用小四轮拖拉机拖挂铺膜机进行铺膜作业时,每到地头,辅助人员都要将手伸到铺膜机下整理地膜。这项工作不太安全,因为液压系统降落农具的速度很快,操作时稍有不慎,农具突然下落,就可能将手砸伤。当在液压操纵手柄下面的适当部位安装一个“缓降螺钉”时,手柄向下降位置推动到一定程度即被缓降螺钉挡 With a small four-wheel tractor trailing film spreading machine for filming operations, everywhere, support staff have to reach the shop under the film machine finishing plastic film. This is not a safe job, as hydraulic systems can land on agricultural implements very quickly, operate with a slight carelessness, and a sudden drop in farm implements can crush them. When installing a “Downscrew Screw” in the proper place under the hydraulic control handle, the handle is pushed down to a certain extent and then descend slowly.