Research On Contact Force Between Conveyor Belt And Roller In Turning Section Of Pipe Belt Conveyor

The pipe belt conveyor is a new type of special belt conveyor developed on the basis of the general belt conveyor.With the common hexagonal arrangement of supporting rollers and with the help of pressing rollers the belt can be rolled into a circular tube.Thus it achieves the closed conveying of bulk materials.Because the idler is the most components,the contact conditions between the roller and the conveyor belt can affect the transmission efficiency,the stress of the convey belt,the wear and service life of the belt.The pipe belt conveyor can realize the turning in a smaller radius in the space,which determines the special characteristics in the curved section,and especially the contact force at its bends is more complicated,which can also indirectly affect the reliability of the whole set of equipment.In this dissertation,the author analyzes the structure,the type selection and design rulers..The finite element simulation and experimental test are used to analyze the influence of different initial tension on the contact force of the roller,and the influence of different turning radius on the stress of the pipe conveyor.Finally,the dynamic contact force between the idler and the conveyor belt of different turning sections is studied.This study can provide reference for the optimization design of the roller arrangement,reduce the wear of the conveyor belt and the idler,and improve their service life.It also reduce the cost and improve the economic efficiency and reduce the energy consumption and select the appropriate turning radius to improve the reliability of the pipe belt conveyor.The main research of this dissertation is as follows:(1)The structure and arrangement of the idler and the selection methods of important parameters were analyzed,and the formulas for calculating the static and dynamic loads of the idler were deduced.On the basis of these formulas,the relationship between the diameter of the idler and the belt speed and bandwidth was explored.Finally,the influencing factors of the idler spacing were analyzed to select the type and phase of the idler.The design of the parameters provided a theoretical basis.(2)In this dissertation,the author analyzed that the relationship between the contact force of each roller and the tension of the conveyor belt in the hexagonal idler group.And by establishing the finite element model of the conveyor belt and the idler,it was also concluded that the initial tension of the conveyor belt had influences on the contact force of the idler,which also was compared with the condition without tension.Finally,the maximum strain variation of the pipe conveyor belt under different turning radius was analyzed and Simulated.(3)The static contact force test experiment system of the tube conveyor-roller was built.It was found that in different initial tension conditions the static contact force can be changed by the different positions in the hexagonal roller group.And then,the test results were analyzedand compared with the simulation to obtain the static contact force variation of the roller at different positions under different initial tension conditions.(4)The dynamic contact force experiment system of idler was set up on the comprehensive test bench of two kinds of pipe belt conveyor with different pipeline shapes.The dynamic contact force between idler and conveyor belt was tested under different filling rate and running speed conditions.The dynamic contact force of each idler in the idler group under different working conditions was obtained.The changing trend and the testing results are compared and analyzed,and the changing law of the dynamic contact force of the roller at different positions in the roller group was concluded.