Method and apparatus for mounting an electromagnetic coil

Abstract

The application relates to a mounting method and device of an electromagnetic coil and relates to the field of electromagnetic coils.The mounting method comprises the following steps of S1, a clamp spring is mounted to a first guide piece, the first guide piece abuts against the electromagnetic coil, the clamp spring is moved from the first guide piece to a diameter part of the electromagnetic coil in a vertical direction from top to bottom, and a recess part of the clamp spring is clamped with a groove of the diameter part; S2, the electromagnetic coil is adsorbed to a pressure head, the pressure head drives the electromagnetic coil to move downwards, part of the electromagnetic coil and the clamp spring are inserted into an electromagnetic valve cylinder, and a clamping jaw clamps an electromagnetic valve cylinder shell; S3, the clamp spring passes through a second guide piece, the second guide piece makes a protruding part of the clamp spring be extruded, the electromagnetic coil reaches a specified position, the protruding part extends outward and is clamped with a clamping groove of the electromagnetic valve cylinder, and the recess part of the clamp spring is clamped with the electromagnetic coil; and S4, the pressure head moves upwards and resets, steps S1 to S3 are repeated, and the next clamp spring and electromagnetic coil are mounted; the problem that the electromagnetic coil is prone to falling is solved.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic coils, and in particular to a method and apparatus for installing electromagnetic coils. Background Technology

[0002] The solenoid coil is the "power source" and "control core" of a solenoid valve. Without the solenoid coil, the solenoid valve loses its electric control capability. The solenoid coil is a key component that distinguishes a solenoid valve from an ordinary mechanical valve. However, existing equipment has the problem of the solenoid coil easily falling off. Summary of the Invention

[0003] One technical problem that this invention aims to solve is to overcome the defect of electromagnetic coils in the prior art being prone to falling off, thereby providing an installation device for electromagnetic coils.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A method for installing an electromagnetic coil, comprising:

[0006] S1, the retaining ring is installed on the first guide member, the first guide member abuts against the electromagnetic coil, the retaining ring moves from top to bottom in the vertical direction from the first guide member to the diameter portion of the electromagnetic coil, and the recessed portion of the retaining ring engages with the groove of the diameter portion;

[0007] S2, the electromagnetic coil is attracted to the pressure head, the pressure head drives the electromagnetic coil to move downward, part of the electromagnetic coil is inserted into the solenoid valve, part of the electromagnetic coil and the snap ring are inserted into the solenoid valve cylinder, and the gripper holds the outer shell of the solenoid valve cylinder.

[0008] S3, the snap ring passes through a second guide member, which causes the protrusion of the snap ring to be squeezed and reach a designated position through the electromagnetic coil. The protrusion extends outward and engages with the snap-fit ​​groove of the electromagnetic valve cylinder. The recess of the snap ring engages with the electromagnetic wire.

[0009] S4, the pressure head moves upward and resets, and steps S1 to S3 are repeated to install the next snap ring and the next electromagnetic coil.

[0010] Preferably, in step S1, the retaining ring is first secured to the small diameter end of the first guide member, and the retaining ring is moved toward the large diameter end of the first guide member until the retaining ring moves onto the electromagnetic coil.

[0011] Preferably, in step S1, the protrusion protrudes from the diameter portion along the radial direction of the diameter portion; in step S3, the protrusion abuts against the inner wall of the solenoid valve cylinder, and the inner wall of the solenoid valve cylinder presses the protrusion inward.

[0012] Preferably, in step S2, after the electromagnetic coil is attracted to the pressure head, the second guide is fixed to the electromagnetic valve cylinder, with the large diameter portion of the tapered hole of the second guide facing upward and the small diameter portion of the tapered hole of the second guide facing downward.

[0013] Preferably, during the downward movement of the electromagnetic coil and the retaining ring, the conical surface of the second guide member presses inward against the protrusion.

[0014] Preferably, in step S4, if the electromagnetic coil is on the pressure head when the pressure head moves upward, the installation of the electromagnetic coil fails. The electromagnetic coil is then removed from the pressure head, the snap ring is removed from the electromagnetic coil, and a new snap ring is used. Steps S1 to S3 are then repeated.

[0015] An installation device for an electromagnetic coil, comprising:

[0016] The press-fit assembly includes a support frame, a drive component, a press head, and a retaining ring. The drive component is fixed to the support frame and can drive the press head to move vertically. The retaining ring includes multiple recesses and protrusions, with each recess and protrusion connected sequentially end to end. Each recess or protrusion has a notch. The distance between the recess and the center of the retaining ring is less than the distance between the protrusion and the center of the retaining ring. The recess engages with a groove in the diameter portion of the electromagnetic coil, and the protrusion protrudes from the diameter portion along its radial direction.

[0017] The positioning assembly includes a positioning frame and a snap-fit ​​component. The solenoid valve cylinder is placed on the positioning frame, and the snap-fit ​​component snaps into the solenoid valve cylinder. The solenoid valve cylinder is located directly below the pressure head.

[0018] Preferably, the second guide member includes a large-diameter portion and a small-diameter portion, the large-diameter portion being connected to the solenoid valve, the pressure head driving the solenoid coil to move downwards, and the small-diameter portion passing through the solenoid coil.

[0019] Preferably, the smaller diameter portion is provided with a tapered hole, and the diameter of the tapered hole gradually decreases near one end of the larger diameter portion.

[0020] Preferably, the snap ring is engaged with the first guide member, and the diameter of the first guide member gradually increases or decreases along the vertical direction.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] The above-mentioned technical solution provides a method for installing an electromagnetic coil. First, a retaining ring is installed onto a first guide member, which abuts against the electromagnetic coil. The retaining ring moves vertically from top to bottom from the first guide member onto the diameter portion of the electromagnetic coil, and the recessed portion of the retaining ring engages with the groove in the diameter portion. This process replaces the traditional manual installation method of the retaining ring, avoiding damage to the retaining ring due to excessive manual pulling force. Second, the electromagnetic coil is attracted to a pressure head, which moves the electromagnetic coil downwards. Part of the electromagnetic coil is inserted into the solenoid valve, and the remaining portion... The process involves inserting a retaining ring into the solenoid valve cylinder, with the grippers holding the solenoid valve cylinder housing to prevent slight shaking of the solenoid valve and cylinder during press-fitting; the third step involves pressing the protruding part of the retaining ring inward, moving the solenoid coil to the designated position, extending the protruding part outward and engaging with the locking groove of the solenoid valve cylinder, and engaging the recessed part of the retaining ring with the solenoid wire. This design allows the solenoid coil to be installed as a whole with the solenoid valve through the retaining ring, solving the problem of the solenoid coil easily falling off; the fourth step involves moving the press head upward and resetting it, repeating steps S1 to S3 to install the next retaining ring and solenoid coil. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a partial schematic diagram of the mounting device for the electromagnetic coil provided in an embodiment of the present invention;

[0025] Figure 2 This is an exploded view of the electromagnetic coil mounting device provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of an electromagnetic coil provided in an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the first guide member provided in an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the second guide member provided in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of a retaining ring provided in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the snap-fit ​​component provided in an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the pressure head provided in an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of some of the grippers provided in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Press-fit assembly; 11. Support frame; 12. Drive component; 13. Press head; 14. Snap ring; 141. Recess; 142. Protrusion; 2. Positioning assembly; 21. Positioning frame; 22. Snap-fit ​​component; 3. First guide component; 31. Small diameter end; 32. Large diameter end; 4. Second guide component; 41. Large diameter part; 42. Small diameter part; 421. Tapered hole; 5. Electromagnetic coil; 51. Groove; 6. Electromagnetic valve; 7. Electromagnetic valve cylinder; 71. Snap-fit ​​groove; 8. Gripper. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Please refer to the following carefully. Figures 1 to 8This invention provides an installation device for an electromagnetic coil, comprising: a pressing assembly 1, a positioning assembly 2, and a worktable. Specifically, the pressing assembly 1 includes a support frame 11, a driving component 12, a pressing head 13, and a retaining ring 14. The support frame 11 is fixed to the worktable, and the driving component 12 is fixed to the support frame 11. The driving component 12 can be a cylinder. The output end of the driving component 12 is connected to a connecting rod, and the other end of the connecting rod is connected to the pressing head 13. The driving component 12 can drive the pressing head 13 to move vertically. The bottom of the pressing head 13 is provided with multiple vacuum suction ports. The vacuum suction ports of the pressing head 13 adsorb the electromagnetic coil 5. The outer shell of the electromagnetic coil 5 is provided with a diameter portion. During the process of installing the retaining ring 14 onto the electromagnetic coil 5, the recessed portion 141 of the retaining ring 14 engages with the diameter groove 51, and the retaining ring 14 is successfully installed onto the electromagnetic coil 5. The positioning assembly 2 includes a positioning frame 21 and a snap-fit ​​component 22. The solenoid valve cylinder 7 is placed on the positioning frame 21 and is located directly below the pressure head 13. The snap-fit ​​component 22 is fixed to the worktable. The snap-fit ​​portion of the snap-fit ​​component 22 is U-shaped and snaps into the solenoid valve cylinder 7. The snap-fit ​​component 22 can play a limiting role, making the solenoid valve 6 and the solenoid coil 5 coaxially arranged. In addition, the positioning assembly 2 may also include a clamping component, which clamps the solenoid valve cylinder 7 and plays a limiting role in the solenoid valve cylinder 7.

[0039] It is conceivable that the first guide member 3 can be set as conical or cylindrical, and the retaining ring 14 is installed onto the electromagnetic coil 5 through the first guide member 3. First, the electromagnetic coil 5 is reversed, and the retaining ring 14 is first snapped into the small diameter end 31 of the first guide member 3; then, the first guide member 3 is connected to the electromagnetic coil 5, and the retaining ring 14 is pressed vertically from top to bottom onto the outer shell of the electromagnetic coil 5, that is, the retaining ring 14 is moved towards the large diameter end 32 of the first guide member 3 until the retaining ring 14 is moved onto the outer shell of the electromagnetic coil 5. In this process, the step of manually opening and installing the retaining ring 14 onto the outer shell of the electromagnetic coil 5 is replaced, and the retaining ring 14 remains within its elastic limit during the movement along the first guide member 3. During the manual installation of the retaining ring 14, excessive tension on the retaining ring 14 may cause damage to the retaining ring 14. The design of the first guide member 3 avoids this situation.

[0040] It is conceivable that after the snap ring 14 is installed on the solenoid coil 5, the next step can have two options. The first option: A second guide member 4 needs to be installed on the solenoid valve 6 seat. The second guide member 4 can be frustum-shaped, including a large-diameter portion 41 and a small-diameter portion 42. The large-diameter portion 41 of the tapered hole 421 of the second guide member 4 faces upwards, and the small-diameter portion 42 of the tapered hole 421 faces downwards. Vertically, the internal diameter of the second guide member 4 gradually increases or decreases. The outer side of the large-diameter portion 41 abuts against the inner side of the solenoid valve 6. The pressure head 13 drives the solenoid coil 5 downwards. The small-diameter portion 42 of the second guide member 4 passes through the solenoid coil 5, partially inserting the solenoid coil 5 into the solenoid valve 6, and partially inserting the solenoid coil 5 and the snap ring 14 into the solenoid valve cylinder 7. The second guide member 4 presses inwards against the protrusion of the snap ring 14. 142. The electromagnetic coil 5 moves to the designated position, the protrusion 142 extends outward and engages with the locking groove 71 of the electromagnetic valve cylinder 7, and the electromagnetic coil 5 is successfully installed as an integral part of the electromagnetic valve 6 through the retaining ring 14; Second scheme: In the vertical direction, the projection of the pressure head 13 at least partially overlaps with the projection of the electromagnetic valve 6. The pressure head 13 drives the electromagnetic coil 5 to move downward, and part of the electromagnetic coil 5 and the retaining ring 14 are inserted into the electromagnetic valve cylinder 7. The protrusion 142 of the retaining ring 14 abuts against the inner wall of the electromagnetic valve cylinder 7. The inner wall of the electromagnetic valve cylinder 7 presses against the protrusion 142 of the retaining ring 14, and the electromagnetic coil 5 moves downward to the designated position. The protrusion 142 of the retaining ring 14 extends outward and engages with the locking groove 71 of the electromagnetic valve cylinder 7. The first scheme requires the use of the second guide member 4, which plays a guiding and installation role. The second scheme does not require the use of the second guide member 4, and directly presses the protrusion 142 of the retaining ring 14 through the inner side of the electromagnetic valve cylinder 7.

[0041] It is conceivable that the retaining ring 14 includes multiple recesses 141 and protrusions 142, with each recess 141 and protrusion 142 connected end to end in sequence. Each recess 141 or protrusion 142 has a notch. The distance between the center of the recess 141 and the center of the retaining ring 14 is less than the distance between the center of the protrusion 142 and the center of the retaining ring 14. The retaining ring 14 is mounted on the electromagnetic coil 5. The recess 141 of the retaining ring 14 engages with the groove 51 of the diameter portion of the electromagnetic coil 5. The pressure head 13 drives the electromagnetic coil 5 downwards. Along the radial direction of the diameter portion, the protrusion 142 of the retaining ring 14 protrudes from the diameter portion. The electromagnetic coil 5 is inserted into the electromagnetic valve cylinder 7. The protrusion 142 of the retaining ring 14 engages with the engaging groove 71 of the electromagnetic valve 6, thus achieving the integration of the electromagnetic coil 5 and the electromagnetic valve 6 through the retaining ring 14. Furthermore, the multiple recesses 141 and protrusions 142 of the retaining ring 14 prevent the electromagnetic coil 5 from easily falling off.

[0042] It is conceivable that when the pressure head 13 moves vertically upward, the operator can directly observe whether an electromagnetic wire is attracted to the pressure head 13. If an electromagnetic coil 5 is attracted to the pressure head 13, it means that the installation of the electromagnetic coil 5 has failed, and the electromagnetic coil 5 needs to be removed from the pressure head 13. Then, the damaged retaining ring 14 needs to be removed from the electromagnetic coil 5. If no electromagnetic coil 5 is attracted to the pressure head 13, it means that the installation of the electromagnetic coil 5 has been successful. Then, the next retaining ring 14 is reinstalled on the electromagnetic coil 5, and the subsequent installation continues.

[0043] This invention provides a method for installing an electromagnetic coil; please refer to the following carefully. Figures 1 to 9 The method provided in this embodiment includes:

[0044] S1, the retaining ring 14 is installed on the first guide member 3, the first guide member 3 abuts against the electromagnetic coil 5, the retaining ring 14 moves vertically from top to bottom from the first guide member 3 to the diameter part of the electromagnetic coil 5, and the recessed part 141 of the retaining ring 14 engages with the groove 51 of the diameter part. This process replaces the traditional manual installation method of the retaining ring 14, avoiding damage to the retaining ring 14 due to excessive manual pulling force.

[0045] S2, the electromagnetic coil 5 is attracted to the pressure head 13, the pressure head 13 drives the electromagnetic coil 5 to move downward, part of the electromagnetic coil 5 is inserted into the electromagnetic valve 6, part of the electromagnetic coil 5 and the snap ring 14 are inserted into the electromagnetic valve cylinder 7, and the gripper 8 clamps the outer shell of the electromagnetic valve cylinder 7.

[0046] S3, the snap ring 14 is pressed by the second guide member 4, which causes the protrusion 142 of the snap ring 14 to reach the designated position through the electromagnetic coil 5, avoiding the influence of the pressing process on the snap ring 14. The protrusion 142 extends outward and engages with the engagement groove 71 of the electromagnetic valve cylinder 7. The recess 141 of the snap ring 14 engages with the electromagnetic coil 5. This design allows the electromagnetic coil 5 to be installed as one unit with the electromagnetic valve 6 through the snap ring 14, solving the problem that the electromagnetic coil 5 is easy to fall off.

[0047] S4, the pressure head 13 moves upward and resets, repeat steps S1 to S3, and install the next snap ring 14 and electromagnetic coil 5.

[0048] In step S1, the snap ring 14 is first snapped onto the small diameter end 31 of the first guide member 3, and the snap ring 14 is moved toward the large diameter end 32 of the first guide member 3 until the snap ring 14 moves onto the electromagnetic coil 5.

[0049] In step S1, the protrusion 142 protrudes from the diameter portion along the radial direction of the diameter portion; in step S3, the protrusion 142 abuts against the inner wall of the solenoid valve cylinder 7, and the inner wall of the solenoid valve cylinder 7 presses the protrusion 142 inward.

[0050] In step S2, after the electromagnetic coil 5 is attracted to the pressure head 13, the second guide 4 is fixed to the electromagnetic valve cylinder 7, with the large diameter portion 41 of the tapered hole 421 of the second guide 4 facing upward and the small diameter portion 42 of the tapered hole 421 of the second guide 4 facing downward.

[0051] As the electromagnetic coil 5 and the snap ring 14 move downward, the conical surface of the second guide 4 presses inward against the protrusion 142.

[0052] In step S4, when the pressure head 13 moves upward, if the pressure head 13 has an electromagnetic coil 5, the installation of the electromagnetic coil 5 fails. The electromagnetic coil 5 is removed from the pressure head 13, the snap ring 14 is removed from the electromagnetic coil 5, and a new snap ring 14 is used. Steps S1 to S3 are repeated.

[0053] Two grippers 8 are provided. When gripping the outer shell of the solenoid valve cylinder 7, the grippers 8 ensure that the solenoid coil 5 and the solenoid valve 6 are coaxially arranged. This allows the solenoid coil 5 to be installed as a whole with the solenoid valve 6 through the retaining ring 14 during the downward pressing process driven by the pressure head 13. In addition, the grippers 8 have a corrective effect on the solenoid valve cylinder 7 and the solenoid valve 6, preventing slight shaking of the solenoid valve cylinder 7 and the solenoid valve 6, thereby ensuring that the solenoid valve 6 and the solenoid coil 5 are coaxially arranged, and increasing the probability of successful installation of the solenoid coil 5 and the solenoid valve 6.

[0054] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A method of installing an electromagnetic coil, characterized by, Comprising: S1, the snap spring (14) is installed to the first guide (3), the first guide (3) is in abutment with the electromagnetic coil (5), the snap spring (14) is moved from the first guide (3) to the diameter part of the electromagnetic coil (5) in the vertical direction from top to bottom, and the recess part (141) of the snap spring (14) is clamped with the recess (51) of the diameter part; S2, the electromagnetic coil (5) is adsorbed to the pressure head (13), the pressure head (13) drives the electromagnetic coil (5) to move downward, part of the electromagnetic coil (5) is inserted into the electromagnetic valve (6), part of the electromagnetic coil (5) and the snap spring (14) are inserted into the electromagnetic valve cylinder (7), and the clamping jaw (8) clamps the shell of the electromagnetic valve cylinder (7); S3, the snap spring (14) passes through the second guide (4), the second guide (4) makes the protruding part (142) of the snap spring (14) be extruded, the snap spring (14) reaches the designated position through the electromagnetic coil (5), the protruding part (142) extends outward and is clamped with the clamping groove (71) of the electromagnetic valve cylinder (7), and the recess part (141) of the snap spring (14) is clamped with the electromagnetic coil (5); S4, the pressure head (13) moves upward and resets, and steps S1 to S3 are repeated to install the next snap spring (14) and electromagnetic coil (5).

2. The method of installing an electromagnetic coil according to claim 1, wherein In step S1, the snap spring (14) is clamped on the small diameter end (31) of the first guide (3), the snap spring (14) is driven to move toward the large diameter end (32) of the first guide (3), and the snap spring (14) moves to the electromagnetic coil (5).

3. The method of installing an electromagnetic coil according to claim 1, wherein In step S1, along the radial direction of the diameter part, the protruding part (142) of the snap spring (14) protrudes from the diameter part; in step S3, the protruding part (142) is in abutment with the inner wall of the electromagnetic valve cylinder (7), and the inner wall of the electromagnetic valve cylinder (7) extrudes the protruding part (142) inward.

4. The method of installing an electromagnetic coil according to claim 1, wherein In step S2, after the electromagnetic coil (5) is adsorbed to the pressure head (13), the second guide (4) is fixed with the electromagnetic valve cylinder (7), the large diameter part (41) of the tapered hole (421) of the second guide (4) faces upward, and the small diameter part (42) of the tapered hole (421) of the second guide (4) faces downward.

5. The method of installing an electromagnetic coil according to claim 4, wherein During the downward movement of the electromagnetic coil (5) and the snap spring (14), the tapered surface of the second guide (4) extrudes the protruding part (142) inward.

6. The method of installing an electromagnetic coil according to claim 1, wherein In step S4, when the pressure head (13) moves upward, if the electromagnetic coil (5) is on the pressure head (13), the electromagnetic coil (5) fails to be installed, the electromagnetic coil (5) is removed from the pressure head (13), the snap spring (14) is removed from the electromagnetic coil (5), a new snap spring (14) is used, and steps S1 to S3 are repeated.

7. An installation device of an electromagnetic coil for the installation method of the electromagnetic coil according to any one of claims 1 to 6, characterized by, Comprising: The press-fit assembly (1) comprises a support frame (11), a driving member (12), a press head (13) and a circlip (14). The driving member (12) is fixed to the support frame (11), and the driving member (12) can drive the press head (13) to move in a vertical direction. The circlip (14) comprises a plurality of recesses (141) and protrusions (142). Each of the recesses (141) and the protrusions (142) are sequentially connected end to end, and the recesses (141) or the protrusions (142) are provided with notches. The distance between the recess (141) and the center of the circlip (14) is smaller than the distance between the protrusion (142) and the center of the circlip (14). The recess (141) is clamped with a groove (51) of a diameter part of an electromagnetic coil (5), and the protrusion (142) protrudes from the diameter part in a radial direction of the diameter part. The positioning assembly (2) comprises a positioning frame (21) and a clamping member (22). An electromagnetic valve cylinder (7) is placed on the positioning frame (21), and the clamping member (22) is clamped with the electromagnetic valve cylinder (7). The electromagnetic valve cylinder (7) is located at the lower side of the press head (13).

8. The mounting arrangement for an electromagnetic coil according to claim 7, characterized in that The second guide member (4) comprises a large-diameter part (41) and a small-diameter part (42). The large-diameter part (41) is connected with the electromagnetic valve (6). The press head (13) drives the electromagnetic coil (5) to move downward. The small-diameter part (42) passes through the electromagnetic coil (5).

9. The mounting arrangement for an electromagnetic coil according to claim 8, characterized in that The small-diameter part (42) is provided with a tapered hole (421) near one end of the large-diameter part (41). The diameter of the tapered hole (421) gradually decreases.

10. The mounting device for an electromagnetic coil according to claim 7, wherein The circlip (14) is clamped in the first guide member (3). In a vertical direction, the diameter of the first guide member (3) gradually increases or decreases.

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