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Application Areas: Mainly used for road construction such as expressways, national highways, arterial roads, urban roads, airports, ports, water conservancy projects, bridges, etc.
Main Structure and ComponentsThe main structure consists of the following systems:
Cold Aggregate Supply System
It includes multiple cold feed bins, belt feeders, and a collecting belt conveyor, responsible for feeding aggregates into the drum steadily and proportionally.
Drum Assembly
This is the "heart" of the plant. It is a large, long cylindrical drum with a certain inclination angle, supported by riding rings and rotated at a constant speed by a drive unit. Various types of lifting flights are installed on the inner wall of the drum to lift and cascade the material, ensuring full contact with the hot gas stream and even mixing.
Burning System
It includes the burner, fuel (oil or gas) supply system, and blower fan, providing the heat source for drying and heating the aggregates.
Bitumen Supply System
It includes the insulated bitumen tank, bitumen pump, metering device, and spraying device, responsible for accurately metering and spraying the bitumen.
Dust Collection System
Due to continuous production, a large amount of dust is generated. Therefore, high-efficiency dust collection equipment, typically a baghouse filter, must be installed to capture dust generated during production and meet environmental requirements.
Finished Material Conveying and Storage System
It lifts the finished material from the drum and conveys it to the hot storage silo for temporary storage.
Control System
A modern control center, using a PLC (Programmable Logic Controller) and computer, realizes automatic control and monitoring of the entire production process, ensuring accurate proportions and stable temperature.
Mixing System
Based on the flow direction relationship between the hot gas stream and the material inside the drum, drum mixers are mainly divided into two types:
Counterflow Drum Mixer
Features: The direction of the flame and hot gas stream is opposite to the direction of material flow. The hot gas enters at the discharge end and exits at the feed end.
Advantages: High thermal efficiency and lower fuel consumption, as cold material first contacts the lower-temperature exhaust gas for preheating, preventing the bitumen from being burned at high temperatures.
Disadvantages: Bitumen fumes and dust tend to escape at the feed end, requiring higher dust sealing performance.
Parallel-flow (Co-current) Drum Mixer
Features: The direction of the flame and hot gas stream is the same as the direction of material flow.
Advantages: Material contacts the highest-temperature flame immediately upon entering the drum, resulting in fast drying and heating.
Disadvantages: If not properly controlled, bitumen can easily age at high temperatures, and thermal efficiency is slightly lower than that of counterflow type. This is the more common type currently.
Advantages and Disadvantages Analysis
Main Advantages:
Simple process flow and low investment cost: Since the expensive vibrating screen, hot bins, and weighing system used in batch type plants are omitted, the structure is simplified. The initial investment and footprint are generally smaller than those of batch type plants with the same capacity.
High production efficiency:Continuous operation with no cycle intervals results in high theoretical production efficiency.
Lower energy consumption: Drying and mixing are completed simultaneously inside the drum, making more efficient use of heat, and there is no heat loss from hot aggregate lifting as in batch type plants.
Low dust emission:During the drying and mixing process, dust generated on the aggregate surface is coated by bitumen, making it less likely to become airborne, which is beneficial for environmental protection.
Easy mobility: The overall structure is relatively compact and modular, making it more suitable for projects requiring frequent relocation.
Can be equipped with RAP and filler systems.
Main Disadvantages:
Relatively low batching accuracy: Due to continuous metering, the response to changes in aggregate gradation is less sensitive than the precise weighing per batch in batch type plants, resulting in slightly less stable mixture gradation.
Inflexible recipe change: To change the mixture type, the entire production line must be emptied, causing material waste and downtime, making it unsuitable for small-batch, multi-variety production.
Sensitive to aggregate moisture content: Fluctuations in aggregate moisture content can affect the temperature stability of the final finished product.
Bitumen prone to aging: If temperature control is poor, bitumen may be exposed to heat for a long time inside the long drum, posing a risk of aging.
Application Scenarios
Due to its unique technical characteristics, drum mixing plants have obvious advantages in the following scenarios:
Large-scale, single-variety continuous production: Such as base and surface course construction for rural roads and third-class highways, requiring long-term continuous supply of large quantities of the same specification mixture.
Mobile construction projects: Such as highway reconstruction and expansion projects, requiring equipment that can be quickly disassembled, relocated, and installed.
Projects sensitive to investment cost: When the budget is limited, drum type plants are a more cost-effective choice.
Recycled asphalt mixture production: Some modern drum mixers are designed with a special recycling ring, allowing for the convenient addition of a high proportion of Reclaimed Asphalt Pavement material, realizing the recycling of waste materials.
The working process of a drum mixing plant is a continuous “assembly line” operation.
Cold Aggregate Feeding & Metering: Cold aggregates of different specifications (stone, sand, etc.) are continuously fed from their respective hoppers via belt conveyors and are preliminarily metered according to the preset mix proportion.
Continuous Drying & Mixing: After preliminary metering, the cold aggregates and mineral filler are fed from the feed end into a long, inclined rotating drum.
Heating:At the discharge end of the drum, the burner generates a high-temperature flame, producing hot gases that heat the material either counterflow or parallel flow to the material direction, depending on the type.
Bitumen Coating:When the material reaches the predetermined temperature and moves to a specific zone within the drum, liquid bitumen is sprayed onto the hot aggregates through nozzles.
Continuous Discharging: Under the rotating action of the drum and the lifting and cascading effect of the internal flights, the aggregates, bitumen, and filler are fully and evenly mixed, and then continuously discharged from the lower end of the drum as finished asphalt mixture.
Storage & Truck Loading: The finished mixture is conveyed via equipment into a hot storage silo or directly loaded into trucks for transport.
The entire process is uninterrupted, with material entering at one end and finished product continuously flowing out from the other.
| Model | JL-C(M)20 | JL-C(M)40 | JL-C(M)60 | JL-C(M)80 | JL-C(M)120 | JL-C(M)160 |
|---|
| Capacity (t/h) | 20 t/h | 40 t/h | 60 t/h | 80 t/h | 120 t/h | 160 t/h |
| Cold Aggregate Supply System | ||||||
| Hopper Volume | 3×4 m³ | 4×4 m³ | 4×6.5 m³ | 4×6.5 m³ | 4×8 m³ | 5×8 m³ |
| Belt Capacity (t/h) | 40 t/h | 60 t/h | 80 t/h | 100 t/h | 140 t/h | 180 t/h |
| Drying System | ||||||
| Dryer Drum Size | 1000×4500 mm | 1200×5000 mm | 1500×6500 mm | 1500×6500 mm | 1800×8000 mm | 1950×9000 mm |
| Drying Capacity | 15-25 t/h | 40-50 t/h | 60-70 t/h | 80-100 t/h | 120-140 t/h | 160-180 t/h |
| Burner (Optional: Coal, Oil, Gas, Oil/Gas Dual Fuel) | ||||||
| Dust Collection System | ||||||
| Induced Draft Fan Power | 5.5 kW | 7.5 kW | 30 kW | 30 kW | 2×45 kW | 2×55 kW |
| Finished Product Silo Volume | 2 m³ | 2.5 m³ | 4.5 m³ | 4.5 m³ | 6.5 m³ | 8 m³ |
| Bitumen Temperature | 130-160°C | 130-160°C | 130-160°C | 130-160°C | 130-160°C | 130-160°C |
| Total Power | 27 kW | 57 kW | 92 kW | 100 kW | 135 kW | 180 kW |
