基于J2EE分布式多层电子政务的研究和开发

【作者】 孙杰；

【导师】 林红桔；

【作者基本信息】 天津工业大学 ， 计算机应用技术， 2005， 硕士

【摘要】 本文针对现有三维多剑杆织机的织边机构进行了研制,并且对其工业化应用进行了设备的改进和控制系统的开发。 在织边机构的研究过程中,首先提出了三个备选方案,通过实验对其进行了论证,最终采用了针织套圈方式来进行三维织物边部的织造。根据现有织机机构特点,边部机构中设计了引纱针与钩边针配合运动来实现针织锁边,这两部分装置都采用气动驱动,气缸型号根据机构的要求和条件选择,执行元件均由电磁阀控制,与织机整体很好地融合在一起。 机构研制完成后,对不带夹层的多层平纹双经接结织物进行了试织,使用了六根剑杆同时引纬,采用普通高特化纤纱作为经纬纱,分别织造了矩形截面和T形截面织物。通过分析可以看出,织造的机织预制件结构紧密、整体性好,在织造过程中由于引入双纬使得生产效率提高,尤其是其边部结构紧密平整,利于预制件的复合固化。 为了使三维多剑杆织机能够应用于工业生产中,本课题对其现有的开口、引纬、织边、打纬、织物引离、送经机构进行了大量的改进,增加了织机的实用性和美观性。在机构改进的同时也对织机的控制系统做了开发,改由输入输出卡+计算机控制方式为PLC+计算机控制,选用了西门子S7-300可编程控制器,具有可靠性高、抗干扰能力强、功能完善、适应性好和应用灵活等优点。计算机作为PLC的上位机,其内设计了一套完整的CAD&CAM系统软件,该系统功能全面、界面友好、操作简便。CAD技术的核心为计算机辅助设计和织物截面交织规律的真实感模拟。CAM技术的核心是主控计算机通过系统功能模块传送信号、控制和检测织机运行。 通过本课题的研究,使三维机织物的织造实现了自动化生产和集中管理,在纺织结构复合材料的生产上迈进了一步。更多还原

【Abstract】 In this paper, the selvage apparatus on 3-D multi-rapier loom is developed, and improvement on machine and the development of control system is investigated for industrial application.In the research of the selvedge apparatus, three schemes are brought forward and analyzed through experiment; finally the knitting method to perform the selvage of 3-D fabric was employed. According to the characteristic of 3-D loom in existence, leading-yarn needle and crochet hook is designed in the selvedge apparatus to realize the selvedge by using the knitting method. They are all driven by high pressure air cylinders with different models, which are chosen based on the demand of various moving parts. The apparatus element is controlled by electromagnetic valve, so it can syncretize very well with the loom.Multi-layer tabby fabric is woven after the development of the mechanism. Six rapiers are used in the weaving practice, chemical fiber yarn with greater tex value is used as the warp and weft. The fabrics with rectangle and "T" sections are woven. It can be seen through analyzing the fabrics: the woven preform is compact and unitary; in addition, the weaving efficiency is high because of the twin-weft insertion technology; Especially the structure of the selvage is very compact and level, it’s ideal for fabricate the preform.The research also conducted improvement on the shedding, weft delivery, selvage formation, beating-up, take-up, and let-off motions in the 3-D loom. The improvement makes the loom more practical and graceful. At the same time, control system of loom is developed. It adopts PLC (Programmable Logic Controller) and computer instead of I/O card and computer. New system employs SIMATIC S7-300 PLC, featuring high reliability, strong anti-jamming, perfect function, good flexibility. As advancer of PLC, computer has a CAD&CAM system software. This system has universal function and friendly interface, especially the operation is simple. The core of CAD is computer-aided design and profile modeling of 3-D fabrics’ interlaced discipline. The core of CAM is that computer transmits signal to loom to check andcontrol the weaving process via function module of system.In virtue of this thesis’ research, the weaving of 3-D fabric gains automatic production and concentrative management. The research work promoted the manufacture of texitile structural composite.更多还原