Belt conveyors are available in a variety of forms, including grooved belt conveyors, flat belt conveyors, climbing belt conveyors, roll belt conveyors, and turning belt conveyors. Commonly used belt conveyors can be divided into: ordinary canvas core belt conveyor, steel rope core high-strength belt conveyor, full explosion-proof belt conveyor, flame-retardant belt conveyor, two-speed double belt conveyor, reversible movement Belt conveyor, cold tape conveyor, etc. According to the type, there are chain conveyors, double speed chain conveyors, roller conveyors, plug-in lines, shelf lines, drying lines, belt conveyors. The belt conveyor is mainly composed of a frame, a conveyor belt, a belt roller, a tensioning device, a transmission device and the like. The working principle of the belt conveyor is a conveyor belt supported by the upper and lower rollers as a carrier member and a traction member, and a conveying mechanism that forms a closed loop around the head and tail rollers, which is transmitted by friction between the driving roller and the conveyor belt. Power, material delivery. It can be used to transport materials horizontally, obliquely upwards, and obliquely downwards.
The screw conveyor is divided into a shaft screw conveyor and a shaftless screw conveyor in the form of conveying, and is divided into a U-shaped screw conveyor and a tubular screw conveyor in the outer shape. Axial screw conveyors are suitable for non-stick dry powder materials and small granular materials (eg cement, fly ash, lime, grain, etc.) and shaftless screw conveyors are suitable for conveyors from viscous and entangled materials. (For example: sludge, biomass, garbage, etc.) The working principle of the screw conveyor is that the rotating spiral blade transports the material and carries the screw conveyor, so that the force of the material not rotating together with the screw conveyor blade is the weight of the material itself. The frictional resistance of the screw conveyor casing to the material. The spiral blade welded on the rotating shaft of the screw conveyor has a solid surface type, a belt surface type, a blade surface type and the like according to different materials to be conveyed. The screw shaft of the screw conveyor has a thrust bearing at the end of the material moving direction to give the axial reaction force of the spiral with the material. When the length of the machine is long, the intermediate hanging bearing should be added.
The belt conveyor has the following advantages: long conveying distance; large conveying capacity; simple structure, less capital investment and low operating cost; the conveying line can be arranged horizontally, obliquely or in a horizontal direction and in a vertical direction, so that it is less restricted by terrain conditions; The operation is simple, safe and reliable, and easy to realize automatic control and the like.
The disadvantage is that the tape is susceptible to wear, the slope is not too large, the friction is large, and the equipment costs are large.
The screw conveyor has the advantages of simple structure, small cross-sectional dimension, good sealing performance, reliable operation, low manufacturing cost, convenient intermediate loading and unloading, reversible conveying direction, and simultaneous conveying in opposite directions. The material can also be stirred, mixed, heated and cooled during the conveying process. The material flow can be adjusted by loading and unloading the gate. However, it is not suitable to transport materials that are prone to deterioration, viscous, agglomerate and bulky materials.
However, the material is easily broken during the conveying process, and the spiral and the trough are easy to wear. The unit power is large. In use, the tightness of the trough should be maintained and there should be a proper gap between the spiral and the trough.