SU1250420A1 - Welding apparatus - Google Patents

Description

IGHORNING related to welding P welding machines can be used for welding in protection gato.

The aim of the invention is to improve the welding quality, increase the reliability and cost-effectiveness of the device operation by improving the arc firing conditions, ensuring its steady burning at the beginning of the welding cycle and pulse control of the dynamic braking of the electrode wire feed motor.

Figure 1 shows the structural diagram of the device; Fig. 2 is a schematic diagram of the device.

The device includes a trigger 1, to the counting input of which the start button 3 is connected to the third input of the switch 2 of the type of work via the I-NO element, the Start button 3 is also connected to the fifth input of the block 2, the third output of which is connected to the second input of the element AND-NO.

The first input of block 2 and 1, the K inputs of trigger 1 are connected to one of the terminals of the power supply.

The inverse output of the trigger 1 is connected to the fourth input of unit 2. The direct output of trigger 1 is connected to the second input of the unit 2 switching the type of work and through the spreading diode 4 with the circuit 5 of the time delay for switching the trigger. The direct output of trigger 1 is also connected via an isolation diode to the second output of block 2 and to its own S input. The fourth output of the work switching unit 2 through the dynamic braking pulse shaper 6. is connected to the controller (dynamic brake thyristor 3 electrode 3: connected in parallel with the electrode wire feeding engine 8.

The first output of the work switching unit 2 is connected via the first output of the time delay circuit 9 of the welding power source and the thyristor switch 10 to the switching on relay source 11, and through the adjustable time delay circuit of the motor 12 to the feed motor control unit 13 and with the control electrode of the starting thyristor 14. The second output of circuit 9 through the circuit 15 of the gas delays and thyristor

50420:

the key 16 is connected to the solenoid valve 17 of the gas cutter. The electrode wire feeding engine 8 is connected to the power source 5 through the starting thyristor 14 and the resistor 18. The first output of the block 2 is also connected to the third input of the first element I 19, the first input of which is connected to the first output of the block 13

10 feed control engine. Between the second and third inputs of the unit 13 are connected in parallel to the thyristor 7 of the dynamic braking and the motor 8. The input of the imaging unit 6 through the second

t5 element And 20 is connected to the fourth output of block 2.

The device works in the following way.

In the mode of welding with long seams

20 (button is turned on in block 2 of switching of the type of work) after pressing the start button 3, the switch-on signal through the AND-NOT circuit enters the counting: trigger input 1 and is set. it is in the zero state (Fig. 2). The signal from the inverse output of the trigger 1 through the circuit 9 of the time delay of switching off the source of welding current includes a thyristor key

30 10, which, in turn, controls the relay 11 to turn on the welding source, and through the circuit 9, the circuit 15 of the gas delays, the thyristor switch 16 turns on

, valve 17 gas trimmer. In addition, the signal from the inverse output of the trigger 1 with a time delay determined by the circuit 12 of the adjustable time delay for switching on the engine and sufficiently accurate for obtaining a stable blowing of the gas-fusion welding zone through the element 19 with the help of the feed motor control unit 13 and the starting thyristor 14 includes an electrode wire feed motor 8. The welding process begins.

After releasing the trigger button 3, the described state of the circuit is saved.

When the start button 3 is pressed again, the trigger 1 switches to the initial state. The zero signal of the inverse output of the trigger 1 through the circuit 12, the element 19 and the block 13 55 of the motor control for the feed motor shuts off the starting thyristor 14, and through the driver 6 pulses: 1ms of the dynamic braking turns on the thyristor 7

dynamic braking. The duration of the process of dynamic acceleration braking is determined by the parameters of the elements of the driver 6 of the dynamic braking pulse. After a certain time set by the parameters of the circuit 9 of the time delay for switching off the source of welding current, the thyristor switch 10 and the relay 11 for switching on the source of welding current are turned off, and then for the time determined by the parameters of the circuit 15 for gas delay, the thyristor switch 16 and valve 17 of the gas section are turned off . The entire circuit returns to its original state.

When the button is turned on in work switching unit 2, which corresponds to the point welding mode, the operating state of the circuit is determined by the duration of the charge and discharge of the capacitor in circuit 5 of the switch trigger time delay. When the start button 3 is pressed, the welding process starts in the sequence described above, and after some time, determined by the parameters of the elements of the circuit 5, the circuit returns to the initial state. If the start button 3 is pressed while the process is repeated.

When you turn on the button in block 2, switch the type of work, which corresponds to welding with short seams,

the welding time is determined by the duration of the on state of the start button 3. When it is released, the circuit returns to its original state, as described above. With

This trigger 1 does not take part in the work.

The application of the proposed device allows to reduce the number of defective products as a result of

improving the arc ignition conditions and ensuring its steady burning at the beginning of the welding cycle, as well as reducing energy consumption and increasing reliability

devices due to the pulse triggering of the thyristor dynamic braking.

Editor L. Veselovska

 2

Compiled by V.Tkachenko

Tehred O.Gortvay Proofreader I.Musk

Order 4364/13 Circulation 1001Subscription

In SHIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

A DEVICE FOR WELDING in a shielding gas medium, containing a power source, a series-connected starting thyristor, an electrode wire feed motor and a resistor, a control unit for the feed motor, a dynamic braking thyristor connected in parallel with the feed motor, a trigger, a type of work switching unit, an AND-NOT element, the first and second elements And, the outputs of which are connected respectively to the first input of the control unit of the feed motor to one of the outputs of is-. power supply unit, the first and second inputs of the first AND element are connected to the first outputs of the feed motor control unit> and the type of work switching unit, the second output of the last is connected to the trigger installation input, the third output is to the N-HE element input, and the fourth output is with the inputs of the second element And, characterized in that, in order to improve the quality of welding, reliability and efficiency of the device, it introduced a scheme of adjustable time delay for turning on the engine and a dynamic pulse shaper braking, while the input of the latter is connected to the output of the second element And, and the output is connected to the control electrode of the dynamic braking thyristor, the input of the adjustable time delay circuit of the engine is connected to the first output of the switching unit of the kind of work and the second input of the first element And, and the output of the circuit is connected to the third input of the first element I. (put t t