The reason for the blockage of the transfer pump of Zhongke self loading mixer truck is that the normally pumped concrete forms a columnar fluid in the center of the pipe, which is suspended when flowing. There is a layer of cement slurry on the surface, which contacts with the pipe wall as a lubricant, and there is basically no relative movement between the aggregates. When the movement of some coarse aggregate is blocked, the movement speed of the aggregate behind is affected by it, resulting in the formation of coarse aggregate aggregation, and the nearby mortar is squeezed away, the remaining gap is filled with small aggregate, the cement slurry lubrication layer is damaged, the movement resistance increases, and the speed slows down until the movement stops and the pipe is blocked.

混凝土搅拌车输送泵堵塞分析及排除

Analysis and elimination of blockage of concrete mixer pump

1、 进料口处的堵塞

1. Blockage at the feed port

(1)现象泵送运动及液压系统均正常，无异音和振动，料斗内有较大骨料或结块，在进料口处卡住或拱起而堵塞。

(1) Phenomenon pumping movement and hydraulic system are normal, no abnormal sound and vibration, there are large aggregates or lumps in the hopper, stuck or arched at the feed port and blocked.

(2) 排除方法泵反向运转以破坏拱起，使混凝土回到料斗，重新搅拌，再正向泵送。如果反向不成，则需人工清理，予以排除。

(2) The elimination method is that the pump runs in the reverse direction to destroy the arching, make the concrete return to the hopper, mix again, and then pump forward. If the reverse direction fails, manual cleaning is needed to eliminate it.

2、分配阀出料口处的堵塞

2. Blockage at outlet of distributing valve

(1)现象泵送系统动作突然中断，并有异响，产生较强烈的振动，但管道内无相应振动。

(1) Phenomenon pumping system action suddenly interrupted, and there is abnormal sound, resulting in strong vibration, but there is no corresponding vibration in the pipeline.

(2) 排除方法往料斗内倒入15～30L水泥浆，使泵反复正反向起动，迫使打开通路，若此法无效，则只能人工排除，拆下相连管，去掉阀内杂物即可。

(2) Method: pour 15-30l cement slurry into the hopper to make the pump start up in forward and reverse directions repeatedly, and force to open the channel. If this method is invalid, it can only be removed manually. Remove the connecting pipe and remove the impurities in the valve.
           

3、Ｓ管阀处堵塞

3. S pipe valve blocked

(1) 现象 S管阀处堵塞是逐渐形成的，主要原因是泵送完混凝土后，没及时用高压水冲洗，致使管内残留混凝土，日久逐渐加厚，堆积固结，造成堵塞。

(1) Phenomenon s pipe valve blockage is gradually formed, the main reason is that after pumping concrete, did not wash with high pressure water in time, resulting in residual concrete in the pipe, gradually thickened over time, accumulated consolidation, resulting in blockage.

(2) 排除方法泵送混凝土结束后，要用高压水将泵体和S管冲洗干净。冲洗无效时，可采用钎镐把残渣去掉，直为止。

(2) After the end of pumping concrete, the pump body and S pipe should be washed with high-pressure water. When the washing is invalid, the residue can be removed with a chisel until it is removed.

4、混凝土输送管道堵塞

4. The concrete pipeline is blocked

(1) 现象输送压力逐渐增加，而料斗料位不下降，管道出口不出料，泵发生振动，管路也伴有强烈的振动和位移时，可判定是管道堵塞。

(1) When the conveying pressure increases gradually, the hopper material level does not drop, the pipe outlet does not discharge, the pump vibrates, and the pipeline also has strong vibration and displacement, it can be determined that the pipeline is blocked.

(2) 堵塞部位的判断堵塞一般发生在弯管和锥管处有振动的部位。一般情况是从泵的出口开始。征兆是：未堵塞的管段会发生剧烈振动，堵塞部位以后的管路则无振动感。可以用听觉判断，未堵塞段混凝土被吸动时，会有响声；堵塞部分以后段则没有声响。还可以用木锤敲打管道检查，凭敲打时手感或声音判断，堵塞部位会有发“闷”的声音和密实的感觉。在长距离水平输送时,如有管接头漏浆的情况,泄漏部位后面的直管内也容易发生堵塞。

(2) The judgment of clogging position the clogging usually occurs at the vibration position of elbow and cone pipe. Generally speaking, it starts from the outlet of the pump. The symptom is: the pipe section that is not blocked will vibrate violently, and the pipe after the blocked part will not vibrate. It can be judged by hearing that when the concrete in the non blocked section is sucked, there will be a sound; after the blocked section, there will be no sound. You can also use a wooden hammer to knock the pipe for inspection. Judging by the feeling or sound of knocking, there will be a "stuffy" sound and dense feeling in the blocked part. In the long-distance horizontal transportation, if there is slurry leakage at the pipe joint, the straight pipe behind the leakage part is easy to be blocked.

(3)排除方法发生堵塞时，可反复正、反转泵，堵管的排除在一边进行反转泵送，一边沿管路检查时，可以用木锤敲打被认为是堵塞的部位，有时能使堵塞的骨料受振后松散而使泵送畅通；若敲打无效，则不可用铁锤或其它可能伤害管道的物件重击。如果堵管部位判断得准确，而且堵塞处离管道卸料的末端不远时，只要把堵塞管拆下，其中已堵塞的混凝土，再装回去，即可继续泵送。如果堵管部位离管道末端较远，堵塞段被清理后回装到管路时，这段空管由于气塞作用，可能造成再次堵管。在这种情况下，应将堵塞段以后的管道混凝土用压缩空气吹出再接管泵送。如果堵管部位不能迅速判断或者难以拆卸时，应采用气洗方法把混凝土吹除。在堵管的情况下，往往需要分段吹洗。若分成较短的管段也吹洗不动，应尽快组织人力，把全部管道逐节拆卸，其中的混凝土，并用水冲洗干净。

(3) When the blockage occurs, the pump can be reversed repeatedly. When the blockage is eliminated, the pump can be reversed while checking along the pipeline. The wooden hammer can be used to knock the parts that are considered to be blocked. Sometimes, the blocked aggregate can be loosened after being vibrated to make the pumping smooth. If the knocking is ineffective, the hammer or other objects that may damage the pipeline can not be used to hammer. If the position of pipe blockage is judged accurately, and the blockage is not far from the end of pipe discharge, as long as the blocked pipe is removed, the blocked concrete is removed, and then the pump can continue. If the plugging part is far away from the end of the pipe, when the plugging section is cleaned and installed back into the pipe, the empty pipe may be blocked again due to the air plug. In this case, the pipe concrete after the blocking section should be blown out with compressed air and then pumped by connecting pipe. If the plugging part cannot be judged quickly or is difficult to be removed, the concrete shall be blown away by air washing. In the case of pipe plugging, it is often necessary to purge by sections. If the pipe is divided into short sections and cannot be blown, manpower shall be organized as soon as possible to dismantle all the pipes one by one, remove the concrete and wash them with water.

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