Asphalt Mixing Plant

Introduction to the Branch System of Asphalt Mixing Plant
1. Batching system
The modular structure and rational layout facilitate easy installation and dismantling.
There are three kinds of hoppers available for choice: 5m³, 8m³, and 15m 3. Isolation net is installed on the top of bin to prevent the entrance of large size aggregate.
The belt feeder is equipped with a shaft mounted reducing motor. Its features include compact and simple structure and low failure rate. An alarm device is fitted at the exit to signal the exhaustion of materials.
All the belt conveyors adopt jointless circular belts. They run steadily, produce low noise levels and have a long service life.
Reducing vibrating screen is installed on the entry position of feeding belt conveyor to prevent large size material from going into the drying drum. This can efficiently reduce waste and save cost.

2. Drying drum
(1) Interior structure of drying drum
The lifting blade has a scientific and appropriate design. Good end sealing and heat preserving surface layer helps improve the thermal efficiency of the drying drum.
Our drying drum is fitted with a high performance reducing motor which is connected to a supporting wheel (made of heat-resistant nylon) through universal joints. Friction makes drying drum run. The drying drum is also equipped with an elastic inflation gasket. This reduces the noise and prolongs the service life.
(2) Imported oil burner
The oil burner used is of an internationally renowned brand. The newest international flame control licensed technology is used for its construction. The oil burner is a fully automatic numerically controlled burner that uses any kind of heavy oil and residual oil produced by any refinery in China.
The advanced oil supplying system enables the heavy oil and residual oil to be atomized and burned. It can save 7-15% of oil, and the flame regulating ratio can reach 10:1.
Through the liquid crystal display screen, you can monitor and modify system parameters and see disturbance messages. All the component elements are controlled and performed by PLC, making the operation easy and convenient.
Compared to other burners, our burner has many advantages:
It adopts advanced technology and is intellectualized.
It has appropriate structure, high safety and high cost performance.
It has various features such as low consumption, low wearing, low noise and low levels of pollution.

3. Hot aggregate elevating, screening, storing and weighing system
(1) Hot aggregate elevator
Hot aggregate elevator is a chain type efficiency elevator. Matched sleeve roller chain is made of alloy steel. Among its features include steady running, friction resistance, low noise, low malfunction and long using life, etc. Meanwhile, the chain is equipped with an automatic tension device and anti-reversing electromagnetism reducing motor. All these enables hot aggregate elevator to work safely, reliably and efficiently.
(2) Vibrating screen
Our asphalt mixing plant is designed with a vibrating screen. The screen is fixed by a quick draw hook device which makes the replacement of screen more convenient.
The whole screen is connected by durable bolts and is enclosed in a dust proof cover. The dust proof cover is environmental-friendly and has a charging port and dust collecting port.
The vibrating sieve is equipped with a motor anti-phase device which prevents jumping and abnormal movement when the vibrating screen is stopping.
(3) Storage
Hot aggregate bin and continuous type charge level indicator Our asphalt mixing plant is furnished with a high-capacity hot aggregate bin which ensures the continuous discharge of finished products. The exterior of bin is covered by a heat preserving layer, which reduces heat loss, lowers fuel consumption and reduces costs.
Each hot aggregate bin is equipped with a continuous type charge level indicator which continuously displays the variation of charge levels. A thermal resistance thermo detector is installed on sandstone scraps bin to test the temperature of the sandstone. A hopper gate is specially designed to avoid blockage. The collecting bin at the end of the overflowing pipe and waste pipe provides convenient collection and transportation of the overflow and waste material.
(4)Weighing system
The equipment has three weighing hoppers:
Sandstone measuring hopper
It is a specially designed eccentric hopper which makes it convenient to open the hopper. The pressure relief pipeline helps remove what is unwanted.
Powder weighing hopper
Pneumatic arch broken device is installed on powder weighing hopper to make the discharging process smooth and fast. Through the special powder screw conveyor, powder enters into the mixer evenly and quickly, thus ensuring the quality of finished products. The frequency control measuring screw conveyor guarantees accurate measurement.
Asphalt weighing hopper
Our asphalt weighing hopper is both energy-saving and elegant. Heat conducting oil and insulating layer are used for effective heating and heating preservation. Additionally, a layer of stainless steel is placed outside the asphalt weighing hopper.
It is in cone shaped to efficiently reduce the residual asphalt and improve the measuring accuracy. An electromagnetic braking asphalt pump and one-way valve are used to help improve the weighing precision.
Asphalt is sprayed into the mixer by the asphalt pump to ensure its even distribution on the surface of aggregate. This will improve the quality of final products and reduce the mixing time.
The electrical control over-weighing testing device is installed in the asphalt mixing plant to avoid scale overflow.
Weighing module
The weighing module installed in every weighing hopper is from internationally famous brand. It is equipped with precise and reliable resistance-type stain sensors. The sensors are fully sealed and adapt to any bad environment without compromising precision.
Weighing module has an integrated structure, which removes horizontal forces and improves the weighing precision.

4. Mixing system
Mixer
The mixer has a square frame design and works in a stable and safe way.
Both the scale board and blade are made of white high chrome wear-resistant cast iron to give a long operating life.
The mixer has an overturning type charging gate, which is controlled by double cylinders, to shorten the charging time and achieve good sealing effectiveness.
The filling rate is no more than 60% to ensure that the stones and asphalt are completely mixed within a short time.
Reliable lubricating system
With an automatic lubricating system, a 380V mightiness motor is used to pump the lubricating oil to the point of lubrication. Manual lubricating can also be carried out.

5. Hot-conducting oil heating and asphalt supplying system
This device adopts a fully automatic horizontal heat conducting oil heating system (modularize transportation and installation). The imported burner has the functions of automatic ignition and monitoring. The fire of the burner can be adjusted according to thetemperature of heat conducting oil.

6. Dust removal system
(1) gravity dust collector
The collection efficiency of gravity dust collector can reach up to 80%. It can collect dust larger than 75μm, and all the powder collected in the first dust collecting can be sent to elevator by screw conveyor for re-use.
(2) bag dust collector
The locelle high pressure impulse bag dust collector is a NOMEX bag imported from America. It can work for a long time under the condition of rated high temperature.
It has a long service life and good air permeability.
It is used to collect the dust that is smaller than 75μm. Its collection efficiency is more than 99.5%, giving it a high rank in the enviromental protection index.
The control of bag is connected with a host machine.
It has a temperature protecting system.

7. Powder supply and dust recycling system
The reclaimed dust is sent to the powder collection tank by a three bladed roots blower, screw conveyor or bucket-type elevator. The reclaimed powder can be exhausted by a special screw conveyor if it is not needed. The main frame is in a state of negative pressure and sealing. This can not only avoid leakage, but also improve its performance of environmental protection.
The powder tank is equipped with an efficiency bin level indicator and there is a bag dust collector at the top of the tank.
Pneumatic hammer is installed under cone bottom of tank to prevent the cone from arching. Overpressure protection systems are installed on top of the new powder tank and recycling tank, thus avoiding the occurrence of roof collapse. Heavy powder in new tank and dust in recycling tank can be conveyed to the powder weighing hopper by screw conveyor according to proportion.

8. Pneumatic control system
The pneumatic control system is equipped with an imported or domestically famous air compressor, which can ensure a safe and reliable work process.
It is fitted with an imported electromagnetic valve. The pneumatic valve system is installed to prevent the emergence of dust and water while allowing long term operation.

9. Electrical control system and central control room
Control system is computer-controlled, and is equipped with Siemens S7 300 high performance programmable controller, PROFINET bus control technique and distributed I/O.
The control system has a reliable working performance, high degree of automation and is easy to operate.
The spacious and bright central control room is equipped with split-type air conditioner and other facilities to create a comfortable working environment for operators.