Bottom lifting pressure retaining valve for hydraulic support

Abstract

A valve cavity is formed in a valve body, a one-way lock valve element forming a one-way valve with the valve body is arranged at the first end of the valve cavity in a sliding mode through a compression spring, and the compression spring provides spring force for the one-way lock valve element to move to the matched opening and closing position of the one-way lock valve element and the valve body. A liquid inlet and a liquid outlet are formed in the two sides of the matched opening and closing position of the one-way lock valve element and the valve body on the valve body respectively, the liquid inlet is close to the second end, the liquid outlet is close to the first end, a control mechanism valve element is arranged at the second end of the valve cavity in a sealed and sliding mode, and a pressure adjusting spring is pressed between the second end of the control mechanism valve element and the valve body. When the pressure of the pressure adjusting spring at the liquid inlet is smaller than the pressure set by adjusting the pressure adjusting spring, the valve element of the control mechanism is jacked by the pressure adjusting spring to move to the first end and jack the valve element of the one-way valve lock open, and the valve body is matched with the pressure adjusting spring in a jacked mode through a position-adjustable positioning mechanism assembled in the valve body. When the support base is applied to a support, the support base can return to a normal state after bottom lifting is finished, and abnormal postures cannot be caused.

Description

Technical Field

[0001] The utility model relates to a hydraulic valve, in particular to a bottom-lifting and pressure-maintaining valve for a hydraulic support, belonging to a hydraulic valve applied to an underground support. Background Art

[0002] At present, the bottom lifting cylinder of the support of the underground fully mechanized mining working face uses a conventional one-way lock or a one-way valve to control the extension and retraction of the bottom lifting cylinder.

[0003] When the support is being pulled: the column is lowered, the bottom lifting cylinder extends to lift the bottom of the support base, and the push cylinder retracts to move the support toward the coal mine. After the movement is completed, liquid enters the lower cavity of the column to lift the column and simultaneously controls the bottom lifting one-way lock control port to open the valve string, and the bottom lifting cylinder retracts to return the support base to the center. The column raising is linked to the bottom lifting one-way lock control port. When the column raising control valve string is abnormal, the bottom lifting one-way lock will be affected by the linkage, and the retraction of the bottom lifting cylinder will be affected, making it impossible for the support base to return to the center position, resulting in an abnormal base posture. Utility Model Content

[0004] The purpose of the utility model is to provide a bottom lifting and pressure maintaining valve for a hydraulic support, so as to solve the problem in the prior art that the support base cannot be straightened, resulting in abnormal base posture.

[0005] When unclamping said control button, under the effect of the compression spring and the bubble holding vessel internal pressure that shaves, combine closely in the interior edge of valve gap and sealing load chamber, and closure material is sealed on the valve core, and seals are sealed on the valve core.

[0006] The positioning mechanism is a threaded plug screwed into the valve cavity of the valve body, and a hexagonal structure for cooperating with a screwing tool is provided on the end of the second end of the threaded plug.

[0007] The first end of the threaded plug is provided with a stabilizing boss which extends into the pressure regulating spring.

[0008] The control mechanism valve core is pressed together with the pressure regulating spring through a stabilizing block. The second end of the stabilizing block has a stabilizing protrusion that extends into the pressure regulating spring. The first end of the stabilizing block is concavely provided with a pit for the second end of the control mechanism valve core to extend into.

[0009] The valve body is provided with a safety port which is communicated with the valve cavity and used for communicating with the overflow valve.

[0010] The one-way lock valve core is provided with a communication channel extending to both ends of the one-way lock valve core, and a sealing member is provided between the first end of the one-way lock valve core and the valve body.

[0011] The one-way lock valve core is a stepped shaft with a large diameter at the second end and a small diameter at the first end. The compression spring presses on the step surface of the one-way lock valve core. The spring cavity between the one-way lock valve core and the valve body that accommodates the compression spring is connected to the liquid outlet through a pressure balance hole opened on the one-way lock valve core.

[0012] The present invention is provided with a control mechanism valve core. The control mechanism valve core will force open the one-way valve under the action of a pressure regulating spring. When the pressure of the liquid inlet is greater than the set pressure, the liquid pressure will push the control mechanism valve core to overcome the pressure of the pressure regulating spring and leave the one-way lock valve core that forms a one-way valve together with the valve body. The one-way valve exists as an ordinary one-way valve. When the liquid inlet flows, the liquid inlet is circulated. Once the liquid inlet is no longer flowing, the one-way valve is closed. Once the pressure of the liquid inlet is less than the set pressure, the control mechanism valve core will force the one-way valve to open. In this way, the one-way valve used in the prior art is replaced with the present invention. After the support is pulled, the liquid inlet of the present invention will no longer flow into the liquid. When the pressure of the liquid inlet drops below the set pressure, the control mechanism valve core is moved toward the first end by the spring force of the pressure regulating spring, contacts the one-way lock valve core and opens the one-way lock valve core. Under the action of the deadweight of the support, the bottom lifting cylinder is retracted and oil is returned through the opened one-way valve. The support base stops lifting and returns to a normal state without causing abnormal posture. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments:

[0014] Figure 1 This is the initial state of the embodiment of the present utility model;

[0015] Figure 2 This is the liquid-intake state of the embodiment of the utility model;

[0016] Figure 3 This is the pressure-maintaining state of the embodiment of the present utility model;

[0017] Figure 4 This is the liquid return state of the embodiment of the utility model;

[0018] Figure 5 for Figure 1 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0019] In order to make the technical objectives, technical solutions, and beneficial effects of the present invention more clear, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in a variety of different configurations.

[0020] The specific embodiment of the bottom lifting and pressure maintaining valve for the hydraulic support involved in the utility model is as follows: Figure 1-Figure 5 The valve body 1 includes a valve body 1, an elongated valve cavity 2 is provided in the valve body 1, and a one-way lock valve core 3 is provided at the first end of the valve cavity 2. The definition of the first end is optional and will be determined later. The one-way lock valve core 3 and the valve body 1 form a one-way valve. A connecting channel 4 extending to both ends of the one-way lock valve core is provided on the one-way lock valve core 3, and a sealing member 5 is provided between the first end of the one-way lock valve core 3 and the valve body 1. The existence of the connecting channel 4 is to prevent the one-way lock valve core 3 from forming a vacuum with the end of the valve cavity 2, so that the one-way lock valve core 3 cannot move. A liquid inlet 6 and a liquid outlet 7 are provided on the valve body 1. The liquid inlet 6 and the liquid outlet 7 are located on both sides of the opening and closing position where the one-way lock valve core and the valve body cooperate, wherein the liquid inlet is on the second side and the liquid outlet is on the first side. The one-way lock valve core 3 is a stepped shaft with a larger diameter at the second end and a smaller diameter at the first end. A compression spring 8 is sleeved on the small diameter section of the one-way lock valve core 3. The second end of the compression spring 8 presses against the stepped surface of the one-way lock valve core, and the first end of the compression spring 8 presses against the valve body 1. Due to the presence of the seal 5, the spring chamber between the one-way lock valve core and the valve body that accommodates the compression spring is a closed space. The spring chamber and the liquid outlet are connected through a pressure balance hole provided in the one-way lock valve core. The first end of the one-way lock valve core 3 has a conical sealing surface 9, and the valve body 1 has a mating surface 10 that mates with the sealing surface. The sealing surface 9 and the mating surface 10 cooperate and separate to form the opening and closing of the one-way valve.

[0021] This is a one-way valve with a specific structure. It applies only to this one-way valve structure. When liquid enters the liquid inlet 6, the hydraulic pressure acts on the one-way lock valve core, which is pushed toward the first end by the hydraulic pressure. The one-way valve opens, and the liquid quickly flows out of the liquid outlet. Due to resistance, the pressure in the spring chamber does not increase, and the one-way valve remains open. When liquid no longer enters the liquid inlet, the one-way valve closes due to the loss of hydraulic pressure. Therefore, the one-way valve is normally closed. If the liquid outlet is in a pressure-maintaining state, that is, if liquid no longer flows out of the liquid outlet, high-pressure liquid will enter the spring chamber through the pressure balance hole. Eventually, the hydraulic pressure is balanced, and under the action of the compression spring, the one-way valve will also close. Conversely, if liquid enters the liquid outlet, the one-way valve will not open.

[0022] A control mechanism valve core 11 is sealingly and slidingly provided at the second end of the valve chamber 2. A pressure-regulating spring 12 is pressed between the second end of the control mechanism valve core 11 and the valve body 1. The control mechanism valve core 11 is pressed against the pressure-regulating spring 12 via a stabilizing block 13. The second end of the stabilizing block 13 has a stabilizing protrusion 14 that extends into the pressure-regulating spring. The first end of the stabilizing block 13 is recessed with a pit into which the second end of the control mechanism valve core 11 extends. The pressure-regulating spring 12 is pressed against the valve body 1 via a positioning mechanism. This positioning mechanism can move relative to the valve body 1 and can be positioned after movement to adjust the pressure of the pressure-regulating spring 12. The positioning mechanism is a threaded plug 15, which is screwed onto the valve body 1 and extends into the valve chamber 2 to press against the second end of the pressure-regulating spring 12. A stabilizing boss 16 is provided on the first end of the threaded plug 15, and the stabilizing boss 16 extends into the pressure regulating spring. An inner hexagonal structure 17 is provided on the end head of the second end of the pressure regulating spring. The inner hexagonal structure 17 is used to cooperate with a screwing tool to facilitate adjustment of the position of the threaded plug relative to the valve body, thereby adjusting the initial pressure of the pressure regulating spring. When the pressure at the liquid inlet is higher than the set pressure, the liquid pressure will push the control mechanism valve core 11 to move to the second end. At this time, the control mechanism valve core 11 leaves the one-way lock valve core, and the one-way valve will exist as an ordinary one-way valve. Moreover, when the one-way valve is closed, when the pressure at the liquid inlet reaches the first set pressure, that is, when the liquid pressure cannot resist the elastic force from the pressure regulating spring, the control mechanism valve core 11 will move to the one-way lock valve core, opening the one-way valve to facilitate oil return, that is, to facilitate the flow of oil from the liquid outlet to the liquid inlet.

[0023] A safety port 18 communicating with the valve cavity is also provided on the valve body 1. The safety port 18 is used to communicate with the relief valve when in use to prevent excessive pressure from damaging the hydraulic components.

[0024] The positioning mechanism in the above embodiment is a threaded plug. In other embodiments, other adjustable positioning mechanisms in the prior art may be selected, such as a slider, and a set screw may be used to position the slider.

[0025] In the above embodiment, the control mechanism valve core is press-fitted with the pressure regulating spring via the stabilizing block. In other embodiments, the control mechanism valve core may be directly press-fitted with the pressure regulating spring.

[0026] In the above embodiment, the valve body is provided with a safety port communicating with the valve chamber for communicating with the overflow valve. In other embodiments, this port may not be provided, by providing a safety valve in the entire hydraulic system.

[0027] The above embodiment provides a one-way valve with a specific structure. In other implementations, a one-way valve composed of a valve body and a valve core in any other structure may be used.

[0028] When in use, the valve is initially in the Figure 1 The one-way lock valve core is in a normally open state under the action of the control mechanism valve core, so that the bottom lifting cylinder is in a state of complete contraction, that is, the bottom lifting cylinder is in a state of complete oil return.

[0029] When the bottom lifting cylinder is extended, the valve is fed with liquid in the positive direction, and the control mechanism valve core is compressed by the liquid pressure and the pressure regulating spring moves. The control mechanism valve core is away from the one-way lock valve core and no longer pushes the one-way lock valve core. However, the liquid inlet is in the positive liquid feeding state, and the one-way valve is in the open state, that is, the one-way lock valve core is still in the open state. Figure 2 As shown. This makes the valve only have the one-way lock function, that is, the function of a one-way valve, to achieve the extension of the bottom lifting cylinder and the lifting of the bracket base. When the liquid inlet is not flowing in and the pressure is greater than the pressure adjusted by the pressure regulating spring, because the liquid inlet is no longer flowing in, the one-way lock valve core is closed, but the liquid inlet pressure is greater than the adjusted pressure, the control mechanism valve core remains in the second end position, the one-way lock valve core will not be subjected to the top pressure of the control mechanism valve core, and this valve is in a pressure-maintaining state, so that the bracket maintains its posture, as shown. Figure 3 During the lifting process, when the liquid inlet pressure is not lower than the pressure set by the control mechanism, the one-way lock valve string continues to play a role, filling the lower chamber of the bottom lifting cylinder with liquid and locking the chamber to keep the bottom lifting action of the bracket.

[0030] After the support is pulled, when the pressure of the positive inlet of the valve drops below the set pressure, the valve core of the control mechanism moves to the initial position under the force of the spring, contacts and pushes the valve core of the one-way lock valve core to open the one-way lock valve core. Under the action of the deadweight of the support, the bottom lifting cylinder is retracted, and the support base stops lifting the bottom. Figure 4 .

[0031] The various functions of this valve in application:

[0032] Pressure maintenance: During the bottom lifting process, the pressure maintenance function of the bottom lifting cylinder is realized to ensure the stability of the bottom lifting of the bracket;

[0033] Automatic liquid return: When the pushing, sliding and pulling of the frame is completed, the liquid inlet pressure is lower than the set pressure of the control mechanism, the valve core of the control mechanism opens the one-way lock valve core to automatically return liquid, and the one-way lock valve string is in a normally open state, and the bottom lifting cylinder is retracted to return the bracket base to the normal state.

[0034] In use, this valve is connected to the support cylinder's oil circuit in the same manner as a conventional check valve string. The support cylinder is a standard single-acting cylinder connected to the pump and oil tank via a reversing valve. This valve string is located between the reversing valve and the oil port of the support cylinder's rodless chamber. When the check valve is in effect—that is, when the control mechanism valve core does not interfere with the one-way lock valve core—the valve allows oil to flow into the support cylinder's rodless chamber.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate and not to limit the technical solutions of the present invention. Any equivalent replacement of the present invention and any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A bottom lifting and pressure maintaining valve for a hydraulic support, characterized in that: The closure of the valve body is formed by a spring, and a check valve core is provided on the closure member so that the check valve core can be opened and closed by the check valve.

2. The bottom lifting and pressure maintaining valve for a hydraulic support according to claim 1, characterized in that: The positioning mechanism is a threaded plug screwed into the valve cavity of the valve body, and a hexagonal structure for cooperating with a screwing tool is provided on the end of the second end of the threaded plug.

3. The bottom lifting and pressure maintaining valve for a hydraulic support according to claim 2, characterized in that: The first end of the threaded plug is provided with a stabilizing boss which extends into the pressure regulating spring.

4. The bottom-lifting pressure-maintaining valve for a hydraulic support according to claim 3, characterized in that: The control mechanism valve core is pressed together with the pressure regulating spring through a stabilizing block. The second end of the stabilizing block has a stabilizing protrusion that extends into the pressure regulating spring. The first end of the stabilizing block is concavely provided with a pit for the second end of the control mechanism valve core to extend into.

5. The bottom lifting and pressure maintaining valve for a hydraulic support according to claim 1, 2, 3 or 4, characterized in that: The valve body is provided with a safety port which is communicated with the valve cavity and used for communicating with the overflow valve.

6. The bottom-lifting pressure-maintaining valve for a hydraulic support according to claim 5, characterized in that: The one-way lock valve core is provided with a communication channel extending to both ends of the one-way lock valve core, and a sealing member is provided between the first end of the one-way lock valve core and the valve body.

7. The bottom-lifting pressure-maintaining valve for a hydraulic support according to claim 6, characterized in that: The one-way lock valve core is a stepped shaft with a large diameter at the second end and a small diameter at the first end. The compression spring presses on the step surface of the one-way lock valve core. The spring cavity between the one-way lock valve core and the valve body that accommodates the compression spring is connected to the liquid outlet through a pressure balance hole opened on the one-way lock valve core.

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