Coal mine goaf overlying strata stability monitoring device

Abstract

The invention belongs to the technical field of goaf detection, and particularly relates to a coal mine goaf overlying strata stability monitoring device which comprises a goaf monitoring device and a bottom plate, a supporting cylinder is fixedly connected to the middle of the lower end face of the bottom plate, a conical head is fixedly connected to the lower end of the supporting cylinder, and a plurality of spring dampers are fixedly connected to the upper end face of the bottom plate. The piston end of the spring damper is fixedly connected with the bottom of the goaf monitoring device, and the goaf monitoring device is further provided with a pulley transmission type foreign matter removing mechanism for preventing foreign matter from making contact with the goaf monitoring device. By utilizing the pulley transmission type foreign matter removing mechanism and the anti-winding assembly, foreign matters on all surfaces of the goaf monitoring device can be pushed, so that the foreign matters are separated from the goaf monitoring device, and the situation that the foreign matters are in contact with the goaf monitoring device and block sensors of the goaf monitoring device is avoided; the sensor cannot accurately sense the stability change of the overlying strata, so that the accuracy of monitoring data is influenced.

Description

Technical Field

[0001] The invention belongs to the technical field of goaf detection, in particular to a device for monitoring the stability of overburden in a goaf of a coal mine. Background Art

[0002] After the underground ore layer in a mining area is mined, a large goaf is usually left behind. The goaf will pose a certain safety hazard to the production of the mining area. People and mechanical equipment may fall into the goaf and be injured. Therefore, it is necessary to use monitoring devices to monitor the status of the overburden in real time, so as to play a certain early warning role.

[0003] The patent with announcement number CN211603568U discloses a goaf overburden stability monitoring system, including a goaf monitoring device and a wire pipe retraction and extension structure. The goaf monitoring device includes a goaf data monitoring box and a monitoring wire pipe. A plug connector is provided on one side of the goaf data monitoring box, and a goaf data upload box is fixed to the top of the goaf data monitoring box. A solar power supply panel is fixed to the top of the goaf data upload box. The solar power supply panel and the goaf data monitoring box are electrically connected. The monitoring wire pipe of this patent is fixed above the fixed rod base through the wire pipe retraction and extension structure. The wire pipe retraction and extension structure includes a wire pipe retraction and extension reel and a reel handle. When it is necessary to monitor the goaf overburden, the monitoring wire pipe can be quickly retracted and extended through the wire pipe retraction and extension structure, which improves the wiring efficiency of the monitoring wire pipe, facilitates the monitoring of the goaf overburden stability, and is more practical.

[0004] However, the above technical solution still has the following deficiencies in practical application: The goaf monitoring device is installed on the overburden of the goaf by plugging, and then stability monitoring is performed through the goaf monitoring device. However, during the monitoring process of the goaf monitoring device, due to the complexity of the mining environment, foreign objects such as coal blocks, iron rods, and traction ropes are usually moved to the goaf monitoring device under the action of wind or vibration of mechanical equipment. When foreign objects come into contact with the goaf monitoring device, not only may they block the sensor of the goaf monitoring device, causing the sensor to be unable to accurately sense the stability changes of the overburden, thereby affecting the accuracy of the monitoring data, but they may also cause the goaf monitoring device to be damaged due to long-term squeezing by foreign objects. Summary of the Invention

[0005] In order to remedy the deficiencies of the prior art and solve at least one technical problem raised in the background art, the present invention proposes a device for monitoring the stability of overburden in a coal mine goaf.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a coal mine goaf overburden stability monitoring device, comprising a goaf monitoring device and a bottom plate, a support tube fixedly connected to the middle of the lower end surface of the bottom plate, a cone head fixedly connected to the lower end of the support tube, a plurality of spring dampers fixedly connected to the upper end surface of the bottom plate, the piston ends of the spring dampers fixedly connected to the bottom of the goaf monitoring device, and a pulley-driven foreign matter removal mechanism for preventing foreign matter from contacting the goaf monitoring device; The pulley-driven foreign matter removal mechanism includes a displacement plate slidably connected to one side of the bottom of the goaf monitoring device, and concave rods are rotatably provided at both ends of the displacement plate. The concave rods are fitted with the upper side and both side surfaces of the goaf monitoring device, and a plurality of pulleys are horizontally arranged and rotatably provided in the inner cavity on the upper side of the concave rod.

[0007] Preferably, one side of the displacement plate is threadedly connected to a threaded rod one, both ends of the threaded rod one are rotatably set at the bottom of the goaf monitoring device, one side of the lower end of the goaf monitoring device is fixedly connected to a motor three, and the output end of the motor three is fixedly connected to one end of the threaded rod one.

[0008] Preferably, a sliding column is fixedly connected to one side of the lower end face of the goaf monitoring device, the sliding column is plugged into and slidably connected to a sleeve, the lower end of the sleeve is fixedly connected to the bottom plate, and a pressure sensor is fixedly connected to the bottom of the inner cavity of the sleeve.

[0009] Preferably, one end of the displacement plate is fixedly connected to motor 1, and the output end of motor 1 is fixedly connected to one end of the displacement plate.

[0010] Preferably, a worm wheel is fixedly connected to the connection between the pulley and the concave rod, worms are rotatably provided on both sides of the upper end of the concave rod, multiple sections of worm teeth are provided on the worm, the worm teeth on the worm are engaged with the worm wheel, and a motor five is fixedly connected to one side of the upper end of the concave rod, and the output end of the motor five is fixedly connected to one end of the worm.

[0011] Preferably, the concave rod is further provided with an anti-winding component; The anti-winding component includes a blade plate 2 that is slidably connected to one side of the upper end of the concave rod, a blade 2 is fixedly connected to one side of the upper end surface of the blade plate 2, and blade plates 1 are plugged and slidably connected on both sides of the concave rod, and blade plate 1 is fixedly connected to one side of the blade plate 1.

[0012] Preferably, one side of the upper end of the concave rod is fixedly connected to an electric push rod, and the piston end of the electric push rod is fixedly connected to one side of the blade plate.

[0013] Preferably, one side of the blade plate is rotatably provided with connecting rod 2, one end of the connecting rod 2 is rotatably provided with connecting rod 1, one end of the connecting rod 1 is rotatably provided on the concave rod, both ends of the concave rod are fixedly connected with motor 2, and the output end of motor 2 is fixedly connected to one end of connecting rod 1.

[0014] Preferably, a reinforcement component is further provided on the support cylinder; The reinforcement assembly includes a fastening rod slidably connected to both sides of the lower end of the support tube, one end of the fastening rod is rotatably provided with a connecting rod three, and one end of the connecting rod three is rotatably provided with a threaded block.

[0015] Preferably, one side of the threaded block is threadedly connected to a threaded rod 2, the upper end of the threaded rod 2 is rotatably set in the inner cavity of the support tube, one side of the inner cavity of the support tube is fixedly connected to a motor 4, and the output end of the motor 4 is fixedly connected to one end of the threaded rod 2.

[0016] The beneficial effects of the present invention are as follows: 1. The device for monitoring the stability of overburden in goaf of coal mines described in the present invention utilizes a pulley-driven foreign matter removing mechanism and an anti-winding component. When a foreign matter contacts the goaf monitoring device, the pressure sensor detects a pressure signal, and the concave rod slides and rotates back and forth on the surface of the goaf monitoring device, pushing the foreign matter on each surface of the goaf monitoring device to make the foreign matter separate from the goaf monitoring device, thereby avoiding the situation where the foreign matter contacts the goaf monitoring device and blocks the sensor of the goaf monitoring device, causing the sensor to be unable to accurately sense the stability change of the overburden, thereby affecting the accuracy of the monitoring data. At the same time, it also avoids the situation where the goaf monitoring device is damaged due to being squeezed by foreign matter for a long time. In addition, by driving multiple pulleys to rotate simultaneously, the pulleys will push the foreign matter in contact with the concave rod when the pulleys rotate. The foreign matter exerts friction to make it slide laterally until it falls off from the upper end of the concave rod, thereby avoiding the situation where the foreign matter leaning against the left and right sides of the goaf monitoring device is long, and the foreign matter is lifted only for a short time during the process of the concave rod pushing it, and then still leans against the left and right sides of the goaf monitoring device, further ensuring the removal effect of foreign matter leaning against the two sides of the goaf monitoring device. At the same time, by driving the second blade plate upward and moving the first blade laterally, the traction rope and cable wrapped around the concave rod can be cut off with the cooperation of the first blade and the second blade, and pushed down in conjunction with the lateral movement of the concave rod, thereby avoiding the situation where the traction rope, cable and other foreign matter are wrapped around the concave rod, and it is difficult to make them fall off only by the lateral movement of the concave rod, and the sensor of the goaf monitoring device is still covered.

[0017] 2. The present invention relates to a device for monitoring the stability of overburden in a coal mine goaf. After the support tube is rooted in the overburden in the goaf, the motor 4 can drive the threaded rod 2 to rotate, so that the threaded block moves downward. The threaded block uses the connecting rod 3 on both sides to drive the two fastening rods to move in different directions at the same time, so that the fastening rods are inserted into the ground, thereby further improving the stability of the support tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the goaf monitoring device; Figure 3 yes Figure 2 A partial enlarged view of the middle part; Figure 4 It is a schematic diagram of the three-dimensional structure at the concave rod; Figure 5 yes Figure 4 A partial enlarged view of point B in the middle; Figure 6 Schematic diagram of the three-dimensional structure at the displacement plate; Figure 7 yes Figure 6 A partial enlarged view of point C in the middle; Figure 8 It is a schematic diagram of the three-dimensional structure at the pulley; Figure 9 It is a schematic diagram of the three-dimensional structure of the thread block.

[0020] In the figure: 1. Goaf monitoring device; 2. Bottom plate; 3. Support tube; 4. Fastening rod; 5. Cone head; 6. Spring damper; 7. Concave rod; 8. Sliding column; 9. Sleeve; 10. Pressure sensor; 11. Displacement plate; 12. Motor 1; 13. Pulley; 14. Worm; 15. Blade 1; 16. Motor 2; 17. Connecting rod 1; 18. Connecting rod 2; 19. Motor 3; 20. Threaded rod 1; 21. Blade plate 2; 22. Electric push rod; 23. Worm gear; 24. Motor 4; 25. Threaded rod 2; 26. Threaded block; 27. Connecting rod 3; 28. Blade 2; 29. ​​Blade plate 1; 30. Motor 5. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Please refer to Figures 1-8 The present invention provides a technical solution: a coal mine goaf overburden stability monitoring device, comprising a goaf monitoring device 1 and a bottom plate 2, wherein a support tube 3 is fixedly connected to the middle of the lower end surface of the bottom plate 2, a cone head 5 is fixedly connected to the lower end of the support tube 3, and a plurality of spring dampers 6 are fixedly connected to the upper end surface of the bottom plate 2, wherein the piston end of the spring damper 6 is fixedly connected to the bottom of the goaf monitoring device 1, and a pulley-driven foreign matter removal mechanism is further provided on the goaf monitoring device 1 to prevent foreign matter from contacting the goaf monitoring device 1; The pulley-driven foreign matter removal mechanism includes a displacement plate 11 slidably connected to one side of the bottom of the goaf monitoring device 1. Concave rods 7 are rotatably provided at both ends of the displacement plate 11. The concave rods 7 are fitted with the upper side and both side surfaces of the goaf monitoring device 1. A plurality of pulleys 13 are horizontally arranged and rotatably provided in the inner cavity on the upper side of the concave rod 7.

[0023] In this embodiment, Figures 1-8 As shown, a threaded rod 20 is threadedly connected to one side of the displacement plate 11, and both ends of the threaded rod 20 are rotatably set at the bottom of the goaf monitoring device 1. A motor 3 19 is fixedly connected to one side of the lower end of the goaf monitoring device 1, and the output end of the motor 3 19 is fixedly connected to one end of the threaded rod 20.

[0024] A sliding column 8 is fixedly connected to one side of the lower end surface of the goaf monitoring device 1. The sliding column 8 is inserted and slidably connected to a sleeve 9. The lower end of the sleeve 9 is fixedly connected to the bottom plate 2. The bottom of the inner cavity of the sleeve 9 is fixedly connected to a pressure sensor 10.

[0025] One end of the displacement plate 11 is fixedly connected to the motor 12 , and the output end of the motor 12 is fixedly connected to one end of the displacement plate 11 .

[0026] A worm wheel 23 is fixedly connected to the connection between the pulley 13 and the concave rod 7. Worms 14 are rotatably provided on both sides of the upper end of the concave rod 7. The worm 14 is provided with multiple sections of worm teeth. The worm teeth on the worm 14 are engaged with the worm wheel 23. A motor 5 30 is fixedly connected to one side of the upper end of the concave rod 7, and the output end of the motor 5 30 is fixedly connected to one end of the worm 14.

[0027] The concave rod 7 is also provided with an anti-winding component; The anti-winding component includes a blade plate 21 slidably connected to one side of the upper end of the concave rod 7, a blade 28 is fixedly connected to one side of the upper end surface of the blade plate 21, and blade plates 1 29 are plugged and slidably connected on both sides of the concave rod 7, and a blade 15 is fixedly connected to one side of the blade plate 29.

[0028] One side of the upper end of the concave rod 7 is fixedly connected to an electric push rod 22, and the piston end of the electric push rod 22 is fixedly connected to one side of the blade plate 21.

[0029] A connecting rod 2 18 is rotatably provided on one side of the blade plate 1 29, and a connecting rod 17 is rotatably provided on one end of the connecting rod 18. One end of the connecting rod 17 is rotatably provided on the concave rod 7. Both ends of the concave rod 7 are fixedly connected to the motor 2 16, and the output end of the motor 2 16 is fixedly connected to one end of the connecting rod 17.

[0030] Specifically, in the prior art, the goaf monitoring device 1 is installed on the overburden of the goaf by plugging, and then the stability monitoring is performed by the goaf monitoring device 1. However, during the monitoring process of the goaf monitoring device 1, due to the complexity of the mining environment, foreign objects such as coal blocks, iron rods, and traction ropes are usually moved to the goaf monitoring device 1 by wind or vibration of mechanical equipment. When the foreign objects come into contact with the goaf monitoring device 1, not only may the sensors of the goaf monitoring device 1 be blocked, causing the sensors to be unable to accurately sense the stability changes of the overburden, thereby affecting the accuracy of the monitoring data, but the goaf monitoring device 1 may also be damaged due to being squeezed by foreign objects for a long time. Therefore, in order to solve the above problems, when using this embodiment, the support tube 3 is rooted into the overburden of the goaf through the cone head 5 until the bottom plate 2 and the overburden are in contact with each other, so that the goaf monitoring device 1 can be installed and the stability of the overburden can be monitored in real time using the goaf monitoring device 1. When a foreign object comes into contact with the goaf monitoring device 1, the goaf monitoring device 1 will move downward due to the squeezing of the foreign object, causing the sliding column 8 to contact the pressure sensor 10. When the pressure sensor 10 detects a pressure signal, the motor 3 19 drives the threaded rod 1 20 to rotate, causing the displacement plate 11 to slide laterally at the bottom of the goaf monitoring device 1, which can drive the concave rod 7 to slide back and forth on the surface of the goaf monitoring device 1. When the concave rod 7 slides, it can push the foreign objects on the upper surface and front and back surfaces of the goaf monitoring device 1, and when the concave rod 7 moves to the left and right ends of the goaf monitoring device 1, the motor 12 will drive the concave rod 7 to rotate in the displacement direction of the goaf monitoring device 1. The concave rod 7 is a spring-loaded spring which is used to push the foreign objects on the left and right sides of the goaf monitoring device 1, thereby making the foreign objects in contact with each side of the goaf monitoring device 1 be pushed by the concave rod 7, so that the foreign objects are separated from the goaf monitoring device 1, thereby avoiding the situation where the foreign objects contact the goaf monitoring device 1 and block the sensors of the goaf monitoring device 1, causing the sensors to be unable to accurately sense the stability changes of the overburden, thereby affecting the accuracy of the monitoring data. At the same time, it also avoids the situation where the goaf monitoring device 1 is damaged due to being squeezed by foreign objects for a long time. When the goaf monitoring device 1 is no longer squeezed by the external force of the foreign objects, the sliding column 8 is reset under the action of the spring damper 6, and the concave rod 7 stops working. Although the above method can remove foreign objects in contact with the goaf monitoring device 1, when foreign objects such as discarded traction ropes and cables come into contact with the concave rod 7, they may be entangled in the concave rod 7. It may be difficult to remove them by simply moving the concave rod 7 horizontally, and the sensors of the goaf monitoring device 1 may still be covered. In addition, in some cases, when the foreign objects leaning against the left and right sides of the goaf monitoring device 1 are long, the foreign objects may be lifted up for only a short time during the process of being pushed by the concave rod 7, and then still lean against the left and right sides of the goaf monitoring device 1, thereby affecting the effect of removing foreign objects. Therefore, in order to avoid this situation, when the concave rod 7 moves horizontally for a period of time, if the sliding column 8 still does not reset, when the concave rod 7 moves to the left and right sides of the goaf monitoring device 1, the motor 5 30 drives the worm 14 to rotate, and the multiple worm teeth on the worm 14 cause the multiple worm wheels 23 to rotate simultaneously, so that the multiple pulleys 13 rotate simultaneously. When the pulley 13 rotates, it will The foreign matter in contact with the concave rod 7 exerts friction force to make it slide laterally until it falls off from the upper end of the concave rod 7, thereby avoiding the situation that the foreign matter is long and is lifted up for a short time during the pushing process of the concave rod 7, and then still leans against the left and right sides of the goaf monitoring device 1, further ensuring the removal effect of the foreign matter leaning against the two sides of the goaf monitoring device 1. At the same time, the electric push rod 22 drives the blade plate 21 to move upward, and the motor 2 16 drives the continuous Rod 17 and connecting rod 2 18 rotate, causing blade plate 1 29 to slide on both sides of the concave rod 7, causing blade 15 to move laterally. With the cooperation of blade 15 and blade 2 28, the traction rope and cable wrapped around the concave rod 7 can be cut off, and the concave rod 7 can be pushed down in conjunction with the lateral movement of the concave rod 7, thereby avoiding the situation where foreign objects such as traction ropes and cables are wrapped around the concave rod 7 and it is difficult to make them fall off only by the lateral movement of the concave rod 7, and the sensor of the goaf monitoring device 1 is still covered.

[0031] In this embodiment, Figure 9 As shown, a reinforcement component is also provided on the support tube 3; The reinforcement assembly includes a fastening rod 4 slidably connected to both sides of the lower end of the support tube 3, one end of the fastening rod 4 is rotatably provided with a connecting rod 3 27, and one end of the connecting rod 3 27 is rotatably provided with a threaded block 26.

[0032] One side of the threaded block 26 is threadedly connected to a threaded rod 25, and the upper end of the threaded rod 25 is rotatably set in the inner cavity of the support tube 3. One side of the inner cavity of the support tube 3 is fixedly connected to a motor 4 24, and the output end of the motor 4 24 is fixedly connected to one end of the threaded rod 25.

[0033] Specifically, after the support tube 3 is rooted in the overburden of the goaf, the motor 4 24 can drive the threaded rod 2 25 to rotate, so that the threaded block 26 moves downward. The threaded block 26 uses the connecting rod 3 27 on both sides to drive the two fastening rods 4 to move in different directions at the same time, so that the fastening rods 4 are inserted into the ground, thereby further improving the stability of the support tube 3.

[0034] Working principle: The support tube 3 is rooted into the overburden of the goaf through the cone head 5 until the bottom plate 2 is in contact with the overburden, and the motor four 24 drives the threaded rod two 25 to rotate, so that the threaded block 26 moves downward, and the threaded block 26 uses the connecting rod three 27 on both sides to drive the two fastening rods 4 to move in different directions at the same time, so that the fastening rod 4 is inserted into the ground, thereby further improving the stability of the support tube 3, and the installation of the goaf monitoring device 1 can be realized, and the goaf monitoring device 1 can be used to monitor the stability of the overburden in real time; when a foreign object comes into contact with the goaf monitoring device 1, the goaf monitoring device 1 will move downward due to the squeezing of the foreign object, so that the sliding column 8 comes into contact with the pressure sensor 10, and when the pressure sensor 10 detects a pressure signal, the motor three 19 drives the threaded rod one 20 to rotate, so that the displacement plate 11 slides laterally at the bottom of the goaf monitoring device 1, which can drive the concave rod 7 to slide back and forth on the surface of the goaf monitoring device 1, and the concave rod 7 slides When the lever 7 is moved to the left or right end of the gear 1, the motor 12 will drive the lever 7 to rotate in the direction of displacement of the gear 1 to push the foreign objects leaning against the left and right sides of the gear 1, so that the foreign objects in contact with each side of the gear 1 can be pushed by the lever 7, so that the foreign objects are separated from the gear 1, thereby avoiding the contact between the foreign objects and the gear 1 and the foreign objects blocking the sensor of the gear 1, causing the sensor to be unable to accurately sense the stability change of the overburden, thereby affecting the accuracy of the monitoring data, and at the same time, avoiding the damage of the gear 1 due to being squeezed by foreign objects for a long time; when the gear 1 is no longer squeezed by the external force of the foreign objects, the sliding column 8 will be reset under the action of the spring damper 6, and the lever 7 will stop working;Although the above method can remove foreign objects in contact with the goaf monitoring device 1, when foreign objects such as discarded traction ropes and cables come into contact with the concave rod 7, they may be entangled in the concave rod 7. It may be difficult to remove them by simply moving the concave rod 7 horizontally, and the sensors of the goaf monitoring device 1 may still be covered. In addition, in some cases, when the foreign objects leaning against the left and right sides of the goaf monitoring device 1 are long, the foreign objects may be lifted up for only a short time during the process of being pushed by the concave rod 7, and then still lean against the left and right sides of the goaf monitoring device 1, thereby affecting the effect of removing foreign objects. Therefore, in order to avoid this situation, when the concave rod 7 moves horizontally for a period of time, if the sliding column 8 still does not reset, when the concave rod 7 moves to the left and right sides of the goaf monitoring device 1, the motor 5 30 drives the worm 14 to rotate, and the multiple worm teeth on the worm 14 cause the multiple worm wheels 23 to rotate simultaneously, so that the multiple pulleys 13 rotate simultaneously. When the pulley 13 rotates, it will The foreign matter in contact with the concave rod 7 exerts friction force to make it slide laterally until it falls off from the upper end of the concave rod 7, thereby avoiding the situation that the foreign matter is long and is lifted up for a short time during the pushing process of the concave rod 7, and then still leans against the left and right sides of the goaf monitoring device 1, further ensuring the removal effect of the foreign matter leaning against the two sides of the goaf monitoring device 1. At the same time, the electric push rod 22 drives the blade plate 21 to move upward, and the motor 2 16 drives the continuous The rotation of rod 17 and connecting rod 2 18 causes blade plate 1 29 to slide on both sides of concave rod 7, causing blade 15 to move laterally. With the cooperation of blade 15 and blade 2 28, the traction rope or cable wrapped around concave rod 7 is cut and pushed off in conjunction with the lateral movement of concave rod 7. This prevents foreign objects such as traction ropes and cables from being entangled in concave rod 7 and being difficult to remove by the lateral movement of concave rod 7 alone, thereby preventing the sensors of goaf monitoring device 1 from being covered.

[0035] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for monitoring the stability of overburden in a coal mine goaf, comprising a goaf monitoring device (1) and a floor (2), characterized in that: A support cylinder (3) is fixedly connected to the middle of the lower end surface of the bottom plate (2), a cone head (5) is fixedly connected to the lower end of the support cylinder (3), and a plurality of spring dampers (6) are fixedly connected to the upper end surface of the bottom plate (2), the piston end of the spring damper (6) is fixedly connected to the bottom of the goaf monitoring device (1), and the goaf monitoring device (1) is also provided with a pulley transmission type foreign matter removal mechanism for preventing foreign matter from contacting the goaf monitoring device (1); The pulley-driven foreign matter removal mechanism comprises a displacement plate (11) slidably connected to one side of the bottom of the goaf monitoring device (1), and concave rods (7) are rotatably provided at both ends of the displacement plate (11). The concave rods (7) are in contact with the upper side and both side surfaces of the goaf monitoring device (1), and a plurality of pulleys (13) are rotatably provided in the inner cavity on the upper side of the concave rod (7).

2. The device for monitoring the stability of overburden in a coal mine goaf according to claim 1, characterized in that: One side of the displacement plate (11) is threadedly connected to a threaded rod (20), both ends of the threaded rod (20) are rotatably arranged at the bottom of the goaf monitoring device (1), and one side of the lower end of the goaf monitoring device (1) is fixedly connected to a motor (19), and the output end of the motor (19) is fixedly connected to one end of the threaded rod (20).

3. The device for monitoring the stability of overburden in a coal mine goaf according to claim 1, characterized in that: A sliding column (8) is fixedly connected to one side of the lower end surface of the goaf monitoring device (1); the sliding column (8) is plugged into and slidably connected to a sleeve (9); the lower end of the sleeve (9) is fixedly connected to the bottom plate (2); and the bottom of the inner cavity of the sleeve (9) is fixedly connected to a pressure sensor (10).

4. The device for monitoring the stability of overburden in a coal mine goaf according to claim 1, characterized in that: One end of the displacement plate (11) is fixedly connected to a motor 1 (12), and an output end of the motor 1 (12) is fixedly connected to one end of the displacement plate (11).

5. The device for monitoring the stability of overburden in coal mine goaf according to claim 1, characterized in that: A worm wheel (23) is fixedly connected to the connection between the pulley (13) and the concave rod (7), and worms (14) are rotatably provided on both sides of the upper end of the concave rod (7). The worms (14) are provided with multiple sections of worm teeth, and the worm teeth on the worm (14) and the worm wheel (23) are meshed with each other. A motor five (30) is fixedly connected to one side of the upper end of the concave rod (7), and the output end of the motor five (30) is fixedly connected to one end of the worm (14).

6. The device for monitoring the stability of overburden in a coal mine goaf according to claim 1, characterized in that: The concave rod (7) is also provided with an anti-winding component; The anti-winding component comprises a blade plate 2 (21) slidably connected to one side of the upper end of the concave rod (7), a blade plate 2 (28) being fixedly connected to one side of the upper end surface of the blade plate 2 (21), and blade plates 1 (29) being plugged and slidably connected to both sides of the concave rod (7), and blade plate 1 (15) being fixedly connected to one side of the blade plate 1 (29).

7. The device for monitoring the stability of overburden in a coal mine goaf according to claim 6, characterized in that: One side of the upper end of the concave rod (7) is fixedly connected to an electric push rod (22), and the piston end of the electric push rod (22) is fixedly connected to one side of the blade plate (21).

8. The device for monitoring the stability of overburden in a coal mine goaf according to claim 6, characterized in that: One side of the blade plate (29) is rotatably provided with a connecting rod (18), one end of the connecting rod (18) is rotatably provided with a connecting rod (17), one end of the connecting rod (17) is rotatably provided on the concave rod (7), both ends of the concave rod (7) are fixedly connected with a motor (16), and the output end of the motor (16) is fixedly connected to one end of the connecting rod (17).

9. The device for monitoring the stability of overburden in a coal mine goaf according to claim 1, characterized in that: The support cylinder (3) is also provided with a reinforcement component; The reinforcement assembly comprises a fastening rod (4) slidably connected to both sides of the lower end of the support tube (3), one end of the fastening rod (4) is rotatably provided with a connecting rod three (27), and one end of the connecting rod three (27) is rotatably provided with a threaded block (26).

10. The device for monitoring the stability of overburden in coal mine goaf according to claim 9, characterized in that: One side of the threaded block (26) is threadedly connected to a second threaded rod (25), the upper end of the second threaded rod (25) is rotatably arranged in the inner cavity of the support tube (3), and one side of the inner cavity of the support tube (3) is fixedly connected to a fourth motor (24), and the output end of the fourth motor (24) is fixedly connected to one end of the second threaded rod (25).

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