Gravity center measurement instrument of propeller blade with variable screw pitch

Abstract

The invention discloses a gravity center measurement instrument of a propeller blade with a variable screw pitch, which comprises a base, three pressure sensors and a chuck. The three pressure sensors are mutually in 120degree along the same peripheral direction and are symmetrically installed among the bottom surface of the chunk and the top surface of the base; and the center of a circle formed by the three sensors is on the axis of the chuck; and one of the three sensors can move up and down through a lifting system. The gravity center measurement instrument can reduce the guide rails and the position detection equipment and ensure the measurement accuracy and is applicable to propeller blades in various shapes.

Description

technical field [0001] The invention relates to a center-of-gravity measuring instrument, in particular to an adjustable-pitch propeller blade center-of-gravity measuring instrument. Background technique [0002] At present, the only method that can accurately measure the center of gravity of the adjustable propeller blade (hereinafter referred to as the blade) is the three-point support method. Now some manufacturers have used this method to manufacture an instrument for accurately measuring the center of gravity of the blade. The theoretical model is as follows: figure 1 shown. [0003] Due to the irregular shape of the propeller blade and the large distortion of the blade surface, the three-point support method is used to measure the center of gravity. Among the three support points, component A is fixed in the horizontal plane and must move up and down in the vertical plane, while components B and C must move in both horizontal and vertical directions, and have a certai...

AI Technical Summary

Problems solved by technology

[0004] (1) Since the sensor needs to slide on the guide rails 1-5, it is equipped with corresponding position detection equipment and fixed equipment, which increases the error and increases the cost of the instrument;

[0005] (2) Three points are required to be supported on the blade surface during measurement. Due to the irregular shape of the blade and the large distortion of the blade surface, the blade may slip sideways, which will affect the accuracy of the measurement

[0006] (3) When the flange of the propeller is clamped on the chuck 1-7, a large bending moment will be generated at the root, and the rigidity of the bed 1-6 is required to be high, and the length of the bed is longer than the design radius R of the propeller Large, increasing the footprint of the entire device

[0007] (4) On the whole, the instrument has high technical difficulty and manufacturing precision requirements, and the structure is relatively complicated, and careful maintenance must be carried out, and the cost investment is high.

Images