Abstract: Disclosed is a variable-size and variable-amount topdressing device. The device includes a main frame; an image recognition unit; a variable-amount fertilizer applying portion; two electric push rods which are vertically and fixedly connected to inner opposite surfaces of the main frame respectively; and a variable-size fertilizer applying portion arranged at an output end of the variable-amount fertilizer applying portion, where a height of the variable-size fertilizer applying portion is adjusted by the two electric push rods, an output end of the variable-size fertilizer applying portion is arranged corresponding to the output end of the variable-amount fertilizer applying portion, and the variable-size fertilizer applying portion is used for adjusting a fertilizer applying range. The variable-amount fertilizer applying portion, the variable-size fertilizer applying portion and the two electric push rods are electrically connected to the image recognition unit.

Abstract: Disclosed is a variable-size and variable-amount topdressing device. The device includes a main frame; an image recognition unit; a variable-amount fertilizer applying portion; two electric push rods which are vertically and fixedly connected to inner opposite surfaces of the main frame respectively; and a variable-size fertilizer applying portion arranged at an output end of the variable-amount fertilizer applying portion, where a height of the variable-size fertilizer applying portion is adjusted by the two electric push rods, an output end of the variable-size fertilizer applying portion is arranged corresponding to the output end of the variable-amount fertilizer applying portion, and the variable-size fertilizer applying portion is used for adjusting a fertilizer applying range. The variable-amount fertilizer applying portion, the variable-size fertilizer applying portion and the two electric push rods are electrically connected to the image recognition unit.

Abstract: A large circulating fluidized bed cell bioreactor and a method for culturing animal cells. The reactor comprises an agitator tank body (01), an agitator tank base (50), a water inlet silicone hose (06), a backflow silicone hose (08), a cell culture tank (10), a culture tank base (40), a backflow pipe (15), a water inlet pipe (12), an agitator (20), a reactor tray (30), and a tube support plate (60). By means of cooperation among the above components, defects and shortcomings of fluidized bed cell bioreactors in the prior art including proneness to microbial contamination, a low level of dissolved oxygen, and a low working volume, are effectively resolved, advantageous in the popularization and application of this technology.