Pipe truck, also known as "waterwheel", is a tool for irrigating fields with water as power. According to historical records, the tube car was invented in the Sui Dynasty and flourished in the Tang Dynasty, with a history of 1000 years. This kind of ancient tube car, which is automatic by hydraulic power, has formed an ancient pastoral spring color map in the lush Shan Jian and streams in my hometown, which is an outstanding invention of ancient people in China.

Pipe truck, also known as "crown block", "bamboo truck", "waterwheel" and "waterwheel", is a hydraulic irrigation tool. According to the material, there are two kinds of bamboo tube cars and wooden tube cars. The waterwheel of the truck stands upright in the river, and many small bamboo pipes are installed obliquely around the wheels, totaling 42. The main wheel is driven by water flow; The small tubes around the wheel are filled with water in turn, poured to the top, connected with the wooden trough and led into the canal field.

The principle of pipe car operation

The cylinder acts as an impeller: it bears the impulse of water (provided by the kinetic energy and speed of water), and the energy gained makes the lower vehicle rotate. Overcome the friction resistance of the truck and the reaction moment of the lifted water to the truck. When rotated at a certain angle, the bamboo tube that was originally immersed in water (filled with water) will leave the water surface and be lifted.

The radius of the outer ring where the barrel bottom is located is greater than the radius of the inner ring where the barrel mouth is located. Because it is concentric circles, the bamboo tube holds water in a low place (the mouth of the barrel is higher than the bottom of the barrel) and drains water in a high place (the mouth of the barrel is lower than the bottom of the barrel). By adjusting the position and length of the water tank, the water tank can hold more water.