Research on selective crushing characteristics of new tooth plates for jaw crushers

Abstract Existing studies have insufficiently explored the influence of jaw crusher tooth plate structures, particularly tooth height differences, on crushing effects. They have not systematically analyzed how tooth height differences affect productivity, energy consumption, and particle size distribution, nor have they adequately studied the optimization of structural and operational parameters. To improve the productivity of jaw crushers, reduce energy consumption, and optimize the output particle size distribution, this study proposes a tooth plate structural feature based on tooth height differences (0∼10 mm). It simulates the crushing process through a coupled simulation of the discrete element method (DEM) and multi-body dynamics (MBD), and for the first time reveals a negative correlation between tooth height differences and crushing energy consumption. Additionally, combined with the response surface methodology, it analyzes the effects of tooth height differences, eccentric shaft speed, and crushing chamber nip angle, and conducts experimental verification using wolframite ore as the sample. The results show that the quadratic terms of tooth height difference, rotation speed, and nip angle have an extremely significant impact on productivity, while the interaction among the three factors is not significant. The degree of influence on productivity is as follows: tooth height difference > rotation speed > nip angle. Experimental verification indicates that when the tooth height difference increases from 0 mm to 10 mm, the proportion of wolframite ore in the −40 + 25 mm particle size fraction increases from 37.16% to 64.03%, the proportion in the −25 mm particle size fraction decreases from 47.99% to 13.53%, and the productivity increases by 30%.