Conducted review of methods of calculation of productivity of open-pit excavators and results of verification calculations shows that, there is no uniform method that counts constantly changing physical and mechanical properties of developed rocks, technological parameters of a face, design and force parameters of an excavator, probability of its no-failure operation, casual character of transport delivery, qualification of the excavator operator, climatic conditions. Calculation of productivity of open-pit excavators under specific mining and geological conditions is made for planning and rationing of excavation and loading machines, the choice and provision of transport and establishment of a rational mode of their operation. In the given conditions of open-cut mining, an excavator, productivity depends on many natural, mining-technological, and organizational factors, which are difficult to take into account and largely interact with the design parameters of open-pit excavators. In fact, most of the factors are probabilistic in nature. As a consequence, it is advisable to define new values of productivity for each individual case based on the cumulative account of changes of multifactorial conditions of operation and technical conditions of technologically connected equipment. In this regard, it is of interest to determine the value of productivity of quarry excavators with an account of the stated factors.
Карьер экскаваторлари унумдорлигини ҳисоблаш методикаси бўйича амалга оширилган таҳлиллар ва текширув натижалари шуни кўрсатдики, экскаватор унумдорлигини аниқлаш бўйича тоғ жинсларининг физик ва механик хусусиятлари, ковжойнинг технологик ўлчамлари, экскаваторнинг конструктив ва куч ўлчамлари, узлуксиз ишлаш эҳтимоллиги, транспорт воситасининг тасодифий узатилиши, экскаватор машинистининг малакаси, климатик шароитларни инобатга олувчи ягона методика мавжуд эмас. Аниқ кон-геологик шароитлар учун экскаваторлар унумдорлигини ҳисоблаш қазиш-юклаш ишларини режалаштириш ва нормаллаштириш, транспорт воситасини танлаш ва таъминлаш ҳамда улар функционаллигининг рационал режимларини аниқлаш учун амалга оширилади. Мавжуд очиқ кон шароитлари учун экскаваторнинг унумдорлиги карьер экскаваторларининг конструктив ўлчамларига маълум миқдорда таъсир этувчи ва қийин ўлчанадиган табиий, кон-технологик, ташкилий омилларга боғлиқ. Аслида, омилларнинг аксарияти эҳтимоллик хусусиятига эга. Бунинг оқибатида ҳар бир реал ҳолат учун кўп омилли иш шароитлари ва технологик боғлиқ бўлган жиҳозларнинг техник ҳолатидаги ўзгаришларни ҳисобга олган ҳолда, унумдорлик қийматларини аниқлаш мақсадга мувофиқдир. Шу боис тоғ-кон экскаваторлари иш унумдорлиги қийматини юқоридаги омилларни ҳисобга олган ҳолда аниқлаш долзарб масаладир.
Проведенный анализ методик расчета производительности карьерных экскаваторов и результатов выполненных проверочных расчетов показывает следующее, что нет единой методики, учитывающей: постоянно меняющиеся физико-механические свойства разрабатываемых пород, технологические параметры забоя, конструктивно-силовые параметры экскаватора, вероятность безотказной его работы, случайный характер подачи транспорта, квалификацию машиниста экскаватора, климатические условия. Расчет производительности карьерных экскаваторов при конкретных горно-геологических условиях работы ведется для планирования и нормирования выемочнопогрузочных машин, выбора и обеспечения транспортом и установления рационального режима их функционирования. В заданных условиях разработок открытым способом производительность экскаватора зависит от множества природных, горно-технологических, организационных факторов, сложно поддающихся учету и в значительной степени взаимодействующих с конструктивными параметрами карьерных экскаваторов. По существу, большинство факторов носят вероятностный характер. Вследствие этого для каждого реального случая на основе совокупного учета изменений многофакторных условий эксплуатации и технического состояния технологически увязанного оборудования целесообразно определять значения по производительности. В связи с этим представляет интерес вопрос определения значения производительности карьерных экскаваторов с учетом изложенных факторов.
Conducted review of methods of calculation of productivity of open-pit excavators and results of verification calculations shows that, there is no uniform method that counts constantly changing physical and mechanical properties of developed rocks, technological parameters of a face, design and force parameters of an excavator, probability of its no-failure operation, casual character of transport delivery, qualification of the excavator operator, climatic conditions. Calculation of productivity of open-pit excavators under specific mining and geological conditions is made for planning and rationing of excavation and loading machines, the choice and provision of transport and establishment of a rational mode of their operation. In the given conditions of open-cut mining, an excavator, productivity depends on many natural, mining-technological, and organizational factors, which are difficult to take into account and largely interact with the design parameters of open-pit excavators. In fact, most of the factors are probabilistic in nature. As a consequence, it is advisable to define new values of productivity for each individual case based on the cumulative account of changes of multifactorial conditions of operation and technical conditions of technologically connected equipment. In this regard, it is of interest to determine the value of productivity of quarry excavators with an account of the stated factors.
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