Design and research of the spindle-shaped fish vaccine adsorption injection device

Aiming at the problem that inserting a needle into the abdomen of spindle-shaped fish can easily damage the internal organs during vaccine injection, this paper takes grass carp as the experimental object and designs a fry adsorption injection device. Through theoretical analysis, the key factors affecting the adsorption force are determined. The internal cavity of the adsorption block is simulated and optimized under the given boundary conditions. The single-factor test shows that the H-shaped suction head has the best adsorption effect. Further orthogonal experiments found that the height of the adsorption port, the adsorption port’s length, and the diameter of the adsorption port are important factors that affect the test results, and they are arranged in descending order of their importance. The optimal parameter combination is the adsorption port height of 3 mm, adsorption port length of 15 mm, and adsorption pore diameter of 3 mm. Under these parameters, the success rate of needle insertion is 98%, and the survival rate of fry is 100%, which can meet the production requirements. In summary, the adsorption and injection device is simple in design, easy to operate, and can significantly reduce the damage to the fish body. It provides an effective solution and design reference for fish vaccination.