Wire Rope excavator/cranes

8/14/2019 Wire Rope excavator/cranes

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Title:

CREATED BY:

. ,

TIRUPATHI, INDIA.


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This is a practical problem the main

o ec ve o w c s o rep ace e presen ay y rau c

operated excavator or JCB with Wire rope operation in orderto minimize the hydraulic network. This system may also prove

to be simple rather than a complex and cumbersome design as

usually observed in the hydraulic operated machines.


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Introduction:

To perform a given work using an Excavator Hydraulic

systems were used. The present day excavator has the following

characteristics- The hydraulic system incorporates complex arrangements for

pressurizing the fluid.

It uses Diesel Engine (6 or 12 cylinders type ) which consumes lot of

fuel.

The engine structure and design are complex.

The present day engine need also to be eco friendly and

so we look far ward for a better system which minimize the draw backs.

The present idea may help in this regard


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hydraulic systems which include cylinders, ram, valves, fluid.


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Figure shows the basic arrangement of the wire rope arrangement

Black lines Wire arran ement for first arm

Rose lines Wire arrangement for second arm


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hoist machines. The rope drum is supposed to be arranged inside the body

operator sits. The bucket movement may be obtained by the regular

.

cannot handle the work in such locations.

eas y:

This is to verify whether the use of ropes are feasible or not.

That is whether the ropes are capable of handling the large loads.

Consider the following examples -


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xamp es:

Example1 Dam with gate Example2 Cranes


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Mechanism for the first arm:


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Mechanism for the second arm:


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Difficulties:The difficulties that may arouse when the rope mechanism

acts on only one side can be understood from the following figures

Difficulty 1 Difficulty 2Yellow actual osition

Grey deflected position


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Difficulty 3Y ll t l itiellow actual positionGrey - deflected position

In order to eliminate the difficulties (as shown above) that

may arouse w en e ropes ac s on on y one s e, we emp oy a ou eside acting mechanism which may work effectively.


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Operation:The basic operation that is involved in this type of

mechanism can be understood from the figures

(Movement of arm to which (movement of arm to which first


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Essential Requirements: The mechanism should not cause any miss function, for this

purpose it is necessary to employ double side acting mechanism.

Whatever the amount of rope wound on one side, the same amount of

rope should be unwound (released) on the other side. It means the

length of the rope on both sides should undergo equal changes when in

operation.

This is the one most essential condition to be satisfied by the

proposed mechanism. Else stresses may develop and also the possibility

of wire breaking occurs along with miss function.


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Figureigureunequal changes in length.

D i C id tiesign Considerations:1. Pins that are used to connect ropes with the arms should be designed

to withstand the large loads without being stressed.

2.The rope should have the capacity to carry the maximum load carried

by the machine.


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3. The pulleys are supposed to offer less friction

4. The proposed mechanism should use less power to handle a given

task, than that consumed by a similar sized Hyd. Operated machine.

Use of motors:

Factors like difficulty in the availability of diesel, gases

that are released during combustion, cost etc. makes us to look for a

better fuel (alternate fuel) or if possible a motor. It can be easily

verified that a diesel engine consumes more input to develop a given

rated power than that consumed by an electric motor. Cost incurred is

also low. But what required in this case is the ability to store large

amounts of power and also to discharge it whenever required.


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Bucket motion:The bucket attached to the arm is necessary to be operated by

hydraulic system. The wire rope arrangement in such locations may not

handle work effectively and may not do expected job. The followingproblem may arise when the bucket is operated by rope (one side )


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effectively.

Advantages:The system eliminates much of the hydraulic network.

The losses incurred in this case may be reduced since the hydraulic

system which offers viscous resistance are minimized and only few

parts may be encountered.


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The advantages of the above system can be experienced

onl when the s stem is studied well and ut into real workin model.

Some drawbacks:

. .

2. System is not recommended for heavy duty applications.

.

rope system is needed and hence it seems to be quite in comfort.

.

storing and supplying electric energy is the main draw back.


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Conclusions:Although the development of the wire rope mechanism

seems to be difficult, it may be confirmed about the usage by making a

prototype of the above said mechanism, evaluating all the constraints andpossible limitations. Also the performance of both the diesel engine and

motor helps us to decide the suitable type of power input to the system.

All we need is to develop a suitable system capable of storing large

amounts of electric energy. Results of any idea will be found only when it

is put into practical model and hence the above said model may be

prepared, as there is no harm in trying.


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Dedicated to..

Thank you.Lord S ri Venkateswara

y

Th E dhe End

Wire Rope excavator/cranes

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