China's asphalt mixing plant manufacturing technology started in the late 1960s, but it has developed rapidly and has reached the international advanced level.
asphalt mixing plant can be divided into continuous type and intermittent type according to the drying method. According to the mixing method, it can be divided into forced type and drum type. Currently, there are two types of asphalt mixing plant supplied in the Chinese market. One type is forced intermittent stirring. The equipment, the other type is a continuous drum mixing device.
The former is the most widely used equipment due to its high precision and good finished product quality.
The five cold silos in the feeding section hold different aggregates, and the lower part fixes the feeder.
The basic hardware of each feeder is the same, so the speed ratio of each feeder is the same as the ratio of the aggregate entering the heating drum. Before the production, the number of motor revolutions of each feeder is calculated according to the production quantity and the proportioning list.
The conveyor conveys the aggregate output from the feeder to the heating drum.
The size of the same type of drum produced by different manufacturers will be different. The drum of the 4000 type equipment is about 2.
5m× about 11m (diameter 2.
5m, length 11m).
The aggregate is heated and dried in the drum. The higher the initial temperature of the cold aggregate, the lower the energy consumption during the heating and drying process.
The temperature of the hot aggregate is related to the asphalt type, the construction temperature, the compaction process at the site, the distance of the construction site, etc. Generally, the cold aggregate is heated for about 5 minutes and the temperature reaches 160-220 °C to complete the heating process and the high temperature generated in the drum. The flue gas is discharged through the bag filter.
The aggregate that completes the heating and drying process is transported to the screening machine by the hoist. Its main function is to screen the hot aggregates with different particle sizes into the designated hot silo, and at the same time exclude the waste into the waste bin, and then the electronic weighing system. After the various hot aggregates are weighed according to the ratio, the hot material enters the stirring pot.
At the same time, the asphalt is transported to the stirring pot through the storage tank and the heat transfer oil boiler heating system, and then the hot asphalt and the hot aggregate are stirred to a uniform state, and the process is completed and discharged.
