The CJ variable-section folding blade is an axial-flow blade. Two small blades are installed at the front end of the main blade, opposite to the inclination direction of the main blade. This can forcibly change the flow direction at the front end of the main blade, enhancing the intensity of tip turbulence, resulting in stronger mixed turbulence at the blade tip. This type of blade generally operates in the transition flow region and is suitable for unit operations such as mixing, dispersion, suspension, gas absorption, and heat transfer of medium viscosity.