QB Explosion-Proof Double Girder Overhead Crane
Authentication mark:
Capacity:
5 – 75 ton (customisable up to 200 ton)
Lifting Height:
6 – 30 m (customisable)
Span:
10.5 – 31.5 m
Voltage/Hertz:
3-Phase AC, 380V / 400V / 415V / 460V, 50Hz / 60Hz
Working Class:
A5 (Intermediate duty, ground or cab control)
Apply : Oil and gas refineries and processing facilities
Petrochemical and coal chemical plants
Pharmaceutical production facilities with flammable solvents
Hydrogen production and storage facilities
Paint and coating manufacturing workshops
Get A Free Quote
Introduction
Technical Data
Application
Certificate
PRODUCT INTRODUCTION
The QB Explosion-Proof Double Girder Overhead Crane is a purpose-built lifting solution for workshops and industrial facilities where flammable gases, vapours, or explosive atmospheres are present. All motors and electrical components comply with GB3836.2-2000, the Chinese national standard for flameproof electrical apparatus in explosive gas atmospheres, and the complete machine is certified to JB/T5897-2006 for explosion-proof bridge cranes. The crane carries explosion-proof grades ExdIIBT4 and ExdIICT4, covering hazardous Zone 1 and Zone 2 environments.
The flameproof enclosure design means that any internal electrical spark or arc is fully contained within a sealed, pressure-resistant housing — preventing ignition of surrounding explosive atmospheres. For ExdIICT4 applications, the crane's wheel treads and flanges are manufactured from copper alloy or equivalent non-sparking materials to eliminate any risk of friction-induced ignition during travel.
The double-girder box section structure spans from 10.5 to 31.5 metres and handles lifting capacities from 5 to 75 tonnes in standard configurations, with heavier capacities available on request. The crane is suited to continuous and high-intensity operation — a key distinction from lighter-duty explosion-proof crane types. Standard control is by ground pendant; cab control can be specified where the operating environment permits.
Unlike standard overhead cranes, the QB is not rated for remote radio control in its standard configuration. All electrical components — motors, brake systems, control panels, and junction boxes — are sealed to explosion-proof specifications throughout, with no standard industrial components substituted.
TECHNICAL DATA
| Parameter | Specification | Parameter | Specification |
| Parameter | Specification | Model | QB |
| Lifting Capacity | 5 – 75 ton (customisable up to 200 ton) | Span | 10.5 – 31.5 m |
| Lifting Height | 6 – 30 m (customisable) | Working Duty | A5 (Intermediate duty, ground or cab control) |
| Explosion-Proof Grade | ExdIIBT4 / ExdIICT4 | Applicable Hazardous Zone | Zone 1 / Zone 2 (per GB3836.1-2000) |
| Gas Group | IIB / IIC | Temperature Class | T4 (max surface temperature ≤ 135°C) |
| Compliance Standards | GB3836.2-2000, JB/T5897-2006 | Lifting Speed | Variable (frequency inverter control available) |
| Trolley Travelling Speed | ≤ 16 m/min (ExdIICT4 configuration) | Power Supply | 3-Phase AC, 380V / 400V / 415V / 460V, 50Hz / 60Hz |
| Control Method | Ground pendant control (standard) / Cab control (optional) | Working Temperature | -25°C to +40°C |
| Wheel / Flange Material (IIC) | Copper alloy or non-sparking materials | Motor Protection | IP54 / IP44, Class F or H insulation |
| Electrical Components | Siemens (Germany) |
APPLICATION
The QB Explosion-Proof Double Girder Overhead Crane is a purpose-built lifting solution for workshops and industrial facilities where flammable gases, vapours, or explosive atmospheres are present. All motors and electrical components comply with GB3836.2-2000, the Chinese national standard for flameproof electrical apparatus in explosive gas atmospheres, and the complete machine is certified to JB/T5897-2006 for explosion-proof bridge cranes. The crane carries explosion-proof grades ExdIIBT4 and ExdIICT4, covering hazardous Zone 1 and Zone 2 environments.
The flameproof enclosure design means that any internal electrical spark or arc is fully contained within a sealed, pressure-resistant housing — preventing ignition of surrounding explosive atmospheres. For ExdIICT4 applications, the crane's wheel treads and flanges are manufactured from copper alloy or equivalent non-sparking materials to eliminate any risk of friction-induced ignition during travel.
The double-girder box section structure spans from 10.5 to 31.5 metres and handles lifting capacities from 5 to 75 tonnes in standard configurations, with heavier capacities available on request. The crane is suited to continuous and high-intensity operation — a key distinction from lighter-duty explosion-proof crane types. Standard control is by ground pendant; cab control can be specified where the operating environment permits.
Unlike standard overhead cranes, the QB is not rated for remote radio control in its standard configuration. All electrical components — motors, brake systems, control panels, and junction boxes — are sealed to explosion-proof specifications throughout, with no standard industrial components substituted.
