Design And Research Of Automatic Feeding Device For Post-harvest Cabbage Trimming System

Chinese cabbage output ranks the first in the world.But the post-harvest cabbage retains a part of the old leaves and root,the processing of the post-harvest cabbage needs to be repaired first,followed by grading and packaging.As the first link of the trimming system,the feeding device unloads the post-harvest cabbages in the bin,and conveys them into the follow-up links.The feeding seriously affects the production of the trimming system.Cabbage belongs to leafy vegetables.The leaves are easy to damage and rot,and the shape is large,so that the supply of post-harvest cabbage has high standards and requirements.The study aims at the problems of high-throughput and low-damage feeding,taking the post-harvest cabbage as research objects.The feeding device of the cabbage trimming system was designed.The device can meet the feeding of cabbages of different sizes and shapes,and has adaptability.The main studies are as follows:(1)Determination of the overall scheme of the automatic feeding device for the cabbage trimming system.Combining with the manual feeding method,a homogeneous,low-loss,and high-throughput feeding of cabbage in the feeding device was proposed.A clamping sub-channel feeding scheme and a reversed monomer feeding scheme were proposed.Determine the reversed discharge and monomer sequencing method as the final design scheme.The cabbage was driven by the cylinder to realize the discharging of the cabbage,and the single-layer,single-row,single uniform feeding was achieved from the space stacking through the single ranking mechanism.(2)Study on the physical and mechanical characteristics and the impact of swing damage on cabbage.The physical shape parameters,mechanical characteristics and influencing factors of oscillating impact damage of cabbage are related to parameter design and simulation settings.The results showed that there were differences between different varieties of cabbage and individuals of the same variety;Using high-speed photography technology,the collision recovery coefficient of the cabbage related to the simulation of the overturning and unloading process was determined by the collision bounce test.The limit heights of non-destructive collision between cabbage and aluminum plate,conveyor belt,foam,and sponge were 13 mm,64mm,370 mm,and 800 mm.The collision force between cabbages should not be greater than 38 N to ensure that the cabbages were not damaged.(3)Design of the key components and control system of the automatic feeding device of the cabbage trimming system.Structural design of the key components of the device such as the turning frame,single-layer distribution roller,buffer track,and variable pitch roller.In order to realize the automatic operation of the feeding device,control system principle and control process were designed,and the control system hardware was selected.(4)Damage and motion analysis of cabbage feeding process based on virtual simulation.Based on the EDEM simulation of the fruit bin turning angular velocity,fruit bin turning angle,and lid opening angular velocity at different values,analyze the movement of cabbage in different areas of the fruit bin,and compare the cabbage damage rate.The simulation results showed that cabbage did not appear to be mixed;as the angular velocity of the fruit bin was increased,the damage rate of cabbage was increased first and then decreased.With the increase of the angle of the bin,the damage rate of cabbage increased.With the increase of the opening angular velocity,the damage rate of cabbage decreased first and then increased,the damage rate of cabbage was small.Based on the ADAMS simulation of the single pitch process of variable pitch rollers,the rationality of the scheme and the design of key components and the range of operating parameters were verified.The simulation results showed that the angular range of the variable pitch roller was about 140 ? 180 ° / s,and the pitch of the variable pitch roller was about 160 ? 210 mm.(5)Prototype and test.According to the overall plan of the feeding device,the key components and the design of the control system,the prototype was trial-produced and debugged.Through the single factor test of flipping and unloading,the accuracy of the simulation model was verified,the parameter range was determined,and the orthogonal test was carried out.The bin turning angular speed was 50 ° / s,the bin flip angle was 105 ° and the upper cover opening angular velocity was 30 ° / s.Through the ranking and conveying orthogonal test,the optimal parameter combination of the ranking and conveying mechanism was determined as follows: variable pitch roller pitch was 185 mm,variable pitch speed was 30 r / min,when the spherical diameter of cabbage was 121 ? 150 mm,the feeding pass rate of the ranking conveyor mechanism was the highest.The verification test was carried out,and the results show that: under the optimal parameter combination,the cabbage damage rate was 8.3%,and the feeding pass rate was 91.3%,and the working efficiency was 22 pieces / min.The feeding device designsed in this study met the performance.