Mining or in situ disintegration of hard material – Automatic control; signaling or indicating – Of hard material disintegrating machine
Patent
1984-08-21
1987-03-10
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Automatic control; signaling or indicating
Of hard material disintegrating machine
299 12, 299 81, 299 42, E21C 2736, E21C 3522, E21F 502
Patent
active
046486593
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The invention relates to mining engineering, and more specifically it deals with a method and hydraulic system for controlling the supply of fluid to a combine for extracting minerals.
DESCRIPTION OF THE PRIOR ART
At present combines for extracting minerals are widely used which have a dust suppression and electric motor water cooling system, the water being supplied from the gallery by a constant capacity pumping unit through a line laid alongside the main conveyer. Water supplied to the combine through respective pipe-lines and also partially through the water jackets of electric motors is fed to the nozzles of the dust suppression system and is sprayed therethrough to broken coal. However, with such a method of water supply, the constant capacity pumping unit would normally give a high flow rate designed for the maximum output of the combine which can only be reached at maximum movement speed of the combine. As the combines would normally operate at speeds lower than the maximum speed of feed, water would be supplied to the combine in an amount which is much greater than that necessary for efficient dust suppression. This is harmful for both the working conditions of the operating personnel and quality of the coal being extracted.
The combine also has a hydraulic drive for moving the combine along the face, comprising a pump installed on the combine and a hydraulic motor supplied by this pump. The pump is rather complicated requiring an individual hydraulic system for supplying fluid thereto, and not infrequently it is cause of lower output of the combine. Oil or oil suspension is generally used in the hydraulic mechanism as fluid, whereas water or water with additives improving dust wetting capacity is used for the dust suppression. Thus individual systems for supplying fluids are required thus making the combine more complicated and increasing its size which is of particular importance in working small-thickness seams.
SUMMARY OF THE INVENTION
The invention is based on the problem of providing a method and hydraulic system for controlling the supply of fluid to a combine for extracting minerals in which a hydraulic system of a combine simple in design would provide for controlling the amount of fluid fed to the dust suppression system in accordance with the speed of the combined movement along the face.
The invention resides in a method for controlling the supply of fluid to a combine for extracting minerals, comprising feeding the fluid positively and alternately to hydraulic cylinders of a drive for moving the combine along the face for alternately actuating them, and also to a dust supression system. According to the invention, the fluid for the power hydraulic cylinders and the fluid for the dust suppression is one and the same fluid which is supplied from the hydraulic cylinders, after actuation thereof, at a pre-set pressure to the dust suppression hydraulic system for emergence of the fluid under the flowthrough conditions.
The use of one and the same fluid, fed from the outside under the flowthrough conditions, for actuating the drive of the combine movement and for subsequent use in the dust suppression hydraulic system makes it possible to reduce the combine size (owing to the installation of the pump in the gallery) and to supply the dust suppression system with clean fluid at a desired pressure and in an amount corresponding to, and depending on the combine movement speed, i.e. on the amount of a mineral being extracted.
A pre-set pressure in the dust suppression hydraulic system is preferably maintained at a varying fluid flow rate depending on the speed of the combine movement along the face.
Maintaining a pre-set pressure in the dust suppression hydraulic system at a varying fluid independent flow rate of the combine movement speed ensures the maximum possible efficiency of dust suppression which can only be achieved at the pre-set pressure.
The fluid preferably comprises water in a composition used for the dust suppression.
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REFERENCES:
patent: 3980338 (1976-09-01), Weber
Masovich Felix Z.
Starichnev Vladimir V.
Goodwin Michael A.
Gosudarstvenny Proektno-Konstruktorsky I Experimentalny Institut
Novosad Stephen J.
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