Electromagnetic hydraulic valve with improved structure

Abstract

The invention provides an electromagnetic hydraulic valve with an improved structure. The electromagnetic hydraulic valve solves the problem that an existing hydraulic valve is touched by mistake. The electromagnetic hydraulic valve of the improved structure comprises a static iron core and a guide rod arranged in the static iron core, a pressing cap is fixed outside the upper end of the static iron core, the upper end of the guide rod penetrates through the pressing cap, the lower end of the guide rod is supported by a first spring arranged in the static iron core, a supporting sleeve is vertically fixed on the top wall of the pressing cap, and the guide rod is sleeved with the supporting sleeve; a pushing cylinder vertically slides in the supporting sleeve, the top of the pushing cylinder is closed, the pushing cylinder is arranged outside the upper end of the guide rod in a sleeving mode, and a linkage structure enabling the pushing cylinder to drive the guide rod to move downwards is arranged between the pushing cylinder and the guide rod. A limiting structure used for limiting the upward moving distance of the pushing cylinder is arranged in the upper end of the supporting sleeve, a guide hole penetrates through the side wall of the lower end of the supporting sleeve in the radial direction, an L-shaped sliding rod is arranged on the outer side of the supporting sleeve and composed of a vertical holding rod and a horizontal limiting rod, one end of the limiting rod penetrates through the guide hole and is located under the pushing cylinder, and the other end of the limiting rod is sleeved with a second spring. The invention can prevent mistaken touch.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to an electromagnetic hydraulic valve, in particular to an electromagnetic hydraulic valve with an improved structure. Background Art

[0002] The hydraulic solenoid valve is a key control component in the hydraulic system. It drives the valve core to move through electromagnetic force to control the direction, pressure or flow of the hydraulic oil circuit.

[0003] The structure of an existing hydraulic solenoid valve is disclosed in the Chinese Patent Library as a mining hydraulic solenoid valve (Application No.: 201410627995.4), which includes a solenoid valve housing, a first push rod and a second push rod arranged in parallel, a first lifting mechanism for controlling the lifting and lowering of the first push rod, a second lifting mechanism for controlling the lifting and lowering of the second push rod, a first pressure rod, a second pressure rod, a first valve core, a second valve core, a first opening member located within the first valve core, and a second opening member located within the second valve core. The structure is characterized in that a first end of the first pressure rod is movably connected to the solenoid valve housing, the first pressure rod is transmission-connected to the first opening member, a second end of the first pressure rod corresponds to the second push rod, and the first opening member and the second push rod are respectively located on either side of the first pressure rod; a first end of the second pressure rod is movably connected to the solenoid valve housing, the second pressure rod is transmission-connected to the second opening member, a second end of the second pressure rod corresponds to the first push rod, and the second opening member and the first push rod are respectively located on either side of the second pressure rod; and the valve further includes a first stroke sensing device for detecting whether the first push rod has moved to a first predetermined position, and a second stroke sensing device for detecting whether the second push rod has moved to a second predetermined position.

[0004] In the above-mentioned hydraulic solenoid valve, the solenoid valve can be manually operated by pressing the first push rod or the second push rod, but only a manual button (actually a rubber cover) is provided above the first push rod and the second push rod, which cannot prevent some sudden collisions from causing the push rod to be accidentally pressed, affecting the normal operation of the solenoid valve. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and to propose an electromagnetic hydraulic valve with an improved structure that can prevent misoperation.

[0006] The purpose of the present invention can be achieved through the following technical solutions: an electromagnetic hydraulic valve with an improved structure, including an electromagnetic component, the electromagnetic component including a cylindrical shell and an iron core assembly and a coil both arranged in the shell, the iron core assembly including a cylindrical static iron core and a guide rod sliding up and down in the static iron core, a pressure cap fixed on the upper end of the static iron core, and the shell is clamped and positioned between the static iron core and the pressure cap, the upper end of the guide rod passes through the pressure cap, and the lower end of the guide rod is supported by a spring arranged in the static iron core, and is characterized in that a support sleeve is vertically fixed on the top wall of the pressure cap, and the support sleeve is sleeved outside the guide rod; A pushing cylinder slides vertically in the support sleeve, the top of the pushing cylinder is closed, the pushing cylinder is sleeved outside the upper end of the guide rod, and a linkage structure is provided between the pushing cylinder and the guide rod to enable the pushing cylinder to drive the guide rod to move downward; a limiting structure is provided in the upper end of the support sleeve for limiting the upward movement distance of the pushing cylinder, a guide hole is radially penetrated on the side wall of the lower end of the support sleeve, and an L-shaped sliding rod is provided on the outside of the support sleeve, the sliding rod consists of a vertically arranged holding rod and a horizontally arranged limiting rod, and one end of the limiting rod passes through the guide hole and is directly below the pushing cylinder, and the other end of the limiting rod is sleeved with a spring 2 which makes the limiting rod have a tendency to move in the direction of the guide rod.

[0007] In the initial state, under the action of spring 2, one end of the limit rod is directly below the push cylinder to prevent the push cylinder from moving downward, thereby effectively avoiding the guide rod from moving downward due to accidental contact with the push cylinder, and effectively avoiding erroneous operation.

[0008] When the guide rod needs to be manually operated, the gripping rod is pulled to make the limit rod overcome the elastic force of the second spring and retract into the guide hole to form an avoidance. At this time, the pushing cylinder drives the guide rod to move downward through the linkage structure to realize manual operation of the solenoid valve.

[0009] With the cooperation of the slide rod, spring 2, support sleeve, push cylinder and other components, protection can be formed above the guide rod, effectively preventing the guide rod from moving downward due to collision or misoperation, thereby ensuring stable operation and control of the electromagnetic hydraulic valve.

[0010] In the improved electromagnetic hydraulic valve, the limiting structure comprises an annular groove formed on the inner wall of the upper end of the support sleeve and a retaining ring disposed within the groove. The outer wall of the upper end of the push cylinder has an annular step surface, and the retaining ring presses against the step surface to limit the upward movement of the push cylinder. This design offers advantages such as a simple structure and easy installation.

[0011] In the improved electromagnetic hydraulic valve, the linkage structure includes a top wall of the pusher cylinder and a top wall of the guide rod. During operation, the pusher cylinder moves downward so that its top wall contacts the top wall of the guide rod, thereby pushing the guide rod downward together, thereby achieving manual control of the hydraulic valve. This valve has the advantages of simple structure and stable operation.

[0012] In the improved solenoid hydraulic valve, a raised ring is formed on the top wall of the pressure cap. The slide rod and support sleeve are both located within the raised ring, and the top surface of the raised ring is higher than that of the push cylinder. This design completely conceals the push cylinder outside the raised ring, further preventing accidental contact and ensuring stable operation of the solenoid valve.

[0013] In the improved electromagnetic hydraulic valve, the vertical distance between the top surface of the convex ring and the top surface of the push cylinder is 0.5 mm to 1 mm. This distance prevents collisions while not hindering manual pressing of the push cylinder, making operation easier.

[0014] In the above-mentioned improved electromagnetic hydraulic valve structure, the sliding slide rod can make the holding rod abut against the inner wall of the convex ring, and when the holding rod abuts against the inner wall of the convex ring, the position of the limit rod and the pushing cylinder are staggered, making the entire operation smoother and more convenient.

[0015] In the above-mentioned electromagnetic hydraulic valve with improved structure, a positioning block is fixed on the top wall of the pressure cap, a pressure ring is formed on the outer wall of the limit rod, and both ends of the spring act on the pressure ring and the positioning block respectively.

[0016] In the above-mentioned electromagnetic hydraulic valve with improved structure, the electromagnetic hydraulic valve also includes a valve body arranged below the electromagnetic assembly, the upper part of the valve body is a connecting seat, and the inner wall of the lower end of the shell is provided with a ring-shaped positioning seat, and the shell is pressed against the static iron core through the positioning seat, and the lower end of the static iron core is pressed against the connecting seat and the two are fixedly connected by a circle of bolts, the head of the bolt is set downward, and a positioning hole matching the bolt rod is opened on the bottom wall of the positioning seat, there is at least one positioning hole, and the upper end of the rod of at least one bolt passes through the static iron core and is inserted into one of the positioning holes.

[0017] The bolts and positioning holes cooperate to limit the outer shell in the circumferential direction, thereby preventing the outer shell from rotating when the pressure cap is screwed in, effectively avoiding subsequent resetting and adjustment steps, and making the entire assembly process smoother and more convenient.

[0018] The bolts are used to connect the electromagnetic assembly and the valve body, and also cooperate with the positioning holes to limit the housing. That is, in this application, the bolts have a dual purpose, which simplifies the structure and further facilitates assembly.

[0019] In the electromagnetic hydraulic valve with the improved structure, the number of the positioning holes and the bolts is the same and their positions correspond one to one, so as to reduce the requirements on the circumferential position of the positioning seat and make assembly more convenient.

[0020] In the improved electromagnetic hydraulic valve, the diameter of the positioning hole is slightly larger than the outer diameter of the bolt shank. The positioning hole includes two limiting surfaces circumferentially distributed along the positioning seat, with the shank of the bolt inserted into the positioning hole positioned between the two limiting surfaces. During operation, the contact between the limiting surfaces and the bolt shank restricts rotation of the housing.

[0021] During actual assembly, a slight deflection of the housing does not affect the coil output, and the aperture of the positioning hole is slightly larger than the outer diameter of the bolt rod, which makes it easier for the bolt rod to enter the positioning hole, further facilitating assembly.

[0022] In the electromagnetic hydraulic valve with the improved structure, the positioning hole is in a through-shape.

[0023] In the electromagnetic hydraulic valve with the improved structure, the positioning hole is opened on one side close to the inner hole of the positioning seat to release the stress during machining of the positioning hole and ensure the overall strength and stability of the positioning seat.

[0024] Compared with the existing technology, the electromagnetic hydraulic valve with the improved structure has the following advantages: 1. With the cooperation of the slide rod, spring 2, support sleeve, push cylinder and other components, a protection can be formed above the guide rod, effectively preventing the guide rod from moving downward due to collision or misoperation, thereby ensuring stable operation and control of the electromagnetic hydraulic valve.

[0025] 2. The bolts and positioning holes are used to limit the outer shell in the circumferential direction, thereby preventing the outer shell from rotating when the pressure cap is screwed in, effectively avoiding subsequent reset and adjustment steps, making the entire assembly process smoother and more convenient.

[0026] 3. The bolts are used to connect the electromagnetic assembly and the valve body, and cooperate with the positioning holes to limit the housing. That is, in this application, the bolts have a dual purpose, which simplifies the structure and further facilitates assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional schematic diagram of the electromagnetic hydraulic valve with the improved structure.

[0028] Figure 2 It is a cross-sectional schematic diagram of the electromagnetic hydraulic valve with the improved structure.

[0029] Figure 3 yes Figure 2 Enlarged schematic diagram of point A in the middle.

[0030] Figure 4 It is a connection diagram of the connecting seat, static iron core and positioning seat.

[0031] Figure 5 It is a three-dimensional schematic diagram of the positioning seat.

[0032] In the figure, 1. valve body; 1a. connecting seat; 2. outer shell; 2a. positioning seat; 2b. positioning hole; 2b1. limiting surface; 3. coil; 4. static iron core; 5. bolt; 6. pressure cap; 6a. convex ring; 7. guide rod; 8. moving iron core; 9. spring 1; 10. support sleeve; 11. pushing cylinder; 12. sliding rod; 12a. holding rod; 12b. limiting rod; 13. spring 2; 14. positioning block; 15. retaining ring; 16. rubber cover. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0034] Embodiment 1: The electromagnetic hydraulic valve of the improved structure comprises a valve body 1 and an electromagnetic assembly arranged above the valve body 1. The structure inside the valve body 1 is conventional and will not be described in detail here.

[0035] Specifically, like Figure 1 、 Figure 2 and Figure 4 As shown, the upper portion of the valve body 1 is a connecting seat 1a; the electromagnetic assembly includes a cylindrical outer shell 2, an iron core assembly disposed within the outer shell 2, and a coil 3 disposed between the outer shell 2 and the iron core assembly. The iron core assembly includes a cylindrical static iron core 4, the lower end of which presses against the connecting seat 1a and the two are fixedly connected by a circle of bolts 5. A pressure cap 6 is fixed to the upper end of the static iron core 4, and an annular positioning seat 2a is provided on the inner wall of the lower end of the outer shell 2. The positioning seat 2a and the outer shell 2 are arranged coaxially, and the top wall of the outer shell 2 and the positioning seat 2a are respectively pressed against the pressure cap 6 and the static iron core 4, thereby stably positioning the outer shell 2. In actual products, the positioning seat 2a and the shell 2 are split structures, and the two can be welded, bonded or tightly fitted and fixed; the pressure cap 6 is threadedly connected to the static iron core 4; the contact between the pressure cap 6 and the shell 2, the contact between the positioning seat 2a and the static iron core 4, and the contact between the static iron core 4 and the connecting seat 1a are all provided with rubber rings to achieve sealing of the above three contact positions.

[0036] The bolts 5 are positioned as follows: They are vertically arranged with their heads facing downward. A through-hole extends vertically through the connection base 1a, and corresponding threaded holes are provided in the static iron core 4. The through-holes, bolts 5, and threaded holes are identical in number and position. The shanks of the bolts 5 pass through the through-holes and screw into the corresponding threaded holes, with the heads of the bolts 5 pressing against the connection base 1a, thereby firmly connecting the static iron core 4 and the connection base 1a.

[0037] like Figure 4 and Figure 5 As shown, the bottom wall of the positioning seat 2a is provided with a positioning hole 2b that matches the shank of the bolt 5. There is at least one positioning hole 2b, and the upper end of the shank of at least one bolt 5 passes through the static iron core 4 and is inserted into one of the positioning holes 2b. The bolt 5 and the positioning hole 2b cooperate to limit the circumferential position of the housing 2, thereby preventing the housing 2 from rotating when the pressure cap 6 is screwed in. This effectively avoids the subsequent reset and adjustment steps, making the entire assembly process smoother and more convenient.

[0038] The bolt 5 is used to connect the electromagnetic assembly and the valve body 1, and cooperates with the positioning hole 2b to limit the housing 2. That is, in this application, the bolt 5 has a dual purpose, which simplifies the structure and further facilitates assembly.

[0039] Further explanation, the number of positioning holes 2b and bolts 5 is the same and the positions correspond one to one, which reduces the requirements for the circumferential position of the positioning seat 2a and makes assembly more convenient. Preferably, only one bolt 5 shank passes through the static iron core 4 and is inserted into the corresponding positioning hole 2b to facilitate design and assembly.

[0040] The diameter of positioning hole 2b is slightly larger than the outer diameter of the shank of bolt 5. Positioning hole 2b includes two limiting surfaces 2b1 distributed circumferentially along positioning seat 2a. The shank of bolt 5 inserted into positioning hole 2b is positioned between the two limiting surfaces 2b1. During use, the contact between limiting surfaces 2b1 and the shank of bolt 5 restricts rotation of housing 2.

[0041] During actual assembly, a slight deflection of the housing 2 does not affect the output of the coil 3, and the diameter of the positioning hole 2b is slightly larger than the outer diameter of the bolt 5 rod, which allows the bolt 5 rod to enter the positioning hole 2b more easily, further facilitating assembly.

[0042] Preferably, the positioning hole 2b is in a through shape, and is opened on one side close to the inner hole of the positioning seat 2a to release the stress when machining the positioning hole 2b and ensure the overall strength and stability of the positioning seat 2a.

[0043] like Figure 2 and Figure 3 As shown, the core assembly also includes a guide rod 7 that slides up and down within the static core 4 and a movable core 8 fixed to the guide rod 7. The upper end of the guide rod 7 passes through the pressure cap 6, and the lower end of the guide rod 7 is supported by a spring 9 disposed within the static core 4. The connecting seat 1a is provided with a clearance hole for the lower end of the guide rod 7 to extend into the valve body 1. A sealing ring is formed between the upper end of the guide rod 7 and the inner hole of the pressure cap 6 to cover the upper end of the pressure cap 6 and prevent dust and other impurities from entering the housing 2.

[0044] A support sleeve 10 is vertically fixed to the top wall of the pressure cap 6 and is sleeved over the guide rod 7. Preferably, the support sleeve 10 is coaxial with the pressure cap 6. In actual production, the support sleeve 10 presses against the top wall of the pressure cap 6, and a rubber ring is used to form a seal between the two. Preferably, the support sleeve 10 and the pressure cap 6 are welded together.

[0045] A push cylinder 11 slides vertically inside the support sleeve 10, and the top of the push cylinder 11 is closed and the bottom is open. The push cylinder 11 is sleeved on the outside of the upper end of the guide rod 7. The push cylinder 11 and the guide rod 7 can both slide up and down, and a linkage structure is provided between the push cylinder 11 and the guide rod 7 to enable the push cylinder 11 to drive the guide rod 7 to move downward. A limiting structure is provided inside the upper end of the support sleeve 10 to limit the upward movement distance of the push cylinder 11. A guide hole is radially penetrated on the side wall of the lower end of the support sleeve 10. An L-shaped sliding rod 12 is provided on the outside of the support sleeve 10. The sliding rod 12 is an integrated structure. The sliding rod 12 consists of a vertically arranged holding rod 12a and a horizontally arranged limiting rod 12b. One end of the limiting rod 12b passes through the guide hole and is directly below the push cylinder 11. The other end of the limiting rod 12b is sleeved with a spring 13 that causes the limiting rod 12b to have a tendency to move toward the guide rod 7.

[0046] In the initial state, under the action of spring 2 13, one end of the limit rod 12b is directly below the push cylinder 11 to prevent the push cylinder 11 from moving downward, thereby effectively avoiding the guide rod 7 from moving downward due to accidental contact with the push cylinder 11 and effectively avoiding erroneous operation.

[0047] When manual operation of the guide rod 7 is required, the gripping rod 12a is pulled to allow the limiting rod 12b to overcome the elastic force of the spring 2 13 and retract into the guide hole to form an avoidance. At this time, the pushing cylinder 11 drives the guide rod 7 to move downward together through the linkage structure to realize manual operation of the solenoid valve.

[0048] With the cooperation of the slide rod 12, spring 2 13, support sleeve 10, push cylinder 11 and other components, protection can be formed above the guide rod 7, effectively preventing collision and misoperation from causing the guide rod 7 to move downward, thereby ensuring stable operation and control of the electromagnetic hydraulic valve.

[0049] In this embodiment, The second spring 13 is installed as follows: a positioning block 14 is fixed to the top wall of the pressure cap 6, a pressure ring is formed on the outer wall of the limiting rod 12b, and the two ends of the second spring 13 act on the pressure ring and positioning block 14 respectively. To further explain, the limiting rod 12b slides with the pressure cap 6. Specifically, the positioning block 14 has a connecting hole that matches the limiting rod 12b. The connecting hole is through-shaped, and the limiting rod 12b is inserted into the connecting hole.

[0050] The limiting structure includes an annular groove on the inner wall of the upper end of the support sleeve 10 and a retaining ring 15 disposed within the groove. The groove is coaxial with the support sleeve 10. The outer wall of the upper end of the push cylinder 11 has an annular step surface coaxial with the push cylinder 11. The retaining ring 15 presses against the step surface to limit the upward movement of the push cylinder 11. This design offers advantages such as simple structure and easy installation.

[0051] The linkage structure includes a top wall of a push tube 11 and a top wall of a guide rod 7. When in use, the push tube 11 moves downward so that its top wall contacts the top wall of the guide rod 7, thereby pushing the guide rod 7 downward together to realize manual control of the hydraulic valve, which has the advantages of simple structure and stable operation.

[0052] To further illustrate, a raised ring 6a is formed on the top wall of the pressure cap 6. The slide rod 12 and support sleeve 10 are both located within the raised ring 6a, and the top surface of the raised ring 6a is positioned higher than the top surface of the push cylinder 11. This design completely conceals the push cylinder 11 from the raised ring 6a, further preventing accidental contact and ensuring stable operation of the solenoid valve. Preferably, the raised ring 6a and the pressure cap 6 are coaxially arranged. The upper end of the gripping rod 12a preferably extends beyond the raised ring 6a to further facilitate operation.

[0053] The vertical distance between the top surface of the protruding ring 6a and the top surface of the push cylinder 11 is 0.5mm to 1mm. This distance is adopted to achieve collision prevention while not hindering manual direct pressing of the push cylinder 11, thus facilitating operation. The preferred distance is 0.8mm.

[0054] During actual operation, the sliding rod 12 can make the holding rod 12a abut against the inner wall of the convex ring 6a, and when the holding rod 12a abuts against the inner wall of the convex ring 6a, the position of the limiting rod 12b and the pushing cylinder 11 are staggered, making the entire operation smoother and more convenient.

[0055] In actual products, a rubber cover 16 is provided outside the upper end of the support sleeve 10, and the upper end of the push cylinder 11 extends into the rubber cover 16. The lower end of the rubber cover 16 is fixedly connected to the outer wall of the support sleeve 10, and preferably the lower end of the rubber cover 16 and the support sleeve 10 are fixed together by a snap-fit ​​structure.

[0056] Example 2: The structure and principle of Example 2 are basically the same as those of Example 1, except that the limiting structure includes a retaining ring formed in the upper end of the support sleeve 10, and the push cylinder 11 achieves upward movement limitation by abutting against the retaining ring through its top wall.

[0057] Embodiment 3: The structure and principle of this embodiment 3 are basically the same as those of embodiment 1, except that the linkage structure includes a push ring formed on the inner wall of the push cylinder 11, and the push ring can contact the top wall of the guide rod 7.

[0058] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An improved electromagnetic hydraulic valve, comprising an electromagnetic assembly, the electromagnetic assembly comprising a cylindrical housing (2) and an iron core assembly and a coil (3) both arranged in the housing (2), the iron core assembly comprising a cylindrical static iron core (4) and a guide rod (7) arranged in the static iron core (4) for sliding up and down, a pressure cap (6) being fixed to the upper end of the static iron core (4), and the housing (2) being clamped and positioned between the static iron core (4) and the pressure cap (6), the upper end of the guide rod (7) passing through the pressure cap (6), and the lower end of the guide rod (7) being supported by a spring (9) arranged in the static iron core (4), characterized in that: A support sleeve (10) is vertically fixed on the top wall of the pressure cap (6), and the support sleeve (10) is sleeved outside the guide rod (7); a push cylinder (11) is vertically slidable in the support sleeve (10), the top of the push cylinder (11) is closed, the push cylinder (11) is sleeved outside the upper end of the guide rod (7), and a linkage structure is provided between the push cylinder (11) and the guide rod (7) to enable the push cylinder (11) to drive the guide rod (7) to move downward; a mechanism for limiting the upward movement distance of the push cylinder (11) is provided in the upper end of the support sleeve (10). The limiting structure includes a guide hole radially extending through the side wall of the lower end of the support sleeve (10), an L-shaped slide rod (12) being provided on the outer side of the support sleeve (10), the slide rod (12) being composed of a vertically arranged holding rod (12a) and a horizontally arranged limiting rod (12b), and one end of the limiting rod (12b) passing through the guide hole and being located directly below the pushing cylinder (11), and the other end of the limiting rod (12b) being sleeved with a spring (13) which enables the limiting rod (12b) to have a tendency to move in the direction of the guide rod (7).

2. The electromagnetic hydraulic valve according to claim 1, characterized in that: The above-mentioned limiting structure includes an annular groove formed on the inner wall of the upper end of the support sleeve (10) and a snap ring (15) arranged in the annular groove. The outer wall of the upper end of the push cylinder (11) has an annular step surface, and the snap ring (15) limits the upward movement of the push cylinder (11) by pressing on the annular step surface.

3. The electromagnetic hydraulic valve with improved structure according to claim 1, characterized in that: The linkage structure comprises a top wall of the pushing cylinder (11) and a top wall of the guide rod (7).

4. The electromagnetic hydraulic valve with improved structure according to claim 1, 2 or 3, characterized in that: A convex ring (6a) is formed on the top wall of the pressure cap (6), the slide rod (12) and the support sleeve (10) are both located in the convex ring (6a), and the top surface of the convex ring (6a) is higher than the top surface of the push cylinder (11).

5. The electromagnetic hydraulic valve with an improved structure according to claim 4, characterized in that: The vertical distance between the top surface of the convex ring (6a) and the top surface of the push cylinder (11) is 0.5 mm to 1 mm.

6. The electromagnetic hydraulic valve with an improved structure according to claim 4, characterized in that: The sliding rod (12) can cause the holding rod (12a) to abut against the inner wall of the convex ring (6a), and when the holding rod (12a) abuts against the inner wall of the convex ring (6a), the position of the limiting rod (12b) and the pushing cylinder (11) are staggered.

7. The electromagnetic hydraulic valve with an improved structure according to claim 1, characterized in that: The electromagnetic hydraulic valve further comprises a valve body (1) arranged below the electromagnetic assembly, the upper portion of the valve body (1) being a connecting seat (1a), an annular positioning seat (2a) being provided on the inner wall of the lower end of the shell (2), and the shell (2) being pressed against the static iron core (4) through the positioning seat (2a), the lower end of the static iron core (4) being pressed against the connecting seat (1a), and the two being fixedly connected by a circle of bolts (5), the heads of the bolts (5) being arranged downward, a positioning hole (2b) matching the rod of the bolt (5) being provided on the bottom wall of the positioning seat (2a), the number of the positioning hole (2b) being at least one, and the upper end of the rod of at least one bolt (5) passing through the static iron core (4) and inserted into one of the positioning holes (2b).

8. The electromagnetic hydraulic valve with an improved structure according to claim 7, characterized in that: The number of the positioning holes (2b) and the bolts (5) are the same and their positions correspond one to one.

9. The electromagnetic hydraulic valve with an improved structure according to claim 8, characterized in that: The diameter of the positioning hole (2b) is slightly larger than the outer diameter of the shank of the bolt (5). The positioning hole (2b) includes two limiting surfaces (2b1) distributed along the circumference of the positioning seat (2a), and the shank of the bolt (5) extending into the positioning hole (2b) is located between the two corresponding limiting surfaces (2b1).

10. The electromagnetic hydraulic valve with an improved structure according to claim 9, characterized in that: The positioning hole (2b) is in a through-shape; the positioning hole (2b) opens on one side close to the inner hole of the positioning seat (2a).

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