What is the purpose of lubricating equipment? What are the requirements for lubrication?

Answer: Like other mechanical equipment, cranes also have relatively moving parts. In order to control the friction resistance between them, reduce energy consumption, reduce the wear speed of parts and improve the service life of equipment, they need to be lubricated. In addition, lubrication has the functions of heat dissipation, dust prevention, rust prevention and shock absorption. When selecting lubricant, it is necessary to determine its type and brand according to factors such as movement, surface smoothness, working conditions and environment, characteristics of lubricant and so on. The general requirements for lubricants are: 1, with appropriate viscosity; 2. Good lubricity (oiliness); 3. It has certain oil film strength and stability; 4, non-corrosive. The working conditions of lubricant should consider the factors such as speed, load, gap, temperature and whether the surrounding environment contains moisture, acid, alkali and so on. In use, lubricants are often oxidized by air due to temperature rise and other reasons, resulting in acid, gum and asphaltene. Trace acid moisture will also accelerate the corrosion of parts surface. These will deteriorate the lubricating oil, shorten the service life, block the oil circuit, interrupt the oil circulation, reduce the heat dissipation effect, and even burn the friction surface. As a result of the oxidation of grease, the acidity will also increase, so that the thickener will be separated from the oil, and the grease will dry and lose its lubricity. Antioxidant additives are usually used to prevent oil oxidation. Temperature rise is an important factor to promote lubricant oxidation. Therefore, in addition to the use of antioxidant additives, it is also necessary to reduce the use temperature of lubricants. It is generally best not to exceed 60 degrees Celsius. If the temperature exceeds 60 degrees Celsius,