Equipment & Technology

Carryback solution delivers easier maintenance

Martin Engineering has announced two new secondary conveyor belt cleaners, engineered for fast and easy maintenance.

Martin Engineering has announced two new secondary conveyor belt cleaners, engineered for fast and easy maintenance.

Operators at the Pueblo Viejo Dominicana Corporation (PVDC) mine in the Dominican Republic had a problem. The mine’s conveyor had excessive carryback and dust, resulting in expensive equipment failures, unscheduled downtime and increased maintenance.

The mine operates every day of the year, but the weather between April and October can lead the fine clay particles to become moist and sticky. The resulting material had the consistency of thick toothpaste and would adhere small chunks of aggregate to the belt, damaging the pulleys and headers.

The operators reached out to Martin Engineering to help find a solution. In two weeks, the Martin Engineering technicians had replaced the existing belt scrapers at 16 locations with its new range of secondary belt cleaners that could endure the hot summer temperatures, high moisture and constant production scheduled.

The DT2S and DT2H reversible cleaners feature a split-track blade cartridge that slides in and out on a stainless-steel mandrel, allowing them to be serviced or replaced without stopping the belt.

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Dave Mueller, Martin Engineering’s conveyor products manager said even when the cleaner is encrusted with material, one-half of the split frame can be removed so the cartridge can be changed in just five minutes.

“This allows users to have a spare cartridge on hand and quickly change it out when the blades need replacement,” he said.

“Then they can take the used cartridge back to the shop, clean it up and change the blades so it’s ready for the next service.”

The cleaners serve a wide variety of applications, ranging from mining, material processing and quarrying to cement production, food processing and other bulk material handling operations.

Both products significantly reduce material carryback, and they’re engineered to accommodate reversing conveyors to avoid damage to the belt or splicing. With steel blades and tungsten carbide tips set into a flexible base, the DT2 cleaners offer simple, effective solutions that can solve several carryback-related problems.

Martin DT2H Reversing Cleaner XHD
Designed for particularly demanding conditions, the DT2H Reversing Cleaner XHD is suited for heavy material loads on belts ranging from 400 to 2400 mm wide that operate at speeds up to 6.1 m/sec.

Carryback accumulations along the return run of the conveyor can occur when the cleaning systems on a conveyor fail to remove most of the material that adheres to the belt after unloading its cargo. Increased buildup results in unnecessary labor costs for cleanup, and can lead to premature failure of conveyor components if left unchecked.  

“Carryback can have an extremely sticky texture and abrasive nature, which can muck up conveyor components and contribute to premature failure,” Mueller said.  

“One key to the success of these cleaners is the blade’s negative rake angle (less than 90 degrees). With a negative angle, you get a ‘scraping’ action that mitigates potential belt damage, while delivering outstanding cleaning performance.”

Martin DT2S Reversing Cleaner
Like its larger counterpart, the Martin DT2S reversing cleaner can be installed on belts ranging from 400 to 4800 mm wide. 

Unlike the DT2H, the DT2S is designed for a lower maximum belt speed of 4.6 m/sec on belts with vulcanised splices. 

Mueller said this is primarily due to the difference in applications.

“The DT2S has a slim frame that allows it to fit in spaces as narrow as 178 mm. As a result, the DT2S can be attached to belts that may be too small for primary cleaners,” he said.

Both of the DT2 cleaners can be used in medium to heavy duty environments, providing a lasting solution to a diverse array of complex problems that are caused by carryback and minimising fugitive material. 

Following the upgrades, PVDC’s mine operations are now cleaner, safer and more productive, providing stakeholders with more confidence in the sustained operation of the mine.  

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