classification of hook groups

classification of hook groups

Use, Manufacture And Classification of Hook Groups

There are many types of hooks. Generally speaking, they can be divided into forged hooks and laminated hooks according to different manufacturing methods; and they can be divided into single hooks and double hooks according to different shapes.

Hook manufacturing method

According to the manufacturing method, it is divided into forged hooks and laminated hooks

According to the shape, it is divided into single hooks and double hooks

Single hooks are simple to manufacture and convenient to use, but the force is not good. They are mostly used for lifting weights below 80 tons; double hooks with symmetrical force are often used when the lifting weight is large.

Laminated hooks are made of riveted steel plates cut and formed. When cracks appear on individual plates, the entire hook will not be damaged. It has better safety, but the deadweight is large. It is mostly used on cranes with large lifting weights or lifting molten steel buckets.

Hooks are often impacted during operation and must be made of high-quality carbon steel with good toughness.

Use and production of hooks

The hook group should be forged from a whole piece of steel (generally No. 20 high-quality carbon cable steel is used), and annealing treatment is required, and the hardness requirement is 95-135 (HB).

The surface of the hook group should be smooth, without defects such as peeling, notches, sharp angles, cracks, etc., and it is not allowed to repair the damaged hook group by welding to avoid brittle fracture accidents.

During lifting, the sling should be hooked to the bottom; if the hook group is directly hooked in the lifting ring of the component, the hook group should not be hard or twisted.

There are single hook and double hook types of hook groups. Single hooks are generally used for lifting work, among which the main dimensions and lifting weight of the hook group with ring.

If the hook group is deformed and cracked, it should be scrapped. When the wear reaches 10%, it should be downgraded or replaced.

Hook group classification

Hook group is a lifting tool often used in the lifting process. As we all know, hook group is divided into single hook group and double hook group. Single hook group is often used in conjunction with slings, and sometimes in conjunction with hook group frame; double hook group is only used on cranes.

There are many types of hooks, including: unloading hooks, lifting rings, round rings, pear-shaped rings, long lifting rings, combination lifting rings, S hooks, nose hooks, American lifting hooks, ram hooks, eye-shaped sliding hooks, lifting ring screws with safety cards, chain shackles, which are unique, novel, high-quality and safe.

Suitable for factories, mines, petroleum, chemical industry and ship docks, etc. Ensure safety, quality safety factor, static load reaches 3 times. Lifting capacity ranges from 5 tons to 150 tons

Forged hooks

Forged hooks are also divided into single hooks and double hooks. They are generally made of 20, 20MnSi steel forged as a whole. Because the single hook is eccentric, the force is not as favorable as the symmetrical force of the double hook, so small and medium-sized cranes below 80 tons mostly use single hooks, and large-tonnage cranes above 80 tons mostly use double hooks. This type of hook is widely used and has formed a series.

In addition to understanding the types and uses of hooks, the safety and stability of the hooks also play an important role in lifting operations, so daily safety inspections and maintenance of the hooks should be performed regularly to ensure safe operations. Generally speaking, daily inspections and maintenance of hooks include the following:

(1) Clean the crane hook assembly with a non-corrosive organic solvent, wipe it dry and inspect it carefully. If cracks are found, replace it immediately and do not perform repair welding.

(2) Check the hook opening and the wear of the dangerous section.

(3) Check whether the pulley groove and rim are evenly worn, whether the wire rope matches the groove, and whether the pulley is loose or shaking.

(4) Ensure that the rotating part of the hook can rotate freely and the gap cannot be too large. If there is difficulty in rotation or jamming, check whether the bearing or sleeve is damaged or lubricated insufficiently.

(5) Check the overload damage of the main hook.

(6) Check the hook guard plate, crossbeam and other parts. If the guard plate is severely worn, it can be repaired and re-bored. If a new part is replaced, it is necessary to ensure that the mechanical properties of the material meet the requirements.

(7) Check the anti-unhooking device.

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