Hydraulic support column bottom valve pressure test tool

Abstract

The present invention relates to a pressure testing tool for a bottom valve of a hydraulic support column, comprising a pressure testing cylinder sleeve and a supporting sleeve, wherein the pressure testing cylinder sleeve comprises a cylinder cover and a direct joint arranged above the cylinder cover, wherein the cylinder cover is a hollow structure with a through bottom, a liquid inlet is provided on the cylinder cover, and the supporting sleeve is connected to the cylinder cover through a thread, and the supporting sleeve is a hollow structure with a through bottom, wherein the direct joint, the liquid inlet, and the supporting sleeve are connected in correspondence with each other in the upper and lower parts; wherein the outer contour cross-section of the lower end of the supporting sleeve is prismatic, and a stepped mounting hole is provided in the supporting sleeve, and a bottom valve is detachably connected in the mounting hole, and the bottom valve is fitted with the inner wall of the mounting hole; wherein the liquid inlet and the bottom valve correspond to each other in the upper and lower parts, and a gap exists between the bottom valve and the liquid inlet to form an oil chamber, and the oil chamber is located in the mounting hole. The present invention has a simple structure and can be conveniently assembled and disassembled from the bottom valve, thereby improving the pressure testing efficiency and facilitating the determination of whether the opening pressure of the hydraulic support column bottom valve meets the design requirements.

Description

Technical Field

[0001] The invention relates to the technical field of mining hydraulic supports, in particular to a hydraulic support column bottom valve pressure testing tool. Background Art

[0002] Hydraulic supports can greatly protect the personal safety of miners during coal mining. Coal mining places high demands on the reliability and stability of hydraulic supports, which requires support manufacturers to strictly follow design requirements for reasonable design and production. This also requires that all components, including the bottom valve, must be strictly controlled for quality.

[0003] During the hydraulic support design process, different requirements are set for the opening pressure of the column bottom valve according to the different working conditions of the mine face. To improve work efficiency, reduce labor costs, and avoid batch rework of columns due to incorrect bottom valve opening pressure, the opening pressure of the bottom valve must be confirmed and reviewed before column assembly.

[0004] During the pressure test operation, the pressure test system is connected to the pressure test fixture through a pipeline. A bottom valve is installed in the pressure test fixture. Hydraulic oil is pressed into the bottom valve through the pressure test system to observe whether the pressure gauge pressure when the bottom valve is opened is consistent with the designed opening pressure, and then determine whether the bottom valve opening pressure meets the design standard.

[0005] Most existing pressure test tools have complex structures, making it inconvenient to install and remove the bottom valve, and the installation and removal process is time-consuming and labor-intensive. Some pressure test tools have simplified structures, but are relatively cumbersome to use in practice. For example, the authorization announcement No. CN211504657U discloses a pressure test device for the opening of a column bottom valve. During the test, the quick-release connector is connected to the liquid inlet pipe, but the connector seat needs to be removed after the test. In order to facilitate the removal of the connector seat, the liquid inlet pipe needs to be separated from the quick-release connector first, which is relatively cumbersome. When facing the pressure test of a large number of bottom valves, frequent disassembly and assembly of the liquid inlet pipe and the quick-release connector can easily cause oil leakage at the connection between the two, affecting the normal pressure test operation. To this end, a hydraulic support column bottom valve pressure test tool is proposed. Summary of the Invention

[0006] In order to solve the problems in the prior art that the pressure test tooling structure is complex and inconvenient to disassemble and assemble with the bottom valve, the present invention provides a hydraulic support column bottom valve pressure test tool. By simplifying the pressure test tooling structure, it can be conveniently installed with the bottom valve, while improving the pressure test efficiency.

[0007] In order to achieve the above object, the technical solution of the present invention is:

[0008] The hydraulic support column bottom valve pressure test tool includes a pressure test cylinder sleeve and a support sleeve. The pressure test cylinder sleeve includes a cylinder cover and a union head arranged above the cylinder cover. The cylinder cover is a hollow structure with a through lower end, and a liquid inlet is provided on the cylinder cover. The support sleeve is threadedly connected inside the cylinder cover. The support sleeve is a hollow structure with a through upper and lower end. The union head, the liquid inlet, and the support sleeve are vertically and correspondingly connected.

[0009] The height of the support sleeve is greater than the height of the cylinder cover. The cross-section of the lower end outer contour of the support sleeve is prismatic to form a tightening section. A stepped mounting hole is provided inside the support sleeve, and a bottom valve is detachably connected inside the mounting hole, and the bottom valve fits against the inner wall of the mounting hole.

[0010] The liquid inlet and the bottom valve are vertically corresponding, and there is a gap between the bottom valve and the liquid inlet to form an oil cavity, and the oil cavity is located inside the mounting hole.

[0011] Further, the cylinder cover is a hollow structure made of 27SiMn. The cross-section of the cylinder cover is an inverted "U" shape, and the outer contour of the cylinder cover is prismatic for easy fixation. The liquid inlet is located in the middle above the cylinder cover.

[0012] Further, the union head is a tubular structure made of 20CrMo. The union head is welded in the middle above the cylinder cover. The union head and the liquid inlet are connected, and the inner diameter of the union head is greater than the aperture of the liquid inlet.

[0013] Further, the lower end surface of the support sleeve extends beyond the lower end surface of the cylinder cover, and a sealing ring is provided between the joint surface of the support sleeve and the cylinder cover. The lower end of the bottom valve extends out of the mounting hole, and a sealing ring is also provided between the joint surface of the bottom valve and the mounting hole.

[0014] Further, the support sleeve includes an integrally formed closed section and a connecting section. The closed section and the connecting section are vertically connected and combined into a stepped shape with a smaller upper part and a larger lower part. The mounting hole penetrates through the sealing section and the connecting section, and the mounting hole is a stepped shape with a larger upper part and a smaller lower part.

[0015] Further, the outer contour of the closed section is smooth, and the sealing ring is arranged between the joint surface of the closed section and the cylinder cover. The outer contour of the connecting section is provided with threads, and the support sleeve is connected to the cylinder cover through the connecting section.

[0016] Further, the stepped change of the mounting hole forms a mounting shoulder, and the bottom valve abuts against the mounting shoulder. The oil cavity is arranged in the mounting hole between the upper end of the bottom valve and the liquid inlet.

[0017] Through the above technical solutions, the beneficial effects of the present invention are as follows:

[0018] The structure of the present invention is reasonably designed. The supporting sleeve and the cylinder cover are connected by threads. At the same time, the lower end of the supporting sleeve is prism-shaped, which can be well matched with disassembly and assembly tools to tighten or loosen the supporting sleeve, greatly facilitating the disassembly and assembly of the supporting sleeve and the cylinder cover. The operation is convenient and fast, and the bottom valve can be quickly installed into or removed from the supporting sleeve, further improving the working efficiency of the pressure test.

[0019] The present invention does not require frequent disassembly and assembly of pipelines. The bottom valve can be disassembled and assembled only by turning the supporting sleeve. The disassembly is fast. Through two sealing rings at different positions, the leakage of oil can be prevented, enhancing the precision of this pressure test tool, and it can be well applied to the test operation of the opening pressure of the bottom valve. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the bottom valve pressure test tool for the hydraulic support column of the present invention.

[0021] Figure 2 It is a schematic diagram of the pressure test cylinder sleeve structure of the bottom valve pressure test tool for the hydraulic support column of the present invention.

[0022] Figure 3 It is a schematic diagram of the supporting sleeve structure of the bottom valve pressure test tool for the hydraulic support column of the present invention.

[0023] In the drawings, the reference numerals are: 1 is the pressure test cylinder sleeve, 2 is the supporting sleeve, 21 is the closed section, 22 is the connecting section, 3 is the cylinder cover, 4 is the union, 5 is the liquid inlet, 6 is the mounting hole, 7 is the bottom valve, 8 is the oil cavity, 9 is the sealing ring, 10 is the tightening section, and 11 is the mounting shoulder. Detailed Embodiment

[0024] The present invention will be further described below in conjunction with the drawings and the detailed embodiment:

[0025] As Figures 1 to 3 shown, the bottom valve pressure test tool for the hydraulic support column includes a pressure test cylinder sleeve 1 and a supporting sleeve 2. The pressure test cylinder sleeve 1 includes a cylinder cover 3 and a union 4 arranged above the cylinder cover 3. The cylinder cover 3 is a hollow structure with a through lower end. Specifically, the cylinder cover 3 is a hollow structure made of 27SiMn. 27SiMn has the characteristics of good machinability, medium cold deformation plasticity and weldability, and also has quite high strength and wear resistance, which is suitable for this pressure test operation scenario.

[0026] In this embodiment, the cross-section of the cylinder cover 3 is an inverted "U" shape, and a liquid inlet 5 is opened on the cylinder cover 3. The liquid inlet 5 is located in the middle above the cylinder cover 3.

[0027] In order to facilitate the fixation of the pressure test cylinder sleeve 1, the outer contour of the cylinder cover 3 is prism-shaped for easy fixation. The outer contour of the cylinder cover 3 being prism-shaped means that its outer contour is composed of multiple circumferentially evenly distributed planes. Compared with a cylindrical surface, using planes can increase its contact area with the fixing fixture, and thus increase friction to achieve effective fixation.

[0028] In this embodiment, the direct connector 4 is welded to the middle part above the cylinder cover 3. The direct connector 4 is a tubular structure made of 20CrMo. 20CrMo has high weldability, good machinability and cold strain plasticity, and can conveniently weld the direct connector 4 to the cylinder cover 3 while ensuring that the welding is firm and reliable. The direct connector 4 made of 20CrMo is suitable for the transmission of high-pressure hydraulic oil.

[0029] Before the pressure test operation, the direct connector 4 is connected to a pipeline, one end of which is connected to the pressure test system. The pipeline is a hydraulic pipe to meet the needs of high-pressure oil transmission. The direct connector 4 is a quick-release connector, which can be easily disassembled and assembled with the pipeline and is flexible in operation and use.

[0030] The direct connector 4 is connected to the liquid inlet 5 , and the inner diameter of the direct connector 4 is larger than the aperture of the liquid inlet 5 .

[0031] In this embodiment, the inner thread of the cylinder cover 3 is connected to the supporting sleeve 2. The supporting sleeve 2 is a hollow structure that passes through from top to bottom. The material of the supporting sleeve 2 is the same as that of the cylinder cover 3, both made of 27SiMn, which meets the high-pressure test requirements.

[0032] In this embodiment, the direct connector 4, the liquid inlet 5 and the supporting sleeve 2 are correspondingly connected in the upper and lower parts.

[0033] The height of the supporting sleeve 2 is greater than that of the cylinder cover 3 , that is, after the supporting sleeve 2 and the cylinder cover 3 are connected, the lower end surface of the supporting sleeve 2 exceeds the lower end surface of the cylinder cover 3 , and the lower end of the supporting sleeve 2 protrudes from the cylinder cover 3 .

[0034] In order to facilitate the installation of the supporting sleeve 2, the outer contour cross-section of the lower end of the supporting sleeve 2 is prismatic to form a tightening section 10, and the side surface of the lower end of the supporting sleeve 2 is composed of multiple planes. Compared with the cylindrical surface, it is convenient to cooperate with disassembly and assembly tools, such as pipe wrenches, etc., to increase the contact area between the disassembly and assembly tools and the supporting sleeve 2, which greatly facilitates the disassembly and assembly of the supporting sleeve 2 and the cylinder cover 3.

[0035] In this embodiment, the supporting sleeve 2 includes an integrally formed sealed section 21 and a connecting section 22. The sealed section 21 and the connecting section 22 are connected up and down to form a stepped shape with a small upper part and a large lower part. The outer contour of the sealed section 21 is smooth, and the outer contour of the connecting section 22 is provided with a thread. The supporting sleeve 2 is connected to the cylinder cover 3 through the connecting section 22.

[0036] In order to ensure the sealing of the support sleeve 2 and the cylinder cover 3 during installation, a sealing ring 9 is provided between the joint surfaces of the support sleeve 2 and the cylinder cover 3 . Specifically, the sealing ring 9 is arranged between the joint surface of the sealing section 21 and the cylinder cover 3 .

[0037] A stepped mounting hole 6 is provided in the support sleeve 2 , and the mounting hole 6 passes through the sealing section and the connecting section 22 . The mounting hole 6 is stepped and has a larger top and smaller bottom. A bottom valve 7 is detachably connected to the mounting hole 6 .

[0038] Specifically, the step change portion of the mounting hole 6 forms a mounting shoulder 11 , the bottom valve 7 rests on the mounting shoulder 11 , the bottom valve 7 fits against the inner wall of the mounting hole 6 , and the lower end of the bottom valve 7 extends out of the mounting hole 6 .

[0039] In order to ensure the sealing of the bottom valve 7 and the supporting sleeve 2 during installation, a sealing ring 9 is also provided between the joint surface of the bottom valve 7 and the installation hole 6 .

[0040] In this embodiment, the liquid inlet 5 and the bottom valve 7 correspond to each other in upper and lower directions. There is a gap between the bottom valve 7 and the liquid inlet 5 to form an oil chamber 8. The oil chamber 8 is located in the mounting hole 6.

[0041] Specifically, the oil chamber 8 is disposed in the mounting hole 6 between the upper end of the bottom valve 7 and the liquid inlet 5 .

[0042] During the pressure test operation, this pressure test tool is placed on the test bench, and the bottom valve 7 to be pressure tested is installed into the mounting hole 6 of the supporting sleeve 2, and then the supporting sleeve 2 and the cylinder cover 3 are tightened and fixed; the pressure test system slowly introduces the hydraulic oil into the pipeline, and then enters the oil chamber 8 through the direct connector 4 and the liquid inlet 5 in turn. The oil chamber 8 is designed as a small-capacity chamber, which contains less oil and can reduce waste. The oil in the oil chamber 8 is injected into the bottom valve 7, and the status of the bottom valve 7 is observed.

[0043] Once the bottom valve 7 is opened, read the pressure gauge reading and compare it with the designed opening pressure to confirm whether the pressure of the bottom valve 7 meets the requirements. After the pressure test is completed, loosen the supporting sleeve 2 and remove it, and then take out the bottom valve 7, which improves the pressure test efficiency.

[0044] This pressure test tool is used to detect the opening pressure of the hydraulic support column bottom valve 7, so as to determine whether the adjusted opening pressure of the hydraulic support column bottom valve 7 meets the design requirements, and has strong practicality.

[0045] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. Hydraulic support column bottom valve pressure test tool, characterized by: It includes a pressure test cylinder sleeve (1) and a supporting sleeve (2). The pressure test cylinder sleeve (1) includes a cylinder cover (3) and a union head (4) arranged above the cylinder cover (3). The cylinder cover (3) is a hollow structure with a through lower end. The outer contour of the cylinder cover (3) is prismatic for easy fixation. A liquid inlet (5) is provided on the cylinder cover (3). The cylinder cover (3) is internally threaded with the supporting sleeve (2). The supporting sleeve (2) is a hollow structure with a through upper and lower end. The union head (4), the liquid inlet (5), and the supporting sleeve (2) are vertically corresponding and connected. The height of the supporting sleeve (2) is greater than the height of the cylinder cover (3). The cross-section of the lower end outer contour of the supporting sleeve (2) is prismatic to form a tightening section (10). The lower end face of the supporting sleeve (2) extends beyond the lower end face of the cylinder cover (3). A stepped mounting hole (6) is provided inside the supporting sleeve (2). A bottom valve (7) is detachably connected inside the mounting hole (6), and the bottom valve (7) fits against the inner wall of the mounting hole (6). The liquid inlet (5) and the bottom valve (7) are vertically corresponding. There is a gap between the bottom valve (7) and the liquid inlet (5) to form an oil cavity (8), and the oil cavity (8) is located inside the mounting hole (6).

2. The hydraulic support column bottom valve pressure testing tool according to claim 1 is characterized in that: The cylinder cover (3) is a hollow structure made of 27SiMn, and the cross-section of the cylinder cover (3) is an inverted "U" shape. The liquid inlet (5) is located in the middle above the cylinder cover (3).

3. The hydraulic support column bottom valve pressure testing tool according to claim 2 is characterized in that: The union head (4) is a tubular structure made of 20CrMo. The union head (4) is welded in the middle above the cylinder cover (3). The union head (4) and the liquid inlet (5) are connected, and the inner diameter of the union head (4) is greater than the aperture of the liquid inlet (5).

4. The hydraulic support column bottom valve pressure testing tool according to claim 1 is characterized in that: A sealing ring (9) is provided between the joint surface of the supporting sleeve (2) and the cylinder cover (3). The lower end of the bottom valve (7) extends out of the mounting hole (6), and a sealing ring (9) is also provided between the joint surface of the bottom valve (7) and the mounting hole (6).

5. The hydraulic support column bottom valve pressure testing tool according to claim 4 is characterized in that: The supporting sleeve (2) includes an integrally formed sealed section (21) and a connecting section (22). The sealed section (21) and the connecting section (22) are vertically connected and combined into a stepped shape with a smaller upper part and a larger lower part. The mounting hole (6) penetrates through the sealed section and the connecting section (22), and the mounting hole (6) is a stepped shape with a larger upper part and a smaller lower part.

6. The hydraulic support column bottom valve pressure testing tool according to claim 5 is characterized in that: The outer contour of the sealed section (21) is smooth, and the sealing ring (9) is arranged between the joint surface of the sealed section (21) and the cylinder cover (3). The outer contour of the connecting section (22) is provided with threads, and the supporting sleeve (2) is connected to the cylinder cover (3) through the connecting section (22).

7. The hydraulic support column bottom valve pressure testing tool according to claim 1 is characterized in that: The stepped change of the mounting hole (6) forms a mounting shoulder (11), and the bottom valve (7) abuts against the mounting shoulder (11). The oil cavity (8) is arranged in the mounting hole (6) between the upper end of the bottom valve (7) and the liquid inlet (5).

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