西德的 S·G(Siempelkamp GmbH)和 Krefeld 公司已研制了一系列与普通螺旋压力机大不相同的 NPS 型高能螺旋压力机(见图)。这种压力机最重要的是,可在飞轮与螺杆间没有固定联接机构的情况下工作。飞轮向一个方向连续运转,工作行程时,运动能通过一个可控离合器传给螺杆,而在每一次工作行程结束时,离合器脱开,将飞轮从螺杆上分离开。它还有一个独立的液压系统使滑块回到上 Siempelkamp GmbH and Krefeld in West Germany have developed a series of NPS high energy screw presses (see photo) that differ greatly from conventional screw presses. The most important thing about this press is that it works without a fixed coupling between the flywheel and the screw. The flywheel runs continuously in one direction. During the working stroke, the motion can be transmitted to the screw through a controllable clutch. At the end of each working stroke, the clutch is disengaged to separate the flywheel from the screw. It also has a separate hydraulic system that brings the slider back up