Asphalt distributor is a kind of black road construction machinery. It is the main equipment for highway, urban road, airport and port wharf construction. The equipment is mainly used for spraying different kinds of bituminous pavement to meet the construction requirements of different grades of pavement penetration layer, sticky layer, up and down seal layer, fog seal layer and so on.
However, the effect of some asphalt sprinkles on the market is not satisfactory, and there will be a phenomenon of uneven distribution of the transverse distribution. At this time, a certain measure is adopted to effectively improve the transverse uniformity of asphalt spreading.
1. Improving the structure of the nozzle
In order to adapt to the structure of the spray nozzle, the asphalt flow distribution of each nozzle is close to the same; two is to make the shape and size of the projection surface of the single nozzle meet the design requirements, to achieve the optimum, and to meet the design requirements in the area of the asphalt flow distribution in the region; three in order to adapt to different varieties. Construction requirements of asphalt and different sprinkled quantities.
2. Improve the speed of sprinkling
The speed of intelligent asphalt distributor has no influence on the longitudinal uniformity of asphalt spreading as long as it changes within a reasonable range. Because when the vehicle speed is faster, the amount of asphalt in a unit time becomes larger, and the amount of asphalt spraying on the unit area remains unchanged, and the change of vehicle speed has a great influence on the lateral uniformity.
When the speed is faster, the flow rate of single nozzle becomes larger in unit time, the projection surface increases and the overlap number increases; at the same time, the jet speed increases, the asphalt collision energy is increased, the impact to the splash one homogenization is enhanced and the transverse distribution is more uniform, so the faster speed should be adopted to keep the transverse evenness the most. Good.
Intelligent asphalt distributor has high sprinkler precision and no influence on vehicle speed.
3, improving the characteristics of asphalt
When asphalt viscosity is large, the flow resistance of asphalt is large, spray forming is small, and the number of overlaps decreases. In order to overcome these shortcomings, the general approach is to increase the diameter of the nozzle, but this will reduce the velocity of the jet, weaken the impact of a splash to homogenization, and make the transverse distribution uneven. In order to improve the performance of asphalt construction technology, asphalt properties should be improved.
4. To adjust the height of the sprinkler to the ground, closed loop control
As the spraying fan angle will be influenced by the speed, the kind of asphalt, the temperature and the viscosity, the height of the ground is best determined according to the construction experience and is adjusted as a basis.
The height of the spray pipe is too high, which will reduce the impact of the asphalt spray and weaken the impact of a splash to homogenization. The low altitude of the sprinkler tube will reduce the overlap number of the asphalt spray fan surface, and the height of the spray pipe should be adjusted according to the actual conditions to improve the effect of the asphalt spraying.