TQ-D series: The appearance is small at the top and big at the bottom, with the shape of upside-down taper. The most prominent features are convenient residue discharging and lower construction space. TQ-M series: The appearance is big at the top and small at the bottom, with the shape of mushroom. The top is big so that the boiling has large buffering space without running away of materials. The bottom is small so that the heat transfer of medicine liquid is rapid, the heating time is short and the extracting efficiency is higher TQ-T series: With long and thin appearance, it takes larger space, which benefits heat transfer and medium transfer, so that the leaching and heating time is shortened, and the extraction efficiency is enhanced. It is suitable for alcohol extraction and percolation systems. RQ-Z series: It takes smaller space, so it is widely used in extracting workshops. Bottom heating is provided on the residue discharging door, which makes the extracting of medicine materials more complete.