A buried scraper conveyor is a continuous conveying system that uses a scraper chain to move bulk materials through an enclosed trough. It is commonly used to transport powdery, granular, and small lump materials. Compared with open conveying systems, its enclosed trough helps reduce material spillage and dust dispersion. Depending on the plant layout, the conveyor can also be designed with multiple feed and discharge points to meet different material handling requirements.
Operating principle of a buried scraper conveyor
A buried scraper conveyor uses a drive unit to move the scraper chain in a continuous loop. During conveying, the scrapers remain embedded in the material bed. Their pushing action, together with the internal friction between the material particles, moves the bulk material along the trough toward the discharge end. The specific conveying method depends on the equipment design and installation configuration.
Depending on the conveying route and structural design, buried scraper conveyors can be arranged for horizontal, inclined, or vertical conveying. Some models can also use a combination of conveying directions. When selecting equipment, consider the material's particle size, flow characteristics, moisture content, and conveying distance. The conveying direction alone is not enough to determine whether a particular conveyor is suitable for the application.
Main components and features
Main components
A buried scraper conveyor typically consists of an enclosed trough, a scraper chain, a drive unit, and a tensioning device. Some models also include relevant safety protection devices.
The enclosed trough contains the material and forms the conveying channel. The scraper chain moves the material and is the main working component. The drive unit supplies the power required to move the chain, while the tensioning device adjusts and maintains chain tension. The condition and fit of these components affect operating performance and maintenance requirements.
Conveying and layout features
Buried scraper conveyors have a relatively compact structure, and their enclosed trough helps control material spillage. Depending on the model and process layout, the equipment can be designed with multiple feed or discharge points to meet different material transfer requirements.
Actual conveying capacity, operating noise, and maintenance workload depend on factors such as equipment specifications, material properties, and the condition of the chain and scrapers. Equipment selection should therefore be based on the specific operating conditions and technical requirements rather than assuming that all models have the same performance characteristics.
Sealing performance and operating safety
The enclosed structure helps limit dust dispersion and can improve cleanliness in the surrounding work area. Actual sealing performance, however, depends on the design and maintenance of the trough, joints, feed openings, and discharge openings.
For flammable, explosive, or otherwise hazardous materials, an enclosed conveying structure alone does not establish that the equipment has explosion protection. Before use, confirm its suitability based on the material properties, site-specific risks, and applicable equipment protection requirements.
Applications of buried scraper conveyors
Buried scraper conveyors are used in industries such as grain processing, feed production, coal handling, building materials, metallurgy, electric power, and chemicals. They mainly transport powdery, granular, and small lump materials. Differences in particle size, density, moisture content, and flow characteristics can affect conveying performance and equipment selection.
For applications in food processing and pharmaceutical production, users should also verify the materials used in product-contact areas, cleaning requirements, and whether the equipment structure meets the specific process requirements. For materials with special handling requirements, check the equipment's wear resistance, corrosion resistance, and temperature limits to avoid maintenance problems caused by unsuitable operating conditions.
Routine maintenance of buried scraper conveyors
Inspect the scraper chain and operating condition
Inspect the scraper chain, scrapers, and connecting components at regular intervals. Check for wear, loose connections, and deformation. If the conveyor develops unusual noise or vibration, or its conveying capacity changes, investigate the cause promptly. Check the chain tension and inspect the relevant components for abnormalities.
Check the drive and tensioning devices
Regularly check the drive unit and tensioning device. Inspect components that require lubrication according to the equipment manufacturer's instructions. Use the specified lubricant and follow the recommended lubrication method and maintenance intervals rather than making changes without reference to the equipment requirements.
Remove accumulated material and inspect seals
Remove material accumulated inside the trough according to the material characteristics and operating conditions. Inspect the feed and discharge openings and connecting sections for blockages, material leakage, or sealing problems.
Before cleaning or maintenance, stop the equipment and follow the site's safety procedures, including the necessary energy isolation measures, to prevent unexpected startup.
Address wear and faults promptly
When the scrapers, chain, or other components are damaged, assess whether repair or replacement is necessary. Before replacing a component, verify its dimensions, connection method, and assembly requirements to ensure compatibility with the existing structure. Have qualified maintenance personnel inspect faults that cannot be identified or resolved internally.
Routine maintenance affects both conveying performance and the service life of wear components. Regular inspections, cleaning, and timely component replacement help reduce downtime caused by equipment faults.
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