A method for tightening transformer coil

Abstract

This invention belongs to the field of coil winding and relates to a method for tightening transformer coils. The length of the main clamp is designed based on the radial dimensions of the coil, and the length of the elongated positioning hole located at the upper middle position of the vertical side of the L-shaped clamp is designed based on the coil height. A V-shaped groove is formed on the main clamp, and a corresponding V-shaped groove is formed on the auxiliary clamp. The dovetail groove formed by the V-shaped grooves matches the cross-section of the vertical support bar. The main clamp is placed on the surface of the coil, so that the V-shaped grooves fit together and lock the vertical support bar. The bottom horizontal side of the L-shaped clamp is placed on the bottom of the coil, fixing the main clamp and the L-shaped clamp. A pulling force is applied to tighten the conductor. The vertical support bar provides limiting support for the inner end of the main clamp, and the main clamp and the L-shaped clamp cooperate to provide radial limiting for the conductor. The components used in this invention are easy to adjust and disassemble, preventing conductor breakage and reducing the labor intensity of operators.

Description

Technical Field

[0001] This invention belongs to the field of coil winding technology, specifically relating to a method for tightening transformer coils, used to radially limit the conductors during the coil tightening process. Background Technology

[0002] As the core component of a transformer, the tightness of the coil conductors is crucial. Therefore, during the coil winding process, in order to meet the requirements of radial flatness and conductor tightness, the coil conductors need to be tightened vigorously. During the tightening process, some conductors are prone to breakage, that is, the already wound conductors bulge upwards and shift horizontally under a large tensile force. This breakage phenomenon is more obvious and common in transformer coils with a large radial direction.

[0003] Currently, during the winding process of transformer coils, coil tightening requires specialized personnel, which is repetitive and labor-intensive. To prevent conductor breakage during coil tightening, the current method mainly involves manually pressing or tapping the conductor with a nylon hammer or nylon plate while applying tension to tighten the coil. This method not only requires a large number of personnel but also affects the cleanliness of the production workshop.

[0004] Therefore, based on the increasing demand for transformer production capacity and industry development trends, it is necessary to find a method for tightening transformer coils that can prevent conductor collapse. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a method for tightening transformer coils. The technical solution adopted by the present invention is as follows:

[0006] A method for tightening transformer coils involves applying tension to the conductors of a coil layer after winding, and includes the following steps:

[0007] The length of the main clamp is designed according to the radial dimension of the wire disc. The main clamp is a long quadrangular prism, so that the lower surface of the main clamp in the longitudinal direction can cover all the wires in the radial direction.

[0008] The length of the elongated positioning hole at the upper middle position of the vertical side of the L-shaped clamp is designed according to the height of the coil, so that after the L-shaped clamp is connected to the outer end of the main clamp, the distance between the lower surface of the main clamp and the horizontal side of the L-shaped clamp is greater than the height of the coil.

[0009] Step 1 and Step 2 are formed in the height direction from the rear side to the front side at the inner end of the main clamping part. A V-shaped groove 1 in the height direction is formed at the inner edge of the outer end of Step 2. A V-shaped groove 2 corresponding to V-shaped groove 1 is formed on the edge of the auxiliary clamping part of the rectangular plate structure. V-shaped groove 1 and V-shaped groove 2 are designed according to the cross-sectional shape and size of the vertical support bar so that the dovetail groove formed by the combination of V-shaped groove 1 and V-shaped groove 2 can match the cross-section of the vertical support bar.

[0010] Place the main clamp on the surface of the coil, and place one edge of the auxiliary clamp against step one. The middle part of the auxiliary clamp is installed on step two through a detachable structure, and the V-shaped groove one and V-shaped groove two are attached and locked together to secure the vertical support bar. Place the bottom horizontal side of the L-shaped clamp on the bottom of the coil, and use the detachable structure to fix the main clamp and the L-shaped clamp through the positioning waist hole on the L-shaped clamp.

[0011] Applying tension to tighten the conductor, the vertical support bar provides limiting support for the inner end of the main clamp to ensure that the main clamp will not move horizontally. The main clamp and the L-shaped clamp work together to provide radial limiting for the conductor of the coil, preventing the conductor from breaking off during the coil tightening process.

[0012] Preferably, a stud is installed at the center of the outer end of the main clamping member. The stud passes through the positioning hole of the L-shaped clamping member. The position of the stud is adjusted in the positioning hole so that the lower surface of the main clamping member presses the wire. Then, a wing nut is screwed into the stud and tightened. A stud is installed at the center of the plane along the length of the second step. A through hole is opened on the auxiliary clamping member at the position corresponding to the stud. The stud is passed through the through hole and then screwed into the wing nut and tightened.

[0013] Preferably, circular recesses are made at the center of the outer end face of the main clamp and at the center of the plane along the length of the second step, respectively, and the first and second ends of the stud are inserted into the circular recesses and welded to fix them.

[0014] Preferably, internal threaded holes are opened at the center position of the outer end face of the main body clamp and at the center position of the plane along the length direction of the second step, respectively, and the first end of the stud and the second end of the stud are screwed into the internal threaded holes and tightened for fixation.

[0015] Preferably, a rectangular weight-reducing groove is formed on the side of the main clamping member from step one to the outer end of the main clamping member, and the cross-section of the weight-reducing groove is set as a U-shaped structure.

[0016] Preferably, a rectangular weight-reducing slot is formed at the middle position of the horizontal side of the L-shaped clamp.

[0017] The beneficial effects of this invention are:

[0018] The auxiliary clamps and L-shaped clamps are installed on the main clamps via a detachable structure, facilitating adjustment and disassembly; the design of the step and dovetail groove structure achieves ingenious positioning of the tooling's inner end; it can effectively reduce the labor intensity of operators, reduce labor costs, and improve product quality. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a front cross-sectional view of a transformer coil tightening method according to an embodiment of the present invention in use.

[0021] Figure 2 This is a top view of a transformer coil tightening method according to an embodiment of the present invention;

[0022] Figure 3 This is a top view of the L-shaped clamp according to an embodiment of the present invention;

[0023] Figure 4 This is a right view of the L-shaped clamp according to an embodiment of the present invention;

[0024] Figure 5 This is a top view of the main clamping component according to an embodiment of the present invention;

[0025] Figure 6 This is a rear view of the main clamping component according to an embodiment of the present invention;

[0026] Figure 7 for Figure 6 Sectional view at BB in the middle;

[0027] In the diagram, 1-line disc, 2-main clamping piece, 3-wing nut one, 4-stud one, 5-L-shaped clamping piece, 6-wing nut two, 7-auxiliary clamping piece, 8-positioning waist hole, 9-weight reduction groove, 10-stud two, 11-step one, 12-step two, 13-V-shaped groove one, 14-weight reduction groove, 15-V-shaped groove two. Detailed Implementation

[0028] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] like Figure 1-7 As shown, a method for tightening transformer coils includes the following steps:

[0030] ① Based on the cross-sectional shape and size of the vertical support bar of the coil, design the shape and size of the V-groove 13 of the main clamp 2 and the V-groove 25 of the auxiliary clamp 7. The shape and size of the V-groove 13 and the V-groove 25 match each other to ensure that the combination of the V-groove 13 and the V-groove 25 forms a dovetail groove structure that matches the vertical support bar on the outer periphery of the cardboard tube, so as to avoid damage to the vertical support bar when fixing the main clamp 2 and the auxiliary clamp 7.

[0031] The vertical support strips are evenly bonded to the outer periphery of the cardboard tube. The main clamp 2 has an overall structure of a long quadrangular prism. In use, the length of the main clamp 2 is horizontal, and the height of the main clamp 2 is greater than its width. The left end of the main clamp 2 has two steps, one 11 and the other 12, extending from the rear side to the front side. The height of step 11 is greater than that of step 12. A V-shaped groove 13 is formed along the height direction at the inner edge of the outer end of step 12 at the left end of the main clamp 2. A rectangular weight-reducing groove 14 is formed on the rear side of the main clamp 2 from step 11 to the right end. The cross-section of the weight-reducing groove 14 is U-shaped. The weight-reducing groove 14 can reduce the weight of the main clamp 2 without affecting its bending strength, and also serves as a leverage point for easy handling of the main clamp 2.

[0032] The auxiliary clamp 7 has an overall rectangular plate structure, and a second V-shaped groove 15 is formed on the edge of the auxiliary clamp 7 at the position corresponding to the first V-shaped groove 13.

[0033] ② A long, narrow positioning hole 8 is made in the middle of the upper part of the vertical side of the right side of the L-shaped clamp 5. Considering the number of layers (coil height) of the coil coil 1, the length of the positioning hole 8 on the L-shaped clamp 5 is designed to meet the usage requirements of different coil numbers.

[0034] ③ Based on the radial dimensions of wire disc 1, design a suitable length for the main clamp 2 to ensure that the lower surface of the main clamp 2 can cover all the radial conductors.

[0035] ④ Place the main clamp 2 and the auxiliary clamp 7, so that the V-shaped groove 13 and the V-shaped groove 15 fit together and lock the vertical support bar. Use the wing nut 6 to fix the auxiliary clamp 7 and the main clamp 2 into one piece. Place the L-shaped clamp 5 and use the wing nut 3 to fix the main clamp 2 and the L-shaped clamp 5 together.

[0036] A stud 4 is fixedly installed at the center of the right end face of the main clamping member 2, and a stud 10 is fixedly installed at the center of the plane along the length direction of the step 12. There are two ways to fix the studs 4 and 10: one is to process a circular concave hole at the corresponding position of the main clamping member 2, insert the studs 4 and 10 into the circular concave hole and weld them in place; the other is to process an internal threaded hole at the corresponding position of the main clamping member 2, screw the studs 4 and 10 into the internal threaded hole and tighten them in place.

[0037] After the stud 4 passes through the positioning hole 8, adjust the stud 4 to the appropriate position in the positioning hole 8, then screw the wing nut 3 into the stud 4 and tighten it to fix the L-shaped clamp 5 to the main clamp 2. A rectangular weight-reducing slot 9 is opened in the middle of the bottom horizontal side of the L-shaped clamp 5. The left side of the weight-reducing slot 9 extends to the left edge of the L-shaped clamp 5 and passes through it. The weight-reducing slot 9 can not only reduce the weight of the L-shaped clamp 5, but also serve as a force point to facilitate the handling of the L-shaped clamp 5.

[0038] The auxiliary clamp 7 has a through hole at the position corresponding to the stud 10. The right end of the auxiliary clamp 7 is attached to the step 11, which provides support to the right end of the auxiliary clamp 7. After the stud 10 passes through the through hole, the wing nut 6 is screwed into the stud 10 and tightened to fix the auxiliary clamp 7 to the main clamp 2.

[0039] The main clamping component 2 can also be formed by integral casting to create the weight-reducing groove 14, which can save on raw materials.

[0040] ⑤ During the coil winding process, when a layer of wire is wound and tension is applied to tighten the wire, the vertical support bar provides limiting support for the inner end of the main clamp 2, ensuring that the main clamp 2 will not move horizontally. The main clamp 2 and the L-shaped clamp 5 work together to provide radial limiting for the wire of the wire of the wire cake 1, preventing the wire from breaking during the coil tightening process.

[0041] In this embodiment of the invention, wing nuts 3 and 6 are used. The wing nuts facilitate adjustment of the clamping force; gradually tightening them allows for a slow increase in tightening force, resulting in a smoother application of force compared to the original hammering method (impact), effectively preventing wire breakage. The positioning holes 8 on the L-shaped clamp 5 allow for adjustment of the vertical position of the main clamp 2 relative to the L-shaped clamp 5, suitable for transformer coils of different heights. The main clamp 2, auxiliary clamp 7, and L-shaped clamp 5 are arranged in a reasonable manner to ensure automatic prevention of wire breakage during coil tightening.

[0042] The transformer coil tightening method provided in this embodiment of the invention uses tightening components that are readily available and easy to disassemble. It can be applied to the winding and tightening processes of transformer and reactor coils, effectively preventing wire breakage during coil tightening and greatly reducing the labor intensity of operators.

[0043] In the embodiments of the present invention, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0044] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A method for tightening a transformer coil, wherein after one layer of coil is wound, a tensile force is applied to the conductor of that layer of coil to tighten it, characterized in that, Includes the following steps: The length of the main clamp is designed according to the radial dimension of the wire disc. The main clamp is a long quadrangular prism, so that the lower surface of the main clamp in the longitudinal direction can cover all the wires in the radial direction. The length of the elongated positioning hole at the upper middle position of the vertical side of the L-shaped clamp is designed according to the height of the coil, so that after the L-shaped clamp is connected to the outer end of the main clamp, the distance between the lower surface of the main clamp and the horizontal side of the L-shaped clamp is greater than the height of the coil. Step 1 and Step 2 are formed in the height direction from the rear side to the front side at the inner end of the main clamping part. A V-shaped groove 1 in the height direction is formed at the inner edge of the outer end of Step 2. A V-shaped groove 2 corresponding to V-shaped groove 1 is formed on the edge of the auxiliary clamping part of the rectangular plate structure. V-shaped groove 1 and V-shaped groove 2 are designed according to the cross-sectional shape and size of the vertical support bar so that the dovetail groove formed by the combination of V-shaped groove 1 and V-shaped groove 2 can match the cross-section of the vertical support bar. Place the main clamp on the surface of the coil, and place one edge of the auxiliary clamp against step one. The middle part of the auxiliary clamp is installed on step two through a detachable structure, and the V-shaped groove one and V-shaped groove two are attached and locked together to secure the vertical support bar. Place the bottom horizontal side of the L-shaped clamp on the bottom of the coil, and use the detachable structure to fix the main clamp and the L-shaped clamp through the positioning waist hole on the L-shaped clamp. Applying tension to tighten the conductor, the vertical support bar provides limiting support for the inner end of the main clamp, and the main clamp and L-shaped clamp cooperate to provide radial limiting for the conductor of the wire disc.

2. The transformer coil tightening method according to claim 1, characterized in that, A stud is installed at the center of the outer end of the main clamp. The stud passes through the positioning hole of the L-shaped clamp. The position of the stud is adjusted in the positioning hole so that the wire is pressed against the lower surface of the main clamp. Then, a wing nut is screwed into the stud and tightened. A stud is installed at the center of the plane along the length of the second step. A through hole is opened on the auxiliary clamp at the position corresponding to the stud. The stud is passed through the through hole and then the wing nut is screwed into it and tightened.

3. The transformer coil tightening method according to claim 2, characterized in that, Circular recesses are made at the center of the outer end face of the main clamp and at the center of the plane along the length of the second step, respectively. The first end of the stud and the second end of the stud are inserted into the circular recesses and welded to fix them.

4. A method for tightening transformer coils according to claim 2, characterized in that, Internal threaded holes are made at the center of the outer end face of the main clamp and at the center of the plane along the length of the second step, respectively. The first end of the stud and the second end of the stud are screwed into the internal threaded holes and tightened to fix them.

5. A method for tightening transformer coils according to claim 1, characterized in that, A rectangular weight-reducing groove is made on the side of the main clamping member from step one to the outer end of the main clamping member. The cross-section of the weight-reducing groove is set as a U-shaped structure.

6. A method for tightening transformer coils according to claim 1, characterized in that, A rectangular weight-reducing slot is made at the middle position of the horizontal side of the L-shaped clamp.

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