SU1265584A1 - Device for monitoring stresses - Google Patents

Abstract

The invention relates to methods of non-destructive testing and can be used to determine the stress-strain state of elements of metal structures. The aim of the invention is to increase the reliability of monitoring by measuring at different depths from the surface of the monitored material. When the device is in operation, the signal from the measuring winding 16 is converted into a digital code, processed and changes the transmission coefficient of the attenuator 4, which allows control at different depths of the product. At the same time, the signal is filtered and displayed on the display of the indicator 8. Since the frequency of the generator 11 of the filling pulses can vary depending on the control, - sg of the voltage of the h control block 9 (L generator, it becomes possible to measure mechanical stresses at different depths, 1, etc. ND О5 sla 00

Description

The invention relates to methods of destructive testing and can be used to determine the direct-deformed state of the elements of metal structures. five

The aim of the invention is to increase the reliability of the control by measuring at different depths from the surface of the material being monitored, 10

The drawing shows a block diagram of a device for controlling mechanical stresses.

The device contains a clock pulse pulse generator connected in series, a divider 2, a band-pass filter 3, an attenuator 4, a phase damper, a throttle 5, horizontal and vertical amplifiers 6 and 7, and an electron-beam indicator. The device also contains a block connected in series 9 oscillator frequency control, 10 pulse filling generator, divider 11, pulse generator 12, K-clock 25 register 13, K amplifiers 14.1-14, K power. K-windings 15,1-15, K excitation of the converter, measuring winding 16 of the converter, amplifier 17, detector 18, filter 19, analog-30 digital converter 20, the clock input of which is connected to the output of the generator 12 pulses K-static registers 21.1-21 , K, the control inputs of which are connected to the corresponding outputs of the K-clock register, the switch 22, the control input of which is connected to the generator of 1 clock pulses and the digital-analog converter 23, the output of which is connected to the attenuator 4,.

The device also contains an arithmetic unit 24 connected in series, whose information inputs are connected to K-static 45 registers, and a clock input connected to the overflow output of the K-cycle register, and an indicator 25.

The device works as follows 50

The generator frequency control unit 9 generates a voltage, depending on which the pulse frequency of the generator 10 of the filling pulses changes. The pulses 55 produced by the generator 10 of the pulses are divided by the second divider 11 N times. Where and is an arbitrary number. The pulses from the output of the divider 11 are fed to the input of the generator 12 pulses and start it, From the output of the generator 12, the pulses are fed to the input of the K-clock register 13, From the outputs of the register 13, the pulses are fed to the inputs of power amplifiers 14, the other inputs of power amplifiers 14 continuously receive pulses generated by the generator 10 of the pulses, when they coincide at the input of the power amplifiers 14, the pulses from the output of the generator 10 are amplified and are fed to the corresponding excitation winding 15 of the converter installed on the surface of the product (not shown). The magnetic flux created by each of the K-windings 15 of the excitation is closed by a section of the product located between the respective excitation pole and the central pole of the magnetic transducer, resulting in an EMF in the measuring winding 16, amplified by the amplifier 17, since the value of the emf induced in the measuring winding 16 is proportional to the acting mechanical voltage, the output voltage at the output of the amplifier 17 is proportional to the desired mechanical voltage at the product site along the line connecting the operating winding 15 the excitation and measuring winding 16. Since the apparatus provides automatic sequential switching excitation winding 15, the output signal of the amplifier 17, repeats the shape of the floor diagram stresses acting in a control zone of the article.

Claims (2)

After detecting the signals from the output of amplifier 17 by detector 18 and filtering by filter 19, the signal arrives at the input of the analog-digital converter 20, to the control input of which comes a start signal from the output of the generator 12 pulses. Analog-to-digital converter 20 generates a code corresponding to the magnitude of the signal at the input. This code goes to the informative inputs of static registers 21, to the inputs. Records from which periodically signals come from the outputs of the K-clock register 13 If they coincide, the code is written to the corresponding static register 21, The code from the static register 21 enters simultaneously to the informative inputs of the arithmetic unit 24 and the inputs of the switch 22. The control input of the block 24 receives impulses from the Overflow of the K-clock p Giustra 13 which it periodically run. Block 24 performs the necessary operations with the codes arriving at its input, and feeds the information to the digital indicator 25. At the same time, pulses with a constant frequency f from the clock generator 21 are received at the control input of the switch 22. In accordance with the clock pulses, the switch passes codes that store in the static registers the input of a digital-to-analog converter 23, which converts the code present at its input into proportional voltage, which in turn goes to the input of the attenuator control 4. Pulses The generator 21 of the same pulses is also fed to the input of the second divider 2, where it is divided into K / 2 a number of times and then fed to the input of the band-pass filter 3. Thanks to the band-pass filter 3, the signal is given to the input of the attenuator 4 2f where K / 2 is the division factor of the second divider 2. The attenuator 4 attenuator ratio 4 is controlled by the control input by the output voltage of the digital-to-analog converter 23. Therefore, a sinusoidal voltage, amplitude modulated with depth proportional to, arrives at the phase splitter 5 input. mechanical stresses acting in the control zone magnetized at the corresponding time points. Using the phase splitter 5, the input signal is divided into two channels, with the phase difference you The output signals of this unit are TG / 2. After amplifying the horizontal and vertical deflection in amplifiers 6 and 7, these signals are displayed on the screen of the electron-beam indicator 8. Since the frequency of the generator 11 of the pulse pulses may vary depending on the control voltage of the generator 9, it is possible to measure mechanical stresses at different depths, which allows you to build up from mechanical stresses acting in the surface layer due to work hardening, and thereby increase the accuracy and reliability of measurements Nij. The frequency of the clock pulse generator 21 is selected from the condition of ensuring that the screen of the electron-beam indicator 8 does not flicker, which reduces operator fatigue and the likelihood. Mechanical stress control device containing a pulse generator, sequentially connected, first divider, band-pass filter, attenuator and a phase splitter, vertical and horizontal deflection amplifiers connected to a phase splitter, and an electron beam indicator connected to amplifiers horizontal and vertical deviations, and K-clock register connected in series, K power amplifiers, V. + 1 is a pole converter, the excitation windings are on the K peripheral poles, and the central windings are. Measuring winding and amplifier, characterized in that, in order to increase the reliability of the control, it is equipped with a series-connected detector, the input of which is connected to the amplifier, filter, analog-digital converter, the control input of which is combined with the input of the K-clock register and connected to the generator impulses, To static registers, the control inputs of which are connected to the corresponding outputs of the K-clock register, a switch and a digital-to-analog converter, the output of which is connected to the tnuat a clock generator, the output of which is connected to the ommutator and the input of the first divider, successively connected by the generator frequency control unit, the generator of filling pulses, the second output of which is connected to the clock moves to the power amplifiers, and the second divider which output is connected to the control input of the generator 1 pulses, and consistently connect $ 126358/14 With the help of the arithmetic unit, the instructors, and the control unit, the input is connected to the input inputs of which the sub-input output of the replenishment K is clocked to the outputs of the K-static register and indicator.