We manufacture a very efficient quiet [typically 44 dB[A] when empty] range of 23Hz electro magnetic vibratory conveyors, we primarily work in the food industry but, also serve the pharmaceutical, chemical, foundry and steel industries.

We could not make a vibrator to the length you require in one unit but, could achieve this in 6 metre multiples dependant on the product.

If this is of interest to you please contact us.

Kind regards

Andy Cox

Commercial Director

Cox & Plant Products Ltd

www.coxandplant.com ■

Dear SFB: do you have a real name? :>)

1. You can add the 1/2" steel plate liners, no prob, except you MUST have new feeder designed from scratch to ensure we still maintain proper STROKE amplitude to move material. The supplier justs calcs in extra weight from KNOWN information.

2. Fiberglass panels are COMMON as a standard item and dependable and proven. No problem with these normally. I would not consider OUTDATED.

3. ROSTAS XL, but are a different theory than fiberglass springs. Two things: just double check with Original supplier or manufacturer TO ensure ROSTA is in fact ok to retrofit into this position in lieu of plastic springs. ROSTA will confirm if ok.

We use ROSTAS many times and regularly in lieu of coil springs on inclined or horizontal vibrating screens and the dampening of vibrations during shutdown is incredible. VERY quiet, controls hammering on shutdown beautifully...just a tad expensive VS coil springs. Last a lot longer than coils though.

Plastic panel DEFLECTION rate: Be very careful here, these are actually calculated to ensure we are STROKING the material plus minus 1" ahead to MOVE material from feedend to discharge end of conveyor length.

FLOW RATE: 55 degree off the vertical line is about right or normal setup and is CRITICAL actually.....it means we are stroking the material on every reciprocal movement down towards the discharge end to achieve TPH. IF WE were to adjust the stroke angle here......say to 90 deg from zero deg horizontal, the material would just GO UP AND DOWN and not move towards the DISCHARGE END at all and make flowrate ZERO.

If speed is faster with ROSTAS, slow motor down......is it variable or fixed speed? ROSTAS are used on lots of these rigs with no problem at all. Just have to do the homework with ROSTA and the factory that supplied MR FEEDER.

SUMMARY: if you have had no major problem with the leaf springs setup maintenance wise, stick with what you have. If maintenance problematic with fiberglas.......consider change.

If it aint broke.......Coil springs are common as well.

This is a straight PAN feeder, no grizzlies or perf plate to remove dirt etc I assume.

AR 400 1/2" thick liners.......is there a big problem, wearing out pan bottom here? I assume it had liners originally?

Probably MILD STEEL LINERS....like AR 250 maybe? I would suggest stay with original liner thickness......just upgrade to better ABRASIVE RESISTANT number....(AR400).

You gain liner life but, do not have to recalculate the planet here, decrease bearing life and achieve the same end.

...................................

LASTLY, A brute force twin shaft feeder would not be applicable here.......45 foot long......excludes....BUT, it would do the job....easily at say 20-24 feet long all day. Different theory but, same result. ELECTOMAGNETIC feeders here....not big enough length wise.

Hope this helps.......let me know if any further questions. ■

So ..... this is actually a true reciprocating feeder......where the pan extends out........the material drops off and the pan reciprocates back to load again and then we repeat the action?

As is the case in this business, sometimes our terms lead to misunderstanding til we talk some more.

The 45' long part is the kicker here....that is a long reciprocating feeder. Could you tell me the manufacturer brand please?

Can you get me a digital pic.......would be great. You can email it to me if easier on my listed email in my profile for review.

Appreciated. ■

Rob

The simplest solution to your problem is to design a feeder that can replace the old one - will have the same outline and supports. It should not be a problem for any screen manufacturer. If you have any problems let me know and I can help you with design.

regards

Ziggy ■

Rob

There are some articles about design and internal manuals (eg Allis Chalmers). Feeders are relatively rigid so that would make the design much simpler than the screen but even though i always use FEA to determine the static stresses and natural frequencies. Springs you can calculate or give the loads to the spring supplier and he will do it for you - you should check static, dynamic and transient loads.

Regards

Ziggy Gregory ■