Large Roller Conveyor Shot Blasting Machine For Steel Structure Cleaning

Large roller conveyor shot blasting machine for steel structure cleaning

Capabilities and Applications

The big roller conveyor shot blasting machine for steel structure is a heavy-duty, high-efficiency surface treatment equipment tailored for large, heavy steel structural components (e.g., H-beams, box beams, steel plates, and bridge segments). It integrates a reinforced roller conveyor system, high-power shot blasting turbines, and an intelligent media recycling system, enabling continuous, automated, and all-round surface cleaning and strengthening of large steel structures. This equipment is a core device in the steel structure manufacturing industry, directly determining the anti-corrosion quality and service life of steel structural products.

Models and Specification

I. Core Capabilities (Tailored for Large Steel Structures)

1. Heavy-Load Conveying with High Stability

Aimed at the characteristics of large steel structures (heavy weight, large size, long length), the machine is equipped with a reinforced roller conveyor system with the following capabilities:

• Ultra-high load-bearing capacity: Rollers are made of high-strength alloy steel, with a single roller load-bearing capacity of up to several tons. The entire conveyor line can stably transport super-heavy workpieces (e.g., 10–50t box beams for bridges, large steel plates with a thickness of over 100mm) without deformation or jamming.
• Precision conveying control: The conveyor speed is adjustable in a wide range (0.5–5m/min). For large workpieces requiring deep cleaning, the speed can be reduced to ensure sufficient shot blasting time; for batch lightweight steel structures, the speed can be increased to improve production efficiency.
• Anti-offset and anti-tilting design: Guide rails and side limit baffles are installed on both sides of the roller conveyor, which can effectively prevent large workpieces from shifting or tilting during conveying, ensuring uniform exposure to the shot blasting area.
• Compatibility with various steel structure shapes: The roller spacing can be customized according to the cross-section size of steel structures (H-beam, I-beam, box beam, etc.). It can adapt to workpieces with a width of 0.5–4m and a length of 5–30m, covering most large steel structure specifications in the construction and machinery industries.

2. All-Round, High-Intensity Shot Blasting Treatment

The machine is configured with multiple high-power shot blasting turbines (usually 6–12 sets, arranged in upper, lower, left, and right positions) to achieve the following shot blasting capabilities for large steel structures:

• Dead-angle-free surface coverage: The turbines are arranged in a three-dimensional layout, which can simultaneously blast the top, bottom, web, and flange surfaces of large steel structures. Even the welding seams and corner positions of box beams can be fully cleaned, solving the problem of incomplete cleaning of large workpieces in traditional equipment.
• Adjustable high shot blasting strength: The shot blasting turbine motor power is 15–37kW per set, and the shot blasting media flow rate can reach 80–200kg/min. It can quickly remove heavy oxide scale, rust, welding slag, and sand adhering to the surface of steel structures after rolling or welding, meeting the Sa2.5–Sa3 level cleaning standards specified in international steel structure surface treatment specifications.
• Surface strengthening function: In addition to cleaning, the high-speed impact of steel shots can form a dense compressive stress layer on the surface of steel structures, improving the fatigue strength and corrosion resistance of the workpiece. This is particularly important for steel structures used in high-load scenarios (e.g., bridge girders, crane beams).

3. Efficient Closed-Loop Media Recycling and Environmental Protection

For large-scale continuous production, the machine is equipped with a high-efficiency media recycling and dust removal system with the following capabilities:

• High-precision media separation: The mixture of steel shots, dust, and debris after shot blasting is transported to the separator through a screw conveyor and bucket elevator. The separator uses a combination of mechanical screening and air classification to separate reusable steel shots (with a separation accuracy of over 95%) from waste debris and dust, reducing media consumption costs.
• Low-emission dust removal: The supporting bag-type dust collector has a dust removal efficiency of over 99.5%, and the dust emission concentration is less than 30mg/m³, which meets the strict environmental protection requirements of the steel structure manufacturing industry. It avoids dust pollution in the workshop and protects the health of operators.
• Continuous operation without shutdown: The media recycling system can realize online supplement and replacement of steel shots, and the dust collector can be cleaned online, ensuring that the machine can run continuously for 24 hours without shutdown, which is suitable for large-scale steel structure production lines.

4. Intelligent Operation and Remote Monitoring

Most large roller conveyor shot blasting machines are equipped with an intelligent control system, with the following capabilities:

• Parameter visualization setting: Operators can set parameters such as conveying speed, shot blasting turbine start/stop sequence, and media flow rate through the touch screen, and the system will automatically adjust to ensure stable processing quality.
• Fault self-diagnosis: The system can monitor the running status of rollers, turbines, and dust collectors in real time. If faults such as roller jamming, turbine overload, or dust collector blockage occur, it will automatically alarm and display the fault location, reducing maintenance time.
• Connection with the production line: It can be seamlessly connected to the steel structure welding line, painting line, and other subsequent processes to form a fully automated production line, reducing manual handling and improving the overall production efficiency of the workshop.

II. Typical Applications in the Steel Structure Industry

1. Construction Steel Structure Industry

• Application scenarios: Surface cleaning and strengthening of large steel structural components for high-rise buildings, steel structure workshops, stadiums, and airport terminals (e.g., H-beam columns, box beam roof trusses, steel plate wall panels).
• Application effect: Remove the oxide scale and rust on the surface of steel structures to ensure the adhesion of subsequent anti-corrosion coatings; the surface strengthening function improves the wind and earthquake resistance of steel structures, extending the service life of buildings to over 50 years.

2. Bridge and Highway Engineering Industry

• Application scenarios: Surface treatment of bridge steel girders, steel box girders, guardrail steel structures, and tunnel support steel frames.
• Application effect: Clean the welding slag and rust on the surface of bridge steel structures, and form a compressive stress layer on the surface to resist the corrosion of rainwater, salt spray, and other harsh environments. It is a key process to ensure the service life of bridges (especially sea-crossing bridges and coastal bridges).

3. Heavy Machinery Manufacturing Industry

• Application scenarios: Surface cleaning of large crane beams, steel structure frames of construction machinery (e.g., excavator booms, crane main beams), and port machinery steel structures.
• Application effect: Remove the sand and oxide scale on the surface of cast steel and welded steel structures, improve the surface finish, and ensure the stability of subsequent painting and assembly, avoiding the problem of coating peeling caused by surface contaminants.

4. Shipbuilding and Offshore Engineering Industry

• Application scenarios: Surface treatment of ship hull steel plates, offshore platform steel structures, and port terminal wharf steel piles.
• Application effect: Achieve Sa3-level high-standard surface cleaning, which can effectively resist the corrosion of seawater and marine atmospheric environment, and is the premise of applying heavy anti-corrosion coatings for offshore steel structures.