Automatic cutting method for insulation paper between transformer high-voltage wire claddings

Abstract

The invention relates to a method for automatically cutting insulation paper between high-voltage line cladding layers of a transformer, which is characterized in that a wider paper tape is automatically cut into narrow paper tapes through a paper cutter for winding end insulation, so that the selection range of layer insulation is wider, the end insulation can be narrower, the winding effect is better, and the production cost is also reduced; through the arrangement that the paper cutter is inserted into the insulation paper, the insulation paper can be conveniently cut when the paper cutter moves in the axial direction of the coil, the paper cutter is prevented from cutting the insulation paper from one side of the insulation paper, and therefore the insulation paper and the paper cutter are extruded, and part of the insulation paper cannot be cut; through the arrangement of a rotating roller, the insulation paper is guided, and meanwhile, through the arrangement of a power device, relative sliding of the two layers of main boards is conveniently achieved; through the arrangement of the paper cutting plate, the insulation paper crosses over the paper cutting plate from the top surface of the paper cutting plate, and when the paper cutter moves downwards to pierce the insulation paper, the paper cutting plate plays a role in supporting the insulation paper.

Description

Technical Field

[0001] The invention relates to the field of transformers, in particular to the field of insulating paper winding technology, and specifically refers to a method for automatically cutting insulating paper between sheaths of high-voltage wires of transformers. Background Art

[0002] The entire coil of the oil-immersed transformer is immersed in transformer oil for insulation and heat dissipation. Usually, the conductor of the high-voltage coil is made of paper-wrapped wire or enameled wire with insulating coating. Since the high-voltage coil has many turns, it is usually wound in multiple layers. At the same time, due to the high voltage between layers, insulating paper is usually added between layers.

[0003] The newer process is to use a paper tape of a certain width for winding. Since the end insulation is also wound with the paper tape, and the width of the end insulation cannot be too wide due to cost and process restrictions. Although the existing solution also has an end insulation compensation device, in many cases the operator will give up using the compensation device and instead manually compensate the end insulation, which reduces production efficiency. Designers also have great limitations in choosing the width of the paper tape, which also increases the difficulty of coil design. Summary of the invention

[0004] The invention aims at the deficiencies of the prior art and provides an automatic cutting method for insulating paper between layers of transformer high-voltage line sheaths. A paper cutter is used to automatically cut a wider paper tape into a narrow paper tape for winding the end insulation, so that the layer insulation has a wider selection range. At the same time, the end insulation can be narrower, the winding effect is better, and the production cost is reduced.

[0005] The invention discloses an automatic cutting method for insulating paper between sheaths of transformer high-voltage wires, comprising the following steps: 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. At this time, the upper paper cutter is inserted into the upper insulating paper and cut 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 excess insulating paper to be wound around the outside of the coil. Therefore, the upper paper cutter 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 requirement, 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. 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 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 coil end. 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 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 cut the insulating paper manually, 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 of the paper cutter into the insulating paper and the edge of the insulating paper.

[0006] The configuration of this preferred solution facilitates cutting the insulating paper when the paper cutter moves in the axial direction of the coil, thereby preventing the paper cutter from cutting the insulating paper from one side of the insulating paper, thereby squeezing the insulating paper and the paper cutter so that part of the insulating paper cannot be cut.

[0007] Preferably, a bracket is arranged on one side of the coil, and the bracket moves along the axial direction of the coil. The bracket is also connected to two main boards which are slidably connected along the axial direction of the coil and arranged along the height direction. The upper main board is provided with a roller for the upper insulating paper to bypass, and the lower main board is provided with a roller for the lower insulating paper to bypass. The bracket is also provided with a power device for driving the upper main board to slide along the axial direction of the coil.

[0008] When this preferred solution is in use, the setting of the rotating roller provides a guiding effect on the insulating paper, and the setting of the power device facilitates the relative sliding of the two layers of the main board.

[0009] Preferably, the main board is provided with a paper cutting cylinder which moves along the axial direction of the coil, and a corresponding paper cutting knife which is inserted into the corresponding insulating paper is provided on the extended end of the paper cutting cylinder.

[0010] This preferred solution facilitates driving the paper cutter to move along the axial direction of the coil by providing a paper cutting cylinder.

[0011] Preferably, a cutting board corresponding to the paper cutter is provided on the main board, the insulating paper passes between the paper cutter and the cutting board, and a long hole for inserting the paper cutter is provided on the cutting board.

[0012] In this preferred solution, the cutting paper is arranged so that the insulating paper crosses the cutting paper from the top surface of the cutting paper, and plays a role of supporting the insulating paper when the paper cutter moves downward to pierce the insulating paper.

[0013] Preferably, the pneumatic paper pressing mechanism comprises a pneumatic cylinder and a lap plate, both of which are arranged on a bracket and located on the upper and lower sides of the insulating paper, and the pneumatic cylinder extends to press the insulating paper onto the lap plate.

[0014] In this preferred solution, when the insulating paper is cut, the pneumatic cylinder is driven to press the insulating paper onto the lap plate, thereby facilitating manual cutting of the insulating paper.

[0015] Preferably, the rotating roller comprises a first guide roller and a second guide roller close to the coil, the first guide roller is located between the coil and the second guide roller, and the insulating paper is wound around the coil after passing around the first guide roller and the second guide roller in sequence.

[0016] The arrangement of this preferred solution facilitates the tensioning of the insulating paper.

[0017] Preferably, the bracket is provided with a first cylinder for driving the lower mainboard to move in the height direction.

[0018] This preferred solution facilitates the movement of the two main boards in height by setting the first cylinder, thereby facilitating the winding of the insulating paper on the coil.

[0019] Preferably, the bracket is further provided with a second slide rail extending in the height direction, a second slider is slidably connected to the second slide rail, and the upper mainboard is slidably connected to the second slider along the axial direction of the coil.

[0020] This preferred solution provides a guiding function for the main board when it moves in the height direction by disposing the second sliding block and the second sliding rail.

[0021] Preferably, a baffle is further provided on the main board, and the paper cutter is located between the baffle and the main board.

[0022] This preferred solution facilitates the protection of the paper cutter by setting the baffle.

[0023] The beneficial effects of the invention are as follows: a wider paper tape is automatically cut into narrow paper tapes by a paper cutter for winding the end insulation, so that the selection range of layer insulation is wider, and the end insulation can be narrower, the winding effect is better, and the production cost is reduced; the setting of the paper cutter inserted into the insulating paper facilitates the paper cutter to cut the insulating paper when it moves in the axial direction of the coil, and avoids the paper cutter cutting the insulating paper from one side of the insulating paper, so that the insulating paper and the paper cutter are squeezed so that part of the insulating paper cannot be cut; the setting of the rotating roller gives the insulating paper a guiding effect, and the setting of the power device facilitates the relative sliding of the two layers of the main board; the setting of the cutting board allows the insulating paper to cross the cutting board from the top surface of the 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

[0024] Figure 1It is a schematic diagram of the invention structure; Figure 2 It is a three-dimensional schematic diagram of the bracket; Figure 3 It is a three-dimensional schematic diagram of the main board; Figure 4 for Figure 3 A schematic diagram of the main view; Figure 5 for Figure 3 Schematic diagram of top view; Figure 6 for Figure 3 Schematic diagram of the left side; Figure 7 for Figure 3 A rear view schematic diagram of Figure 8 This is an enlarged schematic diagram of the main board when the insulation paper is wound; Fig. 9 This is an enlarged diagram of the paper cutter; Fig.10 for Figure 3 A three-dimensional schematic diagram from another angle; Fig.11 for Figure 3 A three-dimensional schematic diagram from another angle; Fig.12 It is a schematic diagram of the front view of the tip of the paper cutter; As shown in the figure: 1. Bracket, 2. Center roller of coil, 3. Drag chain, 4. Main board, 5. Paper cutter, 6. Baffle, 7. Paper cutting cylinder, 8. Pneumatic cylinder, 9. Lap 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 joint of two layers of main board, 20. Support rod, 21. Motor, 22. Fourth slider, 23. Third slider, 24. Long hole. DETAILED DESCRIPTION

[0025] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0026] Refer to the attached Figure 1-12 The invention discloses an automatic cutting method for insulating paper between sheaths of a transformer high-voltage line. The equipment used in the method includes a bracket 1 located at one side of the coil.

[0027] The bracket 1 moves along the axial direction of the coil through the drag chain 3. The bracket 1 is also connected to two main boards 4 that are slidably connected along the axial direction of the coil and arranged along the height direction. The upper main board 4 is fixedly connected to a main slider, and the lower main board 4 is fixedly connected to a main slide rail that is slidably connected to the main slider. The upper main board 4 is provided with a roller for the upper insulating paper to bypass, and the lower main board 4 is provided with a roller for the lower insulating paper to bypass. The bracket 1 is also provided with a power device that drives the upper main board 4 to slide along the axial direction of the coil, and the power device includes a cylinder.

[0028] The main board 4 is provided with a paper cutting cylinder 7 which moves along the axial direction of the coil, and the protruding end of the paper cutting cylinder 7 is provided with a corresponding paper cutting knife 5 which is inserted into the corresponding insulating paper. The main board 4 is also provided with a baffle 6, and the paper cutting knife 5 is located between the baffle 6 and the main board 4.

[0029] The paper cutting cylinder 7 is fixedly connected to the third slider 23, the third slider 23 is slidably connected to the third slide rail extending along the axial direction of the coil, the third slider 23 is also fixedly connected to the fourth slider 22, a lead screw threadedly connected to the fourth slider 22 is axially connected to the bracket 1, the lead screw extends along the axial direction of the coil, and the bracket 1 is also provided with a motor 21 for driving the lead screw to rotate.

[0030] A cutting board 10 is provided on the main board 4 and is arranged corresponding to the paper cutter 5 . The insulating paper passes between the paper cutter 5 and the cutting board 10 . A long hole 24 is provided on the cutting board 10 for the paper cutter 5 to be inserted.

[0031] A pneumatic paper pressing mechanism is also provided on the main board 4 , and the pneumatic paper pressing mechanism includes 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. The pneumatic cylinder 8 extends to press the insulating paper onto the lap plate 9 .

[0032] The rotating roller includes a first guide roller 11 and a second guide roller 12 close to the coil, wherein the first guide roller 11 is 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.

[0033] The bracket 1 is provided with a first cylinder 18 for driving the lower main board 4 to move in the height direction. The bracket 1 is also provided with a first slide rail 16 extending in the height direction. The first slide rail 16 is slidably connected with a first slide plate 17. The first slide plate 17 is bolted to the lower main board 4. The protruding end of the first cylinder 18 is connected to the first slide plate 17 through a support rod 20.

[0034] The bracket 1 is also provided with a second slide rail 14 extending in the height direction, the second slide rail 14 is slidably connected with a second slider 13, and the upper main board 4 is slidably connected with the second slider 13 along the axial direction of the coil.

[0035] The invention discloses an automatic cutting method for insulating paper between sheaths of transformer high-voltage wires, comprising the following steps: a. Overlap two layers of insulating paper and stick them on the coil with tape, then wind the head end of the coil. After a certain thickness of insulating paper is wound, 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 dislocated, so that the upper insulating paper and the lower insulating paper are staggered 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. At this time, the upper paper cutter 5 is inserted into the upper insulating paper and cut 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 insulating paper reaches the end of the coil, the thickness of the insulating paper has not yet reached the requirement, so it needs to be wound further. 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 5. 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 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 coil end. 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 are wound around the coil end to ensure the thickness of the insulating paper at the coil end; 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.

[0036] Of course, the above description is not limited to the above examples. Technical features not described in the invention can be achieved by or by using existing technologies, which will not be repeated here. The above embodiments and drawings are only used to illustrate the technical scheme of the invention and are not limitations of the invention. The invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the invention do not deviate 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 1, 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 1, 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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