Abstract
Belt is costliest part of belt conveyor system. Sudden rise in belt tension within transient starting condition, results in belt failure and structure damage. It is difficult to measure these stresses by static calculation method and hence their presence might go undetected. Belt elongation is an evident quantity for these stresses. Dynamic belt stretch is formulated in terms of displacement response of conjugative belt units with respect to time. This paper presents analysis of the event and propagation of dynamic belt stretch for straight horizontal and straight inclined belt conveyor system. Dynamic behavior of belt system is investigated for starting condition of fully stacked conveyor belt. Belt conveyor system is considered as series of vibrating mass and its unit is assumed to be a viscoelastic segment. Equation of motion of belt unit is developed by Lagrange’s approach. Observed transient parameters are more vibrant in inclined belt than the horizontal belt system. Maximum value of dynamic belt stretch for horizontal belt systems founds 1.13% of total belt length and for inclined belt conveyor system, it is 1.16% of belt length. Both values are within range of standard value specified for fabric belt system.
Highlights
Starting of system at fully loaded belt becomes a worse condition for the belt because maximum belt stretch occurs at this stage
Transient variation in the speed is more in tail end segment of the conveyor belt and lesser variation as approaches to drive end
Failure of conveyor belt during transient starting is often case that occurs in belt conveyor system
Summary
Belt conveyor is most preferred bulk material transfer system It is employed in vast industries like mine, metal, power, food etc. Conveyor belt is most significant element and accounted 30%-50% of the overall conveyor system cost (CEMA, 1997). It is a key component of belt conveyor and affects overall performance of the entire system. Starting of system at fully loaded belt becomes a worse condition for the belt because maximum belt stretch occurs at this stage. This undue condition occurs during re-starting of system after any break down or power failure while in operation. According to conveyor belt manual, (Dunlop, 2016) fabric belt has maximum 2.0 % elongation during operation and this value is recommended for deciding stroke length of the take-up pulley
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