Maintenance

Routine maintenance is crucial to ensure the operation of bag filter dust collectors are long-term, efficient, and stable. The key points for routine maintenance from D&G Machinery are as follow: 1. Enhance operator training. Operators should be familiar with the principles, performance, and operating conditions of the bag filter dust collector, and fully understand the ways of adjustment and repair.2. Pay attention to the maintenance of mechanical components. Mechanical moving parts such as reducers and ash handling devices should be regularly lubricated and changed according to regulations. Abnormalities should be promptly addressed.3. Oil-water separator maintenance. The oil-water separator in the gas tank and the air source triplet should be drained of pollutants once per shift. The oil-water separator should also be cleaned every 3 to 6 months. Regular check for the oil levels of the oil mist lubricator must be conducted, which should be topped up promptly.4. Electromagnetic pulse valve maintenance. Any malfunction of the electromagnetic pulse valve should be addressed in time. If impurities or moisture are found inside, they should be cleaned up, and damaged diaphragms should be replaced in a timely manner.5. Precautions for dust discharge device. The device must keep on running during normal operation of the dust collector, or the dust hopper will quickly be filled up with dust that overflows into the bag chamber, forcing the dust collector to stop.6. Dust cleaning control. If a timed dust cleaning controller is used, the accuracy of the cleaning cycle should be regularly measured and adjusted as needed. If a pressure-based pulse controller is used, check the operation of the pressure switch and the blockage of the pressure port. In the case of clog, clean immediately.7. Startup and shutdown procedures. During startup, compressed air should be connected to the gas tank, the control power on, and the dust discharge device activated. If there are other devices in the system, downstream equipment should be started first. After the process system has stopped, it is essential that the bag filter dust collector and exhaust fan continue to run for a period of time so as to ensure the removal of moisture and dust from the equipment. Note that when shutdown, the dust collector must be repeatedly cleaned (manually if needed) to remove dust from the filter bags and prevent moisture from causing clogging. The compressed air supply does not need to be cut off during shutdown, especially when the fan is working, so that the lifting valve cylinder is supplied with compressed air and remains in the open position.8. Parameter monitoring. The process parameters of the bag filter, such as flue gas volume, temperature, and concentration should be measured periodically. Any abnormalities should be investigated and promptly addressed. Above are the key steps for routine maintenance of bag filter dust collectors, which must be carefully executed to guarantee the continuous and efficient operation of the dust collector, maintain a clean and safe production environment, extend the service life of the equipment, so as to ensure the smooth progress of the project and bring more economic and environmental benefits.

The paving temperature of asphalt concrete should be adjusted according to the ambient temperature changes. Generally, the normal construction temperature should be controlled at no lower than 110-130℃, while not exceeding 165℃. Below precautions for asphalt concrete paving:1. Inspect the lower supporting layer.2. Confirm the mix ratio of asphalt mixture, including determining the mix proportion of aggregate and the amount of asphalt.3. Use intermittent mixer for asphalt mixing.4. Transport asphalt with waterproof, heat preservation, and anti-adhesion measures.5. Pave at a temperature of no lower than 110 -130℃. Work with two to three pavers for continuously and evenly paving.6. Roll with 2-3 rollers. The temperature after rolling should be no lower than 65℃. The rolling process consist of initial rolling, secondary rolling, and final rolling. Use mist spraying to prevent sticking.7. When spraying water on the roller during construction, pay attention to controlling the amount of spraying to prevent the dropping of mixture temperature. Use a mist sprayer. At the joint of the mixture or where hot and cold materials overlap, adopt cross-joint rolling.8. Conduct inspections all the time during construction.9. Open traffic when the temperature drops to 65℃ after rolling.10. Do not use unqualified raw materials for road construction. Enhance the testing of mixture ratios with strict on-site inspection and indoor testing. This includes temperature testing and recording at the mixing plant and construction site, which contains but not limited to Marshall tests, extraction tests at specified frequencies, pavement dimension records, as well as the testing of pavement thickness, compaction, and flatness.11. Strengthen the management and analysis of inspection data to ensure engineering quality. This includes the condition of the stockyard, daily mixing records, daily construction site records, determination and feedback of inspection data, daily engineering quality indicator charts, dynamic analysis of engineering quality and more.12. Set up clear signages for the initial rolling, secondary rolling, and final rolling sections so that it would be easier for drivers to recognize. Dedicated positions should be set up to inspect the loose paving thickness, rolling order, rolling times, rolling speed, and rolling temperature.13. Strictly control the rolling temperature and times to prevent over-rolling, or it may result in too high density or too low void content. Apart from above, a reliable asphalt mixing plant and crushing equipment are also of great importance to the good paving. With rich experience and leading technology in the road construction industry, D&G Machinery is dedicated to provide you with customized solutions. If you need any help, do not hesitate to contact us.

For asphalt pavement construction in winter, we need to follow a series of precautions. These suggestions not only meet market requirements, but also help ensure construction quality and extend the service life of roads. 1. Temperature monitoring and management1) Ensure that the temperature of the air and bitumen is within the allowable range of the engineering specifications. Usually, the air temperature should be higher than 5℃, and the factory temperature of the asphalt mixture should not be lower than 150℃.2) Use insulation facilities such as heaters or insulation materials to maintain the temperature of the mixing equipment. 2. Material selection and storage1) Use asphalt mixture that has been specially treated or modified with additives to enhance its performance under low temperature conditions.2) Ensure that all construction materials such as bitumen and aggregate are properly insulated and stored in a dry, well-ventilated area. 3. Construction time planning1) Choose a time of day with higher temperatures for construction, avoiding the cold period after sunset.2) Shorten the construction period and reduce the exposure time of materials at low temperatures. 4. Mixing and transportation1) During the mixing process, make sure to mix evenly at a proper temperature.2) Tidy up the carriage before loading. During transportation, prevent the mixture from sticking to the bottom of the carriage, which should be coated with anti-adhesive or release agent.3) Ensure that the mixture is not affected by sudden braking, sharp turns, or bumps during transportation. 5. Paving and rolling1) Use a vibratory tamper with a high frequency to ensure that the density meets the requirements.2) Use a small-tonnage roller for initial rolling, avoiding the use of rubber-tired rollers.3) Avoid opening the traffic before the road temperature drops to 50℃. 6. Quality inspection and control1) Conduct more Marshall tests for molding and ensure their authenticity and reliability.2) Carry out more on-site drill core samplings and ensure their quality, focusing on inspecting indicators such as the density and porosity of the asphalt mixture. 7. Safety and environmental protection1) Check mechanical equipment regularly to ensure its normal operation, and strengthen safety management on the construction site.2) Set up obvious safety warning signs and safety protection facilities.3) Control the emission of construction noise, wastewater and exhaust gas, so as to minimize the impact on the surrounding environment. 8. Other precautions:1) Strengthen the connection with local meteorological department, in order to understand the weather changes and take measures in a timely manner.2) Pay attention to the temperature change of the mixture to prevent abnormalities.3) Enhance the management and supervision of the construction site to ensure the effective implementation of various measures.4) Strengthen communication and coordination with relevant government agencies to ensure smooth construction.  In conclusion, the construction of asphalt pavement in winter calls for special attention to issues such as quality, safety, and environmental protection. Bearing the suggestions in mind, it is possible to effectively complete the task of asphalt pavement construction under severe winter conditions.

The maintenance of asphalt mixing plant plays a vital role in ensuring the normal operation of the equipment and extending the service life. Below some key points for maintenance of asphalt mixing plants:   1. Daily Inspection: Regularly inspect various parts of the equipment, including mixing tank, vibrating screens, conveyor belts, dust collectors, to make sure the normal operation and less damage.   2. Cleaning and Maintenance: Clean the equipment on a regular basis, remove accumulated asphalt and debris to keep the equipment clean and hygienic. Pay special attention to the dust collector cleaning to ensure it is working properly.   3. Lubrication Maintenance: Regularly add lubricating oil or grease to the lubricating parts of the equipment to make sure the normal operation of the friction parts of the equipment and prevent damage caused by friction.   4. Regular Maintenance: Conduct comprehensive maintenance of the equipment on a regular basis, including checking and replacing wearing parts, adjusting the working parameters of the equipment, and ensuring the performance and accuracy of the equipment.   5. Safety Inspection: Carry out regular safety inspections to ensure the safe operation of the equipment. Check the electrical system, pneumatic system, hydraulic system, etc. to guarantee their normal operation, safety and reliability.   6. Train and cultivate maintenance personnel: Ensure that equipment maintenance personnel have the necessary skills and knowledge to operate and maintain the equipment correctly.

Asphalt mixing plant staffing varies depending on the size and operational needs of the site. Generally speaking, the following types of personnel are required:   1. Plant Manager: Responsible for the daily management and operational decision-making of the entire asphalt mixing plant. 2. Operator: Responsible for the equipment operation and control of the asphalt mixing plant, relevant operating certificates are needed. 3.Maintenance Personnel: Responsible for equipment maintenance and fault repair of asphalt mixing plant, relevant work experience and skills required. 4. Safety Management Personnel: Responsible for the safety management and safety training of asphalt mixing plants, a good understanding of relevant safety regulations and operating procedures required. 5.Quality Inspectors: Responsible for product quality inspection and supervision of asphalt mixing plants, need to have relevant quality control knowledge and skills. 6. Purchasing and warehouse management personnel: Responsible for material procurement and warehouse management of asphalt mixing plants, need to master relevant logistics and material management knowledge.   Other relevant personnel can also be arranged as per actual needs, such as mechanic, material manager, canteen staff. When selecting personnel, it is necessary to select personnel with corresponding abilities and qualifications based on job responsibilities and requirements to ensure the normal operation and management of the asphalt mixing plant.

Regarding asphalt mixing plant operation, the cost can be cut while the efficiency lifted with the following measures:   1. Equipment System Retrofitting: Retrofit the equipment system to reduce operating costs. For example, the combustion system can be transformed into a low-pressure atomized heavy oil combustion system to improve fuel utilization and reduce fuel costs. In addition, the modification of thermal oil heating can also reduce operating costs. 2. Stockyard Management: Plan the stockyard properly to cut transportation costs. Choose appropriate raw material suppliers to ensure the quality and supply stability of raw materials. 3. Production Management: Formulate reasonable production plans to reduce equipment idling time and energy consumption. Strengthen the daily maintenance of equipment so as to extend its service life and cut maintenance expenses. 4. Upgrade Product Design: The updated product design would bring about less raw material (sand, stone etc.) waste, lower production costs, with product quality and competitiveness lifted. 5. Enhance Operator Skills: Provide operators with more training to enhance their equipment operating and maintenance skills, so as to reduce equipment failures and accidents while improving production efficiency.  6. Introduce New Technologies: Introducing new technologies and equipment would result in higher production efficiency and product quality, as well as lower production costs.

In response to the dust problem arisen from the daily operation of asphalt mixing plant, the following measures can be considered:Install dust collection equipment: Install dust collection hood at the discharge port of the mixer. The hood is semi-closed, which can significantly reduce the overflow of asphalt smoke.  Dust collection devices can also be installed in other equipment and areas that may generate dust, such as cold feeders and belt conveyors.Water spraying: Use a water spraying system to reduce dust during  mixing. As for this system, nuzzles can be installed at appropriate locations to spray water mist, suppressing the dispersion of dust.Seal equipment and pipelines: Equipment and pipelines that may generate dust can be sealed to reduce dust leakage. For example, install sealing covers on cold feeders, belt conveyors, or seal pipelines.Dust collection and treatment: Set up dust collection equipment such as dust collectors and dust collection tanks to collect and process generated dust so as to avoid pollution.Strengthen cleaning and maintenance: Clean equipment and areas regularly, remove accumulated dust in a timely manner, and maintain normal operation of equipment and dust control.These measures can effectively reduce the dust generated by asphalt mixing plants, while protecting the environment and the health and safety of workers. Below the main types of dust collection equipment for dust control in asphalt mixing plants:1. Cyclone dust collector: Cyclone dust collector is a device that uses centrifugal force to separate dust, which is suitable for handling dust with larger particle sizes. In asphalt mixing plants, this filter is often used to handle dust generated by equipment such as cold feeders and belt conveyors.2. Bag filter: Bag filter is a device that uses filter bags to filter and separate dust. It is suitable for handling dust with smaller particle size. In asphalt mixing plants, bag filters are usually adopted to deal with the asphalt fume generated at the discharge port of the mixer.3. Electrostatic precipitator: An electrostatic precipitator is a device that uses an electric field to collect and separate dust. It is suitable for processing gases with high temperature, high humidity, and high dust content. In asphalt mixing plants, electrostatic precipitators are frequently used to treat asphalt fumes emitted from chimneys.4. Wet dust collector: Wet dust collector uses water film to collect and separate dust, suitable for processing gases with high humidity and high dust content. In asphalt mixing plants, wet dust collectors are often adopted to handle dust generated by equipment such as cold feeders and belt conveyors.

In terms of asphalt mixture quality control, below some common measures:1. Selection of Raw Materials: Premium raw materials are the key to quality asphalt concrete. High-quality asphalt raw materials that meet national or industry standards should be selected to ensure that their physical properties and chemical composition meet the requirements.2. Detection and Analysis: Necessary detection and analysis of raw materials, including appearance, density, viscosity, softening point, penetration, solubility and other indicators. Through laboratory testing and analysis, the quality of raw materials is guaranteed to be stable.3. Production Process Control: Strictly control the production process, making sure the asphalt production process meets the standards and requirements, including the control of temperature, mixing time, mixing speed and other parameters, as well as the dosage and order of additives.4. Quality Monitoring: Establish a sound quality monitoring system to monitor and record key steps in the production process, such as raw material purchase inspection, production process monitoring, finished product inspection to ensure that the quality of asphalt in line with the requirements.5. Product Inspection: Carry out necessary inspections on the asphalt products, including the inspection of appearance, physical properties, chemical composition and other indicators. Through laboratory testing, the quality of asphalt products is guaranteed.6. Quality Management System: Establish and implement a quality management system, including quality control plans, quality document management, quality training, etc. Improve the stability and controllability of asphalt quality via standardized management and operation.7. Continuous Improvement: Regularly assess and analyze asphalt quality control, sum up experience and draw lessons, so as to continuously optimize these measures, and improve the stability and reliability of asphalt mixture quality. Apart from the common measures, some further information and methods can also be considered regarding asphalt mixture quality control:1. Standards: Understand and abide by relevant national, industry and technical standards, which specify the quality requirements and test methods of asphalt in detail. 2. Supplier Management: Choose reliable suppliers and establish long-term cooperative relationships. Evaluate and audit suppliers to make sure they can provide raw materials that meet the requirements, and establish a supplier quality management system.3. Defective Product Handling: Set up a defective product handling mechanism to promptly process and track the nonconforming product products, analyze the reasons and take measures to prevent similar problems.4. External Certification and Audit: Obtain quality management system certification through a third-party certification body, such as ISO 9001 quality management system certification. Internal and external audits can be carried out regularly to ensure the effectiveness and compliance of the quality management system.5. Technology R&D and Innovation: Pay attention to the latest technology and R&D achievements of the industry, actively participate in technical exchanges and cooperation in order to refine asphalt quality control with technological innovation.With comprehensive application of these methods, the quality of asphalt mixture would be effectively controlled, while the stability and reliability of the product could be further improved.

It is essential to check the safety hazards of asphalt mixing plants. Below some possible safety hazards for your reference:1. Equipment safety: Check whether the mixing equipment, conveying equipment, electrical equipment, etc. are in normal operation, and whether there are problems such as damage, aging or leakage.2. Operation specification: Check whether the operator is operating according to the specification, and whether there is any illegal operation or improper operation.3. Protective facilities: Check whether necessary protective facilities are equipped, such as safety fences, protective nets, safety signs to ensure the safety of the work area.4. Hazardous goods management: Check whether the storage, use and handling of hazardous goods comply with relevant regulations, such as asphalt, solvents.5. Fire safety: Check whether the fire-fighting facilities are in good condition and effective, whether the fire-fighting exits are unblocked, and whether the fire extinguishers are regularly inspected and maintained.6. Staff training: Check whether the staff have received the necessary safety training, and whether they understand the emergency plan and safe operation procedures.7. Environmental protection: Check whether the discharge of waste water, waste gas, noise and other environmental pollutants meets the relevant standards, and whether corresponding control measures have been taken.

1、Upper and lower overrun switch.2、Upper maintenance switch of  the hot storage bin.3、Emergency stop switch of   the hot storage bin control cabinet 4、Trolley stop switch of operation console .

1、an electronic over temperature switch at the inlet of the filter.2、Computer parameters.

When working, the outlet temperature should not be lower than 80°C.

Feed port, feed end seal ring, Rap ring, discharge end seal ring. 

Correct relationship between frequency and oil pressure of frequency converter, If there is alarm signal on the touch screen, check the alarm reason .