GPS技术在矿井贯通工程中的应用研究

GPS定位技术具有高精度、全天候、点间无需通视等优点。在大佛寺煤矿近井网的布设、解算中,利用GPS网内相对精度高的特点,控制近井点的相对点位误差;根据巷道贯通的特点,通过改变起算条件来消除起算数据误差。实践表明,GPS技术已在大佛寺煤矿三井高精度贯通中得到成功应用,其横向贯通误差仅为10 mm和18 mm。     

带公共变阻器电轴系统的平衡转矩分析

本文导出了带公共变阻器电轴系统的平衡转矩方程,并分析了平衡转矩的特点。     

变频励磁激振激发源的分析研究

本文就汽轮发电机组轴系固有扭频与振型实测用变频励磁激振激发源－三相全控整流桥触发角ａ按正弦规律变化时，整流电压对应交变分量中基波频率与幅值的确定及其同激振频率之关系进行了分析与研究。所得结论可为变频励磁激振的实际应用提供依据。     

沉井地压——一种特殊表土地压的探讨

分析探讨沉井在表土中下沉时所引起的受力现象及其相关的论点，迸发现沉井在正常下沉过程中，不仅仅会受到竖井表土地压的作用，更主要是沉井的前端（刃脚）受到被动土压力的作用。     

十字轴万向联轴器的失效分析和结构改进

十字轴万向联轴器是机械基础通用部件,又是传动装置中的易损部件。本文根据国内外十字轴万向联轴器的生产、使用和维修等诸方面情况,分析了十字轴万向联轴器的主要失效形式,并进一步提出其结构改进的方法。文内见解对延长十字轴万向联轴器的使用寿命和结构的改进具有一定指导意义和参考价值。     

引黄总干三级泵站出水竖井渗漏原因分析及处理

根据水力学渗漏分析计算并结合缺陷检查的情况，确定出具体的渗漏部位，然后采用合理的方法进行相应的渗漏缺陷处理。从渗漏处理的效果可以看出，经过处理渗漏量明显减少，效果显著，可见渗漏分析的结论是正确的，采用的方法是可取的。     

FANUC OiT数控车床进给轴安装与调试

数控车床进给轴是用来执行直线定位和切削运动的装置,其性能的好坏直接决定了数控车床的加工精度。通过对进给轴安装调试与检测全过程的试验研究,分析了进给轴伺服系统的常见故障,指出了各类故障的排除方法,为数控机床的维护提供了技术参考。     

Dynamic mass variation and multiphase interaction among steel,slag, lining refractory and nonmetallic inclusions: Laboratory experiments and mathematical prediction

The mass transfer among the multiphase interactions among the steel, slag, lining refractory, and nonmetallic inclusions during the refining process of a bearing steel was studied using laboratory experiments and numerical kinetic prediction. Experiments on the system with and without the slag phase were carried out to evaluate the influence of the refractory and the slag on the mass transfer. A mathematical model coupled the ion and molecule coexistence theory, coupled-reaction model, and the surface renewal theory was established to predict the dy-namic mass transfer and composition transformation of the steel, the slag, and nonmetallic inclusions in the steel. During the refining process, Al2O3 inclusions transformed into MgO inclusions owing to the mass transfer of [Mg] at the steel/refractory interface and (MgO) at the slag/re-fractory interface. Most of the aluminum involved in the transport entered the slag and a small part of the aluminum transferred to lining re-fractory, forming the Al2O3 or MgO·Al2O3. The slag had a significant acceleration effect on the mass transfer. The mass transfer rate (or the re-action rate) of the system with the slag was approximately 5 times larger than that of the system without the slag. In the first 20 min of the re-fining, rates of magnesium mass transfer at the steel/inclusion interface, steel/refractory interface, and steel/slag interface were x, 1.1x, and 2.2x, respectively. The composition transformation of inclusions and the mass transfer of magnesium and aluminum in the steel were predicted with an acceptable accuracy using the established kinetic model.     

立井施工的质量控制

在荫营煤矿四号风井区401风井、411风井工程施工中，坚持施工前认真审查设计图和施工组织设计，施工过程中的严格监控原材料质量和施工质量，施工后严格检查验收，从而保证了立井的施工质量。     

新元矿井进风立井井筒快速施工

阐述了山西新元矿井进风立井的工程及地质概况、施工方法和主要机械设备，重点介绍了该工程井筒的施工技术及施工组织和管理。