拉力芯棒斜轧延伸机组的生产工艺及设备结构

详细地介绍了用拉力芯棒斜轧延伸机代替Φ７６ｍｍ自动轧管机的改造情况，以及拉力芯棒斜轧延伸机的生产工艺、主要设备技术性能和安装调整要求。     

回转窑窑尾密封的安装技巧

以常见的迷宫式密封装置和径向接触式密封装置的安装为例,针对实际安装中遇到的问题进行了分析,提出了在筒体变形、偏摆和窜动的情况下,能够保证密封安装精度的安装要点和安装技巧。     

压缩机消声器的声学特性测试分析及其改进研究

基于压缩机的实测分析 ,对现有的两种消声器进行了声学理论分析 ,运用声学四端网络法对现有的压缩机消声器进行了研究 ,得到消声器的插入损失等声学特性。在此基础上 ,提出了新的内插管双扩张室消声器设计 ,取得了 3dBA以上的降噪效果 ,并且没有功率上的损失     

A physical description of solids transport in flighted rotary dryers

In this paper, a solids transport model for flighted rotary dryers is presented. Emphasis is placed on combining statistical and mechanistic modelling efforts to create a physically motivated compartment model involving pairs of perfectly mixed tank reactors linked in a series arrangement. Here, each tank pair, or cell, aims to physically describe a finite slice of a case study industrial rotary sugar dryer, and is hence governed primarily by flight geometry and dryer operational variables such as rotational speed and dryer inclination. Solids flow paths are structured to properly represent the different modes of transport in the rotary dryer, and values of transport coefficients are based on calculated rates of rotational and axial flows. A solids dispersion variable is used to correlate the model residence time distribution (RTD) prediction with available data from a tracer study conducted during industrial operation of a full-scale raw sugar dryer. RTD results from the model show intuitive responses to variations in solids feed rate, rotational speed and drum inclination.     

尼龙织物圆网印花的常见疵病与防止

尼龙织物圆网印花的绝大部分疵病是在印花机上直接产生的。本文简要分析常用生产工艺条件下印花疵病的产生原因并提出解决措施。     

旋喷桩加固技术在厦门金桥苑住宅工程中的应用

在金桥苑住宅楼人工挖孔桩施工中 ,因地质勘察失误 ,在 B幢中原设计选择的残积粘土持力层实际上分布有岩石层和残积粉质粘土软层 ,因而造成一部分桩落在岩石上 ,另一部分桩落在软土上。由于误把残积粉质粘土当作残积粘土持力层 ,使得 B幢已浇灌好的人工挖孔灌注桩无法达到设计的承载力要求。经技术经济比较 ,采用旋喷桩地基加固处理后 ,满足了设计和使用要求 ,收到了良好的效果。对类似工程的地基处理有一定的借鉴作用。     

优化厚规格钢板剪切工艺

本文根据轧机的轧钢方式，轧出两头大的厚规格中厚板，分析圆盘剪的剪切和重叠量的调整情况，找到圆盘剪卡钢的原因，并提出圆盘剪剪切工艺优化措施。     

OPTIMUM OPERATING CONDITIONS IN DRYING FOODSTUFFS WITH SUPERHEATED STEAM

It is inferred from experimental data that in drying foodstuffs with superheated steam, the initial drying rate has a direct effect on the rate at which the overall drying takes place. That is, the faster the initial drying rate, the shorter the overall drying time. This criterion is very convenient because at the beginning, water moistens the sample external surface so evaporation does not depend on internal sample characteristics, but only on external convective heat and mass transfer rates. Mass and energy balance equations are solved and the result converted into a general initial drying rate equation, in which all dryer characteristics are grouped into one dimensionless parameter. The initial drying rate equation is mathematically maximized and the optimum working conditions determined. The result shows that initial drying rate always increase with increases of either the superheated steam temperature or velocity, but once these two variables are fixed, there exists at least one “optimum” pressure at which the initial drying rate is a maximum. Finally, the initial drying rate and optimum condition equations are applied to three model dryers, a dryer for a flat sheet, a fixed bed dryer and a rotary dryer. In each case, numeric values are computed and plotted as drying rate versus pressure curves, in which the optimum drying rate is also included. Also presented is a chart to compare the optimum pressures as functions of temperature and steam velocity for the three dryers.     

进口RAS罗茨鼓风机的修复技术和技术改造

邯钢动力厂对进口RAS罗茨鼓风机机组技术进行消化吸收,制定了修理规程、技术标准和拆装程序,掌握了修复技术,并对部分装置进行技术改造,如加装在线轴承温度监测系统;同时,应用摩圣技术延长鼓风机使用寿命和采用喷涂技术修复报废件等,取得了较好的运行效果。     

MICROSTRUCTURE AND FATIGUE PROPERTIES OF A WELDED DUPLEX STAINLESS STEEL

Abstract— In response to the increasing structural applications in duplex steels for welded structures, fatigue behaviour of a SAF 2304 grade duplex stainless steel was investigated, considering both the base metal and GTAW welded joints. Fatigue curves and fatigue limits under rotary bending fatigue were obtained. The study focused attention on the microstructural features of fatigue crack propagation of the two series of experiments, thereby permitting an evaluation of the tortuous crack path of welded joints and the mechanisms related to threshold microstructural barriers.