Protection device and method for controllable-pitch propeller blade root bolt

Abstract

The invention relates to a protection device and method for a controllable-pitch propeller blade root bolt. An annular space formed between the head of a blade root bolt and a mounting hole of a bladeflange is filled with a blade root bolt protective agent for guaranteeing the external line type of a blade, external foreign matters can be prevented from entering the annular space area, and a protective layer is formed outside the blade root bolt. The annular space formed by the blade root bolt and the blade flange mounting hole is filled with the blade root bolt protective agent, the externalline type of the blade is guaranteed, external foreign matters are prevented from entering the area, and the protective layer is formed outside the blade root bolt. The protective layer has good insulativity and corrosion resistance, and can effectively reduce the risks of chemical corrosion, electrochemical corrosion and hydrogen embrittlement fracture of the blade root bolt to a certain extent.And meanwhile, while isolating a circular truncated cone at the head of the blade root bolt from seawater, the protection device can be dismounted in a manual knocking mode, and repeated disassemblyand assembly of the blade root bolt are facilitated.

Description

technical field [0001] The invention relates to a ship's controllable pitch propeller device, in particular to a controllable pitch propeller blade root bolt in the ship's controllable pitch propeller device. Background technique [0002] The blade root bolt is one of the important parts of the controllable pitch propeller device. It is used to connect the blade and the crank plate of the hub. It needs to ensure long-term reliable operation under complex underwater loads. Therefore, the necessary protective measures for the blade root bolts are very important. The blade root bolts are located in the mounting holes of the blade flange. During installation, after tightening the individual blade root bolts one by one and taking anti-loosening measures, the current commonly used method is to fill the annular space formed by the blade root bolts and the blade flange mounting holes. Quick-drying cement or epoxy resin to keep the outer line of the blade smooth, improve the hydrody...

AI Technical Summary

Problems solved by technology

However, using quick-drying cement to cover the blade root bolts cannot avoid the contact between the head of the blade root bolts and the seawater, and the quick-drying cement is easy to fall off. The blade root bolts are exposed to the marine environment for a long time, and there are chemical corrosion, electrochemical corrosion and hydrogen corrosion. The risk of brittle fracture; and the use of epoxy resin to coat the blade root bolts can prevent the head of the blade root bolts from contacting with seawater, further reducing the risk of chemical corrosion, electrochemical corrosion and hydrogen embrittlement of the bolts, but the epoxy resin Strong adhesion, once filled, it is difficult to remove. When the ship docks again to check the blade sealing ring and remove the blade root bolts, the epoxy resin inside the pit cannot be removed, which will affect the normal removal of the blade root bolts

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