JPS6141670B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding device used for manufacturing electric resistance welded pipes.

FIG. 1 shows a schematic configuration of a pipe manufacturing equipment line equipped with a welding device, such as a high-frequency induction heating welding device, for manufacturing ERW steel pipes. In FIG. 1, a strip metal plate 11 wound around an uncoiler 1 As the material passes through three groups of forming rolls via the guide roller 2, it is gradually formed into a circular cross-sectional shape (hereinafter, this formed object is referred to as a workpiece). That is, for a pipe-shaped workpiece having a joint in the axial direction, power from the high-frequency induction heating device 4 is transferred to the workpiece coil 12 shown in FIG.
The material is heated by supplying the material to the material, and is welded and joined by the squeeze roll 5. The welded and joined workpieces then pass through a speed cutting machine 6, a cooling device 7, a group of sizing rolls 8, and a running cutting machine 9.
The metal pipe 10 is cut to a fixed size.

When manufacturing ERW pipes using the above-mentioned high-frequency induction heating welding equipment, the frequency of the heating welding equipment is generally high (100 to 500 KHz), which further stabilizes the weld and maintains high quality. To do this, a medium frequency around 50KHz is used. However, at this medium frequency, the heating depth of the weld is deeper than at high frequency, so there is a drawback that power consumption increases by 20 to 40% compared to high frequency. Therefore, by operating the device by switching the frequency in a short time depending on the type of electric resistance welded tube to be manufactured, power consumption can be reduced and high quality electric resistance welded tubes can be obtained.

However, in order to switch the frequency, it is necessary to change the oscillation circuit of the high-frequency induction heating device as well as its output transformer. For example, an output transformer used for medium frequencies must have a high inductance of about 8 times or more when viewed from the primary side of the transformer to the load side compared to that for high frequencies in order to be matched with the work coil 12 shown in Figure 2. do not have. Therefore, it is usually necessary to provide separate output transformers for frequency switching. However, since the output transformer is relatively large, it takes a lot of time to convert the output transformer by changing the frequency, which has the disadvantage of causing a decrease in productivity.

This invention was made in view of the above circumstances, and when changing the heating frequency of a high frequency induction heating device,
An object of the present invention is to provide an induction heating welding device that enables quick replacement of an output transformer.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is an explanatory diagram for explaining the principle of this invention, in which the output end of the high frequency induction heating device 4 is connected to the flexible conductor 1.
It is connected to the output transformer 14 via 3a and 13b. The output transformer 14 includes a flexible conductor 13a,
13b can be replaced. In FIG. 3, the same parts as in FIGS. 1 and 2 are designated by the same reference numerals. 4 to 6 show specific embodiments of the present invention. In FIGS. 4 to 6, 14a and 14b are first and second output transformers each having an output transformer body inside. The first output transformer 14a is placed on a first movable table device 15 that can move back and forth, left and right, and up and down. This first
Although the detailed structure of the moving table device 15 is not shown, it has substantially the same function as the moving table device of the second output transformer, which will be described later. The first moving table device 15 is disposed approximately parallel to the workpiece forming processing conveyance device (work path line) shown in FIG. Stand device 15
Let the direction in which it moves be the x direction, and let the direction orthogonal to this x direction be the direction in which the movable table device 15 moves, the Y direction. Note that the Z direction is the direction in which the first output transformer 14a is lifted. The first output transformer 14
a can be separated from the position indicated by line A--A in FIG. That is, the first output transformer 14a is simply placed on the mounting table 16 of the first moving table device 15.

A flexible conductor 1 is provided above the first output transformer 14a.
Terminals 17a, 17b are provided to connect the terminals 3a, 13b, and the terminals 17a, 17b and the flexible conductors 13a, 13b are detachable. 18
is a protective bellows that covers the flexible conductors 13a and 13b, and one end of this bellows 18 is connected to the first output transformer 14.
It is detachably attached to the upper part of a, and the other end is fixed to a duct 20 extending from the high frequency induction heating control panel main body 19. A pair of conductors 21a and 21b connected to the output end of the main body 19 are disposed inside the duct 20.
The flexible conductors 13a, 1 are attached to the tips of the flexible conductors 1a, 21b.
3b is connected. As shown in FIG. 5, the duct 20 has an L-shaped end bent.
By removing a stopper 20b provided on the duct 20, the bent duct portion 20a can rotate about a hinge 20c as a fulcrum in the direction shown by the arrow.

The second output transformer 14b is the first output transformer 1
4a and is fixed on a mounting table 23 attached to the second moving table device 22. The second movable table device 22 is slidably mounted on a running rail 24, and is movable in the left-right direction in FIG. 4 by a Y-direction drive motor 25.
Further, the second moving table device 22 enables movement in the x direction by moving the mounting table 23 in a direction perpendicular to the running rail 24 by an x direction drive motor 26 shown in FIG. Along with being there,
Movement in the Z direction is also possible by moving the mounting table 23 up and down by the Z direction drive motor 27. 28 is a drive wheel, 29 is a drive belt, 30 is a guide wheel, 31 is a stopper, and 32 is an underframe.
Note that terminals 33a, 33 for connection with the flexible conductors 13a, 13b are provided on the upper part of the second output transformer 14b.
b is provided.

In the embodiment configured as described above, the fourth
5 and 5 show a state in which the workpiece 34 is being molded using the first output transformer 14a, but in order to switch the frequency from medium frequency to high frequency, the first output transformer 14a must be removed. . Below is this removal operation and the second output transformer 1
The set state of 4b will now be described. First, the operations of the workpiece forming and conveying device and the high-frequency induction heating device are stopped, and then the bellows 18 on the top of the first output transformer 14a is removed, and the flexible conductors 13a, 1
3b from the terminals 17a and 17b. Then, the stopper 20b of the duct 20 is removed, the bent duct portion 20a is rotated in the direction of the arrow shown in FIG. 5, and the first output transformer 14a is lifted up by a vertical lifting device (not shown). After that, the second moving table device 2
The Y-direction drive motor 25 of the second output transformer 14b is operated to move the device 22 to the left in FIG. make it stop. At this time, each drive motor 2 in the X direction and Z direction
6 and 27 are also operated to adjust the position of the second output transformer 14b so that the work 34 can pass through the work coil 12 of the second output transformer 14b. After the positions of the work coils 12 match, the second
In order to connect the terminals 33a, 33b of the output transformer 14b and the flexible conductors 13a, 13b, the bent duct portion 20a is returned to its original position. After the above connection is completed, the bellows 18 is attached to the upper part of the second output transformer 14b to bring it into the set state shown in FIG. In this way, the second output transformer 1
4b, the output transformer can be replaced relatively easily and in a short time. Once the setting is complete, the workpiece can be formed by operating each device again.

As described above, according to the present invention, when a workpiece is heated at different frequencies in a workpath line, either the first or second output transformer can be quickly set and used depending on the frequency used. Because high-frequency induction welding at different frequencies can be performed in an extremely short time, different types of welded products can be produced in large quantities, and the equipment is simple, making it easy to set up. It has the advantage that it can be done easily and quickly.

Although the present invention has been described above in the case of an electric resistance welding steel pipe welding device using induction heating, the present invention is not limited to this, and even in the case of an electric resistance welding steel pipe welding device using resistance welding, It can be implemented in the same way and can produce similar effects.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a pipe manufacturing equipment line equipped with high-frequency induction heating welding equipment, Fig. 2 is a perspective view of the work coil section, Fig. 3 is an explanatory diagram for explaining the principle of this invention, and Fig. 4 6 to 6 show one embodiment of the present invention, FIG. 4 is a front view, FIG. 5 is a plan view, and FIG. 6 is a state in which the first output transformer is removed and the second output transformer is set. FIG. 12... Work coil, 13a, 13b... Flexible conductor, 14a, 14b... First, second output transformer, 15... First moving table device, 16... Mounting table, 17a, 17b, 33a, 33b ...terminal,
19... High frequency induction heating control panel main body, 20... Duct, 20a... Bent duct portion, 20b... Stop, 20c... Hinge, 21a, 21b... Conductor, 22... Second moving table device, 23... mounting table,
25, 26, 27...X, Y, Z direction drive motors.

Claims (1)

[Claims] 1. Two output transformers are provided that have work coils and are supplied with power from the welding device main body which is arranged close to the work path line, and both output transformers are arranged close to each other in front and behind the work path line. At the same time, both output transformers can be moved in different directions, and when heating a workpiece at different frequencies, one of the output transformers can be moved closer to the workpiece path line depending on the heating frequency. An ERW steel pipe welding device characterized by: