Qverhead bridge crane, as the core lifting equipment for material handling in modern industry, are widely used in workshops, warehouses, docks and other places for material hoisting and loading/unloading operations.
MOTCRANE will systematically expound the classification system and technical features of bridge cranes from four dimensions:
- Structural of main beam
- Drive brand
- Application environment
- Functional characteristics
I. Classification by Main Beam Structure
♦ Single Girder Overhead Crane
- Structural features：Composed of one main girder, two end girders and an electric hoist. The main girder adopts I-beam or box girder structure.
- Technical parameters：Lifting capacity usually ≤ 20 tons, span ≤ 35 meters, working level A3-A5.
- Core advantages：Light weight (30% lighter than double-girder), low cost, convenient installation and maintenance.
- Applications：Light workshops, warehouses, assembly lines and other intermittent operation sites.
♦ Double Girder Overhead Crane
- Structural features：Two parallel main beams are rigidly connected by end beams, and are equipped with independent large vehicle running mechanisms.
- Technical parameters：The lifting capacity can reach 500 tons, the span can reach 50 meters, and the working level is A5-A8.
- Special design：It can be integrated with electromagnetic or grab hoisting tools and is equipped with a double trolley system.
- Applications：Heavy-duty working conditions such as steel and metallurgy, shipbuilding and heavy industry, and large equipment manufacturing.
II. Classification by Drive Motor & Reducer Brands
♦ Combined Drive
Each side of the end beam has a drive unit, which drives the wheels on both sides through independent motors, reducers, brakes, and drive shafts.
Mainstream brands：Xindali (motor), Tailong (reducer), Dongli (reducer)
♦ Three-in-one Drive (Mainstream Configuration)
Each side of the end beam is equipped with a drive unit, which drives the wheels on both sides through a three-in-one reducer motor and a transmission shaft.
Technical advantage：Modular design, strong fault isolation, and easy maintenance.
Mainstream brands：SEW, Rossi, Siemens, ABB, Flender…
III. Classified by usage environment
|
Type |
Protection Grade |
Special Design |
Application Field |
|
General Type |
IP23 |
Basic insulation protection | Conventional workshop |
|
Metallurgical Casting Type |
IP54 |
Heat radiation protection plate, double braking system | Steel smelting workshop |
|
Explosion-proof Type |
ExdIIBT4 |
Flameproof motor, non-sparking components | Petrochemical, military industry |
|
Corrosion-resistant Type |
IP55 |
316 stainless steel material, epoxy coating | Marine engineering, chemical industry |
|
Low-temperature Type |
-40℃ |
Low-temperature steel, anti-freezing lubricating oil | Cold chain logistics, polar scientific research |
IV. Classified by functional characteristics
♦ Electromagnetic overhead crane
Integrated electromagnetic suction cup lifting gear, equipped with cable drum system
Suitable for handling ferromagnetic materials such as steel plates and profiles
♦ Grab bucket overhead crane
Equipped with a grab opening and closing mechanism, it supports bulk material handling operations.
Typical applications: Coal terminals, grain storage centers
Equipped with PLC control system and laser positioning device
It has the functions of automatic anti-sway, precise positioning (±1mm), and load monitoring.
V. Analysis of technical selection factors
Span and gauge：The column spacing(span) of the factory building and the installation height for overhead cranes need to be determined. For double-girder cranes, the maintenance passage also needs to be considered additionally.
Lifting height：The limit position of the hook should meet the passage requirements of the highest equipment.
Working level：（A3~A8）The utilization level of the mechanism and the load state should be determined according to the FEM/ISO standards.
Control mode：Ground operation、Remote control、Cab operation.