SU532047A1 - Ultrasonic device for detecting defects in the thickened and threaded part of the drill pipe - Google Patents

Description

one

The invention relates to a means of destructive testing, namely, the installation device for ultrasonic testing of the thickened and threaded part of the drill pipe.

A well-known ultrasound machine for detecting defects in a thickened and threaded part of a drill pipe, containing a series-connected ultrasonic echo-pulse flaw detector with a strobe I1M generator; pulsOB ZONES of the Automatic Control and an amplifier of the echo-Silnals, on the CLOCK finder, the inclined search head with an electric drive, made in the form of reversing mechanism with control winding and kinematically connected with the holder, power supply to the control winding of the reversing mechanism, block controlling a monostable multivibrator with two, three coincidence circuit and three switching circuits, the first of which has a normally open contact, a normally closed contact of the second and the third - the two normally closed and two normally open contacts.

The lack of installation is that all control operations are carried out manually, thereby affecting the subjective factor in the implementation of operations.

control and, in addition, they work productivity.

In order to increase the Reliability and speed of control in the proposed installation, the output of the gating pulse generator of the flaw detector's automatic control zone is connected to one of the inputs of the first Matching Scheme and to the input of the first waiting multivibrator, the output of which is connected to one of

the inputs of the second Matching circuit and with the input of the second standby multivibrator, the output of the second standby multivibrator is connected to one of the inputs of the third match circuit, the second inputs of all three match circuits are connected to the output of the echo pulse amplifier, each of the outputs of the match circuit is connected to the corresponding switching circuit, control The reverse winding mechanism is connected to the power supply in the phase

one pin through serially connected Normally open contact of the first switching circuit, through HOpMavibHo closed contact of the second switching circuit and through a Normally closed contact

the third switching circuit, the other output through the normally closed contact of the third switching circuit, both terminals of the control winding are in antiphase connected to the power supply via 1NO (p: 1 open T1 of the third switching circuit.

The drawing shows a block diagram of the installation.

The installation contains a series-connected ultra-sonic pulsed echo defectocop 1 with a generator of strobe pulses of the automatic control zone and an amplifier of echo sound channels, a-clone finder 2 with a carbon element 3, an inclined sear holder ("not shown) with an electrically operated driver. in the form of a recursive 1mechanism 4 with a control winding 5, a control unit with two pending multivibrators 6 and 7, three matching circuits 8, 9 and 10, and three switching circuits 11, 12 and 13.

The 1: 1 switching circuit has a normally open 14 contact; The switching circuit 12 is a normally closed contact 15, and the switching circuit 13 is two holes | Really closed contacts 16 and 17 and two normally open contacts 18 and 19. To adjust the width of the automatic control zone of the echo pulse detector 1, a variable resistor 20 is used that is included in the circuit strobe generator.

The installation works as follows.

Probe I: a pulse through a layer of immersion fluid 21 is introduced into the body of the test tube 22 in the direction of its thickened part. Reflected oscillations after conversion and amplification come to the vertical deflection plates of the cathode ray tube of the echo-pulse flaw detector in the form of echo pulses. Due to the supply to the horizontal deflection plates of the tube of an echo-pulse flaw detector, a sweeping voltage, a probe pulse and an echo pulse from defect 1B in the threaded and raised part and from the protruding drill pipe 22 on the screen are separate. The time interval between the probe pulse and the echo pulse from the pipe end is the largest, and all the echo pulses from defects are located between them.

On the tube of the echo pulse flaw detector 1, a rectangular gating pulse is also visible, the width of which is set to the length of the thickened part of the tube 22 on a scale, and the back front is set resistor 20 close to the front edge of the echo pulse from the end of the tube 22, but not overlapping it. The back edge of the strobe-pulse of the automatic control zone of the echo-pulse flaw detector 1 starts the waiting multivibrator 6, which generates a pulse with a duration equal to the duration of the echo pulse from the pipe pushing. The rear edge of the pulse of the multivibrator 6 starts the standby multivibrator 7, which generates a pulse with a duration corresponding to the margin of the maximum possible distance of the searcher 2 from the end of the pipe 22.

The strobe pulse of the strobe pulse generator of the automatic control zone of the echo pulses of the flaw detector 1 is fed to one input of the matching circuit 8, the pulse of the multivibrator 6 arrives at one input of the matching circuit 9, the pulse of the multivibrator 7 arrives at one input of the matching circuit 10. The second inputs of the icxeM 8, 9 and 10 coincidence come from the pulse-echo flaw detector, echo impulses from defects in the threaded and thickened part of the pipe 22, and an echo pulse from the end of the pipe 22. When the pulses coincide in time from the strobe pulse generator or from the multivibrator 6, or from the second multivibrator 7 with echo pulses from defects or from the pipe end at the outputs of circuits 8, 9 and 10 coincidence, a signal appears, controlling through switching circuits AND, 12 and 13, respectively, by the operation of the reversing mechanism 4.

So, if the searcher 2 is at the desired, predetermined distance from the end of the pipe 22, a signal appears at the output of the second coincidence circuit 9 by which the circuit is interrupted through the circuit 12 with the contacts 15

the control winding 5 of the mechanism 4. And even in the presence of a defect, in this case, the searcher 2 remains in place.

If the finder 2 is located at a distance of less than or greater than the setpoint from the pipe end, a signal appears at the outputs of the circuits 8 or 10, respectively, which causes the power to be connected to the control winding of the reversing mechanism 4 and the searcher is moved to the required distance.

Tests of the installation described have shown that supplying it to the control units of the position of the ultrasonic finder makes it possible to withstand the distance of the inclined finder from the end of the monitored pipe to a constant and equal to the distance previously determined on the test pipe sample when detecting defects in the drill pipe. given frame size, which leads to

reducing the time and increasing the reliability of the control.

Claims (1)

Invention Formula Ultrasonic device for detecting defects in a thickened and threaded part of the drill pipe, containing a series-connected ultrasonic echo pulse detector with a gating pulse generator of the automatic control zone and an echo amplifier, an inclined finder, an inclined sear holder with an electric drive, made in the form of a reversing mechanism sending winding and kinematically connected with the holder, the power source of the control winding of the reversing mechanism, the control unit with two pending multivibrators, three coincidence circuits and three switching circuits, the first of which has a normally open contact, the second normal closed contact, and T1 third - two normalized contacts Closed and two normally open KOHTaiKTa, Distinguished from the fact that, in order to increase the reliability and speed of coitrol, the output of the strobe pulse generator of the automatic control zone of the aktopope unite. From the inputs of the first matching circuit and to the input of the first standby multivibrator, the output of which is connected to one of the inputs of the second coincidence circuit and to the input of the second standby multivibrator, the output of the second standby multivibrator is connected to one of the inputs of the third coincidence circuit, the second inputs all three coincidence circuits are connected to the output of an echo pulse amplifier. Each of the outputs of the coincidence circuits is connected to the corresponding switching circuit, the control winding is reversible (the mechanism is connected to a power source in One pin through the serially connected normally open contact of the first switching circuit, through the "normally closed contact of the second switching circuit and through the normally closed contact of the third switching circuit, the other output through the normally closed contact of the third switching circuit, both of the control windings in antiphase are connected to power supply through the normally open contacts of the third switching circuit. . R