Application and maintenance of drying drum of asphalt mixing equipment

The asphalt mixing plant is a complete set of equipment for mass production of asphalt concrete. The whole machine of the equipment consists of multiple systems, such as batching system, drying system, combustion system, powder supply system and dust prevention system. Each system is an important part of the asphalt mixing plant.
The working condition of the combustion system of the asphalt mixing plant has a great impact on the whole system, which is related to the economic efficiency of the whole system, temperature control accuracy and flue gas emission indicators. This article will briefly introduce how to judge the working condition of the combustion system of the asphalt mixing plant.
Generally speaking, due to the complexity of the detection equipment and methods, there are no conditions to achieve in the working process of most asphalt mixing plants. Therefore, it is more convenient to judge the working condition by a series of relatively intuitive factors such as the color, brightness and shape of the flame. This method is very simple and effective.
When the combustion system of the asphalt mixing plant is working, when the fuel is burning normally in the drying cylinder, the user can observe the flame through the front of the cylinder. At this time, the center of the flame should be in the center of the drying cylinder, and the flame is evenly distributed around it and will not touch the cylinder wall. The flame is full. The whole outline of the flame is relatively clear, and there will be no black smoke tail.
The abnormal working state of the combustion system includes, for example, the diameter of the flame is too large, which will cause serious carbon deposits on the furnace tube and affect the subsequent working state of the combustion system.

1. Causes of overflow
The main causes of spillage are:
1) Mixing materials in cold silo. Cold material warehouses generally have 5 or 4 warehouses. Each warehouse is required to contain pellets of a certain specification. If cold materials of different specifications are mixed or mistakenly loaded during the loading process, it will cause certain occurrences in a certain period of time. The shortage of pellets of one specification and the overflow of pellets of another specification can easily destroy the supply balance between hot and cold silos.

Asphalt mixing plants, as key equipment for producing high-quality asphalt mixtures, play an indispensable role in civil engineering. Their advanced production processes and automated features provide stable and reliable material support for construction projects. In this article, we will explore the various functions of asphalt mixing plants to effectively support your construction projects.
Producing High-Quality Asphalt Mixtures
Asphalt mixing plants utilize advanced production processes and equipment to significantly improve the quality of asphalt mixtures. Through precise proportioning and consistent mixing, asphalt mixtures are strong and durable, effectively meeting the material requirements of road construction projects. Therefore, selecting a high-quality asphalt mixing plant is crucial for ensuring project quality.
For engineering projects, pursuing high-quality materials is crucial to ensuring the sustainable development of projects. Of course, cost savings and maximizing corporate profits are also essential.
Saving Labor and Material Costs
Asphalt mixing plants feature automated production, utilizing computer control systems for automated operation. From raw material distribution to mixing, the entire process requires no human intervention.
This not only reduces labor and operating costs but also significantly improves production efficiency. It’s worth noting that asphalt mixing plants utilize thermal recycling technology, effectively reusing waste asphalt mixture and reducing the need for new materials, thereby saving material costs and effectively utilizing resources.
In the current economic downturn, reducing production costs remains a core concern for businesses. Of course, improving construction efficiency is also a benefit.
Improving Construction Efficiency
Asphalt mixing plants have a large production capacity that can meet the needs of diverse projects. Automated systems monitor and adjust the asphalt mixture production process in real time to maintain consistent quality. This not only speeds up construction and shortens project schedules, but also improves overall project efficiency.
In a highly competitive market, efficient construction often seizes opportunities and wins more orders. Furthermore, among the various advantages of asphalt mixing plants, their application range is also extensive. Let’s explore them together!

Construction safety has always been a major issue, and we cannot let any safety hazard go unnoticed. Especially the use of equipment at the construction site. Asphalt mixing stations are prone to failure. Strengthening the maintenance of this equipment is essential to ensure safe construction at the construction site, improve equipment integrity, reduce equipment failures, and ensure the quality of concrete. The role of neglect.
The composition of the asphalt mixing plant is relatively complex, so during maintenance, classified maintenance should be carried out according to the usage and functions of different parts. Maintenance content can be divided into tank maintenance, winch system maintenance and adjustment, stroke limiter adjustment and maintenance, wire rope and pulley maintenance, lifting hopper maintenance, track and track bracket maintenance, etc.

During the operation of the asphalt mixing plant, the quality of the mixture is often related to its construction quality. Therefore, we need to improve the quality level of the mixture as much as possible, and the temperature of the mixture is one of the standards for the qualification assessment of the mixture. In other words, if the temperature is too high or too low, the mixture may become waste and cannot meet the needs of use.
Therefore, reasonable control of the temperature of the mixture is one of the basic conditions that must be met for the normal production of the asphalt mixing plant. Among them, the quality of the fuel will affect the temperature of the mixture. For example, if the quality of the fuel is poor, the calorific value is low, and the combustion is incomplete, it will lead to unstable heating, low temperature, and a large amount of residue will be produced after combustion, affecting the quality of the mixture. If the viscosity is large, it will also cause ignition difficulties and the temperature is not easy to control.

Environmental protection has become a topic of great concern in modern industrial production, especially in the construction industry, which has stricter environmental requirements. Effectively managing dust emissions from asphalt mixing plants has always been a key issue. To address this issue, bag filters for asphalt plants have emerged. Bag filters improve the dust removal efficiency of asphalt mixing plants and, to a certain extent, reduce production costs.
One of the unique features of asphalt mixing plants is their multi-stage dust removal system.
This system recycles dust based on particle size, effectively ensuring the utilization of raw materials.
Recycling waste dust not only reduces production costs but also generates additional revenue for businesses.
Thus, maximizing raw material utilization while ensuring product gradation is undoubtedly a boon.
This approach not only reduces production costs but also helps customers better comply with environmental regulations, contributing to the sustainable development of their businesses. Furthermore, asphalt mixing plants equipped with bag filter systems can also meet environmental requirements.
High-pressure pulse bag filters are essential equipment in asphalt mixing plant dust removal systems.
Compared to traditional methods, high-pressure pulse bag filters remove dust more thoroughly and efficiently.
Their efficient dust removal capabilities not only meet local government environmental protection requirements but also effectively avoid environmental complaints.
The asphalt mixing plant’s flue is equipped with an over-temperature shutoff device and a cold air valve, effectively ensuring the safe operation of the bag filters. These devices effectively prevent damage to the bags due to high temperatures, further reducing the frequency of replacement parts and maintenance costs, saving customers significant money.

At present, the production efficiency of asphalt mixing plants in my country’s asphalt construction is far lower than the theoretical efficiency at the time of design. The low efficiency of organic waste gas treatment will not only delay the construction process and cause a waste of resources, but also the quality of the construction will not be very good. guarantee. In the construction of asphalt pavement, the main reasons for the low production efficiency of the asphalt plant are insufficient supply of mixture, resulting in loss of continuity of construction, improper equipment parameter settings, excessive overflow and other problems. Effective measures must be taken to deal with these problems, and ultimately improve production efficiency and ensure construction quality.

To extend the service life of the dust collector bag in the asphalt mixing plant, maintenance can be carried out from the following aspects:
Daily operation and maintenance
Control operating parameters: strictly control the operating temperature, pressure and air volume of the dust collector to avoid excessively high or low temperature, excessive pressure fluctuations and air volume overload. Generally speaking, the operating temperature of the dust collector in the asphalt mixing plant should be controlled between 120℃-180℃.
Regularly check the cleaning system: ensure the normal operation of the cleaning device, such as the pulse valve, cylinder and other components are fault-free, and the cleaning time and cycle are set reasonably. Regularly check the pressure of the pulse injection system to ensure that the injection pressure is between 0.4-0.6MPa to achieve the best cleaning effect.
Timely deal with leakage problems: Regularly check the sealing of the dust collector, promptly discover and repair leakage points in pipes, flanges, inspection doors and other parts, and prevent dust-containing gas from short-circuiting and wearing the bags.
Regular maintenance
Check the appearance of the bag: Open the dust collector inspection door regularly to check whether the bag is damaged, deformed, blocked or stuck. If a small area of individual bags is found to be damaged, they can be repaired in time; if the damage is serious, new bags need to be replaced.
Clean the surface of the bag: According to the blockage of the bag, compressed air can be used regularly for reverse blowing and cleaning, or special cleaning equipment can be used to clean the surface of the bag to remove dust.
Replace wearing parts: Other wearing parts of the dust collector, such as the filter bag frame, venturi, etc., should also be checked and replaced regularly to ensure the overall performance of the dust collector.
Storage and installation
Proper storage: Unused bags should be stored in a dry and ventilated environment to avoid moisture, rain and direct sunlight to prevent aging of the bag material.
Standard installation: When installing the bag, be careful to avoid contact between the bag and sharp objects to prevent scratches. At the same time, ensure that the bag is firmly installed and well sealed with the flower plate hole to prevent the bag from being worn or falling off due to looseness.

The mixing speed of asphalt mixing plant equipment is indeed very fast, and the corresponding mixing power must be very high, but the specific amount must be measured in a certain way to determine the scope of use of asphalt mixing equipment. There are many methods to measure the mixing power of asphalt mixing equipment, but the relatively small errors are the motor counter-torque measurement method and the strain measurement method.
When the motor of the asphalt mixing equipment starts running, the electromagnetic moment acting on the motor rotor and the electromagnetic moment acting on the motor stator are equal, but their directions are opposite. Therefore, as long as the torque acting on the stator is measured, the torque on the rotor can be obtained, and the actual mixing torque is obtained after deducting the friction torque on the rotor bearing.
On the premise of knowing the torque and mixing speed, the mixing power of the asphalt mixing equipment can be calculated. This is the so-called motor counter-torque measurement method, which is relatively simple and suitable for smaller mixing systems.

At present, the assembly and installation technology of large-scale asphalt concrete mixing equipment in high-grade highway construction is gradually improving. In order to improve work efficiency, it is necessary to analyze the pretreatment agent for the selection and matching of large-scale mixing equipment and auxiliary equipment, and clarify the installation and commissioning of asphalt stations. With the continuous change of highway construction methods, it is necessary to adopt production equipment according to the requirements of the development of the times. Intermittent asphalt mixing equipment is a widely used road construction equipment with the characteristics of simple operation and high work efficiency. Relevant staff are required to master the installation, construction and management methods of mixing equipment.

The basic working principle of the green asphalt mixing plants can be roughly summarized in the following ways:
To put it simply, an asphalt plant is actually a set of equipment that can mix several materials according to a predetermined ratio to form a relatively uniform mixture. It is currently widely used and is very important for the construction of different projects. Its performance Various aspects also have a great impact on the engineering quality of asphalt pavement.
Asphalt mixing plant equipment is usually divided into two structures. The intermittent type is relatively more complex in structure and process. The aggregates need to be screened twice and then measured in batches. The batching accuracy is higher. , the mixing quality is good and can meet different construction requirements. The continuous type has a slightly lower accuracy due to its simple structure and simplified operating procedures.

An asphalt mixing plant, also known as an asphalt concrete mixing plant or asphalt concrete mixing plant, is a set of machinery designed specifically for the large-scale production of asphalt concrete. Based on their mixing method, these plants can be categorized as forced batch and continuous production. Based on their handling method, they can be further divided into fixed, semi-fixed, and mobile types.
I. Main Application Areas of Asphalt Mixing Plants
An asphalt mixing plant, also known as an asphalt concrete mixing plant, is a piece of machinery designed specifically for the large-scale production of asphalt concrete. It can produce asphalt mixtures, modified asphalt mixtures, and colored asphalt mixtures, and is an indispensable key piece of equipment in the construction of infrastructure such as expressways, graded highways, municipal roads, airports, and ports.
II. Overall Structure of an Asphalt Mixing Plant
The key equipment of an asphalt mixing plant includes a batching system, drying system, combustion system, hot material elevator, vibrating screen, hot material storage silo, weighing and mixing system, asphalt supply system, powder supply system, dust removal system, finished product silo, and control system, among other components. These components work together to ensure efficient and high-quality production of asphalt mixtures.
III. Classification of Asphalt Mixing Plants.
(I) Based on production capacity, asphalt mixing plants can be divided into small, medium, and large categories. Small mixing plants have a production capacity of less than 40 tons/hour, medium mixing plants have a production capacity between 40 and 400 tons/hour, and large mixing plants have a production capacity exceeding 400 tons/hour.
(II) In addition, asphalt mixing plants can be divided into mobile, semi-stationary, and fixed types based on their transportation method. Mobile mixing plants have silos and mixing pots equipped with tires, making them easy to move with the construction site. They are mainly suitable for county and township roads and low-grade highway projects. Semi-stationary mixing plants have equipment mounted on trailers and assembled at the construction site. They are mostly used in highway construction. Stationary mixing plants, also known as asphalt concrete processing plants, have equipment located in a fixed location and are suitable for centralized projects and urban road construction.

Asphalt mixing equipment has a special function, which is that it can perform cyclic heating to make the asphalt product reach the best condition. But how does it achieve this function? Everyone is curious about this.

Regardless of the industry, if you want to have a promising future, you cannot ignore the concept of environmental protection. This is also true for our asphalt mixing equipment industry. Asphalt concrete mixing plants are large-scale road construction material production equipment and are an indispensable part of road construction and maintenance, accounting for a significant proportion of investment in road construction and maintenance. Although their production scope is limited to the construction site, due to their high emission density and emission standards being inferior to other engineering machinery products, the environmental pollution they cause cannot be ignored. How to reduce energy consumption and emission levels? This is not only a real problem facing our industry, but also a problem that asphalt mixing equipment manufacturers must consider.

In fact, asphalt mixing stations are not uncommon in our daily lives. They are mainly a unit of equipment specially designed to mix asphalt. What we really don’t understand is the gas system of the asphalt mixing station. Only correct maintenance And operation can bring out the best production effect. So what are the faults in the gas circuit of asphalt mixing station?
The following three points are the more common gas path failures of asphalt mixing stations:

The core of the asphalt mixing plant is its electronic control system. If it has problems, it will cause a lot of trouble to use. However, in actual use, the electronic control system in the asphalt mixing plant will inevitably encounter some problems and failures. How to solve it at this time?
If only the instrument display of the electronic control system of the asphalt mixing plant is inaccurate, it means that the weighing system may be affected by external forces; or the drift error of the sensor causes the weighing zero position or weighing interval to change; it may also be caused by sensor damage.

We know that the first priority in production is to ensure safety. In the process of operating equipment, staff must always pay attention to using the correct operating methods. Regarding the asphalt mixing plant, it is used to produce asphalt mixtures, modified asphalt mixtures, and colored asphalt mixtures to meet the needs of highways, graded highways, municipal roads, airports, etc.

Asphalt mixing plant equipment is mainly composed of batching system, drying system, ignition system, hot material lifting, vibrating screen, hot material storage bin, weighing mixing system, asphalt supply system, granular material supply system, dust removal system, finished product hopper and automatic control system.
Components:
⑴ Grading machine
⑵ Vibrating screen
⑶ Belt vibrating feeder
⑷ Granular material belt conveyor
⑸ Drying mixing drum;
⑹ Coal powder burner
⑺ Dust removal equipment
⑻ Bucket elevator
⑼ Finished product hopper
⑽ Asphalt supply system;
⑾ Distribution station
⑿ Automatic control system.

Speaking of asphalt mixing plants, we are not unfamiliar with them. This is a unit equipment specially used for asphalt mixing. In fact, what we really lack understanding of is its gas system. Even the accumulated failures that often occur in the gas system of asphalt mixing plants are not very clear. Facts have proved that only by properly maintaining the various systems of the equipment can efficient production and good benefits be achieved.
The following are four types of gas system failures that often occur in asphalt mixing plants. Let’s analyze the causes of the problems behind the failures one by one.

With the strengthening of the trend of environmental protection and energy conservation, the environmental protection of asphalt mixing plants has gradually become the mainstream form of mixing plant development. What kind of equipment can be called an environmentally friendly asphalt mixing plant? What are the basic conditions that must be met?
First of all, as an environmentally friendly asphalt mixing plant, it must meet the requirement of using less energy consumption during use. That is to say, under the conditions of the same quantity and quality, less energy is consumed during the operation process, including various resources such as water and electricity.
Secondly, environmentally friendly asphalt mixing plants not only require less energy consumption, but also must achieve higher production efficiency, while also reducing carbon emissions in the entire production process, so as to meet the proposed low-carbon production requirements

When it comes to asphalt mixing plants, I believe many people are familiar with them. Asphalt mixing plants are mainly equipment for producing asphalt concrete, they can achieve batch production and play an indispensable role in many port construction roads. Since the advantages of this equipment are very wide, there are still many precautions when using it. The following editor will briefly introduce to you what precautions are there when working in asphalt mixing plants?
1. Uniform dress
When working in an asphalt mixing plant, the staff must adopt uniform dress and customize special work clothes. If they are working outside the mixing plant or patrolling, they also need to wear safety helmets and safety protective gear. It is strictly forbidden to wear slippers to enter the workplace.
2. Warning
Before the mixing plant starts to operate, professional staff must pull the alarm to warn the surroundings. By warning, the information of starting work can be conveyed to the surrounding staff. For some irrelevant personnel, they should also stay away from dangerous places in time to avoid unnecessary accidents.
3. No open flames
When working in an asphalt mixing plant, the surrounding open flames must be extinguished and smoking is not allowed. If a problem occurs in the mixing station and maintenance is required, the maintenance personnel must wear safety belts before carrying out the maintenance.

Asphalt pavement is widely used, offering excellent performance in terms of surface roughness, driving safety, and comfort.
Fixed asphalt mixing plants were the most popular asphalt equipment for traditional road construction projects in my country. Back then, our road construction industry was in its infancy. Urban development was the first step in China’s reforms, so large-scale road construction projects were carried out across the city, and fixed asphalt mixing plants were the primary choice.
However, with the development of cities and the increasing maturity of municipal road construction, asphalt plant projects began to shift to surrounding areas and smaller cities. For construction contractors, asphalt mixing plants must operate outside their local area. If fixed asphalt mixing plants were still chosen, transportation, management, and time consumption would become increasingly high. This is why a variety of mobile asphalt mixing plants are increasingly being used for home projects.

Mechanism to avoid asphalt damage in asphalt mixing plant
1. Asphalt operators should undergo physical examination. Anyone suffering from conjunctivitis, skin disease or allergic reaction to asphalt should not engage in asphalt work.
2. Asphalt operators must apply protective ointment on exposed parts of their skin, and a first aid kit should be provided on the construction site.
3. The factory uniforms and protective equipment of asphalt operators are stored in a centralized manner and are prohibited from being worn home or entering collective dormitories.
4. The transfer of lumpy asphalt should usually be carried out at night and on cloudy days, especially during hot seasons. Small machinery should be used for loading and unloading, and it should not be lifted and transported directly by hand.

The quality of the asphalt mixing plant will be a key factor affecting the quality of the project. After reviewing relevant materials related to the production and construction of asphalt concrete, we summarized some cases of failures in asphalt concrete mixing stations during construction and analyzed the reasons.
1. Unstable output and low production efficiency of asphalt mixing plants
(1) Improper proportioning. The mix ratio of asphalt concrete is divided into target mix ratio and production mix ratio. Among them, the target mix ratio controls the cold material transportation ratio of sand and gravel materials, and the production mix ratio is the mixing ratio of various types of sand and stone materials in the finished asphalt concrete materials specified in the design. The production mix ratio is determined by the laboratory, which directly determines the off-site grading standard of the finished asphalt concrete. The target mix ratio is set to further ensure the production mix ratio, and can be adjusted appropriately during production according to the actual situation. When the target mix ratio or the production mix ratio is not appropriate, the stones stored in each measurement of the asphalt mixing station will be disproportionate, with some overflowing and some other materials, unable to be weighed in time, and the mixing cylinder will be idling, resulting in reduced output.

The drying cylinder is a cylindrical device in asphalt concrete mixing equipment specifically designed for heating and drying aggregates. Proper use and maintenance of the drying cylinder can maximize its performance, extend its service life, and reduce operating costs. Below are the specific operating methods.
1. Emphasize Routine Inspections
The asphalt mixing equipment drying cylinder has been tested and inspected before leaving the factory, but it will be subjected to bumps and vibrations during transportation to the construction site. A comprehensive inspection should be performed before use: check if the bolts are tightened; if the key pins are reliably driven in; if the drive unit is adjusted according to the manufacturer’s instructions; if the pipe connections are correct and the pipe joints are safe and reliable; if the entire machine is thoroughly lubricated; start the motor and check if the machine parts can rotate smoothly in the correct direction; if the pressure gauge is working properly and the safety valve is adjusted to the correct pressure; if the burner ignition mechanism is working properly and the valves are open.
2. Correct Operating Methods
After starting the machine, it is recommended to operate the equipment manually at the beginning. After reaching the specified production capacity and unloading temperature, then switch to automatic control mode. Aggregates should be dried and have a consistent moisture content to maintain a constant temperature as they flow through the drying drum. If the aggregates supplied to the drying drum change frequently, and the moisture content of each batch varies, the burners should be adjusted regularly to compensate for these variations.
Aggregates directly from crushed stone have an almost constant moisture content, while aggregates from open stockpiles have a higher moisture content, and the moisture content varies greatly between different stockpiles. Therefore, it is best to source aggregates from the same source.

Asphalt mixing plant refers to a complete set of equipment used for batch production of asphalt concrete. Its main function is to produce asphalt mixture, colored asphalt mixture, etc., and has been widely used in road construction. However, during the production process of asphalt mixture, pollutants such as noise, dust, and asphalt smoke will be produced, seriously polluting the environment and threatening the health of workers. Therefore, under the current background of building a resource-saving and environment-friendly society in our country, it is very important to save energy and reduce consumption during the use of asphalt mixing plants. The following article mainly starts from the three factors that affect the asphalt mixing plant, and explores the energy saving and consumption reduction measures of the asphalt mixing plant, aiming to reduce the cost of asphalt production and improve the efficiency of the asphalt plant.

The drive unit is one of the important components of the asphalt mixing plant, so whether it can be reliably operated must be highly valued to avoid adverse effects on the entire asphalt mixing plant. In order to ensure that the drive unit in the asphalt mixing plant is indeed complete and reliable, the following maintenance measures are essential.
The first thing to pay attention to is the universal rotating part of the drive unit of the asphalt mixing plant. This part has always been a fault-prone part. In order to reduce the occurrence of faults, grease should be added on time, and the wear should be checked frequently, and repaired and replaced in time. Users should also prepare the universal shaft assembly to avoid affecting the working process of the entire asphalt mixer.
Secondly, the cleanliness of the hydraulic oil used in the asphalt mixing plant must be ensured. After all, the working environment of the equipment is relatively harsh, so it is necessary to prevent sewage and mud from entering the hydraulic system. The hydraulic oil should also be replaced regularly according to the requirements of the manual. Once water or mud is found mixed in the hydraulic oil during inspection, the hydraulic system should be stopped immediately to clean the hydraulic system and replace the hydraulic oil.
Since there is a hydraulic system, of course, a matching cooling device is also required, which is also an important focus in the drive system of the asphalt mixing plant. To ensure that its function can be fully exerted, on the one hand, the hydraulic oil radiator should be cleaned regularly to prevent the radiator from being blocked by cement; on the other hand, the radiator electric fan should be checked to see if it is running normally to prevent the hydraulic oil temperature from exceeding the standard.
In general, as long as the hydraulic oil of the asphalt mixing plant drive device is kept clean, there are generally few faults; but the service life varies from manufacturer to manufacturer, so pay attention to its alkalinity observation and replace it in real time.

When using the asphalt mixing plant, you should regularly check the fuel pressure regulating valve or pressure reducing valve to determine whether the surface of the locking nut on the adjustable bolt is clean and removable; if the surface of the screw or nut is too dirty or rusty, it needs to be repaired or Replace the regulating valve.
Check the oil pump regularly to determine whether the sealing device is intact and whether the internal pressure is stable, and replace any damaged or leaking sealing devices. When using hot oil, check whether all oil pipes are well insulated. The filter installed between the oil tank and the oil pump must be cleaned regularly and checked for excessive wear to ensure that the fuel reaches the oil pump smoothly from the oil tank and to reduce the possibility of potential component failure.