SU117151A1 - Device for switching on welding semiautomatic hose - Google Patents

Description

The invention relates to devices for switching on a welding semiautomatic hose by closing an electrode with a product. The known devices of this kind, also containing a contactor in the primary circuit of the welding transformer, an intermediate relay for starting the electrode supply drive, understood that a transformer for powering the control circuit and a button on the electrode holder for switching on the intermediate relay do not eliminate the possibility of switching on the welding transformer if the electrode is accidentally touching with the product. To eliminate this drawback, it is proposed to include normally open block contacts of an intermediate relay in the coil circuit of the contactor, to turn on the welding current into the circuit of the contactor, and when operating from the welding converter, block the contacts of the intermediate relay through two additional relays into the circuit of the welding contactor coil and magnetic starter, including; its drive motor converter.

FIG. 1 shows the electrical circuit of the proposed device for welding with alternating current; in fig. 2 is a diagram of a device for direct current welding.

In the welding circuit 1 is turned on contactor 2. Three-phase auxiliary transformer 3 through an intermediate relay 4 provides power to the electric drive 5 of the electrode feed. Button 6, located on the electrode holder, serves to turn on the intermediate relay and start the electrode supply drive. Time relay 7, control is used; it turns on the contactor 2, has a time delay for switching off and prevents the contactor from turning off during short breaks of the welding current. In DC welding, a transformed 117151 is used.

breeder S (Fig. 2). The drive motor of the converter is connected to a three-phase network 9 by means of a magnetic starter 10 activated by a second time relay 11. The normally open contact 12 of an intermediate relay 4 controls the time relay to turn on and the contactor and magnetic starter on. The capacitor 13 slows down the switching off of the relay 7 and thus prevents the welding weld from breaking if there is a short break in the welding current. Button 14 and switch 15 serve to start the welding converter.

Before the welding patch, the welder presses button 6, after which the relay 4 is activated and the electrode wire begins to flow. When the electrode closes with the product, the relay 7 and /) is turned on, and then the contactor 2 and the starter 10. In the absence of welding current, the contactor 2 is turned off and the welding electrode is de-energized.

The circuit eliminates the possibility of switching on the welding voltage at random contact of the electrode with the product and increases the safety of the welder.

Subject invention

Claims (3)

1. A device for switching on a welding semiautomatic hose by closing an electrode with a product containing a contactor in the first | IC of the welding transformer, an intermediate relay for starting the electrode supply drive, a step-down transformer for supplying the control circuit and a button on the holder of the semi-automatic device for switching on an intermediate relay, characterized by that, in order to prevent the welding transformer from turning on if the electrode accidentally touches the product, normally open blinds are included in the contactor coil circuit to contacts intermediate relay. 2. The device according to claim 1, characterized in that the contactor is included in the secondary welding circuit. 3. The device according to paragraphs. 1 and 2, it is different to the teMa that when welding with direct current from the welding transducer, the block contacts of the intermediate relay are connected through two additional relays to the coil circuit of the welding circuit contactor, as well as to the coil circuit of the magnetic starter, including the drive motor of the transducer. Priority under paragraphs 1 - 1 April 1954 Priority in paragraphs. 2 and 3 - 21 February 1958 0 0 i J