SU1670382A1 - Device for dimension control of parts - Google Patents

Abstract

The invention relates to a measurement technique and can be used for active and final quality control of parts in mechanical engineering. The purpose of the invention is to improve the measurement accuracy by ensuring maximum image sharpness over the entire range without changing the optical system. A collimated beam of light, formed by a light source and a collimating lens, illuminates a controlled part, its shadow image is projected by a focusing lens on a matrix phototransducer through a system of N sections in the form of dihedral reflectors, with corners and vertices chosen in such a way that the beam beams have the same path from the focusing lens to matrix photoconverter for each of the N sections. The device makes it possible to increase the measurement accuracy due to the lack of readjustment of the optical circuit. 1 il.

Description

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The invention relates to a measurement technique and can be used for contactless measurements of the outer diameters of products in mechanical engineering, in particular, in flexible manufacturing systems.

The purpose of the invention is to improve the measurement accuracy by ensuring maximum image sharpness over the entire range without changing the optical system.

The drawing shows a block diagram of the device.

The device consists of sequentially installed and optically coupled source of light 1, a collimating lens 2 and a focusing lens 3, between which a measuring part 4 is installed, a system 5 of flat mirrors, an array phototransducer 6 electrically connected with series-connected electronic unit 7, block 8 size and indicator 9. In this case, the system of 5 flat mirrors is made of N separate sections, the number N of which is determined from the equation

- &

where D is the measurement range;

g - half the length of the matrix of the photovoltaic converter;

ft is the magnification of the optical system.

A system of flat mirrors is installed between the focusing lens and the phototransducer and is made of N sections, each of which consists of a dihedral reflector; the vertices and angles between the faces are chosen in such a way that the optical path

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with

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The rays from the focusing lens to the matrix photoconverter are the same for each of the N sections, the sections are rigidly interconnected in width, and the total width of all sections is equal to the width of the photoconverter matrix.

The device works as follows.

The collimated beam of light formed by the light source 1 and the lens 2 illuminates the test piece 4. Its shadow image is projected into the focusing lens 3, which focuses this image into the matrix of the phototransducer 6 so that the top edge of the test piece 4 is always projected only one half along the length of the matrix surface of the photoconverter is 6, and the lower edge is on the other half.

In the case when the size of the examined part is d 2f, the light beams that have passed along the edges of the monitored part 4 are reflected from the mirror strips of the first section 10 of the mirror system and are projected into the right zone along the width of the matrix phototransducer 6.

When the size of the detail being examined, the light beams corresponding to the shadow images are reflected from the mirror strips of the second section 11 and are projected into the second zone across the width of the matrix converter, and in the case where these beams are reflected from the mirror strips of the third section and are projected into the third zone across the width of the matrix converter, etc.

The resulting shadow image using a matrix photovoltage transducer b and an electronic unit 7 transforms the pulse sequence, the amplitude and position of which correspond to the level of illumination of discrete photoelectric cells in the corresponding zones along the length and width of the phototransformer matrix 6.

In block 8 for determining the size, the pulses corresponding to the edges of the shadow image are identified and the size being monitored is determined from the expression

d (Lp + + 2r / 3i

where Lp and Li are the distance between the edge of the shadow image and the center along the length of the matrix of the photoconverter 6, respectively, on the right and left sides of it;

d) - correction factor, taking into account the optical zoom;

i is the coefficient corresponding to the zone across the width of the converter matrix into which the shadow image falls (if

in the first zone, then I 0, if in the second, then i 1, if in the third, then i 2, etc.).

The device allows to increase the measurement accuracy due to the absence of reconfiguration of the permanently installed optical

Claims (1)

system path, thus providing the ability to automate the process of determining the controlled size. Claims An apparatus for controlling the size of parts, comprising a sequentially installed light source, collimating and focusing lenses, a phototransducer, and an electronic unit connected in series with it, a determination unit dimensions and indicator, as well as a system of flat mirrors, characterized in that, in order to improve measurement accuracy, a system of flat mirrors is installed between a focusing lens and a phototransducer and is made of N sections, each of which consists of dihedral reflectors, with vertices and an angle between selected in such a way that the path of the optical rays from the focusing lens to the photoconverter for each of the N sections was the same, the section was rigidly connected to each other in width, the total width of all sections was equal to the width of the matrix The transducers are s, and N is the number of measurement subranges. Editor S.Nikitin Compiled by N.Serebrennikova Tehred M.MorgentalKorrektor M.Kucher va