我厂从英国购进一台2000吨机械压力机(二手货),其封闭高度为914mm,工作垫板厚304mm,装模高度为610mm。该设备主要用于压制汽车纵梁,模具的闭合高度为800mm。由于压力机的装模高度小于模具的闭合高度,因此对该压力机进行了封闭高度的加高改造。经过对多种方案的分析,我们采取使拉紧螺栓两头的螺母分别向外退出的方式(见图),并在 I plant from the UK purchased a 2,000 tons of mechanical presses (second-hand goods), the closure height of 914mm, work pad thickness 304mm, the mold height of 610mm. The device is mainly used to suppress the car stringers, mold closing height of 800mm. As the press is less than the height of the mold closing height of the mold, so the height of the closure of the press height modification. After analysis of various schemes, we take the way that the nuts that tighten the two ends of the bolt are respectively withdrawn outward (see the figure)