The Design Of Logarithmic Spiral Surface Wedge Block Backstop And Dynamic Simulation

ABSTRACT: At present, the belt conveyors which has lower transportation cost,stronger transport ability and more simple maintenance is widely used in continuousconveying of the loose material, and it is popularized in the coal, mining, metallurgy, portsand other industries. The backstops need to be set up in all the up inclined belt conveyorswhose angle is bigger than4degrees, and it is the essential safety device for the upcontinuous transportation equipment and the important guarantee for the equipment to runsafely.Now the backstop with the eccentric circular arc surface wedge block is always used,which has the prominent advantages of compact structure, less weight, sensitive andreliable action. But it also has some weakness, the contact surface is small, so the contactstress is big and the wear extent is large between the wedge block and housing washer orinside track. When the wear extent reaches a certain degree, a small mesa will be formedin the wedge contact surface, thus affecting the reliability, stability and service life of thebackstop’s working performance.According to the weakness of the backstop with the eccentric circular arc surfacewedge block, based on the fixed Angle characteristics of the logarithmic spiral line, thispaper points out a new contact backstop with logarithmic spiral surface wedge block.Based on the existing eccentric circle surface wedge block, the logarithmic spiral surfacewedge block is designed in the MATLAB software through the curve fitting method. Thispaper uses the Pro/ENGINEER software to establish the simulation model of the backstopwith the eccentric circular arc surface wedge block. Then the three-dimensional model isimported into ANSYS/LS-DYNA software for dynamic simulation analysis to obtain thestress characteristics during the backstop process. By comparing the contact stress of thetwo wedge block backstop, results show that the new backstop has much smaller stress,smoother process and better performance than the traditional backstop with eccentriccircle surface wedge block, which will offer theoretical basis for the production of thenew backstop with logarithmic spiral surface wedge block.