Hi George,

A high-speed belt feeder should be able to handle the tonnage. I would suggest using a good quality straight warp construction to withstand impact variations. Also, since you mentioned that the belt is to be flat or nearly flat, consider using floating UHMWpe side curtains to contain the material.

Regards, ■

Dear Mr. George,

From your query, it appears that your focus is to know about the suitable type of feeder below the hopper or suitable arrangement of hopper and feeder. You have given certain information but it is more related to overall system. If your focus is hopper and feeder, then mentioning of following information will enable the respondents to give more useful suggestions :

1) Hopper top mouth opening.

2) Hopper bottom outlet opening

3) Hopper depth

4) The material fall height from bucket to the hopper top.

5) Whether sand is dry or wet.

6) Whether sand and gravel is mixed or would be handles separately

7) Bulk density of material as to be handles by the system. Also the lump size, shape of gravel etc.

If you opt for belt feeder you can have advantage of keeping outlet of longer dimension which will help you to keep the hopper height less to achieve the necessary capacity.

If you opt for vibrating type of feeder then you will have a comparatively smaller opening length and somewhat more height for the hopper.

You have mentioned material is fed by particular equipment. Please specify the quantity of material (bucket volume) which would be dumped into the hopper at a time. Ideally hopper capacity can be equal to the bucket capacity but exact matching of loading cycle and emptying process is not feasible (impossible). So, hopper size has to be at least twice the bucket volume or more. Please use your experience in decision on this issue. The size of the hopper will depend upon the overall system and discipline being observed in the plant during operation.

You have mentioned the handling rate of 1200 stph. This means capacity is not small. So, possibly you have to have feeder and then conveyor. If you wish to have a belt feeder cum conveyor, then it would be uneconomical to opt for its longer length.

This isuue is to be judged by you because it will depend upon options and constrains etc., and importance being attached to various considerations.

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.

Email : parimul@pn2.vsnl.net.in

Tel.: 0091 (0)20 25882916 ■

George - call me at home or at my part time job before you do anything!!!!

Very easy easy to solve this with a W.R. Stamler Conveyor Belt Feeder that is skid or track mounted, can be as self contained as you need it- with breaker or no breaker product size reducer-auto lube, 480 volt, hydraulic drive, PLC controls, etc.

A low profile unit would be perfect for

your needs.

Your client will be able to bypass the need for a pair of loaders if his shipper is using an offloading boom providing it can feed directly to the feeder-the unit uses a dual chain and flight configuration to move material, simple, and easy

to maintain-with sand and gravel it will need little maintenance.

One or two gear boxes depending on configuration- one for feeding only or two for primary breakage and feeding. I do not remember the drive chain size--220 H double row I think with shear pins in the flight chain driven sprocket and the breaker sprocket.

It uses a flywheel for momentum driven off gear box for breaker assembly-not used for feeder drive as it has a huge number of flights for material take away-perfect for what your client needs.

No sense dumping it on the dock and rehandling it if it can be fed right into the feeder from the ship unloader bypassing the need for a pair of front end loaders- besides that these machines can and do carry more away faster than they (the loaders) could load it-so a smaller unit could be used if your client wished.

No fuss, no muss, no spillage with a big hopper. Easy clean up and maintenance as nothing will be buried and it will feed the stacker directly with out any extra controls etc.

A 36 inch WR Stamler belt feeder should fit nicely with what your client needs with few problems.

I will be home until 5-5:30 pm on sunday night 607-273-0984

After six PM 607-257 3417

Call me and I can help more.

leon Z

607-273-0984

"Semper Excelsior"

Google (WRStamler) ■

do you have a few pictures of this feeder? maybe a website for information? thanks,

conveyorsales.com ■

Hi there George...

We successfully built a belt feeder for tailings sand which is fed by the same CATS.

Important in the design is the huge wollop that you get when you drop about 8 tons of sand in the hopper. We based the design of the structure and idlers for the huge impact loads..(just as well), and spillage must be avoided.

Also, high speed would be tricky as you need a huge pull away force, and this would require a massive drive, unless you did a fancy hopper arrangement to relieve the vertical load on the belt.

This takes too much height though.

Ours does about 500t/h of sand and is therefore a 1050mm belt, at low variable speed up to .75m/s.

We did a few higher tonnage mobile feeders but chose to use hydraulic drives for the tremendous pull out requirement.

We have since done 7 more high capacity wide belt feeders with silos over them and are currently designing six more, and believe me, it is quite a science, and not to be entered into lightly as they say. None of them exceed 1m/sec

The other point is that to avoid the massive pull out force you ideally need a throat arrangement that breaks the stress field.

If you break the stress field you have an arrangement that spills when you drop in the load when fed by loaders.

Good luck

LSL Tekpro ■