Asphalt Drum Mix Plant

Gajjar Equipments Private Limited specializes in manufacturing stationary asphalt mixing plants designed for long-term asphalt production at fixed locations. These plants offer high production capacity, efficiency, and reliability, making them ideal for small & large-scale projects such as village roads, highways, airports, and industrial developments. Equipped with advanced control systems and additional features, these stationary plants optimize performance and ensure consistent quality of the asphalt mix.

STATIONARY

Asphalt Drum Mix Plant

CONTINUOUS ASPHALT MIXING PLANT

Capacity range:
30 TΡΗ ΤΟ 160 ΤΡH

Exceptional
Pavement Mix Output

HIGHLIGHTS

Manufactured with latest technology meeting MORT&H and International standards
Fully automatic operation with manual override facility
High accuracy aggregate feeder bins with no flow indicator switch
Glass wool insulated dryer drum covered with SS claddings
Two stage, high & low pressure jet auto burner (Optional: modulating burner)
Microprocessor based electronic control panel with A.C. drives

Working Principles

1. Weighing Virgin Aggregates:

The virgin aggregates (such as sand, gravel, and crushed stone) are individually weighed from the cold feed bins using a variable, continuous, and automatic belt speed. The proportions are determined by the control systems. Once weighed, the aggregates are transferred to the dryer via a charging conveyor.

2. Drying and Heating:

The aggregates enter the primary zone of the drum mix plant, where heat from the burner dries and heats them. Next, the aggregates move to the secondary zone, where asphalt is added. Here, the aggregates and asphalt are thoroughly blended. Continued drying also occurs in the secondary zone.

3. Aggregate Flow and Mixing:

Drum mixers are equipped with flights (internal paddles) that direct the aggregate flow and spread the aggregates across the cross-section of the drum. The aggregates must not only rotate with the revolving motion of the drum but also spread out sufficiently. This ensures quick and efficient heating and drying of all particles.

4. Continuous Asphalt Production:

The drum mix plant produces the asphalt concrete mix continuously. To manage this continuous flow, a temporary holding bin or surge silo is used. Various conveying devices can transport the asphalt concrete from the discharge end of the drum mixer to the holding bin or surge silo. Common means of transport include bucket elevators, drag slat conveyors, and belt conveyors.

Key Components of Asphalt Drum Mix Plant

The aggregate feeding bins in Gajjar Asphalt Mixing plants are equipped with variable speed drive motors and gearboxes for each bin. These motors allow precise control and regulation of the aggregate flow individually, enabling the addition of the required proportions of individual aggregates according to the mix design.

The drying and mixing drum in a hot mix plant is a critical component. As its name suggests, it performs the task of drying the aggregates as they enter the drum. Later in the process, the aggregates are effectively mixed with bitumen and other minerals. The drum is equipped with specially designed flights that thoroughly treat each type of aggregate during the drying process. These flights also facilitate uniform mixing with bitumen and other minerals.

Gajjar makes asphalt drum mix plant features an efficient, low-noise burner that can operate using diesel, LDO (Light Diesel Oil), and furnace oil (optional). This maintenance-free burner produces a strong flame, effectively heating the aggregates to their maximum temperature. By continuously reducing the aggregate moisture content, the burner ensures optimal production. The burner uses a two/three nozzle type pressure jet system with high- low intensity. This design enhances fuel efficiency.

The load-out conveyor serves to discharge the hot mix material into a truck. At the other end, it is equipped with a GOB (Gate-Operated Bin) hopper. The GOB hopper helps control the segregation of the mixed asphalt. It is beneficial to have hydraulically operated gates for efficient operation.

Asphalt storage tanks come in cylindrical O-shaped or U-shaped designs. These tanks are insulated with 50 mm thick rock wool to prevent heat loss and reduce burner fuel consumption. They are mounted on a sturdy full chassis. The standard package includes an automatic pressure jet oil burner, a bitumen pump with a jacketed oil body, and a bitumen metering system with a variable speed motor and hot oil circulation motor.

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