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負壓式生鮮食品包裝機關(guān)鍵部件設計與試驗研究

發(fā)布時間:2018-08-24 18:54
【摘要】:本文在分析研究國內(nèi)外大量生鮮食品包裝機械研究和應用現(xiàn)狀的基礎上,提出了適應中國市場的負壓式生鮮食品包裝機包裝工藝及整機方案,重點研究生鮮食品包裝機的輸送裝置、切斷機構(gòu)和橫封裝置的工作原理和技術(shù),實現(xiàn)生鮮食品的高速、高質(zhì)量包裝。主要研究內(nèi)容及結(jié)論如下:(1)根據(jù)我國生鮮食品包裝機械現(xiàn)狀,提出了負壓式生鮮食品包裝機的設計要求以及技術(shù)參數(shù),并對包裝工藝進行了分析。確定了負壓式生鮮食品包裝機整機結(jié)構(gòu)以及工作原理,根據(jù)生鮮食品包裝機的傳動要求,對包裝機的傳動系統(tǒng)進行了設計研究,并對各個機構(gòu)傳動的關(guān)鍵參數(shù)進行了計算。(2)對包裝機輸送裝置進行了仿真與試驗研究,通過壓縮試驗和ANSYS有限元仿真分析了輸送裝置對包裝盒壓縮變形的過程及機理,分析了包裝盒的易損傷位置及原因。并通過正交試驗,確定最佳參數(shù)組合,在包裝盒及生鮮食品不壓縮受損的同時,保證PET包裝盒和輸送裝置有較好的輸送同步性。(3)研制了基于凸輪連桿式的包裝機切斷機構(gòu),應用ADAMS建立了切斷機構(gòu)的參數(shù)化模型,對其進行運動學分析和仿真模擬,得到該機構(gòu)主要參數(shù)變化對機構(gòu)運動的影響規(guī)律。通過二次規(guī)劃算法優(yōu)化分析計算,得出一組最優(yōu)參數(shù)組合,此參數(shù)條件下切刀的加速度最大值為7971 mm/s2,切割距離為20.4 mm,滿足切斷機構(gòu)工藝需求。利用此參數(shù)組合的運動學仿真分析表明,下切刀的加速度最大值為7971 mm/s2,切割距離為20.4mm。試驗樣機對多種厚度的PVC保鮮膜切斷率都在98%以上,切斷機構(gòu)滿足生鮮食品包裝機作業(yè)要求。(4)設計了一種基于負壓原理的生鮮食品包裝機橫封裝置,橫封裝置采用負壓吸膜方式實現(xiàn)橫封作業(yè),裝置主要由前吸風盒、切斷器、后吸風盒和輥子輸送機為主要部分組成。對橫封裝置裹膜過程中的動力學特性進行了分析,應用FLUENT進行后吸風盒流場研究。通過樣機正交旋轉(zhuǎn)組合試驗進行影響因素的回歸方程顯著性分析,并通過MATLAB優(yōu)化得出裝置最佳的結(jié)構(gòu)和工作參數(shù),橫封率為99.5%,回歸方程式可較好的分析和預測橫封裝置的性能。(5)通過負壓式生鮮食品包裝機樣機試制以及試驗研究,樣機對于生鮮食品的包裝速度為49.4包/min,包裝率為99.4%,鼓包率為5%,基于負壓式原理的負壓式生鮮食品包裝機,達到了設計要求和預期目標。
[Abstract]:On the basis of analyzing and studying the research and application status of a large number of fresh food packaging machinery at home and abroad, this paper puts forward the packaging technology and the whole machine scheme of the negative pressure fresh food packaging machine adapted to the Chinese market. The working principle and technology of the conveying device, cutting off mechanism and transverse sealing device of fresh food packaging machine are studied in order to realize the high speed and high quality packaging of fresh food. The main contents and conclusions are as follows: (1) according to the present situation of fresh food packaging machinery in China, the design requirements and technical parameters of negative pressure fresh food packaging machine are put forward, and the packaging technology is analyzed. The structure and working principle of the negative pressure fresh food packaging machine are determined. According to the transmission requirements of the fresh food packaging machine, the transmission system of the packaging machine is designed and studied. The key parameters of the transmission of each mechanism are calculated. (2) the simulation and experimental research on the conveying device of the packaging machine are carried out. The process and mechanism of the compression deformation of the packaging box are analyzed by compression test and ANSYS finite element simulation. The easily damaged position and reason of packing box are analyzed. Through orthogonal test, the best parameter combination is determined, while the packing box and fresh food are not compressed and damaged, the PET packing box and conveying device are guaranteed to have good transport synchronism. (3) the cutting mechanism of packaging machine based on cam connecting rod is developed. The parameterized model of the cutting mechanism is established by using ADAMS. The kinematics analysis and simulation are carried out, and the influence of the main parameters of the mechanism on the motion of the mechanism is obtained. Through the optimization analysis and calculation of quadratic programming algorithm, a group of optimal parameter combinations are obtained. The maximum acceleration of the cutter is 7971 mm/s2, and the cutting distance is 20.4 mm, under this parameter condition, which meets the technological requirements of the cutting mechanism. The kinematics simulation results show that the maximum acceleration of the cutter is 7971 mm/s2, and the cutting distance is 20.4mm. The cutting rate of PVC film with various thickness is above 98%, and the cutting mechanism can meet the requirements of fresh food packaging machine. (4) A kind of transverse sealing device of fresh food packaging machine based on negative pressure principle is designed. The transverse sealing device adopts the negative pressure suction film method to realize the transverse sealing operation. The device is mainly composed of the front suction box, the cut-off device, the rear suction box and the roller conveyor. The dynamic characteristics of the transverse sealing device during the process of film wrapping were analyzed and the flow field of the rear suction box was studied by using FLUENT. The regression equation of the influencing factors was analyzed by orthogonal rotating combination test of prototype, and the optimal structure and working parameters of the device were obtained by MATLAB optimization. The horizontal sealing ratio is 99.5, and the regression equation can better analyze and predict the performance of the transverse sealing device. (5) the prototype of the negative pressure fresh food packaging machine is trial-produced and the experimental research is carried out. The packaging speed of the prototype for fresh food is 49.4 / min, the packing rate is 99.44.The packing rate of drum is 5. The negative pressure type fresh food packaging machine based on the principle of negative pressure has achieved the design requirements and expected objectives.
【學位授予單位】:中國農(nóng)業(yè)大學
【學位級別】:博士
【學位授予年份】:2017
【分類號】:TS206.5

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