粉料定量大袋自动包装机设计及关键技术研究

发布时间：2018-04-24 21:44

本文选题：大袋自动包装机 + 模块化　；参考：《江南大学》2015年硕士论文

【摘要】：粉料定量大袋自动包装机是针对50Kg级粉末状或者颗粒状物料的包装机械,能够实现供袋、开袋、称量、下料、封口等包装过程的自动化,广泛应用于食品和化工包装行业。目前国内的大袋自动包装机主要依赖进口,一部分自行研制大袋自动包装机在实际使用过程中性能不稳定,真空吸袋时掉袋等问题普遍出现,影响生产效率。本文基于校企合作的横向项目,针对现有大袋包装机普遍存在的机械结构不合理、缺乏可靠性分析、真空吸附不稳定、控制系统落后等问题进行深入研究,并研发设计能够完成进袋、挑袋、夹袋、抱袋和缝包功能的大袋自动包装机。首先针对大袋自动包装机机械结构进行分析,根据大袋自动包装机的生产工艺流程将整个系统分为进袋系统、挑袋系统、夹袋系统、抱袋系统和缝包系统五个子系统模块,运用模块化的设计方法利用三维软件完成大袋包装机的机械结构设计。其次为提高粉料定量大袋自动包装机的可靠性,分析了其功能组成模块,并对各个子系统进行失效率预计和分析,综合计算出其可靠性指标——平均无故障时间;根据粉料定量大袋自动包装机的结构特点,完成其故障模式分析,并建立了完整的故障树模型,引入模糊故障树,把各个底事件发生的概率统一归一为三角模糊数,运用模糊故障树的分析和扩张算法,完成粉料定量大袋自动包装机机械本体的故障分析。然后针对真空吸袋不稳定的情况,研究大袋包装机吸袋装置对不同材料包装袋的吸袋能力。分析真空吸附装置的吸附原理,建立了真空吸附模型,分别对内衬编织袋、覆膜编织袋和纸塑复合袋三种包装袋进行吸取试验,记录气压变化情况。得到吸取不同编织袋时气压变化并不相同,引入包装袋的泄漏系数,并确定该三种包装袋的泄漏系数分别为0.192、0.089、0.042。根据泄漏系数和工作效率,吸取这三种包装袋时真空源气压区间应设定为59~64k Pa、70~75k Pa、66~71k Pa。最后针对大袋自动包装机实际使用过程中控制系统出现管线分布杂乱且易于损坏等问题,基于PROFIBUS-DP现场总线设计大袋自动包装机的控制系统,详细介绍了该控制系统的硬件结构及元器件的选型和软件实现流程,该控制系统具有很强的网络通信能力,为实现大袋自动包装机的智能化和远程监控提供了便利。
[Abstract]:Automatic packing machine for powder quantitative large bag is a packaging machine for 50Kg grade powder or granular material. It can realize the automation of packing process such as feeding, opening, weighing, discharging, sealing and so on. It is widely used in food and chemical packaging industry. At present, the domestic automatic packaging machine mainly relies on imports. Some of the self-developed automatic packaging machine in the actual use of the performance of instability, vacuum bag suction bag drop and other problems, affecting the efficiency of production. Based on the horizontal project of the cooperation between school and enterprise, this paper makes a deep research on the problems such as unreasonable mechanical structure, lack of reliability analysis, unstable vacuum adsorption, backward control system, etc. And developed and designed to complete the bag, pick bag, clip bag, bag holding and sewing bag function of the large bag automatic packaging machine. Firstly, the mechanical structure of the large bag automatic packaging machine is analyzed, and the whole system is divided into five sub-modules according to the production process of the large bag automatic packaging machine: the bag feeding system, the bag picking system, the bag clamping system, the bag holding system and the sewing package system. The mechanical structure design of large bag packing machine is completed by using three-dimensional software. Secondly, in order to improve the reliability of the powder quantitative large bag automatic packaging machine, the function component module is analyzed, and the failure rate of each subsystem is predicted and analyzed, and the reliability index, the average failure free time, is calculated synthetically. According to the structural characteristics of the powder quantitative large bag automatic packaging machine, the fault mode analysis is completed, and the complete fault tree model is established. The fuzzy fault tree is introduced, and the probability of the occurrence of each bottom event is unified into a triangular fuzzy number. Based on the fuzzy fault tree analysis and expansion algorithm, the fault analysis of the mechanical body of the powder quantitative large bag automatic packaging machine is completed. According to the instability of vacuum bag suction, the bag suction ability of bag suction device of large bag packing machine for different materials was studied. The adsorption principle of vacuum adsorption device was analyzed, and the vacuum adsorption model was established. Three kinds of packaging bags, including lined woven bag, coated woven bag and paper plastic composite bag, were carried out to record the change of air pressure. The leakage coefficient of the three kinds of bags was determined to be 0.192 0. 089% and 0. 042% respectively, and the leakage coefficient of the three bags was determined to be 0. 192%, 0. 089% and 0. 042% respectively. According to the leakage coefficient and working efficiency, the vacuum pressure range of vacuum source should be set to 594kPa7075k Pao 6671k Pa. when these three kinds of bags are absorbed. Finally, the control system of the automatic packaging machine is designed based on the PROFIBUS-DP field bus, aiming at the problems of the pipeline distribution and easily damaged in the control system of the large bag automatic packaging machine in the process of practical use. The hardware structure of the control system, the selection of components and the software realization flow are introduced in detail. The control system has strong network communication ability, which provides convenience for the realization of intelligent and remote monitoring and control of large bag automatic packaging machine.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB486

【参考文献】