Screw conveyor

Spiral Conveyor,Spiral Ascrew conveyor 

Spiral conveyor is a mechanical device that uses an electric motor to drive a spiral to rotate and push materials to achieve the purpose of conveying. It has the advantages of simple structure, small cross-sectional area, good sealing, convenient operation, easy maintenance, and convenient enclosed transportation. Spiral conveyors are divided into two types in terms of conveying form: axial spiral conveyors and shaftless spiral conveyors. They are also divided into U-shaped spiral conveyors and tubular spiral conveyors in terms of appearance. Axial screw conveyors are suitable for non viscous dry powder materials and small particle materials (such as cement, fly ash, lime, grain, etc.), while non axial screw conveyors are suitable for materials that are viscous and easily entangled. The working principle of a screw conveyor (such as sludge, biomass, garbage, etc.) is that the rotating screw blades push and transport the material to the screw conveyor, so that it is not affected by the self weight of the screw conveyor blades and the frictional resistance of the screw conveyor housing on the material. The spiral blades welded on the rotating shaft of the screw conveyor have different surface types depending on the conveying material, including solid surface type, belt surface type, and blade surface type. At the end of the material movement direction, the spiral shaft of the spiral rod is matched with the thrust bearing to feed the axial reaction force of the spiral. When the machine is long, an intermediate suspension bearing should be installed.

working principle

When the spiral shaft rotates, due to the gravity of the material and the friction between the material and the groove wall, the material can only move forward along the bottom of the conveyor groove under the push of the blade, just like a non rotating spiral shaft moving in translation along the blade. The transportation of materials in the middle bearing depends on the thrust of the materials moving forward later. Therefore, in material transportation, materials are completely a sliding motion. In order to keep the spiral shaft in a more favorable stretching state, the driving device and the discharge port are usually installed at the same end of the conveyor, and the feed port is as close as possible to the tail of the other end. The rotating spiral blades push the material during transportation, and the force that prevents the material from rotating together with the spiral conveyor blades is the weight of the material itself and the frictional resistance of the spiral conveyor shell against the material. Spiral conveyor manufacturers have different types of blade surfaces based on the conveyed material, including solid surface type, belt surface type, and blade surface type. The screw shaft of the screw conveyor has a thrust bearing at the end of the material movement direction, which together with the material exerts a reaction force on the axial direction of the screw. When the machine is long, a middle suspension bearing must be added.

Characteristics and Applications

Spiral conveyor has the following characteristics

1) The structure is relatively simple and the cost is low.

2) Reliable work, convenient maintenance and management.

3) Compact size, small cross-sectional dimensions, and small footprint; Easy access to hatches and carriages during port unloading operations.

4) Sealed transportation can be achieved, which is beneficial for transporting materials that are easy to fly, hot, and have strong odors, reducing environmental pollution, and improving the working conditions of port workers.

5) Easy loading and unloading. The horizontal screw conveyor can be loaded and unloaded at any point on its conveying line; The configuration of a vertical spiral conveyor with a relatively spiral material retrieval device can have excellent material retrieval performance.

6) It can be conveyed in reverse, or it can make a conveyor move in two directions at the same time, namely centralized or decentralized conveying.

7) The unit energy consumption is relatively high.

8) Materials are prone to crushing and wear during transportation, with severe wear on spiral blades and material troughs.

Application scope

Spiral conveyors are widely used in industries such as building materials, chemical, power, metallurgy, coal mining, and grain. They are suitable for horizontal or inclined transportation of particles such as powder, coal ash, coal slag, cement, and grain, with temperatures below 200 ℃. Spiral conveyors should not transport materials that are prone to deterioration, viscosity, or clumping. The role of screw conveyors in concrete mixing plants has been demonstrated to some extent.

(1) Spiral conveyor is a widely used conveying equipment in industries such as chemical, building materials, and grain, mainly used for conveying powders, particles, and small pieces of materials. Not suitable for transporting materials that are prone to spoilage, viscosity, and clumping.

(2) The environmental temperature for the use of spiral steel wire rope is -20~50 ℃; The inclination of the steel wire rope is β ≤ 20 °; The conveying length is generally less than 40m and up to 70m.

(3) Compared with other conveying equipment, spiral conveying has the advantages of simple structure, small cross-sectional size, good sealing, the ability to add and unload materials in the middle of the material and discharge, safe and convenient operation, and low manufacturing cost. Its disadvantages are: severe wear and tear of mechanical parts, small conveying capacity, high power consumption, and easy breakage of materials during transportation.Conveyor,Spiral Conveyor Manufacturer