A new type of anti-impact ground pressure buffer device and hydraulic support

Abstract

The present invention provides a novel anti-impact ground pressure buffer device and a hydraulic support, which relate to the technical field of mining equipment. The novel anti-impact ground pressure buffer device comprises an upper cylinder, an upper piston, an upper piston rod, a safety valve, a first one-way valve, a lower cylinder, a lower piston, a lower piston rod, a second one-way valve, a breaking container, a breaking piece and an energy storage device. The novel anti-impact ground pressure buffer device of the present invention, when applied to a hydraulic support, can meet the initial support force and normal support of the hydraulic support, can absorb the impact energy generated by the impact ground pressure when the impact ground pressure occurs, and automatically resets itself after the impact ground pressure occurs.

Description

Technical Field

[0001] The invention relates to the technical field of mining equipment, in particular to a novel anti-impact ground pressure buffer device and a hydraulic support. Background Art

[0002] When rock burst occurs underground in a coal mine, the hydraulic supports that normally support the working face will also be subject to instantaneous impacts from the rock burst. The cylinder length and thickness of the support column are designed and selected based on normal working conditions. Therefore, when the hydraulic support is subjected to instantaneous impacts from rock burst, its column is very likely to explode, causing the hydraulic support support to fail. The hydraulic buffer device currently used to resist rock burst can absorb the impact energy generated by rock burst, but it is difficult to meet the initial support force of the hydraulic support. In addition, the hydraulic buffer device currently used to resist rock burst requires manual resetting of the hydraulic buffer device after the rock burst occurs to prevent the top beam of the hydraulic support from detaching from the top plate, causing the hydraulic support support to fail. Summary of the invention

[0003] The purpose of the present invention is to provide a new type of anti-impact ground pressure buffer device, which can meet the initial support force and normal support of the hydraulic support, absorb the impact energy generated by the impact ground pressure when the impact ground pressure occurs, and automatically reset itself after the impact ground pressure occurs.

[0004] In order to achieve the above object, the technical solutions adopted by the present invention are as follows:

[0005] A novel anti-impact ground pressure buffer device comprises an upper cylinder, an upper piston, an upper piston rod, a safety valve, a first one-way valve, a lower cylinder, a lower piston, a lower piston rod, a second one-way valve, a breaking container, a breaking piece and an energy storage device;

[0006] The axial direction of the upper cylinder is arranged in the vertical direction, and the interior of the upper cylinder is slidably connected to the upper piston, and the upper piston can move along the axial direction of the upper cylinder;

[0007] The upper end of the upper piston rod is exposed from the upper end of the upper cylinder body, and the lower end of the upper piston rod is fixedly connected to the upper piston;

[0008] The space inside the upper cylinder body and below the upper piston is defined as an upper cavity, the upper cavity is connected to the safety valve and the first one-way valve, and the liquid inlet of the first one-way valve is connected to the first pipeline connector;

[0009] The axial direction of the lower cylinder is arranged in the vertical direction, and the interior of the lower cylinder is slidably connected to the lower piston, and the lower piston can move along the axial direction of the lower cylinder;

[0010] The upper end of the lower piston rod is exposed from the upper end of the lower cylinder body, the upper end of the lower piston rod is fixedly connected to the upper cylinder body, and the lower end of the lower piston rod is fixedly connected to the lower piston;

[0011] The space below the lower piston inside the lower cylinder is defined as a lower cavity, the lower cavity is connected to the second one-way valve, the liquid inlet of the second one-way valve is connected to the second pipeline joint, the lower cavity is connected to one end of the breaking container, a breaking piece is arranged in the breaking container, the other end of the breaking container is connected to the third pipeline joint, and the breaking piece isolates the communication between the lower cavity and the third pipeline joint;

[0012] The first pipeline joint and the third pipeline joint are both connected to the energy storage device via pipelines.

[0013] Preferably, a boss is provided at the upper end of the upper piston rod, an upper compression spring is connected between the boss and the upper cylinder body, and the upper piston rod passes through the interior of the upper compression spring.

[0014] Preferably, the upper cylinder body includes an upper cylinder sleeve, an inner sleeve, a limit cover and an upper end cover; a first annular step is provided at the upper end of the upper cylinder sleeve, a second annular step is provided at the upper end of the inner sleeve, the inner sleeve is embedded in the interior of the upper cylinder sleeve, and the second annular step overlaps the first annular step; the upper piston rod passes through the inner sleeve, and the upper compression spring is located between the upper piston rod and the inner wall of the inner sleeve in the circumferential direction; the lower end of the inner sleeve is equipped with a limit cover, and the upper end of the upper cylinder sleeve is equipped with an upper end cover, both ends of the upper piston rod pass through the limit cover and the upper end cover, and the upper compression spring is located between the boss and the inner wall of the limit cover in the axial direction.

[0015] Preferably, a downward compression spring is connected between the upper cylinder body and the lower cylinder body, and the lower piston rod passes through the interior of the downward compression spring.

[0016] Preferably, the lower cylinder body comprises a lower cylinder sleeve and a lower end cover, the upper end of the lower piston rod passes through the lower end cover, and the upper end of the lower cylinder sleeve is assembled with the lower end cover.

[0017] Preferably, a threaded hole is provided at the lower end of the upper cylinder body, an external thread is provided at the upper end of the lower piston rod, and the upper end of the lower piston rod is threadedly connected to the threaded hole.

[0018] Preferably, a stop valve is provided on the pipeline connecting the lower cavity and the breaking container.

[0019] Preferably, the breaking container comprises a left breaking disk and a right breaking disk, the left breaking disk is detachably connected to the right breaking disk, and the breaking piece is located between the left breaking disk and the right breaking disk.

[0020] Preferably, a threaded hole is provided at one end of the left breaking disk, an external thread is provided at one end of the right breaking disk, and one end of the right breaking disk is threadedly connected in the threaded hole.

[0021] The present invention also provides a hydraulic support, comprising a top beam, a base and a column, wherein the novel anti-impact ground pressure buffer device is arranged between the column and the top beam, or the novel anti-impact ground pressure buffer device is arranged between the column and the base.

[0022] The beneficial technical effects of the present invention are:

[0023] The novel anti-impact ground pressure buffer device of the present invention is applied to the hydraulic support. When the hydraulic support is normally supported, hydraulic oil is injected into the lower cavity through the second pipe joint via the second one-way valve, and the lower piston drives the lower piston rod to rise, so that the upper cylinder body is raised relative to the lower cylinder body. The accumulator injects hydraulic oil into the upper cavity through the first pipe joint via the first one-way valve, and the upper piston drives the upper piston rod to rise relative to the upper cylinder body. At this time, the initial supporting force of the hydraulic support can be met; when the top plate pressure occurs during the normal support process of the hydraulic support, the hydraulic oil pressure in the upper cavity increases, and the safety valve releases pressure for buffering. At this time, the hydraulic oil pressure in the lower cavity increases, but the pressure does not increase to the point of causing the broken pieces to break; when impact ground pressure occurs, the upper The hydraulic oil pressure in the cavity increases instantaneously, and the safety valve releases pressure to buffer. At the same time, the hydraulic oil pressure in the lower cavity increases instantaneously, the broken pieces break instantaneously, and the hydraulic oil in the lower cylinder flows into the accumulator. When the broken pieces break, the lower piston falls instantaneously relative to the lower cylinder, thereby absorbing the impact energy generated by the impact ground pressure. After the impact ground pressure occurs, the top beam of the hydraulic support separates from the top plate, and the accumulator injects hydraulic oil into the upper cavity through the first pipe joint and the first one-way valve, and the accumulator injects hydraulic oil into the lower cavity through the third pipe joint to realize automatic resetting of the buffer device itself, thereby basically restoring the initial support state of the hydraulic support, avoiding the top beam of the hydraulic support from separating from the top plate, resulting in failure of the hydraulic support support. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a novel anti-impact ground pressure buffer device according to an embodiment of the present invention;

[0025] Figure 2 This is a schematic structural diagram of the upper cylinder portion of a novel anti-impact ground pressure buffer device according to an embodiment of the present invention;

[0026] Figure 3 It is a schematic structural diagram of the lower cylinder part of the novel anti-impact ground pressure buffer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. Certain embodiments of the present invention will be described more comprehensively with reference to the accompanying drawings, in which some but not all embodiments will be shown. In fact, the various embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the embodiments described herein; rather, these embodiments are provided so that the present invention meets applicable legal requirements.

[0028] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "back" and the like indicate directions or positional relationships based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In an embodiment of the present invention, a new type of anti-impact ground pressure buffer device is provided. Please refer to Figures 1 to 3 shown.

[0030] A novel anti-impact ground pressure buffer device includes an upper cylinder body, an upper piston 211, an upper piston rod 212, a safety valve 3, a first one-way valve 41, a lower cylinder body, a lower piston 221, a lower piston rod 222, a second one-way valve 42, a breaking container, a breaking piece 62 and an energy storage device 7, etc.

[0031] The axial direction of the upper cylinder is arranged in the vertical direction, and the interior of the upper cylinder is slidably connected to the upper piston 211, and the upper piston 211 can move along the axial direction of the upper cylinder. The upper end of the upper piston rod 212 is exposed from the upper end of the upper cylinder, and the lower end of the upper piston rod 212 is assembled with the upper piston 211. The interior of the upper cylinder and the space below the upper piston 211 are defined as an upper cavity, which is connected to the safety valve 3 and the first one-way valve 41 through a pipeline, and the liquid inlet of the first one-way valve 41 is connected to the first pipeline connector 81.

[0032] The upper end of the upper piston rod 212 is provided with a boss 213, and an upper compression spring 214 is connected between the boss 213 and the upper cylinder body, and the upper piston rod 212 passes through the interior of the upper compression spring 214. In this way, when the upper piston 211 moves axially along the upper cylinder body, especially when the upper piston 211 moves downward along the upper cylinder body, the upper compression spring 214 can buffer and avoid hard impact between the upper piston 211 and the upper cylinder body.

[0033] The upper cylinder body comprises an upper cylinder sleeve 11, an inner sleeve 12, a limit cover 13 and an upper end cover 14. A first annular step is provided at the upper end of the upper cylinder sleeve 11, a second annular step is provided at the upper end of the inner sleeve 12, the inner sleeve 12 is embedded in the interior of the upper cylinder sleeve 11, and the second annular step overlaps the first annular step. The upper piston rod 212 passes through the inner sleeve 12, and the upper compression spring 214 is located between the upper piston rod 212 and the inner wall of the inner sleeve 12 in the circumferential direction. The limit cover 13 is assembled at the lower end of the inner sleeve 12, and the upper end cover 14 is assembled at the upper end of the upper cylinder sleeve 11. Both ends of the upper piston rod 212 pass through the limit cover 13 and the upper end cover 14, and the upper compression spring 214 is located between the boss 213 and the inner wall of the limit cover 13 in the axial direction. When assembling the upper cylinder body, first pass the lower end of the upper piston rod 212 through the inner sleeve 12, put the upper compression spring 214 on the upper piston rod 212, pass the lower end of the upper piston rod 212 through the limit cover 13, assemble the limit cover 13 on the lower end of the inner sleeve 12, put the inner sleeve 12, the limit cover 13, the upper piston rod 212 and the upper compression spring 214 into the upper cylinder sleeve 11 together, and finally pass the upper end of the upper piston rod 212 through the upper end cover 14 and assemble the upper end cover 14 on the upper end of the upper cylinder sleeve 11, so as to facilitate the assembly of the upper cylinder body.

[0034] The axial direction of the lower cylinder is arranged along the vertical direction, and the lower piston 221 is slidably connected to the interior of the lower cylinder, and the lower piston 221 can move along the axial direction of the lower cylinder. The upper end of the lower piston rod 222 is exposed from the upper end of the lower cylinder, and the upper end of the lower piston rod 222 is fixedly connected to the upper cylinder (upper cylinder sleeve 11), and the lower end of the lower piston rod 222 is assembled with the lower piston 221. The interior of the lower cylinder and the space below the lower piston 221 are defined as a lower cavity, and the lower cavity is connected to the second one-way valve 42, and the liquid inlet of the second one-way valve 42 is connected to the second pipe joint 82; the lower cavity is connected to one end of the breaking container, and a breaking piece 62 is arranged in the breaking container, and the other end of the breaking container is connected to the third pipe joint 83, and the breaking piece 62 isolates the communication between the lower cavity and the third pipe joint 83.

[0035] A lower compression spring 223 is connected between the upper cylinder body and the lower cylinder body, and the lower piston rod 222 passes through the lower compression spring 223. In this way, when the lower piston 221 moves axially along the lower cylinder body, especially when the lower piston 221 moves downward along the lower cylinder body, the buffering of the lower compression spring 223 can avoid hard impact between the lower piston 221 and the lower cylinder body.

[0036] The lower end of the upper cylinder body (upper cylinder sleeve 11) is provided with a threaded hole, the upper end of the lower piston rod 222 is provided with an external thread, and the upper end of the lower piston rod 222 is threadedly connected in the threaded hole. The above-mentioned lower cylinder body includes a lower cylinder sleeve 51 and a lower end cover 52, the upper end of the lower piston rod 222 passes through the lower end cover 52, and the upper end of the lower cylinder sleeve 51 is assembled with the lower end cover 52.

[0037] When assembling the lower cylinder body, first pass the upper end of the lower piston rod 222 through the lower end cover 52, assemble the lower end cover 52 on the upper end of the lower cylinder sleeve 51, put the lower compression spring 223 on the lower piston rod 222, and finally thread the upper end of the lower piston rod 222 into the threaded hole at the lower end of the upper cylinder sleeve 11, so as to facilitate the assembly of the lower cylinder body.

[0038] A stop valve 9 is provided on the pipeline connecting the lower cavity and the breaking container. Thus, when the breaking piece 62 needs to be replaced, the pipeline connected to the lower cavity can be cut off by the stop valve 9. In addition, a stop valve 9 is also provided on the pipeline between the energy accumulator 7 and the first pipeline connector 81 and the third pipeline connector 83 to cut off the corresponding pipeline.

[0039] The break container includes a left break disk 611 and a right break disk 612, the left break disk 611 is detachably connected to the right break disk 612, and the break piece 62 is located between the left break disk 611 and the right break disk 612. In this way, after the break piece 62 is broken, the break container can be disassembled to facilitate replacement of the break piece 62. Specifically, a threaded hole is provided at one end of the left break disk 611, an external thread is provided at one end of the right break disk 612, and one end of the right break disk 612 is threadedly connected to the threaded hole.

[0040] The first pipeline joint 81 and the third pipeline joint 82 are both connected to the accumulator 7 via pipelines. In addition, the accumulator 7 is also connected to an external accumulator via a joint, so that when the hydraulic energy in the accumulator 7 is low, high-pressure hydraulic oil is added to the accumulator 7 from the external accumulator.

[0041] An embodiment of the present invention also provides a hydraulic support, including a top beam, a base and a column. The first arrangement method is to set the new anti-impact ground pressure buffer device mentioned above in this embodiment between the column and the top beam, and the upper end of the upper piston rod 212 is assembled with the top beam through a connecting piece, and the lower end of the lower cylinder sleeve 51 is assembled with the upper end of the column through a connecting piece; the second arrangement method is to set the new anti-impact ground pressure buffer device mentioned above in this embodiment between the column and the base, and the upper end of the upper piston rod 212 is assembled with the lower end of the column through a connecting piece, and the lower end of the lower cylinder sleeve 51 is assembled with the base through a connecting piece.

[0042] So far, the present embodiment has been described in detail in conjunction with the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the novel anti-impact ground pressure buffer device of the present invention. The novel anti-impact ground pressure buffer device of the present invention is applied to a hydraulic support. When the hydraulic support is normally supported, hydraulic oil is injected into the lower cavity through the second pipe joint 82 via the second one-way valve 42, and the lower piston 221 drives the lower piston rod 222 to rise, so that the upper cylinder body rises relative to the lower cylinder body, and the accumulator 7 injects hydraulic oil into the upper cavity through the first pipe joint 81 via the first one-way valve 41, and the upper piston 211 drives the upper piston rod 212 to rise relative to the upper cylinder body. At this time, the initial supporting force of the hydraulic support can be met; when the top plate pressure occurs during the normal support process of the hydraulic support, the hydraulic oil pressure in the upper cavity increases, and the safety valve 3 relieves the pressure to buffer. At this time, the hydraulic oil pressure in the lower cavity increases, but the pressure does not increase to cause the breaking piece 62 to break; when it occurs When the ground pressure is impacted, the hydraulic oil pressure in the upper cavity increases instantaneously, and the safety valve 3 releases pressure for buffering. At the same time, the hydraulic oil pressure in the lower cavity increases instantaneously, the breaking piece 62 breaks instantaneously, and the hydraulic oil in the lower cylinder flows into the accumulator 7. When the breaking piece 62 breaks, the lower piston 221 falls instantaneously relative to the lower cylinder, thereby absorbing the impact energy generated by the impact ground pressure. After the impact ground pressure occurs, the top beam of the hydraulic support separates from the top plate, and the accumulator 7 injects hydraulic oil into the upper cavity through the first pipe joint 81 via the first one-way valve 41, and the accumulator 7 injects hydraulic oil into the lower cavity through the third pipe joint 83 to realize the automatic resetting of the buffer device itself, thereby basically restoring the initial support state of the hydraulic support, avoiding the top beam of the hydraulic support from separating from the top plate, resulting in failure of the hydraulic support support.

[0043] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of anti-impact ground pressure buffer device, characterized in that: It includes an upper cylinder body, an upper piston, an upper piston rod, a safety valve, a first one-way valve, a lower cylinder body, a lower piston, a lower piston rod, a second one-way valve, a breaking container, a breaking piece and an energy storage device; The axial direction of the upper cylinder is arranged in the vertical direction, and the interior of the upper cylinder is slidably connected to the upper piston, and the upper piston can move along the axial direction of the upper cylinder; The upper end of the upper piston rod is exposed from the upper end of the upper cylinder body, and the lower end of the upper piston rod is fixedly connected to the upper piston; The space inside the upper cylinder body and below the upper piston is defined as an upper cavity, the upper cavity is connected to the safety valve and the first one-way valve, and the liquid inlet of the first one-way valve is connected to the first pipeline connector; The axial direction of the lower cylinder is arranged in the vertical direction, and the interior of the lower cylinder is slidably connected to the lower piston, and the lower piston can move along the axial direction of the lower cylinder; The upper end of the lower piston rod is exposed from the upper end of the lower cylinder body, the upper end of the lower piston rod is fixedly connected to the upper cylinder body, and the lower end of the lower piston rod is fixedly connected to the lower piston; The space below the lower piston inside the lower cylinder is defined as a lower cavity, the lower cavity is connected to the second one-way valve, the liquid inlet of the second one-way valve is connected to the second pipeline joint, the lower cavity is connected to one end of the breaking container, a breaking piece is arranged in the breaking container, the other end of the breaking container is connected to the third pipeline joint, and the breaking piece isolates the communication between the lower cavity and the third pipeline joint; The first pipeline joint and the third pipeline joint are both connected to the energy storage device via pipelines.

2. A novel anti-impact ground pressure buffer device according to claim 1, characterized in that: A boss is arranged at the upper end of the upper piston rod, an upper compression spring is connected between the boss and the upper cylinder body, and the upper piston rod passes through the interior of the upper compression spring.

3. A novel anti-impact ground pressure buffer device according to claim 2, characterized in that: The upper cylinder body includes an upper cylinder sleeve, an inner sleeve, a limit cover and an upper end cover; a first annular step is provided at the upper end of the upper cylinder sleeve, a second annular step is provided at the upper end of the inner sleeve, the inner sleeve is embedded in the interior of the upper cylinder sleeve, and the second annular step overlaps the first annular step; the upper piston rod passes through the inner sleeve, and the upper compression spring is located between the upper piston rod and the inner wall of the inner sleeve in the radial direction; the lower end of the inner sleeve is equipped with a limit cover, and the upper end of the upper cylinder sleeve is equipped with an upper end cover, both ends of the upper piston rod pass through the limit cover and the upper end cover, and the upper compression spring is located between the boss and the inner wall of the limit cover in the axial direction.

4. A novel anti-impact ground pressure buffer device according to claim 1, characterized in that: A downward compression spring is connected between the upper cylinder body and the lower cylinder body, and the lower piston rod passes through the interior of the downward compression spring.

5. A novel anti-impact ground pressure buffer device according to claim 1, characterized in that: The lower cylinder body comprises a lower cylinder sleeve and a lower end cover. The upper end of the lower piston rod passes through the lower end cover, and the upper end of the lower cylinder sleeve is assembled with the lower end cover.

6. A novel anti-impact ground pressure buffer device according to claim 1, characterized in that: A threaded hole is provided at the lower end of the upper cylinder body, an external thread is arranged at the upper end of the lower piston rod, and the upper end of the lower piston rod is threadedly connected in the threaded hole.

7. A novel anti-impact ground pressure buffer device according to claim 1, characterized in that: A stop valve is arranged on the pipeline connecting the lower cavity and the breaking container.

8. The novel anti-impact ground pressure buffer device according to claim 1 is characterized in that: The breaking container comprises a left breaking disk and a right breaking disk, wherein the left breaking disk is detachably connected to the right breaking disk, and the breaking piece is located between the left breaking disk and the right breaking disk.

9. A novel anti-impact ground pressure buffer device according to claim 8, characterized in that: One end of the left breaking disk is provided with a threaded hole, one end of the right breaking disk is provided with an external thread, and one end of the right breaking disk is threadedly connected in the threaded hole.

10. A hydraulic support, comprising a top beam, a base and a column, characterized in that: A novel anti-impact ground pressure buffer device as claimed in any one of claims 1 to 9 is arranged between the column and the top beam, or a novel anti-impact ground pressure buffer device as claimed in any one of claims 1 to 9 is arranged between the column and the base.

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