IJSRD - International Journal for Scientific Research & Development| Vol. 4, Issue 05, 2016 | ISSN (online): 2321-0613
Modifications in Drive System to Reduce Deflection of Sleepy Bar using ADAMS Pankaj Kulkarni1 Prof. G.E. Kodhalkar2 1,2 Department of Mechanical Engineering 1,2 APCOER, Pune Abstract— Drive system of a counter separator machine, in which slippery bar is subjected to numerous loading condition. About 90-95% of the total conveyor weight is preoccupied by the sleepy bar. Hence correct style of the drive system is extraordinarily important. In present paper work force analysis of the drive system for machine structure is done. In order to scale down deflection of the sliding bar, one of the choices is weight reduction and reduces force performing on it. However, the designer should be aware that so as to scale back the burden, the strength of the machine structure should not be disturbed. Sleepy bar is the most vital component used to move the conveyors from one location from one location to a different location application. The Drive mechanism in a drive system must conjointly carry the load of the cartons on conveyor. Key words: ADAMS, Drive system, FEA, Pulleys, timing belt I. INTRODUCTION Design of conveyor system includes belt speed, belt width, motor selection, belt specification, shaft diameter, pulley, gear box selection. The optimum belt speed, the determination of the belt width is largely a function of the quantity of conveyed material which is indicated by the design of conveyed belt [1]. Structural analysis is done on belt conveyor used in the high speed industrial automation and the maximum deformation induced in belt conveyor system in mm near the tail pulley side belt surface in which vertical forces are applied[2]. Authors also dealt with multibody formalisms and finite element modelling. The pulley was modelled as an elastic multibody system. Neglecting its own internal dynamics, the pair of rocker pins was modelled as one stiff mass less spring acting along the direction of shaft axis. The model was simulated under the conditions of a constant driver pulley speed and a constant driven pulley load torque. Dynamics of axially moving materials, belt drive mechanics, chain drive mechanics are the main studies are discussed [3]. A flat belt drive is designed by limiting the maximum tension. According to the permissible tensile stress specified for the belt material. Pulley material is generally cast iron or cast steel [4]. The impact analysis of the pre tensioning of timing belt is conducted for real timing belt drive [5].
III. POSSIBLE SOLUTIONS Possible solution to reduce weight of conveyor and machine /reduce deflection 1) Addition of no of sliding bars to distribute the weight of conveyor and reduce deflection but it will increase the weight of machine. 2) By doing changes in drive system – change in type belt, position runs Idlers, return idlers so that it will reduce weight and will transfer maximum force 3) By changes in conveyor design- conveyor mounting plate height and thickness can be reduced but it will reduce the strength of the machine and it is not correct solution considering shipping point of view. Out of these three solutions, second solution is feasible IV. PRIMARY FUNCTIONS OF SLEEPY BAR The main functions are: 1) To transfer motion of conveyor from along its length 2) To support the vertical mounting frames on the ends of it. 3) To compensate for change in length (as per the distance requirement of conveyors): The length of the sliding shaft must also be capable to support the machine structure as well as to guide the conveyor while matic motors operation starts. Distance changes between right conveyor and left conveyor are required as per the corrugated sheet size. It is located on lower side of the machine structure and is mounted on to main frames. To carry weight of both the conveyors it includes rollers , bolts ,nuts, pneumatic cylinders, pulley, timing belt, motion sensors, optical sensors (to detect the edge of corrugated sheet) sheet metal bracket , side guide, studs, square tubes, pneumatic cables, power supply cables etc. Sleepy bar is mounted on OS (operator side) side frame and OOS (opposite operator side) frames at lower side. Lower left conveyor assembly and lower right conveyor assembly is mounted is mounted on it. It provides platform for the conveyors to move along it. Weight of conveyors assembly includes conveyor plate, sheet metal bracket, sensors, belt drive, nut, bolts, studs, pneumatic cylinder, routing cables, Weight of cartons etc. causing bending of sliding bar.
II. PROBLEM STATEMENT It provides platform for the conveyors to move along it. Weight of conveyors assembly includes conveyor plate, sheet metal bracket, sensors, belt drive, nut, bolts, studs, pneumatic cylinder, routing cables, Weight of cartons etc. causing bending of sliding bar 1) To minimize deflection of sleepy bar -It carries weight of conveyor along its length 2) To reduce weight of the machine 3) To increase force transfer at the drive pulley.
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