SU1260845A1 - Ultrasonic flaw detector - Google Patents

Abstract

The invention relates to non-destructive testing and can be used to control materials, surfaces and products. The aim of the invention is to increase the monitoring performance by controlling the speed of movement of the converter. The ultrasonic flaw detector contains a comparator and two time relays connected to the control inputs of the scanning unit, which allows the scanning speed to be adjusted depending on whether there is a transducer in the defective or defect-free zone. 1 il. i (L

Description

The invention relates to non-destructive ultrasonic testing and can be used to control materials and products.

The aim of the invention is to increase the monitoring performance by controlling the speed of movement of the converter.

The drawing shows the block diagram of the ultrasonic flaw detector.

The ultrasonic flaw detector contains a scanning unit 1 with a transducer 2 located on it, a synchronizer 3 connected in series, an ultrasound signal generator 4 electro-acoustically connected to a transducer 2, an amplifier 5, an amplitude-time selector 6, also designed for connecting with an electronic computer 10, a comparator 7, the first 8 and second 9 time relays, the inputs connected to the output of the comparator 7, the output of the first time relay 8 is connected to the first input of the scanning unit 1, the output of the second relay 9, time is connected to the second input of the scanning unit 1, the third input of which is connected to the output of the comparator 7.

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Ultrasonic flaw detector works as follows.

The synchronizer 3 starts the generator of ultrasonic vibrations 4, the pulses from which are fed to the transducer 2 located on the scanning unit 1 and moving with a certain speed relative to the surface of the product under test. The signals reflected from the defect are converted in converter 2, amplified by amplifier 5, selected in selector 6, and can be fed to a computer for further processing. The signal from the output of selector 6 also goes to a comparator 7, which produces a back pulse ( reverse). This pulse arrives at the third input of the control circuit of the electric motor of the scanning unit 1 and at the first time relay 8, which can be made as a one-shot calculated for the time required to return the converter 2 to a place somewhat preceding the first defect signal, t. e. signal from comparator 7 (on the forward movement of the electric motor

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by inertia and back to the beginning of the defect). Converter 2 begins to move back before arriving at the first input of the motor control circuit.

5 block 1 pulse scan from the output of the first time relay 8. At this point, converter 2 begins to move forward again, but at a slower rate, at which it is necessary to monitor, in order to reliably and accurately determine its size and appearance.

defect. Impulse from the first relay 8

time enters the second input

time relay 9, to the second input of which a signal is supplied from comparator 7. From the output of the second time relay 9, a pulse is fed to the second input of the motor control circuit. The second time relay 9 is designed for

20, the time required for the converter 2 to move at the second low speed to the site of the initial impulse about the defect from the comparator 7, and is made in the form of a single extended-length bracer whose capacitance has a forced reset through the resistance and a key with impulses from the comparator 7. If there is no repetition of the defect from the comparator 7 during the forward run of the converter at low speed, i.e. the comparator 7 was triggered by interference; the monitoring time at low speed is determined by the time of charging the one-shot capacitor. When signals are received about the presence of a defect from the comparator 7 to the second input of the second relay 9, time is earlier than the capacity of the one-shot is charged,

40, it is forcibly discharged through the key. Thus, the duration of a one-shot pulse is overcome until there is a pause between the impulses about the defect, a longer

45 the installation time of the one-shot second time relay 9 (i.e., this duration is determined by the resolution of defects). The signal from the second time relay 9 to the control circuit of the electric motor starts up again the initial forward movement of the converter 2 to. The appearance of the next defect.

The monitoring performance increases due to the fact that in non-defective areas the transducer moves at a faster speed than in the defective area.

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Claims (1)

Invention Formula Ultrasonic flaw detector containing a scanning unit with a transducer located on it, serially connected synchronizer, ultrasonic signal generator, electro-acoustically connected to the transducer, amplifier, amplitude-time selector, designed to be connected to the input of the electronic computer, and L.Povkhan editor. Compiled by L.Ivanov-Sheitz Tehred L. Serdyukova Proofreader E. Sirohman Order 5223/44 Circulation 778 Subscription VNIIPI USSR State Committee on the cases of inventions and discoveries T13035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 608454 Rotor, characterized in that, in order to increase reliability and performance, control, it is equipped with series-connected first and second time relays, inputs connected to the output of the comparator, the output of the first time relay is connected to the first input of the scanning unit, the output of the second time relay is connected to the second input of the scanner, the third input of which is connected to the output of the comparator.