Mining dumbbell pin device for self-state monitoring

Abstract

The invention discloses a mining dumbbell pin device for self-state monitoring, which comprises a dumbbell pin, the dumbbell pin comprises a dumbbell pin assembly I, and a dumbbell pin assembly II and a dumbbell pin assembly III are fixedly arranged at the two ends of the dumbbell pin assembly I respectively; a first limiting block and a second limiting block are arranged at the ends, away from the first dumbbell pin assembly, of the second dumbbell pin assembly and the third dumbbell pin assembly correspondingly. The ends, close to the first dumbbell pin assembly, of the second dumbbell pin assembly and the third dumbbell pin assembly extend into the first dumbbell pin assembly, and strain sensors are further pasted to the portions, located in the first dumbbell pin assembly, of the second dumbbell pin assembly and the third dumbbell pin assembly. The problems that in the prior art, in the production process, breakage or falling of dumbbell pins is not prone to being found, transverse and longitudinal dislocation of a scraper conveyor occurs, and mechanical accidents are caused are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of mining equipment and relates to a mining dumbbell pin device for monitoring its own state. Background Art

[0002] In the coal mining face, the scraper conveyor is not only used to transport coal and materials, but also serves as the running track of the coal mining machine, so it has become an indispensable key equipment in the modern coal mining process. The structures and components of different types of scraper conveyors are roughly the same, mainly consisting of three parts: the head, the middle part and the tail. The middle part is connected by a dumbbell pin by several scraper conveyors. The two ends of the dumbbell pin are respectively inserted into the two end mounting grooves of the two adjacent scraper conveyors to play a connecting role. Therefore, the dumbbell pin is one of the important components of the scraper conveyor, and its connection method with the two end mounting grooves of the scraper conveyor directly affects the overall working efficiency of the scraper conveyor.

[0003] Due to geological conditions and human factors, the breakage or fall-off of dumbbell pins is not easy to be found during the production process, resulting in strain, breakage and dislocation of the scraper conveyor, causing mechanical accidents. Or during maintenance, the status of the dumbbell pins is not known, and workers are required to clean the coal one by one, which is labor-intensive and has the defect of mechanical injury, and cannot meet the needs of quickly and accurately finding damaged dumbbell pin devices. Summary of the invention

[0004] The purpose of the present invention is to provide a mining dumbbell pin device for self-state monitoring, which solves the problem in the prior art that the breakage or falling off of the dumbbell pin is not easy to be discovered during the production process, resulting in lateral and longitudinal misalignment of the scraper conveyor and causing mechanical accidents.

[0005] The technical solution adopted by the present invention is a mining dumbbell pin device for self-state monitoring, comprising a dumbbell pin, the dumbbell pin comprising a dumbbell pin component 1, dumbbell pin component 2 and dumbbell pin component 3 are respectively fixedly arranged at both ends of the dumbbell pin component 1, and a limit block 1 and a limit block 2 are respectively arranged at the ends of the dumbbell pin component 2 and the dumbbell pin component 3 away from the dumbbell pin component 1, and the ends of the dumbbell pin component 2 and the dumbbell pin component 3 close to the dumbbell pin component 1 extend into the interior of the dumbbell pin component 1, and the parts of the dumbbell pin component 2 and the dumbbell pin component 3 located in the dumbbell pin component 1 are also pasted with strain sensors.

[0006] Preferably, dumbbell pin assembly 1 includes a connecting shaft, a through hole is opened along the center line of the shaft, dumbbell pin bosses are symmetrically arranged at both ends of the connecting shaft, an inner cavity is opened on the dumbbell pin boss, the inner cavity is connected to the through hole, a buffer wear-resistant assembly is installed on the end face of the dumbbell pin boss close to the connecting shaft, and a plurality of threaded holes are evenly arranged on the end face of the dumbbell pin boss away from the connecting shaft, dumbbell pin assembly 2 and dumbbell pin assembly 3 are respectively fixed on the corresponding dumbbell pin bosses through the threaded holes on the corresponding sides, and the ends of dumbbell pin assembly 2 and dumbbell pin assembly 3 close to dumbbell pin assembly 1 extend into the through hole and are detachably connected in the through hole.

[0007] Preferably, the buffering wear-resistant component includes a plurality of slide grooves evenly opened at one end of the dumbbell pin boss near the connecting shaft, a slider is slidably arranged in the slide groove, the slider moves in the slide groove in a direction approaching or away from another dumbbell pin boss, a buffer spring is fixedly connected to one end of the slider near the bottom of the slide groove, the other end of the buffer spring is fixedly connected to the bottom of the slide groove, a wear-resistant block is fixedly installed at one end of the slider away from the bottom of the slide groove, and an end surface of the wear-resistant block facing the other dumbbell pin boss is set to a spherical surface.

[0008] Preferably, dumbbell pin assembly 2 includes a mounting plate 1, on which a plurality of fastening screw holes 1 are arranged, and the fastening screw holes 1 are arranged correspondingly to the threaded holes. The dumbbell pin assembly 2 and the dumbbell pin assembly 1 use fastening screws to fix the mounting plate 1 and the corresponding dumbbell pin boss through the fastening screw holes 1 and the threaded holes. The mounting plate 1 is respectively provided with a first pin portion and a second pin portion on both sides away from and close to the connecting shaft. The first pin portion and the second pin portion are both coaxially arranged with the connecting shaft. The limit block 1 is fixed on the first pin portion, and the second pin portion extends into the through hole from the corresponding side of the connecting shaft and is detachably connected to one end of the dumbbell pin assembly 3 extending into the through hole.

[0009] Preferably, a limiting hole is provided at one end of the first pin portion facing away from the mounting plate, the axis of the limiting hole is perpendicular to the axis of the first pin portion, a positioning block is symmetrically arranged at one end of the first pin portion close to the mounting plate, a positioning groove which cooperates with the positioning block is arranged on the limiting block, the limiting block is installed on the first pin portion and the circumferential movement of the limiting block on the first pin portion is limited by the positioning block and the positioning groove, a limiting pin is installed in the limiting hole, and the limiting pin is used to limit the axial movement of the limiting block on the first pin portion.

[0010] Preferably, a positioning hole is provided at the end of the second pin portion away from the mounting plate one, a circular groove is provided on the inner wall of the positioning hole, a plurality of first wiring grooves are evenly provided on the outer surface of the end of the second pin portion close to the mounting plate one along its length direction, a rotary groove is provided on the outer surface of the second pin portion located between the circular groove and the first wiring groove, the groove serves as a first detection portion, a strain sensor is pasted on the first detection portion, and the second pin portion is detachably connected to one end of the dumbbell pin assembly extending into the through hole through the circular groove.

[0011] Preferably, the dumbbell pin assembly three includes a mounting plate two, on which a plurality of fastening screw holes two are arranged, and the fastening screw holes two are arranged one-to-one with the threaded holes on the corresponding side. The dumbbell pin assembly three and the dumbbell pin assembly one use fastening screws to fix the mounting plate two and the dumbbell pin boss on the corresponding side through the fastening screw holes two and the threaded holes. The mounting plate two is respectively provided with a third pin portion and a fourth pin portion on both sides away from and close to the connecting shaft, and the third pin portion and the fourth pin portion are both coaxially arranged with the connecting shaft. The limit block two is installed on the third pin portion, and the fourth pin portion extends into the through hole and is detachably connected to the second pin portion.

[0012] Preferably, a limiting hole 2 is provided at one end of the third pin portion facing away from the mounting plate 2, the axis of the limiting hole 2 is perpendicular to the axis of the third pin portion, a positioning block 2 is symmetrically arranged at one end of the third pin portion close to the mounting plate 2, a positioning groove which cooperates with the positioning block 2 is arranged on the limiting block 2, the limiting block 2 is installed on the third pin portion, and the circumferential movement of the limiting block 2 on the third pin portion is limited by the positioning block 2 and the positioning groove, a limiting pin 2 is installed in the limiting hole 2, and the limiting pin 2 is used to limit the axial movement of the limiting block 2 on the third pin portion.

[0013] Preferably, a positioning shaft is provided at one end of the fourth pin portion away from the second mounting plate, the positioning shaft is provided corresponding to the positioning hole, a clamping block cooperating with the circular slot is provided on the positioning shaft, the positioning shaft extends into the positioning hole and is clamped in the circular slot through the clamping block, a plurality of second wiring grooves are evenly provided on the outer surface of one end of the fourth pin portion close to the second mounting plate along its length direction, a rotary groove is provided on the outer surface of the fourth pin portion located between the positioning shaft and the second wiring groove, the groove serves as a second detection portion, and a strain sensor is pasted on the second detection portion.

[0014] Preferably, a detection module, a wireless transmission module and a power supply are installed in the inner cavity, the detection module and the wireless transmission module are connected to the power supply through a wire, the detection module and the wireless transmission module are electrically connected through a wire, the wireless transmission module is also connected to the user terminal through wireless transmission, the strain sensor is connected to the detection module through a wire, and the connecting wire between the strain sensor and the detection module is arranged in the corresponding second wiring groove or the first wiring groove.

[0015] The beneficial effects of the present invention are: When the dumbbell pin of the present invention breaks or falls off, the first detection part and the second detection part arranged inside the dumbbell pin are deformed, thereby driving the strain sensor attached thereto to detect strain, and at the same time guiding the data to the detection module and the wireless transmission module installed in the inner cavity. When in use, the wireless transmission module of each dumbbell pin device can be connected to the centralized control platform of the construction site for communication, and the deformation state of the dumbbell pin device can be detected in real time through the wireless transmission module. When the dumbbell pin device breaks or falls off, the position of the dumbbell pin device breaking or falling off problem on the scraper conveyor can be quickly determined, and corresponding measures can be taken in time to avoid the occurrence of mechanical accidents, and the process of manually checking the state of the dumbbell pin device one by one during maintenance is avoided, thereby reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a mining dumbbell pin device for self-state monitoring of the present invention; Figure 2 It is a structural schematic diagram of a dumbbell pin assembly 1 in a mining dumbbell pin device for self-state monitoring of the present invention; Figure 3 It is a schematic diagram of the internal structure of the buffer wear-resistant component in the mining dumbbell pin device for self-state monitoring of the present invention; Figure 4 It is a structural schematic diagram of the dumbbell pin assembly 2 in the mining dumbbell pin device for self-state monitoring of the present invention; Figure 5 It is a structural schematic diagram of the second pin portion in the mining dumbbell pin device for self-state monitoring of the present invention; Figure 6 It is a structural schematic diagram of the dumbbell pin assembly 3 in the mining dumbbell pin device for self-state monitoring of the present invention; Figure 7 It is a structural schematic diagram of the fourth pin portion in the mining dumbbell pin device for self-state monitoring of the present invention; Figure 8 It is a structural schematic diagram of a scraper conveyor in a mining dumbbell pin device for self-state monitoring of the present invention.

[0017] In the figure: 1. chute, 2. dumbbell pin, 21. dumbbell pin assembly 1, 211. connecting shaft, 212. dumbbell pin boss, 213. through hole, 214. inner cavity, 215. buffer wear-resistant assembly, 2151. chute, 2152. slider, 2153. wear-resistant block, 2154. buffer spring, 2155. wear-resistant plate, 216. threaded hole, 22. dumbbell pin assembly 2, 221. mounting plate 1, 222. first pin part, 223. positioning block 1, 224. limiting hole 1, 225. second pin part, 2251. positioning Hole, 2252. Reciprocating card slot, 2253. First detection part, 2254. First wiring groove, 226. Fastening screw hole one, 23. Dumbbell pin assembly three, 231. Mounting plate two, 232. Third pin part, 233. Positioning block two, 234. Limiting hole two, 235. Fourth pin part, 2351. Positioning shaft, 2352. Card block, 2353. Second detection part, 2354. Second wiring groove, 236. Fastening screw hole two, 24. Limiting block one, 25. Limiting block two, 26. Limiting pin one, 27. Limiting pin two. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Example 1 The dumbbell pin device for mining used for self-state monitoring of the present invention has a structure as follows: Figure 1 As shown, it includes a dumbbell pin 2, which includes a dumbbell pin component 1 21, at both ends of the dumbbell pin component 1 21, dumbbell pin component 2 22 and dumbbell pin component 3 23 are fixedly arranged, and the ends of the dumbbell pin component 22 and the dumbbell pin component 3 23 away from the dumbbell pin component 1 21 are also provided with a limit block 1 24 and a limit block 25, respectively. The ends of the dumbbell pin component 22 and the dumbbell pin component 3 23 close to the dumbbell pin component 1 21 extend into the dumbbell pin component 1 21, and the parts of the dumbbell pin component 22 and the dumbbell pin component 3 23 located in the dumbbell pin component 1 21 are also pasted with strain sensors.

[0020] like Figure 2As shown, dumbbell pin assembly 1 21 includes a connecting shaft 211, a through hole 213 is opened along the center line of the shaft, dumbbell pin bosses 212 are symmetrically arranged at both ends of the connecting shaft 211, an inner cavity 214 is opened on the dumbbell pin boss 212, the inner cavity 214 is communicated with the through hole 213, a buffer wear-resistant assembly 215 is installed on the end face of the dumbbell pin boss 212 close to the connecting shaft 211, and a plurality of threaded holes 216 are evenly arranged on the end face of the dumbbell pin boss 212 away from the connecting shaft 211, the dumbbell pin assembly 22 and the dumbbell pin assembly 3 23 are respectively fixed on the corresponding dumbbell pin boss 212 through the threaded holes 216 on the corresponding side, and the ends of the dumbbell pin assembly 22 and the dumbbell pin assembly 3 23 close to the dumbbell pin assembly 1 21 extend into the through hole 213 and are detachably connected in the through hole 213.

[0021] like Figure 3 As shown, the buffer wear-resistant component 215 includes a plurality of slide grooves 2151 evenly opened at one end of the dumbbell pin boss 212 near the connecting shaft 211, a slider 2152 is slidably arranged in the slide groove 2151, the slider 2152 moves in the slide groove 2151 in a direction approaching or away from another dumbbell pin boss 212, one end of the slider 2152 near the bottom of the slide groove 2151 is fixedly connected with a buffer spring 2154, the other end of the buffer spring 2154 is fixedly connected to the bottom of the slide groove 2151, and the end of the slider 2152 away from the bottom of the slide groove 2151 is fixedly installed with a wear-resistant block 2153, and the end surface of the wear-resistant block 2153 facing the other dumbbell pin boss 212 is set as a spherical surface.

[0022] A detection module, a wireless transmission module and a power supply are installed in the inner cavity 214. The detection module and the wireless transmission module are connected to the power supply through a wire, and the detection module and the wireless transmission module are electrically connected through a wire. The wireless transmission module is also connected to the user terminal through wireless transmission, and the strain sensor is connected to the detection module through a wire.

[0023] like Figure 8 As shown, the dumbbell pins 2 are installed in pairs between two groups of chutes 1 of the scraper conveyor. When the scraper conveyor is pushed and the buffer wear-resistant component 215 is under pressure, the buffer spring 2154 is compressed to a certain extent, the slider 2152 slides in the chute 2151, and the wear-resistant block 2153 is subjected to friction; when the buffer wear-resistant component is not under force, the buffer spring 2154 rebounds to the initial position, which plays a role of wear-resistant buffer to a certain extent, thereby extending the service life of the dumbbell pin device.

[0024] A detection module and a wireless transmission module are arranged in the inner cavity 214. When the dumbbell pin 2 body is broken or falls off, the internal arrangement of the dumbbell pin 2 is deformed, and the strain sensor monitors the deformation in real time, thereby avoiding the process of manually checking the status of the dumbbell pin device one by one during maintenance, reducing labor intensity, improving maintenance efficiency, and ensuring the continuous operation of the equipment.

[0025] Example 2 On the basis of Example 1, a wear-resistant plate 2155 is fixed on one end surface of the dumbbell pin boss 212 close to the connecting shaft 211 .

[0026] On the basis of Example 1, when the buffer wear-resistant component 215 is under pressure, the buffer spring 2154 is compressed to a certain extent, the slider 2152 slides in the slide groove 2151, and the wear-resistant block 2153 is rubbed. When the wear-resistant block 2153 is completely pressed into the slide groove 2151, the wear-resistant plate 2155 is rubbed.

[0027] Example 3 On the basis of Example 1 or Example 2, Figure 4 As shown, the dumbbell pin assembly 22 includes a mounting plate 221, and a plurality of fastening screw holes 226 are arranged on the mounting plate 221. The fastening screw holes 226 and the threaded holes 216 are arranged one by one. The dumbbell pin assembly 22 and the dumbbell pin assembly 21 are fixed to the mounting plate 221 and the corresponding dumbbell pin boss 212 by fastening screws through the fastening screw holes 226 and the threaded holes 216. The mounting plate 221 is respectively provided with a first pin portion 222 and a second pin portion 225 on both sides away from and close to the connecting shaft 211. The first pin portion 222 and the second pin portion 225 are both coaxially arranged with the connecting shaft 211. The limit block 24 is fixed to the first pin portion 222, and the second pin portion 225 extends into the through hole 213 from the corresponding side of the connecting shaft 211 and is detachably connected to one end of the dumbbell pin assembly 3 23 extending into the through hole 213.

[0028] A limiting hole 224 is provided at one end of the first pin portion 222 away from the mounting plate 221, and the axis of the limiting hole 224 is perpendicular to the axis of the first pin portion 222. A positioning block 223 is symmetrically arranged at one end of the first pin portion 222 close to the mounting plate 221, and a positioning groove that cooperates with the positioning block 223 is arranged on the limiting block 24. The limiting block 24 is installed on the first pin portion 222 and the circumferential movement of the limiting block 24 on the first pin portion 222 is limited by the positioning block 223 and the positioning groove. A limiting pin 26 is installed in the limiting hole 224, and the limiting pin 26 is used to limit the axial movement of the limiting block 24 on the first pin portion 222.

[0029] like Figure 5As shown, a positioning hole 2251 is provided at one end of the second pin portion 225 away from the mounting plate 221, a circular groove 2252 is provided on the inner wall of the positioning hole 2251, a plurality of first wiring grooves 2254 are evenly provided on the outer surface of one end of the second pin portion 225 close to the mounting plate 221 along its length direction, a rotary groove is provided on the outer surface of the second pin portion 225 located between the circular groove 2252 and the first wiring groove 2254, the groove serves as a first detection portion 2253, a strain sensor is pasted on the first detection portion 2253, and the second pin portion 225 is detachably connected to one end of the dumbbell pin assembly 3 23 extending into the through hole 213 through the circular groove 2252.

[0030] like Figure 6 As shown, the dumbbell pin assembly three 23 includes a mounting plate two 231, and a plurality of fastening screw holes two 236 are arranged on the mounting plate two 231. The fastening screw holes two 236 are arranged one by one with the threaded holes 216 on the corresponding side. The dumbbell pin assembly three 23 and the dumbbell pin assembly one 21 use fastening screws to fix the mounting plate two 231 and the dumbbell pin boss 212 on the corresponding side through the fastening screw holes two 236 and the threaded holes 216. The mounting plate two 231 is respectively provided with a third pin portion 232 and a fourth pin portion 235 on both sides away from and close to the connecting shaft 211. The third pin portion 232 and the fourth pin portion 235 are both coaxially arranged with the connecting shaft 211. The limit block two 25 is installed on the third pin portion 232, and the fourth pin portion 235 extends into the through hole 213 and is detachably connected to the second pin portion 225.

[0031] A second limiting hole 234 is provided at one end of the third pin portion 232 away from the second mounting plate 231, and the axis of the second limiting hole 234 is perpendicular to the axis of the third pin portion 232. A second positioning block 233 is symmetrically arranged at one end of the third pin portion 232 close to the second mounting plate 231, and a positioning groove that cooperates with the second positioning block 233 is arranged on the second limiting block 25. The second limiting block 25 is installed on the third pin portion 232, and the circumferential movement of the second limiting block 25 on the third pin portion 232 is limited by the second positioning block 233 and the positioning groove. A second limiting pin 27 is installed in the second limiting hole 234, and the second limiting pin 27 is used to limit the axial movement of the second limiting block 25 on the third pin portion 232.

[0032] like Figure 7As shown, a positioning shaft 2351 is provided at one end of the fourth pin portion 235 away from the second mounting plate 231, the positioning shaft 2351 is provided corresponding to the positioning hole 2251, a clamping block 2352 cooperating with the circular slot 2252 is provided on the positioning shaft 2351, the positioning shaft 2351 extends into the positioning hole 2251 and is clamped in the circular slot 2252 through the clamping block 2352, a plurality of second wiring grooves 2354 are evenly provided on the outer surface of one end of the fourth pin portion 235 close to the second mounting plate 231 along its length direction, a rotary groove is provided on the outer surface of the fourth pin portion 235 located between the positioning shaft 2351 and the second wiring groove 2354, the groove serves as the second detection portion 2353, and a strain sensor is pasted on the second detection portion 2353.

[0033] In this embodiment, the assembly process of the dumbbell pin assembly 22 and the dumbbell pin assembly 3 23 is as follows: Stick the strain sensor to the first detection part 2253 and the second detection part 2353, and arrange the wires in the corresponding first wiring groove 2254 and the second wiring groove 2354, then pass the second pin part 225 through the inner cavity 214 and the through hole 213 on the corresponding side in turn, and pass the fourth pin part 235 through the inner cavity 214 and the through hole 213 on the corresponding side in turn, and rotate, push and rotate in the opposite direction with the dumbbell pin assembly 22 and the dumbbell pin assembly 3 23 so that the return groove 2252 and the block 2352 can achieve a clamping and locking effect, and then fix the mounting plate 231 and the mounting plate 1 221 with the corresponding dumbbell pin boss 212 by fastening screws, and then install the limit block 25 and the limit block 1 24 on the third pin part and the first pin part respectively, and then install the limit pin 1 26 and the limit pin 27 to realize the axial limit of the limit block 25 and the limit block 1 24.

[0034] When the dumbbell pin breaks or falls off, the first detection part and the second detection part arranged inside the dumbbell pin are deformed, thereby driving the strain sensor attached thereto to detect strain. At the same time, the data is directed to the detection module and the wireless transmission module installed in the inner cavity, and the wireless transmission module transmits it to the user terminal, thereby avoiding the process of manually checking the status of the dumbbell pin device one by one during maintenance, and reducing labor intensity.

[0035] During the working process, the scraper conveyor is repeatedly pushed and pulled by the hydraulic support, and the chute 1 is repeatedly bent, which will cause irregular movement of the dumbbell pin, so that the dumbbell pin bosses symmetrically arranged on both sides of the connecting shaft are subjected to force, and then the dumbbell pin assembly 2 and the dumbbell pin assembly 3 are subjected to force in opposite directions. At the same time, the return groove and the block make the dumbbell pin assembly 2 and the dumbbell pin assembly 3 achieve a clamping and locking effect in the middle position. Finally, the force is detected by the strain sensor in the first detection part and the second detection part.

[0036] Example 4 The connecting wires of the strain sensor and the detection module are arranged in the corresponding second wiring groove 2354 or the first wiring groove 2254 .

[0037] Example 5 On the basis of Embodiment 4, the fourth pin portion 235 and the second pin portion 225 are adapted to the size of the through hole 213 .

[0038] Example 6 Based on Example 5, the user terminal is a centralized control platform, a mobile phone, or a computer at the construction site.

[0039] Example 7 On the basis of Example 5, the return-shaped card slot and the card block are rotated and pushed against each other by dumbbell pin assembly 2 and dumbbell pin assembly 3, and then rotated in the opposite direction to achieve a clamping and locking effect.

Claims

1. A mining dumbbell pin device for self-state monitoring, characterized in that: The dumbbell pin (2) comprises a dumbbell pin component 1 (21), a dumbbell pin component 2 (22) and a dumbbell pin component 3 (23) are fixedly arranged at both ends of the dumbbell pin component 1 (21), a limit block 1 (24) and a limit block 2 (25) are arranged at the ends of the dumbbell pin component 2 (22) and the dumbbell pin component 3 (23) facing away from the dumbbell pin component 1 (21), and the ends of the dumbbell pin component 2 (22) and the dumbbell pin component 3 (23) close to the dumbbell pin component 1 (21) extend into the dumbbell pin component 1 (21), and the parts of the dumbbell pin component 2 (22) and the dumbbell pin component 3 (23) located in the dumbbell pin component 1 (21) are also attached with strain sensors.

2. The mining dumbbell pin device for self-state monitoring according to claim 1, characterized in that: The dumbbell pin assembly (21) comprises a connecting shaft (211), the connecting shaft (211) is provided with a through hole (213) along the shaft centerline, dumbbell pin bosses (212) are symmetrically arranged at both ends of the connecting shaft (211), an inner cavity (214) is arranged on the dumbbell pin boss (212), the inner cavity (214) is communicated with the through hole (213), a buffer wear-resistant assembly (215) is installed on one end surface of the dumbbell pin boss (212) close to the connecting shaft (211), and the A plurality of threaded holes (216) are evenly arranged on an end surface of the dumbbell pin boss (212) away from the connecting shaft (211); the dumbbell pin assembly 2 (22) and the dumbbell pin assembly 3 (23) are respectively fixed to the corresponding dumbbell pin boss (212) through the threaded holes (216) on the corresponding sides; the dumbbell pin assembly 2 (22) and the dumbbell pin assembly 3 (23) have their ends close to the dumbbell pin assembly 1 (21) extending into the through hole (213) and are detachably connected in the through hole (213).

3. The mining dumbbell pin device for self-state monitoring according to claim 2, characterized in that: The buffer wear-resistant component (215) comprises a plurality of slide grooves (2151) uniformly formed at one end of the dumbbell pin boss (212) close to the connecting shaft (211), a slider (2152) being slidably arranged in the slide groove (2151), the slider (2152) moving in the slide groove (2151) in a direction close to or away from another dumbbell pin boss (212), a buffer spring (2154) being fixedly connected to one end of the slider (2152) close to the bottom of the slide groove (2151), the other end of the buffer spring (2154) being fixedly connected to the bottom of the slide groove (2151), a wear-resistant block (2153) being fixedly installed at one end of the slider (2152) away from the bottom of the slide groove (2151), and one end surface of the wear-resistant block (2153) facing the other dumbbell pin boss (212) being arranged as a spherical surface.

4. The mining dumbbell pin device for self-state monitoring according to claim 2, characterized in that: The dumbbell pin assembly 2 (22) comprises a mounting plate 1 (221), on which a plurality of fastening screw holes 1 (226) are arranged, wherein the fastening screw holes 1 (226) are arranged in a one-to-one correspondence with the threaded holes (216), and the dumbbell pin assembly 2 (22) and the dumbbell pin assembly 1 (21) are fixed to the mounting plate 1 (221) and the corresponding dumbbell pin boss (212) by fastening screws through the fastening screw holes 1 (226) and the threaded holes (216). The mounting plate 1 (221) ) are respectively provided with a first pin portion (222) and a second pin portion (225) on both sides away from and close to the connecting shaft (211); the first pin portion (222) and the second pin portion (225) are both coaxially arranged with the connecting shaft (211); the limit block 1 (24) is fixed to the first pin portion (222); the second pin portion (225) extends into the through hole (213) from a corresponding side of the connecting shaft (211) and is detachably connected to an end of the dumbbell pin assembly 3 (23) extending into the through hole (213).

5. The mining dumbbell pin device for self-state monitoring according to claim 4, characterized in that: A limiting hole (224) is provided at one end of the first pin portion (222) away from the mounting plate (221); the axis of the limiting hole (224) is perpendicular to the axis of the first pin portion (222); a positioning block (223) is symmetrically arranged at one end of the first pin portion (222) close to the mounting plate (221); a positioning groove that cooperates with the positioning block (223) is arranged on the limiting block (24); the limiting block (24) is installed on the first pin portion (222); the circumferential movement of the limiting block (24) on the first pin portion (222) is limited by the positioning block (223) and the positioning groove; a limiting pin (26) is installed in the limiting hole (224); the limiting pin (26) is used to limit the axial movement of the limiting block (24) on the first pin portion (222).

6. The mining dumbbell pin device for self-state monitoring according to claim 5, characterized in that: A positioning hole (2251) is provided at one end of the second pin portion (225) away from the first mounting plate (221); a circular groove (2252) is provided on the inner wall of the positioning hole (2251); a plurality of first wiring grooves (2254) are evenly provided on the outer surface of one end of the second pin portion (225) close to the first mounting plate (221) along its length direction; a circular groove is provided on the outer surface of the second pin portion (225) located between the circular groove (2252) and the first wiring grooves (2254); the groove serves as a first detection portion (2253); a strain sensor is attached to the first detection portion (2253); and the second pin portion (225) is detachably connected to one end of the dumbbell pin assembly (23) extending into the through hole (213) through the circular groove (2252).

7. The mining dumbbell pin device for self-state monitoring according to claim 6, characterized in that: The dumbbell pin assembly 3 (23) comprises a mounting plate 2 (231), on which a plurality of fastening screw holes 2 (236) are arranged, and the fastening screw holes 2 (236) are arranged in a one-to-one correspondence with the threaded holes (216) on the corresponding side. The dumbbell pin assembly 3 (23) and the dumbbell pin assembly 1 (21) are fastened to the mounting plate 2 (231) and the dumbbell pin convex portion on the corresponding side by fastening screws through the fastening screw holes 2 (236) and the threaded holes (216). The second mounting plate (231) is fixed to the platform (212); a third pin portion (232) and a fourth pin portion (235) are respectively arranged on both sides of the mounting plate (231) away from and close to the connecting shaft (211); the third pin portion (232) and the fourth pin portion (235) are both arranged coaxially with the connecting shaft (211); the second limit block (25) is mounted on the third pin portion (232); the fourth pin portion (235) extends into the through hole (213) and is detachably connected to the second pin portion (225).

8. The mining dumbbell pin device for self-state monitoring according to claim 7, characterized in that: A second limiting hole (234) is provided at one end of the third pin portion (232) away from the second mounting plate (231), and the axis of the second limiting hole (234) is perpendicular to the axis of the third pin portion (232). A second positioning block (233) is symmetrically arranged at one end of the third pin portion (232) close to the second mounting plate (231), and a positioning groove that cooperates with the second positioning block (233) is arranged on the second limiting block (25). The second limiting block (25) is installed on the third pin portion (232) to limit the circumferential movement of the second limiting block (25) on the third pin portion (232) through the second positioning block (233) and the positioning groove. A second limiting pin (27) is installed in the second limiting hole (234), and the second limiting pin (27) is used to limit the axial movement of the second limiting block (25) on the third pin portion (232).

9. The mining dumbbell pin device for self-state monitoring according to claim 8, characterized in that: A positioning shaft (2351) is arranged at one end of the fourth pin portion (235) away from the second mounting plate (231), and the positioning shaft (2351) is arranged corresponding to the positioning hole (2251). A clamping block (2352) cooperating with the circular clamping groove (2252) is arranged on the positioning shaft (2351), and the positioning shaft (2351) extends into the positioning hole (2251) and is clamped in the circular clamping groove (2252) through the clamping block (2352). A plurality of second wiring grooves (2354) are evenly arranged on the outer surface of one end of the fourth pin portion (235) close to the second mounting plate (231) along its length direction, and a rotational groove is arranged on the outer surface of the fourth pin portion (235) located between the positioning shaft (2351) and the second wiring groove (2354), and the groove serves as a second detection portion (2353), and a strain sensor is attached to the second detection portion (2353).

10. The mining dumbbell pin device for self-state monitoring according to claim 9, characterized in that: A detection module, a wireless transmission module and a power supply are installed in the inner cavity (214); the detection module and the wireless transmission module are connected to the power supply via a wire; the detection module and the wireless transmission module are electrically connected via a wire; the wireless transmission module is also connected to a user terminal via wireless transmission; the strain sensor is connected to the detection module via a wire; and the connecting wire between the strain sensor and the detection module is arranged in a corresponding second wiring groove (2354) or first wiring groove (2254).

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