Water-based proportional valve and hydraulic support system

Abstract

The invention relates to the technical field of coal mine hydraulic control, in particular to a water-based proportional valve and a hydraulic support system.The water-based proportional valve comprises a valve sleeve, a valve core, a valve core, a valve core, a valve core, a valve core and a valve core, the liquid inlet assembly comprises a liquid inlet valve element and a main spring, and the elastic force of the main spring acts on the liquid inlet valve element, so that the P port and the A port are disconnected; the liquid return assembly comprises a liquid return valve element, a pilot control cavity connected with the opening K is formed between the liquid return valve element and the plug, and when high-pressure liquid is injected into the pilot control cavity through the opening K, the liquid return valve element can be pushed to move towards the liquid inlet valve element; when the liquid return valve core is far away from the liquid inlet valve core, the T port is communicated with the A port through the liquid inlet valve core; when the liquid return valve element makes contact with the liquid inlet valve element, the T opening and the A opening are disconnected. And when the liquid return valve core pushes the liquid inlet valve core to move, the P port is communicated with the A port. The scheme is used for simplifying hydraulic valve element control, reducing system complexity and improving reliability and response speed.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine hydraulic control, and in particular to a water-based proportional valve and a hydraulic support system. Background Art

[0002] In coal mining, hydraulic supports are one of the key equipment in the coal mining face. They are not only used to support the roof to ensure a safe working environment, but also participate in important operations such as moving the frame and pushing the chute. In order to ensure that the coal mining machine can run on a stable track and achieve efficient and high-quality coal cutting, the straightness between the hydraulic supports and the linearity of the chute (i.e., scraper conveyor) are crucial.

[0003] Existing hydraulic support systems usually rely on a two-position three-way switch valve or a multi-stage speed regulating valve based on time control to control the position of the push jack. The hydraulic components in these systems have a simple structure but limited functions, and cannot provide stepless proportional control of the flow rate, resulting in insufficient control accuracy and difficulty in accurately adjusting the speed and position of the hydraulic cylinder. In particular, in the prior art, the return valve core and the inlet valve core need to be controlled separately by two independent two-position three-way control valves. This design increases the complexity of the system, making synchronous control difficult, while also increasing the possibility of failures, and is not conducive to the requirements of underground intrinsically safe equipment, because more electrical components mean a higher risk of explosion. Summary of the invention

[0004] The present invention provides a water-based proportional valve and hydraulic support system, which are used to solve the defects of system complexity and control difficulty caused by the need to separately control the return valve core and the inlet valve core in the prior art, and to simplify the control logic, reduce the control amount, improve the reliability and response speed of the system, and more easily meet the requirements of underground intrinsically safe equipment.

[0005] The present invention provides a water-based proportional valve, comprising: a valve sleeve having a main hole in an axial direction, and a P port, a T port and a K port connected to the main hole, one end of the main hole being blocked by a screw plug, and the other end being provided with an A port; a liquid inlet component, comprising a liquid inlet valve core and a main spring, the elastic force of the main spring acting on the liquid inlet valve core to disconnect the P port from the A port; a liquid return component, comprising a liquid return valve core, a pilot control cavity connected to the K port is formed between the liquid return valve core and the screw plug, and when high-pressure liquid is injected into the pilot control cavity through the K port, the liquid return valve core can be pushed to move toward the liquid inlet valve core; the T port is located between the liquid inlet valve core and the liquid return valve core, and when the liquid return valve core is away from the liquid inlet valve core, the T port is connected to the A port through the liquid inlet valve core; when the liquid return valve core contacts the liquid inlet valve core, the T port is disconnected from the A port; when the liquid return valve core pushes the liquid inlet valve core to move, the P port is connected to the A port.

[0006] According to one embodiment of the present invention, the liquid inlet assembly includes a guide sleeve, which is fixedly arranged at the end of the main hole opposite to the screw plug, the liquid inlet valve core is slidably matched with the guide sleeve, and the guide sleeve is provided with an inner circumferential flange at the end close to the A port for limiting the displacement of the liquid inlet valve core; the liquid inlet valve core is cylindrical, and the outer circumferential surface of the liquid inlet valve core is formed with a circumferential boss surrounding the liquid inlet valve core, the main spring is sleeved on the liquid inlet valve core and its two ends are respectively supported between the guide sleeve and the circumferential boss.

[0007] According to one embodiment of the present invention, the liquid inlet assembly includes an inlet valve seat, which is fixedly arranged in the main hole, and the inlet valve core slides through the inlet valve seat. When the return valve core moves away from the inlet valve core, the circumferential boss contacts the inlet valve seat under the elastic force of the main spring; the contact surface between the circumferential boss and the inlet valve seat is a wedge-shaped surface.

[0008] According to one embodiment of the present invention, the liquid inlet valve core has a central through hole connected to the A port, and the liquid inlet valve core is also provided with a radial hole connected to the central through hole on the part that slides with the liquid inlet valve seat; an annular liquid inlet cavity is formed between the guide sleeve, the valve sleeve, the liquid inlet valve core and the liquid inlet valve seat, and the position of the P port on the valve sleeve corresponds to the annular liquid inlet cavity; when the circumferential boss is separated from the liquid inlet valve seat, the A port is connected to the P port through the central through hole, the radial holes and the annular liquid inlet cavity in sequence.

[0009] According to one embodiment of the present invention, when the liquid return valve core is away from the liquid inlet valve core, a central cavity is provided between the liquid return valve core and the liquid inlet valve seat, the position of the T port on the valve sleeve corresponds to the central cavity, and the A port is connected to the T port through the central through hole and the central cavity in sequence; a liquid return valve seat is provided on the side of the liquid return valve core facing the liquid inlet valve core, which is used to seal the end of the central through hole when the liquid return valve core is in contact with the liquid inlet valve core; the liquid return valve core is also provided with a pressing nail, which is installed on the liquid return valve core to press the liquid return valve seat tightly into the installation slot hole of the liquid return valve core.

[0010] According to one embodiment of the present invention, a plurality of the P ports and the T ports are evenly arranged around the valve sleeve.

[0011] According to one embodiment of the present invention, the liquid return valve core includes a first sliding portion close to the liquid inlet component and a second sliding portion close to the screw plug; the first sliding portion is slidably matched with the inner wall of the main hole, the screw plug is provided with a pilot groove, the second sliding portion is inserted into the pilot groove and slidably matched with the pilot groove, one side of the pilot groove is provided with a through hole connected to the K port, and the pilot control chamber is located in the pilot groove; a balancing chamber is formed between the valve sleeve, the first sliding portion and the screw plug; the liquid return valve core is provided with an internal channel, and the balancing chamber is connected to the side of the liquid return valve core close to the liquid inlet component through the internal channel.

[0012] According to one embodiment of the present invention, the internal channel includes a small hole structure connected to the pilot control chamber; the liquid return assembly includes a floating valve core and a pilot spring, the floating valve core is installed in an installation groove of the liquid return valve core facing the pilot control chamber, and the pilot spring is used to provide a pre-tightening force to press the floating valve core inside the liquid return valve core to block the small hole structure.

[0013] According to one embodiment of the present invention, the liquid return assembly includes a plug, which is installed at one end of the liquid return valve core facing the pilot control chamber, the pilot spring is arranged between the plug and the floating valve core, and the plug is provided with a through hole connecting the inside and outside of the liquid return valve core; the floating valve core is conical and forms a conical surface when in contact with the small hole structure.

[0014] The present invention further provides a hydraulic support system, comprising a push jack, wherein the water-based proportional valve of the above embodiment is arranged on a hydraulic circuit for controlling the push jack.

[0015] The water-based proportional valve and hydraulic support system provided by the present invention, when high-pressure liquid is injected into the pilot control chamber through the K port, the return valve core will be pushed to move first; as the return valve core moves, it will gradually approach and finally contact the inlet valve core, and in this process, the T port is disconnected from the A port; once the return valve core completely contacts the inlet valve core and continues to apply thrust, the two move together, so that the P port is connected to the A port, thereby realizing liquid supply. Through the above-mentioned water-based proportional valve, the need for two independent control signals is eliminated, that is, it is no longer necessary to control the actions of the return valve core and the inlet valve core separately. On the contrary, only one control signal is required to operate the pressure in the pilot control chamber, and the action sequence of the two valve cores can be managed synchronously. Not only does it simplify the control logic and reduce the number of components required for the control system (such as electromagnets, etc.), but also because the number of relative movements between the moving parts is reduced, the reliability and response speed of the system are also improved. In addition, fewer electrical components reduce the risk of failure or explosion in the underground environment of coal mines, so it is easier to meet the requirements of intrinsically safe equipment, and provide a more concise, efficient and safe hydraulic control solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is one of the cross-sectional structural schematic diagrams of the water-based proportional valve provided by the present invention.

[0018] Figure 2 This is the second schematic cross-sectional structure diagram of the water-based proportional valve provided by the present invention.

[0019] Reference numerals: 10. Valve sleeve; 11. P port; 12. T port; 13. K port; 14. A port; 20. Liquid inlet valve core; 21. Main spring; 22. Guide sleeve; 23. Circumferential boss; 24. Liquid inlet valve seat; 25. Annular liquid inlet chamber; 26. Middle cavity; 30. Liquid return valve core; 31. Pilot control chamber; 32. Liquid return valve seat; 33. Press pin; 34. Balance chamber; 35. Internal channel; 36. Floating valve core; 37. Pilot spring; 38. Plug. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0022] Combine the following Figure 1 and Figure 2 A specific embodiment of the water-based proportional valve of the present invention is described.

[0023] The present invention provides a water-based proportional valve, comprising: a valve sleeve 10, having a main hole in an axial direction, and a P port 11, a T port 12 and a K port 13 connected to the main hole, one end of the main hole is blocked by a screw plug, and the other end is provided with an A port 14; a liquid inlet component, comprising a liquid inlet valve core 20 and a main spring 21, the elastic force of the main spring 21 acts on the liquid inlet valve core 20 to disconnect the P port 11 from the A port 14; a liquid return component, comprising a liquid return valve core 30, a pilot valve connecting the K port 13 is formed between the liquid return valve core 30 and the screw plug Control chamber 31, when high pressure liquid is injected into pilot control chamber 31 through K port 13, it can push liquid return valve core 30 to move toward liquid inlet valve core 20; T port 12 is located between liquid inlet valve core 20 and liquid return valve core 30, when liquid return valve core 30 is away from liquid inlet valve core 20, T port 12 is connected to A port 14 through liquid inlet valve core 20; when liquid return valve core 30 contacts liquid inlet valve core 20, T port 12 is disconnected from A port 14; when liquid return valve core 30 pushes liquid inlet valve core 20 to move, P port 11 is connected to A port 14. Among them, A port 14 is a working port, P port 11 is a liquid inlet port, T port 12 is a liquid return port, and K port 13 is a high pressure liquid control port.

[0024] Specifically, the water-based proportional valve realizes the interactive mechanism between the return valve core 30 and the inlet valve core 20. When the system needs to supply liquid, the high-pressure liquid will enter the pilot control chamber 31 through the K port 13 (high-pressure liquid control port), generating enough pressure to overcome the resistance of the return valve core 30 and move it toward the inlet valve core 20. As the return valve core 30 gradually approaches the inlet valve core 20, the two will eventually contact and move together. At this time, the P port 11 (inlet port) and the A port 14 (working port) that were originally kept closed by the main spring 21 begin to communicate, allowing the high-pressure liquid to flow from the P port 11 to the A port 14, realizing the liquid supply action for the push jack. This process not only simplifies the control logic of the hydraulic system, but also ensures the synchronization of the action of the two valve cores, improving the response speed and reliability of the system.

[0025] In use, the application of this technical solution makes the control of the hydraulic support system more intuitive and efficient. When the control system issues an instruction, only one signal is needed to start the entire process of liquid supply or liquid return. For example, when executing liquid supply, the electromagnet is energized to open the pilot valve, allowing the high-pressure liquid to flow into the pilot control chamber 31, and then push the liquid return valve core 30. Subsequently, as the liquid return valve core 30 contacts and pushes the liquid inlet valve core 20, the connection between the P port 11 (liquid inlet) and the A port 14 (working port) is completed. When liquid return is required, the electromagnet is de-energized, the pilot valve is reset, the pressure of the K port 13 (high-pressure liquid control port) is unloaded, and the liquid return valve core 30 is reset under the action of the spring, so that the T port 12 (liquid return port) is connected with the A port 14, thereby realizing the liquid return function. In the whole process, due to the reduction in the number of independent control components, the number of failure points is also reduced accordingly, which improves the stability and safety of the system.

[0026] Furthermore, the above technical solution supports easier realization of intrinsic safety in underground coal mine environments. Due to the integrated design, the number of electrical components required for the traditional two-position three-way control valve is reduced, and the potential spark risk is reduced, which is crucial for preventing gas explosions in mines. In addition, the water-based proportional valve provided by the present invention can also be combined with modern sensing technology and intelligent control systems to achieve more accurate proportional flow control to meet the needs under different working conditions.

[0027] According to a water-based proportional valve of the present invention, the liquid inlet assembly includes a guide sleeve 22, which is fixedly arranged at the end of the main hole opposite to the screw plug, and the liquid inlet valve core 20 is slidably matched with the guide sleeve 22. The guide sleeve 22 is provided with an inner peripheral flange at the end close to the A port 14 for limiting the displacement of the liquid inlet valve core 20; the liquid inlet valve core 20 is cylindrical, and the outer peripheral surface of the liquid inlet valve core 20 is formed with a circumferential boss 23 surrounding the liquid inlet valve core 20, and the main spring 21 is sleeved on the liquid inlet valve core 20 and supported between the guide sleeve 22 and the circumferential boss 23 at both ends. Specifically, the liquid inlet assembly ensures the efficient and stable operation of the hydraulic system through the combination of the guide sleeve 22 and the liquid inlet valve core 20. The guide sleeve 22 is fixedly arranged at the end of the main hole opposite to the screw plug, and forms a sliding match with the liquid inlet valve core 20 to ensure that the liquid inlet valve core 20 can move smoothly along the axial direction without deflection or jamming. An inner peripheral flange is provided at one end of the guide sleeve 22 close to the A port 14 (working port) to limit the maximum displacement of the liquid inlet valve core 20 to prevent excessive movement thereof resulting in structural damage or functional failure.

[0028] The outer circumferential surface of the liquid inlet valve core 20 forms a circumferential boss 23 around the liquid inlet valve core 20, which provides a reliable support point for the main spring 21. The main spring 21 is sleeved on the liquid inlet valve core 20, and its two ends are respectively supported between the end of the guide sleeve 22 and the circumferential boss 23 of the liquid inlet valve core 20. When the system is not supplied with liquid, the elastic force exerted by the main spring 21 acts on the liquid inlet valve core 20, so that the P port 11 (liquid inlet) and the A port 14 (working port) remain disconnected, thereby preventing the flow of liquid.

[0029] When high-pressure liquid is injected into the pilot control chamber 31 through the K port 13 (high-pressure liquid control port), and pushes the return valve core 30 toward the inlet valve core 20, the return valve core 30 will eventually contact and push the inlet valve core 20 to overcome the elastic force of the main spring 21. As the inlet valve core 20 moves, the P port 11 is connected to the A port 14, allowing the high-pressure liquid to flow from the P port 11 to the A port 14, completing the liquid supply action. In this process, the precise guidance of the guide sleeve 22 on the inlet valve core 20 and the constant restoring force provided by the main spring 21 together ensure the reliability and repeatability of the valve action.

[0030] It can be understood that the flow rate between the P port 11 and the A port 14 is related to the high-pressure liquid pressure entering the K port 13. When the high-pressure liquid pressure entering the K port 13 increases, the pressure in the pilot control chamber 31 increases, pushing the return valve core 30 toward the inlet valve core 20, thereby making the two contact and finally pushing the inlet valve core 20 to overcome the resistance of the main spring 21, and realize the connection between the P port 11 and the A port 14. As the pressure of the K port 13 further increases, the inlet valve core 20 will be pushed further, thereby increasing the opening size between the P port 11 and the A port 14, thereby increasing the flow rate.

[0031] According to a water-based proportional valve of the present invention, the liquid inlet assembly includes a liquid inlet valve seat 24, the liquid inlet valve seat 24 is fixedly arranged in the main hole, the liquid inlet valve core 20 slides through the liquid inlet valve seat 24, when the return valve core 30 is away from the liquid inlet valve core 20, the circumferential boss 23 contacts the liquid inlet valve seat 24 under the elastic force of the main spring 21; the contact surface between the circumferential boss 23 and the liquid inlet valve seat 24 is a wedge surface. The liquid inlet assembly significantly improves the performance and reliability of the water-based proportional valve by introducing the wedge surface contact mechanism.

[0032] Specifically, the above embodiment not only provides a more precise sealing effect, ensures that the P port 11 (liquid inlet) and the A port 14 (working port) are completely disconnected in the non-liquid supply state, prevents leakage and improves the response accuracy of the system; it can also guide the liquid inlet valve core 20 to smoothly leave the liquid inlet valve seat 24, reduce the friction resistance during the startup process, and make the valve action smoother. In addition, the wedge surface evenly distributes the pressure, reducing the local stress concentration on the contact surface. When the high-pressure liquid enters the pilot control chamber 31 through the K port 13 (high-pressure liquid control port) and pushes the return valve core 30 toward the liquid inlet valve core 20, the return valve core 30 will eventually contact and push the liquid inlet valve core 20 to overcome the elastic force of the main spring 21. As the liquid inlet valve core 20 moves, the wedge surface gradually breaks away from contact, and the opening between the P port 11 and the A port 14 gradually increases, allowing the high-pressure liquid to flow from the P port 11 to the A port 14, completing the liquid supply action. Throughout the process, the wedge-shaped surface design ensures the reliability and repeatability of valve action, while providing better flow control capabilities and optimizing the efficiency and stability of the entire hydraulic system.

[0033] According to a water-based proportional valve of the present invention, the liquid inlet valve core 20 has a central through hole connected to the A port 14, and the liquid inlet valve core 20 is also provided with a radial hole connected to the central through hole on the part that slides with the liquid inlet valve seat 24; the annular liquid inlet cavity 25 is formed between the guide sleeve 22, the valve sleeve 10, the liquid inlet valve core 20 and the liquid inlet valve seat 24, and the position of the P port 11 on the valve sleeve 10 corresponds to the annular liquid inlet cavity 25; when the circumferential boss 23 is separated from the liquid inlet valve seat 24, the A port 14 is connected to the P port 11 through the central through hole, the radial hole and the annular liquid inlet cavity 25 in sequence. Specifically, in the design of the water-based proportional valve, the liquid inlet valve core 20 has a central through hole connected to the A port 14 (working port), and a radial hole connected to the central through hole is provided on the part that slides with the liquid inlet valve seat 24. An annular liquid inlet cavity 25 is formed between the guide sleeve 22, the valve sleeve 10, the liquid inlet valve core 20 and the liquid inlet valve seat 24, and the position of the P port 11 (liquid inlet) on the valve sleeve 10 just corresponds to the annular liquid inlet cavity 25. When the circumferential boss 23 is separated from the liquid inlet valve seat 24, the A port 14 is connected to the P port 11 through the central through hole, the radial hole and the annular liquid inlet cavity 25 in sequence, realizing the flow path of the liquid from the P port 11 to the A port 14.

[0034] The design of the central through hole and the radial holes enables the high-pressure liquid to smoothly enter from the P port 11 and pass through the annular liquid inlet cavity 25 and the radial holes to reach the central through hole of the liquid inlet valve core 20, and finally flow to the A port 14. When the return valve core 30 pushes the liquid inlet valve core 20 to move, the circumferential boss 23 gradually separates from the liquid inlet valve seat 24, and the communication path between the A port 14 and the P port 11 is gradually established. Since the displacement of the liquid inlet valve core 20 is precisely controlled by the pressure of the K port 13 (high-pressure liquid control port), highly accurate regulation of the flow rate can be achieved. In the non-liquid supply state, the circumferential boss 23 is in close contact with the wedge surface of the liquid inlet valve seat 24 to form an effective seal. The presence of the annular liquid inlet cavity 25 enables the liquid to be evenly distributed in the valve body, reducing the instability caused by the local pressure difference. In addition, the compact design is conducive to reducing the overall size and facilitating installation and maintenance.

[0035] According to a water-based proportional valve of the present invention, when the liquid return valve core 30 is away from the liquid inlet valve core 20, a middle cavity 26 is provided between the liquid return valve core 30 and the liquid inlet valve seat 24, the position of the T port 12 on the valve sleeve 10 corresponds to the middle cavity 26, and the A port 14 is connected to the T port 12 through the central through hole and the middle cavity 26 in sequence; a liquid return valve seat 32 is provided on the side of the liquid return valve core 30 facing the liquid inlet valve core 20, which is used to block the end of the central through hole when the liquid return valve core 30 is in contact with the liquid inlet valve core 20; the liquid return valve core 30 is also provided with a pressing nail 33, which is installed on the liquid return valve core 30 to press the liquid return valve seat 32 tightly into the installation slot hole of the liquid return valve core 30.

[0036] Specifically, when the liquid return valve core 30 is away from the liquid inlet valve core 20, a central cavity 26 is formed between the liquid return valve core 30 and the liquid inlet valve seat 24, and the position of the T port 12 (liquid return port) on the valve sleeve 10 corresponds to the central cavity 26. The A port 14 (working port) is connected to the T port 12 through the central through hole and the central cavity 26 in turn, realizing the reflux path of the liquid from the A port 14 to the T port 12. In addition, a liquid return valve seat 32 is provided on the side of the liquid return valve core 30 facing the liquid inlet valve core 20, and when the liquid return valve core 30 contacts the liquid inlet valve core 20, the liquid return valve seat 32 can block the end of the central through hole. In order to ensure that the liquid return valve seat 32 fits tightly, the liquid return valve core 30 is also provided with a press pin 33 to press the liquid return valve seat 32 tightly into the mounting slot of the liquid return valve core 30.

[0037] According to a water-based proportional valve of the present invention, a plurality of P ports 11 and T ports 12 are evenly arranged around the valve sleeve 10. Specifically, a plurality of P ports 11 (liquid inlet) and T ports 12 (liquid return port) are evenly arranged around the valve sleeve 10. This porous design not only ensures that the liquid entering the hydraulic system can be more evenly distributed to the annular liquid inlet cavity 25, reduces the formation of local high-pressure points, improves the stability of liquid flow, but also increases the overall flow capacity, effectively avoiding the problem of poor liquid supply or liquid return caused by insufficient flow of a single interface. The evenly distributed P ports 11 and T ports 12 help optimize the flow path of the fluid in the valve and reduce turbulence and resistance losses.

[0038] According to a water-based proportional valve of the present invention, the return liquid valve core 30 includes a first sliding part close to the liquid inlet component and a second sliding part close to the screw plug; the first sliding part is slidably matched with the inner wall of the main hole, the screw plug is provided with a pilot groove, the second sliding part is inserted into the pilot groove and slidably matched with the pilot groove, one side of the pilot groove is provided with a through hole connected to the K port 13, and the pilot control chamber 31 is located in the pilot groove; a balance chamber 34 is formed between the valve sleeve 10, the first sliding part and the screw plug; the return liquid valve core 30 is provided with an internal channel 35, and the balance chamber 34 is connected to the side of the return liquid valve core 30 close to the liquid inlet component through the internal channel 35.

[0039] Specifically, the liquid return valve core 30 includes a first sliding portion close to the liquid inlet assembly and a second sliding portion close to the screw plug. The first sliding portion slides with the inner wall of the main hole to ensure the smooth movement of the liquid return valve core 30 in the axial direction; the screw plug is provided with a pilot groove, the second sliding portion is inserted into the pilot groove and slides with it, and a through hole connected to the K port 13 (high-pressure liquid control port) is provided on one side of the pilot groove, and the pilot control chamber 31 is located in the pilot groove. In addition, a balance chamber 34 is formed between the valve sleeve 10, the first sliding portion and the screw plug; a channel is provided inside the liquid return valve core 30, so that the balance chamber 34 is connected to the side of the liquid return valve core 30 close to the liquid inlet assembly through the internal channel 35. The sliding cooperation between the first sliding portion and the inner wall of the main hole and the second sliding portion and the pilot groove ensures the stable movement of the liquid return valve core 30 under different working conditions and reduces the risk of sticking or deflection. The design of the internal channel 35 of the liquid return valve core 30 not only realizes the communication between the balance chamber 34 and one side of the liquid return valve core 30, but also optimizes the internal fluid path, reduces pressure loss, and improves the efficiency of the entire system. By setting the pilot control chamber 31 in the pilot groove of the screw plug and using the double sliding part structure of the liquid return valve core 30, a compact space layout is achieved, which is conducive to reducing the overall size and facilitating installation and maintenance.

[0040] According to a water-based proportional valve of the present invention, the internal channel 35 includes a small hole structure connected to the pilot control chamber 31; the liquid return assembly includes a floating valve core 36 and a pilot spring 37, the floating valve core 36 is installed in the installation groove of the liquid return valve core 30 facing the pilot control chamber 31, and the pilot spring 37 is used to provide a pre-tightening force to press the floating valve core 36 inside the liquid return valve core 30 to block the small hole structure. Specifically, the internal channel 35 of the liquid return valve core 30 includes a small hole structure connected to the pilot control chamber 31. The liquid return assembly further includes a floating valve core 36 and a pilot spring 37, the floating valve core 36 is installed in the installation groove of the liquid return valve core 30 facing the pilot control chamber 31, and is in a normally closed state under the pre-tightening force of the pilot spring 37, tightly sealing the small hole structure. During operation, high-pressure liquid enters the control chamber through the K port 13, pushing the return valve core 30 to move toward the inlet valve core 20. At the same time, the high-pressure liquid in the control chamber enters the pilot chamber through the hole on the screw plug, acting on the floating valve core 36, so that it forms a tighter conical seal with the return valve core 30, ensuring that the pressure in the pilot control chamber 31 will not easily leak into the balance chamber 34.

[0041] Only when the pressure in the balance chamber 34 or the liquid inlet valve core 20 is greater than the high-pressure liquid pressure in the control chamber, the floating valve core 36 will be triggered to disengage from the small hole structure, allowing the liquid to flow from the balance chamber 34 to the pilot chamber, adjusting the pressure difference on both sides of the return liquid valve core 30, ensuring the accuracy and stability of the valve action, achieving efficient sealing and precise transmission of the pressure in the pilot control chamber 31, and enhancing the reliability and response accuracy of the system.

[0042] According to a water-based proportional valve of the present invention, the liquid return assembly includes a plug 38, which is installed at one end of the liquid return valve core 30 facing the pilot control chamber 31, and the pilot spring 37 is arranged between the plug 38 and the floating valve core 36. The plug 38 is provided with a through hole connecting the inside and outside of the liquid return valve core 30; the floating valve core 36 is conical, and forms a conical surface fit when it contacts the small hole structure. Specifically, the pilot spring 37 is arranged between the plug 38 and the floating valve core 36 to ensure that the floating valve core 36 tightly seals the small hole structure in the normally closed state. The plug 38 is provided with a through hole connecting the inside and outside of the liquid return valve core 30, allowing the high-pressure liquid to enter the control chamber through the K port 13, and then flow into the pilot chamber through this through hole. The floating valve core 36 is conical, and forms a tight conical surface fit when it contacts the small hole structure, further enhancing the sealing effect under the action of the high-pressure liquid.

[0043] During operation, high-pressure liquid enters the control chamber through the K port 13, pushing the return valve core 30 to move toward the inlet valve core 20. At the same time, the high-pressure liquid in the control chamber enters the pilot chamber through the through hole on the plug 38, acting on the floating valve core 36, so that a tighter conical seal is formed between it and the return valve core 30, ensuring that the pressure in the pilot control chamber 31 will not easily leak into the balance chamber 34. Only when the pressure in the balance chamber 34 or the inlet valve core 20 is greater than the high-pressure liquid pressure in the control chamber, the floating valve core 36 will be triggered to disengage from the small hole structure, allowing the liquid to flow from the balance chamber 34 to the pilot chamber, adjusting the pressure difference on both sides of the return valve core 30, and ensuring the accuracy and stability of the valve action.

[0044] like Figure 1 and Figure 2 As shown, a water-based proportional valve according to a preferred embodiment of the present application is composed of a valve sleeve 10, a guide sleeve 22, a liquid inlet valve core 20, a liquid inlet valve seat 24, a main spring 21, a screw plug and a liquid return assembly. Among them, the liquid return assembly includes a liquid return valve core 30, a pressure pin 33, a liquid return valve seat 32, a floating valve core 36 (conical valve core), a pilot spring 37 and a plug 38. The screw plug is installed in the main hole of the valve sleeve 10 through a thread, and the liquid return assembly is placed in the main hole of the valve sleeve 10. A pilot control chamber 31 is formed between the screw plug and the liquid return valve core 30, and the chamber is connected to the K port 13 set on the valve sleeve 10. The balance chamber 34 formed between the valve sleeve 10, the liquid return valve core 30 and the screw plug is connected to the working port A through the internal channel 35. The floating valve core 36 is installed in the installation groove of the liquid return valve core 30 facing the pilot control chamber 31. The pilot spring 37 provides pre-tightening force to make it tightly pressed on the conical surface inside the liquid return valve core 30. The plug 38 is screwed on the end of the liquid return valve core 30. The liquid return valve seat 32 is pressed in the left hole of the liquid return valve core 30 by the pressing nail 33. The liquid inlet valve seat 24 is installed in the valve sleeve 10 and is axially positioned by the boss of the valve sleeve 10; the liquid inlet valve core 20 is coaxially placed in the hole of the liquid inlet valve seat 24, and the annular liquid inlet cavity 25 formed by the guide sleeve 22, the valve sleeve 10, the liquid inlet valve core 20 and the liquid inlet valve seat 24 is connected to the P port 11.

[0045] The working principle of the water-based proportional valve is as follows: in the initial state, the liquid inlet valve core 20 is in a normally closed state under the action of the main spring 21, that is, the liquid inlet valve core 20 is pressed against the wedge surface of the liquid inlet valve seat 24, and the PA port 14 is disconnected; while the liquid return valve core 30 is in a normally open state, and the AT port 12 is connected. The floating valve core 36 is also in a normally closed state under the preload force of the pilot spring 37, blocking the small hole structure.

[0046] During operation, high-pressure liquid enters the control chamber through the K port 13, pushing the return valve core 30 to move toward the inlet valve core 20. At the same time, the high-pressure liquid in the control chamber enters the pilot chamber through the hole on the plug 38, acting on the floating valve core 36, so that a tighter conical seal is formed between it and the return valve core 30. As the return valve core 30 moves toward the inlet valve core 20, under low pressure, the return valve seat 32 contacts the inlet valve core 20, and the AT port 12 is disconnected; as the pressure increases, the elastic force of the main spring 21 is overcome, the main valve port opens, and the PA port 14 is connected. Under different control chamber pressures, the opening of the valve port is different, thereby achieving different output flow rates. When the high-pressure liquid in the control chamber is depressurized, the liquid inlet valve core 20 and the liquid return assembly move to the right under the action of the main spring 21, the liquid inlet valve core 20 contacts the liquid inlet valve seat 24, and the liquid in the middle cavity 26 and the balance cavity 34 is discharged from the K port 13 and the T port 12, returning to the initial state, so that the PA port 14 is disconnected and the AT port 12 is connected.

[0047] The present invention adopts a structure that first pushes the return valve core 30 and then pushes the inlet valve core 20, which reduces the control amount and is easier to make a safe type for underground application. By changing the structure inside the return valve core 30 and adding a one-way floating valve core 36 structure, the reliability of the function is improved. This water-based proportional valve not only simplifies the control logic, but also enhances the reliability and response speed of the system, and is particularly suitable for application requirements in complex working conditions such as underground coal mines.

[0048] The hydraulic support system provided by the present invention is described below. The hydraulic support system described below and the water-based proportional valve described above can be referred to each other.

[0049] The present invention also provides a hydraulic support system, including a push jack, and a water-based proportional valve of the above-mentioned embodiment is arranged on the hydraulic circuit for controlling the push jack. Specifically, the hydraulic support system significantly improves the control accuracy and response speed of the push jack by integrating the above-mentioned water-based proportional valve. In traditional hydraulic control systems, the return valve core and the inlet valve core need to be controlled separately, which makes the system complex and difficult to manage synchronously. The present invention adopts a structural design of pushing the return valve core first and then pushing the inlet valve core together, which simplifies the control logic, reduces the number of control signals required, and makes it easier to achieve the requirements of intrinsically safe (intrinsically safe) equipment, and is particularly suitable for harsh environments such as underground coal mines.

[0050] During operation, when liquid supply operation is required, high-pressure liquid enters the pilot control chamber through port K, pushing the return valve core toward the inlet valve core. At the same time, the high-pressure liquid in the control chamber enters the pilot chamber through the hole on the plug, acting on the floating valve core, forming a tighter conical seal between it and the return valve core. As the return valve core continues to move and contacts the inlet valve core, after overcoming the elastic force of the main spring, port P (inlet port) is connected to port A (working port), allowing high-pressure liquid to flow from port P to port A, thereby driving the push jack to extend or contract, and realizing precise adjustment of the shearer track.

[0051] In addition, when liquid return is required, the control system issues a command to release the pressure at port K, the liquid inlet valve core and liquid return assembly are reset under the action of the main spring, the liquid inlet valve core contacts the liquid inlet valve seat, and the liquid in the middle cavity and the balance cavity is discharged from port K and port T (liquid return port), returning to the initial state, achieving the disconnection of port PA and the connection of port AT, completing the liquid return action. This design ensures the efficient and stable operation of the hydraulic system and improves the action accuracy and reliability of the push jack.

[0052] In summary, the hydraulic support system provided by the present invention realizes more accurate and stable control of the push jack by integrating the optimized designed water-based proportional valve. It not only simplifies the control logic, enhances the reliability and response speed of the system, but also provides an efficient and stable hydraulic control solution for the application requirements of complex working conditions such as underground coal mines. In particular, by introducing a one-way floating valve core structure, the functional reliability and safety of the system are further improved, providing strong technical support for the construction of intelligent mines.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water-based proportional valve, characterized in that: include: The valve sleeve has a main hole in the axial direction, and a P port, a T port and a K port connected to the main hole, one end of the main hole is blocked by a screw plug, and the other end is provided with an A port; A liquid inlet assembly, comprising a liquid inlet valve core and a main spring, wherein the elastic force of the main spring acts on the liquid inlet valve core to disconnect the P port from the A port; A liquid return assembly, comprising a liquid return valve core, wherein a pilot control cavity connected to the K port is formed between the liquid return valve core and the screw plug, and when high-pressure liquid is injected into the pilot control cavity through the K port, the liquid return valve core can be pushed to move toward the liquid inlet valve core; The T port is located between the liquid inlet valve core and the liquid return valve core. When the liquid return valve core moves away from the liquid inlet valve core, the T port is connected to the A port through the liquid inlet valve core; when the liquid return valve core contacts the liquid inlet valve core, the T port is disconnected from the A port; when the liquid return valve core pushes the liquid inlet valve core to move, the P port is connected to the A port.

2. The water-based proportional valve according to claim 1, characterized in that: The liquid inlet assembly includes a guide sleeve, which is fixedly arranged at an end of the main hole opposite to the screw plug, the liquid inlet valve core is slidably matched with the guide sleeve, and the guide sleeve is provided with an inner peripheral flange at one end close to the A port for limiting the displacement of the liquid inlet valve core; The liquid inlet valve core is cylindrical, and a circumferential boss surrounding the liquid inlet valve core is formed on the outer peripheral surface of the liquid inlet valve core. The main spring is sleeved on the liquid inlet valve core and its two ends are respectively supported between the guide sleeve and the circumferential boss.

3. The water-based proportional valve according to claim 2, characterized in that: The liquid inlet assembly comprises a liquid inlet valve seat, the liquid inlet valve seat is fixedly arranged in the main hole, the liquid inlet valve core slides through the liquid inlet valve seat, and when the liquid return valve core is away from the liquid inlet valve core, the circumferential boss contacts the liquid inlet valve seat under the elastic force of the main spring; The contact surface between the circumferential boss and the liquid inlet valve seat is a wedge-shaped surface.

4. The water-based proportional valve according to claim 3, characterized in that: The liquid inlet valve core has a central through hole connected to the A port, and the liquid inlet valve core is also provided with a radial hole connected to the central through hole on the portion that slides with the liquid inlet valve seat; An annular liquid inlet cavity is formed between the guide sleeve, the valve sleeve, the liquid inlet valve core and the liquid inlet valve seat, and the position of the P port on the valve sleeve corresponds to the annular liquid inlet cavity; When the circumferential boss is separated from the liquid inlet valve seat, the A port is connected to the P port via the central through hole, the radial hole and the annular liquid inlet cavity in sequence.

5. The water-based proportional valve according to claim 4, characterized in that: When the liquid return valve core is away from the liquid inlet valve core, a central cavity is provided between the liquid return valve core and the liquid inlet valve seat, the position of the T port on the valve sleeve corresponds to the central cavity, and the A port is connected to the T port through the central through hole and the central cavity in sequence; A liquid return valve seat is provided on one side of the liquid return valve core facing the liquid inlet valve core, and is used to block the end of the central through hole when the liquid return valve core is in contact with the liquid inlet valve core; The liquid return valve core is also provided with a pressing nail, and the pressing nail is installed on the liquid return valve core to press the liquid return valve seat tightly into the installation slot hole of the liquid return valve core.

6. The water-based proportional valve according to any one of claims 1 to 5, characterized in that: The P port and the T port are evenly arranged in plurality around the valve sleeve.

7. The water-based proportional valve according to any one of claims 1 to 5, characterized in that: The liquid return valve core includes a first sliding portion close to the liquid inlet assembly and a second sliding portion close to the screw plug; The first sliding part is slidably matched with the inner wall of the main hole, the screw plug is provided with a pilot groove, the second sliding part is inserted into the pilot groove and slidably matched with the pilot groove, a through hole connected to the K port is provided on one side of the pilot groove, and the pilot control chamber is located in the pilot groove; A balance chamber is formed between the valve sleeve, the first sliding portion and the screw plug; The liquid return valve core is provided with an internal channel, and the balance chamber is connected to a side of the liquid return valve core close to the liquid inlet component through the internal channel.

8. The water-based proportional valve according to claim 7, characterized in that: The internal channel includes a small hole structure communicating with the pilot control cavity; The liquid return assembly includes a floating valve core and a pilot spring. The floating valve core is installed in a mounting groove of the liquid return valve core facing the pilot control chamber. The pilot spring is used to provide a pre-tightening force to press the floating valve core tightly inside the liquid return valve core to block the small hole structure.

9. The water-based proportional valve according to claim 8, characterized in that: The liquid return assembly includes a plug, which is installed at one end of the liquid return valve core facing the pilot control chamber, the pilot spring is arranged between the plug and the floating valve core, and the plug is provided with a through hole communicating with the inside and outside of the liquid return valve core; The floating valve core is conical and forms a conical surface fit when in contact with the small hole structure.

10. A hydraulic support system, characterized in that: It comprises a push jack, and a water-based proportional valve according to any one of claims 1 to 9 is arranged on a hydraulic circuit for controlling the push jack.

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