The QE250+250t double-girder crane is a heavy-duty lifting equipment with standard spans ranging from 6 to 18 meters. It offers commonly used specifications of 6m, 9m, 12m, 18m, 24m, and 30m, while also supporting custom non-standard designs to meet various operational requirements. The equipment operates reliably in temperature conditions from -25°C to +40°C, with relative humidity not exceeding 85%, and is suitable for areas with altitudes up to 2,000 meters. It supports three-phase AC power supply at 50Hz, compatible with multiple voltages including 380V, 460V, or 600V, and is designed for safe and efficient operation in indoor environments or sheltered outdoor locations with wind speeds not exceeding Level 6.
As an ideal solution for heavy industries, the QE250+250t double-girder crane is widely used in steel, port, and heavy machinery manufacturing sectors due to its high load capacity and stable performance. Its robust double-girder structure ensures long-term deformation-free operation while allowing customized adjustments to suit specific working environments. Whether in standard workshops or special conditions, this crane delivers reliable lifting solutions to enhance production efficiency for enterprises.
In industries such as shipbuilding, aerospace, and heavy machinery manufacturing, large components often require lifting and transportation. For example, in shipbuilding, dual-trolley coordinated operations can precisely lift and position large structural parts like hull plates and keels for assembly. In the aerospace sector, the crane can handle aircraft fuselage components, utilizing dual-trolley coordination for more flexible and precise lifting operations, thereby enhancing manufacturing efficiency and accuracy.
Widely used in steel plants for raw material handling, molten ladle transfer, and finished product loading/unloading. For instance, it can transport molten steel ladles from the furnace to casting stations or move rolled steel products to storage warehouses. The dual-trolley system allows independent operations—one trolley handling the ladle while the other manages auxiliary equipment or materials—improving production coordination and efficiency.
Essential for lifting large equipment like generator stators, rotors in thermal or hydropower plants, and transformers during substation construction. The dual-trolley design enables flexible lifting configurations based on equipment weight and dimensions, ensuring smooth execution of power infrastructure projects.
Used for loading/unloading containers and heavy machinery at ports. Dual trolleys can operate simultaneously—either handling separate cargo tasks or collaborating to lift oversized/overweight items—boosting port throughput and vessel turnaround speed.
Applied in mining operations to transport ores and slag. Examples include hoisting extracted ores from underground to surface or transferring materials between processing stages in beneficiation plants. The dual-trolley system optimizes task allocation based on material flow and lifting distances, enhancing operational efficiency.
Featuring a dual-trolley design with independent hoisting mechanisms for each trolley, enabling individual or synchronized operation. This allows handling heavier loads, with typical rated capacities ranging from 5 to 320 tons, meeting diverse heavy-duty lifting requirements for large equipment and materials.
Dual trolleys can perform simultaneous tasks or collaborate for oversized loads, significantly improving efficiency compared to single-trolley cranes. For instance, in heavy equipment workshops, one trolley can position components while the other transports tools/auxiliary materials, enabling parallel operations to shorten production cycles.
Equipped with advanced positioning systems and fine-tuned speed control, achieving millimeter-level accuracy in trolley and hoist movement. Ideal for precision-critical applications like delicate instrument manufacturing or electronics production.
Trolleys operate independently or synchronously via coordinated controls. Operators can adjust lifting heights and speeds asymmetrically to balance irregularly shaped or off-center loads.
Multiple safeguards including: Load limiters, Hoist height limiters, Travel end stops, Buffers, Anti-wind devices, Effectively prevents overloads, over-travel, collisions, and ensures secure operations.
1. Industry Position
Founded in 2006, Dafang Heavy Machinery covers an area of 1,580 acres and employs over 2,600 people. With an annual sales revenue of 3.566 billion RMB, the company focuses on two main business sectors: lifting machinery and steel structures. Major products include single and double girder bridge and gantry cranes, electric hoists, steel structure bridges, prefabricated buildings, and industrial plants. Dafang serves critical sectors such as military industry, aerospace, nuclear power, offshore engineering, metallurgy, and mining. Its products are exported to over 100 countries and regions, including the United States, Russia, and Southeast Asia.
Annually, Dafang manufactures 30,000 single-girder cranes, more than 12,000 double-girder and gantry cranes, and 30,000 electric hoists. Based on production scale, sales volume, and brand recognition, the company ranks among the top three in China’s crane industry.
2. Core Technologies
Dafang’s R&D team consists of over 260 members, including 104 with senior or intermediate engineering qualifications. The company invests 3.8% of its annual sales into technology development. It has obtained 12 international invention patents, 50 national invention patents, 415 utility model patents, and achieved 43 scientific and technological milestones. Dafang was the first in the industry to adopt anti-sway and automatic positioning technologies.
In 2016, Dafang became the first enterprise in Henan Province to implement smart crane applications and to introduce remote monitoring technology. The company also developed the multifunctional brewing crane, filling a domestic market gap. In 2021, Dafang was the first in the industry to be certified for unmanned intelligent cranes. In 2022, it undertook a project for a tower crane at a commercial satellite launch site.
3. Manufacturing Capability
Dafang Heavy Machinery is equipped with advanced in-house designed manufacturing equipment, including 1,500-ton press grooving machines, extrusion machines, and roller machines. The company has established leading domestic workshops, including an electrical assembly line, steel pre-processing line, paint finishing line, and China’s first practical single-girder lean production line. Precision machinery includes imported German NILES CNC gear grinding machines and Japanese MAZAK machining centers.
Dafang strictly follows refined manufacturing processes, adhering to the principle of “doing it right the first time, zero defects.” This commitment to quality is deeply ingrained in every employee, ensuring that every product delivered meets the highest standards.
4. Service Assurance
Dafang upholds a “comprehensive, high-quality” service standard, providing users with fast, attentive, and thorough one-stop services. With 24/7 online support, choosing Dafang means complete peace of mind. Just tell us what you need—we’ll take care of the rest.
Laser ranging + closed-loop VFD control maintains <3mm deviation
Triple safeguards: Backup power (30min) + mechanical lock + dual brakes
