Abstract:

The development of technology requires that the drawing frame should achieve high speed, but most domestic drawing frames can't meet this requirement, so a method to improve the drawing speed of drawing frame was studied in this paper. Firstly, a method was proposed to enhance the speed of drawing frame by increasing the diameter of front roller of the drafting mechanism. Then, through an analysis and calculation of the drawing performance of the drawing mechanism, the feasibility of this method and its influence degree on the drawing performance were verified. Finally, a modal analysis of the front roller was carried out by Ansys software, the first six natural frequencies of the front roller were acquired and compared with the working frequency of the front roller. The analysis results show that: the diameter of front roller of the drafting mechanism can increase from 35mm to 48mm, on the premise that the drafting effect was guaranteed. Taking a drawing speed of 600m/min as an example, with the original angular velocity, the speed can reach 823m/min, up 37.17%, after the diameter is increased. No matter the diameter of the front roller is 35mm or 48mm, there is no resonance in the front roller, that is, no fracture in the front roller.

Key words: drawing frame, drafting system, front roller, high-speed, natural frequency

摘要：

科技的发展进步要求并条机能够实现高速化,但国内并条机大都达不到高速化要求,因此需研究一种提高并条机出条速度的方法。首先提出一种通过增大牵伸机构前罗拉直径以提高出条速度的方法,接着通过对并条机牵伸机构牵伸性能的分析计算,验证该方法的可行性和对牵伸性能的影响程度,最后采用Ansys软件进行前罗拉的模态分析,得到前罗拉的前六阶固有频率,并和前罗拉工作频率进行对比分析。结果表明:在保证牵伸效果的前提下,牵伸机构前罗拉直径可从35mm增大到48mm;以出条速度600m/min为例,保持原角速度运转,直径增大后出条速度可达823m/min,增幅高达37.17%;前罗拉直径增大前后,均不会发生共振,不会出现前罗拉的破坏。

关键词: 并条机, 牵伸机构, 前罗拉, 高速化, 固有频率