改变传统的柔性风筒连续和悬挂技术的探讨

探讨了改变传统的柔性风筒连接和悬挂技术。给煤矿企业柔性风筒的改进和优质安设找出了一个途径。     

尾矿坝的安全与加固

1990年5月21日第58届国际大坝会议在澳大利亚悉尼召开,会议对尾矿坝的安全与加固进行了讨论。本文就尾矿坝的结构型式及会议上提交的论文做一概括的总结论述.     

标准型圆锥破碎机动锥圆锥头可靠性分析

通过对标准型圆锥破碎机圆锥头的松动、摆动、振动等失效的外在表现形式及产生失效的原因进行分析计算,在对其结构做适当改进的基础上,寻求出间接提高圆锥头可靠性能的办法,如增加预紧力等,从而解决实际问题,达到可靠效果。     

基于AMESim和Simulink的液压伺服系统动态仿真

提出了基于AMESim和Simulink的液压伺服系统进行动态仿真的方法。以阀控液压缸为例,建立液压系统的动态数学模型,给出了仿真模型,详细介绍了如何利用AMESim和Simulink对液压系统动态特性进行仿真,同时分析了影响液压系统动态特性的主要因数。     

大隆煤矿采空区瓦斯抽放数值模拟与参数确定

用有限元数值模拟方法,结合图形显示技术,对大隆煤矿综采工作面采空区瓦斯抽放问题进行了计算分析。从理论上模拟了冒落非均质回采采空区内回风隅角处的瓦斯聚积过程。直观展示了瓦斯抽放时采空区流态、瓦斯分布变化的流体力学原理。模型中采空区流态计算用非均质渗流方程,瓦斯扩散运移基于瓦斯与大气两相混溶流方程描述。计算考虑了采空区沿边界冒落非充分压实的情况。利用数值模拟试验方法给出了合理的抽放流量和工作面通风量。     

Heavy metals distribution in fly ash from gangue power plant

To make assessment on its environmental security, fly ash samples were collected from the gangue power plant. Total content of heavy metals in sieved fly ash were analytically determined. We also carried out Tessier extractive experiments to check the chemical species of heavy metals. Experiment results show that the content of Cu, Zn, Pb and Cd ascend when particle size is smaller. Cu, Zn, Pb and Cd obviously enrich in particulate fly ash. The chemical species of heavy metal distribution ranking sequence generally is residual〉organic combinative〉Fe-Mn oxide combinative〉carbonate combinative〉ion-exchangeable. Lead＇s amiable-move species were high in proportion, amounted to 35%. Total content of Cadmium is at low level, but its ion-exchangeable species is relatively high in proportion. Nickel and zinc is mainly distributed in residue. Cu is mainly distributed in residue and organic combinative form. The content of manganese is relatively high in fly ash, and the carbonate combinative iron-manganese oxide combinative species are main chemical form. Cr is mainly distributed in residue, and its other chemical species are at low level. Compared with the soil background value of study area and Shandong Province, the content of Cu, Ni, Zn, Mn and Cr in fly ash of gangue power plant is lower. While contents of Pb and Cd were higher than background value, and amiable-move species is relatively high in proportion. They are more apt to cause heavy metal pollution.     

综放工作面采空区自燃"三带"的试验研究

通过沿采空区倾向布置测温探头和取样束管,对采空区温度及气体成分进行测定分析,得出北皂煤矿4402综采放顶煤工作面采空区的媒温和气样参数.并结合采空区煤炭自燃理论,确定了采空区自燃＂三带＂的范围,从而为合理选择预防采空区煤炭自燃的措施提供了科学依据.     

异形矿物的超细效应研究

本文主要讨论了异形矿物的机械法超细效应，超细粉体性能表征指标以及矿物材料机械加工方式的适用性，对比分析了矿物粉体的主要表面变化特征，肯定了矿物颗粒的微观内外界面，官能团与缺陷的生成，是影响粉体系列特征的主要因素。     

球磨机状态监测系统设计与故障诊断

针对球磨机传动系统设计了球磨机振动监测系统，采用信号的时域、频域分析相结合的方法对球磨机进行了振动监测和故障诊断，测试分析结果较好地反映了球磨机的真实工况和故障，为选矿厂对球磨机的检修和维护提供了技术支持。     

炮采放顶煤开采工艺研究与实践

1工作面地质条件2505工作面位于九矿二水平五采区南部,西部和25031工作面(未开采)相邻,南到F7断层防水煤柱边界,东与2507工作面(未开采)相接,北为-400皮带下山保护煤柱。工作面平均走向长度750m,平均倾斜长度120m,地质储量89.2万t。2505工作面直接顶为砂质泥岩,厚约5.4m,老顶为