Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1996-12-26
1999-09-28
Shah, Mukund J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
B32B 2504
Patent
active
059585706
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a laminated composite body, in particular conveyor belt, comprising a support which essentially determines a mechanical stability of the laminated composite body and at least one cover plate made of rubber, thermoplastic elastomer and/or plastics, which has a high resistance to mechanical damage in the form of notches, cuts or the like.
A particularly important example of a laminated composite body according to the invention is a conveyor belt.
2. Description of Related Art
The conveyor belt, as an essential component of belt conveying systems, essentially has to fulfill two tasks. The first task consists in transmitting a belt tensile force, in order to build up sufficient normal forces in the belt between the drive drums to be able to transmit the drive force by means of the friction on the belt. The tensile force for overcoming the kinetic resistance is taken up by the mechanical reinforcement arrangements situated in the belt. The conveyor belt furthermore has to transport material for conveying. The material for conveying is regularly thrown onto the conveyor belt, specifically from a height of up to 10 m. Since the material for conveying may also be sharp-edged rock or the like, the conveyor belt has to be configured such that the impact of the material to be conveyed on the conveyor belt does not lead to any damage to the belt. To this end, the conveyor belt is provided with a cover plate, which in particular has the function of protecting the mechanical reinforcement arrangement in the tension support layer, which serves as support, from damage, since damage of this kind impairs or destroys the operating capacity of the belt. Steel cable arrangements or arrangements of a plurality of layers of fabric are conventional for the reinforcement arrangement.
Due to continuous pelting from the particles of bulk material, the top layer of the cover plate of a conveyor belt becomes scarred during operation, sometimes forming relatively small notches. The notches or scars may become the starting point for slitting or hairline cracks, which propagate as a function of the operating conditions (belt speed, trough of the conveyor belt, spacing of the drive rollers), of the material being conveyed and of the belt properties, as a result of the continuously changing states and concentrations of stresses at the crack tip. This may result in penetration as far as the tension support layer, which places the operating capacity of the conveyor belt in doubt. In practice, therefore, a conveyor belt which is exposed to the bulk material over a relatively long period of time is replaced when the surface of the cover plate exhibits numerous scars and notches due to the continuous impact of the bulk material.
A known measure for increasing the service time consists in increasing the thickness of the cover plate. As a result, the energy required for penetration is increased. However, it is not possible to prevent notches and cuts leading to penetration through even the greater thickness of the cover plate. The effect achieved with the increased use of material is therefore limited.
A further known measure for increasing the service life consists in incorporating transverse reinforcements made of textile or metal materials. The latter have to join to the rubber well and permit the required trough properties of the conveyor belt. The aim of the transverse reinforcement is to cushion high inputs of energy from the falling material in that it absorbs forces itself, distributes the stresses and thus prevents direct penetration onto the tension support layer. Above all, it prevents those longitudinal cuts which may lead to steel cables fanning out. However, this measure does not make it possible to exclude the risk of notches and cuts being formed.
It is furthermore known, in order to increase the service life of belt cover plates, to introduce fibers into the cover plate material. In order that differing properties of the cover plate in the longitudina
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Bender Hans Uwe
Koch Hans Joachim
Schwambach Dana
Contitech Transportbandsysteme GmbH
Rao Deepak
Shah Mukund J.
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