Bearing condition of vacuum packing machine
Bearing condition of vacuum packing machine. The assembly process of vacuum packing machine needs to use many machine components. Bearing is an important part used to support the shaft and enable it to achieve rotary motion. The reliability, bearing capacity, life span and transmission efficiency of the machine are closely related to the correct selection (or design) of the bearing.
Bearing condition of vacuum packing machine. Bearings have two main functions in a machine: supporting the shaft or rotating parts on the shaft to maintain the shaft's rotation accuracy; Reduces friction and wear between the shaft and the support when rotating. The price of vacuum packing machine is according to different configuration.
Bearing condition of vacuum packing machine. According to the friction properties of working components, bearings can be divided into sliding bearings and rolling bearings. Sliding bearings can be divided into liquid friction sliding bearings and non-liquid friction sliding bearings according to their different friction states. Food packaging machine plays an important role in the field of food packaging.
Bearing condition of vacuum packing machine. Sliding bearing on the job, as a result of relative sliding velocity, load, lubrication condition and journal and bearing shell materials and working surface roughness, sliding bearing friction condition is different, can be divided into: 1. The liquid friction state under certain conditions, and maintain a sufficient thickness formed between journal and bearing of a layer of oil film pressure, thereby the sliding between journal and bearing surface completely separated so that the friction and wear between the metal, this state is called liquid friction state.
Bearing condition of vacuum packing machine. The working resistance of the bearing in the state of liquid friction is mainly the internal friction resistance and friction coefficient of lubricant (f0.001~0.008), which is an ideal friction state.
Bearing condition of vacuum packing machine. Non-liquid frictional state other than liquid frictional state are collectively referred to as non-liquid frictional state which can be divided into three states: dry friction, boundary friction and mixed friction.
Bearing condition of vacuum packing machine. Dry friction state direct contact between two friction surfaces (journal surface and bearing hole surface) is called in the friction state. At this point, the friction coefficient is large (f=0.1~0.5). In actual production, if the bearing is in the dry friction state, its wear and heat will be very serious, causing tile burning and making the bearing useless, serious will also ignite the flammable dust around (such as flying flowers in the textile factory) cause a fire. So this state of friction has to be avoided.
Bearing condition of vacuum packing machine. There is a small amount of lubricant between the two friction surfaces in the boundary friction state. As there is adsorption between the molecules on the metal surface and the lubricant molecules, an extremely thin adsorption oil film (less than 0.1um) is formed on the metal surface, which is called the boundary oil film. Due to the boundary of oil film thin enough to be separated the two metal surface completely, also because of the two metals and rub each other micro rough surface cutting, so there is still a friction and wear between shaft and bearing, the friction state called a boundary friction state so boundary friction state, though not completely disappear to wear on the surface of the metal, but can significantly reduce the friction and wear. At this point, the friction coefficient is much lower than the dry friction state (f=0.01~0.1).
Bearing condition of vacuum packing machine. Mixed friction state is a kind of friction state which is mainly composed of liquid friction state and boundary friction state and accompanied by partial dry friction state. It is called mixed friction state. The friction coefficient is about 0.005~0.1. In practical production, dry friction of bearings is not allowed to exist, and boundary friction cannot exist alone, so most of them belong to mixed friction state.