摘要：空气密度对输电线路风荷载计算的影响,现行技术标准缺乏明确规定,对设计冰厚离地计算高度规定亦欠合理。基于伯努利公式和克拉珀龙方程,分析指出对于中、高海拔地区的线路,空气密度对风荷载计算及风区划分的影响不容忽视,建议采用考虑空气密度的设计风压或设计标准风速为指标进行输电线路风荷载计算及风区划分;鉴于高度和档距对覆冰的综合影响,建议输电线路设计冰厚计算高度取导、地线平均高度。

摘要：For the backfill hydraulic support as the key equipment for achieving integration of backfilling and coal mining simultaneously in the practical process, its characteristics will directly influence the backfill body's compression ratio. Horizontal roof gap, as a key parameter of backfilling characteristics, may impact the backfilling effect from the aspects of control of roof subsidence in advance, support stress, backfilling process and the support design. Firstly, the reason why horizontal roof gap exists was analyzed and its definition, causes and connotation were introduced, then adopting the Pro/E 3D simulation software, three typical 3D entity models of backfill hydraulic supports were built, based on the influence of horizontal roof gap on backfilling effect, and influence rules of four factors, i.e. support height, suspension height, suspension angle and tamping angle, were emphatically analyzed on horizontal roof gap. The results indicate that, the four factors all have significant impacts on horizontal roof gap, but show differences in influence trend and degree, showing negative linear correlation, positive linear correlation, positive semi-parabolic correlation and negative semi-parabolic correlation, respectively. Four legs type is the most adaptive to the four factors, while six legs(II) type has the poorest adaptability, and the horizontal roof gap is small under large support height, small suspension height, small suspension angle and large tamping angle situation. By means of optimizing structure components and their positional relation and suspension height of backfill scrape conveyor in the process of support design and through controlling working face deployment, roof subsidence in advance, mining height and backfilling during engineering application, the horizontal roof gap is optimized. The research results can be served as theoretical basis for support design and guidance for backfill support to have better performance in backfilling.

摘要：简述了永磁悬挂除铁器工作原理、受力分析,给出了计算公式,并举例计算确定了产品最佳设计参数。

摘要：作为实现回填和采煤一体化的主要设备,回填液压支架特性将会影响回填体压缩率。水平顶板间隙作为回填特性的关键参数,会从预先控制顶板沉降、支撑力、回填过程和支架设计等方面影响回填效果。文中首先分析了水平顶隙存在的原因,介绍其定义、起因和内涵。然后通过Pro/E 3D仿真软件进行仿真,考虑水平顶板对回填效果、支架高度、悬架高度、悬架角和夯实角等因素的影响,建立了3种典型的回填液压支架3D立体模型,并在顶隙的基础上进行分析。结果表明,这4个因素均对顶板水平缝隙有显着影响,但影响趋势和程度存在差异,分别显示负线性相关、正线性相关、正半抛物相关和负半抛物相关。

摘要：设计师Uenna Postma将手柄与桌子、吊灯结合在一起,通过手柄可调节吊灯的悬挂高度。

摘要：简述防爆永磁悬挂除铁器工作原理、受力分析，给出计算式；举例计算产品最佳设计参数。