Logic valve and hydraulic control system

Abstract

The utility model relates to a logic valve and a hydraulic control system, and relates to the technical field of hydraulic valves, the logic valve comprises a cover plate, a valve sleeve, a valve element and a magnetic pushing piece, an inserting hole and a first control oil way are formed in the cover plate, and a pilot control valve communicating with the first control oil way is arranged on the cover plate; the valve sleeve is inserted into the inserting hole, and a through hole is formed in the side, away from the cover plate, of the valve sleeve. The valve element is inserted into the through hole, one end of the valve element and the cover plate are arranged in a spaced mode, an installation space communicated with the first control oil way is formed, an elastic element and a movable plate are arranged in the installation space, one end of the elastic element abuts against the movable plate, and the other end of the elastic element abuts against the valve element; the magnetic pushing part comprises a first electromagnet and a second electromagnet, the first electromagnet is arranged in the installation space and connected with the cover plate or the valve sleeve, the second electromagnet is installed in the valve element, and the first electromagnet and the second electromagnet attract or repel each other and are used for pushing the valve element to slide relative to the valve sleeve in the axis direction of the through hole.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic valves, and in particular to a logic valve and a hydraulic control system. Background Art

[0002] Logic valve, also known as two-way cartridge valve, is a new type of switch valve. It controls the flow direction, pressure and flow rate of oil in hydraulic control systems. It is widely used in hydraulic control systems of machine tools, die-casting machines, plastic injection molding machines and other equipment to control the operating status of the equipment.

[0003] The logic valve is mainly composed of an insert element (valve core), a pilot control valve, a control cover and an insert block (valve sleeve). The pilot control valve and the valve sleeve are both installed on the control cover, and the valve core is plugged into the valve sleeve. A control oil circuit is opened in the control cover, and a spring is arranged between the valve core and the control valve. When it is necessary to control the flow direction, pressure or flow of the oil, the relevant personnel opens the pilot control valve and injects hydraulic oil into the control oil circuit. After the hydraulic oil enters the control oil circuit, it presses the spring, causing the valve core to slide relative to the valve sleeve to control the on-off relationship between the oil inlet and the oil outlet on the valve sleeve.

[0004] However, since it takes a long time for the hydraulic oil to enter the control oil circuit from the pilot control valve and finally apply pressure to the spring, and for the hydraulic oil to exit the control oil circuit, the response speed of the logic valve is slow, resulting in a large delay in the hydraulic control system. Utility Model Content

[0005] The present application provides a logic valve with a faster response speed to reduce the delay of a hydraulic control system.

[0006] In the first aspect, the present application provides a logic valve adopting the following technical solution:

[0007] A logic valve, comprising:

[0008] The cover plate is provided with an insertion hole and a first control oil circuit, and a pilot control valve connected to the first control oil circuit is arranged on the cover plate;

[0009] A valve sleeve is inserted into the insertion hole, and a through hole and an oil outlet are provided on a side away from the cover plate, wherein the oil outlet is communicated with the through hole;

[0010] Valve core: inserted into the through hole, one end of the valve core is spaced apart from the cover plate to form an installation space connected to the first control oil circuit, and the other end of the valve core is spaced apart from the end surface of the valve sleeve away from the cover plate to form an oil inlet;

[0011] An elastic element and a movable plate are provided in the installation space, the movable plate is used to separate the installation space and the first control oil circuit, one end of the elastic element abuts against the movable plate, and the other end of the elastic element abuts against the valve core;

[0012] Magnetic driving member: includes a first electromagnet and a second electromagnet, wherein the first electromagnet is arranged in the installation space and connected to the cover plate or the valve sleeve, and the second electromagnet is installed in the valve core, and the first electromagnet and the second electromagnet attract or repel each other, and are used to push the valve core to slide relative to the valve sleeve along the axial direction of the through hole.

[0013] By adopting the above technical solution, when it is necessary to control the flow direction, pressure and flow rate of the oil, the pilot control valve and the magnetic driving member are made to work synchronously. When the pilot control valve passes the hydraulic oil into the first control oil circuit, or the hydraulic oil withdraws from the first control oil circuit, the first electromagnet and the second electromagnet can form an attractive force or a repulsive force (by changing the direction of the current) when energized, so as to drive the valve core to move before the hydraulic oil drives the valve core to move relative to the valve sleeve, so as to preliminarily control the relative position relationship between the valve core and the valve sleeve during the vacuum period, so that the logic valve has a faster response speed.

[0014] Optionally, the first electromagnet is ring-shaped, one side of the first electromagnet is in close contact with the cover plate, and the movable plate is placed in the annular cavity of the first electromagnet and contacts with the wall surface of the annular cavity of the first electromagnet, so as to transfer the heat generated by the first electromagnet when working to the hydraulic oil entering the first control oil circuit.

[0015] By adopting the above technical solution, during the operation of the first electromagnet, the resistance loss generated when the current passes through the coil will further generate heat, and the generated heat is further transferred to the hydraulic oil through the movable plate, thereby increasing the temperature of the hydraulic oil and reducing the viscosity of the hydraulic oil, thereby reducing the resistance to the flow of the hydraulic oil, thereby reducing the time required for the hydraulic oil to enter the first control oil circuit and be pushed out of the first control oil circuit, and further improving the response speed of the logic valve.

[0016] Optionally, the movable plate is made of heat-conducting material.

[0017] By adopting the above technical solution, the setting of the movable plate can better transfer heat to the hydraulic oil, increase the heating rate and temperature of the hydraulic oil, and help improve the response speed of the logic valve.

[0018] Optionally, a first step surface is provided on the wall surface of the through hole, the valve core includes a first connecting portion and a second connecting portion, the first connecting portion has an outer diameter greater than the second connecting portion, and is connected to the second connecting portion to form a second step surface;

[0019] The first step surface and the second step surface are combined to form a regulating cavity for hydraulic oil to enter. A second control oil circuit is opened on the cover plate. The second control oil circuit is connected to the regulating cavity to allow hydraulic oil to enter the regulating cavity and apply pressure to the second step surface.

[0020] By adopting the above technical solution, the hydraulic oil enters the regulating chamber from the second control oil circuit, applies pressure to the second step surface, pushes the valve core closer to the cover plate, and the hydraulic oil in the regulating chamber and the magnetic driving member work together to enable the hydraulic oil in the first control oil circuit to exit the first control oil circuit at an accelerated speed, thereby further improving the response speed of the logic valve.

[0021] Optionally, a mounting hole is formed at one end of the valve core close to the cover plate for the elastic element to extend into, and the elastic element abuts against a bottom wall of the mounting hole.

[0022] By adopting the above technical solution, the setting of the mounting hole limits the elastic element, preventing the elastic element from deviating when pushing the valve core to move relative to the valve sleeve, which helps to improve the stability of the movement process when the valve core moves relative to the valve sleeve.

[0023] Optionally, the second electromagnet is fixedly connected in the mounting hole, and the peripheral side wall of the second electromagnet is in close contact with the peripheral side wall of the mounting hole, so as to transfer the heat generated by the second electromagnet when working to the hydraulic oil in the regulating chamber.

[0024] By adopting the above technical solution, the second electromagnet is fixed in the mounting hole, and the heat generated during operation is conducted to the surrounding side walls of the mounting hole and finally to the regulating cavity, so as to heat the hydraulic oil in the regulating cavity and increase the speed at which the hydraulic oil enters or exits the regulating cavity, thereby further improving the response speed of the logic valve.

[0025] Optionally, the second electromagnet is ring-shaped and sleeved on the elastic element, and / or;

[0026] The second electromagnet is columnar, and one end of the second electromagnet abuts against the elastic element.

[0027] By adopting the above technical solution, when the electromagnet is ring-shaped, it can limit the elastic element while adjusting the relative position between the valve core and the valve sleeve and transferring heat to the hydraulic oil in the regulating chamber, thereby preventing the elastic element from shifting during movement.

[0028] Optionally, the thermal conductivity of the second connecting portion is greater than that of the first connecting portion.

[0029] By adopting the above technical solution, the heat generated by the second electromagnet during operation can be prevented from being consumed by the second connecting part, which helps to improve the efficiency of heating the hydraulic oil in the regulating chamber.

[0030] Optionally, a plurality of first mounting ring grooves are provided on the peripheral side wall of the valve core, and sealing rings are provided in each of the plurality of first mounting ring grooves and are arranged along the length direction of the valve core and evenly distributed on both sides of the regulating cavity.

[0031] By adopting the above technical solution, a first mounting ring groove is provided to mount a sealing ring, thereby preventing the hydraulic oil in the regulating chamber from leaking.

[0032] In the second aspect, the present application provides a hydraulic control system that adopts the following technical solution:

[0033] By adopting the above technical solution, the hydraulic control system has a higher response speed, which can enable machine tools, die-casting machines, plastic injection molding machines and other equipment equipped with the hydraulic control system to quickly change their working states.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. When it is necessary to control the flow direction, pressure and flow rate of the oil, the pilot control valve and the magnetic driving member are made to work synchronously. When the pilot control valve passes the hydraulic oil into the first control oil circuit, or the hydraulic oil withdraws from the first control oil circuit, the first electromagnet and the second electromagnet can form an attractive force or a repulsive force (by changing the direction of the current) when energized, so as to drive the valve core to move before the hydraulic oil drives the valve core to move relative to the valve sleeve, so as to preliminarily control the relative position relationship between the valve core and the valve sleeve during the vacuum period, so that the logic valve has a faster response speed.

[0036] 2. During the operation of the first electromagnet, the resistance loss caused by the current passing through the coil will further generate heat, and the generated heat will be further transferred to the hydraulic oil through the movable plate, which will increase the temperature of the hydraulic oil and reduce the viscosity of the hydraulic oil, thereby reducing the resistance to the flow of the hydraulic oil, thereby reducing the time required for the hydraulic oil to enter the first control oil circuit and push out of the first control oil circuit, further improving the response speed of the logic valve.

[0037] 3. The hydraulic oil enters the regulating chamber from the second control oil circuit, applies pressure to the second step surface, and pushes the valve core toward the cover plate. The hydraulic oil in the regulating chamber and the magnetic driving member work together to accelerate the hydraulic oil in the first control oil circuit to exit the first control oil circuit, and the response speed of the logic valve is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1It is a three-dimensional structural schematic diagram of the logic valve in this application;

[0039] Figure 2 is a schematic cross-sectional view of the logic valve in the present application;

[0040] Figure 3 It is a cross-sectional structural schematic diagram of the logic valve in this application from another perspective.

[0041] In the figure, 1, cover plate; 11, insertion hole; 12, first control oil circuit; 13, second control oil circuit; 2, valve sleeve; 21, through hole; 211, first step surface; 22, oil outlet; 23, oil inlet; 24, connecting hole; 25, second mounting ring groove; 3, valve core; 31, first connecting part; 311, mounting hole; 32, second connecting part; 33, second step surface; 34, first mounting ring groove; 4, magnetic pusher; 41, first electromagnet; 42, second electromagnet; 5, pilot control valve; 6, installation space; 7, elastic element; 8, movable plate; 9, adjusting chamber; 10, sealing ring. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1 -Attached Figure 3 , further details of this application are given.

[0043] A hydraulic control system, including a logic valve, referring to Figure 1 and Figure 2 The logic valve includes a cover plate 1, a valve sleeve 2, a valve core 3 and a magnetic pusher 4. The valve sleeve 2, the valve core 3 and the magnetic pusher 4 are located on the same side of the cover plate 1. Specifically, the cover plate 1 is provided with an insertion hole 11 and a first control oil circuit 12. The cover plate 1 is provided with a pilot control valve 5. The pilot control valve 5 is connected to the first control oil circuit 12 to inject hydraulic oil into the first control oil circuit 12.

[0044] The valve sleeve 2 is inserted into the insertion hole 11, and the side facing away from the cover plate 1 extends out of the insertion hole 11, and is provided with a through hole 21 and an oil outlet 22. The oil outlet 22 is provided on the peripheral side wall of the valve sleeve 2 and is connected with the through hole 21. The valve core 3 is placed in the through hole 21, and an end of the valve core 3 facing away from the cover plate 1 is spaced apart from the end face of the valve sleeve 2 facing away from the cover plate 1, so as to form an oil inlet 23.

[0045] When the pilot control valve 5 is opened and hydraulic oil is injected into the first control oil circuit 12, the hydraulic oil will push the valve core 3, causing the valve core 3 to move relative to the valve sleeve 2 in a direction away from the cover plate 1, and the peripheral side wall of the valve core 3 away from the cover plate 1 will block the oil outlet 22 (the degree of blocking is positively correlated with the moving distance of the valve core 3 away from the cover plate 1). Since the oil is continuously injected from the oil inlet 23, when it is necessary to connect the oil inlet 23 with the oil outlet 22, the injection of hydraulic oil into the first control oil circuit 12 is stopped, and the oil inlet 23 applies pressure to the valve core 3 during oil injection, causing the valve core 3 to move toward the cover plate 1.

[0046] Reference Figure 2 and Figure 3 , one end of the valve core 3 close to the cover plate 1 is spaced apart from the cover plate 1 to form an installation space 6 connected to the first control oil circuit 12, an elastic element 7 and a movable plate 8 are provided in the installation space 6, and the movable plate 8 is used to separate the installation space 6 and the first control oil circuit 12. Further, in this embodiment, the elastic element 7 is a spring, and in other embodiments, the elastic element 7 may also be an elastic block, such as a silicone block or a high-density sponge block;

[0047] One end of the spring abuts against the movable plate 8, and the other end of the spring abuts against the valve core 3. When hydraulic oil is injected into the first control oil circuit 12, the hydraulic oil applies pressure to the movable plate 8, and the pressure is further transmitted to the valve core 3 through the conduction of the spring to push the valve core 3 to move relative to the cover plate 1.

[0048] Reference Figure 2 and Figure 3 , further comprising a magnetic pusher 4, the magnetic pusher 4 and the valve core 3 are both located on the same side of the cover plate 1, specifically, the magnetic pusher 4 comprises a first electromagnet 41 and a second electromagnet 42, the first electromagnet 41 is arranged in the installation space 6, and is connected to the cover plate 1 or the valve sleeve 2, in this embodiment, the first electromagnet 41 is fixedly mounted on one side of the cover plate 1, and is in close contact with the cover plate 1, and the second electromagnet 42 is installed in the valve core 3, and is spaced apart from the first electromagnet 41;

[0049] By energizing the first electromagnet 41 and the second electromagnet 42 and adaptively adjusting the current direction in the first electromagnet 41 and the second electromagnet 42, a magnetic force of attraction or repulsion is generated between the first electromagnet 41 and the second electromagnet 42, driving the valve core 3 to move closer to or away from the cover plate 1 along the axial direction of the through hole 21.

[0050] In this embodiment, the first electromagnet 41 and the second electromagnet 42 are both externally connected to a power supply, and the power supply is arranged outside the logic valve. The first electromagnet 41 and the second electromagnet 42 are connected to the corresponding power supply through a wire, and the wire extends through the cover plate 1 and the valve sleeve 2 in sequence and extends into the installation space 6.

[0051] Furthermore, an electronic switch (such as a transistor or a relay) is provided between the power supply and the magnetic driving member 4 to change the direction of the current by controlling the on and off of the electronic switch. In other embodiments, a phase converter can also be used to change the phase of the current, thereby changing the direction of the current.

[0052] It should be noted that, in this embodiment, the power supply, wires and electronic switches are not shown.

[0053] When the oil inlet 23 and the oil outlet 22 need to be disconnected, the pilot control valve 5 and the magnetic pusher 4 are made to work synchronously. The pilot control valve 5 passes the hydraulic oil into the first control oil circuit 12, and the hydraulic oil finally applies pressure to the movable plate 8. In the process that the hydraulic oil finally acts on the movable plate 8 from the pilot control valve 5, the first electromagnet 41 and the second electromagnet 42 can form a repulsive force after being energized to drive the valve core 3 away from the cover plate 1, forming an initial control, so as to adjust the position state between the valve sleeve 2 and the valve core 3 when the hydraulic oil cannot adjust the position state between the valve sleeve 2 and the valve core 3.

[0054] When the oil inlet 23 and the oil outlet 22 need to be reconnected, the hydraulic oil needs to exit the first control oil circuit 12. During the process of the hydraulic oil exiting the first control oil circuit 12, the direction of the current flowing through one of the first electromagnet 41 or the second electromagnet 42 is reversed to form an attractive force between the first electromagnet 41 and the second electromagnet 42 to drive the valve core 3 to approach the cover plate 1, thereby accelerating the rate at which the hydraulic oil exits the first control oil circuit 12.

[0055] Reference Figure 2 In the present embodiment, the first electromagnet 41 is annular, and the movable plate 8 is correspondingly arranged in a circular plate shape and is placed in the annular cavity of the first electromagnet 41. The peripheral side wall of the movable plate 8 is in contact with the wall surface of the annular cavity of the first electromagnet 41, so as to transfer the heat generated by the first electromagnet 41 during operation to the hydraulic oil entering the first control oil circuit 12.

[0056] Furthermore, the movable plate 8 is made of a heat-conducting material. In the present embodiment, the movable plate 8 is made of a non-metallic heat-conducting material, such as a graphite plate, a ceramic sheet, a silicone plate or a high-performance polymer. In other embodiments, the movable plate 8 may also be made of a metal heat-conducting material, such as copper, aluminum, etc., to ensure that the movable plate 8 can fully transfer heat to the hydraulic oil in the first control oil circuit 12.

[0057] Reference Figure 2 and Figure 3A first step surface 211 is provided on the wall surface of the through hole 21, and the valve core 3 includes a first connection portion 31 and a second connection portion 32, wherein the first connection portion 31 is closer to the cover plate 1 than the second connection portion 32, and the outer diameter of the first connection portion 31 is greater than that of the second connection portion 32, and the first connection portion 31 is connected to the second connection portion 32 to form a second step surface 33;

[0058] The first step surface 211 and the second step surface 33 are surrounded by each other to form a regulating chamber 9 for hydraulic oil to enter. In the present embodiment, the regulating chamber 9 is formed in the insertion hole 11. Correspondingly, a second control oil circuit 13 is opened on the cover plate 1, and a connecting hole 24 is opened on the peripheral side wall of the valve sleeve 2. The second control oil circuit 13 is connected to the regulating chamber 9 through the connecting hole 24, so that the hydraulic oil enters the regulating chamber 9 and applies pressure to the second step surface 33.

[0059] The hydraulic oil enters the regulating chamber 9 from the second control oil circuit 13 , applies pressure to the second step surface 33 , and pushes the valve core 3 toward the cover plate 1 . The hydraulic oil in the regulating chamber 9 and the magnetic pusher 4 work together to enable the hydraulic oil in the first control oil circuit 12 to exit the first control oil circuit 12 at an accelerated speed.

[0060] It should be noted that in other embodiments, the adjustment hole may also be formed outside the insertion hole 11 . In this case, it is no longer necessary to additionally open the second control oil circuit 13 on the cover plate 1 , and only the connecting hole 24 needs to be opened on the valve sleeve 2 .

[0061] Reference Figure 2 and Figure 3 A mounting hole 311 is provided at one end of the valve core 3 close to the cover plate 1 for the elastic element 7 to extend into, and the elastic element 7 abuts against the bottom wall of the mounting hole 311. Furthermore, the second electromagnet 42 is fixedly connected in the mounting hole 311, and the peripheral side wall of the second electromagnet 42 is tightly attached to the peripheral side wall of the mounting hole 311, so as to transfer the heat generated by the second electromagnet 42 when working to the hydraulic oil in the regulating chamber 9.

[0062] In this embodiment, the second electromagnet 42 is the same as the first electromagnet 41 and is both ring-shaped. The second electromagnet 42 is sleeved on the elastic element 7, and the length of the second electromagnet 42 is the same as the opening depth of the mounting hole 311 to better transfer heat to the surrounding side walls of the mounting hole 311.

[0063] It should be noted that in other embodiments, the second electromagnet 42 can also be set in a columnar shape, and one end of the second electromagnet 42 abuts against the elastic element 7 to ensure that the second electromagnet 42 can abut against the peripheral side wall of the mounting hole 311 to transfer heat to the hydraulic oil in the regulating chamber 9.

[0064] Furthermore, since the hydraulic oil in the regulating chamber 9 will contact the peripheral side wall of the second connecting part 32, in this embodiment, the thermal conductivity of the second connecting part 32 is greater than that of the first connecting part 31, so as to improve the heat transfer efficiency when the second electromagnet 42 transfers heat to the hydraulic oil in the regulating chamber 9.

[0065] Specifically, the first connection part 31 and the second connection part 32 are made of different metal materials, wherein the first connection part 31 is made of alloy steel (such as 12Cr2Ni4), and the second connection part 32 is made of pure metal (such as Cu), and the second connection part 32 is connected together by welding.

[0066] Further, refer to Figure 2 and Figure 3 A plurality of first mounting annular grooves 34 are provided on the peripheral side wall of the valve core 3. In the present embodiment, two first mounting annular grooves 34 are provided. Sealing rings 10 are provided in the two first mounting annular grooves 34 and are arranged along the length direction of the valve core 3 and are evenly distributed on both sides of the regulating chamber 9 to prevent leakage of the hydraulic oil in the regulating chamber 9. It should be noted that in other embodiments, the number of the first mounting annular grooves 34 can be further increased to enhance the sealing effect.

[0067] In addition, a plurality of second mounting annular grooves 25 are provided on the peripheral side wall of the valve sleeve 2. In the present embodiment, two second mounting annular grooves 25 are provided. The two second mounting annular grooves 25 are distributed on both sides of the connecting hole 24 along the length direction of the valve sleeve 2 to further prevent the hydraulic oil from leaking from the connecting hole 24.

[0068] The implementation principle of the embodiment of the present application is:

[0069] When it is necessary to control the flow direction, pressure and flow rate of the oil, the pilot control valve 5 and the magnetic pusher 4 are made to work synchronously. When the pilot control valve 5 passes the hydraulic oil into the first control oil circuit 12, or the hydraulic oil exits the first control oil circuit 12, the first electromagnet 41 and the second electromagnet 42 can form an attractive force or a repulsive force (by changing the direction of the current) when energized, so as to drive the valve core 3 to move before the hydraulic oil drives the valve core 3 to move relative to the valve sleeve 2, so as to preliminarily control the relative position relationship between the valve core 3 and the valve sleeve 2 during the vacuum period;

[0070] The heat generated by the first electromagnet 41 and the second electromagnet 42 during operation is further transferred to the hydraulic oil, so that the temperature of the hydraulic oil is increased to reduce the viscosity of the hydraulic oil, reduce the resistance of the hydraulic oil when flowing, and make the logic valve have a faster response speed.

[0071] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A logic valve, characterized in that: include: The cover plate (1) is provided with an insertion hole (11) and a first control oil circuit (12), and a pilot control valve (5) connected to the first control oil circuit (12) is arranged on the cover plate (1); A valve sleeve (2) is inserted into the insertion hole (11), and a through hole (21) and an oil outlet (22) are provided on a side facing away from the cover plate (1), wherein the oil outlet (22) is communicated with the through hole (21); A valve core (3) is inserted into the through hole (21), one end of the valve core (3) is spaced apart from the cover plate (1) to form an installation space (6) connected to the first control oil path (12), and the other end of the valve core (3) is spaced apart from the end surface of the valve sleeve (2) facing away from the cover plate (1) to form an oil inlet (23); An elastic element (7) and a movable plate (8) are provided in the installation space (6), the movable plate (8) being used to separate the installation space (6) and the first control oil circuit (12), one end of the elastic element (7) abutting against the movable plate (8), and the other end of the elastic element (7) abutting against the valve core (3); The magnetic driving member (4) comprises a first electromagnet (41) and a second electromagnet (42), wherein the first electromagnet (41) is arranged in the installation space (6) and connected to the cover plate (1) or the valve sleeve (2), and the second electromagnet (42) is installed in the valve core (3), and the first electromagnet (41) and the second electromagnet (42) attract or repel each other, and are used to drive the valve core (3) to slide relative to the valve sleeve (2) along the axial direction of the through hole (21).

2. A logic valve according to claim 1, characterized in that: The first electromagnet (41) is annular, one side of the first electromagnet (41) is in close contact with the cover plate (1), the movable plate (8) is placed in the annular cavity of the first electromagnet (41) and in contact with the wall surface of the annular cavity of the first electromagnet (41), and is used to transfer the heat generated by the first electromagnet (41) when working to the hydraulic oil entering the first control oil circuit (12).

3. A logic valve according to claim 2, characterized in that: The movable plate (8) is made of heat-conducting material.

4. A logic valve according to claim 1, characterized in that: A first step surface (211) is provided on the wall surface of the through hole (21); the valve core (3) comprises a first connecting portion (31) and a second connecting portion (32); the first connecting portion (31) has an outer diameter greater than that of the second connecting portion (32), and is connected to the second connecting portion (32) to form a second step surface (33); The first step surface (211) and the second step surface (33) are enclosed to form a regulating chamber (9) for hydraulic oil to enter. The cover plate (1) is provided with a second control oil circuit (13). The second control oil circuit (13) is connected to the regulating chamber (9) so that hydraulic oil can enter the regulating chamber (9) and apply pressure to the second step surface (33).

5. A logic valve according to claim 4, characterized in that: An installation hole (311) is provided at one end of the valve core (3) close to the cover plate (1) for the elastic element (7) to extend therein, and the elastic element (7) abuts against the bottom wall of the installation hole (311).

6. A logic valve according to claim 5, characterized in that: The second electromagnet (42) is fixedly connected in the mounting hole (311), and the peripheral side wall of the second electromagnet (42) is in close contact with the peripheral side wall of the mounting hole (311), so as to transfer the heat generated by the second electromagnet (42) when working to the hydraulic oil in the regulating chamber (9).

7. A logic valve according to claim 6, characterized in that: The second electromagnet (42) is ring-shaped and sleeved on the elastic element (7), and / or; The second electromagnet (42) is columnar, and one end of the second electromagnet (42) is in contact with the elastic element (7).

8. A logic valve according to claim 4, characterized in that: The thermal conductivity of the second connection portion (32) is greater than that of the first connection portion (31).

9. A logic valve according to claim 4, characterized in that: A plurality of first mounting annular grooves (34) are provided on the peripheral side wall of the valve core (3), and sealing rings (10) are provided in each of the plurality of first mounting annular grooves (34) and are arranged along the length direction of the valve core (3) and are evenly distributed on both sides of the regulating cavity (9).

10. A hydraulic control system, characterized in that: Comprising a logic valve as described in any one of claims 1-9.

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