Abstract
An important place in solving the tasks, standing before mining industry in Ukraine is the problem of further perfection of mine lifting complex, being of the most urgent in delivery of mineral resources from earth bowels.
In world practice to deliver mineral resources, obtained by an underground method, the liftings machines of drum type and machines with the pulleys of friction are used. In mines with a depth, to 700m the machines of the same thingdrums and two-drums are used. For mines with a depth more 700 m machines with the pulleys of friction with one lifting rope and multiropes, are used where a vessel is suspended on a few ropes.
Drum lifting machines are characterized by simplicity of construction and reliability in exploitation, but limited as for the height of lifting and low-productive. The difference of static pulls of ropes does not exceed 150-250kN skips at a maximal carrying capacity – not more 15t .
Another lack of existent friction machines is their limited hauling ability, mainly determined by the size of a circumference corner by the ropes of pulley of friction. In modern multirope systems due to setting of declining pulleys it is possible to attain the size of this corner, equal,195 degrees but not more. Limited hauling ability, in its turn, brings difficulties in adjusting the brake system of machine which must provide the timely stop of machine from one side, and from the other – not to cause slipping of ropes, that was the reason of failures.
For small depths (250-500m) friction systems in general are unacceptable for lifting cargo, providing the expedient productivity of setting technically, because of comparatively large size of deceleration, free outrunning of machines at insufficient massiveness of locomotive elements, that is one of indexes of criterion of unsliding ropes in preventive braking modes.
In practice of corporations of South Africa, mining minerals of depth to 3000m, the unstable two-rope systems of mine lifting were widely used with drum machines having multi-layer rope wind (so-called systems Bleyer). However in domestic mining industry such systems are not used mainly because of difficulty of providing well-organized multi-layer wind of ropes on the drums of existent constructions.
The tendency of reconstruction of operating mines was lately set with increasing mineral resource mining. A necessity in productivity increase of drum type lifting options.
One of the most effective ways of solving problem of multiplying the carrying capacity of liftings machines for shallow mines is development of new method of rope wind on the lifting machine drum – with the “running” coils of friction. The lifting sett with the “running” friction coils is an ordinary lifting machine the drum of which has one or several coils of rope friction, to both ends of which the proper lifting vessel is connected. Such machines can be one-rope, two-ropeor, multirope, depending on a rope capacity drum, height of lifting and carrying capacity of skips.
Such cargo handling systems possess positive qualities of options of the same thingdrums and friction sets that is reliability in exploitation and high performance. Their most important advantase is ability of service of comparatively shallow mines up (to 800m) with possibility to achieve suitable carrying capacity of skips (to 50t). The charts of liftings options with the “hurrying” coils of friction can also be used successfully for the reconstructed mines, in particular at deepening of barrels.
From 1206 liftings options of drums in coal industry of Ukraine, 165 machines – are two-rope of the with a cut drum installations, which at low capital costs can be reequipped for the systems with the “hurrying” coils of friction.
Thus, the problem of creation high-performance liftings options for shallow mines is connected with the development of new methods of wind of ropes, charts of lifting mine, pulleys of pile-drivers, suspended devices, the necessity of development mathematical model of dynamics of the lifting setting, equipped with the machine with the “hurrying” coils of friction to ground scientific ally basic parameters of setting that is the amount of ropes and coils of friction depending on the carrying capacity of skips and lifting height. Such problem is set the first, as well as the new method of delivery cargo by machines with the “hurrying” coils of friction.
Information is taken from:
Чермалых В.М., Ильин Е.А. Динамика многоканатных подъемных установок в период предохранительного торможения // Горный журнал. – М., 1963. – № 3. – С. 8-11.
Дворников В.И., Соломенцев К.А., Винникова А.Э. Эффективность использования машин с «бегущими» витками трения // Уголь Украины. - 2004. - №4. - С. 34-36.
Дворников В.И., Кърцелин Е.Р., Трибухин В.А., Савенко Э.С. Динамические жесткости канатов шахтных подъемных установок // Стальные канаты. – Одесса, 2003. – Вып. 3. – С. 22-25.
On animation the complete cycle of getting up of vessel is shown, through a lifting machine with the "hurrying" coils of friction.
Animation consists of 16 shots, 10 cycles, done in MP Gif Animator. Size of animation 77,6 KB
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