Conveyors: power-driven – Conveyor section – Endless conveyor
Patent
1989-06-09
1992-11-10
Valenza, Joseph E.
Conveyors: power-driven
Conveyor section
Endless conveyor
198827, 198830, B65G 1508
Patent
active
051616750
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a tubular belt conveyor system in which a conveyor belt moves, partially in a flat, spread-out or trough-like shape and partially in the shape of a tube formed by steady curving of the belt in the transverse direction and overlapping of the longitudinal edges of the belt over support, guide and drive rollers which cooperate with a plurality of frames arranged along its path.
DE-OS 3,145,899 discloses a tubular belt supporting device for a tubular belt conveyor in which rotatable support rollers are arranged within and fixed to supporting frames at certain distances along the belt, with each row of support rollers being supported in the direction of the circumference of the belt precisely over its circumference.
A similar device is disclosed in DD-PS 202,124, which includes a supporting structure having the geometrical shape of an elongate ellipsoid which has a polygonal, preferably hexagonal, opening in each of its upper and lower halves through which pass the upper and lower flights, respectively. Six support rollers are disposed at each one of the six lateral edge sections and lie against the circumference of the tubular belt so as to guide it.
Additionally, DE-OS 3,606,129 discloses a tubular belt conveyor system in which the tubular belt is supported all around by support rollers which are arranged in the form of roller garlands. Two roller garlands are provided, one of which encloses roughly the lower half and the other roughly the upper half of the tubular belt cross section. The roller garlands are articulatedly supported at vertical arms of a supporting frame and the rollers which rotate on their axes are articulatedly joined with one another by way of intermediate members.
Furthermore, U.S. Pat. No. 4,526,272 discloses a suspension for a tubular belt conveyor for use underground. The tubular belt is displaceably hinged by way of the suspension to a double-T rail and cooperates with the discharge end of a recovery machine. The suspension is configured in such a manner that it receives the empty as well as the loaded flight simultaneously, with in no case the belt edges overlapping one another. The suspension is configured in such a manner that constant rotation in the circumferential direction can be realized. Since, due to different load states, different tension forces are present in the empty flight as well as in the full flight, it is not impossible that the non-guided belt flips over during its travel and is emptied.
As in normal belt conveyor systems, conveyors having a belt that is shaped into a tube also offer the opportunity to employ roller garlands in addition to fixed roller stands. Some arrangements are listed above. Although a roller belt does not involve the danger of lateral escape of the belt, a possibility must be found, on the one hand, to prevent unintentional rotation of the tubular belt and, on the other hand, for intentional rotation of the tubular belt, to set the rollers in such a way that the overlap region is always covered by one of the rollers. Moreover, the edge of the belt must be prevented from running onto the frontal face of the next roller. Since the behavior of the tubular belt on its path, particularly with respect to constantly changing load states and external influences (rain, snow, etc.) cannot be calculated precisely in advance, the prior art solutions are unable to meet the above listed requirements. Particularly the above-mentioned external circumstances, such as rain, snow, etc., cause uncontrolled twisting of the belt, particularly on a straight path.
It is the object of the invention to modify the conventional devices so that it can be set to all requirements for the tubular belt during its travel. For economic reasons it should be desired to make the suspension uniform over the entire path and to consider the various required positions of the supporting rollers in one structure. In particular, the regions of the path of tubular belt conveyors on which problems may be encountered should be manageable in such a way that the belt
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Vol. 9, No. 179 (M-399) [1902], Jul. 24, 1985, "Carvedly Running . . . ".
Alles Rainer
Engst Wilhelm
Hartwig Markus
PWH Anlagen & Systeme GmbH
Valenza Joseph E.
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