Journal of Mining Institute最新文献_第10页

Scraper Face Conveyors Dynamic Load Control 刮板面输送机动态载荷控制

IF 2

Journal of Mining Institute Pub Date : 2019-10-25 DOI: 10.31897/pmi.2019.5.570

Евгений Константинович Ещин

{"title":"Scraper Face Conveyors Dynamic Load Control","authors":"Евгений Константинович Ещин","doi":"10.31897/pmi.2019.5.570","DOIUrl":"https://doi.org/10.31897/pmi.2019.5.570","url":null,"abstract":"The task of controlling the dynamic loading of scraper face conveyors (SC) is considered and the unsatisfactory state of loading of mechanical and electrical components of the SC is recorded. The possibility of the appearance of a self-oscillatory nature of the entire system load due to the peculiarities of the movement of the traction chain along the lattice frame of the SC is indicated. The property of the system is noted – the cyclic nature of the loading of the circuit during movement, which causes energy exchange processes between the mechanical and electromotive components of the conveyor (when using the head and tail electric drives) through the common cable network of the power supply system of the SC. A high level of dynamic loading of the electromechanical system causes the problem of eliminating the self-oscillating operating mode of the SC that generates it which is proposed to be solved by changing the angular rotation speeds of the SC drive sprockets. Angular speeds can be changed by applying frequency control of asynchronous electric motors. The efficiency of setting the frequency of electric motor stator currents of the head and tail drives of the conveyor is established in proportion to the frequency of rotors rotation to eliminate self- oscillating modes of operation in the main operating mode. The possibility of reducing the starting shock values of the electromagnetic moments of electric motors is considered. The results of the calculation of the start-up and liquidation of the self-oscillating operating mode are presented on the example of the scraper face conveyor Anzhera-34. The results of calculations of the start-up modes and the main operational transportation of coal in an uncontrolled mode of operation and after the introduction of control are compared, based on which it is concluded that it is advisable to use active control of the dynamic loading of SC.","PeriodicalId":16398,"journal":{"name":"Journal of Mining Institute","volume":"1 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86848753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Estimation of Rock Mass Strength in Open-Pit Mining 露天开采岩体强度的估算

IF 2

Journal of Mining Institute Pub Date : 2019-10-25 DOI: 10.31897/pmi.2019.5.502

A. Pavlovich, V. Korshunov, A. Bazhukov, N. Melnikov

引用次数: 5

Salt Rock Deformation under Bulk Multiple-Stage Loading 大块多段加载作用下的盐岩变形

IF 2

Journal of Mining Institute Pub Date : 2019-10-25 DOI: 10.31897/pmi.2019.5.510

I. Pankov, I. Morozov

引用次数: 1

Development of Manufacturing Technology for High-Strength Hull Steel Reducing Production Cycle and Providing High-Quality Sheets 高强度船体钢制造技术的发展，缩短生产周期，提供高质量钢板

IF 2

Journal of Mining Institute Pub Date : 2019-10-25 DOI: 10.31897/pmi.2019.5.536

V. G. Milyuts, V. Tsukanov, E. Pryakhin, L. B. Nikitina

引用次数: 7

Ensuring Stability of Undermining Inclined Drainage Holes During Intensive Development of Multiple Gas-Bearing Coal Layers 多层含气煤层集约开采中破坏倾斜排水孔的稳定性保障

IF 2

Journal of Mining Institute Pub Date : 2019-10-25 DOI: 10.31897/pmi.2019.5.497

V. Brigida, V. Golik, Y. Dmitrak, O. Gabaraev

{"title":"Ensuring Stability of Undermining Inclined Drainage Holes During Intensive Development of Multiple Gas-Bearing Coal Layers","authors":"V. Brigida, V. Golik, Y. Dmitrak, O. Gabaraev","doi":"10.31897/pmi.2019.5.497","DOIUrl":"https://doi.org/10.31897/pmi.2019.5.497","url":null,"abstract":"At high rates of production face advance, requirements towards reliable operation of undermining drainage holes get raised. The issue of maintaining high intensity of gaseous seams development under naturally increasing gas content, mining depth and capacity of production equipment poses a problem. The greatest threat comes from the loss of hole stability in the bearing pressure affected zone (in front of the face) and in the intensive shift area of overhanging rock corbels (behind the face). Intensification of air leaks due to deformation of borehole channel leads to impoverishment of removed methane-air mixture and an increasing risk to disturb safe aerogas regime in the mining area. The paper describes a mechanism of how coal-face operations affect the state of underground holes and formation of overhanging rock corbels. A typification of basic kinds of borehole deformations is presented. Authors point out critical disadvantages of the most widely-used technological schemes of gaseous seams development under high load on the production face, which hinder normal operation of a gas drainage system. As a result of research, a dependency of shot hole number, as well as the distance between shot hole axes and the borehole, on the stress state of the borehole outline has been defined more precisely. Basing on that, a formula to calculate drilling parameters of the discharge hole system has been suggested. Implementation of these measures will allow to increase the efficiency of underground gas drainage and to maintain growing intensity of gaseous coal seam development.","PeriodicalId":16398,"journal":{"name":"Journal of Mining Institute","volume":"32 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2019-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80862667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

http://pmi.spmi.ru/index.php/pmi/article/view/8354 http://pmi.spmi.ru/index.php/pmi/article/view/8354

IF 2

Journal of Mining Institute Pub Date : 2019-10-25 DOI: 10.31897/pmi.2019.5.576

A. Kozyaruk, A. M. Kamyshyan

引用次数: 4

A Modern View of Anomalies in the Metal Groups of the Periodic System of D.I.Mendeleev 门捷列夫周期系统金属群异常的现代观点

IF 2

Journal of Mining Institute Pub Date : 2019-10-25 DOI: 10.31897/pmi.2019.5.520

V. Bazhin, T. A. Aleksandrova, E. Kotova, A. Suslov

引用次数: 9

Determination of Optimal Fluorine Leaching Parameters from the Coal Part of the Waste Lining of Dismantled Electrolytic Cells for Aluminum Production 电解铝拆解废炉衬煤部分最佳氟浸出参数的确定

IF 2

Journal of Mining Institute Pub Date : 2019-10-25 DOI: 10.31897/pmi.2019.5.544

N. Nemchinova, A. Tyutrin, V. Somov

引用次数: 7

Effective Power and Speed of Mining Dump Trucks in Fuel Economy Mode 省油模式下矿用自卸车的有效功率和速度

IF 2

Journal of Mining Institute Pub Date : 2019-10-25 DOI: 10.31897/pmi.2019.5.556

V. Alexandrov, M. Vasileva, V. Koptev

引用次数: 4

Operation of a Single-phase Autonomous Inverter as a Part of a Low-power Wind Complex 单相自主逆变器作为小功率风电综合体的一部分的运行

IF 2

Journal of Mining Institute Pub Date : 2019-10-25 DOI: 10.31897/pmi.2019.5.564

А. А. Бельский, В. С. Добуш, Ш. Ф. Хайкал

引用次数: 20