The internal components of the pneumatic hoist mainly include the following parts:

Pneumatic motor: The power component of the pneumatic hoist, which converts the energy of compressed air into mechanical energy and drives the planetary reducer.

Planetary reducer: Reduce the speed of the pneumatic motor to a suitable range to control the lifting and walking speed of the hoist.

Hanging assembly: The core component of the pneumatic hoist, including brakes, lifting chains, hook assemblies, etc., used for carrying heavy objects and positioning.

Brake: used to control the positioning and braking of the suspension assembly, ensuring the safety of lifting operations.

Lifting chain: used to connect the hook assembly and heavy objects, transmitting lifting force.

Hook assembly: used to connect lifting chains and heavy objects, achieving lifting and lowering operations.

Main control valve: used to control the lifting, walking and other actions of the pneumatic hoist, and to control the movement of the brake and pneumatic motor by manipulating the main control valve.

In addition, the pneumatic hoist also includes components such as a walking mechanism, active wheels, passive wheels, and wall panels. 

The main control valve controls the pneumatic motor and planetary reducer to drive the active wheels to move horizontally when lifting heavy objects.