RU3234U1 - CONTACT DOT ELECTRIC WELDING DEVICE - Google Patents

Abstract

A device for contact spot electric welding, comprising a welding transformer, a control system for the welding current pulse on the trinistor, a Start button and electrodes, characterized in that the control system for the welding current pulse includes a switch for setting the welding current value, a switch for setting the duration of the welding pulse, a signal generator the beginning of the half-periods of the mains voltage, the shaper angle of the shift angle of the pulses of unlocking the trinistor, the clock generator, the counter-selector number half-periods in the welding current pulse and the shaper of unlocking the trinistor, and the outputs of the signal generator of the beginning of half-cycles of the mains voltage and the setting switch of the welding current are connected to the inputs of the shaper angle of the shift pulses of the unlocking of the trinistor, the Start button is connected to the input of the clock generator, the outputs of the duration setting switch of the welding pulse and the generator of clock pulses are connected to the inputs of the counter-selector of the number of half-cycles in the pulse of the welding t ka, angle generator outputs shift pulse and firing SCR-selector counter number of half-periods of the pulse welding current connected to the inputs of the pulse SCR firing, pulse shaper output unlocking connected to the control electrode of SCR, the output SCR is connected to the input of the welding transformer.

Description

LJ 5 in 23 to II / IO 5 V 23 K II / II 5 V 23 K 13/28

DEVICE FOR CONJECT POINT OF ELECTRIC WELDING

The invention relates to the field of electric welding, in particular, to portable devices for contact spot welding.

Known small in size stationary capacitor machines for contact spot welding / I /. These capacitor machines are characterized by the lowest energy consumption and are intended for welding parts of small and unequal thickness from relatively ductile metals.

The disadvantage of all capacitor machines is the hard and relatively little change in the shape of the current rush, which limits the possibilities of their application.

The closest technical solution to the claimed is a portable apparatus for spot welding / 2 /. The device consists of two main catches: an electronic relay on a trinistor and a portable welding transformer. A welding electrode is connected to one of the terminals of its low-voltage secondary winding, the second terminal is reliably connected to the more massive of the two parts to be welded. The network winding of the welding transformer is connected to the network through a diode bridge, the diagonal of which includes an electronic relay trinistor. A low-power auxiliary transformer feeds the Trinitor control circuit ... and the spotlight of the welding spot. The pulse duration of the welding current is determined by the parameters of the time-generating discharge PC circuit when a charged capacitor is connected to the control electrode of the trinistor.

The main disadvantages of this portable apparatus for spot welding are:

- firstly, the magnitude of the welding current in it is not regulated. The regulation of the welding current is especially important in the transition from welding, for example, parts from steel to welding parts from non-ferrous metals;

secondly, the stability of the pulse duration of the welding current is determined by the variation of all parameters of the discharge CS circuit.

These shortcomings, of course, limit the technological possibilities of using the described portable apparatus for spot welding of parts of various thicknesses and metals.

The technical solution is based on the task of expanding the technological capabilities of a device for contact spot electric welding by providing the ability to accurately set both the duration and the magnitude of the welding current pulse.

The problem is solved in that in a device for contact spot electric welding containing a welding / i transformer, a control system for the welding current pulse on the trinistor, a start button and electrodes, a control system for the welding current pulse includes a switch for setting the value of the welded current, a switch for setting the duration of the welding pulse , a signal generator of the beginning of half-periods of the mains voltage, a shaper angle of the shift angle of the pulses to unlock the trinistor, a clock pulse generator, counting IR selector half cycles of welding current in the pulse shaper and pulse firing SCR, wherein the signal generator outputs the start of half-periods of the mains voltage and the setting value of the welding current switch connected to the input of the shift angle shshulsov trinistor unlocking button connected to the trigger input of the clock generator

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pulses, the outputs of the switch for setting the duration of the welding pulse and the generator of clock pulses are connected to the outputs of the counter-selector of the number of half-cycles in the pulse of the welding current, the outputs of the shaper of the angle of shift of the pulses of unlocking the trinistor and the counter-selector of the number of half-periods in the pulse of the welding current are connected to the inputs of the generator of pulses of the unlocking of the trinistor, moreover, the output of the shaper unlock pulses of the trinistor is connected to the control electrode of the trinistor, and the output of the trinistor is connected to the input welding transformer.

As follows from the description of the essence of the utility model, it implements such a control system for the pulse of the welding current, which made it possible to set the number of half-cycles for unlocking the trinistor and thereby ensure that the exact value of the duration of each pulse of the welding current is set. In addition, the introduction of setting the value of the shift of the control pulse relative to the zero value of the sine wave of the mains voltage provides an exact value in each half-period of the triggering moment of the trinistor, that is, the control of the perfect pulse of the welding current (soft or hard rare welding).

This made it possible to significantly expand the technological capabilities of the device for contact spot electric welding of parts in a wide range of thicknesses from a wide variety of metals.

Laboratory tests of the utility model confirmed the high technological capabilities of the device and its control system for the pulse of the welding current in comparison with similar devices.

Based on the foregoing, we can conclude that in this device as a whole, all of the specified set of essential features, both known and off-beat, has a causal relationship with the achieved result, i.e., thanks to this set of essential features, a device for CONTRAFT

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spot welding is simple in design, skewed, with great technological capabilities and less energy intensive.

The drawing shows a block diagram of a device for contact spot electric welding.

A device for contact spot welding includes a welding transformer I with electrodes 2, a control system for the welding current pulse on the trinistor 3, including a start button 4, a switch 5 for setting the welding current value, a switch 6 for setting the duration of the welding pulse, a generator 7 for signaling the beginning of half-periods of the mains voltage, shaper angle of shift and IVffly unlocking the trinistor 3, the generator 9 clock pulses, the counter-selector 10 the number of half-cycles in the pulse of the welding current and Only II pulses for unlocking the trinistor 3. Output: Generator 7 signals for the start of half-cycles of the mains voltage and a switch for setting the welding current value are connected to the inputs of the trimmer & the shift angle of the unlock pulses of the trinistor 3, the Start button 4 is connected to the input of the generator 9 clock pulses. The outputs of the switch 6 setting the duration of the welding pulse and the generator 9 clock pulses are connected to the inputs of the counter-selector 10 of the number of half-cycles in the pulse of the welding current. The outputs of the shaper angle 6 of the shift pulses of unlocking the trinistor 3 and the counter-selector 10 of the number of half-cycles in the welding current pulse are connected to the inputs of the shaper II of the unlock pulses of the trinistor 3. The output of the shaper II of the unlock pulses of the trinistor 3 is connected to the control electrode, and the output of the trinistor 3 is connected to the input of the welding transformer I. The mains power supply is connected to the trinistor 3 and the generator 7 of the beginning signals of the half-periods of the mains voltage.

The signal generator 7 of the beginning of the half-periods of the mains voltage is working out, corresponding to the beginning of a half-period of the mains voltage. In accordance with these signals and the position of the switch 5 for setting the welding current value, the shaper II of the unlock pulses of the trinistor 3 generates pulses with the necessary angle of shift relative to the end of each half-cycle of the mains voltage. When you press the start button 4, the clock generator 9 generates and feeds the clock pulses to the counter selector

10 numbers of half-cycles in the welding current pulse, which, in accordance with the setting of the switch 6 for setting the welding pulse duration, transmits a predetermined number of pulses to the shaper

11 pulses of unlocking the trinistor 3. Shaper II supplies this number of control pulses to the trinistor 3 taking into account the shift angle specified by the shaper 8 of the shift angle of the pulses of unlocking the trinistor 3. The mains voltage is supplied to the primary winding of the welding transformer I, in the secondary winding of which, connected with electrodes 2 through the welded parts, a pulse of the welding current occurs. The next time you press the start button 4, the operation of the device is repeated.

A model of a portable device for contact spot electric welding was developed and manufactured at the Institute. The device proved to be convenient, npocTbnvi and reliable in operation, providing, for example, high-quality welding to metal parts of a wire mesh of 0.07 mm, petals to batteries, welding of sheet stainless metal with a thickness of 0.1-g1, and UM to massive steel parts.

SURFACE SOURCES

I. Book by B.D. Orlov Resistance Welding Technology and Equipment, Moscow Engineering 1986, pp. 194-195 Fig. 5.49. 2. Papenin V. Portable Radio, No. 12, 1976, S. 47-49. Head of the department technologist:

// .ionnm shm marine. apparatus for spot welding, V.I. Kron

Claims (1)

A device for contact spot electric welding, comprising a welding transformer, a control system for the welding current pulse on the trinistor, a Start button and electrodes, characterized in that the control system for the welding current pulse includes a switch for setting the welding current value, a switch for setting the duration of the welding pulse, a signal generator the beginning of the half-periods of the mains voltage, the shaper angle of the shift angle of the pulses of unlocking the trinistor, the clock generator, the counter-selector number half-periods in the welding current pulse and the shaper of unlocking the trinistor, and the outputs of the signal generator of the beginning of half-cycles of the mains voltage and the setting switch of the welding current are connected to the inputs of the shaper angle of the shift pulses of the unlocking of the trinistor, the Start button is connected to the input of the clock generator, the outputs of the duration setting switch of the welding pulse and the generator of clock pulses are connected to the inputs of the counter-selector of the number of half-cycles in the pulse of the welding t ka, angle generator outputs shift pulse and firing SCR-selector counter number of half-periods of the pulse welding current connected to the inputs of the pulse SCR firing, pulse shaper output unlocking connected to the control electrode of SCR, the output SCR is connected to the input of the welding transformer.