Electromagnetic proportional valve

Abstract

The utility model relates to the technical field of proportional valves, in particular to an electromagnetic proportional valve. The electromagnetic proportional valve comprises a flux sleeve, a valve sleeve, a main valve element and a limiting piece, and an assembly hole is formed in one axial end of the flux sleeve. The axial end of the valve sleeve is coaxially installed in the assembling hole, and a first oil port and a second oil port are formed in the valve sleeve. The main valve element is arranged in the valve sleeve in a sliding mode in the axial direction of the valve sleeve so as to connect or disconnect the first oil port and the second oil port. The electromagnetic proportional valve has a first state, and in the first state, the limiting piece is installed in the assembling hole and can abut against the main valve element so as to limit the limiting position of the main valve element. The limiting piece is installed in the assembling hole of the flux sleeve to limit the limiting position of the main valve element, the probability that the through-flow area between the main valve element and the valve sleeve is excessively increased is reduced, the situation that the output actual flow exceeds the designed flow range is reduced, and therefore damage to terminal equipment or safety accidents caused by the situation is avoided; and the stability and the reliability of the electromagnetic proportional valve are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of proportional valves, in particular to an electromagnetic proportional valve. Background Art

[0002] In existing solenoid proportional valves, as the control signal to the solenoid coil gradually increases, the magnetic induction intensity of the coil's magnetic field increases. This compresses the spring inside the magnetic sleeve, and simultaneously, the movable iron moves the pilot valve core. Under the influence of oil pressure, the main valve core follows the pilot valve core, creating a certain flow area between the main valve core and the valve sleeve. The corresponding flow rate is then output from the valve sleeve's oil inlet to the valve sleeve's oil outlet, which is used to adjust the actuator's speed.

[0003] When the pressure of the external environment where the solenoid proportional valve is located suddenly increases, the main valve core will move further along the movement direction of the pilot valve, thereby increasing the flow area between the main valve core and the valve sleeve and increasing the output oil flow, thereby exceeding the design flow range of the solenoid proportional valve, causing the actuator to over-adjust and possibly causing damage to the terminal equipment or triggering a safety accident, reducing the stability and reliability of the solenoid proportional valve. Utility Model Content

[0004] The utility model aims to provide an electromagnetic proportional valve to limit the flow area of ​​the electromagnetic proportional valve within a designed flow range, thereby improving the stability and reliability of the electromagnetic proportional valve.

[0005] To achieve this purpose, the technical solution adopted in this utility model is:

[0006] Solenoid proportional valve, including:

[0007] A magnetic conductive sleeve, wherein an assembly hole is formed at one axial end of the magnetic conductive sleeve;

[0008] A valve sleeve, one axial end of which is coaxially mounted in the assembly hole, and the valve sleeve is provided with a first oil port and a second oil port;

[0009] a main valve core, slidably disposed in the valve sleeve along the axial direction of the valve sleeve to connect or block the first oil port and the second oil port;

[0010] The solenoid proportional valve has a first state. In the first state, the limiter is installed in the assembly hole and can abut against the main valve core to limit the extreme position of the main valve core.

[0011] As an optional solution for the electromagnetic proportional valve, the magnetic sleeve is further provided with an installation cavity communicated with the assembly hole, and a first step surface is provided between the installation cavity and the assembly hole;

[0012] Along the axial direction of the valve sleeve, the limiting member is located between the first step surface and the valve sleeve.

[0013] As an optional solution of the electromagnetic proportional valve, the limiting member has a first hole extending through the limiting member along its axial direction, and the inner diameter of the first hole is smaller than the outer diameter of the main valve core.

[0014] As an optional solution of the electromagnetic proportional valve, the valve sleeve has a first wall opposite to the limiting member, and along the axial direction of the valve sleeve, a gap exists between the limiting member and at least one of the first step surface and the first wall.

[0015] As an optional solution of the electromagnetic proportional valve, the limit member includes a first ring body and a second ring body, the first ring body extends axially toward the first step surface, and the second ring body is extended from the inner ring of the first ring body.

[0016] As an optional solution of the electromagnetic proportional valve, the radial gap between the first ring body and the inner side wall of the assembly hole is 0.1 mm to 0.2 mm.

[0017] As an optional solution of the electromagnetic proportional valve, along the axial direction of the valve sleeve, one side of the limit member abuts against the first step surface, and the other side of the limit member abuts against the valve sleeve.

[0018] As an optional solution of the electromagnetic proportional valve, the electromagnetic proportional valve further includes:

[0019] A coil, wherein the coil is fixedly sleeved on the outer periphery of the magnetic sleeve;

[0020] A moving iron, the moving iron being movably disposed in the magnetic conductive sleeve;

[0021] a pilot valve core, one end of which is connected to the movable iron, and the other end of which is capable of abutting against the main valve core, and the pilot valve core is capable of driving the main valve core to slide to a position that blocks the first oil port and the second oil port;

[0022] An elastic member is located between the magnetic sleeve and the movable iron, and the elastic member is configured to always have a tendency to drive the movable iron to move toward the pilot valve core and enable the pilot valve core to drive the main valve core to move.

[0023] As an optional solution for the electromagnetic proportional valve, the outer wall of the main valve core is provided with an oil inlet groove connected to the second oil port. When the moving iron drives the pilot valve core to move away from the main valve core, the hydraulic oil entering the oil inlet groove through the second oil port can drive the main valve core to slide toward the position of guiding the first oil port and the second oil port.

[0024] As an optional solution of the electromagnetic proportional valve, the electromagnetic proportional valve further includes a locking ring, which is threadedly connected to the other axial end of the magnetic conductive sleeve to lock the magnetic conductive sleeve and the coil.

[0025] The beneficial effects of the utility model are:

[0026] The electromagnetic proportional valve proposed in the utility model installs a limit piece in the assembly hole of the magnetic sleeve to limit the extreme position of the main valve core sliding toward the position of the first oil port and the second oil port, thereby reducing the probability of excessive increase in the flow area between the main valve core and the valve sleeve, thereby reducing the actual flow rate output by the electromagnetic valve from exceeding the designed flow range, avoiding damage to the terminal equipment or safety accidents, and improving the stability and reliability of the electromagnetic proportional valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of the electromagnetic proportional valve provided by an embodiment of the present utility model;

[0028] Figure 2 It is a partial cross-sectional view of the electromagnetic proportional valve provided by an embodiment of the present utility model;

[0029] Figure 3 is a cross-sectional view of a valve sleeve provided by an embodiment of the present utility model;

[0030] Figure 4 It is a structural schematic diagram of the pilot valve core provided by an embodiment of the utility model.

[0031] The names and numbers of the components in the figure are as follows:

[0032] 1. Magnetic guide sleeve; 11. Mounting cavity; 12. Magnetic isolation copper; 13. Connecting piece; 14. Assembly hole; 141. First step surface; 142. Second step surface; 2. Moving iron; 21. Connecting cavity; 22. Abutment groove; 23. T-type connecting groove; 3. Limiting piece; 31. First ring body; 32. Second ring body; 320. First hole; 4. Locking ring; 5. Coil; 6. Valve sleeve; 61. First oil port; 62. Second oil port; 63. Positioning shoulder; 64. First wall; 7. Main valve core; 71. Oil inlet groove; 72. Radial oil inlet hole; 73. Axial oil inlet hole; 8. Pilot valve core; 81. T-type connecting part; 82. Main body; 821. Connecting groove; 83. Abutment part; 9. Elastic piece; 10. Oil inlet cavity. DETAILED DESCRIPTION

[0033] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of it.

[0034] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0038] When the pressure of the external environment where the solenoid proportional valve is located suddenly increases, the main valve core will move further along the movement direction of the pilot valve, thereby increasing the flow area between the main valve core and the valve sleeve and increasing the output oil flow, thereby exceeding the design flow range of the solenoid proportional valve, causing the actuator to over-adjust and possibly causing damage to the terminal equipment or triggering a safety accident, reducing the stability and reliability of the solenoid proportional valve.

[0039] like Figure 1 and Figure 2 As shown, this embodiment proposes an electromagnetic proportional valve, which includes a magnetic sleeve 1, a valve sleeve 6, a main valve core 7 and a limit member 3. An assembly hole 14 is formed at one axial end of the magnetic sleeve 1. One axial end of the valve sleeve 6 is coaxially mounted in the assembly hole 14. A first oil port 61 and a second oil port 62 are formed on the valve sleeve 6. The main valve core 7 is slidably disposed in the valve sleeve 6 along the axial direction of the valve sleeve 6 to connect or block the first oil port 61 and the second oil port 62. The electromagnetic proportional valve has a first state. In the first state, the limit member 3 is mounted in the assembly hole 14 and can abut against the main valve core 7 to limit the main valve core 7 from sliding to an extreme position toward a position connecting the first oil port 61 and the second oil port 62. By installing a stopper 3 within the assembly hole 14 of the magnetic sleeve 1 to limit the maximum sliding position of the main valve core 7 toward the position that guides the first oil port 61 and the second oil port 62, the probability of excessive increase in the flow area between the main valve core 7 and the valve sleeve 6 is reduced, thereby reducing the actual flow rate output by the solenoid valve from exceeding the designed flow range, avoiding damage to terminal equipment or safety accidents, and improving the stability and reliability of the solenoid proportional valve. It should be noted that the first state here refers to the maximum valve open state, where the main valve core 7 and the stopper 3 offset each other.

[0040] In this embodiment, the limiting member 3 is installed in the assembly hole 14 of the magnetic conductive sleeve 1 .

[0041] Specifically, the magnetic sleeve 1 further defines an installation cavity 11 in communication with the assembly hole 14. A first stepped surface 141 is defined between the installation cavity 11 and the assembly hole 14. Axially, the stopper 3 is positioned between the first stepped surface 141 and the valve sleeve 6. This prevents the stopper 3 from dislodging after assembly of the valve sleeve 6, ensuring secure installation of the stopper 3. In other embodiments, the stopper 3 may be secured to the valve sleeve 6 or the magnetic sleeve 1. This securing includes, but is not limited to, an integral structure or other connection methods, as long as it can limit the extreme position of the main valve core 7.

[0042] Furthermore, the valve sleeve 6 has a first wall 64 opposite to the stopper 3. Along the axial direction of the valve sleeve 6, a gap is formed between the stopper 3 and at least one of the first step surface 141 and the first wall 64, so that the axial position of the stopper 3 is not fixed. When the main valve core 7 collides with the stopper 3, the stopper 3 can move axially a very small distance, thereby eliminating the collision stress and achieving a good shock absorption and flow stabilization effect. In other embodiments, along the axial direction of the valve sleeve 6, one side of the stopper 3 abuts the first step surface 141, and the other side of the stopper 3 abuts the valve sleeve 6, so that the axial position of the stopper 3 is fixed and the stable installation of the stopper 3 is achieved.

[0043] like Figure 1 and Figure 2 As shown, the limiter 3 includes a first ring body 31 and a second ring body 32. The first ring body 31 extends axially toward the first step surface 141, and the second ring body 32 is extended from the inner ring of the first ring body 31. Through the above arrangement, the outer thickness of the limiter 3 is relatively large, thereby improving the structural strength of the limiter 3 and extending its service life. At the same time, it can further play a better role in shock absorption and flow stabilization. When the pressure of the external environment where the electromagnetic proportional valve is located suddenly increases, the main valve core 7 moves axially toward one end of the valve sleeve 6 and finally abuts against the second ring body 32, thereby limiting the axial movement of the main valve core 7 and avoiding excessive increase in the flow area between the main valve core 7 and the valve sleeve 6.

[0044] It should be noted that the first ring body 31 is clearance-matched with the assembly hole 14 to achieve clearance-matched between the position-limiting member 3 and the assembly hole 14, thereby facilitating the assembly and disassembly operations of the position-limiting member 3. Figure 2 As shown, the radial clearance H between the first ring body 31 and the inner wall of the assembly hole 14 is 0.1mm to 0.2mm. The radial clearance H can be 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm or 0.2mm, etc. When the radial clearance H is too small (less than 0.1mm), the difficulty of assembling the limiter 3 is increased. When the radial clearance H is too large (greater than 0.2mm), the contact surface between the first ring body 31 and the first step surface 141 is reduced, which reduces the stability of the installation of the limiter 3 in the assembly hole 14 and weakens the structural strength and pressure bearing capacity of the limiter 3.

[0045] like Figure 2 As shown, the stopper 3 has a first hole 320 extending axially therethrough. The inner diameter of the first hole 320 is smaller than the outer diameter of the main valve core 7. Specifically, the second ring body 32 is provided with the first hole 320, so that the inner diameter of the second ring body 32 is smaller than the outer diameter of the main valve core 7. This arrangement allows the main valve core 7 to abut against the second ring body 32 when it moves axially toward one end of the valve sleeve 6 to its limit position, thereby ensuring that the stopper 3 effectively limits the axial position of the main valve core 7.

[0046] like Figure 1 and Figure 2As shown, one end of the valve sleeve 6 is spaced apart from the limit member 3 to prevent the limit member 3 from interfering with the assembly of the valve sleeve 6. Specifically, the valve sleeve 6 is provided with a positioning shoulder 63 along the circumference, and the positioning shoulder 63 has a positioning end face extending radially along the valve sleeve 6. A second step surface 142 is provided on the inner side wall of the assembly hole 14. One end of the valve sleeve 6 is threadedly installed in the assembly hole 14. After the valve sleeve 6 is axially screwed into the assembly hole 14, when the positioning end face is in contact with and abuts the second step face 142, the valve sleeve 6 is installed in place to achieve the positioning installation of the valve sleeve 6 on the magnetic sleeve 1. At the same time, the cooperation between the positioning end face and the second step face 142 improves the coaxiality of the valve sleeve 6 and the magnetic sleeve 1 during assembly, prevents the valve sleeve 6 from getting stuck in the assembly hole 14 during the screwing process, and improves the assembly efficiency of the valve sleeve 6 and the magnetic sleeve 1.

[0047] like Figure 1 and Figure 2 As shown, the electromagnetic proportional valve also includes a coil 5, a movable iron 2, a pilot valve core 8 and an elastic member 9. The coil 5 is fixedly sleeved on the outer periphery of the magnetic sleeve 1. The movable iron 2 is movably inserted into the magnetic sleeve 1. One end of the pilot valve core 8 is connected to the movable iron 2, and the other end of the pilot valve core 8 can abut against the main valve core 7. The pilot valve core 8 can drive the main valve core 7 to slide to a position that separates the first oil port 61 and the second oil port 62. The elastic member 9 is located between the magnetic sleeve 1 and the movable iron 2. The elastic member 9 is configured to always have a tendency to drive the movable iron 2 toward the pilot valve core 8 and cause the pilot valve core 8 to drive the main valve core 7 to move. When the coil 5 does not generate a magnetic field, no electromagnetic force is generated. Under the action of the elastic member 9, the moving iron 2 moves toward the pilot valve core 8 and drives the pilot valve core 8 to drive the main valve core 7 to move to a position that separates the first oil port 61 and the second oil port 62; when the magnetic induction intensity of the magnetic field generated by the coil 5 becomes larger and larger, a certain electromagnetic force is generated, causing the moving iron 2 to pull the pilot valve core 8 to slide in a direction away from the main valve core 7. At this time, the elastic member 9 is compressed until the electromagnetic force is balanced with the elastic force of the elastic member 9, and when the moving iron 2 pulls the pilot valve core 8 to slide in a direction away from the main valve core 7, the main valve core 7 is no longer subject to the pressure driving force of the pilot valve core 8. Under the action of the hydraulic oil, the main valve core 7 can slide with the pilot valve core 8, causing the main valve core 7 to move to a position that connects the first oil port 61 and the second oil port 62, so that the hydraulic oil can output a corresponding flow from the second oil port 62 to the first oil port 61, thereby adjusting the speed of the actuator.

[0048] Optionally, the elastic member 9 of this embodiment is a spring. Optionally, a connecting member 13 is connected to the bottom wall of the installation cavity 11, and an abutment groove 22 is defined on the side of the movable iron 2 facing the connecting member 13. One end of the elastic member 9 is sleeved on the connecting member 13, and the other end of the elastic member 9 is located in the abutment groove 22.

[0049] like Figure 1As shown, the electromagnetic proportional valve also includes a lock ring 4, which is threadedly connected to the other axial end of the magnetic sleeve 1 to lock the magnetic sleeve 1 and the coil 5. The lock ring 4 is screwed onto the end of the magnetic sleeve 1 that extends outward from the coil 5. The lock ring 4 abuts against one end of the coil 5, and the other end of the coil 5 abuts against the limiting shoulder of the magnetic sleeve 1, thereby ensuring the stability of the coil 5 mounted on the magnetic sleeve 1. In addition, the end of the magnetic sleeve 1 that extends outward from the coil 5 (i.e., the end where the magnetic sleeve 1 is connected to the valve sleeve 6) is provided with an external thread, and the end of the magnetic sleeve 1 that extends outward from the coil 5 can be connected to the relevant valve group structure through the external thread.

[0050] It should be noted that the magnetic sleeve 1 is provided with a magnetic isolation copper 12. By providing the magnetic isolation copper 12 on the magnetic sleeve 1, the magnetic sleeve 1 can reasonably distribute the magnetic induction intensity in the axial and radial directions of the magnetic sleeve 1, ensuring that the electromagnetic force generated within the working stroke does not change with the position of the moving iron 2.

[0051] like Figure 1 and Figure 2 As shown, the outer wall of the main valve core 7 is provided with an oil inlet groove 71 connected to the second oil port 62. When the moving iron 2 drives the pilot valve core 8 to move away from the main valve core 7, the hydraulic oil entering the oil inlet groove 71 through the second oil port 62 can drive the main valve core 7 to slide toward the position of the first oil port 61 and the second oil port 62.

[0052] In this embodiment, if Figure 1 and Figure 2 As shown, a connecting cavity 21 is provided in the movable iron 2, which extends through the movable iron 2 in the axial direction. The connecting cavity 21 is connected to the mounting cavity 11. An oil inlet cavity 10 is formed between the pilot valve core 8 and the main valve core 7. The oil inlet cavity 10 is connected to the connecting cavity 21, and the oil inlet cavity 10 is connected to the second oil port 62. The above arrangement enables the mounting cavity 11, the connecting cavity 21 and the oil inlet cavity 10 to be connected to each other, and the hydraulic oil can flow into the mounting cavity 11, the connecting cavity 21 and the oil inlet cavity 10 through the second oil port 62. In addition, the above arrangement enables the connecting cavity 21 to connect the mounting cavity 11 and the oil inlet cavity 10 on both sides of the axial direction, thereby ensuring the reliability of the movement of the movable iron 2. In this embodiment, the connecting cavity 21 is connected to the abutment groove 22.

[0053] In this embodiment, if Figure 2 and Figure 3As shown, the outer peripheral wall of the main valve core 7 is provided with a radial oil inlet hole 72, which connects the second oil port 62 and the oil inlet chamber 10. The end of the main valve core 7 is provided with an axial oil inlet hole 73, which can connect the first oil port 61 and the oil inlet chamber 10. When the other end of the pilot valve core 8 abuts against the main valve core 7, the other end of the pilot valve core 8 blocks the axial oil inlet hole 73. When the coil 5 does not generate a magnetic field, the other end of the pilot valve core 8 blocks the axial oil inlet hole 73. At this time, only the hydraulic oil at the first oil port 61 enters the oil inlet chamber 10 through the radial oil inlet hole 72, ensuring the sealing effect between the first oil port 61 and the second oil port 62. It should be noted that in this embodiment, the bottom wall of the oil inlet groove 71 is provided with a radial oil inlet hole 72.

[0054] In this embodiment, if Figure 2 and Figure 4 As shown, the pilot valve core 8 includes a T-shaped connecting portion 81, a main body 82, and an abutting portion 83 connected in sequence along its axial direction. A T-shaped connecting groove 23 communicating with the communication chamber 21 is provided on the side of the movable iron 2 facing the pilot valve core 8. The T-shaped connecting portion 81 is connected to the T-shaped connecting groove 23, and the abutting portion 83 can abut against the end face of the main valve core 7. Optionally, in this embodiment, the T-shaped connecting portion 81 and the T-shaped connecting groove 23 are clearance-matched. The outer diameter of the main body 82 is larger than the outer diameters of the T-shaped connecting portion 81 and the abutting portion 83. A connecting groove 821 extending along its axial direction is formed on the outer peripheral wall of the main body 82, thereby creating a radial gap between the main body 82 and the main valve core 7. Moreover, due to the clearance fit between the T-shaped connecting portion 81 and the T-shaped connecting groove 23, a gap is formed between the T-shaped connecting portion 81 and the T-shaped connecting groove 23, thereby ensuring communication between the communication chamber 21 and the oil inlet chamber 10.

[0055] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications are possible without departing from the spirit and scope of the present invention. Such changes and modifications are within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. Solenoid proportional valve, characterized in that, include: A magnetic conductive sleeve (1), wherein an assembly hole (14) is provided at one axial end of the magnetic conductive sleeve (1); A valve sleeve (6), one axial end of the valve sleeve (6) is coaxially mounted in the assembly hole (14), and a first oil port (61) and a second oil port (62) are formed on the valve sleeve (6); A main valve core (7) is slidably disposed in the valve sleeve (6) along the axial direction of the valve sleeve (6) to connect or block the first oil port (61) and the second oil port (62); A limit member (3), the electromagnetic proportional valve has a first state, in which the limit member (3) is installed in the assembly hole (14) and can abut against the main valve core (7) to limit the extreme position of the main valve core (7).

2. The electromagnetic proportional valve according to claim 1, characterized in that: The magnetic conductive sleeve (1) is further provided with an installation cavity (11) in communication with the assembly hole (14), and a first step surface (141) is provided between the installation cavity (11) and the assembly hole (14); Along the axial direction of the valve sleeve (6), the limiting member (3) is located between the first step surface (141) and the valve sleeve (6).

3. The electromagnetic proportional valve according to claim 2, characterized in that: The limiting member (3) has a first hole (320) extending through the limiting member along its axial direction, and the inner diameter of the first hole (320) is smaller than the outer diameter of the main valve core (7).

4. The electromagnetic proportional valve according to claim 2, characterized in that: The valve sleeve (6) has a first wall (64) opposite to the limiting member (3), and along the axial direction of the valve sleeve (6), a gap exists between the limiting member (3) and at least one of the first step surface (141) and the first wall (64).

5. The electromagnetic proportional valve according to claim 4, characterized in that: The limiting member (3) comprises a first ring body (31) and a second ring body (32); the first ring body (31) extends axially toward the first step surface (141); and the second ring body (32) is extended from the inner ring of the first ring body (31).

6. The electromagnetic proportional valve according to claim 5, characterized in that: The radial clearance between the first ring body (31) and the inner side wall of the assembly hole (14) is 0.1 mm to 0.2 mm.

7. The electromagnetic proportional valve according to claim 2, characterized in that: Along the axial direction of the valve sleeve (6), one side of the limiting member (3) abuts against the first step surface (141), and the other side of the limiting member (3) abuts against the valve sleeve (6).

8. The electromagnetic proportional valve according to any one of claims 1 to 7, characterized in that: The electromagnetic proportional valve further comprises: A coil (5), wherein the coil (5) is fixedly sleeved on the outer periphery of the magnetic conductive sleeve (1); A moving iron (2), the moving iron (2) being movably arranged in the magnetic conductive sleeve (1); a pilot valve core (8), one end of the pilot valve core (8) being connected to the movable iron (2), the other end of the pilot valve core (8) being capable of abutting against the main valve core (7), and the pilot valve core (8) being capable of driving the main valve core (7) to slide to a position that blocks the first oil port (61) and the second oil port (62); An elastic member (9), the elastic member (9) is located between the magnetic sleeve (1) and the movable iron (2), and the elastic member (9) is configured to always have a tendency to drive the movable iron (2) toward the pilot valve core (8) and enable the pilot valve core (8) to drive the main valve core (7) to move.

9. The electromagnetic proportional valve according to claim 8, characterized in that: An oil inlet groove (71) communicating with the second oil port (62) is provided on the outer peripheral wall of the main valve core (7). When the movable iron (2) drives the pilot valve core (8) to move in a direction away from the main valve core (7), the hydraulic oil entering the oil inlet groove (71) through the second oil port (62) can drive the main valve core (7) to slide toward a position that is connected to the first oil port (61) and the second oil port (62).

10. The electromagnetic proportional valve according to claim 8, characterized in that: The electromagnetic proportional valve further comprises a locking ring (4), wherein the locking ring (4) is threadedly connected to the other axial end of the magnetic sleeve (1) to lock the magnetic sleeve (1) and the coil (5).

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