SU575472A1 - Device for contactless inspection of profiles of rotating articles - Google Patents

Description

the output of the amplifier and the second input of the trig repa and the standby multivibrator, including the NUM between the trigger output and the coincidence circuit.

Figure 1 shows the block diagram of the proposed device; in fig. 2 block diagram of the measuring organ.

The contactless monitoring device of the rotating parts profile (Fig. 1) contains an eddy current transducer 1 connected to the measuring body 2. The transducer 1 and the measuring body S are located in the housing 3 connected to the micro feeder 4. The output of the measuring body 2 is connected to the first inlet of the coincidence circuit 5 and with the amplifier 6, the output of the amplifier 6 is connected to the inputs of the first pulse generator 7 and the amplitude discriminator 8. The output of the latter through the second pulse generator 9 and the second detector 10 is connected to the second trigger input 11, the first input of which is connected to the output of the first driver 7. The output of the trigger 11 is connected to the second input of the matching circuit 5 via the waiting multivibrator 12, the output of which is connected to the C1-1 recorder through the first detector 13 ra 14. Another synchronization input of the recorder 14 is connected to the synchronization converter 15. The motor 16 serves to rotate the converter 1.

The measuring unit 2 (FIG. 2) comprises a high frequency generator 17 connected to an amplifier 1-8 of high frequency. The output of the latter through the detector 19 is connected to the output stage 20. Converter 1 is included in the circuit of the amplifier 18, its winding can also serve as the inductance of the oscillating circuit of the resonant amplifier.

Converter 1 is designed to convert the distance to the measured product to a change in resistance. It can be performed, for example, in the form of an inductance coil wound on a toroidal core. This core may have an uneven air gap, increasing in the direction from the outer circumference of the toroid to the inner one.

When inspecting a product, the transducer 1 and the product rotate around their axes. In this case, the converter is brought to the product by moving the body 3 in the direction of the USH rotation of the product and the converter using mechanism 4. Such reciprocal movements of the product and converter ensure the rotation of the axis of rotation of the 8) azovatel along the equidistant model profile.

As the transducer 1 rotates, the distance to the surface of the product changes, resulting in modulation of the transducer resistance. So .. as the oscillator 18 continuously receives the constant voltage frequency and constant amplitude from the oscillator 18, modulating the resistance of the converter 1 causes amplitude modulation of the output voltage of the amplifier 18. After this voltage is extracted using the detector 19 and amplified by the output voltage cascade 20, the signal is fed to the inputs of the coincidence circuit 5 and amplifier 6. The amplified and amplified-normalized signal from the output of the amplifier is fed to the inputs of the driver 7 pulses and amplitude discriminator 8. The latter generates high-frequency oscillations at those times when the derivative of the signal at its input is equal to or close to zero.

High-frequency signals from the output of the amplitude discriminator 8 are fed to the input of the second shaper 9 pulses, from the output of which the signals normalized in amplitude go to the detector 10. The DC pulses from the output of the detector 10 are fed to the trigger input 11 and translate it to another state in which he runs a standby multivibrator 1

In order to prevent the trigger 11 from being randomly polled, at time points between the extreme values of the signal, the trigger 7 is set to its initial state by means of the former 7.

The pulses of constant duration from the output of the waiting multivibrator 12 sink to the second input of the circuit 5, coincide and open it. In this case, the voltage arriving at the first input of the coincidence circuit 5 from the measuring body 2 is fed to the detector 13. At the output of the latter, a constant voltage appears that is proportional to the amplitude of the pulses at the output of the coincidence circuit 5, which is connected to the signal input of the recorder 14.

The Converter 15 is installed coaxially with the product. The synchronization signals of the converter 15 synchronize the movement of the chart paper of the recorder 14 with the rotation of the product, eliminating the time error of measurement.

Thus, for one revolution of converter 1, one measured distance is recorded (profile deviation) obtained along the normal to the profile. When bypassing the closed sectional profile of the controlled product on the diagram

Claims (2)

the paper draws a curve of deviations of the profile of the controlled product from the nominal profile. To control the next section of the product, the body 3 is shifted along the product axis by a certain distance, and this profile is measured in the same sequence. The invention provides a device for contactless monitoring of a rotating product profile, comprising an eddy current transducer, a micro-feed mechanism for a transducer, a measuring element from a generator, a signal amplifier, a detector and an output stage connected in series and connected to the converter, and a recorder with a synchronization converter different from that that, in order to increase the accuracy of control of products of complex shape, it provides i7 Pu2.i } - 20 are serially connected by a coincidence circuit and the first detector connected between the measuring body and the recorder, the amplifier, the first pulse shaper and the trigger, between the first input of which and the measuring body are connected the serially connected amplifier and the first driver of the 1 pulses connected in series by the amplitude discriminator, the second pulse generator On the second detector, on between the output of the amplifier and the second input f of the trigger, and the waiting multivibrator, turn on -, nym between the output and the flip-flop circuit matcher. Sources of information taken into account in the examination: 1. USSR author's certificate number 181309, cl. G01 a.5 / 20, 1966. 2. Author's testimony; Soviet USSR Nb 219790, class, G 01 B-7/28, 1967. sh f "2.2