Introduction of Bulldozers

A bulldozer is a kind of engineering vehicle, equipped with a large metal bulldozer in front when used to lower the bulldozer, forward shoveling, and push mud, sand, stones, etc. The position and angle of the bulldozer can be adjusted to adapt to shoveling, filling, and other work, and can also be used to remove obstacles.

A bulldozer is a kind of road construction machinery loaded with bulldozers in front of the tractor, used for bulldozing, leveling construction sites, etc. The dozer starter can be used to control the bulldozer to work. For example, in road construction, bulldozers can complete the processing of road base footings, roadside to take the soil lateral Tim building height of not more than 1-meter embankment, along the center line of the road to shovel digging transfer, soil transport roadbed excavation and filling works, according to the mountain to take the soil to build half embankment half rift valley roadbed. In addition, bulldozers can also be used to level the site, pile up loose materials, remove obstacles within the operating lot, etc.

Classification of Bulldozers

Walking Style

Bulldozers can be divided into two types: crawler type and tire type. Crawler bulldozers have high traction force, small grounding pressure (0.04-0.13MPa), and strong climbing ability, but low driving speed. Tire-type bulldozer has high driving speed, flexibility, short operation cycle time, and convenient transportation and transfer, but small traction force, which is suitable for changing site and field work frequently.

Classification by Application

Bulldozers can be divided into two types: general-purpose and special-purpose. The general-purpose type is a standard model, which is widely used in earthmoving projects. Specialized models are used in specific working conditions, such as wetland bulldozers and swamp bulldozers that use triangular wide track plates to reduce ground pressure, amphibious bulldozers, underwater bulldozers, cabin bulldozers, unmanned bulldozers, and bulldozers for highland and high humidity conditions.

Development History

The track-type tractor, also called the crawler dozer, was successfully developed by American Benjamin Holt in 1904, which was formed by installing a human-controlled lifting dozer in front of a crawler tractor. Benjamin Holt was also one of the founders of Caterpillar Inc. in the United States. In 1925, Holt Manufacturing Company and C.L. Best Bulldozer Company merged to form the Caterpillar Bulldozer Company, which became the world's first bulldozer manufacturer and successfully launched the first batch of Type 60 bulldozers with diesel engines in 1931. With the continuous progress of technology, all bulldozers are now powered by diesel engines, and all bulldozer blades and losers are lifted by hydraulic cylinders.

In addition to crawler bulldozers, there are also tire bulldozers, which appeared about ten years later than crawler bulldozers. Since crawler bulldozers have better attachment performance and can exert greater traction, the variety and number of their products far exceed those of tire bulldozers at home and abroad. Internationally, Caterpillar is the world's largest engineering machinery manufacturing company, which produces crawler bulldozers with 9 series of D3-D11, large, medium, and small, the largest D11 RCD, diesel flywheel power of 634kw, and many engine parts.

Japan's Komatsu listed second, only in 1947 began to introduce the production of D50 crawler bulldozers, now there are 13 series of crawler bulldozers, from D21-D575, the smallest is D21, with diesel flywheel power of 29.5kw, the largest is D575A-3SD, diesel flywheel power of 858kw, it is also the largest bulldozer in the world; another Another unique bulldozer manufacturer is Germany's Liebherr Group, whose bulldozers all use the hydrostatic drive, the technology after more than a decade of research and development, the prototype was launched in 1972, and in 1974 began mass production of PR721-PR731 and PR741 hydrostatic drive crawler bulldozers, due to the limitations of the hydraulic components, the current maximum power is only 295Kw, the model PR751 for mining.

The above three bulldozer manufacturers represent the highest level of crawler bulldozers in the world today. Several other foreign crawler bulldozer manufacturing companies, John Deere, Case, New Holland, and Dresta, also have a higher level of production technology.