JPS6327904Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for rotating a profiling jig of a welding machine having a pair of disc-shaped rotating electrodes.

Conventionally, as shown in FIG. 1, when welding a product 2 having an annular welded part 1 such as an automobile oil tank, a pair of disc-shaped electrodes 3 that sandwich the welded part 1 are welded. , 4, a support for guiding and supporting the product 2, and a profiling jig (not shown).

The pair of electrodes 3 and 4 rotate the welded part 1 in the extending direction of the welded part using an electric motor as a drive source while welding the welded part of the product, and at that time, the welded part 1 is rotated together with the welded part 1. The support column and profiling jig are also rotated.

However, the part 1 to be welded of the product 2 described above is not necessarily circular, and generally has a corner part 1a in many cases. When the corner of the part to be welded reaches between the electrodes, the angle at which the electrode rotates the part to be welded becomes very large. It has become impossible to rotate the jig, and for this reason, in the past, workers had to forcefully rotate the product or the profiling jig manually. Therefore, in the past, there was a problem of requiring labor and reducing work efficiency.

The present invention was devised to solve such conventional problems, and its purpose is to improve the efficiency of welding work on products with corners to be welded. The purpose of the present invention is to provide a jig rotation device.

The gist of the present invention is that, in the conventional welding machine described above, the rotation shaft of the fluid pressure motor is rotated in order to rotate the profiling jig so as to rotate the part to be welded of the product in its extending direction. It is connected to a jig.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings.

The welding machine shown in FIG. 2 is similar to the conventional one, and includes a plurality of (for example, four) columns 5 on which a product 2 having an annular welded part 1 is placed and supported, and a profiling jig 6 holding the columns 5. , a fixed roller 7 and a movable roller 8 for guiding the profiling jig 6, and a pair of disc-shaped rotating electrodes 3, 4 (see FIG. 1).

Further, the welding machine has a frame body 9 that integrates each device, and the fixed roller 7 is supported by a bearing 10 fixed to the frame body 9. On the other hand, the movable roller 8 is held by a support shaft 12 that rotates in the direction of the arrow with the other end of the horizontal rod 11 fixed to the frame body 9 at one end as a fulcrum. By being rotated as shown in FIG. 2, the movable roller 8 moves toward or away from the fixed roller 7. Note that the cylinder 13 is attached to the frame body 9.

Further, the electrode 3 is rotated by an electric motor 14 attached to the frame body 9, and the other electrode 4 is driven to rotate by the electrode 3 via the welded part 1 of the product 2. The electrode 4 is attached to the frame body 9 via a universal joint 15 or the like.

Furthermore, a roller 1 is provided on the upper part of the frame body 9 to press down the upper part of the product 2 on the support column 5.
A cylinder 17 having a diameter of 6 is attached. The rollers 16 are rotated together as the product 2 is rotated in a horizontal plane.

Note that a non-conductive insulator 18 is interposed between the pillar 5 and the profiling jig 6.

When using the above welding machine, place the product 2 on the support 5.
After holding it above, the profiling jig 6 is held between the movable roller 8 and the fixed roller 7, and the part 1 of the product 2 to be welded is held between the electrodes 3 and 4. Then, the electrode 3 is rotated to proceed with welding. At this time, it goes without saying that the profiling jig 6 correctly guides the part 1 to be welded between the electrodes 3 and 4.

According to the present invention, in the above-described welding machine, a fluid pressure motor 19 such as an air motor or a hydraulic motor is provided to assist the electrode 3 in rotating the product 2 and the profiling jig 6. The upper end of the moving shaft 20 is connected to the center of the lower surface of the profiling jig 6.

The fluid pressure motor 19 itself is held by a support 21 that can move in two dimensions, for example, within a plane parallel to the plane of the product 2 that includes the welded portion 1 . The support body 21 includes a slide holding part 22 fixed to the frame main body 9, a first slide 23 attached to the slide holding part 22 so as to be able to slide in a direction perpendicular to the plane of the paper, and a first slide 23. A second slide 24 is attached to be able to reciprocate in a horizontal direction parallel to the paper surface, an arm 25 is attached to the second slide 24, and an arm 25 is attached to the second slide 24 to integrally connect the second slide 24 and the fluid pressure motor 19. ,
It also includes a bearing assembly 26 that supports the rotating shaft 20 of the fluid pressure motor 19.

As a result of using such a support body 21, even if the distance from the center of the profiling jig 6 to the fixed roller 7 changes, the fluid pressure motor 19 can rotate the profiling jig 6 in a predetermined direction while following this change. can be moved. Note that instead of using the support body 21,
Fixing the fluid pressure motor 19 to the frame body 9,
Further, the rotation shaft 20 may be made flexible by interposing a desired number of universal joints on the rotation shaft 20.

The fluid pressure motor 19 is activated when the corner 1a of the welded part 1 of the product 2 reaches between the electrodes 3 and 4, that is, when the corner of the profiling jig 6 reaches between the fixed and movable rollers 7 and 8. , serves to compensate for the lack of rotational force of the electrode 3 and to reliably rotate the profiling jig 6 and its accessories without using human power.

Furthermore, in this embodiment, the fluid pressure motor 1
In order to assist the action of 9, a biasing link device 27 is provided. This biasing link device 27 is connected to the second to
As shown in FIG.
The first link 28 connected to the crank portion 20a of
and a second link 2 whose one end is connected to the other end of this
9, and a third link 30 having one end connected to the other end thereof and the other end connected to the frame body 9,
It is provided with a spring balancer 31 that always draws the second link 29 toward the frame main body 9 side. The biasing link device 27 is in the state shown in FIG. 3A when the electrodes 3 and 4 are welding the straight part 1b of the welded part 1 as shown in FIG.
Even if the profiling jig 6 connected to the fluid pressure cylinder 19 tries to rotate, the straight part of the profiling jig 6 is pressed and held between the fixed roller 7 and the movable roller 8, so the rotation is prevented. be done. Therefore, the part 1 to be welded, which is assisted by the profiling jig 6 which moves straight due to the rotational driving force of the electrode 3 and the movable roller 8, is successively welded so that the corner part 1a is aligned with the electrodes 3 and 4.
is moved to a position that is reached in between.

At this time, the biasing link device 27 is in a state as shown in FIG.
The profiling jig 6 can be rotated by the fluid pressure cylinder 19, and the profiling jig 6 can be rotated by the crank portion 20a rotating about the axis C of the rotation shaft 20. 6 is given rotational force. As a result, the tracing jig 6 cooperates with the rotational force of the movable roller 8 as shown in FIG. 3C.
Welding is performed on the corner 1a of the part to be welded 1 while easily passing through the corner of the profiling jig 6.
As it is rotated by 90 degrees as shown in Figure D, the corner section that is the starting end side of the new straight section is held between the fixed roller 7 and the movable roller 8.

As a result, welding of a new straight line portion can be continuously performed by the electrodes 3 and 4 on the welded portion 1 provided on the copying jig 6 .

In the embodiment described above, a crank portion 20a is provided on the rotating shaft 20 of the fluid pressure motor 19, and a biasing link device 27 including the first to third links 28, 29, 30 and a spring balancer 31 is provided on the crank portion 20a. Although the rotation of the corner portion is made smoother by engaging the fluid pressure motor 1,
The object of the present invention can be achieved simply by connecting the profiling jig 9 and the tracing jig 6 through a linear rotation shaft.

As is clear from the description of the above embodiments, since the present invention is provided with a fluid pressure motor that facilitates the rotation of the profiling jig, the profiling jig and its accessories can be smoothly rotated without using human power. can be done. Note that a fluid pressure motor is advantageous because it does not have the risk of burning out like an electric motor, even if it is overloaded.

As explained above, according to the present invention, there is provided a rotating device for a profiling jig in a welding machine that eliminates the need for human power and improves work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an automobile oil tank, which is an example of a product having an annular welded part, and Fig. 2 is a partial cross-sectional elevational view of a welding machine using a rotating device according to an embodiment of the present invention. Fig. 3 is - of Fig. 2.
FIG. 6 is an explanatory diagram of the operation of the urging link device portion along a line cross-sectional view. 1... Part to be welded, 2... Product, 3, 4... Electrode, 5... Support, 6... Tracing jig, 7... Fixed roller, 8... Movable roller, 9... Frame main body, 10 ... Bearing, 11 ... Horizontal rod, 12 ...
Support shaft, 13...Cylinder, 14...Electric motor, 15...Universal joint, 16...
roller, 17... cylinder, 18... insulator,
19...Fluid pressure motor, 20...Rotation axis, 21
...Support body, 27...Biasing linkage device.

Claims (1)

[Scope of utility model registration request] A support that supports a product having an annular welded part, a profiling jig that holds the support, a roller that guides the profiling jig, and a support that holds the welded part of the product and supports the welded part. A welding machine equipped with a pair of disc-shaped electrodes that rotates the welded part in the extending direction of the welded part while performing welding, the welding machine rotates the welded part of the product in the extending direction. A rotating device for a profiling jig in a welding machine, characterized in that a rotating shaft of a fluid pressure motor is connected to the profiling jig in order to rotate the profiling jig so as to rotate the profiling jig so as to rotate the profiling jig.