Abstract
The paper considers the method of computer simulation of the stress-strain state of the drive drum shell in the NASTRAN integrated environment. Due to the complexity of determining stresses and deformations in the drum sections by the analytical method, it is proposed to solve this important problem using the numerical finite-element method. At the preliminary stage of computer modeling, a mechanical design scheme was developed, including a variable pressure that changes depending on the angle of rotation of the drum, the deterministic relations describing the variable force factors are based on the Euler ratio. It is also proposed to take into account the pressure from the variable friction force, which depends on the changing coefficient of adhesion of the belt to the drum. As a result of the computer calculation, the equivalent Mises stresses of 65 MPa were determined, the safety factor was 4.2 and the components of the tangential stresses were determined using the stress tensor marker, the shear stress reached the level τ=16 MPa for fabric tape and τ=3.14 MPa for rubber tape. According to the results of the calculation, the dependence of the tangential stresses on the angle of rotation of the drum was constructed. A diagram of the change in the component of tangential stresses along the forming shell of the drum was constructed. Analysis of stress-strain state allowed us to determine the factor of safety of the drum shell. Based on the analysis of equivalent stresses, it is proposed to further calculate the durability of the drum using the method of long-term fatigue. The computer calculation of shear stresses in the component allows choosing the rational parameters of the lining, based on such indicators as peel strength and break, as well as determining the angle 61° of the slab lining required to improve the reliability and traction ability of the pipeline
Highlights
Belt conveyors are widely used in mining enterprises, as the introduction of in-line technology in mines, pits and quarries increases the technical level and efficiency of mining production
The aim of this study is to develop a computer methodology for assessing the stress-strain state of the drum for further recommendations on the choice of the method for calculating the durability of the drum and the selection of lining parameters
Colored isolines indicate the occurrence of maximum stresses in the area of the drum landing on the shaft, here the maximum stresses reach σmax=65 MPa
Summary
Belt conveyors are widely used in mining enterprises, as the introduction of in-line technology in mines, pits and quarries increases the technical level and efficiency of mining production. The modern development of conveyor transport is characterized by an increase in its productivity and the length of transportation, which increases the load on the drive and deflection drums, as well as the number of drums in the conveyor This reduces the overall reliability of the conveyors and worsens the technical and economic performance of their work. In order to meet the needs for replacing failed drums, it is necessary to find ways to increase the production of drums, as well as to use them more efficiently The complexity of this task requires finding ways to further improve the design, calculation methods, and increase the reliability and durability of belt conveyor drums. The scientific task of creating a computer model for calculating the stress-strain state of belt conveyor drums to reduce their metal consumption and increase their durability and reliability is relevant
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