The Research And Design Of High-precision Diameter Measurement System

In manufacturing process of tubular workpiece, because of the restrict of processingtechnology, tubular workpiece has certain shape and size errors, in order to ensure that theinner diameter of the tubular workpiece size accord with the actual application requirements,and according to the characteristics of workpiece to be measured, such as long pipeline, thecomplex internal environment, the characteristics of high accuracy, this paper studies anddesigns the smart-pig as the carrier, the inner diameter of the laser displacement sensor formeasuring system.Based on the principle of laser triangle, this paper puts forward a kind of detectionmethods used for complex tubular workpiece. This paper discusses the composition and theoverall structure of the system, the principle of detection method, the system has carried onthe theoretical analysis, and establishes the corresponding mathematical model. In this article,through analyzing the error of the measurement system, in order to ensure the reliability ofmeasurement system, the system has been optimized design, the key technology: thesmart-pig automatically set the mind as well as the adaptability of the design, the integrationof measurement and control system design, attitude correction system design and so on;This article in detail elaborated the system hardware composition, mainly including theselection of laser displacement sensor, data acquisition card, stepper motor selection, etc., andits performance indicators are analyzed in detail; The laser displacement sensor wasintroduced in detail, the data acquisition card equipment calibration process; And the paperuses the relevant data processing algorithm of data processing and analysis.Finally, through the actual verification, the design of measurement system of theindicators have reached the system design specifications and met the needs of the actualmeasurement。...