41results about How to "Free circulation" patented technology

The utility model relates to the technical field of alfalfa planting, in particular to an alfalfa cuttage sand culture device which comprises a sand bed body, a cuttage mechanism and a lifting mechanism. The sand bed body is provided with vent holes and a filter screen to guarantee ventilation of the bottom and prevent sand from leaking out; a cutting support of the cutting mechanism is in sliding connection with a sliding rail on the inner wall of the sand bed through a sliding block, the position and distance of a cutting assembly on the cutting support can be adjusted through an adjusting mechanism, and the adjusting mechanism controls the cutting operation process through a limiting bolt, a rotating cylinder and other components; a lifting frame of the lifting mechanism can horizontally slide on the sand bed body, and a lifting screw in threaded connection drives the cuttage support to ascend and descend, so that cuttage depth adjustment is achieved. The device improves the air permeability of the sand bed by accurately adjusting the cuttage position, spacing and depth of the alfalfa seedlings, provides a good growth environment for the alfalfa seedlings, effectively improves the survival rate and yield of the alfalfa seedlings, and is suitable for efficient cultivation of the alfalfa.