Models and Specifications of Double-Girder Overhead Cranes

The main models of double-girder overhead cranes include QD, LH, QE, QZ, QC, QA, QN, QP, QS, XQD, etc. Their specifications are mainly determined by four key parameters: lifting capacity, span, lifting height, and duty class.

Model Designation and Naming Rules

The model is generally composed of a type code + main parameters (lifting capacity / span) + duty class.

• Q: Overhead Crane

• D: Hook type, single trolley

• H: Electric hoist

• E: Double trolley

• Z: Grab bucket

• C: Electromagnetic chuck

• A: Electromagnetic + hook

• N: Grab bucket + hook

• P: Grab bucket + electromagnetic

• S: Three functions (hook + grab + electromagnetic)

• X: European-style / new design

Example: QD 32/5 – 25.5 A5

• QD: Hook-type double-girder overhead crane

• 32/5: Main hook 32t, auxiliary hook 5t

• 25.5: Span 25.5m

• A5: Duty class A5

Main Models and Applications

QD Type (General Hook Double-Girder Crane)

• Lifting capacity: 5t to 500t

• Span: 10.5m to 31.5m (customizable)

• Lifting height: 6m to 22m (customizable)

• Duty class: A3–A7

• Application: General lifting in machining, assembly, metallurgy, warehouses, ports, etc.

LH Type (Electric Hoist Double-Girder Crane)

• Lifting capacity: 1t to 32t

• Light to medium duty

• Suitable for light workshops and small-load handling

QE Type (Double-Trolley Double-Girder Crane)

• Equipped with two trolleys for synchronous lifting

• Ideal for long and heavy workpieces such as steel beams and large equipment

QZ Type (Grab Bucket Double-Girder Crane)

• Used for bulk materials such as coal, ore, sand, and grain

QC Type (Electromagnetic Double-Girder Crane)

• Used for lifting steel plates, scrap iron, and other ferrous materials

QA / QN / QP / QS (Multi-Function Cranes)

• Combined functions: hook, grab bucket, electromagnetic chuck

• Suitable for mixed material handling in complex working conditions

XQD Type (European-Style Double-Girder Crane)

• Light weight, low headroom, low wheel load

• High efficiency, energy-saving, stable performance

• Widely used in modern workshops and high-standard industrial sites

Key Selection Parameters

• Lifting capacity: Maximum weight to be lifted

• Span: Distance between the center lines of the two main beams

• Lifting height: Vertical distance from the hook’s lowest point to the ground

• Duty class: A3 (light), A4–A5 (medium), A6–A7 (heavy)

• Operation modes: cabin control, pendant control, wireless remote control