SU1552087A1 - Magnetic tv flaw detector - Google Patents

Abstract

THE INVENTION RELATES TO NON-DESTRUCTIVE CONTROL OF MATERIALS AND PRODUCTS AND CAN BE USED DURING VISUALIZATION OF THE STRUCTURE OF THE SURFACE OF ELECTROCONDUCTING OBJECTS. OBJECTIVE OF THE INVENTION - IMPROVING THE PERFORMANCE OF THE CONTROL BY ACCOUNTING THE DETECTION OF THE SPATIAL ORIENTATION OF THE DEFECT BY A ROCKING MAGNETIC FIELD. GENERAL MOTOR SIMULTANEOUSLY ANALYZER 6 INFORMATION RECORDS AND COMPARES THE RECEIVED SIGNALS INTO EVEN AND OBSITARIAN SEMI-PERIODS. AT THE MOMENT OF EQUALSION OF SIGNALS, THE CONTROL PULSE COMES ON BLOCK 7, WHICH FORMS THE CONTROL SIGNALS PERMITTING THE RECORD OF INFORMATION IN BLOCK 3 DYNAMIC MEMORY. THE RESULTS OF THE OBTAINED INFORMATION IS DISPLAYED ON THE SCREEN OF THE VIDEO CONTROL BLOCK 4. 2 IL.

Description

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The invention relates to the non-destructive testing of materials and products and can be used in the visualization of the surface structure of electrically conducting objects.

The aim of the invention is to increase the monitoring performance by detecting the spatial orientation of the defect in a swinging magnetic field.

FIG. 1 shows a structural diagram of a magneto-television defectoscope; in fig. 2 - electromagnet construction .15

The magneto-television flaw detector contains a series-connected matrix magnetically sensitive transducer 1, a video amplifier 2, a block 3 of a dynamic strip, a video 20 control block 4, and consequently connected start button 5, one (the end of which is connected to the common wire, analyzer 6 information the second input of which is connected to the output of the 25 deamplifier 2, and the block 7 of the control pulse generator, the output of which iporo is connected to the second inputs of the dynamic memory block 3 and the information analyzer 6.

The flaw detector also contains a scanner unit 8, the outputs of which are connected to a matrix magnetically sensitive transducer 1, a dynamic memory unit 3 and a video monitoring unit 4, a series-connected clock generator 9, the outputs of which are connected to the scanner unit 8, a control pulse generator unit 7 and an analyzer 6 information, a band-pass filter 10, a phase shifter 11, two half-wave rectifiers 12 and 13, two amplifiers 14 and 15 currents and an electromagnet 16, and two-half-45 series connected in series ypr DC converter 17 whose input is connected to a bandpass filter 10 and amplifier 18 current, whose output is connected to the electromagnet 16.

The controlled article 19 is located between the electromagnet 16 and the matrix magnetically sensitive transducer 1 (Fig. 1).

The electromagnet 16 contains an annular PMO 20 (FIG. 2) with poles 21-24 mounted perpendicular to the plane of the frame 20, four windings 25-28 located at the respective poles 21-24 and two windings 29 and

thirty

35

40

five

0 5

five

0

five

0

30, located respectively at poles 23 and 24 concentrically with windings 27 and 28.

The flaw detector works as follows.

Amplifiers 14, 15 and 18 currents in the poles 21-24 of the electromagnet 16 magnetic field, the magnetization vector which continuously scans the controlled product 19. Information about the state of the controlled product 19 in the form of potential relief is scanned by a matrix magnetically sensitive transducer 1 and through video amplifier 2 enters the analyzer

6, which memorizes the maximum value of the signal in odd half-periods of scanning and compares the received signals in even half-periods. At the moment of equality of signals, the control pulse arrives at the block

7 of the control pulse generator, which generates the control signals allowing the recording of information in the dynamic memory unit 3 and blocking the operation of the information analyzer 6.

As a result, the obtained information is displayed on the screen of the video monitoring unit 4.

To resume monitoring, the information analyzer 6 is reset to the initial state.

The clock pulse generator 9 generates pulses that ensure the operation of the scanner unit 8, which synchronizes the operation of the matrix magnetosensitive converter 1 and the video monitor unit 4.

At the same time, the pulses arrive through the band-pass filter 10 and the phase shifter 11 to the inputs of the half-wave rectifiers 12 and 13 and the full-wave one rectifier. The sinusoidal phase-shifted signals thus obtained, after being amplified by amplifiers 14, 15, and 18, are fed to the coils 25-30 of the electromagnet 16, creating a swinging magnetic field.

Claims (1)

Invention Formula A magnetotelefia flaw detector containing a series-connected matrix magnetically sensitive transducer and a video amplifier, a video monitoring unit, a scanner unit whose outputs are connected to 51 a magnetically sensitive matrix node and a video monitoring unit, and an electromagnet, characterized in that, in order to increase the monitoring performance, it is equipped with a dynamic memory block, the first input of which is connected to the video amplifier, the second input is connected to the current scanner, and the output is connected to the input of the video of the control unit, serially connected by a start button, an information analyzer, the second input of which is connected to the video amplifier, and a block of the driver of control pulses, the output of which is connected to the third and the inputs of the block of dynamic memory and analyzer information serially connected clock generator, the outputs of which are connected to the block of sweeps, but H 21 to O / O 520876 a control pulse shaper unit and an information analyzer, a bandpass filter, a phase shifter, two half-wave rectifiers and two current amplifiers, whose outputs are connected to an electromagnet, and a series-connected two-half-cycle rectifier and a third An io current amplifier connected between the output of the bandpass filter and the input of an electromagnet, and the electromagnet is made in the form of an annular frame with two pairs of poles perpendicular in space 15 that are located perpendicular to the plane of the frame, two one-pair coils located on one pair of poles and two double coils wound concentrically and 20 located respectively on the second pair of poles. to 9 y g Fie.2