JPH03308Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field The present invention is a welding gun that allows a pair of electrodes of the welding gun to be smoothly and accurately shifted in two dimensions on one plane. The present invention relates to a shift device.

(2) Prior Art A conventional welding gun in which the position of the welding point is changed and controlled is known (see Japanese Utility Model Publication No. 56-6227).

(3) Problems to be solved by the invention By the way, when using the above-mentioned welding gun to weld a two-dimensional position on the plane of the workpiece, the pair of electrodes of the welding gun is placed at an arbitrary welding point position on the plane. Although shift control is required, such shift control is difficult with the conventional devices.

Therefore, the present invention is to efficiently perform two-dimensional welding on a plane by controlling the shift of a pair of electrodes of a welding gun very smoothly and accurately to a plurality of welding points distributed on a plane of a workpiece. It is an object of the present invention to provide a welding gun shift device with a simple configuration that allows for the following.

B. Structure of the invention (1) Means for solving the problem According to the invention, in order to achieve the above-mentioned purpose, there is a shift base installed on the machine frame; and a shift table reciprocatably installed on the shift base. a first drive device that reciprocates the shift table; a gun bracket that is pivotably supported on the shift table and extends along the reciprocating direction of the shift base; a second drive device for driving; a welding gun supported at the tip of the gun bracket; a pair of first and second cam plates provided on both sides of the intermediate portion of the gun bracket; It consists of a pair of first and second sliding members supported by the shift base facing the cam surface of the cam, and the cam surfaces of the first and second cam plates are moved by the rocking of the gun bracket. The first and second sliding members are selectively engaged with each other.

(2) Effect According to the above configuration, the electrode of the welding gun can be shifted and controlled to the welding point position in the two-dimensional direction on the plane of the workpiece by the operation of the first and second drive devices, and Welding can be performed extremely easily and accurately.

(3) Example An example of the present invention will be described below with reference to drawings.
explain.

In the following description, "front, rear" and "left, right" refer to the forward direction of the welding gun W (arrow direction in FIG. 1).

A shift base 2 is fixed to a machine frame 1. The shift base 2 is formed into a U-shape in plan view by integrally joining the rear ends of a pair of vertical frames 3 ₁ and 3 ₂ parallel to each other with an interval between them by a horizontal frame 4. Brackets 5 _{1 , 5 2 are integrally hung near the front of the pair of vertical frames 3 1} , 3 _{2 ,} respectively, and between these brackets _{5 1} , _{5 2 and} the horizontal frame 4 , vertical frames parallel to each other are provided. A pair of guide bars 6 ₁ and 6 ₂ extending in the front-rear direction below the frames 3 ₁ and 3 ₂ are connected. A pair of guide bars 6 ₁ and 6 ₂ have a shift table 7
is supported so that it can slide back and forth. This shift table 7 includes a pair of sliders 8 ₁ , 8 ₂ that are slidably fitted to the pair of guide bars 6 ₁ , 6 ₂ , an upper and lower connecting plate 9 that connects the sliders 8 ₁ , 8 ₂ ; It is equipped with 10. An extension piece 11 extending forward is fixed to the front part of the connecting plate 9.

A bracket 1 is installed at the front of the shift base 2.
2 are integrally erected, and this bracket 12 has a first
A driving device or first hydraulic cylinder 13 is supported. The first hydraulic cylinder 13 is the shift base 2
The piston rod 1 extends in the front and back direction of the
The head 15 of No. 4 is connected to the front end of the extension piece 11. Therefore, when the first hydraulic cylinder 13 is operated to expand and contract, the shift table 7 is moved to the guide bar 6 ₁ ,
It can reciprocate back and forth along 6 ₂ .

Upper and lower connecting plates 9 and 1 of the shift table 7
A substantially vertical pivot shaft 16 is fixed to the gun bracket 16, and an intermediate portion of a gun bracket 17 near the rear end is supported on this pivot shaft 16 so as to be able to swing from side to side. A second drive device, that is, a second hydraulic cylinder 19 supported by the lower connecting plate 10 via a support arm 18 is connected to the rear end of the gun bracket 17.
The gun bracket 17 is swung left and right around the pivot shaft 16 by the expansion and contraction operation of the hydraulic cylinder 19. Further, the gun bracket 17 extends in the front and back direction of the shift base 2, and its front portion passes between the tips of the pair of vertical frames 3 ₁ and 3 ₂ of the shift base 2 and extends forward thereof. A pair of first and second cam plates 20 ₁ are provided on the front left and right sides of the gun bracket 17 .
20 ₂ are removably fixed, and those cam plates 2
A cam surface 21 ₁ of a predetermined shape is provided on the outer surface of 0 ₁ , 20 ₂ .
21 ₂ is formed. At the front ends of the vertical frames 3 ₁ and 3 ₂ of the shift base 2, there are a pair of first and second frames.
Sliding members, that is, first and second rolling rollers 22, ₁ ,
22 ₂ is rotatably supported. Said first and second
The rolling surfaces of the rolling rollers 22 ₁ and 22 ₂ face the cam surfaces 21 ₁ and 21 ₂ of the first and second cam plates 20 ₁ and 20 ₂ , respectively, and the gun bracket 17
When swung left and right, the first and second cam plates 20 ₁ ,
The cam surfaces 21 ₁ and 21 ₂ of 20 ₂ can selectively engage with the first and second rolling rollers 22 ₁ and 22 ₂ .

A welding gun W is supported at the tip of the gun bracket 17. This welding gun W has a conventionally known structure, and is equipped with a pair of gun arms _{23 1 and 23 2 that} can be opened and closed and have electrodes 24 ₁ and 24 ₂ at their tips. When the electrodes are formed, the pair of electrodes 24 ₁ and 24 ₂ face each other, and the workpiece 25 is sandwiched between them.

Next, the operation of this embodiment will be explained.

When the second hydraulic cylinder 19 is operated to extend or contract, the gun bracket 17 swings around the pivot shaft 16 and the second hydraulic cylinder 19 is moved.
As shown by the solid line in the figure, the cam surface 2 of the first cam plate ₂₀₁
1 ₁ can be engaged with the first rolling roller 22, or the cam surface 21 ₂ of the second cam plate 20 ₂ can be engaged with the second rolling roller 22 ₂ as shown by the chain line in FIG. As mentioned above, the cam surfaces 21 ₁ and 21 ₂ of the first and second cam plates 20 ₁ and 20 ₂ are
If the first hydraulic cylinder 13 is telescopically operated while being selectively engaged with the rolling rollers 22 ₁ and 22 ₂ ,
The shift table 7 reciprocates back and forth along the pair of guide bars 6 ₁ and 6 ₂ and moves the gun bracket 17 connected thereto back and forth, but at this time, the cam surface 21 ₁ of the first cam plate 20 ₁ or Second cam plate 20 ₂
By engaging the cam surface 21 ₂ ) with the first rolling roller 22 ₁ (or the second rolling roller 22 ₂ ),
The gun bracket 17 is attached to the cam surface 21 ₁ of the first cam plate 20 ₁ (or the cam surface 21 ₂ of the second cam plate 20 ₂ ).
It swings around the pivot shaft 16 along the axis. Therefore, the electrodes 24 ₁ at the tips of the pair of gun arms 23 ₁ , 23 ₂ of the welding gun W supported by the gun bracket 17 ,
24 ₂ can be shifted in two-dimensional directions on one plane by drawing a predetermined locus, and the gun arms 23 ₁ ,
Welding can be performed at a plurality of dot positions distributed on the plane of the work 25 held between the electrodes 24 ₁ and 24 ₂ of 23 ₂ .

C. Effects of the invention As described above, according to the invention, the pair of electrodes of the welding gun can be controlled to shift to a predetermined welding point position on a plane simply by controlling the operation of the first and second drive devices. Welding in two-dimensional directions on the plane of the workpiece can be performed smoothly and easily, and the welding efficiency can be greatly increased.

In addition, since the dot position is set by the cam profile of the cam plate and the sliding member that engages with it, the electrode can be accurately shifted to the dot position, and the dot position can also be changed by replacing the cam plate. It's easy to do.

[Brief explanation of the drawing]

The drawings show one embodiment of the device of the present invention, in which FIG. 1 is a longitudinal sectional side view thereof, FIG. 2 is a bottom view taken along the line in FIG. 1, and FIG. 3 is a sectional view taken along the line in FIG. FIG. 4 is a sectional view taken along the line shown in FIG. 1. W... Welding gun, 1... Machine frame, 2... Shift base, 7... Shift table, 13... First hydraulic cylinder as first drive device, 17... Gun bracket, 19... Second drive 2nd hydraulic cylinder as a device, 20 ₁ , 20 ₂ ... first and second cam plates, 21 ₁ , 21 ₂ ... cam surface, 22 ₁ ... first rolling roller as a first sliding member, 22 ₂ ...Second
A second rolling roller as a sliding member.

Claims (1)

[Scope of utility model registration request] a shift base 2 installed on the machine frame 1; a shift table 7 reciprocatably provided on the shift base 2; a first drive device 13 for reciprocating the shift table 7; a gun bracket 17 that is pivotably supported and extends along the reciprocating direction of the shift base 2;
a second drive device 19 that swings and drives the gun bracket 17; a welding gun W supported at the tip of the gun bracket 17;
A pair of first and second plates provided on both sides of the middle part of 7
Cam plates 20 ₁ , 20 ₂ and the first and second cams 20 ₁ ,
It consists of a pair of first and second sliding members 22 ₁ and 22 ₂ supported by the shift base 2 facing the cam surfaces 21 _{1 and} 21 ₂ of 20 2 , and when the gun bracket 17 swings, The first and second cam plates 20
₁ , 20 ₂ cam surfaces 21 ₁ , 21 ₂ are selectively engaged with the first and second sliding members 22 ₁ , 22 ₂ .