Screw ship unloader manufacturers talking about the characteristics of mobile screw ship unloader

Mobile screw ship unloader has six main features, the following screw ship unloader manufacturers take you to understand. 1) Screw ship unloader manufacturers have high ship unloading efficiency. The rated productivity of the screw unloader can be as high as 2000 t / h. another important sign of its high efficiency is its large average working capacity. Because the ship unloader is equipped with reverse rotating reclaiming device, the material flows in the conveying pipe at a uniform speed, and the filling rate of the vertical screw conveyor can reach 70% - 90%. The walking of the gantry, the rotation of the fuselage, the pitching of the horizontal arm and the swing of the vertical arm of the screw ship unloader make the reclaiming device reach any position in the cabin, and the reclaiming device has the functions of automatic loosening and tunneling. Therefore, no matter how the fluidity of the material is, the ship unloader can continuously work close to full load before there is only 30cm ~ 50cm thick material layer left from the bilge The productivity can reach more than 70% of the rated productivity.

2) Strong adaptability to cargo and ship type. Screw unloader can be used to unload various powdery, granular and blocky materials. When unloading some materials that are compacted or even hard shell after being transported by sea, such as fertilizer, cement, potassium salt, etc., because the reverse reclaiming screw or loosening knife installed outside the reclaiming device has the function of loosening the materials, it can well meet the requirements of ship unloading. The vertical section size of the screw unloader is small, and the auxiliary mechanisms such as walking, turning, pitching and swinging ensure the flexible action of the screw unloader. It can be suitable for various types of barges and seagoing ships.

3) The environmental pollution is small. The material conveying system of the screw ship unloader is totally enclosed, so there is no dust flying and no leakage of material or material odor during the unloading operation. It is particularly advantageous to use screw unloader for the materials that easily pollute the air, such as cement, pulverized coal, chalk powder, potassium salt, ammonium phosphate and so on. The noise level of the screw unloader can be controlled below 60dB (a).

4) The structure is simple and the mass is small. The material conveying system of screw ship unloader is composed of screw conveyor without flexible traction component. The conveyor has no return branch, the structure is relatively simple, and the section size of vertical arm and horizontal arm is small. Under the condition of the same productivity as the object ship, the mass of screw ship unloader is much smaller than that of grab ship unloader, and it is also the smallest of all kinds of mechanical continuous ship unloaders. Therefore, the cost of screw ship unloader is low, and the requirement of wharf bearing capacity is low.

5) The wear of working components is serious. The main wear parts of screw ship unloader are the intermediate bearing of conveying screw and vertical screw conveyor. Because of the relative sliding between screw and material, and the relative sliding between the edge of supporting screw and bearing bush in the middle bearing is unavoidable, the main way to improve the service life of working components is to use materials with good wear resistance, which will increase the cost of screw ship unloader.

6) Energy consumption is high. Due to the friction between the material and the spiral surface, the friction between the material and the material groove or the wall of the conveying pipe, and the friction and mixing between the materials, the transport resistance of the material per unit length is large, which makes the unit energy consumption of the screw ship unloader higher than that of other mechanical continuous ship unloaders, equivalent to that of the grab ship unloader, but much lower than that of the pneumatic ship unloader. The figure shows the unit energy consumption of the screw unloader when unloading various materials. The unit energy consumption is lower for the materials with less weight, better fluidity and less grindability, such as cement, grain and coal, while the unit energy consumption will increase significantly for the materials with more weight and greater grindability, such as phosphate and iron ore powder.