Concrete mixer truck is a special truck used to transport construction concrete; because of its shape, it is often called snail truck. These trucks are equipped with cylindrical mixing drum to carry the mixed concrete. In the process of transportation, the mixing drum will always rotate to ensure that the concrete transported will not set. After delivery of concrete, the inside of the mixing drum is usually washed with water to prevent hardened concrete from occupying space.

混凝土搅拌车的散热器在使用过程中，会因腐蚀和积垢等原因影响冷却效果。清洗散热器，去除水垢，是恢复散热器的散热能力的有效方法。车用柴油机进行维护时，须清洗发动机的冷却系统。若水垢不多，可用水强力冲洗。此时散热器和发动机水套的冲洗应分开进行。

The radiator of concrete mixer truck will affect the cooling effect due to corrosion and scaling. Cleaning the radiator and removing the scale is an effective way to restore the heat dissipation capacity of the radiator. The cooling system of the engine must be cleaned when the vehicle diesel engine is maintained. If the scale is not much, it can be washed with water. At this time, the radiator and engine water jacket should be washed separately.

预先将节温器拆下，并将汽缸盖上出水弯头的旁通孔堵塞，用专门的冲洗枪，在供入水的同时，供入压缩空气，则冲洗效果较好。冲洗水流的方向应和发动机工作时，水的循环方向相反。为减少水垢，在冷却系统中尽量是添加软水;在低温下使用，尽量添加防冻液。

If the thermostat is removed in advance, and the bypass hole of the outlet elbow on the cylinder head is blocked, a special flushing gun is used to supply water and compressed air at the same time, the flushing effect is better. The direction of flushing water flow should be opposite to that of water circulation when the engine is working. In order to reduce scale, soft water should be added to the cooling system as much as possible; antifreeze should be added as much as possible when it is used at low temperature.

如果混凝土搅拌车的散热器水垢较多，则应采取化学除垢剂清洗。即利用酸或碱类物质与水垢的化学反应，生成可溶于水的物质将水垢。清洗时，尽量采用循环法，即先用酸性溶液洗涤，再用碱性溶液冲洗中和。清洗时，除垢剂以一定的压力(一般为10l(Pa)，在汽缸体水套或散热器内循环，一般经3～5min后即可清洗完毕。清洗散热器时，清洗水套、散热器的溶液和清洗方法。

If the radiator of concrete mixer has more scale, it should be cleaned with chemical descaling agent. In other words, the chemical reaction between acid or alkali substances and scale can produce water-soluble substances to remove scale. When cleaning, try to use circulation method, that is, first wash with acid solution, and then rinse with alkaline solution to neutralize. During cleaning, the descaling agent circulates in the water jacket or radiator of the cylinder block with a certain pressure (generally 10L (PA), and the cleaning can be finished after 3-5min. When cleaning the radiator, clean the water jacket, the solution of the radiator and the cleaning method.