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

A technology of degree 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 reduce power and Dimensions, high-precision machining capabilities, and effects of reducing mass and inertia

Active Publication Date: 2017-01-18
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

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] Such as figure 1 As shown, the present invention includes a moving platform 1 that is an equilateral triangle, a static platform 2 that is an equilateral triangle and three branch chains 3 connecting the moving platform 1 and the static platform 2.

[0019] Such as figure 1 , figure 2 As shown, each branch chain 3 includes a connecting rod 4, and one end of the connecting rod 4 is connected to a corner of the moving platform 1 through a hinge 5 with two rotational degrees of freedom, and a straight line is arranged inside each connecting rod 4 As for the guide rails 6 , a slide block 7 is slidably arranged on each linear guide rail 6 . A driving device for driving the slider 7 to move on the linear guide rail 6 is also fastened to each branch chain 3 . Each slider 7 is connected to one corner of the static platform 2 through a hinge 8 with...

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Abstract

The invention relates to a parallel mechanism with two rotation degrees of freedom and one translation degree of freedom of space. The parallel mechanism comprises a movable platform in the shape of an equilateral triangle, a static platform in the shape of an equilateral triangle and three branch chains connecting the movable platform and the static platform. Each branch chain comprises a connecting rod, one end of each connecting rod is connected with one corner of the movable platform through a first hinge with two rotation degrees of freedom, and the inner side of each connecting rod is provided with a linear guide rail. A sliding block is arranged on each linear guide rail in a sliding mode, a driving device for driving the corresponding sliding block to move on the corresponding linear guide rail is firmly fixed to and connected to each branch chain, and each sliding block is connected with one corner of the static platform through a second hinge with two rotation degrees of freedom.

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): B23Q1/48
CPCB23Q1/4852
Inventor 王立平许华旸关立文支豫
Owner TSINGHUA UNIV
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