The present invention provides an extraction method for the leaves of Ilex kudingcha C. The control circuit includes an inverter, or a first inverter and a second inverter forming a latch. By way of example, the tools may include indicator tools for measuring the relative position of the component parts, as well as alignment tools for aligning the component parts in accordance with the measurements. The first and second sides are disposed adjacent to the first and second cell terminals, respectively. A mechanism is disposed on the butterfly valve to increase the speed of flow in the carburetor in the vicinity of the fuel opening.