A system and method for monitoring the condition of dumbbell pins on the coal wall side of a scraper conveyor.

Abstract

This invention provides a system and method for monitoring the status of dumbbell pins on the coal face of a scraper conveyor, belonging to the technical field of underground scraper conveyors in mining. The system includes: a coal mining machine equipped with a RFID reader, a scraper conveyor equipped with passive RFID tags, and a host computer mounted on the scraper conveyor. The RFID reader and the host computer are wirelessly connected. During coal mining, the coal mining machine reciprocates on the central trough of the scraper conveyor via a smooth shoe. When passing the dumbbell pins, the RFID reader receives the sensing signals from the passive RFID tags in real time. The RFID reader outputs the RFID radio frequency tag information corresponding to the passive RFID tag and the induced current intensity signal to the host computer. The host computer determines whether the scraper conveyor has experienced dumbbell pin detachment or breakage based on the RFID radio frequency tag information and the induced current intensity signal.

Description

Technical Field

[0001] This invention relates to the field of underground scraper conveyors in mining, and in particular to a system and method for monitoring the status of dumbbell pins on the coal wall side of a scraper conveyor. Background Technology

[0002] In underground fully mechanized mining faces, the central troughs of the scraper conveyor are connected by dumbbell pins. During coal mining, as the coal mining machine advances, hydraulic supports need to push the central troughs of the scraper conveyor. During this pushing process, the dumbbell pins bear enormous impact loads, and excessive tension can easily cause wear and breakage of the dumbbell pins. If a dumbbell pin breaks or its locking mechanism or spring pin fails, causing it to fall off, it will directly lead to misalignment or disassembly of the central trough connection, triggering a chain reaction that affects normal production at the working face and may even paralyze the entire coal mining system, seriously impacting coal mine production efficiency and safety. Therefore, it is necessary to replace damaged dumbbell pins promptly to avoid further safety hazards.

[0003] Currently, most mines in China still use the traditional manual inspection method to check for broken or detached dumbbell pins. Since the dumbbell pins on the coal face are located directly in front of the coal face and are often covered by loose coal, it is necessary to manually clean up the loose coal before confirming whether the dumbbell pins are properly connected. This can easily cause the coal face to deviate, making the operation dangerous for workers. Moreover, the large number of dumbbell pins makes the inspection workload heavy, resulting in extremely low efficiency and high safety hazards due to the manual inspection and maintenance method. Summary of the Invention

[0004] In view of this, the present invention provides a coal wall side dumbbell pin condition monitoring system and method for scraper conveyors, which automates the maintenance of dumbbell pins, has the characteristics of high maintenance efficiency, and can improve maintenance efficiency.

[0005] The technical solution adopted by the embodiments of the present invention to solve its technical problem is as follows:

[0006] A coal wall side dumbbell pin status monitoring system for a scraper conveyor includes: a coal mining machine equipped with an RFID reader (1), a scraper conveyor equipped with a passive RFID tag (2), and a host computer installed on the scraper conveyor. The RFID reader (1) and the host computer are connected wirelessly. During the coal mining process, the coal mining machine travels back and forth on the middle trough of the scraper conveyor via a smooth shoe. When passing the dumbbell pin, the RFID reader (1) receives the sensing signal from the passive RFID tag (2) in real time. The RFID reader (1) outputs the RFID radio frequency tag information corresponding to the passive RFID tag (2) and the sensing current intensity signal to the host computer. The host computer determines whether the scraper conveyor has dumbbell pin detachment or dumbbell pin cracks based on the RFID radio frequency tag information and the sensing current intensity signal.

[0007] Preferably, the dumbbell pin is installed in the dumbbell pin seat of two adjacent middle slots in the scraper conveyor. The dumbbell pin has a column and two positioning blocks connected to both ends of the column. The outer surface of the positioning block has a groove for placing a label. The passive RFID identification label (2) is installed in the groove of the positioning block.

[0008] On the coal mining side, N dumbbell pins are sequentially installed on the scraper conveyor, and correspondingly, 2N passive FRID identification tags (2) are sequentially installed. Each passive FRID identification tag (2) has unique FRID radio frequency tag information, and the same dumbbell pin number corresponds to 2 passive FRID identification tags (2).

[0009] The coal mining machine's outriggers are connected to the smooth boot via a pin. The FRID reader (1) is installed on the end face of the pin, wherein there is a groove on the end face facing the dumbbell pin, and the FRID reader (1) is installed in the groove.

[0010] On the coal mining side, the coal mining machine has two smooth shoes, and correspondingly, two pins and two FRID readers (1);

[0011] The FRID reader has a wireless module for establishing wireless communication connections.

[0012] Preferably, the minimum horizontal distance between the FRID reader (1) and the passive FRID sensing tag (2) is L1; the FRID system uses a low-frequency operating frequency, and the sensing distance between the FRID reader (1) and each of the passive FRID sensing tags (2) is L1;

[0013] The horizontal distance between the two passive RFID tags (2) located on the same dumbbell pin is L2;

[0014] The length of a single central groove is L3;

[0015] The horizontal distance between the two FRID readers (1) on the coal mining machine is L4.

[0016] Preferably, the host computer includes a data analysis module, a data storage module, a data upload module, and an alarm notification module.

[0017] The data storage module is used to store the information transmitted by the passive RFID tag (2);

[0018] The data analysis module is used to monitor the status of dumbbell pins based on the data stored in the data storage module; when it is found that there is a crack in the dumbbell pin, it sends a crack warning signal to the alarm warning module; when it is found that there is a missing dumbbell pin, it sends a missing warning signal to the alarm warning module.

[0019] The alarm module is used to activate the audible and visual alarm device to provide an alarm prompt after receiving the crack warning signal or the loss warning signal.

[0020] The data upload module is used to establish a communication connection with the underground communication system of the coal mine, and to transmit the dumbbell pin status monitoring data to the coal mine monitoring center through the underground communication system, so that the coal mine monitoring center dispatchers can install new dumbbell pins in a timely manner and avoid the dumbbell pins falling off, which would cause the central slot connection to become misaligned or disconnected.

[0021] Preferably, after the initial installation of the dumbbell pin status monitoring system for the scraper conveyor, the coal mining machine is started from the starting position and travels back and forth on the scraper conveyor once at a preset travel speed V. The host computer stores a set of RFID radio frequency tag information collected by the two RFID readers (1) and the induced current intensity signal Q. n Based on the travel speed V, the FRID radio frequency tag information sequence, and the FRID radio frequency tag information reception time t n Establish the location information of the FRID radio frequency tag information, and establish the FRID radio frequency tag information and the induced current intensity signal Q according to the receiving order of the FRID radio frequency tag information. n The correspondence between the number of the dumbbell pins and the induced current intensity signal Q is determined. n As the theoretical value of the nth induced current intensity; the theoretical value of the induced current intensity Q nThe location information of the RFID tag information and the corresponding relationship data are both used as reference data for comparison.

[0022] In actual operation, the host computer, based on the reference data, determines whether there is a missing dumbbell pin according to the received RFID tag information, and determines whether there is a crack in the dumbbell pin according to the received induced current intensity signal.

[0023] The host computer directly determines the missing passive FRID sensing tag (2) based on the reference data and the real-time FRID radio frequency tag information sequence, and further confirms the dumbbell pin number corresponding to the detached dumbbell pin based on the missing passive FRID sensing tag information.

[0024] The host computer calculates a reference variable R% based on the real-time induced current intensity signal. When R% is greater than a first preset threshold, it indicates that the position of the positioning blocks at both ends of the dumbbell pin corresponding to the real-time induced current intensity signal has changed, deflection has occurred, or cracks have appeared.

[0025] R% = |Q n -P n | / Q n

[0026] Among them, P n To monitor the real-time induced current intensity obtained from the current tag.

[0027] Preferably, the first preset threshold is 5%.

[0028] This invention also provides a method for monitoring the status of dumbbell pins on the coal wall side of a scraper conveyor. The implementing entity is the aforementioned monitoring system for the status of dumbbell pins on the coal wall side of a scraper conveyor, and the steps include:

[0029] Step S1: Record the initial operating data of the system and establish baseline data. Specifically, start the coal mining machine from the starting position and travel back and forth once on the scraper conveyor at a preset travel speed V. The host computer stores the RFID radio frequency tag information collected by the two RFID readers (1) and the induced current intensity signal Q. n Based on the travel speed V, the FRID RFID tag information sequence, and the FRID RFID tag information reception time t, the location information of the FRID RFID tag is established. Based on the FRID RFID tag information reception order, a correspondence is established between the FRID RFID tag information, the induced current intensity signal, and the dumbbell pin number. The induced current intensity signal Q... n As the theoretical value of the nth induced current intensity; the theoretical value of the induced current intensity Q nThe location information of the RFID tag information and the corresponding relationship data are both used as reference data for comparison.

[0030] Step S2: In actual operation, the host computer, based on the reference data, determines whether there is a missing dumbbell pin according to the received RFID tag information and whether there is a crack in the dumbbell pin according to the received induced current intensity signal.

[0031] Step S3: When it is confirmed that there is at least one of the following: dumbbell pin crack or dumbbell pin loss, the host computer will issue a real-time warning and transmit the dumbbell pin status monitoring data to the coal mine monitoring center through the underground coal mine communication system. This will enable the coal mine monitoring center to dispatch staff to install new dumbbell pins in a timely manner, so as to avoid the dumbbell pins falling off and causing misalignment or disconnection of the middle slot connection.

[0032] Preferably, step S2 includes:

[0033] The host computer directly determines the missing passive FRID sensor tag (2) based on the reference data and the real-time FRID radio frequency tag information sequence, and further confirms the dumbbell pin number corresponding to the detached dumbbell pin based on the missing passive FRID sensor tag (2).

[0034] Preferably, step S2 includes:

[0035] The host computer calculates a reference variable R% based on the real-time induced current intensity signal. When R% is greater than a first preset threshold, it indicates that the position of the positioning blocks at both ends of the dumbbell pin corresponding to the real-time induced current intensity signal has changed, deflection has occurred, or cracks have appeared.

[0036] R% = |Q n -P n | / Q n

[0037] Among them, P n To monitor the real-time induced current intensity obtained from the current tag;

[0038] Based on the passive FRID sensor tag (2) corresponding to the real-time induced current intensity signal where the reference variable value R% is higher than the preset threshold, and the corresponding dumbbell pin number, the location of the dumbbell pin with the crack is identified.

[0039] Preferably, the coal mining machine is equipped with a first FRID reader and a second FRID reader, and step S2 includes:

[0040] Step S21, the host computer receives the induced current intensity signal X collected at the same passive RFID tag location at time t and time t+Δt. n1 Xn2 , where X n1 From the first FRID reader, X n2 From the second FRID reader, where Δt = L4 / V;

[0041] Step S22, the host computer according to X n1 X n2 Calculate the reference variable S%.

[0042] S% = |X n1 -X n2 | / X n1

[0043] When S% is greater than the second preset threshold, it is confirmed that the dumbbell pin at the location of the passive RFID sensor tag has a crack, wherein the second preset threshold is less than the first preset threshold.

[0044] As can be seen from the above technical solution, the present invention provides a coal wall side dumbbell pin status monitoring system and method for scraper conveyors. The system includes: a coal mining machine equipped with an RFID reader, a scraper conveyor equipped with passive RFID tags, and a host computer installed on the scraper conveyor. The RFID reader and the host computer are wirelessly connected. During coal mining, the coal mining machine reciprocates on the middle trough of the scraper conveyor via a smooth shoe. When passing the dumbbell pins, the RFID reader receives the sensing signal from the passive RFID tags in real time. The RFID reader outputs the RFID radio frequency tag information corresponding to the passive RFID tags and the sensing current intensity signal to the host computer. The host computer determines whether there are dumbbell pin detachments or cracks in the scraper conveyor based on the RFID radio frequency tag information and the sensing current intensity signal. The solution of the present invention automates the dumbbell pin maintenance work, has the characteristics of high maintenance efficiency, improves maintenance efficiency, and has high feasibility. Attached Figure Description

[0045] Figure 1 This is a partial view of the main structure of the dumbbell pin condition monitoring system for the coal wall side of a scraper conveyor.

[0046] Figure 2 This is a partial schematic diagram of the right-hand side.

[0047] Figure 3 This is a schematic diagram of a dumbbell pin.

[0048] Figure 4 This is a schematic diagram of the dumbbell pin being installed in the middle slot.

[0049] Figure 5 Example diagram of the working process of the dumbbell pin status monitoring system for the coal wall side of a scraper conveyor. Detailed Implementation

[0050] The technical solution and effects of the present invention will be further described in detail below with reference to the accompanying drawings.

[0051] This invention improves the monitoring scheme for the dumbbell pin status at the connection point of the middle trough in a scraper conveyor, proposing an automated real-time monitoring scheme with alarm and information reporting functions.

[0052] like Figure 1-4 As shown, the present invention provides a dumbbell pin status monitoring system for the coal wall side of a scraper conveyor, including a scraper conveyor equipped with a passive FRID identification tag (2), a coal mining machine equipped with an FRID reader (1), and a host computer installed on the scraper conveyor. Specifically, the coal mining machine's support leg (41) and smooth shoe (42) are connected by a pin (43). The FRID reader (1) is installed on the end face of the pin (43), wherein there is a groove on the end face facing the dumbbell pin, and the FRID reader (1) is installed in the groove. The FRID reader has a wireless module for establishing a wireless communication connection, and the FRID reader (1) and the host computer are connected wirelessly. On the coal mining side, dumbbell pins (3) are installed in the dumbbell pin seats of two adjacent middle slots in the scraper conveyor, such as... Figure 3 As shown, the dumbbell pin (3) has a column and two positioning blocks connected to both ends of the column. Grooves for placing labels are formed on the outer surface of the positioning blocks, and a passive RFID tag (2) is installed in the groove of the positioning block; Figure 1 and Figure 4 As shown, on the coal mining side, N dumbbell pins are sequentially installed on the scraper conveyor, and correspondingly, 2N passive FRID identification tags (2) are sequentially installed. Each passive FRID identification tag (2) has unique FRID radio frequency tag information, and the same dumbbell pin number corresponds to 2 passive FRID identification tags (2); Figure 1 As shown, on the coal mining side, the coal mining machine has two smooth shoes (42) and correspondingly two pins (43), and each pin (43) is equipped with an FRID reader (1). During the coal mining process, the coal mining machine travels back and forth on the middle trough of the scraper conveyor through the smooth shoes (42). When passing the dumbbell pin, the FRID reader (1) receives the sensing signal of the passive FRID identification tag (2). The FRID reader (1) outputs the FRID radio frequency tag information corresponding to the passive FRID identification tag (2) and the sensing current intensity signal to the host computer. The host computer determines whether the scraper conveyor has dumbbell pin detachment or dumbbell pin cracks based on the FRID radio frequency tag information and the sensing current intensity signal.

[0053] Please refer to this as well. Figure 2The minimum horizontal distance between the FRID reader (1) and the passive FRID sensing tag (2) is L1; the FRID system uses a low-frequency operating frequency, and the sensing distance between the FRID reader (1) and each passive FRID sensing tag (2) is L1; the horizontal distance between two passive FRID identification tags (2) located on the same dumbbell pin is L2; ​​the length of a single central slot is L3 (which is also the horizontal distance between two adjacent dumbbell pins); the horizontal distance between the two FRID readers (1) on the coal mining machine is L4.

[0054] When the smooth shoe (42) of the coal mining machine passes the passive FRID induction tag (2) installed on the dumbbell pin (3), the passive FRID induction tag (2) generates an induced current in the loop antenna inside. The passive FRID induction tag sends out the passive FRID induction tag information (including tag number and dumbbell pin number) and induced current intensity signal through the transmitting antenna, and transmits it to the FRID reader through the antenna modulator.

[0055] The host computer includes a data analysis module, a data storage module, a data upload module, and an alarm notification module.

[0056] The data storage module is used to store the information transmitted by the passive RFID tag (2);

[0057] The data analysis module is used to monitor the status of the dumbbell pin based on the data stored in the data storage module; when it is found that there is a crack in the dumbbell pin, it sends a crack warning signal to the alarm module.

[0058] The alarm module is used to activate the audible and visual alarm device to provide an alarm notification upon receiving a crack warning signal.

[0059] The data upload module is used to establish a communication connection with the underground communication system of the coal mine, and to transmit the dumbbell pin status monitoring data to the coal mine monitoring center through the underground communication system, so that the dispatch staff of the coal mine monitoring center can install new dumbbell pins in a timely manner and avoid the dumbbell pins falling off, which would cause the central slot connection to become misaligned or disconnected.

[0060] You can refer to them together. Figure 5 Furthermore, the present invention provides a method based on Figure 1 The method for monitoring the status of dumbbell pins on the coal wall side of the scraper conveyor in the system shown includes the following steps:

[0061] Step S1: After the initial installation of the dumbbell pin status monitoring system for the scraper conveyor coal wall side is completed, the initial operating data of the system is recorded and the baseline data is established. Specifically, the coal mining machine is started from the starting position and travels back and forth on the scraper conveyor once at the preset travel speed V. The host computer stores the RFID radio frequency tag information collected by the two RFID readers (1) and the induced current intensity signal Q. nBased on the travel speed V, the FRID RFID tag information sequence, and the FRID RFID tag information reception time t, the location information of the FRID RFID tag is established. Based on the FRID RFID tag information reception order, a correspondence is established between the FRID RFID tag information, the induced current intensity signal, and the dumbbell pin number. The induced current intensity signal Q... n As the theoretical value of the nth induced current intensity; theoretical value of induced current intensity Q n The location information and corresponding relationship data of RFID tags are used as benchmark data for comparison.

[0062] Step S2: In the actual working process, the host computer determines whether there is a missing dumbbell pin based on the reference data and the received RFID tag information, and determines whether there is a crack in the dumbbell pin based on the received induced current intensity signal.

[0063] Step S3: When it is confirmed that there is at least one of the following: dumbbell pin crack or dumbbell pin loss, the host computer will issue a real-time warning and transmit the dumbbell pin status monitoring data to the coal mine monitoring center through the underground coal mine communication system. This will enable the coal mine monitoring center to dispatch staff to install new dumbbell pins in a timely manner, so as to avoid the dumbbell pins falling off and causing misalignment or disconnection of the middle slot connection.

[0064] As one implementation method, step S2 confirms that the dumbbell pin has fallen off due to a crack in the following ways:

[0065] The host computer directly identifies the missing passive FRID sensor tag (2) based on the reference data and the real-time FRID RFID tag information sequence. It further identifies the dumbbell pin number corresponding to the detached dumbbell pin based on the missing passive FRID sensor tag (2). If the FRID reader does not read the tag, it will directly result in the missing tag information in the real-time FRID RFID tag information sequence. By comparing the real-time FRID RFID tag information sequence with the FRID RFID tag information in the reference data according to the position information, it can be directly determined which tags are missing.

[0066] As one implementation method, step S2 confirms the dumbbell pin crack by including:

[0067] The host computer calculates a reference variable R% based on the real-time induced current intensity signal. When R% is greater than the first preset threshold, it indicates that the position of the positioning blocks at both ends of the dumbbell pin corresponding to the real-time induced current intensity signal has changed, deflection has occurred, or cracks have appeared.

[0068] R% = |Q n -P n | / Q n (1)

[0069] Among them, Pn To monitor the real-time induced current intensity obtained from the current tag;

[0070] Based on the passive FRID sensor tag (2) corresponding to the real-time induced current intensity signal where the reference variable value R% is higher than the preset threshold, and the corresponding dumbbell pin number, the location of the dumbbell pin with the crack is identified.

[0071] As one implementation method, step S2 confirms the dumbbell pin crack by including:

[0072] The coal mining machine is equipped with a first FRID reader and a second FRID reader. Step S2 includes:

[0073] Step S21: The host computer receives the induced current intensity signal X collected at the same passive RFID tag location at time t and time t+Δt. n1 X n2 , where X n1 From the first RFID reader, X n2 From the second FRID reader, where Δt = L4 / V;

[0074] Step S22, the host computer, according to X n1 X n2 Calculate the reference variable S%.

[0075] S% = |X n1 -X n2 | / X n1 (2)

[0076] When S% is greater than the second preset threshold, it is confirmed that the dumbbell pin at the location of the passive RFID sensor tag has a crack, wherein the second preset threshold is less than the first preset threshold.

[0077] Among the three dumbbell pin status judgment strategies above, the two schemes for judging the dumbbell pin loss situation and the dumbbell pin crack situation are parallel. The two schemes for judging the dumbbell pin crack situation can be executed one by one or in parallel.

[0078] In the above method, since the current intensity signals collected by the two RFID readers are basically the same after initial installation, the reference information can be obtained by directly merging the information collected by the first and second RFID readers. If the two current intensity information corresponding to the same tag are different, the average of the two current intensity values ​​can be taken as the theoretical value Q of the induced current intensity corresponding to that tag. n .

[0079] In the present invention, the first preset threshold can be set to 5%, and the second preset threshold can be set to 3%. The specific values ​​can be changed based on actual experiments and experience.

[0080] The following reference values ​​are given based on commonly used coal mining machines and scraper conveyors. For example, the FRID system uses a low-frequency operating frequency of 125kHz or 134.3kHz and the sensing distance is 30mm; the horizontal distance L2 between two passive FRID sensing tags (2) on the same dumbbell pin is 300mm; the horizontal distance L4 between two FRID readers (1) on the coal mining machine is 6000mm; the minimum horizontal distance L1 between the FRID reader (1) and the passive FRID sensing tag (2) is 30mm; and the horizontal distance L3 between adjacent dumbbell pins is 1750mm.

[0081] The FRID reader (1) is installed inside the pin end face of the smooth shoe part of the coal mining machine by means of bolts. It is easy to install and disassemble. The FRID reader (1) does not protrude from the pin end face and does not affect the pin's external dimensions, thus ensuring the normal coal mining process of the coal mining machine.

[0082] The passive FRID identification tag (2) is installed on the outer side of both ends of the dumbbell pin in the middle groove by bolts. It is easy to install and remove. The passive FRID identification tag (2) does not extend beyond the outside of the dumbbell pin and does not affect the normal coal mining process of the coal mining machine.

[0083] The solution provided by this invention overcomes the shortcomings of manual inspection, is simple to implement and easy to maintain. It adds an RFID reader to the existing smooth shoe of the coal mining machine and uses passive radio frequency identification technology to monitor the status of the dumbbell pins and upload the information to the coal mine monitoring center. During the movement of the smooth shoe of the coal mining machine, it can remove floating coal on the side of the coal wall in the middle of the trough, ensuring that the transmission signal is not interfered with by floating coal. This method can realize automatic monitoring of the status of dumbbell pins on the side of the coal wall of the scraper conveyor.

[0084] Even better, because the location information fed back by the identification tags on the dumbbell pin is quite accurate, the data analysis module in the host computer can compare the precise location information fed back by the two identification tags on the same dumbbell pin to accurately determine whether the dumbbell pin has been deformed or has the potential for cracking. The information is then uploaded to the coal mine monitoring center through the underground coal mine communication system, and the coal mine monitoring center dispatches staff to replace the dumbbell pin with a new one in a timely manner to eliminate the safety hazard of the dumbbell pin crack.

[0085] Even better, during the coal mining process, the coal mining machine travels back and forth on the central slot, and the smooth shoe of the coal mining machine passes through all the dumbbell pins in the central slot. Therefore, the FRID reader on the smooth shoe of the coal mining machine can receive feedback position information of all the dumbbell pins in the central slot. Moreover, the smooth shoe of the coal mining machine can clear the floating coal on the side of the coal wall in the central slot during its movement, ensuring that the transmission signal is not interfered with by the floating coal.

[0086] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the invention. Those skilled in the art will understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A status monitoring system for dumbbell pins on the coal wall side of a scraper conveyor, characterized in that, include: A coal mining machine equipped with an RFID reader (1), a scraper conveyor equipped with a passive RFID tag (2), and a host computer installed on the scraper conveyor. The RFID reader (1) and the host computer are connected wirelessly. During the coal mining process, the coal mining machine travels back and forth on the middle trough of the scraper conveyor through a smooth shoe. When passing the dumbbell pin, the RFID reader (1) receives the sensing signal of the passive RFID tag (2) in real time. The RFID reader (1) outputs the RFID radio frequency tag information corresponding to the passive RFID tag (2) and the sensing current intensity signal to the host computer. The host computer determines whether the scraper conveyor has dumbbell pin detachment or dumbbell pin cracks based on the RFID radio frequency tag information and the sensing current intensity signal. After the initial installation of the dumbbell pin status monitoring system for the scraper conveyor, the coal mining machine is started and travels back and forth on the scraper conveyor once at a preset speed V. The host computer stores a set of RFID radio frequency tag information collected by the two RFID readers (1) and the induced current intensity signal Q. n Based on the travel speed V, the FRID radio frequency tag information sequence, and the FRID radio frequency tag information reception time t n Establish the location information of the FRID radio frequency tag information, and establish the FRID radio frequency tag information and the induced current intensity signal Q according to the receiving order of the FRID radio frequency tag information. n The correspondence between the number of the dumbbell pins and the induced current intensity signal Q is determined. n As the theoretical value of the nth induced current intensity; the theoretical value of the induced current intensity Q n The location information of the FRID radio frequency tag and the corresponding relationship data are both used as reference data for comparison, n∈[1,2N]; In actual operation, the host computer, based on the reference data, determines whether there is a missing dumbbell pin according to the received RFID tag information, and determines whether there is a crack in the dumbbell pin according to the received induced current intensity signal. The host computer directly determines the missing passive FRID sensing tag (2) based on the reference data and the real-time FRID radio frequency tag information sequence, and further confirms the dumbbell pin number corresponding to the detached dumbbell pin based on the missing passive FRID sensing tag information. The host computer calculates a reference variable R% based on the real-time induced current intensity signal. When R% is greater than a first preset threshold, it indicates that the position of the positioning blocks at both ends of the dumbbell pin corresponding to the real-time induced current intensity signal has changed, deflection has occurred, or cracks have appeared. R%=|Q n -P n | / Q n Among them, P n To monitor the real-time induced current intensity obtained from the current tag.

2. The coal wall side dumbbell pin status monitoring system for scraper conveyors as described in claim 1, characterized in that: The dumbbell pin is installed in the dumbbell pin seat of two adjacent middle slots in the scraper conveyor. The dumbbell pin has a column and two positioning blocks connected to both ends of the column. The outer surface of the positioning block has a groove for placing the label. The passive RFID identification label (2) is installed in the groove of the positioning block. On the coal mining side, N dumbbell pins are sequentially installed on the scraper conveyor, and correspondingly, 2N passive FRID identification tags (2) are sequentially installed. Each passive FRID identification tag (2) has unique FRID radio frequency tag information, and the same dumbbell pin number corresponds to 2 passive FRID identification tags (2). The coal mining machine's outriggers are connected to the smooth boot via a pin. The FRID reader (1) is installed on the end face of the pin, wherein there is a groove on the end face facing the dumbbell pin, and the FRID reader (1) is installed in the groove. On the coal mining side, the coal mining machine has two smooth shoes, and correspondingly, two pins and two FRID readers (1); The FRID reader has a wireless module for establishing wireless communication connections.

3. The coal wall side dumbbell pin status monitoring system for scraper conveyors as described in claim 2, characterized in that: The minimum horizontal distance between the FRID reader (1) and the passive FRID sensing tag (2) is L1; the FRID system uses a low-frequency operating frequency, and the sensing distance between the FRID reader (1) and each of the passive FRID sensing tags (2) is L1; The horizontal distance between the two passive RFID tags (2) located on the same dumbbell pin is L2; The length of a single central groove is L3; The horizontal distance between the two FRID readers (1) on the coal mining machine is L4.

4. The coal wall side dumbbell pin status monitoring system for scraper conveyors as described in claim 3, characterized in that, The host computer includes a data analysis module, a data storage module, a data upload module, and an alarm notification module. The data storage module is used to store the information transmitted by the passive RFID tag (2); The data analysis module is used to monitor the status of the dumbbell pin based on the data stored in the data storage module; when it is found that there is a crack in the dumbbell pin, a crack warning signal is sent to the alarm warning module. Upon detecting that a dumbbell pin is missing, a loss notification signal is sent to the alarm notification module. The alarm module is used to activate the audible and visual alarm device to provide an alarm prompt after receiving the crack warning signal or the loss warning signal. The data upload module is used to establish a communication connection with the underground communication system of the coal mine, and to transmit the dumbbell pin status monitoring data to the coal mine monitoring center through the underground communication system, so that the coal mine monitoring center dispatchers can install new dumbbell pins in a timely manner and avoid the dumbbell pins falling off, which would cause the central slot connection to become misaligned or disconnected.

5. The coal wall side dumbbell pin status monitoring system for scraper conveyors as described in claim 4, wherein the first preset threshold value is 5%.

6. A method for monitoring the condition of dumbbell pins on the coal wall side of a scraper conveyor, characterized in that, The implementing entity is the coal wall side dumbbell pin status monitoring system for scraper conveyors as described in any one of claims 1-5, and the steps include: Step S1: Record the initial operating data of the system and establish baseline data. Specifically, start the coal mining machine from the starting position and travel back and forth once on the scraper conveyor at a preset travel speed V. The host computer stores the RFID radio frequency tag information collected by the two RFID readers (1) and the induced current intensity signal Q. n Based on the travel speed V, the FRID radio frequency tag information sequence, and the FRID radio frequency tag information reception time t n Establish the location information of the FRID RFID tag information, establish the correspondence between the FRID RFID tag information, the induced current intensity signal, and the dumbbell pin number according to the reception order of the FRID RFID tag information, and set the induced current intensity signal Q... n As the theoretical value of the nth induced current intensity; the theoretical value of the induced current intensity Q n The location information of the RFID tag information and the corresponding relationship data are both used as reference data for comparison. Step S2: In actual operation, the host computer, based on the reference data, determines whether there is a missing dumbbell pin according to the received RFID tag information and whether there is a crack in the dumbbell pin according to the received induced current intensity signal. Step S3: When it is confirmed that there is at least one of the following: dumbbell pin crack or dumbbell pin loss, the host computer will issue a real-time warning and transmit the dumbbell pin status monitoring data to the coal mine monitoring center through the underground coal mine communication system, so that the coal mine monitoring center dispatchers can install new dumbbell pins in a timely manner to avoid the dumbbell pin falling off and causing misalignment or detachment of the central slot connection.

7. The method for monitoring the status of dumbbell pins on the coal wall side of a scraper conveyor as described in claim 6, characterized in that, Step S2 includes: The host computer directly determines the missing passive FRID sensor tag (2) based on the reference data and the real-time FRID radio frequency tag information sequence, and further confirms the dumbbell pin number corresponding to the detached dumbbell pin based on the missing passive FRID sensor tag (2).

8. The method for monitoring the status of dumbbell pins on the coal wall side of a scraper conveyor as described in claim 6 or 7, characterized in that, Step S2 further includes: The host computer calculates a reference variable R% based on the real-time induced current intensity signal. When R% is greater than a first preset threshold, it indicates that the position of the positioning blocks at both ends of the dumbbell pin corresponding to the real-time induced current intensity signal has changed, deflection has occurred, or cracks have appeared. R%=|Q n -P n | / Q n Among them, P n To monitor the real-time induced current intensity obtained from the current tag; Based on the passive FRID sensor tag (2) corresponding to the real-time induced current intensity signal where the reference variable value R% is higher than the preset threshold, and the corresponding dumbbell pin number, the location of the dumbbell pin with the crack is identified.

9. The method for monitoring the status of dumbbell pins on the coal wall side of a scraper conveyor as described in claim 7 or 8, characterized in that, The coal mining machine is equipped with a first FRID reader and a second FRID reader, respectively. Step S2 further includes: Step S21, the host computer receives the induced current intensity signal X collected at the same passive RFID tag location at time t and time t+Δt. n1 X n2 , where X n1 From the first FRID reader, X n2 From the second FRID reader, where Δt = L4 / V; Step S22, the host computer according to X n1 X n2 Calculate the reference variable S%. S%=|X n1 -X n2 | / X n1 When S% is greater than the second preset threshold, it is confirmed that the dumbbell pin at the location of the passive RFID sensor tag has a crack, wherein the second preset threshold is less than the first preset threshold.

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