In industries such as steel structure fabrication, bridge manufacturing, and shipbuilding, surface cleaning of steel plates and structural steel is an essential step prior to coating. Efficiently and uniformly removing mill scale and rust from steel surfaces is a key concern for many production managers. Puhua Heavy Industry’s roller conveyor shot blasting machine is designed to meet this need; this article introduces the equipment by covering its working principle, applicable workpieces, technical features, and key selection criteria.
## I. Working Principle
The roller conveyor shot blasting machine utilizes a continuous pass-through operation. Workpieces are carried by a roller conveyor system and enter the blast chamber at a constant, preset speed. Multiple blast wheels are arranged within the chamber, positioned above and to the sides of the workpieces. Abrasive media is projected at high speed onto the workpiece surfaces, using impact force to remove mill scale, rust, and welding slag. Workpieces are continuously blasted as they move through the machine, emerging fully cleaned. The cleaned workpieces are then discharged via the exit roller conveyor, ready for immediate coating or the next stage of production.
This continuous pass-through design allows the equipment to be directly integrated with other processes to form an automated production line, thereby reducing workpiece handling and waiting times.
## II. Applicable Workpieces
Puhua Heavy Industry’s roller conveyor shot blasting machines are primarily suitable for the following types of workpieces:
**Steel Plates**
Includes medium-to-heavy plates, thin sheets, checkered plates, bridge plates, vessel plates, etc. Workpiece width must fall within the dimensions of the blast chamber opening, while length is unlimited.
**Structural Steel Profiles**
Includes H-beams, I-beams, channel steel, angle steel, T-beams, etc. Although these workpieces have complex cross-sectional shapes, the roller conveyor system provides stable support, and multiple blast wheels projecting from various angles ensure coverage of all surfaces.
**Steel Pipes**
Includes round, square, rectangular, and spiral-welded pipes. Pipes are typically rotated while being conveyed on the rollers, ensuring uniform blast coverage across the outer surface. **Welded Structural Components**
Includes steel beams, steel columns, embedded parts, space frame members, etc. Such components often retain weld slag and mill scale after welding; shot blasting provides an ideal surface foundation for subsequent coating processes.
## III. Key Technical Features
**High Continuous Operation Efficiency**
The roller conveyor system allows workpieces to pass continuously through the blast chamber without stopping. The equipment can be directly integrated with other processes to form an automated production line, reducing workpiece transfer and waiting times.
**Uniform Cleaning Results**
Strategically arranged blast wheels ensure that all surfaces of the workpiece are treated as it moves through the system. Consistent cleaning results for various workpiece types can be achieved by adjusting the conveyor speed and shot flow rate.
**Wide Range of Applications**
Capable of processing workpieces of various specifications, including steel plates, H-beams, I-beams, channel steel, angle steel, steel pipes, and welded structural components. There is no limit on workpiece length, provided the width and height fit within the blast chamber's passage dimensions.
**Robust and Durable Structure**
The interior of the blast chamber is lined with highly wear-resistant protective plates, effectively extending the equipment's service life. The rollers are made from wear-resistant materials, capable of withstanding the continuous transport of heavy workpieces.
**Environmentally Friendly Design**
Equipped with a high-efficiency cartridge dust collection system to ensure dust emissions meet regulatory standards. The blast chamber is well-sealed to prevent dust leakage and improve the working environment.
The parameters above are for reference only; specific configurations are determined based on workpiece specifications and production requirements. ## V. Typical Application Industries
**Steel Structure Industry**
Surface pre-treatment of steel plates and profiles prior to welding and cutting; removes mill scale and rust, providing a solid foundation for subsequent coating.
**Bridge Manufacturing**
Batch cleaning of steel structural components for bridges; ensures coating adhesion and extends the anti-corrosion lifespan of the bridge.
**Shipbuilding and Repair**
Rust removal for marine-grade steel plates and profiles; meets the rigorous standards required for marine coating applications.
**Petrochemical Industry**
Surface cleaning of steel plates for pipelines and storage tanks; removes welding residues and prepares surfaces for anti-corrosion coatings.
**Steel Pre-treatment**
Batch rust-removal lines for steel processing centers; supplies pre-treated steel materials to downstream customers.
## VI. Selection Guidelines
When selecting a roller conveyor shot blasting machine, consider the following factors:
**Workpiece Cross-Section Dimensions**
Maximum width and height determine the dimensions of the shot blasting chamber opening. Ensure the workpiece's maximum dimensions fall within the equipment's allowable passage range.
**Workpiece Length**
There is no limit on length, but it affects the configuration of the infeed and outfeed roller conveyors; longer workpieces require longer conveyor lines.
**Processing Speed**
Required production capacity dictates conveyor speed and the power configuration of the blast wheels. Higher speeds increase capacity but reduce the available cleaning time.
**Cleaning Requirements**
Surface cleanliness grades and roughness profiles influence blast parameter settings. Achieving an Sa 2.5 grade typically requires a longer processing time or higher blast intensity compared to Sa 2.0.
**Site Conditions**
Confirm the total equipment length and pit requirements in advance. Roller conveyor shot blasting machines usually require a pit to accommodate the abrasive recovery system.
## VII. Service Advantages of Puhua Heavy Industry
**Free Solution Design**
Provides detailed equipment layout plans and technical specifications based on customer workpiece dimensions and production capacity requirements.
**Customization Capabilities**
Offers custom configurations for blast chamber dimensions, as well as the number and arrangement of blast wheels, tailored to specific workpiece sizes and cleaning requirements.
**Installation and Commissioning Services**
Provides on-site installation guidance, equipment commissioning, and operational training to ensure a smooth start-up and production launch. **After-Sales Support**
12-month warranty, lifetime technical support, and rapid spare parts supply.
## VIII. Conclusion
Puhua Heavy Industry’s roller conveyor shot blasting machine is suitable for the high-volume, continuous cleaning of long workpieces such as steel plates, structural steel sections, and steel pipes. Its core advantages include high processing efficiency, uniform cleaning results, and ease of integration into production lines, making it an ideal choice for surface treatment in industries such as steel structure fabrication, bridge manufacturing, and shipbuilding. Equipment specifications and configurations should be determined based on workpiece dimensions, production output requirements, and cleaning standards.
For more information on specific models or to receive selection recommendations, please provide details regarding workpiece specifications and production requirements so that our technical team can conduct a tailored assessment.
