Investigation On Materials’ Breakage Behavior In Jaw Crushers Based-on DEM

Jaw crusher is a common mining machinery, it’s commonly used in the original ore crushing process, and the history of the equipment is more than a hundred years. There’re variety views in the research of jaw crusher, thanks to many generations of engineers, this equipment has developed from a initial bulky, low efficiency and poor reliability machinery to a machinery with new novel appearance, high efficiency, and are more stable and reliable.Although jaw crusher has a long history, but the specific material crushing behavior research in a jaw crusher has always been a difficult problem, main reasons are the working environment is extremely odious, and the speed of materials after broken is too big, etc. With the development of numerical method and computer technology, realization of materials’crushing process to computer simulation has become possible. There’re multiple calculation method of rock’s simulation, including particle discrete element method, which can simulate the behavior of rocks’failure very well, so the discrete element method is used to research the materials’crushing behavior. Combine the discrete element method with the research of materials’breakage behavior in a jaw crusher is a relatively new topic, and it has important practical significance. Through the research of materials’concrete behavior in the crushing cavity during a crushing process can guide the design and improvement of the jaw crusher. In this paper, the main work content is as follows:(1) Material model was established using PFC3D software, simulated the jaw crusher common materials such as limestone and marble. In order to ensure the material model is consistent with the real rock mechanics properties, simulation of uniaxial compression test has carried on the material model, thus obtained the stress-strain curve and the strain on both sides-axial strain curve of both model. Through these curves, materials’elastic modulus, compressive strength and poisson’s ratio can be obtained.(2) Jaw crusher’s Pro/E model was obtained by mapping a jaw crusher used in a laboratory. Established a jaw crusher crushing cavity model in PFC3D based on the Pro-E model. Crushing cavity is the place where materials breaks, it includes the moving jaw and the fixed jaw, two jaws’ extrusion can cause materials’breakage behavior. Simulated single toggle jaw crusher model and double toggle jaw crusher model, then used the above two models to simulate crushing limestone and marble material model respectively, thus we got the four groups of moving jaw’s work data.(3) There’re force chain network existing inside the material model, in the process of broken simulation, the force chain network changes. With the change of force chain network as a starting point, this paper introduced the concrete broken process. By tracing particles, we can observe the moving direction of the material model after broken in specific state.In this paper, the discrete element method was applied for the research of material’s breakage behavior in jaw crushers, and this is a new idea for the study of jaw crushers. Using PFC3D software carried on the simulation of material model’s crushing process, proved the feasibility of discrete element method to simulate rock and other materials. Through the simulated crushing process in PFC3D, the moving jaw work detailed data was obtained, through the data can found that the moving jaw’s work shows a steadily stair-shape increase along with crushing process. Then recorded the material models’ behavior in the crushing process, and studied the movement of material models’ particles. This paper has certain reference values for jaw crusher related research.