3/4 Undercarriage support machine on an offset yard conveyor

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In the article titled ‘Undercarriage support structure’ we have discussed that we have to provide a 3/3 undercarriage support for the machine which is operating on an offset yard conveyor. Now the question is, "is it possible to provide a 3/4 undercarriage support instead of a 3/3 undercarriage support for a machine which is operating on an offset yard conveyor"?
The answer is ‘YES’.

Design a Bucket Wheel Stacker cum Reclaimer machine with a 3/4 undercarriage support which is working on a conveyor which is offset with the axis of the machine.


 SOLUTION:
By providing a 3/4 undercarriage support we will face the following problems,
1. Feeding the material to the yard conveyor during reclaiming operation.
2. Feeding the material to the boom conveyor during stacking operation.
3. Feeding the material to the intermediate conveyor during stacking operation.

Let us discuss the solution in 3 parts.
a. Undercarriage WITH inclined chute.
b. Intermediate conveyor WITH a tilt.
c. Tripper

Undercarriage
Below figure shows a 3/4 undercarriage support on an offset yard conveyor.

An inclined chute (refer the below sketch) with proper valley angle feeds the material from the boom conveyor to the yard conveyor during reclaiming operation.


Intermediate conveyor
Since the axis of the machine is offset with the feeding conveyor now the challenge is to feed the material to the boom conveyor of the machine during the stacking operation. To solve this, a ‘tilted’ intermediate conveyor is provided (refer below sketches).


Tripper
To feed the intermediate conveyor, a tripper is provided (refer the below sketch) at the receiving point of the intermediate conveyor.

(As per the system requirement, if necessary a bypass arrangement shall be provided at the discharge point of the tripper)


GUARANTEE POWER:
Compared to the machine with a standard tripper, the guarantee power of this machine (during stacking mode) is slightly more due to additional intermediate conveyor drive. But the overall running cost of the plant shall be the same due to the reduction in yard conveyor lift (@ tripper) and this results in the reduction of yard conveyor drive motor rating.


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