Bridge crane hook in the hook safety requirements and standards for discarding

hoist gantry crane hook is the most widely used extract devices. It bears all the load being lifted, in the course of the hook once the damage fracture easily cause a major accident. Hook damage caused is due to the breakage of friction and makes the hook overload cracks, deformation, damage, breakage. Our company technicians hook made ​​the following analysis:

First, the type of hook
1, according to the manufacturer of different ways, can be divided into forging hook hook hook and plate, plate hooks are generally used in large lifting cranes.
2, according to the different shape, a hook can also be divided into single hook and hook, hook-and medium-sized  bridge gantry crane  main hook is generally used, other multi-use single hook.

Second, the technical requirements for the safety hook
1, the hook should be a formal professional manufacturers in accordance with the technical and safety specifications hook manufacturing, the product should have a manufacturer's quality certificate.
2, the process of using a hook should always check for cracks or severe deformation, corrosion and abrasion.
3, hook a test should be conducted annually.
4, not welding defects on the hook.
5, the hook hanging objects should be set to prevent accidental decoupling locking device.

Third, the hook discard criteria

Where one of the following conditions should be scrapped,overhead gantry crane not allowed to welding strengthened.
1, the surface cracks.
2, wear dangerous section of 10% of the original size.
3, the opening degree of increase in size than the original 15%.
4, the torsional deformation over is 10 °.
5, dangerous sections and plastic deformation of the neck when the hook.
6, plate hook bushing wear up to 50% of the original size, should be scrapped bushings, pins wear more than nominal diameter of 3% -5% should be updated.
7, spindle wear plate hook up to 5% of the original size, should be scrapped mandrel be updated.

To prevent the hook fails, the above situation when the hook, the hook should be processed in a timely manner.