【摘要】：現(xiàn)代工業(yè)發(fā)展呈突飛猛進的態(tài)勢,在包裝生產(chǎn)領域,粉體包裝的發(fā)展更是日益成熟。傳統(tǒng)粉體包裝機械存在著諸多問題,如粉體夾帶氣體,粉塵污染,生產(chǎn)效率較低等。如今,在保護環(huán)境以及機械自動化與智能化的新形勢下,傳統(tǒng)粉體包裝機械已不能很好地滿足包裝需求。本研究針對充填包裝中粉體物料的密實輸送問題,提出解決密實問題的方法,設計密實輸送裝置的結構參數(shù)和包裝工藝參數(shù)并驗證結構參數(shù)的合理性,運用離散元軟件對粉體物料的密實輸送進行仿真模擬。分析粉體包裝行業(yè)內包裝機械的生產(chǎn)現(xiàn)狀、機械化程度以及傳統(tǒng)包裝機械存在的問題,論述了粉體充填包裝裝置及相關領域的國內外研究現(xiàn)狀與研究進展,對所研究粉體物料的概念及基本特性進行分析,多方面分析包裝物料的特性、粉體夾帶氣體的原因及其影響,為粉體密實輸送方法的提出提供依據(jù)。結合普通螺桿的參數(shù)設計原則、密實比等包裝生產(chǎn)要求以及粉體螺旋輸送理論,提出螺距組合式的密實輸送螺桿,即將輸送螺桿分為進料段、密實段、排氣段以及卸料段。對密實輸送螺桿的輸送量、螺旋葉片的直徑、螺距尺寸、螺旋軸直徑、密實比、驅動功率等主要參數(shù)進行分析并計算,并運用三維實體軟件對密實輸送螺桿進行實體建模。理論分析密實輸送螺桿的強度和剛度條件,并采用有限元的方法,以ANSYS Workbench為平臺,對所設計的密實輸送螺桿進行結構靜力學分析和預應力模態(tài)分析,得到其工作時的應力應變分布情況以及固有頻率和振型,并分析其分布規(guī)律,從而檢驗其主要參數(shù)設計的合理性。應用離散單元法對粉體在密實輸送螺桿和包裝容器的運動過程進行仿真分析,使得粉體顆粒在輸送過程的運動狀態(tài)和輸送軌跡可視化。分析螺桿轉速分別為90rpm、100rpm、110rpm、120rpm時,粉體的質量流量等變化規(guī)律。對密實輸送螺桿的進料段、密實段、排氣段以及卸料段等不同功能段處的粉體速度、運動密度變化情況進行分析。仿真模擬粉體充填至包裝容器后,在不同振動幅度和頻率的工藝參數(shù)下,分析粉體的振動密實過程。仿真結果一方面檢驗輸送螺桿參數(shù)設計的合理性并對結構參數(shù)的優(yōu)化提供指導,另一方面驗證螺距組合式的輸送螺桿和振動包裝容器能夠使輸送過程的粉體變得密實。
[Abstract]:The development of modern industry is developing by leaps and bounds. In the field of packaging production, the development of powder packaging is maturing day by day. There are many problems in traditional powder packaging machinery, such as powder entrainment gas, dust pollution, low production efficiency and so on. Nowadays, under the new situation of environmental protection and mechanical automation and intelligentization, the traditional powder packaging machinery can no longer meet the packaging needs. Aiming at the problem of dense transportation of powder materials in packing and filling, this paper puts forward a method to solve the problem, designs the structural parameters and packaging technological parameters of the dense conveying device, and verifies the rationality of the structural parameters. Discrete element software is used to simulate the dense conveying of powder materials. The production status, mechanization degree and existing problems of traditional packaging machinery in powder packing industry are analyzed. The research status and research progress of powder filling packaging equipment and related fields at home and abroad are discussed. The concept and basic characteristics of powder materials studied are analyzed, and the characteristics of packaging materials, the causes and effects of entrainment gas of powder are analyzed in many aspects, which provides the basis for the proposal of dense conveying method of powder. According to the parameters design principle of the common screw, the packing production requirement of the density ratio and the screw conveying theory, the screw with screw distance combination is put forward, that is, the screw can be divided into the feeding section, the dense section, the exhaust section and the discharge section, which are divided into the feeding section, the dense section, the exhaust section and the discharging section. The main parameters of the dense conveying screw, such as the volume of the screw, the diameter of the screw blade, the pitch size, the diameter of the screw shaft, the density ratio and the driving power, are analyzed and calculated, and the solid modeling of the dense conveying screw is carried out by using the three-dimensional solid software. The strength and stiffness of dense conveying screw are analyzed theoretically, and the structural statics analysis and prestressed modal analysis of the designed dense conveying screw are carried out on the platform of ANSYS Workbench by using the finite element method. The stress-strain distribution, natural frequency and mode shape are obtained, and the distribution law is analyzed, so as to verify the rationality of the design of the main parameters. The discrete element method is used to simulate and analyze the movement process of powder in dense conveying screw and packaging container, which makes the movement state and transportation trajectory of powder particles visualize in the process of conveying. The changes of the mass flow rate of the powder were analyzed when the screw speed was 90 rpm, 100 rpm, 110 rpm and 120 rpm, respectively. The changes of powder velocity and motion density in different functional sections such as feeding section, dense section, exhaust section and unloading section of dense conveying screw are analyzed. After the powder is filled into the packaging container, the vibration compacting process of the powder is analyzed under different vibration amplitude and frequency. The simulation results, on one hand, verify the rationality of the design of the conveying screw parameters and provide guidance for the optimization of the structural parameters, on the other hand, verify that the conveying screw and the vibrating packaging vessel of the pitch combination can make the powder dense in the conveying process.
【學位授予單位】：江南大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB48

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