SU785746A1 - Flaw automatic indicator - Google Patents

Description

(54) AUTOMATIC DEFECTS SIGNALIZER

The invention relates to devices for non-destructive testing by an ultrasonic method and can be used to monitor the quality of a weld of large-diameter pipes. An automatic device is known: an initial defect detector for an ultrasonic flaw detector containing a time selector, a delay circuit, a peak detector, an OR logic unit, and a non-failure 1 . The closest to the invention in technical essence and the achieved result is automatically a defect detector, containing a selector, a pulse shaper, and a recorder, the input of which is connected to the output of the pulse shaper. The drawback of the device is the low reliability of the control, since it does not provide for the isolation and registration of a combination of defects. The aim of the invention is to increase the reliability of the control. This is achieved by the fact that the automatic defect detector provides an electric drive drum with magnetic disks, the number of which is equal to the number of limiting sizes, defects and interacting with them with recording and reading heads, measuring channels, the number of which is equal to the number of disks and each of which consists of a selector and two reversible counters, the output of one of which is connected to the input of the pulse former, the summing inputs of all the counters are connected to the output of the selector of the corresponding channel, and subtractive inputs - with reading heads, an element And, the output of which is connected to the input of the pulse shaper, and the input - to the output of another reversible counter. FIG. 1 shows an electric drum with magnetic disks; FIG. 2 is a block diagram of the device. The automatic defect signaling device contains an electric drive drum 1 with magnetic disks 2, the number of which is equal to the number of limiting defect sizes, the head of the 3 and the reading heads 4 are recorded. In addition, the automatic defect indicator device also contains measurement channels, the number of which is equal to the number of disks.

FIG. 2 shows an example of the implementation of a two-channel automatic defect detector. The first measurement channel consists of a selector 5 and two reversible counters 6 and 7. The second measurement channel consists of a selector 8 and reversible counters 9 and 10. The summing inputs of counters 6 and 7 are connected to the input of the selector 5 of the first channel, and the subtracting to the read heads 4 The summing inputs of counters 9 and 10 are connected to the input of the selector 8, and the subtracting ones - to the read heads 4.

The outputs of the counters 7 and 9 are connected to the input of the driver 11 pulses. The outputs of the counters 6 and 10 are connected to the inputs of the element And 12. The drive of the driver 11 pulses connected to the input of the recorder 13.

Automatic defecter works as follows.

The electric drum 1 rotates at a speed synchronous monitoring speed or proportional to it, so that the rotation time of the drum at an angle from the recording head to the last reading head is equal to the time of movement of the weld relative to the ultrasonic finders at a control distance.

The echo pulses detected by the flaw detector come in by selectors i and 8, each of which is set up in accordance with the norms of rejection at a certain level amplitude. The generated pulses from the output of the selector using recording heads 3 are recorded on magnetic disks 2, the same pulses are fed to the summing inputs of the corresponding reversing counters 6, 7, 9 and 10; pulses read from magnetic tape by heads 5 are fed to the subtractive inputs of reversible meters

The signals from the output of counters 7 and 9 providing the count of adjacent defects by one limit size, are fed to the input of the imaging unit 11

pulses, which produces a pulse to control the recorder 13. To register adjacent defects, several limit sizes are sent from the outputs of the counters 6 and 10 to the input of the And 12 element, from which the signal goes to the driver 11.

The automatic defect detector provides an alarm for any combination of adjacent defects at different weld lengths.

Claims (2)

1. USSR author's certificate No. 534G90, cl. G 01 N 29/04, 1975. 2. Authors certificate of the USSR 439082, cl. G 01 N 29/04, 1973 (prototype). 333 J z.