Japan Bulldozer, as the name itself carry bull in it that signifies power and heaviness and dozer implies pushing. As like its name, it is a heavy machine with a large blade in front, used for pushing earth and stones away and for making areas of ground flat at the same time. The term ‘bulldozer’ correctly refers only to a tractor fitted with a dozer blade.
Normally, bulldozers are large and powerful tracked heavy machine. The tracks provides them smooth ground holding capability and mobility through even on very rough terrain. Wide straps tracks help to distribute the bulldozer’s weight over a large area which reduces the ground pressure. Thus this prevent them from sinking in sandy and muddy ground. The track with extra width are known as swamp tracks or LPG (low ground ressure) tracks. Bulldozers are incorporated with transmission systems to take advantage of the track system and provide excellent tractive force. Having these specifications, bulldozers are used in construction, mining, forestry, land clearing. In infrastructure development and in projects which require highly mobile, powerful, and stable earth-moving machines.
Tools of Bulldozer :
The bulldozer’s primary tools are the blade and the ripper.
Blades: The bulldozer blades are heavy metal plates on the front of the tractor, used to push the objects, and shove sand, soil, snow and waste materials.
There are three types of blades:
Straight blade or S blade:
It is short blade and has no lateral curve and no side wings geometrically it is straight in shape, due to its straight shape it can be used in grading. It is attached to the tractor by dozer arms at the lower sides of the back of the back of the blade eliminating the option of angling. For the adjustment of horizontal blade. The S blade is vertically stabilized with angle braces to the dozer arms that may be outfitted with a hydraulically tilt cylinder. Sloping the blade enhances ground punching by concentrating the cutting force over varying blade lengths.
Universal blade or U blade:
Structurally, it is very tall and very curved and as like its name is of ‘U’ shape has large side wings to carry more material. The U shape works like a scoop to hold in materials and minimize side spillage off the blade. Because of this feature, the U blade provides good loading and material carrying qualities allowing for more efficient movement of soils over longer distances. The U blade is mounted with heavy dozer arms from trunnions on the sides of the tractor of the lower bottom corners of the blade. The U blade is vertically stabilized from the push arms with angle braces that incorporate one or two hydraulic tilt cylinders. The tilt cylinders provide the blade with the ability to concentrate on the ground punching forces thereby increasing versatility to include operations such as ditching and crowning.
Semi U OR S-U blade:
This blade is the combination of shorter and small side wings and has less curvature that is semi U. The SU blade is mounted to the tractor with the same heavy straight push arms attached to the lower back of the blade. From the dozer arms. The blade is vertically stabilized with angle braces which will incorporate one or two hydraulic tilt cylinders. Such feature increases the blade versatility to include crowning and ditching, typically used for pushing piles of large rocks, such as at a quarry.
Difference between S blade and SU blade:
The distinctive feature that assemble this blade apart from the S blade is the addition of the forward curving side wings on either ends which work to hamper material spillage. The SU blade has more efficient material carrying capability, but has less ground pushing ability than the S blade. The SU blade is certainly a good choice when it comes to performing operations like stumping, stripping, backfilling, ditching, crowning and leveling. The blade works well in soft to medium hard soils, especially with the skillful application of the tilt feature.
Another tool of Bulldozer is Ripper:
The ripper is the long claw-like device which is attached on the back of the bulldozer. It is available in single or in groups of two or more shanks. Generally single shank is preferred for heavy ripping, and the shank is fitted with a replaceable tungsten steel alloy tip, referred to as a boot. Ripping rock breaks the ground surface rock or pavement into small rubble easy to handle and transport. That can be removed so grading can take place. In agricultural sector ripping is used for breaking rocky or very hard soil, which is not ploughable.
According to the uses Bulldozers has been modified , some of the examples are:
The first example is Loader tractors. These were created by removing the blade and by attaching a large volume bucket and hydraulic arms which can raise and lower the bucket. And these are useful for scooping up earth and loading it into trucks. It has been modified it making it smaller to let it operate in small work areas where movement is limited, such as mining. However, other lightweight form of bulldozer are commonly used in snow removal and as a tool for preparing winter sports area for ski and snowboard sports. A very small light bulldozer is sometimes called a “calfdozer”. In an angle dozer the blade can be pushed forward at one end to make it easier to push material away to the side.
Types of bulldozer:
The main factors that differentiate bulldozers are weight, size, and horsepower. It depends on kind of work whether you require enhanced mobility and flexibility. Or superior strength and the ability to move significant amounts of material .
These bulldozers are used to push heavy materials, like sand, from one place to another. They look alike tractors, although they are tracked, and they don’t have tires. Larger models of crawler usually, have rippers integrated to the rear and can be used for breaking up or crushing hard surfaces. They are well suited for fields and other having irregular surface due to presence of their abrasive plate. The large plate at the front of a crawler is used to move loads.
These are the another common form of dozers known as wheel bulldozers. These are considerably larger than crawlers and are most often used in bigger construction projects. They are extremely efficient and offer significant benefits in terms of their high-performance. While their large, heavy tires allow for increased functionality. So, the key distinction between crawlers and wheel dozers is that the latter can move and steer on a considerably smaller axis. Also, this makes wheel dozers more manoeuvrable. A wheeled dozer also has the benefit of completely articulated hydraulic steering. That makes it very easy to operate and flexible to handle.