The design and selection of mixing equipment are closely aligned with the objectives of the mixing operation. Different mixing processes require different mixing equipment to be operational. During the design selection, it is first necessary to determine the type of mixer, motor power, and mixing speed based on the process objectives and requirements for the mixing operation. Subsequently, components such as reducers, frames, mixing shafts, and shaft seals are chosen. The specific steps and methods are as follows:

1. Select the appropriate stirrer type based on process conditions, mixing objectives, and requirements. When choosing a stirrer, it is crucial to fully understand the stirrer's power characteristics and the causal relationship between the flow state generated during the mixing process and various mixing objectives.

2. Based on the determined type of mixer and the flow patterns it generates during the mixing process, the process requirements for controlling mixing time, sedimentation speed, and dispersion are established through experimental methods and computer simulations. This leads to the determination of motor power, mixing speed, and impeller diameter.

3. Select the appropriate reducer model from the reducer selection chart based on motor power, stirrer speed, and process conditions. If selecting the reducer based on the actual working torque, the actual working torque should be less than the allowable torque of the reducer.

4. Select a frame and coupling of the same model and specification as the output shaft head "d" and the stirrer shaft support method.

5. Select the shaft seal type based on the shaft head diameter (do), installation space, working pressure, and working temperature.

6. Based on the installation form and structural requirements, the design selects a mixing shaft structural type and checks its strength and rigidity. If designed as a rigid shaft, under strength conditions, n/nk ≤ 0.7. If designed as a flexible shaft, under strength conditions, n/nk ≥ 1.3.

7. Select the installation base, flanged base, or flanged flange according to the nominal diameter DN of the rack, the type of bearing for the agitator shaft, and the pressure class.

8. Determine whether to configure auxiliary supports based on bearing and vibration conditions.