SU741035A1 - Wire diameter measuring device - Google Patents

Description

The invention relates to a measurement technique and can be used to automatically control the wire diameter in various technological processes. A device for measuring the diameter of a wire, comprising a capacitive transducer formed by two flat electrodes and a controlled wire, is connected in series with a generator and an indicator 1. The drawback of the device is significant measurement errors. The closest in technical essence and the achieved result to the invention is a device for measuring the wire diameter, which contains a transformer bridge with a bone transducer and a current comparator 2. The disadvantage of it is the error in moving the wire in the device. The aim of the invention is to improve the measurement accuracy. The goal is achieved by the fact that the device is equipped with a second current generator, included in the shoulder of a capacitive converter, and the capacitive converter is made in the form of four electrodes located on the sides of the rectangle; one pair of input windings of the second comparator is connected to the output side of the secondary winding of the transformer, with ends the two opposite electrodes of the capacitive transducer, the other pair of input windings, are connected to the other two electrodes by the ends, and the ends to the first winding of the first coil currents, and the output windings of the comparators are turned on. The drawing shows a diagram of the described device. The device comprises a generator 1, a transformer bridge 2 formed by a voltage transformer 3, a comparator 4 currents, a capacitive converter 5, 1 by an indicator b. In addition, a comparator 7 currents with input OMOTKS1MI 8-11 and output winding 12 is included in the shoulder of the capacitive converter 5, the windings 8 are connected according to winding 9, the winding 10 corresponds to winding 11 and is opposite to windings 8 and 9.

The output winding 12 is turned on with the output winding of the comparator 4

If the wire is located in the center of the converter 5, and the electrodes are the same and symmetrically arranged, then the partial capacitances of the converter 5 Cj-Q are equal to each other, and the currents in the windings 8-11 are equal.

The current in the output winding 12 of the comparator 7 is zero. Then the current of the indicator 6 is determined by the current of the output winding of the comparator 4.

When moving the wire from the center, the partial capacitance changes. The current increment in winding 12 is defined by the expression:

& J uJ, + dJg - (uJj AJ).

With a small displacement from the center, there is a change in the partial capacities C-C) so that

| -DTs (| -dS2 | DSE LS.

The total capacitance of the converter 5 does not change, does not change and the current in the output winding of the comparator 4. With large displacements of the measured wire relative to its axis, the total capacity of the converter 5 decreases, which causes a change in the current in the output winding of the comparator 4. This change is offset by the opposite a change in the current of the winding 12, and the resulting current in the output winding of the comparator 4 depends only on the diameter value of the measured wire. Proposed

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The device has approximately 5 times less error from the movement of the wire in the converter.

Claims (2)

Invention Formula A device for measuring the diameter of the wire, containing a transformer bridge with an eMKOCTHfcJM converter and a current comparator, is characterized in that, in order to improve the measurement accuracy, it is equipped with a second current comparator included in the capacitance converter shoulder, and the capacitive converter is made in the form of four electrodes, located on the sides of the rectangle, one pair of input windings of the second comparator is connected to the output of the secondary winding of the transformer, the ends to two opposite electrodes of a capacitive converter, the other pair of input windings are connected to the other two electrodes, and the ends to the input winding of the first current comparator, and the output windings of the comparators are turned on. Sources of information taken into account in the examination .4 1. USSR author's certificate  274362, cl. G 01 B 7/08, 1970. 2. USSR author's certificate number 346569, cl. G 01 B 7/08, 1970 (prototype).