Pouch conveyor drive system dynamics
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Pouch conveyor drive system dynamics P. W. Robinson J. Guo
. C. A. Wheeler
. V. K. Agarwal
. W. J. Srinivas .
Received: 26 September 2019 / Accepted: 18 August 2020 Springer Nature B.V. 2020
Abstract Pouch conveyors commonly employ point-contact drive systems, indenting a rigid drive wheel into the viscoelastic running surface of the conveyor. Rigid indentation of a viscoelastic surface exhibits regions of stick and slip, reducing the tractive limits of the contact. By modelling the conveyor cover as both an elastic material, and using a 3-parameter Maxwell approximation, a comparison can be made to predict the attainable traction of both indentation and load dependent contacts, highlighting the influence of viscoelasticity in the drive contact. Accurate prediction of the slip within the contact region allows appropriate drive placement and spacing along a conveyor, maximising transmission of drive power and efficiency, while minimising capital/operating cost and surface wear. Experimental results are presented to validate the model, using both polished steel and wheels with polyurethane, ceramic and rubber lagging. Keywords Belt conveying Pouch conveying Tribology Drive system Mechanical engineering
P. W. Robinson (&) C. A. Wheeler J. Guo Centre for Bulk Solids and Particulate Technologies, The University of Newcastle, Callaghan, Australia e-mail: [email protected] V. K. Agarwal W. J. Srinivas Indian Institute of Technology (IIT) Delhi, New Delhi, India
1 Introduction A conveyor system generates traction through a friction-based contact between a drive pulley and a viscoelastic conveyor belt. Conventionally, the belt is wrapped around a large drive pulley, with the belt tension generating the required normal force for traction. In addition to this, troughed installations will typically locate a counterweight system immediately adjacent to the drive system. This allows the return side (slack-side) tension to be maintained at the required tension, preventing slip in the drive (DIN 22101 2011). A typical configuration of a conventional drive system is depicted below. The tight side tension (F1) is governed by the load and friction in the system, whereas the slack side tension (F2) is typically adjusted through the use of a counterweight. The difference between these two, known as the effective tension (Fu), represents the force required to make the system move. For this configuration, this force can typically be achieved by using specialty lagging on the surface of the pulley or increasing the angle of wrap around the pulley through the use of snub pulleys (Fig. 1). Pouch conveyors differ from troughed systems in that they are formed by enclosing a specifically designed flat belt into a tear-drop cross-section. Typically, these will be utilised to convey fine powders, as they present less environmental risk, and have the ability to negotiate tight radius bends, or steep
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Fig. 1 Drive system configuration
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