Electrical Engineering/Crane Construction.


Crane Design
Crane Design  
QUESTION: Dear Cleggsan


Cranes are designed to lift and move specific loads capacity in tons. What are the input parameters in terms of mechanical, electronic, electrical components considered for Crane Construction
in terms of its ability to lift more loads ?

i.e. Electrical Power, Pulleys, Shafts, Ropes, Levers, Crane Height etc.

Example :

Some Cranes can lift a load of 100 ton, while some cranes can lift say a load of 500 ton. So in the second case, what are the parameters considered for designing the crane which can lift more loads.

Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

ANSWER: You surely ask a difficult question.

As you suspected the parameters must all be taken into consideration when increasing the lift size from 100 ton to 500 ton.

Basic considerations in my view would be:
- Length of arm - which is a design criteria based on what the in-field application requires for reach.
- The weight distribution of the stationery vehicle such that it can stay anchored to earth when the maximum load capacity is reached under the worst case arm position.
- The strength of the arm during the maximum load lift.
- The motor horsepower required.
- The number of pulleys and lift speed.  Adding a pulley, for example, will cause a greater lift capacity but will be slower and the length of the cable is greater.
- Shaft and pinion axle must be strengthened for increase of load.
- The angle of the vehicle earth platform; some terrain does not allow the crane vehicle to remain perfectly parallel to earth thereby requiring some adjustable mounts.

In a crane which remains the same in every respect but just increased load the factors would be arm strength, electric motor power, cable strength, vehicle platform to handle increased earth stability.

Hope this gives you ideas for your project.

---------- FOLLOW-UP ----------

Hydraulic Cylinder
Hydraulic Cylinder  

Hydraulic Cylinder
Hydraulic Cylinder  
QUESTION: Dear Cleggsan

Thank you.


Hydraulic Cylinder Design could be one of the important factors for lifting more load in Crane Construction ?

Awaiting your reply,

Thanks & Regards,
Prashant S Akerkar

Of course.  Where a hydraulic piston is used to operate the various parts it must be greatly increased in capacity in order to be able to handle greater loads.  A hydraulic piston is a form of leverage amplifier and can give great pressure to move the piston in and out of the shaft.  However, it still requires greater input power to provide increase load capability.



All the best.  

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