Test fixture

Abstract

The utility model designs a test fixture which is used for testing the insulation performance of an iron core and comprises an upper die, a lower die, a first electrode and a second electrode, the first electrode is connected with the lower die, the upper die is opposite to the lower die and is connected with the second electrode, the first electrode is provided with a first accommodating cavity used for supporting the iron core, and the second electrode is provided with a second accommodating cavity. When the upper die moves to abut against the lower die, the size of a cavity formed by the first containing cavity and the second containing cavity is matched with the size of the iron core, the iron core is limited in the cavity, and all test points of a positive electrode test area and all test points of a negative electrode test area of the iron core are connected with the first electrode and the second electrode. The insulation performance of the iron core can be comprehensively evaluated, any insulation weak points or defects existing on the iron core can be found, the high-voltage tester is electrically connected with the first electrode and the second electrode, the insulation condition of the iron core in the actual working environment can be simulated, and therefore the insulation capacity of the iron core under the high voltage can be accurately evaluated.

Description

Technical Field

[0001] The utility model relates to the technical field of iron core testing, in particular to a testing fixture. Background Art

[0002] In the field of power equipment, the insulation performance of the iron core is one of the key factors to ensure the safe operation of the equipment and extend its service life. Therefore, it is particularly important to accurately test the insulation performance of the iron core.

[0003] In the prior art, one end of an insulation resistance tester is connected to the insulation part to be tested of the iron core, and the other end of the insulation resistance tester is connected to the grounded part of the iron core or the metal shell of the equipment to ensure good grounding, so as to measure the resistance of the iron core to reflect the insulation state. It is very simple, but it cannot comprehensively evaluate the insulation ability of the iron core under high voltage and complex electromagnetic environment. Therefore, it is necessary to improve the prior art. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a testing fixture to solve the technical problem that the insulation resistance tester in the prior art cannot comprehensively evaluate the insulation ability of the iron core under high voltage and complex electromagnetic environment.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A testing fixture for testing the insulation performance of an iron core, which includes an upper mold, a lower mold, a first electrode and a second electrode. The first electrode is connected to the lower mold, the upper mold is opposite to the lower mold and connected to the second electrode. The first electrode is provided with a first accommodating cavity for supporting the iron core, and the second electrode is provided with a second accommodating cavity. When the upper mold moves to abut against the lower mold, the size of the cavity formed by the first accommodating cavity and the second accommodating cavity matches the iron core, and the iron core is limited in the cavity. A high-voltage tester is electrically connected to the first electrode and the second electrode.

[0007] Preferably, the testing fixture further includes conductive silica gel, and the conductive silica gel is connected to the groove walls of the first accommodating cavity and the second accommodating cavity.

[0008] Preferably, the lower mold is further connected with a positioning block. The iron core is hollow to form a groove body, and the length of the positioning block is the same as the length of the groove body. The positioning block passes through the groove body to limit the iron core.

[0009] Preferably, the testing fixture further includes an elastic member. The upper mold includes a first pressing plate and a second pressing plate. The elastic member is arranged between the first pressing plate and the second pressing plate, and the second electrode is connected to the second pressing plate.

[0010] Preferably, the test fixture further includes a guiding pin, the guiding pin is connected to the second pressing plate, and a guiding hole is provided at a position of the lower die corresponding to the guiding pin.

[0011] Preferably, the test fixture further includes an L-shaped limiting block, the L-shaped limiting block is connected to the first pressing plate to form a limiting space, and the second pressing plate is located within the limiting space.

[0012] Preferably, the test fixture further includes a connecting member, the first pressing plate is provided with a first threaded hole, the L-shaped limiting block is provided with a second threaded hole, and the connecting member is threadedly connected to the first threaded hole and the second threaded hole.

[0013] Preferably, a partition plate is connected to the upper die, the partition plate penetrates through the second electrode, when the upper die moves to abut against the lower die, the partition plate passes through the groove body and abuts against the positioning block, and both the positioning block and the partition plate are insulating plates.

[0014] Preferably, the test fixture further includes a driver, the driver is connected to the upper die and is used for driving the upper die to move in a direction close to or away from the lower die.

[0015] Preferably, the driver is any one of a cylinder or a push rod.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] The present utility model designs a test fixture for testing the insulation performance of an iron core, which includes an upper die, a lower die, a first electrode and a second electrode. The first electrode is connected to the lower die, the upper die is opposite to the lower die and is connected to the second electrode. The first electrode is provided with a first accommodating cavity for supporting the iron core, the second electrode is provided with a second accommodating cavity. When the upper die moves to abut against the lower die, the size of the cavity formed by the first accommodating cavity and the second accommodating cavity matches that of the iron core, and the iron core is limited within the cavity. The high-voltage tester is electrically connected to the first electrode and the second electrode. The size of the cavity of the present utility model matches that of the iron core, and all the test points in the positive electrode test area and all the test points in the negative electrode test area of the iron core will be connected to the first electrode and the second electrode, so as to realize a comprehensive evaluation of the insulation performance of the iron core, which helps to discover any insulation weaknesses or defects existing on the iron core. By directly electrically connecting the first electrode and the second electrode with the high-voltage tester, the insulation condition of the iron core in the actual working environment can be simulated, so as to accurately evaluate its insulation ability under high voltage. Description of the Drawings

[0018] Figure 1 is an exploded view of the test fixture of the present utility model;

[0019] Figure 2 is a schematic structural diagram of the test fixture of the present utility model.

[0020] Illustration:

[0021] 10. First pressing plate; 11. Second pressing plate; 12. Elastic member; 13. Guide pin; 14. L-shaped limiting block; 15. Partition; 16. Second accommodating cavity; 17. Second electrode;

[0022] 20. Lower die; 21. First electrode; 22. First accommodating cavity; 23. Guide hole; 24. Conductive silica gel; 25. Iron core; 26. Groove body; 27. Positioning block. Detailed implementation manners

[0023] In order to make the utility model purposes, features, and advantages of the present utility model more obvious and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] The technical solutions of the present utility model will be further described below with reference to the accompanying drawings and through specific implementation manners.

[0025] Please refer to Figure 1 and Figure 2 As shown, the present utility model designs a test fixture for testing the insulation performance of the iron core 25, which includes an upper die, a lower die 20, a first electrode 21, and a second electrode 17. The first electrode 21 is connected to the lower die 20, the upper die is opposite to the lower die 20 and connected to the second electrode 17. The first electrode 21 is provided with a first accommodating cavity 22 for supporting the iron core 25, and the second electrode 17 is provided with a second accommodating cavity 16. When the upper die moves to abut against the lower die 20, the size of the cavity formed by the first accommodating cavity 22 and the second accommodating cavity 16 matches that of the iron core 25, and the iron core 25 is limited within the cavity. The high-voltage tester is electrically connected to the first electrode 21 and the second electrode 17.

[0026] The iron core 25 of the present utility model includes a core body and an insulating film. The insulating film covers the core body. The size of the cavity matches that of the iron core 25. All the test points in the positive test area and all the test points in the negative test area of the iron core 25 are connected to the first electrode 21 and the second electrode 17, which can realize a comprehensive evaluation of the insulation performance of the iron core 25, help to discover any insulation weaknesses or defects existing on the iron core 25. By directly electrically connecting the first electrode 21 and the second electrode 17 with the high-voltage tester, the insulation condition of the iron core 25 in the actual working environment can be simulated, so as to accurately evaluate its insulation ability under high voltage.

[0027] Specifically, the test fixture further includes conductive silicone 24, and the conductive silicone 24 is connected to the groove walls of the first accommodating cavity 22 and the second accommodating cavity 16. The conductive silicone 24 can play a buffering role, reducing the direct impact of the upper die and the lower die 20 on the iron core 25, reducing the problem of damage to the iron core 25 caused by testing. It can also fill the gap between the cavity and the iron core 25 to ensure the connection performance between the first electrode 21, the second electrode 17 and the iron core 25. In addition, the resistance of the conductive silicone 24 is very small, less than 1 Ω, and the heat generated by the resistance of the conductive silicone 24 is small.

[0028] Specifically, the lower die 20 is further connected with a positioning block 27. The iron core 25 is hollow to form a groove body 26. The length of the positioning block 27 is the same as that of the groove body 26, and the positioning block 27 passes through the groove body 26 to limit the iron core 25.

[0029] Specifically, the upper die is connected with a partition plate 15. The partition plate 15 penetrates through the second electrode 17. When the upper die moves to abut against the lower die 20, the partition plate 15 passes through the groove body 26 and abuts against the positioning block 27. Both the positioning block 27 and the partition plate 15 are insulating plates.

[0030] Both the positioning block 27 and the partition plate 15 are made of insulating materials. They can effectively isolate the positive test area and the negative test area of the iron core 25. During the high-voltage test process, this insulation isolation is crucial because it can prevent the current from flowing through the unintended path, ensuring that the test current only flows through the intended path, which helps to accurately evaluate the insulation performance of the iron core 25. The positioning block 27 stabilizes the position of the iron core 25 in the test fixture, reducing the test errors caused by the movement or tilt of the iron core 25 during the test.

[0031] Specifically, the test fixture further includes an elastic member 12. The upper die includes a first pressing plate 10 and a second pressing plate 11. The elastic member 12 is disposed between the first pressing plate 10 and the second pressing plate 11, and the second electrode 17 is connected to the second pressing plate 11. The elastic member 12 disposed between the first pressing plate 10 and the second pressing plate 11 can play a buffering role when the upper die presses down, reducing the mechanical stress generated by the direct impact, thereby protecting the iron core 25 from damage. When the upper die abuts against the lower die 20, the elastic member 12 is in a compressed state. At this time, the elastic member 12 will push the second electrode 17 to move in the direction close to the first electrode 21 to ensure the connection between the first motor, the second motor and the iron core 25.

[0032] Specifically, the test fixture further includes a guide pin 13. The guide pin 13 is connected to the second pressing plate 11, and a guide hole 23 is provided at the position of the lower die 20 corresponding to the guide pin 13. The guide pin 13 of the present utility model passes through the guide hole 23, and when the upper die moves, it can only move smoothly along the predetermined trajectory without deviation.

[0033] Specifically, the test fixture further includes an L-shaped limiting block 14. The L-shaped limiting block 14 is connected to the first pressing plate 10 to form a limiting space, and the second pressing plate 11 is located within the limiting space.

[0034] The L-shaped limiting block 14 is connected to the first pressing plate 10 to form a limiting space, and the second pressing plate 11 is located within this limiting space. This design restricts the movement range of the second pressing plate 11, ensuring that it will not exceed the predetermined limit when moving up and down. This helps to prevent the problem of damaging the iron core 25 due to excessive movement of the second pressing plate 11.

[0035] Specifically, the test fixture further includes a connecting member. The first pressing plate 10 is provided with a first threaded hole, and the L-shaped limiting block 14 is provided with a second threaded hole. The connecting member is threadedly connected to the first threaded hole and the second threaded hole. The connecting member of the present utility model is a bolt. By using the bolt to connect the first pressing plate 10 and the L-shaped limiting block 14, not only is the installation and disassembly of the L-shaped limiting block 14 simple, but also the size of the limiting space between the first pressing plate 10 and the L-shaped limiting block 14 can be adjusted.

[0036] Specifically, the test fixture further includes a driver. The driver is connected to the upper die and is used to drive the upper die to move in a direction close to or away from the lower die 20. Driving the upper die by the driver reduces manual labor and improves the automation level of the production line. Of course, it should be noted that the driver of the present utility model is a cylinder or a push rod. In practical applications, other devices can also be selected to replace the cylinder or the push rod, and the present utility model does not make any limitations in this regard.

[0037] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0038] As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A test fixture for testing the insulation performance of an iron core, characterized in that: It includes an upper die, a lower die, a first electrode and a second electrode. The first electrode is connected to the lower die. The upper die is opposite to the lower die and connected to the second electrode. The first electrode is provided with a first accommodation cavity for supporting an iron core. The second electrode is provided with a second accommodation cavity. When the upper die moves to abut against the lower die, the size of the cavity formed by the first accommodation cavity and the second accommodation cavity matches that of the iron core, and the iron core is limited within the cavity. A high-voltage tester is electrically connected to the first electrode and the second electrode.

2. The test fixture according to claim 1, characterized in that: It further includes conductive silica gel, and the conductive silica gel connects the groove walls of the first accommodation cavity and the second accommodation cavity.

3. The test fixture according to claim 1, wherein: The lower die is further connected with a positioning block. The iron core is hollow to form a groove body. The length of the positioning block is the same as that of the groove body, and the positioning block passes through the groove body to limit the iron core.

4. The test fixture according to claim 1, wherein: It further includes an elastic member. The upper die includes a first pressing plate and a second pressing plate. The elastic member is arranged between the first pressing plate and the second pressing plate, and the second electrode is connected to the second pressing plate.

5. The test fixture according to claim 4, wherein: It further includes a guide pin. The guide pin is connected to the second pressing plate, and the lower die is provided with a guide hole corresponding to the position of the guide pin.

6. The test fixture according to claim 4, wherein: It further includes an L-shaped limiting block. The L-shaped limiting block is connected to the first pressing plate to form a limiting space, and the second pressing plate is located within the limiting space.

7. The test fixture according to claim 6, wherein: It further includes a connecting member. The first pressing plate is provided with a first threaded hole, the L-shaped limiting block is provided with a second threaded hole, and the connecting member is threadedly connected to the first threaded hole and the second threaded hole.

8. The test fixture according to claim 3, wherein: The upper die is connected with a partition plate. The partition plate penetrates through the second electrode. When the upper die moves to abut against the lower die, the partition plate passes through the groove body and abuts against the positioning block. Both the positioning block and the partition plate are insulating plates.

9. The test fixture according to claim 1, wherein: It further includes a driver. The driver is connected to the upper die and is used to drive the upper die to move in a direction close to or away from the lower die.

10. The test fixture according to claim 9, wherein: The driver is any one of a cylinder or a push rod.

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