Rotation positioning device

Abstract

The invention provides a rotation positioning device. The rotation positioning device comprises a rotation shaft, a rotation bearing and positioning frame and an adjustable positioning ball assembly, wherein a V-shaped groove is formed in the surface of the rotation shaft, three positioning ball assembly installation planes are arranged on the surface of the rotation bearing and positioning frame and symmetrically arranged in the rotation direction of the rotation shaft, the adjustable positioning ball assembly comprises three eccentric positioning balls and three adjustment bolts, the three adjustment bolts are arranged on the three positioning ball assembly installation planes respectively, the eccentric poisoning balls are of a semi-spherical structure and connected to the three adjustment bolts respectively, one of the eccentric positioning balls makes point contact with the two planes of the V-shaped groove, and the other two eccentric positioning balls make point contact with the cylindrical surface of the rotation shaft. The rotation movement is restrained and delivered when the adjustable eccentric positioning balls make four-point contact with the rotation shaft, the rotation positioning device has relative movement freedom degrees in three directions, the requirement for rapid and repeated assembly and positioning can be met, the rotation positioning device adapts to the deviation caused by changes of the environment, and no additional disturbance torque is generated.

Description

technical field [0001] The invention relates to the technical field of precision instruments, in particular to a rotary positioning device. Background technique [0002] Couplings are widely used in mechanical transmission. It can transmit the motion and power of one shaft to another shaft, and is an important motion coupling part. [0003] In engineering, in addition to universal couplings that allow angular transmission, the existing couplings mainly include rigid couplings and elastic couplings. Among them, rigid couplings include fixed rigid couplings and movable rigid couplings. The fixed rigid coupling requires strict alignment of the axes of rotation of the two shafts to be connected, otherwise it will generate additional assembly stress that is difficult to determine, and cannot adapt to the coaxiality drift caused by changes in the ambient temperature and working temperature of the transmission system. It is rarely used in transmission. The types of movable rigi...

AI Technical Summary

Problems solved by technology

Because the measured torque is very small, the torque sensor used for detection has high precision and small measuring range, and the coaxiality error and deflection torque have a great influence on the measurement result, and even damage the sensor, so the existing couplings cannot meet this precision requirement.

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