An asphalt drum mixing plant is a parallel flow continuous plant used to manufacture asphalt, macadam and other forms of coated road stone, sometimes collectively known as blacktop, hot mix or asphalt concrete.
The manufacture of hot mix requires the combination of several aggregates, sands and fillers, in the correct proportions, heated, and finally coated with a binder, usually bitumen based or, in some cases, tar.
The temperature of the finished product after transport to the final destination must be high enough to be practical. Temperatures between 120 and 170 °C are common.
The drum mix plant is a modern one having all the essential features of latest generation hot mix plant to obtain quality hot mix designed for road construction, maintenance and repair works. Our plants are manufactured in a state of the art manufacturing facility with strict quality assurance plan to produce plants of global standards. Utmost care is taken to make the plant easier to operate & maintain with efficient process control systems.
Cold aggregate bins in various configurations are provided. It is fitted with individual variable speed drives underneath each bin with precision gates for regulating the flow of aggregates as per Hot Mix Design Formula.
Different sizes of aggregates and sand are collected in main conveyor belt called Gathering Conveyor and discharged in to single deck vibrating screen.
Single deck vibratory screen is a scalping screen which is provided at the discharge end of the gathering conveyor to enable rejection of any oversize material above the permissible limit before transferring it to the inclined slinger conveyor and subsequently to Thermo Drum Unit.
Slinger conveyor is used to transfer the aggregates mix to the Thermo Drum unit. A continuous measuring belt weigh bridge (load cell) is fitted in frame of slinger conveyor to weigh the total quantity of aggregate mix entering the Thermo Drum unit.
The rotating drum is fitted with different types of flights namely conditioning, showering and mixing flights. Two -Third portion of the Thermo Frum Unit is used for conditioning, drying and heating of aggregates and rest on-third is meant for coating of aggregates mix with filler and bitumen to produce a homogeneous hot mix.
“The outer shell of the THERMO DRUM will be insulated with ceramic wool for maximising thermal efficiency and cladding is done with SS / GI / Aluminium sheet”.
The burner will be capable of heating the aggregate to a temperature not less than 160 Degree Centigrade without any un- burnt fuel or carbon residue on the aggregate and reducing the moisture contents to 0.5% by weight. The drive to the dryer drum and burner pump and blower will be interlocked, so that the burner can be ignited only when dryer drum is rotating. The dryer and mixing drum will have a sweep discharge chute for giving an even and positive discharge from the side of the mixer. The dryer discharge chute will be so designed that it will discharge the material directly on the load out conveyor.
The bitumen metering and pumping system will include a skid mounted positive displacement thermic oil jacketed bitumen pump with a variable speed A.C. Motor drive. Depending on the grade of Bitumen it will be heated to between 140°C-170°C before being metered and pumped to Thermo Drum Unit for coating and mixing with aggregate and fillers (additives). Due to asphalts viscous nature, a typical bitumen pump specification will be cast iron gear pumps which are running slowly to minimize wear with hardened teeth.
A loadout conveyor in an asphalt drum mix plant carries hot mix material from the Thermo Drum unit to a truck or tipper. The loadout conveyor is an inclined belt that is heat resistant. It is fitted with hydraulically operated surge hopper at the discharge end of the conveyor which feeds the hot mix material into tippers trucks without segregation.
Mineral filler system will be provided to add the mineral filler from a hopper. A 1.5 / 2 Ton capacity hopper will be fabricated of steel plates with loading doors. A pneumatic dust and filler conveying system will include a rotary valve with variable speed AC motor to regulate the flow of fillers in the mixing chamber of Thermo Drum.
A bitumen tank stores and heats bitumen for mixing with hot aggregates in the drum mixer. Bitumen tank of 5 MT to 40 MT capacity will be provided based on capacity of Asphalt plant or as per client’s requirements. Tanks are thermally insulated on all sides and covered by SS/GI/ Aluminium sheet. The bitumen tank is equipped with a burner system to heat the bitumen up to liquid state. Bitumen Tank is connected with Bitumen Metering and Pumping Unit with valves and pipelines. The burner that comes with the tank is single phase burner capable of producing adequate heat to liquidify the bitumen in minimum time. Temperature gauge and asphalt level indicator is mounted on the tank. A thermic oil heating and circulating system is provided for keeping warm the bitumen inside pump and pipelines to maintain seamless flow of bitumen to Thermo Drum unit without clogging.
Fully automatic AC Drive Control Panel consisting of SCADA Software, Touch Screen HMI, Printer and UPS is provided for controlling and regulating the plant operation. Entire functioning of the plant will be fully automated with provision for manual over rides. A centralized control panel with off/on push buttons, indication lights/gauges will be provided inside a cabin to switch on and off any drive motor of the plant independently and with interlocking relays. An all weather and dust proof cabin having all round view and fitted with automatically closing doors is provided. Cabin have concealed wiring and is provided with lights and air conditioner. Wooden planks will be laid on the floor and suitable rubber matting will be provided for protection against electric shock.
All exposed parts of the plant shall be cleaned, treated and painted with suitable anti-corrosion protective paint conforming to relevant Indian Standards (or equivalent). Electrical equipment, power units and parts subjected to high temperatures shall be painted with special paint suitable for this purpose. Colours of the approved colour code shall be used to distinguish the units and pipelines of the plant. Electrical connections including terminal and circuit connections, components and circuit elements shall be suitably treated to prevent the growth of fungi.
A sturdy toolbox with lock and key containing the necessary tools and accessories for normal maintenance adjustment and lubrication of the plant shall be provided. Provisions shall be made for properly affixing the toolbox on the machine.
A venturi type-high efficiency wet dust collector is provided. The wet dust collector is designed to achieve the most efficient control for air pollution caused by emissions from the exhaust chimney. An exhaust fan of adequate capacity ensures effective air flow through the dryer and dust collection system. The wet collector operates on a principle of wetting the dust particles entering the exhaust gases and trapping them in water droplets, which are discharged from the system as water sludge. The dusty exhaust gas shall be drawn from the drum mixer into the venturi by the exhaust fan. At the venturi throat, the exhaust gas shall pass through a water spray introduced by nozzle. The dust particles in the exhaust stream shall be encircled by the water and wetted. Extreme turbulence in the venturi shall promote very intimate contact of the water and dust particles to ensure thorough mixing. As the exhaust gas enters the separator, the dust-laden water is removed by centrifugal action and skimmer blades. The dust-laden water is drained from the separator into a settling pond. Approximate water requirement will be about 1000 lit. with a pumping unit of 10 lpm.
Technical Specifications |
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|---|---|
| Model | Capacity |
| LDMX – 30 | 25 TO 30 TPH |
| LDMX – 45 | 30 TO 45 TPH |
| LDMX – 60 | 45 TO 60 TPH |
| LDMX – 90 | 60 TO 90 TPH |
| LDMX – 120 | 90 TO 120 TPH |
| LDMX – 150 | 120 TO 150 TPH |
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