In underground mining a hoist or winder is used to raise and lower conveyances within the mine hoists are normally powered using electric motors, historically with direct current drives utilizing Ward Leonard control machines and later solidstate converters (), however modern large hoists use alternating current drives that are variable frequency controlled.
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Get PriceThe most visible feature of a mine shaft is the headframe (or winding tower, poppet head or pit head) which stands above the shaft. Depending on the type of hoist used, the top of the headframe will either house a hoist motor or a sheave wheel (with the hoist motor mounted on the ground). The headframe will also contain bins for storing ore being transferred to the processing facility.
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Get PriceA mine elevator cage with a mass of tons empty is descending at a rate of 32 km/hr when the hoist mechanism jams and stops suddenly. If the cable is steel with a crosssectional area of cm2 and the cage is 1500 meters below the hoisting drum when the drum jams, which of the following most nearly equals the stress in the cable?
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Get PriceDESIGN OF MINE SHAFT ELEVATOR Dr. Gerdemeli , Candas , Unalan Faculty of Mechanical Engineering Istanbul Technical University Turkey1,2,3 Abstract: This study is focused on basic design of mine shaft elevator. After discussing design basic of mine shaft elevators and
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Get PriceGlossary of Mining Terminology After Damp Gasses resulting from underground combustion, normally carbon monoxide. This is a loose term implying any fatal gas in a mine after an explosion or fire. Air Shaft A vertical opening into a mine for the passage of air. Airway Any passage in a mine along which an air current moves. Some passages are
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Get PriceAssume the density of air is ρ = kg/m3, and neglect the weight of the ropes and the cage. 0; Balloons are often filled with helium gas because it weighs only about oneseventh of what air weighs under identical conditions. The buoyancy force, which can be expressed as F b = ...
Get Pricemaximum weight of cage mining laserenatabe. maximum weight of cage mining How to Calculate the Size of a Mine Hoisting System 911, If the shaft is inclined, the stress in the rope due to the weight hoisted will vary with the sine of the angle of inclination, thus: The maximum length of a drum, aside from question of room, [24/7 Online]
Get PriceIn some cases a counter weight is required to balance a cage or a skip. Cages. There are many different variations of cages but the general construction of them is similar. They are constructed with a headframe and a travel compartment. The size of the cage depend on the personnel requirements for the mine and the size of the constructed shaft.
Get Pricea mine cage weight 12KN and can carry a maximum load of 20 KN. the average frictional resistance of side guide is 550N. what constant cable tension is required to give a loaded cage an upward velocity …
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