Rectilinear translation planar nine-bar mechanism and method for constructing a rectilinear translation motion mechanism

Abstract

The invention relates to a planar nine-bar mechanism for generating high-accuracy rectilinear translation and a method for constructing a rectilinear translation motion mechanism. The planar nine-bar mechanism for generating high-accuracy rectilinear translation is designed based on the principles of the Roberts mechanism and parallelogram pantograph (pantograph) and the basic structure consists of a Roberts mechanism and two parallelogram four-bar mechanisms. Based on the basic structure, the planar nine-bar mechanism for generating high-accuracy rectilinear translation can be assembled and modified into a plurality of transformations. The planar nine-bar mechanism for generating high-accuracy rectilinear translation has the advantages of few rods, high structural stiffness, compact structure, structural symmetry, etc. The planar nine-bar mechanism for generating high-accuracy rectilinear translation and the method for constructing the rectilinear translation motion mechanism can be widely applied to the occasions where the translation needs to be implemented, can substitute various small-stroke guide rails, simplify maintenance and also can be used as a rectilinear motion decelerator for increasing the driving force.

Description

technical field [0001] The invention relates to a linear moving device without a guide rail, in particular to a planar link mechanism capable of producing high-precision linear translation motion and a construction method thereof. The invention can be widely used in occasions where translation motion needs to be realized, can replace various small stroke guide rails, and can also be used as a linear motion reducer. Background technique [0002] A straight-line generating mechanism generally refers to a linkage mechanism that converts rotary motion into linear motion. In the first industrial revolution, the research of straight line generating mechanism occupies an important position. According to the accuracy of the generated straight line, it can be divided into approximate straight line generating mechanism and accurate straight line generating mechanism. Since the approximate straight line generating mechanism usually requires fewer rods, so Apply more. Classic four-bar...

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Problems solved by technology

However, the flexible belt used in this mechanism is long and has a large amount of deformation, so the structural rigidity is small

The US MIT patent "Apparatus having motion with pre-determined degrees of freedom" (US Patent No.: US6688183) combines four or eight sets of double parallelogram seven-bar mechanisms into an XY two-degree-of-freedom parallel platform, which has a symmetrical structure and a relatively small stroke. Great advantages, but a large number of elastic parts are used to connect the motion platform and the frame, and the structural rigidity is low

[0008] The fourth method is based on the Sarrus space six-bar mechanism, such as the patent "Straight Line Mechanism" (US Patent No.: US5237887) of Rockwell Corporation of the United States. The disadvantage of this mechanism is that it occupies a large space

However, the load capacity of small and medium-sized linear motors is relatively low, and its maximum speed is not necessary in some applications, so it is hoped that the high-speed linear motion can be converted into medium-high speed linear motion through the reduction mechanism

However, the reduction mechanism that can be used for medium and high-speed linear motion is still very rare at present. Although the common stroke multiplication scheme can achieve deceleration, such as the scheme using an extension mechanism, and the scheme using gears, cams or pulleys, it is difficult to maintain and difficult to use. For medium and high speed sports

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