Large-scale Steel Structure Shot Blasting Machine

The large-scale steel structure shot blasting machine produced by China supplier Qingdao KEEJOO Group is a continuous pass-through surface treatment equipment, mainly used for rust removal, descaling, and pretreatment of large workpieces such as metal plates, profiles, and steel structural components. This series of equipment uses an electrically controlled, variable-speed conveyor roller system to transport workpieces into the shot blasting chamber, where they are subjected to intense shot blasting and friction from different directions. This effectively removes surface contaminants and achieves a smooth surface with a specific roughness, preparing the workpieces for subsequent painting, welding, or electroplating processes.

KEEJOO brand large-scale steel structure shot blasting machines integrate high efficiency, superior quality, advanced technology, automation, environmental protection, and high reliability. They are the ideal choice for medium and large-sized manufacturing enterprises seeking long-term stable equipment operation, process consistency, and reduced total life cycle costs.

Working principle

After the workpiece is transported into the shot blasting chamber via a roller conveyor for cleaning, the mixture of shot and rust particles is recovered to the elevator through a blowing device and a screw conveyor system.  After purification by the upper separator, the clean shot is recycled, while the dust is processed and discharged by the dust removal system. This equipment enables automated continuous operation, significantly reducing manual handling and helping to achieve surface preparation grades (such as Sa 2.5 or Sa 3) according to ISO 8501-1 standards.

KEEJOO brand steel structure shot blasting machines can be used independently or integrated as a core component into fully automated production lines that include preheating, shot blasting, painting, and drying. The company has the capability to provide customized solutions, designing systems based on workpiece specifications (such as widths up to 6000 mm) and process requirements (throughput speeds ranging from 1.0 to 8.0 meters per minute) to optimize processing quality and cost.

Technical parameter

Core advantages

High-efficiency continuous operation

The equipment utilizes a roller conveyor system, allowing workpieces to pass continuously through the shot blasting chamber automatically without requiring downtime for loading and unloading, significantly improving production efficiency. A single machine can process several tons or even tens of tons per hour, which is 5-10 times more efficient than manual processing, making it particularly suitable for assembly line operations involving standardized workpieces such as automotive chassis and steel structural frames.

Uniform and stable processing results

By using high-speed rotating shot blasters to propel steel shot at speeds of 80-100 m/s from multiple angles, complete and thorough cleaning without blind spots can be achieved. The treated workpiece surface exhibits high cleanliness, with a rust removal grade of Sa2.5 or higher, and a surface roughness controllable between Ra30-75 μm, fully meeting the pretreatment requirements for subsequent processes such as painting and welding.

 Highly automated and intelligent

The equipment is typically equipped with a PLC control system, which allows for automatic adjustment of parameters such as shot blasting time, conveying speed, and shot material circulation.  One person can operate multiple machines, reducing labor costs and ensuring consistent processing quality.

Excellent environmental protection and energy-saving performance

The equipment features a closed design and is equipped with a high-efficiency dust removal system, ensuring that dust emissions meet environmental requirements and maintaining a clean working environment. The design also incorporates pellet recycling, reducing resource waste.

Strong adaptability and reliability.

Qingdao KEEJOO Group’s large-scale steel structure shot blasting machine can adjust the roller spacing or shot blaster angle according to the workpiece size, offering strong adaptability. They have extensive experience in the processing of heavy workpieces, having designed and manufactured over 900 large-scale steel profile shot blasting machines, demonstrating the exceptional reliability of their products in the steel construction and steel structure industries.

Application areas

Steel Construction and Steel Structure Engineering: Qingdao KEEJOO Group has established strategic partnerships with leading companies such as Hangxiao Group and jointly developed specialized equipment.  Their shot blasting machines are widely used for surface cleaning and pretreatment of large steel structural components such as H-beams, steel plates, and bridge components, meeting the demands of high-strength, large-volume production.

Heavy machinery and construction equipment:  Our equipment serves globally renowned construction machinery manufacturers such as Sany Heavy Industry and Caterpillar, and is used for processing large castings, welded parts, and structural components, improving the surface quality and fatigue strength of these parts.

Automotive and Shipbuilding: We provide shot blasting and surface strengthening solutions for companies such as FAW-Volkswagen, Bombardier, and Alstom, applied to the rust removal, descaling, and surface strengthening of automotive chassis, body parts, and ship steel plates and hull structures.

Nuclear Power and High-End Equipment Manufacturing:  The successful development of the first domestically produced HSK-50 hook-type shot blasting machine for nuclear power valves represents a technological breakthrough in the cleaning of high-end, precision components such as nuclear power valves, demonstrating its adaptability in cutting-edge manufacturing applications.

Rail Transit: Serving companies such as CRRC, providing surface treatment solutions for large metal components used in high-speed rail, subway, and other rail transit equipment.

FAQ

1.What are steel structure shot blasting machines primarily used for?

This equipment is specifically designed for cleaning large steel structures, such as H-beams, steel columns, and box girders, and is suitable for mass processing in industries such as factories, bridges, and wind turbine towers.

2. What are the differences between a large-scale steel structure shot blasting machine and common shot blasting machine?

Large-scale steel structure shot blasting machines have a high load capacity and spacious working area, allowing them to handle large-sized steel structures. They offer higher blasting power, provide comprehensive cleaning, and can be integrated into production lines for continuous operation.

3. What results can be expected after cleaning?

Thoroughly removing rust, mill scale, and welding slag results in a uniformly rough surface, allowing paint to adhere more firmly and making the steel more resistant to fatigue and less prone to rusting.

4. What is the maximum size and weight of steel structures that can be handled?

Standard widths are ≤ 5 meters, heights are ≤ 5 meters, and lengths are unlimited.  Each meter can bear a load of 5-50 tons, and all specifications can be customized according to requirements.

5. What are the core components of the large-scale steel structure shot blasting machine?

The heavy-duty conveyor rollers, high-power shot blasters, shot separators, bag filters, and enclosed cleaning chamber all feature wear-resistant materials for their easily damaged parts.

6. Are the cleaning speed and effectiveness satisfactory?

The speed is adjustable from 0.5 to 5 meters per minute, and the cleaning level can reach the highest national standard of Sa2-2.5. The surface roughness meets the requirements for painting. Dangerous areas are equipped with guardrails and emergency stop buttons, and there are jamming/overload alarms. The circuit has leakage protection, and the machine will automatically shut down in case of malfunction.