Device and method for measuring the perimeter of cabin section based on non-contact profiling method

Abstract

The invention provides a cabin cross section circumference measuring device and method based on the non-contact profiling method, and belongs to the technical field of manufacturing and precision measurement. The cabin cross section circumference measuring device comprises a system of a part to be measured, a reference coordinate motor system, a follow-up rocker system and a data collecting, analyzing and processing system. The follow-up rocker system comprises a displacement sensor, a rocker arm, a ball screw, a sliding block, a follow-up servo motor and a counter weight. The data collecting, analyzing and processing system comprises a signal transformer, an analog-to-digital converter, a motion controller and a digital-to-analog converter. The motor drives a rocker arm system to rotate by a circle, the displacement sensor records the coordinate positions of all points to be measured by the adoption of the non-contact method, the shape of the part to be measured is profiled, and the circumference of the part to be measured is calculated. The cabin cross section circumference measuring device and method based on the non-contact profiling method can achieve higher measurement accuracy and cannot scratch the part to be measured at all.

Description

technical field [0001] The invention relates to the measurement of the circumference of large convex structures. The non-contact profiling method can be used to measure the circumference of workpieces with high precision without causing damage to the workpieces. It is especially suitable for the measurement of the circumference of structures such as large cabin sections. , Belongs to the field of manufacturing and precision measurement technology. Background technique [0002] With the development of industry, small cabin structures can no longer meet today's production requirements. In practical engineering applications, due to the complexity, uncertainty and manufacturing errors of its structure, it is difficult to measure the actual circumference of large convex structures such as cabins more accurately; for some more precise parts, in When measuring, it is necessary to avoid scratches on it, and these requirements are difficult to achieve for traditional contact measure...

AI Technical Summary

Problems solved by technology

The traditional method of measuring the circumference of a circle adopts the rope binding method, that is, a relatively inelastic rigid rope is wrapped around the circumference of the measured circle to make it tightly attached to the surface of the measured circle, and the length of the rope is approximately regarded as the circumference. The rope itself has elasticity, and it is difficult to ensure that the circle surrounded by the rope is on the same plane as the center of the circle to be measured during the operation. The existence of these problems leads to the accuracy of the measurement results can only reach the millimeter level, which cannot meet the requirements for high precision. The measurement requirements of the workpiece; another commonly used method is the contact measurement method, which is based on the gear meshing method and ignores the relative slip between the measuring wheel and the workpiece to be measured, that is, the measuring wheel rolls on the surface to be measured , the radius of the measuring small wheel is known, and the circumference of the workpiece to be measured can be obtained by calculating the number of turns of the small wheel. This measurement method uses a contact method, which will produce scratches on the surface of the workpiece to be measured, and cannot be used For the measurement of high-precision parts, it is impossible to achieve no relative sliding between the small measuring wheel and the workpiece, so measurement errors will occur

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