Challenge
Semi automatic mill liner short life, discharge end cover leakage, processing capacity decline and other problems, for this reas on, the user hopes to optimize and improve the complete set of mill liner from structural design and material selection.
| QUESTION | ANALYSIS |
| The shell liner is frequently cracked and has a short life; Low run rate | The structure design of the cylinder liner is unreasonable, and the cross section size changes too much and the heat treatment is easy to produce cracks; Material selection and heat treatment processes are poor |
| Leaking slurry at leaking slurry | The discharge end lattice/gravel plate, cover plate, slurry lifter and center discharger are all made of Cr-Mo alloy steel, weig hing up to 180 tons, and the operating process is easy to shift and loosen bolts resulting in slurry leakage |
| Reduced capacity of output(t/h ) is decrease | 44 rows of Hi-Low-Hi configuration of cylinder liner, less material lifting and poor crushing effect; Linear radial lattice/grav el board nesting effect is not good |
| Unable to synchronize replacement, downtime increase | The discharge section and the middle section of the cylinder liner are seriously worn; The feed end liner plate near the material level line is severely worn |
Solution
- The new structure of the cylinder liner is 33 rows of 3 turns of the lifting strip, high flat high configuration, and the section of the lifting bar is a simple T shape, removing the bottom plate on both sides.
- Through simulation software simulation to determine the parameters, increase the surface angle, increase the height of the lifting strip, optimize the material trajectory, improve the service life and ensure the efficiency
- Optimize composition and mechanical properties, optimize pouring, melting, heat treatment processes
- The structure of the feeding end liner was changed to 4 turns, and the outer ring was replaced synchronously to save time and cost, the first and second made of steel rubber composite material structure, and the third and fourth turns were made of rubber material
- Except for lattice/gravel plate, all other liners are changed to rubber/steel rubber composite materials
- The lattice plate lifting bar and the outer ring slurry lifter were changed to arc shape to accelerate ore discharge