Design And Experimental Research Of Micro-shoe Pressure And Its Experimental Device Based On ABAQUS

China’s social productivity and the demand for paper has been steadily increasing,which has promoted the sustainable development of the papermaking industry and further,boosted the technical optimization as well as the overall improvement of papermaking equipment.Especially in recent years,the domestic paper machine technology has made significant progress:the expanded width of produced paper and the increased operating speed.However,the increase in the speed of the paper machine puts forward higher requirements on the dewatering effect of its press section.Therefore,the shoe press,the best press form in the press section,stands out for its outstanding dewatering performance and wide paper applicability,including standard shoe press and micro shoe press.Among them,the standard shoe press is mostly directly imported from abroad as a part of the paper machine,which is mostly used in high-speed large paper machines.The micro shoe press is mainly used for the optimization of existing paper machines,thus improving the efficiency of the paper machine production line,which is frequently adopted by small and medium-sized papermaking companies.At the present optimization of the press section of the paper machine,the micro shoe press is a more economical and convenient choice.The standard shoe press exhibits higher line pressure,also has relatively larger and heavier press rolls,which demands for the transformation of the factory or even the setting-up a large hydraulic oil station.It not only means more space,but also asks for greater labor input,increasing the cost of transformation.In contrast,the micro-shoe press,easy to operate,completely avoids the above-mentioned problem,saving both time and energy.Therefore,this paper has carried out a numerical simulation on the shoe pressing roller and shoe plate of the micro shoe press based on ABAQUS software,by which we further independently designed an experimental device of the micro shoe press.Based on it,the physical experiment analysis were performed.The main work done in this paper is as follows:(1)The rationality of using standard shoe press to study micro shoe press was analyzed.By comparing the difference between the standard shoe press and the micro shoe press,the characteristics of each are summarized.The linear pressure of the standard shoe press is generally between 800 k N/m and 1300 k N/m,and the width of the shoe plate ranges from 200mm to 280 mm,while the linear pressure of the micro shoe press is lower,generally less than400k N/m,and the width of the shoe plate varies from 80 mm to 120mm.The differences between the two mainly lie in the size of the online pressure and the pressing width,but both are applicable to the press impulse theory.Therefore,the existing research on standard boot pressing can be used to provide some reference for the study of micro-boot pressing.(2)Used the finite element method,static analysis,thermal analysis and modal analysis were carried out on the micro shoe press pair roller with ABAQUS software.On the basis of satisfying its strength,the statics analysis found the maximum linear pressure that the micro shoe press pair roller of the selected size could bear,which laid the foundation for the following research on the micro shoe roller.The thermal analysis results showed that the deformation of the micro shoe press pair roller was mainly caused by the linear pressure and its own gravity,and it is less affected by the thermal stress.The modal analysis showed that the working frequency of the micro shoe press pair roller was far away from its natural frequency and no resonance occured.(3)Analyzed the performance characteristics of the shoe plate of different materials through ABAQUS software,we determined that the best material of the mini-shoe pressing roller shoe plate was Q235.According to the actual application in the papermaking,Q345D,duralumin and Q235 were selected for the later static analysis,thermal analysis and modal analysis.The analysis results showed that the shoe plates made of the three materials all met the working strength requirements under the maximum linear pressure.Because the material properties of Q345D can withstand greater linear pressure,it is suitable for making standard shoe press.Though with the largest deformation,hard aluminum alloy has the best thermal conductivity,avoiding the excessive local deformation caused by excessive temperature,which is suitable for use in an environment with uneven heat dissipation.Q235,meeting the requirements of working strength as well as having the lowest cost,the most cost-effective,is the three materials to make shoe plates of micro shoe press rollers the best material.(4)Based on the above-mentioned finite element analysis of the micro shoe pressing pair roller and shoe plate,we firstly designed a micro shoe pressing experiment device independently through Auto-CAD software,and checked its strength,whose working state was simulated by Creo software.After improvements based on the simulation results,an actual prototype was made.(5)Used aramid and conifer pulp as raw materials,paper with a quantitative ratio of 100g/m~2was copied,and the dehydration effect of two dehydrated methods on different types of paper was explored by using the self-designed experimental platform to dehydrate it with micro shoe press and ordinary press.The results show that under the influence of micro shoe press,the dehydration rate of both kinds of paper is about 1%higher than that of ordinary press,and the shoe plate made of Q235 material meets the requirements of micro shoe press with little line pressure.