Metal ladder quality appraisal

Metal ladder is a kind of ladder made of metal material (such as aluminum alloy, stainless steel or carbon steel). It has high load-bearing capacity, durability and stability. It is widely used in construction sites, electrical maintenance, interior decoration, high-altitude operations, warehouse management and other occasions to provide a safe and reliable way to climb.
In metal ladder quality appraisal cases, Zhongke Testing can provide metal ladder quality appraisal services.

Classified by material: aluminum ladder, stainless steel ladder, steel ladder
Classified by structure: straight ladder, folding ladder, small hinged ladder
Classified by purpose: platform ladder, frame ladder, checkers ladder

GB/T 17889.4-2012 Ladders Part 4: Ladders with single or multiple hinges
GB/T 17889.5-2019 Ladders Part 5: Telescopic ladders
GB/T 17889.2-2021 Ladders Part 2: Requirements, tests and markings
GB/T 17889.3-2012 Ladders Part 3: Instructions for use
GB/T 17889.1-2021 Ladders Part 1: Terminology, types and functional dimensions
GB/T 17889.6-2019 Ladders Part 6: Movable platform ladders

was entrusted by a People's Court to conduct an appraisal and analysis on the cause of the breakage of the metal ladder involved in the case.
analysis results: The
analysis expert team conducted an on-site investigation and inspection of the "metal ladder" involved in the case, conducted a comprehensive quality technical analysis, and made the following suggestions and conclusions:
After the compression pin of the ladder involved in the case is fixed, the hinge compression pin can still be moved and is not in a locked state. This design flaw is the main reason for the fracture of the ladder involved in the case.