ISO 4306-5:2015 Bridge Crane Terminology Standard Explained
ISO 4306-5:2015 "Cranes — Vocabulary — Part 5: Bridge and Gantry Cranes" is the international standard that defines terminology for overhead traveling cranes. It standardizes terms and definitions across five categories: crane type classification, main structural components, mechanisms and systems, safety devices, and performance parameters.
Bridge Crane Type Classifications
The standard classifies overhead cranes by main girder configuration. Single-girder cranes consist of one main girder plus end carriages, with the trolley running along the lower flange. Double-girder cranes feature two main girders plus end carriages, with the trolley traveling on rails mounted on the upper flanges. By operation mode, cranes are grouped into three types: cab-operated, floor-operated (pendant), and remote-controlled. By application, the standard covers general-purpose, metallurgical, foundry, and explosion-proof variants. It also standardizes core terminology for key parameters including span, lifting capacity, work duty classification, and lifting height.
Main Structural Component Terminology
The standard defines terminology for the primary structural components of an overhead crane. The main girder is the principal load-bearing structure that supports the suspended load and the trolley weight, typically fabricated with a box section or truss construction. The end carriage connects the two ends of the main girders and houses the crane bridge wheels. The trolley is the traveling unit that moves along the main girders and carries the hoisting mechanism, comprising the trolley frame, hoist, and trolley travel mechanism. The operator cab is the enclosed compartment from which the operator controls the crane. The crane travel mechanism drives the crane along the runway rails and includes the motor, gearbox, drive shaft, and crane wheels. The trolley rail is the track mounted on the upper flange of the main girder that guides the trolley.
| Term Category | Quantity | coverage Scope |
|---|---|---|
| Model Classification | 12Items | single girder/Double Girder/Electric Hoist/Application Classification |
| Main Structure | 20Items | Main Girder/End Carriage/Trolley/Cabin / Operator Cab/Crane Rail |
| Mechanism System | 15Items | Hoisting / Lifting/Cross Travel / Trolley Travel/Long Travel / Bridge Travel/Braking |
| safety device | 8Items | Load moment limiter (LML)/Limit Switch/Buffer |
| Parameter Indicator | 10Items | Lifting Capacity/Span/Height/speed |
Mechanism Systems & Safety Device Terminology
Mechanism system terminology — the hoisting mechanism consists of a motor-reducer-drum unit, wire rope, pulley block, and hook block. The trolley travel mechanism drives the trolley laterally along the main girder rails. The crane travel mechanism drives the entire crane longitudinally along the factory building rails. Brakes are of the normally closed type, either block or disc design. Safety device terminology — the lifting capacity limiter restricts the suspended load to no more than the rated capacity. The load moment limiter (LML) monitors the load moment to prevent overload. The height limit switch prevents the hook block from striking the top of the crane. Travel limit switches prevent the crane bridge and trolley from running off the ends of their rails. Buffers absorb impact energy from collisions. Kelude Heavy Industry's technical files are compiled strictly in accordance with ISO 4306-5 terminology specifications, presented in bilingual Chinese-English format to ensure unambiguous technical exchange.
| Term Category | Typical Terms | Standard Code |
|---|---|---|
| Model Classification | single girder/Double Girder/General Purpose/Metallurgical/Explosion-proof | §2.1 |
| Main Structure | Main Girder/End Carriage/Trolley/Cabin / Operator Cab | §2.2 |
| Mechanism System | Hoisting / Lifting/Cross Travel / Trolley Travel/Long Travel / Bridge Travel | §2.3 |
| safety device | LML/Limit Switch/Buffer | §2.4 |
| Parameter Indicator | Span/Lifting Capacity/Height/speed | §2.5 |
Frequently Asked Questions
Q: Which types of overhead cranes are covered by ISO 4306-5:2015?
A: The standard covers three structural configurations: single-girder, double-girder, and electric hoist bridge cranes. In terms of operation mode, it includes cab-operated, floor-operated, and remote-controlled cranes. By application, it covers general-purpose, metallurgical, foundry, and explosion-proof variants.
Q: What are the key structural terminology differences between single- and double-girder cranes?
A: A single-girder crane consists of one main girder and end carriages, with the trolley running along the lower flange of the main girder. A double-girder crane has two main girders and end carriages, with the trolley traveling on rails mounted on the top flanges of the main girders. Terminology for the main girders, trolley rails, and travel mechanisms differs accordingly between the two configurations.
Q: What mechanism-related terminology is defined for bridge cranes?
A: The standard defines terminology for the hoisting mechanism (motor, gearbox, drum, wire rope, and hook block), the trolley travel mechanism (cross travel), the crane travel mechanism (long travel), and the braking system (shoe or disc type). Component-level terms within each mechanism are uniformly defined in the standard.
Q: How does Kelude ensure compliance with this standard?
A: Terminology used in our product manuals, technical specifications, and maintenance manuals strictly follows ISO 4306-5:2015. For exported products, the terminology on nameplates and technical documentation is provided in bilingual Chinese-English format to ensure accurate, unambiguous technical exchange between domestic and international stakeholders.
