电梯溯源电梯原是一种垂直升降设备,两千多年前,作为载人载物垂直上、下的升降装置是一种靠奴隶用绳子吊拉木板而上下往返运行的。十九世纪中叶有一名机械师发明了用水箱带动的升降设备,载人的笼子与水箱分别悬挂在滑轮的两边,水箱充水后变得沉重而下降, The elevator traceability elevator was originally a kind of vertical lifting device. Over 2,000 years ago, the vertical lifting device as a manned load was a kind of slave device that used a rope to lift and pull a board to run up and down. In the mid-nineteenth century, a mechanic invented a lifting device driven by a water tank. The manned cage and the water tank were hung on the two sides of the pulley, and the water tank became heavy and dropped after filling.