Coal mine stress on-line monitoring device

Abstract

The application discloses a kind of coal mine stress on-line monitoring device, including installation cylinder, rotating cylinder, motor, arc plate, top rod and adjusting assembly, the rotating cylinder is rotatably covered in the installation cylinder, the outer circumferential surface of the rotating cylinder is equipped with helical blade spirally around along its axial direction, the motor drives the rotating cylinder rotation, stress meter is equipped between the arc plate and the top rod, the adjusting assembly is used to adjust the position of the top rod in the radial direction of the installation cylinder.The application can quickly send the device into and take out the drill hole, improve the work efficiency, reduce the need of manual direct operation, reduce labor intensity and safety risk.Stress meter is directly installed between arc plate and top rod, can accurately monitor the change of ground stress, improve the accuracy of monitoring data.The coal mine stress on-line monitoring device of the embodiment of the application allows it to be used in drill holes of different depths and different conditions, with strong adaptability.

Description

Technical Field

[0001] This invention relates to the field of coal mine rockburst detection technology, specifically to an online stress monitoring device for coal mines. Background Technology

[0002] During coal mine production, the movement of underground rock strata and mining activities cause continuous changes in ground stress. These changes directly affect the safe production of coal mines. Excessive ground stress can lead to disasters such as roadway deformation, roof collapse, and even serious accidents like rock bursts and gas outbursts. Therefore, real-time monitoring of changes in coal mine ground stress is of great significance for preventing and controlling coal mine disasters, ensuring the safety of miners, and maintaining the stable operation of the mine.

[0003] In related technologies, coal mine stress monitoring devices mainly include those using mechanical force gauges and resistance strain gauges to measure ground stress. However, these monitoring devices suffer from difficulties in installation and removal, resulting in low efficiency. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose an online stress monitoring device for coal mines.

[0006] The online stress monitoring device for coal mines according to this invention includes an installation cylinder, a rotating cylinder, a motor, an arc-shaped plate, a top rod, and an adjustment assembly. The installation cylinder has an installation cavity, and the cylinder wall of the installation cylinder has a clearance hole. The rotating cylinder is rotatably sleeved on the installation cylinder, and the outer circumferential surface of the rotating cylinder is provided with helical blades spirally surrounding it along its axial direction. The motor is located in the installation cavity and connected to the rotating cylinder to drive the rotating cylinder to rotate. The arc-shaped plate is located on the outer circumferential surface of the installation cylinder and is adapted to the outer circumferential surface of the installation cylinder. One end of the top rod is connected to the arc-shaped plate, and the other end of the top rod extends into the installation cavity through the clearance hole. A stress gauge is provided between the arc-shaped plate and the top rod. The adjustment assembly is located in the installation cavity and connected to the top rod, and is used to adjust the radial position of the top rod in the installation cylinder.

[0007] In some embodiments, the output shaft of the motor is provided with a gear located outside the mounting cylinder, and the inner circumferential surface of the rotating cylinder is provided with an internal gear ring, which meshes with the gear.

[0008] In some embodiments, the online stress monitoring device for coal mines according to the present invention includes a first bearing and a second bearing, the first bearing and the second bearing being axially spaced on the mounting cylinder, and the rotating cylinder being mounted on the first bearing and the second bearing.

[0009] In some embodiments, the rotating cylinder has a conical portion at one end away from the arc-shaped plate along the axial direction of the mounting cylinder, and the cross-sectional area of ​​the conical portion gradually decreases in the direction away from the arc-shaped plate.

[0010] In some embodiments, the adjusting assembly includes a cylinder, an air inlet pipe, and an exhaust pipe. The cylinder is disposed within the mounting cavity and has an inflation chamber and a groove communicating with the inflation chamber. The push rod is slidably engaged with the groove along the radial direction of the mounting cylinder. The air inlet pipe and the exhaust pipe are disposed on the cylinder and communicate with the inflation chamber. The air inlet pipe is used to inflate the inflation chamber to push the push rod outward from the mounting cylinder. The exhaust pipe is used to discharge the gas in the inflation chamber to move the push rod inward into the mounting cylinder.

[0011] In some embodiments, a pressure sensor is provided in the inflation chamber to monitor the gas pressure inside the inflation chamber.

[0012] In some embodiments, the intake pipe is provided with a first solenoid valve, which is used to control the opening and closing of the intake pipe, and the exhaust pipe is provided with a second solenoid valve, which is used to control the opening and closing of the exhaust pipe.

[0013] In some embodiments, an elastic sheet is provided on the outer peripheral surface of the arc-shaped plate.

[0014] In some embodiments, the number of the arc-shaped plates is at least three, and the at least three arc-shaped plates are arranged at circumferential intervals along the mounting cylinder.

[0015] In some embodiments, a balance plate is provided on the outer peripheral surface of the mounting cylinder, and the balance plate is arranged perpendicular to the axial direction of the mounting cylinder.

[0016] During installation, the online stress monitoring device for coal mines according to this invention is placed into a predetermined borehole in the coal mine. The motor is started and rotated forward, driving the rotating cylinder and its helical blades to rotate. The rotating helical blades propel the device forward in the borehole until a preset depth is reached. Once the device reaches the preset depth, the adjusting component controls the push rod to move outward. The movement of the push rod causes the arc-shaped plate to press tightly against the inner wall of the borehole. The stress gauge between the arc-shaped plate and the push rod begins to operate, monitoring changes in ground stress in real time. After monitoring is completed, the adjusting component controls the push rod to move inward, separating the arc-shaped plate from the inner wall of the borehole. The motor is then started in reverse, driving the rotating cylinder and its helical blades to rotate in reverse, thereby removing the device from the borehole.

[0017] The online stress monitoring device for coal mines in this embodiment of the invention utilizes a rotating propulsion method with helical blades, enabling rapid insertion and removal of the device from the borehole, thus improving work efficiency. Automatic control of the motor and adjustment components reduces the need for direct manual operation, lowering labor intensity and safety risks. The stress gauge is directly installed between the arc-shaped plate and the top rod, accurately monitoring changes in ground stress and improving the accuracy of the monitoring data. This online stress monitoring device for coal mines allows for use in boreholes of varying depths and conditions, demonstrating strong adaptability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the installation of the online stress monitoring device for coal mines according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the online stress monitoring device for coal mines according to an embodiment of the present invention.

[0020] Figure 3 This is a front view of the online stress monitoring device for coal mines according to an embodiment of the present invention.

[0021] Figure 4 This is a cross-sectional view of the online stress monitoring device for coal mines according to an embodiment of the present invention.

[0022] Figure 5 yes Figure 3 Sectional view of AA.

[0023] Figure 6 yes Figure 3 A cross-sectional view of BB.

[0024] 100. Coal Mine Stress Online Monitoring Device; 1. Mounting Cylinder; 101. Mounting Chamber; 2. Rotating Cylinder; 3. Helical Blade; 4. Motor; 5. Arc Plate; 6. Top Rod; 7. Stress Gauge; 8. Gear; 9. Internal Gear Ring; 10. First Bearing; 11. Second Bearing; 12. Conical Part; 13. Cylinder; 1301. Air Inlet Chamber; 1302. Slide Groove; 14. Air Inlet Pipe; 15. Exhaust Pipe; 17. First Solenoid Valve; 18. Second Solenoid Valve; 19. Elastic Sheet; 20. Balance Plate. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] like Figures 1 to 6As shown, the online stress monitoring device 100 for coal mines according to an embodiment of the present invention includes an installation cylinder 1, a rotating cylinder 2, a motor 4, an arc-shaped plate 5, a top rod 6, and an adjustment assembly. The installation cylinder 1 has an installation cavity 101, and a clearance hole is provided on the cylinder wall of the installation cylinder 1. The rotating cylinder 2 is rotatably fitted onto the installation cylinder 1, and a helical blade 3 is provided on the outer circumferential surface of the rotating cylinder 2, spirally wound along its axial direction. The motor 4 is located inside the installation cavity 101 and connected to the rotating cylinder 2 to drive the rotating cylinder 2 to rotate. The arc-shaped plate 5 is located on the outer circumferential surface of the installation cylinder 1 and is adapted to fit the outer circumferential surface of the installation cylinder 1. One end of the top rod 6 is connected to the arc-shaped plate 5, and the other end of the top rod 6 extends into the installation cavity 101 through the clearance hole. A stress gauge 7 is provided between the arc-shaped plate 5 and the top rod 6. The adjustment assembly is located inside the installation cavity 101 and connected to the top rod 6, and is used to adjust the radial position of the top rod 6 in the installation cylinder 1.

[0027] During installation, the online stress monitoring device 100 for coal mines in this embodiment of the invention is placed into a predetermined borehole in the coal mine. The motor 4 is started and rotated forward, driving the rotating cylinder 2 and its helical blades 3 to rotate. The rotating propulsion device of the helical blades 3 advances through the borehole until a preset depth is reached. Once the device reaches the preset depth, the adjusting component controls the push rod 6 to move outward. The movement of the push rod 6 causes the arc-shaped plate 5 to press tightly against the inner wall of the borehole. The stress gauge 7 between the arc-shaped plate 5 and the push rod 6 begins to operate, monitoring changes in ground stress in real time. After monitoring is completed, the adjusting component controls the push rod 6 to move inward, separating the arc-shaped plate 5 from the inner wall of the borehole. The motor 4 is then started in reverse, driving the rotating cylinder 2 and its helical blades 3 to reverse, thereby removing the device from the borehole.

[0028] The online stress monitoring device 100 for coal mines in this embodiment of the invention utilizes the rotational propulsion of the helical blades 3 to quickly insert and remove the device from the borehole, improving work efficiency. Automatic control via the motor 4 and adjustment components reduces the need for direct manual operation, lowering labor intensity and safety risks. The stress gauge 7, directly installed between the arc-shaped plate 5 and the top rod 6, accurately monitors changes in ground stress, improving the accuracy of monitoring data. The online stress monitoring device 100 for coal mines in this embodiment of the invention allows for use in boreholes of different depths and under different conditions, demonstrating strong adaptability.

[0029] In some embodiments, such as Figure 4 and Figure 6 As shown, the output shaft of the motor 4 is provided with a gear 8 located outside the mounting cylinder 1, and the inner circumferential surface of the rotating cylinder 2 is provided with an internal gear ring 9, which meshes with the gear 8.

[0030] The gear 8 on the output shaft of motor 4 meshes with the internal gear ring 9 on the inner circumference of the rotating cylinder 2. This gear 8 transmission method provides more stable and precise power transmission. Through the meshing of gear 8 and internal gear ring 9, the rotational motion of motor 4 can be efficiently converted into the rotational motion of rotating cylinder 2. The meshing of gear 8 and internal gear ring 9 reduces energy loss, improves the overall rotational efficiency of the device, and avoids energy waste due to friction or slippage, thus enabling motor 4 to drive rotating cylinder 2 more effectively. The meshing transmission of gear 8 and internal gear ring 9 provides precise rotational control, which is crucial for accurately delivering the device to the predetermined position. By controlling the speed and rotation angle of motor 4, the movement of rotating cylinder 2 can be controlled more precisely.

[0031] In some embodiments, such as Figure 4 As shown, the online coal mine stress monitoring device 100 of this embodiment includes a first bearing 10 and a second bearing 11. The first bearing 10 and the second bearing 11 are mounted on the mounting cylinder 1 at intervals along the axial direction of the mounting cylinder 1, and the rotating cylinder 2 is mounted on the first bearing 10 and the second bearing 11.

[0032] The first bearing 10 and the second bearing 11 provide axial and radial support for the rotating cylinder 2, ensuring its stability during rotation. The bearings reduce direct contact between the rotating cylinder 2 and the mounting cylinder 1, lowering friction and improving rotational efficiency. The use of bearings significantly reduces wear between the rotating cylinder 2 and the mounting cylinder 1, extending the device's service life. Simultaneously, the rolling friction of the bearings replaces sliding friction, reducing noise and vibration and improving the comfort of the working environment. The bearings maintain the rotational accuracy of the rotating cylinder 2, avoiding measurement errors caused by radial runout or axial movement.

[0033] In some embodiments, such as Figures 2 to 4 As shown, the rotating cylinder 2 has a conical part 12 at one end away from the arc plate 5 along the axial direction of the mounting cylinder 1, and the cross-sectional area of ​​the conical part 12 gradually decreases along the direction away from the arc plate 5.

[0034] The conical portion 12 serves as a guide during device installation and removal, facilitating the smooth entry and exit of the rotating cylinder 2 from the borehole. When the device enters the borehole, the conical portion 12 reduces friction with the borehole wall, preventing jamming due to excessive friction. The gradually decreasing cross-sectional area of ​​the conical portion 12 helps reduce resistance from the surrounding rock and soil as the device advances, thereby reducing the power required for propulsion.

[0035] In some embodiments, such as Figure 4 and Figure 5As shown, the adjustment assembly includes a cylinder 13, an air inlet pipe 14, and an exhaust pipe 15. The cylinder 13 is disposed within the mounting cavity 101, and has an inflation chamber 1301 and a groove 1302 communicating with the inflation chamber 1301. The push rod 6 is slidably engaged with the groove 1302 along the radial direction of the mounting cylinder 1. The air inlet pipe 14 and the exhaust pipe 15 are disposed on the cylinder 13 and communicate with the inflation chamber 1301. The air inlet pipe 14 is used to inflate the inflation chamber 1301 to push the push rod 6 outward from the mounting cylinder 1. The exhaust pipe 15 is used to expel the gas from the inflation chamber 1301 to allow the push rod 6 to move inward into the mounting cylinder 1.

[0036] Specifically, the air inlet pipe 14 is connected to the inflation chamber 1301 of the cylinder 13 for inflating the inflation chamber 1301 with air. The air pressure pushes the push rod 6 outward, allowing the arc plate 5 to abut against the inner wall of the borehole. The exhaust pipe 15 is used to expel the gas from the inflation chamber 1301, reducing the air pressure, thereby allowing the push rod 6 to move inward for easy removal of the device.

[0037] By controlling the air inlet pipe 14 and the exhaust pipe 15, the position of the top rod 6 can be precisely adjusted to ensure that the arc-shaped plate 5 accurately contacts the borehole inner wall, thereby achieving reliable stress monitoring. This adjustment mechanism provides greater operational flexibility, allowing for rapid adjustment of the top rod 6 position under different working conditions. The inflation and deflation processes can be remotely controlled, simplifying the operation process and reducing the labor intensity of miners. By adjusting the position of the top rod 6, the device can adapt to boreholes of different diameters and conditions, increasing its applicability. The rapid adjustment mechanism of the top rod 6 improves the efficiency of installing and removing the monitoring device, thereby reducing the impact on mine production. Remote control of the inflation and deflation processes reduces direct contact between miners and equipment, improving operational safety.

[0038] In some embodiments, a pressure sensor is provided in the inflation chamber 1301 to monitor the gas pressure inside the inflation chamber 1301.

[0039] A pressure sensor monitors the gas pressure inside the inflation chamber 1301 in real time to ensure that the pressure remains within a predetermined safe range. This allows for precise control of the pressure within the inflation chamber 1301, which in turn precisely controls the movement of the push rod 6. The data provided by the pressure sensor can be used in the feedback control system to automatically adjust the operation of the intake pipe 14 and the exhaust pipe 15 to maintain or change the pressure.

[0040] By monitoring air pressure in real time, the movement of the push rod 6 can be synchronized with changes in air pressure, thereby improving the accuracy of the contact between the arc plate 5 and the inner wall of the borehole and ensuring the accuracy of stress monitoring data. Pressure sensors can help avoid equipment damage or operational risks caused by excessive air pressure, improving system safety. Data from pressure sensors can be used in automated control systems, enabling unmanned or minimally manned operation, reducing operating costs, and minimizing human error. When the air pressure exceeds the safe range, the pressure sensor can trigger an alarm system, promptly reminding operators to take appropriate measures. By monitoring air pressure data, potential equipment problems can be predicted and detected, allowing for proactive maintenance and preventing sudden malfunctions from impacting production.

[0041] In some embodiments, such as Figure 4 As shown, the intake pipe 14 is equipped with a first solenoid valve 17, which is used to control the opening and closing of the intake pipe 14, and the exhaust pipe 15 is equipped with a second solenoid valve 18, which is used to control the opening and closing of the exhaust pipe 15.

[0042] The first solenoid valve 17 controls the opening and closing of the air inlet pipe 14. When it is necessary to inflate the air chamber 1301, the first solenoid valve 17 opens, allowing gas to enter the air chamber 1301. The second solenoid valve 18 controls the opening and closing of the exhaust pipe 15. When it is necessary to expel gas from the air chamber 1301, the second solenoid valve 18 opens, allowing gas to be expelled. By controlling the opening and closing of the solenoid valves, the air pressure in the air chamber 1301 can be precisely adjusted, thereby controlling the movement of the push rod 6.

[0043] The rapid response and precise control capabilities of the solenoid valve enable more accurate air pressure regulation, thereby improving the adjustment accuracy of the push rod at position 6. The solenoid valve can be remotely controlled, making operation more flexible and adaptable to different working environments and needs. The solenoid valve's control provides a rapid response; when an abnormality is detected, it can quickly cut off the air supply to avoid the dangers caused by excessive air pressure. The solenoid valve can be integrated into automatic control systems, enabling unmanned or minimally manned operation and improving work efficiency. The automatic control of the solenoid valve reduces the number of manual interventions and lowers operational risks. The automatic control of the solenoid valve helps to promptly identify and resolve problems, improving equipment maintenance efficiency.

[0044] In some embodiments, such as Figure 4 and Figure 5 As shown, an elastic sheet 19 is provided on the outer peripheral surface of the arc plate 5.

[0045] The elastic plate 19 possesses good elasticity and deformation capacity. When the arc-shaped plate 5 abuts against the inner wall of the borehole, the elastic plate 19 can adapt to borehole walls of different diameters and shapes, providing a better contact effect. The presence of the elastic plate 19 increases the contact area between the arc-shaped plate 5 and the inner wall of the borehole, thereby improving the accuracy and reliability of stress monitoring. The elastic plate 19 can absorb the impact and vibration caused by underground rock movement or mining activities, protecting the stress gauge 7 and other internal components from damage.

[0046] Therefore, the presence of the elastic plate 19 ensures good contact between the arc-shaped plate 5 and the inner wall of the borehole, improving the accuracy of stress monitoring data. The elastic plate 19 allows the device to adapt to boreholes of different diameters and shapes, increasing the applicability of the monitoring device. The elastic plate 19 can absorb shocks and vibrations, protecting internal components and improving the overall safety of the device. The presence of the elastic plate 19 reduces wear on internal components, extending the service life of the device. Because the elastic plate 19 reduces wear on internal components, maintenance becomes simpler, reducing maintenance costs.

[0047] Optionally, such as Figure 2 and Figure 5 As shown, the number of arc-shaped plates 5 is at least three, and the at least three arc-shaped plates 5 are arranged at intervals along the circumference of the mounting cylinder 1.

[0048] At least three arc-shaped plates 5 are arranged at circumferential intervals along the mounting cylinder 1. This ensures that the arc-shaped plates 5 can evenly abut against the inner wall of the borehole during installation, providing stable support. The arrangement of multiple arc-shaped plates 5 provides multi-point support, increasing the stability of the support and reducing errors caused by uneven support. The circumferentially spaced arrangement of the arc-shaped plates 5 allows the device to better adapt to boreholes of different diameters, improving the adaptability of the device.

[0049] Therefore, the uniform support of multiple arc-shaped plates 5 ensures the stability of the monitoring device on the borehole wall, thereby improving the accuracy of the monitoring data. The multi-point support design increases the stability of the device, maintaining good working condition even under conditions of underground rock movement. Stable support reduces the movement of the device within the borehole, lowering the safety risks caused by unstable support. The circumferentially spaced arrangement of the arc-shaped plates 5 allows the device to better adapt to complex underground environments, improving its applicability. Stable support reduces wear on internal components, extending the service life of the device.

[0050] In some embodiments, such as Figure 2 and Figure 5 As shown, a balance plate 20 is provided on the outer circumferential surface of the mounting cylinder 1, and the balance plate 20 is arranged perpendicular to the axial direction of the mounting cylinder 1.

[0051] The balance plate 20 is set perpendicular to the axial direction of the mounting cylinder 1, which can provide an additional support point to help balance the position of the device in the borehole. It also prevents the device from tilting and swinging in the borehole during forward and backward movement, and prevents the mounting cylinder 1 from slipping, which would prevent the device from moving forward or backward. This improves the stability and reliability of the device.

[0052] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

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

Claims

1. A coal mine stress online monitoring device, characterized in that, include: Mounting cylinder (1), the mounting cylinder (1) has a mounting cavity (101), and the cylinder wall of the mounting cylinder (1) has a clearance hole; Rotating cylinder (2), which is rotatably sleeved on the mounting cylinder (1), and the outer circumferential surface of the rotating cylinder (2) is provided with spiral blades (3) spirally surrounding it along its axial direction. Motor (4), the motor (4) is located in the mounting cavity (101) and connected to the rotating cylinder (2) to drive the rotating cylinder (2) to rotate; An arc-shaped plate (5) and a top rod (6) are provided on the outer circumferential surface of the mounting cylinder (1) and are adapted to the outer circumferential surface of the mounting cylinder (1). One end of the top rod (6) is connected to the arc-shaped plate (5), and the other end of the top rod (6) extends into the mounting cavity (101) through the clearance hole. A stress gauge (7) is provided between the arc-shaped plate (5) and the top rod (6). An adjustment assembly is provided inside the mounting cavity (101) and connected to the push rod (6) for adjusting the position of the push rod (6) in the radial direction of the mounting cylinder (1).

2. The online stress monitoring device for coal mines according to claim 1, characterized in that, The output shaft of the motor (4) is provided with a gear (8) located outside the mounting cylinder (1), and the inner circumferential surface of the rotating cylinder (2) is provided with an internal gear ring (9), which meshes with the gear (8).

3. The online stress monitoring device for coal mines according to claim 1, characterized in that, It includes a first bearing (10) and a second bearing (11), the first bearing (10) and the second bearing (11) being fitted onto the mounting cylinder (1) at an axial interval, and the rotating cylinder (2) being fitted onto the first bearing (10) and the second bearing (11).

4. The online stress monitoring device for coal mines according to claim 1, characterized in that, The rotating cylinder (2) has a conical part (12) at one end away from the arc plate (5) along the axial direction of the mounting cylinder (1), and the cross-sectional area of ​​the conical part (12) gradually decreases in the direction away from the arc plate (5).

5. The online stress monitoring device for coal mines according to claim 1, characterized in that, The adjustment assembly includes a cylinder (13), an air inlet pipe (14), and an exhaust pipe (15). The cylinder (13) is disposed in the mounting cavity (101). The cylinder (13) has an inflation cavity (1301) and a groove (1302) communicating with the inflation cavity (1301). The push rod (6) is slidably engaged with the groove (1302) along the radial direction of the mounting cylinder (1). The air inlet pipe (14) and the exhaust pipe (15) are disposed on the cylinder (13) and communicate with the inflation cavity (1301). The air inlet pipe (14) is used to inflate the inflation cavity (1301) to push the push rod (6) to move out of the mounting cylinder (1). The exhaust pipe (15) is used to discharge the gas in the inflation cavity (1301) to move the push rod (6) into the mounting cylinder (1).

6. The online stress monitoring device for coal mines according to claim 5, characterized in that, A pressure sensor is provided inside the inflation chamber (1301) to monitor the gas pressure inside the inflation chamber (1301).

7. The online stress monitoring device for coal mines according to claim 5, characterized in that, The intake pipe (14) is provided with a first solenoid valve (17), which is used to control the opening and closing of the intake pipe (14). The exhaust pipe (15) is provided with a second solenoid valve (18), which is used to control the opening and closing of the exhaust pipe (15).

8. The online stress monitoring device for coal mines according to claim 1, characterized in that, An elastic sheet (19) is provided on the outer peripheral surface of the arc plate (5).

9. The online stress monitoring device for coal mines according to claim 1, characterized in that, The number of the arc-shaped plates (5) is at least three, and the at least three arc-shaped plates (5) are arranged at circumferential intervals along the mounting cylinder (1).

10. The online stress monitoring device for coal mines according to claim 1, characterized in that, The mounting cylinder (1) is provided with a balance plate (20) on its outer peripheral surface, and the balance plate (20) is arranged perpendicular to the axial direction of the mounting cylinder (1).

Images