Views: 40 Author: Site Editor Publish Time: 2025-03-09 Origin: Site
The following is a comprehensive review of the main standards and technical requirements related to steel ropes:
I. National Standard System
General technical conditions
GB/T 20118-2017: Covers general technical requirements of wire ropes, including materials, manufacturing processes, mechanical properties and inspection methods.
GB/T 34198-2017: For crane wire rope, specified structure (diameter 6-70mm), accept method and maintenance requirements.
Special on-site standards
GB 8903-2024: Inspection and performance requirements for wire ropes for elevators 6.GB/T 8918-2006: Inspection standards for wire ropes for important purposes, including key parameters such as chemical composition and tensile strength 6.
ii. Classification and technical requirements
1. Classification of rope core materials
Hemp core/cotton core: soft lubricated, but poor in high temperatures and poor pressure resistance.
Asbestos core: suitable for high temperature environments, but with weak pressure resistance.
Metal Core: Resistance to high temperature and high pressure, but less flexibility.
2. Structural feature classification
Differences in twisting method: distortions of right hand intertwining, distortions of left hand intertwining and other same/reverse distortion types.
Contact method: Point and contact points (easy to wear), line contact (good waterproofness), surface contact (high strength).
3. Safety and usage specifications
Safety factor requirements
The insurance factor for hanging ropes is 5-8 times, and the insurance factor for crane ropes is 8 times.
The braid length must be 15 times the rope diameter and ≥300mm, and the strength must exceed more than 75% of the rupture tension.
, Install and Cancel Standard
The pulley diameter must match the wire rope diameter (for example, the rope diameter ≥12 times) 7.
Wire break judgment: outer layer wear ≤40% diameter; the number of broken wires within 6 times the diameter of the rope is limited (cross twist ≤2 chains, straight twist ≤1 chain) 8.
1. Technical parameters and maintenance
Mechanical Characteristics
2. Tensile strength grade covers 1470-1970N/mm².
Breaking tensile tests and fatigue tests are mandatory inspection items.
Maintenance requirements
Oil immersion is required once a year and contact with hot objects or charged corpses is prohibited.
Storage must be ventilated and dry to prevent corrosion or physical damage7.
3. Test Method
Summary Test: Chemical composition analysis, repeated bending test, elastic elongation determination, etc. 6.
Failure Analysis : Crack corrosion analysis is used to determine the cause of wear or rupture6.
With the above standard system, the appropriate wire rope type can be selected for different application scenarios (such as lift, lift, elevator) and can ensure safe and compliant use.
