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A parallel mechanism with two rotational and one translational degrees of freedom in space

A technology with degrees of freedom and translation, applied in the direction of manufacturing tools, metal processing machinery parts, large fixed members, etc., can solve the problems of limiting the range of rotation angle of the end moving platform, uncertain mechanism accuracy, limited rotation angle, etc., to achieve high force Effects of balanced characteristics, high-precision processing capability, and high rotation angle range

Active Publication Date: 2017-02-01
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above mechanism uses a spherical joint with a limited rotation angle and difficult to guarantee accuracy as the kinematic pair, which not only limits the range of rotation angle of the end moving platform, but also may have an uncertain impact on the accuracy of the mechanism

Method used

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  • A parallel mechanism with two rotational and one translational degrees of freedom in space
  • A parallel mechanism with two rotational and one translational degrees of freedom in space

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0017] Such as figure 1 As shown, the present invention includes a moving platform 1 , three fixed frames 2 evenly arranged around the moving platform 1 and distributed axially symmetrically, and three branch chains 3 connecting the moving platform 1 and the fixed frames 2 .

[0018] Such as figure 1 , figure 2 As shown, each branch chain 3 includes a linear guide rail 4 fastened to the inner side of the fixed frame 2, the linear guide rail 4 is arranged along a direction perpendicular to the moving platform 1, and a slider 5 is slidably arranged on the linear guide rail 4 A driving device for driving the slider 5 to move on the linear guide rail 4 is also fastened on the fixed frame 2 . Each branch chain 3 also includes a connecting rod 6, one end of the connecting rod 6 is connected with the slider 5 through a first hinge 7 with two rotational d...

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Abstract

The invention relates to a parallel mechanism with spatial two rotation and one translation freedom degrees, wherein the parallel mechanism with spatial two rotation and one translation freedom degrees comprises a movable platform, three fixing frames which are uniformly axially and symmetrically distributed around the movable platform, and three branched chains for connecting the fixing frames with the movable platform; each branched chain comprises a linear guide rail which is fixedly connected on the inner sides of the fixing frames and perpendicular to the movable platform, a slide block which is slidably arranged on the linear guide rail, a drive device which is fixedly connected on the fixing frames and used for driving the slide block to move, and a connecting rod, wherein one end of the connecting rod is connected with the slide block via a first hinge which has two rotation freedom degrees, the other end is connected with the movable platform via a second hinge which has two rotation freedom degrees. The parallel mechanism with spatial two rotation and one translation freedom degrees can be widely applied to five-shaft linkage parallel serial numerically-controlled machine tools.

Description

technical field [0001] The invention relates to a parallel mechanism with two degrees of freedom in space, two rotations and one translation, which is applied to a hybrid numerical control machine tool, and belongs to the field of mechanical manufacturing. Background technique [0002] The parallel mechanism has the advantages of compact structure, good modular performance, high stiffness-to-mass ratio, and easy realization of high-speed motion, but the working space of the parallel mechanism is limited, and it is usually necessary to use a spherical joint whose machining accuracy is difficult to guarantee as its necessary kinematic pair. This restricts its development in the field of mechanical manufacturing to a certain extent. In recent years, some hybrid manufacturing equipment based on parallel mechanisms with few degrees of freedom have been successfully applied in industry, such as the five-axis hybrid machining center based on the Tricept mechanism, and the Ecospeed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q1/44
CPCB23Q1/44
Inventor 王立平许华旸关立文支豫
Owner TSINGHUA UNIV
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