混沌式振动磨机理论研究

发布时间：2018-06-25 06:48

本文选题：振动磨机 + 混沌激振器　；参考：《昆明理工大学》2013年硕士论文

【摘要】：粉磨设备是应用于工、农业部门和高新技术产业中不可缺少的加工设备,利用粉磨设备可以将大至几米的物料经过一段或多段粉碎加工,将物料加工到几毫米至几微米,甚至到亚微米级。但随着工农业的发展,粉磨物料的电耗不断增加,用于粉碎粉磨的电耗已达世界总电耗的10%-12%,而在这些行业的初期设备投资中,用于购买粉磨成套设备的费用已达50%-70%。因此对粉磨行业的设备工艺更新,降低粉磨的成本已变得非常重要。以往国内外粉磨技术的发展,长期停留在对原有技术上改造和加大规模上的研究,难以打破目前粉磨行业的现状。本文通过改变常规振动磨机的激振源,设计出混沌振动磨机。通过对振动磨机的粉磨原理进行研究发现振动强度是影响粉磨效率的主要因素,而常规振动磨机的振动幅度小、频率单一、筒内存在乏能区,很难实现高效生产。而混沌振动磨机在混沌激振器的激振下,产生混沌振动,振动体在原有的主频振动基础上增加倍频振动。这种宽频振动迫使磨筒内物料与研磨介质运动剧烈、随机,使得粉磨冲击力增大,筒内物体摩擦剪切的机会增加,同时有效避免了乏能区的产生本文首先分析物料粉碎原理,找出影响粉磨效率的主要因素,分析不利因素产生原因并提出优化方案。其次,文章中利用Lagrange方程分别建立常规振动磨机和混沌振动磨机的数学模型,并使用Matlab对其运动轨迹进行仿真。通过对仿真结果进行对比,证明混沌振动磨机的运动时混沌振动,振动强度大于常规振动磨机。然后使用三维建模软件对混沌振动磨的振动体进行建模,根据三维模型参数并结合KAM定理计算设计端面式混沌激振器,并对其他振动元件设计选型。同时使用Adams对修正后的振动体进行动力学仿真。通过仿真结果看出,混沌振动磨机的振动体的运动轨迹是在一定范围内不确定、不规则的近圆运动。振动破碎速度大、频率高,使粉磨加工快速有效。研究分析表明,混沌振动磨机的粉磨效率和精度高于常规振动磨机,而且没有乏能区的存在,减少能耗同时使粉磨加工粒度均匀。此设备为解决目前粉磨行业难题提供有效解决方案。
[Abstract]:Grinding equipment is an indispensable processing equipment used in industrial, agricultural and high-tech industries. With grinding equipment, materials as large as several meters can be processed by one or more segments, and materials can be processed to several millimeters to several microns. Even sub-micron. However, with the development of industry and agriculture, the power consumption of grinding materials is increasing, and the power consumption of grinding materials has reached 10- 12 of the total power consumption in the world. In the initial equipment investment of these industries, the cost of purchasing complete sets of grinding equipment has reached 50 to 70 percent. Therefore, it is very important to update the equipment process and reduce the cost of grinding. With the development of grinding technology both at home and abroad, it is difficult to break the present situation of grinding industry because of its long term research on the transformation of the original technology and the enlargement of the scale. In this paper, the chaotic vibration mill is designed by changing the exciting source of the conventional vibration mill. By studying the grinding principle of vibration mill, it is found that the vibration intensity is the main factor affecting the grinding efficiency, while the vibration amplitude of the conventional vibration mill is small, the frequency is single, and there is a lack of energy region in the cylinder, so it is difficult to realize high efficiency production. The chaotic vibration is produced in the chaotic vibration grinder under the excitation of the chaotic vibration exciter, and the vibration body increases the frequency doubling vibration on the basis of the original main frequency vibration. This kind of wide-band vibration forces the material and the grinding medium to move violently and randomly, which increases the impact force of grinding and increases the chances of friction and shearing of objects in the cylinder. At the same time, the paper analyzes the principle of material grinding, finds out the main factors that affect grinding efficiency, analyzes the causes of unfavorable factors and puts forward the optimization scheme. Secondly, the mathematical models of conventional vibration mill and chaotic vibration mill are established by Lagrange equation, and the motion trajectory is simulated by Matlab. By comparing the simulation results, it is proved that the chaotic vibration intensity of the chaotic vibration mill is higher than that of the conventional vibration mill. Then the vibration object of chaotic vibration mill is modeled with 3D modeling software. According to the 3D model parameters and combining with Kam theorem, the end face chaotic vibration exciter is designed, and other vibration elements are designed and selected. At the same time, the modified vibrator is simulated by Adams. The simulation results show that the motion track of the vibrating body of the chaotic vibration mill is uncertain and irregular in a certain range. The vibration crushing speed is high, the frequency is high, makes the grinding processing fast and effective. The results show that the grinding efficiency and precision of the chaotic vibration mill are higher than that of the conventional vibration mill, and there is no lack of energy region, which reduces the energy consumption and makes the grinding granularity even. This equipment provides an effective solution to the current grinding industry problems.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TB44;TH113.1

【参考文献】