JPS59171805A - Measuring device for amount of eccentricity - Google Patents

Abstract

PURPOSE:To measure only the amount of eccentricity of a body obtained in its rotation irrespective of the length of the diameter thereof, by delivering a difference voltage between a peak hold voltage and a bottom hold voltage, as an eccentricity amount voltage. CONSTITUTION:A displacement meter 2 of a high-frequency oscillation type delivers a voltage D proportional to a gap (d) between a body 6 to be measured and a detecting probe 1, and holds the maximum value X thereof in a peak hold circuit 3. Meanwhile, the minimum value Y of the voltage D is held in a bottom hold circuit 4. A differential amplifier 5 delivers a voltage Z obtained by subtracting the voltage Y from X. The voltage Z is a difference voltage between the voltage X obtained when the body to be measured is farthest away from the detecting probe and the voltage Y obtained when said body is nearest to said probe. The difference voltage is proportional to a distance at which the body to be measured moves actually, thus representing the amount of eccentricity of the body to be measured.

Description

Detailed Description of the Invention The present invention uses a high frequency oscillation type magnetic displacement side and a high frequency oscillation type capacitance displacement meter to measure the eccentricity of a rotating object (object to be measured), etc., and converts it into an electrical signal. It relates to a device for converting.

Conventionally, in the process of manufacturing cylindrical or cylindrical parts, dimensions such as the diameter and inner diameter of the parts have been measured to determine whether the parts are good or bad.

In recent years, there has been a demand for determining the quality of these parts by measuring the balance of the entire part by measuring the amount of eccentricity at the time the part is rotated, rather than dimensions (tolerances) such as diameter and inner diameter. The present invention was devised for the purpose of determining only the amount of eccentricity ilH+1 when rotating an object, regardless of the diameter of the object (object to be measured). Moreover, the use of this method has the advantage of being able to cancel out errors of the displacement meter itself caused by temperature changes and the like.

Hereinafter, the present invention will be explained in detail based on examples together with the drawings.

FIG. 1 is a simplified configuration diagram showing an embodiment of the present invention, and FIG. 2 is a waveform diagram of a main part of the embodiment device.

1 is a detection glove, and 2 is a high frequency oscillation type displacement meter. Here, a voltage proportional to the distance (gap) dlc between the object to be measured 6 and the detection probe 1 is outputted.

3 is a peak hold circuit that holds the maximum voltage X of the voltages mentioned above. Further, the 4R bottom hold circuit similarly has the function of holding the minimum voltage Y of the voltage. It is a 511 differential amplifier and outputs voltage 2 obtained by subtracting Y from voltage X.

FIG. 8 is a diagram showing the principle of measurement, where 7 is an object to be measured and 8 is a detection probe.

The voltage 2 is the difference between voltage X when the object to be measured is farthest from the detection probe and voltage Y when it is closest (z=x-
y), which is proportional to the actual distance @VC of the object to be measured 65, and is nothing but the amount of eccentricity of the object to be measured.

If the amount of eccentricity is measured using the method of the present invention, as is clear from the above-mentioned fAII fixed principle, accurate measurement can be made even if the detection probe is placed at any position with respect to the object to be measured. It also has the feature of significantly reducing errors caused by temperature drift of the printer itself. In this embodiment, the amount of eccentricity with respect to a rotating object has been explained, but it is clear that the present invention can also be applied to measurement of the amplitude of vibration of an object to be measured that undergoes reciprocating motion or vibration.

[Brief Description of the Drawings] Figure 1 is a simplified configuration diagram of an embodiment of the present invention. Figure 2 is a waveform diagram of the main parts of the embodiment device. Figure 3 is a diagram of the measurement principle. 1... Detection glove section 2... High frequency oscillation type displacement meter 3...Peak hold circuit 4...Bottom hold circuit

Claims (1)

[Claims] This device uses a high-frequency oscillation type displacement meter and has the function of simultaneously performing peak hold and bottom hold on its output voltage.It outputs the voltage that is the difference between the peak hold voltage and the bottom hold voltage, and calculates this as the amount of eccentricity. A device that outputs voltage.