Mining overlying strata movement and surrounding rock damage monitoring and early warning device

Abstract

The invention discloses a mining overlying strata movement and surrounding rock damage monitoring and early warning device which comprises a cylinder inserted into the inner side of a monitored rock mass, two opposite supporting strips are arranged on the outer wall of the cylinder in a deflectable mode, a distance measuring assembly is installed on the cylinder, an adjusting rod is axially inserted into the bottom of the cylinder, and an action mechanism is arranged in the cylinder. The action mechanism is driven by the adjusting rod to axially move towards the interior of the cylinder, the bottom of the supporting strip can be guided to centrifugally deflect outwards to abut against the inner wall of the monitored rock mass, and then initial distance measurement of the distance measurement assembly is guided and adjusted. By arranging the cylinder, the adjusting rod, the supporting strip, the distance measuring assembly, the action mechanism, the data processing equipment and the alarm equipment, during installation, fixing of the device and rapid adjustment of initial distance measurement of the distance measuring assembly can be achieved in sequence only by operating the adjusting rod.

Description

Technical Field

[0001] The invention relates to the technical field of rock mass monitoring, and in particular to a monitoring and early warning device for overburden movement and surrounding rock damage caused by mining. Background Art

[0002] Overburden movement due to mining refers to the phenomenon that the overburden strata move and deform due to the mining of coal seams during the coal mining process. Surrounding rock damage refers to the stress balance state of the rock mass around the underground space being broken due to excavation activities during underground engineering excavation or mining, thereby causing a series of destructive phenomena such as deformation, cracking, sliding, and collapse of the rock mass. The above-mentioned destructive phenomena not only affect the stability and safety of the project, but may also lead to serious safety accidents. In this regard, the present invention provides a monitoring and early warning device for overburden movement and surrounding rock damage due to mining to solve the above-mentioned problems. Summary of the invention

[0003] In order to solve the technical problems raised in the above-mentioned background technology, the present invention provides a monitoring and early warning device for overburden movement and surrounding rock damage caused by mining.

[0004] The present invention is implemented by the following technical scheme: a monitoring and early warning device for overburden movement and surrounding rock damage caused by mining, comprising a cylinder inserted into the inner side of a monitoring rock body, two opposing struts being rotatably arranged on the outer wall of the cylinder, a distance measuring assembly being installed on the cylinder, an adjusting rod being axially inserted into the bottom of the cylinder, an action mechanism being arranged inside the cylinder, the action mechanism being driven by the axial movement of the adjusting rod toward the inside of the cylinder, and being able to first guide the bottom of the strut to be centrifugally deflected outwards until it abuts against the inner wall of the monitoring rock body, and then guiding the initial distance measurement of the distance measuring assembly;

[0005] Among them, the monitoring and early warning device for overburden movement and surrounding rock damage caused by mining also includes data processing equipment and alarm equipment. The ranging component is used to monitor the deformation generated in the monitoring rock body at all times, and the data processing equipment is used to determine whether the deformation in the monitoring rock body is greater than a predetermined threshold. If it is greater, the alarm equipment is controlled to send an alarm signal.

[0006] As a further improvement of the above solution, the action mechanism includes a first cylinder body concentrically arranged inside the cylinder, and the bottom of the first cylinder body is sleeved on the top of the adjusting rod.

[0007] The first cylinder has a first transmission assembly, which is driven by the adjusting rod to extend and move axially relative to the first cylinder, and can guide the first cylinder to rotate in one direction.

[0008] A second transmission assembly is arranged in the cylinder, and the second transmission assembly is driven by the unidirectional rotation of the first cylinder, and can guide the bottom of the strut to deflect centrifugally outward;

[0009] A third transmission assembly is arranged in the cylinder, and the third transmission assembly is driven by the movement of the adjusting rod extending axially, and can adjust the initial distance between the distance measuring assembly and the inner side of the monitoring rock body.

[0010] As a further improvement of the above solution, the first transmission assembly includes a first protrusion fixed on the outer wall of the adjusting rod, and the inner wall of the first cylinder body is provided with a first spiral groove, and the first protrusion is slidably engaged in the first groove.

[0011] As a further improvement of the above scheme, the second transmission assembly includes a first ring body that is sleeved and fixed on the outside of the adjusting rod, a second ring body that is sleeved and fixed on the outside of the first cylinder, two radially extending first limit grooves are relatively formed on the annular surface of the first ring body, and two centripetally curved second limit grooves are relatively formed on the annular surface of the second ring body, a limit rod parallel to the adjusting rod is slidably provided in the first limit groove, a limit sleeve parallel to the adjusting rod is slidably provided in the second limit groove, and the top of the limit rod is slidably inserted in the bottom of the limit sleeve; a first connecting rod is radially arranged on the outer wall of the limit sleeve away from the adjusting rod, and one end of the first connecting rod is pinned to the outer wall of the support bar.

[0012] As a further improvement of the above scheme, the third transmission assembly includes a second cylinder body rotatably inserted inside the cylinder, the bottom of the second cylinder body is sleeved on the top of the first cylinder body, the inner wall of the first cylinder body is axially provided with a second groove which is slidably engaged with the first protrusion, and the bottom of the second groove is connected to the top of the first groove.

[0013] A fourth transmission assembly is arranged inside the cylinder, and the fourth transmission assembly is driven by the unidirectional rotation of the second cylinder body, and can adjust the initial distance between the distance measuring assembly and the inner side of the monitoring rock body.

[0014] As a further improvement of the above scheme, the fourth transmission assembly includes a second protrusion arranged on the outer wall of the first cylinder, the inner wall of the second cylinder is respectively provided with a third groove extending circumferentially and a fourth groove in the axial direction of a spiral line from bottom to top, the third groove is connected to the fourth groove, and the third groove and the fourth groove are both slidably engaged with the second protrusion, an elastic connection is arranged between the top of the first cylinder and the inner wall of the second cylinder, a second connecting rod is concentrically fixed on the top of the second cylinder, a first bevel tooth is arranged on the top of the second connecting rod, a third cylinder is radially rotatably inserted inside the cylinder, a second bevel tooth matching the first bevel tooth is sleeved and fixed on the outer side of the third cylinder, a third connecting rod is threadedly inserted at both ends of the third cylinder, a receiving groove for accommodating a distance measuring assembly is arranged on the outer wall of the cylinder, a mounting plate is arranged in the receiving groove, one end of the third connecting rod is connected to one side of the mounting plate, the distance measuring assembly is arranged on the other side of the mounting plate, and a telescopic rod is arranged between the mounting plate and the receiving groove.

[0015] As a further improvement of the above solution, a spring is arranged between the top of the first cylinder and the inner wall of the second cylinder, and when the first cylinder axially extends into the second cylinder, the spring is compressed and deformed.

[0016] As a further improvement of the above solution, a third limiting groove is axially opened on the outer wall of the limiting sleeve, and the centripetal end of the first connecting rod is slidably clamped in the third limiting groove.

[0017] As a further improvement of the above solution, when the first protrusion is located at the bottom of the first groove, the second protrusion is located at one end of the third groove, and the first connecting rod is located at the top of the third limiting groove;

[0018] When the first protrusion is located at the top of the first groove, the second protrusion is located at the other end of the third groove, and the first connecting rod is located at the top of the third limiting groove;

[0019] When the first protrusion is located at the top of the second groove, the second protrusion is located at the other end of the third groove, the first connecting rod is located at the top of the third limiting groove, and the limiting rod is completely inserted into the limiting sleeve.

[0020] When the second protrusion is located at the top of the fourth groove, the first connecting rod is located at the bottom of the third limiting groove.

[0021] As a further improvement of the above solution, the distance measuring component is a laser rangefinder.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The monitoring and early warning device for overburden movement and surrounding rock damage caused by mining of the present invention can monitor and issue decision-making alarms on the deformation amount generated in the rock mass when overburden movement and surrounding rock damage are caused by mining by arranging columns, adjusting rods, struts, distance measuring components, action mechanisms, data processing equipment and alarm equipment. At the same time, during installation, only the adjusting rod needs to be operated to realize the rapid adjustment of the fixation of the device and the initial distance measuring of the distance measuring components in sequence. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention after being installed on the monitoring rock mass;

[0025] Figure 2 for Figure 1 The figure is a schematic diagram of the three-dimensional cross-sectional structure of the whole after installation;

[0026] Figure 3 for Figure 2 The main cross-sectional structure diagram of the whole after installation (the stays are unfolded and the distance measuring components protrude from the receiving groove);

[0027] Figure 4 for Figure 2 The schematic diagram of the main cross-sectional structure of the whole in the initial state when it is not installed (the stays are not unfolded and the distance measuring components are stored in the receiving groove);

[0028] Figure 5 for Figure 4 The main cross-sectional structure diagram of the whole when it is installed (the stays are unfolded and the distance measuring components are stored in the receiving groove);

[0029] Figure 6 for Figure 5 The schematic diagram of the main cross-sectional structure of the whole in the further installation state during installation (the stays are unfolded and the distance measuring components are stored in the receiving groove);

[0030] Figure 7 for Figure 6 The enlarged structural diagram at A in the middle;

[0031] Figure 8 for Figure 2 A structural schematic diagram of the distribution state of the first groove and the second groove after the first cylinder is unfolded;

[0032] Fig. 9 for Figure 2 A structural schematic diagram of the distribution state of the third groove and the fourth groove after the second cylinder is unfolded;

[0033] Fig.10 for Figure 2 Schematic diagram of the enlarged structure at point B.

[0034] Description of main symbols:

[0035] 1. Cylinder; 2. Monitoring rock mass; 3. Strut; 4. Distance measuring assembly; 5. Adjustment rod; 6. First cylinder; 7. First groove; 8. Second groove; 9. First protrusion; 10. First ring; 11. Second ring; 12. First limiting groove; 13. Second limiting groove; 14. Limit rod; 15. Limit sleeve; 16. Third limiting groove; 17. First connecting rod; 19. Second cylinder; 20. Third groove; 21. Fourth groove; 22. Second protrusion; 23. Second connecting rod; 24. First bevel gear; 25. Third cylinder; 26. Second bevel gear; 27. Third connecting rod; 28. Accommodation groove; 29. ​​Mounting plate; 30. Telescopic rod. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0037] Please combine Figures 1 to 10 , a monitoring and early warning device for overburden movement and surrounding rock damage caused by mining, comprising a cylinder 1 inserted into the inner side of a monitoring rock mass 2, two opposing struts 3 being rotatably arranged on the outer wall of the cylinder 1, a distance measuring component 4 being installed on the cylinder 1, an adjusting rod 5 being axially inserted into the bottom of the cylinder 1, an action mechanism being arranged inside the cylinder 1, and the action mechanism being driven by the axial movement of the adjusting rod 5 toward the inside of the cylinder 1, and being able to first guide the bottom of the strut 3 to be centrifugally deflected outwards to abut against the inner wall of the monitoring rock mass 2, and then guiding the initial distance measurement of the adjustment distance measuring component;

[0038] Among them, the monitoring and early warning device for overburden movement and surrounding rock damage caused by mining also includes data processing equipment and alarm equipment. The ranging component is used to monitor the deformation generated in the monitoring rock mass 2 at all times, and the data processing equipment is used to determine whether the deformation in the monitoring rock mass 2 is greater than a predetermined threshold. If it is greater, the alarm device is controlled to send an alarm signal.

[0039] The action mechanism includes a first cylinder 6 concentrically arranged inside the cylinder 1, and the bottom of the first cylinder 6 is sleeved on the top of the adjusting rod 5.

[0040] The first cylinder 6 has a first transmission assembly therein. The first transmission assembly is driven by the adjusting rod 5 to extend axially relative to the first cylinder 6 and move, and can guide the first cylinder 6 to rotate in one direction.

[0041] A second transmission assembly is arranged in the cylinder 1, and the second transmission assembly is driven by the unidirectional rotation of the first cylinder 6, and can guide the bottom of the strut 3 to deflect centrifugally outward;

[0042] A third transmission assembly is arranged in the cylinder 1 , and the third transmission assembly is driven by the axial movement of the adjusting rod 5 , so as to adjust the initial distance between the distance measuring assembly and the inner side of the monitoring rock mass 2 .

[0043] The first transmission assembly includes a first protrusion 9 fixed on the outer wall of the adjusting rod 5 , and an inner wall of the first cylinder 6 is provided with a first spiral groove 7 , in which the first protrusion 9 is slidably engaged.

[0044] The second transmission assembly includes a first ring body 10 sleeved and fixed on the outside of the adjusting rod 5, a second ring body 11 sleeved and fixed on the outside of the first cylinder 6, two radially extending first limit grooves 12 are relatively provided on the annular surface of the first ring body 10, and two centripetally curved and extending second limit grooves 13 are relatively provided on the annular surface of the second ring body 11, a limit rod 14 parallel to the adjusting rod 5 is slidably provided in the first limit groove 12, a limit sleeve 15 parallel to the adjusting rod 5 is slidably provided in the second limit groove 13, and the top of the limit rod 14 is slidably inserted in the bottom of the limit sleeve 15; a first connecting rod 17 is radially provided on the outer wall of the limit sleeve 15 away from the adjusting rod 5, and one end of the first connecting rod 17 is pin-connected to the outer wall of the support bar 3.

[0045] The third transmission assembly includes a second cylinder 19 rotatably inserted inside the cylinder 1, the bottom of the second cylinder 19 is sleeved on the top of the first cylinder 6, the inner wall of the first cylinder 6 is axially provided with a second groove 8 which is slidably engaged with the first protrusion 9, the bottom of the second groove 8 is connected to the top of the first groove 7,

[0046] A fourth transmission assembly is arranged inside the cylinder 1 . The fourth transmission assembly is driven by the unidirectional rotation of the second cylinder 19 and can adjust the initial distance between the distance measuring assembly and the inner side of the monitored rock mass 2 .

[0047] The fourth transmission assembly includes a second protrusion 22 arranged on the outer wall of the first cylinder 6, and the inner wall of the second cylinder 19 is respectively provided with a third groove 20 extending circumferentially and a fourth groove 21 in the axial direction and in the shape of a spiral line from bottom to top. The third groove 20 is connected to the fourth groove 21, and the third groove 20 and the fourth groove 21 are both slidably engaged with the second protrusion 22. The top of the first cylinder 6 is elastically connected to the inner wall of the second cylinder 19, and a second connecting rod 23 is concentrically fixed to the top of the second cylinder 19. The top of the second connecting rod 23 is A first bevel gear 24 is provided, and a third cylinder 25 is radially rotatably inserted inside the cylinder 1. A second bevel gear 26 matching the first bevel gear 24 is sleeved and fixed on the outer side of the third cylinder 25. A third connecting rod 27 is threadedly inserted at both ends of the third cylinder 25. A receiving groove 28 for accommodating the distance measuring component 4 is opened on the outer wall of the cylinder 1. A mounting plate 29 is provided in the receiving groove 28. One end of the third connecting rod 27 is connected to one side of the mounting plate 29. The distance measuring component 4 is arranged on the other side of the mounting plate 29. A telescopic rod 30 is arranged between the mounting plate 29 and the receiving groove 28.

[0048] A spring is arranged between the top of the first cylinder 6 and the inner wall of the second cylinder 19. When the first cylinder 6 axially extends into the second cylinder 19, the spring is compressed and deformed.

[0049] A third limiting groove 16 is axially formed on the outer wall of the limiting sleeve 15 , and the first connecting rod 17 is slidably and clamped in the third limiting groove 16 toward the centripetal end.

[0050] When the first protrusion 9 is located at the bottom of the first groove 7, the second protrusion 22 is located at one end of the third groove 20, and the first connecting rod 17 is located at the top of the third limiting groove 16;

[0051] When the first protrusion 9 is located at the top of the first groove 7, the second protrusion 22 is located at the other end of the third groove 20, and the first connecting rod 17 is located at the top of the third limiting groove 16;

[0052] When the first protrusion 9 is located at the top of the second groove 8, the second protrusion 22 is located at the other end of the third groove 20, the first connecting rod 17 is located at the top of the third limiting groove 16, and the limiting rod 14 is completely inserted into the limiting sleeve 15.

[0053] When the second protrusion 22 is located at the top of the fourth groove 21 , the first connecting rod 17 is located at the bottom of the third limiting groove 16 .

[0054] The distance measuring component is a laser distance meter.

[0055] The working principle of this embodiment:

[0056] During installation, the cylinder 1 is first inserted into the monitoring hole preset on the monitoring rock mass 2, and then the adjusting rod 5 is pushed toward the inner axis of the bottom of the cylinder 1 (the first ring body 10 moves synchronously with the adjusting rod 5, so that the limiting rod 14 gradually extends into the limiting sleeve 15). This will first cause the adjusting rod 5 to continuously rub and squeeze the axially spiral first groove 7 wall through the first protrusion 9, forcing the first cylinder 6 to rotate unidirectionally, and the first cylinder 6 can drive the second ring body 11 to rotate synchronously, so that the groove wall of the second limiting groove 13 rubs and squeezes the limiting sleeve 15, and under the joint limiting action of the limiting rod 14 and the first limiting groove 12, the limiting sleeve 15 and the limiting rod 14 are synchronously centrifugally moved, and the limiting sleeve 15 pushes the support bar 3 to deflect centrifugally outward through the first connecting rod 17, so that the bottom of the support bar 3 is abutted and fixed with the hole wall of the monitoring hole, thereby realizing the installation and fixation of the device on the monitoring rock mass 2.

[0057] After installation and fixation, the position of the second protrusion 22 in the third groove 20 is changed to: the end of the third groove 20 that is connected to the fourth groove 21 (i.e., the bottom of the fourth groove 21), and then the adjusting rod 5 continues to be pushed axially inwardly at the bottom of the cylinder 1. When the limiting rod 14 is fully inserted into the limiting sleeve 15, the first protrusion 9 moves to the top of the second groove 8 (and then the continued axial upward movement of the adjusting rod 5 can drive the first cylinder 6 to move upward synchronously). Then, the adjusting rod 5 is continuously pushed toward the inner axial direction of the bottom of the cylinder 1, which causes the top of the first cylinder 6 to move axially toward the inside of the second cylinder 19 (spring compression), so that the second protrusion 22 rubs and squeezes the groove wall of the fourth groove 21 which is axially spiral, forcing the second cylinder 19 to rotate unidirectionally. The second cylinder 19 drives the first bevel gear 24, the second bevel gear 26, and the third cylinder 25 to rotate synchronously through the second connecting rod 23, so that both ends of the third cylinder 25 are threadedly interacted with the corresponding third connecting rod 27, and under the limiting action of the telescopic rod 30, the mounting plate 29 can be moved centrifugally outward to adjust the distance measuring assembly 4 to the corresponding initial distance.

[0058] During monitoring, the distance measuring component 4 constantly monitors the deformation generated in the monitoring rock mass 2, and the data processing device determines whether the deformation in the monitoring rock mass 2 is greater than a predetermined threshold value. If it is greater, the alarm device is controlled to send an alarm signal. The alarm device can be a buzzer, and the alarm device is installed on the outside of the bottom of the cylinder 1.

[0059] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A monitoring and early warning device for overburden movement and surrounding rock damage caused by mining, characterized in that: It comprises a cylinder inserted inside the monitoring rock body, two opposing struts are rotatably arranged on the outer wall of the cylinder, a distance measuring assembly is installed on the cylinder, an adjusting rod is axially inserted at the bottom of the cylinder, an action mechanism is arranged inside the cylinder, and the action mechanism is driven by the axial movement of the adjusting rod toward the inside of the cylinder, and can first guide the bottom of the strut to deflect centrifugally outward to abut against the inner wall of the monitoring rock body, and then guide the initial distance measurement of the distance measuring assembly; Among them, the monitoring and early warning device for overburden movement and surrounding rock damage caused by mining also includes data processing equipment and alarm equipment. The ranging component is used to monitor the deformation generated in the monitoring rock body at all times, and the data processing equipment is used to determine whether the deformation in the monitoring rock body is greater than a predetermined threshold. If it is greater, the alarm equipment is controlled to send an alarm signal.

2. The mining-induced overburden movement and surrounding rock damage monitoring and early warning device according to claim 1, characterized in that: The action mechanism comprises a first cylinder body concentrically arranged inside the cylinder, the bottom of the first cylinder body is sleeved on the top of the adjusting rod, The first cylinder has a first transmission assembly, which is driven by the adjusting rod to extend and move axially relative to the first cylinder, and can guide the first cylinder to rotate in one direction. A second transmission assembly is arranged in the cylinder, and the second transmission assembly is driven by the unidirectional rotation of the first cylinder, and can guide the bottom of the strut to deflect centrifugally outward; A third transmission assembly is arranged in the cylinder, and the third transmission assembly is driven by the movement of the adjusting rod extending axially, and can adjust the initial distance between the distance measuring assembly and the inner side of the monitoring rock body.

3. The mining-induced overburden movement and surrounding rock damage monitoring and early warning device according to claim 2, characterized in that: The first transmission assembly includes a first protrusion fixed on the outer wall of the adjustment rod, and the inner wall of the first cylinder is provided with a first spiral groove, and the first protrusion is slidably engaged in the first groove.

4. The mining-induced overburden movement and surrounding rock damage monitoring and early warning device according to claim 3, characterized in that: The second transmission assembly includes a first ring body that is sleeved and fixed on the outside of the adjusting rod, a second ring body that is sleeved and fixed on the outside of the first cylinder, two radially extending first limit grooves are relatively formed on the annular surface of the first ring body, and two centripetally curved second limit grooves are relatively formed on the annular surface of the second ring body, a limit rod parallel to the adjusting rod is slidably provided in the first limit groove, a limit sleeve parallel to the adjusting rod is slidably provided in the second limit groove, and the top of the limit rod is slidably inserted in the bottom of the limit sleeve; a first connecting rod is radially arranged on the outer wall of the limit sleeve away from the adjusting rod, and one end of the first connecting rod is pinned to the outer wall of the support bar.

5. The mining-induced overburden movement and surrounding rock damage monitoring and early warning device according to claim 3, characterized in that: The third transmission assembly includes a second cylinder body rotatably inserted inside the cylinder, the bottom of the second cylinder body is sleeved on the top of the first cylinder body, the inner wall of the first cylinder body is axially provided with a second groove which is slidably engaged with the first protrusion, and the bottom of the second groove is connected to the top of the first groove. A fourth transmission assembly is arranged inside the cylinder, and the fourth transmission assembly is driven by the unidirectional rotation of the second cylinder body, and can adjust the initial distance between the distance measuring assembly and the inner side of the monitoring rock body.

6. The mining-induced overburden movement and surrounding rock damage monitoring and early warning device according to claim 5, characterized in that: The fourth transmission assembly includes a second protrusion arranged on the outer wall of the first cylinder, the inner wall of the second cylinder is respectively provided with a third groove extending circumferentially and a fourth groove in the axial direction being spirally shaped from bottom to top, the third groove is connected to the fourth groove, and the third groove and the fourth groove are both slidably engaged with the second protrusion, an elastic connection is arranged between the top of the first cylinder and the inner wall of the second cylinder, a second connecting rod is concentrically fixed on the top of the second cylinder, a first bevel tooth is arranged on the top of the second connecting rod, a third cylinder is radially rotatably inserted inside the cylinder, a second bevel tooth matching with the first bevel tooth is sleeved and fixed on the outer side of the third cylinder, a third connecting rod is threadedly inserted at both ends of the third cylinder, a receiving groove for accommodating a distance measuring assembly is arranged on the outer wall of the cylinder, a mounting plate is arranged in the receiving groove, one end of the third connecting rod is connected to one side of the mounting plate, the distance measuring assembly is arranged on the other side of the mounting plate, and a telescopic rod is arranged between the mounting plate and the receiving groove.

7. The mining-induced overburden movement and surrounding rock damage monitoring and early warning device according to claim 6, characterized in that: A spring is arranged between the top of the first cylinder and the inner wall of the second cylinder. When the first cylinder axially extends into the second cylinder, the spring is compressed and deformed.

8. The monitoring and early warning device for overburden movement and surrounding rock damage caused by mining as claimed in claim 7 is characterized in that: A third limiting groove is axially formed on the outer wall of the limiting sleeve, and the centripetal end of the first connecting rod is slidably clamped in the third limiting groove.

9. The mining-induced overburden movement and surrounding rock damage monitoring and early warning device according to claim 8, characterized in that: When the first protrusion is located at the bottom of the first groove, the second protrusion is located at one end of the third groove, and the first connecting rod is located at the top of the third limiting groove; When the first protrusion is located at the top of the first groove, the second protrusion is located at the other end of the third groove, and the first connecting rod is located at the top of the third limiting groove; When the first protrusion is located at the top of the second groove, the second protrusion is located at the other end of the third groove, the first connecting rod is located at the top of the third limiting groove, and the limiting rod is completely inserted into the limiting sleeve. When the second protrusion is located at the top of the fourth groove, the first connecting rod is located at the bottom of the third limiting groove.

10. The mining-induced overburden movement and surrounding rock damage monitoring and early warning device according to claim 1, characterized in that: The distance measuring component is a laser distance meter.

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