Conveyors: power-driven – Conveyor section – Bucket
Patent
1998-05-13
2000-02-15
Terrell, William E.
Conveyors: power-driven
Conveyor section
Bucket
198713, B65G 1736, B65G 1744
Patent
active
060242094
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a cleat for a conveyor belt of elastomeric material, particularly for a vertical conveyor, with a cleat foot attachable to the support side of the conveyor belt.
DESCRIPTION OF THE RELEVANT ART
Conveyor belts are known in mining. They are used at an inclination of about 70.degree. as inclined conveyors, or as vertical conveyors, with an even higher inclination. The cleat sections of such a conveyor belt, which form the transverse walls of the buckets for receiving the bulk material, generally firstly extend over two-thirds of their height at right angles to the belt surface and thereafter turn over at an angle of about 45.degree.. However, the straight section of the cleat does not permit any ejection of material directly from the upper turning drum of the conveyor belt, as at the discharge over-run of the upper turning roller, bulk material remains on the straight section of the preceding cleat and is thus taken back down again. This problem is generally counteracted in that the conveyor belt is deflected beneath the turning drum (head station) by means of a deflecting drum, so that bulk material can be totally emptied.
However, the demands made on conveyor belts in mining are always increasing, as conveyance must be made from ever-increasing depths. This requires greater lengths of the conveyor belt, so that the intrinsic weight of the conveyor belt, which is decisive in comparison to the bulk material alone, is increased. By means of deflection of the conveyor belt, the belt's free lateral zones are loaded with the entire weight of the suspended back length of the conveyor belt, so that extremely high specific belt strengths become necessary which, in turn, due to the intrinsic weight of the conveyor belt, restrict the height to which conveying may be carried out.
In order to address this overall problem, attempts have been made in the prior art to use so-called "oblique cleats", which are inclined at a constant angle of about 45.degree. to the belt surface. With such oblique cleats, ejection of the bulk material begins immediately after leaving the upper dead center point and is effected substantially freely without contact with the preceding cleat. However, the problem in such an oblique cleat resides in attaching the cleat with a secure hold on the surface of the belt.
A two-part cleat for a vertical conveyor is known from the publication DE 971 983, which has a cleat foot integrally formed with the conveyor belt, and a cleat section made of sheet metal that forms the transverse wall of the conveyor belt. The cleat section is secured by means of a counterplate and a screw connection to the cleat foot.
U.S. Pat. No. 3,537,571 discloses a chain conveyor of the toothed belt type, with carrier rods which extend transversely to the direction of travel of the conveyor belt in the tooth blocks of the conveyor belt and which project laterally beyond the conveyor belt, where they are connected together by spoke-like lateral members. The spoke-like lateral members are extended beyond the support side of the conveyor belt and include a further carrier rod between the two extended ends of the spoke-like lateral members, upon which a bucket or tub-like conveyor member can be attached by means of a hook. FIG. 3 of U.S. Pat. No. 3,537,571 further discloses the use of two carrier rods having threaded holes into which bolts are screwed, upon whose upper ends a conveyor member is to be attached.
However, U.S. Pat. No. 3,537,571 does not really relate to a conveyor belt, but to a chain conveyor, as described for example in U.S. Pat. No. 4,177,891. The buckets or tubs shown in U.S. Pat. No. 4,177,891 are of such a type as are to be attached to the hook of the chain conveyor of U.S. Pat. No. 3,537,571.
Two-part cleats for conveyor belts of the type already mentioned are known from the publications DE 91 05 048 U, DE 38 35 619 C2 and DE 42 40 201 C1. The cleat feet of these known cleats have a groove, rectangular in cross-section, into which a cleat section forming
REFERENCES:
patent: 1432002 (1922-10-01), Wentz
patent: 2875887 (1959-03-01), Hinchcliffe
patent: 3537571 (1970-11-01), Weise
patent: 4248340 (1981-02-01), Hild
patent: 5660266 (1995-01-01), Nolte
Deuble Mark
SVEDALA Industri (Deutschland) GmbH
Terrell William E.
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