Thermoplastic treatment auxiliary tool for connecting copper bar insulating tube for dry-type transformer

Abstract

The thermoplastic treatment auxiliary tool for the connecting copper bar insulating tube for the dry-type transformer is characterized in that the thermoplastic treatment auxiliary tool is made of a long-strip-shaped steel plate, the two sides of the steel plate are bent towards the same side to form a right-angle shape to form a long-strip-shaped groove, a rectangular steel sheet is cut off at the position, corresponding to a mounting hole of a copper bar, of the bottom face of the long-strip-shaped groove to form a rectangular gap, and the rectangular gap is formed in the middle of the long-strip-shaped groove. And the size of the rectangular neutral position is the same as that of a lap joint surface formed by vertically lapping the two copper bars. The thermoplastic treatment auxiliary tool for the connecting copper bar insulating tube can adapt to all dry-type transformers of which the low voltage is copper bar connection, and by adopting the thermoplastic treatment auxiliary tool for the insulating tube, the trimmed appearance is uniform, neat and attractive after the insulating tube is thermally shrunk, so that the acceptance inspection requirement on the appearance of the transformer is better met, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to an auxiliary tooling for thermoplastic treatment of the insulating tube of the connecting copper busbar for dry-type transformers, belonging to the technical field of transformer manufacturing. Background Technology

[0002] With rapid economic and industrial development, the requirements for power safety, stable power supply, and emergency response measures are constantly being improved. The State Grid's acceptance requirements for products are becoming increasingly stringent, with strict demands not only on product quality but also on appearance. In dry-type transformers, the connecting copper busbars occupy one of the most prominent positions in terms of appearance. Improper handling can significantly impact the overall conductivity and appearance of the product. The connecting copper busbars are covered with heat-shrinkable insulating tubing, which needs to be cut off at the connection points. How to neatly and cleanly remove the insulating tubing without affecting the conductivity of the copper busbars is a challenging aspect of the manufacturing process. Summary of the Invention

[0003] This utility model provides an auxiliary tooling for thermoplastic treatment of the insulating tube of the connecting copper busbar for dry-type transformers.

[0004] The technical solution of this utility model is as follows:

[0005] A thermoplastic treatment auxiliary tooling for the insulating tube of the connecting copper busbar of a dry-type transformer is characterized by: it is made of a long strip of steel plate, with both sides of the steel plate bent into a right angle to the same side to form a long strip groove, and a rectangular steel piece is cut off on the bottom surface of the long strip groove at the location corresponding to the mounting hole of the copper busbar to form a rectangular gap, the size of which is the same as the size of the overlapping surface of the two copper busbars perpendicularly overlapping.

[0006] In a further preferred embodiment, the width of the elongated groove is approximately equal to the width of the copper busbar, allowing the copper busbar to fit snugly into the groove.

[0007] In a further preferred embodiment, the bottom surface of the groove has two processing positioning holes, which are set to correspond to the processing positioning holes on the copper busbar. After the copper busbar is inserted into the groove, the connecting copper busbar and the groove are fixed together by inserting bolts into the processing positioning holes of both, which facilitates the cutting of the heat shrinkable plastic tube on the connecting copper busbar.

[0008] The beneficial effect of this utility model is that when using this auxiliary tooling, there is no need to measure again or use other auxiliary tools when cutting and opening holes in the insulating plastic tube on the copper busbar. After the insulating plastic tube on the copper busbar has been heat-shrinked, when it is necessary to open a hole, the auxiliary tooling is fixed on the copper busbar, and the exposed part is removed with a knife to complete the process requirements.

[0009] Practical experience has proven that the auxiliary tooling for thermoplastic treatment of insulation tubes in dry-type transformers can meet the usage requirements of dry-type transformers with copper busbar connections in the low-voltage section. Because it uses mold tooling, no further measurement or other auxiliary tooling is needed during cutting and drilling, greatly improving work efficiency. At the same time, it ensures a uniform, neat, and aesthetically pleasing appearance of the thermoplastic tubes, better meeting the acceptance requirements for the transformer's appearance and guaranteeing the conductivity of the connecting copper busbars. It is applied to dry-type transformers with copper busbar connections in the low-voltage windings. Attached Figure Description

[0010] Figure 1 , Figure 3 The images shown are, in order, the main view and the left view of the auxiliary tooling structure. Figure 2 for Figure 1 A close-up view of the diagram. Figure 4 This is a schematic diagram to aid in the processing flow.

[0011] In the diagram, 1 is a long groove, 2 is a mounting hole, 3 is a rectangular gap, and 4 is a machined positioning hole. Detailed Implementation

[0012] The attached figure shows a specific embodiment of this utility model.

[0013] The auxiliary tooling for thermoplastic treatment of the connecting copper busbar insulation tube of this utility model is made of a long strip of steel plate. The two sides of the steel plate are bent into right angles to the same side to form a long strip groove 1. A rectangular steel piece is cut off on the bottom surface of the long strip groove at the location corresponding to the mounting hole 2 of the copper busbar to form a rectangular gap 3. The size of the rectangular gap is the same as the size of the overlapping surface of the two copper busbars perpendicularly overlapping.

[0014] The width of the elongated groove is similar to the width of the copper busbar, allowing the copper busbar to fit snugly into the groove.

[0015] The bottom surface of the groove has two machining positioning holes 4, which are set to correspond to the machining positioning holes 4 on the copper busbar. After the copper busbar is inserted into the groove, the connecting copper busbar and the groove are fixed together by inserting bolts into the machining positioning holes of both, which makes it easy to cut the heat shrink plastic tube on the connecting copper busbar.

[0016] At the copper busbar overlap, the heat-shrink plastic tubing on the front, back, and both sides must be cut off. The groove depth of the auxiliary fixture should match the thickness of the copper busbar. When cutting the plastic tubing on the back, remove the copper busbar from the auxiliary fixture, flip it over, and then put it back into the auxiliary fixture to cut the plastic tubing. After cutting the back side, remove the copper busbar from the auxiliary fixture and then cut off the plastic tubing on the left and right sides of the copper busbar.

[0017] For example, one type of copper busbar is 80 cm long and 8 cm wide, used on an 800 kVA transformer. The required auxiliary tooling dimensions are compatible with this, and the steel plate thickness needed to manufacture the tooling is 0.4-0.8 mm. This is just an example; depending on the specific specifications of the copper busbar, batches of copper busbars will require auxiliary tooling of different sizes.

[0018] This auxiliary tooling for thermoplasticizing insulating tubes is used to trim and process the heat-shrinkable insulating plastic tubing covering the connecting copper busbars. This ensures that the thermoplasticizing process does not affect the conductivity of the connecting copper busbars. Furthermore, after heat shrinking and trimming, the connecting copper busbars have a uniform, neat, and aesthetically pleasing appearance, better meeting the transformer's appearance acceptance requirements and improving work efficiency. This auxiliary tooling for thermoplasticizing insulating tubes covering connecting copper busbars is suitable for all dry-type transformers where the low-voltage windings are connected by copper busbars.

Claims

1. An auxiliary tooling for thermoplastic treatment of the insulating tubes of connecting copper busbars in dry-type transformers, characterized in that: It is made of a long strip of steel plate, with both sides of the steel plate bent into a right angle to the same side to form a long strip groove. A rectangular steel plate is cut off from the bottom surface of the long strip groove at the location corresponding to the mounting hole of the copper busbar to form a rectangular gap. The size of the rectangular gap is the same as the size of the overlapping surface of the two copper busbars when they are perpendicularly joined.

2. The auxiliary tooling for thermoplastic treatment of the insulating tubes of the connecting copper busbars for dry-type transformers according to claim 1, characterized in that: The width of the elongated groove is similar to the width of the copper busbar, allowing the copper busbar to fit snugly into the groove.

3. The auxiliary tooling for thermoplastic treatment of the insulating tubes of the connecting copper busbars for dry-type transformers according to claim 1, characterized in that: The bottom of the groove has two machining positioning holes, which correspond to the machining positioning holes on the copper busbar. After the copper busbar is inserted into the groove, the connecting copper busbar and the groove are fixed together by inserting bolts into the machining positioning holes of both, which makes it easy to cut the heat shrink plastic tube on the connecting copper busbar.

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