该机主要用于通风管道椭圆形风管的制作，风管经螺旋成型后，在该椭圆风管机一次性扩张成型至客户所需的椭圆风管的标准尺寸，具有成型好，效率高，操作简便等优点，是通风管道生产中不可缺少的设备。 It is used for the ovalizer duct spiral duct,the ovalizer duct machine expands it into standard size,with the character of good shape,high efficiency,easy is indispensable for duct manufacturing. 液压压扁机 Hydraulic staving machine 本机床是椭圆风管的配套设备。主要用于螺旋风管转换成椭圆风管前工序之用，原理是:先将圆风管逐步压成椭圆形，然后进入椭圆风管机，扩张成型，是客户选择椭圆风管制造的理想设备。 It`s the supplement for ovalizer duct used before the working procedure of round duct turns into oval principle is to press a part of spiral round pipe into oval shape before using the spiral pipe ovalizer.