EOT cranes
are widely using now-these days in steel industries for transporting the
materials from one location to another.
We will
consider the wheel of Electric overhead crane
Electric overhead traveling crane is used to transfer the goods in workshop or
in any engineering organization; it uses no. of wheel that runs over the rail
track. As per the capacity and span of crane manufacturer will decide the no.
of wheel should be used for that crane.
Function of Wheel
The main
purpose of wheel is to move over the rail track and provide the ability to
crane to move from one location to another with rated load.
EOT
crane long travel wheel
Rail
tracks are made of High Manganese steel that will be very hard material, hence
we have to select the material for our wheel that will have  slightly
lower  hardness as compared to rail track because if there will be
any misalignment between the erection of crane wheel then it’s collar will
touch the rail track and wearied out rapidly.
So in
order to design the wheel we select the material like EN-9 or EN-8 that have
hardness around 300 BHN and as rail track hardness will be around 350 to 380
BHN.
In EOT
crane wheel, there will be collar on both side of wheel and the width of this
collar will be around 20 to 25 mm depends on the diameter of wheel.
Crane Wheel specification
There are
some important technical specifications of long travel wheel for electric
overhead travelling crane (same for cross travel wheel also)
Root
diameter
Collar
width
Bearing
used
Material
selection
Process
selection
For our safety purpose we used to provide hardness about 340 BHN up to 20 mm deep in
root diameter of wheel.
As wheel
runs over the rail track so in order to avoid the rapid wearing of its diameter
this hardness is provided.
Required properties for this product
There are
some specific and necessary properties of crane wheel that we have to mention
during purchasing the desired quality crane wheel
1.    Material
EN- 8 or EN-9
2.    Hardness
250-300 BHN
3.    Surface
finishing should be good
4.    Root
diameter hardness should be 350 BHN up to 25 mm deep
5.    Collar
width should be 20 to 25 mm both side
6.    Wheel
shaft forged should be made of 300 BHN
7.    There
should not be any clearance between shaft and wheel
8.    Self
alignment roller bearing should be used
9.    Bearing
housing (both side) made of simple mild steel
10. Self
lubrication & good strength
Processing method
Normally
all manufacturer uses forging process to manufacturer the wheel for crane,
there is some advantage of this process
1.    Good
flexibility in design
2.    It
provides better strength
3.    Processing
time is also short
Possible limitations
There are some limitations during the design of the crane wheel and these are as follows
1. Wheel
material should be hard but not more than the hardness of rail track as due to
wearing action rail track got damage if it has less hardness as compared to
wheel and it is easy to replace the crane wheel as compared to replacement of
track.
2. Root-width
should be at least 30 mm more than the width of rail track, as during the
operation there will be shifting in diagonal direction.
3. Root
diameter selection depends on the capacity of crane, more capacity crane
requires larger diameter of wheel.
4. Shaft
diameter is also depend on the capacity of crane.
Steps to minimize the cost
In order
to minimize the cost material selection is very important, some manufacturer
uses EN-24 but it is too much costly and much hard but that much hardness is
not required for crane wheel.
Processing
method also play crucial role in crane wheel, the best method to process the
crane wheel is forging process as this will develop and provide the better
strength to wheel in less time.
Your
suggestions are required for amending the quality, please suggest so that we
may develop a single platform for all Mechanical engineering topics.
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