JPS5914054Y2 - Energizing device for three-phase rectifier double-headed welding machine - Google Patents

Description

[Detailed description of the invention] This invention relates to a three-phase rectifier welding machine, and in particular connects the secondary circuit from the welding transformer and rectifier to the welding head, which has a pair of upper and lower electrodes, in the shortest form possible. The present invention relates to an energizing device for a double-headed resistance welding machine that can efficiently supply welding current.

Conventionally, in the case of a three-phase rectifier double-headed welding machine, as shown in Fig. 1, the negative terminal of the welding transformer 7 disposed in the welding machine body 1 and the positive terminal from the rectifier 10 connected to the welding transformer are connected to one side, respectively. Since the secondary circuit 15 is drawn out from the main body and branched and connected to each pair of electrodes of the two sets of welding heads A and B, not only does the secondary circuit 15 become longer, but the structure becomes more complicated, and the depth of the main body increases. As the relationship becomes deeper, the structure becomes larger and the impedance increases.

This idea makes it possible to shorten the secondary circuit, simplify the structure of the welding machine, prevent an increase in impedance, supply a stable welding current between each electrode, and facilitate maintenance and inspection. It was well thought out.

Next, this invention will be explained in detail based on the embodiment shown in the drawings.

Figure 2 is a front view showing the outline of the double-headed welding machine, and Figure 3 is
The plan view of FIG. 4 shows an embodiment of the current supply device according to the invention, which is installed in the welding machine.

FIG. 5 is a view taken along the line AA in FIG. 4.

FIG. 6 is a circuit diagram of this invented welding machine.

1 is the welding machine main body, 2 is a movable electrode that moves up and down by a cylinder 4 fixed to the upper arm 3 of the main body, 5 is a fixed electrode fixed to the lower arm 6 of the main body on the axis of the movable electrode, and 7 is a welding transformer. , 8 is a first conductor connected to the negative terminal 9 of the welding transformer, and its both ends extend to both sides of the welding transformer, 10 is a rectifier connected to the positive terminal 11 of the welding transformer, and 12 is a positive terminal from the rectifier. A second conductor is connected to the welding transformer 7, and its both ends extend parallel to the first conductor 8 on both sides of the welding transformer 7.

13 has one end connected to the first conductor 8 and the other end connected to the movable electrode 2
An inverted U-shaped flexible copper plate 14 is connected to the second conductor 12 and the fixed electrode 5 side, and the copper plate 9 or more is connected to the welding transformer 7 to convert the three-phase power supply voltage to a low voltage suitable for welding. The three-phase alternating current is rectified by a rectifier 10 interposed in the secondary circuit of this welding transformer, and the three-phase alternating current is rectified by the first one connected to the upper and lower electrodes 2 and 5 provided at each welding head. Welding is performed by passing a direct current through the second conductors 8, 12 and each copper plate 13, 14 to the workpiece when the electrode is pressed.

In this case, since the structure is such that the private mass terminal of the transformer 7 and the positive terminal from the rectifier 10 are placed on both sides of the transformer, the secondary circuit can be simplified compared to the conventional three-phase rectifying double-head welding machine. It can be made shorter, prevents a decrease in welding current due to an increase in impedance, and
The depth of the main body can be made shallow and compact, maintenance and inspection are easy, and welding results can be improved, among other excellent effects.

[Brief explanation of drawings]

FIG. 1 is a plan view for explaining the energization method of a conventional double-headed welding machine. FIG. 2 is a front view of the double-headed welding machine according to this invention. FIG. 3 is also a plan view. FIG. 4 is an explanatory diagram showing an embodiment of the energizing device according to the invention. FIG. 5 is a view taken along the line A-A in FIG. Figure 6 is a circuit diagram of this invented welding machine. 1...Welding machine main body, 2...Movable electrode,
5...Fixed electrode, 7...Welding transformer, 8, 12...Conductor, 9...Minus terminal, 11...Positive terminal .

Claims (1)

[Scope of utility model registration request] A welding transformer converts the three-phase power supply voltage into a low voltage suitable for welding, and a rectifier connected to the secondary terminal of this welding transformer rectifies the three-phase alternating current. A three-phase rectifying double-head welding machine that performs pressure welding by applying a direct current to a pair of electrodes, the negative terminal of the transformer and the positive terminal from the rectifier being connected in parallel to both sides of the transformer via conductors. An energizing device formed by drawing out the conductors and connecting each of the conductors to the respective electrodes of the image prefix.