Installation and removal of liner of wet ball mill

Liner removal method

The rubber liner and the gold-steel liner in the liner of the wet ball mill are disassembled in the same way.First of all, clean up unnecessary raw materials in the mill, and pour out the steel balls and other substances in the ball mill, and the steel balls should be blocked in accordance with the regulations.The liners of the ball mill are distributed in the body of the ball mill cylinder in different shapes and sizes, arranged along the circumference of the inner wall, and there are wedges of cloth at each quarter. When disassembling, the parking position should be on the horizontal center line of the fixed wedge.

Then, starting from one end of the inlet or discharge port, after removing the bottom adjustment wedge iron, the liner is gradually removed in an orderly manner. At this time, the symmetrical fixed wedge on the horizontal center line cannot be removed.After the lower liner is disassembled, the ball mill cylinder is slowly pulled and rotated 180° by a hoist, and the other half of the liner is removed. After disassembly, one circle is a cycle, and the liner removal requires several cycles.The cylinder of the ball mill should be fixed before the liner of the ball mill is removed. The method is to hang the two wire ropes suspended from the ball mill on the hand-drawn hoist separately, and place them on both sides of the cylinder to fix and tighten to prevent sudden rotation of the weight.

Finally, clean up the inner cavity of the mill and check the damage to the mill cylinder and bearing end caps.

Note: During the disassembly process, you need to pay attention to safe operation to avoid accidents.At the same time, care should be taken to protect the ball mill cylinder and other components to prevent unnecessary damage during disassembly.

Liner installation method

Before installing the ball mill liner, sufficient preparations need to be made.First of all, we must understand the model specifications of the ball mill in detail, implement the parameters such as the type, size, shape, and quantity of the liners required for the ball mill, and purchase and place the liners of the ball mill before replacing them.Secondly, implement the types, sizes, shapes and quantities of bolts, screws, seals and other parts required for the liner of the ball mill, and purchase them in advance.Finally, check whether the maintenance tools such as hoisting steel ropes and crowbars are in place, and strictly inspect the lifting equipment.

The specific installation steps are as follows：

1.Before installing the liner, the dirt and dirt in the cylinder body should be removed. When the ball mill installs the liner, a layer of 1:2 cement mortar should be applied between the wall of the cylinder body and the liner, and the liner bolts should be tightened while it is wet.The gap between the liners is also smoothed with sand and slurry.

2.The backing plate should be inspected and trimmed before the ball mill installs the backing plate. The back and surrounding areas should be smooth and smooth. The bolt holes should be thoroughly sanded and the casting flying edges removed so that the bolts can penetrate smoothly.

3.The bolts that fix the liner should be carefully padded with gaskets to prevent leakage of the slurry.

4.Directional liners should pay attention to the direction and should not be reversed.Long mills are generally separated into two front and rear silos by a compartment plate.The feed end is the first compartment, and the first compartment is a stepped liner.When installing, the thin end of the stepped liner should be consistent with the direction of the arrow in the direction of rotation when the mill is working.The grate hole of the compartment plate is tapered, and the large end of the cone should be installed in the same direction as the discharge direction of the ball mill.The cylinder liner cannot form an annular gap.

5.When installing the compartment plate, all the bolts should be worn, and then the bolts should be tightened gradually in three stages.At the same time, it should be noted that the connecting bolts on the center disc of the cylinder body should be tightened first and then the bolts on the cylinder body should be tightened.After all the bolts are tightened, the nuts of the bolts on the central disc of the cylinder body are “spot welded” with electric welding to prevent loosening.

6.After the cement mortar solidifies to meet the strength requirements, it can be fed for test runs.The bolts are found to be loose during operation and must be tightened in time.

Precautions during installation：

The liner must not be skewed.A cushion plate should be added to the contact surface between the cylinder body and the liner.The gap between the pressure beam and the liner is filled with sponge and other substances, and the filling is required to be firmly attached or installed.The gap between the liners should be installed and adjusted evenly.The cylinder liner close to the end cap should be as tight as possible to both ends.The cylinder liner and the end cap liner should be installed at the same time.If there are other technical problems, you should seek the help of management personnel in time.

In short, the installation and disassembly of the liner of the ball mill is a complex and important work, which needs to be carried out in strict accordance with the operating procedures to ensure the normal operation and service life of the ball mill.