Asphalt drum mixer, as the core component of asphalt batching plant, affects the quality and production efficiency of asphalt mixture. Based on the specific needs of customers, LUTON GROUP designs the most suitable mixing equipment for each drum asphalt mixing plant. Aiming to provide a comprehensive, efficient and smooth asphalt production process for global asphalt plant users.
Excellent Mixing Performance
Efficient and Stable Production
Easy and Smooth Operation
Friendly To Environment
Characteristics of Asphalt Drum Mixer
- Excellent Mixing Effect
The mixing blades or arms of the drum mixer can fully mix asphalt and aggregates, ensuring the uniformity of the mixture.
- High Production Efficiency
The asphalt drum mixer adopts a continuous mixing method, which can complete the preparation of a large amount of mixture in a short time.
- Energy Saving And Environmental Protection
The heating device of drum mixers usually adopts efficient and energy-saving design to reduce energy consumption. At the same time, the optimized mixing process reduces exhaust emissions and environmental pollution.
- Easy To Operate
The control system of the drum mixer usually adopts advanced automation control technology, which is easy to operate and master.
Composition of Asphalt Drum Mixer
An asphalt drum mixer mainly consists of a drum, a driving device, a feeding and discharging device, a heating device, as well as a control system. The drum is the main part of the mixer, usually made of welded steel plates, with spiral blades or mixing arms inside, used for mixing asphalt, aggregates and other materials. The driving device moves the drum to rotate through components such as motors and reducers, achieving the mixing function. The inlet and outlet device is responsible for the feeding and discharging materials and mixture. The heating device is used to maintain the temperature inside the drum, ensuring that asphalt and aggregates are mixed at an appropriate temperature.
Drum Body
The drum body is the main structure of the asphalt mixing system. It is usually designed in a cylindrical shape, and its diameter and length are determined based on the model and production capacity requirements of the mixer. For example, in some large asphalt mixing plants, the diameter of the drum may reach 3.0m or larger. And the length may be adjusted as needed.
The drum body is usually made of high-quality steel with high wear resistant and temperature resistant. It ensured the mixer body a stable performance under long-term and high load working conditions.
Blades
The blades are key components inside the asphalt mixing drum, which are installed on the inner wall of the drum and rotate to achieve material mixing and stirring.
The shape, quantity and distribution of blades may vary depending on the design of the mixing drum. But the common goal is to ensure that the material is evenly and thoroughly stirred inside the drum.
The material of the blades also needs to be with wear resistance and high temperature resistance, to cope with high temperature and friction during the asphalt mixing process.
Shafts And Bearings
The shaft is a key component that connects the drum body and the driving device. It bears the full weight of the drum body and materials, and drives the drum body to rotate through the driving devices.
The bearing are installed on the shaft to support the rotation of the shaft, reduce friction and wear, and ensure the smooth operation of the drum body.
The material and manufacturing accuracy of the shaft and bearings will directly affect the service life and mixing effect of the mixing drum.
Drive Device
The driving device is the power source of the mixing drum, usually composed of an electric motor, a reducer, etc. They drive the drum body to rotate through the driving shaft.
The power and speed of the driving device are designed according on the model and production capacity requirements of the asphalt mixing drum to ensure efficient and stable operation of the mixing drum.
Heating Device
The heating device is an important component of the asphalt drum mixer. It is used to heat the inner of the drum body and ensure that the asphalt mixture to maintain an appropriate temperature (120-170℃) during the mixing process.
Heating devices usually use fuel or gas as the heat source. The design and control accuracy of the heating device will directly affect the temperature and mixing effect of the asphalt mixtures.
Heating Method of Asphalt Drum Mixer
- Burner Heating
Principle – The high-temperature flame or hot air flow generated by the combustion of fuels (such as coal, fuel oil, natural gas, etc.) through a burner directly or indirectly heats the air and materials inside the drum.
Features – High heating efficiency, flexible temperature control, suitable for various scales and types of asphalt mixing plants.
- Coal Heating
Principle – A traditional heating method that generates heat by burning coal to heat the materials inside the drum.
Features – Low cost, suitable for areas with limited economic conditions.
Attention – Coal fired heating causes significant environmental pollution, and installation and maintenance are relatively complex.
- Coal To Gas Technology
Principle – Using coal powder and air as raw materials, artificial gas is synthesized in a specially designed gasifier. High temperature gas is transported through gas pipelines to the burner, where it meets the combustion air and begins to burn. The aggregates in the drying drum of the asphalt mixing plant are dried and heated.
Features – Economic and environmentally friendly, with significant promotional value.
Counter Flow Heating
Principle – The flow direction of the material and the hot air flow is opposite, that is, countercurrent heating. This heating method can effectively dehydrate materials and improve heating efficiency.
Features – High heating efficiency, sufficient heat exchange, suitable for large asphalt mixing plants.
When choosing a heating method, it is necessary to comprehensively consider factors such as local climate and weather conditions, asphalt quality and processing requirements, economic conditions and environmental protection requirements, in order to choose the most suitable heating method.
Unloading System
The unloading system usually includes components such as the unloading door, unloading slide, conveyor, etc., which are used to smoothly discharge the asphalt mixture from the mixing drum and transport it to the designated position.
Unloading Door
The discharge door is usually located at the bottom of the asphalt mixing drum, and the mixture is discharged through the door.
Regarding as the sealing and durability, the unloading door is designed to ensure that the asphalt mixture will not leak during the unloading process.
The opening and closing of the discharge door is achieved through mechanical, electric or pneumatic devices, depending on the design and requirements of the asphalt mixing plant.
The discharge chute is usually designed with a certain inclination angle to allow the mixture to flow naturally onto the conveyor.
The conveyor can be a belt conveyor, chain plate conveyor, etc., and the specific selection depends on the scale and production capacity requirements of the mixing plant.
Dust Removal System
The dust removal system is used to reduce dust pollution generated during the mixing process, protect the environment and the health of operators.
The dust removal system usually includes components such as dust collectors, air ducts, and fans, which collect and treat the dust generated during the mixing process through negative pressure suction.
In summary, all these parts working together will ensure the efficient and stable operation of the asphalt drum mixer, as well as high-quality asphalt mixture for the asphalt mixing plant.
What Is The Counter Flow Asphalt Drum Mixer
The counter flow asphalt drum mixer is a special mixing equipment, which is mainly reflected in the flow direction of materials and hot air flow.
Working Principle
In the counter flow asphalt drum mixer, materials enter from one end of the drum and move in the opposite direction to the flow of hot gas. Inside the drum, materials and hot air flow in opposite directions, forming a “counter flow”.
In this process, heat is transferred between the material and the hot gas, thereby uniformly heating the material.
The counter flow asphalt drum mixer achieves the goals of fast drying speed, uniform drying, and low energy consumption by optimizing the flow of materials and hot air in the drum. It plays an important role in counter flow asphalt mixing plants that require efficient drying and heating.
