Optimum Design And Application Of Double Conical Refiner With An Annual Output Of Three Million Tons

The refiner is a pulp&paper equipment.The design of refiner has great influence on the quality,efficiency and cost of paper.Double conical refiner has been a attention and study the issues in recent years,because of its dual characteristics of conical and axial force balance.According to the needs of certain enterprise,the research object of double cone refiner,the optimal design of structures,plate design and control system design of the refiner are studied.The first chapter firstly introduced the development of China's paper industry and toilet paper,and illustrated the importance of the refiner in the paper industry.Secondly,the types and characteristics of the conical refiner were reviewed,especially the development and characteristics of the double cone refiner.Finally,combined with the needs of enterprises,the research task of this paper was put forward.The second chapter mainly studies the structural optimization design of refiner.It includes the design and optimization of the main shaft structure:optimization of spindle deflection,design of axial floating structure,bearing installation,lubrication and sealing,the traditional worm wheel worm mechanism is used to adjust the clearance of the refiner,the structure analysis of grinding and disassembling manipulator and grinding chamber retractable mechanism was carried out,the conical degree and structural of the rotor was designed and so on.The third chapter mainly analyzes and optimizes the spindle,a key part of the refiner.Firstly,the strategy and influence factors of the dynamic and static optimization of the spindle were introduced.On this basis,the spindle model was established by using SolidWorks,and then it was imported to Abaqus for dynamic and static finite element analysis.Static analysis shows that after optimization,the deflection of the spindle ends is smaller,and the turning accuracy of the refiner is improved.The influences of spindle size on the spindle system's natural frequency of the refiner were stated in dynamic analysis.The fourth chapter mainly discusses the design of the plate.First,it stated the methods for the design of the plate at home and abroad.Second,the plates material,the plates design theory and the plate reference parameters design were introduced.Then,the two plates(integral and tiled)were designed based on the characteristics of this refiner.At last,in order to obtain the flow condition of the slurry,the refiner was modeled by 3D model software and imported into the Abaqus software to calculate with fluid dynamics code.The simulation analysis shows that the reduction of grinding disc clearance will increase the pressure of the plate;the pressure of the moving plate is greater than that of the fixed plate;the inlet pressure is greater than the outlet pressure.The fifth chapter mainly discussed the control system of refiner.First,three stages of the development of the refiner control system were introduced.Then,three methods for the clearance control of the refiner were introduced:mechanical,hydraulic and PLC control;At last,the control system was designed for the main motor of the refiner,the soft start method is used to control the refiner and a circuit diagram is designed.The main innovation points of this paper is the design of the bearing seat of the free floating spindle,the dynamic optimization of the free floating spindle by using the orthogonal combination method and the hydrodynamic analysis of the whole structure of the grinding chamber.