Screw Conveyor
Screw conveyor has the following characteristics
1) The structure is relatively simple and the cost is low [4].
2) Reliable work, easy maintenance and management.
3) Compact size, small section size, small footprint. It is easy to enter and exit hatches and compartments during unloading and unloading operations in the port.
4) It can achieve sealed transportation, which is conducive to conveying materials that are easy to fly, hot and strong odor, which can reduce environmental pollution and improve the working conditions of port workers.
5) Easy to load and unload. The horizontal screw conveyor can be loaded and unloaded at any point on its conveying line; The vertical screw conveyor is equipped with better material taking performance than the screw taking device.
6) Can reverse transport, can also make a conveyor conveying materials in two directions at the same time, that is, to the center or away from the center.
7) The unit energy consumption is large.
8) The material is easy to grind and wear during conveying, and the wear of spiral blades and chutes is also more serious.
Working principle of screw conveyor
When the spiral shaft rotates, due to the gravity of the material and the friction generated between the material and the tank wall, the material can only move forward along the trough bottom of the conveyor under the push of the blade, which is like the translation movement of a nut along the rotating screw that cannot be rotated . The main forward power of the material is from the spiral blade in the axial rotation of the material along the blade tangential direction upward and forward force.
In order to make the screw shaft in a more favorable tension state, the drive device and the discharge port are generally placed on the same end of the conveyor, and the feed port is placed near the tail of the other end as far as possible. The rotating spiral blade will push the material and transport it, so that the material does not rotate with the spiral conveyor blade is the material's own weight and the friction resistance of the spiral conveyor shell to the material. According to the different conveying materials, there are solid surface type, belt surface type, blade surface type and other types. The screw shaft of the screw conveyor has a thrust bearing at the end of the direction of material movement to react with the axial force of the material to the screw. When the captain is long, the middle hanging bearing should be added.
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