Study of horizontal shafting with spherical four-way structure

Altazimuth photoelectric theodolite level shaft U-type and T-type structure, but with the expanding field of applications of photoelectric theodolite, the horizontal shaft structure occur great changes. For example, in the marine environment, shipboard conditions, the instrument has a waterproof, corrosion-resistant, easy maintenance and other functions, while carrier-based optoelectronic devices from a single visible television configure the development of integrated infrared system and ranging system as one of the single-station measurement system, due to the spherical structure has sufficient internal space exactly adapted to this need. In this paper, the horizontal axis of a spherical four-way structure. From aspects of the spherical four-way split in the form and shafting design and finite element analysis of the detailed design. A spherical four-way horizontal axis system, diameter 550mm, weight 19kg sphere, in the 40kg load, the maximum deformation of 3.3μm, fully meet the requirements. The shaft of the structure of the shaking is less than 2 arc seconds, the vibration test, the re-examination instrument accuracy change is less than 1 arc seconds. Verify that the structure is stable and reliable.