In steel rolling production, the metal billet must be heated to a certain temperature so that it has a certain degree of plasticity in order to be rolled. system. The heating of the metal blank mainly depends on the "heating furnace".
At present, the heating furnaces used in the steel rolling system of iron and steel enterprises are generally two-stage or three-stage heating furnaces, and the movement form of the billet in the furnace is generally a stepping type or a steel pushing type.
Heating furnace refers to the equipment (industrial furnace) that heats materials or workpieces (generally metal) to rolling forging temperature in the metallurgical industry, and can be divided into continuous heating furnace and chamber heating furnace. Heating furnaces are widely used in petroleum, chemical industry, metallurgy, machinery, heat, building materials, electronics, materials, light industry, and many other industries. The steel rolling heating furnace in the metallurgical industry is used to heat the steel parts that need to be rolled. According to different process requirements, it is required to maintain a certain temperature in the steel rolling heating furnace cavity. The temperature is obtained by burning fuel, and the effective combustion of fuel is controlled by the air volume blown by the blower of the heating furnace.
Because of its low speed, low failure rate, cheap price and relatively simple structure, the ejector machine is generally used on cargo three-wheeled motorcycles. The manufacturing structure of the chain machine is relatively complicated, so its engine power is relatively large, and the engine noise is also small, so it is generally used on two-wheeled motorcycles.
The damage of heating furnace is generally mainly caused by coking, which is formed by the joint action of many factors. Coking is a phenomenon in which the oil in the furnace tube is thermally cracked when the temperature exceeds a certain limit, becomes free carbon, and accumulates on the furnace tube. The damage process is: coking begins in the tube, which increases the temperature of the tube wall, thereby intensifying the oxidation of the surface and the corrosion of the furnace tube. Oxidation reduces the thickness of the pipe wall, and the thinned part is first bulged out under the dual action of internal pressure and heat. After the furnace tube is bulged, the gap between the inner wall of the tube and the coke layer increases, which gradually increases the temperature of other parts of the furnace tube, further oxidizes and thins, and finally leads to the rupture of the furnace tube.
A chain is a common transmission device. The working principle of the chain is to reduce the friction between the chain and the sprocket through the double curved chain, reduce the energy loss in the process of power transmission, and thus obtain higher transmission efficiency. The application of chain drive is mainly concentrated in some occasions with high power and slow running speed, which makes chain drive have more obvious advantages.
