BAM 802 SPECIAL TYPE OF VEHICLES 2013-2014 - C.COOMARASAMY- PROF/AUTO- BIST Unit I (1.2) Earth moving and construction equipments- capacity and applications of earthmovers-3.Bulldozers. v cc ppt unit I (1.2) em&ce- capacity and application of earthmover Bulldozers.
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BAM 802 SPECIAL TYPE OF VEHICLES2013-2014- C.COOMARASAMY- PROF/AUTO- BIST
Unit I (1.2)
Earth moving and construction equipments-
capacity and applications of earthmovers-3.Bulldozers.
stv cc ppt unit I (1.2) em&ce- capacity and application of earthmovers3. Bulldozers.
A bulldozer is a
- large powerful tractor, also called as
crawler tractor (track type or chain type) (track laying) (continuous tracked tractor)
- equipped with a substantial (large) metal plate (known as a blade)
in front used to push large quantities of
soil, sand, rubble, or other such material (flattens areas of ground) during construction or conversion work
- and typically equipped at the rear with
a claw-like device (known as a ripper)
to loosen densely compacted materials.
The term "bulldozer" is often used erroneously to mean any heavy equipment
(sometimes a loader and sometimes an excavator),
- but precisely, the term refers only to a
tractor (usually tracked) fitted with a dozer blade.
In such Crawler tractors, there is endless chain or track in place of pneumatic wheels.
They are distinguished by a large ground contact area and therefore have a good track adhesion;
Such crawler tractors show a high cross-country power,
and are capable of developing high pull.
KOMATSU
1.2.3.1. BULLDOZERS -TRACKED
1.2.3.1. BULLDOZERS -TRACKED
Bulldozers / Tracked or 'crawler' tractors. They are generally used in farms where
soils are difficult to cultivate, such as
heavy clays, or where seasons are
shorter and wet conditions predominate. More power can be transmitted to the
drawbar than wheeled tractors. Maintenance costs are however
higher than for wheeled tractors. Also, unlike wheeled tractors, they must be
transported from field to field by a 'low loader'. High powered, high speed tracked tractor that
runs on rubber tracks and can be driven on the road
are also available. This model may make the tracked tractor more popular in future.
Tracked tractors have power ratings of 65-700 HP.
1.2.3.1. BULLDOZERS -TRACKED
1.2.3.1. BULLDOZERS -TRACKED
Bulldozers are used to push soil, rocks, trees, and other materials with its large front blade
1.2.3.1. BULLDOZERS –TRACKED- OVAL DRIVE
shoestracktension
eridler guide (pilot) wheel
driving wheelcrawler belt runners
pinsOval drive
1.2.3.1. BULLDOZERS –TRACKED- OVAL DRIVE
Mini Bulldozer
Advantages of delta drive: due to elevated engine and drive
risk of getting dust (mud) in is less longer operation (life) time increased bulk clearance
Disadvantages of delta drive: higher costs of manufacturing more components, longer crawler belt.
1.2.3.1. BULLDOZERS –TRACKED-DELTA DRIVE
Bulldozer equipped with ripper attachment
Satellite control
Laser control
Up-to-date controls
1.2.3.1. BULLDOZERS –TRACKED-DELTA DRIVE
Another type of bulldozer is the wheeled bulldozer, which generally has four wheels driven by a 4-wheel-drive system and has a hydraulic, articulated steering system.
The blade is mounted forward of the articulation joint, and is hydraulically actuated.
1.2.3.2. BULLDOZERS- WHEELED
Wheeled Bulldozer
1.2.3.3. BULLDOZERS –BLADES
A Straight Blade ("S-Blade") which is short and has no lateral curve, no side wings, and can be used for fine grading.
A Universal Blade ("U-Blade") which is tall and very curved, and has large side wings to carry more material.
An Angling Blade (Angle blade or angle dozer.) which is lower, straight across the face, has a very curved profile designed to roll material in front of it and has the ability to be angled to either side to facilitate movement of material across the machine's path in front of the blade. The angling blade is w i d e r than a straight or semi-U blade to allow for angling across the machine.
A "Semi-U" combination blade which is shorter, has less curvature, and smaller side wings. This blade is typically used for pushing piles of large rocks, such as at a quarry.
In recent years, adaptations of the angling blade have featured power angling and power side-to-side tilting of the blade on the move by the use of hydraulic rams. These blades are commonly called 'power angle and tilt' (PAT) blades and are most commonly fitted to smaller crawlers used for clean-up and finishing work.
1.2.3.3. BULLDOZERS –BLADES
U-Dozer Blades feature U shaped wings and are built to withstand the toughest mining environments.
Semi-U dozer blade wings are fitted with end bits, allowing for effective push.
Dymax mining
1.2.3.3. BULLDOZERS –BLADES
The capacity of Dozer is indicated by engine horse power and blade volume. Dozers can be as small as 62 hp to as high as 1150 hp.
Bulldozers can be found on a wide range of sites, Land excavation, road construction etc., in mines and quarries, military bases, heavy industry factories, engineering projects and farms.