Malfunctions in the batching and discharge stages of BB fertilizer production lines—such as material bridging/arching, clogging due to caking, inconsistent discharge rates, and weighing inaccuracies—stem primarily from moisture absorption and caking, poor silo design, and the aging of discharge components. These issues can be systematically addressed through five key measures: silo modification, auxiliary arch-breaking, discharge equipment upgrades, raw material control, and routine maintenance.

Optimize the internal structure of the silo to minimize wall adhesion and arching at the source. Standard vertical silos with hopper angles under 60° are prone to material accumulation; modifying the hopper to a steeper angle (65°–70°) and installing anti-stick polyethylene liners on the inner walls reduces the adhesion of urea and potash. Designing hopper corners with smooth, curved transitions eliminates dead zones where material accumulates, preventing long-term caking buildup that could block discharge. For small-capacity bins containing trace elements—which are prone to flow interruptions—increase the bin height to expand capacity and install a dedicated small agitator to assist with discharge.

Upgrade to multi-stage arch-breaking and discharge systems. Since single vibration motors often lack sufficient force and fail, combine them with pneumatic hammers and bottom-mounted augers for a dual-mode arch-breaking approach. Operate vibrators intermittently to prevent silo structural cracking caused by prolonged vibration, and install internal agitator blades in scenarios with severe caking to break up large fertilizer clumps. For discharge augers, select thickened, wear-resistant blades with increased pitch to prevent fine fertilizer from sticking and wrapping around the shaft; use variable frequency drives (VFDs) to stabilize flow rates and prevent sudden, massive discharges that cause weighing errors.

Control raw material moisture content and impurities through pre-treatment. Limit the moisture content of incoming straight fertilizers to under 2% and ensure raw materials are covered and protected from moisture during rainy weather. Install a rotary screening machine at the feed inlet to remove hard lumps and cakes before material enters the silo, ensuring large impurities do not enter the auger and clog the discharge outlet. Store fertilizers with different specific gravities in separate bins to minimize mutual adhesion and caking.

Calibrate and maintain weighing sensors and electronic control systems. Regularly blow dust off the loss-in-weight scale sensors and ensure they are properly wrapped for waterproofing and moisture protection to prevent measurement drift caused by dust accumulation or dampness. Configure a flow rate buffer zone within the control program to automatically slow down and adjust the feed rate during irregularities, thereby minimizing alarms triggered by tolerance deviations. Replace worn seals and bearings to prevent material leakage or auger jamming.

Establish standardized daily operation and maintenance procedures. Empty the hopper at the end of each production shift to prevent stored material from absorbing moisture overnight; weekly, clean fertilizer buildup from the hopper walls and inspect the vibration motors and pneumatic hammers on the fertilizer making machine for malfunctions; calibrate the entire weighing system monthly. Thoroughly clean the hopper during product changeovers to prevent residual fertilizer from caking and contaminating the new batch. Implementing these combined measures can virtually eliminate feeding-related issues such as material flow interruptions, uneven discharge, and incorrect nutrient ratios.