Renold designs conveyor system for Promat
A
Renold Chain product story
Edited by the Engineeringtalk editorial team
Aug 3, 2009
Renold Chain has helped with the design of a complex system to convey heavy, fire-retardant board through a hot drying oven at the end of its manufacturing process.
The power transmission system to drive the conveyor was designed by Potteries Power for Ceramic Drying Systems (CDS), which in turn was manufacturing the oven for Promat of Glasgow.
Promat required a new oven with an internal conveyor system to carry wet board through a drying cycle at the end of the manufacturing process.
The conveyor was designed with two strands of 6in pitch, solid-pin conveyor chain with special K2 attachments on each pitch.
The two strands of chain ran parallel to each other and had to be perfectly aligned so that each pitch was in exactly the same relative position with its partner on the other chain.
A series of wickets was then attached to either side of the twin-stranded chain conveyor, with one wicket on each pitch of chain.
The wickets were like two legs forming part of what was essentially a series of metal trays that would carry the wet board through the oven during the drying process.
Each tray had two metal feet, or wickets, that were fastened to the special attachments on each corresponding pitch of chain.
The challenge in designing the power transmission system and the twin chain conveyor was the sheer size of the individual components and the weight of each board, which was at its heaviest when it entered the oven at 280kg and half that weight at the end.
Each of the 6in pitches carried one leg of the metal tray, each weighing 80kg each so that when loaded with a new, wet, board the total weight on the conveyor was 360kg.
The temperature in the oven reached 180C and a special graphite lubricant had to be used that would be able to cope with the high temperature of the application.
In total, there were 284 wickets and the chain-carrying wet board weighed 1,837kg per metre reducing to 656kg per metre when the board had dried out.
Potteries Power designed a chain tensioner that would automatically account for expansion of the metal components when in the hot oven.
It also had to take chain wear into account and was designed in such a way that when the wear of each pitch reached 1.25mm the chain would have to be replaced.
The total length of each chain was more than 43m and it was critical that the wear to each side of the chain was identical and controlled so that each of the twin pitches carrying a leg of the tray remained exactly opposite to each other in the system.
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