SU527587A1 - Device for measuring geometric dimensions - Google Patents

Description

one

The invention relates to instrumentation engineering and can be used in the metallurgical, machine-building, instrument-making and other industries.

Devices are known for measuring the geometrical dimensions of articles made from electrically conductive materials, for example, with the aid of eddy current and capacitive sensors, which contain sensors and secondary equipment.

1, 2. For a relatively high error due to the influence of various factors, it is very difficult to achieve the required measurement accuracy in these devices. (Errors increase with increasing geometrical dimensions of controlled objects),

The closest in technical essence to the proposed invention is a device for measuring geometrical dimensions, which contains a generator, two gap sensors installed coaxially at a fixed distance from one another and connected to the generator output, an adder, whose inputs are connected to the outputs

The gap sensors, the comparison unit, connected to the output of the adder, and the recording unit 3, Both sensors have identical characteristics on the gap and are connected to the secondary equipment. In a known device, destabilizing factors and an increase in the size of the product sushgst. I1l: this reduces the accuracy of control.

The purpose of the invention is to improve the measurement accuracy, especially when measuring large-sized items.

This is achieved by the fact that the proposed device is equipped with a third sensor connected to the -e :: in the rator, having an ohranyatnaya characteristic of the gap and installed in such a way that its working surface lies in the od plane with the working surface of the second sensor, the second support device the inputs of which are connected to the signal inputs of the second and third sensors; and a generator control unit, the input of which is cue dinene with the output of the second totalizer; e B .-; move-with generator control input.

The drawing shows otrokturnak

The scheme of the proposed device for measuring geometric dimensions.

The device contains sensors 1,2,3 clearances, adders 4.5, generator 6, matching unit 7, registration unit 8 and generator control unit 9, consisting, for example, of a comparator unit and a generator output regulator.

The device works as follows. Signals taken from sensors 1 and 2 located on different sides of the material being measured and having the same clearance characteristics are fed to an adder 5, from which, through a comparison block 7, the total measured signal goes to a recording block 8. At the same time, signals taken from sensors 2 and 3, located on one side of the measured material and having opposite characteristics on the gap, are fed to the adder 4, from the output of which, through the generator control unit 9, the total control signal is fed to the input of the generator 6. of the monitored parameter, the signals of the sensors 2 and 3 change in opposite directions (one increases, the other decreases), and the summing control signal remains the same. If the thickness remains constant, but a moving effect appears (for example, the temperature or the mains supply voltage changes), the signals on both sensors change in one direction. In this case, the total control signal also changes and, through the control unit, influences the amplitude of the output voltage of the generator in such a way that the thickness indicator reading remains the same.

The use of the proposed device allows to significantly improve the accuracy of control of geometric dimensions.

Claims (3)

1. USSR author's certificate No. 365553, G 01 B 7/06, 1973 2. USSR Author's Certificate No. 195650, G 01 B 7/0, 1967 3. Dorofeev A, L “Induction thickness of number. Ed. Energie, M., 1969, p. 152. Ak "S4 / five N . N