| At present,the high-density offshore aquaculture accelerates the pollution of the environment,and the problem of a decline in water quality leds to the decline in the quality of aquatic products in offshore in China.In order to reduce the pressure of offshore aquaculture,improving the level of sustainable utilization of marine fishery resources and the quality of aquaculture,so marine aquaculture needs develop into deep waters,and the offshore aquaculture resource has not been fully developed.Fish catching is one of the largest links of the labor intensity in the process of marine aquaculture.Large marine aquaculture enterprises generally use fish pump to realize high-efficiency automatic fish catching,but its power is higher and need equip large working ship.Guangdong coastal aquaculture enterprises and fishermen are limited by conditions,and widely use artificial or low automation equipment for fish catching.Therefore,developing fish catching equipment of small power that is suitable for using on small and medium sized fishing ship.For the problems above,according to the basic principle of the screw conveyor and putting forward a design scheme of fish catching equipment with spiral internal guide vane drum-type.Designing the helical structure and drive system,conducting mechanical analysis when the fish is conveyed to reseach the force and movement.Using ANSYS to conduct simulation analysis of helicoid in different rotate speed and different angle,then studying the total deformation,equivalent strain and equivalent stress in different working conditions.The equipment is conducted field experiment to research its reliability,transmission rate,the electric power consumption and loss rate of fish in different rotate speed and different angle.The results show that:(1)It is known from statics analysis that the transport process of fish is the axial acting force of spiral vane,and the larger axial force in the inner wall of the drum,the better the transmission effect.It is known from kinematic analysis that axial velocity increases with increasing diameter and radial velocity increases first and then decreases.(2)Contrasting and analysing the simulation results of helix in different rotate speed and different angle,and using MATLAB to conduct polynomial curve fitting.It can be seen from the fitting curve that the total deformation,equivalent strain,equivalent stress and the rotate speed of the helix are positive correlation.The total deformation and the angle of the helix is negative correlation,then equivalent strain and equivalent stress are in peak value when the angle is 15°.The maximum equivalent strain and maximum equivalent stress occur in the contact between the front blade of the helix and the inner wall of the roller,at the same time in the bearing support position of the helix appears stress concentration.(3)The experiment using control variable method,the equipment no-load power consumption is 224.4 W.It can get to know that the power consumption increases with the increase of rotate speed,and in the angle of 30°,rotate speed of 50 r/min,the maximum power consumption is 503.8 W.It can get to know that the power consumption increases with the increase of angle,and in the angle of 10°,rotate speed of 30 r/min,the minimum power consumption is 101.2 W.(4)Before the experiment,the device no-loading runs for an hour and normal operation.During the experiment,the device is faultless and the experiment is carried out smoothly.After the experiment,the device no-loading runs normally and the parts are not damaged,so the experimental device is reliable.The visual method was used to test the two sides of golden pompano,and calculating the number of damaged golden pompano is one and the damage rate is about 0.1%. |
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