SU932397A1 - Flaw analyzer for ultrasonic flaw detector - Google Patents

Description

The invention relates to non-destructive ultrasonic testing and can be used to control welds, etc.

Known automatic signaling device of defects to an ultrasonic flaw detector containing a series-connected threshold cascade and a normalizer. Pulses l.

The disadvantage of the known signaling device is its low reliability1, since it is impossible to separate defects by conditional length, number de | ectov, distance between adjacent defects, etc. .

The closest to the proposed technical essence and the achieved result is a defect analyzer for an ultrasonic flaw detector containing a threshold stage, a pulse normalizer, a counter and the first reversible counter connected to the output of the pulse normalizer, and a recorder, the first input of which is connected to the output of the first reversible counter 21 .

The disadvantage of the known analyzer is that the control quality is low, since it is impossible to determine a valid or invalid defect.

The purpose of the invention is to increase the reliability of the control.

This goal is achieved by the fact that the analyzer is equipped with BKJra4eH between the pulse normalizer and the recorder, serially connected shift register, inverter, multivibrator and selector, the second input of which is connected to the output of the shift register, as well as sequentially connected integrator whose output is connected to the second counter input , and the second reversive counter, the second input of which

15 is connected to the output of the shift register and the I circuit, the first input of which is intended to be connected to the first output of the flaw detector, the second input to the output of the shift register,

20 and the output to the second input of the first reversible counter, the first input of the pulse normalizer is designed to connect to the first output of the flaw detector the second input to the output of the threshold stage, the second input of the shift register is to connect to the first output of the flaw detector, and the input of the threshold cascade is connections to the second flaw detector input. FIG. 1 shows a block-cJceMa analyzer; FIG. 2 shows temporary diagrams explaining the operation of the circuit. The defect analyzer to the ultrasonic flaw detector contains a series-connected threshold cascade 1, the input of which is designed to connect to the output of the osprey defect 2f normalizer 3 pulses, shift register 4, inverter 5, multivibrator 6, selector 7 and register K. To exit the normalizer 3 the first reversible counter is connected 9 and a counter 10. Between the normalizer of 3 pulses and the recorder 8 are connected in series a tegrator 11 and a second reversing counter 12. In addition, the analyzer contains an AND 13 circuit, the first input to which It is designed to connect to the first output of the flaw detector 2, the BT input to the output of the 4th shift register and the output to the second input of the first reversible counter 9, the second input of the selector 7 and the second input of the second reversible counter 12 are connected to the output of the 4th shift register. the normalizer 3 is intended to be connected to the first output of the flaw detector 2. The second input of the counter 10 is connected to the output of the integrator 11, and the output to the input of the recorder 8. The second input of the 4th shift register is intended to be connected to the output of the defective step 2. Analyzer of work defects is hardly follows. In the initial position, the shift register 4 and the counters 9, 10, and 12 are set to O via dump tires (not shown). The automatic flaw detector flaw detector 2 detects echo signals from defects transmitted through its threshold device adjusted to the threshold level. Echo pulses 14 (figure 2), not passed through this level and passed through the level of Vy ,. the threshold device 1 is passed through the normalizer 3 for further processing of information. The normalizer 3 is controlled by the clock pulses of the synchronizer of the flaw detector 2 ,. which also arrive at the clock input {shift pattern 4 and the AND 13 circuit. The series of normalized pulses 15 inputted to the shift register 4 are written as 1 with each clock pulse. When there are no pulses at the input, information is entered into register 4 as 0. The separation of defects according to the allowable distance between them is performed with the following procedure. The series of pulses corresponding to the reflections from the defects, the passage through the shift register 4, are removed from its output in the form of pulses 16 corresponding to the envelopes of the series. The leading edge of the level O, which corresponds to the leading edge of the envelope of the series of echoes from the defect, closes the output of the selector 7 and, passing through the inverter 5, starts the delayed multivibrator 6. The pulse duration 17 of the latter is chosen that corresponds to the minimum acceptable distance between the defects. If the defects are relative to each other at such a distance that the duration of the reference pulse of the delayed m-ulturbator b is longer than the pause time between adjacent defects, the selector 7 opens, and part of the pulse 17 of the multivibrator b hits the recorder 8 {defects . The separation of defects into permissible and unacceptable by the number of them in a given area is carried out using an integrator 11, the output of which removes the envelope of a series of echo signals 16 from the defect entering the control area} and enters the input + reversible counter 12. Input - counter 12 is fed from the output of the register 4 shift of the envelope of the series of echo signals from the defect leaving the monitored section, read out of the counter 12. The capacity of the latter corresponds to the allowable number of defects in the section exceeding which about incorporated recorder 8. The operation of separation defects on valid and invalid by the extension of the conditional is effected by means of the counter 10, which calculates the number ehonmpulsov in series from one of the defect or defects in the chain, located close to each other. Counter 10 is reset by the reset input of the back edge of the envelope pulse from integrator 11. If counter 10 is filled before the arrival of the reset pulse, then the defect recorder 8 switches on, indicating an unacceptable conditional length of the defect. The inspection of the controlled product according to the total conditional length is performed by a reversible counter 9. Normalized from the output of the normalizer 3 are fed to the input + it. Echo pulses from the defect entering the control zone, and clocking pulses are received to the input through the AND 13 circuit if there is a shift potential 1 (the envelope of a series of echoes from a defect leaving the control zone) When counter 9 is filled up to a certain level that fixes the presence of a defect in the control zone with a total length of more than Ustimov, turned on the recorder 8.

The present invention allows to increase the reliability of control due to the fact that the separation of defects into acceptable and unacceptable is ensured.

Claims (2)

1. Equipment and control systems, 1E78, 6, p. 36 2. USSR author's certificate on application 2977874 / 25-28, five cl. G 01 N 29/04, 1980 (prototype). / " LUjL-jJU Mr. & Mr. | Mr. "-," JlTYTTiriTinnnnirL JULfLJUL-JU eleven eleven