中国远在春秋时期就发明了起重机—辘轳，即今天的绞车。这是一种将旋转运动转变为直线运动的机械，用来吊起重物。应用辘轳原理制成的机械有悬门沈机、巢车、铁索吊桥和连弩之车等。悬门沈机，远在公元前６４６年就已发明。据《左传庄公２８年》“悬门不发”。庄公２８年... China far in the Spring and Autumn period invented the crane - the potter’s wheel, that is today’s winch. This is a machine that converts a rotational motion into a linear motion, used to lift a heavy object. The application of the principle of the potter’s wheel gate machines have been made, the nest car, cable suspension bridge and crossbow car and so on. Hanging door machine, far in 646 BC has been invented. According to “Zuo Zhuang Gong 28 years” “hanging door is not made.” Zhuang Gong 28 years ...