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粉碎机粉碎室内气固两相流场特性的测试

发布时间:2018-06-04 10:31

  本文选题:试验测试 + 粉碎室 ; 参考:《内蒙古科技大学》2015年硕士论文


【摘要】:饲料粉碎机是饲料加工过程中重要设备之一,由于锤片式粉碎机具有良好的通用性、结构简单、价格便宜、适应性强、工作可靠等优势,得以广泛应用。因粉碎室内存在物料环流层,造成物料升温大、耗能高和物料过粉碎等诸多问题。为了使传统锤片式粉碎机存在的问题得以解决,新型锤片式饲料粉碎机采用了不同于常规的粉碎和分离方式,将环形齿板安装在粉碎室内壁,通过齿板和锤片的摩擦及击打来粉碎物料,并在上置的分离装置中对物料进行分离。在粉碎机粉碎室中,良好的多相流场结构和特性是物料被合理粉碎、顺利输送和回收的必要条件,是影响粉碎机物料粉碎、分离和功耗的重要因素,因此,,对新型锤片式粉碎机粉碎室内多相流场特性的研究是研究粉碎机粉碎机理、筛分机理以及对整机进行优化设计的关键所在。 本文将从三个方面对粉碎室内流场压强分布进行研究: (1)基于虚拟仪器技术,设计一套关于粉碎机粉碎室内气压测量的测试系统,包括仪器选型、测量点分布、传感器安装、传感信号引出、传感器标定、主轴转速标定和数据采集等,并对粉碎室进行测量试验,记录原始测量数据。 (2)利用LABVIEW强大的数据和信号分析工具对采集到的压强信号做数字信号处理。针对采集信号特点(有用信号为低频),设计一个集成的虚拟数字滤波器,得到原始信号中的有用成分,并记录数据,对数据结果整理并做比较分析。 (3)将测量数据点图形化,用6个图形化的平行描述截面来表达粉碎室空间的压强强度的大小和分布。鉴于所测量的数据点有限,本文将采用遗传算法和BP神经网络结合的方法推测和补充未知数据点,根据足够多的数据点描绘出描述截面的压强强度图,分析得出结论。
[Abstract]:Feed pulverizer is one of the important equipment in the process of feed processing. It is widely used because of its good versatility, simple structure, low price, strong adaptability and reliable operation. There are many problems in crushing room, such as high temperature, high energy consumption and over crushing. In order to solve the problems existing in the traditional hammer mill, the new type hammer feed mill adopts the different comminution and separation methods, and the ring tooth plate is installed on the wall of the crushing chamber. The material is crushed by friction and impact of the tooth plate and hammer, and separated in the upper separation device. In the comminution chamber of pulverizer, good multiphase flow field structure and characteristics are the necessary conditions for material to be comminuted, transported and recovered smoothly, and are the important factors that affect the crushing, separation and power consumption of pulverizer material. The study on the characteristics of multi-phase flow field in the grinding chamber of a new type of hammer mill is the key to the study of the mechanism of grinding, screening mechanism and optimization design of the whole machine. In this paper, the pressure distribution of flow field in crushing chamber is studied from three aspects: Based on the virtual instrument technology, the paper designs a test system about the pressure measurement in the pulverizer crushing chamber, including instrument selection, measurement point distribution, sensor installation, sensor signal extraction, sensor calibration. The spindle speed is calibrated and data collected, and the raw measurement data are recorded by measuring and testing the comminution chamber. 2) using the powerful data and signal analysis tool of LABVIEW to process the collected pressure signal. According to the characteristics of the collected signal (the useful signal is low frequency), an integrated virtual digital filter is designed to obtain the useful components of the original signal and record the data. (3) the measurement data points are graphed and the size and distribution of the pressure intensity in the comminution chamber space are expressed by six graphical parallel sections. In view of the limited number of measured data points, the method of combining genetic algorithm and BP neural network is used to speculate and supplement the unknown position. According to enough data points, the pressure intensity diagram describing the section is described, and the conclusion is obtained by analysis.
【学位授予单位】:内蒙古科技大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:S817.122

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