Automatic cutting method for interlayer insulating paper of high-voltage winding of transformer

Abstract

The invention relates to an automatic cutting method for the interlayer insulating paper of the high-voltage wire package of a transformer. A wider paper tape is automatically cut into narrow paper tapes by a paper cutter for the winding of end insulation, so that the range of selection of the layer insulation is wider, and at the same time, the end insulation can be narrower, the winding effect is better, and the production cost is reduced; through the setting of inserting the paper cutter into the insulating paper, when the paper cutter moves axially on the coil, it is convenient to cut the insulating paper, avoiding cutting the insulating paper from one side of the insulating paper, so that the insulating paper is squeezed by the paper cutter and part of the insulating paper cannot be cut; through the setting of the rotating roller, a guiding effect is given to the insulating paper, and at the same time, through the setting of the power device, the relative sliding of the two main boards is conveniently realized; through the setting of the paper cutting board, the insulating paper passes over the paper cutting board from the top surface of the paper cutting board, and when the paper cutter moves downward to pierce the insulating paper, it plays a role in supporting the insulating paper.

Description

Technical Field

[0001] The invention relates to the field of transformers, particularly to the field of insulating paper winding technology, specifically referring to an automatic cutting method for the interlayer insulating paper of the high-voltage wire package of a transformer. Background Art

[0002] The entire coil of an oil-immersed transformer is immersed in transformer oil, one for insulation and the other for heat dissipation. Usually, the conductor of the high-voltage coil is composed of paper-covered wire or enameled wire with an insulating coating. Since the number of turns of the high-voltage coil is relatively large, it is usually wound in multiple layers. At the same time, due to the relatively high voltage between layers, insulating paper is usually added between layers.

[0003] The current relatively new process is to wind with a paper tape of a certain width. Since the end insulation is also wound with this paper tape, and the width of the end insulation is restricted by cost and process and cannot be too wide. Although there is also an end insulation compensation device in the existing solution, in many cases, the operator will abandon using the compensation device and instead adopt a manual compensation method for the end insulation, which reduces the production efficiency. Designers also have great limitations in choosing the width of the paper tape, and at the same time, it increases the difficulty of coil design. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the invention provides an automatic cutting method for the interlayer insulating paper of the high-voltage wire package of a transformer. The wider paper tape is automatically cut into narrow paper tapes by a paper cutter for winding the end insulation, so that the range of selection of the layer insulation is wider, and at the same time, the end insulation can be narrower, the winding effect is better, and the production cost is also reduced.

[0005] The automatic cutting method for the interlayer insulating paper of the high-voltage wire package of a transformer includes the following steps:

[0006] a. The upper insulating paper and the lower insulating paper are arranged alternately and wound along the axial direction of the coil;

[0007] b. When reaching the end of the coil, the upper insulating paper reaches the end of the coil first. At this time, the upper paper cutter is inserted into the upper insulating paper and cuts along the conveying direction of the upper insulating paper. At this time, the upper paper cutter and the upper insulating paper continue to move synchronously in the same direction along the axial direction of the coil, which will cause the excess insulating paper to wind outside the coil. Therefore, the upper paper cutter is driven to move in the reverse direction of the movement of the insulating paper, so that the width of the cut upper insulating paper increases, thereby ensuring that the upper insulating paper wound outside the coil is automatically cut;

[0008] c. When the lower insulating paper reaches the end of the coil, since the thickness of the insulating paper has not reached the requirement at this time, it is necessary to continue winding. At the same time, the edge of the lower insulating paper is not aligned with the end of the coil. Therefore, similarly, the lower insulating paper is automatically cut by the reverse movement of the lower paper cutter;

[0009] d. Then drive the upper insulating paper to move along the moving direction of the upper paper cutter, so that the two layers of insulating paper completely overlap. At this time, the two layers of insulating paper just wind around the end of the coil, and the width of the two layers of insulating paper after cutting is the width of the coil end. Then stop the axial movement of the two layers of insulating paper along the coil, and at the same time stop the movement of the upper and lower paper cutters, so that the two layers of insulating paper wind around the coil end to ensure the thickness of the insulating paper at the coil end;

[0010] e. When the insulating paper reaches the required thickness, stop winding the two layers of insulating paper. Then use the pneumatic paper pressing mechanism on the upper layer and the pneumatic paper pressing mechanism on the lower layer to clamp the upper and lower layers of insulating paper respectively. Then manually cut the insulating paper, and use tape to stick the tail ends of the two layers of insulating paper on the coil. Preferably, there is a certain distance between the insertion point where the paper cutter inserts into the insulating paper and the edge of the insulating paper.

[0011] The setting of this preferred scheme is convenient for the paper cutter to cut the insulating paper when moving axially along the coil, avoiding the paper cutter cutting the insulating paper from one side of the insulating paper, so as to prevent the insulating paper from being extruded by the paper cutter and causing some insulating paper not to be cut.

[0012] Preferably, a bracket is arranged on one side of the coil. The bracket moves axially along the coil. Two main boards are also connected to the bracket and are slidably connected axially along the coil and arranged in the height direction. A roller for the upper insulating paper to bypass is arranged on the upper main board, and a roller for the lower insulating paper to bypass is arranged on the lower main board. A power device for driving the upper main board to slide axially along the coil is also arranged on the bracket.

[0013] When this preferred scheme is used, through the setting of the roller, a guiding effect is given to the insulating paper. At the same time, through the setting of the power device, it is convenient to realize the relative sliding of the two main boards.

[0014] Preferably, a paper cutting cylinder moving axially along the coil is arranged on the main board, and a corresponding paper cutter inserted into the corresponding insulating paper is arranged on the extending end of the paper cutting cylinder.

[0015] The setting of this preferred scheme facilitates driving the paper cutter to move axially along the coil through the paper cutting cylinder.

[0016] Preferably, a paper cutting board corresponding to the paper cutter is arranged on the main board. The insulating paper passes between the paper cutter and the paper cutting board, and a long hole for the paper cutter to insert is opened on the paper cutting board.

[0017] The setting of this preferred scheme enables the insulating paper to cross over the paper cutting board from the top surface of the paper cutting board, and plays a role in supporting the insulating paper when the paper cutter moves downward to pierce the insulating paper.

[0018] Preferably, the pneumatic paper pressing mechanism includes a pneumatic cylinder and a lapping plate which are both arranged on the bracket and located on the upper and lower sides of the insulating paper, and the pneumatic cylinder extends to press the insulating paper on the lapping plate.

[0019] In this preferred solution, when cutting the insulating paper, the pneumatic cylinder is driven to press the insulating paper on the lapping plate, and then it is convenient for manual cutting of the insulating paper.

[0020] Preferably, the rotating roller includes a first guiding roller and a second guiding roller close to the coil. The first guiding roller is located between the coil and the second guiding roller, and the insulating paper sequentially bypasses the first guiding roller and the second guiding roller and then winds around the coil.

[0021] The setting of this preferred solution facilitates the tensioning of the insulating paper.

[0022] Preferably, a first air cylinder for driving the lower main board to move in the height direction is provided on the bracket.

[0023] With the setting of the first air cylinder in this preferred solution, it is convenient to drive the two main boards to move in height, so as to facilitate winding the insulating paper around the coil.

[0024] Preferably, a second slide rail extending in the height direction is further provided on the bracket. A second slider is slidably connected to the second slide rail, and the upper main board is slidably connected to the second slider along the axial direction of the coil.

[0025] With the setting of the second slider and the second slide rail in this preferred solution, it plays a guiding role when the main board moves in the height direction.

[0026] Preferably, a baffle is further provided on the main board, and the paper cutter is located between the baffle and the main board.

[0027] With the setting of the baffle in this preferred solution, it is convenient to protect the paper cutter.

[0028] The beneficial effects of the invention are as follows: The wider paper tape is automatically cut into narrow paper tapes by the paper cutter for the winding of the end insulation, so that the range of selection of the layer insulation is wider, and at the same time the end insulation can be narrower, the winding effect is better, and the production cost is also reduced; By setting the paper cutter to insert into the insulating paper, when the paper cutter moves axially along the coil, it can cut the insulating paper, avoiding cutting the insulating paper from one side of the insulating paper, so that the insulating paper is extruded with the paper cutter and part of the insulating paper cannot be cut; Through the setting of the rotating roller, it gives a guiding role to the insulating paper, and at the same time through the setting of the power device, it is convenient to realize the relative sliding of the two main boards; Through the setting of the paper cutting board, the insulating paper crosses the top surface of the paper cutting board, and when the paper cutter moves downward to pierce the insulating paper, it plays a role in supporting the insulating paper. Brief Description of the Drawings

[0029] Figure 1Schematic diagram of the invention structure;

[0030] Figure 2 Stereoscopic diagram at the bracket;

[0031] Figure 3 Stereoscopic diagram at the main board;

[0032] Figure 4 is Figure 3 front view schematic diagram of;

[0033] Figure 5 is Figure 3 top view schematic diagram of;

[0034] Figure 6 is Figure 3 left view schematic diagram of;

[0035] Figure 7 is Figure 3 rear view schematic diagram of;

[0036] Figure 8 Enlarged schematic diagram at the main board when insulating paper is wound;

[0037] Figure 9 Enlarged schematic diagram at the paper cutter;

[0038] Figure 10 is Figure 3 stereoscopic diagram from another angle of;

[0039] Figure 11 is Figure 3 stereoscopic diagram from yet another angle of;

[0040] Figure 12 Front view schematic diagram at the tip of the paper cutter;

[0041] As shown in the figure:

[0042] 1. Bracket, 2. Central roller of the coil, 3. Drag chain, 4. Main board, 5. Paper cutter, 6. Baffle, 7. Paper cutting cylinder, 8. Pneumatic cylinder, 9. Lapping plate, 10. Paper cutting board, 11. First wire roller, 12. Second guide roller, 13. Second slider, 14. Second slide rail, 15. Insulating paper, 16. First slide rail, 17. First slide plate, 18. First cylinder, 19. Sliding connection at the two-layer main board, 20. Support rod, 21. Motor, 22. Fourth slider, 23. Third slider, 24. Long hole. Specific implementation mode

[0043] To clearly illustrate the technical features of this solution, the following is an elaboration of this solution through specific implementation modes.

[0044] Refer to the appendix Figures 1-12, the automatic cutting method of the interlayer insulating paper of the high-voltage wire coil of the present invention, and the equipment used includes a bracket 1 located on one side of the coil.

[0045] The bracket 1 moves axially along the coil through a drag chain 3. Two main boards 4 are also connected to the bracket 1, which are slidably connected axially along the coil and arranged in the height direction. A main slider is fixedly connected to the upper main board 4, and a main slide rail slidably connected to the main slider is fixedly connected to the lower main board 4. A roller for the upper insulating paper to bypass is provided on the upper main board 4, and a roller for the lower insulating paper to bypass is provided on the lower main board 4. A power device for driving the upper main board 4 to slide axially along the coil is also provided on the bracket 1, and the power device includes a cylinder.

[0046] A paper-cutting cylinder 7 that moves axially along the coil is provided on the main board 4. A corresponding paper-cutting knife 5 inserted into the corresponding insulating paper is provided at the extending end of the paper-cutting cylinder 7. A baffle 6 is also provided on the main board 4, and the paper-cutting knife 5 is located between the baffle 6 and the main board 4.

[0047] The paper-cutting cylinder 7 is fixedly connected to a third slider 23. The third slider 23 is slidably connected to a third slide rail extending axially along the coil. The third slider 23 is also fixedly connected to a fourth slider 22. A lead screw threadedly connected to the fourth slider 22 is axially connected to the bracket 1. The lead screw extends axially along the coil, and a motor 21 for driving the lead screw to rotate is also provided on the bracket 1.

[0048] A paper-cutting board 10 corresponding to the paper-cutting knife 5 is provided on the main board 4. The insulating paper passes between the paper-cutting knife 5 and the paper-cutting board 10, and a long hole 24 for the paper-cutting knife 5 to insert is provided on the paper-cutting board 10.

[0049] A pneumatic paper pressing mechanism is also provided on the main board 4. The pneumatic paper pressing mechanism includes a pneumatic cylinder 8 and a lapping plate 9 both provided on the bracket 1 and located on the upper and lower sides of the insulating paper. The pneumatic cylinder 8 extends to press the insulating paper against the lapping plate 9.

[0050] The roller includes a first guide roller 11 and a second guide roller 12 close to the coil. The first guide roller 11 is located between the coil and the second guide roller 12. The insulating paper sequentially bypasses the first guide roller 11 and the second guide roller 12 and then winds around the coil.

[0051] A first cylinder 18 for driving the lower main board 4 to move in the height direction is provided on the bracket 1. A first slide rail 16 extending in the height direction is also provided on the bracket 1. A first slide plate 17 is slidably connected to the first slide rail 16. The first slide plate 17 is bolted to the lower main board 4. The extending end of the first cylinder 18 is connected to the first slide plate 17 through a support rod 20.

[0052] The bracket 1 is further provided with a second slide rail 14 extending in the height direction. A second slider 13 is slidably connected to the second slide rail 14, and the upper main board 4 is slidably connected to the second slider 13 along the axial direction of the coil.

[0053] An automatic cutting method for the interlayer insulating paper of a transformer high-voltage wire coil includes the following steps:

[0054] a. Overlap two layers of insulating paper and stick them to the coil with tape. Then wind the head end of the coil. After winding a certain thickness of insulating paper, drive the bracket 1 to move along the axial direction of the coil, and at the same time drive the power device to drive the two main boards 4 to be misaligned, so that the upper insulating paper and the lower insulating paper are staggered and wound along the axial direction of the coil;

[0055] b. At the end of the coil, the upper insulating paper reaches the end of the coil first. At this time, the upper paper cutter 5 is inserted into the upper insulating paper and cuts along the conveying direction of the upper insulating paper. At this time, the upper paper cutter 5 and the upper insulating paper continue to move synchronously in the same direction along the axial direction of the coil. This will cause the excess insulating paper to wind outside the coil. Therefore, drive the upper paper cutter 5 to move in the reverse direction of the movement of the insulating paper, so that the width of the upper insulating paper cut off is increased, thereby ensuring that the upper insulating paper wound outside the coil is automatically cut;

[0056] c. When the lower insulating paper reaches the end of the coil, since the thickness of the insulating paper has not reached the requirement at this time, it is necessary to continue winding. At the same time, the edge of the lower insulating paper is not aligned with the end of the coil. Therefore, similarly, rely on the reverse movement of the lower paper cutter 5 to automatically cut the lower insulating paper;

[0057] d. Then drive the upper insulating paper to move along the moving direction of the upper paper cutter 5, so that the two layers of insulating paper are completely overlapped. At this time, the two layers of insulating paper just wind around the end of the coil, and the width of the two layers of insulating paper after cutting is the width of the end of the coil. Then stop the two layers of insulating paper from moving along the axial direction of the coil, and at the same time stop the movement of the upper and lower paper cutters 5, so that the two layers of insulating paper wind around the end of the coil to ensure the thickness of the insulating paper at the end of the coil;

[0058] e. When the insulating paper reaches the required thickness, stop winding the two layers of insulating paper. Then use the upper pneumatic paper pressing mechanism and the lower pneumatic paper pressing mechanism to clamp the upper and lower layers of insulating paper respectively, and then manually cut off the insulating paper, and use tape to stick the tail ends of the two layers of insulating paper to the coil.

[0059] Certainly, the above description is not limited to the above examples. The technical features not described in the invention can be implemented by or using the prior art, which will not be elaborated here. The above embodiments and the accompanying drawings are only used to illustrate the technical solutions of the invention and are not a limitation on the invention. The invention has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions, or substitutions made by those of ordinary skill in the technical field within the scope of the essence of the invention do not depart from the purpose of the invention and should also fall within the scope of protection of the claims of the invention.

Claims

1. A method for automatically cutting insulating paper between layers of transformer high-voltage wires, characterized in that: The following steps are involved: a. The upper insulating paper and the lower insulating paper are arranged alternately and wound along the axial direction of the coil; b. At the end of the coil, the upper insulating paper reaches the end of the coil first, and the upper paper cutter (5) is inserted into the upper insulating paper and cuts along the conveying direction of the upper insulating paper. At this time, the upper paper cutter (5) and the upper insulating paper continue to move synchronously in the same direction along the axial direction of the coil, which will cause excess insulating paper to be wound around the outside of the coil. Therefore, the upper paper cutter (5) is driven to move in the opposite direction of the movement of the insulating paper, so that the width of the upper insulating paper cut off is increased, thereby ensuring that the upper insulating paper wound around the outside of the coil is automatically cut; c. When the lower layer of insulating paper reaches the end of the coil, the thickness of the insulating paper has not yet reached the required level, so it needs to be wound further. At the same time, the edge of the lower layer of insulating paper is not aligned with the end of the coil. Therefore, similarly, the lower layer of insulating paper is automatically cut by the reverse movement of the lower layer of paper cutter (5); d. Then, the upper insulating paper is driven to move along the moving direction of the upper paper cutter (5) so that the two layers of insulating paper are completely overlapped. At this time, the two layers of insulating paper are just wound around the end of the coil, and the width of the two layers of insulating paper after cutting is the width of the end of the coil. Then, the two layers of insulating paper are stopped from moving along the axial direction of the coil, and the movement of the upper and lower paper cutters (5) is stopped at the same time, so that the two layers of insulating paper are wound around the end of the coil to ensure the thickness of the insulating paper at the end of the coil; e. When the insulating paper reaches the required thickness, stop winding the two layers of insulating paper, and then use the upper pneumatic paper pressing mechanism and the lower pneumatic paper pressing mechanism to clamp the upper and lower layers of insulating paper respectively, and then manually cut the insulating paper, and use tape to stick the tail ends of the two layers of insulating paper to the coil.

2. The method for automatically cutting insulating paper between layers of transformer high-voltage wires according to claim 1, characterized in that: There is a certain distance between the insertion point of the paper cutter (5) into the insulating paper and the edge of the insulating paper.

3. The method for automatically cutting insulating paper between layers of transformer high voltage wires according to claim 2, characterized in that: A support (1) is provided on one side of the coil, the support (1) moves along the axial direction of the coil, and the support (1) is also connected to two main boards (4) which are slidably connected along the axial direction of the coil and arranged along the height direction, the upper main board (4) is provided with a roller for the upper insulating paper to pass around, and the lower main board (4) is provided with a roller for the lower insulating paper to pass around, and the support (1) is also provided with a power device for driving the upper main board (4) to slide along the axial direction of the coil.

4. The method for automatically cutting insulating paper between layers of transformer high-voltage wires according to claim 3 is characterized in that: The main board (4) is provided with a paper cutting cylinder (7) that moves along the axial direction of the coil, and a corresponding paper cutting knife (5) that is inserted into the corresponding insulating paper is provided on the extended end of the paper cutting cylinder (7).

5. The method for automatically cutting insulating paper between layers of transformer high-voltage wires according to claim 4 is characterized in that: The main board (4) is provided with a paper cutting board (10) arranged corresponding to the paper cutting knife (5); the insulating paper passes between the paper cutting knife (5) and the paper cutting board (10); and the paper cutting board (10) is provided with a long hole (24) for inserting the paper cutting knife (5).

6. The method for automatically cutting insulating paper between layers of transformer high-voltage wires according to claim 1, characterized in that: The pneumatic paper pressing mechanism comprises a pneumatic cylinder (8) and a lap plate (9) both of which are arranged on the bracket (1) and located on the upper and lower sides of the insulating paper, and the pneumatic cylinder (8) extends to press the insulating paper onto the lap plate (9).

7. The method for automatically cutting insulating paper between layers of transformer high-voltage wires according to claim 3, characterized in that: The rotating roller comprises a first guide roller (11) and a second guide roller (12) close to the coil, the first guide roller (11) being located between the coil and the second guide roller (12), and the insulating paper is wound around the coil after passing through the first guide roller (11) and the second guide roller (12) in sequence.

8. The method for automatically cutting insulating paper between layers of transformer high-voltage wires according to claim 3, characterized in that: The support (1) is provided with a first cylinder (18) for driving the lower main board (4) to move in the height direction.

9. The method for automatically cutting insulating paper between layers of transformer high voltage wires according to claim 8, characterized in that: The bracket (1) is also provided with a second slide rail (14) extending in the height direction, a second slider (13) is slidably connected to the second slide rail (14), and the upper main board (4) is slidably connected to the second slider (13) along the axial direction of the coil.

10. The method for automatically cutting insulating paper between layers of transformer high voltage wires according to claim 3, characterized in that: The main board (4) is also provided with a baffle (6), and the paper cutter (5) is located between the baffle (6) and the main board (4).

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