Study On Liner Shape Parameters For Jaw Crusher

Liner of jaw crusher is the effective part contacting with material directly to crush material. Severe impact and intense abrasion existing in the material compression result in that liner is the easiest part to wear and tear among crusher components. Liner shape affects product particle size distribution, crushing force and particle shape. These performances have direct relation with economic profit for enterprise. However, present study has no systemic knowledge in the effect of liner shape on crushing performance. It is significant to study liner shape systemically for strengthen crusher fundamental theory.This presentation deals with crushing force and liner contacting stress under different material status. Effect of parameters of liner shape under mono-factor and multi-factors condition was obtained. Optimized parameters group was got and verified through experiment. The main work includes:1. Crushing force and liner stress for single particle was analyzed using material mechanics and elastic mechanics method on both block and sphere particle. The method to calculate liner stress of multi-particles was proposed based on Coulomb-Mohr criterion.2. The knowledge on material crushing behavior will be richen by studying fracture and fragmentation mode of crushing process of single block particle under compression of liner. Effect of single liner shape parameter on crushing performance was obtained. Simulation results coincide with theoretical results.3. Simulative experiment program was determined by orthogonal experiment design method. Effect of multi-factor of tooth shape parameter on crushing force, liner stress and crushing result were studied using discrete element method. Relative coefficients were proposed. Results show tooth shape volume index has coincidence with crushing performance. The intuitive analysis show tooth base width affects synthetical index significantly, then is tooth shape angle. Optimized parameters group was obtained; Variance analysis show that tooth base width affects synthetical index significantly under level0.1. While tooth pitch and tooth shape angle also have influence. 4. Crush experiments of single particle and multi particle under different tooth shape were done. Results show that crushing forces of mono particle coincide with theoretical values thus verifying the reliability of theoretical model. Crushing forces of multi-particles has a good relationship with tooth shape volume index. This verifies the rationality of putting forward volume index and relative theoretical analysis.