A few days ago, a video of cement tanker exploded in WeChat Moments. In the video of
, a cement tanker tank body was blown to pieces, leaving only a part of the "iron sheet" connected to the base of the vehicle body. The power of the explosion site can be imagined.
It has always been common for cement tanker explosions to occur. In an accident not long ago, a cement tanker was parked on the edge of the storage tank of the commercial concrete station, and then an explosion occurred, and the operator on the truck was blown away directly. The video is as follows:
From the video, it is suspected that an operator beat the ash on the truck into the tank of the mixing station after climbing onto the tank, and then an explosion occurred.
The explosion of the cement tanker is serious, but if you pay attention to some detailed factors that cause the accident, such accidents may be completely avoided.
At the beginning of this year, some netizens revealed that the explosion of powder tanker trucks at a mixing station was caused by the driver sleeping in the cab when entering the tank, and no one was watching the scene, which caused the pipeline to be blocked and the air pressure was too high, causing the accident to cause an explosion. The accident caused 1 death, 3 serious injuries and 7 vehicles to be scrapped! The mixing station where the accident occurred is also facing indefinite suspension of production and rectification.
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How to operate the cement tanker correctly? I hope the following content and methods can help you.
1. Safety operation specifications for cement tanker
1. Loading
1. Be sure to open the pressure relief valve before opening the manhole to check whether the pressure in the tank is the same as the atmospheric pressure, that is, the pressure gauge value is zero.
2. After opening the manhole, check whether there are agglomerated powder particles in the jar. Especially for the jar that has been filled with powder particles and has not been used for a long time, you should carefully check it to remove the agglomerated powder particles.
3.Pack the material into the can.
4. After the loading is completed, the powder particles are accumulated in the sealing ring of feed port . You should clean it before closing the feed port to ensure sealing performance.
2. Unloading
1. Connect the discharge pipe to the required connection to ensure reliable sealing.
2. Close the discharge valve, pressure relief valve, external air valve and secondary air valve.
3. When the brake pressure reaches 392kPa, step down the clutch pedal, pull out the pneumatic switch valve handle of the power-taking box in the cab, so that the power-taking box is in gear, and then slowly release the pedal to make the air compressor run smoothly. In order to increase the hand throttle so that its speed reaches the rated speed and inflate the air chamber in the tank.
4. When the pressure in the tank, i.e. the pressure gauge reading is 196kPa, open the discharge butterfly valve. During the transportation process, if the pressure rises to exceed 196kPa, the pipeline is blocked.
5. Control the hand throttle to maintain the dust removal pressure of 145-165kPa. The general discharge speed is 1.2T/min. When the dust removal is completed, the pressure in the tank drops to 9.8-19.6kpa. At this time, the secondary air ball valve should be opened to clear all the dust removal pipes.
6. Relax the accelerator and press the clutch pedal, separate the power take-up to stop air compressor from rotating.
7. Open the pressure relief valve to discharge the remaining compressed gas in the tank body, so that the pressure in the tank is equal to atmospheric pressure and can avoid "lifting the cover" accident when opening the feed port.
8. When the input height exceeds 15 meters from the horizontal distance of 5 meters, after opening the butterfly valve to unload the feed, the secondary air ball valve should be opened to dilute the powder particle concentration and increase the ash discharge height.
3. Safety precautions
1. Before uncovering the feed cover each time, open the pressure relief valve to discharge the residual air in the tank to avoid injury accidents.
2. Pay attention to whether the pressure gauge is working normally and strictly prevent the pressure gauge from failing and overpressure to cause the tank explosion.
3. Check the safety valve frequently to ensure that the discharge starts at 196kPa, and the pressure in the tank must not be caused to exceed 196kPa.
4. Check frequently whether the tachometer is working properly to avoid overturning and damaging the air compressor and power-taking box.
5. Always listen to the rotation sound of the force box and the air compressor. If there is any abnormal sound, stop the machine and troubleshoot the fault immediately.
2. Safety operating procedures for concrete mixers
1. Fixed mixers should be installed on a firm pedestal. When fixed for a long time, anchor bolts should be buried; when used for a short period of time, wooden sleepers should be laid on the machine base and placed flat and steadily. Tires are not allowed to replace support.
2. The operating table of the fixed mixer should enable the operator to see the working conditions of each department. The control table of the electric mixer should be padded with rubber plates or dry wood boards.
A few days ago, a video of cement tanker exploded in WeChat Moments. In the video of
, a cement tanker tank body was blown to pieces, leaving only a part of the "iron sheet" connected to the base of the vehicle body. The power of the explosion site can be imagined.
It has always been common for cement tanker explosions to occur. In an accident not long ago, a cement tanker was parked on the edge of the storage tank of the commercial concrete station, and then an explosion occurred, and the operator on the truck was blown away directly. The video is as follows:
From the video, it is suspected that an operator beat the ash on the truck into the tank of the mixing station after climbing onto the tank, and then an explosion occurred.
The explosion of the cement tanker is serious, but if you pay attention to some detailed factors that cause the accident, such accidents may be completely avoided.
At the beginning of this year, some netizens revealed that the explosion of powder tanker trucks at a mixing station was caused by the driver sleeping in the cab when entering the tank, and no one was watching the scene, which caused the pipeline to be blocked and the air pressure was too high, causing the accident to cause an explosion. The accident caused 1 death, 3 serious injuries and 7 vehicles to be scrapped! The mixing station where the accident occurred is also facing indefinite suspension of production and rectification.
↓↓↓
How to operate the cement tanker correctly? I hope the following content and methods can help you.
1. Safety operation specifications for cement tanker
1. Loading
1. Be sure to open the pressure relief valve before opening the manhole to check whether the pressure in the tank is the same as the atmospheric pressure, that is, the pressure gauge value is zero.
2. After opening the manhole, check whether there are agglomerated powder particles in the jar. Especially for the jar that has been filled with powder particles and has not been used for a long time, you should carefully check it to remove the agglomerated powder particles.
3.Pack the material into the can.
4. After the loading is completed, the powder particles are accumulated in the sealing ring of feed port . You should clean it before closing the feed port to ensure sealing performance.
2. Unloading
1. Connect the discharge pipe to the required connection to ensure reliable sealing.
2. Close the discharge valve, pressure relief valve, external air valve and secondary air valve.
3. When the brake pressure reaches 392kPa, step down the clutch pedal, pull out the pneumatic switch valve handle of the power-taking box in the cab, so that the power-taking box is in gear, and then slowly release the pedal to make the air compressor run smoothly. In order to increase the hand throttle so that its speed reaches the rated speed and inflate the air chamber in the tank.
4. When the pressure in the tank, i.e. the pressure gauge reading is 196kPa, open the discharge butterfly valve. During the transportation process, if the pressure rises to exceed 196kPa, the pipeline is blocked.
5. Control the hand throttle to maintain the dust removal pressure of 145-165kPa. The general discharge speed is 1.2T/min. When the dust removal is completed, the pressure in the tank drops to 9.8-19.6kpa. At this time, the secondary air ball valve should be opened to clear all the dust removal pipes.
6. Relax the accelerator and press the clutch pedal, separate the power take-up to stop air compressor from rotating.
7. Open the pressure relief valve to discharge the remaining compressed gas in the tank body, so that the pressure in the tank is equal to atmospheric pressure and can avoid "lifting the cover" accident when opening the feed port.
8. When the input height exceeds 15 meters from the horizontal distance of 5 meters, after opening the butterfly valve to unload the feed, the secondary air ball valve should be opened to dilute the powder particle concentration and increase the ash discharge height.
3. Safety precautions
1. Before uncovering the feed cover each time, open the pressure relief valve to discharge the residual air in the tank to avoid injury accidents.
2. Pay attention to whether the pressure gauge is working normally and strictly prevent the pressure gauge from failing and overpressure to cause the tank explosion.
3. Check the safety valve frequently to ensure that the discharge starts at 196kPa, and the pressure in the tank must not be caused to exceed 196kPa.
4. Check frequently whether the tachometer is working properly to avoid overturning and damaging the air compressor and power-taking box.
5. Always listen to the rotation sound of the force box and the air compressor. If there is any abnormal sound, stop the machine and troubleshoot the fault immediately.
2. Safety operating procedures for concrete mixers
1. Fixed mixers should be installed on a firm pedestal. When fixed for a long time, anchor bolts should be buried; when used for a short period of time, wooden sleepers should be laid on the machine base and placed flat and steadily. Tires are not allowed to replace support.
2. The operating table of the fixed mixer should enable the operator to see the working conditions of each department. The control table of the electric mixer should be padded with rubber plates or dry wood boards.
3. The parking position of the mobile mixer should be selected with a flat and solid site, and there should be good drainage ditches around it. After being in place, the legs should be lowered to lift the frame to a horizontal position so that the tires can be off the ground. When the service life is long, the tire should be removed and stored properly, the ends of the wheel shaft should be wrapped with tarpaulin, and the frame should be padded with sleepers.
4. For mixers that need to be equipped with hopper pits, the surrounding holes of the pit should be raised and compacted to prevent ground water from flowing into the pit. The bottom end support surface of the loading track frame should be compacted or bricked, and the back of the track frame should be supported by wood to prevent the track from deforming during operation.
5. When the hopper is placed at the lowest position, a layer of buffer cushion wood should be added between the hopper and the ground.
6. Key inspection items before operation should comply with the following requirements:
(I) The power supply voltage rise and fall does not exceed 5% of the rated value, the leakage protector parameters should be matched, the installation should be correct, and the action should be sensitive and reliable; (II) The wiring of the motor and electrical components is firm, and the protective zeroing or grounding resistance is in compliance with the regulations; (III) All transmission mechanisms, working devices, brakes, etc. are tightened and reliable, open gears, pulleys, etc. have protective covers, the safety hooks of the upper hopper and the safety pins on the track are intact; (IV) The oil quality and oil quantity of the gear box comply with the regulations.
7. Before operation, the mixer should be started to run at no load. It should be confirmed that the rotation direction of the stirring drum or blade is consistent with the direction indicated by the arrow on the cylinder. For mixers that reverse discharge, the mixing drum should be run forward and reverse for several minutes, and there should be no impact shaking and abnormal noise.
8. Before operation, a hopper lift test should be carried out, and the clutch and brakes should be observed and confirmed to be flexible and reliable.
9. The water pump and pipeline components of the water supply system should be complete and complete, the water supply pipeline should not be leaked, and anti-rust fittings should be used; when the water temperature reaches 50℃, the water supply system should still ensure normal operation; the water supply instrument metering data should be accurate and within the period of the valid table. The consistency between the indicated water volume of the water supply system and the actual water volume should be checked and corrected; when the error exceeds 2%, the water leakage point of the pipeline should be checked, or the throttle valve should be corrected.
10. The aggregate specifications should be checked and should be consistent with the performance of the mixer. Those that exceed the license scope shall not be used.
11. After the mixer is started, the mixer should be loaded after the mixer reaches the normal speed. Water should be added in time when loading the material. The mixing material added each time must not exceed the rated capacity of the mixer and the material should be stuck in the tank. The order of feeding should be gravel-cement-sand or sand-cement-gravel.
12. When feeding, it is strictly forbidden to put your head or hand between the hopper and the rack. During operation, it is strictly forbidden to use hands or tools to penetrate into the mixing drum to remove or discharge materials.
13. During the mixer operation, when the hopper is raised, no one is allowed to stay or pass under the hopper; when it is necessary to repair or clean the pit under the hopper, the hopper should be lifted and locked with an iron chain or insertion pin.
14. Adding materials into the mixing drum should be carried out during operation. Adding new materials should be unloaded all the original concrete in the mixing drum before it can be carried out.
15. During operation, the machine should be observed. When there is abnormality or the bearing temperature rise is too high, the machine should be shut down for inspection; when maintenance is required, the concrete in the mixing drum should be cleaned and then maintenance is carried out.
16. The sewage generated in the mixer operation should be red and set up a sedimentation tank, and discharged to meet the standards after sedimentation.
17. The maximum particle size of aggregate added to the mandatory mixer shall not exceed the allowable value, and materials should be prevented. During each stirring, the material added to the stirring drum should not exceed the specified feed capacity.
18. The gap between the stirring blades of a forced mixer and the bottom and side walls of the mixing drum should be checked frequently and confirmed to comply with the regulations. When the gap exceeds the standard, it should be adjusted in time. When the agitating blades wear exceed the standard, they should be repaired or replaced in time.
19. It is strictly forbidden to operate without a license, and it is strictly forbidden to leave the job without authorization during operation.
20. After operation, the mixer should be cleaned thoroughly, lubricated and maintained, and the power supply should be cut off and locked the box door; when the operator needs to enter the barrel, the hopper should be fixed, the power supply should be cut off or the fuse should be removed, the switch box should be locked, and the "No closing" sign should be hung, and a dedicated person should be supervised outside.
21. After operation, the hopper should be lowered to the bottom of the pit. When it needs to be raised, use the chain or latch to fasten it.
22. After winter operation, all the accumulated water in the water pump, water discharge switch, and water measuring device should be drained.
23. When the mixer moves in the yard or transports it from a long distance, the feed hopper should be lifted to the upper dead center and locked with an insurance chain or a pin.
21. After operation, the hopper should be lowered to the bottom of the pit. When it needs to be raised, use the chain or latch to fasten it.
22. After winter operation, all the accumulated water in the water pump, water discharge switch, and water measuring device should be drained.
23. When the mixer moves in the yard or transports it from a long distance, the feed hopper should be lifted to the upper dead center and locked with an insurance chain or a pin.
