Screw Conveyor Application in Steel Silos

Equipment for grain transportation

The screw conveyor is a kind of continuous transport equipment, mainly used for transporting powder, granular, and fine materials. Its advantages include simple structure, small cross-sectional area, intermediate multi-point loading and unloading, safe and convenient work, and low production costs. It is widely used in grain silos and dry bulk storage silos for material input and output.

Improvement of the screw conveyor for steel silo

Small diameter steel silos often use hopper bottom, and the material can be unloaded by gravity because the inclination angle of filler and silo is larger than the slope of material. When the diameter of steel silo is larger, the height of silo and the height of inclined slope will increase, and the construction cost will also increase, thus affecting the storage capacity. It's not economic. In this case, people tend to choose flat-bottomed silos and use screw conveyors for unloading.

The machine for cleaning screws consists mainly of blades, a screw shaft, a screw, partitions and a transfer device. The machine used to clean the screws does not have the outer casing of the conventional screw conveyor and the ends of the support bearings. One end of the screw shaft is fixed to the transfer device, which is installed in the center of the steel silo, and the other end is not fixed. The auger blade is welded to the screw shaft. The partitions are attached to the screw shaft through the screw. In accordance with the functions of the transfer device, the helical shaft and the blade not only perform axial movement, but also make circular motions, since the center of the transfer device is located in the center of the silo along the silo because of its horizontal circular motion. This allows the cleaning machine to perform cleaning of the pile material during late cleaning within the steel silo.

During the unloading process of the silo, most material relies on gravity and will first spontaneously flow out of the main hole in the middle of the silo. When the first step is completed, the auxiliary discharge groove will open in order that the individual pieces of material dumped in the worm cleaning machine naturally flow out. After reducing the load of the machine for cleaning the screw, the machine will begin to clean the folded material. There is also another situation where the machine for cleaning the augers directly starts the screw unloading system without a self-flowing material process. In this situation, the installation for cleaning the screws must have a relatively large capacity and special construction equipment. There is also another situation where the machine for cleaning the augers directly starts the screw unloading system without a self-flowing material process. In this situation, the installation for cleaning the screws must have a relatively large capacity and special construction equipment.

Screw unloader

The unloading screw device is not a traditional conveyor, but uses the screw principle. The principle of loading for a traditional silo is that the material falls freely to the bottom of the silo. In this process, the material received a high speed with a lot of energy due to gravity. When colliding with the bottom of the silo, the material breaks easily. This can change the properties of the material. For materials with stringent requirements, this is not applicable. To change this situation, a screw loading mechanism of steel silo has been developed.

It includes an upper bracket and a lower bracket, respectively located horizontally in the lid and bottom of the silo. The transport plate is spirally mounted on the support shaft in the order from top to bottom. The central position of the transport plate forms a shallow groove. The outer edge of the transport plate is provided with a partition. The device is simple in a structure that can effectively avoid damaging the brittle material. In this case, the material enters the silo and falls onto the screw of the transport plate, connected to the loading inlet. The material will spirally flow along the transport plate downward and slide to the bottom of the silo, which can slow the rate of fall of the material and prevent its destruction.

In practice, it has been proven that improvements in steel silo have achieved good results.