Multi-degree-of-freedom motion branched chain resolution test platform and test method

Abstract

The invention discloses a multi-degree-of-freedom motion branched chain resolution test platform and test method, belongs to the technical field of machinery, and can directly measure the radial run-out error of a bearing in a motion branch chain and the resolution of the motion branch chain of a multi-degree-of-freedom motion platform. The platform comprises a laser displacement meter; a fixing device; a straight beam type flexible hinge connected with the fixing device; a movable platform fixedly connected with the straight beam type flexible hinge; and a linear driving assembly arranged between the fixing device and the movable platform. The upper end of the linear driving assembly is connected with the lower end face of the movable platform through the flexible spherical hinge, and thelower end of the linear driving assembly is connected with the fixing device through a hooke joint; the laser displacement meter is placed over the movable platform; the fixing device is provided with five fixing points which are symmetrically distributed; the straight beam type flexible hinge and the movable platform are integrally machined and formed, and the straight beam type flexible hinge and the fixing device are connected through a ball screw and a spring. The hooke joint is connected with the fixing device and the movable platform through screws.

Description

technical field [0001] The invention belongs to the technical field of machinery, and in particular relates to a multi-degree-of-freedom motion branch chain resolution test platform and a test method. Background technique [0002] The multi-degree-of-freedom motion branch chain is the main component of a variety of parallel motion mechanisms including the 6-degree-of-freedom motion platform. Nowadays, with the increasing application of multi-degree-of-freedom parallel motion mechanisms in the fields of vehicles, medical care, and aviation, it is important for motion The precision requirements of the platform are also getting higher and higher. Due to the relatively high displacement output accuracy of the current high-precision motor, the error of the multi-degree-of-freedom parallel kinematic mechanism mainly comes from the multi-degree-of-freedom shafting design of the Hooke hinge at the connection between the motion branch chain and the table top. However, due to the spe...

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Problems solved by technology

However, due to the special structural limitations of the Hookee hinge, the traditional shafting error measurement method is useless for the motion accuracy test of the Hookee hinge. Therefore, there is no domestic research on the motion accuracy of the multi-degree-of-freedom mechanism motion branch chain and its Hookee hinge. Relevant special research, considering that the accuracy of multi-degree-of-freedom kinematic mechanism mainly depends on the kinematic accuracy of each kinematic branch chain, so in the design and research process of multi-dof kinematic mechanism, it is necessary to conduct systematic research on its kinematic branch chain first

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