JPH028621Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a pine seam welding device that is powered by a rectifier.

[Conventional technology]

FIG. 5 is a side view of a conventional pine seam welding device, in which 1 is a movable frame, 2 is a common base on which the movable frame 1 moves;
3 is a power supply device of a welding machine attached to the movable frame 1; 4 is a secondary conductor having a pair of long straight parts through which welding current output from the power supply device 3 of the welding machine flows; 5 is a secondary conductor 4 connected to the welding machine; Connected object to be welded, 8,
A pair of rotating electrodes 9 are in contact with each other from above and below to supply a welding current, and 6 is a movable cylinder that allows the movable frame 1 to move on the common base 2 via wheels 7. In FIG. 6, 8 and 9 are the wound objects to be welded, 8 is a leading plate, and 9 is a trailing plate.

The conventional apparatus is constructed as described above, and when welding the objects 8 and 9 to be welded, as shown in FIG. 7, the ends of the preceding object 8 and the following object 9 are overlapped, As shown in Fig. 8, this is sandwiched from above and below between a pair of rotating electrodes 5, and while the welding current is applied in one direction and the rotating electrodes 5 are rotated, the overlapped portions are pressed together to form a single sheet material. Weld the whole thing to the same thickness. In this case, the rotating electrode 5
The movement is performed by a movable cylinder 6.

[Problem that the invention attempts to solve]

In the above case, the power supply device of the welding machine that supplies the welding current consists of a 6-phase single-wave rectification type or 3-phase full-wave rectification type DC device (not shown) mounted on the movable frame 1 to constitute the welding device. However, conventional power supplies had problems in that they were heavy, large, and uneconomical.

This invention was made to solve this problem, and the purpose is to obtain a lightweight and compact power supply device.

[Means for solving problems]

The pine seam welding device according to this invention has a single-phase welding transformer constituting the power supply device, a single-phase full-wave rectifier is connected to the secondary side of this transformer, and a straight section connecting the current device and the rotating electrode is connected to the single-phase full-wave rectifier. A secondary conductor with a long inductance and a large inductance is installed.

[Effect]

In this invention, a single-phase full-wave rectification method is adopted instead of a 6-phase single-wave rectification method or a 3-phase full-wave rectification method, which increases the pulsation rate, but in order to reduce this, the secondary conductor is lengthened and the inductance is increased. In order to increase the inductance, the long straight section of the secondary conductor is covered with a magnetic material via an insulator to increase the inductance.

〔Example〕

Fig. 1 is a principle diagram of a pine seam welding machine centered on a power supply device showing an embodiment of this invention, in which 3 is a power supply device for the welding machine, 4 is a secondary conductor, 5 is a rotating electrode, and 10 is a center tap. This is a current control device that switches and controls the primary side current of the single-phase welding transformer 12, and is composed of antiparallel thyristors.
11 is a current adjustment control device that controls the gate signal of the thyristor; 13 is a single-phase full-wave rectifier that performs full-wave rectification using a pair of current generators and the center tap of the single-phase welding transformer 12; and 14 is a connecting conductor. It is.

In the pine seam welding device configured as described above, the current flowing through the current control device 10 on the primary side of the single-phase welding transformer 12 is controlled, the voltage is reduced by the single-phase welding transformer 12, and the single-phase full-wave current device is used. 13 and supplies it to the secondary conductor 4. The process of welding by passing current through the rotating electrode 5 to the objects to be welded, 8 and 9, is no different from conventional equipment, but since the secondary conductor 4 is long, it has a large inductance, as shown in Figure 2. The current pulsation rate is reduced, and it can withstand use as a DC power supply even without using 6-phase single-wave or 3-phase full-wave rectified current. In order to further enhance the effect of this invention, as shown in FIGS. 3 and 4, the outer periphery of the long straight portion of the secondary conductor 4 is covered with a magnetic material 42 to insulate the secondary conductor 4 and the magnetic material 42 by casting. It is fixed with an insulator 41 such as a material. As a result, by passing the magnetic flux generated by passing current through the secondary conductor 4 through the magnetic material 42, it is possible to increase the inductance, and since most of the magnetic flux flows through the magnetic material 42, it magnetizes the surrounding structural materials. There's nothing to do. The secondary conductor 4 constituting such a long straight portion is detachably connected to the connecting conductor 14 at both ends. Note that it is practical to divide the secondary conductor for ease of casting. Furthermore, in Figures 3 and 4, the magnetic material 4
2 surrounds the entire circumference of the secondary conductor 4 and there is a gap to prevent magnetic saturation.

Furthermore, the power supply device of this invention can be applied not only to pine seam welding equipment but also to ordinary welding machines with a short secondary conductor 4 by using the secondary conductor 4 covered with a magnetic material 42 as shown in Fig. 3. .

[Effect of idea]

As explained above, this idea integrates the welding machine's power supply with a current control device, the center tap with a single-phase welding transformer, and a single-phase full-wave rectifier, thereby reducing the size of the welding machine. Compared to a power supply device that uses 3-phase full-wave rectification, it is about 1/3 the weight and about 1/2 the size, making it more economical.

[Brief explanation of drawings]

Fig. 1 is a principle diagram of a pine seam welding machine centered on the power supply device, which shows one embodiment of this invention.
The figure shows the rectified voltage and current waveforms when using an embodiment of the present invention. Figure 3 shows the secondary conductor covered with a magnetic material and fixed with a cast insulator to further reduce the pulsation rate. Figure 4 is a plan view of a secondary conductor covered with a magnetic material and fixed with a cast insulator, Figure 5 is a side view of a conventional pine seam welding device, and Figure 6 is a side view of a conventional pine seam welding device. FIG. 7 is a side view of the preceding workpiece and the following workpiece; FIG. 7 is a perspective view of the overlapping ends of the preceding workpiece and the trailing workpiece; FIG. A front view of the workpiece immediately before welding is shown with the welded part in between. In the figure, 4 is a secondary conductor, 5 is a rotating electrode,
8 and 9 are objects to be welded, 10 is a current control device,
12 is a single-phase welding transformer, 13 is a single-phase full-wave rectifier, 41 is an insulator, and 42 is a magnetic material. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A single-phase welding transformer, a current control device provided on the primary side of this single-phase welding transformer, and a single-phase connected to the secondary side of the single-phase welding transformer. full wave rectifier,
A pine seam welding device comprising: a secondary conductor having an inductance through which a welding current rectified by the single-phase full-wave rectifier flows; and a rotating electrode that supplies the welding current from the secondary conductor to a workpiece. (2) The pine seam welding device according to claim 1, wherein the outer periphery of the secondary conductor is covered with a magnetic material via an insulator.