SU791494A1 - Apparatus for counting linear displacements of welded article - Google Patents

Description

(54) APPROACH TO COUNTING LINEAR DISPLACEMENTS OF A WELDABLE PRODUCT

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The present invention relates to the field of automation of welding processes and can be used to count the linear displacements of a welded product mainly in butt welding machines.

The optical interface sensor C of the edges being welded is known, consisting of a photodetector, illuminators, a rotating diaphragm with an opening for the passage of the luminous flux, an interface output signal generator, a second photodetector, an additional aperture segment in the diaphragm, and a coincidence circuit. The device contains a complex optical circuit including a hood, a lens, illuminators, a scanning aperture with two openings, an electric motor, a coupling capacitor, a field of view capacitor, a interface photoreceiver, a field photoreceiver, a signal amplifier for the interface, a signal amplifier for the field of view, a matching circuit, an output driver signal.20

The disadvantage of this device is the complexity of its manufacture.

The closest in technical essence is a device for counting linear displacements mainly in welders in 1X machines 2. This device contains a moire raster position sensor connected to a pulse former, a bridge circuit consisting of two differentiating chains, and a reversible counter.

The disadvantage of this device is that it does not provide high accuracy of measurement, since each input pulse of a rectangular circuit taken from the output of the former corresponds to one output pulse of the circuit fed to the input of the counter, i.e. the measurement accuracy in the best case is no more than 0.05 mm, which does not ensure the proper quality of the welded joint, mainly in welding masks.

The purpose of the present invention is to improve the quality of the welding joint by increasing the accuracy of measuring linear displacements.

The goal is achieved due to the fact that the pulse sequence conversion unit is made in the form of two pulsed

transformers, load resistors and a full-wave rectifier, while the primary windings of the pulse transformers are connected to the corresponding outputs of the square pulse shapers through the terminating resistors, and the secondary windings connected in parallel with the load resistors are connected in series and connected to the input of the Full-waveguide connector whose output is connected. input reversible counter.

FIG. 1 shows a diagram of the device; in fig. 2 - time diagrams of voltages. The device consists of a photoelectric position sensor 1, connected to a pulse generator 2 and 3, a pulse sequence conversion circuit 4, consisting of pulse transformers 5 and 6, matching resistors 7 and 8, used to match the input resistances of the windings of the pulse transformers with output resistances pulse formers, load resistors 9 and 10, full-wave top of the sensor 11 and a reversing counter 12. The device operates as follows. When the welded product is moved during the welding process at the butt welding machine from the outputs of the photoelectric sensor 1, two electrical signals are fed to the inputs of the formers 2 and 3 pulses, which they convert to rectangular pulses Vj and Vj (Fig. 2). Moreover, the pulses of one channel are shifted relative to the pulses of the other channel by 90 electrical degrees. From the outputs of pulse shapers 2 and 3, the series of rectangular pulses Vj and Vj enter the pulse sequence conversion circuit 4 via the terminating resistors 7 and 8, respectively, i.e. to the inputs of pulse transformers 5 and 6, by which they are differentiated, and from the load resistors 9 and 10, in the form of a converted series of pulses, UZ and V4 are fed to the input of a full-wave rectifier 11, where they are converted into a series of unipolar V pulses; (Fig. 1). Next, the pulses arrive at the input of the reversible counter 12, the readings of which correspond to the amount of movement of the product being welded. Thus, at the same angle of rotation of the photoelectric sensor disk instead of a single rectangular pulse, for example Vj, at time T (Fig. 2), four pulses Vs (Fig. 2) appear at the output of the pulse sequence conversion circuit 4, the measurement accuracy itself rises from 0.05 to 0.0125 mm, i.e. 4 times, which ultimately improves the quality of the welded joint.

The use of the inventive device in butt welding machines makes it possible to improve the quality of the welded joint, to eliminate expensive and laborious mechanical gears, and to reduce the dimensions of the reference device and the gear in the chain.

Claims (2)

1./iBTopCKoe certificate of the USSR No. 433981, class, B 23 K 9/10, 17.11.71. 2. USSR author's certificate number 547607, cl. At 23 K 11/00, 18.11.75.