新型锤片式粉碎机粉碎室内锤片的优化和测试

发布时间：2018-03-31 10:13

本文选题：粉碎机　切入点：数值模拟　出处：《内蒙古科技大学》2015年硕士论文

【摘要】：锤片式粉碎机改变了传统的筛分模式实现了单机循环粉碎，对于过大颗粒容易堵塞筛网难以透筛，物料容易形成环流层，筛网磨损严重等问题得到了有效的解决，本论文主要是对粉碎室内部转子组的重新设计以及对改变转子组结构前后分别进行单向气流以及气固两相流进行模拟。首先，本论文讲述了课题研究的意义以及研究的背景，对有关于饲料粉碎机相关的理论做了详尽的赘述，对常用的饲料粉碎机以及本课题研究的粉碎机如何工作进行了分析，主要造成粉碎机分离效率低的几个主要因素作了详细的说明，在师兄师姐的研究基础上进行剖析，最后，确定自己研究的方向。其次，粉碎机进行了单相流以及双相流进行了模拟数值模拟[1]。比较单相流和双向流对粉碎室的模拟结果，MRF是一种定常的求解方法，UDF是时间作为变量的动网格计算方式，其中利用MRF计算的稳定性，速度优于利用UDF计算的结果，动网格中UDF是一种自定义的函数，其计算的结果接近实际，但在运算时间所上是MRF的9-10倍。再次，改进前后的锤片组互相对比分析。根据模拟结果可知改进前后的锤片对物料的破碎力以及速度有所提高，加了肋板之后物料的速度明显大于不加肋板的速度，提高了切向速度，即锤片与物料接触的时候切向速度增加，有利于减小能耗，提高物料产量。环流层出现的本质问题是原料无效撞击过多，是部分原料围绕着锤片端部的线速度作同向转动，加肋板之后环流层明显减弱，，提高了物料和锤片之间的破碎力以及物料与物料之间的破碎力。最后，加工出改进之后的锤片组，对破碎机进行了实验分析。分析物料运动情况，验证数学模型以及数值模拟的准确性[2~8]。并以喂料量和转速作为两个因素，测量出不同喂料量以及不同转速粉碎室内物料的破碎合格率的情况，以一定时间出料量作为标准进行比较，对比两种情况的粉碎率。
[Abstract]:The hammer shredder has changed the traditional screening mode and realized the single machine cycle comminution. The problems such as too large particles easily clogging the screen screen are difficult to be sifted through, the material is easy to form circulation layer, and the sieve mesh wear is serious has been effectively solved.In this paper, the redesign of the rotor group in the comminution chamber and the simulation of the unidirectional flow and the gas-solid two-phase flow before and after the change of the rotor group structure are carried out.First of all, this paper describes the significance of the research and the background of the research, has done a detailed description of the relevant theory of feed crusher, and the commonly used feed crusher and how to work on the research of the grinder are analyzed.The main factors that cause the low separation efficiency of the pulverizer are explained in detail, and the direction of the research is determined on the basis of the research of the elder brother and elder sister.Secondly, the single phase flow and two phase flow are simulated by the pulverizer [1].Comparing the simulation results of single-phase flow and bidirectional flow on the comminution chamber. MRF is a steady solution method, in which the stability of MRF is better than that of UDF.UDF is a kind of self-defined function in moving grid. Its calculation results are close to reality, but the computation time is 9-10 times that of MRF.Thirdly, the hammers before and after the improvement were compared with each other.According to the simulation results, the crushing force and velocity of the improved hammers on the material are improved, and the velocity of the material is obviously higher than that of the non-ribbed plate after adding the ribbed plate, and the tangential velocity is increased.That is, the tangential velocity increases when the hammer is in contact with the material, which is beneficial to reduce the energy consumption and increase the material output.The essential problem of the circulation layer is that there is too much invalid impact of the material. Part of the material rotates in the same direction around the linear velocity of the end of the hammer, and the circulation layer obviously weakens after adding the ribbed plate.The crushing force between the material and the hammer and the crushing force between the material and the material are improved.Finally, the improved hammers were processed and the crusher was analyzed experimentally.Analyze material movement, verify the accuracy of mathematical model and numerical simulation [2 / 8].The crushing rate of different feed quantity and speed was measured by two factors, and the crushing rate was compared with the standard of material output in a certain time, and the comminution rate of the two kinds of cases was compared.
【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

【参考文献】