Load safety requirements for crane hook sets
The crane hook group is an important part of the lifting machine, which is divided into two types: the forged crane hook and the board hook. The suspension does not allow for casting and welding. The hooks used for new investment must have technical certification documents such as quality approval. Otherwise, safety technical inspection should be carried out to find out that the performance is qualified before use. Technical inspection items include: material inspection, hook material should be made of high quality low carbon killed steel or low carbon alloy steel. For the load test, the human-driven lifting mechanism uses a crane hook sets with a rated load of 1.5 times as the inspection load.
The crane hook sets has a super load capacity and a safeguard device that prevents accidental unhooking of the hoist. After the crane hook sets is unloaded to the inspection load, the opening shall not increase by more than 0.25% of the original opening without any obvious defects and deformation. Surface inspection, the surface of the hook should be smooth, no peeling, sharp angle, burrs, cracks, etc.; marking and document inspection, including certificate, rated lifting capacity, manufacturer name, inspection mark, production number, etc.