Wear, breakage, and loosening of mixing blades are common issues in organic fertilizer double axis mixers. Simultaneous optimization across four areas—material selection, operational control, installation and maintenance, and raw material pre-treatment—can significantly reduce the frequency of fertilizer production machine downtime for repairs.

Prioritize upgrading blade materials to reduce the rate of wear at the source. Standard carbon steel blades have poor wear resistance, thinning and deforming quickly; switching to high-manganese alloy blades or those with hard-faced wear layers for long-term production can extend service life by two to three times. When materials contain significant amounts of silt, sand, or sludge, thickened wear-resistant liners can be attached to the blade's working surface; this allows for the replacement of just the liner rather than the entire blade when wear occurs, thereby saving on spare part costs. Use high-strength, anti-loosening bolts paired with spring washers to mitigate loosening or blade detachment caused by continuous equipment vibration.

Manage feeding conditions to minimize blade impact and overload-induced wear. Large hard lumps, stones, and brick fragments can easily strike and crack the blades; therefore, upstream crushing and screening equipment is essential to intercept hard debris beforehand. Avoid bulk feeding; material accumulation and overloading increase torque on the blades, leading to deformation or breakage—instead, maintain a uniform, continuous feed. Strictly control material moisture content; excessively wet raw materials adhere to the blades, increasing the operational load. Implement periodic spraying to clear adhered material and prevent accumulation-induced weight gain, which accelerates wear.

Standardize installation and routine inspection/maintenance procedures. Ensure uniform installation clearances to prevent continuous material erosion on specific sections of the blades. Inspect blades for damage and check for loose bolts after every shift; perform timely repair welding to reinforce areas with minor wear and prevent small issues from escalating. Regularly clear accumulated sand, stones, and hard lumps from the bottom of the mixing trough, as long-term accumulation of hard debris grinds against the blade bottoms. Tighten all blade fasteners every two weeks to prevent loosening or detachment due to vibration.

Optimize operational habits to extend the service life of the blades. Operate the equipment without a load before gradually introducing material; forced startup with a load is prohibited to prevent instantaneous, massive torque from tearing the blades. Minimize frequent start-stop cycles, as the resulting shock loads accelerate fatigue cracking in the blades. Adjust the dual-shaft rotation speed—reducing the mixing speed for materials with high fiber or sediment content helps lower frictional wear. Additionally, regularly lubricate the main shaft bearings to ensure smooth rotation, minimize uneven blade wear caused by eccentric loading, stabilize mixing performance, and reduce downtime due to blade-related issues.