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Determining Idler Spacing

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Determining Idler Spacing

June 10, 2023 nflg 0 Comments


Normal Spacing (Carrying and Return Idlers) – See Table 10 for recommendations.
Terminals – Distance between nearest standard carrying idler and pulley.
Loading Point (Impact Idlers) – Normally, one-half the carrying idler spacing is recommended. For fine materials, place the idlers as close together as possible.

Convex Curves – One-half of normal spacing unless radius is small, then space closer.
Graduated Spacing – Consider this spacing only for long center distances and high tension (200lbs. per inch of belt width and above.) See Rexnord for recommendations.

Belt Training Idlers – Rexnord recommends the use of one training return idler approximately 12 to 15 belt widths before the tail or take-up pulley. Also place training idlers at approximately 100-foot intervals on the carrying and returns runs.

Spiral or Rubber Disc Return Idlers – Use two or three behind the head pulley. For very severe service, equip the entire return run with these idlers.

Side Guide Idlers – Use only to insure against serious belt damage that may be caused by the belt running against the conveyor support structure. Place near the possible obstruction. They are not a corrective device.


Horizontal Labyrinth With Wiper
The unique design of this seal helps keep dust out and grease in. This is fundamental, because if grit enters the operating parts and oversized bearings they will quickly become useless.

The labyrinth seals properly hold the lubricant within the bearings. Regreasing will flush the bearings and seals of any contaminants.

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