Originally Posted by shashi

Dear sir,

how to calculate belt tension due to internal v type scraper ,

regard

shashi

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Hope this adds value to your design.

A rough rule-of-thumb is about 45 N/m of belt width per scraper. ■

Hello,

The calculation for resistance by belt cleaners (belt scrapers) is simple issue.

1) The designer has to choose design pressure between rubber blade (or other material of blade) and belt. DIN mentions this 30000 to 100000 N/sq. m (0.3 to 1.0 kgf/sq. cm). Pressure value in this range will be according to severity of stickiness of material. For routine dry materials, it will be quite close to lower value.

2) Cleaning / friction coefficient is in the range 0.6 to 0.7.

3) Find the contact pressing area between blade and belt. It will be rubber blade contact length multiplied by rubber blade width in contact with belt.

4) Resistance = (Blade rubbing area) x (Contact pressure perpendicular to belt) x (Friction coefficient).

ISO and other standards have also similar formula.

Above method is applicable to internal scraper, external scraper and also discharge plough (with appropriate considerations).

Ishwar G. Mulani

Author of Book : Engineering Science And Application Design For Belt Conveyors (new print November, 2012)

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: conveyor.ishwar.mulani@gmail.com

Website: www.conveyor.ishwarmulani.com ■

As per CEMA standard 5lbs/in of belt width can be considered for the force required to overcome the frictional resistance offered by scrappers. The additional belt pull to overcome the resistance offered by belt cleaners generally lies in the range of 2lbs/in to 14 lbs/in ■