Automatic monitoring device for surface displacement of coal mine tunnel

Abstract

The invention relates to the technical field of underground coal mine tunnel monitoring, in particular to a coal mine tunnel surface displacement automatic monitoring device which comprises a left monitoring box and a right monitoring box, adjusting blocks are slidably connected to the interiors of the left monitoring box and the right monitoring box, and one end of each adjusting block is rotatably connected with a supporting handle. Adjusting blocks capable of sliding and contracting are arranged in the left monitoring box and the right monitoring box, rotatable supporting handles are arranged at the ends of the adjusting blocks, the supporting handles can be rotated to be folded, equipment is carried in cooperation with moving wheels arranged at the ends of the adjusting blocks, and therefore the using effect of the equipment is improved, and the practicability of the equipment is improved. Meanwhile, a distance adjusting mechanism is arranged between the left monitoring box and the right monitoring box, the left monitoring box and the right monitoring box can be folded and unfolded through the distance adjusting mechanism, the size of the equipment during carrying is further reduced, and therefore the equipment is convenient to carry.

Description

Technical Field

[0001] The invention relates to the technical field of underground coal mine tunnel monitoring, in particular to an automatic monitoring device for surface displacement of a coal mine tunnel. Background Art

[0002] In the process of coal mining, the stability and safety of the tunnel are key factors to ensure the safety of miners and improve production efficiency. The construction of coal mine tunnels generally involves multiple links such as infrastructure construction, excavation operations and subsequent tunnel support. In these links, the surface displacement and settlement of the tunnel are crucial to the safety of the tunnel, especially when large-scale excavation operations are carried out, the stress state of the surrounding strata will change significantly, which is easy to cause surface settlement and tunnel deformation. Therefore, it is necessary to use a monitoring device to automatically monitor the surface displacement of coal mine tunnels.

[0003] After searching, the Chinese patent with the authorization announcement number CN212250150U discloses an automatic monitoring device for the surface displacement of coal mine tunnels, including a base, and a fixed tooth is fixedly installed on the lower surface of the base. The whole device can be stably fixed in the coal mine tunnel through the fixed tooth, and the fixed tooth can firmly grasp the ground, thereby improving the efficiency of the monitoring device for the surface displacement monitoring of the coal mine tunnel. By driving the double-headed screw of the rotating motor to rotate, the mounting seats in the two moving chambers move in opposite directions along the double-headed screw, so that the monitoring device connected by the mounting seat through the connecting rod monitors the two side walls of the coal mine tunnel, and the cylinder is turned on, so that the monitoring device is fixedly installed at the output end of the cylinder to monitor the top wall of the coal mine tunnel. The settlement sensor and the pressure sensor are directly fixed on the inner wall of the coal mine tunnel, and the coal mine tunnel is monitored in real time to see whether there is settlement and fracture. The data collected by the sensor is automatically transmitted to the monitoring personnel, which fully plays a role in monitoring the coal mine tunnel.

[0004] This patented technology uses a drive motor, a rotating motor and a cylinder to adjust the drive of the equipment so that the equipment can be used in lanes of different sizes. However, these electrical devices will undoubtedly increase the overall weight of the equipment, and the equipment in this patent can only be retracted but not folded, resulting in a large space being occupied when the equipment is stored. It is also inconvenient to carry the equipment, which is not conducive to practical application and operation. Summary of the invention

[0005] The object of the present invention is to provide an automatic monitoring device for the surface displacement of a coal mine tunnel, so as to solve the problem that the prior art proposed in the above background technology adopts a driving motor, a rotating motor and a cylinder to adjust the drive of the equipment so that the equipment can be adapted to use in tunnels of different sizes, but these electrical equipment will undoubtedly increase the overall weight of the equipment, and the equipment in the prior art can only be retracted but not folded, resulting in a large space being occupied when the equipment is stored and the problem that the equipment is inconvenient to carry.

[0006] To achieve the above object, the present invention provides an automatic monitoring device for surface displacement of a coal mine tunnel, comprising a left monitoring box and a right monitoring box, wherein the left monitoring box and the right monitoring box are both slidably connected to an adjustment block, one end of each adjustment block is rotatably connected to a support handle, a side of the left monitoring box away from the right monitoring box and an end of the support handle away from the adjustment block are both equipped with a settlement sensor and a pressure sensor, and one end of each adjustment block is rotatably connected to two moving wheels;

[0007] A lifting and fixing mechanism is provided on the side where the left monitoring box and the right monitoring box are close to each other, and the lifting and fixing mechanism is used to fix the height position of the adjustment block. A distance adjustment mechanism is also provided on the side where the left monitoring box and the right monitoring box are close to each other, and the distance adjustment mechanism is used to adjust the distance between the left monitoring box and the right monitoring box. Two rotating fixing mechanisms are installed on the top of the adjustment block, and the rotating fixing mechanisms are used to fix the position of the support handle.

[0008] As a further improvement of the present technical solution, the lifting and fixing mechanism includes a through groove, a fixing screw, a fastening nut and a storage groove. The storage groove is opened inside the left monitoring box and the right monitoring box, and the adjustment block slides inside the storage groove. The through groove is opened on the side close to the left monitoring box and the right monitoring box. The fixing screw is fixed to the bottom of the adjustment block. The fixing screws all pass through the corresponding through grooves, and the fastening nut is threadedly connected to the outside of the fixing screw.

[0009] As a further improvement of the present technical solution, the rotating fixing mechanism includes a groove, a fixing rod, two threaded holes, a fixing plate and a fixing screw. The groove is opened at the top of the adjusting block and is located between the two moving wheels. The supporting handles all pass through the corresponding grooves. The fixing rod is fixedly connected to the outside of the supporting handle and is located inside the groove. The two threaded holes are respectively opened at the top and bottom of the fixing rod away from the supporting handle at one end. The fixing plate is installed on both sides of the adjusting block. The fixing screw is threadedly connected to the fixing plate, and one end of the fixing screw is threadedly connected to one of the threaded holes.

[0010] As a further improvement of the present technical solution, the distance adjustment mechanism includes a first U-shaped groove, two bidirectional screws, four first moving blocks, four connecting rods, a second U-shaped groove, two limit rods and four second moving blocks, the first U-shaped groove is opened on the side of the left monitoring box close to the right monitoring box, the two bidirectional screws are threadedly connected to the inside of the first U-shaped groove, and the corresponding two first moving blocks are symmetrically threadedly connected to the outside of the bidirectional screws, the first moving blocks are slidably connected to the inner wall of the first U-shaped groove, the connecting rods are rotatably connected to the outside of the first moving block, and the middle parts of the corresponding two connecting rods are rotatably connected together, the second U-shaped groove is opened on the side of the right monitoring box close to the left monitoring box, the two limit rods are fixedly connected to the inside of the second U-shaped groove, and the corresponding two second moving blocks are symmetrically slidably connected to the outside of the limit rods, the second moving blocks are slidably connected to the inner wall of the second U-shaped groove, and the end of the connecting rod away from the first moving block is rotatably connected to the corresponding second moving block.

[0011] As a further improvement of the technical solution, a buzzer is installed on one side of the top of the adjustment block inside the left monitoring box, a controller is installed on the outside of the left monitoring box, and the settlement sensor, pressure sensor and buzzer are all electrically connected to the controller.

[0012] As a further improvement of the technical solution, the diameter of the fixing screw is smaller than the width of the through slot, and the outer diameter of the fastening nut is larger than the width of the through slot.

[0013] As a further improvement of the technical solution, the top of one of the bidirectional screws extends to the top of the left monitoring box and is fixedly connected with an adjustment knob.

[0014] As a further improvement of the technical solution, a pulley is installed on the outer side of the bottom of the bidirectional screw, and the two pulleys are connected by a belt drive.

[0015] As a further improvement of the technical solution, the threads on the outer sides of the two bidirectional screws have the same rotation direction.

[0016] As a further improvement of the technical solution, mutually matching notches are provided in the middle parts of the two corresponding connecting rods.

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

[0018] 1. In the automatic monitoring device for surface displacement of coal mine tunnels, a slidable and retractable adjustment block is arranged inside the left monitoring box and the right monitoring box, and a rotatable support handle is arranged at the end of the adjustment block. The support handle can be rotated to fold it, and the device can be carried by cooperating with the moving wheels arranged at the end of the adjustment block, thereby increasing the use effect of the device. At the same time, a distance adjustment mechanism is arranged between the left monitoring box and the right monitoring box, and the distance adjustment mechanism can be used to fold and unfold the left monitoring box and the right monitoring box, thereby further reducing the volume of the device when it is carried, thereby facilitating the carrying of the device.

[0019] 2. In the automatic monitoring device for surface displacement of coal mine tunnels, by arranging a settlement sensor and a pressure sensor on the support handle, the position of the support handle can be adjusted by adjusting the position of the adjustment block inside the left monitoring box or the right monitoring box, so that the settlement sensor and pressure sensor on the support handle can be used in tunnels of different heights.

[0020] 3. In the automatic monitoring device for surface displacement of coal mine tunnels, the distance between the left monitoring box and the right monitoring box can be adjusted through the distance adjustment mechanism, so that the settlement sensor and pressure sensor installed on the outside of the left monitoring box and the right monitoring box can be used in tunnels of different widths, thereby ensuring the use range of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the folded state of the present invention;

[0022] Figure 2 It is a schematic diagram of the unfolded state of the present invention;

[0023] Figure 3 It is a schematic diagram of the carrying state of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the left monitoring box of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the right monitoring box of the present invention;

[0026] Figure 6 It is a schematic diagram of the distance adjustment mechanism structure of the present invention;

[0027] Figure 7 It is a schematic diagram of the split structure of the right monitoring box and the adjustment block of the present invention;

[0028] Figure 8 It is a schematic diagram of the cross-section structure of the support handle of the present invention.

[0029] In the figure: 1. Left monitoring box; 2. Right monitoring box; 3. Adjustment block; 4. Support handle; 5. Sedimentation sensor; 6. Pressure sensor; 7. Moving wheel; 8. Through slot; 9. Fixing screw; 10. Fastening nut; 11. Groove; 12. Fixing rod; 13. Threaded hole; 14. Fixing plate; 15. Fixing screw; 16. First U-shaped slot; 17. Bidirectional screw; 18. First moving block; 19. Connecting rod; 20. Second U-shaped slot; 21. Storage slot; 22. Limiting rod; 23. Second moving block; 24. Buzzer; 25. Controller; 26. Pulley. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In a specific embodiment, Figures 1 to 8 As shown, the automatic monitoring device for surface displacement of a coal mine tunnel includes a left monitoring box 1 and a right monitoring box 2. The left monitoring box 1 and the right monitoring box 2 are both slidably connected with an adjustment block 3, and the adjustment block 3 can slide and retract up and down inside the left monitoring box 1 or the right monitoring box 2. One end of the adjustment block 3 is rotatably connected with a support handle 4. One end of the adjustment block 3 is rotatably connected with two moving wheels 7. After the support handle 4 is folded and stored, the moving wheels 7 can be used to move and transport the device, thereby making it convenient to carry the device.

[0032] The side of the left monitoring box 1 away from the right monitoring box 2 and the end of the support handle 4 away from the adjustment block 3 are both equipped with a settlement sensor 5 and a pressure sensor 6. The settlement sensor 5 and the pressure sensor 6 arranged on the side of the left monitoring box 1 away from the right monitoring box 2 can monitor the side wall of the coal mine tunnel. At the same time, the settlement sensor 5 and the pressure sensor 6 arranged on the end of the support handle 4 away from the adjustment block 3 can monitor the top of the coal mine tunnel and monitor in real time whether there is settlement fracture in the coal mine tunnel. A buzzer 24 is installed on one side of the top of the adjustment block 3 inside the left monitoring box 1. The buzzer 24 can emit an alarm sound to alert the surrounding staff. A controller 25 is installed on the outside of the left monitoring box 1. The settlement sensor 5, pressure sensor 6 and buzzer 24 are all electrically connected to the controller 25. When the settlement sensor 5 and the pressure sensor 6 detect settlement and fracture inside the coal mine tunnel, they transmit signals to the controller 25, and the controller 25 controls the buzzer 24 to emit a sharp alarm sound, thereby alerting the surrounding staff.

[0033] The product model of the sedimentation sensor 5 is HLI-106T, the product model of the pressure sensor 6 is MIK-P300, the product model of the controller 25 is S7-200, and various electronic components and controls, circuits, etc. are installed and set by professional technicians. At the same time, the circuits and controls involved in the present invention are all prior art, and will not be described in detail here.

[0034] The side where the left monitoring box 1 and the right monitoring box 2 are close to each other is provided with a lifting and fixing mechanism, which is used to fix the height position of the adjustment block 3. The lifting and fixing mechanism includes a through slot 8, a fixing screw 9, a fastening nut 10 and a storage slot 21. The storage slot 21 is provided inside the left monitoring box 1 and the right monitoring box 2, and the adjustment block 3 slides inside the storage slot 21. The storage slot 21 can be used to store and fold the adjustment block 3, thereby reducing the volume of the equipment. The through slot 8 is provided on the side where the left monitoring box 1 and the right monitoring box 2 are close to each other. The fixing screw 9 is fixed to the bottom of the adjustment block 3, and the fixing screw 9 passes through the corresponding through slot 8, and the fastening nut 10 is threadedly connected to the outside of the fixing screw 9. After tightening the fastening nut 10, the fastening nut 10 is used to contact the outside of the left monitoring box 1 or the right monitoring box 2, so that the height position of the adjustment block 3 can be fixed. The diameter of the fixing screw 9 is smaller than the width of the through slot 8, so that the fixing screw 9 can move freely up and down inside the through slot 8 following the adjusting block 3. The outer diameter of the fastening nut 10 is larger than the width of the through slot 8, so that the fastening nut 10 can better contact the outer side of the left monitoring box 1 or the right monitoring box 2.

[0035] Two rotating fixing mechanisms are installed on the top of the adjustment block 3, and the rotating fixing mechanisms are used to fix the position of the support handle 4. The rotating fixing mechanism includes a groove 11, a fixing rod 12, two threaded holes 13, a fixing plate 14 and a fixing screw 15. The groove 11 is opened at the top of the adjustment block 3 and is located between the two moving wheels 7. The support handles 4 all pass through the corresponding grooves 11, and the part of the support handle 4 located inside the groove 11 is exposed to the outside. The fixing rod 12 is fixedly connected to the outside of the support handle 4 and is located inside the groove 11. One end of the fixing rod 12 extends to the outside of the groove 11, and the fixing rod 12 can rotate with the support handle 4. The two threaded holes 13 are respectively opened at the top and bottom of the fixing rod 12 away from the end of the support handle 4. The fixing plate 14 is installed on both sides of the adjustment block 3, and the fixing screw 15 is threadedly connected to the fixing plate 14. One end of the fixing screw 15 is threadedly connected to one of the threaded holes 13. When the support handle 4 is rotated to a position where it is needed, the fixing screw 15 is screwed so that one end of the fixing screw enters the corresponding threaded hole 13 , thereby fixing the position of the support handle 4 at this time.

[0036] A distance adjustment mechanism is also provided on the side where the left monitoring box 1 and the right monitoring box 2 are close to each other, and the distance adjustment mechanism is used to adjust the distance between the left monitoring box 1 and the right monitoring box 2. The distance adjustment mechanism includes a first U-shaped groove 16, two bidirectional screws 17, four first moving blocks 18, four connecting rods 19, a second U-shaped groove 20, two limit rods 22 and four second moving blocks 23. The first U-shaped groove 16 is provided on the side of the left monitoring box 1 close to the right monitoring box 2, and the first U-shaped groove 16 is located on the outside of the through groove 8. Both bidirectional screws 17 are threadedly connected to the inside of the first U-shaped groove 16. The top of one of the bidirectional screws 17 extends to the top of the left monitoring box 1 and is fixedly connected with an adjusting knob, and one of the bidirectional screws 17 can be conveniently rotated by using the adjusting knob, and both ends of the bidirectional screw 17 are provided with external threads of opposite rotation directions. The outer side of the bottom of the bidirectional screw 17 is equipped with a pulley 26, and the two pulleys 26 are connected by belt transmission, and the threads on the outer sides of the two bidirectional screws 17 have the same rotation direction. When one of the bidirectional screws 17 rotates, it can drive the pulley 26 connected to its bottom to rotate, so as to utilize the transmission effect of the belt to drive the other pulley 26 and the bidirectional screw 17 to rotate, thereby realizing synchronous transmission operation. The corresponding two first moving blocks 18 are symmetrically threadedly connected to the outer side of the bidirectional screw 17, and the first moving blocks 18 are slidably connected to the inner wall of the first U-shaped groove 16. When the bidirectional screw 17 rotates, it can drive the first moving blocks 18 at both ends of the bidirectional screw 17 to move to the middle or both sides at the same time. The connecting rods 19 are all rotatably connected to the outer side of the first moving block 18, and the middle parts of the corresponding two connecting rods 19 are rotatably connected together, and the middle parts of the corresponding two connecting rods 19 are provided with mutually matching notches, so that the middle parts of the two connecting rods 19 can be rotatably connected together, thereby realizing cross rotation. The second U-shaped groove 20 is provided on the side of the right monitoring box 2 close to the left monitoring box 1, and the second U-shaped groove 20 is also located on the outside of the through groove 8. The two limit rods 22 are fixedly connected to the inside of the second U-shaped groove 20, and the corresponding two second moving blocks 23 are respectively symmetrically slidably connected to the outside of the limit rods 22, and the second moving blocks 23 are slidably connected to the inner wall of the second U-shaped groove 20. The end of the connecting rod 19 away from the first moving block 18 is rotatably connected to the corresponding second moving block 23. When the first moving block 18 moves, the corresponding second moving block 23 can be driven to move accordingly by the action of the connecting rod 19, and the corresponding two connecting rods 19 can be cross-rotated at the same time, so as to achieve the purpose of adjusting the distance between the left monitoring box 1 and the right monitoring box 2.

[0037] Working principle:

[0038] When in use, first place the device at the location of the coal mine tunnel to be monitored, then screw the fixing screw 15 on one side of the adjustment block 3 to disengage one end of the adjustment block from the inside of the threaded hole 13, and then rotate the support handle 4 to rotate it 180 degrees. Figure 2 As shown, after the rotation is completed, the fixing screw 15 on the other side of the adjusting block 3 is screwed so that one end of the fixing screw 15 enters the corresponding threaded hole 13, and the position of the supporting handle 4 can be fixed.

[0039] Then, by turning the adjustment knob on the top of the left monitoring box 1, the corresponding bidirectional screw 17 is driven to rotate, thereby driving the pulley 26 connected to its bottom to rotate, and utilizing the transmission effect of the belt to drive the other pulley 26 and the bidirectional screw 17 to rotate, thereby driving the first moving block 18 threadedly connected to the outside of the bidirectional screw 17 to move inside the first U-shaped groove 16. When the first moving block 18 moves, the corresponding second moving block 23 can be driven to move accordingly by utilizing the effect of the connecting rod 19, and at the same time, the corresponding two connecting rods 19 can be cross-rotated, thereby achieving the purpose of adjusting the distance between the left monitoring box 1 and the right monitoring box 2. Figure 2 As shown, the process stops when the settlement sensor 5 and the pressure sensor 6 on the outside of the left monitoring box 1 and the right monitoring box 2 touch the side wall of the coal mine tunnel.

[0040] Then, the fastening nut 10 can be loosened to allow the adjustment block 3 to slide inside the storage groove 21, and the height position of the adjustment block 3 can be adjusted to drive the support handle 4 to move upward until the settlement sensor 5 and the pressure sensor 6 on the top of the support handle 4 contact the top of the coal mine tunnel, and then the fastening nut 10 is tightened to make the fastening nut 10 contact the outside of the left monitoring box 1 or the right monitoring box 2, so that the height position of the adjustment block 3 can be fixed.

[0041] At this time, the equipment is powered on by an external power supply, so that the settlement sensor 5, pressure sensor 6, buzzer 24 and controller 25 can work. The settlement sensor 5 and pressure sensor 6 are used to monitor the side walls and top of the coal mine tunnel, and real-time monitoring is carried out to see whether there is settlement and fracture in the coal mine tunnel. When the settlement sensor 5 and pressure sensor 6 detect settlement and fracture inside the coal mine tunnel, a signal is transmitted to the controller 25, and the controller 25 is used to control the buzzer 24 to work and emit a sharp alarm sound, thereby alerting the surrounding staff.

[0042] When the device needs to be carried after use, first loosen the fastening nut 10 to adjust the contraction adjustment block 3 so that it shrinks to the inside of the storage slot 21. After the contraction is completed, tighten the fastening nut 10 and use the fastening nut 10 to contact the outside of the left monitoring box 1 or the right monitoring box 2 to fix the position of the adjustment block 3 after contraction. Then, rotate the adjustment knob on the top of the left monitoring box 1 in the opposite direction to drive the two bidirectional screws 17 to rotate, thereby driving the first moving block 18 to move, and use the cross rotation of the connecting rod 19 to drive the corresponding second moving block 23 to move accordingly, thereby shortening the distance between the left monitoring box 1 and the right monitoring box 2.

[0043] Then, the fixing screw 15 can be screwed to disengage one end of the fixing screw 15 from the inside of the threaded hole 13, and the support handle 4 can be rotated 180 degrees to the outside of the left monitoring box 1 and the right monitoring box 2 for storage, and another fixing screw 15 can be screwed to make one end of the fixing screw 15 enter the inside of the corresponding threaded hole 13, so as to fix the position of the support handle 4 again, and then the device can be turned over, such as Figure 3 As shown, the moving wheel 7 at one end of the adjustment block 3 is on the ground. When the ground is flat, the device can be pushed to move by the moving wheel 7. When the ground is uneven, the device can be lifted and moved by the support handle 4, so that the device is convenient to carry.

[0044] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. The automatic monitoring device for surface displacement of coal mine tunnels is characterized by: The invention comprises a left monitoring box (1) and a right monitoring box (2), wherein the inside of the left monitoring box (1) and the right monitoring box (2) are both slidably connected with an adjustment block (3), one end of each of the adjustment blocks (3) is rotatably connected with a support handle (4), a side of the left monitoring box (1) away from the right monitoring box (2) and an end of the support handle (4) away from the adjustment block (3) are both installed with a sedimentation sensor (5) and a pressure sensor (6), and one end of each of the adjustment blocks (3) is rotatably connected with two moving wheels (7); A lifting and fixing mechanism is provided on the side where the left monitoring box (1) and the right monitoring box (2) are close to each other, and the lifting and fixing mechanism is used to fix the height position of the adjustment block (3). A distance adjustment mechanism is also provided on the side where the left monitoring box (1) and the right monitoring box (2) are close to each other, and the distance adjustment mechanism is used to adjust the distance between the left monitoring box (1) and the right monitoring box (2). Two rotating fixing mechanisms are installed on the top of the adjustment block (3), and the rotating fixing mechanisms are used to fix the position of the support handle (4).

2. The automatic monitoring device for surface displacement of coal mine tunnels according to claim 1, characterized in that: The lifting and fixing mechanism comprises a through slot (8), a fixing screw (9), a fastening nut (10) and a receiving slot (21); the receiving slot (21) is provided inside the left monitoring box (1) and the right monitoring box (2); the adjusting block (3) slides inside the receiving slot (21); the through slot (8) is provided on a side close to the left monitoring box (1) and the right monitoring box (2); the fixing screw (9) is fixed to the bottom of the adjusting block (3); the fixing screws (9) all pass through the corresponding through slots (8); and the fastening nut (10) is threadedly connected to the outside of the fixing screw (9).

3. The automatic monitoring device for surface displacement of coal mine tunnels according to claim 1, characterized in that: The rotating fixing mechanism comprises a groove (11), a fixing rod (12), two threaded holes (13), a fixing plate (14) and a fixing screw (15); the groove (11) is formed at the top of the adjusting block (3) and is located between the two moving wheels (7); the supporting handles (4) all pass through the corresponding grooves (11); the fixing rod (12) is fixedly connected to the outside of the supporting handle (4) and is located inside the groove (11); the two threaded holes (13) are respectively formed at the top and bottom of one end of the fixing rod (12) away from the supporting handle (4); the fixing plate (14) is mounted on both sides of the adjusting block (3); the fixing screw (15) is threadedly connected to the fixing plate (14); and one end of the fixing screw (15) is threadedly connected to one of the threaded holes (13).

4. The automatic monitoring device for surface displacement of coal mine tunnels according to claim 1, characterized in that: The distance adjustment mechanism comprises a first U-shaped groove (16), two bidirectional screw rods (17), four first moving blocks (18), four connecting rods (19), a second U-shaped groove (20), two limit rods (22) and four second moving blocks (23), wherein the first U-shaped groove (16) is provided on a side of the left monitoring box (1) close to the right monitoring box (2), the two bidirectional screw rods (17) are both threadedly connected to the inside of the first U-shaped groove (16), the corresponding two first moving blocks (18) are respectively and symmetrically threadedly connected to the outside of the bidirectional screw rods (17), the first moving blocks (18) are both slidably connected to the inner wall of the first U-shaped groove (16), and the connecting rods (19) are both connected to the first U-shaped groove (16). The connecting rods (19) are rotatably connected to the outside of the first moving block (18), and the middle parts of the two corresponding connecting rods (19) are rotatably connected together. The second U-shaped groove (20) is opened on the side of the right monitoring box (2) close to the left monitoring box (1). The two limiting rods (22) are fixedly connected to the inside of the second U-shaped groove (20), and the two corresponding second moving blocks (23) are symmetrically slidably connected to the outside of the limiting rods (22). The second moving blocks (23) are slidably connected to the inner wall of the second U-shaped groove (20), and the end of the connecting rod (19) away from the first moving block (18) is rotatably connected to the corresponding second moving block (23).

5. The automatic monitoring device for surface displacement of coal mine tunnels according to claim 1, characterized in that: A buzzer (24) is installed on one side of the top of the adjustment block (3) located inside the left monitoring box (1), a controller (25) is installed on the outside of the left monitoring box (1), and the settlement sensor (5), the pressure sensor (6) and the buzzer (24) are all electrically connected to the controller (25).

6. The automatic monitoring device for surface displacement of coal mine tunnels according to claim 2, characterized in that: The diameter of the fixing screw (9) is smaller than the width of the through slot (8), and the outer diameter of the fastening nut (10) is larger than the width of the through slot (8).

7. The automatic monitoring device for surface displacement of coal mine tunnels according to claim 4, characterized in that: The top of one of the bidirectional screws (17) extends to the top of the left monitoring box (1) and is fixedly connected to an adjustment knob.

8. The automatic monitoring device for surface displacement of coal mine tunnels according to claim 4, characterized in that: A pulley (26) is installed on the outer side of the bottom of the bidirectional screw (17), and the two pulleys (26) are connected via a belt drive.

9. The automatic monitoring device for surface displacement of coal mine tunnels according to claim 4, characterized in that: The threads on the outer sides of the two bidirectional screws (17) have the same rotation direction.

10. The automatic monitoring device for surface displacement of coal mine tunnels according to claim 4, characterized in that: Mutually matching notches are provided in the middle of the two corresponding connecting rods (19).

Images