MC2-150B Bolt Punch for Ball Mill Liner Replacement

MC2-150B Bolt Punch for Ball Mill Liner Replacement

How a liner changeout actually runs

A ball mill liner changeout is not one job. It is a sequence: shutdown, access, bolt removal, liner handling, bolt reinstallation, torque up, restart. Bolt removal is the step that sets the pace for everything after it.

If bolt removal takes 15 to 20 days, the whole changeout takes 15 to 20 days plus. If bolt removal takes 5 days, the schedule changes.

The MC2-150B is built for that one step: getting the old liner bolts out.

Step 1 Position

The machine is brought into the mill and positioned at the bolt line. Horizontal and vertical lifting fixtures let the crew set up on both orientations without changing equipment. Guide sleeves help locate the impact rod on the bolt head.

Step 2 Impact

The impact rod is placed against the bolt. The operator selects joggling or continuous impact. The hydraulic system delivers 1500J of impact energy, with a vertical impact force of 3600J and a horizontal impact force of 1500J.

The rear of the impact body uses an air damping buffer spring with nitrogen charge. The operator does not feel a strong recoil, which matters when working overhead or in confined space.

Step 3 Repeat

Bolt after bolt, the same setup is reused. The impact body uses imported valve cores and seals, rated for pressure, wear, and heat, so the machine holds its performance across a full changeout. The impact rod is 42CrMo.

Step 4 Handover

Once bolts are out, the crew moves to liner handling. On a medium sized mill, the bolt removal stage takes about 5 days with the MC2-150B, compared with 15 to 20 days manually.

Technical data

Questions crews ask

Will it fit our mill?
It is built for medium and large ball mills. Send the mill model and we will check compatibility.

How fast is it really?
For a medium sized mill, bolt removal takes about 5 days instead of 15 to 20 days. Actual time depends on mill size, bolt condition, and site conditions.

Can one machine do both bolt directions?
Yes. Horizontal and vertical lifting fixtures with guide sleeves.

What about recoil when working overhead?
The air damping buffer spring and nitrogen charge keep recoil low. No obvious kickback.

Can we try it on site?
Yes. On site trial and working condition evaluation are supported. Impact rods and lifting fixtures can be customized.