Study Of Electrostatic Adsorption And Debris Removal Devices

At present,leaf beating and re-baking companies rely on manual selection to remove fine debris from the wind-selected pieces of tobacco.The high level of concentration required by the handpickers during their work for long periods of time results in inconsistent quality of the handpicked pieces of tobacco.In order to improve the stability of the quality of tobacco debris removal and reduce the workload of the debris pickers,this paper takes the debris in the tobacco debris blown out by wind selection:weeds,feathers and woven bag yarn as the object of study,and uses electrostatic adsorption separation theory,homemade electrostatic adsorption experimental platform to conduct pre-experiments to verify the feasibility of electrostatic adsorption for debris removal;simulates and analyses the magnitude of electric field strength and the distribution range of different structures of high voltage electrostatic field,the experiments were carried out to determine the feasible structures.Design of an electrostatic adsorption and debris removal device based on the results of simulation analysis and production practice.And through the home-made device for debris removal test,analysis of electrostatic voltage,adsorption distance,negative pressure air volume and environmental humidity and other factors on the debris removal rate,optimize the high-pressure electrostatic adsorption debris removal production process parameters.The details of the study are as follows:（1）Analyze the force state of debris in the electrostatic field and establish its force model in the electrostatic field;According to the force model of the debris to analyze the state of motion of the debris,and based on force model to establish its trajectory in the electrostatic field equations,theoretically verify the feasibility of its separation and removal method with tobacco debris using electrostatic field adsorption.Using the adsorption voltages of the common and difficult to remove debris from tobacco chips during actual production:weeds,feathers and woven bag yarn as indicators,the feasibility of debris removal by electrostatic field adsorption was verified at the experimental level and a range of values for factors that have a large influence on the debris removal rate was determined by means of pre-experiments.（2）The COMSOL software was used to simulate the electric field distribution of a feasible structure of electrostatic adsorption and debris removal device,the electric field strength and distribution range of the electrostatic field were compared and analyzed,and the feasible structure was verified by actual tests.Simulation analysis of the factors affecting the electrostatic field distribution reveals that the adsorption distance,electrostatic voltage,electrostatic roller radius and distribution spacing have a large influence on the electrostatic field distribution.The overall design and component selection of the structure of the electrostatic adsorption and debris removal device is based on the results of the simulation analysis.（3）The removal rate of three common impurities in tobacco leaf fragments:weeds,feathers,and woven bag silk is used as the performance evaluation index of the device,and the electrostatic voltage of the high-voltage electrostatic DC power supply、debris adsorption distance、ambient humidity and negative pressure air volume are the influencing factors,a single-factor test on debris removal was conducted using a home-made adsorption device to analyze the influence of each factor on the debris removal rate;The optimized parameters for the removal of debris were obtained by combining single-factor experiments and response surface experiment as well as orthogonal tests designed for the actual test environment:adsorption distance of 7 cm,electrostatic voltage of 37.5 k V and negative air pressure of 2500 m³·h^-1;Three validation tests were also implemented with this combination of parameters,with an average debris removal rate of 72%,slightly lower than the six-position manual picking,with a high removal efficiency.