RU6355U1 - PLASMA CUTTING AND ARC WELDING PLANT - Google Patents

Description

PLANT FOR PERMANENT CUTTING AND

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The proposed utility model relates to the field of welding, namely to welding power sources and can find application in the design and manufacture of plasma cutting systems that can work in the same way as multi-point power sources for arc welding.

A well-known welding rectifier VSS-300-3 is in which the switching of the modes high currents - low currents is carried out by switching the transformer windings, respectively, according to the schemes triangle - triangle or star - star (Welder's manual edited by V.V. Stepanov, M. Mashch / nostroenie, 1975 p.73). This allows you to stepwise adjust the welding current, but does not allow plasma cutting due to insufficiently high operating voltage.

The prototype of the proposed utility model is the prior art technique of series connection of several welding power sources to increase the operating voltage (Welding in mechanical engineering, vol. 4, M. Mechanical Engineering 1979, S.305X. This technique is not effective enough, therefore, to obtain the characteristics necessary for implementation of plasma cutting, often it is necessary to use three or even more welding power sources.

The current range switch widely used in the VD-306 welding rectifiers is widely known in the art. In one position of this switch, the upper terminals are connected in pairs with the lower ones, and in the other three upper terminals are connected to each other (Welding rectifier type VD-306 UZ, passport ЗДЯ.940.187 00 ПС, ОКП 34 4184Х Thus, the transformer winding is switched from the triangle to the star circuit, however, this does not allow switching the control system of the power source from the cutting mode to the welding mode and vice versa.

The technical result, which is aimed at arc welding

The proposed utility model is the possibility of using the minimum number of universal power supplies: for plasma cutting and for arc welding.

Obtaining the indicated technical result is ensured by the fact that in the installation for plasma cutting and arc welding, consisting of two or more welding power sources, the transformer windings of which are connected in the welding mode according to the triangle - triangle or star - star scheme, as well as the control system, In cutting mode, the transformer windings are connected in a triangle-star pattern. In the mode switch, in the first position, the upper terminals are paired with the lower ones, and in the second, the upper terminals are interconnected, but in the second position only the two upper terminals are interconnected, and

the third remains unconnected. Such universal power sources are not known from the prior art; therefore, the proposed utility model has novelty. The proposed utility model can be used in welding production, so it has industrial applicability. The installation and the switch for it constitute a single creative concept, therefore the requirement of the unity of the utility model is met.

Figure 1 shows the inclusion of power supplies in the plasma cutting mode, figure 2 - in the arc welding mode, and Fig.Z - connection options terminal mode switch.

In the plasma cutting mode СФиг.1J the windings of step-down transformers of two welding rectifiers ClJ and С23 connected in series with СЗ) are connected according to the delta-star circuit, which provides the operating parameters necessary for plasma cutting. The positive pole of the unit is connected to the product, and the negative pole to the torch.

In the arc welding mode, СFig. 2), these windings are switched on according to the triangle - C4D triangle or star - C5 star) scheme, and the power sources are disconnected from each other, resulting in two independent power sources for arc welding, the positive and negative poles of which are connected to the electrode about the holder of the Burner 3Z and the product in accordance with the selected polarity. The inclusion of the windings according to the triangular-triangular or star-star scheme depends on the range of operating currents for each of the sources.

The mode switch can provide two options for connecting the terminals Sfig.Z ;: pairwise connection of the upper terminals with the lower C6) and the connection of the two upper terminals with an unconnected third C7D. This makes it possible to turn on and off the control system of the installation in plasma cutting mode.

Claims (1)

Installation for plasma cutting and arc welding, which includes two or more welding power sources, each of which contains a transformer, as well as control equipment, characterized in that one or each of these power sources is equipped with a mode switch that provides inclusion in the plasma cutting mode windings of their transformers according to the triangle - star scheme, and in the arc welding mode - according to the triangle - triangle or star - star scheme.