How To Replacing Cone Crusher Liners?
What are cone crusher liners?
The cone crusher liner is the main wearing part of the cone crusher during operation, also known as the cone crusher wear parts. It is made up of two bowl-shaped lining plates, the upper liner (which is called bowl liner or concave) and the lower (which is called cone liner or mantle). The area between the upper and lower liners forms the crushing chamber. When crushing the material, the upper liner plate is in motion and the lower liner plate is fixed, changing the size of the crushing chamber and the bottom discharge opening by the circular return of the upper liner plate. The cone crusher liners are generally cast from high manganese steel because of their hardening properties upon impact. Grades are Mn14, Mn18, Mn22.
Cone crusher liners include:
- Mantle, cone liner
- Concave, bowl liner
For more detail, check here!
Replacing cone crusher liners
Proceed as follows to dismantle a worn liner and replace it with a new liner :
- Remove the lift plate.
- Grind the 2 weld beads between the lock bolt and the spacer ring and between the spacer ring and the mantle. As the liner tends to expand during crushing, it may be difficult to remove the bolt. If this is this case, cut the spacer between the liner and the lock bolt with a torch to relieve stresses and strains on the bolt. When cutting the spacer ring, some precautions must be taken so as not to damage the head. The torch must be presented at a tangent to the spacer ring and it may be preferable to make a groove around the circumference before the final cutting. The lock bolt can then turn and extracted.
- Position the studded lock wrench (supplied with the tooling kit) in the holes on the lock bolt. Install the L30 washer and M30 bolt (supplied with the tooling kit) to lock the wrench onto the bolt. Hit the wrench with a sledgehammer to release the lock bolt.
- Chip off any backing material which might remain on the head. Usually, the backing material will adhere to the mantle and little, if any, chipping is required on the head.
- Whenever a new set of liners is installed, it is necessary to repour the backing material between the mantle and head and between the bowl liner and bowl. Prepare backing material as follows: Qiming Casting backing material is a tough, resilient, non-metallic backing material that is readily available in kit form in various sizes. Each kit contains a large and small can of backing material and a mixing paddle. The use of backing material requires no special equipment, preparation, or handling. The backing material is not reusable and, therefore, is expendable with the worn mantle or liner. With backing material, the backing can be mixed right at the job site as mixing and pouring requires no special training, the simple directions are included with each kit. Once mixed, the backing material must be poured without delay. Subsequent mixes that may be required to completely fill the cavity, can be poured at any convenient time. The backing material kits and the parts that require backing should be at room temperature prior to pouring 16° to 32°C (60° to 90°F).
- Check the threads on the head and the lock bolt. Remove any burrs or nicks which might exist and clean the threads thoroughly. Coat the threads with grease or lubricating oil.
- Apply a light coating of lubricating oil to the outside of the head and the inside of the bowl. This will prevent the backing material from sticking to either the head or bowl.
- It is important that the mantle is seated properly, a loose or cocked mantle can result in damage to the mantle seat on the head. Install mantle as follows: Before lowering the mantle onto the head, brush a 25 mm (1″) wide band of grease on the lower portion of the head seating surface. Check that the mantle has poured holes. If not, torch cut, two 25 mm (1″) x 40mm (1-1/2″) slots, spaced 180° apart, in the top of the mantle to pour the backing material; Lower the mantle onto the head using one of the lifting methods; Place the torch ring on top of the mantle; If the bolt is not replaced, check that it bears correctly on the spacer ring. If fitted incorrectly, the bolt threads or the head could break and the mobile liner would no longer be attached to the head; Screw the lock bolt onto the spacer ring. The gap between the lock bolt and the spacer ring must be identical. During assembly, the mobile jaw must be positioned correctly and aligned on the head before tightening the bolt. Merely tightening the bolt will not align the jaw correctly. The gap between the bolt and the spacer ring must be measured. Correct the jaw position by hammering the top or raising the bottom. Before tightening the lock bolt, the difference must not exceed 1 mm (0.040”).
- Sledge the locking bolt down tight to the center and position the mantle on the head.
- Check that the mantle bears tightly against the head by using a feeler gauge all around the mantle seat. Clearance should be no more than 0.25 mm (0.010″). Should any openings exist due to wear on this area of the head, pack these openings with clay, caulking, or glazing compound to keep the backing from leaking out during pouring.
- Paint a vertical line on the lock bolt and the spacer ring. Then heat the lower portion of the mantle (head seat area) with a torch. Heat the mantle to approximately 55° C (130°F). You should be able to touch the mantle but not hold your hand on it!
- Turn the bolt with the wrench until fully tightened. Check the mark. The lock nut should have turned approximately 25 mm (1 inch).
- After tightening the lock bolt on the head, weld 2 x 3.51 g: 50 mm beads in a diametrically opposed pattern between the mobile jaw and the bracer washer and between the bracer washer and the lock bolt. WARNING: The weld must not prevent the distributor cone from bearing on the jaw lock bolt.
- After the mantle has cooled, fill the entire cavity behind the mantle with backing material to just below the top of the head. It gives the approximate amount of backing material necessary to fill the cavity. Use the pouring holes in the mantle or torch cut, two 25 mm (1″) x 40 mm (1-1/2″) slots, spaced 180° apart, in the top of the mantle to pour the backing material. Make a pouring trough out of sheet steel or heavy cardboard to direct the backing material into the backing cavity. Pour the backing material in at several locations around the top of the head to speed up the pouring process. If pouring slots are used, they are to be covered with 3 mm (1/8″) steel plate after pouring the backing. Weld the plates to the mantle. This step is required to keep dust and moisture from seeping into the lock bolt and head threads.
- Install the head.
If you have any questions or inquiries about the cone crusher parts, contact us freely.