Electro-hydraulic control reversing valve

Abstract

The utility model discloses an electro-hydraulic control reversing valve which comprises a valve body and a valve element assembly, the valve element assembly comprises a threaded sleeve and a liquid return valve sleeve, the threaded sleeve is in threaded connection with the valve body, the valve element assembly comprises a connecting mechanism, and the connecting mechanism comprises a connecting piece and a limiting piece. An inlet hole allowing the limiting piece to be embedded and a first containing groove allowing the connecting pieces to be embedded are formed in the threaded sleeve, a second containing groove allowing the connecting pieces to be embedded is formed in the liquid return valve sleeve, the limiting piece is used for limiting the connecting pieces, the connecting pieces are multiple, and the first containing groove and the second containing groove are annular grooves. According to the electro-hydraulic control reversing valve, in the assembling process of the valve element assembly and the valve body and the disassembling process of the valve element assembly and the valve body, the threaded sleeve can rotate around the axis of the threaded sleeve relative to the liquid return valve sleeve, the liquid inlet valve sleeve and the liquid return valve sleeve are not prone to being separated, and the reliability of connection between the liquid return valve sleeve and the liquid inlet valve sleeve can be improved; the valve element assembly and the valve body are convenient to disassemble, and convenience is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of hydraulic supports for fully mechanized coal mining. Specifically, this utility model relates to an electro-hydraulic directional valve. Background Technology

[0002] In the context of coal mine fully mechanized mining becoming increasingly automated and efficient, high-extraction, high-resistance supports are becoming more common. Correspondingly, control valves are evolving from low-flow-rate valves to medium- and high-flow-rate valves. In the coal mining machinery industry, directional control valves are also known as control valves or operating valves. In the hydraulic system of hydraulic supports, directional control valves control the direction of fluid flow, enabling different actions such as lifting, pushing, and pulling of the hydraulic support.

[0003] Currently, directional control valves consist of a valve body and a valve core assembly. The valve core assembly includes a threaded sleeve and a return valve sleeve, which are threaded together. The threaded sleeve and valve body are also threaded together, with threads on both the outer and inner surfaces of the threaded sleeve. During disassembly of this valve core assembly from the valve body, significant frictional resistance arises due to the external sealing ring and the pressure from the valve body's inner bore. This frictional resistance can cause the return valve sleeve to unscrew the threaded sleeve, preventing the valve core assembly from being completely removed from the valve body.

[0004] Chinese Patent Application No. 201020520768.9 discloses a self-controlled two-position four-way directional valve, including a valve body with an inlet and a return port on the upper side and a liquid port on the lower side. A positioning sleeve is installed at one end of the valve body. The valve body contains multiple valve sleeves, each containing a sliding valve core. The valve sleeves have through holes that communicate with the inlet, return, and lower liquid port respectively. The valve cores have internal cavities that communicate with the through holes of the valve sleeves respectively. A spring is installed at one end of the valve core, and a pressure regulating valve seat is located in the valve body at the other end. The pressure regulating valve seat has a damping hole and contains a pressure regulating valve core and an O-ring seal. A pressure regulating valve sleeve is installed in the outer valve body. One end of the pressure regulating valve sleeve has a hole and contains a spring sleeve, a pressure regulating spring, a pressure regulating screw, and a sealing plug.

[0005] An electro-hydraulic directional valve is provided, particularly concerning the ease of disassembly of the valve core assembly and the valve body. Utility Model Content

[0006] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides an electro-hydraulic directional valve, the purpose of which is to facilitate the disassembly of the valve core assembly and the valve body, thereby improving convenience.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: it includes a valve body and a valve core assembly. The valve core assembly includes a threaded sleeve and a return valve sleeve. The threaded sleeve is threadedly connected to the valve body. The valve core assembly includes a connecting mechanism, which includes a connecting member and a limiting member. The threaded sleeve is provided with an inlet hole for the limiting member to be inserted and a first receiving groove for the connecting member to be inserted. The return valve sleeve is provided with a second receiving groove for the connecting member to be inserted. The limiting member is configured to limit the connecting member. Multiple connecting members are provided. The first receiving groove and the second receiving groove are annular grooves.

[0008] The connector is spherical, and the cross-sections of the first and second receiving grooves are semi-circular.

[0009] The limiting member is a screw that is threadedly connected to the screw sleeve, and the entry hole is provided with an internal thread.

[0010] One inlet hole is provided, and the second receiving groove is an annular groove extending along the entire circumference on the outer circular surface of the return valve sleeve.

[0011] The return valve sleeve includes a body portion and a protrusion portion connected to each other. The outer diameter of the body portion is larger than the outer diameter of the protrusion portion. The screw sleeve is provided with a first screw hole and a mounting groove for the protrusion portion to be inserted.

[0012] The first screw hole has a hexagonal hole inside.

[0013] The protrusion is provided with a second screw hole, and the second screw hole has a hexagonal hole inside.

[0014] In the electro-hydraulic directional valve of this invention, during the assembly and disassembly of the valve core assembly and valve body, the threaded sleeve can rotate around its axis relative to the return valve sleeve, making it difficult for the inlet valve sleeve and the return valve sleeve to separate. This improves the reliability of the connection between the return valve sleeve and the inlet valve sleeve, facilitates the disassembly of the valve core assembly and valve body, and enhances convenience. 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 valve core assembly;

[0017] Figure 2 This is a schematic diagram of the structure of the electro-hydraulic directional valve of this utility model;

[0018] Figure 3 This is a side view of the threaded sleeve;

[0019] Figure 4 This is a sectional view of the threaded sleeve;

[0020] Figure 5 This is a side view of the return valve sleeve;

[0021] Figure 6 This is a sectional view of the return valve sleeve;

[0022] The following are marked in the diagram: 1. Screw sleeve; 2. Return valve sleeve; 3. Piston; 4. Valve core; 5. Valve seat; 6. Sealing ring; 7. Elastic element; 8. Inlet valve sleeve; 9. Limiting element; 10. Connecting element; 11. Inlet hole; 12. Second receiving groove; 13. Body part; 14. Protrusion; 15. First screw hole; 16. Second screw hole; 17. Mounting groove; 18. First receiving groove. 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 an electro-hydraulic directional valve, including a valve body and a valve core assembly, with an electromagnetic pilot valve mounted on the valve body. The valve core assembly includes a threaded sleeve 1, a return valve sleeve 2, an inlet valve sleeve 8 connected to the return valve sleeve 2, a valve core movably disposed within the inlet valve sleeve 8, a piston 3 movably disposed within the return valve sleeve 2 and fitted onto the valve core, and a valve seat 5 sandwiched between the inlet valve sleeve 8 and the return valve sleeve 2 and cooperating with the valve core to achieve a seal. The threaded sleeve 1 is threadedly connected to the valve body. The valve core assembly also includes a connecting mechanism, which includes a connector 10 and a limiting member 9. The threaded sleeve 1 has an inlet hole 11 for the limiting member 9 to be inserted and a first receiving groove 18 for the connector 10 to be inserted. The return valve sleeve 2 has a second receiving groove 12 for the connector 10 to be inserted. The limiting member 9 is configured to limit the connection member 10. Multiple connectors 10 are provided. The first receiving groove 18 and the second receiving groove 12 are annular grooves.

[0026] Specifically, such as Figure 1 and Figure 2 As shown, multiple valve core assemblies are provided, and multiple valve chambers are provided in the valve body. Each valve chamber of the valve body is equipped with a valve core assembly with the same structure, and the valve body is provided with multiple working ports.

[0027] like Figure 1As shown, the return valve sleeve 2 is located between the inlet valve sleeve 8 and the threaded sleeve 1, and the inlet valve sleeve 8 and the return valve sleeve 2 are threadedly connected. Sealing rings for contacting the inner circular surface of the valve body are provided on both the inlet valve sleeve 8 and the return valve sleeve 2. One end of the valve core is inserted into the piston 3, and the other end passes through the guide hole at the end of the return valve sleeve 2 and is then inserted into the inner cavity of the inlet valve sleeve 8. One end of the inlet valve sleeve 8 is inserted into the return valve sleeve 2, and the inlet valve sleeve 8 and the return valve sleeve 2 are threadedly connected, forming an integral insert structure for the valve core assembly. The valve seat 5 is located in the inlet valve sleeve 8 and is fitted onto the valve core.

[0028] like Figure 1 As shown, the valve seat 5 is a ring-shaped structure made of metal. The piston 3 is adjacent to the valve seat 5. The metal valve seat 5, together with the valve core and piston 3, achieves a hard seal, enhancing the sealing performance of the directional valve. The valve seat 5 is installed in one open end of the inlet valve sleeve 8 and is tightly fitted with it. The valve seat 5 and piston 3 are made of 9Cr18, a high-carbon, high-chromium martensitic stainless steel with excellent corrosion resistance. It contains approximately 18% chromium and 0.9% carbon. Chromium easily forms a dense film on the metal surface, effectively preventing corrosive media (such as moisture and acidic substances in hydraulic oil) from contacting the metal substrate. As precision moving parts, the valve seat and piston are prone to surface corrosion and accelerated wear after contact with corrosive media. The corrosion resistance of 9Cr18 can significantly extend the service life of components under harsh working conditions. Furthermore, 9Cr18 has good chemical stability with hydraulic oil and will not react chemically with additives in the oil (such as anti-wear agents and antioxidants), thus avoiding material corrosion or oil contamination.

[0029] like Figure 1 , Figures 3 to 6 As shown, the connecting mechanism is configured to prevent relative axial movement between the threaded sleeve 1 and the return valve sleeve 2, while allowing relative rotation between them. The inlet valve sleeve 8 is threaded to one end of the return valve sleeve 2 along its length. The threaded sleeve 1 is installed at the other end of the return valve sleeve 2 along its length via the connecting mechanism. The threaded sleeve 1 is located in a threaded hole on the end face of the valve body, facilitating the disassembly and assembly of the valve core assembly and the valve body. Disassembly and assembly are performed by rotating the threaded sleeve 1. By tightening the threaded sleeve 1, the valve core assembly can be completely pulled out of the valve cavity of the valve body, completing the disassembly of the valve core assembly without separating the threaded sleeve 1 from the return valve sleeve 2. After the threaded sleeve 1 is fully screwed into the valve cavity of the valve body, the installation of the valve core assembly is completed.

[0030] During the assembly and disassembly of the valve core assembly and valve body, the threaded sleeve 1 can rotate around its axis relative to the return valve sleeve 2. Compared to the prior art reversing valve where the return valve sleeve 2 and valve body are connected by threads, the connection mechanism can avoid loosening between the return valve sleeve 2 and the inlet valve sleeve 8 caused by frictional resistance generated by the sealing ring on the outside of the inlet valve sleeve 8 and the inner wall of the valve body, thus improving the reliability of the connection between the return valve sleeve 2 and the inlet valve sleeve 8. The threaded sleeve 1 has an inlet hole 11 for accommodating the connection mechanism, and the return valve sleeve 2 has a second receiving groove 12 for embedding the connection mechanism. The inlet hole 11 is a through hole radially extending on the side wall of the threaded sleeve 1, and there is only one inlet hole 11. The second receiving groove 12 is an annular groove extending along the entire circumference on the outer circumferential surface of the return valve sleeve 2. The length direction of the inlet hole 11 is perpendicular to the axis of the threaded sleeve 1. The inlet hole 11 is a round hole. When the valve core assembly is assembled, the connector 10 enters the first receiving groove 18 and the second receiving groove 12 through the inlet hole 11.

[0031] like Figure 1 , Figures 3 to 6 As shown, the connector 10 is spherical, and the diameter of the inlet hole 11 is larger than the diameter of the connector 10. The cross-section of the first receiving groove 18 and the second receiving groove 12 is semi-circular. The limiting member 9 is a screw inserted into the inlet hole 11 and threadedly connected to the threaded sleeve 1. The inlet hole 11 is provided with an internal thread. The limiting member 9 is screwed into the inlet hole 11 and limits the connector 10 along the length direction of the inlet hole 11. The limiting member 9 contacts one of the connectors 10, so that part of the connector 10 is embedded in the first receiving groove 18 and the other part is embedded in the second receiving groove 12. This enables the connection between the threaded sleeve 1 and the return valve sleeve 2, and allows relative rotation between the threaded sleeve 1 and the return valve sleeve 2 without separation. The first receiving groove 18 and the second receiving groove 12 are circular grooves, and the connecting member 10 is a spherical part that matches the first receiving groove 18 and the second receiving groove 12. This can increase the efficiency of the rotation of the return valve sleeve 2 and reduce the frictional resistance. During the rotation of the return valve sleeve 2, the connecting member 10 can slide circumferentially in the second receiving groove 12.

[0032] like Figure 1 , Figures 3 to 6As shown, the return valve sleeve 2 includes a body portion 13 and a protrusion 14 connected to each other. The body portion 13, the protrusion 14, the threaded sleeve 1, and the inlet valve sleeve 8 are coaxially arranged. The outer diameter of the body portion 13 is larger than the outer diameter of the protrusion 14. The threaded sleeve 1 is provided with a first screw hole 15 and a mounting groove 17 for the protrusion 14 to be inserted. The size of the mounting groove 17 is larger than the size of the first screw hole 15. The first receiving groove 18 is an annular groove extending circumferentially on the inner circular surface of the mounting groove 17. The inlet hole communicates with the first receiving groove 18. The first screw hole 15 is an internal hexagonal hole. The first screw hole 15 is provided through the center of the threaded sleeve 1 along the axial direction of the threaded sleeve 1. The internal hexagonal hole is a regular hexagonal hole. The first screw hole 15 is used to allow tools to be inserted during assembly, which facilitates the assembly between the valve core assembly and the valve body. Appropriate tools can be used according to the size of the operating space.

[0033] like Figure 1 , Figures 3 to 6 As shown, the protrusion 14 is fixedly connected to the closed end of the body 13. The other end of the body 13 is an open end, which is threadedly connected to the end of the inlet valve sleeve 8. The piston 3 is located in the inner cavity of the body 13. The end face of the body 13 fits against the end face of the threaded sleeve 1. The outer diameter of the body 13 is basically the same as the outer diameter of the threaded sleeve 1. The second receiving groove 12 is an annular groove provided on the outer circular surface of the protrusion 14. A second screw hole 16 is provided on the protrusion 14. The second screw hole 16 is provided at the center of the end face of the protrusion 14 facing the threaded sleeve 1. The second screw hole 16 is an internal hexagonal hole. The second screw hole 16 is used to allow tools to be inserted during assembly, which facilitates the assembly of the return valve sleeve 2.

[0034] 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. An electro-hydraulic directional control valve comprising a valve body and a spool assembly, the spool assembly comprising a screw sleeve and a return valve sleeve, the screw sleeve being threadedly connected to the valve body, characterized in that: The valve core assembly includes a connecting mechanism, which includes a connector and a limiting member. The threaded sleeve is provided with an inlet hole for the limiting member to be inserted and a first receiving groove for the connector to be inserted. The return valve sleeve is provided with a second receiving groove for the connector to be inserted. The limiting member is configured to limit the connector. Multiple connectors are provided. The first receiving groove and the second receiving groove are annular grooves.

2. An electro-hydraulic counterbalance valve according to claim 1, characterised in that: The connector is spherical, and the cross-sections of the first and second receiving grooves are semi-circular.

3. The electro-hydraulic pilot reversing valve according to claim 1, characterized in that: The limiting member is a screw that is threadedly connected to the screw sleeve, and the entry hole is provided with an internal thread.

4. An electro-hydraulic counterbalance valve according to any one of claims 1 to 3, wherein: One inlet hole is provided, and the second receiving groove is an annular groove extending along the entire circumference on the outer circular surface of the return valve sleeve.

5. An electro-hydraulic counterbalance valve according to any one of claims 1 to 3, wherein: The return valve sleeve includes a body portion and a protrusion portion connected to each other. The outer diameter of the body portion is larger than the outer diameter of the protrusion portion. The screw sleeve is provided with a first screw hole and a mounting groove for the protrusion portion to be inserted.

6. An electro-hydraulic counterbalance valve according to claim 5, wherein: The first screw hole has a hexagonal hole inside.

7. The electro-hydraulic pilot reversing valve according to claim 5, characterized in that: The protrusion is provided with a second screw hole, and the second screw hole has a hexagonal hole inside.

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