SU1232410A1 - Apparatus for monitoring the position of axis of rib welded to sheet of non-magnetic material - Google Patents

Description

 one

The invention relates to the field of control of welding work and can be used in the robotization of welding work, in particular in the process of electron beam welding of strips, strips of non-magnetic materials.

The aim of the invention is to improve the accuracy of controlling the position of the axis of a closed joint when welding non-magnetic materials.

FIG. 1 shows a circuit diagram of the input part of the device; in fig. 2 is a block diagram of the proposed device.

The device contains a converter 1 fed from a sinusoidal voltage generator 2, a balanced diode bridge 3, storage capacitors A and 5, a differential amplifier 6 with a paraphase output, a main 7 and additional 8 comparison circuits, an integrator 9, a source 10 of the reference voltage, the OR 11 element to two inputs, trigger 12 with separate inputs, two matching circuit 13, reference frequency generator 14, 15 pulse pulses, digital readout block 16, key 17, sign trigger 18 with separate inputs and 19 clock oscillator pulse in. The output of converter I is connected to the supply diagonal of a balanced diode bridge 3, whose measuring diagonal, loaded on storage capacitors 4 and 5, is connected to the inputs of differential amplifier 6 with a paraphase output (Fig. 1). The outputs of amplifier 6 (Fig. 2) are connected with the first inputs of the main 7 and additional 8 comparison circuits, the second inputs of which are connected through the integrator 9 to the source 10 of the reference voltage, and their outputs to the inputs of the OR 11 element to two inputs, the output of which is connected to the reset input of the trigger 12 with and the output of the latter is connected to one of the inputs of the circuit 13 for two inputs, the second input of which is connected to the output of the reference frequency generator I4, and its output is connected to the input of the pulse counter 15 connected to the digital reference unit 16, voltage power supply to which is supplied via the key 17, the control input of which is connected with the inverse output of the trigger 12 with separate inputs, the outputs of the main 7 and an additional 8 circuits

five

2A

5 0 5 50 55

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The comparisons are connected to the inputs of the sign trigger 18 with separate input-, the output of which is associated with the sign discharge of the digital reference block 16. The output of the generator 19 clock pulses connected to the installation input of the trigger 12 with separate inputs and to the reset input of the counter 15 pulses. In manual marking, the converter 1 (FIG. 1) is placed in the zone of the intended location of the rib on the sheet (shelf) and is moved to the left or right. Converter 1 is a W-shaped core, on the extreme rods of which there are two identical windings. The width of the middle rod, which ensures the passage of magnetic fluxes through the edge, is approximately equal to the thickness of this edge.

The device works as follows.

If the axis of the converter 1 does not coincide with the axis of the welded edge, the inductance of one of the windings of converter 1 decreases and the other increases, and the voltages proportional to the differences of currents in these windings, balanced by diode bridge 3 on the storage capacitors 4 and 5, are equal and the polarity is the opposite. This polarity is reversed with the opposite displacement of the axis of the transducer I with respect to the axis of the weld edge. Voltages from storage capacitors 4 and 5 are fed to the inputs of the differential amplifier 6, which sets the response thresholds of the main 7 and an additional 8 comparison circuits, to the second inputs of which a linearly increasing voltage of positive polarity is obtained, obtained by integrating the DC voltage. the output of the source 10 of the reference voltage by the integrator 9. When the linearly increasing voltage reaches the threshold value, the comparison circuit is activated, to which the positive threshold level is applied, and it depends on the direction of the displacement of the axis of the transducer 1 relative to the axis of the weld edge, depending on how the comparison circuit is triggered, the signed trigger 18 with separate inputs is set to the corresponding state that is registered

3

in the sign bit of the digital readout block 16, and regardless of how the comparison circuit is triggered, the OR element 11 resets the trigger 12, which is pre-cocked with a signal from the generator output 19 clock pulses. As long as trigger 12 with separate inputs is in a single state, the integration of the reference voltage occurs, after which integrator 9 is zeroed. The number of pulses of the reference frequency generator 14 transmitted to the counter 15 pulses from the output of the circuit 13 is coincident, proportional to the voltage difference at the output of the differential amplifier 6 with a parafasm 1 m output.

Thus, the code in the pulse counter 15 is proportional to the magnitude of the displacement of the axis of the transducer 1 relative to the axis of the weld edge. A clock generator 19 performs the function of a control unit and receives pulses with a high duty cycle and a long period. The duration of its pulses must be less than the oscillation period of the reference frequency generator 14 in order not to introduce an error in the measurement results. During this pulse, zero

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a pulse counter 1b and a trigger 12 are cocked with separate inputs. During the pause between the generator pulses of 19 clock pulses, two 5 operations occur: measuring and recording the measurement results. The measurement corresponds to a single state, trigger 12, and registration corresponds to its zero state. For the time of recording the measurement results, the key 17 is opened by a signal from the inverted output of the trigger 12 and supplies the power voltage to the digital reference unit 16, which registers the value

t5 and the sign of the displacement of the axis of the transducer 1 relative to the axis of the weld edge.

The use of the proposed device will improve the accuracy of determining the position of the axis of the welded rib to a sheet of nonmagnetic materials when welding through the shelf to the point of contact without scanning the transducer across the axis of the welded edge.

In addition, the device can be used to control the position of the welding machine head, which simplifies the process of welding automation.

Sheet (full)

Redr axis - (closed joint)

FIG.

2

Claims (1)

DEVICE FOR MONITORING THE POSITION OF THE AXIS POSITION OF THE WELDED RIB TO A SHEET OF NONMAGNETIC MATERIALS, comprising a converter, a differential amplifier, an integrator, a basic comparison circuit, a trigger, a matching circuit, a reference frequency generator, a pulse counter, a digital reference unit and a clock pulse generator, the direct output of the differential amplifier being connected to one of the inputs of the main comparison circuit, the other input of which is connected to the output of the integrator, characterized in that, in order to improve the accuracy of monitoring the position of the axis An open joint, a sinusoidal voltage generator, a balanced diode bridge, two storage capacitors, a reference voltage source, an additional comparison circuit, an OR element, an iconic trigger and a key are inserted into the device, the converter is made in the form of a U-shaped core made of ferromagnetic material, the extreme rods of which are two identical windings, the beginnings of which are connected and connected to a sinusoidal voltage generator, and the ends of the windings are connected to the inputs of a balanced diode bridge, the output is sine wave voltage through the converter and the balanced diode bridge is connected to direct and inverse inputs of the differential amplifier, and storage capacitors are connected to each of these inputs, the inverse output of the differential amplifier is connected to one of the inputs of the additional comparison circuit, the other input of which is connected through the integrator to the output of the source reference voltage, and the outputs of the main and additional comparison circuits through an OR element are connected to the trigger input of the trigger, whose inverse output connected to the control input of the key, the input of which is connected to the power source, and the output with the digital readout unit, the outputs of the main and additional comparison circuits are connected to the corresponding installation inputs of the sign trigger, the output of which is connected to the input sign of the digit discharge of the digital readout unit. 1232410 A1