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GROW MORE FACULTY OF

ENGINEERING PRESENTS PPT ON

ulldozer


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WHAT IS BULLDOZER

Machines designed preliminary for cutting &pushing material relatively short distance.Consist of a tractor with a front mounted bladecontrolled by hydraulic cylinders use for differentcut for different depth & leveling as per condition ofland.


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P URPOSE OF BULLDOZER

Clear site of workLeveling of landPrepare roads on hilly areas as well as hard ground

Excavate the material and haul in between 100meters distance.Spreading earthBackfilling trenches

Maintaining haul roads


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CLASSIFICATION OF BULLDOZERS :

It may either cable controlled or hydrauliccontrolled.Depending upon mountings bulldozers classified as

I. crawler tractor mounted bulldozersII. Wheel tractor mounted bulldozers


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WHEEL TRACTOR MOUNTED BULLDOZERS


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CRAWLER MOUNTED BULLDOZERS


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CLASSIFICATION OF BULLDOZERS :

Depending on nature of blade:I. Front casting dozerII. Angle dozer

In case of front casting dozer blade is fixedperpendicular to the direction of travel.In case if Angle dozer the blade is fixed at anangle with the direction of travel.


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FRONT CASTING DOZER


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ANGLE DOZER


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COMPARISON :

In case of front casting dozer it moves earth in theforward direction.In case of Angle dozer it moves earth one side inthe forward direction.

Due to this different types of blades it canconverted in two types.


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S IZE & OUTPUT OF BULLDOZER

Size of bulldozer indicated by the dimensions ofblade & its output depends upon its operatingcondition.Each blade has a capacity of hauling a particulartype of earth & knowing the number of turns abulldozer can be estimated.Output of all the earth moving machinery dependson given factors.


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F ACTORS AFFECT OUTPUT OF MACHINERY

a. Efficiency of operatorb. Nature of soilc. Topography of area

d. Type of equipmente. Weather


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UTILITY OF A BULLDOZER

By suitable attachments to the bulldozer, it can beutilized to remove trees,rocks,boulders etc.In order to increase output two bulldozers workingside by side with their blades in contact , can beused.It can be used on wet ground and all types ofweather conditions.


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ADVANTAGES OF C RAWLER MOUNTED DOZER

It delivers greater attractive effort especially whenoperating soft grounds as loose or muddy soil.Capacity to travel over muddy surface.

Work on different type of soil. Ability to travel on rough surface, which may reducethe cost of maintaining the hauling roads.


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ADVANTAGES OF CRAWLER MOUNTED DOZER

Greater flotation due to the lower pressure underthe track.Good for short distance jobs.

Greater use in different type of jobs.Can push large blade loads.Speed is slow about 8 to 16 kmph.


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ADVANTAGES OF WHEEL MOUNTED DOZER

Provide higher travel speed from 13 to 42 kmph onthe job or from one job to another job.Eliminates the necessity of hauling equipmentrequired to transport the dozer to the job.Greater output, especially when considerable travelis necessary.Less fatigue to operator.


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ADVANTAGES OF W HEEL MOUNTED DOZER

It is good for long distance.It can travel on paved highways without damagingthe surface.

It is best for handling loose soil.It can push moderate blade load.


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BLADES OF DOZER

Made from mold boards which having concaveprofile.Blades are connected with dozer with the help ofpush arms and tilt cylinders or a C frame.Based on different type of work application the sizeof blade is varies.


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WHAT IS TILT ?

In some machines either end of the blade can beraised or lowered in the vertical plane of the bladecalled Tilt.The movement takes place within the vertical planeof the blade.Tilting enables the concentration of dozer drivingpower on a limited portion of the length of theblade.


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WHAT IS PITCH ?

The top of the blade can pitched forward orbackward varying the angle of attack of the cuttingedge. it is known as pitch.This is pivotal movement about the point ofconnection between the dozer and blade.When top of blade pitch forward, the bottom edgemoves back. This increase the angle of cuttingedge attack.


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WHAT IS ANGLING ?

Blades which are mounted on a C frame can be turnedfrom the direction of travel. It is known as angling.This features are not applicable for all blades.Turning the blade in such a way that it is notperpendicular to the direction of the travel of the dozer isknown as angling.

Angling causes the pushed material to roll off thetraveling end of trailing end of blade.This process of rolling material off one end of the blade isknown as side casting.


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