电动机轴颈磨损原因分析及修理方法

常见的电动机轴颈磨损原因：装配不合理、键装配不合理、电动机轴承损坏.当转子轴的外圆磨损较轻微,弯曲度小于0.2 mm时,采用磨外圆→镀铬→磨外圆至图纸尺寸,当轴颈磨损严重时,采用补焊→粗车→精车→划线→铣键槽,对修后的轴进行强度校核和转子的动平衡试验,满足工作需求;此方法工艺简单.易操作、成本低,从而保证了设备的正常运转.     

Skin friction related behaviour of artificial turf systems

The occurrence of skin friction related injuries is an issue for artificial turf sports pitches and remains a barrier to their acceptance. The purpose of this study was to evaluate the current industry standard Securisport® Sports Surface Tester that measures skin surface related frictional behaviour of artificial turf. Little research has been published about the device and its efficacy, despite its widespread use as a standard FIFA test instrument. To achieve a range of frictional behaviours, several “third generation” (3G) carpet and infill combinations were investigated; friction time profiles throughout the Securisport rotations were assessed in combination with independent measurements of skin roughness before and after friction testing via 3D surface scanning. The results indicated that carpets without infill had greatest friction (coefficients of friction 0.97–1.20) while those completely filled with sand or rubber had similar and lower values independent of carpet type (coefficient of friction (COF) ≈0.57). Surface roughness of a silicone skin (s-skin) decreased after friction testing, with the largest change on sand infilled surfaces, indicating an “abrasive” polishing effect. The combined data show that the s-skin is damaged in a surface-specific manner, thus the Securisport COF values appear to be a poor measure of the potential for skin abrasion. It is proposed that the change in s-skin roughness improves assessment of the potential for skin damage when players slide on artificial turf.     

膏体充填钻孔优化措施

为了减少矿山因尾矿库尾砂堆积等环境因素的影响,国内矿山都把尾矿库尾砂采用新技术进行回填,膏体从地表到井下输送过程中钻孔起到了至关重要的作用。通过分析及实践证明,钻孔磨损是影响充填的主要因素。根据驰宏公司实践经验．提出采用合理施工位置、确保钻孔垂直度、采用合理的管材、采用控制膏体浓度、有利益延长充填钻孔的寿命。     

浅谈汽车轮胎保养与使用

汽车轮胎对行驶安全性起着十分重要的作用,轮胎的状况对汽车的动力性、制动性、平顺性、行驶稳定性和燃料的经济性有着直接的影响,所以对轮胎的保养很重要,必须保证汽车轮胎的技术状况在要求的范围内。文中主要介绍了汽车轮胎的重要性,论述了汽车轮胎检查保养的手段、汽车轮胎的正确使用方法及维护维修技巧。     

新疆双语教师第二语言磨蚀的成因及对策

语言磨蚀和语言学习关系密切。通过对新疆双语教师第二语言磨蚀的主要原因的分析,对如何减少双语教师习得的第二语言磨蚀提出应对策略。     

应用铁谱记录诊断法诊断液压设备系统的磨损

铁谱记录诊断法是逐步发展起来的一门检测液压系统故障的新技术，通过对其原理和方法的分析研究，探讨其在机械设备液压系统故障诊断上的应用。     

阶梯溢洪道大单宽流量的水流特性及消能效果

溢洪道─宽尾墩─斜坡加糙─台阶─"Ｔ"型墩消力池联合消能工的试验研究表明,溢洪道（溢流坝）作成阶梯形状后,并与掺气减蚀措施相结合应用,在大单宽流量下,消能显著。由于阶台坝面掺气基本上可以减免空蚀,减轻冲刷,因此是一种较好的新型消能工。     

语言磨蚀理论对开展ESP教学的启示

专门用途英语(ESP)是指与某一特定学科领域或专业知识相关的英语,是根据学习者特定的需要或目的而开设的英语语言课程。本文阐述了影响外语磨蚀的主要因素,探讨了开展ESP教学对于防止外语学习者的语言磨蚀及完善我国大学英语教学的启示。