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Belt conveyor is a common equipment for transporting powder and lump materials. It is widely used in cement, metallurgy, coal mine, coal preparation and other industries. According to the technological requirements, some belt conveyors start frequently and often under heavy load. Without soft start, the belt vibrates and resonates during starting, resulting in huge damage stress, large motor noise, belt slipping and breakage. After using SSR soft starer, the belt will be tensioned gradually at low speed when the conveyor starts, which reduces the mechanical impact of the belt, prolongs the service life of the belt, eliminates the impact between transmission gears caused by gear clearance, and reduces the maintenance workload.