The Working Principle and Structure of Asphalt Drum Mix Plant

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Working Principle

First,the cold aggregate, asphalt and mineral filler are weighed respectively. Then the cold aggregate is conveyed to the dryer drum. Meanwhile, the mineral and asphalt are also delivery to the periphery of inner drum. After the cold aggregate is heated, the hot aggregate will flow into the drum periphery. Therefore, the materials are mixed together continuously. The repeated processes are lasting all the time. The drying method of cold aggregate adopts downstream mode. The finished products are poured from the drying mixer drum, which are delivered to the construction sites.

Main Structure

1.Aggregate batching system

Aggregate batching system main includes: batch hopper, feeding belt, collecting belt, vibrating screen and belt conveyor. There are 4 batch hoppers carrying aggregates with different specifications to meet the gradation requirements of asphalt mixture. At the lower part of each batch hopper equipped with adjustable belt feeder, which can realize stepless speed regulation. The collecting belt under the hoppers will collect the aggregates and transfer them to the vibrating screen. Particles with diameter >40mm will be screened out, and the rest will be sent to the belt conveyor. Then the belt conveyor will move the aggregates to the drum dryer (drying drum).

2. Drying & mixing system

Drying & mixing system consists of drying cylinders, combustion devices, and oil ignition system components, etc. Drying drum contains 4 carrier rollers, 2 rolling rings, 2 blocking wheels, a cylinder and shovel plates. The cylinder was supported by carrier rollers with its rolling rings and driven by the reduction gears stably and evenly. When aggregates get into the drying drum, they will be raised by the shovel plate to the highest point and then poured down, forming a wall where the fire will go through to dehydrate the materials. The cylinder is rolling with inclination of 3.5°to get the aggregates mixed with bitumen and out off the cylinder for elevating in right time.

3.Bitumen supply system

The bitumen supply system is composed of bitumen tank, bitumen gear pump, pipes and bitumen spray tube. The gear pump is driven by the adjustable-speed motor and transfer the bitumen from bitumen tank to the drying drum for mixing process.

4.Dust Collecting System

The dust collecting system has two collecting levels, cyclone dust filter and water dust collector. The purified air flies up and gets discharged from the chimney, while the dust mud sinks in the sedimentation basin thanks to the gravity.

In 2014, a set of MDHB20 had been bought by a Kenya client from Liaoyuan Machinery. After delivering the asphalt drum plant to customer, we begin to arrange professional engineers to assist the client to install the asphalt drum plant. Time flies! Recently, the whole process had been finished finally through months’ hard working. In there, our engineer helped them to solve a lot of questions and run the machine normally. This event is very meaningful for us. This symbolized that in the international market, we will go further and further. More content here:https://www.lyroad.com/cases/362-mdhb20-asphalt-drum-plant-in-kenya-successful-installed.html

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