Re: Boom Balancing In Stacker & Reclaimer
Monitoring cylinder & anulus pressure seems to be the only safe bet. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Boom Balancing In Stacker & Reclaimer
See second last page for complete machine check:
http://www.hatch.ca/Engineering/Stru...News%20003.PDF
Regards,
Lyle ■
Boom Balancing
please give reply in detail ■
Re: Boom Balancing In Stacker & Reclaimer
Force=Pressure x area. Gauges each side of each piston will indicate the out of balance. It's not rocket science; is it? ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Boom Balancing In Stacker & Reclaimer
Thanks for your reply,
If boom is connected to two cylinder both will show same pressure reading and not different .....
i hav one reclaimer with single cylinder how to balanc it ....
what i undrstood from you is that add counter weight and cross check the weight with pressure... is it so?
Regards,
G. Kiruba sankar ■
Re: Boom Balancing In Stacker & Reclaimer
Cross check pressure & weight is quite correct.
If you have 2 cylinders do not assume that they are identical & even if they are; still do not trust they are both full all the time.
If you can manage it, safely, check the pressures throughout the luffing range when you are near your desired balance condition. Then you will be able to check the effects of boom inclination on your structure. eg when the boom is up a bucket wheel imposes some compressive downloads whereas when luffed the other way the bucket wheel is stretching things. Your degree of balance might affect the localised stresses at the cylinder anchorages. You'll be OK because you know what the job entails. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Boom Balancing In Stacker/Reclaimer
Dear Sir,
Boom of slewing stacker/Reclaimer is balanced with the counter weight along with pylon & restoring arm. But in bascule design we can avboid pylon & arm.
It has to be calculated first & then it is adjusted .
For calculation we have to equate turning moment by boom with restoring moment produce by counter weight. All loads have to be taken care of during calculation.
Regards.
A.Banerjee ■
Boom Balancing In Stacker & Reclaimer
Dear Mr. Johngateley,
If we want to balance with the help of luffing cylinder only, then diameter of the same will be 2500 mm ( for a typical case done by me) .....too big. So to reduce the diameter we have to use counter weight.In all machine I have seen counter weight.
Regards.
Atanu Banerjee ■
Re: Boom Balancing In Stacker & Reclaimer
You don't understand the situation, do you lad?
A LUFFING CYLINDER L U F F S. COUNTERWEIGHTS B A L A N C E. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Boom Balancing
Dear Mr. Gateley,
In order to reduce push/pull force you must have counter weight arrangement. You are correct that it is not balancing the boom . But when the question of balancing comes we must have counter weight. So the function of counter weight are.
1. To reduce the push/pull force for luffing.
2. To induce the restoring moment which is a must for balancing a boom.
Trust I am clear now.
Regards.
A.Banerjee ■
Boom Balancing
Further to my reply.
The thread starer has asked for boom balancing with counter weight.
Regards.
A.Banerjee ■
Balancing Procedure Using Luff Cylinders
Hi
I am desperatley seeking a procedure with regards the balancing of a stacker reclaimer using the luff cylinders as we attempted to check the 'out of balance' using the 'dead weight' method with load cells but the trestles used proved unsafe.
Can anyone help? ■
Luffing Cylinder Clevis Point
Dear Experts,
Can any one explain the, Effects of Changing the position of Luffing Cylinder clevis points. ( Specially in changing the Boom Clevis point keeping the Clevis at Slewing portal constant)
Regards,.
G.Kiruba Sankar. ■
Re: Boom Balancing In Stacker & Reclaimer
Pls look at the OEM manual - it shouyld be there under start up/commissioing
Typical concepts are
Boom level/horizontal - clean down of all spillage etc
Measure cylinder pressures - load side
Work out conterweight changes
The general idea is to have load on the cyclinder...if the cylinde fails > then the boom will fall/drop to the stockpile side and not the other way around
Cheers
JM ■
Consider U R At Site
Dear Experts,
Let me put my Question in different way,
Consider you are in site, You have erected Stacker with its Counter Weight box, Now you have to decide How much Counter weight to put (Concrete Blocks, Iron Bar, Iron Ore Pellets, or pouring Concrete in Counter weight Box). How to proceed with consider you are at site.
Thanks and regards,
G. Kiruba Sankar ■
Re: Boom Balancing In Stacker & Reclaimer
Sir,
There are other procedures to balance the M/C the most latest and accurate method is by Statimeter.
This Procedure is followed by many leading companies in India and abroad.
Balancing a Stacker Reclaimer by pressure adjusting in cylinders is a old and backdated method . By this process the M/C will be put into operation with too many unknown / hidden parameters which will lead to unexpected failures.
*During designing of M/C the pull / up lift of Boom strl .below the Boom Tie Link , at horizontal level should be calculated ,keeping into consideration the digging load at lower most bench as well as the additional up lift at top most luff angle with max wind load acting on it. Two no fabricated hook are to be welded below the Boom section in line to Tie Link and dispatched.
* After completion of all Erection activity site to furnish the actual weight of Luff Super Structure if any addition or deletion has been done as per site condition to Design Eng to re check the final pull.
* Once the pull (inMT.) is established and given to site they can go for the balancing activity as given below:
Place a dead load of 1.5 times of the pull below the boom structure hook; tie the dead load with the help of sling to a Statimeter and the other end of Stetimeter to the hook.
* Weigh each individual CWT ballast and put mark no.
The CWT should be caste such that the total weight of all CWT should be 10 to 15% less than the design weight.
Arrange the CWT in such a manner so that the weight difference between side A and side B is not more than 500Kgs.
* Complete all erection , pipe line & commission the Luff system without connecting the cylinders to mast super structure. Calibrate the luff Cylinders stroke length. Set the system to the design pressure / parameters before commencing the balancing activity.
*Start loading the CWT in the sequential manor as stated above. It is perfered that the maximum indivigual CWTs are placed nearer to the Tail Boom Links on either side.
Continue loading the CWTs till the Statimeter reading shows the pull load. Once the same is achieved stop loading and connect the Cylinders.
Regards,
A.N.Mukherjee ■
Re: Boom Balancing In Stacker & Reclaimer
Originally posted by A.N.Mukherjee
Sir,
There are other procedures to balance the M/C the most latest and accurate method is by Statimeter.
This Procedure is followed by many leading companies in India and abroad.
Balancing a Stacker Reclaimer by pressure adjusting in cylinders is a old and backdated method . ..................... Continue loading the CWTs till the Statimeter reading shows the pull load. Once the same is achieved stop loading and connect the Cylinders.
Regards,
A.N.Mukherjee
You forgot to mention that the commissioning engineer??? should be able to stop the boom luffing one way or t'other with his bare hands because there is nowt to stop it if the old and decrepid cylinders are not connected.
We might be old fashioned but we did try to be safe! ■
In Reply To Mr Loui Span Jang
Originally posted by louispanjang
You forgot to mention that the commissioning engineer??? should be able to stop the boom luffing one way or t'other with his bare hands because there is nowt to stop it if the old and decrepid cylinders are not connected.
We might be old fashioned but we did try to be safe!
Dear Mr Loui Span Jang
If I have under stood correctly, In Mr. Kirubasankar forum- Boom Balancing in Stacker & Reclaimer
He wanted to know the other procedures to balance the Luff Super Structure. which I have tried to explain.
In his quote on where it is stated that the said M/C is old and used. so where on earth did you get that “OLD
AND DECREPID CYLINDERS” and why should the commissioning eng. Should have to stop the boom. Pl. go through
my part where I have mentioned the boom will be tied down to a load 1.5 times more than the total M/C CWT .
So your statement is irrelevant. And hence forth pl note that I participate or venture in what I know about. And do not
take the Forum as a pass time.
No hard feelings it is purely business.
Kind Regards,
A.N.Mukherjee ■
Boom Balancing in Stacker & Reclaimer
How a Boom in Stacker as well as in Reclaimer is Balanced
(How counter weight is added)..
Whether counter weight is calculated approximately & by trial and error balancing is done by adding counter weight in site.
One method known to me is monitoring Cylinder pressure while adding counter weight.. is there any other method to do balancing...... normally how boom is balanced. ■