Grating ruler and ruler shell

Abstract

The invention discloses a grating ruler and a ruler shell. One end, far from a ruler shell opening in a vertical direction, of a ruler shell body is provided with an installation part for positioningwith mechanical equipment, the installation part is provided with an expansion and contraction adjustment part in the length direction of the ruler shell body, the expansion and contraction adjustmentpart is provided with an installation hole for fixing with the mechanical equipment, first expansion and contraction adjustment cavities are arranged between two ends of the expansion and contractionadjustment part in the length direction of the ruler shell body and the installation part, a second expansion and contraction adjustment cavity for buffering and adjusting expansion and contraction of the ruler shell body in the vertical direction is arranged between the bottom of the expansion and contraction adjustment part and the installation part, and two ends of the second expansion and contraction adjustment cavity penetrate the installation part. The ruler shell is fixed with the mechanical equipment through the installation hole; when the ruler shell bears vibration, assembly stressand thermal load, buffer deformation is realized through the expansion and contraction adjustment part, external stress strain and thermal load can be unloaded effectively, deformation difference of the grating ruler and the mounting surface support is reduced, and impact of temperature assembly stress on grating measurement accuracy is reduced.

Description

technical field [0001] The present invention relates to the technical field of optical precision instruments, more specifically, to a scale housing of a grating ruler, and to a grating scale including the scale housing. Background technique [0002] A grating ruler is a measurement feedback device that works by utilizing the optical principle of a grating. Because of its large detection range and high precision, it is often used in various precision CNC machine tools, electromechanical equipment, and automated measuring equipment. [0003] Enclosed scales have an aluminum housing to isolate the interior of the scale from environmental influences. The grating scale is bonded inside the scale shell, and is firmly connected with the external equipment bed through the scale shell. Due to the different materials of the grating ruler and the scale shell and the equipment bed, the thermal expansion coefficient is also different. When the external environment temperature changes, ...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the first object of the present invention is to provide a scale housing of a grating scale to solve the problem of the difference in deformation of the mounting surface of the grating scale and the scale housing when the existing grating scale is subjected to external stress, strain and thermal load. Affecting the measurement accuracy of the grating ruler and other issues

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