SU1233042A1 - Arrangement for inspecting article quality - Google Patents

Abstract

The invention relates to non-destructive testing of materials and products and can be used to control the quality of products in the form of a cylinder, an axial bushing sleeve and a straight polygonal prism made of ceramic and metal materials. The aim of the invention is to increase the reliability of control by introducing a correction of the reference frequency, which takes into account, besides the geometric dimensions, the presence of chipped edges of the test item. To check the presence of chipping on the side surface of the product, in order to obtain a reference frequency correction signal, roll the monitored product along an inclined chute. The acoustic noise arising at this moment is converted into an electrical signal by a transducer, then amplified to the required level by an amplifier, formed in amplitude and duration by a pulse shaper, and fed to a pulse counter, where it is recorded. Next, the pulses are converted to analog voltage, proportional to the size and number of chips, by a digital-to-analog converter. The correction signal is applied to the first input of the analog adder, the output of which is connected to the third input of the analog switch from the output of the slip converter - voltage. An analog voltage proportional (relative to the selected base) to the size of the end of the moving sound guide when fixing the monitored product is fed to the second input of the analog adder and then the sum of the voltages () is fed through an analog switch to a parametrically variable element in the variable frequency oscillator driving circuit. At the same time, at the output of the oscillating frequency generator, the value of the corrected reference frequency is established, which corresponds to the dimensions of the product under test, taking into account the chipped edges and the physico-mechanical characteristics of the reference product. 1 il. y cl GcheE 00 with O 4 to

Description

The invention relates to non-distressing control of materials and products with the help of excitation and registration of ultrasonic resonant vibrations (URC) and can be used S different industrial areas for mass quality control of products in the form of a cylinder. bushings with an axial bore and straight multifaceted prisms made of ceramic and metal materials,

The aim of the invention is to improve the accuracy and reliability of the control floor due to the possibility of z-automatic ™

correcting the shift of the resonance, 15, with a pifro-analog converter 21. A correction signal is fed to the first input of the analog adder 22 ;. the output of which is connected to the third input of the analog frequency connection.

Pa drawing shows the block diagram of the device for quality control

ISGS LY.

The device contains a follower-20 tator 12. but the connected 1 oscillating oscillator-after, frequency-controlled inclined chute, acoustically coupled transmitting and receiving transducers 2: l 3 and block 4 amplitude detector amplitude detector 5, strobe-impulse driver 6, driver 7 time interval, electronic key 8, counter 9 pulses, block 10 -dccation ,. RS-flip-flop 1 1 and analog co-t 5utator 12, the output of which is connected to the input of the oscillating frequency generator 1, the generator 13 of modulating voltage, the outputs of which are connected to the second inputs of the short-circuit trigger 11 and the analog switch 125 in series connected displacement sensor 14 and transducer 15 displacement voltage, reference frequency generator 16, output connected to a second input of an electronic switch 8, second receiving transducer 17 connected in series, amplifier 18 J shaper 19 kmpool s second counter 20 of them Pulse, digital to analog converter 21 and angiyugovy adder 22, the second input of which is connected to the output of the converter 15 is moving - voltage and an output - to the third input, the analog switch 12, the second input unit 1C kn gikaidi connected to the output of the generator 1 swept frequency. Positions 23 and 24 designate a test item — and a sloped chute.

Devices for product quality control works as follows.

The control is carried out in two stages. First things started to check the presence of chips on the side of the surface of the product

receiving the correction signal of the reference frequency, the monitored product 23 rolls along the inclined chute 24. The acoustic noise arising at the time of rolling is converted into an electrical signal by the converter 17, then amplified to the required level by the amplifier 18, is formed in amplitude and duration by the IS pulse shaper With the pulse generator 19 pulses The counter is detected by a pulse counter of 20 pulses and converted to analog voltage proportional to the size and number of

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The manufactured article -23 is fastened in a clamping device (not shown) for subsequent control, carried out as follows. Transmit- ting transducer 2, to which variable frequency is applied, is. The strand from the oscillating frequency generator 1, excites through core sound ducts (not shown) in the controlled product 23 mechanical, resonant oscillations. The latter are converted by the receiving transducer 3 into an electrical signal, which is fed to the input of an amplifier unit 4, in which the necessary signal amplification is carried out: aa- and suppression of signals caused by the responses of the sample under study to harmonics: the most alternating voltage of the oscillator 1 oscillating frequency. For this, the oscillating frequency generator 1 is adjusted so that the midband of the block 4 of the amplifiers coincides with the current value of the fundamental frequency of the oscillating frequency generator 1 and varies synchronously with it. After amplification, the signal is detected by an amplitude detector

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the voltage of the oscillating frequency generator 1, with the resonant frequency of the monitored product 23, the amplitude of oscillations after the current increases sharply, and an oscillating signal in the form of a resonant peak appears on the detector detector 5. The distance from the output of the amplitude detector 5 skla cal is fed to the fool detector 6

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strobe pulse, which produces a single empty pulse at the moment of time corresponding to the transition of the frequency-varying voltage of the oscillating frequency generator 1 through the maximum of the resonant peak of the controlled product 23. At the time of arrival of the strobe pulse, the time interval generator 7 generates a pulse whose length is proportional to the period oscillator 1 oscillating frequency This pulse Opens the electronic key 8, and pulses from the oscillator 16 of the reference frequency arrive at the pulse counter 9. Then the information contained in the pulse counter 9 enters the induction unit 10, in which the reference and resonant frequencies are indicated.

To form a reference frequency, a moving element of a displacement sensor 14 is kinematically connected to the moving end of one of the sound ducts, the output of which is connected to a displacement-voltage converter 15. From the output of the converter 15, the displacement - voltage analog voltage, proportional to (relative to the selected size base) the amount of movement of the end of the moving sound line when the monitored product 23 is fixed, is fed to the second input of the analog adder 22, and then the sum of voltages () is fed through the analog switch 12 is a parametrically variable element in the frequency setting circuit of oscillating frequency generator 1. In this case, the output of the oscillating frequency generator 1 sets the value of the corrected reference frequency corresponding to the dimensions of the monitored product 23, taking into account the chipped edges, if any, with the physico-mechanical characteristics of the reference product.

After the indication, the RS flip-flop 11 issues a command that switches the analog switch 12 to a position in which a sawtooth voltage is applied to the parametric change of its generator element 1 from the generator 13 of the modulating voltage,. Za330424

the search for the resonant frequency of the controlled product 23 in the selected frequency range.

Since the detected frequencies of the resonant oscillations of the monitored product 23 depend on one side on the geometrical dimensions and the presence of chipped edges of the monitored product 23, and the other on the presence of cracks in the last 10, the position of these frequencies on the frequency axis relative to the chrominated corrected reference frequency is used as a criterion for the effect of the monitored (5 product 23.

Claims (1)

Invention Formula Quality control device 20 products containing a series-connected oscillating frequency generator, acoustically coupled transmitting and receiving transducers, an amplifier unit, an amplitude detector, a strobe pulse shaper, a time interval shaper, an electronic key, a pulse counter, a display unit, an RS flip-flop and an analogue the switch, whose output is connected to the input of the oscillating frequency generator, the modulating voltage generator, the outputs of which are connected to the second inputs of the RS flip-flop and the analog input device, in series with union of displacement sensor and displacement transducer - voltage, a reference frequency oscillator output is connected to the second input of the electronic key of m and l -  In order to improve the accuracy and reliability of the control, it is equipped with series-connected receiving transducer, amplifier, pulse generator, second pulse counter, digital-analog converter and analog adder, the second input of which is connected to the output of a voltage-voltage transducer, and the output is to the third input of the analog switch, the second input of the display unit is connected to the output of the oscillating frequency generator. five 1 12: f: f eleven  i ft L ... 1 P tF 1 -..-. ™ 4   Ills l one 22 2 2 / 3 I ..... il L ..., Editor P ,, Qiq Compiled K "Leonov Tehred O Gortvay Order 2762/45 T Theft 778 VNSHPI, State Committee of the USSR on affairs of invention n oct) 113035s Moscow, F-ZZ, Raushska nae, „, d„ 4/5  Production and printing company, Uzhgorod, st. Project, 4 Corrector G, Reshetnik