Conveyors: power-driven – Conveyor section – Load simultaneously engaged between and moved by a plurality...
Patent
1983-05-12
1986-04-08
Valenza, Joseph E.
Conveyors: power-driven
Conveyor section
Load simultaneously engaged between and moved by a plurality...
198605, 198640, B65G 1514
Patent
active
045806772
DESCRIPTION:
BRIEF SUMMARY
The object of the present invention is a belt conveyor to be used for steep or vertical conveyance of bulk material.
A belt conveyor of this type can be designed as a so-called L-conveyor wherein the carrier end of the conveyor belt runs horizontally or at a slight incline through a section for loading the bulk material and then rises steeply or in a vertical direction from a deflecting arrangement after the loading point towards a discharge drum situated above it, while the return end runs parallel or at least generally parallel to the carrier end. The guard cover provided for the discharge drum, which in known belt conveyors is designed as a stationary device, for example in the form of a baffle box, should prevent a scattering of the bulk material at the discharge drum and should ensure a relatively orderly discharge parabola. However, at high conveying speeds--and only such speeds make economic sense with higher conveying output--known guard covers, in any case, fail to function as expected when the conveyance is rather steep or vertical due to the high centrifugal forces that bear upon the bulk material at the discharge drum. For this reason, so-called L-conveyors have not been successful in practice for such applications.
A certain improvement of the bulk material discharge is achieved with so-called S-conveyors wherein the carrier end, after a second deflection at the upper end of the steep or vertical conveying track, runs generally horizontally towards the discharge drum. However, S-conveyors of this kind are far more expensive to construct than L-conveyors because of the second deflection of the carrier end and the corresponding further deflection also for the return end. In addition, there is the particular disadvantage that the calculation of strength for the conveyor belt may in principle be based only on the edge areas of the conveyor belt. This is due to the concave deflection of the return end of the conveyor belt as it leaves the discharge drum from the horizontal into a steep or vertical downward direction. In view of the fact that the respective deflection means can engage the conveyor belt only at a narrow area along its edges outwardly of its corrugated side walls or, at most, upon the top thereof, the entire tension load applied to the conveyor belt at the deflection means is practically distributed over only its two edge areas and as a result a considerably higher tensile stress occurs in those areas than if there were an even distribution of the tension load over the entire width of the conveyor belt. However, since the conveyor belt is to be rated over its entire width for the highest tensile stress possible, there exists a need for a conveyor belt whose entire loading capacity is greater than that which would be actually required for any specified conveying capacity.
Accordingly, it is the aim of the present invention to provide a belt conveyor for steep or vertical conveyance of bulk material which ensures, despite high conveying speeds, an orderly, practically scatter-free bulk material discharge at the discharge drum at a minimum construction cost as compared to the S-conveyor and without the necessity of providing an "oversized" conveyor belt.
In the belt conveyor according to the present invention, the guard cover associated with the discharge drum, is designed as a cover belt such that even with vertical motion of the conveyor belt's carrier and return ends on either side of the discharge drum, an orderly, practically scatter-free bulk material discharge takes place at the discharge drum. As a result, it is for the first time possible in practice to utilize the structural advantages of the so-called L-conveyor for the steep and vertical conveyance of bulk material, including the particularly significant advantage of being able to do with a conveyor belt sized to just meet the conveying capacity needed. The cover belt according to the concept of the present invention need be applied to the conveyor belt only within the deflection zone of the discharge drum, that is, not in th
REFERENCES:
patent: 1080501 (1913-12-01), Tibyrica
patent: 3881590 (1975-05-01), Hartmann
patent: 4273238 (1981-06-01), Blattermann et al.
Field Milton M.
Stone Michael
Valenza Joseph E.
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