To get a sensible reply give us some information about the application!!!

Material, density, lump size, capacity, length etc, etc. ■

You are caught in the Bermuda Triangle of Belt Tensile Strength, Belt Cover Durability & Carrying Idler Capacity.

Give us a clue about the application & it might go further as a topic instead of deteriorating into a feeder sales pitch! ■

Separate from other issues, the belt feeder width appears to be too small. The belt width should be on the order of 115 inches.

At 84 inches and your given max belt speed, the bed depth will be close to 90 inches, with a 70 in skirt width.

At 115 inches, the bed depth is close to 70 inches with a 96 inch skirt width.

The slot configuration, skirt slope morphology and exit shear restriction geometry are all critical to good design practice (minimum demand power) and any interest in mass flow.

The only benefit of the apron feeder is its protection against the possibility of tramp metal damage and high ore pressure over the slot opening. Note, you need a wide slot at the exit point with your low speed select.

Some copper ore installations have increased the max design belt speed closer to 100 fpm in order to minimize the slot width and its many ramifications.

You can save a great amount of power with a prudent design.

Need help? ■

Dear Sir,

Your lump size is 300 mm & capacity is too high. You cannt get belt feeder of such capacity. I suggest you should use apron feeder . I also presume that it is placed below the bin.

Regards.

A.Banerjee ■

I posted this for a similar thread with harsher requirements:

"I have provided 2000 t/h belt feeders instead of apron feeders handling blasted copper ore, from 240 ton haulers (trucks) to the primary crusher. These were very successful but the heaviness of the belting, live shaft (lagged) rollers and structure would surprise you. I am confident that your proposition is possible."

Your application is much easier then the belt feeders described in the above response.

I have provided a belt feeder for an application closer to yours at an Arizona copper mine. The copper ore came from the primary crusher above.

Joe Dos Santos ■

Yup; live shaft rollers is a bit surprising, & heavy. ■

There was much energy absorption modeling, calculations and subsequent testing.

Independent tables, of two rolls each, under the loading area, were mounted on suspension springs. The energy impact absorbing value of the springs was insignificant because of the amount of inertia to overcome before affecting the springs. Furthermore, sealing requirements caused us to limit the deflection and hardening the spring suspension system. The energy and impact absorption happened at the belt and at the thick lagging on the rolls as the impact penetrated the belt which spread the load as it squished the thick lagging at the roll. Polyethylene on thick hollow rubber, recessed from normal belt contact served as belt saver breaker bars between the rolls. And there is much much more that will take too long to address here.

This was a great project and after the first blasted ore aplication came the application in Arizona, under the primary crusher. The Arizona installation was pretty straight forward after tackling the hard one first.

Joe Dos Santos ■

Originally Posted by leoniekaritz

Hi Afsaneh,

I have a friend who is quite familiar with the topic. His company has been working with hazemag's apron feeder for some time now. I'll meet him next week. Then I can ask him if he knows the limitations for the design you have mentioned. Best regards!

This thread is 12 years old I doubt he needs the help anymore. ■

Hello,

You have mentioned feeder of 48 feet (14.64 m) length. Please clarify whether this equipment is feeder or conveyor. Such length is common as a conveyor. However for feeder, if it has to draw out material from such a length it is difficult and expensive. Show arrangement or describe how it is to function in context of controlled / regulated feed.

Ishwar G. Mulani

Author of Book: ‘Engineering Science And Application Design For Belt Conveyors’. Conveyor design basis is ISO (thereby book is helpful to design conveyors as per national standards of most of the countries across world). New print Nov., 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 ■