JPH08308B2 - C-type welding gun device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a C-type welding gun device with a transformer.

[0002]

2. Description of the Related Art Conventionally, as seen in Japanese Utility Model Laid-Open No. 60-141977, a pressure cylinder slidably supported by a gun bracket, a movable gun arm mounted on a piston rod of the pressure cylinder, and A C-type welding gun device is known which includes a fixed gun arm extending from the pressure cylinder side to the tip of the movable gun arm and facing the tip of the movable gun arm, and a transformer provided on the tail end side of the fixed gun arm. In this type, a support plate protruding laterally is attached to the outer end surface of the head cover at both ends of the pressure cylinder, a guide bar is extended between the both support plates, and the pressure cylinder is attached to the gun bracket through the guide bar. It is slidably supported by.

[0003]

In the above, the support plate and the guide bar are provided as the components of the guide mechanism for slidably supporting the pressure cylinder, so that the number of parts increases and the structure becomes complicated. At the same time, there is a problem that the guide mechanism becomes large. By the way, when the pressurizing cylinder is operated by a high-pressure fluid in order to increase the pressurizing force of the work, a high-pressure cylinder formed by fastening the head covers at both ends with a plurality of tie rods extending between them is used as the pressurizing cylinder. Is desired. The present invention provides a C-type welding gun device that solves the above-mentioned problems by using such a high-pressure cylinder as a pressurizing cylinder and configuring a slide guide mechanism of the pressurizing cylinder by using a tie rod of the cylinder. That is the purpose.

[0004]

In order to achieve the above object,
According to the present invention, the pressure cylinder slidably supported by the gun bracket, the movable gun arm attached to the piston rod of the pressure cylinder, the tip of the movable gun arm extending from the pressure cylinder side to the tip of the movable gun arm. In a C-type welding gun device including a fixed gun arm facing each other and a transformer provided on the tail end side of the fixed gun arm, at least one pair of at least one pair of tie rods extending between the head covers at both ends of the pressurizing cylinder is provided. The tie rod was inserted into a guide sleeve formed on the gun bracket, and the pressure cylinder was slidably supported on the gun bracket via the tie rod.

[0005]

Operation: By inserting the pair of tie rods of the pressure cylinder into the pair of guide sleeves of the gun bracket, the pressure cylinder is prevented from rotating with respect to the gun bracket and slidably supported. The movable gun arm is opened and closed by the movement of the rod, and the fixed gun arm is opened and closed by the sliding of the pressure cylinder with respect to the gun bracket.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 denotes a pressure cylinder,
Piston rod 1a projecting ahead of the pressure cylinder 1
A movable gun arm 3 is attached to the movable cylinder arm 3 via an insulating material 2, and a fixed gun arm 4 is provided on the upper side of the pressurizing cylinder 1 so as to extend ahead of the movable gun arm 3 and face the tip of the movable gun arm 3. A C-type welding gun for sandwiching and welding a work between the electrodes 3a, 4a attached to the facing surface of the tip of No. 4 was constructed. A transformer 5 is provided on the tail end side of the fixed gun arm 4, and a secondary coil 5a of the transformer 5 has a center tap 5b, as shown in FIG.
The taps 5c and 5c at both ends of the coil are integrally formed, and these taps 5b and 5c are projected on the tip end surface of the transformer 5 as shown in FIGS. And tap 5 at both ends
c and 5c, a pair of terminal plates 6 and 6 are opposed to each other in the width direction of the transformer 5 and fastened with bolts 7. Between the terminal plates 6 and 6, as shown in FIGS. The tail end portion 4b formed in the plate shape is formed between the terminal plates 6 and the rectifier 8 respectively.
Inserted in a state in which the terminal plates 6 and 6 are interposed, and the terminal plates 6 and 6 are sandwiched by a plurality of tightening bolts 10 between the pair of holding plates 9 and 9 provided on both outer sides in the opposite direction via the disc spring 11. The tail end portion 4b of the fixed gun arm 4 was clamped and fixed between the two terminal plates 6 and 6 via the rectifiers 8 and 8. Also, the center tap 5
b for power feeding relay member 12 and ounce copper plate 13
And a terminal portion 3b formed in the movable gun arm 3 via the, and thus a direct current that is full-wave rectified by the pair of rectifiers 8 is flown between the movable gun arm 3 and the fixed gun arm 4. The spot welding of the work sandwiched between the electrodes 3a, 4a of both gun arms 3, 4 was performed.

The pressure cylinder 1 includes a cylinder barrel 1c having a piston 1b inserted therein, head covers 1d and 1d at both ends of the barrel 1c, and both head covers 1d and 1d.
It is composed of a plurality of tie rods 1e extending therebetween, and an arm mounting seat 14 is integrally formed on the upper edge of the head cover 1d on the tip side, and the fixed gun arm 4 is attached to the mounting seat 14 at its tail end portion. A bolt 16 is fixed to the lower surface of 4b through an insulating material 15, and a transformer mounting seat 17 is integrally formed on the upper edge of the tail end side head cover 1d.
The transformer 5 was fastened with bolts 18 at the lower surface of the tip end thereof. The fixed gun arm 4 is arranged offset to one side with respect to the center plane a of the welding gun including the axis of the piston rod 1a of the pressurizing cylinder 1 and the center line of the center of the transformer 5 in the width direction. The other side of the surface a was used as an empty space in which the fixed gun arm 4 did not exist, and the ounce copper plate 13 was disposed here so that the ounce copper plate 13 did not largely project to the side of the center surface a. In this embodiment, the pressurizing cylinder 1 and the transformer 5 are formed to have a substantially equal width, and the movable gun arm 3, the fixed gun arm 4 and the ounce copper plate 13 are all accommodated within this width.

The pressurizing cylinder 1 is slidably supported by a gun bracket 20 attached to an operating end 19 of a moving mechanism such as a robot, and the piston protruding toward the tail of the pressurizing cylinder 1 is attached to the gun bracket 20. A stopper portion 20b is formed integrally with the rod 1a so as to face the rod portion 1f, and when the piston rod 1a is retracted when the gun is opened, the rod portion 1f contacts the stopper portion 20b when the gun arm 3 is opened by a predetermined opening. After that, the pressurizing cylinder 1 is moved forward with respect to the gun bracket 20 by the contact reaction force, and the fixed gun arm 4 is opened forward so that a so-called equalizing operation is given. The sliding guide mechanism of the pressurizing cylinder 1 is constructed by utilizing the tie rods 1e of the cylinder 1. To explain this in detail, the pair of tie rods 1e, 1e below the pressurizing cylinder 1 are attached to the gun bracket. A pair of guide sleeves 20a, 20a formed in 20 were slidably inserted, respectively, and the pressure cylinder 1 was slidably supported by the guide bracket 20 on the tie rods 1e, 1e. According to this configuration, the guide mechanism is downsized and simplified, and the entire device including the guide mechanism and the gun bracket 20 can be configured compactly so as to fit within the width of the pressure cylinder 1.

[0009]

As is apparent from the above description, according to the present invention, the pressurizing cylinder can be slidably supported on the gun bracket through the tie rod, and a sliding guide mechanism of the pressurizing cylinder is constituted. There is an effect that a dedicated member is not required, the guide mechanism is small and simple, and a small and inexpensive C-type welding gun device can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view in which a part of an example of the device of the present invention is cut away.

FIG. 2 is a plan view thereof.

FIG. 3 is a sectional view taken along the line III-III in FIG.

4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a perspective view of a secondary coil of a transformer.

[Explanation of symbols]

1 Pressurizing cylinder 1a Piston rod 1d
Head cover 1e Tie rod 3 Movable gun arm
4 Fixed gun arm 5 Transformer 20 Gun bracket 20
a Guide sleeve

Claims (1)

[Claims] 1. A pressure cylinder slidably supported by a gun bracket, a movable gun arm attached to a piston rod of the pressure cylinder, and a tip of the movable gun arm extending from the pressure cylinder side to the tip of the movable gun arm. In a C-type welding gun device provided with a fixed gun arm facing the section and a transformer provided on the tail end side of the fixed gun arm, at least one pair of a plurality of tie rods extending between head covers at both ends of a pressure cylinder. C type welding gun device characterized in that the tie rod is inserted into a guide sleeve formed on the gun bracket, and the pressure cylinder is slidably supported by the gun bracket via the tie rod.