Motion Control & Drives


Dust solutions for conveyor systems in bulk handling

August 2019 Motion Control & Drives

BLTWorld works closely with ScrapeTec, to offer advanced solutions for conveyor systems used in the handling of materials with excessive dust.

“AirScrape, TailScrape and DustScrape have been developed to provide dependable solutions for specific problems like dust, spills and contamination at the transfer points of conveyor systems,” says Ken Mouritzen, managing director, BLTWorld, distributors for ScrapeTec in Africa and the Indian Ocean Islands. “These highly-efficient systems prevent dust formation, reduce material spill, enable thorough belt-cleaning and minimise the risk of explosion at critical sections along the conveyor route and at transfer points.

“Although conventional dust prevention side-seals do reduce conveyor problems in the short-term, they quickly wear-out as a result of friction and can also damage the belt of the conveyor during extended periods of use.

“Scrapetec’s robust systems, which are virtually maintenance-free, extend the service life of conveyor belts and reduce cleaning requirements of the entire conveyor system. Apart from cost-efficient operation, these products also contribute to occupational safety, environmental protection and safety, by minimising dust generation and contamination.”

AirScrape

The contact-free AirScrape conveyor belt skirting system is a highly-effective side seal that lies over the conveyor belt, without contact, and creates negative pressure on the belt, due to its specially-designed lamella structure. Because this system hovers freely above the conveyor belt, skirt friction and belt damage is eliminated and service life of every component of the conveyor is extended.

The system encompasses inward facing, hardened-steel diagonal blades and operates according to a principle where it hovers 1-2 mm, on the left and right side above the conveyor belt.

These blades deflect larger particles inwards, while using the air-flow of the conveyor belt and conveyed material to create an inward suction, flowing any dust and fine particles back into the product flow. Through these diagonally fitted plates and the speed of the running belt, air is drawn from the outside inwards. As a result, neither the dust nor material can escape.

Conventional skirting is pressed against a conveyor belt to keep dust and material in the middle of the belt, but after a period, wear of the skirting and belt can be so severe, that material and dust escapes. Material spillage at transfer points needs to be removed and regular maintenance of belt skirting and transfer points is necessary.

Studies show, that even five years after installation and with continuous use in harsh conditions, the AirScrape system hardly shows any signs of wear. Operational costs are also reduced because there is no need for spillage collection, regular maintenance, or replacement parts.

TailScrape

The TailScrape system enhances performance of the AirScrape, by sealing the transfer tail in the rear area and also works according to the Venturi concept, to prevent dust generation and material spills. The intelligent blade structure on the underside of the system, creates negative pressure in the conveying area, preventing the escape of materials. Dust is kept in the material flow by air intake.

TailScrape is mounted to the existing AirScrape system, so that it seals the transfer to the bend, averting dust generation and material spillage, also reducing the risk of explosion.

A metal sheet is used in the rear area of the transfer, matching the contour of the belt trough and installed approximately 20 mm from the belt. The TailScrape is shortened to the distance between the two AirScrapes mounted on the side and bent to fit the trough. The TailScrape is fixed and adjusted to the sheet by means of slotted holes and lifting elements, allowing almost no gap and no contact with the belt.

DustScrape

For production areas with excessive dust generation, BLTWorld recommends installation of the DustScrape. This dust emission prevention system comprises a filter cloth, support arches and skirts, arms to hold the system above the belt and a rubber curtain to eliminate further dust development – all sized to specific requirements. This system is easy to install and can be retrofitted to existing conveyors, for continuous operation and for extended periods.

The durable filter cloth, which retains dust particles created by conveyed materials while remaining permeable to circulating air is available with different qualities, including anti-static features, for specific applications – for example, in underground mining.

The highly-effective, energy-free DustScrape dust emission prevention system, complies with most new dust prevention guides and prevents health and safety issues on-site. This system also minimises product loss, by effectively preventing material from being blown into the surrounding environment.

For more information contact Ken Mouritzen, BLTWorld, +27 31 274 8270, ken@bltworld.com, www.bltworld.com





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