All Interroll uncoated steel and zinc-plated shafts are manufactured from cold drawn steel.
Zinc-plated shafts are cut from galvanized zinc-plated rod material, thus the front faces of the female threaded or spring-loaded shafts are always without zinc plating. Zinc
plated male threaded or flatted shafts with a diameter of 17 mm or more are only zinc-plated as a component after machining. Male threaded or flatted shafts with smaller shaft
cross-sections are not zinc-plated but rather manufactured from stainless steel.
All shafts are sawn and milled to ensure that the shaft ends are perfect. This avoid problems when fitting the shafts or from deformed shaft ends caused by trimming the shafts
with cutters.
With threaded holes, the centering holes are drilled in a first step to ensure the precise centering of the threaded hole in the shaft.
Frame Profiles, Hole Dimensions and Shaft Selection
The following should be considered in relation to the selection of a shaft and construction of the frame profiles:
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The hole dimension of the frame profile should be as small as possible on rollers with female threaded shafts to minimise the height difference of the conveyor rollers. This
enhances the operation of the roller conveyor.
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With aluminium profiles, female threaded shafts with as large a diameter as possible and as small a thread as possible should be selected. This minimises the risk of the shaft
penetrating the aluminium profile.
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On conveyor rollers with spring-loaded shafts, it must be ensured when drilling the profile hole that the conveyor rollers will, by necessity, have to be fitted diagonally. Too
small a hole could make installation significantly more difficult.
Standard Shaft Versions
Spring-loaded shaft
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Conveyor rollers with spring-loaded shafts are the simplest version of shaft and are extremely quick to fit and remove. Suitable crosslinks have to be provided between the frame
profiles to reinforce the conveyor.
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Female threaded shaft
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Compared with spring-loaded shafts, female threaded shafts have a very stable frame construction and are significantly quieter than loosely assembled conveyor rollers. The roller
shafts and profiles stabilise each other resulting in the conveyor rollers having a greater load capacity than loosely fitted rollers. These shafts take longer to fit and remove
than spring-loaded shafts.
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Shafts with shaft shuttle
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The spring-loaded, tapered shaft shuttle combines the advantages of spring-loaded and female threaded shafts:
quick to fit and a very low noise level.
The shaft shuttle permits the roller to be fitted free of play into conveyor profiles with 11 mm (+0.3 / 0.8 mm) hexagonal holes. The maximum reference length is 1,000 mm and the
maximum load capacity is 350 N.
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Fits free of play, without wear and tear, in the profile (as with female threaded shafts)
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Minimal installation (as with spring-loaded shafts)
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Exceptionally low-noise operation
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Conductive material to discharge static charges
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Counter-aligned shuttles
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Both shafts ends are pressed in
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Further Shaft Versions
Flatted shafts have lateral, parallel milled sections at the shaft ends, which fit into corresponding profiles, for example into profiles with open longitudinal holes. They are
therefore quicker to fit and remove but provide less stability than threaded shafts.
If corrosion protection is required, male threaded shafts and flatted shafts up to a diameter of 14 mm can be manufactured throughout from stainless steel material. The
alternative to this would be piece zinc-plating following mechanical machining to provide complete corrosion protection for the shaft. Interroll provides this alternative with
shafts above a diameter of 17 mm.
Shaft extensions
The following shaft versions for platforms 1100, 1200 and 1700 can be supplied with an extended shaft projection:
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Spring-loaded shaft
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Female threaded shaft
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Male threaded shaft
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Flatted shaft
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Axial support by the seal can no longer be guaranteed with a variableshaft projection. With greater axial forces, for example where there islateral displacement, suitable
replacement structures, such as spacingtubes, may possibly have to be fitted.
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