Gravity control hoist that opens and shuts

The utility model discloses a gravity control hoist that opens and shuts has solved the problem of the hoist damage with high costs and easy that current overhead stacking crane exists when hoist and mount box heavy object. Including to be provided with four davits that the structure is the same respectively on the hoist hanging beam have a round pin axle in the lower extreme cross -under of davit, having a front end swing arm in that the front end of round pin axle is articulated, have a rear end swing arm in that the rear end of round pin axle (6) is articulated, the cross -under has a round pin axle down between the lower extreme of the lower extreme of front end swing arm and rear end swing arm, sells the epaxial fixed balancing weight that is provided with under, the front end of round pin axle is fixed be provided with the taper before the shifting block, the rear end of selling down spool fix be provided with the taper after the shifting block, be provided with by the jack -up box between the lower extreme of two davits. The utility model discloses have provide one kind unattended, low in manufacturing cost need not power to safe and reliable's hoist.