The QD type double-girder overhead crane is a best-selling lifting equipment in many industries. It is mainly used for lifting heavy workpieces and goods in factories or warehouses. This overhead crane is known for its sturdy structure, strong lifting capacity and good operating performance.
It consists of two parallel main girders, which are the key components supporting the entire crane structure. These two main girders are made of high-strength steel. Compared with single girders, the double-girder design has better stability and load-bearing capacity, making it suitable for carrying larger loads.
The two main girders are connected to end trucks at both ends, which can move along the rails installed on the building.
The electric trolley moves laterally on the main girders, while the entire overhead crane moves longitudinally along the rails. Therefore, it can cover a large working area.
The double-girder crane features strong load-bearing capacity and high flexibility, making it suitable for handling large or heavy objects such as large mechanical parts and steel materials. It is widely used equipment in many industries.
Supports greater lifting weights, suitable for hoisting heavy equipment and materials.
The double-girder structure provides exceptional stability and wind resistance, ensuring safety.
Capable of flexible movement over large spans, improving lifting efficiency.
Equipped with advanced control systems to simplify operation procedures and reduce training requirements.
Features multiple safety mechanisms such as limit switches and emergency stop buttons to ensure personnel safety.
We also offer customized cranes with different lifting capacities. Feel free to contact us for more information!
| Product Name | Double Beam Bridge Crane | |||
| Type | QD Type | |||
| Capacity(t) | 5 | 50 | 200 | 450 |
| Lifting Height(m) | 16 | 5.9 | 20 | 24 |
| Span(m) | 10.5~31.5 | 13~31 | ||
| Work class | A5~A6 | |||
| Warranty | 1 years | |||
| Power Source | 3-Phase 50Hz 380V | |||
| Operational Method | Ground controlling; Remote controlling; Cabin Control | |||
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.
40% higher capacity, girder deflection ≤L/800
Pre-cambering technology compensates self-weight deflection
-25℃~+60℃ models available, IP54 rating
