SU1169793A1 - Device for automatic control of welding circuit in arc welding - Google Patents

Description

The invention relates to the welding industry, in particular, to devices for remote control of the welding chain.

The purpose of the invention is to increase the reliability of the device by exciting the arc after the electric circuit prepared for welding, i.e. when all inertial elements are included. Preparation of the welding circuit is carried out remotely, directly from the workplace without additional wires. In this case, the converter is turned on by using a high-resistance resistor, and disconnection is due to the use of a low-resistance resistor.

The drawing is a diagram of the device.

The device contains a source of welding current 1, an auxiliary transformer 2, a coil of time relay 3, which by its contact 4 turns off the contactor 5, which by contact 6 turns off the power of the welding current. Contact 7 of the contactor is included in the welding circuit, a time relay 8 is installed in the primary circuit with contacts 9 and 10 that disconnect the auxiliary network. Coil 11 of the relay is designed to remove the voltage from the electrode. Contacts 12 and 13 of the relay 11 breaks the power supply circuit of the relay coil 14. Contact 15 of the relay 14 disconnects the power supply circuit of the coil of the relay 11, respectively, and contact 16 of the same relay turns on the coil of the contactor 5. The contact terminal 17 of the contactor 8 provides self-supply of the welding current source. The locking diode 18 serves to eliminate false positives of the circuit. The resistor 19, the external resistor, is designed to operate the relay 11. The resistor 20, the external resistor, is intended to operate the relay 14. The electrode 21 is closed to the resistor 19 when the power is turned off by the welder himself. The weldment 22 is a return wire (grounded).

The device works as follows.

Before welding, the electrode 21 is closed on the resistor 20, as a result of which the relay 14 is turned on with a short time delay (~ 0.2 s) (the relay 11 does not turn on, because the resistance of the resistor 20 is selected as high-resistance, and the coil of the relay 11 is low-resistance. 11 is triggered by contact with a low-resistance resistor 19.

The relay 14 with its contacts 15 breaks the power supply circuit of the relay coil 11 and with contact 16 turns on contactor 5, which supplies power to the welding current source (contact 6) and turns off the welding circuit (contact 7) with power contacts, and the block contact 17 takes on self-powering .

Time relay 3 is energized. It is turned on, and the processing of the time delay for turning off the contactor 5 begins, if within a set time (1 s) welding has not started. After 1 time relay 3, contact 4 disconnects contactor 5, which opens contacts 6 and 7. If welding has started, current relay 8 will operate and, with contacts 9 and 10, will turn off the auxiliary transformer 2 and time relay 3, respectively.

When the welder himself needs to remove the voltage from the electrode and simultaneously turn off the power supply to source 1, electrode 21 is connected to the resistor 19. This activates relay 11, the response time of which is chosen to be less than relay 14 (~ 0.1 s). Pins 12 and 13 turn off the contactor 5, respectively, and the power supply circuit of the relay coil 14. Contactor 5, pins 6 and 7, turn off the power supply and the welding circuit.

Accidental short circuits of the electrode to the product do not cause the welding current source to spontaneously turn on in the power supply network, as first the relay 11 is triggered, which, by contact 12, breaks the power supply circuit of the coil 8 of the contactor 5. The welding circuit will only include the relay 11. The power contact 7 and the locking The diode 18 serves to eliminate the false positives of the circuit.

The device allows you to save electricity both at direct and at alternating current; reduce the inertia of the circuit when the arc is excited, as the welding circuit is prepared for welding; to carry out full welding and voltage recovery from the welding site almost instantly (the response time of the relay and contactor is 0.15 s).

1169793

Claims (1)

DEVICE FOR AUTOMATIC CONTROL OF A WELDING CIRCUIT WITH ARC WELDING, containing a welding current source, an auxiliary transformer, the primary winding of which is connected to the device input, a time relay with a series-connected normally closed current relay contact, a contactor whose contacts are installed in the primary and secondary sources of the source the coil is included in the circuit of the series-connected time relay contacts and the contactor blocking contact, as well as a separation diode, characterized in that, in order to increase When welding with AC and DC by using a high-resistance resistor to turn on the primary and secondary circuits of the source and a low-resistance resistor to disconnect, the first and second relays are inserted in the device, and the coils of the relay are connected in parallel to each other through normally closed contacts of each other, respectively , while the common point of contact is connected through the normally closed contact of the current relay and the isolation diode to one output terminal of the device, the other common point of the coils is rela It is connected to one end of the secondary winding of the auxiliary transformer and to the coil of the contactor, in the circuit of which the normally closed contact of the first relay and the normally open contact of the second relay are connected in parallel with the contactor contact, the second Ι / Λ end of the secondary winding the transformer is connected to the second output terminal of the device, and the time relay coil with a current relay contact is connected to the input of the source through the current relay coil. 1169793 1169793