Re: How To Determine Transition Distance
1. Judgement - though it is probably going to be similar to the nominal carry spacing.
2. Generally calcualted / drawn. You can specifiy packers are supplied loose to site and the contractor has to string line etc if desired.
3. The required trough angle depends on the idlers location within the transition. The requirement for an idler is subject to confirmation of belt properties (refer1.) etc.
This may be of use:
https://forum.bulk-online.com/showth...ulley-Position
Regards,
Lyle ■
Re: How To Determine Transition Distance
Hello Lubee,
The belt segment at transition zone is compelled to create difference in its length, between outer (upper) portion and bottom portion, due to geometric reasons. This tends to create buckling in middle portion and stretching of belt outer portion.
The transition distance can be taken as per published data or specific calculation, depending upon design / application sophistication.
The transition will be large for lower tension belt and also when belt tension is higher.
Transition distance should be calculated for occurring minimum tension and occurring maximum tension in transition zone.
The reader can use method of his choice. This being an important issue, my book describes one method.
The raising of terminal pulley reduces transition distance, but too much raising has other adverse influence such as reduction in belt aligning action in this zone, attributed to ‘bow string effect’. In general the pulley raising is limited to ‘approximately’ 25% of the side rollers’ vertical height. Well one can use the raising height as per his choice.
Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Author of Book : Belt Feeder Design and Hopper Bin Silo
Advisor / Consultant for Bulk Material Handling System & Issues.
Pune, India.
Tel.: 0091 (0)20 25871916
Email: parimul@pn2.vsnl.net.in ■
How to Determine Transition Distance
Hi guys,
When you design an idler conveyor, how to determine the transition distance from terminal pulley to the last troughing idler for both drum and wing? In the book "belt conveyors for bulk materials", it recommended minimum transition distances from terminal pulley to the last troughing idler. But how can I make sure the belt will not skip the last troughing idler if it is too far from terminal pulley. Is there rule to set up the distance? Also if the conveyor is running real light duty, for say material weight is only 0.5 lb/ft, and the PIW is only about 15% of the belt rating tension, does it necessarily need a 20 degree troughing idler as a transition idler between terminal pulley to 35 degree troughing idler? Sometimes our belt is just skipping the last 20 degree troughing idler towards the drum pulley because the wing pulley is always a loading zone.
Thanks,
Lubee ■