基于现场总线的铜鼓风炉配料控制系统

根据铜鼓风炉配料系统的特点,对块状物料选用料斗秤静态计量,湿粉状物料采用全悬浮式的电子皮带秤动态计量.在此基础上建立起分布式现场总线控制系统,选用性价比高的SIEMENS PLC作为主控制站,由PLC控制给料设备,利用PROFIBUS-DP总线技术将分布的设备连成整体,采用组态软件对系统进行实时监控,实现了微机自动控制...     

电子料斗秤常见故障及维护技巧

随着电子技术的发展,电子秤在国民经济的各个领域得到了广泛的应用,如电子料斗秤、电子皮带秤、电子汽车衡、电子吊钩秤、动态电子轨道衡秤。这些电子秤在计量管理、物料成本消耗、产品质量过程控制等方面起着重要作用。下面结合自身工作,重点介绍电子料斗秤的构造、原理、常见故障以及日常维护。     

电子料斗秤常见故障及排除

随着电子技术的发展,电子秤在各行各业中起到了至关重要的计量作用。在韶钢工艺生产过程中,电子秤是不可缺少的设备,如电子料斗秤、电子皮带秤、电子汽车衡、电子吊钩秤、自动轨道衡等等。这些电子秤在计量管理、物料成本消耗、产品质量等方面都起着非常重要的作用。本文重点介绍电子料斗秤的构造、原理、常见故障以及日常维护。     

皮带秤实物标定电子料斗秤的研制

电子皮带秤在使用中易受皮带、环境、温度等诸多因素的影响，使其精度下降。为确保皮带秤的使用精度及计量数据准确，可靠，必须经常对其调零、校验和实物标定，本文对该公司研制的实物标定料斗秤的技术要求，设计方案及使用情况予以了介绍。     

移动式电子料斗秤在核子皮带秤实物标定中的应用研究

通过用移动式电子料斗秤对核子皮带秤标定过程的研究,该方法不仅能消除中间误差,确保核子秤的计量准确性,而且在降低劳动强度、提高工作效率和解决现场操作困难等方面都有良好效果。     

料斗设计中应注意的若干问题

料斗是料斗秤、实物校验装置等斗式计量设备中重要的储料装置。本文通过作者多年的设计与生产实践，提出了料斗设计中应考虑的几个问题。     

连续累计自动衡器(皮带秤)测量结果的不确定度分析与评定

采用电子料斗秤作为控制衡器对连续累计自动衡器进行物料试验,对计量过程中不确定度来源进行分析,得到测量结果不确定度的评定模型,给出合成不确定度和扩展不确定表示公式,从定量的角度分析电子皮带秤的计量性能。通过应用实例验证模型的实用性和有效性。     

瑞士哈斯勒公司VHRS皮带秤

我院在工程设计中引进了五台瑞士哈斯勒(HASLER)公司电子皮带秤。该公司是开创(K—TRON)跨国集团公司的一家子公司,主要从事动态称重产品的生产,重点产品有皮带秤、冲量流量计、固体物料质量流量计、皮带称重给料机、料斗秤配料系统、失重式给料机秤、磨机电耳等。哈斯勒公司的皮带秤类产品有单托辊秤、多托辊秤、烟草工业用     

一种非连续累计皮带秤的工作原理

非连续累计皮带秤是一种以输送机式承载装置结构为基础的新概念皮带秤,工作在非连续累计模式,既保留了皮带秤结构简单紧凑的优势,又具备料斗秤称量准确的优势。本文详细阐述了这种衡器的工作原理,简要介绍了其非连续累计、定量控制装载、流量控制等工作模式的功能特点,提出了这类产品的技术标准的要点,预期将来在散料称重应用领域占一席之地。     

实物校验装置的设计商讨

实物校验装置是一种高精度的定量料斗秤,具有可以自动标定的、附有标准砝码的自动挂码系统,可对电子皮带秤、核子皮带秤进行以精度标定和校验。本文就装置的系统设计要点予以商讨。     

模块式计量托辊在电子皮带秤的应用研制——也谈电子皮带秤动态计量节能创新

为简化秤体结构,降低安装和维护工作量,提高皮带秤的整体称量准确性,是当前电子皮带秤技术的攻关方向之一.采用模块式计量托辊简化电子皮带秤的结构设计,简化电子皮带秤的结构和安装设计,减少安装与维护工程量,是皮带运输物质动态计量的结构简化与节能创新,有利于满足安装维护简单方便的使用需求.     

利用高科技手段遏制电子汽车衡作弊

电子汽车衡作为大宗物料称重结算的工具,已广泛应用于国民经济的各个领域,而衡器使用的用户在实际工作中遇到的各种作弊行为花样百出,利用遥控装置作弊的行为更是让人防不胜防。本文笔者着重介绍在实际工作中遇到的利用高科技的各种电子汽车衡遥控作弊现象,预防电子汽车衡遥控作弊的方法,以及探讨开发一种利用高科技手段能够有效防止电子汽车衡作弊的仪器设备。     

电子汽车衡称量误差分析

随着广东韶钢松山股份有限公司的不断发展,每年通过进出厂汽车衡和厂内中转汽车衡计量的能源物资也随着大量增加。目前在用进出厂汽车衡7台,厂内中转汽车衡8台,这些汽车衡计量性能如何,其称量误差是否满足法制计量的要求,不仅影响到本厂物资计量数据是否准确,也将会影响到客户对韶钢计量管理水平的评价。下面,本人主要根据电子汽车衡的检定项目来分析电子汽车衡的称量误差。     

实物检验装置在韶钢电子皮带秤中的应用

皮带秤是安装在皮带输送机的适当电子位置上,对散状物料自动进行快速、连续、累计称量的计量器具。当前,我公司计量皮带秤主要分布在原料厂、烧结厂、焦化厂、炼铁厂。电子皮带秤的计量准确度高低关系着公司铁前物料成本消耗的考核与结算,因此做好电子皮带秤的日常维护校准工作显得尤为重要。下面结合本人多年来从事皮带秤维护检定工作,浅谈实物校验装置在韶钢焦化C206电子皮带秤日常校验中的应用及效果。     

皮带秤控制衡器选择法剖析

皮带秤技术法规对称量试验物料的控制衡器规定了原则要求，本文对控制衡器如何满足此要求进行了深入分析，并通过实例予以进一步诠释，指出即使检定合格的非自动衡器一般也不可能在其全量程范围内都满足控制试验物料规定误差的要求，硬性强求是不必要的，也是做不到的。Ⅲ级非自动衡器若不在物料试验之前立即校准或检定，不能作为0．5级和0．2级皮带秤的检定用控制衡器；但只要做到即时校准，就有可能满足检定0．5级和0．2级皮带秤控制衡器的要求。     

Analysis of the friction and wear behavior of hot work tool scale: application to the hot rolling process

In hot forming processes, the interface tool/product is important for the quality of the finished product. In hot rolling, the scale formed on the roll material plays an essential role. As soon as the contact oxide–oxide is established between the roll and the slab, friction allows the process to start. However, the oxide scale will continue to grow under the cyclic action of hot contacts and water cooling and will be subjected to thermo-mechanical stresses. Beyond a certain critical thickness, the oxidized surface layer of the cylinders has not sufficient mechanical strength to withstand the shear stresses.

The wear and friction behavior of the oxides appearing on the surface of the hot working rolls is not well known. The influence of these oxides on the friction and, consequently, the quality of the products of finishing mills, seems very significant. So, in this study, we investigate the evolution of the friction coefficient and the wear, according to the growth, the nature and the thickness of the formed scale. We use a high temperature pin on disc tribometer. The pin consists of material “rolls” while the disc consists of the slab. The pin is instrumented with thermocouples in order to couple the friction coefficient measurements with the thermal gradient in the pin and the surface temperature and the formed oxides. Then, the characterization of the surfaces is done by scanning electronic microscopy (SEM) and EDS analyses. We use the method of sin² Ψ to evaluate residual stresses of oxide and correlate these data with shear stress behavior.     

Fabrication of micro-channel arrays on thin stainless steel sheets for proton exchange membrane fuel cells using micro-stamping technology

Bipolar plates are one of the crucial components of proton exchange membrane fuel cells. Because of the expensive production costs of traditional graphite bipolar plates, which require a few millimeters thickness over the space, the resulting metal bipolar plate reduces the cost, and the thickness can be reduced to the micron range. This study explored the application of micro-stamping technology to produce thin metal bipolar plates with the relevant process parameters. In this study, the channel design was 0.8?×0.75 mm for the use of a rigid punch on a 50-μm-thick stainless steel sheet (SUS 304) for micro-channel stamping processes. The finite element method and the experimental results were used to analyze the main parameters of the micro-stamping process. The traditional material model and the scale factor modified material model were used for simulation. The experimental results verified that the modified material model is more realistic for products and has superior similarity because the punch load is relatively small. This study used updated Lagrangian formulation concept to establish an elastic–plastic deformation finite element analysis model and scale factor to modify the calculation to effectively simulate the micro-stamping process for metal bipolar plates.     

Evaluation of micro-drilling technologies for metal-injection-molded 420 stainless steel

Metal-injection-molded (MIM) 420 stainless steel is a commonly used material for high-value products such as fuel injector nozzles. However, the trade-offs involved in using different micro-drilling processes on this material are not well-documented in literature. This article presents a micro-drilling study of MIM 420 stainless steel using four candidate processes: micro-electrical discharge drilling (micro-EDD), ultrasonically assisted micro-EDD, micro-mechanical drilling (micro-MD), and ultrasonically assisted micro-MD. The micro-EDD results shows that the use of ultrasonic vibrations significantly improves the overall process time, spark erosion efficiency, and material removal rate of the process. However, this improvement comes at the expense of increased tool wear and surface roughness, especially while machining under high-discharge-energy conditions. The micro-MD results show that the use of ultrasonic vibrations is beneficial in lowering the thrust force, drilling torque, and tool wear at chipload values greater than the minimum chip thickness of the material. However, the ultrasonic vibrations do not have a notable effect on the surface roughness or on the size of the exit burrs. The results obtained from this study have been used to develop a Likert-type comparison scale to enable application-specific selection of micro-drilling processes for MIM 420 stainless steel.     

Multi-scale polymer properties with applications to solid lubricants in ironing

The use of polymer laminated steels have received significant interest from the can-making industry as a potential base material, mainly due to environmental benefits and excellent solid lubrication properties. Internal corrosion prevention is also very important with food cans. Previous research has experimentally and mathematically analyzed this material, but the mechanical properties, especially the shear strength, of the polymer coating is difficult to obtain given its very small thickness. This paper obtains predictions of polymer coating strength through two approaches: a millimeter-scale approach based on a mathematical model of ironing, and a sub-micrometer scale approach based on asperity plowing with an atomic force microscope. Once piezo-strengthening effects are accounted for, the polymer strength predictions from the two methods are very close.