本文選題：集裝袋　切入點：給料　出處：《天津科技大學》2015年碩士論文

【摘要】：顆粒狀物料集裝袋自動定量充填系統(tǒng)是用于將顆粒狀物料按要求自動定量充填到集裝袋的一種包裝設備,在食品、化工等行業(yè)有著廣泛應用。本文通過對系統(tǒng)的工作過程進行分析,結合已有系統(tǒng)的性能特點,提出了設計系統(tǒng)應該具備的功能。最后設計了安全性高、結構簡單、自動化程度高的稱重下置式的顆粒狀物料集裝袋定量充填系統(tǒng),并利用Pro/Engineer創(chuàng)建了系統(tǒng)結構的三維模型。系統(tǒng)的給料機構采用料門式給料,結構簡單可靠、調整容易,可以實現(xiàn)顆粒物料的粗、精兩級自動給料從而保證充填精度。下置的稱重機構用來支撐集裝袋的底面從而稱量袋內顆粒物料的質量,同時配有升降機構,能夠在充填時自動向上運動支撐集裝袋,在充填完畢后能夠自動下降脫離與袋的接觸,以方便袋的運離。自動壓袋機構可以受控制自動將集裝袋進料口的緊壓在導料筒上,以防止進料口脫離,并在完成充填后自動松開壓袋。采用掛鉤可以向外90度自動翻轉的掛袋機構來掛集裝袋的吊耳,防止充填過程中集裝袋疊在一起,并在充填完畢后可以自動脫鉤。整個掛袋和壓袋機構及導料筒都通過內支架由稱重機構的稱重托盤支撐與給料機構不直接接觸,從而減少了干擾因素對稱重精度的影響。利用離散元法借助PFC3D軟件仿真計算了稱重托盤受到顆粒物料的沖擊力,利用ANSYS/WORKBENC H軟件對稱重托盤進行了動力學和靜力學分析,得到了其模態(tài)特征以及在額定載荷作用下的應力與應變等,同時分析了在沖擊力作用下的瞬態(tài)動力學動態(tài)響應等,分析結果顯示結構設計可靠。對稱重機構中的升降機構進行了受力分析,確定了工作時所需的驅動力,同時利用ANSYS進行了結構有限元分析。利用離散元法借助PFC3D軟件仿真計算給料機構中料門受顆粒物料的作用力,對得到的結果進行了分析,確定了料門打開所需的作用力,確定選擇的驅動氣缸能夠滿足需求。研究了影響系統(tǒng)包裝精度和速度的因素,提出了提高包裝精度的有效措施,詳細闡述對系統(tǒng)延時和空中料柱的預測補償與選擇最優(yōu)兩級給料切換點這兩種提高包裝精度的措施。設計了系統(tǒng)基于PLC的控制系統(tǒng),控制系統(tǒng)可以根據(jù)得到的重量信號按照系統(tǒng)設定自動控制各執(zhí)行機構動作。
[Abstract]:The automatic quantitative filling system of granular material packing bag is a kind of packing equipment which is used to automatically fill granular material into container bag according to requirement. It is widely used in food, chemical industry and so on.Based on the analysis of the working process of the system and the performance characteristics of the existing system, the functions of the design system are put forward in this paper.Finally, a quantitative filling system with high safety, simple structure and high degree of automation is designed, and the three-dimensional model of the system structure is created by using Pro/Engineer.The feeding mechanism of the system adopts the feedstock gate type feed, the structure is simple and reliable, the adjustment is easy, can realize the coarse and fine two-stage automatic feeding of the granular material to ensure the filling accuracy.The lower weighing mechanism is used to support the bottom surface of the container bag so as to weigh the quality of the granular material in the bag, and is equipped with a lifting mechanism, which can automatically move upward during filling to support the container bag,After filling the bag can automatically drop off contact with the bag to facilitate the bag removal.The automatic bag pressing mechanism can be controlled to automatically press the inlet of the container on the guide tube to prevent the inlet from leaving, and to release the bag automatically after the filling is completed.The hooks can be used to hang the hooks of the container bags, which can be turned out 90 degrees automatically, so as to prevent the stacks from stacking together in the filling process, and can be automatically decoupled after filling.The whole bag and bag pressing mechanism and the guide tube are supported by the weighing pallet of the weighing mechanism without direct contact with the feeding mechanism through the inner support thereby reducing the influence of the interference factors on the symmetrical weight accuracy.By using discrete element method and PFC3D software, the impact force of the weighing pallet is calculated, and the dynamics and statics of the symmetrical weight tray are analyzed by using the ANSYS/WORKBENC H software.The modal characteristics, stress and strain under rated load are obtained, and the transient dynamic response under impact force is analyzed. The results show that the structure design is reliable.The lifting mechanism in the symmetrical weight mechanism is analyzed, and the driving force is determined. At the same time, the finite element analysis of the structure is carried out by using ANSYS.The discrete element method is used to simulate and calculate the force of the grain material acting on the door of the feed mechanism with the help of PFC3D software. The results obtained are analyzed, the force required for the opening of the material door is determined, and the selected driving cylinder can meet the demand.This paper studies the factors affecting the system packaging accuracy and speed, puts forward effective measures to improve the packaging accuracy, and expounds in detail the two measures to improve the packaging accuracy, namely, system delay, prediction and compensation of the air feeding column and selection of the optimal two-stage feed switching point.The control system based on PLC is designed. The control system can automatically control the actions of each executing mechanism according to the system setting according to the weight signal.
【學位授予單位】：天津科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB486

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