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road roller

Category:

mechanical equipment

Keywords: engineering construction

The mill structure includes light mill, trough mill and sheep's foot mill. Light milling is the most common application, mainly used for pavement surface compaction. Using mechanical or hydraulic transmission, it can concentrate the force to compact the protruding part, and the compacting flatness is high, which is suitable for asphalt road compaction operations.

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Road roller belongs to the category of road equipment in construction machinery, and is widely used in high-grade highway, railway, airport runway, dam, stadium and other large-scale engineering projects filling compaction operations, can roll sandy, semi-cohesive and cohesive soil, subgrade stabilized soil and asphalt concrete pavement layer. The roller is suitable for various compaction operations by the gravity of the machine itself, so that the compacted layer is permanently deformed and compact. Road rollers are divided into two categories: steel wheel type and tire type.

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The mill structure includes light mill, trough mill and sheep's foot mill. Light milling is the most common application, mainly used for pavement surface compaction. Using mechanical or hydraulic transmission, it can concentrate the force to compact the protruding part, and the compacting flatness is high, which is suitable for asphalt road compaction operations.

According to the wheel axle, there are single-axle single wheel, double-axle double wheel, double-axle three-wheel and three-axle three-wheel. Powered by an internal combustion engine, it adopts mechanical transmission or hydraulic transmission. General front-wheel steering, good maneuverability, rear-wheel drive. In order to improve steering and rolling performance, it is advisable to use articulated steering structure and all-wheel drive. The front wheel frame and rack are articulated to reduce fuselage swing when the road surface is uneven. The rear wheels and frame are rigidly connected. It adopts hydraulic operation and control of steering with hydraulic cylinders. The front and rear rollers are equipped with scrapers to remove debris from the rollers. A water spray system is also installed to sprinkle water on the roller when compacting asphalt pavement to prevent the asphalt mixture from adhering. In order to increase the force, iron, sand, water, etc. can also be installed in the roller to increase the pressure weight.

The main technical parameters of drum rollers are machine weight and line pressure. In the 80s, the weight range of various steel wheel rollers was about: 2~13 tons for two-wheel rollers, 1~15 tons for three-wheel rollers, 1~3 tons for pressurized according to needs, 13~14 tons for three-axle three-wheel rollers, and 18~19 tons after pressurization.

The roller adopts pneumatic tires, generally equipped with 3~5 front wheels and 4~6 rear wheels. If the inflation pressure is changed, the grounding pressure can be changed, and the pressure adjustment range is 0.11~1.05 MPa. Tire rollers are equipped with hydraulic, hydraulic or mechanical transmission systems, single-axle or full-shaft drive, and three-point support with wide-base tire articulated frame structure. The compaction process has a kneading effect, so that the particles of the compacted layer are embedded without destruction, and are uniformly compact. Good maneuverability, fast travel speed (up to 25 km / h), used for the compaction of engineering cushions such as roads and airports.

Towed vibrating roller can effectively compact all kinds of soil and rock fill, suitable for modern highways, airports, embankment fills, seaports, embankments, railways, mines and other engineering construction

A roller with many bumps is installed on the drum. Because the bump resembles a sheep's foot, it is called a sheep's foot mill, also known as a sheep's foot mill. The shape of the bump is sheep's foot, cylindrical and square. The drum shaft is supported on the bearings of the traction frame to expand the range of use. The drum can be filled with water, sand or iron sand to increase the crushing weight. A comb scraper is installed under the frame before and after the drum to remove mud trapped between the bumps.

The towed sheep's foot mill is towed by a tractor. Self-propelled sheepfoot rollers are also known as tamping rollers. The unit pressure of sheep's foot milling is large, so that the filler is uniform, has a tamping effect, and has a large degree of compaction, especially for hard clay, suitable for compacting cohesive soil and crushed stone layer. Especially for hard clay, the bump has the effect of stirring, kneading and tamping, and has the effect of tamping, so that the filler is uniform, and the upper and lower layers are bonded to avoid delamination. It is widely used in the compaction of roadbeds, bedding and embankments.

Self-propelled sheep's foot mill can also be installed in the drum with an excitation device to make a vibrating tamping compactor, using the excitation force to increase the compaction effect, and the drum can be filled with water, sand or iron sand to increase the weight of the roll. Expand the scope of use.

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