Asphalt spreading truck is a kind of black road construction machinery. It is the main equipment in the construction of highways, urban roads, airports and port terminals. This equipment is mainly used to spray different types of asphalt on the road surface to meet the construction needs of different levels of pavement through layer, adhesive layer, upper and lower sealing layer, fog sealing layer, etc. However, the spreading effect of some asphalt spreading trucks on the market is not satisfactory. There will be uneven horizontal distribution. A typical phenomenon of uneven horizontal distribution is horizontal stripes. At this time, certain measures can be taken to effectively improve the lateral uniformity of asphalt spreading.
1. Improve the nozzle structure
This has the following purposes: first, to adapt to the structure of the spray pipe and make the asphalt flow distribution of each nozzle nearly consistent; second, to make the shape and size of the spray projection surface of a single nozzle meet the design requirements, achieve good results, and make The asphalt flow distribution in the area meets the design requirements; the third is to adapt to the construction requirements of different types of asphalt and different spreading amounts.

2. Increase the spreading speed appropriately
As long as the speed of the intelligent asphalt spreading truck changes within a reasonable range, it will have no impact on the longitudinal uniformity of asphalt spreading. Because when the vehicle speed is faster, the amount of asphalt spread per unit time becomes larger, while the amount of asphalt spread per unit area remains unchanged, and changes in vehicle speed have a greater impact on the lateral uniformity. When the vehicle speed is faster, the flow rate of a single nozzle per unit time becomes larger, the spray projection surface increases, and the number of overlaps increases; at the same time, the jet velocity increases, the asphalt collision energy increases, the "impact-splash-homogenization" effect is enhanced, and horizontal spreading occurs More uniform, so a faster speed should be used appropriately to keep the lateral uniformity good.
3. Improve asphalt properties
If the viscosity of the asphalt is large, the flow resistance of the asphalt will be large, the injection molding will be small, and the overlap number will be reduced. In order to overcome these shortcomings, the general approach is to increase the nozzle diameter, but this will inevitably reduce the jet velocity, weaken the "impact-splash-homogenization" effect, and make the horizontal distribution uneven. In order to improve the performance of asphalt construction technology, the properties of asphalt should be improved.
4. Make the height of the spray pipe from the ground adjustable and closed-loop control
Since the spray fan angle will be affected by factors such as vehicle speed, asphalt type, temperature, viscosity, etc., the height above the ground should be determined based on construction experience and adjusted based on this: If the height of the sprinkler pipe from the ground is too high, the impact of asphalt spraying will be reduced. force, weakening the "impact-splash-homogenization" effect; the height of the spray pipe from the ground is too low, which will reduce the number of overlapping asphalt spray sectors. The height of the spray pipe should be adjusted according to the actual situation to improve the asphalt spraying effect.