Coal mine rock burst monitoring and early warning device

Abstract

The invention belongs to the technical field of coal mine safety monitoring, and provides a coal mine rock burst monitoring and early warning device which comprises a first mounting disc and a second mounting disc which are arranged up and down, a vertical lead screw is arranged between the first mounting disc and the second mounting disc, and a ball nut matched with the lead screw is arranged in the first mounting disc. A first adjusting rod and a second adjusting rod which are rotationally connected are arranged on the opposite faces of the first mounting disc and the second mounting disc correspondingly, and the end of the first adjusting rod is slidably connected into the second adjusting rod; the device further comprises assembling buffer assemblies, the assembling buffer assemblies are distributed on the outer side wall of the second adjusting rod at intervals, and the foremost ends of the assembling buffer assemblies are provided with grating three-dimensional stress sensors externally connected with a power source. By changing the coal mine rock burst monitoring equipment, the coal mine rock burst monitoring device can be suitable for monitoring a mine hole or a coal mine at the top of a roadway, the monitoring accuracy is improved, and the flexibility of the device is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine safety monitoring, and specifically relates to a monitoring and early warning device for coal mine rock bursts. Background Art

[0002] Rock burst, also known as rockburst, refers to the sudden and violent release of the deformation potential energy of coal mines and rock masses under certain conditions during coal mining. This release will cause the rock mass to suddenly burst, collapse or be thrown out, which has great destructiveness and is one of the main safety hazards faced by deep shaft mines.

[0003] The main characteristics of rock bursts are suddenness: there are generally no obvious precursors before the occurrence. Quite a number of rock bursts are caused by blasting, roof extrusion, etc., but many also occur during periods without human activities; destructiveness: often causing coal wall spalling, roof subsidence, floor heave, support damage, roadway blockage, casualties, etc.

[0004] Therefore, in order to ensure the safe production of coal mines, a series of prevention and control measures need to be taken to reduce the risk of rock bursts. By installing and maintaining ground pressure monitoring equipment, the changes and trends of coal mine rock bursts are monitored in real time, and corresponding early warning and protection measures are taken in a timely manner according to the monitoring data. However, most of the existing equipment for monitoring coal mine ground pressure is fixed in a certain position and cannot be flexibly changed, reducing the flexibility of the monitoring equipment. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a monitoring and early warning device for coal mine rock bursts to solve the problems such as insufficient flexibility in monitoring coal mine rock bursts in the prior art.

[0006] A monitoring and early warning device for coal mine rock bursts includes a first mounting plate and a second mounting plate arranged up and down. A vertical lead screw is provided between the first mounting plate and the second mounting plate. A ball nut that cooperates with the lead screw is provided inside the first mounting plate. A first adjusting rod and a second adjusting rod are respectively rotatably connected to the opposite surfaces of the first mounting plate and the second mounting plate. The end of the first adjusting rod is slidably connected inside the second adjusting rod.

[0007] It further includes an assembly buffer component, which is distributed at intervals on the outer side wall of the second adjusting rod. A grating three-dimensional stress sensor connected to an external power supply is provided at the front end of the assembly buffer component. An explosion-proof protection component is provided outside the first mounting plate, and the explosion-proof protection component is used to cover the grating three-dimensional stress sensor.

[0008] Preferably, the number of the first adjusting rods and the second adjusting rods is not less than two, and the first adjusting rods and the second adjusting rods are annularly distributed on the first mounting plate and the second mounting plate. A locking ring is fixedly connected to the outer walls of the first mounting plate and the second mounting plate. Fastening studs for fixing in the rock are provided on the locking ring, and the cross-sectional profile of the locking ring on the outer wall of the first mounting plate is stepped.

[0009] Preferably, the number of the grating three-dimensional stress sensors on one of the second adjusting rods is more than two. A sliding groove with a cross-sectional profile of a cross shape is provided inside the second adjusting rod. A sliding rod is rotatably connected to the head of the first adjusting rod. Both ends of the sliding rod are movably located in the sliding groove. A motor one connected to an external power source is provided on the outer wall of the first mounting plate away from the first adjusting rod.

[0010] Preferably, the assembly buffer component includes a mounting plate, a mounting ball, a movable ball, a positioning rod and a movable column. The mounting plates are spaced apart on the outer side wall of the second adjusting rod, and the number of the mounting plates is the same as that of the grating three-dimensional stress sensors. Locking screws are provided near the four corners of the mounting plate. The locking screws pass through the mounting plate and are locked in the second adjusting rod. The mounting ball is fixedly connected to the mounting plate.

[0011] Preferably, a clamping hole is provided inside the mounting ball. The movable ball is located in the clamping hole. The movable ball is movably embedded in the mounting ball and can rotate inside the mounting ball. The positioning rod is fixedly connected to the outer wall of the movable ball. The center line of the positioning rod and the center line of the movable ball are on the same straight line.

[0012] Preferably, the inside of the movable column is hollow, and the other end of the positioning rod extends into the movable column. The grating three-dimensional stress sensor is fixedly connected to the end of the movable column away from the positioning rod. A protection spring is provided inside the movable column. One end of the protection spring abuts against the grating three-dimensional stress sensor, and the other end abuts against the positioning rod.

[0013] Preferably, a placing ring is provided on the outside of the first mounting plate. The placing ring is lapped on the stepped portion of the locking ring and cooperates with it. A bearing plate is provided on the side of the placing ring away from the first mounting plate. A connecting plate is provided between the bearing plate and the placing ring. Annularly distributed support rods are provided on the top of the placing ring. The support rods and the connecting plate are staggered. A support plate is fixedly connected to the top of the support rods.

[0014] Preferably, the explosion-proof protection component includes an explosion-proof cylinder, a sliding plate, a pull rope, a rope post and a card hole. The inside of the explosion-proof cylinder opens downward to cover the first adjusting rod and the second adjusting rod, and the height of the explosion-proof cylinder is greater than the vertical height of the first adjusting rod and the second adjusting rod. Buffer layers are provided on the top of the support plate and the inner top wall of the explosion-proof cylinder at opposite positions. A protection groove is provided on the outer wall of the explosion-proof cylinder, and the position of the protection groove is within the same vertical height of the grating three-dimensional stress sensor. The size of the protection groove is larger than that of the grating three-dimensional stress sensor.

[0015] Preferably, the card holes are symmetrically opened on the explosion-proof cylinder. Loading grooves are symmetrically provided on the top of the loading plate. The sliding plates are symmetrically distributed in the loading grooves and are slidably connected. The positions of the sliding plates and the card holes are opposite and the sliding plates can extend into the card holes. The rope post is rotatably connected to the center of the loading plate.

[0016] Preferably, the number of the pull ropes is two. One end of each pull rope is wound around the rope post, and the other end is fixedly connected to the sliding plate. A second motor connected to an external power supply is provided at the bottom of the loading plate, and the output shaft of the second motor is connected to the rope post.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. By providing the first mounting plate and the second mounting plate, a lead screw is arranged between the first mounting plate and the second mounting plate, and a ball nut is arranged on the lead screw. In the initial state, the first adjusting rod and the second adjusting rod are in an inclined state, and the grating three-dimensional stress sensors are vertically distributed on the second adjusting rod. Thus, the monitoring device can be placed in the mine tunnel, and the grating three-dimensional stress sensors can be attached to the inner wall of the mine tunnel to monitor the rock layer inside the coal mine.

[0019] Move the ball nut to make the first adjusting rod slide inside the second adjusting rod, thereby driving the second adjusting rod to gradually become horizontal, and invert the first mounting plate and the second mounting plate. Thus, the grating three-dimensional stress sensors gradually tend to be horizontal. By installing the monitoring device on the top of the roadway, the grating three-dimensional stress sensors can be attached to the top of the roadway, and the grating three-dimensional stress sensors spread around, thereby realizing the deformation of the monitoring device, which can be applicable to the coal mine monitoring environments of different occasions, and thus improving the flexibility of the monitoring and warning device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the overall monitoring and warning component of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the first state of components such as the first adjusting rod and the second adjusting rod of the present invention;

[0022] Figure 3 Schematic diagram of the state two structure of components such as the first adjusting rod and the second adjusting rod of the present invention;

[0023] Figure 4 Schematic diagram of the structure of components such as the first mounting plate, the second mounting plate and the lead screw of the present invention;

[0024] Figure 5 Schematic diagram of the structure of components of the grating three-dimensional stress sensor and the assembly buffer component of the present invention;

[0025] Figure 6 Schematic diagram of the internal components of the explosion-proof cylinder of the present invention;

[0026] Figure 7 Schematic diagram of the structure of components such as the bearing plate and the sliding plate of the present invention;

[0027] In the figure:

[0028] 1. First mounting plate; 2. Second mounting plate; 3. Lead screw; 4. Ball nut; 5. First adjusting rod; 6. Second adjusting rod; 7. Grating three-dimensional stress sensor; 8. Locking ring; 9. Fastening stud; 10. Sliding groove; 11. First motor; 12. Mounting plate; 13. Mounting ball; 14. Movable ball; 15. Positioning rod; 16. Movable column; 17. Locking screw; 18. Protection spring; 19. Placing ring; 20. Bearing plate; 21. Connecting plate; 22. Support rod; 23. Support plate; 24. Explosion-proof cylinder; 25. Sliding plate; 26. Pulling rope; 27. Rope post; 28. Card hole; 29. Buffer layer; 30. Protection groove; 31. Bearing groove; 32. Second motor; 33. Sliding rod. Specific embodiments

[0029] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0030] As shown in Figure 1 to Figure 7 shown:

[0031] Embodiment 1: The present invention provides a monitoring and early warning device for coal mine rock burst, including a first mounting plate 1 and a second mounting plate 2 arranged up and down. A vertical lead screw 3 is provided between the first mounting plate 1 and the second mounting plate 2. A ball nut 4 that cooperates with the lead screw 3 is provided inside the first mounting plate 1. The opposite surfaces of the first mounting plate 1 and the mounting plate are respectively provided with a rotatably connected first adjusting rod 5 and a second adjusting rod 6. The end of the first adjusting rod 5 is slidably connected inside the second adjusting rod 6;

[0032] It also includes an assembly buffer component, which is spaced apart and distributed on the outer wall of the second adjusting rod 6. A grating three-dimensional stress sensor 7 connected to an external power supply is provided at the front end of the assembly buffer component. An explosion-proof protection component is provided outside the first mounting plate 1, and the explosion-proof protection component is used to cover the grating three-dimensional stress sensor 7.

[0033] It should be noted that through the first mounting plate 1 and the second mounting plate 2 provided, a lead screw 3 is arranged between the first mounting plate 1 and the second mounting plate 2, and a ball nut 4 is arranged on the lead screw 3. In the initial state, the first adjusting rod 5 and the second adjusting rod 6 are in an inclined state, and the grating three-dimensional stress sensors 7 are vertically distributed on the second adjusting rod 6. Thus, the monitoring device can be placed in the mine tunnel, so that the grating three-dimensional stress sensors 7 are attached to the inner wall of the mine tunnel to monitor the rock layer inside the coal mine.

[0034] Move the ball nut 4 to make the first adjusting rod 5 slide inside the second adjusting rod 6, thereby driving the second adjusting rod 6 to gradually become horizontal, and invert the first mounting plate 1 and the second mounting plate 2, so that the grating three-dimensional stress sensors 7 gradually tend to be horizontal. By installing the monitoring device on the top of the roadway, the grating three-dimensional stress sensors 7 can be attached to the top of the roadway, and the grating three-dimensional stress sensors 7 spread out in all directions, so as to realize the deformation of the monitoring device, which can be applied to the coal mine monitoring environments of different occasions, thereby improving the flexibility of the monitoring and warning device.

[0035] In this embodiment, the number of the first adjusting rods 5 and the second adjusting rods 6 is not less than two, and the first adjusting rods 5 and the second adjusting rods 6 are annularly distributed on the first mounting plate 1 and the second mounting plate 2. Locking rings 8 are fixedly connected to the outer walls of the first mounting plate 1 and the second mounting plate 2. Fastening studs 9 for fixing in the rock are provided on the locking rings 8, and the cross-sectional contour of the locking ring 8 on the outer wall of the first mounting plate 1 is stepped.

[0036] It should be noted that the number of the first adjusting rods 5 and the second adjusting rods 6 is set to be not less than two and shows an annular distribution, so that the grating three-dimensional stress sensors 7 are annularly distributed, which can monitor and give early warnings at multiple points and improve the accuracy of coal mine rock detection.

[0037] Through the provided locking rings 8 and fastening studs 9, after the monitoring device is located in the mine tunnel, the first mounting plate 1 is locked to the top of the mine tunnel through the fastening studs 9. When monitoring the top of the roadway, the second mounting plate 2 is locked to the top through the fastening studs 9. Thus, the fixed installation of the monitoring device can be realized, ensuring the stability of the monitoring and warning device and realizing the normal monitoring of the rock mass and the coal mine.

[0038] In this embodiment, the number of grating three-dimensional stress sensors 7 on an adjusting rod II 6 is greater than two. A sliding groove 10 with a cross-shaped vertical section profile is provided inside the adjusting rod II 6. A sliding rod 33 is rotatably connected to the head of the adjusting rod I 5, and both ends of the sliding rod 33 are movably located inside the sliding groove 10. An electric motor I 11 connected to an external power supply is provided on the outer wall of the mounting plate I 1 away from the adjusting rod I 5.

[0039] It should be noted that by arranging a plurality of grating three-dimensional stress sensors 7 on the adjusting rod II 6, multi-point monitoring can be carried out, improving the accuracy of monitoring coal mines and rock masses. The provided sliding groove 10 enables the adjusting rod I 5 to slide inside the adjusting rod II 6, thereby controlling the angle between the adjusting rod I 5 and the adjusting rod II 6.

[0040] In this embodiment, the assembly buffer component includes a mounting plate 12, a mounting ball 13, a movable ball 14, a positioning rod 15 and a movable column 16. The mounting plates 12 are spaced apart on the outer side wall of the adjusting rod II 6, and the number of mounting plates 12 is the same as that of the grating three-dimensional stress sensors 7. Locking screws 17 are provided near the four corners of the mounting plate 12, and the locking screws 17 pass through the mounting plate 12 and are locked inside the adjusting rod II 6. The mounting ball 13 is fixedly connected to the mounting plate 12.

[0041] It should be noted that by providing the mounting plate 12 and the locking screws 17, the grating three-dimensional stress sensors 7 can be fixed on the adjusting rod II 6, enabling their quick disassembly and rapid replacement in case of damage, thus improving efficiency.

[0042] In this embodiment, the mounting ball 13 has a card hole 28 inside. The movable ball 14 is located inside the card hole 28. The movable ball 14 is movably embedded in the mounting ball 13 and can rotate inside the mounting ball 13. The positioning rod 15 is fixedly connected to the outer wall of the movable ball 14, and the center line of the positioning rod 15 and the center line of the movable ball 14 are on the same straight line.

[0043] It should be noted that by movably embedding the movable ball 14 into the mounting ball 13, the movable ball 14 can rotate inside the mounting ball 13, thereby enabling the adjustment of the angle of the grating three-dimensional stress sensor 7. When located in a mine tunnel and encountering unevenness, the grating three-dimensional stress sensor 7 can change its direction through the movable ball 14, so as to better fit on the inner wall of the rock mass.

[0044] In this embodiment, the inside of the movable column 16 is hollow, and the other end of the positioning rod 15 extends into the movable column 16. The grating three-dimensional stress sensor 7 is fixedly connected to one end of the movable column 16 away from the positioning rod 15. A protection spring 18 is provided inside the movable column 16. One end of the protection spring 18 abuts against the grating three-dimensional stress sensor 7, and the other end abuts against the positioning rod 15.

[0045] It should be noted that by setting the protection spring 18, when encountering mine tunnels with different diameters, the position of the grating three-dimensional stress sensor 7 can be changed by controlling the angle between the first adjusting rod 5 and the second adjusting rod 6. The grating three-dimensional stress sensors 7 are arranged in multiple layers. Thus, after one layer touches the inner wall of the rock formation, the angle between the first adjusting rod 5 and the second adjusting rod 6 can be further changed. The grating three-dimensional stress sensor 7 that touches the inner wall of the rock formation will move inward under the protection of the protection spring 18, enabling the grating three-dimensional stress sensors 7 that have not touched the inner wall of the rock formation to come into contact with the inner wall of the rock formation. As a result, more grating three-dimensional stress sensors 7 can touch the inner wall of the rock formation, and at the same time, the grating three-dimensional stress sensors 7 are protected to avoid being damaged by extrusion.

[0046] In this embodiment, a placement ring 19 is provided on the outer side of the first mounting plate 1. The placement ring 19 is lapped at the step of the locking ring 8 and cooperates with it. A bearing plate 20 is provided on the side of the placement ring 19 away from the first mounting plate 1. A connecting plate 21 is provided between the bearing plate 20 and the placement ring 19. The top of the placement ring 19 is provided with a ring-shaped distributed support rod 22. The support rod 22 and the connecting plate 21 are staggered. The top of the support rod 22 is provided with a fixedly connected support plate 23.

[0047] It should be noted that by setting the placement ring 19, after the monitoring and warning device is located in the mine tunnel, the placement ring 19 can be directly lapped on the first mounting plate 1, so that the explosion-proof cylinder 24 can be covered above the monitoring and warning device, and the installation is convenient and flexible.

[0048] In this embodiment, the explosion-proof protection component includes an explosion-proof cylinder 24, a sliding plate 25, a pull rope 26, a rope post 27 and a card hole 28. The inside of the explosion-proof cylinder 24 opens downward to cover the first adjusting rod 5 and the second adjusting rod 6, and the height of the explosion-proof cylinder 24 is greater than the vertical height of the first adjusting rod 5 and the second adjusting rod 6. Buffer layers 29 are provided at opposite positions on the top of the support plate 23 and the inner top wall of the explosion-proof cylinder 24. A protection groove 30 is provided on the outer wall of the explosion-proof cylinder 24, and the position of the protection groove 30 is within the same vertical height as the grating three-dimensional stress sensor 7. The size of the protection groove 30 is larger than that of the grating three-dimensional stress sensor 7.

[0049] It should be noted that by setting the sliding plate 25, the sliding plate 25 is inserted into the card hole 28 in the initial position. When encountering impact ground pressure, the rope post 27 is rotated to drive the sliding plate 25 to move through the pull rope 26. After the sliding plate 25 disengages from the card hole 28, the explosion-proof cylinder 24 can be moved down into the mine tunnel, and the protection groove 30 on the explosion-proof cylinder 24 descends into the grating three-dimensional stress sensor 7, so as to protect the grating three-dimensional stress sensor 7 and avoid damaging the grating three-dimensional stress sensor 7.

[0050] In this embodiment, the card holes 28 are symmetrically formed in the explosion-proof cylinder 24. The top of the bearing plate 20 is symmetrically provided with bearing grooves 31. The sliding plates 25 are symmetrically distributed in the bearing grooves 31 and are slidably connected. The positions of the sliding plates 25 and the card holes 28 are opposite, and the sliding plates 25 can extend into the card holes 28. The rope post 27 is rotatably connected to the center of the bearing plate 20.

[0051] In this embodiment, the number of the pulling ropes 26 is two. One end of each pulling rope 26 is wound around the rope post 27, and the other end is fixedly connected to the sliding plate 25. A motor two 32 connected to an external power supply is provided at the bottom of the bearing plate 20. The output shaft of the motor two 32 is connected to the rope post 27.

[0052] For the usage method of the above embodiment, the grating three-dimensional stress sensor 7 adopted in the present invention can monitor three parameters of temperature - stress - vibration. The grating three-dimensional stress sensor 7 adopts a wireless transmission method. When it is attached to the rock wall, the monitored data is transmitted to the corresponding monitoring device through the wireless transmission method. When the monitored data exceeds the reasonable range, the monitoring device will give an alarm. Moreover, the motor one 11 and the motor two 32 in the present invention are externally connected to a controller and can be controlled remotely;

[0053] First, a mine tunnel is dug at a suitable position, and the monitoring and warning device can be installed in the mine tunnel. In the initial state, the distance between the first mounting plate 1 and the second mounting plate 2 is the largest, and the included angle between the first adjusting rod 5 and the second adjusting rod 6 is 170°. The first adjusting rod 5 and the second adjusting rod 6 are placed downward into the mine tunnel, and the second mounting plate 2 enters the mine tunnel. When the locking ring 8 outside the first mounting plate 1 fits against the top of the mine tunnel, the device is installed by driving the fastening screws into the rock body. The grating three-dimensional stress sensor 7 is connected to the second adjusting rod 6 through an assembly buffer component, and the grating three-dimensional stress sensors 7 are distributed in multiple layers on the second adjusting rod 6 at this time. Because the second adjusting rod 6 is vertically inclined, some of the grating three-dimensional stress sensors 7 do not contact the inner wall of the rock body;

[0054] At this time, the first motor 11 can be started to drive the lead screw 3 to rotate. The ball nut 4 cooperates with the lead screw 3 to drive the first mounting plate 1 to move downward. The second adjusting rod 6 slides in the sliding groove 10 in the first adjusting rod 5, reducing the angle between the first adjusting rod 5 and the second adjusting rod 6. At the same time, the second adjusting rod 6 will also rotate outward around the connection point with the second mounting plate 2, moving the grating three-dimensional stress sensor 7 outward to contact the inner wall of the rock mass. The lower-layer grating three-dimensional stress sensor 7 contacts the inner wall first, enabling the monitoring of the rock mass. When there are insufficient monitoring points, the second adjusting rod 6 continues to rotate outward. The lower-layer grating three-dimensional stress sensor 7 is connected to the movable column 16, and there is a protective spring 18 in the movable column 16, allowing the movable column 16 to slide on the positioning rod 15 and the grating three-dimensional stress sensor 7 to move inward. When the upper-layer grating three-dimensional stress sensor 7 contacts the inner wall of the rock mass, the number of monitoring points increases, and the first motor 11 stops, thus enabling the monitoring of the mine tunnel;

[0055] When abnormal data is detected, by starting the second motor 32. In the initial state, the explosion-proof cylinder 24 is installed above the mine tunnel, and the placement ring 19 is lapped on the locking ring 8. The second motor 32 drives the rope column 27 to rotate, winding the two pull ropes 26 tightly around the rope column 27, thereby pulling the sliding plate 25 to move in the bearing groove 31, causing the sliding plate 25 to gradually disengage from the card hole 28. When it is completely disengaged, the explosion-proof cylinder 24 will move downward, and the protection groove 30 will cover the grating three-dimensional stress sensor 7. The buffer layer 29 on the inner wall of the explosion-proof cylinder 24 fits with the buffer layer 29 on the bearing plate 20, stopping the movement, thus covering the monitoring and warning device to prevent it from being squeezed and causing damage to the grating three-dimensional stress sensor 7, achieving its protection.

[0056] When it is necessary to monitor the top of the coal mine roadway, the positions of the first mounting plate 1 and the second mounting plate 2 are swapped at this time. Since it is installed on the top of the roadway, the explosion-proof cylinder 24 is no longer installed. The first motor 11 is started to drive the ball nut 4 to move on the lead screw 3, gradually reducing the angle between the first adjusting rod 5 and the second adjusting rod 6. When the second mounting plate 2 moves to the appropriate position, the second adjusting rod 6 tends to be in a horizontal state. At this time, select an appropriate position and fit the locking member on the outer wall of the second mounting plate 2 to the top wall, and then lock it in the rock mass again through the fastening screws. At this time, the grating three-dimensional stress sensors 7 are distributed at intervals on the top of the second adjusting rod 6, making it fit on the top wall rock layer of the roadway. At this time, the grating three-dimensional stress sensors 7 are evenly distributed all around. Through the adjustment of the two methods, the coal mine rock burst in different scenarios can be monitored and warned, improving the flexibility of the monitoring and warning device.

[0057] Embodiments of the present invention are given for purposes of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A monitoring and early warning device for rock burst in coal mines, characterized in that: It includes a first mounting plate (1) and a second mounting plate (2) arranged vertically. A vertical lead screw (3) is provided between the first mounting plate (1) and the second mounting plate (2). A ball nut (4) that cooperates with the lead screw (3) is provided inside the first mounting plate (1). A first adjusting rod (5) and a second adjusting rod (6) that are rotatably connected are respectively provided on the opposite surfaces of the first mounting plate (1) and the second mounting plate (2). The end of the first adjusting rod (5) is slidably connected inside the second adjusting rod (6); It further includes an assembly buffer component. The assembly buffer components are distributed at intervals on the outer wall of the second adjusting rod (6). A grating three-dimensional stress sensor (7) connected to an external power supply is provided at the front end of the assembly buffer component. An explosion-proof protection component is provided outside the first mounting plate (1). The explosion-proof protection component is used to cover the grating three-dimensional stress sensor (7).

2. The coal mine rock burst monitoring and early warning device according to claim 1, wherein: The number of the first adjusting rods (5) and the second adjusting rods (6) is not less than two, and the first adjusting rods (5) and the second adjusting rods (6) are annularly distributed on the first mounting plate (1) and the second mounting plate (2). A locking ring (8) fixedly connected is provided on the outer walls of the first mounting plate (1) and the second mounting plate (2). A fastening stud (9) for fixing in the rock is provided on the locking ring (8), and the cross-sectional profile of the locking ring (8) on the outer wall of the first mounting plate (1) is stepped.

3. The coal mine rock burst monitoring and early warning device according to claim 1, characterized in that: The number of the grating three-dimensional stress sensors (7) on one of the second adjusting rods (6) is more than two. A sliding groove (10) with a cross-sectional profile of a cross shape is provided inside the second adjusting rod (6). A sliding rod (33) that is rotatably connected is provided at the head of the first adjusting rod (5). Both ends of the sliding rod (33) are movably located inside the sliding groove (10). A first motor (11) connected to an external power supply is provided on the outer wall of the first mounting plate (1) away from the first adjusting rod (5). The first motor (11) is fixedly connected to the locking ring (9) near the outside of the first mounting plate (1). The locking ring (9) on the outer wall of the second mounting plate (2) is fixedly connected.

4. The coal mine rock burst monitoring and early warning device according to claim 1, characterized in that: The assembly buffer component includes a mounting plate (12), a mounting ball (13), a movable ball (14), a positioning rod (15) and a movable column (16). The mounting plates (12) are distributed at intervals on the outer wall of the second adjusting rod (6), and the number of the mounting plates (12) is the same as that of the grating three-dimensional stress sensors (7). Locking screws (17) are provided near the four corners of the mounting plate (12). The locking screws (17) pass through the mounting plate (12) and are locked inside the second adjusting rod (6). The mounting ball (13) is fixedly connected to the mounting plate (12).

5. The coal mine rock burst monitoring and early warning device according to claim 4, characterized in that: The interior of the mounting ball (13) has a clamping hole (28). The movable ball (14) is located within the clamping hole (28). The movable ball (14) is movably embedded within the mounting ball (13) and can rotate within the mounting ball (13). The positioning rod (15) is fixedly connected to the outer wall of the movable ball (14). The center line of the positioning rod (15) is on the same straight line as the center line of the movable ball (14).

6. The coal mine rock burst monitoring and early warning device according to claim 5, characterized in that: The interior of the movable column (16) is hollow, and the other end of the positioning rod (15) extends into the movable column (16). The grating three-dimensional stress sensor (7) is fixedly connected to one end of the movable column (16) away from the positioning rod (15). A protective spring (18) is provided inside the movable column (16). One end of the protective spring (18) abuts against the grating three-dimensional stress sensor (7), and the other end abuts against the positioning rod (15).

7. The coal mine rock burst monitoring and early warning device according to claim 2, characterized in that: A placement ring (19) is provided on the outside of the first mounting disc (1). The placement ring (19) overlaps and cooperates with the step of the locking ring (8). A bearing plate (20) is provided on the side of the placement ring (19) away from the first mounting disc (1). A connecting plate (21) is provided between the bearing plate (20) and the placement ring (19). The top of the placement ring (19) is provided with a ring-shaped distribution of support rods (22). The support rods (22) and the connecting plate (21) are staggered. The top of the support rod (22) is provided with a fixedly connected support plate (23).

8. The coal mine rock burst monitoring and early warning device according to claim 7, characterized in that: The explosion-proof protection assembly includes an explosion-proof cylinder (24), a sliding plate (25), a pull rope (26), a rope post (27), and a clamping hole (28). The interior of the explosion-proof cylinder (24) opens downward to cover the first adjusting rod (5) and the second adjusting rod (6). The height of the explosion-proof cylinder (24) is greater than the vertical height of the first adjusting rod (5) and the second adjusting rod (6). Buffer layers (29) are provided at opposite positions on the top of the support plate (23) and the inner top wall of the explosion-proof cylinder (24). A protection groove (30) is provided on the outer wall of the explosion-proof cylinder (24), and the position of the protection groove (30) is within the same vertical height as the grating three-dimensional stress sensor (7). The size of the protection groove (30) is larger than that of the grating three-dimensional stress sensor (7).

9. The coal mine rock burst monitoring and early warning device according to claim 8, characterized in that: The clamping holes (28) are symmetrically opened on the explosion-proof cylinder (24). Bearing grooves (31) are symmetrically provided on the top of the bearing plate (20). The sliding plates (25) are symmetrically distributed within the bearing grooves (31) and are slidably connected. The sliding plates (25) are opposite to the clamping holes (28) in position and can extend into the clamping holes (28). The rope post (27) is rotatably connected to the central position of the bearing plate (20).

10. The coal mine rock burst monitoring and early warning device according to claim 9, characterized in that: The number of the draw ropes (26) is two. One end of each draw rope (26) is wound around the rope post (27), and the other end is fixedly connected to the sliding plate (25). A second motor (32) connected to an external power supply is provided at the bottom of the bearing plate (20), and an output shaft of the second motor (32) is connected to the rope post (27).

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