水泥包装喷码机的技术改造

<正>为了提高喷码机的使用效率,我公司相关技术人员根据喷码机的工作原理和现场的工况了解,对喷码机进行了一些改造,并规范了一些日常的操作习惯,从而延长了使用寿命,保证了袋装水泥的正常出厂。1喷码机的工作原理喷码机的喷头由Φ0.2mm左右的孔阵组成,用来控制喷出墨点的大小和形状。在0.05~0.1MPa的压力作用下,油墨进入喷枪,喷枪内装有晶振器,通过振     

3150 Si／807喷码机在磷铵包装中的应用

Willett公司生产的3150Si/807喷码机属喷墨喷印机,它一般用来在无孔物(如塑料袋、塑料包等)表面喷印大中尺寸字符。我厂于1999年安装了2台喷码机,在成品岗位给已包装好的磷酸二铵包装袋上喷上标识。以下介绍我们使用3150Si/807型喷码机的情况。1　工作原理喷码机由光电检测管、控制器、气源、减压阀、墨水瓶、喷头等组件构成。当物体通过光电检测管时,光电检测管被触发后将信号送至控制器(控制器输出信号控制喷头内7个电磁阀的开启关闭),同时,气源将墨水瓶内带一定压力的墨水供给喷头,当控制器发出电磁阀打开阀门指令时,墨水喷出,射在…     

新型喷码机架的设计与应用

分析了滚轮式打码机与手持喷码机的不足之处,并结合生产现场的实际情况设计一款新型喷码机架,将喷头固定喷码机架上从而实现对纯碱大袋的自动喷码。     

尿素包装喷码系统改进总结

针对尿素包装喷码机设计和安装位置不合理、现场环境较差且粉尘多、主机箱密封效果差、主机易腐蚀损坏、喷码不清晰、喷头易堵、喷墨效果差、清洗喷头难度较大等运行中存在的问题,对影响喷码系统稳定运行的很多因素进行分析,提出了相应的改进措施。改进后,降低了喷码系统的故障率,保证了喷码字体的清晰度,提高了工作效率,节约了费用,经济效益显著。     

读者信箱

问：喷码机是如何分类的？在建筑陶瓷行业的应用情况如何？ 答：1喷码机简介喷码机是一种自动化在线式将产品的信息标注在产品（或包装）的表面的标识设备。喷码机分为连续供墨（CIJ）和按需供墨（DOD）。连续供墨系统就是平常所说的小字符喷码机,而按需供墨系统则是大字符喷码机和高解像喷码机。     

读者信箱

问:喷码机是如何分类的?在建筑陶瓷行业的应用情况如何?答:1喷码机简介喷码机是一种自动化在线式将产品的信息标注在产品(或包装)的表面的标识设备。喷码机分为连续供墨(CIJ)和按需供墨(DOD)。连续供墨系统就是平常所说的小字符喷码机,而按需供墨系统则是大字符喷码机和高解像喷码机。     

喷码机系统在油漆包装上的应用

介绍了喷码机技术的特点、工作原理 ,阐述了它应用在油漆包装上的系统配置和接合实际设计的控制方案     

基于ARM9的高解析喷码机喷印速度的控制

针对目前国内的高解析喷码机大多数采用单片机控制,不能满足现实生产对高喷印速度和大存储容量的要求。采用S3C2440微处理器和Windows CE操作系统组成的嵌入式系统开发平台来控制高解析喷码机。首先分析高解析喷码机系统的工作原理,然后研究SPI的数据传输特性,最后对高解析喷码机的喷印速度和影响喷印速度的主要因素的控制给出了控制算法,使喷印速度达到最优,生产效率最大化。     

基于磁制冷的FDM型3D打印机喷头的研究与设计

为了解决熔融沉积(FDM)型3D打印机使用过程中经常遇到的喷头堵塞问题,基于磁制冷技术,研究和设计了一种新型的3D打印机喷头。该打印机喷头的送丝机构,设计有压力传感器,可对导轮和挤出轮之间的压力进行数字化调节;喉管冷却组件采用高温导热油作为热交换介质,其冷却管采用沉浸式蛇管结构;基于磁制冷原理设计的制冷装置,配置有两条封闭循环的热交换液通道;喉管组件两端分别设置有耐高温的氟橡胶密封圈;喷头热端组件采用正的温度系数(PTC)加热器作为加热源,并设计有防热辐射保温罩。控制装置能够采用比例-积分-微分(PID)控制方式调节喉管组件的温度。研究表明,该喷头的上述设计特点,可有效地解决FDM型3D打印机工作时遇到的喷头堵塞问题,并能够提高模型的表面质量。     

喷头形状对离心静电纺丝电场影响的模拟分析

为研制更理想的纺丝喷头以提高离心静电纺丝效率及纺丝纤维质量,针对旋转盘式离心静电纺丝设备,使用有限元分析软件ANSYS模拟了不同形状纺丝喷头在相同加载条件下的电场分布。对现有O型喷头模拟了喷头高度、外端面直径以及喷头相对于底板高度的改变等对电场的影响,并对设计的新型E型喷头,模拟了喷头高度以及外端面弯曲程度对电场的影响。结果显示,当喷头高度值越小、外端面直径越小、距离底板越近、外端面弯曲程度越小时,喷头附近电场分布效果越理想。     

System Analysis of a DoD Print Head for Direct Writing of Conductive Circuits

The inkjet-printing principle is becoming more and more important for new applications besides conventional graphic printing. The target at our institute is to print conductive silver lines and areas of different widths and thicknesses. Based on a drop-on-demand (DoD) micro feeding system, a colloidal ink printer was developed to print conductive circuits. The printer has a stationary piezo-driven print head with a nozzle diameter of 100 μm. With such a nozzle, conductive paths with a width between 110 and 250 μm can be realized. A waveform generator is used to actuate the print head's piezo actuator. The most common control signal is a nearly rectangular voltage pulse. Shape, duration, and amplitude of the piezo control signal influence the stability of the printing process and thus the quality of the printed electrical structures significantly. Different rise and dwell times or pulse shapes can be considered to optimize the printing process. In this article, the piezo control signal's shape is analyzed, varied and the print head's system behavior is characterized. In a performance and signal analysis, the influence of the piezo input signal's shape on the transient behavior of the piezo output energy signal is identified. An optimized piezo control signal shall be achieved. In conclusion, a method is presented to measure droplet parameters such as radius, speed, and volume.     

基于硅硅低温直接键合的MEMS打印喷头制作工艺

针对一种MEMS压电式集成打印喷头复杂腔室结构的加工，提出了一套基于ICP刻蚀结合硅硅低温直接键合的制作工艺。首先通过ICP体硅干法刻蚀工艺分别制作了打印喷头的上下腔室结构，然后将带有上下腔室结构的两硅片进行低温直接键合，形成完整的打印喷头腔室。通过对打印喷头上下腔室结构的键合实验研究，进一步探索并验证了硅硅低温直接键合的机理，重点研究了不同活化方法和退火时间对复杂腔室结构键合质量的影响，优化了低温直接键合工艺，为带有复杂三维结构的MEMS器件的制作奠定了工艺基础。测试结果表明，制作完成的MEMS打印喷头具有较高的键合强度，且其腔室流道的完整性和密封性良好。     

基于虚拟仪器的多路炸药加热控制系统设计

设计了一套多路温度加热控制系统,该系统采用虚拟仪器LabVIEW作为上位机控制软件开发平台,下位机为智能化程序PID调节仪,通过RS485通信控制实现炸药加热控制.具有加热程序编程、温度、升温速率、升温时间设置以及温度采集、显示、打印、回放等功能,控制软件界面友好,满足用户要求.     

基于STM32的直流电机PWM调速系统

为实现对永磁直流电机转速准确、快速、稳定地控制,提出积分分离PID与变参数PID相结合的控制算法,设计并实现了直流电机PWM调速系统。详细阐述了直流电机调速的工作原理、积分分离PID与变参数PID控制算法和系统的软硬件设计。以STM32为主控芯片搭建控制平台验证调速系统的性能,实验结果表明:该系统达到了优良的调速性能,与经典PID控制算法相比有更快的响应速度和更好的稳定性。     

密炼机智能控制上位机系统的软件设计

论述了密炼机智能控制上位机系统的软件设计思路,介绍了上位机系统的常用功能模块。该系统是在Ｗｉｎｄｏｗｓ ＮＴ４ ．０ 的环境下,用Ｄｅｌｐｈｉ３．０ 语言开发的。系统实现了实时监控多台下位机系统的工作状态,并具有远程控制功能;同时可向下位机系统采集历史数据,还可对历史曲线图进行多种类型的查询和打印。     

小白菜-土壤系统中Pb、Cr、Cd迁移的研究

重金属被土壤作物吸收后,通过食物链的传递和富集,最终危害人体健康。以西安市城北郊区蔬菜生产区为研究区,通过在典型样地的隔离体中种植小白菜,在不同生长阶段观测小白菜生长的环境土壤中0～70 cm内每10 cm土层中重金属含量变化。结果表明,污灌区土壤中Cd的含量平均值为11.8 mg/kg〉0.3 mg/kg,超出标准值。土壤重金属的累积已经导致重金属在小白菜体内的累积,小白菜中Pb含量的最大值0.82 mg/kg,则远远超出了无公害蔬菜的标准值0.2 mg/kg。小白菜对三种重金属吸收能力的顺序是：Pb〉Cr〉Cd。小白菜对土壤中重金属的吸收、对土层中重金属的迁移能力影响最大的是在20～30 cm深的土层处。     

基于GPRS的油库无线远程监控系统的设计

设计了一种基于GPRS技术的油库监控系统,以西门子S7-300作为下位机的控制系统,主要负责油库相关数据的采集以及控制命令的发出等.采用组态王6.55作为上位机系统为工作人员提供友好的操作平台,完成实时监控、数据存储、查询、报表、打印以及故障诊断等功能,该系统大大地提高了油库自动化管理水平.     

A comprehensive study on the droplet formation processes and its influencing factors of a tubular piezoelectric print head

Abstract

Various inks with different properties are widely used in the printed electronic industry. In order to obtain high quality inkjet printing, it is necessary to study the droplet formation process and its influencing factors comprehensively. Only in this way, the incentive conditions and liquid physical parameters of droplet ejection can be obtained and optimized. Firstly, the calculation model of the droplet ejection process is established for a tubular print head and the boundary conditions are set according to the driving characteristics. Secondly, the free surface flow is calculated in the simulation software and sequential pictures of the droplet formation processes are captured to validate the availability of the numerical algorithm. Finally, the droplet formation processes of the tubular piezoelectric print head are simulated under different incentive conditions, different viscosities and different surface tensions. Too small a driving energy is insufficient to cause the head to eject droplets. Excessive excitation energy will result in larger or multiple satellite droplets. Additionally, the thinning process of the liquid neck is examined carefully in this paper. Results show that surface tension and viscosity have a significant effect on the thinning speed of the liquid neck, but the effect is not as significant as previous studies.     

Tailoring the properties of deposited thin coating and print features in flexography by application of UV-ozone treatment

Printed functional materials are a rapidly growing area of interest for low-cost high-speed device manufacture with flexographic printing seen as a route to achieving this. The relationship between surface tension of the ink and surface free energy (SFE) of the photopolymer plate is a key for optimum performance. However, traditional methods of surface tension modification of the ink/coating often cannot be employed for functional inks. In this research, rapid, permanent modification of flexographic printing plate’s SFE is achieved through controlled UV-ozone treatment, and the effects of the treatment on the polar and dispersive component of SFE are analyzed by Fourier transform infrared attenuated total reflectance spectroscopy, swelling experiments, and roughness measurements. Printing trials using the modified printing plates reveal improved print uniformity and control of deposited ink layer thickness, as well as improved print features—particularly track and pad junctions which can be problematic for printed electronic applications. The ability to rapidly tailor printing plate SFE is of benefit to all volume printing applications. Furthermore, it is of critical importance for functional printing and printed electronics where surface tension of the ink is determined by the functional material and chemical modification is not possible or desirable.     

污泥干化装置控制系统的设计与实现

以某投产运行的污泥干化系统为研究对象,基于S7-300 PLC设计处理量为150t/d(湿基,水含量约80%~90%)的桨叶干燥机污泥干化控制系统,给出了控制系统的网络结构、启停控制逻辑流程的实现、安全保护系统的方案和人机界面的实现。