SU1290155A1 - Ultrasonic flaw detector - Google Patents

Abstract

This invention relates to the field of non-destructive testing of welded joints. The purpose of the invention is to increase the efficiency of the control by ensuring the time of electricity consumption only in the measurement cycle. The power of measuring blocks 11-22 comes only when the amplitude of the signal from the defect exceeds a predetermined level and the second trigger 27, controlled by the signal of the Comparators block 9, receives a signal at the input of the third key 29, which will supply power to the specified blocks . 1 il. i (L

Description

This invention relates to non-destructive testing and can be used in ultrasonic flaw detection.

The purpose of the invention is to increase the efficiency by ensuring that the time of electricity consumption is only in the measurement cycle.

The drawing shows a block diagram of an ultrasonic flaw detector.

Ultrasonic flaw detector contains synchronizer 1 connected in series and first frequency divider 2, ultrasonic oscillator 3 in series electro-acoustic generator, transmitting 4 and receiving 5 piezotransducers and cathode-ray tube 6, generator strobe pulses connected in series, selector 8, the second input connected to the output of the piezoelectric transducer 5, the block 9 of the Comparators and the first indicator 10, connected in series generator 11

exponent 11, and the third key 2 by the first input connected to the output of the second trigger 27, the second input to the first output of the power supply unit 23 to the second input of the first key 25, and the output to the power supply circuits of the sweep generator 21, the first one-channel 19, the first trigger 20, since we are 12 comparisons, generator 1.1 eq fO ponents, generator 13 interval of circuit 15, second divider 16 of frequency, counter 17, second indicator 18 and generator 22 of pulses and power supply circuits of the other blocks are - J5 connected to the second output of block 2 meals.

The flaw detector works as follows.

20 Synchronizer pulses 1 through the first divider 2 chats and switch 28 start-up generator 3 ultrasonic oscillations, with the help of which radiating piezo-transform

exponential circuit 12, comparison, excites. impulses in the product.

eye input connected to the output of the selector 8, the interval imager 13, switch 14, AND circuit 15, second frequency divider 16, 1 counter 17 and second indicator 18, first connected one-one vibrator 19 and the first trigger 20, the second input to the output of the selector 8, and the output to the second input of the switch 14, a sweep generator 21, an output connected to the second input of the cathode ray tube 6, a pulse generator 22, an output connected to the second input of the AND circuit 15, and a power supply unit 23 Serially connected second single-wave the torus 24 and the first key 25, the output connected to the second input of the receiving piezoelectric transducer 5, the second key 26 and the second trigger 27 connected in series, the second input connected to the second output of the comparators block 9, and output to the first input of the second key 26, switch 28, the first and second inputs are connected to the outputs of the first splitter 2 frequency, the third input to the output of the second trigger 27, and the output -. to the inputs of the generator 3 ultrasonic vibrations, the generator 7 strobe pulses, the first one-oscillator 19, the generator 21 sweep, the second one-oscillator 24, the second inputs of the second key 26 and the generator 11 of the exponent, and the third key 29, the first input connected to the output of the second trigger 27 , the second input to the first output of the power supply unit 23 and the second input of the first key 25, and the output to the power supply circuits of the scanning generator 21, the first one-oscillator 19, the first trigger 20, the comparison circuit 12, the generator 1.1 ex-fO components, the former 13 intervals, schemes And 15, the second frequency divider 16, the counter 17, the second indicator 18 and the pulse generator 22, and the power supply circuits of the remaining blocks are connected to the second output of the power supply unit 23.

The flaw detector works as follows.

20 Synchronizer 1 pulses through the first divider 2 chats and switch 28 launch the generator of 3 ultrasonic oscillations, by means of which the radiating piezoelectric transducer

ultrasonic vibrations, which are reflected from a defect, are fed to a piezoelectric transducer 5 and through a selector 8 to a circuit for measuring the coordinates of a defect consisting of the first one-vibrator 19 setting zero and the first trigger 20 of the depth gauge, and a circuit for measuring the amplitude of a pulse reflected from the defect,

consisting of a comparison circuit 12, an exponential generator 11 and an interval generator 13. With the outputs of the first trigger 20 and the former 13 interval time proportional

according to the coordinates of the defect, the amplitude of the signal reflected from the defect is transmitted through the switch 14 to the digital indication circuit of the measured values, consisting of

And 15, the second frequency divider 16, the counter 17 and the second indicator 18 and the pulse generator 22, whose frequency is selected depending on the measurement mode. From the output of the selector 8, the signal also enters the comparators block 9, S of which its amplitude is compared with threshold levels, which correspond, for example, to the search,

control and first rejection. The first indicator 10 indicates that the amplitude of the signal from one of the indicated levels is exceeded. Visual indication of the signals is carried out31

with using cathode-ray tube 6 and the generator 21 sweep.

In the process of scanning the monitored product, when the amplitude of the signal from the defect is less, for example, a search control or other established levels, from the power supply unit 23, the supply voltages are fed to all the blocks, except for blocks 11-22. The above-mentioned level from the second trigger 27, controlled by the signal of the comparators block 9, to the input of the third key 29 receives a control signal that opens the key and through it the supply voltages are fed to the blocks 11-22. In this case, the operator will be able to determine and fix the monitored parameters of the defect using the cathode ray tube 6 and the second indicator 18.

Due to the fact that the blocks will consume electricity only

during the measurement of the defect characteristics by the operator and taking into account the fact that the defect level, as a rule, does not exceed 10%, there will be significant energy savings, which is especially important when powering 30 flaw detector from an autonomous power source.

For the same purpose, pulsed power is supplied to the receiving piezoelectric transducer 5 using a primary switch 25 and a second one-oscillator 24.

At the same time, the control signal from the second trigger 27 is fed to the input of the switch 28, which switches the output of the first divider 2 frequencies so that the synchronization pulse frequency of the entire flaw detector increases to the maximum possible value.45 In the initial state ( at a small amplitude of the signal from the defect) the frequency i of the synchronization of the flaw detector will be minimally possible, which also contributes to the increase in the cost-effectiveness of the de-50 fektoskop.

The second key 26 provides the necessary state of the second trigger 27 until the amplitude of the reflected signal from the defect exceeds the specified level.

Thus, given that the measurement operations are

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Claims (1)

no more than 10% of the working time of the flaw detector, the power consumption is reduced by about 2 times, as a result of which the service life of the batteries is increased. Invention Formula An ultrasonic flaw detector containing a series-connected synchronizer and a first frequency divider, a series of electro-acoustically connected generator of ultrasonic vibrations, transmitting and receiving piezo transducers and a cathode-ray tube, a series-connected strobe pulse generator s selector, the second input connecting to the output of the receiving piezo transducer, the comparators block and the first indicator, a series-connected exponent generator, a comparison circuit, a second input connected interval selector, a switch, an AND circuit, a second frequency divider, a counter and a second indicator, the first one-oscillator and the first trigger connected in series, the second input connected to the output of the selector, and the output to the second input of the switch, a sweep generator, an output connected to the second input of the electron beam tube, a pulse generator, an output connected to the second input of the AND circuit, and a power supply unit, characterized in that, in order to improve efficiency, it is equipped with by the second one-oscillator and the first key, the output connected to the second input of the receiving piezotransducer, connected in series by the second key and the second trigger, the second input connected to the second output of the comparators, and the output to the first input of the second key, the switch, the first and second inputs connected to the outputs the first de-, frequency, the third input - to the output of the second trigger, and the output -. house - to the inputs of the generator of ultrasonic oscillations, the generator of strobe pulses, the first one-vibrator, the generator of the sweep, the second one-vib. the second inputs of the second key and the exponent generator, and the third key, the first input connected to the output of the second trigger, the second input to the first output of the power supply and the second input of the first key. 512901556 and the output to the power supply circuits of the general frequency divider, the counter, the second sweep, the first one-indicator and the pulse generator, the first trigger, the comparison circuit, and the power supply circuits of the remaining 6locks | generator, exponent generator, form-. connected to the second output of the interval interval block, AND circuit, and the second power supply.