婷婷色中文字幕综合在线_女人被弄到高潮的免费视频_国产精品久久久久av福利动漫_亚洲热线99精品视频_人人妻人人澡人人爽人人精品电影

  Straightening machine is a straightening equipment for metal profiles, bars, pipes, wires, etc. The straightener changes the straightness by extruding the bar with straightening roller. Generally, there are two rows of straightening rolls with different quantities. There are also two roll straighteners, which straighten materials with different diameters depending on the angle change of two rolls (concave in the middle, hyperbolic roll). The main types are pressure straightener, balance roll straightener, shoe roll straightener, rotary reverse bending straightener and so on.