A valve port independent water-based proportional directional control valve and a control method thereof

Abstract

The present disclosure relates to the technical field of hydraulic control, and provides a valve port independent water-based proportional reversing valve and a control method thereof. The valve port independent water-based proportional reversing valve comprises a first valve control module, a second valve control module and a valve controller. The first valve control module comprises a first liquid inlet spool, a first proportional pilot valve, a first liquid return spool and a first on-off pilot valve. The second valve control module comprises a second liquid inlet spool, a second proportional pilot valve, a second liquid return spool and a second on-off pilot valve. The first valve control module and the second valve control module are further connected with controlled loads, respectively. The valve controller is connected with the first proportional pilot valve, the first on-off pilot valve, the second proportional pilot valve and the second on-off pilot valve, respectively. The present disclosure can accurately control the direction and flow of working medium entering the controlled load, ensure the smooth and reliable operation of the controlled load, prolong the service life of the controlled load and related elements, and has a simple structure and fast response speed.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of hydraulic control, in particular to a valve port independent water-based proportional directional control valve and a control method thereof. BACKGROUND

[0002] At present, the proportional directional control valve is used to control the action of the hydraulic support in the coal mining, and the proportional directional control valve has only two working states of "full opening" and "full closing", that is, the hydraulic support can only move at a constant speed, which is difficult to meet the accurate control of the posture of the hydraulic support and the precise pushing and pulling of the hydraulic support, and the soft start of the hydraulic cylinder cannot be realized, thereby affecting the service life of the hydraulic cylinder and the supporting quality of the working face, and affecting the straightness of the scraper conveyor and reducing the service life of the scraper conveyor. In addition, the existing proportional directional control valve has a complex structure and a slow response speed, resulting in poor control accuracy. SUMMARY

[0003] The purpose of the embodiments of the present disclosure is to provide a valve port independent water-based proportional directional control valve and a control method thereof, so as to at least solve the technical problem of poor control accuracy of the proportional directional control valve in the prior art, which affects the service life of the controlled load such as the hydraulic cylinder.

[0004] In order to solve the above technical problems, the embodiments of the present disclosure adopt the following technical solutions:

[0005] In a first aspect, the embodiments of the present disclosure provide a valve port independent water-based proportional directional control valve, comprising a first valve control module, a second valve control module and a valve controller, the first valve control module comprising a first liquid inlet spool, a first proportional pilot valve, a first liquid return spool and a first on-off pilot valve; the second valve control module comprising a second liquid inlet spool, a second proportional pilot valve, a second liquid return spool and a second on-off pilot valve; the first valve control module and the second valve control module are further connected with a controlled load respectively,

[0006] The valve controller is connected with the first proportional pilot valve, the first on-off pilot valve, the second proportional pilot valve and the second on-off pilot valve respectively, the valve controller controls the on-off and opening degree of the first proportional pilot valve or the second proportional pilot valve, so as to control the on-off and opening degree of the first liquid inlet spool or the second liquid inlet spool, thereby controlling the direction and flow of the working medium entering the controlled load; the valve controller further controls the on-off of the first on-off pilot valve or the second on-off pilot valve, so as to control the on-off of the first liquid return spool or the second liquid return spool.

[0007] In some embodiments, the first liquid inlet spool has a first liquid inlet control cavity, a first liquid inlet of the first valve control module is communicated with the first liquid inlet control cavity through a first damping hole, and the first liquid inlet control cavity is further communicated with a first proportional pilot valve cavity of the first proportional pilot valve;

[0008] The second inlet valve core has a second inlet control cavity, and a second inlet port of the second valve control module is communicated with the second inlet control cavity through a second damping hole, and the second inlet control cavity is also communicated with a second proportional pilot valve cavity of the second proportional pilot valve.

[0009] In some embodiments, the valve port independent water-based proportional switching valve further comprises a valve body, the valve body is provided with an inlet port, a return port, a first load interface and a second load interface, the first inlet valve core, the first return valve core, the second inlet valve core and the second return valve core are arranged in the valve body,

[0010] The inlet port is connected with the first inlet control cavity and the second inlet control cavity respectively, and the return port is connected with the first return control cavity of the first return valve core and the second return control cavity of the second return valve core respectively.

[0011] In some embodiments, a common inlet pipeline connected with the inlet port is arranged in the valve body,

[0012] The common inlet pipeline is connected with a first end of a first inlet pipeline through the first damping hole, a second end of the first inlet pipeline is connected with the first inlet control cavity, and a first proportional pilot valve cavity of the first proportional pilot valve is connected to the first inlet pipeline;

[0013] The common inlet pipeline is connected with a first end of a second inlet pipeline through the second damping hole, a second end of the second inlet pipeline is connected with the second inlet control cavity, and a second proportional pilot valve cavity of the second proportional pilot valve is connected to the second inlet pipeline.

[0014] In some embodiments, a first inlet valve sleeve is arranged in the valve body, the first inlet valve core is movably installed in the first inlet valve sleeve through a first elastic member, the first inlet valve sleeve is provided with a first inlet valve port matched with the first inlet control cavity, and the first inlet valve port is connected with the first load interface;

[0015] A first return valve sleeve is arranged in the valve body, the first return valve core is movably installed in the first return valve sleeve through a second elastic member, the first return valve sleeve is provided with a first return valve port matched with the first return control cavity, and the first return valve port is connected with the first load interface.

[0016] In some embodiments, a second inlet valve sleeve is arranged in the valve body, the second inlet valve core is movably installed in the second inlet valve sleeve through a third elastic member, the second inlet valve sleeve is provided with a second inlet valve port matched with the second inlet control cavity, and the second inlet valve port is connected with the second load interface;

[0017] The valve body is provided with a second return liquid valve sleeve, and the second return liquid valve core is movably installed in the second return liquid valve sleeve through a fourth elastic member. The second return liquid valve sleeve is provided with a second return liquid valve port matched with the second return liquid control cavity, and the second return liquid valve port is connected with the second load interface.

[0018] In some embodiments, the first inlet liquid valve core is connected with a first displacement sensor, and the second inlet liquid valve core is connected with a second displacement sensor.

[0019] In some embodiments, the first proportional pilot valve and the second proportional pilot valve are normally closed valves, and the first on-off pilot valve and the second on-off pilot valve are normally open valves.

[0020] In a second aspect, the embodiments of the present disclosure provide a control method of a valve-port-independent water-based proportional directional valve, which is applied to the valve-port-independent water-based proportional directional valve described above. The method comprises the following steps:

[0021] The valve controller controls the first proportional pilot valve to open according to a first action signal of the controlled load, controls the opening degree of the first inlet liquid valve core according to the opening degree of the first proportional pilot valve, and controls the second on-off pilot valve to open so that the second return liquid valve core is opened, thereby controlling the controlled load to perform a first action; or

[0022] The valve controller controls the second proportional pilot valve to open according to a second action signal of the controlled load, controls the opening degree of the second inlet liquid valve core according to the opening degree of the second proportional pilot valve, and controls the first on-off pilot valve to open so that the first return liquid valve core is opened, thereby controlling the controlled load to perform a second action.

[0023] In some embodiments, the method further comprises:

[0024] The valve controller adjusts the opening degree of the first proportional pilot valve core according to the displacement of the first inlet liquid valve core;

[0025] The valve controller adjusts the opening degree of the second proportional pilot valve core according to the displacement of the second inlet liquid valve core.

[0026] The valve port independent water-based proportional reversing valve and the control method thereof provided by the embodiment of the present disclosure, by setting a first valve control module, a second valve control module and a valve controller, the first valve control module comprises a first liquid inlet valve core, a first proportional pilot valve, a first liquid return valve core and a first switch pilot valve; the second valve control module comprises a second liquid inlet valve core, a second proportional pilot valve, a second liquid return valve core and a second switch pilot valve; the first valve control module and the second valve control module are further connected with controlled loads respectively, the valve controller is connected with the first proportional pilot valve, the first switch pilot valve, the second proportional pilot valve and the second switch pilot valve respectively, the valve controller controls the on-off and opening degree of the first proportional pilot valve or the second proportional pilot valve, so as to control the on-off and opening degree of the first liquid inlet valve core or the second liquid inlet valve core, thereby controlling the direction and flow of the working medium entering the controlled load; the valve controller further controls the on-off of the first switch pilot valve or the second switch pilot valve, so as to control the on-off of the first liquid return valve core or the second liquid return valve core; the valve port independent water-based proportional reversing valve can control the on-off and opening degree of the liquid inlet valve core in each valve control module through the proportional pilot valve arranged in each valve control module, so as to accurately control the direction and flow of the working medium entering the controlled load, at the same time, the on-off of the liquid return valve core in another valve control module is controlled through the switch pilot valve in another valve control module, so that a complete working medium loop is formed, the controlled load can work smoothly and reliably, and the service life of the controlled load and related elements is prolonged; in addition, the valve port independent water-based proportional reversing valve of the embodiment of the present disclosure has simple structure and fast response speed, and further improves the control accuracy of the reversing valve. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 The structure schematic diagram of the valve port independent water-based proportional reversing valve of the embodiment of the present disclosure;

[0029] Figure 2 The overall structure schematic diagram of the valve port independent water-based proportional reversing valve of the embodiment of the present disclosure;

[0030] Figure 3 The structure schematic diagram of the valve port independent water-based proportional reversing valve of the embodiment of the present disclosure; Figure 2 The partial sectional view of the valve port independent water-based proportional reversing valve;

[0031] Figure 4A partial circuit schematic diagram of a valve-port independent type water-based proportional directional valve.

[0032] Reference signs:

[0033] 1-first valve control module, 11-first inlet valve spool, 111-first inlet control cavity, 12-first proportional pilot valve, 13-first return valve spool, 14-first on-off pilot valve, 15-first damping hole; 2-second valve control module, 21-second inlet valve spool, 22-second proportional pilot valve, 23-second return valve spool, 24-second on-off pilot valve, 25-second damping hole; 3-valve body; 4-proportional pilot valve assembly; 5-on-off pilot valve assembly; 61-first inlet valve sleeve, 611-first inlet valve port, 62-first elastic member, 63-first back nut, 64-first screw plug; 71-first return valve sleeve, 711-first return valve port, 72-second elastic member, 73-second back nut, 74-second screw plug; 81-first displacement sensor, 82-second displacement sensor;

[0034] 20-tank; 101-first inlet passage, 102-first return passage, 103-second inlet passage, 104-second return passage, 105-common inlet pipeline, 106-first inlet pipeline, 1061-second end of the first inlet pipeline, 107-second inlet pipeline, 1071-second end of the second inlet pipeline. DETAILED DESCRIPTION

[0035] Various aspects and features of the present disclosure are described herein with reference to the accompanying drawings.

[0036] It is to be understood that various alterations and modifications can be made to the embodiments herein disclosed. Therefore, the above description should not be deemed as limiting, but merely as an example. Other modifications within the scope and spirit of the disclosure will occur to those skilled in the art to which the present disclosure pertains.

[0037] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the present disclosure and, together with the general description of the disclosure given above, and the detailed description of the embodiments given below, serve to explain principles of the present disclosure.

[0038] These and other characteristics of the present disclosure will become apparent from the following description of the preferred forms given, by way of non-limiting example only, with reference to the attached drawings.

[0039] It is also to be understood that even though a number of embodiments of the present disclosure have been described herein, many modifications can be made of these embodiments and their equivalents without departing from the spirit and scope of the disclosure as defined in the following Claims.

[0040] The above and other aspects, features, and advantages of the present disclosure will become more apparent when viewed in conjunction with the following detailed description, taken in conjunction with the accompanying drawings.

[0041] Specific embodiments of the present disclosure are described herein with reference to the accompanying drawings. However, it will be understood that the disclosed embodiments are merely examples of the present disclosure, which can be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, specific structural and functional details disclosed herein are not intended to be limiting, but are merely representative of the present disclosure for the purpose of teaching a person skilled in the art to use the present disclosure in substantially any appropriate detailed structure.

[0042] The present specification can use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which can refer to one or more of the same or different embodiments of the present disclosure.

[0043] Embodiment One

[0044] Figures 1 to 4 A structural schematic diagram of a valve port independent type water-based proportional directional control valve according to an embodiment of the present disclosure is shown, Figure 1 The solid line is the main pipeline of the working medium flow, and the dashed line is the secondary pipeline. As shown in Figures 1 to 4 The present disclosure provides a valve port independent type water-based proportional directional control valve, which includes a first valve control module 1, a second valve control module 2, and a valve controller. The first valve control module 1 includes a first liquid inlet spool 11, a first proportional pilot valve 12, a first liquid return spool 13, and a first switch pilot valve 14. The second valve control module 2 includes a second liquid inlet spool 21, a second proportional pilot valve 22, a second liquid return spool 23, and a second switch pilot valve 24. The first valve control module 1 and the second valve control module 2 are respectively connected to a controlled load,

[0045] The valve controller is connected to the first proportional pilot valve 12, the first switch pilot valve 14, the second proportional pilot valve 22, and the second switch pilot valve 24. The valve controller controls the on-off and opening degree of the first proportional pilot valve 12 or the second proportional pilot valve 22 to control the on-off and opening degree of the first liquid inlet spool 11 or the second liquid inlet spool 21, thereby controlling the direction and flow of the working medium entering the controlled load. The valve controller also controls the on-off of the first switch pilot valve 14 or the second switch pilot valve 24 to control the on-off of the first liquid return spool 13 or the second liquid return spool 23.

[0046] Specifically, the first valve control module 1 further comprises a first liquid inlet, a first liquid return port and a first load interface A. The first liquid inlet is connected with the first liquid inlet spool 11. When the first liquid inlet spool 11 is opened, the working medium in the liquid tank 20 can enter the first liquid inlet spool 11 through the first liquid inlet, and then enter the liquid cavity of the controlled load through the first load interface A which is in communication with the liquid cavity of the controlled load, so as to supply the working medium to the controlled load. The first liquid return port is connected with the first liquid return spool 13 and the liquid tank 20 respectively. When the first liquid return spool 13 is opened, the working medium in the controlled load can flow back to the first liquid return spool 13 through the first load interface A, and then flow back to the liquid tank 20 through the first liquid return port, so as to realize the inflow and outflow of the working medium in the controlled load through the first load interface A.

[0047] Similarly, the second valve control module 2 further comprises a second liquid inlet, a second liquid return port and a second load interface B. The second liquid inlet is connected with the second liquid inlet spool 21. When the second liquid inlet spool 21 is opened, the working medium in the liquid tank 20 can enter the second liquid inlet spool 21 through the second liquid inlet, and then enter the liquid cavity of the controlled load through the second load interface B which is arranged on the second valve control module 2, so as to supply the working medium to the controlled load. The second liquid return port is connected with the second liquid return spool 23 and the liquid tank 20 respectively. When the second liquid return spool 23 is opened, the working medium in the controlled load can flow back to the second liquid return spool 23 through the second load interface B, and then flow back to the liquid tank 20 through the second liquid return port, so as to realize the inflow and outflow of the working medium in the controlled load through the second load interface B.

[0048] The working medium can be water-based medium, hydraulic oil and the like. In the embodiment, the controlled load is taken as a hydraulic cylinder for example, and the working process of the valve port independent type water-based proportional reversing valve is specifically described. The hydraulic cylinder comprises a rod cavity and a rodless cavity. The first valve control module 1 is connected with the rodless cavity through the first load interface A, and the second valve control module 2 is connected with the rod cavity through the second load interface B.

[0049] When the valve port independent water-based proportional reversing valve works, for example, the hydraulic cylinder needs to perform the cylinder extension action, the first load interface A supplies liquid to the hydraulic cylinder, and the second load interface B is used for returning liquid from the hydraulic cylinder. The valve controller controls the first proportional pilot valve 12 to open proportionally, controls the opening of the first liquid inlet spool 11 connected with the first proportional pilot valve 12 by controlling the opening of the first proportional pilot valve 12, supplies liquid to the rodless chamber of the hydraulic cylinder, at the same time, the valve controller controls the first on-off pilot valve 14 to be in the closed state, that is, the liquid return control chamber of the first liquid return spool 13 is closed; at this time, in order to ensure the reliable work of the controlled load, the valve controller controls the second on-off pilot valve 24 to open, opens the second liquid return spool 23 connected with the second on-off pilot valve 24, so that the working medium in the rodless chamber of the hydraulic cylinder flows back to the second liquid return spool 23 and then flows back to the tank 20, realizing the liquid return of the hydraulic cylinder and ensuring the smooth completion of the cylinder extension action of the hydraulic cylinder.

[0050] Similarly, when the hydraulic cylinder needs to perform the cylinder retraction action, the hydraulic cylinder returns liquid through the first load interface A, so that the working medium in the rodless chamber flows into the first liquid return spool 13 and then flows back to the tank 20, the second load interface B is used for supplying liquid to the hydraulic cylinder, the valve controller controls the second proportional pilot valve 22 to open proportionally, controls the opening of the second liquid inlet spool 21 connected with the second proportional pilot valve 22 by controlling the opening of the second proportional pilot valve 22, supplies liquid to the rod chamber of the hydraulic cylinder, at the same time, the valve controller controls the second on-off pilot valve 24 to be in the closed state, that is, the liquid return control chamber of the second liquid return spool 23 is closed; at this time, in order to ensure the reliable work of the controlled load, the valve controller controls the first on-off pilot valve 14 to open, opens the first liquid return spool 13 connected with the first on-off pilot valve 14, so that the working medium can flow back from the rodless chamber of the hydraulic cylinder to the first liquid return spool 13 through the first load interface A connected with the first liquid return spool 13 and then flow back to the tank 20, realizing the liquid return of the hydraulic cylinder and ensuring the smooth completion of the cylinder extension action of the hydraulic cylinder.

[0051] It can be understood that the on-off of the first liquid return spool 13 and the second liquid return spool 23 can be controlled by using the first on-off pilot valve 14 and the second on-off pilot valve 24, and the first liquid return spool 13 and the second liquid return spool 23 are in the fully open or fully closed state when working. The liquid return spool in the fully open state is beneficial to reduce the liquid return flow resistance, so that the controlled load works more smoothly, and the on-off pilot valve has lower cost.

[0052] In other embodiments, the on-off and opening of the first liquid return spool 13 can also be controlled by using a third proportional pilot valve, and the on-off and opening of the second liquid return spool 23 can be controlled by using a fourth proportional pilot valve, so as to control the work of the controlled load more accurately.

[0053] The valve port independent type water-based proportional directional valve provided by the embodiments of the present disclosure comprises a first valve control module 1 and a second valve control module 2, each of which comprises a liquid inlet valve core, a proportional pilot valve, a liquid return valve core and an on-off pilot valve, and the first valve control module 1 and the second valve control module 2 are respectively connected with a controlled load. The proportional pilot valve arranged in each valve control module can control the on-off and opening degree of the liquid inlet valve core in the valve control module, so as to accurately control the direction and flow of the working medium entering the controlled load. Meanwhile, the on-off of the liquid return valve core in the other valve control module is controlled by the on-off pilot valve in the other valve control module, so that a complete working medium loop is formed, the controlled load can work smoothly and reliably (for example, the complete extension and retraction action of the hydraulic cylinder is ensured), and the service life of the controlled load and related elements is prolonged. In addition, the valve port independent type water-based proportional directional valve has simple structure and fast response speed, and the control accuracy of the directional valve is further improved.

[0054] It can be understood that the valve port independent type water-based proportional directional valve in the embodiments of the present disclosure is independent in valve port, that is, the control of the liquid inlet valve core and the liquid return valve core in the same valve control module is independent of each other, and there is no mechanical linkage relationship, so that the control is convenient and the response speed is fast.

[0055] The valve port independent type water-based proportional directional valve is preferably used in a scene where a water-based medium is used in a coal mine working face. The hydraulic cylinder of the hydraulic support can be accurately controlled by using the valve port independent type water-based proportional directional valve, so as to realize accurate control of the posture of the hydraulic support and accurate pushing and pulling of the hydraulic support. The soft start of the hydraulic cylinder can be realized by using the valve port independent type water-based proportional directional valve, the service life of the hydraulic cylinder is improved, the support quality of the working face is improved, the straightness of the scraper conveyor is ensured, and the service life of the scraper conveyor is improved.

[0056] In some embodiments, the first liquid inlet valve core 11 has a first liquid inlet control cavity 111, a first liquid inlet of the first valve control module 1 is communicated with the first liquid inlet control cavity 111 through a first damping hole 15, and the first liquid inlet control cavity 111 is further communicated with a first proportional pilot valve cavity of the first proportional pilot valve 12.

[0057] The second liquid inlet valve core 21 has a second liquid inlet control cavity, a second liquid inlet of the second valve control module 2 is communicated with the second liquid inlet control cavity through a second damping hole 25, and the second liquid inlet control cavity is further communicated with a second proportional pilot valve cavity of the second proportional pilot valve 22.

[0058] When the valve controller controls the first proportional pilot valve 12 to open, the first proportional pilot valve chamber of the first proportional pilot valve 12 is in communication with the first liquid inlet control chamber 111, and the working medium enters the first liquid inlet control chamber 111 through the first proportional pilot valve chamber. Due to the action of the first damping hole 15, a pressure difference is formed between the first liquid inlet and the first liquid inlet control chamber 111, so that the pressure in the first liquid inlet control chamber 111 can be controlled by matching the flow relationship between the first damping hole 15 and the first proportional pilot valve 12, and the opening of the first liquid inlet valve core 11 is controlled. At the same time, the valve controller controls the second switch pilot valve 24 of the second valve control module 2 to conduct work and controls the second liquid return valve core 23 to open, so that the working medium in the controlled load can flow back to the liquid tank 20 through the second liquid return valve core 23. When the first liquid inlet valve core 11 is opened, the valve controller controls the first switch pilot valve 14 and the second proportional pilot valve 22 to close, so that the first liquid return valve core 13 and the second liquid inlet valve core 21 are closed.

[0059] The working process of the second liquid inlet valve core 21 cooperating with the first liquid return valve core 13 is similar to the cooperation of the first liquid inlet valve core 11 and the second liquid return valve core 23, which will not be described here.

[0060] As Figure 1 indicated, the first proportional pilot valve chamber of the first proportional pilot valve 12, the first liquid return control chamber of the first liquid return valve core 13, the first switch pilot valve chamber of the first switch pilot valve 14, the second proportional pilot valve chamber of the second proportional pilot valve 22, the second liquid return control chamber of the second liquid return valve core 23 and the second switch pilot valve chamber of the second switch pilot valve 24 are respectively connected with the liquid tank 20 through pipelines, so as to facilitate the liquid return of each component.

[0061] In some embodiments, as Figure 2 and Figure 3 indicated, the valve port independent type water-based proportional reversing valve further comprises a valve body 3, the valve body 3 is provided with a liquid inlet P, a liquid return port R, a first load interface A and a second load interface B, the first liquid inlet valve core 11, the first liquid return valve core 13, the second liquid inlet valve core 21 and the second liquid return valve core 23 are arranged in the valve body 3,

[0062] The liquid inlet P is connected with the first liquid inlet control chamber 111 of the first liquid inlet valve core 11 and the second liquid inlet valve core 21 respectively, and the liquid return port R is connected with the first liquid return control chamber of the first liquid return valve core 13 and the second liquid return control chamber of the second liquid return valve core 23 respectively.

[0063] In this embodiment, the first valve control module 1 and the second valve control module 2 can be integrated into the same valve body 3. The first liquid inlet of the first valve control module 1 and the second liquid inlet of the second valve control module 2 are both liquid inlets P provided on the valve body 3. The first liquid return port of the first valve control module 1 and the second liquid return port of the second valve control module 2 are both liquid return ports R provided on the valve body 3. The first load interface A and the second load interface B are respectively connected to the controlled load.

[0064] like Figure 1 As shown, the inlet port P, the first inlet valve core 11, and the first load interface A are sequentially connected to form the first inlet channel 101, which can supply liquid to the controlled load; the first load interface A, the first return valve core 13, and the return port R ( Figure 1 (Not shown in the image) and liquid tank 20 are connected in sequence to form the first return channel 102, which allows the working medium in the controlled load to return; the inlet P, the second inlet valve core 21, and the second load interface B are connected in sequence to form the second inlet channel 103, which can supply liquid to the controlled load; the second load interface B, the second return valve core 23, and the return port R ( Figure 1 (Not shown in the image) and liquid tank 20 are connected in sequence to form the second return liquid channel 104, which can allow the working medium in the controlled load to return to the liquid.

[0065] When the controlled load performs the first action (e.g., when the hydraulic cylinder extends), the first inlet channel 101 and the second return channel 104 cooperate to form the first liquid circuit; when the controlled load performs the second action (e.g., when the hydraulic cylinder retracts), the second inlet channel 103 and the first return channel 102 cooperate to form the second liquid circuit, ensuring that the controlled load works smoothly.

[0066] like Figure 2 As shown, the first proportional pilot valve 12 and the second proportional pilot valve 22 can constitute the proportional pilot valve assembly 4, and the first switching pilot valve 14 and the second switching pilot valve 24 can constitute the switching pilot valve assembly 5. The proportional pilot valve assembly 4 and the switching pilot valve assembly 5 are arranged outside the valve body 3, making the water-based proportional directional valve structure more compact, occupying less space, and convenient for connection with the controlled load.

[0067] It is understandable that the quantity of liquid tank 20 may be only one; for ease of description, Figure 1 Each relevant component is connected to a liquid tank 20. The interface on the water-based proportional directional valve that connects to the liquid tank 20 is the return port R. Different components of the water-based proportional directional valve can return to the liquid tank 20 through the same or different return ports R. For example, the first inlet valve core 11 and the second return valve core 13 return liquid through the same return port R on the valve body 3.

[0068] In other embodiments, the first valve control module 1 and the second valve control module 2 can be a separate structure to facilitate the connection of the first valve control module 1 and the second valve control module 2 to the rodless chamber and the rod chamber of the hydraulic cylinder, respectively.

[0069] In some embodiments, such as Figure 4 As shown, the valve body 3 is provided with a common inlet pipe 105 connected to the inlet port P.

[0070] The common inlet pipeline 105 is connected to the first end of the first inlet pipeline 106 through the first damping hole 15, the second end 1061 of the first inlet pipeline is connected to the first inlet control chamber 111, and the first proportional pilot valve chamber of the first proportional pilot valve 12 is connected to the first inlet pipeline 106.

[0071] The common inlet pipeline 105 is connected to the first end of the second inlet pipeline 107 through the second damping hole 25, the second end 1071 of the second inlet pipeline is connected to the second inlet control chamber, and the second proportional pilot valve chamber of the second proportional pilot valve 22 is connected to the second inlet pipeline 107.

[0072] The common inlet pipeline 105, the first inlet pipeline 106, the second inlet pipeline 107, the inlet pipeline connected to the first proportional pilot valve chamber of the first proportional pilot valve 12, and the inlet pipeline connected to the second proportional pilot valve chamber of the second proportional pilot valve 22 can be integrally formed by casting within the valve body 3. The first damping orifice 15 and the second damping orifice 25 are respectively located on the upper and lower sides of the common inlet pipeline 105. Then, the first inlet pipeline 106 and the second inlet pipeline 107 are horizontally arranged and connected to the first inlet control chamber 111 and the second inlet control chamber, respectively. The first proportional pilot valve chamber of the first proportional pilot valve 12 is connected to the pipe body of the first inlet pipeline 106, and the first proportional pilot valve chamber of the second proportional pilot valve 22 is connected to the pipe body of the second inlet pipeline 107. The pipeline arrangement within the valve body 3 is reasonable, which facilitates the timely response of the inlet valve core to the proportional pilot valve. At the same time, it facilitates the formation of a pressure difference through the upper and lower first damping orifice 15 and the second damping orifice 25.

[0073] In some embodiments, such as Figure 3 As shown, the valve body 3 is provided with a first inlet valve sleeve 61, and the first inlet valve core 11 is movably installed in the first inlet valve sleeve 61 through the first elastic element 62. The first inlet valve sleeve 61 is provided with a first inlet valve port 611 that cooperates with the first inlet control chamber 111. The first inlet valve port 611 is connected to the first load interface A.

[0074] The valve body 3 is provided with a first return liquid valve sleeve 71, and the first return liquid valve core 13 is movably installed in the first return liquid valve sleeve 71 through a second elastic member 72. The first return liquid valve sleeve 71 is provided with a first return liquid valve port 711 matched with the first return liquid control cavity. The first return liquid valve port 711 is connected with the first load interface A.

[0075] One end of the first inlet liquid valve sleeve 61 is fixed through a first back nut 63 and a first screw plug 64. The first inlet liquid valve core 11 is movably installed in the first inlet liquid valve sleeve 61 and forms a first inlet liquid control cavity 111 in cooperation with the first inlet liquid valve sleeve 61. The first elastic member 62 is connected between the first inlet liquid valve sleeve 61 and the first screw plug 64. The first proportional pilot valve 12 is opened to work, so that the first inlet liquid valve port 611 on the first inlet liquid valve sleeve 61 is opened to communicate with the first load interface A. The working medium flowing through the first load interface A pushes the first inlet liquid valve core 11 to move, adjusts the opening degree of the first inlet liquid valve port 611, and controls the flow entering the controlled load through the first load interface A. Similar to the structure of the first inlet liquid valve core 11, one end of the first return liquid valve sleeve 71 is fixed through a second back nut 73 and a second screw plug 74. The first return liquid valve core 13 is movably installed in the first return liquid valve sleeve 71 and forms a first return liquid control cavity in cooperation with the first return liquid valve sleeve 71. The second elastic member 72 is connected between the first return liquid valve sleeve 71 and the second screw plug 74. The first on-off pilot valve 14 is opened to work, so that the first return liquid valve port 711 on the first return liquid valve sleeve 71 is opened to communicate with the first load interface A, so that the working medium in the controlled load flows back to the liquid tank 20 through the first load interface A.

[0076] Similarly, the valve body 3 is provided with a second inlet liquid valve sleeve. The second inlet liquid valve core 21 is movably installed in the second inlet liquid valve sleeve through a third elastic member. The second inlet liquid valve sleeve is provided with a second inlet liquid valve port matched with the second inlet liquid control cavity. The second inlet liquid valve port is connected with the second load interface B.

[0077] The valve body 3 is provided with a second return liquid valve sleeve. The second return liquid valve core 23 is movably installed in the second return liquid valve sleeve through a fourth elastic member. The second return liquid valve sleeve is provided with a second return liquid valve port matched with the second return liquid control cavity. The second return liquid valve port is connected with the second load interface B.

[0078] The second inlet liquid valve core 21 and the second return liquid valve core 23 in the valve body 3 are similar in structure and arrangement to the first inlet liquid valve core 11 and the first return liquid valve core 13, which will not be described here.

[0079] Optionally, in this embodiment, each inlet valve core and return valve core adopts a cone valve structure, which can ensure sealing performance under zero opening conditions, is more suitable for high water-based working environments, effectively reduces internal leakage, and ensures the pressure and flow characteristics of the valve to meet the usage requirements of working conditions of water-based media in coal mines, and has a wide range of applications.

[0080] In some embodiments, such as Figure 2 and Figure 3 As shown, the first inlet valve core 11 is connected to a first displacement sensor 81, and the second inlet valve core 21 is connected to a second displacement sensor 82.

[0081] The first displacement sensor 81 and the second displacement sensor 82 are respectively connected to the valve controller. The displacement of the first inlet valve core 11 and the second inlet valve core 21 can be monitored in real time through the first displacement sensor 81 and the second displacement sensor 82. The valve controller adjusts the flow rate between the corresponding proportional pilot valve and the damping orifice (adjusting the output pressure of the proportional pilot valve) according to the displacement of the first inlet valve core 11 and the second inlet valve core 21 using PID closed-loop algorithm, etc., automatically matching the hydraulic balance relationship, matching the pressure of the inlet control chamber of the inlet valve core, and thus adjusting the opening of the inlet valve core and improving the response speed of the inlet valve core.

[0082] In some embodiments, the first proportional pilot valve 12 and the second proportional pilot valve 22 are normally closed valves, and the first switching pilot valve 14 and the second switching pilot valve 24 are normally open valves. Setting the first proportional pilot valve 12 and the second proportional pilot valve 22 as normally closed valves enables the hydraulic cylinder to self-lock upon power failure, reducing energy consumption and extending its service life. For example, when the hydraulic cylinder is stationary at a certain position, the valve controller can control the proportional pilot valve connected to the inlet valve core to self-lock upon power failure, preventing the working medium from continuing to flow in, thus achieving self-locking of the hydraulic cylinder position, ensuring reliable stationary position of the hydraulic cylinder, and making it more energy-efficient and reliable. Setting the first switching pilot valve 14 and the second switching pilot valve 24 as normally open valves can improve the response speed of the switching pilot valves, ensuring reliable return of the working medium and thus ensuring the complete and smooth operation of the controlled load. For example, when the first proportional pilot valve 12 opens to control the hydraulic cylinder to extend, the valve controller only needs to close the first switch pilot valve 14, while the second switch pilot valve 24 remains open. This forms a complete liquid circuit with the controlled load, making control convenient and quick, so that the controlled load can perform the corresponding actions in a timely manner.

[0083] In specific implementation, the specific types of the first proportional pilot valve 12, the first switching pilot valve 14, the second proportional pilot valve 22, and the second switching pilot valve 24 can be determined according to the actual working conditions, and this disclosure does not specifically limit them. For example, the first proportional pilot valve 12, the first switching pilot valve 14, the second proportional pilot valve 22, and the second switching pilot valve 24 can all be set as normally closed valves or normally open valves.

[0084] Embodiment Two

[0085] The control method of the valve port independent water-based proportional directional control valve provided by the embodiments of the present disclosure is applied to a valve controller of the valve port independent water-based proportional directional control valve described above, and the method comprises:

[0086] The valve controller controls the first proportional pilot valve to open according to a first action signal of the controlled load, controls the opening degree of the first liquid inlet spool according to the opening degree of the first proportional pilot valve, and controls the second switching pilot valve to open so as to open the second liquid return spool, thereby controlling the controlled load to perform a first action; or

[0087] The valve controller controls the second proportional pilot valve to open according to a second action signal of the controlled load, controls the opening degree of the second liquid inlet spool according to the opening degree of the second proportional pilot valve, and controls the first switching pilot valve to open so as to open the first liquid return spool, thereby controlling the controlled load to perform a second action.

[0088] The first action and the second action are opposite actions, for example, the cylinder extension action and the cylinder retraction action of a hydraulic cylinder. The first action and the second action can also be related actions.

[0089] In some embodiments, the method further comprises:

[0090] The valve controller adjusts the opening degree of the first proportional pilot spool according to the displacement of the first liquid inlet spool;

[0091] The valve controller adjusts the opening degree of the second proportional pilot spool according to the displacement of the second liquid inlet spool.

[0092] The control method of the valve port independent water-based proportional directional control valve provided by the embodiments of the present disclosure corresponds to the valve port independent water-based proportional directional control valve described above, and any optional item in the valve port independent water-based proportional directional control valve embodiment is also applicable to the control method of the valve port independent water-based proportional directional control valve, which will not be described here.

[0093] The above description is merely preferred embodiments of the present disclosure and a description of the principles of the technology applied. It should be understood by those skilled in the art that the disclosed range of the present disclosure is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combinations of the technical features described above or their equivalent features without departing from the disclosed concept. For example, the technical solutions formed by the mutual replacement of the above-described features and the technical features disclosed in the present disclosure (but not limited to) having similar functions.

[0094] Moreover, while operations are depicted in a particular order, this should not be understood as requiring such an order nor infringing on the scope of the disclosure. Certain of the operations described in the discussion are combinable into a single operation, and certain operations can be separated into several operations. In some embodiments, the operations described in the discussion can be performed in an order different than presented in the discussion. In some embodiments, the operations described in the discussion can be performed concurrently. Also, while several specific implementation details are discussed in the discussion, these should not be interpreted as limiting the scope of the disclosure. Rather, certain features described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable sub-combination.

[0095] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A valve ported independent water-based proportional directional control valve, characterized by, The valve control system comprises a first valve control module, a second valve control module and a valve controller, the first valve control module comprises a first inlet valve core, a first proportional pilot valve, a first return valve core and a first switch pilot valve, the second valve control module comprises a second inlet valve core, a second proportional pilot valve, a second return valve core and a second switch pilot valve, the first valve control module and the second valve control module are further connected with controlled loads respectively, The valve controller is connected with the first proportional pilot valve, the first switch pilot valve, the second proportional pilot valve and the second switch pilot valve respectively, the valve controller controls the on-off and opening degree of the first proportional pilot valve or the second proportional pilot valve, so as to control the on-off and opening degree of the first inlet valve core or the second inlet valve core, thereby controlling the direction and flow of working medium entering the controlled load, and the valve controller further controls the on-off of the first switch pilot valve or the second switch pilot valve, so as to control the on-off of the first return valve core or the second return valve core.

2. The valve-in-line independent water-based proportional directional control valve according to claim 1, characterized in that, The first inlet valve core has a first inlet control cavity, a first inlet of the first valve control module is communicated with the first inlet control cavity through a first damping hole, and the first inlet control cavity is further communicated with a first proportional pilot valve cavity of the first proportional pilot valve; The second inlet valve core has a second inlet control cavity, a second inlet of the second valve control module is communicated with the second inlet control cavity through a second damping hole, and the second inlet control cavity is further communicated with a second proportional pilot valve cavity of the second proportional pilot valve.

3. The valve-in-line independent water-based proportional directional control valve according to claim 2, characterized in that, The valve port independent type water-based proportional reversing valve further comprises a valve body, the valve body is provided with an inlet port, a return port, a first load interface and a second load interface, the first inlet valve core, the first return valve core, the second inlet valve core and the second return valve core are arranged in the valve body, The inlet port is connected with the first inlet control cavity and the second inlet control cavity respectively, and the return port is connected with a first return control cavity of the first return valve core and a second return control cavity of the second return valve core respectively.

4. The valve-in-line independent water-based proportional directional control valve according to claim 3, characterized in that, A common inlet pipeline is arranged in the valve body and connected with the inlet port, The common inlet pipeline is connected with a first end of a first inlet pipeline through the first damping hole, a second end of the first inlet pipeline is connected with the first inlet control cavity, and a first proportional pilot valve cavity of the first proportional pilot valve is connected to the first inlet pipeline; The common inlet pipeline is connected with a first end of a second inlet pipeline through the second damping hole, a second end of the second inlet pipeline is connected with the second inlet control cavity, and a second proportional pilot valve cavity of the second proportional pilot valve is connected to the second inlet pipeline.

5. The valve-in-line independent water-based proportional directional control valve according to claim 3, characterized in that, A first inlet valve sleeve is arranged in the valve body, the first inlet valve core is movably installed in the first inlet valve sleeve through a first elastic member, the first inlet valve sleeve is provided with a first inlet valve port matched with the first inlet control cavity, and the first inlet valve port is connected with the first load interface; The valve body is provided with a first return liquid valve sleeve, the first return liquid valve core is movably installed in the first return liquid valve sleeve through a second elastic element, the first return liquid valve sleeve is provided with a first return liquid valve port matched with the first return liquid control cavity, and the first return liquid valve port is connected with the first load interface.

6. The valve-in-line independent water-based proportional directional control valve according to claim 3, characterized in that, The valve body is provided with a second inlet liquid valve sleeve, the second inlet liquid valve core is movably installed in the second inlet liquid valve sleeve through a third elastic element, the second inlet liquid valve sleeve is provided with a second inlet liquid valve port matched with the second inlet liquid control cavity, and the second inlet liquid valve port is connected with the second load interface. The valve body is provided with a second return liquid valve sleeve, the second return liquid valve core is movably installed in the second return liquid valve sleeve through a fourth elastic element, the second return liquid valve sleeve is provided with a second return liquid valve port matched with the second return liquid control cavity, and the second return liquid valve port is connected with the second load interface.

7. The valve-in-line independent water-based proportional directional control valve according to claim 1, characterized by The first inlet liquid valve core is connected with a first displacement sensor, and the second inlet liquid valve core is connected with a second displacement sensor.

8. The valve-in-line independent water-based proportional directional control valve according to claim 1, characterized by The first proportional pilot valve and the second proportional pilot valve are normally closed valves, and the first on-off pilot valve and the second on-off pilot valve are normally open valves.

9. A control method of a valve port independent type water-based proportional directional control valve, characterized by, The method applied to the valve port independent type water-based proportional switching valve is applied to any one of claims 1 to 8, and the method comprises: The valve controller controls the first proportional pilot valve to open according to the first action signal of the controlled load, controls the opening degree of the first inlet liquid valve core according to the opening degree of the first proportional pilot valve, controls the second on-off pilot valve to open, so that the second return liquid valve core is opened, and thus the controlled load is controlled to perform the first action; or The valve controller controls the second proportional pilot valve to open according to the second action signal of the controlled load, controls the opening degree of the second inlet liquid valve core according to the opening degree of the second proportional pilot valve, controls the first on-off pilot valve to open, so that the first return liquid valve core is opened, and thus the controlled load is controlled to perform the second action.

10. The control method of the valve port independent type water-based proportional directional control valve according to claim 9, characterized by, The method further comprises: The valve controller adjusts the opening degree of the first proportional pilot valve core according to the displacement of the first inlet liquid valve core; The valve controller adjusts the opening degree of the second proportional pilot valve core according to the displacement of the second inlet liquid valve core.

Images