Underground pressure monitoring device for mining

Abstract

The invention discloses an underground ground pressure monitoring device for mining, and relates to the related field of mining, the underground ground pressure monitoring device comprises a base, a first threaded rod is rotatably arranged at the top of the base, the top of the first threaded rod is in threaded connection with the interior of a rotating sleeve, and the outer side of the top of a negative pressure suction cup is attached to the outer wall of a mine top supporting plate; the outer side of the attaching disc is arranged on the outer sides of the connecting frame and the bearing frame in a sliding mode, and flexible supporting mechanisms are arranged on the inner sides of the attaching disc and the bearing frame. According to the underground ground pressure monitoring device for mining, an adjusting mechanism is arranged to enable a stress sensor to be stably attached to the side wall of a mine, a negative pressure adsorption mechanism is matched with a negative pressure suction cup to fix the top end of the device, a flexible supporting mechanism is buffered through hydraulic oil and stretches out and draws back through a reset spring, and an adjustable threaded rod structure gives consideration to installation flexibility and stress stability; the device effectively adapts to complex mine environments, and the accuracy of ground pressure monitoring data and the application range of the device are remarkably improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of mine exploitation, and particularly relates to an underground ground pressure monitoring device for mine exploitation. BACKGROUND

[0002] Rock burst, also known as rock burst, refers to the sudden and violent release of the potential energy of a rock mass under certain conditions during the process of mine exploitation. The release can cause the rock mass to suddenly burst, collapse or be thrown out, which is very destructive and is one of the main safety hazards faced by deep mines. In order to avoid the above situation, an underground ground pressure monitoring device needs to be used.

[0003] There are many types of existing monitoring devices, but most of the existing coal mine ground pressure monitoring devices are fixed in a certain position and cannot be flexibly changed, which reduces the flexibility of the monitoring device. In order to solve the above problem, reference can be made to the existing technology (Chinese patent with application number CN202510600925.8 and application date of May 12, 2025) which discloses a coal mine rock burst monitoring and warning device. The warning device is provided with mounting disc one and mounting disc two, a lead screw is arranged between mounting disc one and mounting disc two, a ball nut is arranged on the lead screw, in the initial state, the adjusting rod one and the adjusting rod two are in an inclined state, and the grating three-dimensional stress sensor is distributed on the adjusting rod two in a vertical distribution, so that the monitoring device can be placed in the mine, and the grating three-dimensional stress sensor is attached to the inner wall of the mine to monitor the rock layer inside the coal mine. Reference can also be made to the existing technology (Chinese patent with application number CN202310404133.4 and application date of April 17, 2023) which discloses a coal mine rock burst monitoring and warning device. The warning device is provided with a multi-point measuring mechanism and a positioning module, so that the warning device can efficiently complete the monitoring operation of the coal mine rock burst. On one hand, the device can realize multi-angle synchronous monitoring of the monitoring area, and on the other hand, it can realize multi-point synchronous monitoring during monitoring. Through the realization of the above multi-angle and multi-point synchronous monitoring functions, the multifunctionality of the monitoring and warning device is effectively improved. Reference can also be made to the existing technology (Chinese patent with application number CN202110714165.5 and application date of June 25, 2021) which discloses a ground pressure monitoring device and method. The monitoring device utilizes the cooperation of the groove on the blocking piece and the wedge-shaped blocking block to form a blocking part of the clamping hole. The separate blocking piece and blocking block facilitate the installation, compression and loosening and removal of the baffle, so as to meet the requirements of gradual locking and convenient disassembly and assembly.

[0004] Although the above device can be installed, there are still some deficiencies in the process of installation, for example, when the monitoring device is installed in the inside of the mine, the stability of the force of the monitoring device needs to be ensured, the top of the monitoring device is contacted with the supporting plate of the top of the mine, but during the excavation of the mine, the top of the mine cannot be ensured to be flat, at this time the stress point of the monitoring device is easy to tilt, and then the monitoring data is not accurate in the later period.

[0005] Therefore, we propose a mine underground ground pressure monitoring device to solve the problems raised in the above. SUMMARY

[0006] The purpose of the present application is to provide a mine underground ground pressure monitoring device to solve the problems raised in the above background art that the monitoring device installed in the inside of the mine needs to ensure the stability of the force of the monitoring device, the top of the monitoring device is contacted with the top of the mine, but during the excavation of the mine, the top of the mine cannot be ensured to be flat, at this time the stress point of the monitoring device is easy to tilt, and then the monitoring data is not accurate in the later period.

[0007] To achieve the above purpose, the present application provides the following technical scheme: a mine underground ground pressure monitoring device, comprising a base, a first threaded rod rotatably arranged on the top of the base, a connecting frame rotatably arranged on the top of the rotating sleeve, and a bearing frame integrally arranged on the connecting frame; an adjusting mechanism is arranged between the rotating sleeve and the base, a stress sensor is arranged on the adjusting mechanism, and the outer side of the stress sensor is attached to the outer wall of the mine sidewall supporting plate; a second threaded rod is fixed on the top of the rotating sleeve, the second threaded rod is rotatably penetrated into the inside of the bearing frame, a negative pressure suction mechanism is connected to the second threaded rod, a negative pressure suction disc is communicated on the negative pressure suction mechanism, the negative pressure suction disc is installed on the top of the attachment disc, and the outer side of the top of the negative pressure suction disc is attached to the outer wall of the mine top supporting plate; the attachment disc is slidably arranged on the outer side of the connecting frame and the bearing frame, and a flexible support mechanism is arranged on the inner side of the attachment disc and the bearing frame.

[0008] Preferably, the adjusting mechanism comprises a second rotating rod rotatably arranged on the edge of the top of the base, a first rotating rod rotatably arranged on the lower edge of the rotating sleeve, the first rotating rod and the second rotating rod are hingedly connected, a guide groove is jointly penetrated in the first rotating rod and the second rotating rod, and the stress sensor is installed in the guide groove.

[0009] Preferably, a first gasket is fixed on one side of the stress sensor, a screw is fixed at the center of the first gasket, and a locking bolt is threadedly connected to the side away from the first gasket of the screw.

[0010] Preferably, the negative pressure adsorption mechanism comprises a threaded connection cylinder screwed on the top of the second threaded rod, a piston block is fixed outside the top of the threaded connection cylinder, a square groove is slidably arranged outside the piston block, the square groove is arranged in the inside of a fixed cylinder, and the top of the fixed cylinder is communicated with the negative pressure suction disc through an air suction hose.

[0011] Preferably, the number of threads of the second threaded rod is the same as that of the first threaded rod, and the thread direction of the second threaded rod is opposite to that of the first threaded rod.

[0012] Preferably, a rubber ring is nested outside the piston block, and the outer side of the rubber ring is attached to the inner wall of the square groove; and the top of the threaded connection cylinder is fixed to the top of the bearing frame through a support.

[0013] Preferably, the flexible support mechanism comprises a support installed on the inside of the fitting disc and the bearing frame, an oil tank is connected to the bottom of the support through a pipeline, an oil delivery pipeline is communicated with the bottom end of the oil tank, the outer end of the oil delivery pipeline is communicated with the bottom end of a rotating containing pipe, an extension moving rod is slidably arranged at the other end of the rotating containing pipe, and a rotating shaft is rotatably arranged at the top of the extension moving rod.

[0014] Preferably, the rotating shaft is fixed to the bottom outer wall of the fitting disc; and a reset element is arranged in the inside of the rotating containing pipe and the extension moving rod, and the reset element is a connecting spring.

[0015] Preferably, the support comprises an upper moving cylinder, the bottom end of the upper moving cylinder is slidably arranged in the inside of a lower fixed cylinder, and a reset spring is arranged between the upper moving cylinder and the lower fixed cylinder; universal shafts are arranged outside the upper moving cylinder and the lower fixed cylinder, and the outer sides of the two groups of universal shafts are rotatably arranged on the inside of the fitting disc and the top of the bearing frame.

[0016] Preferably, the support is arranged at equal angles about the center position of the bearing frame; the elastic force of the reset spring is greater than that of the reset element; and a piston is arranged at the bottom end of the upper moving cylinder, and hydraulic oil is arranged between the piston and the lower fixed cylinder.

[0017] Compared with the prior art, the device for monitoring underground ground pressure in mine exploitation has the following advantages: the adjusting mechanism is arranged to enable the stress sensor to stably adhere to the sidewall of the mine, the negative pressure adsorption mechanism cooperates with the negative pressure suction disc fixing device at the top end, the flexible support mechanism is buffered and retracted by the hydraulic oil and the reset spring, the extension moving rod and the rotating shaft are self-adaptively adjusted to apply balanced stress to the lower end of the fitting disc to avoid overall deviation; meanwhile, the adjustable threaded rod structure takes into account the installation flexibility and stress stability, effectively adapts to the complex environment of the mine, and significantly improves the accuracy of the ground pressure monitoring data and the application range of the device. 1. The flexible support mechanism accurately responds to the irregularities of the upper mold plate of the mine, and the support member can buffer the local stress of the fitting disc in real time through the hydraulic oil and the return spring in the upper moving cylinder and the lower fixed cylinder; the sliding and rotating cooperation of the extension moving rod and the rotating shaft can adapt to the support demand of different positions of the fitting disc, avoiding the local inclination of the fitting disc due to the protrusions or depressions of the upper mold plate; the flexible support mechanism can apply balanced stress to the lower end of the fitting disc, ensuring the stable overall stress of the monitoring device, providing reliable structural support for the accurate collection of ground pressure data by the stress sensor, and making up for the defects of the existing device lacking adaptive support.

[0018] 2. The adjusting mechanism realizes flexible fitting of the stress sensor to different radii of the mine sidewall through the hinging and guiding groove of the first rotating rod and the second rotating rod; the negative pressure adsorption mechanism generates negative pressure by the sliding of the piston block in the square groove, so that the negative pressure suction disc stably adsorbs the top supporting plate. The height adjustment is realized by the screw rod with reverse threads, so that the device can be adapted to different sizes of mine space without being fixed in a single position, solving the problem of poor flexibility and incomplete monitoring of the existing device due to position limitation after installation BRIEF DESCRIPTION OF DRAWINGS Figure 1 is a front view structural schematic diagram of the present application; Figure 2 is a front view structural schematic diagram of the first rotating rod of the present application; Figure 3 is a front view structural schematic diagram of the stress sensor of the present application; Figure 4 is a front view structural schematic diagram of the fitting disc of the present application; Figure 5 is a front view structural schematic diagram of the fitting disc of the present application; Figure 6 is a front view structural schematic diagram of the fixed cylinder of the present application; Figure 7 is a front view structural schematic diagram of the present application Figure 6 is an enlarged structural schematic diagram of position A of the present application; Figure 8 is a front view structural schematic diagram of the support member of the present application; Figure 9 is an enlarged structural schematic diagram of position B of the present application. Figure 5

[0019] ​In the figure: 1, base; 2, first threaded rod; 3, rotating sleeve; 4, first rotating rod; 5, second rotating rod; 6, stress sensor; 61, first gasket; 62, screw rod; 63, locking bolt; 7, guide groove; 8, connecting frame; 9, bearing frame; 10, fitting disc; 11, second threaded rod; 12, threaded connecting cylinder; 13, piston block; 14, square groove; 15, fixed cylinder; 16, air suction hose; 17, negative pressure suction disc; 18, support; 181, upper moving cylinder; 182, lower fixed cylinder; 183, return spring; 184, universal shaft; 19, oil tank; 20, oil pipeline; 21, rotating containing pipe; 22, extending moving rod; 23, rotating shaft. DETAILED DESCRIPTION

[0020] Please refer to Figures 1-9 The present application provides the following technical solutions: a device for monitoring underground ground pressure in mine exploitation.

[0021] Embodiment one: in order to solve the problem that the monitoring device needs to ensure the stability of the force when it is installed in the interior of the mine, the top of the monitoring device is contacted with the top of the mine, but in the process of mining, the top of the mine cannot be guaranteed to be flat, at this time, the force point of the monitoring device is easy to tilt, and thus the problem of inaccurate monitoring data occurs in the later period, please refer to the accompanying drawings Figure 1 , the accompanying drawings Figure 2 , the accompanying drawings Figure 5 , the accompanying drawings Figure 8 , and the accompanying drawings Figure 9The system includes a base 1, a first threaded rod 2 rotatably mounted on the top of the base 1, the top of the first threaded rod 2 being threadedly connected to the inside of a rotating sleeve 3, a connecting frame 8 rotatably mounted on the top of the rotating sleeve 3, and a bearing frame 9 integrally mounted on the connecting frame 8; a bonding disc 10 is slidably mounted on the outside of the connecting frame 8 and the bearing frame 9, and a flexible support mechanism is provided on the inside of the bonding disc 10 and the bearing frame 9; the flexible support mechanism includes a support member 18 installed on the inside of the bonding disc 10 and the bearing frame 9, an oil tank 19 is connected to one side of the bottom of the support member 18 via a pipe, an oil delivery pipe 20 is connected to the bottom of the oil tank 19, the outer end of the oil delivery pipe 20 is connected to the bottom end of a rotating receiving pipe 21, and an extension moving rod 22 is slidably and sealed at the other end of the rotating receiving pipe 21, with a rotating shaft 23 rotatably mounted on the top of the extension moving rod 22; the rotating shaft 23... 3. The outer side is fixed to the bottom outer wall of the bonding plate 10; the rotating receiving tube 21 and the extension moving rod 22 are provided with a reset element, which is a connecting spring; the support member 18 includes an upper moving cylinder 181, the bottom end of the upper moving cylinder 181 is sealed and slidably disposed inside the lower fixed cylinder 182, and a reset spring 183 is disposed between the upper moving cylinder 181 and the lower fixed cylinder 182; universal joints 184 are provided on the outer side of both the upper moving cylinder 181 and the lower fixed cylinder 182, and the outer sides of the two sets of universal joints 184 are respectively rotatably disposed on the inner side of the bonding plate 10 and the top of the support frame 9; the support member 18 is provided with several sets at equal angles about the center position of the support frame 9; the elastic force of the reset spring 183 is greater than the elastic force of the reset element; a piston is provided at the bottom end of the upper moving cylinder 181, and hydraulic oil is disposed between the piston and the lower fixed cylinder 182.

[0022] First, place the base 1 in a stable position at the bottom of the mine. Rotate the first threaded rod 2. Since the first threaded rod 2 is threadedly connected to the rotating sleeve 3, the height of the rotating sleeve 3 can be adjusted, thereby driving the connecting frame 8 and the integrated bearing frame 9 to rise and fall synchronously, so that the negative pressure suction cup 17 on the top of the bonding plate 10 initially approaches the support plate at the top of the mine. When the bonding plate 10 contacts the irregular top of the mine, the uneven force on different positions of the bonding plate 10 will cause slight displacement. At this time, the support member 18 connected to the inner side of the bonding plate 10 through the universal joint 184 starts to function: the upper moving cylinder 181 slides and seals within the lower fixed cylinder 182 as the bonding plate 10 shifts. The piston squeezes or releases the hydraulic oil in the lower fixed cylinder 182, and the hydraulic oil flows through the pipeline. The oil enters the oil tank 19 and is then distributed to the rotating receiving pipe 21 through the oil delivery pipe 20. The hydraulic oil in the rotating receiving pipe 21 pushes the extension moving rod 22 to slide. The top of the extension moving rod 22 is adapted to the angle change of the bottom of the bonding plate 10 through the rotating shaft 23. At the same time, the return spring 183 between the upper moving cylinder 181 and the lower fixed cylinder 182 has a spring force greater than that of the return element, thus providing a reverse buffer force. Combined with the auxiliary adjustment of the return element in the extension moving rod 22, a balanced stress is applied to the lower end of the bonding plate 10 to counteract its tilting tendency caused by the unevenness of the top, ensuring the stability of the bonding plate 10 and the overall device under force, and providing a reliable structural foundation for the monitoring of the stress sensor 6.

[0023] Embodiment two: in order to facilitate the adjustment of the position of the stress sensor 6, please refer to the attached Figure 1 -attached Figure 3 , the rotating sleeve 3 and the base 1 are provided with an adjusting mechanism, and the adjusting mechanism is provided with a stress sensor 6, and the outer side of the stress sensor 6 is attached to the outer wall of the mine sidewall support plate; the adjusting mechanism comprises a second rotating rod 5 rotatably arranged at the top edge of the base 1, and a first rotating rod 4 rotatably arranged at the lower edge of the rotating sleeve 3, the first rotating rod 4 and the second rotating rod 5 are hingedly connected, and the first rotating rod 4 and the second rotating rod 5 are internally and commonly provided with a guide groove 7, and the stress sensor 6 is installed in the guide groove 7; one side of the stress sensor 6 is fixedly provided with a first gasket 61, and the center of the first gasket 61 is fixedly provided with a screw rod 62, and the side away from the first gasket 61 of the screw rod 62 is threadedly connected with a locking bolt 63.

[0024] The adjusting mechanism between the rotating sleeve 3 and the base 1 provides support for the position adjustment of the stress sensor 6, one end of the first rotating rod 4 is rotatably connected to the lower edge of the rotating sleeve 3, and the other end is hingedly connected with the second rotating rod 5 rotatably connected with the top edge of the base 1, by bending the hinge between the first rotating rod 4 and the second rotating rod 5, the included angle between the two can be changed; because the first rotating rod 4 and the second rotating rod 5 are internally and commonly provided with a guide groove 7, and the stress sensor 6 is installed in the guide groove 7, when the included angle between the two changes, the stress sensor 6 can move along the guide groove 7, and then adjust its attached position on the sidewall of the mine; when the stress sensor 6 moves to the target position, the screw rod 62 at the center of the first gasket 61 on one side of the stress sensor 6 is used to pass through the corresponding hole position of the guide groove 7, and then the locking bolt 63 at the other end of the screw rod 62 is tightened, the stress sensor 6 is fixed in the guide groove 7 through the clamping action of the first gasket 61 and the locking bolt 63, and the stress sensor 6 is stably attached to the sidewall support plate of the mine, realizing flexible adjustment and fixation of the monitoring position.

[0025] Embodiment three: in order to facilitate the stable placement of the device inside the mine, please refer to the attached Figure 1 , attached Figure 2 and attached Figure 4 -attached Figure 6The second threaded rod 11 fixed on the top of the rotating sleeve 3 penetrates the inside of the bearing frame 9, a negative pressure suction mechanism is connected to the second threaded rod 11, a negative pressure suction disc 17 is communicated with the negative pressure suction mechanism, the negative pressure suction disc 17 is installed on the top of the adhering disc 10, and the outside of the top of the negative pressure suction disc 17 is attached to the outer wall of the mine top supporting plate; the negative pressure suction mechanism comprises a threaded connection cylinder 12 which is screwed on the top of the second threaded rod 11, a piston block 13 is fixed on the outside of the top of the threaded connection cylinder 12, a square groove 14 is slidably arranged on the outside of the piston block 13, the square groove 14 is arranged in the inside of a fixed cylinder 15, and the fixed cylinder 15 is communicated with the negative pressure suction disc 17 through an air suction hose 16; the number of threads of the second threaded rod 11 is the same as that of the first threaded rod 2, and the thread direction of the second threaded rod 11 is opposite to that of the first threaded rod 2; a rubber ring is nested on the outside of the piston block 13, and the rubber ring is attached to the inner wall of the square groove 14; the threaded connection cylinder 12 is fixed on the top of the bearing frame 9 through a support on the outside of the top of the threaded connection cylinder 12.

[0026] The second threaded rod 11 fixed on the top of the rotating sleeve 3 penetrates the inside of the bearing frame 9, a negative pressure suction mechanism is connected to the second threaded rod 11, a negative pressure suction disc 17 is communicated with the negative pressure suction mechanism, the negative pressure suction disc 17 is installed on the top of the adhering disc 10, and the outside of the top of the negative pressure suction disc 17 is attached to the outer wall of the mine top supporting plate; the negative pressure suction mechanism comprises a threaded connection cylinder 12 which is screwed on the top of the second threaded rod 11, a piston block 13 is fixed on the outside of the top of the threaded connection cylinder 12, a square groove 14 is slidably arranged on the outside of the piston block 13, the square groove 14 is arranged in the inside of a fixed cylinder 15, and the fixed cylinder 15 is communicated with the negative pressure suction disc 17 through an air suction hose 16; the number of threads of the second threaded rod 11 is the same as that of the first threaded rod 2, and the thread direction of the second threaded rod 11 is opposite to that of the first threaded rod 2; a rubber ring is nested on the outside of the piston block 13, and the rubber ring is attached to the inner wall of the square groove 14; the threaded connection cylinder 12 is fixed on the top of the bearing frame 9 through a support on the outside of the top of the threaded connection cylinder 12. The second threaded rod 11 fixed on the top of the rotating sleeve 3 penetrates the inside of the bearing frame 9, a negative pressure suction mechanism is connected to the second threaded rod 11, a negative pressure suction disc 17 is communicated with the negative pressure suction mechanism, the negative pressure suction disc 17 is installed on the top of the adhering disc 10, and the outside of the top of the negative pressure suction disc 17 is attached to the outer wall of the mine top supporting plate; the negative pressure suction mechanism comprises a threaded connection cylinder 12 which is screwed on the top of the second threaded rod 11, a piston block 13 is fixed on the outside of the top of the threaded connection cylinder 12, a square groove 14 is slidably arranged on the outside of the piston block 13, the square groove 14 is arranged in the inside of a fixed cylinder 15, and the fixed cylinder 15 is communicated with the negative pressure suction disc 17 through an air suction hose 16; the number of threads of the second threaded rod 11 is the same as that of the first threaded rod 2, and the thread direction of the second threaded rod 11 is opposite to that of the first threaded rod 2; a rubber ring is nested on the outside of the piston block 13, and the rubber ring is attached to the inner wall of the square groove 14; the threaded connection cylinder 12 is fixed on the top of the bearing frame 9 through a support on the outside of the top of the threaded connection cylinder 12.

Claims

1. A ground pressure monitoring device for underground mining operations, comprising a base (1), wherein a first threaded rod (2) is rotatably mounted on the top of the base (1), the top of the first threaded rod (2) is threadedly connected to the inside of a rotating sleeve (3), and a connecting frame (8) is rotatably mounted on the top of the rotating sleeve (3), wherein a bearing frame (9) is integrally mounted on the connecting frame (8); characterized in that: An adjustment mechanism is provided between the rotating sleeve (3) and the base (1). A stress sensor (6) is provided on the adjustment mechanism. The outer side of the stress sensor (6) is attached to the outer wall of the mine sidewall support plate. A second threaded rod (11) is fixed on the top of the rotating sleeve (3). The outer side of the second threaded rod (11) rotates through the inside of the support frame (9). A negative pressure adsorption mechanism is connected to the second threaded rod (11). A negative pressure suction cup (17) is connected to the negative pressure adsorption mechanism. The negative pressure suction cup (17) is installed on the top of the bonding plate (10). The outer side of the top of the negative pressure suction cup (17) is attached to the outer wall of the mine top support plate. The outer side of the bonding plate (10) is slidably disposed on the outside of the connecting frame (8) and the support frame (9). A flexible support mechanism is provided on the inner side of the bonding plate (10) and the support frame (9).

2. The underground ground pressure monitoring device for mining operations according to claim 1, characterized in that: The adjustment mechanism includes a second rotating rod (5) rotatably disposed on the top edge of the base (1), and a first rotating rod (4) rotatably disposed on the lower edge of the rotating sleeve (3). The first rotating rod (4) and the second rotating rod (5) are hinged together. The first rotating rod (4) and the second rotating rod (5) are provided with a guide groove (7) through their interiors. The stress sensor (6) is installed inside the guide groove (7).

3. The underground ground pressure monitoring device for mining operations according to claim 2, characterized in that: The stress sensor (6) has a first gasket (61) fixed on one side, and a screw (62) is fixed at the center of the first gasket (61). A locking bolt (63) is threaded onto the side of the screw (62) away from the first gasket (61).

4. The underground ground pressure monitoring device for mining operations according to claim 1, characterized in that: The negative pressure adsorption mechanism includes a threaded connecting cylinder (12) threaded to the top of the second threaded rod (11). A piston block (13) is fixed on the outer side of the top of the threaded connecting cylinder (12). A square groove (14) is slidably provided on the outer side of the piston block (13). The square groove (14) is opened inside the fixed cylinder (15). The top of the fixed cylinder (15) is connected to the negative pressure suction cup (17) through the suction hose (16).

5. A ground pressure monitoring device for underground mining operations according to claim 4, characterized in that: The number of thread turns of the second threaded rod (11) is the same as that of the first threaded rod (2), and the thread direction of the second threaded rod (11) is opposite to that of the first threaded rod (2).

6. The underground ground pressure monitoring device for mining operations according to claim 4, characterized in that: The piston block (13) has a rubber ring nested on its outer side, and the outer side of the rubber ring is attached to the inner wall of the square groove (14); the top outer side of the threaded connecting cylinder (12) is fixed to the top of the support frame (9) by a bracket.

7. The underground ground pressure monitoring device for mining operations according to claim 1, characterized in that: The flexible support mechanism includes a support member (18) installed inside the bonding plate (10) and the support frame (9). One side of the bottom of the support member (18) is connected to an oil tank (19) through a pipe. The bottom end of the oil tank (19) is connected to an oil delivery pipe (20). The outer end of the oil delivery pipe (20) is connected to the bottom end of the rotating receiving pipe (21). The other end of the rotating receiving pipe (21) is provided with a sealing sliding extension moving rod (22). The top of the extension moving rod (22) is rotatably provided with a rotating shaft (23).

8. A ground pressure monitoring device for underground mining operations according to claim 7, characterized in that: The rotating shaft (23) is fixed to the outer wall of the bottom of the fitting plate (10); the rotating receiving tube (21) and the extension moving rod (22) are provided with a reset element, which is a connecting spring.

9. A ground pressure monitoring device for underground mining operations according to claim 7, characterized in that: The support member (18) includes an upper movable cylinder (181), the bottom end of which is sealed and slidably disposed inside the lower fixed cylinder (182), and a return spring (183) is disposed between the upper movable cylinder (181) and the lower fixed cylinder (182); a universal joint (184) is disposed on the outer side of both the upper movable cylinder (181) and the lower fixed cylinder (182), and the outer sides of the two sets of universal joints (184) are respectively rotatably disposed on the inner side of the bonding plate (10) and the top of the support frame (9).

10. A ground pressure monitoring device for underground mining operations according to claim 9, characterized in that: The support member (18) is provided with several sets of angles at the center position of the bearing frame (9); the elastic force of the reset spring (183) is greater than the elastic force of the reset element; a piston is provided at the bottom end of the upper moving cylinder (181), and hydraulic oil is provided between the piston and the lower fixed cylinder (182).

Images