The properties of your material to be transported, your requirements as regards the conveyor system and the ambient conditions are the basis for the planning of your system.
Consider the following questions and the resulting conditions for selection of your product in order to find the best possible solution for your conveyor
installation.
Dimensions of Your Material to be Transported
What is the length and width of your material to be transported?
The length and width of the material to be transported have an effect on three factors:
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Straight running: The higher the ratio of length to width, the more stable will be the straight running of your items. With smaller length to width ratios, you may have to
consider putting in place additional measures to stabilise the straight running of the materials.
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Reference length: The reference length normally corresponds to the width of the product to be transported + 50 mm or, with very large items such as pallets + 100 mm.
Tapered conveyor rollers must be used in curves, the length of which has to be calculated separately.
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Roller pitch: To ensure that the material to be transported is conveyed smoothly, the roller pitch has to be designed so that at least three conveyor rollers lie under the
product at all times.
What is the height of the material to be transported?
The greater the height of the material to be transported in relation to its footprint, the higher is the risk of it tipping over when travelling on the conveyor. The following
must be taken into consideration:
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Minimise the roller pitch as much as possible to ensure that the products are conveyed smoothly with as large a base surface as possible on the conveyor.
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Avoid rapid acceleration and harsh braking.
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With inclined conveyor tracks, determine the centre of gravity of the material to be transported and check whether there is a risk of it tipping.
Weight of Your Materials to be Transported
What is the weight of your material to be transported?
The weight of the material to be transported affects in particular the:
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Diameter, pitch and bearing load: The weight of the material to be transported must be distributed over as many load-bearing conveyor rollers as are required to ensure that
the maximum load capacity of the individual rollers is not exceeded. This may mean that material to be transported may have to be supported by more than three conveyor rollers.
The greater the diameter of the tube selected, the higher is its load capacity. The load capacity is also increased by threaded shafts, which provide additional reinforcement for
the conveyor and act as cross ties.
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Drive: A wide range of different drives are available with Interroll products. However, these drives must fit to the application.
What is the weight distribution of the material to be transported?
Uneven weight distribution of the material to be transported?
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In principle the weight of the material to be transported/container should be distributed as evenly as possible. The more uneven is the weight distribution, the more difficult is
the reliable conveyance. With pallets, it should be borne in mind that only the rollers under the bulk of the pallet are actually bearing the load (euro-pallet). Thus the
proportion of load-bearing rollers when transporting pallets is generally restricted to a maximum of four rollers.
Material of Your Transported Product
What is the material of the goods to be transported?
The material, and especially the condition of the base, has an effect on the rolling and starting resistance:
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Drive, diameter and pitch: Rigid materials, such as polymer containers, have a lower rolling and starting resistance than soft materials, such as boxes. This has a direct
effect on the drive output required and must be incorporated into your calculation. The softer the underside of the material to be transported, the higher is the drive output
required for a product with the same weight but with a hard underside. Furthermore, in principle the softer the material to be transported is, the smaller the roller pitch
selected needs to be.
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Load capacity and pitch: Ribs, grooves, ridges or grooves on the base of the material to be transported are not a problem providing they run parallel to the conveyor
direction. The drive output required may have to be increased depending on their shape, especially with cross ribs. Cross ribs can have an adverse effect on the conveying action
and the roller pitch may possibly have to be calculated by experience.
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