A pilot operated internal feedback proportional spool valve and hydraulic system

Abstract

This invention discloses a pilot-operated internal feedback proportional cone valve and a hydraulic system. The pilot-operated internal feedback proportional cone valve includes a pilot valve, a main valve, and a mechanical feedback device. The pilot valve has a first valve chamber and includes a first valve stem movably disposed on the pilot valve along its axial direction. The main valve has a second valve chamber and a third valve chamber connected together, with the first valve chamber and the third valve chamber connected. The main valve also includes a second valve stem and a third valve stem. The second valve stem is movably disposed on the main valve along its axial direction, with a portion of the second valve stem located within the second valve chamber. The third valve stem is movably disposed on the main valve along its axial direction, with a portion of the third valve stem located within the third valve chamber. The first valve stem, the second valve stem, and the third valve stem are all drively connected to the mechanical feedback device. The pilot-operated internal feedback proportional cone valve of this invention has the advantages of high control accuracy.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a pilot-operated internal feedback proportional cone valve and a hydraulic system. Background Technology

[0002] Currently, most pilot-operated proportional valves on the market rely on proportional electromagnets to drive the valve core. In actual use, the magnetic attraction of the proportional electromagnet changes with the position of the valve core, which alters the force on the valve core, resulting in poor linearity of the pilot-operated proportional valve. In addition, the position of the valve core is mainly detected and fed back by sensors to control the energization of the proportional electromagnet and thus control the force on the valve core. This electro-hydraulic feedback method has a certain signal delay, which reduces the control accuracy of the proportional valve. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a pilot-operated internal feedback proportional cone valve with high control accuracy;

[0005] The embodiments of the present invention propose a hydraulic system with high control precision.

[0006] The pilot-operated internal feedback proportional cone valve of this invention includes a pilot valve, a main valve and a mechanical feedback device. The pilot valve has a first valve chamber and includes a first valve stem, which is movably disposed on the pilot valve along its axial direction.

[0007] The main valve has a connected second valve chamber and a third valve chamber, the first valve chamber is connected to the third valve chamber, the main valve also includes a second valve stem and a third valve stem, the second valve stem is movably disposed on the main valve along its axial direction and a part of the second valve stem is placed in the second valve chamber, the third valve stem is movably disposed on the main valve along its axial direction and a part of the third valve stem is placed in the third valve chamber, the main valve has an inlet, an outlet, a first working port and a second working port;

[0008] The first valve stem, the second valve stem, and the third valve stem are all connected to the mechanical feedback device via transmission.

[0009] Specifically, when the first valve stem moves along its axial direction, the pilot valve drives the third valve stem to move along its axial direction so that the inlet port is connected to one of the first working port and the second working port. When the third valve stem moves along its axial direction, the mechanical feedback device can drive the first valve stem and the second valve stem to move along their own axial direction so that the first valve stem is reset and the return port is connected to the other of the first working port and the second working port.

[0010] In some embodiments, the pilot-operated internal feedback proportional cone valve of the present invention further includes a first transmission member, a second transmission member, and a third transmission member;

[0011] The first transmission component has a first connecting part and a first mating part. The first connecting part is connected to the first valve stem. The rotation of the first mating part can drive the first valve stem to move along its axial direction.

[0012] The second transmission component has a second connecting portion and a second mating portion. The second connecting portion is connected to the second valve stem, and the second mating portion is mated with the first mating portion. Rotation of the second mating portion can drive the second valve stem to move axially and drive the first mating portion to rotate.

[0013] The third transmission component has a third connecting part and a third mating part. The third connecting part is connected to the third valve stem, and the third mating part is mated and connected to the second mating part. The movement of the third valve stem along its axial direction can drive the third mating part to rotate, and the rotation of the third mating part can drive the second mating part to rotate.

[0014] In some embodiments, the first mating part, the second mating part, and the third mating part are all gears, and the first mating part and the third mating part are all meshed with the second mating part; or the first mating part, the second mating part, and the third mating part are all sprockets, and the first mating part and the third mating part are all connected to the second mating part by a chain.

[0015] In some embodiments, the first valve stem is threadedly connected to the first connecting portion, the second valve stem is threadedly connected to the second connecting portion, and the third valve stem is threadedly connected to the third connecting portion via a ball screw pair.

[0016] In some embodiments, the pilot-operated internal feedback proportional cone valve of the present invention further includes a drive transposer. The drive device includes a drive member and a connector. The output portion of the drive member is connected to one end of the connector, and the other end of the connector is connected to the first valve stem via a spline. The drive member is used to drive the first valve stem to move along its axial direction.

[0017] In some embodiments, the first valve chamber includes a first high-pressure chamber, a first chamber, a first low-pressure chamber, a second chamber, and a second high-pressure chamber arranged sequentially; the second valve chamber has a third chamber, a second low-pressure chamber, and a fourth chamber arranged sequentially; the third valve chamber has a first control chamber, a third high-pressure chamber, a fifth chamber, a third low-pressure chamber, a sixth chamber, a fourth high-pressure chamber, and a second control chamber arranged sequentially; the first chamber is connected to the first control chamber; the second chamber is connected to the second control chamber; the first high-pressure chamber to the fourth high-pressure chamber are all connected to the inlet; the first low-pressure chamber to the third low-pressure chamber are all connected to the return port; the third chamber and the fifth chamber are both connected to the first working port; and the fourth chamber and the sixth chamber are both connected to the second working port.

[0018] The pilot-operated internal feedback proportional cone valve has a first state and a second state. In the first state, the second high-pressure chamber is connected to the second chamber, and the liquid in the second high-pressure chamber flows into the second control chamber through the second chamber to move the third valve stem. The first chamber is connected to the first low-pressure chamber, so that the liquid in the first control chamber flows into the first low-pressure chamber through the first chamber. The third high-pressure chamber is connected to the fifth chamber, and the liquid in the third high-pressure chamber flows into the fifth chamber and flows out through the first working port. The fourth chamber is connected to the second low-pressure chamber, and the liquid flowing into the second working port flows into the second low-pressure chamber through the fourth chamber and flows out through the return port.

[0019] In the second state, the first high-pressure chamber is connected to the first cavity, and the liquid in the first high-pressure chamber flows into the first control chamber through the first cavity to move the third valve stem. The second cavity is connected to the first low-pressure chamber, so that the liquid in the second control chamber flows into the first low-pressure chamber through the second cavity. The fourth high-pressure chamber is connected to the sixth cavity, and the liquid in the fourth high-pressure chamber flows into the sixth cavity and flows out through the second working port. The third cavity is connected to the second low-pressure chamber, and the liquid flowing in through the first working port flows into the second low-pressure chamber through the third cavity and flows out through the return port.

[0020] In some embodiments, the pilot-operated internal feedback proportional cone valve of the present invention further includes a first cone valve core to a sixth cone valve core. The first and second cone valve cores are sleeved on the first valve stem and are movable along the axial direction of the first valve stem. The third and fourth cone valve cores are sleeved on the second valve stem and are movable along the axial direction of the second valve stem. The fifth and sixth cone valve cores are sleeved on the third valve stem and are movable along the axial direction of the third valve stem. The first cone valve core is located within the first high-pressure chamber and is used to connect and disconnect the first high-pressure chamber and the... The first chamber, the second cone valve core located in the second high-pressure chamber and used to open and close the second high-pressure chamber and the second chamber, the third cone valve core located in the third chamber and used to open and close the third chamber and the second low-pressure chamber, the fourth cone valve core located in the fourth chamber and used to open and close the fourth chamber and the second low-pressure chamber, the fifth cone valve core located in the third high-pressure chamber and used to open and close the third high-pressure chamber and the fifth chamber, and the sixth cone valve core located in the fourth high-pressure chamber and used to open and close the fourth high-pressure chamber and the sixth chamber.

[0021] In some embodiments, the pilot-operated internal feedback proportional cone valve of the present invention further includes a first reset member to a sixth reset member. The first reset member is located in the first high-pressure chamber, and its two ends abut against the bottom wall of the first high-pressure chamber and the first cone valve core, respectively. The second reset member is located in the second high-pressure chamber, and its two ends abut against the bottom wall of the second high-pressure chamber and the first cone valve core, respectively. The third reset member is located in the third chamber, and its two ends abut against the bottom wall of the third chamber and the third cone valve core, respectively. The fourth reset member is located in the fourth chamber, and its two ends abut against the bottom wall of the fourth chamber and the fourth cone valve core, respectively. The fifth reset member is located in the third high-pressure chamber, and its two ends abut against the bottom wall of the third high-pressure chamber and the fifth cone valve core, respectively. The sixth reset member is located in the fourth high-pressure chamber, and its two ends abut against the bottom wall of the fourth high-pressure chamber and the sixth cone valve core, respectively.

[0022] In some embodiments, the first valve stem further includes a first protrusion and a second protrusion located within the first valve cavity, the first protrusion being disposed adjacent to the first cone valve core and the second protrusion being disposed adjacent to the second cone valve core; the second valve stem further includes a third protrusion and a fourth protrusion located within the second valve cavity, the third protrusion being disposed adjacent to the third cone valve core and the fourth protrusion being disposed adjacent to the fourth cone valve core; the third valve stem further includes a fifth protrusion and a sixth protrusion located within the third valve cavity, the fifth protrusion being disposed adjacent to the fifth cone valve core and the sixth protrusion being disposed adjacent to the sixth cone valve core.

[0023] In the first state, the second protrusion abuts against the second cone valve core, so that the second cone valve core connects the second high-pressure chamber and the second chamber; the fourth protrusion abuts against the fourth cone valve core, so that the fourth cone valve core connects the fourth chamber and the second low-pressure chamber; and the fifth protrusion abuts against the fifth cone valve core, so that the fifth cone valve core connects the third high-pressure chamber and the fifth chamber.

[0024] In the second state, the first protrusion abuts against the first cone valve core, so that the first cone valve core connects the first high-pressure chamber and the first chamber; the third protrusion abuts against the third cone valve core, so that the third cone valve core connects the third chamber and the second low-pressure chamber; and the sixth protrusion abuts against the sixth cone valve core, so that the sixth cone valve core connects the fourth high-pressure chamber and the sixth chamber.

[0025] The hydraulic system described in this embodiment of the invention includes a pilot-operated internal feedback proportional cone valve and a hydraulic cylinder. The pilot-operated internal feedback proportional cone valve is the pilot-operated internal feedback proportional cone valve described in any of the above embodiments. The pilot-operated internal feedback proportional cone valve is connected to the hydraulic cylinder to drive the piston rod of the hydraulic cylinder to move.

[0026] The pilot-operated internal feedback proportional cone valve of this invention incorporates a mechanical feedback device. The first, second, and third valve stems are all connected to this mechanical feedback device, enabling the first and second valve stems to react quickly when the pilot valve drives the third valve stem to move. This improves the response speed and linearity of the pilot-operated internal feedback proportional cone valve of this invention. Compared to proportional valves in related technologies that use sensor feedback, this invention improves the control accuracy of the pilot-operated internal feedback proportional cone valve.

[0027] Therefore, the pilot-operated internal feedback proportional cone valve of the present invention has the advantages of high control accuracy.

[0028] Therefore, the hydraulic system with the pilot-operated internal feedback proportional cone valve of the present invention also has the advantages of high control accuracy. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the pilot-operated internal feedback proportional cone valve according to an embodiment of the present invention.

[0030] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0031] Figure 3 This is a schematic diagram of the pilot-operated internal feedback proportional cone valve in the first state according to an embodiment of the present invention.

[0032] Figure 4 yes Figure 3 Enlarged view of section B.

[0033] Figure label:

[0034] 100-type pilot-operated internal feedback proportional cone valve;

[0035] Pilot valve 1; 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; First valve stem 102; First protrusion 1021; Second protrusion 1022;

[0036] Main valve 2; Second valve chamber 201; Third chamber 2011; Second low-pressure chamber 2012; Fourth chamber 2013; Third valve chamber 202; First control chamber 2021; Third high-pressure chamber 2022; Fifth chamber 2023; Third low-pressure chamber 2024; Sixth chamber 2025; Fourth high-pressure chamber 2026; Second control chamber 2027; Second valve stem 203; Third protrusion 2031; Fourth protrusion 2032; Third valve stem 204; Fifth protrusion 2041; Sixth protrusion 2042; Liquid inlet 205; Liquid return port 206; First working port 207; Second working port 208;

[0037] First transmission component 3; First connecting part 301; First mating part 302;

[0038] Second transmission component 4; second connecting part 401; second mating part 402;

[0039] Third transmission component 5; Third connecting part 501; Third mating part 502;

[0040] Drive component 6;

[0041] Connector 7;

[0042] First cone valve core 801; Second cone valve core 802; Third cone valve core 803; Fourth cone valve core 804; Fifth cone valve core 805; Sixth cone valve core 806;

[0043] First reset component 901; second reset component 902; third reset component 903; fourth reset component 904; fifth reset component 905; sixth reset component 906. Detailed Implementation

[0044] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0045] The technical solution of this application will now be described in detail with reference to the accompanying drawings.

[0046] like Figures 1 to 4 As shown, the pilot-operated internal feedback proportional cone valve 100 of this embodiment includes a pilot valve 1, a main valve 2, and a mechanical feedback device.

[0047] The pilot valve 1 has a first valve chamber 101 and includes a first valve stem 102, which is movably disposed on the pilot valve 1 along its axial direction.

[0048] Specifically, such as Figures 1 to 4 As shown, the first valve stem 102 passes through the pilot valve 1 in the left-right direction and is movable in the left-right direction. A part of the first valve stem 102 is placed in the first valve chamber 101, and the right end of the first valve stem 102 is connected to the mechanical feedback device for transmission.

[0049] The main valve 2 has a connected second valve chamber 201 and a third valve chamber 202. The first valve chamber 101 is connected to the third valve chamber 202. The main valve 2 also includes a second valve stem 203 and a third valve stem 204. The second valve stem 203 is movably disposed on the main valve 2 along its axial direction and a part of the second valve stem 203 is placed in the second valve chamber 201. The third valve stem 204 is movably disposed on the main valve 2 along its axial direction and a part of the third valve stem 204 is placed in the third valve chamber 202. The main valve 2 has an inlet 205, a return port 206, a first working port 207, and a second working port 208.

[0050] Specifically, such as Figures 1 to 4 As shown, the first valve chamber 101, the second valve chamber 201, and the third valve chamber 202 are arranged sequentially from top to bottom. The second valve stem 203 is movably mounted on the main valve 2 in the left-right direction. The right end of the second valve stem 203 is connected to the mechanical feedback device. The third valve stem 204 is movably mounted on the main valve 2 in the left-right direction. The right end of the third valve stem 204 is connected to the mechanical feedback device.

[0051] When the first valve stem 102 moves along its axial direction, the pilot valve 1 drives the third valve stem 204 to move along its axial direction, so that the inlet port 205 is connected to one of the first working port 207 and the second working port 208. When the third valve stem 204 moves along its axial direction, the mechanical feedback device can drive the first valve stem 102 and the second valve stem 203 to move along their own axial direction, so that the first valve stem 102 is reset and the return port 206 is connected to the other of the first working port 207 and the second working port 208.

[0052] Understandably, the first working port 207 and the second working port 208 are respectively used to connect to the hydraulic cylinder to drive the piston rod of the hydraulic cylinder to extend and retract. For example, when liquid flows into the hydraulic cylinder through the first working port 207 and liquid in the hydraulic cylinder flows out through the second working port 208, the piston rod of the hydraulic cylinder extends; when liquid flows into the hydraulic cylinder through the second working port 208 and liquid in the hydraulic cylinder flows out through the first working port 207, the piston rod of the hydraulic cylinder retracts.

[0053] Specifically, such as Figure 3 and Figure 4 As shown, in the pilot-operated internal feedback proportional cone valve 100 of this embodiment, during use, when the first valve stem 102 moves to the right, the high-pressure control fluid in the pilot valve 1 enters the third valve chamber 202. Under the action of the high-pressure control fluid, the third valve stem 204 moves to the left, so that the inlet port 205 and the first working port 207 are connected. The liquid entering the main valve 2 through the inlet port 205 flows into the hydraulic cylinder through the first working port 207. When the third valve stem 204 moves to the left, since the third valve stem 204 is connected to the mechanical feedback device, the third valve stem 204 drives the mechanical feedback device. The mechanical feedback device drives the first valve stem 102 to move to the left to reset, and at the same time drives the second valve stem 203 to move to the right, so that the return port 206 is connected to the second working port 208. The liquid flowing out of the hydraulic cylinder flows into the main valve 2 through the return port 206 and then flows out of the main valve 2 through the return port 206.

[0054] Therefore, compared with the proportional valves in related technologies that use sensor feedback, the pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention, by setting a mechanical feedback device, with the first valve stem 102, the second valve stem 203 and the third valve stem 204 all being connected to the mechanical feedback device for transmission, enables the first valve stem 102 and the second valve stem 203 to react quickly when the pilot valve 1 drives the third valve stem 204 to move, thereby improving the response speed of the pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention, and thus improving the control accuracy of the pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention.

[0055] Therefore, the pilot-operated internal feedback proportional cone valve 100 of the present invention has the advantages of high control accuracy.

[0056] In some embodiments, the pilot-operated internal feedback proportional cone valve 100 of the present invention further includes a first transmission member 3, a second transmission member 4, and a third transmission member 5.

[0057] The first transmission component 3 has a first connecting part 301 and a first mating part 302. The first connecting part 301 is connected to the first valve stem 102. The rotation of the first mating part 302 can drive the first valve stem 102 to move along its axial direction.

[0058] The second transmission component 4 has a second connecting part 401 and a second mating part 402. The second connecting part 401 is connected to the second valve stem 203, and the second mating part 402 is mated and connected to the first mating part 302. The rotation of the second mating part 402 can drive the second valve stem 203 to move along its axial direction and drive the first mating part 302 to rotate.

[0059] The third transmission component 5 has a third connecting part 501 and a third mating part 502. The third connecting part 501 is connected to the third valve stem 204, and the third mating part 502 is mated to the second mating part 402. The third valve stem 204 can rotate along its axial direction to drive the third mating part 502 to rotate, and the rotation of the third mating part 502 can drive the second mating part 402 to rotate.

[0060] Specifically, such as Figures 1 to 4 As shown, the first transmission component 3, the second transmission component 4, and the third transmission component 5 are arranged sequentially from top to bottom. When the first valve stem 102 moves to the right, the high-pressure control fluid in the pilot valve 1 enters the third valve chamber 202. Under the action of the high-pressure control fluid, the third valve stem 204 moves to the left, so that the inlet port 205 and the first working port 207 are connected. The liquid entering the main valve 2 through the inlet port 205 flows into the hydraulic cylinder through the first working port 207. When the third valve stem 204 moves to the left, it drives the third mating part 502 to rotate. The rotation of the third mating part 502 drives the second mating part 402 to rotate. The rotation of the second mating part 402 drives the first mating part 302 to rotate, so that the first valve stem 102 moves to the left to reset. At the same time, the rotation of the second mating part 402 also drives the second valve stem 203 to move to the right, so that the return port 206 is connected to the second working port 208. The liquid flowing out of the hydraulic cylinder flows into the valve body through the return port 206 and then flows out of the main valve 2 through the return port 206.

[0061] Therefore, the pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention realizes the transmission feedback of the first valve stem 102, the second valve stem 203 and the third valve stem 204 by setting the mechanical feedback device with the first transmission member 3, the second transmission member 4 and the third transmission member 5, which makes the mechanical feedback device simple in structure and fast in transmission.

[0062] In some embodiments, the first mating part 302, the second mating part 402 and the third mating part 502 are all gears, and the first mating part 302 and the third mating part 502 are both engaged with the second mating part 402.

[0063] For example, such as Figure 1 and Figure 3 As shown, the pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention includes a support frame connected to the pilot valve 1 and the main valve 2. The first mating part 302, the second mating part 402, and the third mating part 502 are all rotatably mounted on the support frame via a rotating shaft. By arranging the first mating part 302, the second mating part 402, and the third mating part 502 in a gear-like meshing transmission configuration, it is beneficial to further improve the transmission accuracy of the mechanical feedback device, further improve the linearity of the pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention, and thus further improve the control accuracy of the pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention.

[0064] Of course, in other embodiments, the first mating part 302, the second mating part 402, and the third mating part 502 are all sprockets, and the first mating part 302 and the third mating part 502 are connected to the second mating part 402 by a chain. It should be noted that the specifications of the sprockets need to be configured according to the displacement of the first valve stem 102, the second valve stem 203, and the third valve stem 204.

[0065] In some embodiments, the first valve stem 102 is threadedly connected to the first connecting portion 301, the second valve stem 203 is threadedly connected to the second connecting portion 401, and the third valve stem 204 is threadedly connected to the third connecting portion 501 via a ball screw pair.

[0066] For example, such as Figures 1 to 4 As shown, the right end of the first valve stem 102 is connected to the first connecting part 301 via a non-self-locking thread. The right end of the first valve stem 102 has a first external thread, and the first connecting part 301 has a first internal thread that matches the first external thread. The right end of the second valve stem 203 is connected to the second connecting part 401 via a non-self-locking thread. The right end of the second valve stem 203 has a second external thread, and the second connecting part 401 has a second internal thread that matches the second external thread. The right end of the third valve stem 204 is connected to the third connecting part 501 via a non-self-locking ball screw.

[0067] Specifically, rotating the first valve stem 102 causes it to move to the right under the action of the screw thread. It should be noted that the first mating part 302 does not rotate during this rotation. When the first valve stem 102 moves to the right, the high-pressure control fluid in the pilot valve 1 enters the third valve chamber 202. The third valve stem 204 moves to the left under the pushing action of the high-pressure control fluid, connecting the inlet port 205 and the first working port 207. The fluid entering the main valve 2 through the inlet port 205 flows into the hydraulic cylinder through the first working port 207. When the third valve stem 204 moves to the left, the third mating part 502 rotates under the action of the ball screw. This rotation of the third mating part 502 drives the second mating part 402 to rotate, which in turn drives the first mating part 302 to rotate. When the first mating part 302 rotates, the first valve stem 102 moves to the left and resets under the action of the threaded connection. When the second mating part 402 rotates, the second valve stem 203 moves to the right under the action of the thread, so that the return port 206 is connected to the second working port 208. The liquid flowing out of the hydraulic cylinder flows into the valve body through the return port 206 and then flows out of the main valve 2 through the return port 206.

[0068] In some embodiments, the pilot-operated internal feedback proportional cone valve 100 of the present invention further includes a drive transducer. The drive device includes a drive member 6 and a connector 7. The output part of the drive member 6 is connected to one end of the connector 7, and the other end of the connector 7 is connected to the first valve stem 102 via a spline. The drive member 6 is used to drive the first valve stem 102 to move along its axial direction.

[0069] For example, such as Figure 1 and Figure 3 As shown, the driving component 6 can be a stepper motor or a servo motor. The output shaft of the motor is fixedly connected to the left end of the connecting component 7, and the right end of the connecting rod is connected to the left end of the first valve stem 102 via a spline, so that while the output shaft of the motor drives the first valve stem 102 to rotate, the first valve stem 102 can also move relative to the connecting component 7. Thus, by setting a driving transpose to drive the first valve stem 102, proportional control of the pilot-operated internal feedback proportional cone valve 100 circuit is realized, which is beneficial to realizing the digital control of the pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention.

[0070] In some embodiments, the first valve chamber 101 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 sequentially. The second valve chamber 201 has a third chamber 2011, a second low-pressure chamber 2012, and a fourth chamber 2013 arranged sequentially. The third valve chamber 202 has a first control chamber 2021, a third high-pressure chamber 2022, a fifth chamber 2023, a third low-pressure chamber 2024, a sixth chamber 2025, a fourth high-pressure chamber 2026, and a second control chamber 2027 arranged sequentially. The first chamber 1012 is connected to the first control chamber 2021, the second chamber 1014 is connected to the second control chamber 2027, the first high-pressure chamber 1011 to the fourth high-pressure chamber 2026 are all connected to the inlet 205, the first low-pressure chamber 1013 to the third low-pressure chamber 2024 are all connected to the return port 206, the third chamber 2011 and the fifth chamber 2023 are all connected to the first working port 207, and the fourth chamber 2013 and the sixth chamber 2025 are all connected to the second working port 208.

[0071] Specifically, such as Figure 1 and Figure 3 As shown, the first valve chamber 101, from left to right, is arranged with 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. The second valve chamber 201, from left to right, is arranged with a third chamber 2011, a second low-pressure chamber 2012, and a fourth chamber 2013. The third valve chamber 202, from left to right, is arranged with a first control chamber 2021, a third high-pressure chamber 2022, a fifth chamber 2023, a third low-pressure chamber 2024, a sixth chamber 2025, a fourth high-pressure chamber 2026, and a second control chamber 2027.

[0072] The pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention has a first state and a second state.

[0073] In the first state, the second high-pressure chamber 1015 is connected to the second chamber 1014, and the liquid in the second high-pressure chamber 1015 flows into the second control chamber 2027 through the second chamber 1014, so that the third valve stem 204 moves. The first chamber 1012 is connected to the first low-pressure chamber 1013, so that the liquid in the first control chamber 2021 flows into the first low-pressure chamber 1013 through the first chamber 1012. The third high-pressure chamber 2022 is connected to the fifth chamber 2023, and the liquid in the third high-pressure chamber 2022 flows into the fifth chamber 2023 and flows out through the first working port 207. The fourth chamber 2013 is connected to the second low-pressure chamber 2012, and the liquid flowing in through the second working port 208 flows into the second low-pressure chamber 2012 through the fourth chamber 2013 and flows out through the return port 206.

[0074] In the second state, the first high-pressure chamber 1011 is connected to the first chamber 1012, and the high-pressure control liquid in the first high-pressure chamber 1011 flows into the first control chamber 2021 through the first chamber 1012, causing the third valve stem 204 to move. The second chamber 1014 is connected to the first low-pressure chamber 1013, so that the liquid in the second control chamber 2027 flows into the first low-pressure chamber 1013 through the second chamber 1014. The fourth high-pressure chamber 2026 is connected to the sixth chamber 2025, and the liquid in the fourth high-pressure chamber 2026 flows into the sixth chamber 2025 and flows out through the second working port 208. The third chamber 2011 is connected to the second low-pressure chamber 2012, and the liquid flowing in through the first working port 207 flows into the second low-pressure chamber 2012 through the third chamber 2011 and flows out through the return port 206.

[0075] Specifically, such as Figure 3 and Figure 4 As shown, in the first state, the pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention drives the first valve stem 102 to rotate, causing the first valve stem 102 to move to the right. During the movement of the second valve stem 203 to the right, the second high-pressure chamber 1015 and the second chamber 1014 are connected, and the liquid in the second high-pressure chamber 1015 flows into the second control chamber 2027 through the second chamber 1014, thereby pushing the third valve stem 204 to the left. The movement of the third valve stem 204 to the left drives the second valve stem 203 to the right, causing the first chamber 1012 and the first low-pressure chamber 1013 to be connected. The liquid in the first control chamber 2021 flows into the first low-pressure chamber 1013 through the first chamber 1012, and the third high-pressure chamber 2022 and the fifth chamber 2023 are connected. The liquid in the third high-pressure chamber 2022 flows into the fifth chamber 2023 and enters the hydraulic cylinder through the first working port 207. The fourth chamber 2013 is connected to the second low-pressure chamber 2012. The liquid flowing out of the hydraulic cylinder flows into the main valve 2 through the second working port 208, and then flows into the second low-pressure chamber 2012 through the fourth chamber 2013, finally flowing out through the return port 206. In the first state, the piston rod of the hydraulic cylinder of the pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention is extended.

[0076] In the second state, the pilot-operated internal feedback proportional cone valve 100 of this embodiment of the invention drives the first valve stem 102 to rotate, so that the first valve stem 102 moves to the left. During the leftward movement of the second valve stem 203, the first high-pressure chamber 1011 and the first chamber 1012 are connected, allowing liquid in the first high-pressure chamber 1011 to flow into the first control chamber 2021 through the first chamber 1012, thus pushing the third valve stem 204 to move to the right. The second chamber 1014 and the first low-pressure chamber 1013 are connected, allowing liquid in the second control chamber 2027 to flow into the first low-pressure chamber 1013 through the second chamber 1014. The fourth high-pressure chamber 2026 and the sixth chamber 2025 are connected, allowing liquid in the fourth high-pressure chamber 2026 to flow into the sixth chamber 2025 and out through the second working port 208 into the hydraulic cylinder. The third chamber 2011 and the second low-pressure chamber 2012 are connected, allowing liquid flowing into the first working port 207 to flow into the second low-pressure chamber 2012 through the third chamber 2011 and out through the return port 206. In the first state, the piston rod of the hydraulic cylinder of the pilot-operated internal feedback proportional cone valve 100 of this embodiment retracts.

[0077] In some embodiments, the pilot-operated internal feedback proportional cone valve 100 of the present invention further includes a first cone valve core 801, a second cone valve core 802, a third cone valve core 803, a fourth cone valve core 804, a fifth cone valve core 805, and a sixth cone valve core 806. The first cone valve core 801 and the second cone valve core 802 are sleeved on the first valve stem 102 and are movable along the axial direction of the first valve stem 102. The third cone valve core 803 and the fourth cone valve core 804 are sleeved on the second valve stem 203 and are movable along the axial direction of the second valve stem 203. The fifth cone valve core 805 and the sixth cone valve core 806 are sleeved on the third valve stem 204 and are movable along the axial direction of the third valve stem 204.

[0078] The first cone valve core 801 is located in the first high-pressure chamber 1011 and is used to open and close the first high-pressure chamber 1011 and the first chamber 1012. The second cone valve core 802 is located in the second high-pressure chamber 1015 and is used to open and close the second high-pressure chamber 1015 and the second chamber 1014. The third cone valve core 803 is located in the third chamber 2011 and is used to open and close the third chamber 2011 and the second low-pressure chamber 2012. The fourth cone valve core 804 is located in the fourth chamber 2013 and is used to open and close the fourth chamber 2013 and the second low-pressure chamber 2012. The fifth cone valve core 805 is located in the third high-pressure chamber 2022 and is used to open and close the third high-pressure chamber 2022 and the fifth chamber 2023. The sixth cone valve core 806 is located in the fourth high-pressure chamber 2026 and is used to open and close the fourth high-pressure chamber 2026 and the sixth chamber 2025.

[0079] Specifically, for example, such as Figures 1 to 4As shown, when the first valve stem 102 moves to the right, the first cone valve core 801 remains stationary, blocking the first high-pressure chamber 1011 and the first chamber 1012. The first valve stem 102 drives the second cone valve core 802 to move to the right, connecting the second high-pressure chamber 1015 and the second chamber 1014. When the first valve stem 102 moves to the left, the second cone valve core 802 remains stationary, blocking the second high-pressure chamber 1015 and the second chamber 1014. The first valve stem 102 drives the first cone valve core 801 to move to the left, connecting the first high-pressure chamber 1011 and the first chamber 1012.

[0080] When the second valve stem 203 moves to the right, the third cone valve core 803 remains stationary, blocking the third chamber 2011 and the second low-pressure chamber 2012. The second valve stem 203 then moves the fourth cone valve core 804 to the right, opening the fourth chamber 2013 and the second low-pressure chamber 2012. When the second valve stem 203 moves to the left, the fourth cone valve core 804 remains stationary, blocking the fourth chamber 2013 and the second low-pressure chamber 2012. The second valve stem 203 then moves the third cone valve core 803 to the left, opening the third chamber 2011 and the second low-pressure chamber 2012.

[0081] When the third valve stem 204 moves to the right, the fifth cone valve core 805 remains stationary, blocking the third high-pressure chamber 2022 and the fifth chamber 2023. The third valve stem 204 then moves the sixth cone valve core 806 to the right, opening the fourth high-pressure chamber 2026 and the sixth chamber 2025. When the third valve stem 204 moves to the left, the sixth cone valve core 806 remains stationary, blocking the fourth high-pressure chamber 2026 and the sixth chamber 2025. The third valve stem 204 then moves the sixth cone valve core 806 to the left, opening the third high-pressure chamber 2022 and the fifth chamber 2023.

[0082] In some embodiments, the pilot-operated internal feedback proportional cone valve 100 of the present invention further includes a first reset member 901, a second reset member 902, a third reset member 903, a fourth reset member 904, a fifth reset member 905, and a sixth reset member 906. The first reset member 901 is located in the first high-pressure chamber 1011, and its two ends abut against the bottom wall of the first high-pressure chamber 1011 and the first cone valve core 801, respectively. The second reset member 902 is located in the second high-pressure chamber 1015, and its two ends abut against the bottom wall of the second high-pressure chamber 1015 and the first cone valve core 801, respectively. The third reset member 903 is located in the third chamber 2. Within chamber 011, the two ends of the third reset member 903 abut against the bottom wall of the third chamber 2011 and the third cone valve core 803, respectively. The fourth reset member 904 is located within the fourth chamber 2013, with its two ends abutting against the bottom wall of the fourth chamber 2013 and the fourth cone valve core 804, respectively. The fifth reset member 905 is located within the third high-pressure chamber 2022, with its two ends abutting against the bottom wall of the third high-pressure chamber 2022 and the fifth cone valve core 805, respectively. The sixth reset member 906 is located within the fourth high-pressure chamber 2026, with its two ends abutting against the bottom wall of the fourth high-pressure chamber 2026 and the sixth cone valve core 806, respectively.

[0083] For example, such as Figures 1 to 4 As shown, the first reset component 901 to the sixth reset component 906 are all reset springs.

[0084] The first reset member 901 and the second reset member 902 are sleeved on the first valve stem 102. The left end of the first reset member 901 abuts against the bottom wall of the first high-pressure chamber 1011, and the right end of the first reset member 901 abuts against the left end of the first cone valve core 801. When the first valve stem 102 moves the first cone valve core 801 to the left, the first reset member 901 is deformed by compression. When the first valve stem 102 resets to the right, the first reset member 901 recovers its elastic deformation and pushes the first cone valve core 801 to the right to reset. The right end of the second reset member 902 abuts against the bottom wall of the second high-pressure chamber 1015, and the left end of the first reset member 901 abuts against the right end of the second cone valve core 802. When the first valve stem 102 moves the second cone valve core 802 to the right, the second reset member 902 is deformed by compression. When the first valve stem 102 resets to the left, the second reset member 902 recovers its elastic deformation and pushes the second cone valve core 802 to the left to reset.

[0085] The third reset member 903 and the fourth reset member 904 are sleeved on the second valve stem 203. The left end of the third reset member 903 abuts against the bottom wall of the third cavity 2011, and the right end of the third reset member 903 abuts against the left end of the third cone valve core 803. When the second valve stem 203 drives the third cone valve core 803 to move to the left, the third reset member 903 is compressed and deformed. When the second valve stem 203 resets to the right, the third reset member 903 restores its elastic deformation and pushes the third cone valve core 803 to move to the right and reset. The right end of the fourth reset member 904 abuts against the bottom wall of the fourth cavity 2013, and the left end of the third reset member 903 abuts against the right end of the fourth cone valve core 804. When the second valve stem 203 drives the fourth cone valve core 804 to move to the right, the fourth reset member 904 is squeezed and deformed. When the second valve stem 203 resets to the left, the fourth reset member 904 restores its elastic deformation and pushes the fourth cone valve core 804 to move to the left and reset.

[0086] The fifth reset component 905 and the sixth reset component 906 are sleeved on the third valve stem 204. The left end of the fifth reset component 905 abuts against the bottom wall of the third high-pressure chamber 2022, and the right end of the fifth reset component 905 abuts against the left end of the fifth cone valve core 805. When the third valve stem 204 drives the fifth cone valve core 805 to move to the left, the fifth reset component 905 is compressed and deformed. When the third valve stem 204 resets to the right, the fifth reset component 905 restores its elastic deformation and pushes the fifth cone valve core 805 to move to the right and reset. The right end of the sixth reset member 906 abuts against the bottom wall of the fourth high-pressure chamber 2026, and the left end of the fifth reset member 905 abuts against the right end of the sixth cone valve core 806. When the third valve stem 204 drives the sixth cone valve core 806 to move to the right, the sixth reset member 906 is squeezed and deformed. When the third valve stem 204 resets to the left, the sixth reset member 906 restores its elastic deformation and pushes the sixth cone valve core 806 to move to the left and reset.

[0087] In some embodiments, the first valve stem 102 further includes a first protrusion 1021 and a second protrusion 1022 located within the first valve cavity 101, the first protrusion 1021 being disposed adjacent to the first cone valve core 801, and the second protrusion 1022 being disposed adjacent to the second cone valve core 802. The second valve stem 203 further includes a third protrusion 2031 and a fourth protrusion 2032 located within the second valve cavity 201, the third protrusion 2031 being disposed adjacent to the third cone valve core 803, and the fourth protrusion 2032 being disposed adjacent to the fourth cone valve core 804. The third valve stem 204 further includes a fifth protrusion 2041 and a sixth protrusion 2042 located within the third valve cavity 202, the fifth protrusion 2041 being disposed adjacent to the fifth cone valve core 805, and the sixth protrusion 2042 being disposed adjacent to the sixth cone valve core 806.

[0088] In the first state, the second protrusion 1022 abuts against the second cone valve core 802, so that the second cone valve core 802 conducts the second high-pressure chamber 1015 and the second chamber 1014; the fourth protrusion 2032 abuts against the fourth cone valve core 804, so that the fourth cone valve core 804 conducts the fourth chamber 2013 and the second low-pressure chamber 2012; and the fifth protrusion 2041 abuts against the fifth cone valve core 805, so that the fifth cone valve core 805 conducts the third high-pressure chamber 2022 and the fifth chamber 2023.

[0089] In the second state, the first protrusion 1021 abuts against the first cone valve core 801, so that the first cone valve core 801 conducts the first high-pressure chamber 1011 and the first chamber 1012; the third protrusion 2031 abuts against the third cone valve core 803, so that the third cone valve core 803 conducts the third chamber 2011 and the second low-pressure chamber 2012; and the sixth protrusion 2042 abuts against the sixth cone valve core 806, so that the sixth cone valve core 806 conducts the fourth high-pressure chamber 2026 and the sixth chamber 2025.

[0090] For example, such as Figures 1 to 4 As shown, the first protrusion 1021 and the second protrusion 1022 are located within the first valve chamber 101. By providing the first protrusion 1021 and the second protrusion 1022 to push the first cone valve core 801 and the second cone valve core 802, the first valve stem 102 has a simple structure and is easy to operate. The third protrusion 2031 and the fourth protrusion 2032 are located within the second valve chamber 201. By providing the third protrusion 2031 and the fourth protrusion 2032 to push the third cone valve core 803 and the fourth cone valve core 804, the second valve stem 203 has a simple structure and is easy to operate. The fifth protrusion 2041 and the sixth protrusion 2042 are located within the third valve chamber 202. By providing the fifth protrusion 2041 and the sixth protrusion 2042 to push the fifth cone valve core 805 and the sixth cone valve core 806, the third valve stem 204 has a simple structure and is easy to operate.

[0091] The hydraulic system of this invention includes a pilot-operated internal feedback proportional cone valve 100 and a hydraulic cylinder. The pilot-operated internal feedback proportional cone valve 100 is the pilot-operated internal feedback proportional cone valve 100 described in any of the above embodiments. The pilot-operated internal feedback proportional cone valve 100 is connected to the hydraulic cylinder to drive the piston rod of the hydraulic cylinder to move.

[0092] Therefore, the hydraulic system of this invention has the advantages of high control precision.

[0093] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0094] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0095] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0096] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0097] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0098] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A pilot-operated internal feedback proportional cone valve, characterized in that, include: A pilot valve having a first valve chamber, the pilot valve including a first valve stem movably disposed on the pilot valve along its axial direction; The main valve has a second valve chamber and a third valve chamber connected together. The first valve chamber is connected to the third valve chamber. The main valve also includes a second valve stem and a third valve stem. The second valve stem is movably disposed on the main valve along its axial direction and a part of the second valve stem is placed in the second valve chamber. The third valve stem is movably disposed on the main valve along its axial direction and a part of the third valve stem is placed in the third valve chamber. The main valve has an inlet, a return port, a first working port, and a second working port. and A mechanical feedback device, wherein the first valve stem, the second valve stem, and the third valve stem are all connected to the mechanical feedback device for transmission; Specifically, when the first valve stem moves along its axial direction, the pilot valve drives the third valve stem to move along its axial direction so that the inlet port is connected to one of the first working port and the second working port. When the third valve stem moves along its axial direction, the mechanical feedback device can drive the first valve stem and the second valve stem to move along their own axial direction so that the first valve stem is reset and the return port is connected to the other of the first working port and the second working port.

2. The pilot-operated internal feedback proportional cone valve according to claim 1, characterized in that, Also includes: A first transmission component has a first connecting part and a first mating part. The first connecting part is connected to the first valve stem. Rotation of the first mating part can drive the first valve stem to move along its axial direction. A second transmission component has a second connecting portion and a second mating portion. The second connecting portion is connected to the second valve stem, and the second mating portion is mated with the first mating portion. Rotation of the second mating portion can drive the second valve stem to move axially and also drive the first mating portion to rotate. The third transmission component has a third connecting part and a third mating part. The third connecting part is connected to the third valve stem, and the third mating part is mated and connected to the second mating part. The third valve stem can rotate along its axial direction to drive the third mating part to rotate, and the rotation of the third mating part can drive the second mating part to rotate.

3. The pilot-operated internal feedback proportional cone valve according to claim 2, characterized in that, The first mating part, the second mating part, and the third mating part are all gears, and the first mating part and the third mating part mesh with the second mating part; or The first mating part, the second mating part, and the third mating part are all sprockets, and the first mating part and the third mating part are connected to the second mating part by a chain.

4. The pilot-operated internal feedback proportional cone valve according to claim 2, characterized in that, The first valve stem is threaded to the first connecting part, the second valve stem is threaded to the second connecting part, and the third valve stem is threaded to the third connecting part through a ball screw pair.

5. The pilot-operated internal feedback proportional cone valve according to any one of claims 1-4, characterized in that, It also includes a drive device, which includes a drive component and a connector. The output of the drive component is connected to one end of the connector, and the other end of the connector is connected to the first valve stem via a spline. The drive component is used to drive the first valve stem to move along its axial direction.

6. The pilot-operated internal feedback proportional cone valve according to claim 5, characterized in that, The first valve chamber 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 second valve chamber has a third chamber, a second low-pressure chamber, and a fourth chamber arranged in sequence. The third valve chamber has a first control chamber, a third high-pressure chamber, a fifth chamber, a third low-pressure chamber, a sixth chamber, a fourth high-pressure chamber, and a second control chamber arranged in sequence. The first chamber is connected to the first control chamber, and the second chamber is connected to the second control chamber. The first high-pressure chamber, the second high-pressure chamber, the third high-pressure chamber, and the fourth high-pressure chamber are all connected to the inlet. The first low-pressure chamber, the second low-pressure chamber, and the third low-pressure chamber are all connected to the return port. The third chamber and the fifth chamber are both connected to the first working port, and the fourth chamber and the sixth chamber are both connected to the second working port. The pilot-operated internal feedback proportional cone valve has a first state and a second state. In the first state, the second high-pressure chamber is connected to the second chamber, and the liquid in the second high-pressure chamber flows into the second control chamber through the second chamber to move the third valve stem. The first chamber is connected to the first low-pressure chamber, so that the liquid in the first control chamber flows into the first low-pressure chamber through the first chamber. The third high-pressure chamber is connected to the fifth chamber, and the liquid in the third high-pressure chamber flows into the fifth chamber and flows out through the first working port. The fourth chamber is connected to the second low-pressure chamber, and the liquid flowing into the second working port flows into the second low-pressure chamber through the fourth chamber and flows out through the return port. In the second state, the first high-pressure chamber is connected to the first cavity, and the liquid in the first high-pressure chamber flows into the first control chamber through the first cavity to move the third valve stem. The second cavity is connected to the first low-pressure chamber, so that the liquid in the second control chamber flows into the first low-pressure chamber through the second cavity. The fourth high-pressure chamber is connected to the sixth cavity, and the liquid in the fourth high-pressure chamber flows into the sixth cavity and flows out through the second working port. The third cavity is connected to the second low-pressure chamber, and the liquid flowing in through the first working port flows into the second low-pressure chamber through the third cavity and flows out through the return port.

7. The pilot-operated internal feedback proportional cone valve according to claim 6, characterized in that, Also includes: A first cone valve core, a second cone valve core, a third cone valve core, a fourth cone valve core, a fifth cone valve core, and a sixth cone valve core. The first and second cone valve cores are sleeved on the first valve stem and are movable along the axial direction of the first valve stem. The third and fourth cone valve cores are sleeved on the second valve stem and are movable along the axial direction of the second valve stem. The fifth and sixth cone valve cores are sleeved on the third valve stem and are movable along the axial direction of the third valve stem. The first cone valve core is located within the first high-pressure chamber and is used to connect and disconnect the first high-pressure chamber and the first... The system comprises a second high-pressure chamber and a third high-pressure chamber, a fourth high-pressure chamber, a fifth high-pressure chamber, and a sixth high-pressure chamber.

8. The pilot-operated internal feedback proportional cone valve according to claim 7, characterized in that, It also includes a first reset component, a second reset component, a third reset component, a fourth reset component, a fifth reset component, and a sixth reset component. The first reset component is located in the first high-pressure chamber, and its two ends abut against the bottom wall of the first high-pressure chamber and the first conical valve core, respectively. The second reset component is located in the second high-pressure chamber, and its two ends abut against the bottom wall of the second high-pressure chamber and the first conical valve core, respectively. The third reset component is located in the third chamber, and its two ends abut against the bottom wall of the third chamber and the third conical valve core, respectively. The fourth reset component is located in the fourth chamber, and its two ends abut against the bottom wall of the fourth chamber and the fourth conical valve core, respectively. The fifth reset component is located in the third high-pressure chamber, and its two ends abut against the bottom wall of the third high-pressure chamber and the fifth conical valve core, respectively. The sixth reset component is located in the fourth high-pressure chamber, and its two ends abut against the bottom wall of the fourth high-pressure chamber and the sixth conical valve core, respectively.

9. The pilot-operated internal feedback proportional cone valve according to claim 8, characterized in that, The first valve stem further includes a first protrusion and a second protrusion located within the first valve cavity. The first protrusion is disposed adjacent to the first cone valve core, and the second protrusion is disposed adjacent to the second cone valve core. The second valve stem further includes a third protrusion and a fourth protrusion located within the second valve cavity. The third protrusion is disposed adjacent to the third cone valve core, and the fourth protrusion is disposed adjacent to the fourth cone valve core. The third valve stem further includes a fifth protrusion and a sixth protrusion located within the third valve cavity. The fifth protrusion is disposed adjacent to the fifth cone valve core, and the sixth protrusion is disposed adjacent to the sixth cone valve core. In the first state, the second protrusion abuts against the second cone valve core, so that the second cone valve core connects the second high-pressure chamber and the second chamber; the fourth protrusion abuts against the fourth cone valve core, so that the fourth cone valve core connects the fourth chamber and the second low-pressure chamber; and the fifth protrusion abuts against the fifth cone valve core, so that the fifth cone valve core connects the third high-pressure chamber and the fifth chamber. In the second state, the first protrusion abuts against the first cone valve core, so that the first cone valve core connects the first high-pressure chamber and the first chamber; the third protrusion abuts against the third cone valve core, so that the third cone valve core connects the third chamber and the second low-pressure chamber; and the sixth protrusion abuts against the sixth cone valve core, so that the sixth cone valve core connects the fourth high-pressure chamber and the sixth chamber.

10. A hydraulic system, characterized in that, include: A pilot-operated internal feedback proportional cone valve, wherein the pilot-operated internal feedback proportional cone valve is any one of the pilot-operated internal feedback proportional cone valves described in claims 1-9; and A hydraulic cylinder, wherein the pilot-operated internal feedback proportional cone valve is connected to the hydraulic cylinder to drive the piston rod of the hydraulic cylinder to move.

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