Variable-arm-length articulated-type coordinate measuring machine

Abstract

The invention discloses a variable-arm-length articulated-type coordinate measuring machine, and the machine comprises a substrate, three swinging joints, two variable arm length measuring arms, and a measuring head. A main shaft is disposed in an inner sleeve, and is connected through a thread of one end. A sliding table is disposed in an outer sleeve, and is connected through a thread of the other end. A guide rail is fixed on the main shaft through a screw, and a sliding block is fixed on the sliding table through a screw. The main shaft is provided with a thread hole, and the sliding table is provided with a through hole. The arm length can be locked through a screw. A limiting mechanism is fixed on the sliding table and the main shaft, and locks the length change range of the variable arm length measuring arms. Aiming at the size of a measured object, the machine is enabled to achieve the optimal measuring efficiency through the adjustment of the length of the measuring arms. After the lengths of the variable arm length measuring arms change, the machine still can achieve a very high repeated positioning precision. The distances between thread holes of the sliding table are fixed. After the adjustment of the lengths of the variable arm length measuring arms, the machine does not need to be calibrated for measurement.

Description

technical field [0001] The invention relates to an articulated coordinate measuring machine, in particular to a variable-arm long articulated coordinate measuring machine, which belongs to the field of articulated coordinate measuring machines. Background technique [0002] Articulated coordinate measuring machine is a multi-degree-of-freedom non-orthogonal coordinate measuring machine. It imitates the joint structure of the human arm and connects a series of rods in series through joints. It has a large measurement range, convenience and flexibility, and high precision. , simple mechanical structure, good environmental adaptability and so on. Various research institutions at home and abroad have conducted in-depth research on articulated coordinate measuring machines and developed related products. The articulated coordinate measuring machines have been widely used in the fields of product quality online inspection, equipment maintenance, aircraft assembly, mold design, med...

AI Technical Summary

Problems solved by technology

[0003] Most of the measuring arms used in the current articulated coordinate measuring machines are of fixed length, which results in the fact that in the actual measurement process, when the workpiece to be measured is small or the measurement space is small, the measuring arm is too long and the measurement large error

Moreover, the measurement space required in actual work is often uncertain, which results in poor work adaptability of articulated coordinate measuring machines with fixed arm lengths

Patent 201010195897.X proposes to use guide groove and guide key to realize the purpose of measuring rod length change of joint type coordinate measuring machine, but this method needs to be calibrated after each rod length change, resulting in cumbersome working process

Patent 201020168446.2 proposes a reconfigurable articulated arm coordinate measuring machine, which achieves the purpose of changing the length of the measuring rod of the articulated coordinate measuring machine by removing or adding parts, but the operation of changing the length of the measuring rod each time is very cumbersome, resulting in work greatly increased volume

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