| China is a big paper using country.At present,there are two main types of paper calender rolls used in paper mills.The paper calender rolls used in the paper are mainly divided into two categories: oil heating and steam heating.In this thesis,the calendering efficiency of the current calender is low,there is pollution in the calendering process and there are safety hazards.Based on the principle of electromagnetic induction heating,the overall design of the calender structure,the finite element analysis method is used to analyze the heat flow coupling and electromagnetic coupling of the roller,and static and dynamic characteristics analysis,from the analysis results show that the electromagnetic induction heating method of calender meets the calendering technical requirements of materials such as leather and non-woven fabric;and further designed and manufactured a small experimental bench for electromagnetic induction heating calender.The electromagnetic temperature test is carried out,and the maximum influencing factors of the electromagnetic induction heating calender are obtained by single factor test,orthogonal test and analysis of variance.(1)Analysis of the oil heating calender.The oil heating calender was three-dimensionally modeled by SolidWorks,and the heat transfer coupling model of the oil heating calender model was analyzed by FLUENT software.The analysis of the simulated cloud image showed that the temperature distribution on the outer surface of the roller was nonuniform,and the heating temperature was only up to 200°C,it is verified by analysis that the temperature of the oil heating calender cannot meet the calendering technical requirements of polymer materials such as leather.(2)Determination of the heating scheme of the electromagnetic induction heating calender.Combined with the principle of electromagnetic induction heating,ANSYS Maxwell software is used to perform electromagnetic thermal coupling analysis on the induction coil.It is found that the electromagnetic induction heating temperature can reach above 400 °C,meeting the calendering technical requirements of leather and other polymer materials,determined the heating scheme of the electromagnetic induction heating calender;according to the determined heating scheme,the overall scheme of the calender and its key components are designed and analyzed.(3)Design and finite element analysis of the calender.According to the determined heating scheme,the overall structure of the calender was designed.The three-dimensional modeling of the calender was completed by SolidWorks.The static and dynamic characteristics of the drive shaft and the roller structure were analyzed by ANSYS software.It shows that the structural design of the calender meets the requirements under actual working conditions.(4)Calender electromagnetic heating temperature test.According to the overall structure of the calender,a small experimental bench of calender was designed and manufactured.Three variables of heating power,the distance between the workpiece and the heating cover and the speed were selected as the key influencing factors of the test,and the single factor test was carried out.According to the results obtained by the single factor test,the orthogonal test is designed.According to the results obtained by the orthogonal test and the variance analysis,the maximum influencing factors of the electromagnetic induction calender are obtained.adjusting the variables according to the calendering requirements of different materials can achieve the optimal calendering effect of the calender,and provide relevant data theory for the design of the electromagnetic induction heating calender. |
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