A multi-point continuous observation device for deep displacement of coal seam roof

Abstract

The present application relates to coal seam monitoring technical field, and disclose a kind of coal seam roof deep displacement multi-point continuous observation device, including sleeve, casing, end cap and pressure sensor, multiple through-holes are formed in the pipe wall of casing, multiple through-holes are all rotatably connected with support rod by shaft, vertical setting screw rod is provided in casing, transmission mechanism is installed on the rod wall of screw rod, transmission mechanism can quickly drive support rod swing to realize the pre-fixing of casing, so that the observation device is installed in the hole in coal seam, one end of sleeve is fixedly installed at the upper end of casing pipe, support is fixedly connected in sleeve, drive mechanism is installed on the side wall of support. The coal seam roof deep displacement multi-point continuous observation device can change the length of standard section according to demand, is used for continuously observing the deep displacement of coal seam roof in the hole of different depths in coal seam, and can also be stably fixed in the hole of different diameters within a certain range.

Description

Technical Field

[0001] The present invention relates to the technical field of coal seam monitoring, in particular to a multi-point continuous observation device for deep displacement of a coal seam roof. Background Art

[0002] Among the discovered coal mines, some are shallow mines, where surface soil can be directly removed and excavated layer by layer from top to bottom. During mining, the coal seam pressure in these mines is negligible. In addition, there are deep coal and rock formations characterized by high geostress, great mining depth, and complex geological structures. Deep coal and rock formations, subject to high geostress, especially high lateral stress, exhibit mechanical characteristics different from those of shallow rock masses. The rock masses are in a state of high compression deformation or failure limit, increasing the extent of damage and disturbance caused by excavation to the surrounding rock, resulting in intense mine pressure and a heightened risk of rock bursts, coal, and gas outbursts. Therefore, when mining deep coal and rock formations, it is necessary to select appropriate support methods to minimize surrounding rock deformation, ensure the stability of the roadway surrounding rock, and optimize structural parameters and processes. Multi-point displacement meters are primarily used to monitor the displacement of mine rock formations. To precisely observe the displacement of the stratified rock roof, the displacement meters require multiple fixed points.

[0003] At present, it is difficult for existing displacement meters to effectively observe the roof displacement of deep surrounding rock, mainly due to the limitation of the detection depth of the displacement meter. It is difficult to stably control the displacement meter when placing the measuring point in the hole, which is inconvenient for users to use. In addition, the outer diameter of some displacement meters does not completely match the aperture of the drill hole in the mining area. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a multi-point continuous observation device for deep displacement of the coal seam roof, which solves the problem that due to the limitation of the detection depth of the displacement meter, it is difficult to stably control the displacement meter when placing the measuring point in the hole, which is inconvenient for users to use, and the outer diameter of some displacement meters does not completely match the aperture of the borehole in the mining area.

[0006] (2) Technical solution

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a multi-point continuous observation device for deep displacement of a coal seam roof, comprising a sleeve, a casing, an end cap, and a pressure sensor, wherein a plurality of through holes are formed on the wall of the casing, and support rods are rotatably connected to the plurality of through holes via a rotating shaft, a screw rod is vertically arranged in the casing, and a transmission mechanism is installed on the rod wall of the screw rod, wherein the transmission mechanism can quickly drive the support rod to swing to pre-fix the casing, so that the observation device is installed in a hole in the coal seam;

[0008] One end of the sleeve is fixedly mounted at the upper end of the casing, a bracket is fixedly connected to the sleeve, a driving mechanism is installed on the side wall of the bracket, and the driving mechanism is connected to the upper end of the screw rod for locking the pre-fixed casing, so that the observation device is stably fixed in the hole of the coal seam for long-term observation;

[0009] The upper end of the screw rod is fixedly connected with a spline gauge, and the lower end of the screw rod is fixedly connected with a first spline shaft matched with the spline gauge.

[0010] Preferably, the transmission mechanism includes a cross bar, the rod wall of the cross bar is rotatably connected to the rod wall of the screw rod through a ball bearing, the rod wall of the screw rod is rotatably connected to a bearing seat, the bearing seat is fixed to the inner wall of the sleeve, the rod wall of the screw rod is threadedly connected to a threaded sleeve, the side wall of the threaded sleeve is fixedly connected to a circular ring, the lower end of the circular ring is provided with a strong magnetic ring, the upper end of the strong magnetic ring is fixedly connected to a plurality of limiting rods, the side wall of the circular ring is sleeved with the rod wall of the limiting rod through a plurality of limiting holes;

[0011] The side wall of the circular ring is fixedly connected with multiple electromagnets through circular holes, and the electromagnets are located above the strong magnetic ring. The inner wall of the sleeve is vertically provided with multiple limiting protrusions, and the edge of the circular ring is provided with multiple limiting grooves that cooperate with the limiting protrusions.

[0012] Preferably, a first tension spring is fixedly connected to the rod wall of the support rod, one end of the first tension spring is fixedly connected to a limiting ring, and the limiting ring is fixed to the inner wall of the sleeve.

[0013] Preferably, a bent portion is provided at one end of the support rod, the bent portion extends to the bottom of the strong magnetic ring and is provided with a raised portion, and the raised portion is provided with a notch.

[0014] Preferably, a mounting portion is obliquely provided at one end of the support rod, and a pressure plate is rotatably connected to one side of the mounting portion through a pin shaft. A groove that cooperates with the pressure sensor is provided on one side of the pressure plate. The pressure sensor is fixed on one side of the mounting portion, and a second tension spring is fixedly connected to one side of the pressure plate. One end of the second tension spring is fixedly connected to one side of the mounting portion.

[0015] Preferably, the driving mechanism includes a main shaft, which is rotatably connected to the center of the bracket through a rolling bearing and is coaxial with the sleeve, the lower end of the main shaft is fixedly connected to a second spline shaft, the second spline shaft cooperates with the spline gauge at the upper end of the screw rod, a worm gear is fixedly connected to the shaft wall of the main shaft, one side of the worm gear is engaged with a worm, and the worm is rotatably connected to the bracket through a needle bearing, one end of the worm gear is fixedly connected to a first bevel gear, one side of the first bevel gear is engaged with a second bevel gear, the side wall of the bracket is fixedly connected to a motor, and the output end of the motor is fixedly connected to one side of the second bevel gear coaxially.

[0016] Preferably, the upper end of the sleeve is provided with a first constriction portion, the lower end of the sleeve is inserted into the first constriction portion and fixedly connected by a plurality of hexagonal bolts, the upper end of the sleeve is provided with a conical cap, the lower end of the conical cap is provided with a threaded portion, and the conical cap is connected to the sleeve through the threaded portion.

[0017] Preferably, a hanging ring is fixedly connected to the upper end of the conical cap, and a position sensor is fixedly connected to the inner side of the conical cap.

[0018] Preferably, a second constriction portion is provided at the upper end of the end cap, the second constriction portion cooperates with the pipe mouth of the sleeve, the pipe wall of the sleeve is fixedly connected to the second constriction portion by a plurality of fixing bolts, and a water level sensor is fixedly connected inside the end cap.

[0019] (3) Beneficial effects

[0020] Compared with the prior art, the present invention provides a multi-point continuous observation device for deep displacement of coal seam roof, which has the following beneficial effects:

[0021] 1. When the present invention is in use, each casing and the transmission mechanism installed inside it together form a standard unit of an observation device. When in use, at least two or more standard units can be used to form a standard section that can continuously observe multiple points. During installation, the first bundle mouth is inserted into the lower end of the adjacent casing and locked and fixed with an inner hexagonal bolt. A sufficient number of standard units are assembled in sequence according to needs. Finally, the sleeve is inserted into the first bundle mouth at the upper end of the standard section, and the end cap is inserted into the pipe mouth of a casing at the lower end of the standard section, and fixed with the same inner hexagonal bolt. In this way, the amount of standard units used can be selected according to needs, and the length of the standard section can be changed. It is used to continuously observe the deep displacement of the coal seam roof in holes of different depths in the coal seam. When the standard section is inserted into the hole, the transmission mechanism is started to quickly drive the support rod to swing to pre-fix the casing. Thereafter, the driving mechanism is started to make the screw work to lock the pre-fixed casing, so that the observation device is stably fixed in the hole of the coal seam for long-term observation, which is convenient for technicians to use.

[0022] 2. The present invention is provided with a transmission mechanism. When in use, when the assembled standard section is inserted into the hole, the electromagnet is turned on to generate the same magnetic pole as the upper part of the strong magnetic ring. At this time, the mutual repulsion force generated can push the strong magnetic ring downward to squeeze the bent part of the support rod. At this time, the support rod is forced to swing around the rotating shaft. After the swing, one end of the support rod drives the pressure plate to contact the side wall of the hole. At this time, the standard section can be pre-fixed. After reaching the predetermined depth, the driving mechanism is started to drive the screw rod to rotate and move the threaded sleeve downward. The downward movement of the threaded sleeve drives the circular ring to move downward and move the strong magnetic ring, and can continue to push the strong magnetic ring to move. At this time, the resistance encountered by the pressure plate is transmitted to the pressure sensor, and the pressure sensor transmits the collected data to the external receiving device through the wire. When the pressure reaches a certain value, the driving mechanism stops working, so that the observation device can be stably fixed in the hole of the coal seam for long-term observation.

[0023] 3. The present invention is provided with a driving mechanism. When in use, the starting motor drives the second bevel gear to rotate the first bevel gear. The rotation of the first bevel gear drives the worm to rotate the worm wheel. The rotation of the worm wheel drives the main shaft to rotate the second spline shaft. When the second spline shaft rotates, it drives the spline gauge to rotate the lead screw. When the lead screw rotates, it can drive the transmission mechanism to work. In addition, after the standard section is assembled, as shown in the figure, the adjacent lead screws in the standard section are linked through the first spline shaft and the spline gauge. In this way, the transmission mechanisms in multiple standard units can be driven to work at the same time, so that multiple support rods are extended out of the casing to achieve the effect of multi-point continuous monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of a multi-point continuous observation device for deep displacement of coal seam roof proposed by the present invention. Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the structure of a multi-point continuous observation device for deep displacement of coal seam roof proposed by the present invention. Figure 2 ;

[0026] Figure 3 This is a cross-sectional view of a multi-point continuous observation device for deep displacement of a coal seam roof proposed by the present invention;

[0027] Figure 4 This is a schematic structural diagram of the first spline shaft, spline gauge, sleeve and screw rod in a multi-point continuous observation device for deep displacement of coal seam roof proposed by the present invention;

[0028] Figure 5 This is a schematic structural diagram of the casing, support rods and pressure plates in a multi-point continuous observation device for deep displacement of coal seam roof proposed by the present invention;

[0029] Figure 6 The invention proposes a multi-point continuous observation device for deep displacement of coal seam roof. Figure 5 sectional view of

[0030] Figure 7 The invention proposes a multi-point continuous observation device for deep displacement of coal seam roof. Figure 2 The effect diagram of the maximum tilt angle of the middle support rod in the casing;

[0031] Figure 8 This is a schematic structural diagram of a circular ring, an electromagnet, a strong magnetic ring and a limit rod in a multi-point continuous observation device for deep displacement of a coal seam roof proposed by the present invention;

[0032] Figure 9 This is a schematic structural diagram of the support rod, pressure plate and pressure sensor in a multi-point continuous observation device for deep displacement of coal seam roof proposed by the present invention;

[0033] Figure 10 This is a cross-sectional view of a sleeve and a conical cap in a multi-point continuous observation device for deep displacement of a coal seam roof proposed by the present invention;

[0034] Figure 11 This is a schematic structural diagram of the end cap in a multi-point continuous observation device for deep displacement of coal seam roof proposed by the present invention;

[0035] Figure 12 This is a structural schematic diagram of the conical cap in a multi-point continuous observation device for deep displacement of a coal seam roof proposed by the present invention.

[0036] In the figure: 1. sleeve; 2. support rod; 3. pressure plate; 4. end cap; 5. sleeve; 6. conical cap; 7. lifting ring; 8. first tension spring; 9. spline gauge; 10. electromagnet; 11. circular ring; 12. limiting ring; 13. water level sensor; 14. threaded portion; 15. limiting protrusion; 16. through hole; 17. screw rod; 18. first spline shaft; 19. first beam mouth; 20. second beam mouth; 21. limiting groove; 22. strong magnetic ring; 23. limiting rod; 24. threaded sleeve; 25. bending portion; 26. notch; 27. protrusion; 28. second tension spring; 29. ​​mounting portion; 30. pressure sensor; 31. bracket; 32. motor; 33. worm gear; 34. worm; 35. first bevel gear; 36. second bevel gear; 37. second spline shaft; 38. position sensor. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0038] Example 1: Refer to the attached Figure 1-12 A multi-point continuous observation device for deep displacement of a coal seam roof comprises a sleeve 5, a casing 1, an end cap 4, and a pressure sensor 30. The casing 1 has a plurality of through holes 16 formed on its wall. A support rod 2 is rotatably connected to each of the through holes 16 via a rotating shaft. A screw rod 17 is vertically disposed within the casing 1. A transmission mechanism is mounted on the wall of the screw rod 17. The transmission mechanism can rapidly drive the support rod 2 to swing, thereby pre-fixing the casing 1 and enabling the observation device to be installed in a hole in the coal seam.

[0039] One end of the sleeve 5 is fixedly mounted at the upper end of the casing 1. A bracket 31 is fixedly connected to the sleeve 5. A driving mechanism is installed on the side wall of the bracket 31. The driving mechanism is connected to the upper end of the screw rod 17 and is used to lock the pre-fixed casing 1 so that the observation device can be stably fixed in the hole of the coal seam for long-term observation. The upper end of the casing 1 is provided with a first bundle portion 19. The lower end of the sleeve 5 is inserted into the first bundle portion 19 and fixedly connected by a plurality of hexagon socket bolts. The upper end of the sleeve 5 is provided with a A conical cap 6 is provided, and a threaded portion 14 is provided at the lower end of the conical cap 6. The conical cap 6 is connected to the sleeve 5 through the threaded portion 14. The upper end of the conical cap 6 is fixedly connected to a hanging ring 7. The inner side of the conical cap 6 is fixedly connected to a position sensor 38. The upper end of the end cap 4 is provided with a second beam portion 20. The second beam portion 20 cooperates with the pipe mouth of the sleeve 1. The pipe wall of the sleeve 1 is fixedly connected to the second beam portion 20 by a plurality of fixing bolts. A water level sensor 13 is fixedly connected to the end cap 4.

[0040] like Figure 5-7 As shown, each sleeve 1 and the transmission mechanism installed inside it together constitute a standard unit of the observation device. When in use, at least two or more standard units can be used to form a standard section that can continuously observe multiple points. When installing, the first bundle portion 19 is inserted into the lower end of the adjacent sleeve 1 and locked and fixed with a hexagon socket bolt. A sufficient amount of standard units are assembled in sequence according to needs, and finally the sleeve 5 is inserted into the first bundle portion 19 at the upper end of the standard section, and the end cap is inserted into the pipe mouth of a sleeve 1 at the lower end of the standard section and fixed with the same hexagon socket bolt. In this way, the amount of standard units used can be selected according to needs, and the amount of standard units can be changed. The length of the standard section is used to continuously observe the deep displacement of the coal seam roof in holes of different depths in the coal seam. When the standard section is inserted into the hole, the transmission mechanism is started to quickly drive the support rod 2 to swing to pre-fix the casing 1. Thereafter, the driving mechanism is started to make the screw rod 17 work to lock the pre-fixed casing 1, so that the observation device can be stably fixed in the hole of the coal seam for long-term observation, which is convenient for technicians to use. Each time a standard section is assembled, a quick-insert connector is required to connect the connectors of the pressure sensor 30, the position sensor 38 and the water level sensor. This technology has been widely used in life, and those skilled in the art already know it, so no more details will be given.

[0041] Example 2: Based on Example 1, the difference is that;

[0042] Refer to the attached Figure 5-9 The transmission mechanism includes a cross bar, the rod wall of the cross bar is rotatably connected to the rod wall of the screw rod 17 through a ball bearing, the rod wall of the screw rod 17 is rotatably connected to a bearing seat, the bearing seat is fixed to the inner wall of the sleeve 1, the rod wall of the screw rod 17 is threadedly connected to a threaded sleeve 24, the side wall of the threaded sleeve 24 is fixedly connected to a ring 11, the lower end of the ring 11 is provided with a strong magnetic ring 22, the upper end of the strong magnetic ring 22 is fixedly connected to a plurality of limit rods 23, the side wall of the ring 11 is fixed by a plurality of limit rods The positioning hole is socketed with the rod wall of the limiting rod 23, and the side wall of the ring 11 is fixedly connected with multiple electromagnets 10 through the circular hole, and the electromagnet 10 is located above the strong magnetic ring 22. The inner wall of the sleeve 1 is vertically provided with multiple limiting protrusions 15, and the edge of the ring 11 is provided with multiple limiting grooves 21 that cooperate with the limiting protrusions 15. The upper end of the screw rod 17 is fixedly connected with the spline gauge 9, and the lower end of the screw rod 17 is fixedly connected with the first spline shaft 18 that cooperates with the spline gauge 9.

[0043] A first tension spring 8 is fixedly connected to the rod wall of the support rod 2, one end of the first tension spring 8 is fixedly connected to the limit ring 12, the limit ring 12 is fixed to the inner wall of the sleeve 1, and a bending portion 25 is provided at one end of the support rod 2. The bending portion 25 extends to the bottom of the strong magnetic ring 22 and is provided with a protrusion 27, and the protrusion 27 is provided with a notch 26. A mounting portion 29 is obliquely provided at one end of the support rod 2, and one side of the mounting portion 29 is rotatably connected to a pressure plate 3 through a pin shaft. A groove matching a pressure sensor 30 is provided on one side of the pressure plate 3, and the pressure sensor 30 is fixed on one side of the mounting portion 29. A second tension spring 28 is fixedly connected to one side of the pressure plate 3, and one end of the second tension spring 28 is fixedly connected to one side of the mounting portion 29.

[0044] The present invention is provided with a transmission mechanism. When in use, when the assembled standard section is inserted into the hole, the electromagnet 10 is turned on to generate the same magnetic pole as the upper part of the strong magnetic ring 22. At this time, the mutual repulsive force generated can push the strong magnetic ring 22 to move downward to squeeze the bent portion 25 of the support rod 2. At this time, the support rod 2 is forced to swing around the rotating shaft. After the swing, one end of the support rod 2 drives the pressure plate 3 to contact the side wall of the hole. At this time, the pre-fixation of the standard section can be completed. After reaching the predetermined depth, the driving mechanism is started to drive the screw rod 17 to rotate to make the threaded sleeve 24 move downward. The threaded sleeve 24 moves downward and drives the ring 11 to move downward and contact the strong magnetic ring 2 2 moves and can continue to push the strong magnetic ring 22 to move. At this time, the resistance experienced by the pressure plate 3 is transmitted to the pressure sensor 30, and the pressure sensor 30 transmits the collected data to the external receiving device through the wire. When the pressure reaches a certain value, the driving mechanism stops working, so that the observation device can be stably fixed in the hole of the coal seam for long-term observation. Subsequently, the values ​​of each pressure sensor after a period of rest are recorded as initial observation data, which is convenient for comparison with the values ​​of subsequent continuous observations. The result of comparison between the subsequent collected values ​​and the initial observation values ​​is used to determine the displacement of the deep coal seam roof.

[0045] Example 3: Based on Example 1, the difference is that;

[0046] Refer to the attached Figure 3 and Figure 10 The driving mechanism includes a main shaft, which is rotatably connected to the center of the bracket 31 through a rolling bearing and is coaxial with the sleeve 5. The lower end of the main shaft is fixedly connected to a second spline shaft 37, which cooperates with the spline gauge 9 at the upper end of the screw rod 17. A worm gear 33 is fixedly connected to the shaft wall of the main shaft, and a worm 34 is engaged with one side of the worm gear 33. The worm 34 is rotatably connected to the bracket 31 through a needle bearing. One end of the worm 34 is fixedly connected to a first bevel gear 35, and one side of the first bevel gear 35 is engaged with a second bevel gear 36. The side wall of the bracket 31 is fixedly connected to a motor 32, and the output end of the motor 32 is fixedly connected to one side of the second bevel gear 36 coaxially.

[0047] The present invention is provided with a drive mechanism. When in use, the starting motor drives the second bevel gear 36 to rotate the first bevel gear 35. The rotation of the first bevel gear 35 drives the worm 34 to rotate the worm wheel 33. The rotation of the worm wheel 33 drives the main shaft to rotate the second spline shaft 37. When the second spline shaft 37 rotates, it drives the spline gauge 9 to rotate the screw rod 17. When the screw rod 17 rotates, it can drive the transmission mechanism to work. In addition, after the standard section is assembled, as shown in FIG. Figure 3 As shown, the adjacent screw rods 17 in the standard section are linked through the first spline shaft 18 and the spline gauge 9, so that the transmission mechanisms in multiple standard units can be driven to work at the same time, so that multiple support rods are extended out of the sleeve 1 to achieve the effect of multi-point continuous monitoring.

[0048] It should be noted that the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multi-point continuous observation device for deep displacement of a coal seam roof, comprising a sleeve (5), a casing (1), an end cap (4) and a pressure sensor (30), wherein the end cap (4) is mounted at the pipe mouth of the casing (1), and is characterized in that: A plurality of through holes (16) are provided on the wall of the casing (1), and a support rod (2) is rotatably connected to each of the plurality of through holes (16) via a rotating shaft. The pressure sensor (30) is mounted on one end of the support rod (2). A screw rod (17) is vertically arranged in the casing (1), and a transmission mechanism is mounted on the rod wall of the screw rod (17). The transmission mechanism can quickly drive the support rod (2) to swing to pre-fix the casing (1), so that the observation device is installed in a hole on the coal seam. The transmission mechanism includes a cross bar, the rod wall of the cross bar is rotatably connected to the rod wall of the screw rod (17) through a ball bearing, the rod wall of the screw rod (17) is rotatably connected to a bearing seat, the bearing seat is fixed to the inner wall of the sleeve (1), the rod wall of the screw rod (17) is threadedly connected to a threaded sleeve (24), the side wall of the threaded sleeve (24) is fixedly connected to a ring (11), the lower end of the ring (11) is provided with a strong magnetic ring (22), the upper end of the strong magnetic ring (22) is fixedly connected to a plurality of limiting rods (23), the side wall of the ring (11) is sleeved with the rod wall of the limiting rod (23) through a plurality of limiting holes; The side wall of the circular ring (11) is fixedly connected to a plurality of electromagnets (10) through circular holes, and the electromagnets (10) are located above the strong magnetic ring (22); the inner wall of the sleeve (1) is vertically provided with a plurality of limiting protrusions (15); and the edge of the circular ring (11) is provided with a plurality of limiting grooves (21) that cooperate with the limiting protrusions (15); One end of the sleeve (5) is fixedly mounted on the upper end of the casing (1), a bracket (31) is fixedly connected inside the sleeve (5), a driving mechanism is mounted on the side wall of the bracket (31), and the driving mechanism is connected to the upper end of the screw rod (17) for locking the pre-fixed casing (1), so that the observation device is stably fixed in the hole of the coal seam for long-term observation; The upper end of the screw rod (17) is fixedly connected to a spline gauge (9), and the lower end of the screw rod (17) is fixedly connected to a first spline shaft (18) that matches the spline gauge (9).

2. The multi-point continuous observation device for deep displacement of coal seam roof according to claim 1, characterized in that: A first tension spring (8) is fixedly connected to the rod wall of the support rod (2), one end of the first tension spring (8) is fixedly connected to a limiting ring (12), and the limiting ring (12) is fixed to the inner wall of the sleeve (1).

3. The multi-point continuous observation device for deep displacement of coal seam roof according to claim 1, characterized in that: One end of the support rod (2) is provided with a bent portion (25), the bent portion (25) extends to the bottom of the strong magnetic ring (22) and is provided with a raised portion (27), and the raised portion (27) is provided with a notch (26).

4. The multi-point continuous observation device for deep displacement of coal seam roof according to claim 1, characterized in that: One end of the support rod (2) is provided with a mounting portion (29) at an angle, one side of the mounting portion (29) is rotatably connected to a pressure plate (3) via a pin shaft, one side of the pressure plate (3) is provided with a groove that matches the pressure sensor (30), the pressure sensor (30) is fixed to one side of the mounting portion (29), one side of the pressure plate (3) is fixedly connected to a second tension spring (28), and one end of the second tension spring (28) is fixedly connected to one side of the mounting portion (29).

5. The multi-point continuous observation device for deep displacement of coal seam roof according to claim 1, characterized in that: The driving mechanism includes a main shaft, which is rotatably connected to the center of the bracket (31) through a rolling bearing and is coaxial with the sleeve (5), the lower end of the main shaft is fixedly connected to a second spline shaft (37), the second spline shaft (37) cooperates with the spline gauge (9) at the upper end of the screw rod (17), a worm wheel (33) is fixedly connected to the shaft wall of the main shaft, one side of the worm wheel (33) is meshed with a worm (34), the worm (34) is rotatably connected to the bracket (31) through a needle bearing, one end of the worm (34) is fixedly connected to a first bevel gear (35), one side of the first bevel gear (35) is meshed with a second bevel gear (36), the side wall of the bracket (31) is fixedly connected to a motor (32), and the output end of the motor (32) is coaxially fixedly connected to one side of the second bevel gear (36).

6. The multi-point continuous observation device for deep displacement of coal seam roof according to claim 1, characterized in that: The upper end of the sleeve (1) is provided with a first constriction portion (19), the lower end of the sleeve (5) is inserted into the first constriction portion (19) and fixedly connected by a plurality of hexagon socket bolts, the upper end of the sleeve (5) is provided with a conical cap (6), the lower end of the conical cap (6) is provided with a threaded portion (14), and the conical cap (6) is connected to the sleeve (5) via the threaded portion (14).

7. The multi-point continuous observation device for deep displacement of coal seam roof according to claim 6, characterized in that: The upper end of the conical cap (6) is fixedly connected to a lifting ring (7), and the inner side of the conical cap (6) is fixedly connected to a position sensor (38).

8. The multi-point continuous observation device for deep displacement of coal seam roof according to claim 1, characterized in that: A second constriction portion (20) is provided at the upper end of the end cap (4), and the second constriction portion (20) cooperates with the pipe mouth of the sleeve (1). The pipe wall of the sleeve (1) is fixedly connected to the second constriction portion (20) via a plurality of fixing bolts, and a water level sensor (13) is fixedly connected inside the end cap (4).

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