When Need To Change Cone Crusher Liner?
Cone crusher liner needs to be changed well before they are cracked, broken, loose, or have holes in them! If cone crusher liner pushed too long can and will lead to mechanical many problems with the Crusher:
- A thinning mantle and thinning bowl liner will flex.
- Flexing liners will crack out the backing material.
- Continued flexing will “powder out” the backing material.
- The flexing deteriorates the head and bowl seating surfaces.
- The seating surfaces eventually will need reconditioning as liners will no longer stay tight.
In our experience that too many people lean towards too late, the optimum time to change a liner really depends on how much money you are prepared to lose to production losses to get the maximum use out of a wear component.
The first condition that is optimum is that the liner change happens when you planned it. This gives you the opportunity to have all of the required parts on-hand before starting. This also allows you to perform other maintenance work on other equipment when the change is being conducted. These days it’s tough to get screen media and manganese on a moment’s notice and you will need to plan things if you need to rent a crane.
The second condition is changing the liner before you start to suffer significant production losses. On top adjust/screw adjust cones this is especially true as the feed size starts to shrink pretty dramatically as soon as you get to the last 1/3 of life and as you near the end the feed size can get very small, losing as much 30% of feed size. This is less of an issue with hydrocodones as the feed size remains constant throughout the life of the manganese.
You should have a pretty good idea when you will need to change manganese and be able to have all of the parts on hand prior to needing to change. By having an accurate belt scale, you can know to the day when your production starts to tail off to the threshold and schedule the change immediately.
What is the threshold for a liner change? We believe the maximum threshold for a liner change is as follows: Change your liners no later than a 10% decline in production.
Also, there are some other notices:
- Change the cone crusher liner sat the same time each time by watching the adjustment cap height. Some customers measure the distance between the underside of the adjustment cap and the top of the adjustment ring. This creates a reference point for the next liner change. Such as Nordberg GP series cone crusher, When the dimension is 10mm-15mm, the GP cone crusher liner needs change.
- Change the cone crusher liner at the same time each time by watching the total number of crushing hours on the liners. Some customers watch and record the total number of crushing hours on a set of liners. Once established, this creates a benchmark for the next set of liners. Such as Nordberg MP series cone crusher, most of the original crusher liners can work around 755 hours.
- Change the cone crusher liner at the same time each time by watching the total tons of material that passed through the set of liners. Some customers watch and record the total tons of feed material that passed through the liners. Once established, this creates a benchmark for the next set of liners.
- Change the cone crusher liner at the same time by watching for a reduction in throughput caused by the closing off of the liners feed opening.The volumetric area of the liner decreases late in liner life as the feed opening closes off. This results in lower throughput and a substantial loss in salable product. An excellent time to change liners is when a 10% loss of product is noticed.
How To Change Cone Crusher Liner?
- On the initial set of new liners, place a mark on the adjustment cap driver ring where the pinion tooth makes contact with a driver ring tooth when the target crusher setting has been achieved.
- Keep an accurate record of the number of teeth used to compensate for liner wear on this set of liners.
- After the initial set of liners have worn out, but before moving the bowl, record the total number of teeth the driver ring has moved and also paint a horizontal liner on the side of the dust shell just below the bottom of the adjustment cap. This will be the baseline for determining how close the next liner sets are to being worn out.
- When a new liner set has been installed, keep a record of the number of teeth the driver ring has moved and compared this number to the total number from the initial set of liners. This will give an estimation of the liner wear. The horizontal mark painted on the dust shell will also be indicated when the liners are approaching the wear limit. The approximate minimum heights of the adjustment cap (A-dimension) with worn liners are listed in the attached tables.
When changing liners and determining liner wear, follow the instructions in the related cone crusher instruction manual.