What is the working principle of a concrete pump truck?

[StPeter]

Here is the working principle of a concrete pump truck: The engine drives the water pump bearing and impeller to rotate through the pulley. The coolant in the water pump is driven by the impeller to rotate together. Under the action of centrifugal force, it is thrown to the edge of the water pump housing, generating a certain pressure, and then flows out through the outlet channel or pipe. Extended content: Here is an introduction to the automobile water pump: 1. Structure introduction: Centrifugal water pumps are widely used in automobile engines. Its basic structure consists of the water pump housing, connecting plate or pulley, water pump shaft and bearing or shaft-connected bearing, water pump impeller, and water seal device, which are the main components of an automobile. 2. Water pump drive: The automobile micro water pump is generally driven by the engine's crankshaft through a V-belt. The transmission belt is wrapped between the crankshaft pulley and the water pump pulley. When the crankshaft rotates, the water pump shaft also operates, driving the impeller to rotate, thereby converting mechanical energy into hydraulic energy. The impeller is the core of the water pump's operation. The movement of the impeller itself is simple, just rotating with the shaft. However, due to the role of the blades, the movement of the liquid in the impeller is quite complex; on the one hand, it moves along with the impeller's rotation as a connected motion, and on the other hand, it is continuously thrown out from the rotating impeller under the drive of the blades, i.e., the motion relative to the impeller. Therefore, the outer diameter of the impeller, the height and angle of the impeller blades, and the gap with the water pump housing directly affect the performance of the water pump.

[Fernando]

I once observed the operation of a concrete pump truck at a construction site. It mainly consists of a mixing drum, hydraulic pump system, and boom pipeline. The working principle is: first, concrete is loaded from the mixing station into the mixing drum, which continuously rotates to prevent the concrete from solidifying. Then, after being transported to the construction site, the concrete is sucked into the pump chamber by the hydraulically driven piston pump system and then pushed out, directly delivered to the pouring point through the boom's pipeline. The entire process is like a large mechanical arm, capable of extending to over 20 stories high, precise and efficient. The key is to ensure hydraulic oil temperature control and pipeline cleanliness, otherwise, pipe blockage is prone to occur. I think this design is very ingenious, greatly reducing manual labor and wasted time.