Six-degree-of-freedom adjusting device

Abstract

The invention provides a six-degree-of-freedom adjusting device. The six-degree-of-freedom adjusting device comprises at least three inclined blocks used for fixing and supporting a platform to be adjusted, and at least three adjusting units which abut against the inclined blocks separately, wherein each inclined block comprises two inclined surfaces, each adjusting unit comprises two eccentric wheels which abut against the two inclined surfaces separately, and the eccentric wheels rotate to drive the inclined blocks to move. According to the invention, micro displacement is generated through rotation of the eccentric wheels, and adjustment for the space state of the platform is realized, so that use for a high-precision electric cylinder is avoided, and the height of the whole device can be reduced. The six-degree-of-freedom adjusting device has the advantage of being simple in structure, and compared with an existing six-degree-of-freedom platform, the cost can be remarkably reduced. According to the invention, the eccentric wheels are small in whole stroke, and high-precision adjustment can be realized by combining a speed reducer and other mechanisms.

Description

technical field [0001] The invention relates to the field of adjustable positioning devices, in particular to a six-degree-of-freedom adjustment device. Background technique [0002] The six-degree-of-freedom platform (Stewart platform), also known as the parallel system, was first proposed by Stewart in 1965 and was first used in flight simulators to train pilots. In 1978, Hunt in Australia first proposed the use of the Stewart platform as the arm of the robot. It opens up a new direction for Stewart platform applications. [0003] The six-degree-of-freedom platform consists of an upper platform, a lower platform, 6 freely telescopic rods and 12 spherical joints (or universal joints), and the expansion and contraction of each rod can be freely controlled. Through the combined control of 6 rod lengths, it can translate in any direction in three-dimensional space, and can also rotate around any axis. It is also because of this structure that to make the platform move regula...

AI Technical Summary

Problems solved by technology

[0006] 1. As an adjustment and positioning platform, technicians hope that its structure will be flat and occupy less space. However, the existing six-degree-of-freedom platform is limited by the principle and is bulky and inconvenient to use.

[0007] 2. The cost is high. The control components of the six-degree-of-freedom platform include 6 electric cylinders and 12 Hooke hinges. Each electric cylinder includes a motor, reducer, screw, guide rail, etc., and each Hooke hinge includes at least 4 Precision bearings have a complex structure and it is difficult to reduce costs, especially the 6-degree-of-freedom platform with micron precision, the cost is even higher

[0008] 3. It is difficult to achieve micron-level or higher adjustment accuracy. The moving parts of the six-degree-of-freedom platform are 6 telescopic rods. To achieve micron-level adjustment, the telescopic rod must perform telescopic movement with micron-level precision. Due to factors such as space constraints, it is very difficult to achieve this

Images