颚式破碎机能耗和齿板结构参数研究

【作者】 李磊；

【导师】 母福生；

【作者基本信息】 中南大学 ， 机械设计及理论， 2009， 硕士

【摘要】 据统计,物料加工的第一道工序——破碎作业的耗电占到选矿厂总耗电量的50%以上。同时以使用的PE250×400颚式破碎机一副齿板(固定齿板和动颚齿板各一块),总重约0.2吨,按全国破碎机最少拥有量7万标准台计算,每年全国要消耗高锰钢5.6万吨。这直接算入物料破碎成本,齿板的损耗成为除颚式破碎机能耗以外的又一大损耗。因此颚式破碎机的能耗和齿板结构参数是颚式破碎机制造厂家和使用者十分关心的重要问题,所以本文主要围绕降低颚式破碎机能耗和延长齿板使用寿命的课题进行研究。论文的主要工作和创新点如下:1.运用耗散结构理论和损伤力学理论,结合应变等效假设,推导出物料破碎过程中的损伤能量释放率与损伤变量之间的关系式,并在此基础上得到物料破碎过程中的损伤能量释放率临界阈值;2.以颚式破碎机的结构参数为基础,结合物料在颚式破碎机中的分布特征,推导出颚式破碎机电机功率数学模型,运用该模型计算出三种型号颚式破碎机电机功率,并通过三种型号颚式破碎机破碎砂岩的电机功率测试实验,验证了推导的数学模型合理性;3.运用模糊随机理论对PE250×400颚式破碎机动颚齿板的受力情况进行了分析,应用Ansys软件对齿板的应力进行了计算,并对齿板的结构参数进行了改进,改进后的齿板结构降低了齿板的应力集中,延长了齿板的使用寿命,节约了齿板的制造材料,同时降低了颚式破碎机破碎物料的能耗。更多还原

【Abstract】 Statistics indicated that the materials processing’s first working procedure--crushing job consumes the electricity to occupy above ore dressing plant total power consumption 50%.Simultaneously uses a PE250×400 jaw crusher jaw plate(fixed jaw plate and moves jaw plate each together),the gross weight 0.2 ton,according to the national jaw crusher least standard capacity 70,000 computation,every year the nation must consume the high manganese steel 56,000 tons approximately.This includes the material crushing cost directly,jaw plate’s loss into besides jaw crusher energy consumption another big loss.Therefore the jaw crusher’s energy consumption and the jaw plate design parameter are the important questions which the jaw crusher manufacturer and the user cared,therefore this article mainly revolves to reduce the jaw crusher energy consumption and the extension jaw plate service life topic conducts the research.Paper prime task and innovation as follows:1.Using the diffusion structural theory and the damage mechanics theory,the union strain equivalent assuming,infers in the materials crushing process the damage energy liberation rate and between the damage variable relationship,based on this and obtains in the materials crushing process damage energy liberation rate critical threshold value;2.Take the jaw crusher’s design parameter as the foundation,the union material in jaw crusher distributed characteristic,infers the jaw crusher electrical machinery power mathematical model,utilizes this model to calculate three kind of model jaw crusher electrical machinery power,and through three kind of model jaw crusher crushing sandstone’s electrical machinery power test experiment,has confirmed the inferential reasoning mathematical model rationality;3.Utilized the fuzzy stochastic theory to carry on the analysis to the PE250×400 jaw plate stress situation,has carried on the computation using the Ansys software to the jaw plate stress,and made the improvement to the jaw plate design parameter,after the improvement jaw plate structure reduced the stress concentration,lengthened the service life,saved the manufacture material,simultaneously reduced the crushing materials energy consumption.更多还原