RU1795261C - Linear dimensions meter - Google Patents

Abstract

The invention relates to measuring linear and angular displacements and is intended for use in reading systems of coordinate measuring machines and precision machines. The purpose of the invention is to improve the accuracy of measurements. The device comprises a housing 1. a measuring diffraction grating 2, an indicator grating 3, a measuring probe 4, guides 5. bearings 6 and 7, flat springs 8, a coil spring 9, thrust bearings 10 and 11 installed in recesses, a radiator and photodiodes, 3 ill.

Description

The invention relates to measuring equipment. And can be used in reading systems of measuring instruments, coordinate measuring machines, precision machines.

A device for measuring linear dimensions is known, comprising a housing, a measuring and indicator diffraction gratings installed therein with a constant-gap between them, a measuring probe with a tip in contact with the measured surface of the controlled product, rigidly connected to the measuring diffraction grating of so that the axis of the probe is aligned with the measuring surface of the grating. and made with the possibility of reciprocating movement in two x plain bearings. The indicator diffraction grating is rigidly fixed at the free end of the measuring diffraction grating and is stationary. To prevent the probe from turning around its axis, a fork is used that slides along the guide rail c. a gap between them for easy operation of the probe.

. A disadvantage of the known device is the lack of measurement accuracy due, firstly, to the cantilever mounting of the measuring diffraction grating, which causes the measuring grating to move relative to the indicator grating due to wear of the plain bearings and the result of this play. Secondly, the use of a plug in the device also reduces the accuracy of the measurements, since the gap between the probe and the plug causes a play, due to which the measuring diffraction grating will rotate around the axis of rotation of the probe.

Of the known devices, the closest in technical essence and the achieved positive effect to the proposed one is the photoelectric linear displacement transducer, selected as a prototype.

The disadvantage of the prototype is the lack of measurement accuracy due to the cantilever mounting of the measuring line.

The aim of the invention is to improve the accuracy of measurements.

This goal is achieved in that in a device for measuring linear dimensions, comprising a housing, bearing bearings coaxially mounted therein, sequentially mounted in bearings with

with the possibility of axial movement of the probe and the measuring ruler, which are in contact with each other by means of a swivel joint, an indicator ruler mounted on the housing optically connected to the measuring ruler, and a radiation source and receiver mounted on the housing on opposite sides of the rulers, the measuring ruler is made in in the form of a slider with guide surfaces installed in bearing bearings, which are made in the form of guide rulers, one of which is fixed rigidly, and the other under is rusted in its direction, and the indicator line is located so that its working surface with a diffraction grating coincides with the axis of symmetry of the bearing bearings.

0 In FIG. 1, a general view of the device is shown; in FIG. 2 shows a longitudinal section of the device; in FIG. 3 shows a cross section of the device.

Linear measuring device

5 sizes includes a housing 1, bearing bearings 2 coaxially mounted therein, successively mounted in bearings 2 with axial movement, the measuring probe 3 and the measuring ruler 4, contacting each other via a swivel joint. The swivel connection can be made of a solid flat sub-bearing 5, the support plane of which is perpendicular p5 on the axis of the probe 3, and a solid spherical sub-bearing 6. The landing surfaces of the sub-bearings 5 and 6 are made in the form of spherical segments and are rigidly fixed to form a contact along ok0 the meshes in the conical holes 7 and 8, respectively made on the end surfaces of the measuring line 4 and the measuring probe 3. The measuring probe 4 is spring-loaded to the measuring line 5 in the axial direction.

An indicator ruler 9 is mounted on the housing 1, which is optically coupled to the measuring ruler 4. On the housing 1, opposite to each other, the source 10 and the radiation receiver 11 are fixed on opposite sides of the rulers 4 and 9.

Measuring ruler 4 is made in the form of a slider with guides

by means of bearings installed in bearings 12 and 13, which are made in the form of guiding rulers, one of which is fixed rigidly and the other is spring-loaded in its direction, for example, by flat springs 14.

The indicator line 9 is positioned so that its working surface with a diffraction grating coincides with the axis of symmetry of the bearings 2.

Claims (1)

The claims A device for measuring linear dimensions, comprising a housing, bearing bearings coaxially mounted in it, sequentially mounted in the bearings with axial movement, the measuring probe and measuring ruler, contacting each other through a hinge connection, an indicator ruler mounted on the housing, optically connected to the measuring ruler, and mounted on the case on opposite sides from the rulers opposite each other, the radiation source and receiver, characterized in that, in order to increase the accuracy of measurements, the measuring ruler is made in the form of a slider with guide surfaces, installed in bearing bearings, which are made in the form of guide rulers, which are fixed rigidly, the other is spring-loaded in its direction, and the indicator bar is positioned so that its working surface with a diffraction grating coincides with the axis of symmetry of the bearing bearings. Aa