Conveyors: power-driven – Conveyor section – Spiral
Patent
1992-02-26
1993-03-02
Olszewski, Robert P.
Conveyors: power-driven
Conveyor section
Spiral
198852, B65G 1706
Patent
active
051901439
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an endless conveyor belt for an air treatment plant in which the conveyor belt, over part of its length, travels in a helical path and comprises a bottom consisting of transverse rods and a wire netting, and side plates fixedly connected in pairs with two rods so as to form, together with these rods, a link which is movable relative to adjoining links about two axes perpendicular to the longitudinal direction of the belt and situated one in the plane of the bottom and the other perpendicular thereto.
Conveyor belts of this type are disclosed by e.g. SE, C, 8206760-4 and SE, C, 8506136-4. These conveyor belts are, furthermore, self-stacking, i.e. the side plates also serve as spacers, the upper edge portions of which are adapted to engage the lower edge portions of the overlying turn of the conveyor belt so as to support this turn.
In the known conveyor belts, the wire netting forming part of the bottom consists of zig-zag wires each enclosing two adjacent rods, each of which is enclosed by two such wires.
When the known belt travels around a curve about an axis which is perpendicular to both the longitudinal direction of the belt and the plane of the bottom, the zig-zag wires will be pushed into one another to an extent increasing progressively towards the inner side of the curve. This reduces the guiding effect of the rods on the zig-zag wires so that the zig-zag wires no longer form a completely flat supporting surface for the products carried on the bottom for air treatment, such as cooling, heating or drying.
An inconvenience in the process of manufacturing the known belt, and also when the belt is assembled, is that the zig-zag wires must be differently designed, depending on whether they enclose two rods belonging to the same link, or two rods belonging to different links.
The object of the present invention is, therefore, to provide a conveyor belt of the type mentioned in the introduction to this specification, in which the wire netting consists of but one type of zig-zag wires which, furthermore, form a completely flat supporting surface also when travelling around a curve.
According to the invention, this object is achieved in that the wire netting consists of zig-zag wires, each of which encloses not only the two rods of one link but also one adjacent rod of the adjoining link. Thus, every second rod in the conveyor belt is enclosed by two wires, while the remaining rods are enclosed by but one wire. Furthermore, the extension of the zig-zag wires in the longitudinal direction of the belt substantially corresponds to the relative displacement of two successive wires in the longitudinal direction of the belt.
Also, the ends of each wire may be fixed to one of the two rods of the associated link.
Most preferably, the ends of each wire are fixed to the central one of the three rods enclosed by said wire.
To further guide the wires, each wire may, between its ends and at at least one point, be fixed to one of the two rods of the associated link.
Advantageously, the conveyor belt may have side plates overlapping each other. More precisely, each side plate may have a section which overlaps the corresponding side plate of an adjoining link and has an elongate hole through which passes one rod of the adjoining link.
The invention can be applied to self-stacking as well as to non-self-stacking conveyor belts. In the first case, the side plates of the links may serve as spacers, the upper edge portions of which are adapted to support the links of an overlying turn in the helical part of the conveyor belt path.
Like in the above-mentioned known conveyor belts, the zig-zag wires in the conveyor belt according to the invention only serve to form a product-supporting surface and do not take up the tension in the belt caused by the pulling force applied to the moving belt. Instead, the pulling force is taken up via the side plates at at least one side of the belt.
The invention will be described in more detail below, reference being had to the accompanying drawings, in which
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Froderberg Ingemar
Rauer Jaan
Frigoscandia Food Process Systems Aktiebolag
Gastineau Cheryl L.
Olszewski Robert P.
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