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Features

HDPE

H.P.D.E was chosen as the best material suited for the roller drum, after extensive testing was done with other materials.

  • The absolute non-corrosiveness
  • The resistance to ultra violet rays
  • The high resistance to wear
  • HDPE is a very manufacturing friendly material. Despite a high resistance to wear it can be easily machined
  • The very low friction property
  • The in flammability of HDPE
  • The resistance to extremes of heat/cold
  • The fact that should the roller stop turning for any reason, the HDPE would effectively become a slide, with no damage to the belt.

Benefits

Is made from crack resistant High Density Polyethylene (HDPE) ensuring it can be used in a wide range of environments and is finished between centres to ensure superior outer shell concentricity to the roller shaft, eliminating vibration and enabling Standard idlers to meet weigh roller quality standards.

THICKNESS:

25 series- 14mm/ 19mm & (+ 3mm Steel Inner)

30 series- 19mm

40 series- 27mm

Heat resistant:Maintains constant operation at 110 deg C without failure and higher temperatures at shorter intervals.

Cold resistant:Maintains constant operation at freezing temperatures below zero.

Acid resistant:Constant exposure to reagent causes no damage.

Low Friction Co-efficient:The non-stick nature of HDPE lessens opportunity for build-up on idler.

Sealing Arrangement

“While bearing life is often used as an indicator of idler life it must be recognised that the effect of other variables especially seal effectiveness may be more important in determining idler life than the bearings.” C.E.M.A Standard No 502-1980.

THE REQUIREMENT WE ENVISAGED

The seal had to prevent the ingress of the following substances into the bearing:

  • Water
  • Fine Dust
  • Fine Dust
  • Any chemicals and/or acids
  • Grit
  • Slurry, mud

The seal would also have to be none-corrosive, have a very low co-efficient of friction and be resistant to chemicals, acid and wear.

THE RESULT

Our patented sealing arrangement consisting of a back seal or grease retainer a shock resisting bearing cover and outer seal consisting of four (4) contact lip seals proved to be the most effective sealing arrangement available on the market to date.

End user results proved the superiority of the EU-ROLLER sealing arrangement.

See references

Welded End Cap

Another important factor which influences the lifespan of the bearing is the bearing housing.

In conventional rollers the possibility of misalignment and distortion is ever present. EU-ROLLER therefore opted for a high impact nylon bearing cover, which is injection moulded to ensure precision.

This feature has, due to the design and material used, absorbed a large amount of the impact due to load and belt speed, which could otherwise be detrimental to the bearing.

The EU-ROLLER patent includes the heat fusion process used to permanently attach the bearing housing to the roller shell to form a totally sealed and aligned roller drum which is then precision machined to a concentricity specification of 0.2mm max.

This eliminates any extra shock loads to the bearings due to vibrations formed by non-concentric rollers, as is evident in conventional roller types.

Composite Structure

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Concentricity

The outer shell of the EU-Roller is machined between centres at the conclusion of the patented End cap welding process, ensuring concentricity of the finished shell. It is this process which enables our roller shells to make the step to weigh roller quality with minimal change.

The typical roundness values of the EU-Roller are around 0.2mm meanwhile the equivalent size steel rollers are often in the range of 0.8 to 1.2mm. The resulting balances for the EU-Roller are 2g unbalance and equivalent steel 11g unbalance.

Bearings and Lubrication

The selection of the bearing type to be used was made after extensive research was done into the vast range available and also after extensive testing with types which are used by other roller manufactures.

Eventually the decision was based on factors which would complement the roller design, to maximise the life span of our rollers in any conditions.
Achieving the expected L-10 Life of the bearing by using various design methods, such as nylon bearing races and technologically advanced material to protect the bearing.

Obviously, the theoretical lifespan of any conveyor roller bearing is dependent on various circumstances, not least being the lubrication of such bearing.

The ideal situation would be to have a maintenance program which would include regular greasing of these bearings, an almost impossible task if the number of rollers on any plant is taken into consideration and a situation where minimal or no control can be assured, thereby creating a problem which would not be controllable.

Material

The EU-Roller shafts are solid shafts, manufactured from bright drawn steel bar complying with the requirements of BS 970 grade 070 M20 (EN 3A).

The shaft ends have form and shape as required by International standards or customer specification
Holes and threads for Garland Assemblies and belt training rollers are an available machining option
Stainless Steel Shafts are available upon request.