Torque in a spiral conveyor : calculation model in Excel

Bosman, R. (2012) Torque in a spiral conveyor : calculation model in Excel.

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Abstract:A model is set up to determine the required torque and power of a spiral conveyor. The required torque and power for an ascending and descending spiral conveyor with the motor attached in the top is calculated. The model is made in the Microsoft Office program Excel to calculate forces for a ascending as well for a descending conveyor. The torque is dependent on many parameters. The most important parameters are conveyor height, diameter, number of windings, product dimensions and product weight. Friction is very important for the determination of the required torque. Friction forces can be the cause of more than 60% of the required torque. The friction coe�cient appears to be dependent on force, speed and temperature. A function is set up to take these parameters in account. At increasing force and temperature the friction coefficient becomes less, at increasing speed the coefficient becomes higher. The force dependent friction coefficient becomes less because of the use of steel bearings on a polymer rail where the ploughing effect is negligible. At higher temperatures oil viscosity becomes lower and the poly urethane rail is more exible through which friction becomes less. The coefficient is set on conveyor tests and not measured. Equations are set up with the Newtonian approach. Basically two types of forces are present in the conveyor: friction- and gravitational forces. The spiral component and vertical retour section component are mostly responsible for the required torque. Radial forces in the spiral have major influence for larger configurations. In small configurations this force is relatively small. The results from the model are compared with torque tests. The model gives a maximum deviation of 20 Nm. This deviation is acceptable because of the many items which have influence on the required torque. The required torque behaves as parabolic by increasing windings.
Item Type:Internship Report (Master)
Apollo BV, Coevorden, the Netherlands
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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