SU1562083A1 - Arc length regulator - Google Patents

Abstract

The invention relates to the welding industry, namely to equipment for welding non-consumable electrode structures with a curvilinear profile. The purpose of the invention is to improve the accuracy and speed of the adjustment process. The arc length regulator contains a torch with a drive for its movement, a drive for moving the electrode collet, two comparison elements, two error amplifiers, two reference sources, an adder and a sensor for positioning the electrode collar relative to the burner. Two mutually dependent contours of stabilization of the electrode positions relative to the burner are used in the controller. The collet drive is capable of responding quickly to changes in the length of the arc gap. The burner travel actuator aligns the position of the burner with the electrode. The controller allows to improve the dynamic properties of the processing of the disturbing effect of the arc length. 1 il.

Description

The invention relates to the welding industry, namely to equipment for welding non-consumable electrode structures with a curvilinear profile.

The purpose of the invention is to improve the accuracy and speed of the process of regulation of the welding process.

The drawing shows a block diagram of the arc length regulator

The arc length regulator contains a burner 1 with a drive 2 of its movement, a drive 3 of movement of the collet of electrode 4, the first 5 and second 6 reference elements, the first 7 and second 8 error amplifiers, the first 9 and second 10 sources of the reference signal, the adder 11 and the sensor 12 the position of the collet relative to the burner, the first input of the first comparison element 5 is connected to the output of the first source 9 of the reference signal, the second input to the collet of the electrode 4, the output to the first input of the adder 11 and through the second error amplifier 8 to the drive of the 3 movement of the electro collet ode 4, a first input of the second element 6

comparison is connected to the output of the second source 10 of the reference signal, the second input to the output of the position sensor 12, the output through the adder 11 and the first error amplifier 7 to the actuator 2 of the movement of the burner 1

The drive 2 of the movement of the burner 1 is made on the basis of an electric motor with a gearbox. The actuator 3 for moving the collet of the electrode 4 can be made, for example, on the basis of an electric motor or an electromagnetic coil with a ferromagnetic rod mounted on the collet of electrode 4. Sensor 12 is of a potentiometric type, for example, PSP-3 (in case of operation with an electric motor) or current shunt (in the case of an electromagnetic coil)

The regulator works in a manner.

The operator on the first source 9 of the reference signal sets the signal size proportional to the required length of the arc gap, on the second source 10 of the reference signal - signal values,

sd

O5

to

oo oo

proportional to the position of the end of the electrode 4 relative to the end face of the burner 1.

During the welding process, the measured voltage on the electrode 4 is compared with the installation of the first source 9 of the reference signal in the first comparison element 5, the error signal of which affects both the drive 2 through the adder 11 and the first error amplifier 7 and the drive 3. The latter works faster the perturbation of the measured voltage on the electrode 4 by moving the collet of the electrode 4 relative to the end of the burner 1. In this case, the signal of the position sensor 12 causes the error signal to appear at the output of the second el Comparison 6, which through the adder 11 and the first error amplifier 7 controls the operation of the drive 2 in the direction of establishing a predetermined distance between the end of the electrode 4 and the end of the burner 1, which causes the collet of the electrode 4 to move in the opposite direction with the rate of change of the distance between the end of the burner 1 and product. Thus, the arc length regulator tends to maintain a stable distance between the end of the electrode 4 and the product (the length of the arc gap), as well as between the end of the electrode 4 and the end of the burner 1, which creates the possibility of fast testing of repeated disturbances. The efficiency of the regulator lies in the best dynamic properties of processing arc length disturbances with repeated sharp changes in the relief of the weld line,

which improves the quality of welded products.

The arc length regulator was tested on a model of an automatic arc welding machine, shell

designs.

Claims (1)

Invention Formula The arc length regulator when welding a product with a non-consumable electrode, containing a torch with a drive for its movement, a drive for moving the electrode collet, a first reference element, two error amplifiers, a first reference source, the output of the first error amplifier is connected to a drive for moving the burner, a first reference signal source, is connected to the first input of the first comparison element, the second the input of which is connected to the electrode collet, and the output of the first reference element through the second 0 the error amplifier is connected to the drive of the electrode collet movement, characterized in that, in order to improve the accuracy and speed of the control process, a second reference source, a second comparison element, an adder and a collet position sensor relative to the burner connected to the first input of the second element are additionally introduced comparison, the second input of which is connected to the second source of the reference signal, and the output is connected to the first input of the adder, the second input of the adder is connected to the output of the first element comparison, and output - with the input of the first error amplifier.