Hydraulic control one-way valve for upper cavity of stand column

Abstract

The hydraulic control one-way valve comprises a valve body and a valve element assembly, the valve element assembly comprises a first ejector rod, the valve body is connected with a thrust mechanism, and the thrust mechanism is arranged to be used for exerting pressure enabling the first ejector rod to move in the axial direction on the first ejector rod. The thrust mechanism comprises an outer shell, a second ejector rod and a connector, the second ejector rod is movably arranged in the outer shell and makes contact with the first stress face on the first ejector rod, the connector is arranged on the outer shell and used for being connected with a hydraulic pipeline, the second stress face on the second ejector rod faces the connector, and the area of the first stress face is smaller than that of the stress face of the second ejector rod. According to the stand column upper cavity hydraulic control one-way valve, the second ejector rod with the larger stress face is arranged, the control pressure can be reduced, the one-way valve can be opened under the small control pressure, a hydraulic power source with higher power does not need to be matched, and system energy consumption and operation cost can be reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of hydraulic support for fully mechanized coal mining. Specifically, this utility model relates to a hydraulically controlled one-way valve for the upper cavity of a column. Background Technology

[0002] As coal mining technology advances towards higher and ultra-high mining heights, the support height of hydraulic supports is also continuously increasing, from 5.5m to 7m and 8.8m, and now to the latest 10m. The strength and difficulty of support are increasing, requiring hydraulic support column jacks to have a large flow rate to meet the requirements of rapid lowering, moving, and raising of the support. Simultaneously, it is also necessary to reduce pressure shock and vibration when the column jacks are handling large flow rates. In recent years, with the gradual improvement of coal mining operations, the application of large supports has become increasingly widespread. Large supports urgently require high-flow-rate, reliable hydraulic control check valves for controlling their raising and lowering.

[0003] For example, patent document CN107514273A discloses a column-mounted hydraulic control check valve, which includes a valve body, a threaded sleeve, a valve sleeve, a push rod, a large valve core and a small valve core disposed inside the valve sleeve, an inlet sleeve sleeved on the push rod and located between the threaded sleeve and the valve sleeve, and a valve seat disposed inside the inlet sleeve and used to cooperate with the large valve core to achieve a seal. The valve seat and the large valve core are made of metal.

[0004] The existing column-operated hydraulic check valve uses a push rod that, under hydraulic pressure, can push the large and small valve cores towards the inside of the valve sleeve, causing the large valve core to separate from the valve seat and thus opening the check valve. However, the push rod has a small force-bearing surface and requires a relatively large control pressure. Higher control pressure means that a higher-power hydraulic power source is needed, which increases the system's energy consumption and operating costs.

[0005] An improved column-mounted hydraulic check valve is provided, particularly regarding how to reduce control pressure. Utility Model Content

[0006] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention provides a hydraulically controlled check valve for the upper cavity of a column, with the purpose of improving operational reliability.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a column upper cavity hydraulic control check valve, including a valve body and a valve core assembly, the valve core assembly including a first push rod, the valve body being connected to a thrust mechanism, the thrust mechanism being configured to apply pressure to the first push rod to make it move axially, the thrust mechanism including an outer shell, a second push rod movably disposed inside the outer shell and in contact with a first force-bearing surface on the first push rod, and a connector disposed on the outer shell and used for connection to a hydraulic pipeline, the second force-bearing surface on the second push rod facing the connector, and the area of ​​the first force-bearing surface being smaller than the area of ​​the force-bearing surface of the second push rod.

[0008] The second push rod includes a first push part and a second push part connected to each other. The diameter of the first push part is smaller than the diameter of the second push part, and the second push part is located between the first push part and the connector.

[0009] The length of the first pushing part is greater than the length of the second pushing part.

[0010] The outer casing includes a first body portion and a first protrusion connected to each other. The first protrusion is connected to the valve body, and the first body portion is connected to the connector. The second pushing portion is located in the inner cavity of the first body portion, and the first pushing portion passes through the first protrusion.

[0011] The first protrusion is threadedly connected to the valve body, and the first body portion is threadedly connected to the connector.

[0012] The first body part has a regular hexagonal structure.

[0013] The connector includes a second body portion and a second protrusion that are connected to each other, and the second body portion and the first body portion are threadedly connected.

[0014] The column-mounted hydraulic check valve of this invention can reduce the control pressure by setting a second push rod with a larger force-bearing surface. The check valve can be opened under a relatively small control pressure, eliminating the need for a higher-power hydraulic power source and reducing system energy consumption and operating costs. Attached Figure Description

[0015] This manual includes the following figures, which illustrate the following:

[0016] Figure 1 This is a cross-sectional view of the column upper cavity hydraulic control check valve of this utility model;

[0017] Figure 2 This is a cross-sectional view of the valve core assembly;

[0018] Figure 3 This is a sectional view of the second push rod;

[0019] Figure 4This is a sectional view of the outer shell;

[0020] Figure 5 This is a side view of the outer casing;

[0021] Figure 6 This is a cross-sectional view of the connector;

[0022] The following are labeled in the diagram: 1. First push rod; 2. Second spring; 3. Inlet sleeve; 4. Valve seat; 5. Large valve core; 6. Small valve core; 7. First spring; 8. Screw sleeve; 9. Valve body; 10. Second push rod; 11. Outer shell; 12. Connector; 13. First push part; 14. Second push part; 15. First body part; 16. First protrusion; 17. Second body part; 18. Second protrusion. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of this utility model, and to facilitate its implementation.

[0024] It should be noted that in the following embodiments, the terms "first" and "second" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution, but are merely for the convenience of description.

[0025] like Figures 1 to 6 As shown, this utility model provides a column-mounted upper cavity hydraulic control check valve, including a valve body and a valve core assembly. The valve core assembly includes a threaded sleeve, a first push rod, a first spring, a second spring, a large valve core and a small valve core disposed inside the threaded sleeve, an inlet valve sleeve sleeved on the first push rod and threadedly connected to the threaded sleeve, and a valve seat disposed inside the inlet valve sleeve and used to cooperate with the large valve core to achieve a seal. The threaded sleeve, large valve core, small valve core, inlet valve sleeve, valve seat, first spring, and second spring constitute a cartridge-type valve core assembly. The valve core assembly is an integral structure. The inlet valve sleeve is sleeved on the first push rod, and the large and small valve cores are disposed inside the threaded sleeve. The first push rod is used to apply axial pressure to the large and small valve cores. The first push rod can push the large and small valve cores to move towards the interior of the threaded sleeve, causing the large valve core to separate from the valve seat, thereby opening the safety valve. The threaded sleeve is threaded to the valve body. The threaded sleeve is used to limit the movement of the large valve core and the small valve core in the axial direction. A retaining ring is set in the inner cavity of the inlet valve sleeve to limit the movement of the first push rod in the axial direction.

[0026] like Figure 1As shown, the valve seat is located inside the inlet valve sleeve, and is axially clamped and fixed by the inlet valve sleeve and the threaded sleeve. The valve seat has a circular structure and is coaxially arranged with the inlet valve sleeve and the threaded sleeve. The center of the valve seat has a central hole to accommodate the large valve core; the diameter of the central hole is smaller than the outer diameter of the large valve core. Both the large valve core and the valve seat are made of metal, specifically 3Cr13. The large valve core and valve seat are connected by a hard seal, enhancing sealing performance. Compared to soft material seals, hard seals not only provide better sealing performance but also withstand ultra-high pressure, resulting in a longer service life for the column-operated hydraulic check valve. The small valve core is also made of metal, and the valve seat, large valve core, and small valve core are made of the same material.

[0027] like Figures 1 to 6 As shown, the valve body is connected to a thrust mechanism, which is configured to apply pressure to the first push rod to move it axially. The thrust mechanism includes a housing, a second push rod movably disposed inside the housing and in contact with a first force-bearing surface on the first push rod, and a connector disposed on the housing for connection to a hydraulic pipeline. The connector guides hydraulic oil into the inner cavity of the housing to push the second push rod to move. The second force-bearing surface on the second push rod faces the connector, and the area of ​​the first force-bearing surface is smaller than the area of ​​the force-bearing surface of the second push rod. The first force-bearing surface is one end face of the first push rod in the axial direction, and is a plane perpendicular to the axis of the first push rod. The second force-bearing surface is one end face of the second push rod in the axial direction, and is a plane perpendicular to the axis of the second push rod. The housing, connector, first push rod, and second push rod are coaxially arranged.

[0028] like Figures 1 to 4As shown, the second push rod includes a first pushing part and a second pushing part connected together. The diameter of the first pushing part is smaller than the diameter of the second pushing part, and the second pushing part is located between the first pushing part and the connector. The length of the first pushing part is greater than the length of the second pushing part. One end of the first pushing part along its length is fixedly connected to the second pushing part, and the other end along its length contacts the first force-bearing surface. The outer shell includes a first body part and a first protrusion connected together. The first protrusion is connected to the valve body, and the first body part is connected to the connector. The second pushing part is located in the inner cavity of the first body part, and the first pushing part passes through the first protrusion. The first protrusion is threadedly connected to the valve body, and an external thread is provided on the outer circumference of the first protrusion. The first body part is threadedly connected to the connector, and an internal thread is provided on the first body part. The first body part has an open end and a hollow interior. The outer diameter of the second pushing part is the same as the inner diameter of the first body part. The first protrusion has an open end and a hollow interior. The outer diameter of the first pushing part is the same as the inner diameter of the first protrusion. The length of the first body part is greater than the length of the first protrusion. A sealing ring is provided between the first protrusion and the valve body to achieve a seal between the first protrusion and the valve body. After passing through the central hole of the first protrusion, the first pushing part can be inserted into the inner cavity of the liquid inlet valve sleeve to push the first push rod to move.

[0029] like Figure 1 and Figure 5 As shown, in this embodiment, the first body part is located outside the valve body, and the end face of the first body part is in contact with the outer surface of the valve body. The first body part has a regular hexagonal structure, forming an external hexagonal screw structure. The first body part is used to allow tools to be fitted during assembly, which facilitates the assembly between the outer shell and the valve body.

[0030] like Figure 1 and Figure 6 As shown, the connector includes a second body portion and a second protrusion connected to each other, with the second body portion and the first body portion being threadedly connected. The second protrusion is used to connect to a hydraulic pipeline, and the second body portion has an external thread on its outer circumference. Both the second protrusion and the second body portion are open at both ends and hollow internally, with the second body portion located between the second pushing portion and the second protrusion. A sealing ring is provided between the second body portion and the first body portion to achieve a seal between them.

[0031] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A column-mounted upper-cavity hydraulically controlled check valve, comprising a valve body and a valve core assembly, the valve core assembly including a first push rod, characterized in that: The valve body is connected to the thrust mechanism, which is configured to apply pressure to the first push rod to make it move axially. The thrust mechanism includes an outer shell, a second push rod that is movably disposed inside the outer shell and contacts the first force-bearing surface on the first push rod, and a connector disposed on the outer shell and used to connect to a hydraulic pipeline. The second force-bearing surface on the second push rod faces the connector, and the area of ​​the first force-bearing surface is smaller than the area of ​​the force-bearing surface of the second push rod.

2. The column upper chamber hydraulic control check valve according to claim 1, characterized in that: The second push rod includes a first push part and a second push part connected to each other. The diameter of the first push part is smaller than the diameter of the second push part, and the second push part is located between the first push part and the connector.

3. The column upper chamber hydraulic control check valve according to claim 2, characterized in that: The length of the first pushing part is greater than the length of the second pushing part.

4. The column upper chamber hydraulic control check valve according to claim 2, characterized in that: The outer casing includes a first body portion and a first protrusion connected to each other. The first protrusion is connected to the valve body, and the first body portion is connected to the connector. The second pushing portion is located in the inner cavity of the first body portion, and the first pushing portion passes through the first protrusion.

5. The column upper cavity hydraulic control check valve according to claim 4, characterized in that: The first protrusion is threadedly connected to the valve body, and the first body portion is threadedly connected to the connector.

6. The column upper cavity hydraulic control check valve according to claim 5, characterized in that: The first body part has a regular hexagonal structure.

7. The column upper cavity hydraulic control check valve according to claim 5, characterized in that: The connector includes a second body portion and a second protrusion that are connected to each other, and the second body portion and the first body portion are threadedly connected.

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