SU60217A2 - Modification of the device for automatic electrode feed during arc welding according to author's certificate No. 48931 - Google Patents

Description

The main author's certificate No. 48931 describes a device for automatically submitting a welding electrode at a collector motor of alternating current.

In this motor, the part of the winding of the core was made closed through the additional middle brush to reverse (the engine), while the other part of the winding of the core included resistance adjustable depending on the arc voltage to change the feed rate.

This device (as well as other known automatic heads for electric arc welding, in which the electrode feed control is carried out by means of electromagnetic relays with breaking contacts) has two drawbacks: 1) the time required for the relay to operate reduces the dynamic qualities of the heads: 2) the burning of contacts requires constant maintenance, which lowers the performance of the head.

To eliminate these deficiencies (supplied in the device according to the author's Certificate Ws 48931, instead of adjusting Resistance and control equipment, use an additional transformer with differential windings attached to the brushes of the collector engine, respectively.

The invention is illustrated in the drawing, which shows the basic electrical circuit of the device.

As from the drawing, to the main 1, 2 and to the additional medium 3 brushes of the collector engine 12 AC, windings 5 and 6 of an additional low-power transformer are attached.

The winding 6 of the additional transformer is connected in series to the circuit between the NOY brush 3, which reverses the measles, the engine 12, and the end of the secondary winding 7 of the welding transformer CT.

Another breaker 5 additionally; t. About the transformer is connected in parallel to the electrodes of the 9-arc; so that the magnetic flux created by it is directed towards j to the winding flux 6.

The parameters of the windings 5 and 6 must be calculated in such a way that, when the arc voltage is working (about 18 volts) to below to zero, the winding 5 induces 6 electromotive force in the winding, a load that minimizes the current in the winding 6 .

The motor 12 for supplying the electrode 9 (AC collector) has a shunt excitation winding 4 supplied from the voltage of the secondary winding 7 of the welding transformer CT.

The armature of the motor 12, connected parallel to the arc (electrodes 9-10) through the main brushes 1-2, rotates in the direction of supplying the electrode with a variable speed depending on the length of the arcs. The passage of a current between brushes 1-3 causes a reversal of the core and the separation of electrode i from electrode 9, i

The brushes 1-2 of the engine are set-i- relative to the poles of the I-chromatnite on the repulsion mode of the engine. Driven to the motor korya 12 current from the welding transformer flows between the brushes 1-2 and 1-3 in the same direction as the current induced in. winding box

In the absence of an arc, i.e., at the RESET of the welding transformer, the current flows through brushes 1-2, and the measles rotate in the direction of supply of the electrode 9 to the product.

For THIS, winding 5 of an additional transformer, being under one voltage, will induce in the winding 6 electromotive force, compensating, due to the voltage drop on the part of the winding zhor between the main and additional (middle) brushes.

As a result, there will be no current in the reversing brush circuit 3, and

kor1r will be only under

.C action of the current flowing between the brushes I-2 and causing, the flow of the electrode.

When electrodes 9-10 are short-circuited, the winding 5 of the additional transformer is short-circuited and, turning into a secondary secondary winding of the transformer, will lower the reactance of winding 6 to miniMum, as a result of which the BI part of the winding of the core between; - Measles on the separation of the electrode 9 with the formation of the arc.

When the arc in the winding 5 of the additional transformer is burning, the current again decreases, which reduces the current to the winding 6 to Zero, as a result of which Anchor 12 changes the direction of rotation in the direction of supply of the electrode.

When the arc is shorting, the electrode's feed rate will decrease: 1) due to the voltage drop on the brushes 1-2 and 2) braking with a current in the winding portion of the winding between the brushes, and the braking will be proportional to the voltage drop across the arc.

As the arc length increases, the electrode feed rate will increase due to an increase in voltage across the arc and on brushes 1 and 2.

The present invention.

Modification of the device for automatic electrode welding during arc welding according to the author's certificate No. 48931, that is, that, instead of regulating resistance and control equipment, an additional low-power tra was used, one winding: parallel to the arc, while the ends of the second winding are connected between the reversing brush and the secondary winding of the welding transformer so that, when idle, the action of both windings is mutually compensated.