Analysis of the influence of technical parameters of roll surface on milling power based on discrete unit method
At present,the domestic roller mill surface technical parameters on the impact of powder making research still needs to be improved,which is not conducive to the enterprise's reduction of consumption and increase efficiency.This paper launches the research on the influence of tooth roller tooth shape on pulveri-zing power.Firstly,the discrete element cell method was used to calibrate the bonding parameters of wheat to enhance the reliability of the simulation to simulate the crushing process of wheat.The discrete element cell method was used to firstly calibrate the parameters of wheat Bond model based on the Hertz-Mindlin with Bonding model,and design the Box-Behnken four-factor,three-level test to take the actual critical load as the response surface target.The optimal wheat particle bonding parameters were calibrated to lay a foun-dation for the subsequent tooth shape research.Based on the aforementioned calibration and previous re-search,a discrete element milling model of the grinding roll was established.The Box-Behnken five-factor and three-level response surface simulation tests were carried out for tooth angle,front angle,top width,number of teeth and tooth slope to study the effect of tooth shape parameters on milling power,and the re-gression equations between tooth shape parameters and power were obtained.The optimal parameters were calculated according to the regression equation:the normal stiffness per unit area was 3.61×109 N/m2,the tangential stiffness per unit area was 1×109 N/m2,the critical normal stress was 1×107 Pa,and the critical tangential stress was 1×108 Pa.The error rate of the discrete element simulation critical load and regression equation was 1.6%,which proved the reliability of the parameter calibration.This parameter provided a strong support for the subsequent establishment of wheat crushing model.The regression equation of the tooth parameters with the milling power as the response value was obtained,which provides theoretical sup-port for the subsequent tooth-related research,and after the experimental measurements were compared and analyzed with the simulation test,the trend of the simulation test power was the same as the trend of the measured power,and the relative error of the power was within 13.5%,which proved the reliability of the simulation analysis.The crushing model of wheat milling was established by discrete element method,which can realize the simulation of wheat crushing,and the effect of tooth parameters on milling effect was significant.The results of the research can provide a reference basis for the subsequent research on the effect of tooth parameters on milling and optimization of tooth shape.
toothed rollwheatmillingresponse surfacediscrete element
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