是起重机械的重要零部件，分锻钩和板钩两种。 Hooks are important parts of lifting machinery. They are divided into forged hooks and plate hooks. Hanging structure does not allow casting and welding. Newly used hooks must have technical verification documents such as qualified quality, or safety technical inspections should be performed and the performance can be verified before they can be used.
The technical inspection items include:
For material inspection, the hook material should be made of high-quality low-carbon killed steel or low-carbon alloy steel. Load test, lifting hook for human-driven lifting mechanism, with 1.5 times rated load as inspection load;
The hook should be able to reliably support 2 times the inspection load without falling off, and there should be a safety inspection device to prevent accidental unhooking of the lifting weight;
卸往检验载荷后，在没有任何明显的缺陷和变形的情况下，开口度的增加不应超过原开口度的0.25%。 After the hook is unloaded to the inspection load, the opening degree shall not increase by more than 0.25% of the original opening degree without any obvious defects and deformation. For surface inspection, the surface of the hook shall be smooth and clean, without peeling, sharp angles, burrs, cracks, etc .; inspection of marks and documents, including certification, rated lifting capacity, manufacturer name, inspection mark, production number, etc.