| Roller type belt conveyor is commonly used in most fields.While roller and belt’s contact leads to a lot of energy consumption from their friction,pressure depression,bending and roller rotation resistance,which not only limit conveyor belt’s speed,carrying capacity,but also make conveyor integrated operational costs too high.Based on this,a kind of steel wheel-rail belt conveyor was designed,with the characteristics of low friction and high speed of steel wheel-rail walking system This new belt conveyor system can make carrying speed of conveyor belt greatly promoted,meanwhile,the structure size of the whole conveying system is reduced and the transport efficiency has also been increased.In other words,the conveying system is more energy-saving with low operational cost.The main contents and conclusions of this dissertation are as follows:(1)The structure of the key parts of the wheel-rail belt conveyor is designed:the bracket is designed on the belt.The crossbeam of the bracket directly sticks to the belt’s upper covering layer,and the two end sides of the bracket directly wear out through belt’s upper layer to bottom layer.The pair of steel wheels are articulated to the both ends of bracket with the bearings and other components.Thus,the steel wheel and rail contact to roll.Besides,spring steel plates are designed and added on both sides of the belt following the belt width direction.And the two sides of spring steel plates are designed as obtuse angle,and the longer side sticks to belt’s bottom layer,while,the other side are fastened to one side of bracket.As to the drum,two grooves are chiseled in it so as to match the steel wheels’ getting through.(2)The transportation process,work.ing resistance and materials’ discharging trajectory are analyzed.When working,the friction between the conveyor belt and the drum surface is seemed as the driving force to drag steel wheels rolling forward along the rail.During this rolling process,wheel hub and rail tread contact,meanwhile,the flange of wheel tends to contact the inner side of rail,aiming at guiding and anti-derailment.The working resistance in conveying process mainly includes the bending resistance of material flow and the friction resistance of wheel-rail contact rolling,which is much smaller than the operational resistance of common belt conveyor.Material trajectory is similar to parabola.(3)With the help of ANSYS simulation software,the structural static and prestressed modal characteristics were analyzed.The simulation analysis shows that the total deformation of the conveyor belt and the steel rail with load is minimal,thus the design&structure selection is reasonable.As to the spring steel,one side is fixed,and the other is rotated from 120° to 90°,in the rotation process,the maximum stress is always showed in the intersection of both sides of the spring steel,which indicates that it’s easy to be broken or destroyed at the intersection,therefore the intersection of both sides must be optimized to round corners and widened as well.Next,the modal analysis of conveyor belt,steel wheel and rail shows that there is no possibility of resonance among them when loaded normally.(4)The steel wheel-rail belt conveyor prototype is trial manufactured and tested.Test indicators are wheel-rail operation stability,the state of conveyor belt when getting through the drum,the conveyor belt sagging length,whether the conveyor belt running bias and whether materials scatter from the belt when working.The test results show that the overall working state of the conveyor system is good and stable,but the installation accuracy of the structure near the drum needs to be further improved. |
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