Re: Direct Bonded Ceramic Lagging
I have only had experiences with rubber-backed ceramic laggings & found the ones with adequate spacing between the tiles to work the best. In the states, I have not seen ceramic tiles boded directly to the pulley shell. However, I believe it is necessary to have the viscoelastic action of the backing rubber to keep 1) tiles from sheering of the pulley face & 2) some sort of give between the belt & the pulley. Even in rubber laggings, we depend on the viscoelastic motion between the pulley cover of the belt and the rubber lagging applied to the pulley. Applying ceramic tiles directly to the face increases the coef. of friction even more than that of rubber-backed laggings becasue there is no flexure between the tiles & the pulley face, so one of three things are going to happen 1) The pulley will spin on the belt causing slippage, 2) The tiles will sheer from the face, cause slippage & possible damage the pulley cover or 3) The belt will experience some mode of breakage. Which in high tensile, high modulus belts, it could be a steel cord pulling loose from the core rubber or the vulcanized splice (steel or fabric carcass). An so in theory, yes T1 would switch to T2 instantaneouly as the belt loses contact with the pully face. This, to me, allows no easy "transition" from T1 to T2, instead, an abrupt change that could put extra stress on the belt through the drive. Good luck.
Buddy Wilson
Application Engineer
Fenner Dunlop Americas ■
Re: Direct Bonded Ceramic Lagging
Hi 
We are using ceramic lagging in Takeup pulley of boom conveyor in one of our Twin Boom Stacker used for unloading iron ore fines.
Initially we use to face problems while stacking I/O at height of 12M with rubber lagging takeup pulley, slippage was more and conveyor use to trip at rated capacity and causing stopage of benificating plant. Therefore it was deicided to replace rubber lagging to ceramic lagging and our slippage problem was reduced.
We have not tried for drive pulley.
RK
India ■
Re: Direct Bonded Ceramic Lagging
Gomeke,I think thats how you spell it? Used to make ceramic lagging that had no rubber backing and was glued to the pulley with araldite epoxy. ■
Re: Direct Bonded Ceramic Lagging
Good morning all..
I only use ceramic tiles bonded straight onto the steel shell for use on both fabric as well as steel cord belts.
The secrets are that you must:
- Ensure the steel surface finish is clean and rough
- Use the correct epoxy....very important..
- Have adequate pulley shell thickness
I used to use the tiles that looked like ostrich skin, but successfully experimented on smooth ceramic tiles for the drive pulleys as well as for non- drive, as they are far cheaper, and I have never had drive slip at mu=0.35 with smooth tiles.
It makes absolutely no difference that I have seen to bottom cover wear, with or without the dimples.
I use 25mm x about 80mm tiles x 6 thick for non drive, and 8 or 10 thick for drives.
This is to get the same OD as a rubber lagged one for power sharing with dual drive pulleys with different types of lagging.
Use a 3 to 4mm gap twixt the tiles to let water out, and I think this helps the grip too.
I have always had bad experience with rubber backed ostritch skin type ceramic tiles.. they always come, off and its ridiculously expensive.
I have however had success with trowl on epoxy mixed with ceramic beads.. only with the correct epoxy though, otherwise it also comes off like a shell.
I did test work on the epoxies when I helped with SANS (previously SABS) 1669 part II.. I found that success or failure really did depend on the type of epoxy and how it is applied.
Cheers
LSL Tekpro ■
Alumina Ceramics, Zirconia Ceramics & Zta
Wear resistant ceramic lining – Alumina, zirconia & ZTA
Ceramic grinding media – alumina & zirconia
Steel & rubber backed ceramic plate
Pulley lagging
https://aluminaceramics.wordpress.com/ ■
Direct Bonded Ceramic Lagging
Dear Members,
I am looking for any information or experiences that you can help me with on the use of dimpled ceramic tiles directly bonded to steel drive pulley surfaces.
These are the small tiles with “buttons” that are more commonly fixed in horizontal strips in a rubber matrix that is then glued to the drive pulley, as made by Flexco and others.
The concern that I have is with the ability to accommodate “creep and slip” as the belt transits from T1 to T2 on the drive pulley. The rubber backed tiles have worked successfully with the creep and slip accommodated by the rocking/movement of the tiles in the rubber matrix - there is adequate movement for even low modulus fabric belts as well as steel cord belts, and the evidence of it working is there with no rubber scuffing as can occur with fabric belts on drive pulleys with cast type ceramic material.
If the dimples/buttons on the tiles physically lock into the belt cover, and the tiles are bonded directly to the pulley then must the relief from T1 to T2 not occur until almost instantaneously as the belt exits the drive pulley – and what effect is this likely to have?
I have looked at a couple of conveyors that have had drive pulleys changed from rubber backed to direct bonded tiles and have suffered cord breaks, on the edges at around the same time. These have reasonably tight snub pulleys directly following the drive pulleys.
While looking at transitions, build-up and the usual suspects, I am wondering whether the drive lagging is a contributor.
Thanks foy your help,
Ray ■