The semi-active roller weeding knife comprises a blade, a blade holder, a buffer spring, blade teeth, a bearing, a blade shaft, and an
electromagnetic clutch. The blade is mounted on the blade holder, which relies on the buffer spring to
cushion the blade, effectively removing weeds of varying depths. The blade of the semi-active roller weeding knife has blade teeth mounted outside the blade shaft, with a bearing mounted on one side and an
electromagnetic clutch mounted on the other. The working process of the semi-active roller weeding knife is as follows: 1. The
electromagnetic clutch is energized, the blade teeth are fixed to the blade shaft, and the blade teeth
cut the weeds. 2. As more weeds are
cut, the blade resistance increases, reaching a set value 1. 3. The electromagnetic
clutch is de-energized, the blade teeth disengage from the blade shaft, the blade teeth release the weeds, and the blade resistance decreases, reaching a set value 2. 4. Steps 1 to 3 are repeated. 5. The weeding task is completed. The beneficial effects of this invention are: it inherits the existing advantages of roller weeding knives, has a simple driving method, and provides good weeding effect. The engagement and disengagement of the electromagnetic
clutch enables both the removal of deep-rooted weeds and ensures
continuous operation of the weeding knife.