Asphalt drum mix plant process starts with the feeding of cold aggregates into feed bins. The equipment is usually equipped with three or four bin feeders (or more) and aggregates are loaded into different bins as per their sizes. This is done so that different sized aggregates can be graded as per the requirement.Pollution control devices play an important part in the process. Each bin is provided with separate adjustable gates for controlling the flow of material. There is a long conveyor belt below the bins which takes the aggregates to the scalping screen.
The next part is the screening process. Here is a single deck vibrating screen which removes the oversized aggregates thus preventing them from entering the drum.
Charging conveyor plays an important role in the asphalt plant process because it not only transfers the cold aggregates from below the screen to the drum but also does the weighing of the aggregates. This conveyor is equipped with a load cell which continuously weighs the aggregates and sends signal to the control panel.
Drying and mixing drum is responsible for two operations first drying and then mixing. This drum is continuously rotating and in the course of the rotation, aggregates are transferred from one end to the other. The aggregates are treated to heat by the burner flame to reduce the moisture content in the aggregates. When we talk about the process in a parallel flow plant, the aggregates move away from the burner flame and in the counter flow plant, the aggregates move towards the burner flame. On the other end of the drum, the heated aggregates are mixed with bitumen and minerals. The drum plays an important role in the drum mix plant process.
Fuel tank for drying drum burner stores and provides fuel to the drum burner. Apart from that, the critical component includes asphalt storage tanks which store, heat and also pump required asphalt to the drying drum for mixing with the hot aggregates. Filler silos are for addition for optional filler / binder material into the mixer.
Pollution control devices play an important part in the process. They help to eliminate the harmful gases that may have escaped the environment. Primary dust collector is a dry dust collector and it works in sync with secondary dust collector which can be a bag filter or a wet dust scrubber.
Asphalt Drum mix Control Panel with PLC based fully automatic control system
Our automatic Controls include temperature controllers, burner management controller, and PLC (programmable logic controller) for control of mixing. An emergency plant shutdown control enables the operator to shut down the entire plant. Motor controls enable the operator to turn off/on power to motors that operate the air compressor, exhaust fan, drum drives, drum mixer burner blower, drag conveyor, slinger conveyor, fines-return auger and fuel pump. These controls also provide the plant operator with control of mid-stream start/stop., key switch for manual/auto control, manual start/stop buttons, cold feed control, Printer supplied for production logging of essential data from each batch. Production data online printing, Network port to allow remote viewing and control of the process on PC.
Asphalt Drum mix Control Panel with Microprocessor based Control System.
Asphalt Drum mix SCADA Software
A. Asphalt Drum Mix SCADA monitors and controls the processes which ensure to achieve the required performance consistently.
B. All the operations can be controlled from a single central location.
C. It reduces the dependency on labour force for operational requirements, as it is automated, improves the quality to high standards.
D. Asphalt Drum Mix SCADA stores all the data in its database server, thus if required, the data can be accessed in the future to assess the performances.
E. The site engineer or the construction manager has a control over all the processes at centralized location.
F. It is difficult to monitor the temperature variation in bituminous mix during transportation from plant to site; However, Asphalt Drum Mix SCADA removed this difficulty.
Features of the Asphalt Drum Mixing Plants
High thermal efficiency
Low maintenance
Easy to set up and use
Maintenance points are well set up
User friendly
Heavy duty design
High torque hydraulic ram air regulating system – trouble free air regulating
Protection guard for electrical safety
