Maintenance of propeller in marine power machinery
The propeller in ship power machinery is a kind of propeller commonly used on ships. It is a piece of equipment that promotes ship movement. By converting the power emitted by ship power machinery into propulsion, the ship's navigation is guaranteed. As an important part of the ship, the propeller mainly includes the blade and the hub. According to the form of the integration of the two, the propeller is divided into an integral type and a combined type. Integral type, the blade and hub are cast into one body, so it is an integral type. In the combined type, the blade and the hub are cast separately, and then the two are connected to each other by bolts to play an integral role. There is a certain difference in the pitch between the two types. According to different needs, the number of blades is also different, generally 3-6. The shape is more complicated, because its size and weight are relatively large, processing and manufacturing are also difficult. Among them, the blades need to be processed with a variety of tools, including grinding wheels, wind shovel, etc., mostly manual grooves, and the production efficiency is relatively low. After the ship's propeller blades are connected to the hub, they need to be connected to the tail shaft, which is the shaft during rotation, to ensure smooth operation. There are three main ways of this kind of connection. The first is a more traditional way, namely mechanical connection, that is, connecting the two with a transmission key. Although this method is easy to cause cracks or broken shafts, it is also a method that has been used today. The second is the epoxy resin adhesive connection, which uses a bonded epoxy resin adhesive to bond the connection. This method is mainly used in small and medium-sized ships. The last is the hydraulic keyless sleeve connection, that is, the inner surface of the cone hole of the hub is directly embedded on the propeller tail shaft. This method is more reliable and easier to disassemble.
