Material flow in active mining faces

活跃采矿工作面的物料流

• 批准号: RGPIN-2016-06514
• 负责人: Joseph, Timothy
• 金额: $ 1.97万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=708062
• 关键词: Material; flow; active; mining; faces

Summary, justification and objectives This proposal will establish novel mining excavator operational performance analyses, measurement and test systems and excavator bucket design guidelines, supporting a low energy, low cost, higher productivity goal. This research will support mining industry operations in achieving lower operating and maintenance costs, and excavator manufacturers in alternative design considerations. Rope shovel and hydraulic excavator bucket designs and operational use have remained essentially the same for over 100 years and 50 years respectively. The proportion of a bucket volume that efficiently fills during excavation, termed fill factor'; productive dig energy impacting the ease that blasted rock or soil can be excavated; high ground engaging tool (bucket teeth) abrasive wear; and overall impacts on excavator mechanical availability remain unanswered mining industry concerns. These all result in operational and maintenance lost time and expense. Issues of excavator pad stability; and mobile mining equipment excess fuel use are additional concerns. It is proposed that three principal full time HQP and up to a dozen additional short term HQP (BSc co-op) will receive training through field measurements, scaled laboratory tests and numerical modeling; to principally evaluate the fundamental flow mechanisms of fragmented rock and soils interacting with excavator buckets of different configuration (a function of mode of use and excavator type). To better understand parallel issues of abrasive wear and productivity as a function of specific energy (the energy expended per unit volume excavated), alternative bucket operational modes, wear protection materials selection, and novel bucket geometries as a function of the dig conditions will be suggested. Approach, novel measurement techniques and analysis A novel (1) laboratory scale bucket-dig face interaction see through tank' test system, equipped with high speed and strain camera measurement systems, complimenting more conventional reaction force measurement; and (2) modified field mimicking' (force loading and dig rate) programmable abrasion wear test system, will be principally used. It is planned that up to ten bucket designs, plus several hundred wear samples will be tested during this work. Analyses will evaluate dig path, dig and wear energies, fill factors, slope stability and failure/flow mechanisms; as a function of bucket shape and operational motions. Analyses will also be correlated to field excavator fuel use (reflective of emissions) and ground stability beneath excavator tracks, leading to a novel performance analysis of excavator undercarriage evaluating the likelihood of damage requiring high maintenance. Additional more conventional geotechnical strength, material density and ground particle size characterization tests will also be used to establish dig conditions.

摘要、理由和目标 该提案将建立新型采矿挖掘机操作性能分析、测量和测试系统以及挖掘机铲斗设计指南，支持低能耗、低成本、更高生产率的目标。 这项研究将支持采矿业运营降低运营和维护成本，并支持挖掘机制造商考虑替代设计。 绳索铲和液压挖掘机铲斗的设计和操作用途分别在 100 多年和 50 多年中基本保持不变。 挖掘过程中有效填充的铲斗容积的比例，称为“填充系数”；有效的挖掘能量影响着爆破岩石或土壤的挖掘难易程度；高地接合工具（斗齿）磨粒磨损；对挖掘机机械可用性的总体影响仍未解决采矿业的担忧。 这些都会导致运营和维护损失时间和费用。 挖掘机垫板稳定性问题；移动采矿设备过度使用燃料也是另一个问题。 建议三名主要全职 HQP 和多达十几个额外的短期 HQP（BSc co-op）将通过现场测量、规模化实验室测试和数值建模接受培训；主要评估碎石和土壤与不同配置的挖掘机铲斗相互作用的基本流动机制（使用模式和挖掘机类型的函数）。 为了更好地理解磨料磨损和生产率作为比能量（每单位挖掘体积消耗的能量）函数的并行问题，将建议替代铲斗操作模式、磨损防护材料选择和新颖的铲斗几何形状作为挖掘条件的函数。 方法、新颖的测量技术和分析 新颖的 (1) 实验室规模的铲斗-挖掘面交互透视坦克测试系统，配备高速和应变相机测量系统，补充了更传统的反作用力测量； (2) 将主要使用改进的现场模拟（力加载和挖掘速率）可编程磨损测试系统。 计划在此工作期间测试多达十个铲斗设计以及数百个磨损样本。 分析将评估挖掘路径、挖掘和磨损能量、填充系数、边坡稳定性和破坏/流动机制；作为铲斗形状和操作运动的函数。分析还将与现场挖掘机燃料使用（反映排放）和挖掘机履带下方的地面稳定性相关联，从而对挖掘机底盘系统进行新颖的性能分析，评估需要高度维护的损坏的可能性。其他更传统的岩土强度、材料密度和研磨粒度表征测试也将用于建立挖掘条件。