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Simple solution to prevent load swinging in overhead crane Answered

Cranes are used to move loads from one location to another in minimum time such that the load reaches its destination without swinging. As we all know, that swinging problem occurs due to flexibility of wires but if the wire is rigid and permanently fixed on one side then ???As per the sketch there will be a telescopic arm and one side of the arm will be attached with the trolley of the crane. This rigid telescopic arm will be connected with the load at the time of lifting the load. In this way there will be no problem of swinging as the rigid telescopic arm will be fixed with the trolley and wires will work to lift the load so there is no chance of swinging of load.My solution can achieve these following points at the time of construction.Improved Safety High-Precision Moves Increased ProductivityEasily Implemented on Existing tech Save time Save energy to reduce carbon Cost as the crane can work at the time of high speed air. My solution is simple, low cost and very effective to prevent load swinging problem.

Discussions

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Downunder35m
Downunder35m

2 months ago

If you check the ratings on these cranes then you quickly realise one thing: The arm is not designed to take any twisting forces.
Your idea totally neglects physics here and also the main problem of swinging loads: wind and turning the crane.
The additional weight of you dampener would also reduce the load rating of the crane to something useless for construction work.

You only consider only one direction of movement while on a real crane there is a lot more.

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vikram_gupta11
vikram_gupta11

Reply 2 months ago

The arm is not violating any physics law as it will work to dampen the twisting forces at initial point.
Second we can increase the capacity of motor as per weight of arm.
Third, once load has been lifted upto required height then turning of crane is no more important.
Basically it is designed for overhead cranes.

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Downunder35m
Downunder35m

Reply 2 months ago

Did you ever bother to show your idea to a crane operator? ;)
Or watched a few of these cranes on a slightly windy and busy day?
Waste the 20 bucks and get a kids toy crane that goes about 1.2m heigh.
Add you attachments and improvements and check what differs from your great theory to the often not so great reality.
Once done playing come back and we have a real talk about why this stuff was overlooked by every crane builder and operator out there....

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vikram_gupta11
vikram_gupta11

Reply 8 weeks ago

I, myself have done some work on it.
You are forgetting about shock absorbers to prevent the arm from damaging in wind and busy conditions.
Also consider the overhead crane as it is designed for overhead cranes upto the height of 20 foot.

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instructodad_
instructodad_

2 months ago

I’m no expert- but here are some of my first thoughts on this:

If you get a heavy load moving, you have to dissipate it’s kinetic energy somehow to stop it. The load swings not because the cables are flexible, but because the load keeps moving after the trolly has stopped due to its (the load’s) inertia. Unless the telescoping rod is infinitely rigid, it will deform/flex like a fishing pole to absorb the energy of the moving load. (And then it will swing back with the load as the energy stored as bending turns to motion again). How much deformation will depend on the rod design.

It seems like properly designed, this could work well for less massive loads on shorter cranes. As the crane height gets high or the load gets large, that telescoping member would need to be very stiff. Either that or come up with another way to dampen/absorb the energy.

Incorporating active systems that can respond to the natural frequencies of the system or adjust the speed profile of the trolly could also help speed up the process.

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vikram_gupta11
vikram_gupta11

Reply 2 months ago

I already have mentioned that use of shock absorbers will work to prevent the arm from damaging.
Yes, it will work well only in overhead crane for height of upto 20 foot.
The load will be not swing as it will be attached with the telescopic arm with a lock system at initial point.

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vikram_gupta11
vikram_gupta11

2 months ago

I would like to tell that shock absorbers will work to prevent the arm from damaging.