(1) The ore body and surrounding rock are hard:
(2) The deposit conditions are unstable, and the thickness, inclination and shape of the ore body vary greatly, which requires multiple mining methods;
(3) There are often geological structures such as faults, folds, veins penetrating into ore bodies, fault fracture zones, etc., which bring great difficulties to mining and prospecting work [1] . These characteristics make the metal mine and coal mine strata control in comparison with its own laws. Mine pressure is often referred to as ground pressure in metal mines.
During the mining process of metal ore, the mine pressure activity is closely related to the mining method. When using the room-column mining method, it generally shows that the top column and the column collapse, which leads to the collapse of the upper plate rock, resulting in large-scale mining pressure activities; the caving mining method is mainly manifested in the mining level roadway (squatting road, near road) damage.
Water Pumps are machines that deliver or pressurize a liquid. It transfers the mechanical energy of the prime mover or other external energy to the liquid, increasing the energy of the liquid, mainly for transporting liquids including water, oil, acid and alkali, emulsion, suspoemulsion and liquid metal.
Liquids, gas mixtures, and liquids containing suspended solids can also be delivered. The technical parameters of the pump performance include flow, suction stroke, lift, shaft power, water power, efficiency, etc.; according to different working principles, it can be divided into volume pump, vane pump and other types. The volumetric pump uses its change in the volume of the working chamber to transfer energy. The vane pump uses the interaction of the rotating blades and water to transfer energy. There are centrifugal pump, axial Flow Pump and mixed flow pump.
Water Pumps
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