Two-dimensional precise anti-backlash adjusting mechanism of photoelectric autocollimator

Abstract

The invention discloses a two-dimensional precise anti-backlash adjusting mechanism for a photoelectric autocollimator. The two-dimensional precise anti-backlash adjusting mechanism comprises an upper-layer plate, a lower-layer plate, a rotating shaft, a top column, an orientation assembly, a pitching assembly and an anti-backlash assembly, two support pillars are fixed on the upper surface of the lower layer plate; the upper-layer plate is placed on the lower-layer plate and is supported on the support pillars; the rotating shaft is a stepped shaft, the small-diameter section of the rotating shaft is mounted in the lower-layer plate, and the large-diameter section of the rotating shaft is mounted in a mounting hole formed in the upper-layer plate; the rotating shaft is located between the two jacking columns. The orientation assembly, the pitching assembly and the gap eliminating assembly are all installed between the upper layer plate and the lower layer plate. The orientation assembly is used for driving the upper-layer plate to perform orientation rotation relative to the lower-layer plate by taking the rotating shaft as a rotating shaft; the pitching assembly is used for driving the upper-layer plate to conduct pitching rotation relative to the lower-layer plate with the upper end of the top column as a rotation supporting point. The gap eliminating assembly is used for eliminating gaps between parts in the adjusting mechanism. The device is simple in structure and reliable in adjustment, and can overcome the problem that the measurement data of the photoelectric auto-collimator is suddenly changed and moved out of the measurement range.

Description

technical field [0001] The invention belongs to the technical field of precision measurement, and in particular relates to a two-dimensional precise anti-backlash adjustment mechanism of a photoelectric autocollimator. Background technique [0002] The photoelectric autocollimator adopts the principle of autocollimation angle measurement in geometric optics. The scattered light emitted by the light source is projected onto the reticle at the focal plane of the collimating optical system after passing through the condenser, and then exits in parallel after passing through the collimating optical system. The optical signal of the information is reflected back to the collimation optical system, deflected by the beam splitter, and focused and imaged on the CMOS image sensor. The centroid coordinates of the image points are extracted by means of image processing, and converted into angle information through geometric optics. [0003] Photoelectric autocollimator is a precision ...

AI Technical Summary

Problems solved by technology

During the adjustment process, due to the small angle range and high measurement accuracy, after a large-scale adjustment, it is necessary to use a precision adjustment base to fine-tune the photoelectric autocollimator within a small angle range. The existing adjustment base generally adopts a three-layer board method , the bottom layer is used as a fixed base, one of the other two layers is used for azimuth adjustment, and the other layer is used for pitch adjustment. The structure is relatively complicated

The existing adjustment base generally uses the screw top column as the adjustment top column, and the azimuth adjustment is to adjust the photoelectric autocollimator connecting plate through the way of the left and right screw top columns facing each other, and the operator needs to adjust the left and right screw top columns respectively. Rotation operation, jumping and empty travel will occur during the operation, resulting in sudden changes in the measurement data of the photoelectric autocollimator, or even moving out of the measurement range. For pitch adjustment, the method of jacking up the screw top column is adopted, and the knob protrudes from the base. , which brings inconvenience to the installation and operation of the photoelectric autocollimator

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