【作者】 刘亚丽；

【导师】 唐倩； 黄仑；

【作者基本信息】 重庆大学 ， 工业工程， 2006， 硕士

【摘要】 2800粗轧机是我国上个世纪自行设计、制造的轧制设备,是某厂的大型关键设备。近年来随着轧制负荷增大,主传动系统在轧制过程中存在轧制力矩不足,电机电流过大,制约了生产的正常进行。针对上述原因拟对2800粗轧机主传动系统扩容改造,并将目前的直流电机变交流电机,在轧制速度保持不变的前提下,增大轧制力矩以满足生产的需求。因而开展2800热粗轧机主传动系统改造方案研究,确定电机扩容改造的最大功率,同时找出主传动系统的薄弱环节,并提出相应的改造措施,具有重要的理论意义和工程实用价值。本文针对2800粗轧机主传动系统扩容改造,采用经典材料力学理论和有限元法等分析手段,对主传动系统中齿轮座(包括人字齿齿轮、轴、轴承、箱体地脚螺栓等)、联接轴、传动轴、扁头和叉头等关键零部件强度进行了分析计算,得出了将目前2800热粗轧机主传动系统主电机功率从6400 kw(直流电机)提高到7000 kw(交流电机,交交变频),并通过减少人字齿轮上、中、下轴瓦的厚度来提高人字齿轮的中心距,将目前人字齿轮的齿数从22增加到25,齿轮精度从目前的8级提高到7级精度,对齿轮齿高和齿向进行修形;适当增加连接轴左叉头(工作辊侧)几何尺寸以提高强度,适应主传动系统电机功率提高对其强度的要求等结论。更多还原

【Abstract】 Rough mill 2800 is the key equipment of squeezing and extending in aluminum processing plant, which was designed and machined independently by our country in the last century. Because of the limited design capacity and now growing annual production, the main transmission is becoming vulnerable with the increasing loads, which leads to frequent failure in the system. By now, the main transmission system has the symptoms of deficient roll torque and overload current, and consequently production is compromised. For improving the roll capacity and enhancing competitive ability, the main transmission system needs to be improved according to the current situation. Concrete and comprehensive method is developed to analyze the bearing capacity of weak links which is caused by expansion of power in the main transmission system. Moreover, the method will provide reference to studies on characteristics of transmission system in like rough mills theoretically and practically.In this paper, key parts (herringbone gear , shaft, bearing, attachment bolts, coupling shaft, notch, palm end) of the main transmission system are analyzed by classic mechanics and computer simulation technology in line with design theory. Based on these analyses, reasonable improvements are proposed. Power of motor will be expanded from 6400KW with direct current to 7000 to 8000KW with alternating current so that roll torque will be strengthened to meet the need of production under the same rolling velocity. By decrease of thick of top、middle、down bush, the center distance of herringbone gear is cut down, number of gear is from 22 to 25 ,the accuracy manufacture of gear is from level 8 to level 7, modified of shape of gear; properly increase of geometry dimension of left notch is for enhance of strength, which is adapt to the increase of power motor.更多还原