Conveyors: power-driven – Conveyor section – Endless conveyor
Patent
1998-03-24
2000-07-25
Valenza, Joseph E.
Conveyors: power-driven
Conveyor section
Endless conveyor
198821, B65G 1534
Patent
active
060926457
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates primarily to a conveyor belt and more particularly, but not exclusively, to a conveyor belt that can be included as an endless conveyor path.
Such conveyor belts will normally comprise an upper ply, a load-absorbing intermediate ply and a bottom ply.
By "ply" is meant here a layer of material, such as rubber or like material that has unitary properties.
By "layer" is meant here a layer of material such as rubber or the like that has unitary properties, where a layer will normally be thinner than a "ply".
Thus, it is possible within the scope of the invention for a "ply", as used here, to include a number of layers.
The boundaries between "layer" and "ply" will vary in the practical application of the invention.
The construction of conveyor belts of this particular kind can be generalized by saying that even though the entire cross-section of the belt exhibits homogenous properties, the cross-section can nevertheless be considered to consist of a plurality of integrated plies for the sake of simplicity. A bottom ply will then be dimensioned and adapted as a wear protector which protects the belt against wear from one or more belt-supporting devices, such as belt-supporting and belt-deflecting rollers, an intermediate ply which includes an integrated load-absorbing fabric structure, such as a carcass, cord structure or the like and an upper ply which is adapted to protect against wear by transported goods or the like.
When the conveyor belt is an endless belt, the bottom ply will have an inwardly facing wear surface which runs along support rollers and belt-deflecting rollers and which generates together with a drive roller sufficient friction to drive a loaded conveyor belt with only a small amount of belt slipping.
The upper ply has an outwardly facing wear surface which supports the goods and material being conveyed and which generates sufficient friction against the goods or material to cause said goods or material to accompany the belt as it moves.
The load-absorbing fabric structure in the intermediate ply is dimensioned to take-up the tensile forces that act in the belt when in operation, and primarily to take-up those forces and loads that occur when starting a loaded conveyor belt and accelerating the belt to a normal conveyor speed.
The intermediate ply may conveniently be dimensioned and consist of a material that has a high degree of hardness, for instance a hardness above 65.degree. Shore A, and a high modulus of elasticity or E-modulus, because the bending forces are small and material in or adjacent to the bending axis does not need to have a high degree of elasticity.
Conveyor belts of the aforesaid kind find use in many different applications. However, the inventive conveyor belt has been developed primarily for its inclusion as an endless conveyor path for conveying paper rolls comprising rolled-up paper webs, where the conveyor belt is positioned flush with or at least in the close proximity of a surrounding floor surface.
DESCRIPTION OF THE BACKGROUND ART
Several different types of conveyor belts constructed of several plies and/or layers are known to the art.
A common feature of these known conveyor belts is that respective plies and/or layers are normally comprised of rubber or a like flexible/pliable material, and that the plies and layers are firmly bonded to one another, preferably integral with one another.
Thus, it can be mentioned that Patent Publication SD-A1-1 694 443 teaches a conveyor belt which comprises a central flexible ply (3) which is reinforced longitudinally with two outer rubber protectors (1) which are mutually separated with the aid of an intermediate ply provided with cord reinforcements (2).
It is proposed in this publication that the centre ply shall be thicker than the remaining plies.
The European Patent Specification 0 142 716 teaches a conveyor belt that comprises different materials in different plies. The belt is comprised of an uppermost supportive ply 12 which shall have a hardness of 85.degree.-100.deg
REFERENCES:
patent: 381456 (1888-04-01), Woodbury
patent: 599926 (1898-03-01), Bowers
patent: 707355 (1902-08-01), Ridgeway
patent: 1100654 (1914-06-01), Church
patent: 1484248 (1924-02-01), Austin
patent: 2121650 (1938-06-01), Berman et al.
patent: 2303762 (1942-12-01), Reimel et al.
patent: 2748044 (1956-05-01), Seiler
patent: 2875116 (1959-02-01), Smith
Bower Kenneth W.
Valenza Joseph E.
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