Dumbbell pin device for self-condition monitoring in mining

Abstract

This invention discloses a dumbbell pin device for self-monitoring in mining applications. The device includes a dumbbell pin assembly 1, with dumbbell pin assembly 2 and dumbbell pin assembly 3 fixedly mounted at both ends. Limiting blocks 1 and 2 are respectively provided at the ends of dumbbell pin assembly 2 and dumbbell pin assembly 3 opposite to dumbbell pin assembly 1. Strain sensors are attached to the portions of dumbbell pin assembly 2 and dumbbell pin assembly 3 within dumbbell pin assembly 1, with the latter portion also being fitted with a strain sensor. This invention solves the problem in existing technologies where the breakage or detachment of dumbbell pins during production is difficult to detect, leading to lateral and longitudinal misalignment of the scraper conveyor and causing mechanical accidents.

Description

Technical Field

[0001] This invention belongs to the field of mining equipment technology and relates to a mining dumbbell pin device for self-monitoring. Background Technology

[0002] In coal mining faces, scraper conveyors not only transport coal and materials but also serve as the running track for the coal mining machine, making them an indispensable key piece of equipment in modern coal mining technology. Different types of scraper conveyors share a similar structure and components, primarily consisting of three parts: the head section, the middle section, and the tail section. The middle section comprises several scraper conveyors connected by dumbbell pins. The two ends of the dumbbell pins are inserted into the end mounting slots of adjacent scraper conveyors, serving a connecting function. Therefore, the dumbbell pin is one of the most important components of the scraper conveyor, and its connection method with the end mounting slots directly affects the overall working efficiency of the scraper conveyor.

[0003] Due to geological conditions and human factors, the breakage or detachment of dumbbell pins during production is not easily detected, leading to strain, breakage, and dislocation of the scraper conveyor, causing mechanical accidents. Alternatively, during maintenance, the condition of the dumbbell pins may be unknown, requiring workers to inspect each one individually after cleaning the coal. This is labor-intensive and poses a risk of mechanical injury, failing to meet the need for a device that can quickly and accurately detect damaged dumbbell pins. Summary of the Invention

[0004] The purpose of this invention is to provide a mining dumbbell pin device for self-monitoring, which solves the problem in the prior art that the breakage or detachment of dumbbell pins during the production process is not easily detected, leading to lateral and longitudinal misalignment of the scraper conveyor and causing mechanical accidents.

[0005] The technical solution adopted in this invention is a mining dumbbell pin device for self-condition monitoring, comprising a dumbbell pin, a dumbbell pin assembly 1, dumbbell pin assembly 2 and dumbbell pin assembly 3 fixedly disposed at both ends of dumbbell pin assembly 1, and limiting block 1 and limiting block 2 respectively disposed at the ends of dumbbell pin assembly 2 and dumbbell pin assembly 3 away from dumbbell pin assembly 1, and strain sensors attached to the portions of dumbbell pin assembly 2 and dumbbell pin assembly 3 located inside dumbbell pin assembly 1.

[0006] Preferably, dumbbell pin assembly one includes a connecting shaft with a through hole along its center line. Dumbbell pin bosses are symmetrically arranged at both ends of the connecting shaft, and each dumbbell pin boss has an inner cavity that communicates with the through hole. A buffer wear-resistant component is installed on the end face of the dumbbell pin boss near the connecting shaft, and several threaded holes are evenly arranged on the end face of the dumbbell pin boss away from the connecting shaft. Dumbbell pin assembly two and dumbbell pin assembly three are respectively fixed to their respective dumbbell pin bosses through the threaded holes on their respective sides. The ends of dumbbell pin assembly two and dumbbell pin assembly three near dumbbell pin assembly one extend into the through hole and are detachably connected within the through hole.

[0007] Preferably, the buffer wear-resistant component includes a plurality of grooves evenly opened at one end of the dumbbell pin boss near the connecting shaft. A slider is slidably disposed in the groove. The slider moves in the groove towards or away from another dumbbell pin boss. A buffer spring is fixedly connected to one end of the slider near the bottom of the groove. The other end of the buffer spring is fixedly connected to the bottom of the groove. A wear-resistant block is fixedly installed at the end of the slider away from the bottom of the groove. The end face of the wear-resistant block facing the other dumbbell pin boss is set as a spherical surface.

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

[0009] Preferably, a limiting hole is provided at the end of the first pin away from the mounting plate, the axis of the limiting hole is perpendicular to the axis of the first pin, and a positioning block is symmetrically arranged at the end of the first pin near the mounting plate. The limiting block is provided with a positioning groove that cooperates with the positioning block. The limiting block is installed on the first pin and the circumferential movement of the limiting block on the first pin is restricted by the positioning block and the positioning groove. A limiting pin is installed in the limiting hole and is used to restrict the axial movement of the limiting block on the first pin.

[0010] Preferably, the end of the second pin away from the mounting plate is provided with a positioning hole, and the inner wall of the positioning hole is provided with a U-shaped groove. The outer surface of the end of the second pin near the mounting plate is provided with a plurality of first wiring grooves evenly arranged along its length. The outer surface of the second pin located between the U-shaped groove and the first wiring groove is provided with a U-shaped groove, which serves as a first detection part. A strain sensor is attached to the first detection part. The second pin is detachably connected to the end of the dumbbell pin assembly three that extends into the through hole through the U-shaped groove.

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

[0012] Preferably, a limiting hole 2 is provided at the end of the third pin away from the mounting plate 2. The axis of the limiting hole 2 is perpendicular to the axis of the third pin. Positioning blocks 2 are symmetrically arranged at the end of the third pin near the mounting plate 2. Positioning grooves that cooperate with positioning blocks 2 are provided on the limiting blocks 2. The limiting blocks 2 are installed on the third pin and the circumferential movement of the limiting blocks 2 on the third pin is restricted by the positioning blocks 2 and the positioning grooves. A limiting pin 2 is installed in the limiting hole 2 and is used to restrict the axial movement of the limiting blocks 2 on the third pin.

[0013] Preferably, a positioning shaft is provided at the end of the fourth pin away from the second mounting plate. The positioning shaft is correspondingly provided with a positioning hole. A locking block is provided on the positioning shaft to cooperate with the U-shaped slot. The positioning shaft extends into the positioning hole and is locked in the U-shaped slot by the locking block. Multiple second wiring grooves are evenly provided along the length direction on the outer surface of the fourth pin near the second mounting plate. A U-shaped groove is provided on the outer surface of the fourth pin between the positioning shaft and the second wiring groove. The groove serves as a second detection part, and a strain sensor is attached to the second detection part.

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

[0015] The beneficial effects of this invention are:

[0016] When the dumbbell pin of this invention breaks or falls off, the first and second detection parts inside the dumbbell pin deform, thereby triggering the strain sensor attached to it to detect the strain. Simultaneously, the data is guided to a detection module and a wireless transmission module installed inside the cavity. In use, the wireless transmission modules of each dumbbell pin device can be connected to a centralized control platform at the construction site. The wireless transmission modules can monitor the deformation state of the dumbbell pin devices in real time. When a dumbbell pin breaks or falls off, the location of the broken or fallen dumbbell pin on the scraper conveyor can be quickly determined, and corresponding measures can be taken in a timely manner to avoid mechanical accidents. Furthermore, this invention avoids the process of manually inspecting the condition of each dumbbell pin device during maintenance, reducing labor intensity. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the mining dumbbell pin device for self-state monitoring according to the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the dumbbell pin assembly 1 in the mining dumbbell pin device for self-monitoring of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the buffer wear-resistant component in the mining dumbbell pin device for self-condition monitoring of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of dumbbell pin assembly two in the mining dumbbell pin device for self-monitoring of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the second pin in the mining dumbbell pin device for self-monitoring of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of dumbbell pin assembly three in the mining dumbbell pin device for self-monitoring of the present invention;

[0023] Figure 7 This is a schematic diagram of the fourth pin in the mining dumbbell pin device for self-monitoring of the present invention;

[0024] Figure 8 This is a schematic diagram of the scraper conveyor in the mining dumbbell pin device for self-condition monitoring of the present invention.

[0025] In the diagram: 1. Chute, 2. Dumbbell pin, 21. Dumbbell pin assembly one, 211. Connecting shaft, 212. Dumbbell pin boss, 213. Through hole, 214. Inner cavity, 215. Buffer wear-resistant assembly, 2151. Slide, 2152. Slider, 2153. Wear-resistant block, 2154. Buffer spring, 2155. Wear-resistant plate, 216. Threaded hole, 22. Dumbbell pin assembly two, 221. Mounting plate one, 222. First pin, 223. Positioning block one, 224. Limiting hole one, 225. Second pin, 2251. Positioning 2252. Hole, 2253. U-shaped slot, 2254. First detection part, 2255. 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. Locking 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 Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] The present invention relates to a dumbbell pin device for self-monitoring in mining applications, the structure of which is as follows: Figure 1 As shown, the device includes a dumbbell pin 2, which includes a dumbbell pin assembly 21. Dumbbell pin assembly 21 has dumbbell pin assembly 22 and dumbbell pin assembly 23 fixedly installed at both ends. Limiting blocks 24 and 25 are respectively installed at the ends of dumbbell pin assembly 22 and dumbbell pin assembly 23 away from dumbbell pin assembly 21. Strain sensors are attached to the portions of dumbbell pin assembly 22 and dumbbell pin assembly 23 that are close to dumbbell pin assembly 21 and extend into the dumbbell pin assembly 21.

[0029] like Figure 2As shown, dumbbell pin assembly 1 21 includes a connecting shaft 211. The connecting shaft 211 has a through hole 213 along its center line. Dumbbell pin bosses 212 are symmetrically arranged at both ends of the connecting shaft 211. The dumbbell pin bosses 212 have an inner cavity 214 that communicates with the through hole 213. A buffer wear-resistant component 215 is installed on the end face of the dumbbell pin bosses 212 near the connecting shaft 211. A plurality of threaded holes 216 are evenly arranged on the end face of the dumbbell pin bosses 212 away from the connecting shaft 211. Dumbbell pin assembly 22 and dumbbell pin assembly 3 23 are respectively fixed to the corresponding dumbbell pin bosses 212 through the threaded holes 216 on their respective sides. The ends of dumbbell pin assembly 22 and dumbbell pin assembly 3 23 near dumbbell pin assembly 1 21 extend into the through hole 213 and are detachably connected within the through hole 213.

[0030] like Figure 3 As shown, the buffer wear-resistant component 215 includes several grooves 2151 evenly opened at one end of the dumbbell pin boss 212 near the connecting shaft 211. A slider 2152 is slidably disposed in the groove 2151. The slider 2152 moves in the groove 2151 in a direction close to or away from another dumbbell pin boss 212. A buffer spring 2154 is fixedly connected to one end of the slider 2152 near the bottom of the groove 2151. The other end of the buffer spring 2154 is fixedly connected to the bottom of the groove 2151. A wear-resistant block 2153 is fixedly installed at one end of the slider 2152 away from the bottom of the groove 2151. The end face of the wear-resistant block 2153 facing the other dumbbell pin boss 212 is set as a spherical surface.

[0031] The inner cavity 214 houses a detection module, a wireless transmission module, and a power supply. The detection module and the wireless transmission module are connected to the power supply via wires, and are also electrically connected via wires. The wireless transmission module is also connected to the user terminal via wireless transmission. The strain sensor is connected to the detection module via wires.

[0032] like Figure 8 As shown, dumbbell pins 2 are installed in pairs between two sets of chutes 1 of the scraper conveyor. When the scraper conveyor is pushed and the wear-resistant buffer 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 wear-resistant buffer component is not under force, the buffer spring 2154 returns to its initial position, which plays a certain role in wear-resistant buffering and extends the service life of the dumbbell pin device.

[0033] The inner cavity 214 is equipped with a detection module and a wireless transmission module. When the dumbbell pin 2 body breaks or falls off, the internal structure of the dumbbell pin 2 deforms. The strain sensor monitors the deformation in real time, 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.

[0034] Example 2

[0035] Based on Embodiment 1, a wear-resistant plate 2155 is fixed on one end face of the dumbbell pin boss 212 near the connecting shaft 211.

[0036] Based on Example 1, when the buffer wear-resistant component 215 is pressed, the buffer spring 2154 is compressed to a certain extent, the slider 2152 slides in the groove 2151, the wear-resistant block 2153 is rubbed, and when the wear-resistant block 2153 is completely pressed into the groove 2151, the wear-resistant plate 2155 is rubbed.

[0037] Example 3

[0038] Based on Example 1 or Example 2, such as Figure 4 As shown, dumbbell pin assembly 22 includes mounting plate 221. Mounting plate 221 has several fastening screw holes 226, which correspond one-to-one with threaded holes 216. Dumbbell pin assembly 22 and dumbbell pin assembly 21 are fixed to mounting plate 221 and corresponding dumbbell pin bosses 212 by fastening screws through fastening screw holes 226 and threaded holes 216. Mounting plate 221 has a first pin 222 and a second pin 225 on its opposite and near sides of the connecting shaft 211, respectively. The first pin 222 and the second pin 225 are coaxial with the connecting shaft 211. Limiting block 24 is fixed to the first pin 222. The second pin 225 extends from the corresponding side of the connecting shaft 211 into the through hole 213 and is detachably connected to one end of dumbbell pin assembly 23 that extends into the through hole 213.

[0039] A limiting hole 224 is provided at one end of the first pin 222 away from the mounting plate 221. The axis of the limiting hole 224 is perpendicular to the axis of the first pin 222. Positioning blocks 223 are symmetrically arranged at the upper and lower ends of the first pin 222 near the mounting plate 221. The limiting block 24 is provided with a positioning groove that cooperates with the positioning block 223. The limiting block 24 is installed on the first pin 222 and its circumferential movement on the first pin 222 is restricted by the positioning block 223 and the positioning groove. A limiting pin 26 is installed in the limiting hole 224 and is used to restrict the axial movement of the limiting block 24 on the first pin 222.

[0040] like Figure 5As shown, the second pin 225 has a positioning hole 2251 at the end away from the mounting plate 221. The inner wall of the positioning hole 2251 has a U-shaped groove 2252. The outer surface of the second pin 225 near the mounting plate 221 has a plurality of first wiring grooves 2254 evenly arranged along its length. The outer surface of the second pin 225 between the U-shaped groove 2252 and the first wiring grooves 2254 has a U-shaped groove. The groove serves as the first detection part 2253. A strain sensor is attached to the first detection part 2253. The second pin 225 is detachably connected to the end of the dumbbell pin assembly 23 that extends into the through hole 213 through the U-shaped groove 2252.

[0041] like Figure 6 As shown, dumbbell pin assembly 3 23 includes mounting plate 2 231. Mounting plate 2 231 is provided with several fastening screw holes 2 236. The fastening screw holes 2 236 are provided one-to-one with the threaded holes 2 16 on the corresponding side. Dumbbell pin assembly 3 23 and dumbbell pin assembly 1 21 are fixed to mounting plate 2 231 and dumbbell pin boss 212 on the corresponding side by fastening screws through fastening screw holes 2 236 and threaded holes 2 16. The mounting plate 2 231 is provided with a third pin 232 and a fourth pin 235 on the two sides away from and close to the connecting shaft 211, respectively. The third pin 232 and the fourth pin 235 are both coaxially arranged with the connecting shaft 211. Limiting block 2 25 is installed on the third pin 232. The fourth pin 235 extends into the through hole 213 and is detachably connected to the second pin 225.

[0042] The third pin 232 has a limiting hole 234 at one end away from the mounting plate 231. The axis of the limiting hole 234 is perpendicular to the axis of the third pin 232. The third pin 232 is symmetrically provided with positioning blocks 233 at one end near the mounting plate 231. The limiting block 25 is provided with a positioning groove that cooperates with the positioning block 233. The limiting block 25 is installed on the third pin 232 and the positioning block 233 and the positioning groove restrict the circumferential movement of the limiting block 25 on the third pin 232. The limiting hole 234 is equipped with a limiting pin 27, which is used to restrict the axial movement of the limiting block 25 on the third pin 232.

[0043] like Figure 7As shown, a positioning shaft 2351 is provided at the end of the fourth pin 235 away from the mounting plate 231. The positioning shaft 2351 is correspondingly provided with the positioning hole 2251. A locking block 2352 is provided on the positioning shaft 2351 to cooperate with the loop groove 2252. The positioning shaft 2351 extends into the positioning hole 2251 and is locked in the loop groove 2252 by the locking block 2352. A plurality of second wiring grooves 2354 are evenly provided along the length direction on the outer surface of the end of the fourth pin 235 near the mounting plate 231. A rotary groove is provided on the outer surface of the fourth pin 235 located between the positioning shaft 2351 and the second wiring grooves 2354. The groove serves as the second detection part 2353, and a strain sensor is attached to the second detection part 2353.

[0044] In this embodiment, the assembly process of dumbbell pin assembly 22 and dumbbell pin assembly 23 is as follows:

[0045] The strain sensor is attached to the first detection part 2253 and the second detection part 2353, and the wires are arranged in the corresponding first wiring groove 2254 and the second wiring groove 2354. Then, the second pin 225 passes through the inner cavity 214 and the through hole 213 on the corresponding side in sequence, and the fourth pin 235 passes through the inner cavity 214 and the through hole 213 on the corresponding side in sequence. By rotating, pushing and then rotating in the opposite direction of the dumbbell pin assembly 22 and the dumbbell pin assembly 3, the U-shaped slot 2252 and the locking block 2352 achieve a locking effect. Then, the mounting plate 231 and the mounting plate 1 221 are fixed to the corresponding dumbbell pin boss 212 with fastening screws. Then, the limiting block 25 and the limiting block 1 24 are installed on the third pin and the first pin respectively. The limiting pin 1 26 and the limiting pin 27 are installed to achieve axial limiting of the limiting block 25 and the limiting block 1 24.

[0046] When the dumbbell pin breaks or falls off, the first and second detection parts inside the dumbbell pin deform, causing the strain sensor attached to it to detect the strain. At the same time, the data is guided to the detection module and wireless transmission module installed in the inner cavity. The wireless transmission module transmits the data to the user terminal, avoiding the process of manually checking the status of the dumbbell pin device one by one during maintenance, thus reducing labor intensity.

[0047] During operation, the scraper conveyor is repeatedly pushed and pulled by the hydraulic support, and the chute 1 is repeatedly bent, which causes irregular movement of the dumbbell pins. This causes the dumbbell pin bosses symmetrically arranged on both sides of the connecting shaft to be stressed, and then dumbbell pin assembly two and dumbbell pin assembly three are stressed in opposite directions. At the same time, the return groove and the locking block make dumbbell pin assembly two and dumbbell pin assembly three achieve a locking effect in the middle position. Finally, the force is detected by strain sensors in the first and second detection parts.

[0048] Example 4

[0049] 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.

[0050] Example 5

[0051] Based on embodiment 4, the fourth pin 235 and the second pin 225 are adapted to the size of the through hole 213.

[0052] Example 6

[0053] Based on Example 5, the user terminal is a centralized control platform at the construction site, or a mobile phone or computer, etc.

[0054] Example 7

[0055] Based on Example 5, the U-shaped slot and the block achieve a locking effect by rotating, pushing, and then rotating in the opposite direction with dumbbell pin assembly two and dumbbell pin assembly three.

Claims

1. A mining dumbbell pin device for self-condition monitoring, characterized in that, The device includes a dumbbell pin (2), which includes a dumbbell pin assembly 1 (21). Dumbbell pin assembly 2 (22) and dumbbell pin assembly 3 (23) are fixedly provided at both ends of dumbbell pin assembly 1 (21). Limiting block 1 (24) and limiting block 2 (25) are respectively provided at the ends of dumbbell pin assembly 2 (22) and dumbbell pin assembly 3 (23) away from dumbbell pin assembly 1 (21). Strain sensors are also attached to the parts of dumbbell pin assembly 2 (22) and dumbbell pin assembly 3 (23) that are close to dumbbell pin assembly 1 (21) and are located inside dumbbell pin assembly 1 (21). The dumbbell pin assembly (21) includes a connecting shaft (211), a through hole (213) along the center line of the shaft, dumbbell pin bosses (212) symmetrically arranged at both ends of the connecting shaft (211), an inner cavity (214) formed on the dumbbell pin bosses (212), the inner cavity (214) communicating with the through hole (213), and a buffer wear-resistant component (215) installed on one end face of the dumbbell pin bosses (212) near the connecting shaft (211). The dumbbell pin boss (212) has a plurality of threaded holes (216) evenly provided on the end face away from the connecting shaft (211). The dumbbell pin assembly two (22) and dumbbell pin assembly three (23) are respectively fixed on the corresponding dumbbell pin boss (212) through the threaded holes (216) on the corresponding side. The end of the dumbbell pin assembly two (22) and dumbbell pin assembly three (23) near the dumbbell pin assembly one (21) extends into the through hole (213) and is detachably connected in the through hole (213). The dumbbell pin assembly two (22) includes a mounting plate one (221). The mounting plate one (221) is provided with a plurality of fastening screw holes one (226). The fastening screw holes one (226) are provided one-to-one with the threaded holes (216). The dumbbell pin assembly two (22) and the dumbbell pin assembly one (21) are fixed to the mounting plate one (221) and the corresponding dumbbell pin boss (212) by fastening screws through the fastening screw holes one (226) and the threaded holes (216). The mounting plate one (221) A first pin (222) and a second pin (225) are respectively provided on the two sides away from and close to the connecting shaft (211). The first pin (222) and the second pin (225) are both coaxially arranged with the connecting shaft (211). The limiting block one (24) is fixed to the first pin (222). The second pin (225) extends from the corresponding side of the connecting shaft (211) into the through hole (213) and is detachably connected to one end of the dumbbell pin assembly three (23) that extends into the through hole (213). The first pin (222) has a limiting hole (224) at one end away from the mounting plate (221). The axis of the limiting hole (224) is perpendicular to the axis of the first pin (222). The first pin (222) has a positioning block (223) symmetrically arranged at one end near the mounting plate (221). The limiting block (24) has a positioning groove that cooperates with the positioning block (223). The limiting block (24) is installed on the first pin (222) and the positioning block (223) and positioning groove restrict the circumferential movement of the limiting block (24) on the first pin (222). The limiting hole (224) is installed with a limiting pin (26). The limiting pin (26) is used to restrict the axial movement of the limiting block (24) on the first pin (222). The second pin (225) has a positioning hole (2251) at one end away from the mounting plate (221). The inner wall of the positioning hole (2251) has a U-shaped groove (2252). The outer surface of the second pin (225) near the mounting plate (221) has a plurality of first wiring grooves (2254) evenly arranged along its length. The outer surface of the second pin (225) between the U-shaped groove (2252) and the first wiring groove (2254) has a U-shaped groove. The groove serves as a first detection part (2253). A strain sensor is attached to the first detection part (2253). The second pin (225) is detachably connected to one end of the dumbbell pin assembly (23) that extends into the through hole (213) through the U-shaped groove (2252).

2. The mining dumbbell pin device for self-status monitoring according to claim 1, characterized in that, The buffer wear-resistant component (215) includes a plurality of 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 groove (2151). The slider (2152) moves in the groove (2151) in a direction close to or away from another dumbbell pin boss (212). A buffer spring (2154) is fixedly connected to one end of the slider (2152) near the bottom of the groove (2151). The other end of the buffer spring (2154) is fixedly connected to the bottom of the groove (2151). A wear-resistant block (2153) is fixedly installed at one end of the slider (2152) away from the bottom of the groove (2151). The end face of the wear-resistant block (2153) facing the other dumbbell pin boss (212) is set as a spherical surface.

3. The mining dumbbell pin device for self-status monitoring according to claim 2, characterized in that, The dumbbell pin assembly three (23) includes a mounting plate two (231). The mounting plate two (231) is provided with a plurality of fastening screw holes two (236). The fastening screw holes two (236) are provided one-to-one with the threaded holes (216) on the corresponding side. The dumbbell pin assembly three (23) and the dumbbell pin assembly one (21) are connected by fastening screws through the fastening screw holes two (236) and the threaded holes (216) to connect the mounting plate two (231) and the dumbbell pin protrusion on the corresponding side. The platform (212) is fixed. The mounting plate (231) is provided with a third pin (232) and a fourth pin (235) on the two sides away from and close to the connecting shaft (211). The third pin (232) and the fourth pin (235) are coaxially arranged with the connecting shaft (211). The limiting block (25) is installed on the third pin (232). The fourth pin (235) extends into the through hole (213) and is detachably connected to the second pin (225).

4. The mining dumbbell pin device for self-status monitoring according to claim 3, characterized in that, The third pin (232) has a limiting hole (234) at one end away from the mounting plate (231). The axis of the limiting hole (234) is perpendicular to the axis of the third pin (232). The third pin (232) has a positioning block (233) symmetrically arranged at one end near the mounting plate (231). The limiting block (25) has a positioning groove that cooperates with the positioning block (233). The limiting block (25) is installed on the third pin (232) and the positioning block (233) and positioning groove restrict the circumferential movement of the limiting block (25) on the third pin (232). The limiting hole (234) is equipped with a limiting pin (27), which is used to restrict the axial movement of the limiting block (25) on the third pin (232).

5. The mining dumbbell pin device for self-status monitoring according to claim 4, characterized in that, The fourth pin (235) has a positioning shaft (2351) at the end away from the mounting plate (231). The positioning shaft (2351) is corresponding to the positioning hole (2251). The positioning shaft (2351) is provided with a locking block (2352) that cooperates with the loop groove (2252). The positioning shaft (2351) extends into the positioning hole (2251) and is locked in the loop groove (2252) by the locking block (2352). The outer surface of the fourth pin (235) near the mounting plate (231) has a plurality of second wiring grooves (2354) evenly arranged along its length. The outer surface of the fourth pin (235) between the positioning shaft (2351) and the second wiring grooves (2354) is provided with a rotary groove. The groove serves as a second detection part (2353). A strain sensor is attached to the second detection part (2353).

6. The mining dumbbell pin device for self-status monitoring according to claim 5, characterized in that, The inner cavity (214) is equipped with a detection module, a wireless transmission module and a power supply. The detection module and the wireless transmission module are connected to the power supply through wires. The detection module and the wireless transmission module are electrically connected through wires. The wireless transmission module is also connected to the user terminal through wireless transmission. The strain sensor is connected to the detection module through wires. The connecting wires of the strain sensor and the detection module are arranged in the corresponding second wiring groove (2354) or first wiring groove (2254).

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