Research On The Device Of Setting The Freshwater Fishes' Heads And Backs In The Desired Direction

Fish processing technology in foreign countries started in the early 19th century, the mechanization at this stage has been developed in a very high level, also as the auxiliary processes of fish orientation arrangement, but it not completely solve this problem, and in foreign it's common in marine fish orientation, rarely applied to large freshwater body orientation. China' Freshwater Fisheries is one of the largest in the world, to address the problem of freshwater fish body orientation could lay a solid foundation for sustainable of freshwater fisheries'development.In this thesis, silver carp is taken as the research object, according to the technology of fish orientation at home and abroad as well as mechanical technology with other materials in the agricultural mechanization field, proposed the principle that use of tilt vibration table to set the freshwater fishes'head forward and the gradient slide to set the freshwater fishes'backs up, and designed and manufactured a vibrating table under the principles. Qualitative analysis the theory of the principle, and a preliminary theoretical analysis is proved the feasibility of the principles.Part of the silver carp fish tissue friction characteristics had been researched, the results show that the friction angle of the silver carp fish along the scales direction is less than reverse direction, the friction angle of head part is the minimum, and the tail'friction angle is the largest, water lubrication less than dry test results. According to the model of the vibration test stand, combined with screening material movement on the plate jitter in the screening field, to make the fish keep going down the vibration the motor speed must meet the conditions:505r/min<n<726r/min, and the power vibration motor excitation must meet the conditions:767.96N<Fm<1587.2N, when taking B=3mm, screen surface angle a=10°, the fish friction angle (φ=50°. Based the consideration aboved, the range of the vibration motor frequency, motor excitation force and the inclination of the table et al values can be initially identified.The initial position of the fish into the vibration test stand (A). vibration motor frequency (B), the exciting force (C) and vibration table tilt angle (D) were setted as factors, and the localization rate of fish(L), the directional time-consuming (t) were setted as index test during the experiment of setting the fishes" heads forward. The gradient ramp angle (a), vibration motor frequency (b), the exciting force (c) and vibration table tilt angle (d) were setted as the factors, the localization rate of fish (L), the directional time-consuming (t) were setted as the index test during the experiment of setting the fishes' backs up. The experiment results were that the total rate of successfully setting the fishes' head forward reached 97.53%, and the actions that setting the fishes' head forward could completed within 0.65～3.75s.The rate of successfully setting the fishes' backs up was 97.5%, and the actions of setting the fishes'backs up could completed within 0.65～3.75s, and each of the factors has a significant impact on the time-consuming. So the experiment results show that the mechanism of using the tilt vibration plate to set the freshwater fishes' heads forward and the gradient slide to set the freshwater fishes' backs up are feasible.