YHZD-T30D full-auto production line for trapezoid square can. The speed can reach 30cpm.This line adopts conical expanding first,and then square expanding forming process,making the tinplate stretch evenly as well as the flanging, with grip flanging process.It avoids the flanging becoming arc and ensure the seaming quality. It uses purely mechanical cam transmission,cam conveying can,cam holding can, and makes the speed continuously adjustable. With protection device for can jam, it makes the production process run safely & smoothly.