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1·When finish hoisting operate multiple directional value lock the hook, and then take back outrigger.

吊装完成后要操作多路换向阀锁上锁钩，然后收回支腿。

2·The utility model provides a novel closed hook, which is used for the hoisting industry and the transportation industry.

本实用新型提供一种新型封闭式吊钩装置，用于起重运输业。

3·Operating multiple directional value can separately control the fore and aft motion of swing arm oil cylinder, outrigger oil cylinder or hook oil cylinder to finish working of hoisting or unloading.

操作多路换向阀可分别控制摆臂油缸、支腿油缸或锁钩油缸的伸缩运动，完成吊装或卸料工作。