JP2005095901A - Transformer for welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer for welding which is small in the number of components, low in cost, easy in assembly, lightweight, and capable of preventing high temperature of the transformer by omitting a cover plate, and building a mounting block in a mold resin. <P>SOLUTION: In the transformer 8 for welding which is mounted on a gun bracket 7 of a welding gun device constituted of two side plates 10 and 11 to hold a welding gun, a primary coil, a secondary coil 15, a core 14 and a terminal 16 are molded with resin, the surface of the mold resin 17 forms an outer surface of the transformer, mounting blocks 18 and 19 are built in the mold resin, and the transformer is held by tightening the mounting block on the side plates 10 and 11 of the gun bracket by mounting bolts 12 and 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a welding transformer that is attached to a gun bracket of a welding gun apparatus constituted by two side plates that hold a welding gun.

  2. Description of the Related Art Conventionally, there is one in which a welding transformer is attached to a gun bracket of a welding gun apparatus constituted by two side plates that hold a welding gun (see, for example, Patent Document 1).

Japanese Examined Patent Publication No. 62-11950 (FIG. 3).

  By the way, in the prior art, since the cover plate is arranged on the outer surface of the holding plate that sandwiches the core and the inside is molded with the mold material, the number of parts is large and the cost is increased. It is difficult to assemble and high in weight, and there is a risk that the cover plate is heated by induction due to the high frequency of the coil and the transformer is heated.

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is to omit the cover plate and incorporate a mounting block in the mold resin. Accordingly, an object of the present invention is to provide a welding transformer that has a small number of parts, is inexpensive, can be easily assembled, is lightweight, and prevents the transformer from becoming hot.

  In order to achieve the above object, the welding transformer in the present invention has a primary coil, a secondary coil, a core, and a terminal molded with resin, and the surface of the molded resin is used as the outer surface of the transformer. A mounting block is built in the mold resin, and the mounting block is fastened to both side plates of the gun bracket by mounting bolts to hold the transformer.

  In the present invention, the primary coil, the secondary coil, the core, and the terminal are molded with resin, the surface of the molded resin is used as the outer surface of the transformer, and a mounting block is built in the molded resin. Since the mounting block is fastened to the both side plates of the gun bracket with mounting bolts to hold the transformer, the number of parts is low, the assembly is lightweight and easy to assemble, and the transformer is prevented from becoming hot. It becomes a transformer.

  1 to 3 relate to a welding transformer according to an embodiment of the present invention, FIG. 1 is a front view of a welding gun provided with the welding transformer according to the present invention, FIG. 2 is a plan view of the welding transformer, 3 is a cross-sectional view taken along the line AA in FIG.

  In the figure, reference numeral 1 denotes a welding gun. The welding gun 1 is roughly shown as a fixed arm 2, a pressure drive device 3, a movable arm 4, both electrodes 5, 6 and a robot (not shown). ) And a welding bracket 8 that holds the entire welding gun 1, and a welding transformer 8 that is held by the gun bracket 7. Reference numeral 9 denotes a part of the gun bracket 7 which is also a yoke for connecting the fixed arm 2 and the pressure driving device 3.

  The gun bracket 7 is composed of two side plates 10 and 11 of the welding gun 1, and the welding transformer 8 is held between the side plates 10 and 11 by bolts 12 and 13, respectively.

  In the welding transformer 8, the primary coil and the secondary coil 15 wound around the core 14, the input terminal 16, and the like are molded with a resin 17. The entire surface of the mold resin 17 is the outer surface of the welding transformer 8. The mold resin 17 contains metal mounting blocks 18 and 19 having mounting screw holes, and the bolts 12 and 13 from the side plates 10 and 11 are attached to the mounting blocks 18 and 19, respectively. By tightening the bolts 12 and 13 from the side plates 10 and 11 side so as to be screwed into the screw holes, the welding transformer 8 is securely held between the side plates 10 and 11.

  Reference numeral 20 denotes a rectifier, and reference numeral 21 denotes a terminal for connecting the transformer 8 and the rectifier 20.

  In the welding transformer 8 having the above-described configuration, the outer surface thereof is directly formed of the mold resin 17 without having a cover plate or mounting frame as in the conventional example. Therefore, in addition to the induction heat generated by the high frequency of the coil when the transformer 8 is operated, the mounting blocks 18 and 19 are built in the mold resin 17, so that the number of parts is small and the assembly can be performed at low cost. An easy and lightweight transformer. Since the welding transformer 8 is simply held between the side plates 10 and 11 by the bolts 12 and 13, it does not become a strength member of the welding gun 1 and therefore does not require a special strength.

  In this embodiment, the gun bracket 7 also shares the yoke 9. However, the gun 9 connected to the robot is connected to the fixed arm 2 and the pressure drive device 3 by the yoke 9. The bracket 7 may be directly fixed to the pressure driving device 3 at a different location from the yoke 9.

FIG. 1 is a front view of a welding gun equipped with a welding transformer according to the present invention. FIG. 2 is a plan view of a welding transformer according to the present invention. 3 is a cross-sectional view taken along the line AA in FIG.

Explanation of symbols

1 Welding Gun 7 Gun Bracket 8 Welding Transformer 10, 11 Side Plate 12, 13 Bolt 14 Core
15 Primary and secondary coils 16 Terminal 17 Mold resin 18, 19 Mounting block

Claims (1)

In a welding transformer to be attached to a gun bracket of a welding gun device composed of two side plates for holding a welding gun, a primary coil, a secondary coil, a core and a terminal are molded with resin, and the molded resin The outer surface of the transformer is the outer surface of the transformer, and a mounting block is built in the mold resin, and the mounting block is fastened to both side plates of the gun bracket by mounting bolts to hold the transformer. Transformer for welding.

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