Conveyors troughed

Design Variations. Vibrating conveyor troughs can be custom-designed for particular needs. Troughs can be rectangular, with or without... 

Screw Conveyors-Trough TypeforIndustrialEse, British Standard BS 4409, Part 1, British Standards Institution, London, 1969. 

Conveyors Troughed belt Flat belt Screw, steel Screw, stainless Bucket elevator Pneumatic... 

Fia. 6-7. Installed extra coat for standard thickness conveyor troughs of varying diameter (ENR = 750). 

Fiq. 6-8. Installed extra cost for heavy gauge thickness conveyor troughs based on -in. thickness of carbon steel (ENR = 750). 

The vibratory trough accelerates the material to such an extent that, when the forward movement of the trough is greatly retarded just before the end of the stroke, the material "becomes airborne" and travels in a parabolic trajectory until it falls onto the bottom of the trough, when it receives a fresh impulse, and so on. In this way it hops along, as it were. On the other hand, on the shaker conveyor the material is not thrown up into the air, but merely slides along, because on the return stroke of the conveyor trough the static friction between it and the material is temporarily cancelled. 

When bulk materials slide against containing walls of conveyor troughs they cause an additional pull on the conveyor. This factor, J, can be calculated by referring to Figure 9-40 and using Equation 9.2. 

Fig. 1. (a) Belt conveyor and support assembly, (b) 20° troughing idler, and (c) return idler. 

Take-Ups. A take-up is requited on a belt conveyor to ensure the proper belt tension at the drive pulley and along the conveyor, as weU as to ensure the proper troughing contour between idlers. A take-up is also needed to compensate for changes in belt length caused by elastic stretch during start-up, and any elongation characteristics of the belt that occur over a period of time. 

Air Cushion Conveyors. Figure 3a shows an air cushion-supported belt conveyor. The belt and material are supported on an air film created by passing air through small holes or slots in a U-shaped trough beneath the belt. The air film reduces the conveying friction losses, resulting in a reduction in requited... 

On a reciprocating conveyor, material is carried forward in a horizontal direction by frictional contact with the trough. Inertia causes the material to be left in that position as the trough is quickly returned to the initial position. These conveyors are useful for handling granular free-flowing materials with a minimum of attrition. 

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