| The pollution of air and dust is relatively serious in our country.There are too many dust and soil on the ground.The sweeper is prone to dust during the cleaning operation and forms secondary pollution.The cleaning efficiency of the sweeper is generally low.The dust content exceed the standard,which seriously affected the cleaning effect.Therefore,under the premise of ensuring the cleaning efficiency and the cleaning effect,how to effectively reduce the dust content in the secondary dust and the exhaust gas of the garbage can will become the main research direction of the sweeper.This paper analyzes the structure of cleaning and the mechanism of cleaning operation firstly,and focuses on the internal structure of the dust removal system of the sweeper.The CFD simulation method was used to model and simulate the cleaning system of the cleaning vehicle,and the flow field characteristics of the cleaning system of the cleaning vehicle were analyzed.Then,the structure of the dust removal system of the sweeper is introduced,and the structure of the air duct system and the fan structure are improved.The pressure field and velocity field of the flow field are simulated under the structure of the duct system before and after the improvement.The cleaning system of the sweeper was introduced again,and the cleaning system was structurally improved.Based on the established system simulation results,the performance of the prototype was measured before and after optimization,and comparative analysis was carried out.The results show that:(1)The new model is modified by the dust removal passage and the dust passage,and the overall flow characteristics are similar,except that the flow rate of the dust removal passage portion is larger than the original model,but the flow rate of the fan passage portion becomes small.At the same time,as the cross-sectional area of the cylinder becomes larger,the flow velocity on the same cross section is slightly reduced.(2)The simulation analysis of the provided multiple sets of fan models shows that the backward inclined blades exhibit better fan performance than the planar blades,and the more the backward inclined blades,the better the performance,but the opposite is true for the planar blades(3)The 11 back-tilt blade structures vacuum fan,and a 6-channel spiral cylinder shape air duct were selected under the integrated channel flow,pressure field distribution and dust removal channel speed.(4)The flow field structure of the cleaning system is changed little,but the flow rate and the structure at the garbage inlet are slightly increased between the structure unimproved and improved.In addition,it is found that increasing the main brush has little effect on the flow change by monitoring the flow at the fan channel and the circular channel of the dust removal system.(5)Comparing the test results of the original and the optimized sweeper,it can be found that the performance of the optimized model has been improved.The cleaning efficiency has been increased from 95%to 99%.The cleaning rate and the cleaning speed have been improved,then work efficiency improved,the cleaning ability increase about 10%.And the cleaning particle size range is widened.The cleaning particle size slightly improves;it can clean the larger particle size of the garbage.After simulation analysis and optimization of the test results of the sweeper,the cleaning efficiency and speed have been improved to varying degrees,and the results are consistent.Therefore,the theoretical analysis provides effective theoretical support for the sample,and provides effective guidance for the follow-up optimization design of the sweeper. |
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