Analysis On Impact Property Of Mining High Strength Ring Chain

High-intensity mining link chain is a main towing component in scraper conveyers and coal shearers. The dynamic character of the link chain plays a very important part in the reliable operation of the conveyer system. Because the link chain might be blocked during the conveyer operation, the impact property of the mining link chain was discussed and analyzed in this study.The basic technical scheme of the finite element dynamic analysis for mining link chain was established based on understanding the impact dynamic theory and explicit integral algorithm. Firstly, a finite element model of finished link chain was established, and the velocity, acceleration, maximum principal stress, Von Mises stress, shear stress, first principal strain and system energy of the finished chain were analyzed under a blocked situation. Secondly, a finite element model of link chain with V notch was established, and the velocity, acceleration, maximum principal stress, Von Mises stress, shear stress, first principal strain and system energy of the link chain with V notch were analyzed under the blocked situation. Finally, a finite element model of J-shape link chain in Izod impact test was established, and the maximum principal stress, Von Mises stress, shear stress and first principal strain of J-shape specimen under Izod impact test condition were analyzed. Especially, the maximum principal stress, Von Mises stress and Tresca stress in the notch area were detailedly analyzed in this study.The results shows that the crack would be initiated and propagated from the inner part of the V notch area for the link chain with V notch, and the crack would be initiated and propagated from the two sides of the bottom in the V notch area in Izod impact test with J-shape specimen. The results would provide a theoretical basis for the link chain optimized design and experimental study.