Limitation-free high-resolution double-speed hand wheel

Abstract

The invention belongs to the technical field of surveying and mapping instruments, and relates to a limitation-free high-resolution double-speed hand wheel which comprises a main shaft, a positioningplate, a reed, a driving wheel, a speed change piece, a transmission rod, a locking sleeve, a hand wheel outer shell and the like. The limitation-free high-resolution double-speed hand wheel is basedon a lever speed reduction principle, the main shaft is driven by the speed change piece and the transmission rod in a fine adjustment part to realize speed reduction, so that the angular displacementprecision of the main shaft of the fine adjustment part is greatly improved compared with that of a rough adjustment part when the hand wheel rotates by the same angular displacement, and a reductionratio can reach 4.3:1 in a limited range. The limitation-free high-resolution double-speed hand wheel mainly has the following beneficial technical effects that: the structure is simple, the universality of parts is high, the resolution ratio and the collimation error of the instrument are small, and the collimation difficulty is reduced.

Description

technical field [0001] The invention belongs to the technical field of surveying and mapping instruments, in particular to an infinite-position high-resolution double-speed handwheel. Background technique [0002] The measurement error of the surveying and mapping instrument is affected by many factors, among which the fine-tuning error (also known as the aiming error) is an important aspect. It is caused by the surveyor not accurately aiming at the target point when adjusting the instrument to aim at the target through naked eye observation. error. With the development of society, the precision requirements of surveying and mapping instruments are getting higher and higher, so it is of great significance to reduce the fine-tuning error. [0003] When adjusting the instrument through the handwheel, the minimum displacement that the human body can perceive is 0.1mm. Take the outer diameter of the handwheel 30mm as an example. At present, the minimum angular displacement of t...

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Problems solved by technology

[0003] When adjusting the instrument through the handwheel, the minimum displacement that the human body can perceive is 0.1mm. Take the outer diameter of the handwheel 30mm as an example. At present, the minimum angular displacement of the ordinary handwheel without dual-speed function is about 0.38°. The reduction ratio, the resolution of the instrument is about 5″; the resolution of the instrument is about 3.5″ for the two-speed handwheel driven by the thread at present, but this kind of handwheel has an adjustment travel limit and cannot be infinitely adjusted

[0004] In order to further improve the resolution of the instrument and realize infinite adjustment, the current handwheel can no longer meet the needs of use

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