In recent years, with the continuous progress of agricultural mechanization, more and higher demands have been put forward for the transmission and transportation chains. No matter the grain crop and cash crop harvest machine to complete a specific function, its selection of roller chain is particularly important.
The outer chain plate and pin shaft, the inner chain plate and sleeve are connected respectively through interference fit. The gap between the sleeve and the pin and between the sleeve and the roller is matched. When the sprocket teeth engage with the chain, the friction between the rollers and the teeth is basically rolling friction. Sliding friction between sleeve and roller, pin and sleeve. The roller chain link plate is usually formed in a figure of eight, making each part close in strength and reducing inertia and weight during exercise.
Compared with belt transmission, roller chain transmission has compact structure, small load on the shaft, large carrying capacity, high efficiency and accurate average transmission ratio. One of the main failure modes of the transmission chain is chain wear. The wear process of the chain in the transmission process, the relative movement of the contact part between the pin and sleeve, roller and baffle, the surface material is gradually lost and deformed.
The working conditions of the casting machine are very bad. There are always a lot of mineral dust and high temperature water vapor around the working environment. In the conveyor chain structure, the external roller is easy to be corroded by water vapor, and the roller works at the same time. The gap between the bushing and the bushing is also more susceptible to the invasion of dust, which in turn produces impurities under the influence of liquid aluminum, lubricating oil, etc., and the accumulation of impurities leads to bushing and rollers, pins, and rollers. The frictional drag distance between the components is accompanied by the persistence of the rust.