Design And Optimization Of An Integrated High-pressure Air-knife Cleaning Device

Under the influence of the port environment and the contents of the container,the outer surface of the container adheres to more dust such as coal and fertilizer.The dust obscures the nameplate information and may even pose a risk of cross-contamination.At present,the cleaning of the surface adhesives of the box mainly depends on manual or semi-automatic equipment.In order to reduce the pressure of water cleaning,dry container cleaning device is designed which combines air knife blowout,roller brush sweep and negative pressure suction.The surface of container is clean without water.Firstly,the purging flow field of air knife is studied by using Fluent software.The flow characteristics of the drainage basin in the integrated cleaning device of "blowing-sweeping-sucking" are further analyzed.The structural parameters of the cleaning device are optimized.The force model and motion equation of dust particles are summarized.The influence of process parameters on dust collection efficiency was studied by DPM model.The main tasks accomplished are as follows:(1)A general scheme of automatic container cleaning system is proposed.The process flow of bi-directional cleaning and the cleaning interior structure compatible with multi-width containers are presented.This paper mainly introduces the all-inone cleaning device of air collecting knife blowout,roller brush sweep and vacuum cover suction.(2)Based on Fluent software,the influence of outlet slit size parameters on average hysteresis pressure,standard deviation of hysteresis pressure,half pressure width and gas consumption under different gas supply pressure is analyzed.An evaluation model was established to analyze the optimal export size.The reliability of the simulation setup is verified by similar experiments.A prototype of the air knife is also made to verify the blowing and sweeping ability of the air knife.(3)Streamlining and establishment of a basin model of a cleaning device consisting of an air knife,a roller brush and a vacuuming cover based on the optimization of the air knife structure.Improve the structure of the cleaning device according to the velocity trace diagram.The relative position of the suction cover and the suction cover are further studied to influence the convection fi eld.The structural parameters of the cleaning device are optimized by means of single factor and orthogonal tests combined with extreme variance analysis and variance analysis.(4)The dust particles attached to the surface of the box are taken as the research object.The physical properties and stress characteristics of dust particles were analyzed.The dust principle of air knife and roller brush and the motion equation of dust particles in the vacuum cover are summarized.The three-dimensional drainage basin of the cleaning device is established.Three technological parameters including negative pressure of vacuum cover,air supply pressure of air knife and speed of roller brush were selected.The DPM model was used to analyze the influence of these process parameters on dust collection efficiency.