Road rollers belong to the category of road equipment in construction machinery and are widely used in compaction operations for high-grade highways, railways, airport runways, dams, stadiums, and so on. So, what are the classification of rollers? This article takes you to understand.
Using the gravity of the machine itself, it is suitable for various compaction operations to make the compacted layer permanently deformed and compacted. It is divided into steel wheel type and tire type.
The rollers are constructed of light rollers, groove rollers and sheep foot rollers. Light rollers are the most common application, mainly used for road surface lamination. Adopting mechanical or hydraulic transmission, it can concentrate the force to compact the protruding part, with high compactness and flatness, suitable for compaction of asphalt pavement.
According to the wheel axis, there are single-axis single-wheel, double-axis double-wheel, double-axis three-wheel and triple-axis three-wheel. Powered by an internal combustion engine, mechanical transmission or hydraulic transmission is used. Generally, the front wheels are steered with good maneuverability and the rear wheels are driven. In order to improve steering and rolling performance, articulated steering structure and all-wheel drive should be adopted. The front wheel frame and frame are articulated to reduce fuselage swing on uneven roads. The rear wheel and frame are rigidly connected. Adopt hydraulic operation and control steering with hydraulic cylinder. The front and rear rollers are equipped with scrapers to remove the adhesive on the rollers. It is also equipped with a water spray system for spraying water to the rollers to prevent the asphalt mixture from adhering when compacting the asphalt pavement. In order to increase the force, iron, sand, water, etc. can be added to the wheel to increase the weight.
The main technical parameters of steel wheel rollers are machine weight and line pressure. In the 1980s, the weight range of various steel wheel rollers was about: 2 to 13 tons for two-wheel rollers, 1 to 15 tons for three-wheel rollers, and 1 to 3 tons for pressurization as needed, and 13 to 14 tons for three-axis three-wheel rollers After the pressurization, it is 18 to 19 tons.
Pneumatic tires are used for rolling wheels, usually equipped with 3 to 5 front wheels and 4 to 6 rear wheels. If the inflation pressure is changed, the ground pressure can be changed, and the pressure adjustment range is 0.11 to 1.05 MPa. The tire roller adopts hydraulic, hydraulic or mechanical transmission system, single-axis or full-axis drive, and three-point support of wide-base tire articulated frame structure. The compaction process has a rubbing effect, so that the particles of the compacted layer are embedded without being damaged, and are uniformly dense. It has good maneuverability and fast travel speed (up to 25km / h), and is used for compaction of engineering cushions such as roads and airports.
The towing vibratory roller can effectively compact various types of soil and rock fills, and is suitable for the construction of modern highways, airports, embankment fills, harbours, dams, railways, mines, etc.
Rollers with many bumps are installed on the drum. Because the bumps are shaped like sheep's feet, they are called sheep's foot mills, also known as sheep's foot mills. The shapes of the bumps are sheep's foot, cylinder and square column. The drum shaft is supported on the bearing of the traction frame to expand the scope of use. The drum can be filled with water, sand or iron sand to increase the rolling weight. A comb-shaped scraper is installed under the frame in front of and behind the drum to remove the mud sticking between the bumps.
The towed lamb foot mill is towed by a tractor. Self-propelled sheep's foot mill is also called ramming roller. The unit pressure of the sheep's foot mill is large, so that the filler is uniform, has a tamping effect, and the degree of compaction is large. Especially for hard clay, it is suitable for compacting cohesive soil and gravel layers. Especially for hard clay, the bumps have the effects of stirring, kneading and tamping. They have the tamping effect to make the filler even, and the upper and lower layers are well bonded to avoid delamination. It is widely used in the compaction of roadbeds, cushions and dams.
The self-propelled sheep's foot mill can also be equipped with an excitation device in the drum to make a vibratory tamping roller. The excitation force is used to increase the compaction effect. The drum can be filled with water, sand or iron sand to increase the weight of the roller. Expand the scope of use.
The main technical parameters of the sheep's foot mill are machine weight and unit pressure. Because the bump is shaped like a goat's foot, it is called a goat's foot mill
1. Compaction of the foundations of roads, railways, dams, airports, buildings, factories and residences.
2. Compaction of the waste material, ash, coal and other bulk materials in the cement plant.
3. Compact the earth and stone with relatively wide water content.
4. Compaction of rock, clay and expansive soil.
5. Flame retardant compaction of open seam.
