On the working principle and maintenance knowledge of tire roller
Roller is one of the necessary mechanical equipment for road construction. Today, we are talking about tyre roller. In fact, the working principle of roller is similar, very similar, so Xiaobian simply sum up some of its own characteristics.
On the working principle and maintenance knowledge of tire roller
Tire roller is a kind of compaction machine which relies on the weight of the machine and the special tyre to increase the density of the working medium by static compaction. In addition to the vertical compaction force, it also has the horizontal pressure strength. This kind of horizontal pressure not only has the function of compaction along the direction of mechanical driving, but also has the function of compaction along the mechanical transverse direction.
One of the major characteristics of pneumatic tyres is that they can change the air pressure in the tire so as to limit the maximum compressive stress on the surface of the compacted material, thus improving the compaction effect. Under the same gravity load, the maximum compressive stress of the pneumatic tire is smaller than that of the smooth steel wheel, and the bearing capacity of the material on the surface of the layer is relatively small, so that the lower layer material can be compacted better.
Therefore, the tire roller can change the load of pneumatic tire or adjust the inflation pressure of tire to improve its compaction performance and expand its scope of use. The steel wheel roller can only change the magnitude of the linear load by changing the load of the wheel. The radial deformation of the tire increases when the pneumatic tire is repeatedly rolled, while the deformation of the layer decreases due to the increase of the strength.
On the working principle and maintenance knowledge of tire roller
The decrease of the ply deformation caused the decrease of the contact area of the tire, so that the contact stress increased, and the pressure at the end of compaction was 1.5~2 times of the pressure during the first rolling. At the same time, the rolling resistance of the pneumatic tire decreases with the increase of the ply strength, which can greatly improve the rolling effect and the compaction quality.
It can be seen that pneumatic roller can be used to crush various types of materials, including viscous and non cohesive materials, by using pneumatic tires as working devices.
Due to the pressure strength can along each direction acting on the material particles, a kneading effect plus the elasticity of tire produced by the compaction effect is excellent, so can get the maximum density.
If the asphalt mixture is compacted by the smooth steel wheel roller, the contact line of the steel wheel forms a "cross bridge" phenomenon between the large particles of the asphalt mixture, and the gap left behind by the "bridge" will produce uneven compaction. In contrast, rubber tires are flexible and compacted along these contours, resulting in better compaction surfaces and better compactness.
At the same time, because of the flexibility of the tire, not to push the asphalt mixture in front of it, but to cover the initial contact point of the mixture, to the material with a large vertical force, so as to avoid the smooth steel roller road often crack phenomenon. In addition, the tire roller also has the characteristics of increasing weight and changing the tire inflation pressure, which is more conducive to compaction of various materials.
Based on the above characteristics, base layer, tire roller has been widely applied to various materials of the basic layer, fill and asphalt pavement compaction; especially in compaction of asphalt pavement, tire road flexible compaction machine unique function is unable to substitute other compaction equipment, and thus become the main mechanical asphalt mixture the complex pressure, but also the construction of high-grade highways, airports, ports, dams and industrial construction compaction equipments.
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