Method for detecting assembly angle of runner blade through three-dimensional measuring arm

Abstract

The invention a method for detecting assembly inlet / outlet angle of a runner blade through a professional space coordinate measuring tool, this is, a three-dimensional measuring arm. The three-dimensional measuring arm is used for measuring a series of coordinate values of corresponding height position inlet / outlet cross sections of a runner in dimension inspection standard after blade assembly, and comparison calculation is carried out on actually-measured coordinate values and theoretic coordinate data to obtain the inlet / outlet angle value of blade assembly, thereby adjusting the assembly position of the runner blade and improving assembly precision. The method for detecting assembly inlet / outlet angle of the runner blade can replace a cumbersome sample frame and a sample tool; for the runners in different sizes and structures, one three-dimensional measuring arm can replace all sample frames and sample tools, and the cost can be saved in the runner manufacturing process; and the method can avoid artificial subjective factors, obtains more objective and reliable results, and is high in measuring efficiency and measuring precision.

Description

technical field [0001] The invention relates to a method for checking the assembly angle of runner blades by using a three-coordinate measuring arm. Background technique [0002] The turbine runner is the key component of the hydroelectric generating set, and its function can be compared to the heart of the human body. The manufacturing level of the runner represents the comprehensive development level and ability of the unit. In order to improve the hydraulic efficiency, the structural size tolerance and hydraulic profile tolerance of the runner adopt high standard requirements. In addition to the high precision of single-piece machining, the assembly accuracy of the runner is also very high. The assembly angle of the runner blade directly affects to the hydraulic efficiency of the runner. The traditional inspection method for the inlet and outlet angle dimensions of the blade assembly is: prepare a set of special template tools and a heavy tool positioning frame for a sin...

AI Technical Summary

Problems solved by technology

[0004] 1) The size and model of the runners are different, and the template tools required are also different, so all the template tools are special tools, and the supporting cost is high;

[0005] 2) For large and medium-sized runners, the size of the template tool and supporting tool positioning frame required is also relatively large, which makes the whole set of tools very cumbersome, and it is very difficult to carry when measuring the inlet and outlet angles of each blade of the runner. Low work efficiency;

[0006] 3) When using template tools to check the inlet and outlet angles of the blades, the processing accuracy of the template, the processing accuracy of the tool positioning frame, the positioning position of the tool positioning frame, and the human factors of the inspectors will all affect the inspection of the assembly accuracy of the blade inlet and outlet angles As a result, the influencing factors are complex and the inspection accuracy is poor

[0007] Based on the above traditional runner blade assembly size inspection method, many shortcomings have affected the company's runner assembly quality at this stage. In order to further improve the runner assembly manufacturing level, it is imminent to improve the runner blade assembly measurement method

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