Contact Mechanical Properties Analysis Of The Transmission Structure With The Belt

Pipe belt conveyor is a new kind of environmental protection and efficient bulk material conveying equipment,it is widely used in metallurgy,mining,chemical industry,electric power,building materials,ports and other bulk material conveying system.Its transmission structure mainly includes the driving drum and the rollers.The driving drum as power transmission components,it bears the full driving load and pressure load of the belt.Roller as the largest number of components,it forces belt wrapped into round tube in operation to conveying the materials.The transfer efficiency and conveyor belt force are affected by contact condition of the driving drum and rollers with the belt,conveyor belt wear and service life is affected either,which will affects the reliability of the machine.First of all,taking the typical key transmission structure part driving drum as an example,analyzing the force based on the finite element thought,static and dynamic finite element models are set up respectively of cylindrical,drum type,concave type,three different models driving drum structure,the stress distribution and deformation are analyzed.The analysis results show that the stress of driving drum mainly distributed in the middle of the barrel,the connected region of the radial plate and barrel,the contact point and separation point corresponding area on the wheel disk,the middle area deformation of the driving drum is the largest.When there is residual unbalance in the cylinder middle position,the vibration displacement and bearing transfer dynamic load increases with speed as exponential function.By comparing the mechanical properties of three kinds structure driving drum,it is concluded that the concave type driving drum mechanical performance better.Then,analyzing the force of roller which is the largest number transmission structure parts of pipe belt conveyor,finding out the influence factors of different location roller contact force,the coupled dynamics model that considering the circular tube elasticity is set up,different location roller contact force change rules are analyzed in constant speed and uniform acceleration two typical conditions,comparing with the analysis results of rigid dynamic model without considering the circular tube elasticity.The results shows that the contact force of the roller in the upper is equal to the reaction force of conveyor belt forming force,it is mainly related with the conveyor belt elasticity coefficient,surface glue thickness and pipe diameter.The contact force of three lower roller is equal to the sum of reaction force of the conveyor belt forming force and each conveyor gravity weight component,it is not only related to the factors affecting the forming force,but also affected by the unit quality of conveyor belt and roller spacing.Considering the conveyor belt elasticity,the roller contact force average value reduced approximately 80%,the fluctuating value increases more than four times.In constant speed,There was a "rush" phenomenon in the process of reaching to the peak,it changed a bit slow in the process of reaching to the minimum value,it was the larger alternating load.The contact force average and fluctuation value were bigger than any other rollers.In the uniform acceleration,there appeared "shock" phenomenon as the speed increased.Finally,the dynamic contact force simulation test bench of pipe belt conveyor and roller groups is design and set up,the contact force of roller in constant speed is tested and analyzed,the results show that the contact force change forms are consistent with the coupled dynamic model simulation results,the coupled dynamics model analysis results is verified.