A pilot-operated water-based digital valve and hydraulic system

Abstract

The present invention provides a pilot-operated water-based digital valve and hydraulic system. The pilot-operated water-based digital valve comprises a pilot valve, a main valve, and first through fourth cone valve cores. The pilot valve has a first valve chamber, which includes a first high-pressure chamber, a first chamber, a first low-pressure chamber, a second chamber, and a second high-pressure chamber, arranged in sequence. The main valve has a second valve chamber, which includes a third chamber, a third high-pressure chamber, a second low-pressure chamber, a fourth high-pressure chamber, and a fourth chamber, arranged in sequence. The first cone valve core is used to connect and block the first high-pressure chamber and the first chamber. The second cone valve core is used to connect and block the second high-pressure chamber and the second chamber. The third cone valve core is used to connect and block the third high-pressure chamber and the first oil inlet and outlet. The fourth cone valve core is used to connect and block the fourth high-pressure chamber and the second oil inlet and outlet. The pilot-operated water-based digital valve of the present invention has the advantages of high linearity, high control accuracy, fast response speed, and low leakage.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic technology, and in particular to a pilot-operated water-based digital valve and a hydraulic system. Background Art

[0002] With the promotion of electronic information technology in the field of hydraulic transmission, the problems of traditional hydraulic control systems such as sensitivity to pollution, low efficiency, and susceptibility to interference have become increasingly prominent. Digital hydraulic technology has demonstrated strong advantages in response speed, anti-interference, energy saving, fault tolerance, and versatility. In particular, the control form of digital signals is simpler and meets the requirements of information interfaces such as computers and the Internet. It can reduce the accuracy loss, time delay and cost increase caused by A / D and D / A conversion. Therefore, digital hydraulics in the modern sense has received widespread attention as soon as it was proposed, and is called the future hydraulic technology.

[0003] Digital valves use stepper motors or servo motors controlled by digital signals as electro-mechanical conversion elements, and rely on a screw structure to convert the motor's rotation angle into the linear opening of the valve core. This type of valve has the advantages of high repeatability, no hysteresis, and no need for D / A conversion and linear amplifiers, which is more conducive to the digital control and intelligent development of hydraulic systems.

[0004] In related technologies, sensors are generally used to detect the position of the valve core and provide position feedback, and electro-hydraulic feedback is used to control the output of the proportional solenoid to the valve core. However, this electro-hydraulic feedback method has a certain signal delay, which will reduce the control accuracy of the valve core. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, an embodiment of the present invention proposes a pilot-operated water-based digital valve, which has the advantages of high linearity, high control accuracy, fast response speed, and is not prone to leakage.

[0007] An embodiment of the present invention provides a hydraulic system having the advantages of high linearity, high control accuracy, fast response speed, and low leakage.

[0008] The pilot-operated water-based digital valve according to an embodiment of the present invention comprises:

[0009] A pilot valve having a first valve chamber, the first valve chamber including a first high-pressure chamber, a first chamber, a first low-pressure chamber, a second chamber, and a second high-pressure chamber arranged in sequence, the pilot valve including a first valve core, the first valve core being inserted into the pilot valve and movable along an axis of the first valve core;

[0010] The main valve has a second valve chamber, the second valve chamber includes a third chamber, a third high-pressure chamber, a second low-pressure chamber, a fourth high-pressure chamber and a fourth chamber arranged in sequence, the main valve includes a second valve core, the second valve core is inserted into the main valve, and the second valve core is movable along the axis of the second valve core.

[0011] The main valve further comprises a high-pressure oil port, a low-pressure oil port, a first oil inlet and outlet port, and a second oil inlet and outlet port. The first to fourth high-pressure chambers are all in communication with the high-pressure oil port, the first low-pressure chamber and the second low-pressure chamber are both in communication with the low-pressure oil port, the first chamber is in communication with the third chamber, and the second chamber is in communication with the fourth chamber.

[0012] The first cone valve core to the fourth cone valve core, the first cone valve core and the second cone valve core are sleeved on the first valve core and are movable along the axis of the first valve core, the third cone valve core and the fourth cone valve core are sleeved on the second valve core and are movable along the axis of the second valve core, the first cone valve core is located in the first high-pressure chamber and is used to conduct and block the first high-pressure chamber and the first chamber, the second cone valve core is located in the second high-pressure chamber and is used to conduct and block the second high-pressure chamber and the second chamber, the third cone valve core is located in the third high-pressure chamber and is used to conduct and block the third high-pressure chamber and the first inlet and outlet oil ports, and the fourth cone valve core is located in the fourth high-pressure chamber and is used to conduct and block the fourth high-pressure chamber and the second inlet and outlet oil ports.

[0013] The pilot water-based digital valve of the embodiment of the present invention drives the movement of at least two of the first cone valve core to the fourth cone valve core through the movement of the first valve core and the second valve core, thereby realizing the conduction and switching function of the pilot water-based digital valve of the embodiment of the present invention. The first cone valve core and the second cone valve core can be driven by a motor, etc. to facilitate the control of the displacement of the first valve core and the second valve core, thereby improving the linearity of the pilot water-based digital valve of the embodiment of the present invention. In addition, the first valve core and the second valve core are driven by a motor, which can also make the cone valve core have a relatively constant movement rate, thereby improving the stability of the use of the pilot water-based digital valve of the embodiment of the present invention.

[0014] In addition, for example, by using the first cone valve core to block the first high-pressure chamber and the first chamber, the sealing between the first high-pressure chamber and the first chamber can be improved to prevent leakage of liquid with low viscosity.

[0015] Therefore, the pilot-operated water-based digital valve according to the embodiment of the present invention has the advantages of high linearity, high control accuracy, fast response speed, and low leakage.

[0016] In some embodiments, the pilot-operated water-based digital valve has a first state and a second state. In the first state, the first cone valve core connects the first high-pressure chamber and the first chamber, and the liquid in the first high-pressure chamber flows into the third chamber through the first chamber. The first low-pressure chamber is connected to the second chamber, and the liquid in the first low-pressure chamber flows into the fourth chamber through the second chamber to move the second valve core. The fourth cone valve core connects the fourth high-pressure chamber and the second oil inlet and outlet, and the low-pressure chamber is connected to the first oil inlet and outlet.

[0017] In the second state, the second cone valve core connects the second chamber and the second high-pressure chamber, the liquid in the second high-pressure chamber flows into the fourth chamber through the second chamber, the first low-pressure chamber is connected to the first chamber, and the liquid in the first low-pressure chamber flows into the third chamber through the first chamber, so that the second valve core moves, the third cone valve core connects the third high-pressure chamber and the first inlet and outlet oil ports, and the second low-pressure chamber is connected to the second inlet and outlet oil ports.

[0018] In some embodiments, the device further includes first to fourth valve seats, each of which has a cavity. The first valve seat is located in the first high-pressure cavity, and the cavity of the first valve seat is communicated with the first high-pressure cavity. The first cone valve core is disposed in the cavity of the first valve seat and is used to connect and block the cavity of the first valve seat and the first cavity.

[0019] The second valve seat is located in the second high-pressure chamber, the cavity of the second valve seat is communicated with the second high-pressure chamber, and the second cone valve core is arranged in the cavity of the second valve seat and is used to connect and block the cavity of the second valve seat and the second chamber;

[0020] The third valve seat is located in the third high-pressure chamber, and the cavity of the third valve seat is communicated with the third high-pressure chamber. The third cone valve core is arranged in the cavity of the third valve seat and is used to connect and block the cavity of the third valve seat and the first oil inlet and outlet.

[0021] The fourth valve seat is located in the fourth high-pressure chamber, the cavity of the fourth valve seat is connected to the fourth high-pressure chamber, and the fourth cone valve core is arranged in the cavity of the fourth valve seat and is used to conduct and block the cavity of the fourth valve seat and the second oil inlet and outlet.

[0022] In some embodiments, the valve seat further comprises first to fourth elastic members, the first valve seat further comprises a first opening, the first opening being provided on a side of the first valve seat adjacent to the first cavity, the first opening communicating with the cavity of the first valve seat and the first cavity, the first elastic member being connected between a bottom wall of the cavity of the first valve seat and the first conical valve core, so that the first conical valve core blocks the first opening;

[0023] The second valve seat further includes a second opening, which is provided on a side of the second valve seat adjacent to the second cavity. The second opening communicates between the cavity of the second valve seat and the second cavity. The second elastic member is connected between the bottom wall of the cavity of the second valve seat and the second cone valve core, so that the second cone valve core blocks the second opening.

[0024] The third valve seat further includes a third opening, which is provided on a side of the third valve seat adjacent to the first oil inlet and outlet, the third opening communicating with the cavity of the third valve seat and the first oil inlet and outlet, and the third elastic member being connected between the bottom wall of the cavity of the third valve seat and the third cone valve core, so that the third cone valve core blocks the third opening;

[0025] The fourth valve seat also includes a fourth opening, which is arranged on a side of the fourth valve seat adjacent to the second oil inlet and outlet. The fourth opening connects the cavity of the fourth valve seat and the second oil inlet and outlet. The fourth elastic member is connected between the bottom wall of the cavity of the fourth valve seat and the fourth cone valve core, so that the fourth cone valve core blocks the fourth opening.

[0026] In some embodiments, the first cone valve core has a first circumferential wall surface and a first side surface and a second side surface opposite to each other along the axial direction of the first valve core, the first circumferential wall surface contacts the circumferential wall surface of the cavity of the first valve seat, and the first cone valve core further includes at least one first communicating hole, the first communicating hole passing through the first side surface and the second side surface;

[0027] The second conical valve core has a second circumferential wall surface and a third side surface and a fourth side surface opposite to each other along the axial direction of the first valve core, the second circumferential wall surface contacts the circumferential wall surface of the cavity of the second valve seat, and the second conical valve core further includes at least one second communicating hole, the second communicating hole passing through the third side surface and the fourth side surface;

[0028] The third cone valve core has a third circumferential wall surface and a fifth side surface and a sixth side surface opposite to each other along the axial direction of the second valve core, the third circumferential wall surface contacts the circumferential wall surface of the cavity of the third valve seat, and the third cone valve core further includes at least one third communicating hole, the third communicating hole passing through the fifth side surface and the sixth side surface;

[0029] The fourth conical valve core has a fourth circumferential wall surface and a seventh side surface and an eighth side surface opposite to each other along the axial direction of the second valve core. The fourth circumferential wall surface contacts the circumferential wall surface of the cavity of the fourth valve seat. The fourth conical valve core also includes at least one fourth communicating hole, and the fourth communicating hole passes through the seventh side surface and the eighth side surface.

[0030] In some embodiments, the first valve core further includes a first protrusion and a second protrusion, the first protrusion is located in the first cavity and is adjacent to the first cone valve core, the second protrusion is located in the second cavity and is adjacent to the second cone valve core, the second valve core includes a third protrusion and a fourth protrusion, the third protrusion and the fourth protrusion are located between the third cone valve core and the fourth cone valve core on the axis of the second valve core, the third protrusion is adjacent to the third cone valve core, and the fourth protrusion is adjacent to the fourth cone valve core.

[0031] In the first state, the first protrusion abuts against the first cone valve core, so that the first cone valve core conducts communication between the cavity of the first valve seat and the first cavity, and the fourth protrusion abuts against the fourth cone valve core, so that the fourth cone valve core conducts communication between the fourth high-pressure cavity and the second oil inlet and outlet.

[0032] In the second state, the second protrusion abuts against the second cone valve core, so that the second cone valve core connects the cavity of the second valve seat and the second cavity, and the third protrusion abuts against the third cone valve core, so that the third cone valve core connects the third high-pressure cavity and the first oil inlet and outlet.

[0033] In some embodiments, it also includes a first guide member and a second guide member, the first guide member is arranged in the first valve cavity, the first valve core is provided with a first guide portion matching the first guide member, the second guide member is arranged in the second valve cavity, and the second valve core is provided with a second guide portion matching the second guide member.

[0034] In some embodiments, the invention further comprises a first connecting member and a second connecting member, wherein the first connecting member comprises a first connecting portion and a first matching portion, and the second connecting member comprises a second connecting portion and a second matching portion.

[0035] The first connecting portion is connected to the second end of the first valve core, the second connecting portion is connected to the second end of the second valve core, and the first matching portion is connected to the second matching portion, so that the second connecting member rotates and drives the first connecting member to rotate.

[0036] In some embodiments, a driving member is further included, wherein the driving member includes a driving portion, and the driving portion is connected to the first valve core to drive the first valve core to rotate.

[0037] The hydraulic system of an embodiment of the present invention includes a pilot water-based digital valve and a hydraulic cylinder. The pilot water-based digital valve is the pilot water-based digital valve according to any one of the above embodiments. The pilot water-based digital valve is connected to the hydraulic cylinder to drive the piston rod of the hydraulic cylinder to move. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the structure of the hydraulic system of the embodiment of the present invention.

[0039] Figure 2 yes Figure 1 An enlarged schematic diagram of A is shown in FIG.

[0040] Reference numerals:

[0041] Pilot valve 10; first valve chamber 101; first high-pressure chamber 1011; first chamber 1012; first low-pressure chamber 1013; second chamber 1014; second high-pressure chamber 1015;

[0042] Main valve 11; second valve chamber 111; third chamber 1111; second low-pressure chamber 1112; fourth chamber 1113; high-pressure oil port 1114; low-pressure oil port 1115; first oil inlet and outlet 1116; second oil inlet and outlet 1117;

[0043] First valve core 21; first protrusion 211; second protrusion 212; first guide portion 213;

[0044] The second valve core 22; the third protrusion 221; the fourth protrusion 222; the second guide portion 223;

[0045] First valve seat 31; first elastic member 311; first cone valve core 312; first peripheral wall surface 3121; first side surface 3122; second side surface 3123; first communication hole 3124;

[0046] Second valve seat 32; first elastic member 321; second cone valve core 322; second peripheral wall surface 3221; third side surface 3222; fourth side surface 3223; second communication hole 3224;

[0047] The third valve seat 33; the first elastic member 331; the third cone valve core 332; the third peripheral wall surface 3321; the fifth side surface 3322; the sixth side surface 3323; the third communication hole 3324;

[0048] Fourth valve seat 34; first elastic member 341; fourth cone valve core 342; fourth peripheral wall surface 3421; seventh side surface 3422; eighth side surface 3423; fourth communication hole 3424;

[0049] a first guide member 41;

[0050] a second guide member 42;

[0051] First connecting member 51; first connecting portion 511; first matching portion 512;

[0052] Second connecting member 52; second connecting portion 521; second matching portion 522;

[0053] Driving member 6; driving portion 61. DETAILED DESCRIPTION

[0054] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0055] The pilot-operated water-based digital valve according to the embodiment of the present invention includes: a pilot valve 10 , a main valve 11 , a first cone valve core 312 , a second cone valve core 322 , a third cone valve core 332 and a fourth cone valve core 332 .

[0056] The pilot valve 10 has a first valve chamber 101, which includes a first high-pressure chamber 1011, a first chamber 1012, a first low-pressure chamber 1013, a second chamber 1014 and a second high-pressure chamber 1015 arranged in sequence. The pilot valve 10 includes a first valve core 21, which is inserted into the pilot valve 10 and is movable along the axis of the first valve core 21.

[0057] The main valve 11 has a second valve chamber 111, which includes a third chamber 1111, a third high-pressure chamber, a second low-pressure chamber 1112, a fourth high-pressure chamber and a fourth chamber 1113 arranged in sequence. The main valve 11 includes a second valve core 22, which is inserted into the main valve 11 and movable along the axis of the second valve core 22. The main valve 11 also has a high-pressure oil port 1114, a low-pressure oil port 1115, a first inlet and outlet oil port 1116 and a second inlet and outlet oil port 1117. The first high-pressure chamber 1011 to the fourth high-pressure chamber are all connected to the high-pressure oil port 1114, the first low-pressure chamber 1013 and the second low-pressure chamber 1112 are both connected to the low-pressure oil port 1115, the first chamber 1012 is connected to the third chamber 1111, and the second chamber 1014 is connected to the fourth chamber 1113, wherein the high-pressure oil port 1114 is used to pass high-pressure liquid, and the low-pressure oil port 1115 is used to pass low-pressure liquid.

[0058] Specifically, if Figure 1 and Figure 2 As shown, the first valve cavity 101 and the second valve cavity 111 both extend in the left-right direction, the extension direction of the first valve core 21 and the second valve core 22 are consistent with the left-right direction, the left end of the first valve core 21 is the first end of the first valve core 21, the right end of the first valve core 21 is the second end of the first valve core 21, the left end of the second valve core 22 is the first end of the second valve core 22, the right end of the second valve core 22 is the second end of the second valve core 22, and the first valve core 21 and the second valve core 22 are movable in the left-right direction.

[0059] It is understandable that the left end of the first valve core 21 can be connected to a driving device such as a motor to drive the first valve core 21 to rotate.

[0060] The first cone valve core 312 to the fourth cone valve core 332, the first cone valve core 312 and the second cone valve core 322 are sleeved on the first valve core 21 and are movable along the axis of the first valve core 21, the third cone valve core 332 and the fourth cone valve core 332 are sleeved on the second valve core 22 and are movable along the axis of the second valve core 22, the first cone valve core 312 is located in the first high-pressure chamber 1011 and is used to conduct and block the first high-pressure chamber 1011 and the first chamber 1012, the second cone valve core 322 is located in the second high-pressure chamber 1015 and is used to conduct and block the second high-pressure chamber 1015 and the second chamber 1014, the third cone valve core 332 is located in the third high-pressure chamber and is used to conduct and block the third high-pressure chamber and the first oil inlet and outlet 1116, the fourth cone valve core 332 is located in the fourth high-pressure chamber and is used to conduct and block the fourth high-pressure chamber and the second oil inlet and outlet 1117.

[0061] Specifically, if Figure 1 and Figure 2 As shown, the movement of the first valve core 21 can drive the first cone valve core 312 or the second cone valve core 322 to move, so that the first high-pressure chamber 1011 is connected to the first chamber 1012 or the second high-pressure chamber 1015 is connected to the second chamber 1014. Similarly, the movement of the second valve core 22 can drive the third cone valve core 332 or the fourth cone valve core 332 to move, so that the third chamber 1111 or the fourth chamber 1113 is connected to the second low-pressure chamber 1112.

[0062] It can be understood that when the first cone valve core 312 connects the first high-pressure chamber 1011 with the first chamber 1012, the second cone valve core 322 blocks the second high-pressure chamber 1015 from the second chamber 1014. Simultaneously, the third cone valve core 332 blocks the third chamber 1111 from the second low-pressure chamber 1112, and the fourth cone valve core 332 connects the fourth chamber 1113 from the second low-pressure chamber 1112. Conversely, when the second cone valve core 322 connects the second high-pressure chamber 1015 with the second chamber 1014, the first cone valve core 312 blocks the first high-pressure chamber 1011 from the first chamber 1012. Simultaneously, the third cone valve core 332 connects the third chamber 1111 from the second low-pressure chamber 1112, and the fourth cone valve core 332 blocks the fourth chamber 1113 from the second low-pressure chamber 1112. This achieves the conduction and switching function of the pilot-operated water-based digital valve according to the embodiment of the present invention.

[0063] That is to say, for example, when the first conical valve core 312 connects the first high-pressure chamber 1011 and the first chamber 1012, the high-pressure liquid can pass through the high-pressure oil port 1114, the first high-pressure chamber 1011 and the first chamber 1012 and be discharged from the first inlet and outlet oil ports 1116. At the same time, the low-pressure liquid can pass through the low-pressure oil port 1115, the second low-pressure chamber 1112 and the fourth chamber 1113 and be discharged from the second inlet and outlet oil ports 1117.

[0064] The first and second oil inlet and outlet ports 1116 and 1117 of the pilot-operated water-based digital valve of the present embodiment are connected to a hydraulic cylinder. When the first cone valve core 312 connects the first high-pressure chamber 1011 and the first chamber 1012, the liquid discharged from the first and second oil inlet and outlet ports 1116 and 1117 can drive the piston rod of the hydraulic cylinder to move in a first direction. Conversely, when the second cone valve core 322 connects the second high-pressure chamber 1015 and the second chamber 1014, the first oil inlet and outlet port 1116 discharges low-pressure liquid, while the second oil inlet and outlet port 1117 discharges high-pressure liquid. Consequently, the piston rod of the hydraulic cylinder moves in a second direction, thereby improving the precision and response speed of the pilot-operated water-based digital valve of the present embodiment. The first and second directions are opposite directions.

[0065] In other words, the pilot water-based digital valve of the embodiment of the present invention drives at least two of the first cone valve core 312 to the fourth cone valve core 332 to move through the movement of the first valve core 21 and the second valve core 22 (that is, the first cone valve core 312 and the fourth cone valve core 332 move simultaneously, and the second cone valve core 322 and the third cone valve core 332 move simultaneously), thereby realizing the conduction and switching function of the pilot water-based digital valve of the embodiment of the present invention. The first cone valve core 312 and the second cone valve core 322 can be driven by a motor, etc. to facilitate the control of the displacement of the first valve core 21 and the second valve core 22, thereby improving the linearity of the pilot water-based digital valve of the embodiment of the present invention. In addition, the first valve core 21 and the second valve core 22 are driven by a motor, which can also make the cone valve core have a relatively constant movement rate, thereby improving the stability of the use of the pilot water-based digital valve of the embodiment of the present invention.

[0066] In addition, for example, by using the first cone valve core 312 to block the first high-pressure chamber 1011 and the first chamber 1012 , the sealing between the first high-pressure chamber 1011 and the first chamber 1012 can be improved to prevent leakage of liquid with low viscosity.

[0067] Therefore, the pilot-operated water-based digital valve according to the embodiment of the present invention has the advantages of high linearity, high control accuracy, fast response speed, and low leakage.

[0068] In some embodiments, the pilot-operated water-based digital valve of an embodiment of the present invention has a first state and a second state. In the first state, the first conical valve core 312 connects the first high-pressure chamber 1011 and the first chamber 1012, and the high-pressure liquid in the first high-pressure chamber 1011 flows into the third chamber 1111 through the first chamber 1012, that is, the second valve core 22 moves along the left and right directions under the pressure of the liquid, and makes the fourth conical valve core 332 connect the fourth high-pressure chamber and the second oil inlet and outlet 1117, and the second low-pressure chamber 1112 is connected to the first oil inlet and outlet 1116.

[0069] It can be understood that in the first state, the first cone valve core 312 connects the first high-pressure chamber 1011 and the first chamber 1012, the second cone valve core 322 blocks the second high-pressure chamber 1015 and the second chamber 1014, the third cone valve core 332 blocks the third chamber 1111 and the second low-pressure chamber 1112, and the fourth cone valve core 332 connects the second low-pressure chamber 1112 and the fourth chamber 1113.

[0070] In the second state, the second cone valve core 322 connects the second chamber 1014 and the second high-pressure chamber 1015, and the liquid in the second high-pressure chamber 1015 flows into the fourth chamber 1113 through the second chamber 1014, that is, the second valve core 22 moves along the left and right directions under the pressure of the liquid, and makes the third cone valve core 332 connect the third high-pressure chamber and the first oil inlet and outlet 1116, and the second low-pressure chamber 1112 is connected to the second oil inlet and outlet 1117.

[0071] It can be understood that in the second state, the first cone valve core 312 blocks the first high-pressure chamber 1011 and the first chamber 1012, the second cone valve core 322 connects the second high-pressure gun high-pressure chamber and the second chamber 1014, the third cone valve core 332 connects the third chamber 1111 and the second low-pressure chamber 1112, and the fourth cone valve core 332 blocks the second low-pressure chamber 1112 and the fourth chamber 1113.

[0072] It should be noted that the pressure of the high-pressure liquid is greater than 16 MPa, and the pressure of the low-pressure liquid is less than 8 MPa.

[0073] In some embodiments, the pilot-operated water-based digital valve of the embodiment of the present invention further includes a first valve seat 31 to a fourth valve seat 34, each of which has a cavity. The first valve seat 31 is located in the first high-pressure cavity 1011, and the cavity of the first valve seat 31 is connected to the first high-pressure cavity 1011. The first cone valve core 312 is provided in the cavity of the first valve seat 31 and is used to conduct and block the cavity of the first valve seat 31 and the first cavity 1012. Specifically, as Figure 1 and Figure 2 As shown, the first valve seat 31 is located in the first high-pressure chamber 1011 and the first cone valve core 312 is located in the first valve seat 31, and the left end of the first valve core 21 passes through the first valve seat 31 and the first cone valve core 312 from right to left, thereby facilitating the installation of the first cone valve core 312.

[0074] The second valve seat 32 is located in the second high-pressure chamber 1015, and the cavity of the second valve seat 32 is connected to the second high-pressure chamber 1015. The second cone valve core 322 is provided in the cavity of the second valve seat 32 and is used to conduct and block the cavity of the second valve seat 32 and the second chamber 1014. Specifically, Figure 1 and Figure 2As shown, the second valve seat 32 is located in the second high-pressure chamber 1015 and the second cone valve core 322 is located in the second valve seat 32, and the left end of the first valve core 21 passes through the second valve seat 32 and the second cone valve core 322 from right to left, thereby facilitating the installation of the second cone valve core 322.

[0075] The third valve seat 33 is located in the third high-pressure chamber, and the cavity of the third valve seat 33 is connected to the third high-pressure chamber. The third cone valve core 332 is provided in the cavity of the third valve seat 33 and is used to conduct and block the cavity of the third valve seat 33 and the first oil inlet and outlet 1116. Specifically, Figure 1 and Figure 2 As shown, the third valve seat 33 is located in the third cavity 1111 and the third cone valve core 332 is located in the third valve seat 33, and the left end of the second valve core 22 passes through the third valve seat 33 and the third cone valve core 332 from right to left, thereby facilitating the installation of the third cone valve core 332.

[0076] The fourth valve seat 34 is located in the fourth high-pressure chamber, and the cavity of the fourth valve seat 34 is connected to the fourth high-pressure chamber. The fourth cone valve core 332 is provided in the cavity of the fourth valve seat 34 and is used to conduct and block the cavity of the fourth valve seat 34 and the second oil inlet and outlet 1117. Specifically, Figure 1 and Figure 2 As shown, the fourth valve seat 34 is located in the fourth cavity 1113 and the fourth cone valve core 332 is located in the fourth valve seat 34, and the left end of the second valve core 22 passes through the fourth valve seat 34 and the fourth cone valve core 332 from right to left, thereby facilitating the installation of the fourth cone valve core 332.

[0077] In some embodiments, the pilot-operated water-based digital valve of the embodiment of the present invention further includes a first elastic member 311, a second elastic member 321, a third elastic member 331 and a fourth elastic member 341. The first valve seat 31 further includes a first opening, which is provided on a side of the first valve seat 31 adjacent to the first cavity 1012. The first opening connects the cavity of the first valve seat 31 and the first cavity 1012. The first elastic member 311 is connected between the bottom wall of the cavity of the first valve seat 31 and the first cone valve core 312, so that the first cone valve core 312 blocks the first opening. Specifically, as Figure 1 and Figure 2 As shown, the first opening is opened on the right side of the first valve seat 31, the left end of the first elastic member 311 is connected to the bottom wall of the cavity of the first valve seat 31, and the right end of the first elastic member 311 is connected to the first cone valve core 312, so that when the pilot water-based digital valve of the embodiment of the present invention is in the initial state, the first cone valve core 312 blocks the first opening under the action of the elastic force of the first elastic member 311.

[0078] The second valve seat 32 further includes a second opening, which is provided on a side of the second valve seat 32 adjacent to the second cavity 1014. The second opening communicates with the cavity of the second valve seat 32 and the second cavity 1014. The second elastic member 321 is connected between the bottom wall of the cavity of the second valve seat 32 and the second cone valve core 322, so that the second cone valve core 322 blocks the second opening. Specifically, Figure 1 and Figure 2 As shown, the second opening is opened on the left side of the second valve seat 32, the right end of the second elastic member 321 is connected to the bottom wall of the cavity of the second valve seat 32, and the left end of the second elastic member 321 is connected to the second cone valve core 322, so that when the pilot water-based digital valve of the embodiment of the present invention is in the initial state, the second cone valve core 322 blocks the second opening under the action of the elastic force of the second elastic member 321.

[0079] The third valve seat 33 further includes a third opening, which is provided on a side of the third valve seat 33 adjacent to the first oil inlet and outlet 1116. The third opening connects the cavity of the third valve seat 33 and the first oil inlet and outlet 1116. The third elastic member 331 is connected between the bottom wall of the cavity of the third valve seat 33 and the third cone valve core 332, so that the third cone valve core 332 blocks the third opening. Specifically, Figure 1 and Figure 2 As shown, the third opening is opened on the right side of the third valve seat 33, the left end of the third elastic member 331 is connected to the bottom wall of the cavity of the third valve seat 33, and the right end of the third elastic member 331 is connected to the third cone valve core 332, so that when the pilot water-based digital valve of the embodiment of the present invention is in the initial state, the third cone valve core 332 blocks the third opening under the action of the elastic force of the third elastic member 331.

[0080] The fourth valve seat 34 further includes a fourth opening, which is provided on a side of the fourth valve seat 34 adjacent to the second oil inlet and outlet 1117. The fourth opening communicates with the cavity of the fourth valve seat 34 and the second oil inlet and outlet 1117. The fourth elastic member 341 is connected between the bottom wall of the cavity of the fourth valve seat 34 and the fourth cone valve core 332, so that the fourth cone valve core 332 blocks the fourth opening. Specifically, Figure 1 and Figure 2 As shown, the fourth opening is opened on the left side of the fourth valve seat 34, the right end of the fourth elastic member 341 is connected to the bottom wall of the cavity of the fourth valve seat 34, and the left end of the fourth elastic member 341 is connected to the fourth cone valve core 332, so that when the pilot water-based digital valve of the embodiment of the present invention is in the initial state, the fourth cone valve core 332 blocks the fourth opening under the action of the elastic force of the fourth elastic member 341.

[0081] It is understandable that if Figure 1 and Figure 2As shown, the first elastic member 311, the second elastic member 321, the third elastic member 331 and the fourth elastic member 341 are springs. Taking the first cone valve core 312 as an example, in the initial state, the first cone valve core 312 can block the first opening under the elastic force of the first elastic member 311 from left to right to block the cavity of the first valve seat 31 and the first cavity 1012. Similarly, the second cone valve core 322, the third cone valve core 332 and the fourth cone valve core 332 all block the second opening, the third opening and the fourth opening under the elastic force of the elastic member.

[0082] It should be noted that the first elastic member 311, the second elastic member 321, the third elastic member 331 and the fourth elastic member 341 can also be other structures with elastic properties, such as spring pieces, etc. That is to say, when the pilot water-based digital valve of the embodiment of the present invention is in the initial state, the first cone valve core 312, the second cone valve core 322, the third cone valve core 332 and the fourth cone valve core 332 are respectively blocked by the elastic force of the first elastic member 311, the second elastic member 321, the third elastic member 331 and the fourth elastic member 341.

[0083] In some embodiments, the first conical valve core 312 has a first circumferential wall surface 3121 and a first side surface 3122 and a second side surface 3123 axially opposite to each other along the first valve core 21. The first circumferential wall surface 3121 contacts the circumferential wall surface of the cavity of the first valve seat 31. The first conical valve core 312 also includes at least one first connecting hole 3124, which passes through the first side surface 3122 and the second side surface 3123.

[0084] Specifically, if Figure 1 and Figure 2 As shown, the left side of the first cone valve core 312 is a first side surface 3122, the right side of the first cone valve core 312 is a second side surface 3123, and the axial direction of the first communication hole 3124 is aligned with the left-right direction. The first circumferential wall surface 3121 is in sliding contact with the circumferential wall surface of the cavity of the first valve seat 31. That is, the first cone valve core 312 is movable relative to the first valve seat 31, and during this movement, the first circumferential wall surface 3121 contacts the circumferential wall surface of the cavity of the first valve seat 31 to prevent high-pressure liquid from leaking between the first circumferential wall surface 3121 and the circumferential wall surface of the cavity of the first valve seat 31.

[0085] It is understood that when the first cone valve core 312 connects the cavity of the first valve seat 31 and the first chamber 1012, high-pressure liquid can flow into the first chamber 1012 through the first high-pressure chamber 1011, the cavity of the first valve seat 31, and the first communication hole 3124, so that the high-pressure liquid can be discharged through the first oil inlet and outlet ports 1116. Preferably, a plurality of first communication holes 3124 are arranged at intervals along the circumference of the first cone valve core 312 to increase the flow rate of the high-pressure liquid.

[0086] The second conical valve core 322 has a second circumferential wall surface 3221 and a third side surface 3222 and a fourth side surface 3223 axially opposite to the first valve core 21. The second circumferential wall surface 3221 contacts the circumferential wall surface of the cavity of the second valve seat 32. The second conical valve core 322 also includes at least one second connecting hole 3224, and the second connecting hole 3224 passes through the third side surface 3222 and the fourth side surface 3223.

[0087] Specifically, if Figure 1 and Figure 2 As shown, the left side of the second cone valve core 322 is the third side surface 3222, the right side of the second cone valve core 322 is the fourth side surface 3223, and the axial direction of the second communication hole 3224 is aligned with the left-right direction. The second circumferential wall surface 3221 is in sliding contact with the circumferential wall surface of the cavity of the second valve seat 32. That is, the second cone valve core 322 is movable relative to the second valve seat 32, and during this movement, the second circumferential wall surface 3221 contacts the circumferential wall surface of the cavity of the second valve seat 32 to prevent high-pressure liquid from leaking between the second circumferential wall surface 3221 and the circumferential wall surface of the cavity of the second valve seat 32.

[0088] It is understood that when the second cone valve core 322 communicates with the cavity of the second valve seat 32 and the second chamber 1014, high-pressure liquid can flow into the second chamber 1014 through the second high-pressure chamber 1015, the cavity of the second valve seat 32, and the second communication hole 3224, so that the high-pressure liquid can be discharged through the second oil inlet and outlet port 1117. Preferably, a plurality of second communication holes 3224 are arranged at intervals along the circumference of the second cone valve core 322 to increase the flow rate of the high-pressure liquid.

[0089] The third conical valve core 332 has a third circumferential wall surface 3321 and a fifth side surface 3322 and a sixth side surface 3323 axially opposite to each other along the second valve core 22. The third circumferential wall surface 3321 contacts the circumferential wall surface of the cavity of the third valve seat 33. The third conical valve core 332 also includes at least one third connecting hole 3324. The third connecting hole 3324 passes through the fifth side surface 3322 and the sixth side surface 3323.

[0090] Specifically, if Figure 1 and Figure 2 As shown, the left side of the third cone valve core 332 is the fifth side surface 3322, the right side of the third cone valve core 332 is the sixth side surface 3323, and the axial direction of the third communication hole 3324 is aligned with the left-right direction. The third circumferential wall surface 3321 is in sliding contact with the circumferential wall surface of the cavity of the third valve seat 33. That is, the third cone valve core 332 is movable relative to the third valve seat 33, and during this movement, the third circumferential wall surface 3321 contacts the circumferential wall surface of the cavity of the third valve seat 33 to prevent low-pressure liquid from leaking between the third circumferential wall surface 3321 and the circumferential wall surface of the cavity of the third valve seat 33.

[0091] It is understood that when the third cone valve core 332 communicates with the cavity of the third valve seat 33 and the second low-pressure chamber 1112, low-pressure liquid can flow into the first chamber 1012 through the cavity of the third valve seat 33 and the third chamber 1111, so that the low-pressure liquid can be discharged through the first oil inlet and outlet ports 1116. Preferably, the plurality of third communication holes 3324 are arranged at intervals along the circumference of the third cone valve core 332 to increase the flow rate of the low-pressure liquid.

[0092] The fourth conical valve core 332 has a fourth circumferential wall surface 3421 and a seventh side surface 3422 and an eighth side surface 3423 axially opposite to each other along the second valve core 22. The fourth circumferential wall surface 3421 contacts the circumferential wall surface of the cavity of the fourth valve seat 34. The fourth conical valve core 332 also includes at least one fourth connecting hole 3324. The fourth connecting hole 3324 passes through the seventh side surface 3422 and the eighth side surface 3423.

[0093] Specifically, if Figure 1 and Figure 2 As shown, the left side of the fourth cone valve core 332 is the seventh side surface 3422, the right side of the fourth cone valve core 332 is the eighth side surface 3423, and the axial direction of the fourth communication hole 3324 is aligned with the left-right direction. The fourth peripheral wall surface 3421 is in sliding contact with the peripheral wall surface of the cavity of the fourth valve seat 34. That is, the fourth cone valve core 332 is movable relative to the fourth valve seat 34, and during this movement, the fourth peripheral wall surface 3421 contacts the peripheral wall surface of the cavity of the fourth valve seat 34 to prevent low-pressure liquid from leaking between the fourth peripheral wall surface 3421 and the peripheral wall surface of the cavity of the fourth valve seat 34.

[0094] It is understood that when the fourth cone valve core 332 communicates with the cavity of the fourth valve seat 34 and the second low-pressure chamber 1112, low-pressure liquid can flow into the second chamber 1014 through the cavity of the fourth valve seat 34 and the fourth chamber 1113, so that the low-pressure liquid can be discharged through the second oil inlet and outlet ports 1117. Preferably, the plurality of fourth communication holes 3324 are arranged at intervals along the circumference of the fourth cone valve core 332 to increase the flow rate of the low-pressure liquid.

[0095] In some embodiments, the first valve core 21 also includes a first protrusion 211 and a second protrusion 212, the first protrusion 211 is located in the first cavity 1012 and is adjacent to the first conical valve core 312, the second protrusion 212 is located in the second cavity 1014 and is adjacent to the second conical valve core 322, the second valve core 22 includes a third protrusion 221 and a fourth protrusion 222, the third protrusion 221 and the fourth protrusion 222 are located between the third conical valve core 332 and the fourth conical valve core 332 on the axis of the second valve core 22, the third protrusion 221 is adjacent to the third conical valve core 332, and the fourth protrusion 222 is adjacent to the fourth conical valve core 332.

[0096] In the first state, the first protrusion 211 abuts the first cone valve core 312, allowing communication between the first cone valve core 312 and the cavity of the first valve seat 31 and the first chamber 1012. The fourth protrusion 222 abuts the fourth cone valve core 332, allowing communication between the fourth high-pressure chamber and the second oil inlet and outlet 1117. It is understood that when the first valve core 21 moves from right to left, the first protrusion 211 abuts the second side surface 3123 of the first cone valve core 312, pushing the first cone valve core 312 to overcome the elastic force of the first elastic member 311 and move from right to left, thereby allowing communication between the first cone valve core 312 and the cavity of the first valve seat 31 and the first chamber 1012. Similarly, when the first valve core 21 moves from right to left and the second valve core 22 moves from left to right, the third protrusion 221 pushes the fourth cone valve core 332 so that the fourth cone valve core 332 overcomes the elastic force of the fourth elastic member 341 and moves from left to right, thereby connecting the second low-pressure chamber 1112 and the fourth chamber 1113.

[0097] In the second state, the second protrusion 212 abuts against the second cone valve core 322, allowing communication between the second cone valve core 322 and the second chamber 1014 of the second valve seat 32. The third protrusion 221 abuts against the third cone valve core 332, allowing communication between the third high-pressure chamber and the first oil inlet and outlet ports 1116. It is understood that when the first valve core 21 moves from left to right, the second protrusion 212 abuts against the third side surface 3222 of the second cone valve core 322, pushing the second cone valve core 322 to overcome the elastic force of the second elastic member 321 and move from left to right, thereby allowing communication between the second cone valve core 322 and the cavity of the second valve seat 32 and the second chamber 1014. Similarly, when the second valve core 22 moves from left to right and the third valve core moves from right to left, the third protrusion 221 pushes the third cone valve core 332 so that the third cone valve core 332 overcomes the elastic force of the third elastic member 331 and moves from right to left, thereby connecting the second low-pressure chamber 1112 and the third chamber 1111.

[0098] In some embodiments, the pilot-operated water-based digital valve of an embodiment of the present invention also includes a first guide member 41 and a second guide member 42. The first guide member 41 is arranged in the first valve cavity 101, and the first valve core 21 is provided with a first guide portion 213 matching the first guide member 41. The second guide member 42 is arranged in the second valve cavity 111, and the second valve core 22 is provided with a second guide portion 223 matching the second guide member 42.

[0099] Specifically, if Figure 1 and Figure 2As shown, the first guide member 41 is disposed adjacent to the left end of the first valve core 21. The outer circumference of the first guide member 41 contacts the inner circumference of the first guide portion 213 to reduce vibrations generated when the first valve core 21 moves and improve the stability of the first valve core 21. Similarly, the outer circumference of the second guide member 42 contacts the inner circumference of the second guide portion 223. Specifically, as shown in FIG. Figure 1 As shown, the left end of the second valve core 22 forms a second guide member 42 .

[0100] It is understood that there may be multiple first guide members 41 and multiple first guide portions 213, with each first guide member 41 corresponding to each first guide portion 213. For example, there may be two first guide members 41, one adjacent to the left and right ends of the first valve core 21. Preferably, the multiple first guide members 41 are spaced apart along the axial direction of the first valve core 21, thereby further improving the stability of the first valve core 21. Similarly, there may be multiple second guide members 42 and multiple second guide portions 223, with each second guide member 42 corresponding to each second guide portion 223.

[0101] In some embodiments, the pilot water-based digital valve of an embodiment of the present invention also includes a first connecting member 51 and a second connecting member 52. The first connecting member 51 includes a first connecting portion 511 and a first matching portion 512. The second connecting member 52 includes a second connecting portion 521 and a second matching portion 522. The first connecting portion 511 is connected to the second end of the first valve core 21, the second connecting portion 521 is connected to the second end of the second valve core 22, and the first matching portion 512 is connected to the second matching portion 522, so that the second connecting member 52 rotates and drives the first connecting member 51 to rotate.

[0102] It is understandable that if Figure 1 and Figure 2 As shown, the first connecting portion 511 can be connected to the second end of the first valve core 21 via threads, that is, one of the first connecting portion 511 and the first valve core 21 is provided with internal threads, and the other of the first connecting portion 511 and the first valve core 21 is provided with external threads. The second connecting portion 521 is connected to the second end of the second valve core 22 via a nut-screw pair. The first mating portion 512 and the second mating portion 522 can be a mutually meshing gear set, and the gears of the gear set have the same specifications.

[0103] That is, when the first valve core 21 is rotated, since the first valve core 21 is threadedly connected to the first connecting portion 511, the first valve core 21 simultaneously moves in the left and right directions. For example, the first valve core 21 moves from the initial position in the direction from right to left, and the hydraulic pressure difference is used to drive the second valve core 22 to move. Since the second valve core 22 is connected to the second connecting portion 521 via a nut-screw pair, it can drive the second connecting portion 521 to rotate, and drive the second matching portion 522 and the second matching portion 522 to rotate. Then, by utilizing the threaded engagement of the first connecting portion 511 and the first valve core 21, the first valve core 21 moves in the direction from left to right and gradually moves to the initial position. This allows the first valve core 21 to quickly respond to the next movement instruction, thereby improving the response speed of the pilot-operated water-based digital valve of the embodiment of the present invention.

[0104] In some embodiments, the pilot-operated water-based digital valve of the embodiment of the present invention further includes a driving member 6 , which includes a driving portion 61 . The driving portion 61 is connected to the first valve core 21 to drive the first valve core 21 to rotate.

[0105] Specifically, if Figure 1 and Figure 2 As shown, the driving member 6 can be a motor, and the driving part 61 is the output shaft of the motor. Then the driving part 61 can be connected to the first valve core 21 through a coupling, and the coupling and the first valve core 21 are connected through a spline, so that the driving member 6 is started to drive the first valve core 21 to rotate.

[0106] It is understood that the number of rotations of the driver 6 can be converted into the displacement of the first valve core 21 through the threaded connection between the first valve core 21 and the first connecting portion 511. That is, the displacement corresponding to one rotation of the first valve core 21 is equal to the thread pitch (the pitch of the thread provided on the outer circumference of the first valve core 21 or the inner circumference of the first connecting portion 511). In other words, after the first valve core 21 moves a first distance from left to right, the hydraulic pressure differential is used to drive the second valve core 22 to move. The movement of the second valve core 22 drives the second connecting member 52 and the first connecting member 51 to rotate. The relative rotation of the first connecting member 51 and the first valve core 21 is converted into movement of the first valve core 21 from right to left through the threaded connection, and the movement distance is the same as the first distance.

[0107] In other words, the pilot-operated water-based digital valve of an embodiment of the present invention utilizes a motor to convert the rotation of the first valve core 21 into the movement of the second valve core 22, and restores the first valve core 21 to its initial position through the first connecting member 51 and the second connecting member 52, so that the first valve core 21 can respond in time in subsequent use.

[0108] The hydraulic system of an embodiment of the present invention includes a pilot water-based digital valve and a hydraulic cylinder. The pilot water-based digital valve is a pilot water-based digital valve according to any of the above embodiments. The pilot water-based digital valve is connected to the hydraulic cylinder to drive the piston rod of the hydraulic cylinder to move.

[0109] It can be understood that since the hydraulic system of the embodiment of the present invention includes the pilot water-based digital valve of the above embodiment, and the pilot water-based digital valve is driven by a servo motor and has a high opening and closing accuracy, and the first valve core 21 can mechanically feedback the first connecting member 51 and the second connecting member 52 after moving, so that the pilot water-based digital valve responds faster. Therefore, by connecting the pilot water-based digital valve of the above embodiment to the hydraulic cylinder, the piston rod of the hydraulic cylinder can be made to have high telescopic accuracy and fast response speed.

[0110] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0111] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0112] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0113] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0114] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0115] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A pilot-operated water-based digital valve, characterized in that: include: A pilot valve having a first valve chamber, the first valve chamber including a first high-pressure chamber, a first chamber, a first low-pressure chamber, a second chamber, and a second high-pressure chamber arranged in sequence, the pilot valve including a first valve core, the first valve core being inserted into the pilot valve and movable along an axis of the first valve core; The main valve has a second valve chamber, the second valve chamber includes a third chamber, a third high-pressure chamber, a second low-pressure chamber, a fourth high-pressure chamber and a fourth chamber arranged in sequence, the main valve includes a second valve core, the second valve core is inserted into the main valve, and the second valve core is movable along the axis of the second valve core. The main valve further comprises a high-pressure oil port, a low-pressure oil port, a first oil inlet and outlet port, and a second oil inlet and outlet port. The first to fourth high-pressure chambers are all in communication with the high-pressure oil port, the first low-pressure chamber and the second low-pressure chamber are both in communication with the low-pressure oil port, the first chamber is in communication with the third chamber, and the second chamber is in communication with the fourth chamber. The first cone valve core to the fourth cone valve core, the first cone valve core and the second cone valve core are sleeved on the first valve core and are movable along the axis of the first valve core, the third cone valve core and the fourth cone valve core are sleeved on the second valve core and are movable along the axis of the second valve core, the first cone valve core is located in the first high-pressure chamber and is used to conduct and block the first high-pressure chamber and the first chamber, the second cone valve core is located in the second high-pressure chamber and is used to conduct and block the second high-pressure chamber and the second chamber, the third cone valve core is located in the third high-pressure chamber and is used to conduct and block the third high-pressure chamber and the first inlet and outlet oil ports, and the fourth cone valve core is located in the fourth high-pressure chamber and is used to conduct and block the fourth high-pressure chamber and the second inlet and outlet oil ports.

2. The pilot-operated water-based digital valve according to claim 1, characterized in that: The pilot-operated water-based digital valve has a first state and a second state. In the first state, the first cone valve core connects the first high-pressure chamber and the first chamber, and the liquid in the first high-pressure chamber flows into the third chamber through the first chamber. The first low-pressure chamber is connected to the second chamber, and the liquid in the first low-pressure chamber flows into the fourth chamber through the second chamber, so that the second valve core moves. The fourth cone valve core connects the fourth high-pressure chamber and the second oil inlet and outlet, and the second low-pressure chamber is connected to the first oil inlet and outlet. In the second state, the second cone valve core connects the second chamber and the second high-pressure chamber, the liquid in the second high-pressure chamber flows into the fourth chamber through the second chamber, the first low-pressure chamber is connected to the first chamber, and the liquid in the first low-pressure chamber flows into the third chamber through the first chamber, so that the second valve core moves, the third cone valve core connects the third high-pressure chamber and the first inlet and outlet oil ports, and the second low-pressure chamber is connected to the second inlet and outlet oil ports.

3. The pilot-operated water-based digital valve according to claim 2, characterized in that: The valve assembly further includes first to fourth valve seats, each of which has a cavity. The first valve seat is located in the first high-pressure cavity, and the cavity of the first valve seat is communicated with the first high-pressure cavity. The first cone valve core is disposed in the cavity of the first valve seat and is used to connect and block the cavity of the first valve seat and the first cavity. The second valve seat is located in the second high-pressure chamber, the cavity of the second valve seat is communicated with the second high-pressure chamber, and the second cone valve core is arranged in the cavity of the second valve seat and is used to connect and block the cavity of the second valve seat and the second chamber; The third valve seat is located in the third high-pressure chamber, and the cavity of the third valve seat is communicated with the third high-pressure chamber. The third cone valve core is arranged in the cavity of the third valve seat and is used to connect and block the cavity of the third valve seat and the first oil inlet and outlet. The fourth valve seat is located in the fourth high-pressure chamber, the cavity of the fourth valve seat is connected to the fourth high-pressure chamber, and the fourth cone valve core is arranged in the cavity of the fourth valve seat and is used to conduct and block the cavity of the fourth valve seat and the second oil inlet and outlet.

4. The pilot-operated water-based digital valve according to claim 3, characterized in that: The valve seat further comprises first to fourth elastic members, the first valve seat further comprising a first opening, the first opening being provided on a side of the first valve seat adjacent to the first cavity, the first opening communicating with the cavity of the first valve seat and the first cavity, the first elastic member being connected between a bottom wall of the cavity of the first valve seat and the first conical valve core, so that the first conical valve core blocks the first opening; The second valve seat further includes a second opening, which is provided on a side of the second valve seat adjacent to the second cavity. The second opening communicates between the cavity of the second valve seat and the second cavity. The second elastic member is connected between the bottom wall of the cavity of the second valve seat and the second cone valve core, so that the second cone valve core blocks the second opening. The third valve seat further includes a third opening, which is provided on a side of the third valve seat adjacent to the first oil inlet and outlet, the third opening communicating with the cavity of the third valve seat and the first oil inlet and outlet, and the third elastic member being connected between the bottom wall of the cavity of the third valve seat and the third cone valve core, so that the third cone valve core blocks the third opening; The fourth valve seat also includes a fourth opening, which is arranged on a side of the fourth valve seat adjacent to the second oil inlet and outlet. The fourth opening connects the cavity of the fourth valve seat and the second oil inlet and outlet. The fourth elastic member is connected between the bottom wall of the cavity of the fourth valve seat and the fourth cone valve core, so that the fourth cone valve core blocks the fourth opening.

5. The pilot-operated water-based digital valve according to claim 4, characterized in that: The first conical valve core has a first circumferential wall surface and a first side surface and a second side surface opposite to each other along the axial direction of the first valve core, the first circumferential wall surface contacts the circumferential wall surface of the cavity of the first valve seat, and the first conical valve core further includes at least one first communicating hole, the first communicating hole passing through the first side surface and the second side surface; The second conical valve core has a second circumferential wall surface and a third side surface and a fourth side surface opposite to each other along the axial direction of the first valve core, the second circumferential wall surface contacts the circumferential wall surface of the cavity of the second valve seat, and the second conical valve core further includes at least one second communicating hole, the second communicating hole passing through the third side surface and the fourth side surface; The third cone valve core has a third circumferential wall surface and a fifth side surface and a sixth side surface opposite to each other along the axial direction of the second valve core, the third circumferential wall surface contacts the circumferential wall surface of the cavity of the third valve seat, and the third cone valve core further includes at least one third communicating hole, the third communicating hole passing through the fifth side surface and the sixth side surface; The fourth conical valve core has a fourth circumferential wall surface and a seventh side surface and an eighth side surface opposite to each other along the axial direction of the second valve core. The fourth circumferential wall surface contacts the circumferential wall surface of the cavity of the fourth valve seat. The fourth conical valve core also includes at least one fourth communicating hole, and the fourth communicating hole passes through the seventh side surface and the eighth side surface.

6. The pilot-operated water-based digital valve according to claim 5, characterized in that: The first valve core further includes a first protrusion and a second protrusion, the first protrusion is located in the first cavity and is adjacent to the first cone valve core, the second protrusion is located in the second cavity and is adjacent to the second cone valve core, the second valve core includes a third protrusion and a fourth protrusion, the third protrusion and the fourth protrusion are located between the third cone valve core and the fourth cone valve core on the axis of the second valve core, the third protrusion is adjacent to the third cone valve core, and the fourth protrusion is adjacent to the fourth cone valve core. In the first state, the first protrusion abuts against the first cone valve core, so that the first cone valve core conducts communication between the cavity of the first valve seat and the first cavity, and the fourth protrusion abuts against the fourth cone valve core, so that the fourth cone valve core conducts communication between the fourth high-pressure cavity and the second oil inlet and outlet. In the second state, the second protrusion abuts against the second cone valve core, so that the second cone valve core connects the cavity of the second valve seat and the second cavity, and the third protrusion abuts against the third cone valve core, so that the third cone valve core connects the third high-pressure cavity and the first oil inlet and outlet.

7. The pilot-operated water-based digital valve according to claim 1, characterized in that: It also includes a first guide member and a second guide member, the first guide member is arranged in the first valve cavity, the first valve core is provided with a first guide portion matching the first guide member, the second guide member is arranged in the second valve cavity, and the second valve core is provided with a second guide portion matching the second guide member.

8. The pilot-operated water-based digital valve according to claim 1, characterized in that: The first connecting member includes a first connecting portion and a first matching portion, and the second connecting member includes a second connecting portion and a second matching portion. The first connecting portion is connected to the second end of the first valve core, the second connecting portion is connected to the second end of the second valve core, and the first matching portion is connected to the second matching portion, so that the second connecting member rotates and drives the first connecting member to rotate.

9. The pilot-operated water-based digital valve according to claim 8, characterized in that: It also includes a driving member, which includes a driving portion. The driving portion is connected to the first valve core to drive the first valve core to rotate.

10. A hydraulic system, characterized in that: It comprises a pilot water-based digital valve and a hydraulic cylinder, wherein the pilot water-based digital valve is the pilot water-based digital valve according to any one of claims 1 to 9, and the pilot water-based digital valve is connected to the hydraulic cylinder to drive the piston rod of the hydraulic cylinder to move.

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