parking the tandem car on an inclined shaft tandem car anti-missing plug detection device;

the winch sends a signal of lowering and stringing cars, and the inclined shaft stringing cars and the anti-missing plug pin detection device immediately detects the signals;

the plug pin leakage prevention detection device for the inclined shaft tandem car detects whether plug pin leakage exists, if the plug pin leakage does not exist, the result is fed back to a winch control system to lower the tandem car, and the car arrester is controlled to be opened; and if the missing insertion exists, feeding the result back to a winch control system to stop the car descending and bunching, and controlling to close the car arrester.

Technical Field

The invention relates to the technical field of inclined shaft safety operation, in particular to an inclined shaft bunching anti-missing plug pin detection device and method.

Background

The inclined shaft bunching is a transportation tool for underground operation, and adjacent carriages are connected through a bunching chain and a bolt. And the last carriage of the tandem train is fixedly connected with a hoisting steel wire of a hoisting machine through a bolt, and the hoisting machine provides power to control the movement of the tandem train. However, the inclined shaft bunching lifting has a very large potential safety hazard, namely, the situation that a hitcher forgets to insert a bolt to directly push the mine car down the inclined shaft when the bunching is lowered, so that a car running accident is caused. At present, the automatic check is mainly carried out when a hooking worker inserts the plug pin, but the problem that the plug pin is forgotten to be inserted or the check is neglected cannot be avoided.

Disclosure of Invention

The invention provides a device and a method for detecting an anti-missing plug pin of a tandem car of an inclined shaft, which are used for solving the problem of car running accidents caused by the fact that a hitcher forgets to plug the plug pin when the tandem car is lowered.

In a first aspect, a device for detecting the missing-proof plug of a deviated well string car is provided, which comprises:

the trolley claw is arranged on the guide rail;

the hydraulic power system is in transmission connection with the trolley claws and is used for driving the trolley claws to move back and forth;

the pressure sensor is arranged on the hydraulic power system and used for detecting the pressure value of the hydraulic power system;

the encoder is arranged on the hydraulic power system and used for detecting the displacement of the trolley claw;

the car arrester is arranged in the middle of the guide rail and is positioned on one side of the cart claw, which is far away from the winch;

and the control system is electrically connected with the hydraulic power system, the pressure sensor, the encoder and the car arrester and is used for controlling the actions of the hydraulic power system and the car arrester and receiving the pressure value acquired by the pressure sensor and the displacement acquired by the encoder.

When the detection device works, firstly, the control system controls the hydraulic power system to work, then the cart claw is driven to move to the first section of carriage of the tandem vehicle and provide thrust for the first section of carriage, meanwhile, the pressure sensor detects the hydraulic oil pressure value of the hydraulic power system and transmits the result to the control system in real time, the encoder detects the displacement of the cart claw and transmits the result to the control system in real time, and finally, the control system judges whether the plug pin is inserted in a leakage mode according to the detected hydraulic oil pressure value and the displacement. If the missed insertion is judged not to exist, the control system controls the car arrester to be opened, and the car is allowed to be crossed and transferred; otherwise, the control system controls to close the car arrester to prevent the car from being mixed and transferred, so that automatic detection of plug missing insertion is realized, and car running accidents are prevented.

Further, the hydraulic power system comprises a hydraulic station, a hydraulic motor, a gearbox, a wire rope reel, a forward wire rope, a backward wire rope, a first guide pulley block and a second guide pulley block;

the hydraulic station is communicated with the hydraulic motor through a pipeline; the gearbox is connected with an output shaft of the hydraulic motor, and the wire rope reel is connected with an output shaft of the gearbox; one end of the advancing steel wire rope is connected with the front end of the trolley claw, and the other end of the advancing steel wire rope penetrates through the first guide pulley block and then is wound on the steel wire rope winding drum; one end of the retreating steel wire rope is connected with the rear end of the trolley claw, and the other end of the retreating steel wire rope penetrates through the second wire pulley block and then is wound on the steel wire rope winding drum;

the encoder is installed on the rotating shaft of the steel wire rope winding drum, and the pressure sensor is installed on the hydraulic station.

Further, first direction assembly pulley and second direction assembly pulley all include first pulley, second pulley and third pulley, first pulley set up in guide rail one side and corresponding the wire rope reel, second pulley, third pulley all set up in shallow front side or rear side of claw, just second pulley, third pulley set up relatively in the outside and the centre of guide rail, the second pulley with first pulley is located same one side of guide rail.

Further, the control system is also electrically connected with the winch control system.

Further, the control system is used for judging whether the bolt is missed to insert according to the received pressure value and the displacement, and specifically comprises:

when the pressure value is greater than or equal to the preset pressure value and the displacement is less than or equal to the preset displacement value, judging that the plug pin is not missed;

otherwise, judging that the plug is missed to insert.

Further, the control system is also used for acquiring the duration of the pressure value acquired by the pressure sensor, wherein the pressure value is greater than or equal to the preset pressure value. In order to make the detection result more accurate, the control system also acquires whether the duration of the pressure sensor acquiring the pressure value reaching or exceeding the preset pressure value exceeds the preset time, namely the pressure does not drop within the set time as a necessary condition for no missing insertion.

Further, control system is used for judging whether have the bolt to leak and insert according to the duration and the displacement that received pressure value, pressure value reached or exceeded preset pressure value, specifically includes:

when the pressure value is greater than or equal to a preset pressure value, the duration time of the pressure value is greater than or equal to preset time, and the displacement is less than or equal to a preset displacement value, judging that the plug pin is not missed;

otherwise, judging that the plug is missed to insert.

In a second aspect, a method for detecting a missing-proof plug of a tandem inclined shaft is provided, which uses the device for detecting the missing-proof plug of the tandem inclined shaft to detect, and specifically includes:

parking the tandem car on an inclined shaft tandem car anti-missing plug detection device;

the winch sends a signal of lowering and stringing cars, and the inclined shaft stringing cars and the anti-missing plug pin detection device immediately detects the signals;

the plug pin leakage prevention detection device for the inclined shaft tandem car detects whether plug pin leakage exists, if the plug pin leakage does not exist, the result is fed back to a winch control system to lower the tandem car, and the car arrester is controlled to be opened; and if the missing insertion exists, feeding the result back to a winch control system to stop the car descending and bunching, and controlling to close the car arrester.

Advantageous effects

The invention provides a device and a method for detecting an anti-missing plug of a tandem of an inclined shaft. If the missed insertion is judged not to exist, the control system controls the car arrester to be opened, and the car is allowed to be crossed and transferred; otherwise, the control system controls to close the car arrester to prevent the train from descending. Thereby realize the bolt and leak and insert automated inspection, prevent that inclined shaft cluster car bolt from leaking and inserting to prevent to cause the sports car accident.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of an anti-missing plug detection device for a deviated well crossing provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of the principles provided by an embodiment of the present invention;

FIG. 3 is a schematic control principle and flow chart of the anti-missing plug detection device for the inclined shaft bunching provided by the embodiment of the invention;

fig. 4 is an installation schematic diagram of the inclined shaft bunching anti-missing plug pin detection device, the bunching and the winch provided by the embodiment of the invention.

In the figure: 1. a control system; 2. a hydraulic station; 3. a pressure sensor; 4. a hydraulic motor; 5. a gearbox; 6. a wire rope drum; 7. an encoder; 8. a forward wire rope; 9. backing the steel wire rope; 10. a first guide pulley block; 11. a trolley claw; 12. a guide rail; 13. a car arrester; 14. and the second guide pulley block.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "center", "longitudinal", "lateral", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

It is noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not intended to indicate or imply relative importance or order. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.

As shown in fig. 1 and 4, an embodiment of the present invention provides a device for detecting an anti-missing plug of a deviated well crossing, including:

a trolley claw 11 arranged on the guide rail 12;

the hydraulic power system is in transmission connection with the trolley claws 11 and is used for driving the trolley claws 11 to move back and forth;

the pressure sensor 3 is arranged on the hydraulic power system and used for detecting the pressure value of the hydraulic power system;

the encoder 7 is arranged on the hydraulic power system and used for detecting the displacement of the cart claw 11;

the car arrester 13 is arranged in the middle of the guide rail 12 and is positioned on one side of the cart claw 11, which is far away from the winch;

and the control system 1 is electrically connected with the hydraulic power system, the pressure sensor 3, the encoder 7 and the car arrester 13 and is used for controlling the hydraulic power system and the car arrester 13 to act and receiving the pressure value acquired by the pressure sensor 3 and the displacement acquired by the encoder 7.

When the detection device works, firstly, the control system 1 controls the hydraulic power system to work, then the cart claw 11 is driven to move to the first section of carriage of the tandem vehicle and provides thrust for the first section of carriage, meanwhile, the pressure sensor 3 detects the hydraulic oil pressure value of the hydraulic power system and transmits the result to the control system 1 in real time, the encoder 7 detects the displacement of the cart claw 11 and transmits the result to the control system 1 in real time, and finally, whether the plug pin is inserted in a leakage mode is judged by the control system 1 according to the detected hydraulic oil pressure value and the displacement. If the plugging is not missed, the control system 1 controls the car arrester 13 to be opened, and the car is allowed to be crossed and released; otherwise, the control system 1 controls to close the car arrester 13 to prevent the car from being mixed and transferred, so that automatic detection of plug missing insertion is realized, and car running accidents are prevented.

Specifically, the hydraulic power system comprises a hydraulic station 2, a hydraulic motor 4, a gearbox 5, a steel wire rope reel 6, a forward steel wire rope 8, a backward steel wire rope 9, a first guide pulley block 10 and a second guide pulley block 14;

the hydraulic station 2 is communicated with the hydraulic motor 4 through a pipeline; the gearbox 5 is connected with an output shaft of the hydraulic motor 4, and the steel wire rope reel 6 is connected with the output shaft of the gearbox 5; one end of the advancing steel wire rope 8 is connected with the front end of the trolley claw 11, and the other end of the advancing steel wire rope passes through the first guide pulley block 10 and then is wound on the steel wire rope winding drum 6; one end of the retreating steel wire rope 9 is connected with the rear end of the trolley claw 11, and the other end of the retreating steel wire rope penetrates through the second wire pulley block and then is wound on the steel wire rope winding drum 6;

the encoder 7 is installed on a rotating shaft of the steel wire rope reel 6, and the pressure sensor 3 is installed on the hydraulic station 2.

More specifically, first direction assembly pulley 10 and second direction assembly pulley 14 all include first pulley, second pulley and third pulley, first pulley set up in guide rail 12 one side just corresponds wire rope reel 6, second pulley, third pulley all set up in shallow front side or rear side of claw 11, just second pulley, third pulley set up relatively in the outside and the centre of guide rail 12, the second pulley with first pulley is located same one side of guide rail 12.

In this embodiment, the control system 1 is further electrically connected to a winch control system. When the winch control system sends a signal of lowering and stringing cars, the control system 1 receives the signal and controls the inclined shaft stringing car releasing, leaking and inserting bolt detection device to perform releasing, leaking and inserting detection, and feeds back a detection result to the winch control system so as to control whether the winch control system continues to lower and string cars or not.

In this embodiment, the control system 1 is configured to determine whether there is a missing plug of the plug pin according to the received pressure value and the displacement, and specifically includes:

when the pressure value is greater than or equal to the preset pressure value and the displacement is less than or equal to the preset displacement value, judging that the plug pin is not missed;

otherwise, judging that the plug is missed to insert.

In a preferred embodiment, in order to make the detection result more accurate, the control system 1 is further configured to obtain a duration of time for which the pressure sensor 3 acquires the pressure value greater than or equal to a preset pressure value. The control system 1 also obtains whether the duration of the pressure sensor 3 acquiring the pressure value reaching or exceeding the preset pressure value exceeds the preset time, i.e. the pressure does not drop in the set time as a necessary condition for no missing insertion.

In this embodiment, the control system 1 is configured to determine whether there is a missing plug of the plug pin according to the received pressure value, the duration and the displacement of the pressure value reaching or exceeding the preset pressure value, and specifically includes:

when the pressure value is greater than or equal to a preset pressure value, the duration time of the pressure value is greater than or equal to preset time, and the displacement is less than or equal to a preset displacement value, judging that the plug pin is not missed;

otherwise, judging that the plug is missed to insert.

In which, regarding the pressure value being greater than or equal to the preset pressure value holding time, the following description will be made with reference to an example. Example (c): suppose thatThe hydraulic station 2 provides pressure P which is 10Mpa to normally push the tandem vehicle to move forward, and a minimum pressure value P is set for the control system 1 according to the value_min11Mpa (which is larger than 10Mpa and why is larger than 10 Mpa; the control system 1 is then also set a minimum pressure hold time T_minLet T be_min5S. According to these two judgment values, only after the pressure of the hydraulic station 2 reached 11Mpa and the hydraulic station 2 was operated for 5 seconds, the pressure value P was detected_Measuring≥P_min(ii) a In this case it is possible for the control system 1 to determine that there is no missing plug (there is also a displacement value to determine).

In order to facilitate further understanding of the technical solution of the present invention, the following describes an implementation principle of the technical solution of the present invention.

Before the serial cars are placed down, the situation that the pins of the serial car chain are inserted in a leakage way is assumed. If a forward pushing force F is applied to the tandem at this time_{Push away}When F is_{Push away}＞F_{Massage device}In time, the tandem car can move forward. According to this basic principle, only a forward pushing force F is applied to the carriage_{Push away}And ensure F_{Push away}＞F_{Massage device}If the tandem vehicle moves forwards, the chain bolt is judged to be inserted in a leakage way, and if the tandem vehicle does not move, the chain bolt is judged to be inserted in a leakage way.

Taking a tandem car including two cars as an example, fig. 2(a), (b), (c), and (d) show four possible displacement situations.

In fig. 2(a), the chain plug of the tandem chain between the carriages No. 1 and No. 2 is inserted without leakage, and the chain plug of the tandem chain is inserted with the hoisting rope of the hoisting machine, when F_{Push away}＞F_{Massage device}In time, the tandem vehicle whole body can move forwards.

In fig. 2(b), the chain plug of the tandem chain between the carriages No. 1 and No. 2 is inserted in a leakage way, and the chain plug of the tandem chain and the hoisting rope of the hoisting machine are not inserted in a leakage way, when F_{Push away}＞F_{Massage 1}In the meantime, the 1# car moves forward, and the 2# car does not move.

No-leakage insertion of the chain plug pin between the 1# and 2# carriages in FIG. 2(c), and the chain plug pin and the hoisting rope of the hoisting machineWithout the insertion leakage. When F is present_{Push away}＞F_{Massage device}In time, the tandem car is also subjected to the traction force F of the hoisting machine for hoisting the steel wire rope_{Traction device}Due to F_{Traction device}＞F_{Push away}＞F_{Massage device}So the train will not move (if F)_{Push away}＞F_{Traction device}The hoisting ropes break, which is not possible).

In fig. 2(d), the chain plug is inserted between the carriages No. 1 and No. 2, and the chain plug is inserted between the chain and the hoisting rope of the hoisting machine, when F_{Push away}＞F_{Massage device}In the meantime, the 1# car moves forward, and the 2# car does not move.

Based on the device for detecting the anti-leakage plug of the deviated well crossing, the embodiment of the invention also provides a method for detecting the anti-leakage plug of the deviated well crossing, which specifically comprises the following steps:

parking the tandem car on an inclined shaft tandem car anti-missing plug detection device;

the winch sends a signal of lowering and stringing cars, and the inclined shaft stringing cars and the anti-missing plug pin detection device immediately detects the signals;

the inclined shaft train crossing anti-missing plug pin detection device detects whether plug pin missing insertion exists, if the plug pin missing insertion does not exist, the result is fed back to a winch control system to lower the train crossing, and the car arrester 13 is controlled to be opened; and if the missing insertion exists, feeding the result back to the winch control system to stop the car descending and bunching, and controlling to close the car arrester 13.

Specifically, fig. 3(a) is a schematic control principle and a schematic flow chart of the anti-missing plug detection device for the deviated well crossing in the case of no plug missing. The winch control system sends a train lowering and stringing signal to a control system 1 (namely a detection device PLC control system in the figure) of the detection device, the detection device PLC control system sends a hydraulic power system starting instruction to a hydraulic power system, the hydraulic power system transmits power to a trolley claw 11, and the trolley claw 11 applies pushing force to a first carriage of a train to push the train; at the moment, the encoder 7 detects the displacement of the trolley claw 11 and transmits the displacement to the detection device PLC control system, meanwhile, the pressure sensor 3 detects the hydraulic oil pressure value of the hydraulic power system and uploads the hydraulic oil pressure value to the detection device PLC control system in real time, if three conditions that the displacement of the trolley claw 11 is smaller than or equal to a preset displacement value (Max set value), the pressure value is larger than or equal to a preset pressure value (Min set pressure value), the duration time of the pressure value reaching or exceeding the preset pressure value is larger than or equal to preset time (Min set time) are met simultaneously, the detection device PLC control system judges that the tandem plug pin is not inserted in a leakage mode, an opening signal is sent to the car arrester 13, a signal that the tandem car can be placed is sent to the winch control system, the car arrester 13 is opened after receiving the signal, the tandem car is not blocked any more, and the winch control system executes the operation of placing the tandem car after receiving the signal.

Fig. 3(b) is a schematic control principle and flow diagram of the anti-missing plug detection device for the deviated well crossing in the case of the missing plug. The winch control system sends a train lowering and stringing signal to a control system 1 (namely a detection device PLC control system in the figure) of the detection device, the detection device PLC control system sends a hydraulic power system starting instruction to a hydraulic power system, the hydraulic power system transmits power to a trolley claw 11, and the trolley claw 11 applies pushing force to a first carriage of a train to push the train; at this time, the encoder 7 detects the displacement of the cart claw 11 and transmits the displacement to the detection device PLC control system, meanwhile, the pressure sensor 3 detects the hydraulic oil pressure value of the hydraulic power system and uploads the hydraulic oil pressure value to the detection device PLC control system in real time, if one or more of the three conditions that the displacement of the cart claw 11 is larger than a preset displacement value (Max set value), the pressure value is smaller than a preset pressure value (Min set pressure value), and the duration of the pressure value reaching or exceeding the preset pressure value is smaller than a preset time (Min set time) are met, the detection device PLC control system judges that the tandem plug pin is inserted in a missing way, sends a closing signal to the car arrester 13, sends a signal for stopping the lowering of the tandem to the winch control system, the car arrester 13 keeps closing after receiving the signal, the control system of the winch stops the lowering of the tandem cars after receiving the signal and gives out acousto-optic alarm.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.