Grate ball mills are commonly used to grind various ores and other materials with exceptionally high grinding precision. The liner of this equipment is a crucial component for protecting the equipment. Proper installation and use are crucial for the liner's effective protection. This article introduces the installation and improvement of grate ball mill liners:

Liner Improvements

1. Material Improvements

Grate ball mills can be difficult to install at the feed and discharge ends due to the heavy liner. To address this issue, improvements have been made to the grate ball mill's liner. Previously, liners were often made of high-manganese steel. While this material offers excellent wear resistance, its heavy weight remains a significant drawback. After careful consideration and improvement, rubber liners have been found to replace the original high-manganese steel liners. These liners are lightweight and have a long service life, without reducing the grate ball mill's capacity or affecting grinding efficiency.

2. Installation Improvements

Another serious problem with the grate ball mill's single-screw barrel liner is its tendency to fall off. After improvements, the cylinder liner is installed with long liner plates with double-hole screws, which is much more secure and stable than before. This not only increases the ability to withstand the impact of steel balls, but also avoids problems such as bolt fatigue fracture and liner detachment, saving time in frequent liner replacements.

Liner Installation

1. Feed End Liner Installation

A rubber strip is used between the rubber liner plates to secure the liner plate in place at the feed end. The dimensions of the rubber liner and strip can be customized to meet customer requirements. During installation, first place the filler strip at the intersection of the end cap and the cylinder. Place the end liner plate on top of the filler strip. Thread the bolt ends and press the lifting strip onto the end liner plate lugs. Next, place the next end liner plate and fasten the bolt nuts. Be careful not to tighten the nuts at this stage. Repeat these steps. After installing a portion of the end liner plates and lifting strips, insert the lugs of the center ring behind the end liner plates and lifting strips, tighten the nuts, and rotate the cylinder to install the remaining end liner plates.

2. Discharge End

When installing the discharge end liner, first install the discharger and tighten the bolts. The installation of other components is essentially the same as for the feed end, with the difference being that a grating backing plate is installed behind the grating plate.

3. Cylinder Liner Installation

The cylinder liner is still installed using screws, but now uses a double-hole liner. Importantly, when installing the cylinder liner, the liner is generally slightly longer than the mill cylinder, allowing for approximately 20% compression margin in the design. Once the installer inside the mill has installed a row of liners, the worker outside the mill must promptly tighten the nuts. When rotating the mill, every bolt must be tightened to prevent displacement of the liner and lift bar during rotation. Once all rubber components are installed, the mill must be rotated and the fasteners re-tightened.