高速电梯用钢丝绳直径均匀性控制

随着高速电梯市场不断扩大,对高速电梯用钢丝绳质量要求也不断提高,尤其针对高速电梯的抖动、舒适感和高速电梯用钢丝绳疲劳寿命要求。高速电梯用钢丝绳直径均匀性及其与曳引轮轮槽的匹配是影响电梯抖动、舒适感和钢丝绳疲劳寿命的关键因素。从绳芯纱条制作、配纱、过程控制三方面着手,对改进绳芯直径、钢丝绳工装夹具设计和过程控制方面进行阐述,进一步提高高速电梯用钢丝绳直径均匀性、过程能力指数和疲劳寿命,达到可预期的效果。     

金属绳芯早期失效原因分析及改进

对钢丝绳绳芯早期失效原因进行分析 ,认为失效的主要原因有 :绳芯内外层股受力不均匀 ,绳芯钢丝与钢丝绳主股外层丝直径相差较大造成使用中的磨损程度不同 ,金属绳芯储油能力低 ,钢丝绳受轴向周期性载荷 ,钢丝绳中钢丝间接触应力过大造成裂纹源等。可通过提高绳芯钢丝强度、增大绳芯捻距 ,采用合适结构的绳芯 ,改善润滑效果和采取涂 (填 )塑工艺等措施来改善绳芯质量和寿命     

电梯钢丝绳生产及对耐疲劳性能的影响

介绍钢丝绳更换并报废的原因,从制绳钢丝的表面质量及组织、钢丝绳结构的选择、钢丝绳油脂的选择、钢丝绳涂油方法及涂油量、绳芯的选择、钢丝绳捻制质量、钢丝绳预张拉技术的使用、生产过程钢丝表面的意外损伤、生产工艺控制等方面,对设计、制造过程中影响电梯钢丝绳耐疲劳性能的主要因素做了分析,并提出了相应的应对措施。强调工艺参数设计与过程控制对钢丝绳耐疲劳性能有至关重要的影响,并对过程控制中的重点因素做了介绍。     

OTIS电梯用钢丝绳的生产工艺研究

介绍OTIS电梯用钢丝绳的生产过程、工艺设计、生产过程控制和技术参数制订,以8×19S结构钢丝绳为例,结合国内电梯钢丝绳标准GB 8903—1988,并参照OTIS电梯用钢丝绳的特殊性能,对相应的配丝尺寸进行改动,采用预变形、后变形、股绳淋油、合绳过程张力控制、在线预张拉等工艺措施,使整绳破断拉力提高19%,60万次疲劳实验后伸长率小于0.31%,各项性能指标满足要求。     

电梯钢丝绳剑麻绳芯结构和生产控制

介绍剑麻的特点,以及电梯钢丝绳用剑麻绳芯结构、剑麻纱条质量要求和捻制质量控制要点。电梯钢丝绳用剑麻绳芯结构一般分3股和4股,常用直径为4.9～12 mm,捻距为绳芯公称直径的3～3.3倍,绳芯含油率为10%～15%,纱线应经过剪毛处理,并保证绳芯每股纱条根数在3根以上,且平均捻度与要求捻度相差应不超过±5%。绳芯用油脂要同钢丝绳用油脂相同,最好选用进口高品质油脂。选用捻股合绳一次成型的先进绳芯生产设备,并严格控制生产工艺,可有效提高绳芯质量。     

超高速电梯钢丝绳研制及使用状况

电梯钢丝绳要求使用寿命长和质量稳定。以9×25Fi+IWRC—13.0钢丝绳为例,介绍超高速电梯用钢丝绳的研制过程及检测和安装使用情况。外层钢丝强度确定为1 600~1 700 MPa,外股内层钢丝、中心钢丝和绳芯钢丝的强度为1 620~1 850 MPa,钢丝的扭转、弯曲次数比《电梯钢丝绳用钢丝》标准规定提高15%。钢丝绳捻制时控制钢丝及股张力的均匀性、绳股和绳芯的捻制应力状态等;选择300系列捻股机对股绳进行捻制,绳股含油率控制在1.5%~2.0%;采用8辊预变形器对绳芯股进行预变形,用18辊后变形器减小绳芯的捻制应力,将绳芯股的变形率控制在50%。经过检测,钢丝绳力学性能满足相关标准要求。     

电梯用钢丝绳预变形工艺设计

预变形参数对电梯用钢丝绳生产及使用性能的影响至关重要。在生产过程中,可调卧式预变形器由于压下量和轮间距可同时调节,适合生产电梯用钢丝绳。预变形器在设计过程中要综合考虑锥角、工作轮直径和轮槽半径等因素。预变形工艺参数的设计原则:保证股绳在经过预变形器时中间变形轮对股绳的变形量。钢丝绳股绳结构、捻制状态、规格强度、绳芯材质等都会对预变形效果产生影响。计算形幅率是客观判定预变形参数设定效果的检验方法,纤维芯形幅率控制在82%～90%,钢芯形幅率控制在82%～87%。     

35mm钢丝绳断绳事故分析

针对某油田 35mm钢丝绳使用过程中的断绳事故 ,借助整绳破断拉力试验 ,对事故原因进行分析 ,认为事故发生前钢丝绳外层钢丝严重磨损和断丝是导致断绳的根源 ,钢丝绳直径显著减小是发生断绳事故的直接原因。纤维芯钢丝绳的绳芯在工作过程中有被挤细的倾向性 ,使用时应密切关注钢丝绳直径的变化和磨损程度。解决钢丝绳直径减小的有效措施是使用钢芯钢丝绳。     

φ35 mm钢丝绳断绳事故分析

针对某油田φ35mm钢丝绳使用过程中的断绳事故，借助整绳破断拉力试验，对事故原因进行分析，认为事故发生前钢丝绳外层钢丝严重磨损和断丝是导致断绳的根源，钢丝绳直径显著减小是发生断绳事故的直接原因。纤维芯钢丝绳的绳芯在工作过程中有被挤细的倾向性，使用时应密切关注钢丝绳直径的变化和磨损程度。解决钢丝绳直径减小的有效措施是使用钢芯钢丝绳。     

专利选登

<正>专利名称:一种碳纤维芯填充的高速电梯用钢丝绳专利申请号:CN201410378275.9公开号:CN104153226A申请日:2014.08.01公开日:2014.11.19申请人:无锡通用钢绳有限公司本发明公开一种碳纤维芯填充的高速电梯用钢丝绳,包括碳纤维绳芯,所述碳纤维绳芯由4股碳纤维芯捻合而成,每股碳纤维芯均由若干根碳纤维单丝构成。所述碳纤维芯填充的高速电梯用钢丝绳采用4股碳纤维芯,并将其捻合成碳纤维绳,使其具有     

Application of failure mode and effect analysis model to foodservice systems operated by chefs in practice and by chefs from a culinary school in Turkey

Failure mode and effect analysis (FMEA) methodology has been applied for the risk assessment of basic foodservice systems operated by the “chefs in practice” and by the “chefs from a culinary school” in Turkey. Firstly, the preliminary hazard analysis was done to predict the potential failure modes in the food flow of basic foodservice systems. Each step in the process, from receiving of raw ingredient to table, was analyzed. The risk priority numbers (RPN) were calculated for each failure mode. The corrective actions were suggested to lower the RPN values below the acceptable limit of 120. The data collected in this study compared to the data from a study carried out with “chefs in practice” about basic food safety issues. The significant difference was observed between “the chefs in practice” and “the chefs with formal culinary education”. Majority of chefs from a culinary school have scored better in many food safety issues, so thus the corrective actions in the FMEA table. The results clearly point out the urgent need for FMEA integration and for food handler education in current foodservice establishments in Turkey.     

Application of failure mode and effect analysis (FMEA), cause and effect analysis and Pareto diagram in conjunction with HACCP to a potato chips manufacturing plant

Failure mode and effect analysis (FMEA) model has been applied for the risk assessment of potato chips manufacturing. A tentative approach of FMEA application to the snacks industry was attempted in order to analyse the critical control points (CCPs) in the processing of potato chips. Preliminary hazard analysis was used to analyse and predict the occurring failure modes in a food chain system (potato processing and potato chips processing plant), based on the functions, characteristics and/or interactions of the ingredients or the processes, upon which the system depends. CCPs have been identified and implemented in the cause and effect diagram (also known as Ishikawa, tree diagram and fishbone diagram). Finally, Pareto diagrams were employed towards the optimisation potential of FMEA.     

Application of failure mode and effect analysis model to foodservice systems operated by chefs in practice and by chefs from a culinary school in Turkey

Failure mode and effect analysis (FMEA) methodology has been applied for the risk assessment of basic foodservice systems operated by the “chefs in practice” and by the “chefs from a culinary school” in Turkey. Firstly, the preliminary hazard analysis was done to predict the potential failure modes in the food flow of basic foodservice systems. Each step in the process, from receiving of raw ingredient to table, was analyzed. The risk priority numbers (RPN) were calculated for each failure mode. The corrective actions were suggested to lower the RPN values below the acceptable limit of 120. The data collected in this study compared to the data from a study carried out with “chefs in practice” about basic food safety issues. The significant difference was observed between “the chefs in practice” and “the chefs with formal culinary education”. Majority of chefs from a culinary school have scored better in many food safety issues, so thus the corrective actions in the FMEA table. The results clearly point out the urgent need for FMEA integration and for food handler education in current foodservice establishments in Turkey.     

解读ISO17893抗旋转钢丝绳分类表

分析不旋转钢丝绳研发中存在的问题,介绍国外对不旋转钢丝绳的研究,结合特殊结构不旋转钢丝绳的研发现状与国外钢丝绳品牌,对ISO 17893抗旋转钢丝绳分类表进行研究,提出值得继续研究的2个问题及按照组绳总股数、股结构、最外层绳股数、内层股在绳中排列方式等因素对多层股抗旋转钢丝绳进行结构式描述的建议。     

海洋石油平台系泊索研究及应用

系泊索是海洋平台和浮式生产装置的重要组成部分,对不同类型系泊索的特点、用途、主要失效形式及技术发展现状进行分析。系泊链最高强度等级为R5级,主要失效形式为磨损、应力腐蚀、塑性破断、脆性破断、疲劳断裂;常用钢丝绳类系泊索有多股钢丝绳(如6股绳)和单捻钢丝绳,主要失效形式为腐蚀、磨损、冲蚀、疲劳;纤维缆绳系泊索质量轻、弹性好,但不耐磨。通过对国外系泊索失效数据的统计分析,指出防腐性能好、强度高、耐疲劳的产品仍将是系泊索的主要研究对象,对系泊系统的健康监测应受到重视。     

Application of failure mode and effect analysis and cause and effect analysis on processing of ready to eat vegetables – part II

Failure mode and effect analysis (FMEA) model has been applied for the risk assessment of ready to eat vegetables manufacturing. A tentative approach of FMEA application to the ready to eat vegetables industry was attempted in conjunction with cause and effect diagrams. critical control points have been identified and implemented in the cause and effect diagram (also known as Ishikawa, tree diagram and fishbone diagram). The main emphasis was put on the quantification of risk assessment by determining the risk priority number (RPN) per identified processing hazard. Receiving, storage and distribution, packaging and cooling were the processes identified as the ones with the highest RPN (225, 225, 180 and 144 respectively) and corrective actions were undertaken. Following the application of corrective actions, a second calculation of RPN values was carried out leading to considerably lower values (below the upper acceptable limit of 130). It is noteworthy that the application of Ishikawa (cause and effect or tree diagram) led to converging results thus corroborating the validity of conclusions derived from risk assessment and FMEA. Therefore, the incorporation of FMEA and cause and effect analysis within the ISO22000 system of a ready to eat vegetables processing industry is considered imperative.     

Application of Failure Mode and Effect Analysis (FMEA), cause and effect analysis, and Pareto diagram in conjunction with HACCP to a corn curl manufacturing plant

The Failure Mode and Effect Analysis (FMEA) model has been applied for the risk assessment of corn curl manufacturing. A tentative approach of FMEA application to the snacks industry was attempted in an effort to exclude the presence of GMOs in the final product. This is of crucial importance both from the ethics and the legislation (Regulations EC 1829/2003; EC 1830/2003; Directive EC 18/2001) point of view. The Preliminary Hazard Analysis and the Fault Tree Analysis were used to analyze and predict the occurring failure modes in a food chain system (corn curls processing plant), based on the functions, characteristics, and/or interactions of the ingredients or the processes, upon which the system depends. Critical Control points have been identified and implemented in the cause and effect diagram (also known as Ishikawa, tree diagram, and the fishbone diagram). Finally, Pareto diagrams were employed towards the optimization of GMOs detection potential of FMEA.     

对压实单层股抗旋转钢丝绳相关问题的再认识

简述压实单层股抗旋转钢丝绳演变过程;介绍其结构品种,给出单层钢丝股、纤维芯多工序交叉捻股、纤维芯复合捻股、纤维芯平行捻股、纤维芯组合平行捻股、全钢丝平行捻股、全钢丝组合平行捻股、压实组合平行捻股等压实单层股抗旋转钢丝绳的结构示意图;叙述其在国内生产、使用情况及与国外在结构品种上的差距;研究其用于频繁冲击载荷时股间断丝、表面断丝、次外层断丝以及断股、断绳几率相对较高的主要原因;提出产品质量改进与应用推广建议。     

我国粗直径钢丝绳的生产研发现状及建议

我国粗直径钢丝绳的应用领域越来越广 ,市场发展潜力较大 ,但目前高性能的粗直径钢丝绳主要靠进口。分析了国内粗直径钢丝绳的生产研发现状 ,指出该类产品在生产、研发方面与工业发达国家的差距 ,提出了应在标准修订、结构设计、绳用钢丝生产工艺、捻绳时的恒张力控制等方面加以改进的建议     

三角股钢丝绳的应用领域

通过实例介绍三角股钢丝绳在采油、高炉卷扬、缆索起重机、桥式起重机等领域的应用,给出不同应用时的结构和规格,从发展的观点预测三角股钢丝绳在电铲上的应用。分析说明国产三角股钢丝绳开发的新动态。