Precautions for Changing Materials and Cleaning BB Fertilizer Mixers
When changing formulas or raw materials in a BB fertilizer mixer, inadequate cleaning can easily lead to excessive nutrients, material mixing, and cross-contamination, directly affecting the finished product’s qualification rate. The following aspects should be emphasized during cleaning:
Shutting down the machine and disconnecting the power is the primary safety prerequisite. Before changing materials and cleaning, the main power supply and control switch must be turned off, and maintenance signs must be displayed to prevent accidental equipment startup and injury. Cleaning work should only begin after the equipment has completely stopped.
Focus on cleaning the mixer’s internal dead corners. First, open the observation port and discharge port, and manually remove any clumps of material adhering to the mixing shaft, blades, and inner wall of the machine. Then, thoroughly blow away any remaining powder with a brush or high-pressure air gun, paying particular attention to the blade roots, the four corners of the cylinder, and the discharge port, as these are areas prone to material accumulation. Do not directly wash the electrical control box, motor, and bearings with water to avoid moisture damage.
Clean the supporting conveying and screening equipment simultaneously. The feeding hopper, belt conveyor, finished product silo, and screening machine should also be cleaned together to prevent residual material from flowing back and causing secondary contamination. Before changing materials, check for blockages and bridging to ensure no residual material remains on the entire BB fertilizer production line.
Control the cleaning sequence and production schedule rationally, following the principle of producing high-purity raw materials first, then switching to ordinary formulas; producing inorganic fertilizers first, then cleaning and producing formulas containing bacteria or added trace elements, to reduce cleaning difficulty. Due to the high risk of residue from trace elements and functional additives, after cleaning, run a small amount of new raw material through a dry agitation to remove residual material before formal production.
After cleaning, seal the equipment and verify the types of raw materials in the new formula to avoid incorrect material input. Maintain thorough cleaning records, clearly specifying the cleaning time, operators, and material change type. Strictly adhere to standardized procedures to prevent cross-contamination, extend the lifespan of the mixer, and ensure stable BB fertilizer product quality.
