How to determine the number of rollers required for high speed skis roller bed
the roller bed is about 2 meters long ，and the distance from one roller bed to another roller bed is about 2.5 meters，it needs 3 seconds to travel this 2.5 meters，the total weight of the skis and the payload is about 1.5 tons，the skis is about 1.6 meters long，my question is：
①、how can I determine the minimum number of rollers to achieve this high speed
②、What is the proper diameter of the roller
the roller bed is something like the photo in the Attachments
Accepted answer
Hello Arthur:
Based on my experience with conveyors for steel bars, I can give you two or three aspects to take into account to define the number (and maximum distance) of rollers and their minimum diameter:
1) The length and flexibility of the load: if the load to be transported is very rigid, it could tend to rest on only two rollers and remain without contact on others (which requires leveling them very well to avoid skidding). If the load is very flexible, it can come to rest on several rollers but also on the surface of the table, if those are very far apart, and increase friction and difficulty in dragging.
2) Center of gravity of the load: if the load does not have its mass uniformly distributed, the center of gravity area will tend to fall on one or more rollers and lighten the rest, with the eventual loss of drag.
3) Fall of the end of the load: either due to the flexibility of the load, the position of its center of gravity and the distance between rollers, the end of the load tends to descend (even touching the surface of the table). This is where the diameter of the spokes becomes important, since the small ones become an almost frontal obstacle for the end of the load (which could crash and stop there). On the other hand, larger diameter rollers have a gently angled shock front, which allows the end of the bar to be lifted and mounted on the roller. In any case, this is observed taking into account the height between the top of the rollers (where the load is supported) and the surface of the table (which is usually left several millimeters below, trying to ensure that the load does not rub against it. ).
I hope these ideas are useful to you.
Kind regards
