Tool for assisting in starting flat bend of coil

Abstract

The utility model discloses a tool for assisting in starting a flat bend of a coil, which comprises a fixed block, a handle and a dovetail tenon, the fixing block is connected to the end of the handle, an inverted-trapezoid-shaped groove is formed in the bottom of the fixing block, a square groove is formed above the inverted-trapezoid-shaped groove, the section of the square groove is matched with the section of a copper wire to be flattened and bent, the top edge width and the bottom edge width of the inverted-trapezoid-shaped groove are both larger than the width of the square groove, and the dovetail tenon is matched with the inverted-trapezoid-shaped groove. The clamping groove is detachably clamped in the inverted trapezoidal groove; when copper wire flat bending operation is carried out, a copper wire is clamped in the square groove, and the dovetail tenon abuts against the lower portion of the copper wire to limit the copper wire. According to the utility model, the bending of the starting end of the copper wire coil can be realized.

Description

Technical Field

[0001] The utility model relates to a tool for assisting in the flat bending of the starting end of a coil in the field of coil production. Background Art

[0002] At present, when producing coils, the starting end of the coil winding is bent flat, that is, manual bending or hammering is used to fix the starting end of the coil to the bolt or pressing plate on the winding mold through the starting end groove, which plays a tightening role during the winding process.

[0003] For copper bar coils, the bending method of the starting end of the coil is flat bending of copper wires, the bending angle is 90°, the winding method is parallel winding of multiple copper wires, and the copper bar lead-out wire needs to be welded to a copper bar. Therefore, it is required that the starting end of the copper wire is neat and flat. When the copper wire is flat bent, since the inner side of the copper wire is extruded and thickened, and the outer side is stretched and thinned, under the limitation of the physical properties of the copper wire, torsion is likely to occur at the bending part, resulting in a basin-shaped defect. Due to the relatively thick copper wire, it is difficult to flatten the basin shape. Even after flattening, it cannot fit tightly against the winding mold, resulting in uneven fixing of the starting end of the copper wire; and after the manually bent copper wire is flattened, the error at the bending part is large, and five copper wires cannot be arranged closely and neatly. The copper wire is relatively thick and not easy to bend, and manual bending requires a large force. The existing bending process is difficult to ensure the production quality of the coil. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a tool for assisting in the flat bending of the starting end of a coil, which can realize the bending of the starting end of a copper wire coil.

[0005] A technical solution for achieving the above purpose is: a tool for assisting in the flat bending of the starting end of a coil, including a fixed block and a handle, and further including a dovetail tenon;

[0006] The fixed block is connected to the end of the handle. A trapezoidal inverted groove is opened at the bottom of the fixed block, and a square groove is opened above the trapezoidal inverted groove. The cross-section of the square groove matches the cross-section of the copper wire to be flat bent. The top width and the bottom width of the trapezoidal inverted groove are both larger than the width of the square groove. The dovetail tenon matches the trapezoidal inverted groove and is detachably clamped in the trapezoidal inverted groove;

[0007] When performing the flat bending operation of the copper wire, the copper wire is clamped in the square groove, and the dovetail tenon abuts against the lower part of the copper wire to limit the copper wire.

[0008] Further, a phenolic board is provided between the copper wire and the dovetail tenon.

[0009] Further, the heights of dovetail tenons of different models clamped in the trapezoidal inverted groove are different.

[0010] Further, the left and right widths of the cross-section of the square groove have a fitting allowance corresponding to the cross-section width of the copper wire.

[0011] A tool for assisting the flat bending of the starting end of a coil of the present utility model can perform convenient and efficient bending operations on a copper wire coil, while reducing damage to the surface of the copper wire, preventing the copper wire from breaking when the outer side is stressed, preventing the copper wire from twisting, reducing the occurrence of basin-shaped defects during bending, and making the bending effect of the copper wire flat. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural view of a tool for assisting the flat bending of the starting end of a coil of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] In order to better understand the technical solution of the present utility model, the following will be described in detail through specific embodiments:

[0014] Please refer to Figure 1 , a tool for assisting the flat bending of the starting end of a coil of the present utility model includes a fixing block 1 and a handle 2, and also includes a dovetail tenon.

[0015] The fixing block 1 is connected to the end of the handle 2. A trapezoidal groove 31 is opened at the bottom of the fixing block, and a square groove 32 is opened above the trapezoidal groove. The cross-section of the square groove 32 matches the cross-section of the copper wire to be flat-bent, reducing damage to the surface of the copper wire; the left and right widths of the cross-section of the square groove 32 leave a fitting allowance corresponding to the cross-section width of the copper wire, so that the copper wire can be stretched and extended without breaking when the outer side is stressed. The top width and the bottom width of the trapezoidal groove are both larger than the width of the square groove. The dovetail tenon matches the trapezoidal groove and is detachably clamped in the trapezoidal groove. When performing the flat bending operation of the copper wire, the copper wire is clamped in the square groove, and the dovetail tenon abuts against the lower part of the copper wire to limit the copper wire.

[0016] For the flat bending of the copper wire at the starting end of the copper wire coil of the present utility model, the winding and bending method of a continuous pole coil is referred to. Such coils are formed by continuously bending copper wires. In order to prevent the copper wire at the bending part from showing a wavy shape, two pressing plates are used to clamp the upper and lower surfaces of the copper wire during winding. For the flat bending of the copper wire at the starting end of the copper wire coil, the present utility model is used to clamp and assist in bending at the bending part, and the specific method is as follows:

[0017] Place the copper wire in the square groove of the tool of the present utility model, and use the dovetail tenon to cooperate with the trapezoidal groove to fix the wire. If the copper wire is lower than the groove, place a plywood board between the copper wire and the dovetail tenon; if the copper wire is higher than the groove, reduce the height of the dovetail tenon so that the dovetail tenon cooperates with the square groove to apply a certain force to the copper wire and limit the torsion of the copper wire. Fixing the copper wire with the dove-shaped tenon and the trapezoidal groove can effectively prevent the copper wire from slipping; by increasing the plywood board or reducing the height of the dovetail tenon, the influence brought by the self-tolerance and dimensional allowance of the copper bar can be reduced, making the fit tight. When bending, the dove-shaped tenon can limit the movement of the copper wire in a plane, prevent the copper wire from twisting, and reduce the occurrence of the basin shape. The two sides of the trapezoidal groove are through, and the installation of the tenon is convenient.

[0018] Use two tools of the present utility model to clamp both sides of the copper wire where it needs to be bent respectively, and turn the handles so that the two handles rotate in the same plane to bend the copper wire into 90°. The handle has a large length and a long force arm, making it more labor-saving when bending. By using the long-handle tool, the small-area torsion on the copper wire is converted into a large-area torsion, which is beneficial to controlling the torsion angle and keeping the copper wire flat. Place five copper wires flat at the notch of the groove, pat the turns flat and then install the lead pressing block to clamp the lead to complete the copper wire bending operation.

[0019] Those of ordinary skill in the art in this technical field should recognize that the above embodiments are only used to illustrate the present utility model and are not used as a limitation to the present utility model. As long as it is within the scope of the substantial spirit of the present utility model, the changes and modifications to the above embodiments will fall within the scope of the claims of the present utility model.

Claims

1. A tool for assisting coil flat bending, comprising a fixing block and a handle, characterized in that: Also included are dovetail tenons; The fixing block is connected to the end of the handle, and an inverted trapezoidal groove is provided at the bottom of the fixing block, and a square groove is provided above the inverted trapezoidal groove. The cross section of the square groove matches the cross section of the copper wire to be bent, and the top and bottom widths of the inverted trapezoidal groove are both greater than the width of the square groove. The dove-shaped tenon matches the inverted trapezoidal groove and is detachably clamped in the inverted trapezoidal groove. When the copper wire is bent flat, the copper wire is clamped in the square groove, and the dove-shaped tenon contacts the bottom of the copper wire to limit the position of the copper wire.

2. A tool for assisting coil flat bending according to claim 1, characterized in that: A bakelite board is placed between the copper wire and the dove-shaped tenon.

3. A tool for assisting coil flat bending according to claim 1, characterized in that: Different models of dove-shaped tenons are clamped at different heights in the inverted trapezoidal groove.

4. A tool for assisting coil flat bending according to claim 1, characterized in that: The left and right widths of the cross section of the square groove correspond to the cross section width of the copper wire with a matching margin.

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