Dongqi Crane specializes in manufacturing the QZ series double girder grab bucket overhead crane, a heavy-duty material handling solution engineered for efficient bulk material processing. This advanced crane system represents a significant improvement in industrial handling equipment for various sectors including waste management, ports, and steel production.

Product Overview: Advanced Engineering for Heavy-Duty Applications

The QZ series double girder grab bucket overhead crane is a specialized bridge crane designed for handling bulk materials with precision and efficiency. With a lifting capacity ranging from 5 to 30 tons and spans extending from 10.5 to 34.5 meters, this crane system meets diverse industrial requirements . The A5-A7 working classification confirms its suitability for heavy-duty operations requiring continuous, high-intensity performance .

The crane operates within a temperature range of -20°C to 60°C , demonstrating its adaptability to various environmental conditions. Its robust double girder design ensures stability and reliability when handling challenging materials, from scrap metal to bulk grains.

Key Features and Technical Specifications

Structural Advantages

• Dual girder configuration provides enhanced stability and load-bearing capacity
• High-strength structural components ensure long-term reliability in demanding environments
• Box-shaped crane bridge offers optimal support for heavy loads and continuous operation
• Multiple wheel configurations (typically 4 wheels) distribute load evenly for smooth movement

Performance Specifications

The QZ grab overhead crane delivers exceptional performance across key metrics:

Capacity	Lifting Speed	Trolley Speed	Crane Speed
5 ton	39.2 m/min	44.6 m/min	93.6 m/min
10 ton	39.3 m/min	45.9 m/min	112.5 m/min
16 ton	41.8 m/min	43.2 m/min	98 m/min
20 ton	45.7 m/min	43.2 m/min	87.3 m/min

Control and Safety Systems

• PLC-based control system enables high automation levels and precise operation
• Multiple control methods including cabin control and wireless remote control options
• Comprehensive safety features including overload protection, limit switches, emergency stop devices, and warning indicators
• Laser-assisted height measurement for precise positioning and operation
• Double-speed mechanism for enhanced precision in material handling tasks

Industrial Applications and Sector-Specific Benefits

Waste Management and Recycling

In waste handling facilities, the QZ grab crane demonstrates exceptional capability in processing municipal solid waste, industrial waste, and construction debris. The crane’s orange peel grab buckets efficiently handle irregularly shaped materials common in recycling operations . With its A6-A7 duty classification, the crane withstands the demanding conditions of waste processing environments, including exposure to corrosive elements and high dust levels .

Port and Terminal Operations

For bulk material handling at ports, the QZ crane offers efficient loading and unloading of vessels carrying commodities such as coal, iron ore, grains, and fertilizers. The high lifting capacity combined with rapid cycling capabilities significantly reduces vessel turnaround times . The crane’s corrosion-resistant components provide enhanced durability in marine environments.

Steel and Metal Production

In steel plants and foundries, the grab crane handles raw materials including iron ore, coke, and scrap metal with precision and efficiency. The heavy-duty structural design withstands the high-temperature conditions often present in metallurgical operations . Specialized scrap handling grabs enable efficient processing of recycled metal materials .

Power Generation

Thermal power plants benefit from the crane’s ability to handle bulk fuels like coal and ash byproducts. The automated grab operation allows for continuous feeding of boiler systems and efficient removal of combustion residues . The precision control systems enable accurate fuel measurement and placement.

Building Materials and Construction

For cement plants and building material facilities, the QZ crane efficiently handles raw materials including limestone, gypsum, and cement clinker. The dust-resistant electrical components ensure reliable operation in challenging conditions . The high lifting heights (up to 31 meters) facilitate stockpiling operations in large storage facilities .

Dongqi Crane’s International Project Success

Singapore: Port and Industrial Applications

Dongqi Crane has supplied multiple double girder overhead cranes to Singapore for various industrial applications. These installations include 20-ton double girder overhead cranes implemented for industrial operations requiring robust material handling solutions . The cranes were customized to address Singapore’s space constraints and high operational efficiency requirements.

United Arab Emirates: Shipyard and Industrial Lifting

In the UAE, Dongqi provided 4 sets of 2-ton pillar mounted jib cranes for ship maintenance applications at UAE Shipyard Services LLC . These installations demonstrate Dongqi’s capability to tailor lifting solutions to specific industrial requirements in challenging environments.

Australia: Manufacturing Sector

Australian manufacturing company, Aussie Manufacturing Solutions Pty Ltd., implemented a 25-ton double girder overhead crane from Dongqi Crane for their manufacturing operations . The crane’s reliable performance in demanding production environments has strengthened Dongqi’s reputation in the Australian industrial sector.

Pakistan: Steel Industry Applications

For Steel Dynamics Pakistan Ltd., Dongqi supplied a 35/5 ton double girder hoist with end carriages specifically designed for steel plant operations . This installation highlights Dongqi’s expertise in creating industry-specific solutions for demanding metallurgical applications.

Vietnam and Broader Regional Implementation

Vietnamese manufacturing facilities have successfully implemented Dongqi’s portable gantry cranes , demonstrating the versatility of Dongqi’s product range in addressing diverse material handling needs across different industries and facility layouts.

Technical Superiority and Competitive Advantages

Customization Capabilities

Dongqi’s QZ grab cranes offer extensive customization options to meet specific operational requirements:

• Lifting capacity customization from 5 tons to 100 tons based on application needs
• Span adjustments according to facility layout and coverage requirements
• Specialized grab buckets including clamshell, orange peel, and electromagnetic variants
• Control system options ranging from traditional cabin operation to advanced remote control and fully automated systems

Durability and Reliability Features

• Heavy-duty structural design withstands continuous high-intensity operation
• Premium-grade components including motors, bearings, and gears ensure extended service life
• Advanced protection systems including IP54 rating for dust and moisture resistance
• Corrosion-resistant treatments on critical components for extended lifespan in challenging environments

Operational Efficiency Enhancements

• Rapid cycling capabilities for increased material handling throughput
• Precision positioning systems enabling accurate material placement
• Smooth acceleration and deceleration through frequency conversion speed control
• Automated operation options for reduced labor requirements and improved consistency

Conclusion: Trusted Heavy-Duty Material Handling Solution

The QZ series double girder grab bucket overhead crane represents a pinnacle of industrial material handling technology, combining robust construction with advanced control systems for superior performance in demanding applications. Dongqi Crane has demonstrated its expertise through successful implementations across multiple continents and industries, earning the trust of international clients through reliable performance and comprehensive support.

With its proven track record in waste management, port operations, steel production, and power generation facilities, the QZ crane series stands as a premier solution for bulk material handling challenges. The A5-A7 duty rating confirms its capability for the most intensive operational environments, while customizable configurations ensure optimal performance for specific application requirements.

For industries seeking to enhance their bulk material handling efficiency with reliable, high-performance crane systems, Dongqi’s QZ series grab bucket overhead cranes offer a technologically advanced solution backed by international project experience and commitment to customer satisfaction.