SU945633A1 - Device for touch-free measuring of metal article displacement - Google Patents

Description

one

The invention relates to the instrumentation engineering and can be used to measure the movement of metal products, as well as to measure the thickness of dielectric coatings on non-ferromagnetic materials.

A device for contactless measurement of the movements of metal products is known, comprising a sinusoidal current generator connected in series, an overhead transformer eddy current transducer, a switch with a clock pulse generator, an amplifier, memory blocks, and a division unit flj connected to it.

A disadvantage of the known device is the possibility of using it 20 either only with two-way access to the controlled material.

The closest to the invention to the technical essence is

A device for contactless measurement of the movements of metal products, containing a series-connected sinusoidal current generator, a laid-on trance (| yurmator electromagnetic converter consisting of exciting and measuring windings, a switch and an amplifier, and a clock pulse generator, the output of which is connected; to the switch, three units memory, the first adder, the inputs of which are connected to the outputs of the second and third memory blocks, the second adder and the division unit, the inputs of which are connected to the output m storage units and the first adder, and the output is intended for connection to the indicator 2.

However, the device does not provide sufficient accuracy.

The purpose of the invention is to improve the measurement accuracy.

Claims (2)

The goal is achieved in that the device is equipped with an amplitude detector connected in series and a second switch connected between the amplifier and memory units, two squaring units connected between the inputs of the first and second adders and connected in series with the third squaring unit and a large-scale amplifier embedded in between the output of the second adder and the input of the division unit, the control input of the second switch is connected to the clock generator, and the converter, the receiver It is made with two additional measuring windings, independently connected to the first switch. The drawing shows a block diagram of the device. The device contains a sinusoidal current generator 1 connected in series, an overhead eddy current transducer 2 consisting of the excitation winding 3, the main measuring winding and the additional measuring windings 5 and 6, the switch 7, the amplifier 8, the amplitude detector 3 and the second switch 10. The operation of the switches 7 and 10 controls the clock pulse generator 11. Three memory blocks 12-14 are connected to the output of the switch 10. The outputs of the first and second blocks 12 and 13 of the memory are connected to an adder 15 and two blocks 16 and 17 of the action squared, to the outputs of which are connected sequentially connected second adder 18, block 19 of squaring, scale amplifier 20 and block 21 dividing, output which is intended to be connected to an indicator (not shown. In addition, the inputs of dividing unit 21 are connected to the outputs of memory blocks 12-14 and to the adder 15. The device operates as follows .. The exciting winding 3 is powered by sinusoidal current generator 1. The EMF coils are fed to the switch 7. Measurements are taken in three cycles. In the first clock, the generator .11 clock pulses switches switches 7 and 10 so that windings 4 and 5 are turned on and counter voltage is supplied through amplifier 8, the detector 9 and the switch 10 to the memory unit 12. In the second cycle, windings 4 and 6 are counter-turned on, and the signal from them is stored in memory block 13. In the third cycle, windings 5 and 6 are counted on and off, and the signal is remembered in the block 14 g amy. Then, the output signals from the memory blocks 13 and 14 are fed to the adder 15 and the square blocks 16 and 17. Next, the signals are summed in adder 18, the resultant is squared in the squaring unit E, scaled by the scale amplifier 20 and fed to the division unit 21. At the same time, in the PSx dividing unit 21: the signals from the memory blocks 12-14 and the adder 15 are blunt. A signal proportional to the measured movement of the product is extracted at the output of the block 21. The invention makes it possible to significantly improve the accuracy of measurements of the movement of products under the conditions of the influence of various interfering factors and wide ranges of their change. Apparatus of the Invention A device for contactless measurement of the movements of metal products, comprising a sinusoidal current generator connected in series, an invoice transformer electromagnetic converter consisting of exciting and measuring windings, a switch and an amplifier, and a clock pulse generator, the output of which is connected to a switch, three memory blocks ti, the first adder, the inputs of which are connected to the outputs of the second and third memory blocks, the second adder and the division block, which inputs connected to the taps of the memory blocks and the first adder, and the output is intended to connect the indicator, which, in order to improve the measurement accuracy, the device is connected in series an amplitude detector and a second switch connected between the amplifier and memory units, two squaring units connected between the first and second inputs to the maters and connected in series by a third squaring unit and a large-scale amplifier connected between the second output and second adder block dividing input, the control input of the second switch is connected to the clock pulse generator and the converter vlolnen with two measuring windings, additional independently connected to the first commutator torus. Sources of information taken into account in the examination 1. USSR author's certificate number f 6206b Cl. 601 B 7/0 1975. 2. Bykhovsky Yu. S., Kshnin N.A., Tomnikov G.N. Improvement of the characteristics of vibration and displacement amplitude meters by introducing an exemplary movement into the measurement channel. Automatic measuring and control devices. Scientific works of universities Volga, v1n. 6, Kuibyshev, 1971, p. 53-57 (prototype).