Ground subsidence monitoring device for coal mine goaf
By designing a coal mine goaf ground settlement monitoring device including a pressure-proof plate, the problem of vulnerability to existing devices is solved, and more accurate detection data and the effect of reducing maintenance costs is achieved.
Patent Information
- Application Number
- CN202421808669.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-30
AI Technical Summary
The existing coal mine goaf ground settlement monitoring device is easily damaged during use, resulting in inaccurate detection data and increased maintenance costs.
A coal mine goaf ground settlement monitoring device including a fixed shaft disk, a positioning sensor, a remote sensing receiver, a placement tube, a displacement detection rod, a positioning block and a pressure-proof plate is designed. The anti-pressure plate is located outside the placement tube and is in the shape of an isosceles trapezoid, protecting the positioning sensor and fixed shaft plate to prevent pedaling and mechanical collisions.
Through the protection of the anti-pressure plate, the risk of damage to the device during use is reduced, the accuracy of the detection data is ensured, and the maintenance cost is reduced. At the same time, the design of the anti-pressure plate allows the device to be placed stably on uneven ground, improving the practicality and stability of monitoring.
Smart Images
Figure CN222882000U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ground subsidence monitoring, in particular to a ground subsidence monitoring device for a coal mine goaf area. Background Art
[0002] The ground subsidence monitoring device is a device for real-time monitoring of ground subsidence. It can be used in coal mine goafs to accurately measure and record ground subsidence data, providing important support for coal mine production safety, environmental protection and geological disaster prevention.
[0003] When the coal mine goaf area ground subsidence monitoring device in the prior art is in use, due to the relatively narrow coal mine, the positioning sensor of the coal mine goaf area ground subsidence monitoring device is located on the ground surface and is small, and the light in the coal mine is relatively dim, the coal mine goaf area ground subsidence monitoring device is easily stepped on by workers or collided or crushed by large machinery when placed, thereby making some parts of the coal mine goaf area ground subsidence monitoring device located on the ground surface easy to be damaged when in use. When the coal mine goaf area ground subsidence monitoring device is damaged, it will not only lead to inaccurate detection data, but also increase the maintenance cost of the coal mine goaf area ground subsidence monitoring device.
[0004] In view of the above technical problems, this application proposes a solution. Utility Model Content
[0005] The purpose of the utility model is to solve the shortcomings of the prior art of the ground subsidence monitoring device for the goaf of coal mines, which is that the coal mine is relatively narrow, the positioning sensor of the ground subsidence monitoring device for the goaf of coal mines is located on the ground surface and is small, and the light in the coal mine is relatively dim, so that the ground subsidence monitoring device for the goaf of coal mines is easily stepped on by workers or collided or crushed by large machinery when placed, so that some parts of the ground subsidence monitoring device for the goaf of coal mines are easily damaged when in use. When the ground subsidence monitoring device for the goaf of coal mines is damaged, not only the detection data will be inaccurate, but also the maintenance cost of the ground subsidence monitoring device for the goaf of coal mines is increased. Therefore, a ground subsidence monitoring device for the goaf of coal mines is proposed.
[0006] The purpose of the utility model can be achieved through the following technical solutions:
[0007] A ground subsidence monitoring device for coal mine goaf areas, comprising a fixed shaft disc; a positioning sensor is fixedly connected to the top of the outer wall of the fixed shaft disc; a remote sensing receiver is arranged above the fixed shaft disc; a placement tube is fixedly connected to the bottom end of the outer wall of the fixed shaft disc; a group of positioning blocks are arranged at the bottom end of the outer wall of the fixed shaft disc through a displacement detection rod; an anti-pressure plate is fixedly connected to the outer wall of the placement tube, and the anti-pressure plate is in the shape of an isosceles trapezoid and is hollow; the fixed shaft disc and the positioning sensor are both located inside the anti-pressure plate.
[0008] Preferably, the outer wall of the displacement detection rod is fixed with a group of fixed blocks, and a group of fixed blocks is staggered with a group of positioning blocks; the inner side walls of a group of positioning blocks are all slidably connected to the outer side wall of the displacement detection rod; the bottom ends of the outer walls of a group of fixed blocks are fixed with springs, and the bottom ends of the outer walls of a group of springs are respectively fixed to the top ends of the outer walls of a group of positioning blocks; the outer side wall of the placement tube is provided with a group of square through grooves, and the outer side walls of a group of positioning blocks are respectively in contact with the inner side walls of a group of square through grooves; the top end of the outer wall of the displacement detection rod is slidably connected to the bottom end of the outer wall of the fixed shaft disk; a fixing plate is fixed at the top end of the outer side wall of the displacement detection rod; a first threaded rod is rotatably connected to one side of the outer wall of the fixing plate, and one end of the outer wall of the first threaded rod passes through the placement tube, and the first threaded rod is threadedly connected to the placement tube; the first threaded rod is located in the anti-pressure plate.
[0009] Preferably, the bottom and top ends of the inner walls of the square through grooves are provided with arc grooves; the inner walls of a pair of the arc grooves are slidably connected with arc plates; and the outer walls of a pair of the arc plates are slidably connected to the outer walls of the positioning blocks on opposite sides.
[0010] Preferably, a group of threaded fixing rods are threadedly connected to the bottom end of the inner wall of the anti-pressure plate, and the bottom ends of the outer walls of the group of threaded fixing rods all penetrate the anti-pressure plate; a pair of sliding grooves are opened at the bottom end of the inner wall of the anti-pressure plate, and the pair of sliding grooves are respectively located on both sides of the fixed shaft disk; the inner side walls of a pair of the sliding grooves are slidably connected to support plates; the opposite sides of the inner wall of the anti-pressure plate are threadedly connected to second threaded rods through the first square plate, and the bottom ends of the outer walls of the pair of second threaded rods are respectively rotatably connected to the top ends of the outer walls of a pair of support plates.
[0011] Preferably, a displacement detection plate is fixedly connected to one side of the outer wall of the anti-pressure plate; a circular shell is slidably connected to one side of the outer wall of the displacement detection plate; and a threaded drill rod is threadedly connected to the inner wall of the circular shell.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] 1. The outer walls of a pair of arc plates are slidably connected to the outer wall of the positioning block on opposite sides, so that the up and down movement of the positioning block will drive the pair of arc plates to move up and down in the arc groove, so that when the positioning block is moving or not moving, it can cooperate with the pair of arc plates to block the square through groove, so that the rock and soil in the formation cannot enter the placement tube through the square through groove, so that the rock and soil in the formation cannot enter the placement tube to affect the detection of the displacement detection rod, so that the detection data of the displacement detection rod is more accurate, and the detection of the displacement detection rod is not prone to errors or mistakes, thereby ensuring the accuracy of the ground settlement data and making it difficult for the ground settlement data to have errors or errors that affect the judgment of the staff.
[0014] 2. By rotating the second threaded rod, since the second threaded rod is threadedly connected to the first square plate, the rotation of the second threaded rod drives the second threaded rod to move, and the movement of the second threaded rod drives the support plate to move, so that the support plate moves in the slide groove, so that when the device is placed in a place with an uneven ground, the pair of support plates on both sides of the fixed shaft disk can be adjusted so that the support plates cooperate with the anti-pressure plates to resist the ground, so that the device can be placed stably, so that the device can also be monitored at a position with an uneven ground, making the device more practical, and when the device is placed, the threaded fixing rod can be rotated to make the threaded fixing rod drill into the formation, so that the device is fixed, making the device more stable during monitoring, thereby further ensuring the accuracy of the monitoring data. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.
[0016] Figure 1 It is a schematic diagram of the main structure of the utility model;
[0017] Figure 2 It is a schematic diagram of the explosion structure of the anti-pressure plate, the threaded fixing rod and the support plate of the utility model;
[0018] Figure 3 It is a partial structural schematic diagram of the utility model;
[0019] Figure 4 It is a structural schematic diagram of the displacement detection rod, the positioning block, the arc plate and the fixing plate of the utility model;
[0020] Figure 5 It is a partial structural schematic diagram of the placement tube of the utility model;
[0021] In the figure: 1. fixed shaft disc; 2. positioning sensor; 3. placement tube; 4. displacement detection rod; 5. positioning block; 6. anti-pressure plate; 7. fixed block; 8. square through groove; 9. fixed plate; 10. first threaded rod; 11. arc groove; 12. arc plate; 13. threaded fixing rod; 14. slide groove; 15. support plate; 16. second threaded rod; 17. displacement detection plate; 18. round shell; 19. threaded drill rod. DETAILED DESCRIPTION
[0022] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] See also Figure 1-Figure 5 As shown, a ground subsidence monitoring device for coal mine goaf area comprises a fixed shaft disc 1; a positioning sensor 2 is fixedly connected to the top of the outer wall of the fixed shaft disc 1; a remote sensing receiver is arranged above the fixed shaft disc 1; a placement tube 3 is fixedly connected to the bottom end of the outer wall of the fixed shaft disc 1; a group of positioning blocks 5 are arranged at the bottom end of the outer wall of the fixed shaft disc 1 through a displacement detection rod 4; an anti-pressure plate 6 is fixedly connected to the outer wall of the placement tube 3, and the anti-pressure plate 6 is in the shape of an isosceles trapezoid, and the anti-pressure plate 6 is hollow; the fixed shaft disc 1 and the positioning sensor 2 are both located in the anti-pressure plate 6, by first drilling a reserved hole at the monitoring point, and then placing the device in the reserved hole at the monitoring point, at this time the remote sensing receiver is placed, at this time the fixed shaft disc 1 and the positioning sensor 2 are both located on the ground surface, the anti-pressure plate 6 is fixedly connected to the outer wall of the placement tube 3, and the fixed shaft disc 1 and The positioning sensors 2 are all located inside the anti-pressure plate 6, so that the fixed shaft disc 1 and the positioning sensors 2 are protected by the anti-pressure plate 6, so that when the staff steps on them or are crushed and collided by mechanical equipment, they are blocked by the anti-pressure plate 6, so that the fixed shaft disc 1 and the positioning sensor 2 are not easily damaged when placed, and through the shape and overall structure of the anti-pressure plate 6, the anti-pressure plate 6 not only contacts more area and has more force-bearing area, so that it is not easy to sink deeply into the ground, and because it is in the shape of an isosceles trapezoid, when the mechanical equipment encounters this device during transportation and it is not easy to bypass it, it can pass smoothly along the outer surface of the anti-pressure plate 6, so that the present device not only solves the problem that the fixed shaft disc 1 and the positioning sensor 2 are easily damaged when placed, but also makes it difficult to affect the transportation of other mechanical equipment and the walking of personnel when the present device is in use.
[0024] A group of fixing blocks 7 are fixedly connected to the outer wall of the displacement detection rod 4, and the group of fixing blocks 7 are staggered with a group of positioning blocks 5; the inner side walls of a group of positioning blocks 5 are slidably connected to the outer side wall of the displacement detection rod 4; the bottom ends of the outer walls of a group of fixing blocks 7 are fixedly connected to springs, and the bottom ends of the outer walls of a group of springs are respectively fixedly connected to the top ends of the outer walls of a group of positioning blocks 5; a group of square through grooves 8 are opened on the outer side wall of the placement tube 3, and the outer side walls of a group of positioning blocks 5 are respectively in contact with the inner side walls of a group of square through grooves 8; The top of the outer wall is slidably connected to the bottom end of the outer wall of the fixed shaft disk 1; a fixing plate 9 is fixedly connected to the top of the outer wall of the displacement detection rod 4; a first threaded rod 10 is rotatably connected to one side of the outer wall of the fixing plate 9, and one end of the outer wall of the first threaded rod 10 passes through the placement tube 3, and the first threaded rod 10 is threadedly connected to the placement tube 3; the first threaded rod 10 is located in the anti-pressure plate 6. When the device is used, the placement tube 3 is first placed in the reserved hole. After the placement tube 3 is placed, the first threaded rod 10 is rotated. Because the first threaded rod 10 and the placement tube 3 are The tube 3 is threadedly connected, so that the rotation of the first threaded rod 10 makes it move, and the movement of the first threaded rod 10 drives the fixed plate 9 to move, and the movement of the fixed plate 9 drives the displacement detection rod 4 to slide on the bottom end of the outer wall of the fixed shaft disk 1, and the movement of the displacement detection rod 4 will drive a group of fixed blocks 7 and positioning blocks 5 to move. At this time, the positioning block 5 will slowly move out of the square through groove 8, so that a part of the positioning block 5 moves to the corresponding stratum through the square through groove 8 on the placement tube 3. When the ground subsides, the positioning block 5 will slide in the square through groove 8 and on the displacement detection rod 4. At this time, the displacement detection rod 4 detects the displacement distance, and then the remote sensing receiver receives the data, so as to accurately monitor the ground subsidence in the coal mine goaf area, and the depth of the positioning block 5 into the corresponding stratum can be adjusted, so that the depth of the positioning block 5 can be adjusted according to different geological layers, so that the depth of the positioning block 5 can be adjusted according to different geological layers, so that the ground subsidence can be more accurately detected while ensuring that the positioning block 5 is not easily damaged, and because the positioning block 5 is deep in the stratum for detection, the data of the device is more accurate during monitoring.
[0025] A group of threaded fixing rods 13 are threadedly connected to the bottom end of the inner wall of the anti-pressure plate 6, and the bottom ends of the outer walls of the group of threaded fixing rods 13 all penetrate the anti-pressure plate 6; a pair of slide grooves 14 are opened at the bottom end of the inner wall of the anti-pressure plate 6, and the pair of slide grooves 14 are respectively located on both sides of the fixed shaft disk 1; the inner side walls of the pair of slide grooves 14 are slidably connected to support plates 15; the opposite sides of the inner wall of the anti-pressure plate 6 are threadedly connected to second threaded rods 16 through the first square plate, and the bottom ends of the outer walls of the pair of second threaded rods 16 are respectively rotatably connected to the top ends of the outer walls of the pair of support plates 15. When it is necessary to monitor the ground settlement data of the uneven ground, by rotating the second threaded rod 16, the second threaded rod 16 is threadedly connected to the first square plate, so that the second threaded rod The rotation of 16 drives the second threaded rod 16 to move, and the movement of the second threaded rod 16 drives the support plate 15 to move, so that the support plate 15 moves in the slide groove 14, so that when the device is placed in a place with uneven ground, the pair of support plates 15 on both sides of the fixed shaft disk 1 can be adjusted to make the support plates 15 cooperate with the anti-pressure plate 6 to resist the ground, so that the device can be placed stably, so that the device can also be monitored at a position with uneven ground, making the device more practical, and when the device is placed, by rotating the threaded fixing rod 13, the threaded fixing rod 13 can be drilled into the formation, so that the device is fixed, making the device more stable during monitoring, thereby further ensuring the accuracy of the monitoring data.
[0026] A displacement detection plate 17 is fixedly connected to one side of the outer wall of the pressure-proof plate 6; a circular shell 18 is slidably connected to one side of the outer wall of the displacement detection plate 17; a threaded drill rod 19 is threadedly connected to the inner wall of the circular shell 18. When the device is placed, by rotating the threaded drill rod 19, since the threaded drill rod 19 is threadedly connected to the circular shell 18, the threaded drill rod 19 is slowly moved out of the circular shell 18 and gradually extended when the threaded drill rod 19 is rotated. At this time, the threaded drill rod 19 is drilled into the surface or fixed point of the coal mine. When the ground settles as a whole, the device will settle with the overall settlement of the ground. Due to the overall settlement of the ground, the positioning block 5 cannot detect the ground. The horizontal plane settlement degree, and the overall settlement of the ground will cause errors in the detection of the positioning block 5, and the threaded drill rod 19 is drilled into the surface or fixed point of the coal mine, so that when the ground settles, the surface and the fixed point of the coal mine will not settle. At this time, the overall movement of the device will move the displacement detection plate 17, so that the position of the circular shell 18 on the displacement detection plate 17 changes, and the displacement detection plate 17 detects the displacement distance, and then the remote sensing receiver receives the data, so as to determine the settlement of the ground, so that the device has multiple monitoring functions, which cooperate with each other, so that the device can be more accurate and less prone to errors when monitoring ground settlement data.
[0027] The bottom and top of the inner wall of the square through groove 8 are both provided with an arc groove 11; the inner side walls of a pair of arc grooves 11 are both slidably connected with an arc plate 12; the outer walls of a pair of arc plates 12 are both slidably connected to the outer side wall of the positioning block 5 on the opposite side. When the positioning block 5 moves in the square through groove 8 and on the detection rod as the ground settles, because the outer walls of the pair of arc plates 12 are both slidably connected to the outer side wall of the positioning block 5 on the opposite side, the up and down movement of the positioning block 5 will drive the pair of arc plates 12 to move up and down in the arc groove 11, so that the positioning block 5 When the positioning block 5 is moving or not, it can cooperate with a pair of arc plates 12 to block the square through groove 8, so that the rock and soil in the stratum cannot enter the placement tube 3 through the square through groove 8, so that the rock and soil in the stratum cannot enter the placement tube 3 to affect the detection of the displacement detection rod 4, thereby making the detection data of the displacement detection rod 4 more accurate and making the detection of the displacement detection rod 4 less prone to errors or mistakes, thereby ensuring the accuracy of the ground subsidence data and making it less likely for mistakes or errors in the ground subsidence data to affect the judgment of the staff.
[0028] Working principle: by first drilling a reserved hole at the monitoring point, and then placing the device in the reserved hole at the monitoring point, when the device is used, first place the placement tube 3 in the reserved hole, and then place the remote sensing receiver. At this time, the fixed shaft disc 1 and the positioning sensor 2 are both located on the ground surface. After the placement tube 3 is placed, rotate the first threaded rod 10. Since the first threaded rod 10 is threadedly connected to the placement tube 3, the rotation of the first threaded rod 10 causes it to move, and the movement of the first threaded rod 10 drives the fixed plate 9 to move. The movement of the fixed plate 9 drives the displacement detection rod 4 to slide on the bottom end of the outer wall of the fixed shaft disc 1. The movement of the displacement detection rod 4 will drive a group of fixed blocks 7 and positioning blocks 5 to move. At this time, the positioning block 5 will slowly move out of the square through groove 8, so that the positioning block 5 A part of the positioning block 5 moves to the corresponding stratum through the square groove 8 on the placement tube 3. When the ground subsides, the positioning block 5 slides in the square groove 8 and on the displacement detection rod 4. At this time, the displacement detection rod 4 detects the displacement distance, and then the remote sensing receiver receives the data, so as to accurately monitor the ground subsidence in the coal mine goaf area. The depth of the positioning block 5 into the corresponding stratum can be adjusted, so that the depth of the positioning block 5 can be adjusted according to different geological layers, so that the ground subsidence can be more accurately detected while ensuring that the positioning block 5 is not easily damaged. Since the positioning block 5 is deep in the stratum for detection, the data of the device is more accurate during monitoring, and the outer wall of the placement tube 3 is fixed with an anti-pressure plate 6 and a fixed shaft disc 1. and the positioning sensor 2 are all located in the anti-pressure plate 6, so that the fixed shaft disc 1 and the positioning sensor 2 are protected by the anti-pressure plate 6, so that when the staff steps on them or is crushed and collided by mechanical equipment, they are blocked by the anti-pressure plate 6, so that the fixed shaft disc 1 and the positioning sensor 2 are not easily damaged when placed, and through the shape and overall structure of the anti-pressure plate 6, the anti-pressure plate 6 not only contacts more area, has more force-bearing area, so that it is not easy to sink into the ground, and because it is in the shape of an isosceles trapezoid, when the mechanical equipment encounters this device during transportation and it is not easy to bypass it, it can pass smoothly along the outer surface of the anti-pressure plate 6, so that the present device not only solves the problem that the fixed shaft disc 1 and the positioning sensor 2 are easily damaged when placed, but also makes the present device not easy to affect other The transportation of mechanical equipment and the walking of personnel, and when the positioning block 5 moves in the square through groove 8 and on the detection rod with the settlement of the ground, because the outer walls of the pair of arc plates 12 are slidably connected to the outer side walls of the positioning block 5 on opposite sides, the up and down movement of the positioning block 5 will drive the pair of arc plates 12 to move up and down in the arc groove 11, so that the positioning block 5 can cooperate with the pair of arc plates 12 to block the square through groove 8 when it is moving or not, so that the rock and soil in the formation cannot enter the placement tube 3 through the square through groove 8, so that the rock and soil in the formation cannot enter the placement tube 3 to affect the detection of the displacement detection rod 4, so that the detection data of the displacement detection rod 4 is more accurate, and the detection of the displacement detection rod 4 is not prone to errors or mistakes.Thereby ensuring the accuracy of ground subsidence data and making it less likely for mistakes or errors in ground subsidence data to affect the judgment of staff, and after the device is placed, by rotating the threaded drill rod 19, since the threaded drill rod 19 is threadedly connected to the circular shell 18, when the threaded drill rod 19 rotates, the threaded drill rod 19 slowly moves out of the circular shell 18 and gradually extends, and at this time the threaded drill rod 19 is drilled into the surface or fixed point of the coal mine, when the ground as a whole settles, the device will settle with the overall settlement of the ground, because the ground as a whole settles, the positioning block 5 cannot accurately detect the horizontal settlement degree of the ground, and the overall settlement of the ground will cause errors in the detection of the positioning block 5, and the threaded drill rod 19 is drilled into the surface or fixed point of the coal mine, so that when the ground settles, the surface and fixed point of the coal mine will not settle, and at this time the overall movement of the device will move the displacement detection plate 17, so that the position of the circular shell 18 on the displacement detection plate 17 changes, so that the displacement detection plate 17 detects the displacement distance, and then the remote sensing receiver receives the data, thereby determining the ground The settlement situation makes the device have multiple monitoring functions, which cooperate with each other, so that the device can be more accurate and less prone to error when monitoring ground settlement data. When it is necessary to monitor ground settlement data of uneven ground, by rotating the second threaded rod 16, because the second threaded rod 16 is threadedly connected to the first square plate, the rotation of the second threaded rod 16 drives the second threaded rod 16 to move, and the movement of the second threaded rod 16 drives the support plate 15 to move, so that the support plate 15 moves in the slide groove 14, so that when the device is placed in a place with uneven ground, the pair of support plates 15 on both sides of the fixed shaft disc 1 can be adjusted so that the support plate 15 cooperates with the anti-pressure plate 6 to resist the ground, so that the device can be placed stably, so that the device can also be monitored at a position with uneven ground, making the device more practical, and when the device is placed, by rotating the threaded fixing rod 13, the threaded fixing rod 13 can be drilled into the formation, so that the device is fixed, making the device more stable during monitoring, thereby further ensuring the accuracy of the monitoring data.
[0029] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A ground subsidence monitoring device for a coal mine goaf area, comprising a fixed shaft disc (1); a positioning sensor (2) is fixedly connected to the top of the outer wall of the fixed shaft disc (1); a remote sensing receiver is arranged above the fixed shaft disc (1); a placement tube (3) is fixedly connected to the bottom end of the outer wall of the fixed shaft disc (1); a group of positioning blocks (5) are arranged at the bottom end of the outer wall of the fixed shaft disc (1) through a displacement detection rod (4); the characteristics are as follows: The outer wall of the placement tube (3) is fixedly connected with an anti-pressure plate (6), and the anti-pressure plate (6) is in the shape of an isosceles trapezoid, and the anti-pressure plate (6) is hollow; the fixed shaft disc (1) and the positioning sensor (2) are both located inside the anti-pressure plate (6).
2. A coal mine goaf ground subsidence monitoring device according to claim 1, characterized in that: A group of fixing blocks (7) are fixedly connected to the outer wall of the displacement detection rod (4), and the group of fixing blocks (7) and the group of positioning blocks (5) are staggered; the inner side walls of the group of positioning blocks (5) are all slidably connected to the outer side wall of the displacement detection rod (4); the bottom ends of the outer walls of the group of fixing blocks (7) are fixedly connected to springs, and the bottom ends of the outer walls of the group of springs are respectively fixedly connected to the top ends of the outer walls of the group of positioning blocks (5); the outer side wall of the placement tube (3) is provided with a group of square through grooves (8), and the outer side walls of the group of positioning blocks (5) are respectively connected to the outer side walls of the group of fixing blocks (7). The displacement detection rod (4) is in contact with the inner side walls of a group of square through grooves (8); the top end of the outer wall of the displacement detection rod (4) is slidably connected to the bottom end of the outer wall of the fixed shaft disk (1); a fixing plate (9) is fixedly connected to the top end of the outer wall of the displacement detection rod (4); a first threaded rod (10) is rotatably connected to one side of the outer wall of the fixing plate (9), and one end of the outer wall of the first threaded rod (10) passes through the placement tube (3), and the first threaded rod (10) is threadedly connected to the placement tube (3); the first threaded rod (10) is located in the anti-pressure plate (6).
3. A coal mine goaf ground subsidence monitoring device according to claim 2, characterized in that: The bottom and top ends of the inner wall of the square through groove (8) are both provided with arc grooves (11); the inner side walls of a pair of the arc grooves (11) are both slidably connected with arc plates (12); and the outer walls of a pair of the arc plates (12) are both slidably connected to the outer side wall of the positioning block (5) at opposite sides.
4. A coal mine goaf ground subsidence monitoring device according to claim 3, characterized in that: The bottom end of the inner wall of the anti-pressure plate (6) is threadedly connected to a group of threaded fixing rods (13), and the bottom ends of the outer walls of the group of threaded fixing rods (13) all penetrate the anti-pressure plate (6); a pair of sliding grooves (14) are opened at the bottom end of the inner wall of the anti-pressure plate (6), and the pair of sliding grooves (14) are respectively located on both sides of the fixed shaft disk (1); the inner side walls of the pair of sliding grooves (14) are slidably connected to support plates (15); the opposite sides of the inner wall of the anti-pressure plate (6) are threadedly connected to second threaded rods (16) through the first square plate, and the bottom ends of the outer walls of the pair of second threaded rods (16) are respectively rotatably connected to the top ends of the outer walls of the pair of support plates (15).
5. A coal mine goaf ground subsidence monitoring device according to claim 4, characterized in that: A displacement detection plate (17) is fixedly connected to one side of the outer wall of the pressure-proof plate (6); a circular shell (18) is slidably connected to one side of the outer wall of the displacement detection plate (17); and a threaded drill rod (19) is threadedly connected to the inner wall of the circular shell (18).