Three-position four-way directional valve and hydraulic support control system

Abstract

The present application proposes a three-position, four-way directional valve and a hydraulic support control system. The three-position, four-way directional valve comprises: a valve body having a valve cavity; the valve body is provided with a T1 port, an A port, a P port, a B port, and a T2 port connected to the valve cavity; a first valve core is arranged in the valve cavity and in sliding and sealing contact with the valve body, and is used to adjust the opening between the A port and the P port, and between the A port and the T1 port; a second valve core is arranged in the valve cavity and in sliding and sealing contact with the valve body, and is used to adjust the opening between the B port and the P port, and between the B port and the T2 port; a reset member connects the first valve core and the second valve core. Compared to the related art that uses two two-position, two-way directional valves for control, the three-position, four-way directional valve of the present application can replace the two two-position, two-way directional valves, with a high degree of integration, thereby reducing the complexity and occupied space of the hydraulic support control system and reducing costs.

Description

Technical Field

[0001] The present application relates to the field of hydraulic control technology, and in particular to a three-position four-way reversing valve and a hydraulic support control system. Background Art

[0002] As part of the hydraulic support control system, reversing valves play a vital role in achieving precise motion control. They drive mechanical equipment by controlling the flow direction and pressure of the emulsion, ensuring its efficient and stable operation.

[0003] In the related art, a hydraulic support control system generally uses two two-position two-way reversing valves to coordinate the extension and retraction actions of the support jack.

[0004] As market competition intensifies, the industry is increasingly demanding more efficient and cost-effective hydraulic support control systems. However, in practice, the hydraulic support control system uses two two-position two-way directional valves, which are complex in structure and relatively expensive to manufacture, failing to meet market demand. Summary of the Invention

[0005] This application aims to solve at least one of the technical problems existing in the related art.

[0006] To this end, a first aspect of the present application is to provide a three-position four-way directional valve.

[0007] The second aspect of the present application is to provide a hydraulic support control system.

[0008] In view of this, according to the first aspect of the present application, a three-position four-way reversing valve is proposed, including: a valve body, the valve body having a valve cavity; the valve body is provided with a T1 port, an A port, a P port, a B port and a T2 port connected to the valve cavity; a first valve core is arranged in the valve cavity and in sliding and sealing contact with the valve body, and is used to adjust the opening between the A port and the P port and between the A port and the T1 port; a second valve core is arranged in the valve cavity and in sliding and sealing contact with the valve body, and is used to adjust the opening between the B port and the P port and between the B port and the T2 port; a reset member connects the first valve core and the second valve core.

[0009] Among them, the three-position four-way reversing valve has a neutral state, a first state and a second state; in the neutral state, port A is connected to port T1, port B is connected to port T2, the opening between port A and port P is zero, and the opening between port B and port P is zero; in the first state, port A is connected to port P, port B is connected to port T2, the opening between port A and port T1 is zero, and the opening between port B and port P is zero; in the second state, port A is connected to port T1, port B and port P are connected, the opening between port A and port P is zero, and the opening between port B and port T2 is zero.

[0010] Thus, when the above-mentioned three-position, four-way directional valve is applied to a hydraulic support control system, port A of the three-position, four-way directional valve cooperates with the hydraulic cylinder in the hydraulic support control system to perform action A (e.g., extension of the hydraulic cylinder); port B cooperates with the hydraulic cylinder in the hydraulic support control system to perform action B (e.g., retraction of the hydraulic cylinder). In the neutral position, pressure is released from ports A and B through ports T1 and T2, respectively, while the openings between ports A and P, and between ports B and P, are zero, ensuring that the hydraulic cylinder is in a non-operating or ready state. In the first position, ports A and P are connected, allowing pressurized oil to enter port A through port P, while port B releases pressure through port T2, enabling the hydraulic cylinder to perform action A. Similarly, in the second position, ports B and P are connected, allowing pressurized oil to enter port B through port P, while port A releases pressure through port T1, enabling the hydraulic cylinder to perform action B. Through this Y-shaped three-position four-way directional valve with a neutral position function, the movement of the hydraulic cylinder can be accurately controlled, and the automation and efficient operation of the hydraulic support control system can be realized. Compared with the related technology that uses two two-position two-way directional valves for control, it has a high degree of integration, thereby reducing the complexity and occupied space of the hydraulic support control system and achieving cost reduction.

[0011] In some technical solutions, optionally, a first pilot channel and a second pilot channel are respectively provided at the left and right ends of the valve body.

[0012] In practical applications, the first and second pilot channels are connected to an external control system (such as a pressure source) to adjust the flow or pressure in the pilot channels, thereby driving the first and second valve cores to move in a specific direction, ultimately changing their positions. In this way, by adjusting parameters such as pressure or flow in the pilot channels, the valve core positions can be flexibly adjusted to suit different application requirements.

[0013] In some technical solutions, optionally, a first valve sleeve is provided on the first valve core, and the first valve sleeve and the first valve core are in sliding and sealing contact to adjust the opening between port A and port T1; and / or; a second valve sleeve is provided on the second valve core, and the second valve sleeve and the second valve core are in sliding and sealing contact to adjust the opening between port B and port T2.

[0014] In this way, when the pressure oil begins to enter the valve cavity from the pilot channel, the pressure at this time is not enough to overcome the elastic force of the reset member. Therefore, the valve core does not move immediately. Instead, the valve sleeve is pushed first, so that the opening between port T1 and port A or port T2 and port B is zero. As the pressure in the pilot channel increases, the pressure can eventually overcome the elastic force of the reset member. At this time, the valve core is also pushed, so that port A and port P are connected or port B and port P are connected, completing the channel switching. With this design, the channel switching is more precise and controllable.

[0015] In some technical solutions, the three-position, four-way directional valve optionally further includes at least two first sealing rings; one of the two first sealing rings is located between the connection between port A and the valve cavity and the connection between port T1 and the valve cavity, and the other is located between the connection between port B and the valve cavity and the connection between port T2 and the valve cavity. This effectively improves the isolation between ports T1 and A, and between ports B and T2, thereby preventing leakage in the non-working channel and facilitating precise control.

[0016] In some technical solutions, the three-position, four-way directional valve optionally further includes at least two second sealing rings; one of the two second sealing rings is located between the connection between port A and the valve cavity and the connection between port P and the valve cavity, and the other is located between the connection between port B and the valve cavity and the connection between port P and the valve cavity. This can further prevent leakage in the non-working channel.

[0017] In some technical solutions, optionally, a limit step is provided in the valve body; the limit step is located between the first valve core and the second valve core; wherein, the first valve core and the second valve core are both provided with a boss that cooperates with the limit step to stop the first valve core and the second valve core.

[0018] In actual applications, when the boss on the valve core moves to the position of the limit step, the boss will contact the limit step, thereby preventing the valve core from moving further. This helps prevent the valve core from being damaged due to excessive movement or causing inaccurate control. At the same time, the design of the limit step also helps to enhance the stability of the valve core during movement. When the valve core is subjected to fluid pressure or other external forces, the limit step can provide additional support and constraint to prevent the valve core from unnecessary displacement or vibration.

[0019] In some technical solutions, optionally, the valve body includes an upper shell, an intermediate shell and a lower shell; wherein, the upper shell and the lower shell are arranged at both ends of the intermediate shell and define a valve cavity with the intermediate shell; the upper shell and the intermediate shell are detachably connected; the lower shell and the intermediate shell are detachably connected.

[0020] In this way, by designing the valve body as a split structure including an upper shell, an intermediate shell and a lower shell, installation and maintenance are facilitated, which helps to reduce costs.

[0021] In some technical solutions, a threaded cylinder is optionally included; the threaded cylinder is connected to the upper housing, or the threaded cylinder is connected to the lower housing. The threaded cylinder design allows the three-position four-way reversing valve and other components to be threadedly connected, thereby helping to simplify the valve installation process.

[0022] In some technical solutions, optionally, the space between the first valve core and the second valve core defines a pressure relief chamber; wherein, the first valve core is provided with a pressure relief channel connected to the pressure relief chamber, and / or the second valve core is provided with a pressure relief channel connected to the pressure relief chamber.

[0023] In the above technical solution, the existence of the pressure relief chamber provides a space for pressure release for the movement of the first valve core and the second valve core, and allows part of the pressure to be released through the pressure relief channel, thereby reducing the resistance encountered by the valve core during movement, thereby ensuring that the first valve core and the second valve core can move smoothly; at the same time, it can also avoid damage to the valve caused by abnormal increase in internal pressure of the valve, thereby helping to improve the safety and reliability of the valve.

[0024] According to a second aspect of this application, a hydraulic support control system is provided, comprising a hydraulic cylinder, two pilot valves, a controller, and a three-position, four-way reversing valve as provided in any of the aforementioned technical solutions. The pilot valve is connected to the three-position, four-way reversing valve, serving as a control element for controlling the movement of a first valve core and a second valve core; the controller is electrically connected to the pilot valve; the rodless chamber of the hydraulic cylinder communicates with one of ports A and B, while the rod chamber of the hydraulic cylinder communicates with the other of ports A and B. Thus, this hydraulic support control system exhibits all the beneficial effects of any of the aforementioned embodiments, and further description thereof is omitted.

[0025] Additional aspects and advantages of the present application will become apparent in the following description or may be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 A schematic diagram showing the control principle of a hydraulic support control system in the related art is shown;

[0028] Figure 2 One of the structural schematic diagrams of the three-position four-way reversing valve in the embodiment of the present application is shown;

[0029] Figure 3 A schematic structural diagram of a three-position four-way directional valve in a neutral position in an embodiment of the present application is shown;

[0030] Figure 4 A schematic structural diagram of a three-position four-way directional valve in an embodiment of the present application in a first state is shown;

[0031] Figure 5 A schematic diagram showing the control principle of a three-position four-way directional valve in an embodiment of the present application is shown;

[0032] Figure 6A schematic diagram of the control principle of the hydraulic support control system in an embodiment of the present application is shown.

[0033] in, Figure 1 The corresponding relationship between the reference numerals and component names is as follows:

[0034] 210'-pilot valve; 220'-controller; 230'-two-position two-way reversing valve;

[0035] Figures 2 to 6 The corresponding relationship between the reference numerals and component names is as follows:

[0036] 10-Three-position, four-way reversing valve; 100-Valve body; 101-Valve chamber; 102-T1 port; 103-A port; 104-P port; 105-B port; 106-T2 port; 107-Upper housing; 108-Intermediate housing; 109-Lower housing; 110-First valve core; 111-First oil groove; 112-First valve sleeve; 113-Shoulder; 120-Second valve core; 121-Second oil groove; 122-Second valve sleeve; 123-Pressure relief chamber; 124-Pressure relief passage; 130-Reset element; 140-First pilot passage; 150-Second pilot passage; 160-First sealing ring; 170-Second sealing ring; 180-Limiting step; 190-Threaded cylinder;

[0037] 20-Hydraulic support control system; 200-Hydraulic cylinder; 201-Rodless chamber; 202-Rod chamber; 210-Pilot valve; 220-Controller. DETAILED DESCRIPTION

[0038] In order to more clearly understand the above-mentioned objects, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other in the absence of conflict.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0040] Reference Figure 1 In related art, a hydraulic support control system includes two pilot valves 210', a controller 220', and two 2 / 2-way directional control valves 230'. These two 2 / 2-way directional control valves 230' control the hydraulic cylinders of the hydraulic support to perform actions A and B, respectively. While this configuration is mature, it has limitations in terms of compactness and cost-effectiveness. However, with technological advancements and intensified market competition, the industry is increasingly demanding more efficient and cost-effective solutions for hydraulic support control systems.

[0041] In view of this, the present application aims to provide a three-position four-way directional valve to replace two two-position two-way directional valves, so that the total amount of accessories for one valve core is less than the total amount of the original two valve cores, thereby achieving cost reduction.

[0042] The following combination Figures 2 to 6 , the three-position four-way reversing valve and hydraulic support control system provided in the embodiment of the present application are described in detail through specific embodiments and their application scenarios.

[0043] Reference Figure 2 In an embodiment of the present application, a three-position four-way reversing valve 10 is provided, the structure of which includes a valve body 100, a first valve core 110, a second valve core 120 and a reset member 130.

[0044] Specifically, a valve cavity 101 is provided within the valve body 100. The valve body 100 is provided with a T1 port 102 (oil return port), an A port 103 (working port), a P port 104 (oil inlet port), a B port 105 (working port), and a T2 port 106 (oil return port), all of which are connected to the valve cavity 101. Specifically, the A port 103 is located between the connection between the T1 port 102 and the valve cavity 101 and the connection between the P port 104 and the valve cavity 101, and the B port 105 is located between the connection between the T2 port 106 and the valve cavity 101 and the connection between the P port 104 and the valve cavity 101.

[0045] A first valve core 110 and a second valve core 120 are spaced apart along the left-right direction within the valve cavity 101. Both the first valve core 110 and the second valve core 120 are in sliding, sealing contact with the valve body 100. The first valve core 110 is used to adjust the opening between port A 103 and port P 104, as well as the opening between port A and port T1. The second valve core 120 is used to adjust the opening between port B 105 and port P 104, as well as the opening between port B 105 and port T2 106.

[0046] The reset member 130 is arranged between the first valve core 110 and the second valve core 120, and is connected to the first valve core 110 and the second valve core 120 at the same time, and is used to provide elastic force between the first valve core 110 and the second valve core 120 to ensure that they can return to a preset position or maintain a certain distance. When the first valve core 110 and the second valve core 120 are moved by an external force (such as fluid pressure or operating force), the reset member 130 can help the first valve core 110 and the second valve core 120 return to their initial positions after the external force disappears. For example, in this embodiment, the reset member 130 is a spring. It can be understood that other reset structures such as reset rod reset, etc. can also be used, and this embodiment is not limited to this.

[0047] Reference Figure 2 、 Figure 3 、 Figure 4 and Figure 5 In the above embodiment, the first valve core 110 and the second valve core 120 can be respectively located at the initial position and the working position under the drive of external force, so that the three-position four-way reversing valve 10 has a neutral state, a first state and a second state. Figure 5 The T-ports include a T1 port 102 and a T2 port 106 .

[0048] Among them, in the neutral state, the first valve core 110 and the second valve core 120 are in the initial position. At this time, the A port 103 is connected to the T1 port 102, the B port 105 is connected to the T2 port 106, the opening of the A port 103 and the P port 104 is zero, and the opening between the B port 105 and the P port 104 is zero; in the first state, the first valve core 110 is driven by an external force to move to the working position, and the second valve core 120 is in the initial position. At this time, the A port 103 is connected to the P port 104, and the B port 105 is connected to the P port 104. 05 and T2 port 106 are connected, the opening between port A 103 and port T1 102 is zero, and the opening between port B 105 and port P 104 is zero; in the second state, the first valve core 110 is located at the initial position, and the second valve core 120 moves to the working position under the drive of external force. At this time, port A 103 and port T1 102 are connected, port B 105 and port P 104 are connected, the opening between port A 103 and port P 104 is zero, and the opening between port B 105 and port T2 106 is zero.

[0049] Reference Figure 2 and Figure 6 In this way, when the above-mentioned three-position four-way reversing valve 10 is applied to the hydraulic support control system, the A port 103 of the three-position four-way reversing valve 10 cooperates with the hydraulic cylinder in the hydraulic support control system to perform action A (such as hydraulic cylinder extension); the B port 105 cooperates with the hydraulic cylinder in the hydraulic support control system to perform action B (such as hydraulic cylinder shortening).

[0050] In the neutral state, pressure is released from port A 103 and port B 105 through port T1 102 and port T2 106, respectively, and the openings between port A 103 and port P 104, and between port B 105 and port P 104, are zero, ensuring that the hydraulic cylinder is in a non-operating or ready state. In the first state, port A 103 and port P 104 are connected, allowing pressurized oil to enter port A 103 through port P 104, while port B 105 is pressure-released through port T2 106, enabling the hydraulic cylinder to perform action A. Similarly, in the second state, port B 105 and port P 104 are connected, allowing pressurized oil to enter port B 105 through port P 104, while port A 103 is pressure-released through port T1 102, enabling the hydraulic cylinder to perform action B. Through this Y-shaped three-position four-way directional valve 10 with a neutral position function, the movement of the hydraulic cylinder can be accurately controlled to achieve the automation and efficient operation of the hydraulic support control system. Compared with the related technology that uses two two-position two-way directional valves for control, it has a high degree of integration, thereby reducing the complexity and occupied space of the hydraulic support control system and achieving cost reduction.

[0051] In the above embodiment, a first oil groove 111 is provided on the circumferential side surface of the first valve core 110. Communication between the A port 103 and the T1 port 102, as well as communication between the A port 103 and the P port 104, is achieved through the first oil groove 111. Similarly, a second oil groove 121 is provided on the circumferential side surface of the second valve core 120.

[0052] In some embodiments, the left end of the valve body 100 is provided with a first pilot channel 140 (P×1 port), and the right end is provided with a second pilot channel 150 (P×2 port). In actual applications, the first and second pilot channels 140, 150 are connected to an external control system (e.g., a pressure source) to adjust the flow or pressure in the pilot channels, thereby driving the first and second valve cores 110, 120 to move in a specific direction, ultimately changing the positions of the first and second valve cores 110, 120.

[0053] Specifically, pressurized oil can enter the valve chamber 101 from the first pilot channel 140 to drive the first valve core 110 to move rightward, or enter the valve chamber 101 from the second pilot channel 150 to drive the second valve core 120 to move leftward, thereby changing the state of the three-position four-way reversing valve 10. In this way, by adjusting parameters such as pressure or flow in the pilot channel, the position of the valve core can be flexibly adjusted to meet different application requirements.

[0054] In the above embodiment, a first valve sleeve 112 is sleeved over the first valve core 110, and the first valve sleeve 112 and the first valve core 110 are in sliding, sealed contact. As a result, when pressurized oil begins to enter the valve chamber 101 from the first pilot passage 140, the pressure at that time is insufficient to overcome the elastic force of the return element 130. Therefore, the first valve core 110 does not move immediately. Instead, the first valve sleeve 112 is first pushed rightward, causing the opening between the T1 port 102 and the A port 103 to be zero. As the pressure in the first pilot passage 140 increases, the pressure eventually overcomes the elastic force of the return element 130, and the first valve core 110 is also pushed rightward, thereby connecting the A port 103 and the P port 104, completing channel switching. This makes channel switching more precise and controllable.

[0055] In the above embodiment, grooves are provided on the inner and outer circumferential surfaces of the first valve sleeve 112 , and sealing rings and retaining rings are provided in the grooves, so that the first valve sleeve 112 and the valve body 100 and the first valve core 110 are in sliding and sealing contact.

[0056] In actual application, the second valve core 120 is also sleeved with a second valve sleeve 122, and the second valve sleeve 122 is in sliding and sealing contact with the second valve core 120. It is understandable that the matching relationship between the second valve sleeve 122, the second valve core 120, and the valve body 100 can refer to the installation method of the first valve sleeve 112 described above. This will not be difficult for those skilled in the art and will not be described in detail here.

[0057] In some embodiments, the three-position, four-way reversing valve 10 further includes at least two first sealing rings 160. One of the two first sealing rings 160 is located between the connection between port A 103 and the valve cavity 101 and the connection between port T1 102 and the valve cavity 101, and the other is located between the connection between port B 105 and the valve cavity 101 and the connection between port T2 106 and the valve cavity 101. That is, port T1 102 and port A 103 are spaced apart on either side of one of the first sealing rings 160, and port B 105 and port T2 106 are spaced apart on either side of the other first sealing ring 160. This effectively improves the isolation between port T1 102 and port A 103, and between port B 105 and port T2 106, thereby preventing leakage in the non-working channel and facilitating precise control.

[0058] Specifically, when the first valve sleeve 112 moves to the right until the first valve sleeve 112 and the first sealing ring 160 contact and form a seal, the A port 103 and the T1 port 102 are cut off; similarly, when the second valve sleeve 122 moves to the left until the second valve sleeve 122 and the first sealing ring 160 contact and form a seal, the B port 105 and the T2 port 106 are cut off.

[0059] In some embodiments, the three-position four-way reversing valve 10 further includes at least two second sealing rings 170, one of the two second sealing rings 170 being located between the connection between the A port 103 and the valve cavity 101 and the connection between the P port 104 and the valve cavity 101, and the other being located between the connection between the B port 105 and the valve cavity 101 and the connection between the P port 104 and the valve cavity 101, that is, the A port 103 and the P port 104 are spaced apart on both sides of one of the second sealing rings 170, and the P port 104 and the B port 105 are spaced apart on both sides of the other second sealing ring 170; in this way, leakage of the non-working channel can be further prevented.

[0060] In some embodiments, a limiting step 180 is further provided in the valve body 100. The limiting step 180 is located between the first valve core 110 and the second valve core 120. Both the first valve core 110 and the second valve core 120 are provided with a shoulder 113 that cooperates with the limiting step 180. Thus, the limiting step 180 and the shoulder 113 cooperate to stop the first valve core 110 and the second valve core 120.

[0061] Specifically, when the boss 113 on the valve core moves to the position of the limit step 180, the boss 113 will contact the limit step 180, thereby preventing the valve core from moving further. This helps prevent the valve core from being damaged or causing inaccurate control due to excessive movement. At the same time, the design of the limit step 180 also helps to enhance the stability of the valve core during movement. When the valve core is subjected to fluid pressure or other external forces, the limit step 180 can provide additional support and constraint to prevent the valve core from unnecessary displacement or vibration.

[0062] Specifically, the first valve core 110 and the second valve core 120 are both provided with a guide portion extending to the interior of the limiting step 180 , and the guide portion is in sliding and sealing contact with the limiting step 180 .

[0063] In practical applications, the guide portions of the first valve core 110 and the second valve core 120 are provided with coaxial grooves, wherein the reset member 130 is inserted into the grooves.

[0064] Reference Figure 2 In some embodiments, the valve body 100 includes an upper housing 107, an intermediate housing 108, and a lower housing 109. The upper housing 107 and the lower housing 109 are located at opposite ends of the intermediate housing 108 and define a valve chamber 101 together with the intermediate housing 108. The upper housing 107 and the intermediate housing 108 are detachably connected, and the lower housing 109 and the intermediate housing 108 are detachably connected. Designing the valve body 100 as a split structure consisting of the upper housing 107, the intermediate housing 108, and the lower housing 109 facilitates installation and maintenance, helping to reduce costs.

[0065] Exemplarily, the upper shell 107 and the lower shell 109 are connected and fixed to the middle shell 108 by screws.

[0066] In some embodiments, the three-position four-way reversing valve 10 further includes a threaded cylinder 190, which is connected to the upper housing 107. The threaded cylinder 190 allows the three-position four-way reversing valve 10 to be threadedly connected to other components, thereby simplifying the valve installation process.

[0067] In some embodiments, the space between the first valve core 110 and the second valve core 120 defines a pressure relief chamber 123 , wherein the second valve core 120 is provided with a pressure relief channel 124 communicating with the pressure relief chamber 123 .

[0068] In the above embodiment, the existence of the pressure relief chamber 123 provides a space for pressure release for the movement of the first valve core 110 and the second valve core 120, and allows part of the pressure to be released through the pressure relief channel 124, thereby reducing the resistance encountered by the valve core during movement, thereby ensuring that the first valve core 110 and the second valve core 120 can move smoothly; at the same time, it can also avoid damage to the valve caused by abnormal increase in internal pressure of the valve, thereby helping to improve the safety and reliability of the valve.

[0069] It is understandable that a pressure relief channel 124 may be provided on the first valve core 110 according to actual needs.

[0070] In some embodiments, the present application further provides a hydraulic support control system 20, comprising a hydraulic cylinder 200, two pilot valves 210, a controller 220, and the three-position, four-way reversing valve 10 provided in any of the aforementioned embodiments. The pilot valve 210 is connected to the three-position, four-way reversing valve 10, serving as a control element for controlling the movement of the first valve core 110 and the second valve core 120; the controller 220 is electrically connected to the pilot valve 210; the rodless chamber 201 of the hydraulic cylinder 200 communicates with one of the ports A 103 and B 105, and the rod chamber 202 of the hydraulic cylinder 200 communicates with the other of the ports A 103 and B 105. Thus, this hydraulic support control system 20 has all the beneficial effects of any of the aforementioned embodiments, and no further details will be given here.

[0071] It should be clarified that in the claims, specification and drawings of this application, the term "plurality" refers to two or more. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the purpose of more conveniently describing this application and making the description process simpler, and is not intended to indicate or imply that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation. Therefore, these descriptions cannot be understood as limitations on this application. The terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

[0072] In the claims, specification, and drawings of this application, the terms "one embodiment," "some embodiments," "a specific embodiment," and the like mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of this application. In the claims, specification, and drawings of this application, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0073] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A three-position four-way reversing valve, characterized in that: include: The valve body has a valve cavity; the valve body is provided with a T1 port, an A port, a P port, a B port and a T2 port communicating with the valve cavity; a first valve core, disposed in the valve cavity and in sliding sealing contact with the valve body, for adjusting the opening between the A port and the P port and between the A port and the T1 port; a second valve core, disposed in the valve cavity and in sliding sealing contact with the valve body, for adjusting the opening between the B port and the P port and between the B port and the T2 port; a reset member, disposed between the first valve core and the second valve core, and connecting the first valve core and the second valve core; Wherein, the three-position four-way reversing valve has a neutral state, a first state and a second state; In the neutral state, the port A is connected to the port T1, the port B is connected to the port T2, the opening between the port A and the port P is zero, and the opening between the port B and the port P is zero; In the first state, the port A is connected to the port P, the port B is connected to the port T2, the opening between the port A and the port T1 is zero, and the opening between the port B and the port P is zero; In the second state, the port A is connected to the port T1, the port B is connected to the port P, the opening between the port A and the port P is zero, and the opening between the port B and the port T2 is zero; The left and right ends of the valve body are respectively provided with a first pilot channel and a second pilot channel; A limiting step is provided in the valve body; the limiting step is located between the first valve core and the second valve core; Wherein, the first valve core and the second valve core are both provided with a convex shoulder that cooperates with the limiting step to stop the first valve core and the second valve core; The space between the first valve core and the second valve core defines a pressure relief chamber; The first valve core is provided with a pressure relief channel communicating with the pressure relief chamber; and / or; The second valve core is provided with a pressure relief channel communicated with the pressure relief chamber.

2. The three-position four-way directional valve according to claim 1, characterized in that: A first valve sleeve is sleeved on the first valve core, and the first valve sleeve and the first valve core are in sliding and sealing contact; and / or A second valve sleeve is sleeved on the second valve core, and the second valve sleeve is in sliding and sealing contact with the second valve core.

3. The three-position four-way reversing valve according to claim 1, characterized in that: It also includes at least two first sealing rings; one of the two first sealing rings is located between the connection between the A port and the valve cavity and the connection between the T1 port and the valve cavity, and the other is located between the connection between the B port and the valve cavity and the connection between the T2 port and the valve cavity.

4. The three-position four-way reversing valve according to claim 1, characterized in that: It also includes at least two second sealing rings; one of the two second sealing rings is located between the connection between the A port and the valve cavity and the connection between the P port and the valve cavity, and the other is located between the connection between the B port and the valve cavity and the connection between the P port and the valve cavity.

5. The three-position four-way directional valve according to any one of claims 1 to 4, characterized in that: The valve body includes an upper shell, an intermediate shell and a lower shell; Wherein, the upper shell and the lower shell are arranged at both ends of the intermediate shell, and define the valve cavity together with the intermediate shell; The upper shell and the intermediate shell are detachably connected; The lower shell and the middle shell are detachably connected.

6. The three-position four-way reversing valve according to claim 5, characterized in that: It also includes a threaded cylinder; the threaded cylinder is connected to the upper shell, or the threaded cylinder is connected to the lower shell.

7. A hydraulic support control system, characterized in that: It comprises a hydraulic cylinder, two pilot valves, a controller and a three-position four-way reversing valve according to any one of claims 1 to 6; The pilot valve is connected to the three-position four-way reversing valve and serves as a control element for controlling the movement of the first valve core and the second valve core; The controller is electrically connected to the pilot valve; The rodless chamber of the hydraulic cylinder is communicated with one of the A port and the B port, and the rod chamber of the hydraulic cylinder is communicated with the other of the A port and the B port.

Images