Device and method for measuring center of gravity of paddle of controllable-pitch propeller

Abstract

The invention relates to a device and a method for measuring the center of gravity of a paddle of a controllable-pitch propeller. The device comprises a machine seat, a lifting mechanism, weighing sensors, a measuring table, a V-shaped aligning device, a paddle support component and a two-axis tilt angle sensor, wherein the V-shaped aligning device is fixedly arranged on the measuring table and is used for placing a paddle chassis; the paddle support component is used for supporting a paddle blade; the two-axis tilt angle sensor is placed on the flat surface of the upper surface of the paddle blade. The method comprises the steps of establishing a coordinate system of the measuring table, inputting the positions of three center of gravity measurement points, weighing under the condition of no load, leveling the paddle, weighing the paddle, calculating the position of the center of gravity of the paddle, and the like. A double-layer structure is adopted, and the three weighing sensors can contact the measuring table at the same time and are stressed at the same time, so that the weighing sensors are protected; the paddle is convenient to install; the paddle chassis is installed on the V-shaped aligning device, so that the device has an automatic alignment function and also can adapt to the measurement of centers of gravity of paddles with multiple different specifications. Furthermore, the device and the method can realize two-time measurement, and are convenient in measurement and small in calculation error.

Description

technical field [0001] The invention relates to the field of controllable pitch propeller measurement, in particular to a controllable pitch propeller blade center of gravity measurement device and measurement method. Background technique [0002] The traditional center of gravity measurement methods mainly include: suspension weight measurement method, compound pendulum weight measurement method, counterweight balance method and plane measurement method. Among them, the suspension measurement method is mainly used to measure the plane center of gravity of objects with uniform thickness. The compound pendulum measurement method is mainly used to measure the moment of inertia and gravitational acceleration of a rigid body in physics, and is suitable for rough measurement of the center of gravity of a small-volume rigid body. The counterweight balance measurement method is to adjust the installation position of the sensor and the mass of the counterweight to make the workpiec...

AI Technical Summary

Problems solved by technology

[0005] 1. The blades are irregular in shape, the adjustment cycle is long, and the leveling is difficult

[0006] 2. Since the sensor is directly in contact with the blade, the blade is easy to hit the load cell during the measurement process; the blade is shaped, and the support point of the tooling is prone to slipping and other factors that affect the measurement results, and the data changes during repeated measurements.

[0007] 3. It takes several hours to position, install, adjust, weigh and disassemble each blade, which is time-consuming

[0010] 1. The four hydraulic lifting mechanisms need to work at the same time, so the synchronization is difficult to guarantee. The measuring frame may be tilted during the process of rising and falling, and it cannot be guaranteed that the load cell can be stressed at the same time at the beginning, which may affect a certain scale. The heavy sensor causes overload, which affects the service life of the load cell

[0011] 2. The paddle is installed on the measurement base through positioning and screws, which is troublesome to install

[0012] 3. The measurable blade type is single, and the scope of application is small

[0013] 4. After measuring the center of gravity of the propeller, the propeller and the measuring base need to be removed at the same time. After the propeller is placed, the measuring base is put back and fixed on the measuring frame. It is laborious and time-consuming to assemble and disassemble back and forth, and the work efficiency is low.

[0014] 5. The spherical contact between the top of the four hydraulic cylinders and the measuring frame, without a guide mechanism, cannot fully guarantee that the measuring frame will not slide during the lifting process

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