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head sheave

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Description

Is set on the top of the derrick or blind shaft, retainer hoisting cable guide wheel. The top of the mine shaft headframe adjust the crown block of wire rope movement direction, he is bearing the weight of the weight of cage, bucket or vertical shaft skip, is often seen as a sign of mine. According to the coal mine safety regulation, lifting equipment of the minimum diameter and diameter of wire rope pulley ratio should be consistent with: lifting device of drum and inoue circumference Angle is greater than 90 ° pulley, shall not be less than 80; Circumference Angle less than 90 ° pulley, shall not be less than 60; Downhole circumference Angle is greater than 90 ° pulley, shall not be less than 60; Wai hold less than 90 ° Angle of pulley shall not be less than 40

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