Three pairs of sliding pair-spherical hinge-spherical hinge (3-PSS) mechanism-based coordinate measuring machine

Abstract

The invention discloses a three pairs of sliding pair-spherical hinge-spherical hinge (3-PSS) mechanism-based coordinate measuring machine. The 3-PSS mechanism-based coordinate measuring machine is characterized in that: a three pairs of sliding pair-spherical hinge-spherical hinge parallel mechanism is provided; three motion sliding blocks are independently arranged on a pair of ball guide rails which are arranged in parallel and can slide freely along the ball guide rails respectively; the three motion sliding blocks are connected with one end of each of three pairs of link rods through one end of a universal joint respectively; the other end of each of three pairs of link rods are connected with a measuring moveable platform through the other end of the universal joint respectively; a measuring head is arranged on the lower plane of the measuring moveable platform; three indication gratings are fixedly connected to the three motion sliding blocks respectively; a scale grating and the pair of ball guide rails are arranged in parallel and are arranged on the guide rail mounting surfaces of guide rail cross beams; and the guide rail cross beams are suspended and fixedly connected to a pair of brackets. The 3-PSS mechanism-based coordinate measuring machine has high rigidity, a simple structure, high processing assembly property and low cost and can measure the three-dimensional space sizes, the shapes and the mutual positions of parts quickly and precisely.

Description

technical field [0001] The invention relates to a measuring machine used in mechanical precision manufacturing of automobiles, aviation, aerospace, ships, machine tools, etc., more specifically, a precision detection machine for three-dimensional dimensions and shapes of mechanical parts. Background technique [0002] Three-coordinate measuring machines have been widely used in the fields of high-precision measurement of the size, shape and mutual position of three-dimensional complex parts, as well as digitalization of physical models and online quality control. At present, the commonly used three-coordinate measuring machine mainly includes two types, namely, the Cartesian coordinate system coordinate measuring machine and the spherical coordinate system measuring machine, also known as the flexible joint arm three-coordinate measuring machine. In addition, the German ZEISS company also launched the only cylindrical coordinate measuring machine (also called parallel joint ...

AI Technical Summary

Problems solved by technology

The traditional Cartesian coordinate measuring machine has strong versatility, large measurement range, high precision, high efficiency, good performance, and can be connected with flexible manufacturing systems. The workpiece size must be smaller than the measuring space of the measuring machine, and the price is also very expensive

Although the flexible articulated arm three-coordinate measuring machine is a portable coordinate measuring system, which partially makes up for the deficiencies and defects of traditional measuring machines, its structure is essentially similar to that of a series robot with multiple articulated arms. Transmissive accumulative errors, in order to ensure the measurement accuracy, it is necessary to strictly control the rotation accuracy of the shaft system and select a high-precision angle encoder, which leads to difficult processing and high manufacturing costs. At the same time, the system rigidity is relatively poor after adopting a series structure. It is difficult to control the accuracy of the system, and it shows the non-uniformity of accuracy in the measurement space

[0003] Parallel mechanism has unique advantages such as good stiffness, light moment of inertia, and natural error averaging effect. It has been very maturely applied in parallel robots, parallel machine tools and MEMS actuators, but in the field of coordinate measurement, parallel mechanism has not been widely used. good application

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