Mining support

Abstract

The utility model relates to a mining support which comprises a first power piece and a second power piece. A telescopic rod; the reversing valve is connected to the first power part, the telescopic rod is connected to the reversing valve, and the reversing valve communicates with the first power part and the telescopic rod and is used for driving the telescopic rod to reciprocate; and the locking part is fixedly connected to the first power piece, and the reversing valve can be detachably connected into the locking part. The locking part is connected between the reversing valve and the first power piece, so that the reversing valve and the first power piece can be quickly disassembled and assembled, the reversing valve is convenient to replace and maintain, the downtime of the mining support is shortened, and the mining efficiency of a coal mine is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of mining, and in particular to a mining support. Background Art

[0002] The electro-hydraulic control reversing valve of the support uses a complex electrical and hydraulic control system, which includes numerous sensors, actuators and other components, which are prone to failure. The environmental conditions at the coal mining site are relatively harsh, and the components in the electro-hydraulic control reversing valve are often damaged, resulting in system performance degradation or even failure to work. Under conventional installation conditions, the electro-hydraulic control reversing valve of the support is difficult to disassemble and assemble, the maintenance time is long, and the maintenance quality cannot be fully guaranteed, which seriously affects the normal operation of underground production. Utility Model Content

[0003] The purpose of the present invention is to provide a mining support to solve the problems of difficulty in disassembly and assembly of the reversing valve and long maintenance time in the related art.

[0004] In order to achieve the above object, the present disclosure provides a mining support, the mining support comprising:

[0005] A first power member;

[0006] Telescopic rod;

[0007] a reversing valve, the reversing valve being connected to the first power member, the telescopic rod being connected to the reversing valve, and the reversing valve being communicated with the first power member and the telescopic rod respectively, for driving the telescopic rod to reciprocate; and

[0008] The locking portion is fixedly connected to the first power member, and the reversing valve can be detachably connected to the locking portion.

[0009] Optionally, the reversing valve includes a connecting plate, and the locking portion includes:

[0010] A fixing seat fixedly connected to the first power member; and

[0011] The pressing plate is movably connected to the fixing seat and can clamp the connecting plate between the pressing plate and the fixing seat.

[0012] Optionally, one end of the pressure plate is hinged to the fixed seat, and a through hole passing through the pressure plate is opened on the pressure plate, and the locking portion also includes a movably connected limiter, one end of the limiter is connected to the fixed seat, and the other end passes through the through hole and can limit the pressure plate when it contacts the surface of the pressure plate away from the fixed seat.

[0013] Optionally, the limiting member includes:

[0014] A fixing rod, wherein the fixing rod is disposed in the through hole and one end of the fixing rod is fixed to the fixing seat; and

[0015] The rotating block is rotatably connected to the other end of the fixing rod and is used to make the rotating block selectively contact with the surface of the pressing plate away from the fixing seat.

[0016] Optionally, the locking portion further includes a positioning pin, and the connecting plate and the fixing seat are both provided with a matching hole that matches with the positioning pin.

[0017] Optionally, the connecting plates are respectively arranged on both sides of the reversing valve, and the number of the locking parts is two, which respectively cooperate with the two connecting plates.

[0018] Optionally, the mining support includes a first oil inlet pipeline and a first oil outlet pipeline, the first power member is a hydraulic cylinder, and the reversing valve includes:

[0019] a main valve, comprising an oil tank respectively connected to the telescopic rod, the first oil inlet pipeline and the first oil outlet pipeline, the oil tank being selectively connected to the hydraulic cylinder through the first oil inlet pipeline and the first oil outlet pipeline; and

[0020] A pilot valve is connected to the main valve and is used to drive the main valve to selectively connect the oil tank and the hydraulic cylinder through the first oil inlet pipeline or the first oil outlet pipeline.

[0021] Optionally, the main valve comprises:

[0022] A first valve chamber is disposed in the main valve and is connected to the oil tank in an on-off manner; and

[0023] A first valve core is movably arranged in the first valve chamber to divide the first valve chamber into at least a first oil chamber and a second oil chamber, wherein the pilot valve can drive the first valve core to move so as to connect the first oil chamber with the first oil inlet pipeline and the oil tank respectively, or to connect the second oil chamber with the first oil outlet pipeline and the oil tank respectively.

[0024] Optionally, a first elastic member is further provided in the main valve, and the first elastic member is respectively provided in the first oil chamber and the second oil chamber, and one end of the first elastic member is connected to the first valve core, and the other end is fixed to the main valve.

[0025] Optionally, the mining support further includes a second oil inlet pipeline, and the pilot valve includes:

[0026] a second valve chamber, disposed in the pilot valve;

[0027] a second valve core movably disposed in the second valve chamber to divide the second valve chamber into at least a third oil chamber and a fourth oil chamber, wherein the third oil chamber is communicated with the first oil chamber, and the fourth oil chamber is communicated with the second oil chamber; and

[0028] Two second power members are arranged in the second valve chamber and are respectively located at the two ends of the second valve core, and can drive the second valve core to move, so as to connect the second oil inlet pipeline with the third oil chamber or the fourth oil chamber.

[0029] Optionally, a second elastic member is further provided in the pilot valve, and the second elastic member is respectively provided in the third oil chamber and the fourth oil chamber, and one end of the second elastic member is connected to the second valve core, and the other end is fixed to the pilot valve.

[0030] Through the above technical solution, a locking part is connected between the reversing valve and the first power component to achieve rapid disassembly and assembly between the reversing valve and the first power component, making the reversing valve easy to replace and repair, reducing the downtime of the mining support, and improving the mining efficiency of the coal mine.

[0031] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0033] Figure 1 It is a schematic diagram of a mining support according to an embodiment of the present disclosure.

[0034] Figure 2 It is a cross-sectional view of a mining support according to an embodiment of the present disclosure.

[0035] Figure 3 It is a cross-sectional view of a mining support according to an embodiment of the present disclosure from another perspective.

[0036] Figure 4 It is a schematic diagram of a locking portion of a mining support according to an embodiment of the present disclosure.

[0037] Figure 5 It is a cross-sectional view of a locking portion of a mining support according to an embodiment of the present disclosure.

[0038] Description of Reference Numerals

[0039] 1-first power member; 2-telescopic rod; 3-reversing valve; 30-connecting plate; 31-main valve; 311-oil bin; 312-first valve chamber; 3121-first oil chamber; 3122-second oil chamber; 3123-squeeze chamber; 313-first valve core; 314-first elastic member; 315-oil hole; 32-pilot valve; 321-second valve chamber; 3211-third oil chamber; 3212-fourth oil chamber; 3213 -sliding chamber; 322-second valve core; 323-second power member; 324-second elastic member; 33-oil channel; 4-locking part; 41-fixed seat; 42-pressure plate; 421-through hole; 43-limiting member; 431-fixed rod; 432-rotating block; 44-locating pin; 51-first oil inlet pipeline; 52-first oil outlet pipeline; 53-second oil inlet pipeline; 54-second oil outlet pipeline; 55-third oil outlet pipeline. DETAILED DESCRIPTION

[0040] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0041] In the present disclosure, unless otherwise stated, the directional words used, such as "upper" and "lower", are defined for the overall arrangement of the mining support, and "inner" and "outer" are defined for the profile of the corresponding components. The terms "first", "second" and the like are used for the purpose of distinguishing different components and do not have order and importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements.

[0042] According to one embodiment of the present disclosure, Figures 1 to 5 As shown, a mining support is provided, and the mining support may include a first power member 1, a telescopic rod 2, a reversing valve 3 and a locking portion 4. The reversing valve 3 may be connected to the first power member 1, the telescopic rod 2 is connected to the reversing valve 3, and the reversing valve 3 is respectively connected to the first power member 1 and the telescopic rod 2, and is used to drive the telescopic rod 2 to reciprocate, the locking portion 4 may be fixedly connected to the first power member 1, and the reversing valve 3 may be detachably connected to the locking portion 4.

[0043] Through the above technical solution, the locking part 4 is connected between the reversing valve 3 and the first power part 1 to achieve quick disassembly and assembly between the reversing valve 3 and the first power part 1, so that the reversing valve 3 is easy to replace and repair, reducing the downtime of the mining support and improving the mining efficiency of the coal mine.

[0044] Furthermore, if Figure 4 and Figure 5As shown, the reversing valve 3 may include a connecting plate 30, and the locking part 4 includes a fixing seat 41 and a pressing plate 42. The fixing seat 41 may be fixedly connected to the first power member 1, and the pressing plate 42 may be movably connected to the fixing seat 41, so that the connecting plate 30 can be clamped between the pressing plate 42 and the fixing seat 41. Here, a spring may be connected between the pressing plate 42 and the fixing seat 41, and the spring provides a force to pull the pressing plate 42 toward the fixing seat 41. In this way, it is only necessary to pull up the pressing plate 42 to form a gap between the pressing plate 42 and the fixing seat 41, and then release the pressing plate 42 after the connecting plate 30 is installed in the gap between the pressing plate 42 and the fixing seat 41. Under the influence of the spring tension, the pressing plate 42 and the fixing seat 41 can clamp the connecting plate 30 therebetween to complete the locking of the reversing valve 3. When the reversing valve 3 needs to be removed, the action of pulling up the pressing plate 42 is repeated to increase the gap between the pressing plate 42 and the fixing seat 41 , and the connecting plate 30 can be pulled out, thus completing the disassembly of the reversing valve 3 .

[0045] Furthermore, if Figure 4 and Figure 5 As shown, with respect to the connection mode between the pressing plate 42 and the fixing seat 41, one end of the pressing plate 42 can also be hinged to the fixing seat 41, and a through hole 421 penetrating the pressing plate 42 is provided on the pressing plate 42, and the locking portion 4 also includes a movably connected limiter 43, one end of the limiter 43 is connected to the fixing seat 41, and the other end passes through the through hole 421 and can limit the pressing plate 42 when it contacts the surface of the pressing plate 42 away from the fixing seat 41. The fixing seat 41 can include a mounting seat higher than the upper surface of the body of the fixing seat 41, and a groove can be provided on the mounting seat to accommodate the pressing plate 42 to increase the rotation range of the pressing plate 42, which is not limited in the present disclosure.

[0046] Specifically, with respect to the structure of the stopper 43, as shown in FIG. Figure 4 and Figure 5As shown, the structure of the stopper 43 can be that one end is a tension spring fixedly connected to the fixing seat 41, the tension spring is arranged in the through hole 421 and extends along the through direction of the through hole 421, and the other end is configured as a stopper end, which is arranged at one end of the tension spring passing through the through hole 421 and can be pressed on the pressure plate 42, so that only by pulling the stopper end to drive the tension spring to stretch, the pressure plate 42 can move relative to the fixing seat 41 to put the connecting plate 30 in or take it out between the two, and when the connecting plate 30 is installed or disassembled, the stopper end is released, and the pressing of the pressure plate 42 can be completed under the tension of the tension spring. The structure of the stopper 43 can also include a fixed rod 431 and a rotating block 432, the fixed rod 431 can be arranged in the through hole 421, and one end of the fixed rod 431 is fixed on the fixing seat 41. The rotating block 432 can be rotatably connected to the other end of the fixed rod 431, so as to make the rotating block 432 selectively contact the surface of the pressure plate 42 away from the fixing seat 41. When the pressure plate 42 needs to be able to rotate along the fixing seat 41, the rotating block 432 is screwed to rotate it until the rotating block 432 can pass through the through hole 421. Here, the rotating block 432 and the through hole 421 can both be set to be long strips. When the extension directions of the two are the same, the rotating block 432 can be accommodated in the through hole 421. At this time, the pressure plate 42 can be rotated so that the through hole 421 can allow the rotating block 432 to pass through to complete the movement of the pressure plate 42 and thereby install or remove the connecting plate 30. If the pressing plate 42 needs to be fixed on the fixing seat 41, then after the connecting plate 30 is installed between the pressing plate 42 and the fixing seat 41, the pressing plate 42 contacts the connecting plate 30, and the rotating block 432 passes through the through hole 421. The rotating block 432 is twisted to make the extending directions of the rotating block 432 and the through hole 421 different, so that the through hole 421 cannot allow the rotating block 432 to pass through, and the rotating block 432 can be pressed on the pressing plate 42 to complete the limiting of the pressing plate 42.

[0047] According to one embodiment of the present disclosure, Figure 4 and Figure 5 As shown, the locking portion 4 may further include a positioning pin 44, and the connecting plate 30 and the fixing seat 41 are both provided with a matching hole that matches the positioning pin 44. The positioning pin 44 serves to further strengthen the connection between the connecting plate 30 and the locking portion 4. When the connecting plate 30 is clamped between the fixing seat 41 and the pressing plate 42, the matching hole between the connecting plate 30 and the fixing seat 41 may be aligned, and then the positioning pin 44 is installed into the matching hole of the connecting plate 30 and the fixing seat 41 to connect the two, thereby achieving the purpose of further strengthening the connection between the connecting plate 30 and the fixing seat 41.

[0048] According to one embodiment of the present disclosure, Figures 1 to 3 As shown, the connecting plates 30 can be respectively arranged on both sides of the reversing valve 3, and the number of the locking parts 4 can be two, which are respectively matched with the two connecting plates 30, so that the connection between the reversing valve 3 and the locking parts 4 can be more stable.

[0049] According to one embodiment of the present disclosure, Figures 1 to 3 As shown, the mining support may further include a first oil inlet pipeline 51 and a first oil outlet pipeline 52, the first power member 1 is a hydraulic cylinder, and the reversing valve 3 may include a main valve 31 and a pilot valve 32. The main valve 31 may include an oil tank 311 connected to the telescopic rod 2, the first oil inlet pipeline 51 and the first oil outlet pipeline 52, respectively, and the oil tank 311 may be selectively connected to the hydraulic cylinder through the first oil inlet pipeline 51 and the first oil outlet pipeline 52. The pilot valve 32 may be connected to the main valve 31, and is used to drive the main valve 31 to selectively connect the oil tank 311 and the hydraulic cylinder through the first oil inlet pipeline 51 or the first oil outlet pipeline 52. In this way, when the pilot valve 32 drives the main valve 31 to connect the first oil inlet pipeline 51 to the oil tank 311 and the hydraulic cylinder, the oil enters the oil tank 311 and drives the telescopic rod 2 to extend. When the pilot valve 32 drives the main valve 31 to connect the first oil outlet pipeline 52 to the oil tank 311 and the hydraulic cylinder, the oil leaves the oil tank 311 and drives the telescopic rod 2 to retract. The function of the pilot valve 32 is to facilitate the control of the main valve 31, so that the reversing valve 3 can be used in occasions with a large flow rate. If the solenoid valve is used to drive the telescopic rod 2, because the thrust provided by the electromagnet is limited, when the flow rate is large, the electromagnet will not be able to push the valve core structure in the main valve 31. If the pilot valve 32 is provided, the flow direction of the oil can be changed by reversing the pilot valve 32, so that the main valve 31 can be reversed under the action of the oil.

[0050] Furthermore, if Figures 1 to 3As shown, the main valve 31 may include a first valve chamber 312 and a first valve core 313. The first valve chamber 312 may be disposed in the main valve 31 and may be connected to the oil tank 311 in an on-off manner. The first valve core 313 may be movably disposed in the first valve chamber 312 to separate the first valve chamber 312 into at least a first oil chamber 3121 and a second oil chamber 3122, wherein the pilot valve 32 may drive the first valve core 313 to move so as to connect the first oil chamber 3121 to the first oil inlet pipeline 51 and the oil tank 311, or to connect the second oil chamber 3122 to the first oil outlet pipeline 52 and the oil tank 311, respectively. The first valve core 313 can be arranged along the length direction of the first valve chamber 312, and three blocking sections can be formed at intervals on the first valve core 313. The cross-sectional size of the blocking section can cooperate with the side wall of the first valve chamber 312 to separate the adjacent blocking sections into the first oil chamber 3121 and the second oil chamber 3122. The size of the middle blocking section can be longer than the size of the blocking sections on both sides. In the original state where the reversing valve 3 is not working, the middle blocking section can block the oil through hole 315 between the oil tank 311 and the first valve chamber 312. When the telescopic rod 2 needs to be extended, the pilot valve 32 drives the first valve core 313 to move to one side. At this time, the middle blocking section is displaced until the oil through hole 315 and the first oil inlet pipeline 51 are exposed, so that the oil through hole 315 is connected with the first oil inlet pipeline 51 and the first oil chamber 3121, and the oil enters the oil tank 311 from the hydraulic cylinder to drive the telescopic rod 2 to extend. When the telescopic rod 2 needs to be retracted, the pilot valve 32 drives the first valve core 313 to move to the other side, and the middle blocking section is displaced until the oil hole 315 and the first oil outlet pipeline 52 are exposed, so that the oil hole 315 is connected with the first oil outlet pipeline 52 and the second oil chamber 3122, and the oil enters the hydraulic cylinder from the oil tank 311 to drive the telescopic rod 2 to be retracted. Here, the number of oil holes 315 can be two, and the two oil holes 315 can be respectively arranged relative to the positions where the first oil inlet pipeline 51 and the first oil outlet pipeline 52 are connected to the first valve chamber 312, so that when the first valve core 313 moves, the first oil inlet pipeline 51 and the first oil outlet pipeline 52 can be exposed and connected with the corresponding oil holes 315 at the same time.

[0051] Furthermore, if Figure 2 and Figure 3As shown, the main valve 31 may also be provided with a first elastic member 314, which is respectively provided in the first oil chamber 3121 and the second oil chamber 3122, and one end of the first elastic member 314 is connected to the first valve core 313, and the other end is fixed to the main valve 31. The first elastic member 314 here may be a spring or an elastic rubber, which is not limited in the present disclosure. In the original state where the reversing valve 3 is not working, the forces between the two first elastic members 314 are balanced, so that the first valve core 313 is located in the middle of the first valve chamber 312. When the pilot valve 32 drives the first valve core 313 to move, the force balance between the two first elastic members 314 is broken due to the displacement of the first valve core 313. At this time, one first elastic member 314 generates a pulling force, and the first elastic member 314 on the opposite side generates a thrust. When the telescopic rod 2 is extended or retracted to the target position, the pulling force generated by the corresponding first elastic member 314 and the thrust generated by the first elastic member 314 on the opposite side can bring the first valve core 313 back to its original position. The blocking section in the middle part cuts off the connection between the oil tank 311 and the hydraulic cylinder again, so that the telescopic rod 2 can maintain the corresponding position.

[0052] According to one embodiment of the present disclosure, Figures 1 to 3As shown, the mining support may further include a second oil inlet pipeline 53, and the pilot valve 32 may include a second valve chamber 321, a second valve core 322, and two second power members 323. The second valve chamber 321 may be disposed in the pilot valve 32, and the second valve core 322 may be movably disposed in the second valve chamber 321, so as to separate the second valve chamber 321 into at least a third oil chamber 3211 and a fourth oil chamber 3212, wherein the third oil chamber 3211 is in communication with the first oil chamber 3121, and the fourth oil chamber 3212 is in communication with the second oil chamber 3122, and the two second power members 323 may be disposed in the second valve chamber 321, respectively located at the two ends of the second valve core 322, and capable of driving the second valve core 322 to move, so as to make the second oil inlet pipeline 53 communicate with the third oil chamber 3211 or the fourth oil chamber 3212. Here, the second power member 323 can be an electromagnetic generator, and three blocking sections can be formed at intervals on the second valve core 322. The cross-sectional size of the blocking section can match the side wall of the second valve chamber 321 to separate the adjacent blocking sections into a third oil chamber 3211 and a fourth oil chamber 3212. The edge blocking section can also form two sliding chambers 3213 with the end side wall of the second valve chamber 321 in the length direction, and the edge blocking section of the first valve core 313 can also form two extrusion chambers 3123 with the end side wall of the first valve chamber 312 in the length direction, and the corresponding extrusion chambers 3123 and the corresponding sliding chambers 3213 can be connected through oil passages 33 The two power parts 323 can be respectively arranged in the two sliding chambers 3213. It should be noted that the mining support can also include a second oil outlet pipeline 54 and a third oil outlet pipeline 55. When the telescopic rod 2 needs to be extended, the second power part 323 close to the third oil chamber 3211 drives the second valve core 322 to move. At this time, the second oil inlet pipeline 53 is connected with the third oil chamber 3211, and the third oil chamber 3211 is connected with the corresponding extrusion chamber 3123 in the main valve 31 through the oil passage 33, thereby pushing the first valve core 313 to move and generate thrust for the telescopic rod 2. At this time, the second oil outlet pipeline 54 is not connected with the third oil chamber 3211, and the third oil outlet pipeline 55 is connected with the fourth oil chamber 3212. When the telescopic rod 2 needs to be retracted, the second power member 323 near the fourth oil chamber 3212 drives the second valve core 322 to move. At this time, the second oil inlet pipeline 53 is connected to the fourth oil chamber 3212, and the fourth oil chamber 3212 is connected to the corresponding extrusion chamber 3123 in the main valve 31 through another oil passage 33, thereby pushing the first valve core 313 to move. At this time, the telescopic rod 2 is retracted due to the outflow of oil. At this time, the second oil outlet pipeline 54 is connected to the third oil chamber 3211, and the third oil outlet pipeline 55 is not connected to the fourth oil chamber 3212. When the position of the second valve core 322 is restored, the second oil inlet pipeline 53 is not connected to the third oil chamber 3211 and the fourth oil chamber 3212, and the second oil outlet pipeline 54 and the third oil outlet pipeline 55 are connected to the third oil chamber 3211 and the fourth oil chamber 3212 respectively.

[0053] Furthermore, if Figure 2 As shown, a second elastic member 324 may also be provided in the pilot valve 32, and the second elastic member 324 is respectively provided in the third oil chamber 3211 and the fourth oil chamber 3212, and one end of the second elastic member 324 is connected to the second valve core 322, and the other end is fixed to the pilot valve 32. The second elastic member 324 here may be a spring or an elastic rubber, which is not limited in the present disclosure. In the original state where the reversing valve 3 is not working, the forces between the two second elastic members 324 are balanced, so that the second valve core 322 is located in the middle position of the second valve chamber 321. When one of the second power parts 323 drives the second valve core 322 to move, the force balance between the two second elastic parts 324 is broken due to the displacement of the second valve core 322. At this time, one second elastic part 324 generates a pulling force, and the second elastic part 324 on the opposite side generates a thrust. When the first valve core 313 moves to the target position, the pulling force generated by the corresponding second elastic part 324 and the thrust generated by the second elastic part 324 on the opposite side can bring the second valve core 322 back to its original position.

[0054] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0055] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0056] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A mining support, characterized in that: The mining support comprises: A first power member; Telescopic rod; a reversing valve, the reversing valve being connected to the first power member, the telescopic rod being connected to the reversing valve, and the reversing valve being communicated with the first power member and the telescopic rod respectively, for driving the telescopic rod to reciprocate; and The locking portion is fixedly connected to the first power member, and the reversing valve can be detachably connected to the locking portion.

2. The mining support according to claim 1, characterized in that: The reversing valve comprises a connecting plate, and the locking portion comprises: A fixing seat fixedly connected to the first power member; and The pressing plate is movably connected to the fixing seat and can clamp the connecting plate between the pressing plate and the fixing seat.

3. The mining support according to claim 2, characterized in that: One end of the pressure plate is hinged to the fixed seat, and a through hole penetrating the pressure plate is provided on the pressure plate. The locking portion also includes a movably connected limiting member, one end of the limiting member is connected to the fixed seat, and the other end passes through the through hole and can limit the pressure plate when it contacts the surface of the pressure plate away from the fixed seat.

4. The mining support according to claim 3, characterized in that: The limiting member comprises: A fixing rod, wherein the fixing rod is disposed in the through hole and one end of the fixing rod is fixed to the fixing seat; and The rotating block is rotatably connected to the other end of the fixing rod and is used to make the rotating block selectively contact with the surface of the pressing plate away from the fixing seat.

5. The mining support according to claim 2, characterized in that: The locking portion further comprises a positioning pin, and the connecting plate and the fixing seat are both provided with a matching hole matching with the positioning pin.

6. The mining support according to claim 2, characterized in that: The connecting plates are respectively arranged on both sides of the reversing valve, and the number of the locking parts is two, and they are respectively matched with the two connecting plates.

7. The mining support according to claim 1, characterized in that: The mining support comprises a first oil inlet pipeline and a first oil outlet pipeline, the first power member is a hydraulic cylinder, and the reversing valve comprises: a main valve, comprising an oil tank respectively connected to the telescopic rod, the first oil inlet pipeline and the first oil outlet pipeline, the oil tank being selectively connected to the hydraulic cylinder through the first oil inlet pipeline and the first oil outlet pipeline; and A pilot valve is connected to the main valve and is used to drive the main valve to selectively connect the oil tank and the hydraulic cylinder through the first oil inlet pipeline or the first oil outlet pipeline.

8. The mining support according to claim 7, characterized in that: The main valve comprises: A first valve chamber is disposed in the main valve and is connected to the oil tank in an on-off manner; and A first valve core is movably arranged in the first valve chamber to divide the first valve chamber into at least a first oil chamber and a second oil chamber, wherein the pilot valve can drive the first valve core to move so as to connect the first oil chamber with the first oil inlet pipeline and the oil tank respectively, or to connect the second oil chamber with the first oil outlet pipeline and the oil tank respectively.

9. The mining support according to claim 8, characterized in that: A first elastic member is also provided in the main valve. The first elastic member is respectively provided in the first oil chamber and the second oil chamber. One end of the first elastic member is connected to the first valve core, and the other end is fixed to the main valve.

10. The mining support according to claim 8, characterized in that: The mining bracket further includes a second oil inlet pipeline, and the pilot valve includes: a second valve chamber, disposed in the pilot valve; a second valve core movably disposed in the second valve chamber to divide the second valve chamber into at least a third oil chamber and a fourth oil chamber, wherein the third oil chamber is communicated with the first oil chamber, and the fourth oil chamber is communicated with the second oil chamber; and Two second power members are arranged in the second valve chamber and are respectively located at the two ends of the second valve core, and can drive the second valve core to move, so as to connect the second oil inlet pipeline with the third oil chamber or the fourth oil chamber.

11. The mining support according to claim 10, characterized in that: A second elastic member is also provided in the pilot valve. The second elastic member is respectively provided in the third oil chamber and the fourth oil chamber. One end of the second elastic member is connected to the second valve core, and the other end is fixed to the pilot valve.

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