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Maintenance Method Of Hook Jul 19, 2017

Hook material should have a certain tensile strength, yield than to small, to be safe and reliable, the selection of the hook material shall be in accordance with the relevant provisions of the national standards to choose high-quality low carbon sedative steel or low alloy steel; Hook general application of gb/t700-88 "ordinary carbon structural steel technical conditions" in the provisions of the q235a, C3 Steel, or gb/t1591-94 "low alloy structural steel technical conditions" in the 16Mn steel.

Hoisting fittings-Forged hooks-general application of gb/t699-88 (high quality carbon structural steel and general technical conditions 20 steel).

In addition, some hooks for cold bending, hot forging and welding, in order to eliminate cold stress, thermal stress and welding stress, but also must carry out appropriate heat treatment, Lifting Hooks such as the quality control treatment.

Hooks are generally forged or stamped, but also with a number of plates riveted, can not be used to create lifting hooks.

The former is called the Forging hook, the latter calls the hook. The material of forging hook is commonly used in 20th # High quality carbon steel (open hearth);

The material of the plate hook is commonly used for 20th high quality carbon steel, Lifting Hooks and the thickness of the plate is not less than 20 mm.

After forging or stamping, the hook must be treated with accurate annealing to eliminate the residual internal stress and increase its toughness, and the surface hardness should reach 95~135HB.

When the hook is subjected to load, Lifting Hooks the internal crystal structure is partially produced by sliding, and the residual stress is not restored after unloading, so the so-called cold hardening phenomenon is formed.

In order to eliminate residual stress in hardened area and restore original toughness, Lifting Hooks accurate annealing process is also needed.

The hooks used in the construction of transmission lines shall be treated in accordance with the relevant regulations in addition to the regular inspection.

The forged single hook is commonly used in transmission line construction.

Main maintenance method of hook:

1, for the main force components, rings, rotary lock, ear plate and rigging shackle, Lifting Hooks in the normal use of clear conditions, at least every 3 months should be checked once, no cracks and serious deformation.

2, Hook in the use of the process, if the rotation is not flexible or not in place, you should check the adjustment of the nut, and then check the following parts:

① pawl tension springs are damaged, such as damage, should be replaced;

② transmission mechanism whether or not the card lag, such as card lag, is poor lubrication, should be in the transmission mechanism of the active connection to add lubricating oil (or grease). If the guide pins are too tight, loosen the nuts properly. In the case of loose connection, transmission pipe or other rod deformation, Lifting Hooks it should be corrected;

③ Buffer Spring tensile volume is too small, if too small, should shorten the buffer spring connection wire rope length.

3, the hoisting process should be smooth lifting, to avoid the hook and crane or other equipment such as collision and deformation.