Outer diameter measuring instrument for big size shaft type parts

Abstract

An outer diameter measuring instrument for big size shaft type parts adopts the measurement principle of circumference three-point contact measuring method, and mainly includes a base, flare angle arms, a grating scale and a sleeve, wherein the two flare angle arms are in taper interference fit with the base; the sleeve is vertically arranged on the base; the grating scale is vertically arranged in the sleeve; a retractable and movable sensor contact terminal is arranged at the front end of the grating scale; the sensor contact terminal penetrates the center of the base and arranged between the two flare angle arms; a top block is arranged at the upper end of the grating scale; and a pressure pad and an end cover are arranged at the upper end of the sleeve. The working principle of the invention is that the indirect measurement method, namely the circumference three-point contact measuring method is adopted to measure the outer diameter of the cylinder; and the two flare angle arm structures forming a fixed angle can directly present the diameter variation of a tested workpiece through the displacement of the contact terminal of the grating scale, thereby guaranteeing the measuring accuracy, and solving the problem of error amplification caused by polar angle variation at the same time.

Description

technical field [0001] The invention relates to a measuring tool, in particular to an instrument for measuring the outer diameter of large-size shaft parts. Background technique [0002] Currently, it is relatively easy to routinely measure the outer diameter of small shaft workpieces, which can be measured with calipers or outer micrometers. However, its measurement accuracy and measurement method are insufficient in measuring the diameter of larger shafts. The current industry-recognized method is to use large calipers or micrometers, but the measurement method is time-consuming and difficult to meet the specified accuracy requirements. There are more than a dozen measurement methods that have been tried and studied at home and abroad, which are divided into mechanical measurement methods and photoelectric measurement methods. The specific methods are as follows. [0003] 1. Mechanical measurement method. ①Diameter measurement with vernier caliper: mainly used for measur...

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Problems solved by technology

[0007] In order to solve the problems of error amplification and error change caused by the opening angle change in the theodolite method, and the difficulty in measuring bow height and chord length in the bow height and chord length method, the invention provides a large-scale Shaft Parts Outer Diameter Measuring Instrument

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