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深锥浓密机搅拌刮泥耙扭矩力学模型

ISSN号：1672-7207
期刊名称：中南大学学报(自然科学版)
时间：2012.4.4
页码：1469-1474
分类：TD433[矿业工程—矿山机电] TD926.2[矿业工程—选矿]
作者机构：[1]北京科技大学土木与环境工程学院,北京100083
相关基金：国家自然科学基金重点资助项目（50934002）; 国家自然科学基金资助项目（51104011）; 长江学者和创新团队发展计划项目（IRT0950）
相关项目：多相多场条件下浸矿体系响应机制及其过程调控

关键词：深锥浓密机, 过载停机, 搅拌刮泥耙, 扭矩, 力学模型, deep-cone thickener, overload shutdown, scraper rake, torque, mechanical mode

中文摘要：

基于深锥浓密机内部不同高度、不同浓度尾砂对耙子运行的影响,对耙子进行受力分析,提出复杂结构耙子扭矩的计算模型。根据实际现象,将浓密机部物料分布划分为流体区和散体区两大区域,散体区内尾砂无流动性;运用浆体流变学原理和散体力学原理分别分析位于不同区域内耙子构件的受力状态,对不同的构件提出相应的扭矩模型,最终建立一种新的复杂结构耙子的扭矩力学模型。最后,利用该模型对现场深锥浓密机驱动参数进行验算。研究结果表明：最大扭矩为633.808 6 kN.m,超出停机保护额定值21.85%;小耙子产生的扭矩占耙子总扭矩的37.96%,贡献最大。这一结果从理论上解释了深锥浓密机压耙及压耙后无法重启的原因。

英文摘要：

Based on the impact on rake operation of different height and concentration of tailings in the thickener,the stress of rake was analyzed,and a torque model with complex structure rake was proposed.According to the actual phenomenon,the thickener was divided into two zones,the fluid zone and granular zone considering material＇s distribution in the thickener,and granular tailings can not flow.Slurry rheology and granular mechanics were used to analyze stress state of rake in the two zones,different torque models were raised according to different structures,and a new toque mechanical model of complicated rake was obtained.Finally,adopting the model,the driving parameters of a deep-cone thickener used in a mine were checked.The results show that the max torque is 633.808 6 kN？m,which exceeds the shutdown protection value of 21.85%.Column generates 37.96% of the total torque,which is the largest proportion.The results have explained the reasons why the deep-cone thickener rake shutdown can not be restarted in theory from aspects of rake configuration and slurry concentration.