Coal mine roof supporting bracket and supporting system

Abstract

The invention provides a coal mine roof supporting support and a supporting system.The coal mine roof supporting support comprises a base, a top beam and a supporting assembly, the supporting assembly comprises a central hydraulic supporting column and a plurality of connecting rod mechanisms, one end of the central hydraulic supporting column is fixedly connected with the base, and a ball head connecting assembly is arranged between the other end of the central hydraulic supporting column and the top beam; the connecting rod mechanisms are arranged around the central hydraulic prop at equal angles, each connecting rod mechanism comprises a first connecting rod and a second connecting rod which are hinged, the first connecting rods are hinged to the top beam, the second connecting rods are hinged to the base, and electric push rods are arranged between the first connecting rods and the second connecting rods so as to adjust the position of the top beam. The position and the inclination angle of the top beam can be accurately adjusted to adapt to the actual shape and deformation of a top plate, and the supporting safety can be improved.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, specifically to a coal mine roof support support and support system. Background Technology

[0002] In coal mining, roof support is crucial for operational safety and efficiency. Currently, hydraulic supports are the mainstream roof support equipment, relying on the extension and retraction of hydraulic cylinders in the columns between the roof beam and the base to provide support. However, coal mine geological conditions are complex, with significant roof undulations. In related technologies, the connection methods of various components in hydraulic supports are rigid, making it extremely difficult to adjust the position and angle of the hydraulic cylinders. Moreover, the adjustment precision is extremely low, failing to accurately adjust according to the actual roof conditions. This results in insufficient roof support, dangerous gaps between the roof and the support, increasing the risk of roof collapse and posing safety hazards to coal mining. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a coal mine roof support bracket and support system, which can precisely adjust the position and inclination angle of the roof beam to adapt to the actual shape and deformation of the roof, thus helping to improve support safety.

[0004] The coal mine roof support bracket provided in this embodiment of the invention includes: a base, a top beam, and a support assembly. The support assembly includes a central hydraulic support and multiple linkage mechanisms. One end of the central hydraulic support is fixedly connected to the base, and the other end of the central hydraulic support is provided with a ball joint connection assembly between it and the top beam. The multiple linkage mechanisms are arranged at equal angles around the central hydraulic support. Each linkage mechanism includes a first link and a second link that are hinged together. The first link is hinged to the top beam, and the second link is hinged to the base. An electric push rod is provided between the first link and the second link to realize the position adjustment of the top beam.

[0005] In summary, the coal mine roof support bracket provided by this invention, through the cooperation of the central hydraulic prop, multiple linkage mechanisms and ball joint connection components, can precisely adjust the position and tilt angle of the roof beam, better adapt to the unevenness and slight deformation of the roof, and enable the bracket to adapt to the roof support needs under different geological conditions and mining conditions, thus providing a strong guarantee for safe coal mine production.

[0006] In some embodiments, the ball joint assembly includes a ball joint seat, a connecting ball joint, an elastic element, and a ball joint friction plate. The ball joint seat has a rotating cavity, and the connecting ball joint is rotatably disposed in the rotating cavity. One end of the elastic element abuts against the inner wall of the rotating cavity, and the other end of the elastic element abuts against the ball joint friction plate, such that the ball joint friction plate abuts against the connecting ball joint.

[0007] In some embodiments, the ball joint assembly further includes a threaded rod, and the sidewall of the rotating cavity is provided with a threaded hole, the threaded rod being screwed into the threaded hole to abut against the elastic element.

[0008] In some embodiments, the elastic element includes two spring plates disposed opposite to each other.

[0009] In some embodiments, the top beam includes an intermediate plate and two connecting plates, the two connecting plates being respectively disposed on opposite sides of the intermediate plate, the connecting plates being inclined from the intermediate plate toward a direction away from the base, and a rotation shaft being provided between the connecting plates and the intermediate plate.

[0010] In some embodiments, the bottom of the connecting plate is provided with a connecting lug, the first connecting rod is provided with a lug connector, and a fixing shaft is provided between the connecting lug and the lug connector.

[0011] In some embodiments, the support assembly further includes two fiber Bragg grating sensors, which are disposed opposite each other along the length of the top beam and located on the connecting lugs of the connecting plate, and the fiber Bragg grating sensors are electrically connected to the electric push rod.

[0012] In some embodiments, the electric linear actuator includes a motor, a reducer, a torque limiter, and an encoder. The torque limiter is located at the output end of the motor to monitor the output torque of the motor, and the encoder is located at the reducer.

[0013] Furthermore, an embodiment of the present invention provides a coal mine roof support system including a scraper conveyor, a pushing component, and a coal mine roof support bracket provided in any of the above embodiments. The coal mine roof support bracket and the pushing component are arranged in a one-to-one correspondence. The pushing component includes a pushing cylinder and a pushing rod. The pushing cylinder is disposed on the base. One end of the pushing rod is connected to the output end of the pushing cylinder, and the other end of the pushing rod is connected to the scraper conveyor.

[0014] In some embodiments, the pushing assembly further includes an elastic spring disposed between the pushing cylinder and the pushing rod. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of a coal mine roof support bracket provided in an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the internal structure of a coal mine roof support bracket provided in an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the ball joint connection assembly in a coal mine roof support bracket according to an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the structure of the top beam in a coal mine roof support frame provided in an embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the base structure of a coal mine roof support bracket provided in an embodiment of the present invention.

[0020] Figure label: 10. Base; 11. First side plate; 12. Second side plate; 13. Mounting shaft; 14. Protective cover; 20. Top beam; 21. Intermediate plate; 22. Connecting plate; 23. Rotating shaft; 24. Connecting lug; 30. Support assembly; 31. Central hydraulic strut; 32. Linkage mechanism; 321. First link; 322. Second link; 323. Electric actuator; 324. Lug connector; 325. Fixed shaft; 326. Mounting hole; 33. Fiber optic grating sensor; 341. Motor; 342. Reducer; 343. Torque limiter; 344. Encoder; 345. Pressure monitor; 40. Ball joint assembly; 41. Ball joint seat; 411. Rotating cavity; 412. Threaded hole; 42. Connecting ball joint; 43. Elastic element; 431. Spring plate; 44. Ball joint friction plate; 441. Rotating groove; 45. Threaded rod; 50. Pushing assembly; 51. Pushing cylinder; 52. Pushing rod; 53. Elastic spring. Detailed Implementation

[0021] 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.

[0022] like Figures 1 to 5 As shown, an embodiment of the present invention provides a coal mine roof support bracket, which includes a base 10, a top beam 20, and a support assembly 30. The support assembly 30 includes a central hydraulic support 31 and multiple linkage mechanisms 32. One end of the central hydraulic support 31 is fixedly connected to the base 10, and the other end of the central hydraulic support 31 is provided with a ball joint connection assembly 40 between it and the top beam 20. The multiple linkage mechanisms 32 are arranged at equal angles around the central hydraulic support 31. The linkage mechanism 32 includes a first link 321 and a second link 322 that are hinged together. The first link 321 is hinged to the top beam 20, and the second link 322 is hinged to the base 10. An electric push rod 323 is provided between the first link 321 and the second link 322 to realize the position adjustment of the top beam 20.

[0023] Specifically, the base 10 is installed on the floor of the coal mine roadway, and the top beam 20 supports the roof of the coal mine roadway. One end of the central hydraulic system is fixedly connected to the base 10, and the other end is connected to the top beam 20 through a ball joint connection assembly 40. This allows the top beam 20 to swing at small angles in multiple directions, better adapting to the unevenness and minor deformation of the roof, ensuring that the top beam 20 always maintains a tight fit with the roof and improving the support effect. At the same time, the ball joint connection assembly 40 also has a certain shock absorption and buffering effect, effectively absorbing the vibration energy generated during mining and reducing damage to the support structure.

[0024] Multiple linkage mechanisms 32 are arranged at equal angles around the central hydraulic support 31, forming a uniformly distributed support network. When the position of the top beam 20 needs to be adjusted according to changes in the roof, the operator only needs to issue a command through the control system, and the electric push rod 323 will extend and retract according to a preset program, causing the first link 321 and the second link 322 to rotate relative to each other, thereby changing the extension and retraction height of the linkage mechanism 32. This adjustment method allows the top beam 20 to tilt at a certain angle, better adapting to the unevenness and slight deformation of the roof, ensuring that the top beam 20 always maintains a close fit with the roof, further improving the support effect. Furthermore, the electric push rod 323 has more precise adjustment accuracy, enabling the support to respond promptly to slight changes in the roof.

[0025] In summary, the coal mine roof support bracket provided by the present invention, through the cooperation of the central hydraulic prop 31, multiple linkage mechanisms 32 and ball joint connection assembly 40, can precisely adjust the position and tilt angle of the roof beam 20, better adapt to the unevenness and slight deformation of the roof, so that the bracket can adapt to the roof support needs under different geological conditions and mining conditions, and provide a strong guarantee for the safe production of coal mines.

[0026] Optionally, there are four linkage mechanisms 32, which are symmetrically arranged on both sides of the central hydraulic support 31 and located at the four corners of the base 10.

[0027] like Figure 2 and Figure 3 As shown, in some embodiments, the ball joint assembly 40 includes a ball joint seat 41, a connecting ball joint 42, an elastic element 43, and a ball joint friction plate 44. The ball joint seat 41 has a rotating cavity 411, the connecting ball joint 42 is rotatably disposed in the rotating cavity 411, one end of the elastic element 43 abuts against the inner wall of the rotating cavity 411, and the other end of the elastic element 43 abuts against the ball joint friction plate 44, so that the ball joint friction plate 44 abuts against the connecting ball joint 42.

[0028] Specifically, the rotating cavity 411 within the ball joint 41 provides a rotational space for the connecting ball 42, ensuring that the connecting ball 42 can move relative to the ball joint 41 in multiple directions. The elastic element 43 provides adaptive adjustment capability for the rotation of the connecting ball 42. When the top plate tilts, causing changes in the relative position and angle between the connecting ball 42 and the ball joint 41, the elastic element 43 can automatically adjust its compression according to the magnitude of the external force.

[0029] If the external force increases, the elastic element 43 is further compressed, allowing the connecting ball head 42 to rotate at a larger angle within the rotating cavity 411, thereby adapting to the angle changes between different parts of the support. When the external force decreases, the elastic element 43, relying on its own elastic restoring force, pushes the connecting ball head 42 back to its original position, restoring the support to a stable working state and ensuring that the support can respond promptly to changes in the roof and roadway, providing continuous and effective support for the coal mine roadway.

[0030] Meanwhile, the elastic element 43 also provides a damping mechanism for the rotation of the connecting ball head 42. Under normal circumstances, the rotation speed of the connecting ball head 42 is relatively slow. At this time, the damping force generated by the elastic element 43 is small and will not significantly hinder the flexible rotation of the connecting ball head 42, allowing the support to adjust the position and angle of each part in a timely manner according to changes in the roof and roadway. However, when the support is subjected to a sudden external impact, such as a sudden collapse of the roof or a violent vibration in the roadway, the rotation speed of the connecting ball head 42 will increase sharply. At this time, the damping force generated by the elastic element 43 will also increase rapidly, which can effectively suppress the rapid rotation of the connecting ball head 42, prevent the support from losing stability due to excessive shaking, and thus protect the safety of the entire support system.

[0031] In addition, the ball head friction plate 44 can ensure that the connecting ball head 42 is in full contact with the ball head friction plate 44 during rotation, so that the friction force is evenly distributed and the local stress concentration is avoided, which leads to increased wear.

[0032] Optionally, the ball joint seat 41 can be fixed to the top beam 20 by bolts, clips, or welding. Similarly, the connecting ball joint 42 can also be fixed to the central hydraulic support 31 by bolts, clips, or welding. In this embodiment, the ball joint friction plate 44 also has a rotating groove 441 that matches the connecting ball joint.

[0033] Furthermore, the ball joint connection assembly 40 also includes a threaded rod 45. A threaded hole 412 is provided on the side wall of the rotating cavity 411. The threaded rod 45 is screwed into the threaded hole 412 to abut against the elastic element 43, thereby applying a preload to the elastic element 43 and thus better utilizing its elastic performance. In addition, the preload of the elastic element 43 can be adjusted by the threaded rod 45, which helps to adjust the damping effect on the connecting ball joint 42.

[0034] Furthermore, the elastic element 43 includes two spring plates 431, which are arranged opposite to each other, so that when the two spring plates 431 are subjected to external force, they can fully exert their respective elastic properties and generate a mutually cooperating and effective elastic force. Among them, the spring plates 431 can be configured as disc springs.

[0035] like Figure 1 , Figure 4 As shown, in some embodiments, the top beam 20 includes an intermediate plate 21 and two connecting plates 22. The two connecting plates 22 are respectively disposed on opposite sides of the intermediate plate 21. The connecting plates 22 are inclined from the middle part toward the direction away from the base 10. A rotating shaft 23 is provided between the connecting plates 22 and the intermediate plate 21.

[0036] Specifically, two connecting plates 22 are positioned opposite each other on either side of the intermediate plate 21, and are inclined from the intermediate plate 21 toward the direction away from the base 10. That is, the connecting plates 22 are inclined from the bottom up from the intermediate plate 21, thus forming a structure that is low in the middle and high on both sides, resembling a slightly arched shape. When the top beam 20 is subjected to pressure from above, the inclined connecting plates 22 can decompose and transfer some of the pressure to the intermediate plate 21 and the central hydraulic support 31 below it, thereby effectively enhancing the compressive strength and stability of the top beam 20.

[0037] The rotating shaft allows the connecting plate 22 to rotate relative to the intermediate plate 21, giving the top beam 20 greater flexibility. In actual working scenarios, due to unevenness of the working surface or dynamic changes during equipment operation, the top beam 20 needs to constantly adjust its posture to adapt to different working conditions. By rotating the connecting plate 22 relative to the intermediate plate 21, the top beam 20 can more flexibly conform to the working surface, ensuring effective support for the load and avoiding problems such as unstable support or excessive local stress caused by gaps between the top beam 20 and the working surface.

[0038] Furthermore, the bottom of the connecting plate 22 is provided with a connecting lug 24, and the first connecting rod 321 is provided with a lug connector 324. A fixed shaft 325 is connected between the connecting lug 24 and the lug connector 324. That is to say, both the connecting lug and the lug connector are provided with mounting holes 326, and the fixed shaft passes through the mounting holes 326. This ensures that the fixed shaft can rotate smoothly in the mounting holes 326 without causing wobbling due to excessive clearance.

[0039] Of course, in this embodiment, the base 10 and the second connecting rod 322 can also be hinged by connecting lugs and lug connectors. For details, please refer to the connection form between the connecting plate 22 and the first connecting plate 22, which will not be described in detail here.

[0040] like Figure 4As shown, in some embodiments, the support assembly 30 further includes two fiber Bragg grating sensors 33. The fiber Bragg grating sensors 33 are arranged opposite each other along the length of the top beam 20 and located on the connecting lugs of the connecting plate 22. The fiber Bragg grating sensors 33 are electrically connected to the electric push rod. The two oppositely arranged fiber Bragg grating sensors 33 form an effective monitoring pair, which not only facilitates comprehensive and balanced monitoring of the stress on both sides of the top beam 20, but also allows for a more accurate determination of the overall state of the top beam 20 by comparing the data from the two sensors, eliminating monitoring errors caused by local interference factors, and improving the reliability and accuracy of the monitoring data.

[0041] Under normal operating conditions, when the top beam 20 is in a horizontal position, the two fiber optic grating sensors 33 are positioned opposite each other. At this time, the stress, strain, and other parameters monitored by them on both sides of the top beam 20 are basically the same, and the signals output by the sensors are also in a relatively balanced state. After receiving these balance signals, the control system determines that the top beam 20 is in a stable and reasonable support state, and no additional adjustment is required to the electric push rod 323.

[0042] When the top beam 20 is tilted, the two fiber optic sensors 33 will be misaligned, and the parameters monitored by them on both sides of the top beam 20 will show significant differences, thus providing a direct way to alert the operator that the top beam 20 is in an abnormal state. Simultaneously, this allows the operator to easily adjust the extension length of the electric push rod 323 in the connecting mechanism.

[0043] like Figure 2 As shown, in some embodiments, the electric actuator 323 also includes a motor 341, a reducer 342, a torque limiter 343, and an encoder 344. The torque limiter 343 is located at the output end of the motor 341 to monitor the output torque of the motor 341, and the encoder 344 is located at the reducer 342.

[0044] The torque limiter 343 prevents sudden pressure from damaging the motor 341, allowing the motor 341 to continuously output a stable load and avoiding system instability caused by sudden torque changes. The encoder 344 reads the precise push distance of the electric cylinder and feeds the data back to the control system. The control system then precisely adjusts the movement of the electric push rod 323 based on this data, ensuring that the top beam 20 accurately reaches the predetermined position, thus improving the stability and safety of the support.

[0045] Furthermore, the support assembly 30 also includes a pressure monitor 345, which is configured in a one-to-one correspondence with the electric push rod 323. The pressure monitor 345 is located at the connection between the electric push rod 323 and the first connecting rod to monitor the pressure parameters carried by the corresponding electric push rod 323.

[0046] Optionally, the pressure monitor 345 includes a pressure plate that can be directly connected to the electric actuator 323 or the first link, enabling real-time and accurate sensing of pressure changes at the connection point between the electric actuator 323 and the first link. Of course, in this embodiment, the encoder 344 can also be used to monitor the pose of the electric actuator 323, thus eliminating the need for an additional tilt sensor and reducing manufacturing costs.

[0047] Furthermore, the present invention also provides a coal mine roof support system, which includes a scraper conveyor, a pushing assembly 50, and the coal mine roof support bracket provided in the above embodiments, such as... Figure 2 As shown, the pushing component 50 and the coal mine roof support are set up one-to-one. The pushing component 50 includes a pushing cylinder 51 and a pushing rod 52. The pushing cylinder 51 is located on the base 10. One end of the pushing rod 52 is connected to the output end of the pushing cylinder 51, and the other end of the pushing rod 52 is connected to the scraper conveyor.

[0048] Furthermore, the pushing assembly 50 also includes an elastic spring 53, which is disposed between the pushing cylinder 51 and the pushing rod 52 to enhance the impact resistance of the pushing assembly 50. When the scraper conveyor encounters large pieces of ore or debris during coal transportation, a huge reaction force is generated. This force is quickly transmitted to the pushing rod 52, and the elastic spring 53 can quickly absorb and disperse most of the energy before the impact force reaches the pushing rod 52, minimizing the damage of the impact force to the pushing rod 52 and the pushing cylinder 51, and greatly improving the reliability and service life of the pushing assembly 50.

[0049] Optionally, the elastic spring 53 is configured as a disc spring.

[0050] Furthermore, the push assembly 50 also includes two decimal places, which are respectively located at both ends of the push rod 52. This allows the push rod 52 to adaptively adjust itself through the flexible rotation of the decimal places when transmitting power, even when encountering complex working conditions and irregular motion trajectories. This effectively reduces stress concentration and wear problems caused by motion obstruction, and greatly improves the service life and motion stability of the push assembly 50.

[0051] like Figure 5 As shown, in this embodiment, the base 10 is configured as a slipper-type structure. A first side plate 11 and a second side plate 12 are provided above the base 10. The first side plate 11 and the second side plate 12 are arranged opposite to each other. Mounting shafts 13 are provided on the brackets of the first side plate 11 and the second side plate 12. The push cylinder 51 is rotatably mounted on the mounting shaft 13, which can reduce the stress concentration between the push cylinder 51 and the side plate, extend the service life of the components, and reduce the maintenance cost of the equipment.

[0052] Furthermore, the pushing assembly 50 also includes a protective cover 14, which is located above the pushing cylinder 51 and the pushing rod 52. During coal mining, small pieces of rock, coal, and other debris may fall from the roof from time to time. The protective cover 14 can effectively block the impact of these falling debris, providing reliable protection for the pushing cylinder 51 and the pushing rod 52.

[0053] It should be noted that the coal mine roof support system provided in this application embodiment has the same implementation principle and technical effect as the aforementioned coal mine roof support support embodiment. For the sake of brevity, any parts not mentioned in the coal mine roof support system embodiment can be referred to the corresponding content in the aforementioned coal mine roof support support embodiment.

[0054] 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," "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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] In this invention, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are 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.

[0059] 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 roof support bracket, characterized in that, The system includes a base, a top beam, and a support assembly. The support assembly includes a central hydraulic strut and multiple linkage mechanisms. One end of the central hydraulic strut is fixedly connected to the base, and the other end of the central hydraulic strut is connected to the top beam via a ball joint connection assembly. The multiple linkage mechanisms are arranged at equal angles around the central hydraulic strut. Each linkage mechanism includes a first link and a second link that are hinged together. The first link is hinged to the top beam, and the second link is hinged to the base. An electric push rod is provided between the first link and the second link to adjust the position of the top beam.

2. The coal mine roof support bracket according to claim 1, characterized in that, The ball joint assembly includes a ball joint seat, a connecting ball joint, an elastic element, and a ball joint friction plate. The ball joint seat has a rotating cavity, and the connecting ball joint is rotatably disposed in the rotating cavity. One end of the elastic element abuts against the inner wall of the rotating cavity, and the other end of the elastic element abuts against the ball joint friction plate, so that the ball joint friction plate abuts against the connecting ball joint.

3. The coal mine roof support bracket according to claim 2, characterized in that, The ball joint assembly also includes a threaded rod, and the side wall of the rotating cavity is provided with a threaded hole. The threaded rod is screwed into the threaded hole to abut against the elastic element.

4. The coal mine roof support bracket according to claim 2, characterized in that, The elastic element includes two spring plates, which are arranged opposite to each other.

5. The coal mine roof support frame according to claim 1, characterized in that, The top beam includes a middle plate and two connecting plates. The two connecting plates are respectively disposed on opposite sides of the middle plate. The connecting plates are inclined from the middle plate toward the direction away from the base. A rotation shaft is provided between the connecting plates and the middle plate.

6. The coal mine roof support frame according to claim 5, characterized in that, The bottom of the connecting plate is provided with a connecting lug, the first connecting rod is provided with a lug connector, and a fixed shaft is provided between the connecting lug and the lug connector.

7. The coal mine roof support bracket according to claim 6, characterized in that, The support assembly also includes two fiber Bragg grating sensors, which are arranged opposite each other along the length of the top beam and located on the connecting lugs of the connecting plate. The fiber Bragg grating sensors are electrically connected to the electric push rod.

8. The coal mine roof support bracket according to claim 1, characterized in that, The electric linear actuator includes a motor, a reducer, a torque limiter, and an encoder. The torque limiter is located at the output end of the motor to monitor the output torque of the motor, and the encoder is located at the reducer.

9. A coal mine roof support system, characterized in that, The invention includes a scraper conveyor, a pushing assembly, and a coal mine roof support as described in any one of claims 1 to 8. The coal mine roof support and the pushing assembly are arranged in a one-to-one correspondence. The pushing assembly includes a pushing cylinder and a pushing rod. The pushing cylinder is disposed on the base. One end of the pushing rod is connected to the output end of the pushing cylinder, and the other end of the pushing rod is connected to the scraper conveyor.

10. The coal mine roof support system according to claim 9, characterized in that, The pushing assembly also includes an elastic spring, which is disposed between the pushing cylinder and the pushing rod.

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