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Safety Technical Requirements For Hooks Jul 31, 2017



Hook is the most widely used device in cranes. It bears the full load of the crane, in the process of use, the hook once damaged and broken easily caused a major accident. The cause of the breakage of the hook caused by friction and overload makes the hook produce crack, deformation and breakage. Central China's technical staff to build the hook to do the following analysis:

Type of Hook

1, according to the different manufacturing methods, the hook can be divided into forged hooks and plate hooks, the plate hook is generally used in heavy cranes.

2, according to the shape of different, hook can also be divided into single hook and double crochet, Hoist Hook large and medium-sized crane main hook is usually used double crochet, the other many use single hook.

II. Safety Technical requirements of hooks

1, the hook should be a formal professional manufacturers in accordance with the hook Technology and safety requirements of the production of manufacturing, Hoist Hook products should have a manufacturer's quality certificate.

2, the use of the process should often check the hook has no cracks or serious deformation, Hoist Hook corrosion and wear phenomenon.

3. Hook should be tested every year.

4. The defects on the hook shall not be welded.

5. The hook shall be provided with a locking device to prevent accidental decoupling of the suspended material.

Third, the standard of scrap hook

Any one of the following circumstances should be scrapped, Hoist Hook no repair welding to strengthen.

1. When there is a crack on the surface.

2, dangerous section wear up to the original size of the 10﹪.

3, the opening degree increases 15 ﹪ than the original size.

4, torsional deformation over 10°.

5, dangerous section and hook neck when plastic deformation.

6, plate hook bushing wear up to the original size of the 50﹪, should scrap bushing, Hoist Hook the peg wear exceeds the nominal diameter of the 3﹪-5﹪ should be updated.

7, plate Hook mandrel wear up to the original size of the 5﹪, should be scrapped mandrel, to be updated.

In order to prevent the failure of the hook, in the case of the hook, the hook should be handled in time.

The crane's hook size and its function and use skill

Small load (3 ton crane below) hook, most directly fixed on the hoist. In most cases, Hoist Hook the hook itself weight does not pull the cable closer to overcome the friction of the actuator and the rotor of the drawing motor

Small load (3 ton crane below) hook, most directly fixed on the hoist. In most cases, the weight of the hook itself does not pull the cable closer to the friction of the actuator and the rotor of the drawing motor, so some extra weight is required.

Port revolving cranes, which usually carry a weight of 2.5 tons and 3 tons, are equipped with a hook head, between the hook and Hook head, with a long about 1/2 meters of Contie chain, Hoist Hook so that the hook has a lot of movement.

The purpose of adopting the spring hook head is to reduce the effect of the heavy striking force on the hook. If the steel cable with sufficient elasticity is used, the spring hook head is not used, and it is only used in light forging cranes.