Combined platform for gravity center measurement and correction for paddle of controllable-pitch propeller

Abstract

The invention relates to a combined platform for gravity center measurement and correction for a paddle of a controllable-pitch propeller. The combined platform comprises a base, a lifting mechanism I, a weighing sensor, a measuring workbench, a fixture assembly, a paddle supporting assembly, a paddle space attitude measuring device and a polishing device, and is characterized in that the fixture assembly is used for fixing the position of a paddle base plate and comprises a V-shaped frame and a pressure head; the paddle supporting assembly is used for supporting the paddle and comprises a lifting mechanism II and a paddle contact ball head; the paddle space attitude measuring device comprises laser displacement sensor measuring device capable of moving a three-dimensional manner and an inclination angle measuring device; the inclination angle measuring device comprises a positioning shaft and an inclination angle sensor, and the positioning shaft can be matched with a base plate hole in the paddle base plate; and the polishing device comprises a six-degree-of-freedom manipulator and a polishing head. The combined platform not only can perform gravity center measurement and correction on the paddle and is high in measurement and correction accuracy and convenient to disassemble. In addition, the combined platform can also be applicable to paddles with various different sizes, thereby being high in universality. Furthermore, the combined platform can also perform gravity center measurement on any placement space attitudes of the paddle.

Description

technical field [0001] The invention relates to the technical field of measuring and processing devices for controllable pitch propellers, in particular to a composite platform for measuring and correcting the center of gravity of controllable pitch propeller blades. Background technique [0002] Center of gravity measurement is required for pitch control propeller blades, and center of gravity correction is required for blades whose center of gravity measurement does not meet the requirements. However, in the prior art, there are many defects in the measurement and correction of the center of gravity of the blade of the controllable pitch propeller, and the specific analysis is as follows. [0003] 1. Center of gravity measurement [0004] Most of the traditional measurement platforms are single-layer structures. The conventional measurement method is: three ordinary sensors are fixed on the base at three points, the blades are directly in contact with the sensors, and the...

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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

The existing grinding methods mainly include manual grinding and grinding by special blade grinding machines. Manual grinding costs are high and the precision is low; when grinding with special blade grinding machines, the blades need to be transferred from the measuring table, and then the To measure the center of gravity, the entire measurement-grinding cycle is long, the efficiency is low, the position of multiple clamping changes greatly, and the measurement error is large

[0017] The current center of gravity measurement and correction device for pitch control propellers is two separate devices, that is, it can only measure the center of gravity of the blade, and cannot perform grinding correction; or it can only perform grinding correction but not the center of gravity measurement

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