Re: Balancing Of Stacker Boom
Dear Mr.Shaiju,
Hope the following thread may be interesting to you.
https://forum.bulk-online.com/showth...ight=balancing
Regards, ■
A New Boom Sweeps Clean.
The thread referenced is confusing. Some clever instrument is alleged to measure out of balance. The point of the exercise is to limit the net luffing force and thereby reduce the imposed loads on the structures involved. This done by incrementally locking the cylinder, under closed centres, and measuring the pressure diference. Throughout the referenced thread there is lamentable misrepresention of hydraulics.
When it comes to BWR's the balance is complicated by the bearings mounting the bucket wheel. If the wheel hits a pile so that the bucket wheel becomes detached then no amount of balancing will be sufficient to stop the machine upluffing to alarming heights and in worst case scenario, toppling the gaget over onto the opposite pile.
However, according to the machine represented in your recent sketch, none of this need concern you since you are concerned with a rope hoisted twin boom stacker. All you should be concerned about is eliminating slack rope from the latching. ■
Re: Balancing Of Stacker Boom
Originally Posted by louispanjang
When it comes to BWR's the balance is complicated by the bearings mounting the bucket wheel. If the wheel hits a pile so that the bucket wheel becomes detached then no amount of balancing will be sufficient to stop the machine upluffing to alarming heights and in worst case scenario, toppling the gaget over onto the opposite pile.
However, according to the machine represented in your recent sketch, none of this need concern you since you are concerned with a rope hoisted twin boom stacker. All you should be concerned about is eliminating slack rope from the latching.
Thank you Mr.louispanjang
Here I am concerned about slew &Luffing stacker not Twin Boom stacker.
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Re: Balancing Of Stacker Boom
Originally Posted by sganeshHope the following thread may be interesting to you.
https://forum.bulk-online.com/showth...ight=balancing
Regards,
Thank You Mr.sgnesh
I have referred the link. Kindly help me how to calculate the Pull Load (ie.to compare Statimeter reading) as method suggested by Mr.A.N mukarjee
by
SHAIJU
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What Is What And To Which End
Dear Mr. Shaiju,
the question / request is scarcely informative to say the least... But if read in a way that there could be a stacker with balancing to be done and people around it wait for some salvation from ...the internet? Even if my guess is wrong on that one i'd like to forward m.o. nonetheless:
Pls. kindly fit out your question(s) with more, read sufficient, information and give a clear information on the status of your involvement too.
If the following is not of interest to you, pls. simply skip it.
Commissioning of mobile machines and definition of balancing (even if only slack rope elimination) is a task for knowledgable qualified & trained people of the professional status "engineer" with a valid statical calculation & mechanical design drawing of the application in their hand. If there's a reeving system, rope force sensors must give their precalculated readings, if there's balancing on hydrocylinders, pressure readouts / load cells must give their precalculated values on all design positions and operational situations.
Regards
R.
Even after thinking it over once again i shall stand to the point that such procedure as described above and given in the link should not be taken from the internet or even a specific forum, but only from qualified & experienced staff with the actual design and calculations and physical parts as the factual cylinders and structure on their hand or in their view. i personally feel it to be outside limits to take a balancing procedure, just a description in some sentences and apply it. Yes, that may seem overcautious and also might be not adequate to a tight schedule on site. Sorry for loading down so much words here.
One technical point is to be added at last: Proposed procedure is statical, and relies on precalculated force values. Pls. try to see the point "reliability" if doing so after design stage is over. However as after statically balancing the boom the cylinders must be connected, their respective settings / physical properties have to be considered, as Mr. Louispanjang pointed out. It is not over when statical balance of the boom is done!
In the end #1: i cannot even guess whether it is a single or double cylinder setup or whether the cylinder is on the boom side (pressed link design) or on the outside (pulled link design).
In the end #2: it is now three month or so that i saw a main structural part coming down from crane's hook because the "sling" broke. Well, it said to take a "sling", didn't it, and they took a "sling". So much for detail. ■
Re: Balancing Of Stacker Boom
Hello,
The query is about stacker balancing. So here is some general information pertaining to the subject.
The stacker (for bulk materials) can have few variants as below:
- Single boom stacker without slewing and luffing. Also called tripper with wing conveyor, when it is small. This would require balancing.
- Twin boom stacker without slewing and luffing or only with luffing. Also called tripper with two wing conveyors when same are small. This is inherently in balanced state.
- Stacker with luffing boom but without slewing. This requires balancing, but its balancing and stability calculations are less complex.
- Stacker with luffing and slewing boom. This requires balancing. Its balancing and particularly stability calculations are quite complex, because these have to cover varied positions of boom arising due to large number of combinations of luffing and slewing angles.
The imbalance mostly arises by cantilever conveyor boom. To counter this off balance, only method is to have counterweight boom directly opposite (at 180 degree) to conveyor boom. The moment due to counterweight boom will be equal and opposite to the tilting moment created by conveyor boom. Obviously if the counterweight boom is short, it will need bigger counterweight. Conversely longer boom will have lesser counterweight.
The nice balancing and stability can be easily achieved for stationary situation of the machine, but it gets disturbed and adjusted during calculation process. The balancing and stability is to be also checked for wind / no wind, wind in any direction, travel acceleration inertial forces toppling effect, travel deceleration inertial forces toppling effect, boom slewing acceleration inertial forces, etc. The machine should remain stable by good margin in all the aforesaid situations. The stability margin is in context of the limitation of wheel support system or slewing ring (if it is in machine), whichever is less. The above ultimately results into varied value of stability during operational status and compromise decision is made to suit all.
The stacker constructional features including balancing, to achieve above, is the job of regular designer of such machines.
Regards,
Ishwar G. Mulani
Author of Book : Engineering Science And Application Design For Belt Conveyors (new print November, 2012)
Author of Book : Belt Feeder Design And Hopper Bin Silo
Advisor / Consultant for Bulk Material Handling System & Issues.
Pune, India.
Tel.: 0091 (0)20 25871916
Email: conveyor.ishwar.mulani@gmail.com
Website: www.conveyor.ishwarmulani.com ■
Balancing of Stacker Boom
Can any one suggest the best method to Balancing of Stacker boom
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