Variable rod length articulated arm type coordinate measuring machine

Abstract

The invention discloses a variable rod length articulated arm type coordinate measuring machine which comprises a base, three rotary joints, three swing joints, a base measuring arm, two measuring arms and a measuring head, wherein the two measuring arms are telescopic measuring arms with the same structure, and each telescopic measuring arm comprises a core shaft, a fixing screw, a sleeve and a guide key; for each telescopic measuring arm, the core shaft is mounted in the sleeve, the two are in clearance fit, a section of guide slot is arranged on the inner wall of the sleeve, the guide key is arranged on the core shaft, the relative circumferential fixation of the core shaft and the sleeve can be realized through the guide key, two thread holes are arranged on the sleeve, the fixing screw is screwed in the sleeve through the thread holes, a section of V-shaped slot is arranged on the core shaft, and the fixing screw is screwed for leading an circular arc-shaped head of the fixing screw to tightly push the V-shaped slot of the core shaft, thereby realizing the relative fixation of the sleeve and the core shaft. The variable rod length articulated arm type coordinate measuring machine can reduce the size of measurement space by regulating the rod length of the measuring arms, reduce the measurement error, improve the measurement resolution, achieve the best measurement efficiency, and still have higher repeated positioning precision after the length change of the telescopic measuring arms.

Description

technical field [0001] The invention relates to an articulated arm type coordinate measuring machine, in particular to a variable rod length articulated arm type coordinate measuring machine. Background technique [0002] The articulated arm coordinate measuring machine is a non-orthogonal coordinate measuring machine with multiple degrees of freedom (generally six or seven degrees of freedom). It imitates the structure of the human arm joints and connects a series of rods in series through joints. , has the characteristics of simple mechanical structure, small size, light weight, large measuring range, flexible and convenient, and can be measured on site or in the field. Since its invention in the 1980s, research institutions at home and abroad have carried out extensive research, launched related products, and quickly developed in mold design (including automobiles, motorcycles, plastic products, home appliances, handicrafts, toys and other related products) Mold reverse ...

AI Technical Summary

Problems solved by technology

[0003] The base of the measuring arm, the rotating joint, the swinging joint, and the measuring head of the current articulated arm coordinate measuring machine have relatively mature designs, which can be purchased directly from the market or processed by a special manufacturer, while the measurement used in the current measuring machine Most of the arms are hollow rods with a fixed length, which causes in the actual measurement process, when the measured workpiece is small, the measuring arm is too long, resulting in large measurement errors

And the measurement space required in actual work is often of different sizes, which results in poor work adaptability of measuring machines with long fixed rods

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