Overhead crane parts scrapped criterion of China

 overhead crane are consists of many overhead crane parts, crane lifting accessories that are substandard quality must constitute unqualified overhead crane.

Major overhead crane parts can be divided into: operation equipment, slewing platform, walking device, mobile equipment and control system.

• The operation equipment includes hook, boom, pulley, wire rope.
• The slewing platform including rotary rolling plate, winding, platform structure, walk.
• Walk institutions including caterpillar or tires, driving wheel, the gear reducer.
• Mobile devices including diesel engine, fuel tank, main motor or pump.
• Control system including control software, displays, sensors.

The lifting hook,wire rope,drum,brake and couplings are five important components of crane.Any component failure can cause significant losses.

The scrapped criterion of mainly overhead crane parts

hook

• crack
• dangerous section wear of the size of the original 10%
• the opening of an increase of 15% over the original size
• torsional deformation of more than 10%
• dangerous section or hook neck produce plastic deformation
• board hook bushing wear up to 15% of the original size should be scrapped
• plate hook spindle wear up to 5% of the original size should be scrapped (hook on the defect repair should not be weld)

Wire rope

The specific scrapped criterion is in the article:How to select crane wire rope?

drum

• crack
• drum wear up to 20% of the original wall thickness

Brake wheel

Brake wheel in one of the following situations should be scrapped

• crack
• lifting, luffing mechanism of brake wheel, wheel rim thickness wear 40% of the original thicknessand other institutions of brake wheel
• wheel rim thickness wear up to 50% of the original thickness
• wheel surface uneven height difference of up to 15 mm, if you can repair, repair after rim thickness should comply with the above article 2 or 3 requirements

Gear coupling

Gear coupling in the following situations should be scrapped:

• crack
• broken teeth
• lifting mechanism and luffing mechanism unbalanced wear of tooth thickness wear up to 15% of the original tooth thickness, other thick tooth structure wear up to 20% of the original tooth thickness

Overhead crane parts’ scrapped criterion is based on government standard of China,If overhead crane parts have problem ,industry must be timely replacement to ensure operation safety.

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