Screw pitch adjusting device used for controllable-pitch propeller model and using method of screw pitch adjusting device

Abstract

The invention discloses a screw pitch adjusting device used for a controllable-pitch propeller model and a using method of the screw pitch adjusting device. The device comprises a propeller assembly,a pitch adjusting assembly and a pushing rod assembly, wherein the propeller assembly comprises several crank discs, several paddles, a first propeller hub and a second propeller hub, and first pin holes are formed in the inner ends of the crank discs; the crank discs are respectively connected with the first propeller hub and the second propeller hub, and the paddles are respectively arranged atthe outer ends of the crank discs; the pitch adjusting assembly comprises an adjusting disc, a fixed scale disc, a first dummy boss and a second dummy boss, the lower end of the adjusting disc penetrates through the fixed scale disc and is connected to the circumferential walls of the first dummy boss and the second dummy boss, and a second pin hole is formed in the lower end of the adjusting disc; the pushing rod assembly comprises a first pushing rod and a second pushing rod, a first crank pin is arranged at one end of the first pushing rod, a second crank pin is arranged at the other end ofthe first pushing rod, and the lower surface of the first pushing rod abuts against the upper surface of the second pushing rod. The device improves accuracy of adjusting the screw pitch of the controllable-pitch propeller model and shortens adjusting time.

Description

technical field [0001] The invention relates to the technical field of pitch precision adjustment, in particular to a pitch adjustment device for a pitch control propeller model and a method for using the same. Background technique [0002] Propellers are currently the most widely used marine propellers. From the perspective of whether the pitch of the propellers is adjustable, they can be divided into fixed-pitch propellers (fixed-pitch propellers) and adjustable-pitch propellers (controllable-pitch propellers). Ships with operating functions generally drive the connecting rod slider mechanism through a hydraulic device, so as to realize the adjustment of the pitch during the operation of the propeller, so as to achieve the purpose of adapting to multiple working conditions. [0003] In the design stage of the controllable pitch propeller blade, the hydrodynamic performance at multiple pitch angles is usually tested by reducing the model, and the test object is required to ...

AI Technical Summary

Problems solved by technology

[0004] The production of the model is mainly divided into two categories: one is to process a propeller model for each pitch that needs to be tested. In order to reduce the error, only the test object needs to be replaced between two tests, which saves test time. The disadvantage is that the production quantity is large, the cycle is long, and the total cost is high, especially when there are many pitches corresponding to the detection of hydrodynamic performance; One is to make a propeller model with each blade independently adjustable. When it is necessary to adjust the pitch, loosen the fastening device for a certain blade, and judge the pitch adjustment by detecting the value data of the surface characteristic position of the blade. , and then tighten it after adjusting it in place to prevent the deflection of the blade under force during the hydrodynamic test. In this way, do the same operation on other blades. The advantage is that only one propeller model is processed, and the cost is low and the production cycle is short. Short, one of its disadvantages is the adjustment error caused by the pitch adjustment process. The size of the error depends on the operation of the pitch adjuster, which is generally larger than the overall processing error. The second disadvantage is that the process of adjusting the pitch is time-consuming. Many, in the process of continuous model testing, it is necessary to wait for the pitch of the test object to be adjusted before starting the follow-up work

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