COAL CUTTING MACHINE
Introduction:
Coal cutting machine is used in bord and pillar mining method of underground coal mining to make Undercut, Overcut or Middlecut to provide free face for the blasting operation.
Development by CCM:
The headings are Undercut, Overcut or Middle Cut by a coal cutting machine and shot holes are then drilled and charged with explosives and blasted. Blasted coal is hand loaded on to scraper chain conveyors which transport the coal from the face to a central belt conveyor.
Construction:
Coal cutting machine may be under-cutting, over-cutting or middle-cutting types. Commonly, undercutting chain type coal cutting machines are used. In watery mines middle-cutting or over cutting machines are preferred. Where roof is to be a formed overcutting machine are employed. Normally a machine gives an undercut in a heading of 4.2 m width in about 15 minutes. But, their overall performance depends on the organization to secure higher utilization. In India, the average output per coal cutter per month in 1980 was of the order of 2500 tonnes.
Coal cutting machines are powered by electric or air motors. The electric motors may be operated by A.C. supply or by D.C. supply at 550 volts. The power is supplied through 4/5 core trailing cable of 91.44 m length which is carried in the body of the machine. Air motors are run by compressed air at 3.51 kg/cm¬2 at the face requiring 0.7079 m3 of air per B.H.P. The rpm of the air turbine is between 1500 to 2000 and the hp developed is 40-60 hp.
Coal cutting machine is used in bord and pillar mining method of underground coal mining to make Undercut, Overcut or Middlecut to provide free face for the blasting operation.
Development by CCM:
The headings are Undercut, Overcut or Middle Cut by a coal cutting machine and shot holes are then drilled and charged with explosives and blasted. Blasted coal is hand loaded on to scraper chain conveyors which transport the coal from the face to a central belt conveyor.
Construction:
Coal cutting machine may be under-cutting, over-cutting or middle-cutting types. Commonly, undercutting chain type coal cutting machines are used. In watery mines middle-cutting or over cutting machines are preferred. Where roof is to be a formed overcutting machine are employed. Normally a machine gives an undercut in a heading of 4.2 m width in about 15 minutes. But, their overall performance depends on the organization to secure higher utilization. In India, the average output per coal cutter per month in 1980 was of the order of 2500 tonnes.
Coal cutting machines are powered by electric or air motors. The electric motors may be operated by A.C. supply or by D.C. supply at 550 volts. The power is supplied through 4/5 core trailing cable of 91.44 m length which is carried in the body of the machine. Air motors are run by compressed air at 3.51 kg/cm¬2 at the face requiring 0.7079 m3 of air per B.H.P. The rpm of the air turbine is between 1500 to 2000 and the hp developed is 40-60 hp.
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| FIGURE 1
The other types of coal cutting machine especially designed for bord and pillar working are: (1) Arc-Shearing (Arcwall-and-shearing) coal cutters and (2) Arcwall coal cutter.
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| FIGURE 2 The Arc-shearing machines may be track mounted or crawler mounted. ARCWALL COAL CUTTERS The arcwall coal cutters (figure 3) make their cut in a plane parallel to the rails they stand on or the floors their crawlers rest on. The machines can also sump in or out, keeping the jib at a constant angle.
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