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.
用于清洗的供水系統是利用直流電機泵將儲水箱中的水抽出，并通過水管噴嘴將混合器沖洗干凈。它的儲水箱不大，一般在200 - 250L之間。全自動自上料攪拌車的供水系統需要一個大水箱，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.
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.