基于PLC的上针管工位控制系统的改进与提高

上针管工位是自动化医疗器械注射针装配线上的一个重要工位,影响上针管工位针管装配质量的重要因素在于上针、合模、刮针动作的协调一致程度。全文在上针管工位上针、合模、刮针动作的协调一致上,进行了控制系统的改进设计。特别是在程序设计中,通过时间参数的设置,改善了机械位移动态特性对控制系统的影响。     

装配线上针管工位PLC控制系统的设计与实现

上针管工位是自动化医疗器械注射针装配线上的一个重要工位,影响上针管工位针管装配质量的重要因素在于上针、合模、刮针动作的协调一致程度。全文在上针管工位上针、合模、刮针动作的协调一致上,进行了控制系统的改进设计。特别是在程序设计中,通过时间参数的设置,改善了机械位移动态特性对控制系统的影响。     

采血针生产线分离送料部分的结构设计

介绍了采血针生产线上针座工位主要承担的针座分离、传送等功能。基于已得出的滑座分离结论,具体设计了上针座分离送料部分。     

基于PLC的弹药准备作业系统设计

讨论了弹药准备作业系统的设计,该系统由弹药清洗工位、弹药风干工位、防潮盖旋卸工位、称重工位、喷字和打标工位、储弹及分组工位等6个工位及自动传输线机构和电控系统组成;整个系统实现了自动传输、自动检测;控制系统采用了可变程序逻辑控制器(PLC)控制各工位和工作站,每一个工位都有自己的PLC控制系统,而总体也由一个PLC系统来控制,然后把信号输入工业计算机,由人在计算机上给出指令,处理数据,进行人机对话,实现了系统的自动化过程.     

汽车装配线工位器具的优化设计

在生产现场管理中，工位器具设计得是否合理、适用，在很大程度上影响着企业生产物流、现场作业环境及公司的整体形象。福田汽车集团诸城汽车厂原有两条装配线及相应配套的两个零部件库房，因原有工位器具在设计上仍存在着一定的不合理性，严重制约了装配现场作业环境的改善并影响到整个公司的形象。因此，公司将改进不适用的工位器具作为生产现场改善的一项重要工作进行了持续改善。     

PLC在电子燃油泵装配线中的应用

介绍了奥拓（ALTO）电子燃油泵（EKP）自动化的装配生产线工位一（油泵、滤油器、橡胶管装配检测工位）的基本结构，着重叙述了由松下（National）可编程逻辑控制器FP10SH组成的控制系统，并给出了设计实例。     

双工位换气包装机的微机控制

本文简要介绍了双工位换气包装机的工作原理，并根据其工作要求，设计了一套微机控制系统。     

PLC在数控车床转塔控制系统的应用

以CK7520数控车床转塔控制系统为例，阐述了采用PLC对多工位转塔刀架改造的设计，实现了工件通过一次装夹可自动完成全部工序的功能。     

转向节衬套压装推孔双工位机床控制系统的设计

分析了汽车前桥转向节衬套压装推孔生产方式,结合加工流程,设计了基于三菱PLC的自动转向节衬套压装推孔双工位机床控制系统。对电气控制系统和PLC软件流程进行分析,实践结果证明双工位机床运行效率高,安全可靠。     

基于PLC的多工位组合机床控制系统改造

采用可编程控制器（PLC）技术对卧式多工位组合机床进行改造,并根据生产工艺要求,将各工位及上下料有机地协调工作,提高了生产率和系统的可靠性。介绍了卧式多工位组合机床的工艺和控制要求,以及控制系统的软、硬件设计。     

Effects of needle response on spray characteristics in high pressure injector driven by piezo actuator for common-rail injection system

The common-rail injection systems, as a new diesel injection system for passenger car, have more degrees of freedom in controlling both the injection timing and injection rate with the high pressure. In this study, a piezo-driven injector was applied to a high pressure common-rail type fuel injection system for the control capability of the high pressure injector’s needle and firstly examined the piezo-electric characteristics of a piezo-driven injector. Also in order to analyze the effect of injector’s needle response driven by different driving method on the injection, we investigated the diesel spray characteristics in a constant volume chamber pressurized by nitrogen gas for two injectors, a solenoid-driven injector and a piezo-driven injector, both equipped with the same injection nozzle with sac type and 5-injection hole. The experimental method for spray visualization was based on back-light photography technique by utilizing a high speed framing camera. The macroscopic spray propagation was geometrically measured and characterized in term of the spray tip penetration, spray cone angle and spray tip speed. For the evaluation of the needle response of the above two injectors, we indirectly estimated the needle’s behavior with an accelerometer and injection rate measurement employing Bosch’s method was conducted. The experimental results show that the spray tip penetrations of piezodriven injector were longer, on the whole, than that of the solenoid-driven injector. Besides we found that the piezo-driven injector have a higher injection flow rate by a fast needle response and it was possible to control the injection rate slope in piezo-driven injector by altering the induced current.     

风电叶片模具液压翻转系统同步控制

选择以液压系统驱动方式实现大型叶片生产过程中的脱模、合模过程,并以数字PID控制技术为基础,对其同步控制策略进行了分析和仿真,为该技术的实际应用提供了理论支持。     

GDI喷油器针阀动力学特性研究

针阀动力学行为是影响GDI(汽油直接喷射式）喷油器工作稳定性和可靠性的关键因素。为了揭示不同参数对针阀动力学特性的影响机理,以某款GDI多孔喷油器为对象,依据针阀的受力特点建立了针阀动力学模型和GDI喷油器AMESim工作过程仿真模型,仿真分析了阀座锥角、阀座与钢球的接触方式、阀针运动质量等参数对针阀动力学特性的影响规律。结果表明：适当减小阀座锥角、增大阀座与钢球的接触面积、减小针阀运动质量可有效抑制开启或落座过程中针阀的振荡幅度。根据仿真分析结果对GDI喷油器的结构进行了综合改进,结果表明,结构改进后,GDI喷油器针阀的动力学特性得到显著改善。     

柴油机喷油阀碰撞分析

喷油器是柴油机燃油供给系统中实现燃油喷射的重要部件,然而在其工作中,针阀常与针阀体产发生碰撞,产生很大应力,针阀体工作寿命相当有限。以某款柴油机的喷油器为例,在CATIA中建立喷油器的三维模型,导入Hypermesh中进行模型的简化和网格的划分,利用Hypermesh和ABAQUS的接口,在ABAQUS的显式动力学有限元模块进行瞬态力学分析,模拟出喷油器中针阀与针阀体的碰撞过程,发现与应力波理论推导出的经验公式计算出的应力值基本接近。采用有限元方法对喷油器进行力学分析,有利于喷油器的改进设计。     

二甲醚发动机独立润滑喷油器工作特性研究

为考察二甲醚发动机独立润滑喷油器的工作特性,对其重要部件———针阀偶件的运动学进行分析,利用AMESim软件建立针阀运动的仿真模型,并对针阀的运动状况、喷油量、润滑介质的泄漏量等特性参数进行仿真分析,并对针阀升程及循环喷油量进行相关台架试验。结果表明,该喷油器的针阀运动状况、喷油规律等特性合理,润滑介质的泄漏量很小,对喷油器性能的影响可以忽略;仿真结果与试验结果的吻合度较好。     

A mathematical model for the prediction of the injected mass diagram of a S.I. engine gas injector

A mathematical model of gaseous fuel solenoid injector for spark ignition engine has been realized and validated through experimental data. The gas injector was studied with particular reference to the complex needle motion during the opening and closing phases, which strongly affects the amount of fuel injected. As is known, in fact, when the injector nozzle is widely open, the mass flow depends only on the fluid pressure and temperature upstream the injector: this allows one to control the injected fuel mass acting on the “injection time” (the period during which the injector solenoid is energized). This makes the correlation between the injected fuel mass and the injection time linear, except for the lower injection times, where we experimentally observed strong nonlinearities. These nonlinearities arise by the injector outflow area variation caused by the needle bounces due to impacts during the opening and closing transients [1] and may seriously compromise the mixture quality control, thus increasing both fuel consumption and pollutant emissions, above all because the S.I. catalytic conversion system has a very low efficiency for non-stoichiometric mixtures. Moreover, in recent works [2, 3] we tested the simultaneous combustion of a gaseous fuel (compressed natural gas, CNG, or liquefied petroleum gas, LPG) and gasoline in a spark ignition engine obtaining great improvement both in engine efficiency and pollutant emissions with respect to pure gasoline operation mode; this third operating mode of bi-fuel engines, called “double fuel” combustion, requires small amounts of gaseous fuel, hence forcing the injectors to work in the non-monotonic zone of the injected mass diagram, where the control on air-fuel ratio is poor. Starting from these considerations we investigated the fuel injector dynamics with the aim to improve its performance in the low injection times range. The first part of this paper deals with the realization of a mathematical model for the prediction of both the needle motion and the injected mass for choked flow condition, while the second part presents the model calibration and validation, performed by means of experimental data obtained on the engine test bed of the internal combustion engine laboratory of the University of Palermo.     

基于装配的注射模二维参数化CAD系统

介绍了在微机上开发的基于装配的注射模二维参数化ＣＡＤ系统。即从装配几何模型开始，采用参数化方法进行模具结构设计，最后由计算机输出模具装配图，零件图，的料清单等信息，提出了基于装配的模具设计框架，介绍了参数化图库管理及图形实例化操作和物料清单生成等关键技术。     

面向对象的生产系统反求及应用

采用面向对象的系统反求技术解决了濒临报废的复杂形状辊轮成形生产线多组辊弯模具设计与制造问题，取得了较好的经济效益。     

基于LS-DYNA的气动钉枪枪针组件的动态特性分析

利用非线性动力学分析软件LS - DYNA对气动钉枪枪针组件的工作过程进行了仿真分析,并采用动态数据采集系统对枪针工作过程中的动态应变进行了测量.将仿真分析结果与实际测得的数据进行对比,获得了较好的一致性,从而验证了仿真的有效性,为枪针结构的改进提供了依据.     

结晶器非正弦高频振动电液伺服控制系统的研究

开发了非正弦振动波形和计算机控制的电液伺服系统,用于提高拉坯速度和铸坯的表面质量,利用C语言和汇编语言编制了界面友好的计算机控制软件,推导了液压伺 服控制系统的数学模型。在半板簧结晶器振动试验装置上,模拟了小方坯连铸机的非正弦振动,研制的液压伺服控制系统响应速度快、控制精度高,完全满足了工业生产的要求。