A positioning device for partial discharge testing of metal plates

Abstract

This utility model discloses a positioning device for partial discharge testing of metal plates. A bracket is provided on the base plate. The lifting mechanism includes a first drive unit and an insulated mounting frame. The first drive unit is mounted on the bracket, and the mounting frame is located at the output end of the first drive unit and moves up and down via a drive. The mounting frame has either the positive or negative electrode of a discharge assembly. The clamping mechanism includes a second drive unit, which is mounted on the mounting frame. Its output end is connected to the other electrode of the discharge assembly via an insulating block, and is driven to clamp the metal plate between the positive and negative electrodes of the discharge assembly. The liquid tank contains insulating oil for immersing the metal plate. This utility model clamps the metal plate using the clamping mechanism, and the lifting mechanism places the metal plate in the insulating oil for partial discharge testing. It can replace the operator in immersing the metal plate, achieving automatic immersion and detachment of the metal plate from the insulating oil without manual contact with the oil throughout the process.

Description

Technical Field

[0001] This utility model relates to the technical field of discharge testing devices, and in particular to a positioning device for partial discharge testing of metal plates. Background Technology

[0002] In the manufacturing of power electronic devices, the insulation performance of metal substrates such as copper-clad laminates and metal substrates directly determines the reliability and lifespan of the devices. Insulation performance can be assessed through partial discharge. Currently, there is no suitable equipment in the industry to test the partial discharge of copper-clad laminates and metal substrates. Testing equipment for other fields (such as ceramic substrates) presents challenges due to the complexity and safety issues associated with manual operation. Traditional testing methods require manually immersing the substrate in an insulating oil environment (such as transformer oil), requiring direct contact with the oil by the operator, leading to oil contamination and low operational efficiency. Existing technologies use an oil bath to fix the substrate and manually assemble probe covers (such as the partial discharge testing method for double-sided copper-clad ceramic substrates disclosed in CN113376484A), which is cumbersome, difficult to automate, and increases the risk of human error.

[0003] Moreover, in the prior art, for example, some devices fix the substrate by limiting posts and probe holes, but the introduction of metal parts may affect the electric field distribution, resulting in a higher background partial discharge (such as a partial discharge detection device for ceramic copper-clad laminates disclosed in CN222105577U). In addition, uneven contact pressure between the probe and the substrate during manual assembly may cause poor contact or distortion of the partial discharge signal.

[0004] Furthermore, existing devices are mostly designed for substrates of specific sizes or types, lacking versatility and making it difficult to adapt to substrates of different thicknesses or shapes. In addition, manual testing processes are difficult to implement for rapid batch testing, thus limiting testing efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a positioning device for partial discharge testing of metal plates. The clamping mechanism clamps the metal plate, and the lifting mechanism places the metal plate in insulating oil for partial discharge testing. It can replace the operator in immersing the metal plate, realize the automatic immersion and detachment of the metal plate from the insulating oil, and eliminate the need for manual contact with the oil throughout the process.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a positioning device for partial discharge testing of metal plates, comprising:

[0007] The base plate has a support frame on it.

[0008] The lifting mechanism includes a first drive unit and an insulated mounting bracket. The first drive unit is mounted on the bracket, and the mounting bracket is located at the output end of the first drive unit and moves up and down via a drive. The mounting bracket is provided with the positive or negative electrode of a discharge assembly.

[0009] The clamping mechanism includes a second drive unit, which is mounted on the mounting bracket and has its output end connected to the other electrode of the discharge assembly via an insulating block. The drive unit then clamps the metal plate between the positive and negative electrodes of the discharge assembly.

[0010] A liquid tank containing insulating oil for immersing metal sheets.

[0011] As a further optimization, the mounting bracket includes a first horizontal plate, a second horizontal plate, and connecting members. The first horizontal plate and the second horizontal plate are arranged vertically, and a pair of connecting members are vertically connected to the two ends of the first horizontal plate and the second horizontal plate, respectively. The negative electrode is disposed at the upper end of the second horizontal plate, and the second driving unit is disposed at the lower end of the first horizontal plate.

[0012] As a further optimization, the connector includes a vertical rod and nuts. The vertical rod is located at the lower end of the first horizontal plate and has threads on its lower part. The second horizontal plate is sleeved on the vertical rod through a through hole in its body. A pair of nuts are screwed onto the vertical rod and are located at the upper and lower ends of the second horizontal plate, respectively, which can realize the adjustment of the height of the second horizontal plate.

[0013] As a further optimization, the support is an H-shaped structure, which includes at least a vertical plate and a horizontal plate disposed between a pair of vertical plates, with the first drive unit disposed on the horizontal plate.

[0014] As a further optimization, the bracket also includes a pair of connecting plates with a right-angle structure, with the two ends of the horizontal plate fixed to the flat plates of the pair of connecting plates respectively, and the vertical plate of the connecting plate locked to the vertical plate.

[0015] As a further optimization, the positioning device for partial discharge testing of metal plates also includes a support member. The support member includes at least a first grid-shaped plate disposed on the mounting frame. The first grid-shaped plate has a first clearance ring in the middle, and the electrode located on the mounting frame is embedded in the first clearance ring and protrudes from the first clearance ring. The first grid-shaped plate can support the metal plate.

[0016] As a further optimization, the support also includes a second grid-shaped plate, the second grid-shaped plate having a second clearance ring in the middle, the second grid-shaped plate being connected to the first grid-shaped plate by multiple support blocks, the second grid-shaped plate and the first grid-shaped plate forming a cavity for accommodating the metal sheet, and at least one side forming an opening for embedding the metal sheet therein, the second grid-shaped plate and the first grid-shaped plate being located above and below the metal sheet respectively can prevent the metal sheet from undergoing large deformation when immersed in or detached from the insulating oil.

[0017] As a further optimization, a stop is provided inside the receiving cavity on the opposite side of the opening, which can limit the position of the metal plate inside the receiving cavity.

[0018] As a further optimization, the base plate has a cover, and a transparent door is hinged to the cover.

[0019] As a further optimization, at least the base plate is provided with an anti-fouling layer, which facilitates cleaning of the base plate when there is insulating oil on it.

[0020] Compared with the prior art, the present invention has the following advantages: the clamping mechanism clamps the metal plate with the positive and negative poles of the discharge component to achieve conduction, and the lifting mechanism places the metal plate in the insulating oil for partial discharge testing. It can replace the operator in immersing the metal plate, realize the automatic immersion and detachment of the metal plate from the insulating oil, and eliminate the need for manual contact with the oil throughout the process. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the present invention.

[0022] Figure 2 This is a structural diagram of the mounting bracket of this utility model.

[0023] Figure 3 This is an assembly structure diagram of the mounting bracket of this utility model.

[0024] Figure 4 This is a structural diagram of one embodiment of the support component of this utility model. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0026] like Figures 1 to 3As shown, a positioning device for partial discharge testing of metal plates includes a base plate 11, a bracket 20, a lifting mechanism 30, a clamping mechanism 40, and a liquid tank 51. The bracket 20 is disposed on the base plate 11. The lifting mechanism 30 includes a first drive unit 31 and an insulating mounting frame 32. The first drive unit 31 is disposed on the bracket 20. The mounting frame 32 is disposed at the output end of the first drive unit 31 and moves up and down by drive. The mounting frame 32 is provided with a positive or negative electrode of the discharge component. Preferably, a negative electrode 422 connected to the discharge component is provided on the mounting frame 32. The clamping mechanism 40 includes a second drive unit 41. The second drive unit 41 is disposed on the mounting frame 32, and its output end is connected to the positive electrode 421 of the discharge component through an insulating block 411. The positive electrode 421 is driven and clamped to the metal plate located between the two by the negative electrode 422. The liquid tank 51 contains insulating oil 52 for immersing the metal plate therein.

[0027] In this invention, initially, the first drive unit 31 drives the mounting frame 32 to be positioned above the insulating oil 52. When partial discharge testing is required on metal plates such as copper-clad laminates and metal substrates, a certain position on the lower end surface of the metal plate is placed against the negative electrode 422 on the mounting frame 32. The second drive unit 41 is then activated to drive the positive electrode 421 to move down and abut against a certain position on the upper end surface of the metal plate. The positive electrode 421 and the negative electrode 422 clamp the metal plate together, and the contact between the positive electrode 421 and the negative electrode 422 and the metal plate creates a discharge path. The first drive unit 31 is then activated, which drives the mounting frame 32 and the clamped metal plate to be immersed in the insulating oil 52 in the liquid tank 51. Activating the discharge assembly allows for partial discharge testing of the metal plate.

[0028] The clamping mechanism 40 of this invention clamps the metal plate using the positive electrode 421 and negative electrode 422 of the discharge assembly to achieve conductivity. The lifting mechanism 30 then places the metal plate in the insulating oil 52 for partial discharge testing. This replaces the operator's immersion of the metal plate, enabling automatic immersion and detachment from the insulating oil without manual contact. Furthermore, the positive electrode 421 and negative electrode 422 are connected to the external structure via insulating materials (mounting bracket 32 ​​and insulating block 411), such as non-metallic insulating structures, keeping them away from external metal parts and avoiding parasitic capacitance. In this application, a voltage of 0.1-10kV can be applied between the positive electrode 421 and negative electrode 422, and the background noise is reduced to below 5pc. After the test, some insulating oil will inevitably remain on the upper surface of the metal plate after it detaches from the insulating oil 52. Once the clamping mechanism 40 resets, the operator can simply tilt the metal plate and pour the insulating oil 52 into the liquid tank 51.

[0029] It should be noted that the discharge assembly includes a high-voltage generator and other related components, which are connected to the positive electrode 421 and the negative electrode 422 via wires. The high-voltage generator applies voltage and collects partial discharge signals in real time. In addition, both the first drive unit 31 and the second drive unit 41 can be linear drive structures such as cylinders or electric cylinders, which can drive the mounting bracket 32 ​​and the positive electrode 421 to move a set stroke. For example, the second drive unit 41 can control the pressure between the positive electrode 421 and the negative electrode 422 to be 0.1-1 MPa through the control of a pneumatic valve.

[0030] like Figure 2 As shown, in one embodiment of this utility model, the mounting frame 32 includes a first horizontal plate 321, a second horizontal plate 322, and connecting members 323. The first horizontal plate 321 and the second horizontal plate 322 are arranged vertically, and a pair of connecting members 323 are vertically connected to the two ends of the first horizontal plate 321 and the second horizontal plate 322, respectively. The negative electrode 422 is disposed at the upper end of the second horizontal plate 322, and the second driving unit 41 is disposed at the lower end of the first horizontal plate 321. The output end of the first driving unit 31 is connected to the upper end of the first horizontal plate 321. In this embodiment, the frame structure formed by the mounting frame 32 allows for relatively easy layout of the installation positions of the second driving unit 41, the positive electrode 421, and the negative electrode 422.

[0031] like Figure 3 As shown, the connector 323 further includes a vertical rod 3231 and a nut 3232. The upper end of the vertical rod 3231 is fixedly disposed at the lower end of the first horizontal plate 321, and its lower part is provided with a thread 3230. The second horizontal plate 322 is sleeved on the vertical rod 3231 at the position of the thread 3230 through a through hole 3220 in its body. A pair of nuts 3232 are respectively screwed into the position of the thread 3230 of the vertical rod 3231 and respectively abut against the upper end and the lower end of the second horizontal plate 322. Therefore, the position of the second horizontal plate 322 can be adjusted by adjusting the nuts 3232 located at the upper end and the lower end of the second horizontal plate 322, that is, adjusting the position of the negative electrode 422 on the second horizontal plate 322. The distance between the positive electrode 421 and the negative electrode 422 after the second driving unit 41 drives the positive electrode 421 to move down can be adjusted, which is applicable to the clamping of metal plates of different thicknesses. In addition, a thin flexible outer layer (such as PTFE tape) can be wrapped around the threaded position 3230 on the vertical rod 3231. This will not affect the screwed positioning of the nut 3232 and the thread 3230, but will also ensure the stability of the screwed connection and make it easy to remove the nut with tools.

[0032] Preferably, the bracket 20 has an H-shaped structure, which includes at least a vertical plate 21 and a horizontal plate 22 disposed between a pair of vertical plates 21. The first drive unit 31 is disposed at the middle position of the horizontal plate 22, which can realize the installation stability of the lifting mechanism 30 and the clamping mechanism 40.

[0033] Furthermore, the bracket 20 also includes a pair of right-angled connecting plates 23. The two ends of the horizontal plate 22 are respectively fixed to the flat plates of the pair of connecting plates 23. The vertical plate of the connecting plate 23 is locked to the vertical plate 21. The right-angled structure of the connecting plate 23 facilitates connection after contact with the horizontal plate 22 and the vertical plate 21 with a large contact area. Moreover, the vertical plate of the connecting plate 23 is locked to the vertical plate 21. Multiple locking holes can be provided on the vertical plate 21 from top to bottom. When the connecting plate 23 is locked in different locking holes, the horizontal plate 22 has different heights. Therefore, the heights of the lifting mechanism 30 and the clamping mechanism 40 can be adjusted to match the different heights of the insulating oil 52 in the liquid tank 51.

[0034] Combination Figure 2 and Figure 4 As shown, the positioning device for partial discharge testing of metal plates also includes a support member. The support member includes at least a first grid-shaped plate 61 fixed on the mounting frame 32 (second horizontal plate 322). The first grid-shaped plate 61 has four first through holes 611, and a first clearance ring 610 is provided in its middle. The negative electrode 422 located on the mounting frame 32 is embedded in the first clearance ring 610 and protrudes from the first clearance ring 610 to abut against the metal plate. When the metal plate to be tested has a large extension or a thin thickness in the horizontal plane, after the clamping mechanism 40 clamps a certain position on the metal plate, the other positions may sag under the influence of gravity because they are not supported. To ensure the stability of the metal plate, the metal plate can be supported by the rib structure of the first grid-shaped plate 61.

[0035] Furthermore, the support also includes a second grid-shaped plate 62, which has a similar structure to the first grid-shaped plate 61. The second grid-shaped plate 62 has four second through holes 621, and a second clearance ring 620 is provided in the middle. The second grid-shaped plate 62 is fixedly connected to the first grid-shaped plate 61 by multiple support blocks 63. A receiving cavity 600 for accommodating a metal plate is formed between the second grid-shaped plate 62 and the first grid-shaped plate 61, and an opening 601 for embedding the metal plate is formed on at least one side. In use, the metal plate is inserted into the receiving cavity 600 through the opening 601. During insertion, the end of the metal plate needs to pass over the negative electrode 422 and abut against the negative electrode 422 at a certain position at the lower end. The inner diameter of the second clearance ring 620 is slightly larger, so that the positive electrode 421 can pass through it and abut against the upper end of the metal plate. The metal sheet is confined within the support member, which provides support and ensures the stability of the metal sheet when it is thin (with certain bending characteristics) and when it is immersed in or removed from the insulating oil, the pressure generated by its movement relative to the insulating oil 52 will not cause deformation of the metal sheet.

[0036] Preferably, a stop 631 is provided inside the receiving cavity 600 on the opposite side of the opening 601, which can block and prevent the metal plate from extending out of the receiving cavity.

[0037] In addition, the base plate 11 has a cover 12, and a transparent door 121 is hinged to the cover 12, which can enable operation in a relatively closed environment; moreover, the base plate 11 is provided with an anti-fouling layer, such as a Teflon coating, which can more easily clean the insulating oil that splashes onto the base plate 11 during the test.

[0038] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A positioning device for partial discharge testing of metal plates, characterized in that, include: The base plate has a support frame on it. The lifting mechanism includes a first drive unit and an insulated mounting bracket. The first drive unit is mounted on the bracket, and the mounting bracket is located at the output end of the first drive unit and moves up and down via a drive. The mounting bracket is provided with the positive or negative electrode of a discharge assembly. The clamping mechanism includes a second drive unit, which is mounted on the mounting bracket and has its output end connected to the other electrode of the discharge assembly via an insulating block. The drive unit then clamps the metal plate between the positive and negative electrodes of the discharge assembly. A liquid tank containing insulating oil for immersing metal sheets.

2. The positioning device for partial discharge testing of metal plates according to claim 1, characterized in that, The mounting bracket includes a first horizontal plate, a second horizontal plate, and connecting members. The first horizontal plate and the second horizontal plate are arranged vertically, and a pair of connecting members are vertically connected to the two ends of the first horizontal plate and the second horizontal plate, respectively. The negative electrode is disposed at the upper end of the second horizontal plate, and the second driving unit is disposed at the lower end of the first horizontal plate.

3. The positioning device for partial discharge testing of metal plates according to claim 2, characterized in that, The connector includes a vertical rod and nuts. The vertical rod is located at the lower end of the first horizontal plate and has threads on its lower part. The second horizontal plate is sleeved on the vertical rod through a through hole in its body. A pair of nuts are screwed onto the vertical rod and are located at the upper and lower ends of the second horizontal plate, respectively.

4. The positioning device for partial discharge testing of metal plates according to claim 1, characterized in that, The support is an H-shaped structure, which includes at least one upright plate and a horizontal plate disposed between a pair of upright plates, and the first drive unit is disposed on the horizontal plate.

5. The positioning device for partial discharge testing of metal plates according to claim 4, characterized in that, The bracket also includes a pair of connecting plates with a right-angle structure. The two ends of the horizontal plate are respectively fixed to the flat plates of the pair of connecting plates, and the vertical plate of the connecting plate is locked to the vertical plate.

6. The positioning device for partial discharge testing of metal plates according to any one of claims 1 to 5, characterized in that, It also includes a support member, which includes at least a first grid-shaped plate disposed on the mounting bracket. The first grid-shaped plate has a first clearance ring in the middle, and the electrode located on the mounting bracket is embedded in the first clearance ring and protrudes from the first clearance ring.

7. The positioning device for partial discharge testing of metal plates according to claim 6, characterized in that, The support also includes a second grid-shaped plate, the second grid-shaped plate having a second clearance ring in the middle, the second grid-shaped plate being connected to the first grid-shaped plate by a plurality of support blocks, the second grid-shaped plate and the first grid-shaped plate forming a cavity for accommodating a metal sheet, and at least one side forming an opening for embedding the metal sheet therein.

8. The positioning device for partial discharge testing of metal plates according to claim 7, characterized in that, A baffle is provided inside the receiving cavity on the opposite side of the opening.

9. The positioning device for partial discharge testing of metal plates according to claim 1, characterized in that, The base plate has a cover, and a transparent door is hinged to the cover.

10. The positioning device for partial discharge testing of metal plates according to claim 1 or 9, characterized in that, At least the base plate is provided with an anti-fouling layer.

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