采煤机 毕业论文外文翻译.doc

英文原文utilisation of data mining in mining industry:improvement of the shearer loader productivity in underground minesi. introductionthe longwall system is the heart of the coal mining process. it is considered to have a simple layout but requires stringent adherence to some basic features in the development of the panel to make it work. similarly, in order to produce the required business production volume, all critical equipments must operate to their required level of service according to the systems established operating mission profile. the integrated nature of production system demands that all units or sub-systems should function with acceptable level of reliability to achieve planned production. the highly productive underground longwall mining equipment is very expensive and it requires proper assessment of serviceability of each component for maintenance management. shearer is used for getting coal in a longwall face and its breakdown is catastrophic in financial terms. therefore, its availability is a must for the economic sustainability of the project. if the shearer is not working efficiently, this may reduce the efficiency of the entire production system 1. in the case of the highly mechanised shearer loader, an annual coal production target of four million tons was established to achieve the annual revenue target. to achieve this level of productivity, the shearer is expected to operate at 40 weeks-operating year at 106 hours per week and allowing for only two longwall moves in a year. this tight target seems to be unrealistic considering the currentincreasing failure rate of the overall system. this unreliable condition only holds true in the absence of correct and auditable strategic maintenance and reliability policy, management systems and procedures in place. in this industrial case a substantial amount of time is being put together to systematically extract the appropriate data and analyse a few factors. the factors include the cause of failure, current maintenance regime, maintenance system and procedures, quality of computerised equipment historical records, data management and analysis and human reliability. this is in order to identify gap and implement effective solutions to the shearers current reliabilityshortcomings.the goal of this study is to develop a procedure to optimize maintenance plan for the shearer loader that would minimize costly production losses and improve reliability. the program is to consider long-term plant operation (with possible equipment life extension) by continuing with processes that have provided excellent past performance, proceeding with existing maintenance improvement programs, and recommend new cost effective maintenance task.this study aimed at achieving the following objectives to drive delivery of the end goal:1) to identify a cost-effective maintenance strategy by reviewing, rationalising and optimising existing maintenance task.2) apply design methodology in order to increase the level of service from its current performance; improve life cycle cost and reliability of the shearer over its design mission life.3) to develop guidelines for operation and maintenance integration4) identify effective means of recording and utilising meaningful reliability data for performance analysis.5) ensure plant equipment is maintained appropriately byconsidering its importance to safety, reliability, and availability.the study also highlighted the significance of risk based assessment methodology such as fmea/fmeca, planned maintenance optimisation (pmo). the practice and principles of reliability and maintainability modelling has proven to generate increased profitability among world leader in mining industry. this method was found useful as an effective planning and operational tool for automatic and highly complex mine production system while employing almost without redundancy high cost critical equipment i.e.,the shearer loader. this is where return on investment (roi) can be justified by longer mtbf before scheduled maintenance task could interfere 2-3. the period of this study, where data were mined and analysed, was february august 2010. interestingly, a positive improvement in performance of the shearer has been observed since the early implementation of the analysis findings.ii. the function of the shearer loaderthe shearer loader installed in the underground mining is a double ended ranging drum shearer (derds) equipped with outboard ranging arms. it is designed and manufactured to extract and load coal into the armoured face conveyor which is also a critical integral part of the longwall mining system. the shearer operates within a minimum seam range of 1.8 metres and a maximum of 3.0 metres with an undercut of not less than 150mm with a 1000mm web. the shearer is also capable of both half web and bi-directional cutting and loading the full seam section at rated capacity to achieve the production requirements up to 4.0 million tonnes from thelongwall, in a 40 week operating year, with a weekly average of 100,000 tonnes. this operating schedule allows for two longwall moves per year. the shearer loader is expected to achieve the equipment availability of not less than 98% of any given month, when operated 5-days a week (106 hours per week). figure 1 shows the major components of the shearer loader.iii. reliability issues and risk assessment methodologythe shearer failed to meet the availability performance target within the period due to several preventable failure modes that causes business interruptions. a swot analysis that was conducted from the start of this study shows the following factors directly impacting the shearer performance;1. planning and scheduling done in ad-hoc basis2. equipment hierarchy limited to high level and does not capture failure modes to its component and sub-system component3. compliance to maintenance schedule is inconsistent4. poor data utilisation5. backlog not measured6. work order package incomplete (swms, jsa, drawings, bom,etc.)a reliability analysis and comprehensive failure mode effect and criticality (fmeca) were carried out to identify failure rates of individual critical maintainable items and failure modes. the outcome of this process concluded with chronic reappearance of the same failed maintainable items caused by the same failure modes and failure mechanism that is causing the loss of its function. a pareto analysis was used to identify a list of problems, using criteria of highest total revenue loss, breakdown frequency, mean time between failures (mtbf) and mean time to repair (mttr) 4. pareto analysis identifies trailing cable failure as a leading contributory to cause business interruption. the sub-causes of this failure include the physical damage which occur majority of time and minor recurrence cause by electrical protection device malfunctioning and electrical faults. root causes physical damage to trailing cables was further identified using the apollo root cause analysis. apollo root cause analysis is a problem solving technique that operates in principle that “things dont just happen, they are made to happen.” cause and effectrelationships govern everything that happens and as such are the path to effective problem solving 5. this cause and effect relationship identifies failure modes highlighted in in the fmeca process. furthermore, additional business interruption is also driven by other cause factors with the most number of downtime as follows:1.electrical system failure2.control and monitoring system failure3.mechanical haulage failureiv. field data collection & feedbackdata collection from the field and on-line monitoring system must be accurate and realistic. it provides a starting point of generating formal failure-reporting document and ensures that the feedback is both consistent and adequate 6. pulse is a computerised maintenance management system (cmms) used currently in the underground mine. it is a central database and a depository of all pertinent data relating to the plant register.the system is capable of providing the following information:1.work order type and priority2.selecting maintenance type3.raising requisition from work order4.equipment information and bill of materials (bom)5.equipment history6.suppliers information and cost reporting7.estimates (time and labour information)8.real time capture of the operating time of the asset in a 24-hours/daythe system also provides links to other critical information to effectively carry out the required work such as:1.job plans/ standard works2.safe work procedures3.work permits4.risk assessment5.drawings and other technical referencesthe software organises the equipment hierarchy starting from the plant register level and extending:1.two levels downwards, to sub-assembly and component;2.two levels upwards, to plant group and site code.outside the plant hierarchy, pulse uses a user defined key field,location, which is intended to indicate the equipments physical location within the sites boundaries.v. conclusionthe global trend in longwall coal mining production system is towards ever increasing productivity with the least operating and maintaining cost possible. this trend is reflected nowhere better than in the increasing production expectations from the existing longwall installation and the next generation of longwall installation. subsequently, the demand for the shearer loader to increase longwall production is accompanied by the increased in the level of service and high level of automation to ensure a safe and efficient working environment for the operators combined with consistent coal face equipment management regime. however, profitability depends on having the means to accurately diagnose any performance issues before they lead to production downtime. therefore, it is vital to have the right mix of satisfied and reliable working personnel using correct fault detection tools, optimised maintenance task-oriented and becoming knowledgeable and actively involved on fmeca and root cause analysis to deliver value to the business. the study proved that it is the right way to improve reliability of the shearer. qualitatively, the maintenance resource utilisation becomes efficient in controlling and safely managing failure modes of the shearer. it is where items such as technology and control mechanism are applied to enable the processes to reach the maximum potential. also, this study shows that the computerised acquisition of an accurate and reliable data and application of reliability tool such as fmeca, weibull analysis and problem solving technique are essential in understanding and managing failure behaviour and performance of the shearer loader over its operating life span. excellence is not a static standard. the bar is always being raised; so sustained peak performance of the shearer requires continuous improvement based on its history data. effective utilisation of data analysis and industrial informatics can help us achieve this objective. 中文译文i.介绍长壁煤炭开采过程中系统的心脏。它被认为是有一个简单的布局，但需要严格遵守的面板，使其工作在发展的一些基本特征。同样，以产生所需的业务产量，所有关键设备必须工作到他们所需的服务级别，根据系统的建立工作任务剖面。生产系统的综合性质，要求所有单位或子系统应该能够在可接受的水平，可靠性，实现计划生产。高生产力的井下长壁开采设备是非常昂贵的，它需要适当的评估每个组件的维护管理可维护性。希勒用于在工作面的煤炭，其故障是灾难性的财务条款。因此，它的可用性是一个必须为经济的可持续发展项目。如果采煤机不能有效地工作，这可能会降低效率的整个生产体系1。煤炭年产量400万吨的目标在高度机械化采煤机的情况下，建立了实现全年收入目标。要做到这一点的生产力水平，采煤机预计在106小时，每星期工作在40周营运年度，并允许在一年内只有两个工作面移动。这种紧密的目标似乎是不现实的，考虑到目前的增加了整个系统的故障率。这种靠不住的情况缺乏正确和可审计的战略维护和可靠性的政策，管理制度和程序，只有拥有真正的。在这个工业的情况下，大量时间被放在一起，系统中提取相应的数据，并分析了几个因素。这些因素包括失败的原因，目前的保养维修制度，维护制度和程序，电脑设备的历史记录的质量，数据管理和分析，可靠性和人力。这是为了找出差距和有效的解决方案，以实现采煤机的可靠性缺点。这项研究的目标是开发一个程序来优化维修计划，采煤机，将最大限度地减少昂贵的生产损失，提高供电可靠性。该计划是要考虑长期的工厂操作（有可能会导致设备寿命延长），通过持续的过程，提供了优异的过往表现，继续与现有的维修改进方案，并建议新的成本有效的维护任务。本研究旨在实现以下目标驱动交付的最终目标：1）要找出一个符合成本效益的维护策略，通过审查，合理化和优化现有的维护任务。2）应用设计的方法，以提高服务水平，从目前的表现，希勒在其设计任务寿命，提高生命周期成本和可靠性。3）制定政策，操作和维护一体化4）确定进行性能分析的有意义的可靠性数据的记录和利用的有效手段。5）确保工厂设备保持适当byconsidering其安全性，可靠性和可用性的重要性。该研究还强调风险评估为基础的方法，如fmea / fmeca的意义，计划维护优化（pmo）。的做法和原则已被证明的可靠性和可维护性建模生成在世界领先的采矿业的 盈利能力增加。此方法可作为一个有效的规划和操作的工具，自动化和高度复杂的矿井生产系统，而采用几乎没有冗余成本高，关键设备，即采煤机。这是可以合理的投资回报率（roi）更长的平均无故障时间，之前预定的维护任务可能会干扰2-3。这项研究期间，如果数据被开采和分析，是2月 - 2010年8月。有趣的是，积极改善采煤机的性能已被观察到初以来实施的分析结果。二。采煤机的功能安装在地下开采的采煤机是一个双端测距滚筒采煤机（derds）配备舷外摇臂。它的设计和制造，提取和加载到刮板输送机，这也是一个重要的组成部分的长壁开采系统煤炭。希勒缝范围内最低为1.8米和3.0米，底切不小于150mm，1000mm的网页最多。希勒还能够两个半web和双向切割和装载全煤部分在额定容量，实现了生产的要求从4.0万吨长壁，在40周的经营年度，平均每周为100,000吨。此作业时间表允许每年的两个长壁移动。有望实现采煤机运行时，设备利用率不低于98的任何一个月，每周5天（106小时，每星期）。图1示出的采煤机的主要组成部分。iii。可靠性问题和风险评估方法采煤机未能满足可用性性能目标的期间内，由于一些可预防的故障模式，会导致业务中断。本研究从一开始就进行的swot分析显示下列因素直接影响采煤机性能;1。在特设的基础规划和调度2。仅限于较高水平，设备层次不捕获它的组件和子系统组件的故障模式3。符合维护时间表不一致4。数据利用差5。积压未测6。工单包不完整（swms，js