目前大、中型拖拉机都配带液压式悬挂装置,但正成倍增多的手扶拖拉机不配带自动升降装置,一般仍用手杆式起落机构来升降农机具,效率低,劳动强度大,所以迫切要求及早给手扶拖拉机配上自动升降装置。为了完成这项任务,在院党委的正确领导下,组织了由工人,教师和领导参加的研制小组。经过多次试验改进,终于试制成功与长白山一12型手扶拖拉机配套的机械式升降装 At present, large and medium-sized tractors are equipped with hydraulic suspension devices, but the multiplied number of walking tractors are not equipped with automatic lifting devices, and are generally still used to lift and lower farm machinery with hand-lever lifts, which is inefficient and labor-intensive. Requires early delivery of walking tractor coupled with automatic lifting device. In order to accomplish this task, under the correct leadership of the party committee of the hospital, a research and development team attended by workers, teachers and leaders was organized. After several tests to improve, finally successfully trial and Changbai Mountain a 12-type tractor supporting mechanical lifting device