A two-stage hydraulic control check valve core assembly

Abstract

This utility model provides a two-stage hydraulically controlled check valve core assembly. The assembly is applied in the field of hydraulic control technology, particularly suitable for the hydraulic chamber locking control of hydraulic support jacks to maintain the working posture of the hydraulic support. The assembly comprises at least two stages. The first stage is a guide sleeve, which internally houses a spring, a large valve core, a small valve core, and a valve seat. The first and second stages are assembled as a single unit via interference fit or screw connection. The assembly also includes multiple sets of sealing rings and retaining rings, respectively disposed at mating points such as between the large valve core and the guide sleeve, and between the pressure sleeve and the push rod. The threaded sleeve also features side holes, an Allen wrench position, and a quick-connect fluid port. This design improves the concentricity and assembly stability of the hydraulically controlled check valve core, avoiding problems with loose threaded connections; it also increases unloading speed and maintenance convenience, reduces hydraulic shock, and enhances the overall sealing performance and maintainability of the product.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control technology, and in particular to a hydraulically controlled one-way valve core assembly. Background Technology

[0002] Hydraulic valves are fundamental components in electro-hydraulic control systems. By controlling hydraulic valves, the orderly operation of each jack on the hydraulic support can be achieved. Hydraulic check valves and two-way locks can lock one or both sides of the hydraulic chamber of the jack in a timely manner, so that the jack maintains the supporting force and thus maintains the working posture of the hydraulic support.

[0003] Under normal circumstances, a hydraulically controlled check valve is the same as a regular check valve, allowing fluid flow only in one direction and preventing flow in the opposite direction. When reverse flow is required, simply apply control pressure to the control port. The control piston, under the pressure, pushes open the check valve core, releasing the reverse blocking effect. Installing two hydraulically controlled check valve cores in the same valve body to control both the rodless and rod-side liquid chambers of the jack creates a two-way lock.

[0004] In the existing technology, Hongda Intelligent Machinery Co., Ltd. and Beijing Tiandimake Electro-hydraulic Control System Co., Ltd. have successively disclosed patents such as valve core assembly of hydraulic control check valve (201711018458.X), valve core assembly of hydraulic control check valve (201710841648.5), and valve core assembly / hydraulic control check valve and valve sleeve (202010215092.0). The above-mentioned patents have the following problems: poor concentricity of the valve core due to integral or multi-section processing, weak threaded connection, slow unloading time, poor maintainability, and large hydraulic shock. Summary of the Invention

[0005] This utility model provides a two-section hydraulic control check valve core assembly, which solves the problems of poor concentricity, weak threaded connection, slow unloading time, poor maintainability and large hydraulic shock caused by the single or multi-section processing of the existing hydraulic control check valve core, thereby improving the usability and maintainability of hydraulic control check valve products.

[0006] This utility model specifically discloses a two-stage hydraulically controlled check valve core assembly, which includes: The first section contains a spring, a large valve core, a small valve core, and a valve seat installed inside the guide sleeve. The large and small valve cores are reset by the spring. The second section has a push rod and a pressure sleeve installed inside the threaded sleeve. The pressure sleeve seals the push rod inside the threaded sleeve, allowing it to slide.

[0007] The first and second sections are either press-fitted together with an interference fit or connected together with screws.

[0008] Furthermore, on the right side of the push rod mounting hole, the screw sleeve is arranged with an Allen wrench position and a quick-connect liquid port.

[0009] Furthermore, a sealing ring is provided between the large valve core inside the guide sleeve and the guide sleeve.

[0010] Furthermore, a sealing ring is provided between the pressure sleeve and the push rod, and a side hole is provided on the screw sleeve to allow flow between the push rod cavity and the liquid inlet.

[0011] Furthermore, the pressure sleeve and the threaded sleeve are connected by threads.

[0012] A two-stage hydraulic control check valve, comprising a valve core assembly of any one of the above.

[0013] This utility model adopts a two-section structure instead of the multi-section or single-section structure in previously disclosed patents, avoiding problems such as difficult disassembly and maintenance, poor concentricity and consistency, and impact on product sealing performance. It uses only one spring for reset, resulting in a simple structure. The high-pressure side and the spring cavity are pressure-isolated, allowing for rapid unloading. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the valve core structure of a two-stage hydraulic control check valve core assembly provided by this utility model.

[0016] Figure 2 This is a schematic diagram of a two-stage hydraulic control check valve core assembly provided by this utility model.

[0017] Figure 3 This is a hydraulic schematic diagram of a two-stage hydraulic control check valve core assembly provided by this utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] This utility model provides a two-stage hydraulic control check valve core assembly. In this hydraulic control check valve core structure, the guide sleeve 7 is located on one side of the overall structure, providing guiding support for the internal components. A spring 2 is disposed between the guide sleeve 7 and the small valve core 3. The elastic force of the spring 2 acts on the small valve core 3, keeping it in a specific position. The small valve core 3 cooperates with the valve seat 4, which limits and seals the movement of the small valve core 3. The large valve core 5 works in conjunction with the small valve core 3 and other components to jointly realize the function of the hydraulic valve. A push rod 6 is connected to the large valve core 5 and other related components to transmit force or movement. A pressure sleeve 1 is installed near the large valve core 5 and other components, providing compression to the internal components. A threaded sleeve 8 is located on the other side of the overall structure, assembling and fixing the components through threaded connections to ensure the stability of the entire hydraulic valve structure. Various O-rings and retaining rings (such as parts 10, 11, 14, 15, 16, 17, 18, 19, etc.) are distributed at the mating points of various components, playing a sealing role to prevent hydraulic oil leakage and ensure the normal operation of hydraulic valves.

[0020] In one embodiment, combined with Figure 1 As can be seen, in this hydraulic control check valve core structure, the guide sleeve 7 is located on one side of the overall structure, providing guiding support for the internal components. The spring 2 is positioned between the guide sleeve 7 and the small valve core 3; the spring force of the spring 2 acts on the small valve core 3, maintaining it in a specific position. The small valve core 3 cooperates with the valve seat 4, which limits and seals the movement of the small valve core 3. The large valve core 5 works in conjunction with the small valve core 3 and other components to achieve the function of the hydraulic valve. The push rod 6 is connected to the large valve core 5 and other related components, used to transmit force or movement. The pressure sleeve 1 is installed near the large valve core 5 and other components, providing pressure for the internal components. The threaded sleeve 8 is located on the other side of the overall structure, assembling and fixing the components through threaded connections to ensure the stability of the entire hydraulic valve structure. Various O-rings and retaining rings (such as parts 10, 11, 14, 15, 16, 17, 18, 19, etc.) are distributed at the mating points of various components, playing a sealing role to prevent hydraulic oil leakage and ensure the normal operation of hydraulic valves.

[0021] In yet another embodiment, combined with Figure 2 and Figure 3It can be seen that, in the initial state, with the help of the spring force and the pressure generated by the liquid in the locking chamber, the valve core and the valve seat form a sealing line through close contact, separating the liquid ports A, B1, and B2 from each other, and the working medium cannot flow from liquid ports B1 and B2 to liquid port A; when the pressure generated at port K pushes the push rod, and the force generated is sufficient to overcome the spring force and the pressure of the liquid at port B, the large valve core will separate from the valve seat, and at this time the working medium can flow unidirectionally from liquid port A to liquid ports B1 and B.

[0022] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A two-stage hydraulically controlled check valve core assembly, characterized in that, include: The first section contains a spring, a large valve core, a small valve core, and a valve seat installed inside the guide sleeve. The large and small valve cores are reset by the spring. The second section has a push rod and a pressure sleeve installed inside the screw sleeve. The pressure sleeve seals the push rod inside the screw sleeve and allows it to slide. The first and second segments are pressed together with an interference fit.

2. The valve core assembly of a two-stage hydraulically controlled check valve according to claim 1, characterized in that, On the right side of the push rod mounting hole, the position of the hex wrench and the quick-connect liquid port are arranged in sequence on the screw sleeve.

3. The valve core assembly of a two-stage hydraulically controlled check valve according to claim 1, characterized in that, A sealing ring is provided between the large valve core inside the guide sleeve and the guide sleeve.

4. The valve core assembly of a two-stage hydraulically controlled check valve according to claim 1, characterized in that, A sealing ring is provided between the pressure sleeve and the push rod, and a side hole is provided on the screw sleeve to allow flow between the push rod cavity and the liquid inlet.

5. The valve core assembly of a two-stage hydraulically controlled check valve according to claim 1, characterized in that, The pressure sleeve and the threaded sleeve are connected by threads.

6. The valve core assembly of a two-stage hydraulically controlled check valve according to claim 1, characterized in that, The first segment and the second segment are connected together by screws.

7. A two-stage hydraulic control check valve, comprising a valve core assembly as claimed in any one of claims 1 to 5.

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