how to size and design a balance sheet

[odisseo 18]

If it were possible to measure and design a crane lifting balance, which forces are solicited, such as critical points, which type of profile should be built and conceive, such as the best configuration.
size 3 meters flow 4 ton
size piece to lift 4 meters long 90 cm wide h 1,20 weight 3 ton

 

[meccanicamg]

definitely with eurocode 3 uni en iso 1993-1-8 welding and bolting and structures. then there are the standards of the lifting sector.

you have to apply the forces to the two hooks and the reaction to the central hook. check the beam and cut down. the profile is chosen and occurs later. welds all occur taxally.
stress, maximum deformations and welds and/or bolts where crickets or hooks are inserted.

at the end is a science work of complete constructions, a little like all structures.
then it can occur further and locally with finite element analysis.

I would say that then it must be certified by a qualified special body. Don't joke about these things where you can even die.

If you have to do an exercise we can look at it....if you really have to build it, it is better to buy it with the printed and guaranteed ce.

 

[meccanicamg]

at the moment I do not have the calculation file available, but in the far 2010 had or made a balance of 5 tons so

the structure has been optimized as geometry to have maximum resistance in the most stressed ones.
as you can see from the photo, you have a main sheet cut with welded reinforcements in the grille area and lower horizontal plate to stiffen the whole.
if it had been in tubular it would have been more stressed in the areas of the welds of the hooks.
as always we evaluate the needs and the possibility of optimizing.

 

[odisseo 18]

thanks for your just advice maybe if it were possible I would like to achieve it theoretically, as exercise
how would you conceive, taking into account that the piece to lift was unbalanced on one side?

 

[meccanicamg]

If you know the center of the lathe, see that it is moved on the left side. the two different distances horizontally define the load percentage on the respective Gulfs inversely proportional to the distances. example if from golfing left to the baricentro there is 1000 mm and from the baricentro to the golfing dx there is 2000 means that the golfers of sx carry double the weight of those of dx.

 

[odisseo 18]

I practically measured from spindle to counterpoint is 200 cm exact, the problem is not the lathe, but an external x rectification, allego sschizzo, has a trapezzoidal isoscele plant and the weight is unbalanced where the head is housed with the mola and the hydraulic transmission I attach you sketch with measures, once I conceive it, realize it x lift the lathe and also
the lathe in the upper corners of the head has in a sontrap way like two bits or 2 pulleys, in which the rod of the lifting rope is housed, while on the side of the bench there are 2 holes passing in which I should put a full round bar of steel from 50 mm to whose extremes to thread the gasses of the ropes or the strops, in the grinding bar there are 4 holes opposite in the bench

 

[meccanicamg]

ahhh see then you want to build a dangerous lifting tool without c!!! ! !

However, at your own risk, this is clear. having long cast iron bases it is good not to stress them to bending because the lower part of traction does not hold. so you have a serious intermediate anchor points.
you have to evaluate the distribution of the load on your balance sheet.
of course your ropes will tire in two directions at the end it will go that you take a nice tube 300x500 thickness 12.5 and you will counter it with a dish.
Remember that if you don't sew it after welding you may have trouble of fatigued sealing nature because there are a lot of tensions of welds.
I repeat that if you want to build it you must be competent really, otherwise forget it.

 

[odisseo 18]

the problem of rectification is not the front desk but the peninsula that housing the motor and the grinding wheel with the hydraulic transmission system, for the lathe I think it is sufficient the strops and a couple of steel bars to be threaded in the appropriate holes, while x the rectification the matter is more osticate I should thread 2 steel bars have u robust ropes more a rope to hook the peninsula and balance the load to the ascent, I explain

 

[essebi]

There is a specific harmonic standard, en 13155 for the structural calculation of lifting accessories.

 

[odisseo 18]

thanks for the right suggestions, I will treasure, I have thought to use or a he 400 series reinforced m or a ipe from 360, or two beams to u joined on the side of the height reinforced with handkerchiefs and plates, my problem is that the balance serves me to reduce the height of the harness and make it + near possible to the hook of the crane, the machines are in a low environment h about 4,70m,

 

[meccanicamg]

when you put the machine tools in the shed the first time how did you do it?
Don't you want to use the tanks to the front door so you can load outdoors?

 

[odisseo 18]

I have not installed the machines, however to hear say, they have used muscles oil of elbow round rods type curves and palanchino levers, they have tried with 35 qli mule, but it has arisen from behind has basculato on the axle front, in the road the door of access is small about 4 meters, I can not place 2 cars for reasons of clump , so to have less encumbra

 

[meccanicamg]

It seems a game of prestige to move these two machines. Surely you have to move one at a time.
the barbeque allows you with a big crane hook to lift a anchored structure with multiple chains and the thing goes well. Of course, the chains are shorter and well distributed.
You must surely find the smartest system to take away the machines and I don't know if the self you think you use is in the shed and if you take a little I don't know if you've brought enough with the arm that it has.
once I saw a low shed with so many work centers under two meters from the road. this has the arched roof that opens and vien away to remove and put machine tools....roba de mat.

 

[odisseo 18]

thanks for the suggestion follow your advice, I keep you updated
http://www.achats-industriels.com/modules/prestapress/content.php?id=15http://www.ilsa.be/pdf/nl/constructies/hefbalken_nl.pdf