Helix Technologies Pty Ltd
ABN 67 269 614 528
PO Box 610, Morley WA 6943
22 Donna St, Morley WA 6062
tel +61 8 9275 0635
Conveyor Design, Conveyor Dynamic Analysis, Belt Conveyors, DEM Chute Design,
Discrete Element Method Transfer Chute Design, Particle Flow, Pipe Network Analysis, Piping System Design, Pump Selection Software, Pulleys, Vee Drives.
transportador, correia, roletes.
Helix delta-T6 Calculation Methods
Helix delta-T6 has
three main methods for calculating conveyors:
5048 is the International Standard method and is closely related to the German
DIN 22101 Standard. The Helix delta-T program follows the requirements of this
standard with the addition of an automatic friction factor estimation based on
belt sag. This f factor estimation has been successfully used to design and
build many hundreds of conveyors.
The CEMA (Conveyor
Equipment Manufacturers Association) methed uses the methods and formulae
detailed in the CEMA manual.
The VISCO method in
the delta-T program uses the conveyor belt Rubber properties to calculate the
belt - roller indentation and combines this with the material and belt flexure
losses and idler drag and scuffing resistance to accurately calculate the
friction factor of the conveyor. This method is a very accurate method of
calculating conveyors as it takes into account the actual rubber properties of
the belt to calculate the friction factor. This method allows the user to design
conveyors which utilise the latest technology including the Low Resistance
Rubber belts made by leading manuficturers around the world.
Indentation resistance is caused by the idler roll pressing into the
relatively soft belt cover rubber. It is intuitively apparent that the more the
penetration of the idler roll into the belt cover, the more resistance there is
likely to be. Many people have researched this subject and names such as
Jonkers, Spaans, Hager, Lodewijks and Wheeler come to mind. From this
research it is evident that the main factors which affect the indentation
resistance are the actual rubber properties of the belt cover, the diameter of
the idler rolls and the load on the idler roll, which for a fixed tonnage and
belt speed is dependent on the idler spacing.
Jonkers developed the following formula for the Indentation resistance
Typical makeup of the friction of a long overland conveyor
With delta-T it is very
easy to compare the different methods - simply build your conveyor model and the
press the ISO, CEMA and VISCO buttons to compare the results.
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