Transformer coil tightening method

Abstract

The invention belongs to the field of coil winding, and relates to a transformer coil tightening method, which comprises the following steps of: designing the length of a main body clamping piece according to the radial size of a coil cake, designing the length of a strip-shaped positioning waist hole formed in the middle position of the upper part of the vertical side surface of an L-shaped clamping piece according to the height of a coil, and forming a V-shaped groove I in the main body clamping piece; a second V-shaped groove corresponding to the first V-shaped groove is formed in the auxiliary clamping piece, and a dovetail groove formed by the first V-shaped groove and the second V-shaped groove is matched with the section of the vertical supporting strip. The main body clamping piece is placed on the surface of the wire cake, and the first V-shaped groove and the second V-shaped groove are attached to each other and clamp the vertical supporting strip; the horizontal side face of the bottom of the L-shaped clamping piece is placed at the bottom of the coil, and the main body clamping piece and the L-shaped clamping piece are fixed; tension is applied to tighten the wire, the vertical supporting strip provides limiting support for the inner end of the main body clamping piece, and the main body clamping piece and the L-shaped clamping piece are matched to provide radial limiting for the wire. Components used in the device are convenient to adjust, disassemble and assemble, the lead can be prevented from being broken, and the labor intensity of operators is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of coil winding, and in particular relates to a transformer coil tightening method, which is used for radially limiting a conductor during the coil tightening process. Background Art

[0002] The coil is the core component of the transformer, and the tightness of the coil wire is very critical. Therefore, during the coil winding process, in order to meet the requirements of coil radial flatness and wire tightness, the coil wire needs to be tightened vigorously. During the coil tightening process, some wires are prone to collapse, that is, the wound wires bulge upward and shift horizontally under the action of a large tensile force, especially for transformer coils with large radial directions. The phenomenon of wire collapse is more obvious and common when the coil is tightened.

[0003] At present, during the winding process of transformer coils, the coil tightening needs to be operated by a dedicated person, which is repetitive and labor-intensive. In order to prevent the wire from collapsing when the coil is tightened, the current method mainly uses a nylon hammer or nylon plate to press or hit the wire as the coil is tightened to prevent the wire from collapsing. This operation method not only occupies a large number of people, but also affects the purification environment of the production workshop.

[0004] Therefore, according to the demand for transformer production capacity growth and industry development trends, it is necessary to find a transformer coil tightening method that can prevent the wire from collapsing. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a transformer coil tightening method, and the technical solution adopted by the present invention is as follows: A transformer coil tightening method, after a layer of coils is wound, a tension is applied to the conductor of the coil layer to tighten the coil, comprising the following steps: The length of the main body clamp is designed according to the radial size of the wire cake, and the main body clamp is a long quadrangular prism, so that the lower surface of the main body clamp in the length direction can cover all the wires in the radial direction; The length of the long strip positioning waist hole provided in the middle of the upper part 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; A step 1 and a step 2 are provided in the height direction from the rear side surface to the front side surface at the inner end of the main clamp, a V-shaped groove 1 is provided in the height direction at the inner edge position of the outer end of the step 2, a V-shaped groove 2 corresponding to the V-shaped groove 1 is provided at the edge of the auxiliary clamp of the rectangular plate structure, and the V-shaped groove 1 and the 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 the V-shaped groove 1 and the V-shaped groove 2 can match the cross-sectional shape of the vertical support bar; Place the main clamp on the surface of the coil, place one side edge of the auxiliary clamp against step one, install the middle part of the auxiliary clamp on step two through a detachable structure, and make the V-shaped groove one and V-shaped groove two fit together and clamp 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; Apply tension to tighten the wire, and the vertical support bar provides limit 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 cooperate to provide radial limit for the wire of the wire coil to prevent the wire from collapsing during the tightening process of the coil.

[0006] Preferably, stud one is installed at the center position of the outer end of the main clamp, and stud one passes through the positioning waist hole of the L-shaped clamp. The position of stud one is adjusted in the positioning waist hole so that after the lower surface of the main clamp presses the wire, butterfly nut one is screwed into stud one and tightened; stud two is installed at the center position of the plane in the length direction of step two, and a through hole is opened at the position of the auxiliary clamp corresponding to stud two, and after stud two passes through the through hole, butterfly nut two is screwed into and tightened.

[0007] Preferably, circular recessed holes are respectively provided at the center position of the outer end surface of the main body clamp and the center position of the plane in the second length direction of the step, and the first end and the second end of the stud are inserted into the circular recessed holes and fixed by welding.

[0008] Preferably, an internal threaded hole is respectively provided at the center position of the outer end surface of the main body clamp and the center position of the plane in the length direction of the second step, and the first end and the second end of the stud are screwed into the internal threaded hole and tightened.

[0009] Preferably, a rectangular weight-reducing groove is provided on the side of the main body clamp from step 1 to the outer end of the main body clamp, and the cross-section of the weight-reducing groove is set to a U-shaped structure.

[0010] Preferably, a rectangular weight-reducing notch is provided in the middle of the horizontal side surface of the L-shaped clamp.

[0011] Beneficial effects of the present invention: The auxiliary clamps and L-shaped clamps are installed on the main clamps through a detachable structure, which is convenient for adjustment and disassembly; the designed step and dovetail groove structure can achieve the ingenious positioning of the inner end of the tooling; it can effectively reduce the labor intensity of operators, reduce labor costs, and improve product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1A front cross-sectional view of a transformer coil tightening method in use according to an embodiment of the present invention; Figure 2 A top view of a transformer coil tightening method according to an embodiment of the present invention; Figure 3 is a top view of an L-shaped clamp according to an embodiment of the present invention; Figure 4 It is a right side view of the L-shaped clamp of the embodiment of the present invention; Figure 5 A top view of a main body clamp according to an embodiment of the present invention; Figure 6 It is a rear view of the main body clamp of the embodiment of the present invention; Figure 7 for Figure 6 The cross-sectional view at BB in FIG. In the figure, 1-wire cake, 2-main body clamp, 3-butterfly nut one, 4-stud one, 5-L-type clamp, 6-butterfly nut two, 7-auxiliary clamp, 8-positioning waist hole, 9-weight reduction notch, 10-stud two, 11-step one, 12-step two, 13-V-shaped groove one, 14-weight reduction groove, 15-V-shaped groove two. DETAILED DESCRIPTION

[0013] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0014] like Figure 1-7 As shown, a transformer coil tightening method comprises the following steps: ① According to the cross-sectional shape and size of the vertical support bar of the coil, the shape and size of the V-groove 13 of the main clamp 2 and the V-groove 2 15 of the auxiliary clamp 7 are designed. The shapes and sizes of the V-groove 13 and the V-groove 2 15 match each other to ensure that the combination of the V-groove 13 and the V-groove 2 15 forms a dovetail groove structure that matches the vertical support bar on the outer periphery of the cardboard tube, avoiding damage to the vertical support bar when fixing the main clamp 2 and the auxiliary clamp 7.

[0015] The vertical support bars are evenly bonded to the outer circumference of the cardboard tube. The overall structure of the main body clamp 2 is a long quadrangular prism. The length direction of the main body clamp 2 in the use state is horizontal, and the height of the main body clamp 2 is greater than the width; the left end of the main body clamp 2 is provided with a step 11 and a step 2 12 in the height direction from the rear side to the front side, and the height of the step 11 is greater than the height of the step 2 12. A V-shaped groove 13 in the height direction is provided at the inner edge of the outer end of the step 2 12 at the left end of the main body clamp 2, and a rectangular weight-reducing groove 14 is provided on the rear side of the main body clamp 2 from the step 11 to the right end. The cross-section of the weight-reducing groove 14 is a U-shaped structure. On the one hand, the weight-reducing groove 14 can reduce the weight of the main body clamp 2 without affecting the bending strength, and at the same time, it serves as a fulcrum to facilitate the transportation of the main body clamp 2.

[0016] The overall structure of the auxiliary clamp 7 is a rectangular plate, and a V-shaped groove 2 15 is provided at a position on the edge of the auxiliary clamp 7 corresponding to the V-shaped groove 13 .

[0017] ② A long strip-shaped positioning waist hole 8 is opened in the upper middle position of the right vertical side surface of the L-shaped clamp 5. Considering the number of layers of the coil coil 1 (coil height), a suitable length of the positioning waist hole 8 on the L-shaped clamp 5 is designed to meet the use requirements of different numbers of coils.

[0018] ③ According to the radial size of the wire coil 1, design a suitable length of the main clamp 2 to ensure that the lower surface of the main clamp 2 can cover all radial wires.

[0019] ④ Place the main clamp 2 and the auxiliary clamp 7 so that the V-shaped groove 13 and the V-shaped groove 2 15 fit together and clamp the vertical support bar, and fix the auxiliary clamp 7 and the main clamp 2 into one piece through the butterfly nut 2 6; place the L-shaped clamp 5, and fix the main clamp 2 and the L-shaped clamp 5 into one piece through the butterfly nut 1 3.

[0020] A stud 14 is fixedly installed at the center position of the right end face of the main body clamp 2, and a stud 2 10 is fixedly installed at the center position of the length direction plane of the step 2 12. There are two types of fixing and installing structures of the stud 14 and the stud 2 10. One is to machine a circular concave hole at the corresponding position of the main body clamp 2, and the stud 14 and the stud 2 10 are inserted into the circular concave hole and welded and fixed; the other is to machine an internal threaded hole at the corresponding position of the main body clamp 2, and the stud 14 and the stud 2 10 are screwed into the internal threaded hole and tightened.

[0021] After the stud 14 passes through the positioning waist hole 8, the stud 14 is adjusted to a proper position in the positioning waist hole 8, and the butterfly nut 13 is screwed into the stud 14 and tightened to fix the L-shaped clamp 5 to the main clamp 2. A rectangular weight-reducing notch 9 is provided in the middle of the bottom horizontal side of the L-shaped clamp 5, and the left side of the weight-reducing notch 9 is opened to the left edge of the L-shaped clamp 5 and penetrates. The weight-reducing notch 9 can not only reduce the weight of the L-shaped clamp 5, but also can serve as a fulcrum to facilitate the carrying of the L-shaped clamp 5.

[0022] The auxiliary clamp 7 is provided with a through hole corresponding to the position of the second stud 10, and the right end of the auxiliary clamp 7 is fitted into the step 11, and the step 11 provides support force for the right end of the auxiliary clamp 7. After the second stud 10 passes through the through hole, the butterfly nut 2 6 is screwed into the second stud 10 and tightened to fix the auxiliary clamp 7 to the main clamp 2.

[0023] The main body clamp 2 can also adopt an integral casting process to form the weight-reducing groove 14, which can save raw materials.

[0024] ⑤ During the coil winding process, after one layer of wire coil is wound, when tension is applied to tighten the wire, the vertical support bar provides a limiting support for the inner end of the main clamp 2 to ensure that the main clamp 2 does not move horizontally. The main clamp 2 and the L-shaped clamp 5 cooperate to provide radial limiting for the wire of the wire coil 1 to prevent the wire from collapsing during the tightening of the coil.

[0025] In the embodiment of the present invention, butterfly nuts 1 3 and butterfly nuts 2 6 are used. The butterfly nuts are convenient for adjusting the clamping force. Gradually tightening the butterfly nuts can slowly increase the tightening force, which is smoother than the original pressing hammer method (impact) force application, and effectively prevents the wire from collapsing. The positioning waist hole 8 opened on the L-shaped clamp 5 allows the upper and lower positions of the main clamp 2 relative to the L-shaped clamp 5 to be adjusted, which is suitable for transformer coils of different heights. The main clamp 2, auxiliary clamp 7 and L-shaped clamp 5 and other components are arranged in a reasonable position to ensure that the wire can be automatically prevented from collapsing during the coil tightening process.

[0026] A transformer coil tightening method provided by an embodiment of the present invention uses tightening components that can be taken at any time and disassembled flexibly and conveniently. The method can be applied to transformer and reactor coil winding and tightening processes, effectively preventing the wire from collapsing when tightening the coil, and greatly reducing the labor intensity of operators.

[0027] In the embodiments of the present invention, technical features that are not described in detail are all existing technologies or conventional technical means and will not be described in detail here.

[0028] Finally, it should be noted that the above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them, and the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any technician familiar with the technical field can modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention.

Claims

1. A method for tightening a transformer coil, after a layer of coils is wound, a tension is applied to the conductor of the coil layer to tighten it, characterized in that: The following steps are involved: The length of the main body clamp is designed according to the radial size of the wire cake, and the main body clamp is a long quadrangular prism, so that the lower surface of the main body clamp in the length direction can cover all the wires in the radial direction; The length of the long strip positioning waist hole provided in the middle of the upper part 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; A step 1 and a step 2 are provided in the height direction from the rear side surface to the front side surface at the inner end of the main clamp, a V-shaped groove 1 is provided in the height direction at the inner edge position of the outer end of the step 2, a V-shaped groove 2 corresponding to the V-shaped groove 1 is provided at the edge of the auxiliary clamp of the rectangular plate structure, and the V-shaped groove 1 and the 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 the V-shaped groove 1 and the V-shaped groove 2 can match the cross-sectional shape of the vertical support bar; Place the main clamp on the surface of the coil, place one side edge of the auxiliary clamp against step one, install the middle part of the auxiliary clamp on step two through a detachable structure, and make the V-shaped groove one and V-shaped groove two fit together and clamp 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; Apply tension to tighten the wire, and the vertical support bar provides limiting support for the inner end of the main clamp. The main clamp and the L-shaped clamp cooperate to provide radial limiting for the wire of the wire cake.

2. A transformer coil tightening method according to claim 1, characterized in that: Install stud one at the center position of the outer end of the main clamp, and stud one passes through the positioning waist hole of the L-shaped clamp. Adjust the position of stud one in the positioning waist hole so that the lower surface of the main clamp presses the wire, and then screw butterfly nut one on stud one and tighten it; install stud two at the center position of the plane in the length direction of step two, open a through hole at the position of the auxiliary clamp corresponding to stud two, and screw butterfly nut two into it after stud two passes through the through hole and tighten it.

3. A transformer coil tightening method according to claim 2, characterized in that: A circular concave hole is respectively provided at the center position of the outer end surface of the main body clamp and the center position of the plane in the length direction of the second step, and the first end and the second end of the stud are inserted into the circular concave hole and fixed by welding.

4. A transformer coil tightening method according to claim 2, characterized in that: An internal threaded hole is respectively provided at the center position of the outer end surface of the main body clamp and the center position of the plane in the length direction of the second step, and the first end and the second end of the stud are screwed into the internal threaded hole and tightened.

5. The transformer coil tightening method according to claim 1, characterized in that: A rectangular weight-reducing groove is provided on the side of the main body clamp from the step 1 to the outer end of the main body clamp, and the cross section of the weight-reducing groove is set to a U-shaped structure.

6. A transformer coil tightening method according to claim 1, characterized in that: A rectangular weight-reducing notch is provided in the middle of the horizontal side surface of the L-shaped clamp.

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