Installation, use and management methods of large asphalt mixing plants

As an important production equipment in construction, asphalt mixing plant has high production investment. Therefore, production is very important during use, but daily maintenance is also very important. In addition to regular maintenance, routine maintenance is also essential. The editor of Asphalt Mixing Plant shares some key points of daily maintenance and scheduled maintenance;

Current highway projects are generally large-investment projects. When carrying out actual project construction, it is very necessary to control the cost of the project. The production cost control and management of asphalt mixing stations in highway projects plays a huge role in controlling the cost of the entire highway project, because the main expenses of highway projects are concentrated on the mixing stations, and almost all the equipment used in highway projects Materials are closely related to the mixing station.

Asphalt mixing plant is one of the main equipment for producing asphalt concrete. It can mix asphalt, gravel, cement and other materials together in a certain proportion to obtain the products required for highway construction. In order to ensure its operating effect, the asphalt mixing station also needs to be powered on for trial operation before it is officially put into work.
At the beginning of the test run, first run a single motor, and at the same time check whether the current, steering, insulation and mechanical transmission parts are operating normally. After confirming that each motor and mechanical transmission parts are operating correctly, conduct a joint trial run. During the entire process, it is necessary to conduct patrol inspections of key parts. If any abnormal noise is found, the cause should be identified and eliminated in a timely manner.

Asphalt mixing plants, what role? Asphalt mixing plants, also known as asphalt concrete production equipment, is a special facility for mixing, heating, dust removal and other process treatments for raw materials such as sand, mineral powder, asphalt, etc., to produce asphalt concrete for road construction. As an indispensable role in road construction, the responsibility of the asphalt mixing plant is not only to complete the production of asphalt concrete, but also to provide solid guarantee for road construction.

In today’s road construction, the use of a large number of road construction machinery represents the entry into the era of highway mechanization. For users, the goal is to use road construction machinery reasonably and tap its potential as much as possible. However, road construction machinery requires various accessories to work together. Now let’s take the asphalt mixing plant as an example to see what commonly used accessories and equipment are available.
Asphalt mixing plant equipment is a relatively complex system, which includes many equipment, mainly nine parts, namely: bag dust removal, finished material temporary storage warehouse, grading machine, fast heating asphalt tank, asphalt barrel removal machine, asphalt recycled material crushing and screening system, coal block crusher, coal mill and dust removal equipment, etc.

Now on the construction site, including in some engineering construction, one of the equipment used is asphalt mixing plant. It can be said that it can be used in many ranges and fields, and it can provide certain help for my country’s infrastructure construction. Of course, in the process of use, it is necessary to do a good job in many aspects, so that the use of mixing plant can be safer and more worry-free.
1. Maintain standardized operating procedures
In fact, it is not only in the use of asphalt mixing plant, but also in the use of other equipment. It should be done well. It can be said that this mixing plant will also have certain dangers. If there is any carelessness, it may also cause great losses. Therefore, at this time, it is still necessary to pay attention to the correct specifications and follow the process step by step. Only in this way can it be used safely and other use problems can be effectively avoided.
2. Adjust the reasonable mixing ratio
In the application of asphalt mixing plant, the most important and core step is the mixing. The mixing ratio of raw materials should be within a reasonable range and completed according to actual needs. Do not add or reduce raw materials at will according to your own wishes. Such operation is not standardized. In addition, after making a good ratio, you should also pay attention to safety protection measures during operation.
Asphalt mixing plant still plays an important role. If you want to make the use of the mixing plant safer and more worry-free, you should pay more attention when using it and have a certain understanding of these precautions. Only in this way can you ensure that there will be no other problems in use and ensure the safety of the mixing plant.

Safety is the key point for any piece of equipment, and asphalt mixers are of course no exception. What I want to share with you is the knowledge in this area, that is, the safe operation specifications of asphalt mixers. You might as well pay attention to it.
In order to prevent the asphalt mixer from moving during work, the equipment should be placed in a flat position as much as possible, and at the same time, use square wood to pad the front and rear axles so that the tires are elevated. At the same time, the asphalt mixer must be provided with secondary leakage protection, and it can only be started after the inspection, trial operation and other aspects are qualified.

Introduction to asphalt mixing plant Asphalt is a product of petroleum distillation.
Asphalt is a dark brown complex mixture of hydrocarbons of different molecular weights and their non-metallic derivatives. It is a kind of high-viscosity organic liquid. It often exists in the form of liquid or semi-solid petroleum. The surface is black and soluble in carbon disulfide and carbon tetrachloride. Asphalt is an organic gelling material that is waterproof, moisture-proof and anti-corrosive.
Asphalt can be mainly divided into three types: coal tar asphalt, petroleum asphalt and natural asphalt: among them, coal tar asphalt is a by-product of coking. Petroleum asphalt is the residue after crude oil distillation. Natural asphalt is stored underground, and some form mineral layers or accumulate on the surface of the earth’s crust. Asphalt is mainly used in industries such as coatings, plastics, rubber, and paving roads.

The application of asphalt mixing plants also involves selection issues. In order to give full play to the performance of the equipment, the model of the machine is mainly determined according to the actual situation of the construction site. It sounds relatively simple, but some details still need to be emphasized.
The so-called specific conditions of the construction site first include the size of the site; secondly, the properties, specifications and working dimensions of the enterprise’s supporting equipment. It is necessary to try to do a good job in all aspects to help improve production efficiency and ensure product quality. In the case of intensive network management, the network management function of the asphalt mixing plant must also be taken into account to avoid difficulties in future upgrades.

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.

Asphalt mixing stations and equipment must implement secondary leakage protection measures. They can only be used after being plugged in and operated through the circuit breaker before use. During the trial operation, it is necessary to verify that the rotational speed of the mixing drum will be inappropriate.

I. The basis for the classification of asphalt mixing plant models
The models of imported asphalt mixing plants are mainly divided according to the following three aspects:
1. Production capacity: According to the size of production capacity, asphalt mixing plants can be divided into small (30-60 tons/hour), medium (60-300 tons/hour) and large (300 tons/hour or more).
2. Functional characteristics: Different models of asphalt mixing plants have different functional configurations, such as asphalt batching system, interference screening system, thermal regeneration system and asphalt storage system, etc., to meet the needs of different road construction projects.
3. Additional equipment: According to customer requirements, imported asphalt mixing plants can also be equipped with additional equipment such as environmental protection equipment, intelligent control systems, oil storage tanks, etc., which will also affect the classification of models.
II. The difference and application scope of different models of asphalt mixing plants
1. Small asphalt mixing plant: suitable for smaller-scale road construction projects, such as community or village roads. Although the production efficiency is low, it occupies a small area and is affordable.
2. Medium-sized asphalt mixing plant: suitable for medium-sized road construction, such as county and township roads. Its production efficiency is high, it has certain requirements for the quality of raw materials, and the price is moderate.
3. Large asphalt mixing plant: suitable for large-scale construction projects such as highways and airports. The production efficiency is extremely high, and the requirements for asphalt materials are also higher, but it occupies a large area and has a high price.
In summary, the selection of a suitable imported asphalt mixing plant model requires comprehensive consideration of factors such as production capacity, functional characteristics and additional equipment, and selection and purchase according to the needs of the actual road construction project.

The asphalt mixing equipment mentioned here may also refer to an asphalt concrete mixing station. At present, asphalt mixing equipment generally uses a complete set of equipment for mixing. So what are the benefits of using a complete set of equipment?
1. More effective.
In today’s industrial production, a complete set of asphalt mixing equipment can help improve production efficiency and ensure product quality. This is why even in a mixing station, the equipment used is a complete set of equipment.
2. Ensure quality.
When mixing asphalt, a certain ratio is set. For this type of asphalt liquid used in different occasions, its ratio control has strict requirements. It is necessary to determine its mixing method and mixing time to ensure that the asphalt liquid is consistent with the production site. One of the advantages of a mixing station is that the quality can be effectively controlled.
3. It can be sampled.
After mixing at the mixing station, the quality inspector can sample and inspect to ensure that the mixed asphalt liquid meets the use requirements.
In short, asphalt mixing equipment will use a complete set of equipment, mainly to facilitate the later asphalt to meet production needs. Through the mixing station, the mixing time and feeding sequence can be better controlled, so that the mixed product can meet different use requirements. And after using the archiving equipment, effective spot checks can be carried out, which can better ensure that the quality meets the construction requirements.

In the 21st century, with the booming development of modern engineering construction, complex integrated supporting equipment has been invested in large quantities. Its complex process and more independent operating components have relatively high requirements for the performance of its equipment control system. The application of PLC in asphalt mixing station realizes the control of the entire process of asphalt mixing station, which facilitates the construction of modern engineering construction. Therefore, this article discusses and analyzes the application of PLC in asphalt mixing station, which has certain economic value and practical significance.

Effective maintenance of the drying drum of the asphalt mixing plant can extend its service life and reduce the cost of use. Let’s take a look at how to maintain it reasonably.
1. The drying drum should be stopped when the aggregate is not running in the asphalt mixing equipment. After the work is over every day, the equipment should be operated to discharge the aggregate into the dryer. After closing the combustion chamber, the combustion chamber should be idle for about 30 minutes to cool down to reduce the impact or allow the machine to run automatically.
2. Install the drying cylinder fixing ring on the roller synchronously. Check the environment in the patrol ring regularly. Whether the roller is adjusted, the straight roller will automatically move to the conveying end, and then the bias will be adjusted to the correct position.
3. If the roller table is in contact with only one of the two thrust rollers, the gap sheet can be filled under the support roller until it is simultaneously subjected to the full width of the support ring. The specified nutritional state should be maintained by the thrust wheel, but it is used to compensate for the desire not to express.
4. If the drying drum is equipped with a drive device, a certain amount of power should be added in small amounts.

Due to raw materials or usage, asphalt mixing plants will be subject to a certain degree of wear or other failures during daily use. If they are not controlled or repaired in time, the problem will be further exacerbated. For asphalt mixing plants, what are the ways to prevent wear and failure?
If the asphalt mixing plant is not treated in time after being worn, it may corrode once it is in contact with air, rainwater, etc. for a long time. If the parts of the asphalt mixing plant are severely corroded, the service life and normal operation of the entire equipment will be affected.

The actual operation steps of drying drum of asphalt mixing equipment: 1. Pay attention to routine inspection; 2. Proper operation steps; 3. Effective maintenance.
Drying drum is a cylindrical device specially used for heating and drying stones in asphalt mixing equipment. Proper application and maintenance of drying drum can maximize the performance of drying drum, increase its service life and reduce application cost. Let’s take a look at the actual operation steps below.
1. Pay attention to routine inspections
The asphalt mixing equipment drying drum has been tested and inspected before leaving the factory, but it will be subjected to vibration and vibration during transportation to the construction site. A comprehensive inspection should be carried out before use: check whether all anchor bolts are tightened; whether all key pins are properly driven; whether all drive devices are adjusted according to the manufacturer’s instructions; whether all pipe connections are appropriate and whether the three-way joints are reliable; whether the entire equipment is fully lubricated; start the motor and check whether all parts can rotate steadily in the correct rotation direction; whether the pressure gauge can work normally and whether the valve is adjusted to the correct working pressure; whether the burner ignition mechanism is available and whether the gate valve is open.
2. Correct operation steps
After the equipment is started, it is recommended to control the machine manually at the beginning, and then switch to the automatic control mode after achieving the required production volume and pouring temperature. The stone should be dried and have a stable moisture content as much as possible so that the stone can maintain a stable final temperature when passing through the drying drum. If the stones delivered to the drying drum change frequently and the moisture content changes each time, the burner should be adjusted frequently to compensate for these changes.
The stones directly from the crushed stone have a relatively constant moisture content, while the stones from the outdoor storage yard have a higher moisture content, and the moisture content of different piles varies greatly. Therefore, it is best for the stones to come from the same source.

Asphalt mixing equipment is also divided into fixed and mobile types. There are still big differences between the two to a certain extent. Let’s take a look at the design of mobile asphalt mixing equipment. What advantages can bring to the equipment?

Many people think that since both asphalt mixing plants and asphalt mixing plants are equipment for producing asphalt, there should be no difference between them, even if there is, it is only in appearance and volume. However, asphalt mixing plants and asphalt mixing plants are different in even their basic structure and function.
First, let me introduce the basic structure of an asphalt mixing plant, which includes five major components: material supply system, metering system, mixing system, and electrical control system. In comparison, the structure of an asphalt mixing plant is simpler, without so many components, so its operation and maintenance will be simpler.

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.

With the changes in society and the transformation of the economy, real estate and construction are developing rapidly. When building and constructing houses, most of them use some equipment, such as mixing plants. The asphalt mixing plants produced by our company have a high level of mechanization and high production efficiency.
What is an asphalt mixing plant? It is a combined device used for centralized mixing of concrete, also known as a concrete prefabrication site.
With the development of municipal construction, the use of centralized mixing and the provision of commercial mixing plants have great advantages, so it has developed rapidly and created conditions for promoting concrete pumping construction and realizing the joint operation of mixing, conveying and pouring machinery. It is mainly composed of five major systems, including a mixing host, a material weighing system, a material conveying system, a material storage system and a control system, as well as other ancillary facilities. However, there are some faults in normal times. What are the specific ones in the gas source failure?

If you look at an asphalt mixing plant from a professional perspective, do you know how to judge its work and significance? In fact, the so-called asphalt mixing station is the one that produces asphalt. We can usually see it in road construction projects. Specifically, it mixes some materials that need to be used during the construction process according to certain proportion requirements. Then complete the corresponding construction work.
Then, we can analyze it from a market perspective. Since it was used in the market, it has been widely praised by users. Today’s asphalt mixing plant technology has been greatly improved, and the entire set of equipment used has a variety of advantages. , such as meeting the requirements of stable control, screening, efficient dust removal, excellent mixing, and green environmental protection during the work process. It is even more obvious when used in large-scale projects such as high-grade highways and airports.

In the process of building and maintaining roads, road asphalt materials are an indispensable part. Asphalt, as a binder, can be used for various surface treatments, such as roads, parking lots, airport runways, etc. However, choosing the right road asphalt material for you is not an easy task. In this article, we will discuss how to choose the road asphalt material that best suits your needs.
1. Understand the types of road asphalt materials
First, we need to understand what road asphalt materials are available. According to the material properties and their application areas, they can generally be divided into the following categories:
(1) Conventional petroleum asphalt: It is extracted from petroleum and has strong durability and viscosity. It is often used in the surface layer of highways, urban trunk roads, etc.
(2) Modular asphalt: It is obtained by mixing conventional petroleum asphalt with other materials. It has better toughness and crack resistance. It is usually used for viaducts, large airport runways, etc.
(3) High temperature stabilizer modified asphalt: By adding high temperature stabilizers, the high temperature resistance of asphalt is increased. It is usually used in high temperature areas, such as roads in southern provinces.
(4) Polymer modified asphalt: By adding polymers, the toughness, crack resistance and durability of asphalt are increased. It is usually used in large parking lots, factory areas, etc.

Due to its complexity and importance, asphalt mixing plants are more critical in road construction. Modern asphalt mixing stations have five key systems. Do you know what they are?
1. Mixing system of asphalt mixing plant
Mixing equipment is one of the key systems, why? Usually, the productivity of the mixing equipment has a great impact on the next step of construction efficiency. Most asphalt mixing plants use twin-shaft forced mixing. Since the drying drum and burner of the mixing equipment have strong overload capabilities, and in most cases, the moisture content of the mineral materials is less than 5%, this improves the productivity of the mixing equipment. provide conditions. The mixing blades of the mixer have an adjustable assembly angle and are driven by dual mixing shafts and dual motors.

Asphalt mixing stations play an important role in road construction. This article starts from the site selection, commissioning, and acceptance of the asphalt mixing plant, and elaborates on comprehensive and reasonable planning to avoid disturbing the normal construction order.

When inspecting the asphalt mixing plant, it was found that the asphalt in the pipeline solidified because the temperature of the asphalt transportation pipeline did not meet the requirements. Analysis believes that the reasons for this result are that the high-level oil tank of the heat transfer oil is too low, resulting in poor circulation of the heat transfer oil; the second is that the inner tube of the double-layer pipe is eccentric; the third is that the heat transfer oil pipeline is too long; and the fourth is that the heat transfer oil pipeline is not insulated measure.

With increasingly stringent environmental protection policies, asphalt mixing stations face severe challenges such as excessive dust and exhaust gas emissions. How to achieve standard production through efficient and environmentally friendly transformation while controlling costs? This article will reveal three core transformation plans to help mixing stations achieve a direct reduction of more than 80% in emissions, combining economy and compliance!
1. Dust control: Upgrade pulse bag dust removal system
Traditional dust removal equipment is difficult to cope with high humidity and high viscosity dust in asphalt stations, which can easily cause filter bags to compact. The transformation plan includes:
Filter material upgrade: Use oil-proof and waterproof coated filter bags, which can withstand 240℃ high-temperature asphalt flue gas and extend the service life by 2 times.
Intelligent cleaning: Equipped with a 0.5MPa high-pressure pulse backflush device, the cleaning frequency is automatically adjusted according to the pressure difference, and the dust capture efficiency exceeds 99%.
Seal transformation: Install double-layer soft curtain seals on dust-raising points such as silos and conveyor belts to reduce unorganized emissions.
Transformation effect: dust emission concentration dropped from 100mg/m3 to below 10mg/m3, which is better than the national standard.
With increasingly stringent environmental protection policies, asphalt mixing plants face severe challenges such as excessive dust and exhaust gas emissions. How to achieve standard production through efficient and environmentally friendly transformation while controlling costs? This article will reveal three core transformation solutions to help mixing stations achieve a direct reduction of more than 80% in emissions, combining economy and compliance!

When an ordinary asphalt mixing station completes the mixing operation, it will cause great pollution to the surrounding environment. In order to solve this problem, environmentally friendly asphalt mixing equipment came into being. What are the characteristics of this type of equipment?

After use, asphalt mixing equipment needs to be disassembled, cleaned, and maintained before it can be saved for next use. Not only is the disassembly process of the equipment important, but the previous preparation work also has a greater impact, so it cannot be neglected. Please pay attention to the detailed introduction below for specific content.

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.