High Strength Crane Electric Rotating Hook

The hook is a very common spreader in hoisting machinery. The hook is often suspended on the wire rope of the lifting mechanism by means of pulley blocks and other components. The hook is divided into single hook and double hook according to the shape; according to the manufacturing method, it is divided into forged hook and laminated hook.

The single hook is simple to manufacture and easy to use, but the stress is not good. It is mostly used in work situations with a lifting capacity of less than 80 tons; when the lifting capacity is large, the double hook with symmetrical force is often used. The laminated hook is formed by riveting several pieces of cut steel plates. When individual plates are cracked, the whole hook will not be damaged. The safety is better, but the dead weight is relatively large. Most of them are used for heavy lifting or lifting steel ladle. On the crane. The hook is often impacted during operation and must be made of high-quality carbon steel with good toughness.

There are a wide range of hooks, generally including: shackles, rings, rings, pear-shaped rings, long rings, combined rings, S-hooks, nose hooks, American hooks claw hooks, eye-shaped sliding hooks, and rings with insurance cards Screws and chain shackles are unique, novel, high-quality, and safe, and are suitable for factories, mines, petroleum, chemical, and ship terminals. To ensure safety, quality safety factor, static load reaches 3 times. The lifting capacity ranges from 5 tons to 150 tons.

skills requirement:

1. Purchasing hooks should have the manufacturer's certificate of conformity and other technical documents before they can be used; important departments purchase hooks such as railways, ports, etc., and the hooks must be strictly inspected (flaw detection) when they leave the factory.

2. The hooks must not have defects that affect the safety performance; the hooks must not be repaired by welding; the surface of the hooks should be smooth, and there must be no defects such as cracks, folds, sharp angles, burrs, peeling, overburning, etc.

3. Two suitable positions can be selected to print the signs that are not easy to wear at a short distance from the hook opening, and the distance of the signs can be measured as the basis for detecting whether the opening degree changes during use.

4. The hook material can be made of 20 high-quality carbon steel or forged hook special materials such as DG20Mn, DG34CrMo, etc. Casting hooks are strictly prohibited. The material of plate hook is generally A3, C3 ordinary carbon steel, or 16Mn low alloy steel

5. The technical conditions of self-made hooks should meet the requirements of GB 10051.1-88～GB 10051.5-88 (new standard: GB10051.1-2010～GB 10051.5-2010)

6. The longitudinal axis of the hook piece of the plate hook must be in the rolling direction of the steel plate, and the hook piece is not allowed to be spliced.

7. Plate hooks should be riveted with countersunk rivets, and rivets should not be used to connect the high-stress bending parts of the plate hooks and lifting points.

8. Fully enclosed welding is not allowed between the plate hook laminations, only intermittent welding is allowed.

9. The hooks that have undergone overload tests should be scrapped

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