Finite Element Analysis Of Strength Of Compound Pendulum Jaw Crusher

In recent years, the rapid development of coal industry in China has resulted in a growing increase in the demand of mining machinery. Compound pendulum jaw crusher, as a kind of common used mining machinery, has been widely applied in metallurgy, chemical industry as well as mining with its own distinguished advantages of simple structure, high reliability and excellent performance. So far, most domestic manufacturers use the way of experience analogy to fulfill the design of compound pendulum jaw crusher. However, this way not only makes it hard to ensure the strength and stiffness, but also leads to a waste of materials. So all above, the idea of using the finite element method to take the place of the traditional way of experience analogy to accomplish the design of compound pendulum jaw crusher will surely play an important role in improving the crushers’overall performance and domestic production levels, as well as enhancing the competitiveness of enterprise products.This paper which is based on the compound pendulum jaw crusher PE1300×1500, will illustrates its main ideas as follows:(1) Simplify the compound pendulum jaw crusher as a four-bar linkage to make it easier for kinematic analysis with the purpose of getting the law of motion at any point of moving jaw. On this basis, relative calculation and analysis has been done to study the trajectory of feed port, discharge opening and centroid. Furthermore, static analysis of the above simplified four-bar linkage has been performed to get the force relations between different parts of a crusher under any working conditions.(2) Come up with a new way which is based on the velocity to calculate the distribution of crushing force on the movable jaw plate as well as the magnitude and position of composition of crushing forces at different time in a cycle. On this basis, the analysis of force conditions of different parts of a crusher under five working conditions has been carried out to form the solid basement of strength analysis in a crusher.(3)Use the APDL command in the software ANSYS to build the parametric model for the moving jaw and the framework of a compound pendulum jaw crusher separately. Also throw light upon the relative techniques during the modeling procedure such as the simplification of the model, the choosing of key parameters, the connection between adjacent parts, and also the way of applying loads and constraints. What’s more, perform a confidence analysis for the so built finite element model. With a reasonable layout for the model, not only the relationship between the moving jaw and the framework has been built up, but also the loading modes of the constraints and loads have been improved, which makes it more reliable for the finite element analysis of the strength of compound pendulum jaw crusher.(4) Based on the finite element model of moving jaw and the framework, the finite element static analysis has been done to get the stress distribution under five working conditions when the crushing force reaches its peak, so as to make sure the dangerous working conditions. On the basis of maintaining its weight decreased slightly, the structural improvement and optimal design have been done considering the most dangerous working conditions to reduce the maximum stress from162.981MPa to114.095MPa in the moving jaw and also reduce the maximum stress from320.303MPa to134.544MPa in the framework, which greatly improve the mechanical properties to guarantee the strength demand for safety work.