SU492797A1 - Electromagnetic flaw detector - Google Patents

Description

(54) E / SHKTROMAGNITNY DEFEKTOSKOP

I The invention relates to the means of electro-magnetic structuroscopy of products and can be used to control and sort out conductive materials. A known electromagnetic flaw detector containing a vortex-current converter and a signal analyzer for its duration and amplitude associated with it is an input. However, the performance of control sorting operations when applying a known flaw detector is insufficient. The selector of signals, in terms of duration and amplitude, in a known flaw detector is made in the form of successively connected triggers and a generator of counting pulses. The aim of the invention is to improve the performance of control and sorting operations during the inspection of moving products. For this, the analyzers in duration and amplitude are made in the form of a trailing unit, connected to it by the I amplitude discriminator and the comparator unit, one input of which is connected to the amplitude discriminator input, connected to another time master input and electrical signal and defect counters connected to the outputs of the decision block. The drawing shows a structural electrical diagram of the flaw detector. The electromagnetic flaw detector contains a generator 1, connected to it by an eddy current converter 2, which is connected via detector 3 to a signal analyzer in duration and amplitude, consisting of amplitude discriminator 4 connected to one of the inputs of the comparison unit 5, which is connected to the second input setting unit 6 time intervals, decisive unit 7, connected by inputs with amplitude discriminator 4 and comparison unit 5, and outputs with counters 8, 9, 10 defects, converter 11 for moving the product into electric the signal connected to the output of the unit timers 6 time intervals. j The flaw detector works as follows: ob-1

I The generator 1 excites the converter 2, the output signal of the latter nocTj is passed to the detector 3, On the output of the detector 3 it is selected around the detector and fed to the discriminator 4 and the comparison unit 5. To the other input of the block S, pulses are sent from the setter of 6 time and 11 intervals. Depending on the duration of the signal coming from detector 3, a signal appears at one of the outputs of block 5. Signals from discriminator 4 and block 5 are sent to the inputs of decision block 7. Block 7 sends current pulses to one of counters 8, 9, 1O depending on the depth

defect.

Block 7 is a decoder that outputs signals equivalent to the dependencies of the signal parameters of converter 2 on the length and depth of defects. The setting device 6 time intervals is controlled by the Converter 11.

Thus, the recognition of defects in depth is based on their length and

{regardless of the speed of movement of the product.

Claims (1)

Invention Formula V Electromagnetic flaw detector containing a vortex current converter and a signal analyzer for its duration and amplitude associated with its input, jO, different in that, in order to improve the performance of control-sorting operations during flaw detection of moving products, the signal analyzer for duration and amplitude is designed as a decision block, the outputs of the amplitude discriminator and the comparison unit, which one input is connected to the input of the amplitude discriminator connected to another input time slots and a product speed converter into an electrical signal and defect counters connected to the outputs of the decision unit.