The design selection of mixing equipment is closely integrated with the purpose of mixing operations. Different mixing processes require the operation of various mixing equipment to achieve them. When selecting the design, the first step is to determine the type of mixer, motor power, and mixing speed based on the process requirements for the mixing operation. Then, the selection of components such as the reducer, frame, mixing shaft, and shaft seal follows. The specific steps and methods are as follows:

1. Select the type of mixer based on process conditions, mixing objectives, and requirements. When choosing a mixer type, it is essential to fully understand the power characteristics of the mixer and the relationship between the flow patterns generated during the mixing process and the causes and effects of various mixing objectives.

2. Based on the selected type of agitator and the flow patterns it generates during the mixing process, the process requirements for controlling mixing time, settling speed, and dispersion are determined through experimental methods and computer simulations. The motor power, agitator speed, and agitator diameter are then established.

Select the appropriate reducer model from the reducer selection table based on the motor power, stirring speed, and process conditions. If choosing a 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 with the same model and specification as the output shaft diameter 'd' of the reducer, based on the support method of the stirrer shaft system.

5. Select the shaft seal type based on the shaft head "do" size, installation space, working pressure, and working temperature.

6. Based on the installation form and structural requirements, the design selects the mixing shaft structural type and checks its strength and stiffness. 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 cover, flanged base, or flanged flange according to the nominal pipe size DN of the rack, the type of bearing for the stirrer shaft, and the pressure class.

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