Abstract: Provided is a method for separating and purifying fucoidan, including: S1, subjecting a Undaria pinnatifida powder to extraction in hot water, filtering, and concentrating by rotary evaporation in sequence to obtain a concentrate; S2, adding an aqueous calcium chloride solution to the concentrate obtained in S1 in batches, where the aqueous calcium chloride solution is excessive; S3, adding chitosan-crosslinked graphene oxide/ferroferric oxide to a resulting material system obtained in S2 to obtain a mixed system, placing the mixed system at room temperature, and chelating excessive calcium ions obtained in S2 while adsorbing proteins by the chitosan-crosslinked graphene oxide/ferroferric oxide; S4, conducting filtration to filter out a solid, and obtaining a liquid, which is an aqueous fucoidan solution; and S5, adding ethanol to a resulting concentrate obtained in S4 to precipitate the fucoidan, and then filtering and drying the fucoidan to obtain purified fucoidan.

Abstract: A strip soil loosening and crushing mechanism of a no-tillage planting machine has a connecting bracket, a cutter head assembly, and a soil crushing wheel assembly. The cutter head assembly has two star-shaped cutter heads of the same structure, which are symmetrically arranged at outer sides of the two supporting plates. The soil crushing wheel assembly has a spring combined structure, a soil crushing wheel combined structure and two crank brackets rotatably connected at the outer sides of the two supporting plates of the connecting bracket by a connecting shaft.

Abstract: The present invention discloses a strip soil loosening and crushing mechanism of a no-tillage planting machine. The machine has a connecting bracket, a star-shaped cutter head assembly, and a soil crushing wheel assembly. The star-shaped cutter head assembly has two star-shaped cutter heads with the same structure, which are symmetrically arranged at outer sides of the two supporting plates by star-shaped cutter head fixing shafts. The soil crushing wheel assembly has a spring combined structure, a soil crushing wheel combined structure and two crank brackets rotatably connected at the outer sides of the two supporting plates of the connecting bracket by a connecting shaft.