耕耘机、移植机、起垄机、除草机、开沟机等农业机械,多是由拖拉机牵引进行作业的。这些机械在作业过程中,机体应尽可能维持水平。但是,拖拉机力大而重,而与其相匹配的农业机械则很轻,当拖拉机提起这些农业机械转移或急转弯时,或由于土壤条件变化,农业机械会在拖拉机上发生摆动。因此,当三点悬挂装置上装有农业机械时必 Tiller, transplanting machine, ridger, weeding machine, ditching machine and other agricultural machinery, mostly by the tractor traction operation. During the operation of these machines, the body should maintain its level as much as possible. However, tractors are heavy and heavy, and their matching agricultural machines are light, and agricultural machinery can swing on the tractor as the tractor picks up the farm machinery or turns sharply, or as soil conditions change. Therefore, when the three-point suspension device is equipped with agricultural machinery