Conveying Capacity and Power Requirement of the Vertical Double-Belt Conveyor

Study on development of vertical double-belt conveyors (2nd Report)

Abstract

In order to put a vertical double-belt conveyor into practicaluse, it is necessary to know its conveying capacity and power requirement. Although much information is available for the ordinary belt conveyor, there has beenlittle information forthe vertical double-beltconveyor. In this investigation, the experlmental data, which are reported in the previous paper, are analyzed in order to obtain such information.
The main results are as follows;
1) For vertical double-beltconveyors with roller arrangement that is geometrically sinlilar to that of the experimental apparatus, the maximum sectlonal area of the load is given by the formula;
A=0.04B²
2) The tractive force per span is proportional to the normal load to the rollers whenno materials is conveyed.
3) When nlaterial is conveyed, the additional tractive forceis almost proportional to the sectional area of the load.
4) Whe material is conveyed, the additional tractive force increases with the increase of the degree of offset of the rollers.
5) Running resistance of the belts is generated in different mechanisms when coal is conveyedand when sand is.
6) Overall tractive force can be calculated by the formula;P= {(1+ζ) N-1}{(1+φ) T_o+ψ+η/ζ} +φT_o+ψ,
where T_o is the minimum tension of thebelts, N is the number of spans, and φ, ψ, ζ and ηare coefficients given as functions of the sectional area of theload, the trough angleand the degree of offset.