When the concrete mixer stops working or stops working for a period of time, the problem of concrete retention will occur. If the concrete stays in the mixing drum for a long time (generally 30 ~ 80min), the concrete will coagulate, or even coagulate with the attached objects, resulting in the scrapping of the mixing drum and other equipment. At the same time, due to the nature of work or environmental constraints, concrete will inevitably produce a certain degree of pollution to the vehicle system. After a transportation process is completed, if it is not cleaned, it will bring great damage to the paint on the concrete truck and machine, especially when there are corrosive additives in the concrete, it will be more destructive. To prevent these problems and prepare for the next stage of transportation, once one stage is completed, the hybrid is equipped with a water supply system. The commonly used water supply system of the mixer is only used for the washing of the feed hopper and the discharge chute, not for the supplement of the concrete.

　　用于清洗的供水系统是利用直流电机泵将储水箱中的水抽出，并通过水管喷嘴将混合器冲洗干净。它的储水箱不大，一般在200 - 250L之间。全自动自上料搅拌车的供水系统需要一个大水箱，容量不小于600L。

　　The water supply system for cleaning is to use DC motor pump to pump out the water in the water storage tank and wash the mixer through the water pipe nozzle. Its water storage tank is not large, generally between 200 - 250L. The water supply system of concrete mixer needs a large water tank with a capacity of no less than 600L.

　　对于一些中小搅拌运输车辆,为了简化供水系统的结构,节约能源,减少的重量夹克,经常保存水泵,气动喷雾系统的使用,它是汽车的底盘存储后的气缸,然后安装减压二级存储气缸,空气压力通过管道进入贮水,水的压力下喷射的作用。气动给水系统由压力箱、球阀、顺序阀、减压阀、阀组成。压力罐与进水管相连，通过闸阀与水源相连。加水前，打开三通球阀，将压力罐内的压缩空气排出。然后进入满水溢流口，见水溢出，即关闭闸阀。使用压力罐内的水时，先打开球阀，压缩空气通过顺序阀、减压阀、阀，并与罐内连接，水可沿管道泵送并将阀门送冲洗管和搅拌缸。当车辆行驶时，关闭球阀，保证制动气源。

　　For some medium and small agitated transport vehicles, in order to simplify the structure of the water supply system, save energy and reduce weight jackets, water pumps are often saved and pneumatic spray systems are used. It is the storage cylinder behind the chassis of the vehicle, then install the decompression two level storage cylinder, and the air pressure force enters the storage water through the pipeline, and the water pressure is injected under the action. Pneumatic water supply system consists of pressure tank, ball valve, sequence valve, pressure reducing valve and safety valve. The pressure tank is connected with the water inlet pipe and the water source through the gate valve. Before adding water, open the three-way ball valve to discharge the compressed air in the pressure tank. Then enter the full water to the overflow port, and close the gate valve if water overflows. When using the water in the pressure tank, first open the ball valve. The compressed air is connected with the tank through the sequence valve, pressure reducing valve and safety valve. The water can be pumped along the pipeline and sent to the flushing pipe and mixing tank. When the vehicle is running, close the ball valve to ensure the brake air supply.