Capacité de broyeur à mâchoire fixe déverrouillée: Du granit canadien au minerai de fer australien

1. Le “Hungry Jaw” Paradox

Overfeeding >500mm rocks reduces throughput by 40%.

Solution:

Install grizzly screen with 300mm spacing.

2. Ghost blockage: the invisible killer of the crushing chamber

The material is unevenly accumulated in the crushing chamber, resulting in a 30-50% decrease in actual production capacity, which is common in flaky materials or ores with high clay content.

Solution:

Step-type pre-screening: Install a double-layer vibrating screen (upper layer 300mm screen hole, lower layer 50mm) before the feed inlet. Chile’s Escondida copper mine reduced the blockage rate from 17% pour 3% through this solution.

Cavity modification: Use asymmetric toothed liner (upper tooth pitch 120mm, lower tooth pitch 80mm) to guide the material to flow to the discharge port.

Intelligent purge system: Install compressed air nozzles to automatically clear dead corner accumulation every 15 minutes (Australian FMG iron ore increased production capacity by 22%).

3. Bearing overheating: the silent capacity devourer

When the bearing temperature exceeds 85°C, the equipment automatically slows down, directly resulting in a 40% decrease in production capacity.

Solution:

Lubrication upgrade: Use NLGI 2 grade polyurea-based grease, which has a temperature resistance 60°C higher than traditional lithium-based grease (data from Quebec granite mine in Canada).

Thermodynamic transformation: Add heat sink fins + forced air cooling system to the bearing seat, and the Turkish Boratas BCK series has a measured temperature reduction of 18°C.

Intelligent monitoring: Install wireless temperature sensors to automatically adjust the feed speed when the temperature difference is greater than 5°C.

4. Vibration imbalance: invisible production capacity loophole

A 0.2mm basic horizontal deviation will cause the vibration value to exceed the standard, forcing the equipment to operate at a reduced frequency, resulting in a fixed jaw crusher capacity loss of 25%.

Solution:

Laser alignment system: Use laser alignment instrument to control the installation accuracy within ±0.05mm/m (the vibration value of the South African gold mine was reduced from 7mm/s to 2.3mm/s after application).

Dynamic counterweight technology: Install adjustable counterweight blocks on the flywheel to balance the eccentric shaft torque in real time (Improving production output stability by 19%).

Elastic foundation transformation: Use rubber-steel composite shock-absorbing base to absorb high-frequency vibration energy (the Vale case in Brazil reduced production capacity fluctuations by 37%).