Which of the following is a type of centrifugal blast setup?

A plain table is indeed a type of centrifugal blast setup primarily used in surface preparation and cleaning processes. In centrifugal blast cleaning, abrasive materials are propelled onto the surface using a high-speed centrifugal force generated by a rotating wheel. The plain table setup typically features a flat surface where items can be placed and cleaned while allowing the abrasive to be evenly distributed and energetically projected toward the workpiece.

The function of the plain table is essential in various industrial applications, as it provides the necessary stability and alignment for effective surface treatment. It supports the workpieces during blasting, ensuring that areas can be uniformly exposed to the abrasive. Furthermore, the design allows for the adjustment of parameters such as the abrasive flow rate and angle of projection, which are critical for achieving the desired surface finish.

In contrast, the other options pertain to different concepts not directly related to centrifugal blast setups. For instance, a rotary compressor is more associated with pneumatic systems and air pressure management rather than abrasive blasting, while frame structures and linear actuators serve different mechanical and automation functions unrelated to the specific process of centrifugal blasting.