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Effect Of C.g In Vibrating Screen
Sheev,
For circular motion screens the mechanism should be located as near as possible along a vertical line passing through the C of G of the screen.
The result of moving the mechanism horizontally from this line will result in an increased and more vertical motion at the end towards which it his been shifted, and a decreased and flatter motion at the other end. In practice the horizontal location does not have to be exact, but within say 1% of the screen length should be aimed for.
It is usually more difficult to locate the mechanism on the C of G in the vertical axis (especially on 3 deck screens). The result of positioning the mechanism above the C of G will be that the circular vibrating pattern develops into ovals towards the ends of the screen, with the axis pointing downhill at the feed end (speeding material up), and uphill at the discharge end (slowing material down). Locating the mechanism below the C of G will reverse the direction of the axis to point uphill at the feed end and downhill at the discharge. However in terms of screening performance, the vertical location of the mechanism above or below the Cof G (within normal limits) will have little effect. ■
Centre Of Gravity
John.........great answer. covers the theory nicely.
sometimes people will install the shaft 12 inches closer to the FEED END of the box VS dead centre.........this is usually done to give the FEED END OF THE MACHINE a little BIGGER CIRCLE to compensate for a LOW ANGLE of INSTALLATION.
This is no problem and done fairly frequently especially on portable screens where the headroom must be kept low for highway travel.
GEORGE BAKER ■
Untitled
HELLO
"GREETINGS" FROM SHEEV
JOHN & GOERGE,
"THANK YOU VERY MUCH FOR YOUR SUGGESION"
I STARTED MY DESIGN CALCULATIONS ON 2000X6000 MM VIBRATING SCREEN.
I AM FINDING LITTILE DIFFICULT TO DEFINE THE SIZE OF THE BOLT TO BEARING HOUSING PAD PLATE
(BEARING IS 22324 J A W33 VA405 - SKF MAKE SPHERICAL ROLLER BRG)
RIGHT NOW I AM GOING WITH M22,16 NOS FOR THE 10000KG CENTRIFUGAL FORCE WITH 30 HP MOTOR
IS THERE ANY OTHER WAY TO GET EXACT CALCULATIONS PLEASE SUGGEST ME
I JUST STARTED IN THIS FIELD BECAUSE I HAVE ALL THESE DOUBTS PLEASE DONT MINE TO SUGGEST...
PLEASE MENTION IF ANY BOOKS OR MAGAZINES AVAILABLE ON THESE SCREENS ■
Re: Effect Of C.g In Vibrating Screen
Sheen,
The selection of bearing housing bolts is by general engineering calculations as described in most design textbooks. Also most reputable bolt manufacturers publish informative literature on design of bolted joints.
For such an important connection I would use be using High Strength Structural bolts (Property Class 8.8).
For a bearing housing 22324, my gut feel is that your 16 – M22 bolts (per housing) would be very very conservative, and most likely even 16 – M20 bolts would still be more than adequate. However do the sums to confirm. ■
Re: Effect Of C.g In Vibrating Screen
JOHN
THANK YOU FOR YOUR VALID JUSTIFICATION
YOURS ■
Incline Screen Tips
DID YOU KNOW?
1. SLOPE can range from 10 degree on low side to 35 degrees on high side
2. Foot travel rate: 75ft/min on average at 20 degrees
3. 75% of undersize passes in the first 25% of the screen length
4. Keep BED DEPTH to a MAXIMUM of 4 times the screen cloth opening size. IF It exceeds this, GO TO NEXT LARGER SCREEN DECK SIZE to maintain EFFICIENT SCREENING.......95%
3 times is even more conservative if want to be real safe in your sizing calculations.
REGARDS
George Baker - MODERATOR ■
Re: Effect Of C.g In Vibrating Screen
GEORGE
YES I KNOW INFACT I AM OBSERVING ALL THESE ON MY EQUIPMENT (2000X5000) WHICH IS COMPLETED WE ARE FOLLOWING ALL THE POINTS WHAT YOU LISTED
RIGHT NOW MY INCLINATION IS 18 DEGREE FOR 2000X6000
CAN I EXPECT SOME DESIGN STEPS FROM YOUR SIDE TO MAKE STANDARD SCREEN OF ANY SIZE
BECAUSE I AM PLANNING TO RELATE THE SCREENS IN PRO-E FAMILY TABLES OF COURSE IT TAKES TIME BUT I AM PLANNING TO GO WITH THIS, IN THIS PROCESS PLEASE GUIDE ME
OR SUGGEST ME THE BOOKS AND AUTHORS I WILL BE VERY THANKFULL TO YOU
WITH SMILE ■
Where You Would Order Books
Screens In The Making :^)
Greetings from the "Frozen Eastern wilderness",
You will save your self a lot of trouble and down time and reduce the tools needed by using "grade 8 "Allen Head" national fine thread capscrews with drilled heads to accept wire to wire pairs of boltheads together and reduce the possibility of loosening bolts-do not hesitate to spec red or blue loctite for the installation on threads. ■
Drilled Bolt Heads And Wiring Excellent
Izaharus: Your comments are very very true in real life. Drilled bolt heads wired together is excellent design safety feature.
Locktite is excellent and recommended use.
FINE THREAD hardware is more expensive but, much better, tighter hardware than COARSE thread. In the good ole days,,,,fine thread and REAM TIGHT HOLES on vibrating screen bodies was the norm.
WHY? WE WANT all the parts to run "together" as one as much as possible.........the more this is true........the less breakage. It is when bolts loosen off, that parts start to CRACK.....etc.
HYGIENE is extremely important when reassembling vibrating screen bearing in the field. We used to carry the BIG BEARINGS inside a green garbage bag until ready to put in the housing. Most people kinda let the AIRBORNE dust get all over the new bearings and suffer early failure because of this.
KEEP shakin out there.................George Baker MODERATOR ■
Thanks For Suggesting Bolting Arrangement
HELLO GEORGE, JOHN AND IZAHARIS
THANK YOU VERY MUCH FOR YOUR SUGGESION I FOLLOWED THE FINE THREAD WITH LOCKTIGHT
SCREEN ( 2.0X6.0m)IS READY AND ITS PERFORMING ABSOLUTELY FINE AND IT IS NOW IN OUR STANDARDS LIST
THANKS TO FORUM FOR SUPPORTING ME
WITH WARM REGARDS ■
Appreciated
SHEEV, Bevcon India
Glad we all could help you on this particular item. As always we love to hear back from our forum partners and especially with your kind words of appreciation. Thankyou.
Makes it all more interesting and fun.
Keep Posting............with Best Regards, George Baker ■
Effect of C.G in Vibrating screen
Hai
"Seasonal Greetings" from sheev
I just started as a designer in material handling systems earlier i was in trining field(softwares like AutoCAD,PROE,UG...etc)
My problem here is how C.G (Center of Gravity) effects functioning of circuler motion vibrating screen (2.0x6.0Meter). if calculated C.G is wrong then what is the solution.
How to justify the calculated C.G is correct is there any standerd calculations available???
If any one can suggest me please ■