Device for testing drawing force of front yoke of electromagnetic valve

Abstract

According to the technical scheme, the drawing force testing device for the front yoke of the electromagnetic valve is characterized by comprising an internal expansion base, a vertical internal expansion shaft is in threaded connection with a threaded inner hole in the bottom of the internal expansion base, a center hole is formed in the internal expansion shaft, and the bottom of the center hole is in a big-end-down cone shape; the center hole is an unthreaded hole and is internally provided with an internal expansion bolt with the corresponding shape, the top area, located above the internal expansion shaft, of the internal expansion bolt is connected with a nut, the bottom end of the internal expansion shaft and the bottom end of the internal expansion bolt are located in a groove in the top face of the front yoke, and the outer side face of the top of the front yoke is clamped on the side wall of the shell in an interference mode. The shell is clamped into the connecting frame to be limited in the axial direction, the bottom of the connecting frame is fixed to the fixed end of the device, and the top of the internal expansion base is connected to the movable end of the drawing device. According to the utility model, the interference force between the front yoke and the housing can be rapidly tested through a drawing device, the overall structure is novel and simple, and the installation is convenient.

Description

Technical Field

[0001] The utility model relates to a pulling force testing device, in particular to a pulling force testing device for a front yoke iron of an electromagnetic valve. Background Art

[0002] The solenoid valve is the actuator of the engine's variable timing system. It adjusts the gas volume by controlling the advance and delay of the valve opening angle to achieve the purpose of reducing fuel consumption and increasing power. Therefore, the matching requirements of the parts are very high. The shell and the front yoke iron in the solenoid valve are connected by interference fastening to form a complete assembly.

[0003] The armature, an internal part of the solenoid valve assembly, will constantly hit the front yoke back and forth under the electromagnetic force formed when the solenoid valve is powered on and the elastic force of the external part spring. If the fastening force formed by the solenoid valve housing and the front yoke is too small, the constant impact of the armature will cause the two to fall off and separate, causing the solenoid valve to fail, thus causing an accident. Therefore, there are requirements for the force value formed by the interference fit between the solenoid valve housing and the front yoke, and a pull-out force test should be carried out to test its force value to meet the design requirements. Utility Model Content

[0004] In view of the above problems, the utility model aims to provide a solenoid valve front yoke pull-out force testing device, which has a novel structure and can quickly detect the interference fastening force between the housing and the front yoke of the solenoid valve.

[0005] The technical solution of the utility model is a pulling force testing device for the front yoke of an electromagnetic valve, characterized in that: it includes an inner expansion base, a vertical inner expansion shaft is threadedly connected in the threaded inner hole at the bottom of the inner expansion base, a center hole is arranged in the inner expansion shaft, the bottom of the center hole is a cone with a small top and a large bottom, the center hole is a smooth hole and an inner expansion bolt of corresponding shape is arranged inside, the inner expansion bolt is located in the top area above the inner expansion shaft and is connected with a nut, the bottom ends of the inner expansion shaft and the inner expansion bolt are located in the groove on the top surface of the front yoke, the outer side surface of the top of the front yoke is interference clamped on the side wall of the outer shell, the outer shell is clamped in the connecting frame to the axial upper limit, the bottom of the connecting frame is fixed to the fixed end of the equipment, and the top of the inner expansion base is connected to the movable end of the pulling equipment.

[0006] Preferably, the connecting frame includes a bottom plate, two left and right side plates and a top plate, a U-shaped groove is opened inwardly on the front side of the middle part of the top plate, a positioning groove is opened inwardly on the front side of the top surface of the bottom plate, a plastic package is connected to the bottom of the shell, the bottom of the plastic package is inserted into the positioning groove from front to back, the top surface of the shell is in contact with the bottom surface of the top plate to limit the position, and the internal expansion bolt and the internal expansion shaft pass through the U-shaped groove and extend out of the top of the top plate.

[0007] Preferably, an annular groove is provided on the top of the inner expansion base, the top of the inner expansion base is inserted into the sleeve, and a socket is provided on the bottom of the sleeve. After the pin is inserted into the socket, it extends into the annular groove to axially connect the inner expansion base and the sleeve to each other, and the sleeve is connected to the movable end of the drawing equipment.

[0008] Preferably, the bottom of the base plate is connected to a base via screws, and the base is connected to the fixed end of the device.

[0009] The utility model can quickly test the interference force between the front yoke iron and the shell through a drawing device, the overall structure is novel and simple, the installation is convenient, and the solenoid valve product can be easily put in and taken out. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model;

[0011] Figure 2 for Figure 1 A top view of

[0012] Figure 3 for Figure 2 Cross-sectional view along AA direction;

[0013] Figure 4 This is a structural schematic diagram of the solenoid valve product in the utility model after the internal expansion bolt, the internal expansion shaft and the nut are connected;

[0014] Figure 5 It is a structural schematic diagram of the connecting frame in the utility model;

[0015] Among them: 1—inner expansion base; 11—annular groove; 2—inner expansion shaft; 3—inner expansion bolt; 4—nut; 5—front yoke; 6—housing; 7—connecting frame; 71—bottom plate; 711—positioning slide groove; 72—side plate; 73—top plate; 731—U-shaped groove; 8—plastic coating; 9—sleeve; 91—jack; 10—base. DETAILED DESCRIPTION

[0016] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0017] like Figures 1 to 5As shown, the utility model provides a pulling force testing device for the front yoke of an electromagnetic valve, comprising an inner expansion base 1, a vertical inner expansion shaft 2 is threadedly connected in the threaded inner hole at the bottom of the inner expansion base 1, a center hole is arranged in the inner expansion shaft 2, the bottom of the center hole is a cone with a small top and a large bottom, the center hole is a smooth hole and an inner expansion bolt 3 of corresponding shape is arranged inside, the inner expansion bolt 3 is located in the top area above the inner expansion shaft 2 and is connected with a nut 4, the bottom ends of the inner expansion shaft 2 and the inner expansion bolt 3 are located in the groove on the top surface of the front yoke 5, the outer side surface of the top of the front yoke 5 is interference clamped on the side wall of the outer shell 6, the outer shell 6 is clamped into the inner axial upper limit of the connecting frame 7, the bottom of the connecting frame 7 is fixed to the fixed end of the equipment, and the top of the inner expansion base 1 is connected to the movable end of the pulling equipment.

[0018] In the above scheme, the connecting frame 7 includes a bottom plate 71, two left and right side plates 72 and a top plate 73. A U-shaped groove 731 is opened inwardly on the front side of the middle part of the top plate 73, and a positioning groove 711 is opened inwardly on the front side of the top of the bottom plate 71. The outer shell 6 is connected with a plastic package 8 below, and the bottom of the plastic package 8 is inserted into the positioning groove 711 from front to back. The top surface of the outer shell 6 is in contact with the bottom surface of the top plate 73 to limit the position, and the internal expansion bolt 3 and the internal expansion shaft 2 pass through the U-shaped groove 731 and extend out from the top of the top plate 73.

[0019] In addition, an annular groove 11 is provided at the top of the inner expansion base 1, and the top of the inner expansion base 1 is inserted into the sleeve 9. A socket 91 is provided at the bottom of the sleeve 9. After the pin is inserted into the socket 91, it extends into the annular groove 11 to axially connect the inner expansion base 1 and the sleeve 9 to each other. The sleeve 9 is connected to the movable end of the drawing equipment.

[0020] Furthermore, the bottom of the bottom plate 71 is connected to a base 10 via screws, and the base 10 is connected to the fixed end of the device.

[0021] The working principle of the utility model is as follows: insert the inner expansion bolt 3 from bottom to top into the center hole of the inner expansion shaft 2, connect the nut 4 at the top, connect the three into one, and then put the bottom into the top surface groove of the front yoke 5, tighten the nut 4 with a torque wrench to make the bottom of the inner expansion shaft 2 expand outward, read the measured torque and record it, and after reaching the predetermined torque, the bottom of the inner expansion shaft 2 expands and clamps the front yoke 5, and connects the inner expansion base 1 outside the inner expansion shaft 2, and at the same time, insert the above-mentioned integrated product from front to back into the connecting frame 7, so that the bottom of the plastic package 8 is stuck in the positioning slide groove 711, and the top surface of the shell 6 is in contact with the bottom surface of the top plate 73. The pulling device is controlled to make the sleeve 9 descend and insert into the top of the inner expansion base 1, and fixed with a pin. Subsequently, the pulling device is controlled to move upward to pull out the front yoke 5 and record the pulling force, that is, the clamping force between the front yoke 5 and the shell 6 is tested.

[0022] The above description is only a preferred implementation mode of the utility model, and does not impose any form of limitation on the utility model. Any simple modification, equivalent change or modification made to the above embodiments based on the technical principle of the utility model still falls within the scope of the technical solution of the utility model.

Claims

1. A solenoid valve front yoke pull-out force testing device, characterized in that: The invention comprises an inner expansion base (1), wherein a vertical inner expansion shaft (2) is threadedly connected in a threaded inner hole at the bottom of the inner expansion base (1), wherein a center hole is arranged inside the inner expansion shaft (2), wherein the bottom of the center hole is a cone with a small top and a large bottom, wherein the center hole is a smooth hole and an inner expansion bolt (3) of corresponding shape is arranged inside the center hole, wherein a nut (4) is connected to the top area of ​​the inner expansion bolt (3) located above the inner expansion shaft (2), wherein the bottom ends of the inner expansion shaft (2) and the inner expansion bolt (3) are located in a groove on the top surface of a front yoke (5), wherein the outer side surface of the top of the front yoke (5) is interference-clamped on the side wall of an outer shell (6), wherein the outer shell (6) is clamped in an axial upper limit position in a connecting frame (7), wherein the bottom of the connecting frame (7) is fixed to a fixed end of the equipment, and the top of the inner expansion base (1) is connected to a movable end of the drawing equipment.

2. The solenoid valve front yoke pull-out force testing device according to claim 1, characterized in that: The connecting frame (7) comprises a bottom plate (71), two left and right side plates (72) and a top plate (73); a U-shaped groove (731) is provided inwardly on the front side of the middle part of the top plate (73); a positioning slide groove (711) is provided inwardly on the front side of the top of the bottom plate (71); a plastic package (8) is connected to the bottom of the shell (6); the bottom of the plastic package (8) is inserted into the positioning slide groove (711) from front to back; the top surface of the shell (6) contacts and limits the bottom surface of the top plate (73); and the inner expansion bolt (3) and the inner expansion shaft (2) extend out of the top of the top plate (73) after passing through the U-shaped groove (731).

3. The solenoid valve front yoke pull-out force testing device according to claim 1, characterized in that: The top of the inner expansion base (1) is provided with an annular groove (11), the top of the inner expansion base (1) is inserted into the sleeve (9), the bottom of the sleeve (9) is provided with a socket (91), and the pin is inserted into the socket (91) and then extends into the annular groove (11) to axially connect the inner expansion base (1) and the sleeve (9), and the sleeve (9) is connected to the movable end of the drawing device.

4. A solenoid valve front yoke pull-out force testing device according to claim 2, characterized in that: The bottom of the bottom plate (71) is connected to a base (10) via screws, and the base (10) is connected to a fixed end of the device.

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