Interpretation of the ISO 4306-5:2015 Standard, “Vocabulary for Bridge Cranes”
📌ISO 4306-5:2015, “Cranes—Terminology—Part 5: Overhead Cranes,” is an international standard for the terminology of overhead cranes. The standard harmonizes the terminology and definitions for overhead cranes, covering five categories of terms: type classification, main structures, mechanisms, systems, safety devices, and performance parameters.
Model Classification Terminology
The standard classifies bridge cranes based on their main girder structure into two types: single-girder cranes, where the trolley runs along the lower flange of the main girder and end beams; and double-girder cranes, where the trolley runs on tracks on the upper flange of the two main girders and end beams. Based on the method of operation, they are classified into three types: cab-operated, ground-operated, and remote-controlled. Based on application, they are classified into general-purpose, metallurgical, foundry, and explosion-proof types. The standard unifies the definitions of core terminology for each model, including parameters such as span, lifting capacity, duty cycle, and lifting height.
Key Structural Terms
Terminology Standards for Major Structural Components of Bridge Cranes—The main girder, which bears the load and the weight of the trolley, is a primary load-bearing structure typically constructed with a box section or truss structure. The end beams connect the two ends of the main girders and are equipped with the main crane wheels. The trolley runs along the main girder; the mobile trolley, which carries the hoisting mechanism, consists of a frame, the hoisting mechanism, and the trolley travel mechanism. The operator controls the bridge crane from an enclosed operator’s cab. The main girder travel mechanism drives the crane along the factory tracks and consists of a motor, a gear reducer, a drive shaft, and wheels. The trolley track is laid on the upper flange of the main girder to support the trolley’s movement.
| Term Categories | Quantity | Coverage |
|---|---|---|
| Model Categories | 12 items | Single-Girder/Double-Girder/Electric Hoist/Classification by Application |
| Main Structure | 20 items | Main Girder / End Girder / Trolley / Operator's Cab / Track |
| Organizational System | 15 items | Hoisting / Trolley Travel / Gantry Travel / Braking |
| Safety Devices | 8 items | Torque Limiter/Limit Switch/Buffer |
| Specifications | 10 items | Lifting Capacity / Span / Height / Speed |
Terminology for Institutional Systems and Safety Devices
Mechanical System Terminology—The hoisting mechanism consists of a motor, a gear reducer, a drum, a wire rope, a pulley block, and a hook. The trolley travel mechanism drives the trolley to move laterally along the main girder track. The main girder travel mechanism drives the entire crane to move longitudinally along the shop tracks. Brakes are normally closed block-type or disc-type brakes. Safety Device Terminology—The load limiter restricts the lifted load to not exceed the rated capacity. The moment limiter monitors the lifting moment to prevent overloading. The height limiter prevents the hook from striking the top of the hoist. The travel limit switch prevents the main or trolley hoist from running off the end of the track. The buffer absorbs the impact energy from collisions. Krud Heavy Industry’s technical documents are compiled in strict accordance with the ISO 4306-5 terminology standards as bilingual Chinese-English parallel texts to ensure unambiguous technical communication.
| Term Categories | Typical Terms | Standard Number |
|---|---|---|
| Model Categories | Single-girder / Double-girder / General-purpose / Metallurgical / Explosion-proof | §2.1 |
| Main Structure | Main Girder/End Girder/Trolley/Operator's Cab | §2.2 |
| Organizational System | Hoisting / Trolley Travel / Gantry Travel | §2.3 |
| Safety Devices | LML/Limit Switch/Buffer | §2.4 |
| Specifications | Span/Lifting Capacity/Height/Speed | §2.5 |
Frequently Asked Questions
Q: What types of bridge cranes does ISO 4306-5:2015 cover?
Answer: These include three structural types: single-girder, double-girder, and electric hoist bridge cranes. By operating method, they include cab-operated, floor-operated, and remote-controlled models. By application, they include general-purpose, metallurgical, foundry, and explosion-proof models, among other specialized types.
Q: What are the main differences in structural terminology between single-girder and double-girder bridge cranes?
Answer: A single-girder crane consists of one main girder and end beams; the trolley runs along the lower flange of the main girder. A double-girder crane consists of two main girders and end beams; the trolley runs on tracks on the upper flanges of the main girders. There are differences in the terminology used for the main girders, trolley tracks, and hoisting mechanisms between the two types.
Q: What terms are used to describe the mechanical systems of a bridge crane?
Answer: Hoisting mechanism (motor + gear reducer + drum + wire rope + hook assembly), trolley travel mechanism (lateral movement), bridge travel mechanism (longitudinal movement), and brakes (block-type or disc-type). The terminology for the internal components of each mechanism is uniformly defined in the standard.
Q: How does Krude Heavy Industries comply with this standard?
Answer: The terminology used in the product specifications, technical specifications, and maintenance manuals strictly complies with ISO 4306-5:2015. The terminology on the nameplates and in the technical documentation for exported products is presented in both Chinese and English to ensure accurate and unambiguous technical communication both domestically and internationally.
