The suspended slab-clamping overhead crane is a critical piece of equipment in the continuous casting and hot rolling areas of steel plants. It is specifically designed for the lifting, stacking, and flipping of high-temperature slabs. The overall structure adopts a heavy-duty box girder bridge design. The main beams and end beams are connected with high-strength bolts to form a rigid frame capable of withstanding high thermal radiation and heavy load impacts. The main girders typically feature a box-shaped structure with rails, reinforced with internal stiffeners to enhance torsional resistance.
Its core component is a special slab clamping device made of heat-resistant alloy steel. The clamps are embedded with special ceramic fiber linings to resist high-temperature scorching. Clamping is achieved through a lever mechanism or hydraulic system, and a mechanical self-locking design ensures clamping force is maintained even in the event of a power failure. The upper part of the clamp is connected to a lifting system composed of heat-resistant wire ropes and a balancing beam. In applications that require slab flipping, a rotating mechanism can be added to the clamp to achieve precise 90-degree or 180-degree rotations.
Considering the high-temperature operating environment, thermal insulation shields are installed on key electrical components. The main steel structure is coated with a heat-resistant and anti-corrosive coating, ensuring long-term reliable operation under temperatures ranging from 400°C to 1200°C. This sophisticated structural design makes the slab-clamping overhead crane an indispensable and essential piece of equipment on the continuous casting and hot rolling production lines of modern steel plants.
The overhead slab-clamping crane is a key material handling device in the steel and metallurgical industry, primarily used for transporting, stacking, and processing high-temperature slabs in core production stages. Its typical applications are concentrated in three critical areas of steel production:
The clamp-type crane is equipped with a gripping mechanism specifically designed for slabs, enabling secure and safe clamping and releasing of slabs of various sizes and weights. The clamps typically feature automatic adjustment capabilities to accommodate different material specifications.
Utilizing advanced electrical control systems and high-precision sensors, the crane ensures accurate positioning and stable operation throughout the lifting process. This is critical for preventing damage to the slabs during handling.
Engineered for handling large slabs weighing several tons, the crane offers sufficient strength and stability to ensure safe and efficient operation. The main beam and supporting legs are optimized to withstand heavy loads.
| Lifting Capacity | T | 35 | 50 | 65 | |
| Span | m | 27.5 | 37 | 35.5 | |
| Lifting Height | 12 | 12 | 12 | ||
| Working Grade | A7 | ||||
Speed | Hositing | m/min | 0.95~9.5 | 0.95~9.5 | 0.78~78 |
| Crab travelling | 3.8~38 | 3.8~38 | 3.8~38 | ||
| trolley travelling | 8.5~85 | 8~80 | 7.5~75 | ||
| Main dimensions | H | mm | 4450 | 4850 | 4650 |
| H1 | 2650 | 2800 | 2700 | ||
| H2 | 1200 | 1200 | 1200 | ||
| B | 10900 | 10900 | 11400 | ||
| K | 5000 | 5000 | 5500 | ||
| W | 6000 | 6000 | 6500 | ||
| B1 | 400 | 400 | 400 | ||
| B2 | 2450 | 2450 | 2450 | ||
| B3 | 2450 | 2450 | 2450 | ||
| Max.Wheel Load | kN | 382 | 494 | 473 | |
| Crane Rail Recommended | QU120 | ||||
| Power Supply | 3-Phase A.C.50Hz 380V | ||||
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.
The clamp features auto-adjustment, suitable for slabs of various thicknesses (e.g., 150–350mm) and widths (e.g.,800–2500mm).
No. The clamp uses a mechanical self-locking system that maintains grip even during power loss, ensuring safe lifting.
Yes. Optional rotation devices allow for precise 90° or 180° flipping, ideal for hot rolling furnace alignment.
The crane uses a track-box beam structure with reinforcement plates for torsional resistance; clamps are made of heat-resistant alloy steel with insulated protection at key points.
