JPS586630Y2 - Spot welding shift device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a shift device for changing the dot position of a gun arm in a spot welding machine.

More specifically, in a spot welding machine that is equipped with a pair of gun arms and a cylinder unit that opens and closes them, a swinging member that supports the gun body is slidable up and down on a support leg that is set up on the machine stand. Hold it with long holes and pins, and hold these and long holes,
The actuating member, which is locked by a pin, is actuated by the cylinder unit, and the gun body can be shifted within the same plane without drawing an arcuate trajectory, and by changing the elongated hole, pin, etc., there is no need to make any changes to the device. The present invention relates to a shift device for a spot welding machine capable of shifting to welding point positions with differences in height.

In multi-point welding, the welding gun cannot arrange the number of welding points in places where the pitch of welding points is narrow or in places where the welding points are crowded.

For this reason, it is necessary to weld two locations with one welding gun, and a mechanism for shifting the welding gun for ejecting the main workpiece has been proposed and put into practical use.

Conventionally, this type of shift device uses a link mechanism or a tilting table to shift the welding gun, but in the case of a link mechanism, the tip of the lower fixed electrode is centered around the fulcrum when the gun moves due to the operation of the link mechanism. Since the tip draws an arcuate trajectory, it has the disadvantage that the tip hits the workpiece, deforming the workpiece, and damaging the tip and gun.

In addition, since a drive source such as a cylinder unit is disposed on the machine stand, multi-welding machines have drawbacks such as difficulty in attaching the gun body and difficult maintenance.

Furthermore, if there is a difference in height between the hitting points, it is necessary to change the length of the link or insert a tilting table, which complicates the mechanism and makes it difficult for the device to have the hitting points on the same plane. It is difficult to standardize, and costs inevitably increase.

The inventor of the present invention has devised the present invention in view of the above-mentioned problems with conventional shift devices for spot welding machines.

The purpose of this invention is to hold the swinging member that supports the gun body on the support leg set up on the machine base so that it can slide up and down with long holes, pins, etc., and to lock it with the long holes and pins. This spot welding system uses a cylinder unit to operate the actuating member to shift the gun body within the same plane without drawing an arcuate trajectory, thereby protecting the workpiece and the gun.This method achieves the above with a simple mechanism. Provides machine shifting equipment.

Another purpose of the present invention is to make the device common by changing the shapes of long holes, pins, etc., without requiring changes to the device, and to reduce height differences without increasing the number of parts or complicating the device. To provide a shift device for a spot welding machine capable of shifting to a certain welding point position.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view with main parts cut away, FIG. 2 is a side view of the same, and FIG. 3 is a longitudinal sectional side view of the shift mechanism.

Reference numeral 1 denotes a base, on which a support leg 2 is erected, and the support leg 2 has two parallel leg pieces 2b extending upward from the base 2a.
, 2b (see Fig. 3).

Leg piece 2b of this support leg 2, the lower part of 2b from the outside, piece 3b,
An actuating plate 3 is provided between the supporting legs 3b and 3b, and the actuating plate 3 extends to one end of the support leg 2, is pivotally connected to the extending portion 3a by a pin 4a, and is connected to the upper end of the hanging link 4. Ru.

A shift actuation cylinder unit 5 is installed hanging from the base 1, and in the illustrated example, the unit 5 hangs downward from the window 1a of the base 1 and does not protrude above the top surface of the base 1.

The end of the piston rod 5a of the cylinder unit 5 that moves up and down is connected to the lower end of the link 4 described above by a pin 4b.

A swinging plate 6 is inserted between the left and right leg pieces 2b, 2b of the supporting leg 2, and the plate 6 has an intermediate or lower portion between the leg pieces 2b, 2b.
The upper part is the leg piece 2b.

2b extends upward.

A pin 7 is inserted between the left and right pieces 3b of the actuating plate 3 so as to pass through the inner legs 2b, 2b and the swinging plate 6 sandwiched between the legs 2b, 2b.

The pin 7 is pivotally connected to the pieces 3b, 3b and the leg pieces 2b, 2b, and is fitted into an oblique elongated hole 8 provided in the swing plate 6.

A second pin 9 is provided below the first pin 7 so as to pass through the members 3b, 3b, 2b, 2b, 6 in the same manner as described above, and the second pin 9 is connected to the outer piece 3b.

3b and the plate 6, and are fitted into and engaged with oblique elongated holes 10 provided in the leg pieces 2b, 2b.

Further, a third pin 11 is installed across the upper portions of the leg pieces 2b, 2b above the actuating plate 3, and this pin 11 is inserted into a sliding piece in an elongated hole 12 in the vertical direction provided in the middle part of the swing plate 6. They are fitted and engaged via 13.

A spot welding device 14 is installed on the swing plate 6, and the device 14 includes upper and lower gun arms 15 and 16, a cylinder unit 17 for opening and closing these, and the like.
Chips 15a and 16a are provided at opposing portions 5 and 16.

Next, the operation will be explained. At A shown by the solid line in FIG.

16a and perform spot welding.

Next, when welding another dot position B1 of the workpiece W,
The cylinder unit 17 is released, the shift operation cylinder unit 5 is driven, and the piston rod 5a is moved upward.

The extending portion 3a of the actuating plate 3 is lifted via the link 4, and the actuating plate 3 moves to the first position with the first pin 7 as a fulcrum.
The second pin 9 swings counterclockwise in the figure, and as a result, the second pin 9 rotates in the same direction about the first pin 7.

This movement of the second pin 9 causes the leg piece 2b to move. It is allowed and restrained by the elongated hole 10 provided in 2b.

When the second pin 9 moves from the solid line position in Figure 1 to the position C shown in chain lines, the lower part of the swing plate 6 moves to the right in Figure 1 because it is connected to the pin. This is allowed by the long hole 8 that engages with the pin 7 of No. 1.

Then, the plate 6 swings counterclockwise in the figure using the third pin 11 as a fulcrum and reaches position B, where it reaches the position of the previously mentioned pin 11. ,9
, the vertical movement caused by the movement through the long holes 8 and 10 is absorbed by the sliding seat 13 of the third pin 11 sliding in the vertical direction within the long hole 12.

Therefore, the gun arm, especially the lower fixed side gun arm 15 that includes the tip 15a, moves from point A1 to point B1 without drawing an arcuate trajectory within the same plane, and the tip 1
5a does not draw an arcuate trajectory and push up the lower surface of the workpiece W, so that the workpiece W and the tip 15a are not damaged.

Although FIG. 1 shows two shift devices each equipped with a spot welding device, this is only a partial illustration of a large number of such devices.

FIG. 4 shows a modified embodiment.

In this embodiment, A2. It is used when there is a difference in height like B2, and the basic structure is the same as above, so the same reference numerals are used.

The only difference in this embodiment is that the positions of the first pin 7 and second pin 9 are changed in the parts corresponding to the elongated holes 8 and 10 described above, and the elongated holes 8 and 10 are arranged in the vertical direction. The only difference is that it is installed on a steep slope.

As the operating plate 30 swings counterclockwise around the first pin 7, the second pin 9 moves upward along the long hole 10, and the swing plate 6 swings due to the action of the long hole 12° pin 110. Lift while moving, shift from point A2 to point B2, and perform spot welding.

In this way, by simply changing the mounting position of the pin and the elongated hole, it is possible to shift the striking position with a difference in height using common parts and equipment.

As is clear from the above, according to the present invention, the plate member, the support member and the pin, without using parallel links or inclined tables,
When shifting the gun arm to a different welding point position on the same plane due to engagement with a long hole, etc., the position can be changed without causing the stationary side gun arm to collide with the workpiece, thereby preventing damage to the workpiece and welding gun. do not have.

Therefore, the hitting point position can be changed and the workpiece can be delivered smoothly.

In addition, when performing spot welding with differences in height, it is possible to perform this by simply changing the long holes and pins without adding additional parts or changing the equipment, and the structure is simple and easy to use. It has remarkable practical effects such as being able to obtain and provide it at low cost.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a front view with main parts cut away, Fig. 2 is a side view of the same, Fig. 3 is a vertical side view of the shift mechanism, and Fig. 4 is a modified example. This is an example diagram. In the drawing, 1 is a base, 2 is a support leg, 3 is an operating member, 5 is a cylinder unit, 6 is a swing plate, 7 is a first pin, 9 is a second pin, 11 is a third bin, 8° 10. 12 is a long hole, 1
5 and 16 are gun arms, and 17 is a cylinder unit.

Claims (1)

[Scope of utility model registration request] A pair of gun arms, a swinging plate to which a welding device including a cylinder unit etc. for opening and closing these arms is fixed, an actuating member actuated by a cylinder unit etc. fixed to a base, the actuating member and the swinging plate. a first pin that pivotally connects the operating member and the supporting leg and engages with a long hole provided in the swinging plate; a second pin that is pivotally connected to the support leg and engages with a long hole provided in the swing plate; and a third pin that is pivotally connected to the support leg and engages with a long hole provided in the swing plate; It is characterized by being configured such that the movement of the swinging plate caused by the second pin caused by the movement of the operating member using the pin as a fulcrum is allowed by the relative movement between the elongated hole provided in the plate and the third pin. Shift device for spot welding machine.