Riveting tool for valve element of electromagnetic valve

Abstract

An electromagnetic valve element riveting tool comprises an upper die and a lower die, the upper die comprises an upper die base, a pre-pressing rod is arranged at the lower end of the upper die base, a riveting head is arranged in the pre-pressing rod, a first compression spring is arranged between the riveting head and the upper die base, the lower die comprises a lower die base, and an inner hole is formed in the center of the lower die base. A lower die cover is arranged on the end face of the upper end of the lower die base, a stepped through hole is formed in the center of the lower die cover, the lower end of the lower die cover extends into an inner hole of the lower die base to be in clearance fit with the lower die base, a rivet head is arranged in the center of the lower end of the inner hole of the lower die base, and the upper end of the rivet head extends into a through hole of the lower die cover. A second compression spring is arranged on the outer circumference of the lower end of the rivet head, a fixing plate is arranged at the upper end of the second compression spring, the upper end of the fixing plate is fixedly connected with a height limiting block, the height limiting block is arranged between the outer circumference of the upper end of the rivet head and the through hole of the lower die cover, and the stepped through hole of the lower die cover limits the height limiting block; the upper end of the rivet head penetrates through the via hole of the height limiting block and extends into the through hole of the lower die cover.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve manufacturing technology, specifically to a solenoid valve core riveting fixture. Background Technology

[0002] The existing press-fitting fixture works by using a height-limiting block 3 to precisely position the magnetic core and the magnetic core shaft 2, and directly limiting the axial dimension. The press head 1 first presses the magnetic core and the magnetic core shaft 2 together, and then the press head is replaced with a riveting head for riveting. Figure 1 As shown, the existing tooling uses an interference fit to ensure axial dimensions and riveting to increase strength. However, this solution results in varying degrees of bending of the core shaft after press-fitting due to the long interference section and large interference amount between the core and the core shaft, failing to meet product design requirements and directly affecting assembly performance. Furthermore, the core needs to be limited at the bottom surface of the inner hole of the U-shaped hole, which has a maximum diameter limitation, requiring a hole in the middle to allow space for the core shaft, resulting in limited available space.

[0003] Therefore, a tooling is needed that enables the pressed product to meet production requirements and performance. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a riveting fixture for solenoid valve cores. This riveting fixture ensures that the product meets design requirements.

[0005] The purpose of this utility model is achieved by the following solution: a solenoid valve core riveting fixture, including an upper die and a lower die, wherein the upper die includes an upper die base, a riveting head is provided in a preload rod at the lower end of the upper die base, and a first compression spring is provided between the riveting head and the upper die base; the lower die includes a lower die base, an inner hole is provided at the center of the lower die base, a lower die cover is provided on the upper end face of the lower die base, a stepped through hole is provided at the center of the lower die cover, the lower end of the lower die cover extends into the inner hole of the lower die base and is clearance-fitted with the lower die base, and a step through hole is provided at the center of the lower end of the inner hole of the lower die base. The rivet head has its upper end inserted into the through hole of the lower mold cover. A second compression spring is provided on the outer circumference of the lower end of the rivet head. A fixing plate is provided on the upper end of the second compression spring. The upper end of the fixing plate is connected and fixed to the height limiting block. The height limiting block is located between the outer circumference of the upper end of the rivet head and the through hole of the lower mold cover. The height limiting block slides with the rivet head and the lower mold cover. The stepped through hole of the lower mold cover limits the height limiting block. The upper end of the rivet head passes through the through hole of the height limiting block and extends into the through hole of the lower mold cover. The centers of the preload rod, rivet head, lower mold base, lower mold cover, rivet head and height limiting block are located on the same axis.

[0006] The rivet head has a rectangular groove in the middle section and a clearance groove in the upper section. There are three rectangular grooves and clearance grooves in total, and a fixing plate is set in the rectangular groove.

[0007] Ventilation holes are provided at the bottom center and on the side wall of the lower mold base.

[0008] The center of the rivet head is provided with a through hole axially penetrating the rivet head, and the through hole and the air permeable hole in the center of the bottom end of the lower die base are in communication with each other.

[0009] The top end of the rivet head is provided with a second rivet head, which is arranged outside the through hole of the rivet head and has a diameter smaller than the outer diameter of the rivet head.

[0010] The upper end surface of the height limiting block is axially provided with a protrusion, which is in sliding fit with the accommodation groove of the upper section of the rivet head.

[0011] The pre-pressing rod is connected and fixed with the upper die base by screws, the lower die cover is connected and fixed with the lower die base by screws, and the fixed plate is connected and fixed with the height limiting block by screws.

[0012] The centering piece for aligning the upper die and the lower die is arranged between the upper die and the lower die.

[0013] The inner hole of the pre-pressing rod is a stepped through hole, and the riveting head is a stepped head, which is installed in the stepped through hole of the pre-pressing rod.

[0014] The advantages of the utility model lie in that the problems of large deformation after assembly of the electromagnetic valve spool, small riveting surface of the magnetic core, small outer diameter of the U-shaped groove and poor shape tolerance precision after assembly are effectively solved, and the axial size and strength of the electromagnetic valve spool are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of prior art;

[0016] Figure 2 It is a structural schematic diagram of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the rivet head;

[0018] Figure 4 It is a structural schematic diagram of the lower die cover;

[0019] Figure 5 It is a structural schematic diagram of the height limiting block;

[0020] Figure 6 It is an assembly schematic diagram of the electromagnetic valve spool and the tooling;

[0021] Figure 7 It is a riveting process schematic diagram of the electromagnetic valve spool. DETAILED DESCRIPTION

[0022] As Figures 2 to 7As shown, a electromagnetic valve spool riveting tool includes an upper die and a lower die, the upper die includes an upper die base 1, a pre-pressing rod 2 is arranged at the lower end of the upper die base 1, a riveting head 3 is arranged in the pre-pressing rod 2, a first compression spring 11 is arranged between the riveting head 3 and the upper die base 1, the inner hole of the pre-pressing rod 2 is a stepped through hole, the riveting head 3 is a stepped head, and the riveting head 3 is installed in the stepped through hole of the pre-pressing rod 2. The lower die includes a lower die base 8, the center of the lower die base 8 is provided with an inner hole, the upper end surface of the lower die base 8 is provided with a lower die cover 10, the center of the lower die cover 10 is provided with a stepped through hole, the lower end of the lower die cover 10 extends into the inner hole of the lower die base 8 and is in clearance fit with the lower die base 8, a riveting head 6 is arranged at the center of the lower end of the inner hole of the lower die base 8, the upper end of the riveting head 6 extends into the through hole of the lower die cover 10, the lower end of the riveting head 6 is provided with a second compression spring 7, the upper end of the second compression spring 7 is provided with a fixed plate 5, the upper end of the fixed plate 5 is connected and fixed with a height limiting block 9, the height limiting block 9 is arranged between the upper end outer circumference of the riveting head 6 and the through hole of the lower die cover 10, the height limiting block 9 is in sliding fit with the riveting head 6 and the lower die cover 10, the stepped through hole of the lower die cover 10 limits the height limiting block 9, the upper end of the riveting head 6 extends into the through hole of the lower die cover 10 through the through hole of the height limiting block 9, the middle section of the riveting head 6 is provided with a rectangular groove 6-1, the upper section of the riveting head 6 is provided with a displacement groove 6-2, the number of the rectangular groove 2-1 and the displacement groove 6-2 is three, and the fixed plate 5 is arranged in the rectangular groove 6-1. The center of the bottom end of the lower die base 8 and the side wall are both provided with air holes. The center of the riveting head 6 is provided with a through hole penetrating the riveting head 6 in the axial direction, and the through hole and the air hole at the center of the bottom end of the lower die base 8 are in communication with each other. The top end of the riveting head 6 is provided with a second riveting head 6-3, the second riveting head 6-3 is arranged outside the through hole of the riveting head 6, and the diameter of the second riveting head 6-3 is smaller than the outer diameter of the riveting head 6. The upper end surface of the height limiting block 9 is provided with a protrusion 9-1 in the axial direction, and the protrusion 9-1 is in sliding fit with the displacement groove 6-2 of the upper section of the riveting head 6. The centers of the pre-pressing rod 2, the riveting head 3, the lower die base 8, the lower die cover 10, the riveting head 6 and the height limiting block 9 are located on the same axis. The pre-pressing rod 2 is connected and fixed with the upper die base 1 through a screw, the lower die cover 10 is connected and fixed with the lower die base 8 through a screw, and the fixed plate 5 is connected and fixed with the height limiting block 9 through a screw. A centering piece 4 for aligning the upper die and the lower die is arranged between the upper die and the lower die.

[0023] The upper die and the lower die of the riveting tool are fixed on the workbench through screws and bolts. During riveting, the upper die and the lower die are first aligned by using the centering piece, the magnetic core and the magnetic core shaft are manually fed into the lower die cover and the pre-pressing rod respectively, at this time, the magnetic core shaft is pressed onto the fixed plate, the surface of the fixed plate is attached to the bottom surface of the height limiting block, the magnetic core is attached to the top surface of the height limiting block to limit the height; the riveting head is pressed downward to press the entire magnetic core assembly and the height limiting block structure downward, finally the riveting surface of the magnetic core is in contact with the riveting head for riveting, and finally the riveting head is retracted, the magnetic core assembly is riveted and completed, and is returned to the feeding position through the second compression spring.

[0024] The riveting tool adopts a lower die cover to precisely position the magnetic core and the height limiting block, the height limiting block guarantees the height after riveting and precisely positions the riveting head, the riveting head precisely positions the magnetic core shaft, the rectangular groove in the middle of the riveting head is used to fix the height limiting block and the fixing plate, and due to the product shape, the outer diameter of the riveting head has maximum and minimum size limits, three displacement grooves are processed on the riveting head, and the height limiting position of the height limiting block is connected with the product through the three displacement grooves. The riveting head is designed to be floating, so that the position change amount of the magnetic core shaft caused by the extrusion of the magnetic core during riveting is reduced, and the axial size is guaranteed as much as possible. And it is found through verification that direct riveting can guarantee the size and strength of the magnetic core shaft assembly.

[0025] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and the changes made by the person skilled in the art without departing from the spirit of the present application fall within the protection scope of the present application.

Claims

1. An electromagnetic valve spool riveting tool, comprising an upper die and a lower die, the upper die comprising an upper die base (1), a pre-pressing rod (2) being arranged at the lower end of the upper die base (1), a riveting head (3) being arranged in the pre-pressing rod (2), a first compression spring (11) being arranged between the riveting head (3) and the upper die base (1), characterized in that: The lower die comprises a lower die base (8), the center of the lower die base (8) is provided with an inner hole, the upper end face of the lower die base (8) is provided with a lower die cover (10), the center of the lower die cover (10) is provided with a stepped through hole, the lower end of the lower die cover (10) extends into the inner hole of the lower die base (8) and is in clearance fit with the lower die base (8), the center of the lower end of the inner hole of the lower die base (8) is provided with a riveting head (6), the upper end of the riveting head (6) extends into the through hole of the lower die cover (10), the lower end of the riveting head (6) is provided with a second compression spring (7) on the outer circumference, the upper end of the second compression spring (7) is provided with a fixed plate (5), the upper end of the fixed plate (5) is connected and fixed with a height limiting block (9), the height limiting block (9) is arranged between the outer circumference of the upper end of the riveting head (6) and the through hole of the lower die cover (10), the height limiting block (9) is in sliding fit with the riveting head (6) and the lower die cover (10), the stepped through hole of the lower die cover (10) limits the height limiting block (9), the riveting head (6) extends into the through hole of the lower die cover (10) through the via hole of the height limiting block (9), and the centers of the pre-pressing rod (2), the riveting head (3), the lower die base (8), the lower die cover (10), the riveting head (6) and the height limiting block (9) are located on the same axis.

2. The electromagnetic valve spool swaging tooling of claim 1, wherein: The middle section of the riveting head (6) is provided with a rectangular groove (6-1), the upper section of the riveting head (6) is provided with a giving-up groove (6-2), the number of the rectangular groove (6-1) and the giving-up groove (6-2) is three, and the fixed plate (5) is arranged in the rectangular groove (6-1).

3. The electromagnetic valve spool swaging tool of claim 1, wherein: The center of the bottom end of the lower die base (8) and the sidewall are both provided with a ventilation hole.

4. The electromagnetic valve spool swaging tooling of claim 1, wherein: The center of the riveting head (6) is provided with a through hole penetrating the riveting head (6) in the axial direction, and the through hole and the ventilation hole at the center of the bottom end of the lower die base (8) are in communication with each other.

5. The electromagnetic valve spool swaging tooling of claim 1, wherein: The top end of the riveting head (6) is provided with a second riveting head (6-3), the second riveting head (6-3) is arranged outside the through hole of the riveting head (6), and the diameter of the second riveting head (6-3) is smaller than the outer diameter of the riveting head (6).

6. The electromagnetic valve spool swaging tool of claim 1, wherein: The upper end face of the height limiting block (9) is axially provided with a protrusion (9-1), and the protrusion (9-1) is in sliding fit with the giving-up groove (6-2) of the upper section of the riveting head (6).

7. The electromagnetic valve spool swaging tool of claim 1, wherein: The pre-pressing rod (2) is connected and fixed with the upper die base (1) through a screw, the lower die cover (10) is connected and fixed with the lower die base (8) through a screw, and the fixed plate (5) is connected and fixed with the height limiting block (9) through a screw.

8. The electromagnetic valve spool swaging tool of claim 1, wherein: A centering piece (4) for aligning the upper die and the lower die is arranged between the upper die and the lower die.

9. The electromagnetic valve spool swaging tool of claim 1, wherein: The inner hole of the pre-pressing rod (2) is a stepped through hole, the riveting head (3) is a stepped head, and the riveting head (3) is installed in the stepped through hole of the pre-pressing rod (2).

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