Bulldozer is an attachment to the base-tracked or wheeled tractor, including blade knives, pushing device in the form of beams or frames, and system management blade.
The main parameter in the technology “bulldozer” is the traction of basic tractor (the truck tractor). Bulldozer is used for leveling and earth moving, as well as pre-loosened rocks and frozen ground. They help to produce a plan of building sites, construction of embankments, excavations and the development of pits, cutting terraces into the hillside, digging trenches for the foundations and communication, filling ditches, pits, trenches, ditches and the sinus the foundations of buildings, clearance of snow, rocks, bushes, Debris …. Bulldozers are widely used in the construction industry: it is determined by the simplicity of their design, reliability and economy in operation, high productivity, mobility and versatility.
The modern bulldozer gains the maximum possible volume of drawing ground on the place of a length of 6 … 10 pm. Economically expedient range of earth moving is not less than 60 – 80 m for the tracked base and 100 -140 m for pneumatic machines.
A caterpillar bulldozer of high traction and traffic ability is the most common now. The higher the towing vehicle class is, the greater the amount of excavation it is capable of performing and develop more solid grounds.
Bulldozers are classified by purpose, traction class and type of the navigation device of basic machines, construction of worker body and type of system management blade.
To appointment we can distinguish bulldozer of general-purpose used to perform basic earth-transport and auxiliary works in different soil and climatic conditions and specific, used to carry out targeted work in specific soil conditions, or technological conditions. The latter ones include a bulldozer pusher, underground and underwater bulldozer.
Depending on the traction class of basic machines bulldozer divided into: compact (Class 0,9), lung (classes 1,4 … 4), middle (grades 6 … 15), severe (grade above 25 … 35) and super heavy (class than 35).
By type of the navigation devices bulldozers are tracked and pneumatic.
To the design of the working body we distinguish a bulldozer with a non-toggling blade in terms, always perpendicular to the longitudinal axis of the base machine and with the rotary blade, which can be installed perpendicular or at an angle of 0 to 53 in both directions to the longitudinal axis of the machine. By type of management blade bulldozers are distinguished: with hydraulic and mechanical (cable-block) control. On the chop-block management system recovery blade is made with finger friction hoist through a rope tackle, lowering – under the action of gravity dump. At the hydraulic control system the raising and lowering of blade is made to force one or two double acting hydraulic cylinders. Bulldozer with mechanical control is not produced by industry nowadays.
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