The present invention relates to a slab fall prevention device of the overhead crane, which can prevent the fall by detecting whether the slab is normally mounted on the lifting portion of the overhead crane,;A cylinder 14 fixed to the tongs 114, a piston 16 embedded in the cylinder 14 and connected to the weight 116 via one side of the sensing cable 30, and the piston 16 A fusion slab detection unit 10 having a rod 18 fixed integrally to the other side and having a fusion slab 120 'positioned on the movement path, and installed on the movement path of the sensing cable 30, Limit switch 40 which is operated by the operating piece 34 fixed to the sensing cable 30, including the force applied to the sensing cable 30 by the weight of the piston 16 and the elements connected thereto Is set smaller than the force applied to the sensing cable 30 by the weight 116, the operation piece 34 to operate when the rod 18 is blocked by the fusion slab 120 '. The alarm bell is operated by maintaining the contact state.
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