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Date submitted2019-05-05
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Date accepted2019-07-03
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Date published2019-10-23
Scraper Face Conveyors Dynamic Load Control
- Authors:
- E. K. Eshchin
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 ofSC.
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Date submitted2019-01-20
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Date accepted2019-03-04
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Date published2019-06-25
Improving transportation efficiency belt conveyor with intermediate drive
- Authors:
- I. S. Trufanova
- S. L. Serzhan
Modern industry in the XXI century requires high-performance and fully automated technology. The best way to meet these requirements is the introduction of new progressive technologies in the process of transportation. One of the possible ways to increase productivity, as well as automate the process of transportation, is the transition from cyclic machines to continuous transport, namely to belt conveyors. However, with the increase in the length of the conveyor there is a need for stronger belts. This can be avoided by using intermediate drives of various designs. The article describes the principle of operation of the intermediate linear drive with transverse partitions, provides formulas for calculating the values of the tractive effort, gives comparative graphs showing the effectiveness of the use of an intermediate drive in various conditions. The possibilities of increasing the capacity of an intermediate linear drive are described.
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Date submitted2009-08-21
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Date accepted2009-10-23
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Date published2010-02-01
New constructions of belt-ropes conveyors for the mountain enterprises
- Authors:
- Yu. D. Tarasov
- A. V. Kopteva
The new design of cable-belt conveyor is described. This type of conveyor is alternative of existing two-planimetric cable-rope conveyors and it allows to eliminate organic lacks of existing conveyors is described. Settlement formulas for definition of key parameters defining loadings on elements of the conveyor and its drive are resulted.
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Date submitted1953-07-08
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Date accepted1953-09-30
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Date published1954-12-04
Единый метод расчета тяговых органов канатных откаток и ленточных конвейеров
- Authors:
- Unknown
Существующий метод расчета тягового органа рудничных канатных откаток аналогичен методу расчета каната шахтных подъемных установок, разработанному А. П. Германом. Метод заключается в определении веса погонного метра каната по максимальной статической нагрузке на канат, включающей также его собственный вес, и в выборе каната по заводским данным на основе найденного веса. Применяемый в настоящее время метод расчета тягового органа ленточных конвейеров состоит в предварительном определении мощности на валу приводного барабана конвейера, для чего ориентировочно принимается вес движущихся частей конвейера, затем последовательно определяются: тяговое усилие, максимальное натяжение ленты, потребное число прокладок и, наконец, вес погонного метра ленты. После того, как ориентировочно определен вес ленты, производится повторный окончательный расчет. При существующей методике расчета вес движущихся частей конвейера должен неизбежно приниматься ориентировочно, так как точный вес ленты в начале расчета неизвестен.
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Date submitted1953-07-16
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Date accepted1953-09-22
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Date published1954-12-04
Максимальная длина скребкового конвейера на один привод
- Authors:
- Unknown
В практике производственных и проектных работ часто возникает необходимость определения максимальной длины скребкового конвейера на один привод для конкретных условий транспортирования. Однако до настоящего времени этот вопрос в технической литературе освещен недостаточно полно. В данной статье ставится задача установления расчетных формул для определения длины конвейера на один привод в зависимости от основных параметров транспортной установки — прочности тягового органа и установленной мощности двигателя