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] The present invention relates to the technical field of solenoid valve production, and particularly to a riveting tooling for a solenoid valve spool. Background Art

[0002] The principle of the existing press-fitting tooling is that the height-limiting block 3 precisely positions the magnetic core and the magnetic core shaft 2, and directly limits the axial dimension. The pressing head 1 first presses the magnetic core and the magnetic core shaft 2 together, and then replaces the pressing head with a riveting head for riveting. As Figure 1 shown, the existing tooling uses interference fit to ensure the axial dimension and increases the strength by riveting. However, this solution will cause the magnetic core shaft to be bent to varying degrees after press-fitting due to the relatively long interference section and large interference amount between the magnetic core and the magnetic core shaft, which does not meet the product design requirements and directly affects the performance of the assembly. Moreover, the place where the magnetic core needs to be limited is the inner bottom surface of the U-shaped hole, which has a maximum diameter limit. A hole needs to be opened in the middle to make space for the magnetic core shaft, and the available space position is small.

[0003] Therefore, a tooling that can make the press-fitted product meet the production requirements and performance is needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a riveting tooling for a solenoid valve spool in view of the deficiencies corresponding to the prior art. This riveting tooling can ensure that the product meets the design requirements.

[0005] The purpose of the present invention is achieved by the following solution: A riveting tooling for a solenoid valve spool includes an upper die and a lower die. The upper die includes 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, and a first compression spring is arranged between the riveting head and the upper die base. The lower die includes a lower die base, an inner hole is arranged at the center of the lower die base, a lower die cover is arranged on the upper end face of the lower die base, a stepped through hole is arranged 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 in clearance fit with the lower die base. A riveting head is arranged at the center of the lower end of the inner hole of the lower die base, the upper end of the riveting head extends into the through hole of the lower die cover, a second compression spring is arranged on the outer circumference of the lower end of the riveting head, a fixing plate is arranged at the upper end of the second compression spring, the upper end of the fixing plate is connected and fixed with the height-limiting block, the height-limiting block is arranged between the outer circumference of the upper end of the riveting head and the through hole of the lower die cover, the height-limiting block is in sliding fit with the riveting head and the lower die cover, the stepped through hole of the lower die cover limits the height-limiting block, the upper end of the riveting head passes through the through hole of the height-limiting block and extends into the through hole of the lower die cover. The centers of the pre-pressing rod, the riveting head, the lower die base, the lower die cover, the riveting head and the height-limiting block are located on the same axis.

[0006] A rectangular groove is arranged in the middle section of the riveting head, and a relief groove is arranged in the upper section of the riveting head. The number of the rectangular groove and the relief groove is three, and the fixing plate is arranged in the rectangular groove.

[0007] Vent holes are arranged at the center and on the side wall of the bottom end of the lower die base.

[0008] A through hole axially penetrating the riveting head is provided at the center of the riveting head, and the through hole communicates with the ventilation hole at the center of the bottom end of the lower die base.

[0009] A second riveting head is provided at the top end of the riveting head. The second riveting head is arranged outside the through hole of the riveting head, and the diameter of the second riveting head is smaller than the outer diameter of the riveting head.

[0010] A protrusion is axially provided on the upper end surface of the height limiting block, and the protrusion is in sliding fit with the relief groove on the upper section of the riveting head.

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

[0012] A centering member for aligning the upper die and the lower die is provided 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. The riveting head is installed in the stepped through hole of the pre-pressing rod.

[0014] The advantages of the present invention are that it effectively solves problems such as large deformation after the assembly of the solenoid valve spool, small riveting surface of the magnetic core, small outer diameter of the U-shaped groove, and poor geometric tolerance accuracy after assembly, and ensures the axial dimension and strength of the solenoid valve spool. Description of the Drawings

[0015] Figure 1 Schematic structural diagram of the prior art; Figure 2 Schematic structural diagram of the present invention; Figure 3 Schematic structural diagram of the riveting head; Figure 4 Schematic structural diagram of the lower die cover; Figure 5 Schematic structural diagram of the height limiting block; Figure 6 Schematic diagram of the assembly of the solenoid valve spool and the tooling; Figure 7 Schematic diagram of the riveting process of the solenoid valve spool. Detailed Embodiment

[0016] As Figures 2 to 7As shown in the figure, a riveting tooling for a solenoid valve spool 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, and 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, and the riveting head 3 is a stepped head. 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. An inner hole is arranged at the center of the lower die base 8. A lower die cover 10 is arranged on the upper end face of the lower die base 8. A stepped through hole is arranged at the center of the lower die cover 10. 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. A second compression spring 7 is arranged on the outer circumference of the lower end of the riveting head 6. A fixing plate 5 is arranged at the upper end of the second compression spring 7. The upper end of the fixing 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 upper end of the riveting head 6 passes through the through hole of the height limiting block 9 and extends into the through hole of the lower die cover 10. A rectangular groove 6-1 is arranged in the middle section of the riveting head 6, and a relief groove 6-2 is arranged in the upper section of the riveting head 6. The number of the rectangular grooves 2-1 and the relief grooves 6-2 is three. The fixing plate 5 is arranged in the rectangular groove 6-1. Vent holes are arranged at the center and on the side wall of the bottom end of the lower die base 8. A through hole axially penetrating the riveting head 6 is arranged at the center of the riveting head 6. The through hole is communicated with the vent hole at the center of the bottom end of the lower die base 8. A second riveting head 6-3 is arranged at the top end of the riveting head 6. The second riveting head 6-3 is arranged outside the through hole of the riveting head 6. The diameter of the second riveting head 6-3 is smaller than the outer diameter of the riveting head 6. A protrusion 9-1 is axially arranged on the upper end face of the height limiting block 9. The protrusion 9-1 is in sliding fit with the relief groove 6-2 in 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 by screws. The lower die cover 10 and the lower die base 8 are connected and fixed by screws. The fixing plate 5 and the height limiting block 9 are connected and fixed by screws. A centering part 4 for aligning the upper die and the lower die is arranged between the upper die and the lower die.

[0017] The upper die and the lower die of the riveting tooling are fixed on the workbench by screws and bolts. During riveting, first use the centering part to align the upper die and the lower die. Manually load the magnetic core and the magnetic core shaft into the lower die cover and the pre-pressing rod respectively. At this time, the magnetic core shaft is pressed down onto the fixing plate. The surface of the fixing plate is in contact with the bottom surface of the height limiting block, and the magnetic core is attached to the top surface of the height limiting block to limit the height. Then the riveting head presses down to press the entire magnetic core assembly and the height limiting block structure downward. Finally, the riveting surface of the magnetic core contacts the riveting head for riveting. Finally, the riveting head retracts, and the magnetic core assembly riveting is completed, and it returns to the loading position through the second compression spring.

[0018] The riveting tooling uses the lower die cover to precisely position the magnetic core and the height-limiting block. The height-limiting block ensures the height after riveting and precisely positions the riveting head. The riveting head precisely positions the magnetic core shaft. There is a rectangular groove in the middle of the riveting head for fixing the height-limiting block and the fixed plate. And due to the shape of the product, there are maximum and minimum size limits for the outer diameter of the riveting head. Three relief grooves are machined on the riveting head, and the height-limiting position of the height-limiting block is connected to the product through the three relief grooves. The riveting head adopts a floating design, which reduces the change in the position of the magnetic core shaft caused by the extrusion of the magnetic core during riveting and ensures the axial dimension as much as possible. And through verification, it is found that direct riveting can ensure the size and strength of the magnetic core shaft assembly.

[0019] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications made by those skilled in the art without departing from the spirit of the present invention fall within the protection scope of the present invention.

Claims

1. A solenoid valve core riveting tool, comprising an upper die and a lower die, wherein the upper die comprises an upper die base (1), a pre-compression rod (2) is arranged at the lower end of the upper die base (1), a riveting head (3) is arranged in the middle, and a first compression spring (11) is arranged between the riveting head (3) and the upper die base (1), characterized in that: The lower die comprises a lower die base (8), an inner hole is arranged at the center of the lower die base (8), a lower die cover (10) is arranged on the upper end surface of the lower die base (8), a stepped through hole is arranged at the center of the lower die cover (10), the lower end of the lower die cover (10) extends into the inner hole of the lower die base (8) and is clearance-matched with the lower die base (8), a rivet 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 rivet head (6) extends into the through hole of the lower die cover (10), a second compression spring (7) is arranged on the outer circumference of the lower end of the rivet head (6), and a fixing plate (7) is arranged at the upper end of the second compression spring (7) 5), the upper end of the fixing plate (5) is connected and fixed to the height limiting block (9), the height limiting block (9) is arranged between the outer circumference of the upper end of the rivet head (6) and the through hole of the lower die cover (10), the height limiting block (9) is slidably matched with the rivet 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 rivet head (6) passes through the through hole of the height limiting block (9) and extends into the through hole of the lower die cover (10), and the centers of the pre-pressing rod (2), the rivet pressing head (3), the lower die base (8), the lower die cover (10), the rivet head (6) and the height limiting block (9) are located on the same axis.

2. The solenoid valve core riveting tool according to claim 1, characterized in that: A rectangular groove (6-1) is arranged in the middle section of the rivet head (6), and a clearance groove (6-2) is arranged in the upper section of the rivet head (6). The number of the rectangular groove (2-1) and the clearance groove (6-2) is three, and the fixing plate (5) is arranged in the rectangular groove (6-1).

3. The solenoid valve core riveting tool according to claim 1, characterized in that: The bottom center and side walls of the lower mold base (8) are both provided with air holes.

4. The solenoid valve core riveting tool according to claim 1, characterized in that: A through hole is provided at the center of the rivet head (6) and axially penetrates the rivet head (6), and the through hole is communicated with the air vent at the center of the bottom end of the lower die base (8).

5. The solenoid valve core riveting tool according to claim 1, characterized in that: A second rivet head (6-3) is arranged at the top end of the rivet head (6), the second rivet head (6-3) is arranged outside the through hole of the rivet head (6), and the diameter of the second rivet head (6-3) is smaller than the outer diameter of the rivet head (6).

6. The solenoid valve core riveting tool according to claim 1, characterized in that: A protrusion (9-1) is axially arranged on the upper end surface of the height limiting block (9), and the protrusion (9-1) is slidably matched with the clearance groove (6-2) on the upper section of the rivet head (6).

7. The solenoid valve core riveting tool according to claim 1, characterized in that: The pre-compression rod (2) is connected and fixed to the upper die base (1) by means of screws, the lower die cover (10) is connected and fixed to the lower die base (8) by means of screws, and the fixing plate (5) is connected and fixed to the height limiting block (9) by means of screws.

8. The solenoid valve core riveting tool according to claim 1, characterized in that: A centering piece (4) for aligning the upper die with the lower die is provided between the upper die and the lower die.

9. The solenoid valve core riveting tool according to claim 1, characterized in that: 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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