双螺杆磨浆机失效磨损研究和专用联轴器设计

发布时间：2018-04-09 21:00

本文选题：双螺杆磨浆机　切入点：螺杆　出处：《天津科技大学》2012年硕士论文

【摘要】：双螺杆磨浆机是一种新型资源节约型磨浆设备,具有优良的特性和广阔的应用前景。磨浆系统是双螺杆磨浆机的核心部件之一,但目前通过生产考核发现螺杆芯轴易折断、螺杆与机筒的磨损速度较快,使得双螺杆磨浆机失效破环、停产检修,从而造成磨浆成本的提高,因此有必要对双螺杆磨浆机机筒和螺杆失效、磨损进行研究,以提高可靠性、延长使用寿命。本文简要介绍了双螺杆磨浆机发展状况以及磨浆系统存在的问题,阐述了螺杆和机筒的磨损机理,综述了双螺杆挤出机螺杆机筒和盘磨机磨片磨损研究现状以及减少磨损的方法,通过分析各种减磨的方法,根据双螺杆磨浆机磨浆系统的实际设计要求,提出了减少断轴和磨损失效的设计方案。对双螺杆磨浆机螺杆断轴的原因和螺杆、机筒磨损机理的进行了理论分析,并运用ANSYS软件对螺杆芯轴受力分析进行了有限元分析和模拟,通过分析得到双螺杆磨浆机螺杆断轴和螺杆、机筒磨损的主要原因,并提出了避免螺杆断轴、减少螺杆和机筒磨损的改善措施。参考相关机械设备传动轴联轴器的选择,根据大型双螺杆磨浆机螺杆扭矩大,中心距受限的情况,设计了考虑径向约束的大扭矩鼓形齿联轴器,讨论了鼓形齿齿宽对齿形及加工的影响。在考虑接触特征的情况下,运用ANSYS软件对鼓形齿啮合、螺栓联接进行了非线性静力有限元分析,分析结果表明鼓形齿接触应力强度满足要求,保证螺栓联接强度有效方法是选择高强度螺栓和螺母,并适当增加联接法兰两侧的摩擦因数。本文深入研究了双螺杆磨浆机螺杆断轴和螺杆机筒磨损的机理,研究了大型双螺杆磨浆机专用联轴器的设计选型,研究了考虑径向约束的大扭矩鼓形齿联轴器的参数设计和有限元分析。本文的工作对于改善双螺杆磨浆机的设计、提高双螺杆磨浆机的可靠性、延长使用寿命具有重要的意义。
[Abstract]:Twin-screw mill is a new type of resource-saving pulp mill with excellent characteristics and wide application prospects.The grinding system is one of the core parts of the twin-screw mill. However, it is found that the screw core shaft is easily broken and the wear speed between the screw and the cylinder is faster, which makes the twin-screw mill fail to break the ring and stop production and maintenance.Therefore, it is necessary to study the failure and wear of twin screw grinding-machine cylinder and screw in order to improve reliability and prolong service life.This paper briefly introduces the development of twin-screw grinding-machine and the problems existing in the grinding-system, and expounds the wear mechanism of screw and cylinder.This paper summarizes the present situation of research on wear of screw cylinder and disc mill of twin-screw extruder and the methods of reducing wear. Through analyzing various ways of reducing wear, according to the actual design requirements of grinding system of twin-screw mill,The design scheme of reducing shaft break and wear failure is put forward.The causes of screw shaft breaking and the wear mechanism of screw and cylinder of twin screw grinding-mill are analyzed theoretically. The finite element analysis and simulation of screw core shaft force are carried out by using ANSYS software.The main causes of the wear of screw broken shaft and screw and cylinder of twin screw grinding-mill are obtained through analysis. The improvement measures of avoiding screw breaking shaft and reducing wear of screw and cylinder are put forward.Referring to the selection of transmission shaft coupling of related mechanical equipment, according to the large screw torque and limited center distance of large twin screw grinders, a large torque drum gear coupling considering radial constraint is designed.The influence of drum tooth width on tooth profile and machining is discussed.Considering the contact characteristics, the nonlinear static finite element analysis of drum tooth meshing and bolt connection is carried out by using ANSYS software. The results show that the contact stress intensity of drum tooth meets the requirements.The effective method to ensure bolt joint strength is to select high strength bolts and nuts and to increase the friction coefficient on both sides of the joint flange.In this paper, the wear mechanism of screw broken shaft and screw cylinder of twin screw grinding-mill is deeply studied, and the design and selection of special coupling for large twin-screw grout mill are studied.The parameter design and finite element analysis of large torque drum coupling considering radial constraints are studied.The work in this paper is of great significance for improving the design of twin-screw mill, improving the reliability of twin-screw mill and prolonging the service life.
【学位授予单位】：天津科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.4

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