OVERHEAD CRANE

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Single Girder Hoist Overhead Crane

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QD Double Girder Overhead Crane

QB Type Explosion-proof hook Bridge Crane

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This crane is mainly used in chemical plants, oil refineries, paint workshops, gas production facilities, fireworks manufacturing, and other hazardous environments with explosive gases or dust.

Capacity:

1 t – 50 t (customizable)

Lifting Height:

6 m – 20 m (customizable based on building clearance)

Span:

7.5 m – 28.5 m customizable

Voltage/Hertz:

3 Phase 380V 50hz

Working Class:

A4, A5, A6

Explosion-proof Level:

Ex d IIB T4 / Ex d IIC T4 / Ex tD A21 IP65 T135°C (customizable based on hazardous zone classification)

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Introduction

Application Scenario

Advantages

Structural Diagram And Parameter Table

INTRODUCTION

The QB Type Explosion-Proof Overhead Crane is a heavy-duty, double-girder bridge crane specifically engineered for hazardous environments containing flammable gases, vapors, or combustible dusts. All electrical components, motors, wiring, and mechanical parts are designed with flameproof enclosures, anti-static materials, and spark-resistant configurations to prevent thermal or electrical ignition sources.

APPLICATION SCENARIO

1. Oil & Gas Industry
Used in refineries for lifting crude oil storage tanks and refining equipment, and in natural gas stations and filling stations for pressure vessel and pipeline installation work

2. Chemical Production
Handles containers and equipment containing flammable gases and chemicals in chemical production workshops, where preventing fire and explosion is critical-

3. Pharmaceutical Manufacturing
Transports raw materials and products in cleanrooms where dust or organic solvents are present, ensuring strict contamination and accident prevention

ADVANTAGES

1. Comprehensive Explosion-proof Design
All critical components — including motors, hoisting mechanisms, electrical control boxes, brakes, cables, switches, and lighting systems — are designed with explosion-proof enclosures. The flameproof casings have sufficient strength and tightness to isolate internal sparks and arcs from external explosive gases or dust

2. Certified Safety Compliance
Complies with GB3836.2-2000 for explosion-protected electrical equipment and JB/T5897-2006 for explosion-proof bridge cranes, and holds Explosion-proof Certification from designated national inspection bodies

3. Robust Structural Integrity
The double-girder main beam and end beam are welded from high-quality steel using automatic submerged arc welding, ensuring high-quality weld seams and structural stability. Non-metallic components are made of anti-static materials to prevent static electricity hazards

STRUCTURAL DIAGRAM AND PARAMETER TABLE

Parameter	Specification
Working Class	A4, A5, A6
Capacity	1 t – 50 t
Span	7.5 m – 28.5 m
Lifting Height	6 m – 20 m
Lifting Speed	Main hook: 4 – 10 m/min Auxiliary hook: 6 – 12 m/min
Trolley Travelling Speed	35 – 45 m/min
Crane Travelling Speed	20 – 50 m/min
Explosion-proof Level	Ex d IIB T4 / Ex d IIC T4 / Ex tD A21 (customizable)
Temperature Class	T1 – T6 (customizable)
Control Method	Explosion-proof pendant / Explosion-proof remote radio / Cabin with purge system
Power Supply	380V / 50Hz / 3-phase
Temperature (Ambient)	-20°C to +50°C
Protection Grade	Motors: IP54 – IP65, Explosion-proof enclosure. Electricals: IP65 sealed
Suitable Zones	Gas: Zone 1, Zone 2 / Dust: Zone 21, Zone 22
Girder Type	Double girder – box-section with non-sparking coating options

NUCOLLEN CERTIFICATE

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