Metal conveyor belts play a fundamental role in modern durable conveyor chain systems. Its open mesh geometry allows for the circulation of air or gas in addition to providing easy drainage of washing or manufacturing liquids. Its structure is also suitable for drying purposes, e.g. pasta or other food products.
IMPIANTI DI WASHING PLANTS
The main properties of these belts realized in different shapes and with different wires and straps, are: great reliability in the long run with a tested wear resistance and great capability to work at high temperatures (up to 1200°C), in presence of strong mechanical stress, in aggressive environment too and in presence of process slipping lubricants.
Conveyor belts in stainless steel or in carbon steel are usually important components in plants for horizontal handling of goods and are widely employed in fields like metallurgical, mechanical, food, chemical, pharmaceutical industries and also in ceramics and glass industry.
Types of conveyor belts
Edges of belts
Generally the conveyor belts produced by us (except the G.R. type which is exclusively driven by toothed cog wheels), are mounted on two drums, one of which is fixed for traction and the other is idle, movable for the adjustment (see picture). It is advisable to employ drums without side flanges; in some particular cases, the belts can be mounted on chains. In order to get a long life, it is indispensable to mount the belts correctly.
As far as the drums are concerned, their diameter must be as large as possible (since the driving takes place by friction in the point of contact of the driving roll), and at any rate not lower than 10 times the toggle pitch. Should slipping of the belt on the drum occur, this may generally be obviated through the following expediencies (these can also be combined): – increase, if possible, the diameter of the driving drum – coat the drum with material having an higher friction coefficient (e.g. rubber, knurling, …) – increase the winding arc of the belt around the driving drum by employing an additional roll (see picture)
To support the conveyor belt and for cases when the speed of the plants is low, the belt can be supported by fixed angular planes, coated possibly with a low coefficient of friction (anti-wear) material; it can be metallic (iron, steel, manganese) for applications at high temperatures, or plastic (Polizene® for temperatures up to 70 ° C, PTFE up to 200 ° C). The planes can be positioned parallel to the length of the belt (see picture).
If the foremost need is flatness and weight to be transported, it is necessary to have angular planes positioned in a “fishbone” pattern, proportioning the distances of the planes according to the weight and size of the material to be transported (see picture).
If the weight and the flatness are predominant factors, it is necessary to use support rollers (see picture). (vedi figura)