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Paving and surface treatment of asphalt pavement - 29 Jan 2020 09:00

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A lot of preparation work takes place before the asphalt pavement is laid.

In fact, unless the asphalt is laid on existing asphalt (covering), the most influential factor in the life of the asphalt pavement is the laying under the asphalt pavement.

Proper cleaning, digging, ground compaction and basic materials require a great deal of expertise.

The substrate can be a compacted stone or an asphalt substrate with its unique formulation.

In any case, if there is no proper foundation, the service life of the pavement will be greatly shortened.

Before applying the asphalt pavement to the surface (especially if it is an existing asphalt surface), the asphalt pavement should first be prepared by spraying a thin liquid asphalt binder (thermal binder) using an asphalt dispenser.

This helps the newly laid surface form a greater bond between it and the surface beneath it.

Once the mixture reaches the construction site, it is laid using an asphalt paver and compacted with an asphalt drum.

In addition to the proper laying of asphalt, the final quality of the asphalt pavement is heavily dependent on the quality and compaction of the asphalt mixture.

The correct rolling method must be used to ensure proper compaction.

Once the asphalt mixture has been compacted in the driveway, it should be left to cure.

Asphalt mix requires at least 24 hours to cure before use.

If it does not cure for a sufficient amount of time, it will result in poor quality pavement.

Depending on the thickness of the driveway, the asphalt mixture should be compacted using a suitable roller.

After asphalt paving is completed, time and weather factors are left.

As time goes by, with the constant influence of rain, snow, heat, cold and other factors, the asphalt pavement and the surface below it will begin to slowly degrade and collapse.

Asphalt maintenance - including crack seals, pothole repairs and seal coatings - can be used to protect and extend the life of asphalt pavements that have a long life cycle.

Asphalt sealing coatings are not only a means of maintaining old asphalt, but they can also be used early in the asphalt pavement life cycle to protect and greatly extend their service life. - Comments: 0

Asphalt mixing plant meets market requirements - 26 Jan 2020 09:00

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Whether it is roads or bridges, they will definitely use bitumen during construction, so asphalt mixers are the equipment that must be used.

At present, there are many asphalt mixing companies on the market, and the types of products produced by different companies are different. Consumers must pay attention when choosing.

For asphalt mixing plants, in order to win a bigger market, it must have certain advantages in many aspects.

First of all, the advantage of the first aspect is that in the quality of the asphalt, this is very important.

In many cases, the quality of the asphalt is very important to the safety and quality of the entire project. Therefore, the asphalt used must be tested by various departments in various aspects, so that it can bring very good use effect in the process of use. .

The second is the advantage of equipment price. For buyers or users, the price will largely serve as a standard for quality comparison, and it also affects people's market purchasing power.

For producers, the price is also very important, and the benefits to the entire manufacturer are closely related. - Comments: 0

What can we do to promote the future development of the asphalt mixing plant industry? - 23 Jan 2020 09:00

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After a period of development, the demand for asphalt mixing plant in China and China continues to grow. At the same time, China's asphalt mixing plant equipment industry has also made great progress. In terms of current market share, Chinese enterprises have developed rapidly, far exceeding foreign countries. Brand.

However, for further development, we should also look for some problems from our own development status, and seek solutions, and then improve and improve.

First of all, the choice of the location of the asphalt mixing plant should consider the supply of raw materials. According to the previous construction experience, among the main raw materials of the semi-finished asphalt mixture, the highest proportion of the cost is petroleum asphalt, followed by sand and then mineral powder.

However, because the price of petroleum asphalt is only obvious, and the cost of transportation is relatively low, this factor can be ignored in the process of building a station.

However, due to the large price difference between sand and gravel materials in various regions, and the transportation cost is relatively large, when selecting the location of the asphalt mixing station, it is better to choose a place closer to the area rich in sand and gravel materials.

In addition, considering the actual production situation of the asphalt mixing plant, in the process of site selection, the area where the semi-finished products are abundantly supplied should be considered first. For example, if it is mainly for a certain expressway, it should be chosen to be located near the middle of the expressway. If it is to serve the municipal road, it should be selected in the area around the city and convenient transportation, in order to reduce transportation costs.

In addition, for the development of asphalt mixing plant equipment, we must keep up with the trend of the times, analyze the development direction of the market, and further enhance the performance of the products.

For example, existing new products combine multiple functions into one, which not only improves production efficiency, but also is more efficient and energy-saving, while also achieving green production requirements.

In the future, the requirements for the asphalt mixing plant equipment industry will be higher, not only to solve the above problems, but also to ensure product stability and technological advancement, reaching the international leading level. - Comments: 0

Asphalt mixing plant pursues higher development needs - 20 Jan 2020 09:00

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The plug valve is a kind of closing or plunger-shaped rotary valve. After rotating 90 degrees, the passage opening on the plug is the same as or separated from the passage opening on the valve body to open or close. It is widely used in oil field excavation, transportation and In scouring equipment, such valves are also required in asphalt mixing plants.

The plug of the plug valve in the asphalt mixing plant may be cylindrical or conical in shape, and in the cylindrical plug, the passage is generally rectangular; and in the tapered plug, the passage is trapezoidal.

These shapes make the structure of the plug valve light and are well suited for use as a plugging and closing medium as well as for shunting.

Since the movement between the sealing surfaces of the plug valve has a scrubbing effect, and the touch with the movable medium can be completely avoided when fully opened, it can generally also be used for a medium with suspended particles.

In addition, another important feature of the plug valve is that it is easy to get used to the multi-channel structure, so that one valve can achieve two, three, or even four different flow paths, which simplifies the piping system and reduces the valve usage. And some of the fittings needed in the equipment.

Because the plug valve of asphalt mixing station is quick and easy to open and close, it is suitable for frequent operation, and it also shows small fluid resistance, simple structure, relatively small volume, light weight, easy maintenance, good sealing performance and no oscillation. Small noise and other advantages.

When the plug valve is used in an asphalt mixing plant, it is not constrained by the direction of the device, and the flow direction of the medium can be any, which further promotes its use in the equipment.

In fact, in addition to the above mentioned range, plug valves can be widely used in petrochemical, chemical, gas, natural gas, liquefied petroleum gas, HVAC occupation and general industry. - Comments: 0

Daily maintenance of asphalt mixing plant equipment - 17 Jan 2020 09:00

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Asphalt mixture mixing equipment (asphalt concrete mixing equipment) works in open space, dust pollution is very large, many parts work at 140-160 degrees high temperature, and the working time of each shift is 12-14h, therefore, the equipment Daily maintenance is related to the normal operation and service life of the equipment. How to do the daily maintenance and maintenance of the asphalt mixing plant equipment?
Work before asphalt starter
Before starting the machine, the materials scattered near the conveyor belt should be removed; firstly, the load is started, and the load can be operated after the motor is running normally. When the equipment is under load operation, special personnel should be set to track the equipment, adjust the tape in time, and observe the running status of the equipment. See if there are any abnormal sounds and abnormal phenomena, and whether the exposed meter display is working properly.

If an abnormality is found, the cause should be identified and eliminated.

After each shift, the equipment should be inspected and maintained in a comprehensive manner; for high-temperature moving parts, grease should be added after each shift; air filter and air-water separator filter for air compressor; air compressor oil Oil level and oil quality; check the oil level and oil quality in the reducer; adjust the tightness of the tape and chain, replace the tape and chain when necessary; clean the dust in the dust collector and the debris scattered in the field , waste, keep the site clean and tidy.

The problem of patrolling the mountain from work should be thoroughly eliminated after the shift and the operation record should be made.

In order to grasp the full use of the equipment.

Maintenance work must have a persistent idea, not a one-night work, must be timely and appropriate maintenance, in order to extend the life of the equipment and maintain its production capacity.

Three-dimension and three-check work of asphalt mixing plant
asphalt mixing plant is an electromechanical integrated equipment, which is more complicated and has a harsh working environment. To ensure that equipment is less faulty, the crew must do “three diligences”: diligent inspection, diligent maintenance, and diligent maintenance.

“Three inspections”: equipment inspection before start-up, inspection during operation, inspection after shutdown.

Do a good job in equipment maintenance and regular maintenance work, do a "cross" operation (cleaning, lubrication, adjustment, fastening, anti-corrosion), manage well, use well, maintain good equipment, ensure the integrity rate and utilization rate, for maintenance The parts should be maintained in strict accordance with the equipment maintenance requirements.

Do routine maintenance work and carry out maintenance in strict accordance with equipment maintenance requirements.

During the production period, it is necessary to watch, listen to the ear, and immediately stop the maintenance due to abnormal conditions.

Maintenance and commissioning work is strictly prohibited when the equipment is in operation.

Special personnel should be monitored for key parts.

Reserve the consumable parts and study the cause of the damage.

Carefully fill in the operation and operation records, mainly record what is happening, what is happening, how to analyze the exclusion and how to prevent it, and the operation record as a first-hand information has a good reference value.

The troubleshooting during production should be calm and calm, and should not be violent. As long as you master the rules and patiently think, any faults can be solved well.

Daily routine maintenance of asphalt mixing plant
1.
Lubricate the equipment according to the lubrication schedule.

2.
The vibrating screen is inspected according to the maintenance instructions.

3.
Check for leaks in the air line.

4.
Blockage of large particle size overflow pipes.

5.
Control room dust, excessive dust will affect electrical equipment.

6.
After the equipment is deactivated, the discharge door of the mixing tank is cleaned.

7.
Check and tighten all bolts and nuts.

8.
Check the screw conveyor shaft seal lubrication and necessary calibration.

9.
Check the lubrication of the stirring drive gear through the observation hole and add the lubricating oil as appropriate.

Checked every week (every 50-60 hours)
1.
Lubricate the equipment according to the lubrication schedule.

2.
Inspect all conveyor belts for wear and damage and repair and replace if necessary.

3.
When the blade is agitating the cylinder drive device, check the oil level of the gearbox and, if necessary, inject the corresponding lubricant.

4.
Check the tension of all V-belt drives and adjust if necessary.

5.
Check the tightening of the hot lift bucket bolts, and move the adjustment grid to facilitate the entry of hot aggregate into the screen box.

6.
Check the chain and head, tail shaft sprocket or drive wheel of the hot hoist and replace if necessary.

7.
Check the draft fan for dust clogging - excessive dust can cause severe vibration and abnormal bearing wear.

8.
Check all gearboxes and add the recommended lubricants as needed when needed.

9.
Check the connection points and accessories of the tension sensor.

10.
Check the tightness and wear of the screen and replace if necessary.

11.
Check the gap of the feed hopper break switch (if installed).

12.
Check the wire and wear of all wire ropes and check the top limit switch and proximity switch.

13.
Check the cleaning of the stone powder weighing hopper outlet.

14.
The lubrication of the mining trolley drive bearing (if installed), the winch gear and the bearing of the mine door.

15.
The return of the primary dust collector check valve.

16.
The inner surface of the drying cylinder is worn by the scraping plate, the drying cylinder drives the chain splicing, the pin, the lotus wheel (chain drive), the adjustment of the drive wheel coupling of the drying cylinder, the support wheel and the thrust wheel and the friction (friction drive).

17.
Wear of the mixing cylinder blades, mixing arms and shaft seals, and adjust or replace if necessary.

18.
Blockage of asphalt spray pipe (sealing of self-flow inspection door)
19.
Check the oil level in the lubrication system of the pneumatic system and fill it up if necessary.

Monthly inspection and maintenance (every 200-250 operating hours)
1.
Lubricate the equipment according to the lubrication schedule.

2.
Check the chain and hopper and sprocket fastening and wear of the hot hoist.

3.
Replace the sealing packing of the powder screw conveyor.

4.
Clean the impeller of the induced draft fan to check for rust and check the tightening of the anchor bolts.

5.
Detect the wear of the thermometer (if installed)
6.
Wear of the hot aggregate bin level indicator device.

7.
Use high-precision temperature indicators to monitor the accuracy of the field's thermometers and thermocouples.

8.
Inspect the drying cylinder scraper and replace the heavily worn scraper.

9.
Check the burner according to the burner's operating instructions.

10.
Check the leakage of the asphalt three-way valve.

Check and maintain every three months (every 600-750 operating hours).

1.
Lubricate the equipment according to the lubrication schedule.

2.
Check the inside of the hot hopper and the wear of the discharge door.

3.
Check the damage of the screen support spring and the bearing housing and adjust it according to the geotextile manual if necessary.

Check and maintain every six months
1.
Lubricate the equipment according to the lubrication schedule.

2.
Replace the mixing cylinder blades and bearing grease.

3.
The whole motor is lubricated and maintained.

Annual inspection and maintenance
1.
Lubricate the equipment according to the lubrication schedule.

2.
Clean the gearbox and gear shaft assembly and fill with the appropriate lubricant. - Comments: 0

Problems encountered in asphalt mixer construction - 14 Jan 2020 09:00

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1 With the traditional maintenance program, the owner unit spends a lot of money on the processing of milling materials.

In the long run, the large amount of money spent on the disposal of recyclable materials is definitely not an economic solution.

The foamed asphalt flexible base layer, due to its excellent structural strength, avoids the occurrence of shrinkage cracks, and the upper asphalt concrete cover can be thinned.

Compared with the semi-rigid base layer, the foamed asphalt flexible base layer has better fatigue performance and can make the expressway have a longer service life.

If we take these factors into consideration, using cold recycling technology for road maintenance can save 20% — 40% of road maintenance costs.

2 After the construction of the traditional cement stabilized base layer, it is necessary to go through a 7-day or even 14-day health period to carry out the asphalt surface overlay.

The asphalt asphalt layer can be directly applied to the upper part three days after the construction of the foamed asphalt recycled layer.

This can greatly reduce the impact of construction on traffic.

The control of traffic during construction is often the most worrying and annoying problem for the owners and construction units during the construction process. - Comments: 0

Asphalt mixture mixing equipment - 11 Jan 2020 09:00

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Asphalt mixture mixing equipment is an essential construction machine in the highway construction industry. It is a relatively complex electromechanical integration equipment, consisting of a cold material supply system, a heating and drying system, a hot material screening system, a hot aggregate system, Powder system, asphalt system, mixing system, finished material system, dust removal system, pneumatic system and control system.

The main function of the cold material supply system, the heating and drying system and the hot material screening system is to store and store the raw materials in a certain ratio under the action of the control system; the hot aggregate system, the powder system and the asphalt system are mainly The role of the control system to weigh and transport the various raw materials required for the production of asphalt mixture; the role of the mixing system is to stir the various raw materials that have been mixed in a certain proportion;
The finished material system transports and stores the asphalt mixture under the control system; the pneumatic system is a part of the execution unit of the control system, such as the switch feeding gate and the discharging gate.

The entire production process, ie cold material supply, heating, screening, weighing, conveying, feeding, stirring and unloading, is automatically completed under the control of the control system.

Obviously, it is a complex system that is constrained by multiple links.

The mixing performance of the asphalt mixing plant, the material dynamic ratio, and the material dynamic weighing accuracy directly affect the quality of the mixture. - Comments: 0

How asphalt mixing plants work - 08 Jan 2020 09:00

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Asphalt is the primary material for road construction, and asphalt mixing is very important.

Asphalt mixture mixing equipment can produce asphalt and modified asphalt mixture and color asphalt mixture, which can be used in construction roads, airports, ports, etc.

Asphalt mixing is divided into two types of movement and fixation from the plants of the relocation method.

Because of its mobility and convenience, it is suitable for repairing low-grade highways, and it is more energy-efficient in the more remote road engineering special actions to reduce data transportation problems.

The fixed asphalt mixing plant is because the high-grade road is suitable for high-grade road construction, and requires a large amount of information. The fixed capacity of the asphalt mixing station is only to satisfy their needs, so as to improve the working efficiency.

Mobile and fixed asphalt mixture mixing equipment, its primary components are cold batching system, drying system, hot material lifting, screening, heat storage system, measuring system and mixing system, heat transfer oil heating asphalt supply system, dust removal system, products The difference between mobile storage and fixed asphalt mixing plants such as commodity storage silos and automatic control systems is based on the fact that the mixing pots need to be fixed to the concrete base to distinguish them.

The preemptive and efficient production equipment has the characteristics of uniform mixing, accurate measurement, high production efficiency, environmental protection and energy saving.

The moving and fixed asphalt mixing plant has its own advantages, and the planning of the movable mold is easier to handle. At the bottom of the box structure planning, the area of ​​the area covered by the equipment is greatly reduced.

The fixed asphalt mixing plant covers a relatively large area, but the mobile phones produced by it cannot be replaced. - Comments: 0

Method for improving production efficiency of asphalt mixing plant - 05 Jan 2020 09:01

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Before sharing with you some factors affecting the production efficiency of asphalt mixing plants, then today we will introduce how to reduce the impact of these factors, thereby improving the production efficiency of asphalt mixing plants and ensuring construction quality.

First, the first step is to improve the quality management of raw materials.

In the operation of the asphalt mixing plant, the impact of this factor is actually more critical.

Therefore, we must strictly implement the standard, purchase raw materials in accordance with the tender and fixed-point procurement methods, we must ensure the quality of raw materials, and at the same time choose the right price.

The second step that should be improved is the storage work.

It is best to harden the site where the raw materials are stacked in advance, and to lay out the drainage facilities of the set to facilitate the storage work.

In addition, it should be noted that the aggregates of different specifications should be separated and stored separately. The asphalt stacking pitch should not be too large to reduce segregation; fine aggregates and fillers must be kept dry and not damp; Ensure safety, pay attention to fire and leakage, and properly heat according to the requirements of construction technical specifications.

The third step should be noted that it is necessary to ensure a proper mix ratio.

Only in accordance with the appropriate mix ratio, in the production process of the asphalt mixing plant, the most appropriate amount of asphalt can be given to determine the proportion of the batch of each specification silo.

At the same time, we must pay attention to the observation of the silo feeding situation, timely sampling and analysis of the data, and adjust the primary distribution according to the different characteristics of the raw materials to ensure the stability and continuity of the mixing production.

The fourth place that should be noted, the operator should pay attention to the size of the screen mesh used to meet the production requirements, but also consider the influence of the angle of the vibrating screen, vibration frequency and other factors, and then choose to reduce the amount of material or Overfill, improve the grade quality of asphalt mixture and the productivity of asphalt mixing plant.

The last thing to improve is that you must be clear about your responsibilities.

According to different division of labor, determine the appropriate candidates, the management of the asphalt mixing plant and maintenance, etc., should be carried out according to a set of standards. - Comments: 0

China's asphalt mixture mixing equipment industry future development direction - 02 Jan 2020 09:00

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In order to maintain a competitive advantage, China's asphalt mixture equipment needs to continuously improve its technical level and product quality while adhering to the development trend of the industry, attach importance to brand building, and establish a sales channel suitable for itself.

The main trends of product and technology development in the future industry include: development of large-scale asphalt mixing plant, research and development of energy-saving, emission reduction, environmental protection and recycling of waste asphalt mixture equipment, automatic and intelligent control technology, and supporting components. Independent research and development and manufacturing of components.

1. Development of large-scale asphalt mixing plant: China's large-scale asphalt mixing plant mainly refers to the 4000 type & mdash; 5000 type equipment.

The mixing equipment of model 4000 and above, its technical content, manufacturing difficulty, industrial control methods and energy saving and environmental protection requirements, are not at the same level as the small mixing equipment at the technical level, and the technology to be solved with the increase of the model number The problem will be more and more complicated, and the supply of related components such as vibrating screen, dust removal system and combustion system will be more restricted.

Correspondingly, the single profit margin of large asphalt mixing plant is relatively high.

At present, China's relatively large-scale asphalt mixing plant manufacturing enterprises will put a certain amount of energy into the research and development of large-scale mixing equipment.

In 2011, the top five sales figures of China's 4000-type asphalt mixture mixing equipment manufacturers were CCCC Xizhu, LONTTO GROUP, Amman, Marini and Japanese workers.

2. Energy conservation, emission reduction and environmental protection: With the improvement of environmental protection requirements by the state, the recent development plan of China's construction machinery industry in the 12th Five-Year Development Plan also clearly sets out the development goals of low carbon, environmental protection, high efficiency and energy saving. The control of dust emission, harmful gas (asphalt smoke) emission, energy saving and consumption reduction is more and more strict, and higher requirements are put forward for the technical development of asphalt mixing plant.

At present, China's advanced asphalt mixing plant manufacturing enterprises, such as China Communications Xizhu, Nanfang Road Machinery, Deji Machinery, Malini, Anmai and other manufacturers have advocated and applied technological innovation, competition for resource recycling and energy conservation. Areas of emission reduction.

The endless stream of asphalt mixing plant has also made a qualitative leap in energy consumption and environmental protection.

3. Recycling equipment for waste asphalt mixture: research and development of asphalt mixing and mixing equipment, recycling, heating, crushing and sifting waste asphalt pavement mixture, and re-producing with regenerant, new asphalt, new aggregate, etc. Mixing into a new mixture and re-laying it onto the road surface can not only save a lot of raw materials such as asphalt and sand, but also help to dispose of waste and protect the environment.

Waste asphalt mixture recycling products will be widely used, and will gradually replace conventional models.

At present, China's leading manufacturers of waste asphalt mixture recycling equipment include Southern Road Machinery, Deji Machinery, and Fujian Tietuo.

At present, China recycles 60 million tons of asphalt annually, and the utilization rate of waste asphalt is 30%. According to the annual processing capacity of 200,000 tons of each asphalt recycling equipment, the annual demand for China's asphalt recycling equipment is 90 sets. It is expected that the end of the 12th Five-Year Plan, China Year The recycling of waste asphalt will reach 100 million tons, and the recycling rate will increase to 70%. According to the annual processing capacity of 300,000 tons of each asphalt recycling equipment, the annual demand for China's asphalt recycling equipment will reach more than 230 sets at the end of the 12th Five-Year Plan period. Only consider the special complete asphalt recycling equipment. If the asphalt mixing and recycling equipment is taken into consideration, the market demand will be higher).

As the recycling rate of waste asphalt mixture is bound to increase, China's demand for recycled asphalt mixture equipment will also grow.

At present, in the production of asphalt mixture planting equipment in China, the market share of Deji Machinery is relatively high.

4. Automatic and intelligent control technology: With the user's requirements for humanization, automation control and intelligent control of the equipment, the control system of the mixing equipment will apply a large number of ergonomic design and mechatronics technology to further improve the asphalt mixing. At the same time as the metering accuracy of the mixing equipment, the requirements for automation, intelligent control and monitoring technology are getting higher and higher.

The future control center needs to dynamically monitor all the motor reducer, discharge door, and gas path oil pipeline valves, and feedback the running status of the components in real time; with self-diagnosis, self-repair, automatic fault detection, real-time alarm function; establish equipment operation database It is used for the basis of equipment detection and maintenance; establish user database, record the measurement data of all mixing and matching times, trace back the original proportioning parameters and other functions, thus initially realize unattended automatic production and effectively improve the comfort of control of the mixing equipment. Intuitiveness and ease of operation.

5. The independent research and development and manufacture of the supporting parts, especially the core components: the core supporting parts are the foundation, support and constraint bottleneck for the development of the engineering machinery industry.

When the construction machinery develops to a certain stage, the industry's high-tech research will mainly gather on the core components such as engine, burner, hydraulic, transmission and control system.

However, with the continuous improvement of the host market for asphalt mixing plant in China, the development of core components has been somewhat inadequate. The lack of core technologies and talents has made it difficult for the core components to be controlled by people in a short period of time.

Therefore, enterprises in the industry can expand the industry chain of the industry when possible, and get rid of the shackles of foreign component manufacturers through independent research and development and manufacturing of core components. - Comments: 0


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