Dear Mr.Keshav,

Could you please explain with a drawing ?

Regards, ■

Well.....first we start off typically with a single shaft 2 bearing inclined circle throw screen....which would basically have X "calculated B10 bearing life". BUT, if we get to real big screens...say 8x24 3 deck range, lots of vibrating weight, maybe...RUBBER 12"X12" SQUARE PANELS on the top, maybe second deck also, then wirecloth on bottom for example. We would contemplate normally going to a DUAL SHAFT DRIVE. This nicely recalculates the B10 BEARING life span to acceptable hours, in excess of 10,000-20,000 operating hours vs A single shaft ....struggling to handle those loads.

one motor or two....we can run each shaft separately, say 2.....30hp motors running on each shaft OR....one 60 hp motor to run both shafts with a SYNCRO BELT....

PROS & CONS: one big motor vs 2 motors....easy to start, but lose the motor ....lose all power. Two 30hp motors HARDER to time together but, really not a prob...it is done all the time. Customer preference prevails here generally. ■

ON AN inclined screen, use dual shafts normally as a function of needing to increase the B10 OR L10 BEARING life to an example manufacturing standard. Common on bigger screens, say installed at 20 deg inclined angle.

The 2 shaft are run with drive belts to 2 single motors, say 30hp on a 8x20 3 deck screen with a COGGED TIMING BELT on the opposite side. NO GEARS like a feeder.

yes, ON A BRUTE force pan and/or grizzly feeder it would be 2 shafts geared together, each shaft running opposite directions to affect a EPLITICAL THROW at typically 45 angle...which would give us forward movement and stratification of the materials. The timing angle is important and critical for PROPER MATERIAL MOVEMENT .

george baker

moderator ■

Originally Posted by keshav

Dear Mr. Baker,

I thank you for your reply.

Is it possible to synchronize the two shaft assemblies in such a way that the vibrating screen can be used as a horizontal vibrating screen?

I have read that if the two shafts are rotated in opposite directions, an elliptical motion results. Can the same effect be achieved using two separate shaft assemblies? (i.e. without using a geared twin shaft assembly)

Keshav

You can the screen in horizontal position either by using timing belt, control phases of your motors electronically or rotating them in the same direction - circular motion or to be more precise elliptical ( it is a function of position of the centre of gravity and unbalanced mechanism. There are some conditions to get the mechanisms self-synchronised and then you can run without timing belts.

Regards

Ziggy Gregory ■