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Bulldozers

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ppt about bulldozer

ppt about bulldozer

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  • 1. GROW MORE FACULTY OF ENGINEERING PRESENTS PPT ON Bulldozer
  • 2. WHAT IS BULLDOZER  Machines designed preliminary for cutting & pushing material relatively short distance.  Consist of a tractor with a front mounted blade controlled by hydraulic cylinders use for different cut for different depth & leveling as per condition of land.
  • 3. CRAWLER DOZERS  It is equipped with special clearing blades which are excellent machine for loud clearing.  Heavy ripping of rock is accomplished by crawler dozers with use of rippers which are mounted rear of dozers.
  • 4. PURPOSE OF BULLDOZER  Clear site of work  Leveling of land  Prepare roads on hilly areas as well as hard ground  Excavate the material and haul in between 100 meters distance.  Spreading earth  Backfilling trenches  Maintaining haul roads
  • 5. CLASSIFICATION OF BULLDOZERS:  It may either cable controlled or hydraulic controlled.  Depending upon mountings bulldozers classified as I. crawler tractor mounted bulldozers II. Wheel tractor mounted bulldozers
  • 6. WHEEL TRACTOR MOUNTED BULLDOZERS
  • 7. CRAWLER MOUNTED BULLDOZERS
  • 8. CLASSIFICATION OF BULLDOZERS:  Depending on nature of blade: I. Front casting dozer II. Angle dozer  In case of front casting dozer blade is fixed perpendicular to the direction of travel.  In case if Angle dozer the blade is fixed at an angle with the direction of travel.
  • 9. TYPES OF DOZER BLADES
  • 10. FRONT CASTING DOZER
  • 11. ANGLE DOZER
  • 12. COMPARISON :  In case of front casting dozer it moves earth in the forward direction.  In case of Angle dozer it moves earth one side in the forward direction.  Due to this different types of blades it can converted in two types.
  • 13. SIZE & OUTPUT OF BULLDOZER  Size of bulldozer indicated by the dimensions of blade & its output depends upon its operating condition.  Each blade has a capacity of hauling a particular type of earth & knowing the number of turns a bulldozer can be estimated.  Output of all the earth moving machinery depends on given factors.
  • 14. FACTORS AFFECT OUTPUT OF MACHINERY a. Efficiency of operator b. Nature of soil c. Topography of area d. Type of equipment e. Weather
  • 15. UTILITY OF A BULLDOZER  By suitable attachments to the bulldozer, it can be utilized to remove trees,rocks,boulders etc.  In order to increase output two bulldozers working side by side with their blades in contact , can be used.  It can be used on wet ground and all types of weather conditions.
  • 16. ADVANTAGES OF CRAWLER MOUNTED DOZER  It delivers greater attractive effort especially when operating 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 reduce the cost of maintaining the hauling roads.
  • 17. ADVANTAGES OF CRAWLER MOUNTED DOZER  Greater flotation due to the lower pressure under the 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.
  • 18. ADVANTAGES OF WHEEL MOUNTED DOZER  Provide higher travel speed from 13 to 42 kmph on the job or from one job to another job.  Eliminates the necessity of hauling equipment required to transport the dozer to the job.  Greater output, especially when considerable travel is necessary.  Less fatigue to operator.
  • 19. ADVANTAGES OF WHEEL MOUNTED DOZER  It is good for long distance.  It can travel on paved highways without damaging the surface.  It is best for handling loose soil.  It can push moderate blade load.
  • 20. BLADES OF DOZER  Made from mold boards which having concave profile.  Blades are connected with dozer with the help of push arms and tilt cylinders or a C frame.  Based on different type of work application the size of blade is varies.
  • 21. WHAT IS TILT ?  In some machines either end of the blade can be raised or lowered in the vertical plane of the blade called Tilt.  The movement takes place within the vertical plane of the blade.  Tilting enables the concentration of dozer driving power on a limited portion of the length of the blade.
  • 22. WHAT IS PITCH?  The top of the blade can pitched forward or backward varying the angle of attack of the cutting edge. it is known as pitch.  This is pivotal movement about the point of connection between the dozer and blade.  When top of blade pitch forward, the bottom edge moves back. This increase the angle of cutting edge attack.
  • 23. WHAT IS ANGLING?  Blades which are mounted on a C frame can be turned from 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 not perpendicular to the direction of the travel of the dozer is known as angling.  Angling causes the pushed material to roll off the traveling end of trailing end of blade.  This process of rolling material off one end of the blade is known as side casting.
  • 24.  Thank You……