From the perspective of the displacement direction of conveying materials, screw conveyors are divided into two types: horizontal screw conveyors and vertical screw conveyors. They are mainly used for horizontal conveying of various powder, granular and small pieces of loose materials. And vertical lifting, this machine is not suitable for conveying special materials that are easily deteriorated, viscous, easy to agglomerate or high temperature, afraid of pressure, and highly corrosive.
The characteristics of the screw conveyor are: simple structure, small cross-sectional size, good sealing, reliable operation, low production cost, convenient intermediate loading and unloading, and the conveying direction can be reversed or conveyed in opposite directions. During the process, the materials can also be stirred, mixed, heated and cooled. The material flow can be adjusted through the loading and unloading gate. However, it is not suitable to convey materials that are perishable, viscous, easy to agglomerate and bulky. During the conveying process, the material is easily broken, and the screw and the trough are easily worn.
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The screw conveyor has the advantages of simple structure, low production cost, strong sealing, safe and convenient operation, etc. It can be loaded and unloaded at multiple points in the middle. It is widely used in chemical, building materials, metallurgy, grain and other departments. When the inclination angle is β<20°, it can transport powdery, granular and small pieces of materials that are not viscous, not easy to deteriorate, and not easy to agglomerate.
The extreme pressure of the gear oil is too strong and can cause corrosive wear. Vehicle gear oils should have moderate extreme pressure to maintain proper load carrying and corrosion resistance. In the past, four-ball extreme pressure tests were commonly used to evaluate vehicle gear oils. It was wrong to assume that the maximum card-less bite load and sintering load were better. In addition, different types of extreme pressure agents perform differently in the four-ball machine test. For example, the sulfur-phosphorous-chlorine-zinc type oil has a higher p. p. value than the sulfur-phosphorus type oil, but cannot be used to derive the former. The conclusion is that the carrying capacity is higher than the latter. In fact, the sulfur-phosphorus-type compounding agent is used in only half of the sulfur-phosphorus-chloro-zinc type compounding agent, but the carrying capacity is comparable or even better.