1.2.3.bulldozers

stv cc ppt unit I (1.2) em&ce- capacity and application of earthmovers
3. Bulldozers.

Unit I (1.2)
Earth moving and construction equipmentscapacity and applications of earthmovers-3.Bulldozers.

BAM 802 SPECIAL TYPE OF VEHICLES
2013-2014
- C.COOMARASAMY- PROF/AUTO- BIST

1.2.3. 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.

1.2.3.1. BULLDOZERS -TRACKED
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
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- OVAL DRIVE

Bulldozers are used to push soil, rocks, trees, and other materials with its large front blade

1.2.3.1. BULLDOZERS –TRACKED- OVAL DRIVE

idler

driving wheel

track
tensioner

crawler belt

shoes
guide (pilot) wheel

runners

Oval drive

Mini Bulldozer

pins

1.2.3.1. BULLDOZERS –TRACKED-DELTA DRIVE
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
Up-to-date controls

Laser control

Bulldozer equipped with ripper attachment

Satellite control

1.2.3.2. BULLDOZERS- WHEELED
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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.

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

1.2.3.4. BULLDOZERS- CRAWLER-CAPACITIES
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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.
D31EX-22 Dozer Blade Capacity: 1.61 (m3) / 2.11 (yd3)
D31PX-22 Dozer Blade Capacity: 1.61 (m3) / 2.11 (yd3)

1.2.3.4. BULLDOZERS- CRAWLER-CAPACITIES
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D65EX-16
D65PX-16
D65WX-17
D65WX-16
D65EX-17
D65PX-17
D85EX-15 Dozer Blade Capacity: 7 (m3) / 9.16 (yd3)
D155AX-6 Dozer Blade Capacity: 9.4 (m3) / 12.29 (yd3)

1.2.3.5. BULLDOZERS- CRAWLER-DIMENSIONS

1.2.3.6. BULLDOZERS- APPLICATIONS
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.

1.2.3.bulldozers

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