铝箔剪切机碎屑收集管优化设计

Optimal design of scrap collection tube for aluminum foil shearing machine

传统铝箔剪切机碎屑收集装置存在2支管吸力不均匀问题,严重影响剪切机工作效率。文中使用计算流体力学方法(Computational Fluid Dynamics,CFD)对管路挡板结构进行了优化改进,在深入分析挡板布置方式对支管流态影响规律基础上,给出管路优化建议。数值结果表明:2个挡板高度相等时,第2个挡板会对第1个支管后部气流产生“阻碍”作用,形成低速回流区,无法形成负压及吸力;随着第2个挡板高度降低,第2个支管内负压及速度值降低,第1个支管内负压及速度值增大;当挡板比例为1/2时,2个支管物理量趋于相等,支管口速度相差约3%,可满足工业需求。此外,改变挡板高度及间距并保持挡板高度比例为1/2时,2个支管速度相差约5%,说明研究结果具有一定工程适用性。

The scrap collection device of the traditional aluminum foil shearing machine has the problem of uneven suction of the two pipes,which seriously affects the working efficiency.Applying Computational Fluid Dynamics(CFD),we optimized and improved the pipeline baffle structure upon an in-depth analysis on the effect of baffle layout on the branch pipe flow pattern.Suggestion for piping optimization are put forward.Numerical results show:when the heights of the two baffles are equal,the second baffle will“obstruct”the air flow behind the first branch pipe,forming a low-velocity recirculation zone.Thus,negative pressure and suction fail to be formed.The decreasing height of the second baffle reduces the negative pressure and velocity of the second branch pipe,which increases the negative pressure and velocity in the first branch pipe.When the baffle ratio is 1/2,the physical quantities of the two branch pipes tend to be equal,and the difference in the speed of the branch pipe mouth is about 3%.The industrial needs can be met.When changing the baffle height and spacing and keeping the baffle height ratio at 1/2,the speed difference between the two branch pipes is about 5%.It shows that the research results have certain engineering applicability.