SU862056A1 - Automatic plant for complex non-destructive testing - Google Patents

Description

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I The invention relates to the medium 5tvg1M nondestructive quality control of materials and products, in particular to the integrated control of rolled products on the basis of ultrasonic and eddy current testing methods. .

Closest to the invention of the technical nature and the achieved result is the automatic installation of a complex week of destructive control, containing converters, an adjustment and changeover mechanism, and a signal processing unit of the converters 3 using the defective TP9 UJ marker.

A disadvantage of the known installation is the impossibility of detecting surface defects, which reduces the reliability of the control.

The aim of the invention is to increase the reliability of the control:. ,

The goal is achieved by the fact that the two converters are made in IH-current and are installed coaxially, the third converter is made electrically-acoustic and the matrix is centered along the control axis relative to the nerves, the adjustment mechanism and the remapping are made in the form of a floating frame. ca, the signal processing unit is made

in the form of three channels, a summatr and a multichannel recorder, each of the two channels consists of a series-connected amplifier and a delay unit and connected to the corresponding eddy-current transducer, the third channel consists of a series-connected amplifier and inverter and connected to an electro-acoustic-acoustic converter, all outputs channels are connected to the adder connected to. multi-channel recorder and defect meter

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The drawing shows a block diagram of the installation. .

Automatic installation with rollers system 1 with spring-loaded brackets, two eddy current transducers 2 and 3, electromagnetically-acoustic (EMA) transducer 4, adjustment and changeover mechanism made in the form of a floating frame 5, the signal processing unit of the transducers is made in the form of three channels, adder 6 and a multichannel recorder 7. Each channel of the eddy current transducer is composed of amplifier 8 and block 9 of the delay, the outputs of which are connected to the succator b, channel

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processing of the electromagnetic acoustic transducer is made in the form of serially connected amplifier 10 and inverter 11. A gap sensor 12 and a defect detector 13 are placed on the frame, through a signaling device 14 connected to an adder 6.

The installation works in the following way.

When a controlled object moves at a speed V relative to the frame of the automatic installation of integrated non-destructive testing of products, several options for the placement of defects are possible:

a) in the form of hairs, stones, etc., on the upper plane of the product under test;

b) the same on the lower plane;

c) on the top and bottom flat; t x controlled product;

d) in addition to the surface defects, there are also internal defects in the product.

On the upper plane there are defects in the form of hairs, holes, etc. The eddy current transducer 2 causes a signal to be present at the amplifier 8, which is delayed at the output of the amplifier by the delay unit 9 for the time required to move the defective part of the object to the EMA converter control area and then served on the first channel sa. the recorder 7, as well as in parallel to the first input of the adder 6. Since the signal from the converter 4 does not receive a defect, the block of the delay line and the peak detector (not shown) outputs the signal as a constant component to the second input of the five-channel recorder 7 and in parallel, the same signal is fed to the second input of the adder 6. Since the ultrasonic EMA transducer operates according to the mirror-shade method, the weakening of the bottom signal is a sign of the defectiveness of the product, this attenuation, all other conditions being equal udet depend on surface defects on both the top and bottom P9verhnost x.

A defect on the surface nearest to the transducer will lead to a weakening of the eddy currents on the surface, as well as to diffraction of the ultrasonic wave on the defect, as on a rough surface when the echo pulse returns to the originally emitted surface. The defect on the lower surface will lead to diffraction of the incident ultrasonic wave and, as a result, again to the attenuation of the reflected back ultrasonic wave. Thus, if there are defects on the surface of the product, the reflected bottom echo pulse weakens even in the absence of internal defects.

EMA-converter 4 through the amplifier 10 outputs a signal to the third input of the recorder 7 and through the inverter 11 to the input of the adder 6. The differential signal received at the output of the adder to the fourth input of the recorder 7 and parallel to it to the input of the automatic signaling device 14 defects, which is adjusted to a certain difference level signal. An automatic defect detector controls the operation of the flaw detector 13.

Transducers 2 and 3 generate signals for surface defects on amplifier 8, which are delayed by delay blocks 9 for the time required to move the defective rail section to the control area of the EMA converter, and then fed to channels I and II of the recorder 7, as well as by them I and II inputs of the adder 6. EMA-converter 4 through the amplifier 10 outputs a signal to the third input of the recorder 7 and through the inverter 11 to the third input of the adder 6. Moreover, the signal from the EMA-converter carries summary information about the presence of both internal and drug alarms defects. The difference signal obtained at the output of the adder from the bag of signals of surface defects and the total information from the EMA converter is fed to the fourth channel of the recorder 7. At the same time, the same signal controls the operation of the automatic signaling device 14 defects.

The use of the plant will allow automating the inspection of rolled products for internal and external defects.

Claims (1)

1. Shevchenko I.Ya. and others. The practice of mastering ultrasonic testing: welded joints of gas pipes of a large disimeter at Khartsyzsk Tube Works, viil All-6th scientific and technical conference on non-destructive physical methods and means of control. Chisinau, 1977, Part I, p. 264 (prototype).