Hidden In The Detail But Clearly Seen
"I suspect that the transition between the horizontal belt to the tripper car is poorly designed."
Poorly designed or not: there is the inherent increase in roller loading because of the higher loading of the unsupported span. This will be the cause of higher roller wear.
Longitudinal marking is due to the laden belt conforming to the roller profile. The belt will initially contact the centre of the middle roller and a line of contact develops: laterally increasing as the belt emerges from the horizontal curve. This lateral displacement will translate to lateral force and when the lateral force encounters meaningful, but comparatively slight, disturbance as the belt climbs up the side rollers and tries to slip down the trough there will be higher compression at the point where the horizontal force meets the inclined force. This will result in marks along the belt in the corners and will occur whether the rollers have a gap or not. The forces are still there. Overlapped rollers spread the stress concentration as a UDL whereas a gap between rollers result in 2 point loads with a simply supported cross-section.
Just be thankful that you don't have garland idler set to contend with...or maybe you do? ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Longitudinal / Axial Wear On Trough Belts - Corrective Action
We have seen such wear behavior. One easy fix is to place small support rollers that traverse the axial wear zone, thus, eliminating the extreme pressure induced at the wear points. ■
Belt longitudinal wear
Hi all,
This is my first post in this forum.
I've been checking it for a while and its been very useful, thanks to all.
I have some excessive belt wear issues in a 400m grain conveyor belt.
The belt is getting worn longitudinally (two longitudinal marks all along the belt). The wear marks match with the space between horizontal & tilted rollers.
I have also checked the space between horizontal and tilted rollers in all roller stations.
The results point out that all roller stations are fine, except the ones on the tripper.
The rollers on the tripper car are more worn and there is an increase in the distance between horizontal and vertical rollers in the tripper car.
I suspect that the transition between the horizontal belt to the tripper car is poorly designed.
Looking forward for some comments.
Pat ■