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.

1.2.3. BULLDOZERS

1.2.3. BULLDOZERS

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.

D31EX-22 Dozer Blade Capacity: 1.61 (m3) / 2.11 (yd3) D31PX-22 Dozer Blade Capacity: 1.61 (m3) / 2.11 (yd3) D37EX-23 Dozer Blade Capacity: 1.91 (m3) / 2.5 (yd3) D37PX-23 Dozer Blade Capacity: 1.95 (m3) / 2.55 (yd3) D37EX-22 Dozer Blade Capacity: 1.77 (m3) / 2.32 (yd3) D37PX-22 Dozer Blade Capacity: 1.95 (m3) / 2.55 (yd3) D39EX-23 Dozer Blade Capacity: 2.21 (m3) / 2.89 (yd3) D39PX-23 Dozer Blade Capacity: 2.4 (m3) / 3.14 (yd3) D39EX-22 Dozer Blade Capacity: 2.21 (m3) / 2.89 (yd3) D39PX-22 Dozer Blade Capacity: 2.3 (m3) / 3.01 (yd3) D51EX-22 Dozer Blade Capacity: 2.7 (m3) / 3.53 (yd3) D51PX-22 Dozer Blade Capacity: 2.9 (m3) / 3.79 (yd3) D61EX-15 Dozer Blade Capacity: 3.4 (m3) / 4.45 (yd3)

1.2.3.4. BULLDOZERS- CRAWLER-CAPACITIES

D61PX-15 Dozer Blade Capacity: 3.8 (m3) / 4.97 (yd3) D61EX-23 Dozer Blade Capacity: 3.4 (m3) / 4.45 (yd3) D61PX-23 Dozer Blade Capacity: 3.9 (m3) / 5.1 (yd3) D65EX-16 D65PX-16 D65WX-17 D65WX-16 D65EX-17 D65PX-17 D85PX-15 Dozer Blade Capacity: 5.9 (m3) / 7.72 (yd3) D85EX-15 Dozer Blade Capacity: 7 (m3) / 9.16 (yd3) D155AX-6 Dozer Blade Capacity: 9.4 (m3) / 12.29 (yd3) D155AX-7 Dozer Blade Capacity: 9.4 (m3) / 12.29 (yd3) D275AX-5 Dozer Blade Capacity: 14.6 (m3) / 19.1 (yd3)

 

1.2.3.4. BULLDOZERS- CRAWLER-CAPACITIES

1.2.3.5. BULLDOZERS- CRAWLER-DIMENSIONS

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.

1.2.3.6. BULLDOZERS- APPLICATIONS