With the soaring highway construction, asphalt concrete pump equipment is widely used by construction units. However, in the concrete pouring operation, due to improper use, causing equipment plugging failure occurs, which not only affects the progress of the project, but also directly affect the quality of the project. Asphalt pump is not blocked tube what is the reason? Please listen to the experts for more details: Under normal circumstances, the formation of concrete in the asphalt pump columnar fluid flow was suspended state. The surface of the fluid is covered with a layer of grout, which acts as a lubricant in contact with the wall of the pipe, with virtually no relative movement between the aggregates. When some aggregates get blocked in the aggregates, the velocity of the aggregates behind them gradually slows down. As a result, the coarse aggregates in the pipe form a buildup, and the mortar supporting the coarse aggregates is squeezed away. The remaining gap consists of Small aggregate fill. In this way, the aggregate density increases, so that the section of the pipeline along the pipeline radial expansion of the composition, the cement slurry lubrication layer is destroyed, increased resistance to movement, slow down, until the movement stops and clogging. When the transmission of asphalt pump body and hydraulic system are normal, no abnormal sound and vibration, the hopper has a larger aggregate or agglomeration, then the entrance stuck or arched and blocked. We should reverse the operation of the asphalt pump to destroy a block, stone concrete back to the hopper to re-stir, and then to the pump body. If you do not work, you need to manually clean up, to be excluded. When the asphalt pump conveying system suddenly interrupted, and there is abnormal noise, the device has strong vibration, but no corresponding vibration within the pipeline. Need to pour into the hopper 15 ~ 30L slurry, repeatedly positive and reverse pump, forcing the access open. If this law is invalid, it can only be manually excluded, remove the connected pipe, remove the valve debris. When the asphalt pump delivery finished concrete, did not flush with high-pressure water in time, resulting in residual concrete in the pipe, over time gradually thickening, accumulation, resulting in blockage. At this time must be high-pressure water to pump and tube clean, when the flush is invalid, you can use brazing knock to remove the residue until completely clean so far. When the delivery pressure is gradually increased, while the hopper level does not decline, the pipe outlet does not discharge material, the pump vibrates, the pipe is also accompanied by strong vibration and displacement, it can be judged as pipeline blockage. Blockage of the judgment: Blockage generally occurs in elbows, cones, and the vibration of the lot. At this point, you can use a small hammer along the pipe beat, the sound dull at the block; sound crisp at normal. Listen with ears, rustle sound as normal, there is a harsh sound for the blockage. When blockage occurs, should immediately take the positive and negative pump method, and gradually pump the concrete pump back to the hopper to re-mix before delivery. Also available wood hammer percussion method, combined with positive and negative pump to make it clear; when the above method is invalid, indicating serious blockage. Identify the blockage, the pipe removed, with high-pressure wind or heavy hammer percussion or high-pressure water rinse, to be thoroughly cleaned, and then connect the pipeline to continue pumping concrete work.
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