| The ZJ17 cigarette unit undertakes the task of cigarette production in major cigarette companies.Its superior performance has brought many benefits to the company,but according to statistics,the stems removed by the original machine stem stick separation device under the premise of ensuring the quality of cigarettes During the signing,every 500 g wasted about 107 g of shredded tobacco,and the silk content in the stem reached over 20%.Aiming at the problem of severe waste of shredded tobacco and high content of shreds in ZJ17 unit,this paper designs a secondary separation system of stems on the basis of secondary separation system of stems and performs the separation effect in the system.Analysis and research.This article firstly made a further discussion on the current method of material separation,and selected vacuum and centrifugal air separation methods to further realize the secondary separation of the stems.This method can effectively improve the separation effect.Using the related theories of fluid mechanics and gas-solid two-phase flow,the forces on the separation of the two materials,stem and tobacco,were analyzed.The principle of the stalk separation system of the original model is analyzed,and the inner wall of the arc of the separation system is designed using the Archimedes helical approximation method of unequal square shape,and two diversion and drainage areas are added near the inner wall.At the same time,the design and analysis of the connecting pipeline of the two-level system were carried out.The results show that the structural design and piping layout are reasonable.In order to further study the influence of the change of the airflow field inside the separation system on the separation effect,a physical model is established by using a combination of equations,configurations and series parts design,and then a complete separation device flow field model is established.Numerical simulation of the air flow field in the separation space of the dredging zone and different feed inlet diameters,different inner wall arc radii and different exit degrees,and the fluid trace diagram,velocity cloud diagram and vector diagram are obtained by post-processing software.The analysis shows that the diversion area,inlet diameter,inner wall arc radius and outlet degree all have an effect on the separation effect.At the same time,the gas-solid two-phase flow theory is used to establish a realistic tobacco and stem particle model in EDEM,and the CFD-DEM coupling method is used to vary the air flow velocity,the inlet diameter,the inner wall arc radius and the outlet degree.9 groups of orthogonal test models were designed based on factors,and the separation performance of the 9 groups of models was analyzed with the same amount of cut tobacco and stem sticks.The quality of the cut tobacco and stem sticks was analyzed by the Bin group.It is greatly reduced,the silk content in the stem becomes smaller,and the movement separation process of the whole stem and tobacco is better.Also using the CFD-DEM coupling method,the connection coupling model is first established,and then the air flow field and particle movement inside the horizontal straight pipe,60° elbow and large diameter elbow in the connecting pipe are analyzed in Fluent and EDEM,respectively.Subsequently,a secondary separation system was installed on the ZJ17 cigarette unit,and the waste of shredded tobacco per 300 g of original stem sticks was reduced from the previous 64.46 g to 5.70 g,and the silk content in the stem was reduced to 1.9%.The quality of cigarettes produced in roll production is not affected,bringing considerable benefits to the enterprise. |
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