At present, the spreading effect of asphalt distributors truck is not satisfactory, and there is a phenomenon of uneven horizontal spreading, and horizontal stripes are a typical horizontal uneven phenomenon. However, certain measures can effectively improve the lateral uniformity of asphalt spreading.

(1) Improved nozzle structure

This has the following purposes: one is to adapt to the structure of the spray pipe, so that the asphalt flow distribution of each nozzle is close to the same; the other is to make the shape and size of the spray projection surface of a single nozzle meet the design requirements, achieve optimal, and make the area The asphalt flow distribution meets the design requirements; the third is to adapt to the construction requirements of different varieties of asphalt and different spraying volumes.

(2) Appropriately increase the speed of spraying

From the above discussion, it can be seen that as long as the speed of the intelligent asphalt distribution truck changes within a reasonable range, it will have no effect on the longitudinal uniformity of asphalt distribution. Because when the truck speed is fast, the amount of asphalt sprinkled per unit time becomes larger, while the amount of asphalt sprinkled per unit area remains unchanged, but the change of truck speed has a greater impact on the lateral uniformity. When the vehicle speed is fast, the single nozzle flow per unit time increases, the spraying projection area increases, and the number of overlaps increases; at the same time, the jet velocity increases, the impact energy of asphalt increases, the effect of "shock-splash-homogenization" is enhanced, and horizontal spraying It is more uniform, so you should try to use a faster speed to keep the transverse uniformity at all times.

(3) Improve asphalt properties

From the above analysis, it can be seen that when the viscosity of asphalt is high, the flow resistance of asphalt is large, the spray forming is small, and the number of overlaps is reduced. In order to overcome these shortcomings, the general approach is to increase the diameter of the nozzle, but this will inevitably reduce the jet velocity, weaken the "impact-splash-homogenization" effect, and make the lateral distribution uneven. Therefore, in order to improve the construction performance of asphalt, asphalt properties should be improved.

(4) The height of the spray pipe from the ground can be adjusted to achieve closed-loop control

However, in actual construction, since the spraying fan angle is difficult to predict and monitor, and it changes with changes in vehicle speed, asphalt type, temperature, viscosity, spraying amount, etc., it is best to determine the height from the ground according to construction experience.