Safe Operation Skills of Asphalt Mixing Plant

It is very important to know the safe operating instructions of the asphalt mixing plant. The correct operation of the asphalt mixing plant can not only ensure the smooth completion of production, but also effectively protect the personal safety of the operators, and at the same time avoid damage to the asphalt mixing plant to the greatest extent.

During the operation of the asphalt mixing plant, the operator needs to complete the entire operation process skillfully and correctly. This requires operators to be trained before taking up the job. So, what aspects need to be paid attention to in order to operate the asphalt plant safely and effectively? D&G MACHINERY has compiled a guide for you to safely operate an asphalt mixing plant, hoping to help you.

Operators of asphalt mixing plants must undergo professional training, pass the examination, and obtain employment certificates before they can work on the job.

Operators must wear work caps, work clothes, work shoes, and other protective equipment when performing operations.

During the operation of the asphalt station, the operator needs to continuously monitor the operation of each component and is not allowed to leave the job without authorization. During the operation, if the operator finds that the equipment is abnormal, he should stop in time to deal with it.

When the hopper is raised, no one is allowed to work or pass under the hopper. Therefore, before starting the equipment, the operator should check the surrounding conditions of the equipment to avoid accidents.

Check whether there are materials in the hopper of the aggregate batching machine, the hoisting hopper of the hot aggregate, the mixer, and each storage hopper. If there is material in stock, it needs to be cleaned up, and then each discharge door is closed.

Check whether each part is in good condition, whether the transmission part is loose, and whether the connecting bolts of each part are fastened and reliable.

Check whether the lubricating grease at each lubrication point is sufficient, whether the oil level of each reducer is up to standard, and whether the oil quantity of the pneumatic system is normal.

Clean up the site, check whether the protective devices at each part are safe and reliable and whether the fire prevention facilities are complete and effective.

Check whether the technical parameters such as aggregate, mineral powder, asphalt, fuel, water quantity, quality, specification, and model meet the production requirements.

Check whether the temperature of the heat transfer system meets the production requirements.

Check whether the power supply voltage meets the requirements of the rated voltage of the equipment, and the deviation is not allowed to exceed 5%.

Check whether the discharge door switch of each silo is flexible and whether the material level indication is normal.

Check and start the air compressor to reach the required air pressure for operation.

Check whether the electrical components such as switches, relays, motors, and cables are normal.

Check whether the display instrument panel is normal and whether the metering device is accurate and reliable, and if it is not accurate, it needs to be adjusted accurately. At the same time, check whether the set gradation and oil-stone ratio meet the engineering requirements.

Check the bitumen supply system and bitumen temperature. After confirming that it is normal, turn on the asphalt pump to make it circulate by itself.

Ensure that the water pump of the dust removal system of the equipment is in good condition, and ensure that the water spray volume is stable and uninterrupted.

After checking and confirming that the equipment is normal, the inspector needs to issue an alarm when there are people in the dangerous area, prompting the operator to perform operations.

After each component is ready, close the circuit breaker and air switch of each branch. Then turn on the induced draft fan, blower, mixer, vibrating screen, hoist, drying drum, belt conveyor, etc. in turn. During the start-up process, inspection personnel needs to check whether there is any abnormality in the equipment and give feedback to the operator in time.

Start the above-mentioned motor for 3 minutes, and after observing that there is no abnormality, you can ignite it. Insert the oil gun, turn on the diesel pump, and light the ignition device to start the ignition. At the same time, turn on the pulverized coal machine and its speed-regulating motor, adjust the damper of the induced draft fan and blower, and observe whether it is on fire. If it doesn't light up, try again until it does. After ignition, turn off the diesel pump and pull out the oil gun.

When starting and stopping the drying drum, it must be operated according to the regulations. When the ignition fails, the operator should close the throttle valve of the burner in time, and then ignite after the ventilation is sufficient. When the ignition needs to be adjusted, the high-voltage power supply must be cut off first.

Start feeding at this time. When starting to feed, the amount of feed should be controlled, otherwise, the temperature will rise slowly. When the temperature rises above 100℃, the feeding amount can be gradually increased until it is normal. Observe the temperature change at any time, and adjust the amount of aggregate and powder to ensure the temperature of the aggregate.

First, adjust the control system to manual control mode, and produce 8~10 batches of asphalt mixture under the manual measurement state. After ensuring the normal operation of the equipment, the control system is adjusted to the automatic control mode, and the asphalt mixture produced is sampled and tested in time.

Regularly check the status of each dashboard. If any abnormal situation is found, it should be adjusted in time.

During the production process, the operator should always observe the outdoor situation and keep in close contact with the personnel in each position to ensure the normal operation of the equipment and the safety of personnel.

Special attention is that the emergency stop button can only be used in emergency situations, and it is strictly forbidden to be used as a normal stop button. Use once, and when starting up again, be sure to pay attention to the starting sequence of each component.

When the motor is overloaded and the protection device is triggered, it is generally necessary to find out the cause and continue to run the asphalt station after troubleshooting.

It is strictly forbidden to pile up tools and objects on the equipment in operation.

According to the situation of the hot aggregate storage silo before shutting down, the feeding can be stopped when the last five or six batches of asphalt mixture are produced. After another 2 to 3 minutes, turn off the fire, and stop the pulverized coal machine and the adjustable-speed motor.

Pour the fine stone and sand into the mixing tank, stir for a while, and clean the asphalt mixture remaining in the mixing tank. Finally, put away the remaining material in the hot aggregate storage silo.

Turn off each motor in the reverse order of starting. It should be noted that when the machine stops, the drying drum and feeding belt will continue to run until the temperature of the drying drum is lower than 90℃.

Stop spraying asphalt immediately after the burner of the drum mixing asphalt equipment is turned off. When the drying drum is on fire, the burner, blower, and exhaust fan should be turned off immediately, the asphalt supply should be stopped, and then the fine aggregate with high water content should be put into the drying drum, and the fire should be extinguished with dry powder or foam fire extinguisher at the external discharge port.

After shutting down, the material on the belt conveyor and the residual sediment inside and outside the dust removal device should be removed, and the asphalt pipeline should be cleaned.

After shutting down, clean up the site, and carry out daily inspection and maintenance on the asphalt station according to the instructions.

As a professional asphalt mixing plants manufacturer, D&G MACHINERY has professional engineers to guide the installation, operation, and maintenance of the equipment. We provide full life cycle services for every asphalt mixing plant. From selling to scrapping of each D&G MACHINERY mixing plant, there is a professional responsible engineer who provides butler-style considerate service throughout the process.

Anhui Road and Bridge Engineering Group Co., Ltd. is one of our high-quality partners. According to their actual needs of them, we sent our deputy chief engineer of D&G MACHINERY to conduct online training for each staff member of Anhui Road and Bridge. They adhere to being people-oriented, and everything starts with safety and health. Therefore, the lecture puts safety production at the top of the list and especially focuses on explaining that no matter whether before the equipment is turned on, during operation, or during maintenance or renovation, it must be under the premise of ensuring the safety of personnel and equipment, follow the correct steps in the operating specifications, especially for the boiler system. If there is any problem, it must be reported in time and handled by professionals.

Our training focuses on how to judge the fault point of the equipment and better complete the inspection and maintenance work. Explain one by one the cold aggregate, drying, dust removal, electrical components of the mixing plant, and other systems of the mixing plant. In terms of maintenance, the cycle, drawing number, lubrication points, operation, instructions, etc. are summarized into parameter charts, so that each staff member can understand the key points at a glance, adding knowledge of the asphalt mixing plant knowledge to Anhui Road and Bridge Group.

In order to enable each staff to master the key parts of the equipment, we decompose and describe the key and vulnerable parts of each monomer system during training. From the maintenance of the belt conveyor and scraper in the cold aggregate system to the drying cylinder and burner in the drying system, the quality requirements for fuel selection when the burner uses different fuels are highlighted. Through the close integration of service and business, D&G MACHINERY always adheres to the mission of "building a world-class brand and being a super-excellent comprehensive service provider", puts products and services in the first place, strives to achieve excellence, and constantly enhances its sense of urgency and mission, a sense of responsibility, so that the core values of "integrity, innovation, responsibility, and win-win" are truly recognized by the majority of road builders.