During application, and mine car runs down at emergency overspeed, two speed measurement switches send out start signal through single chip microcomputer, alarm loudspeaker sounds, at the same time, electromagnetic release spigot acts to lay down wire rope, under reverse torsional force of the pulley, debarring wire rope tensions at certain horizontal height to wait, when the mine car arrives and tracts the wire rope, wire rope released in high damping state absorbs inertia force of the mine car, so mine car may stop safely within certain distance.

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