The internal structure of a cold-resistant pneumatic hoist can vary depending on the specific design and manufacturer. However, I can provide you with a general overview of the components commonly found in pneumatic hoists designed for cold environments:

1. Housing and Casing: The outer casing is typically made from materials that can withstand low temperatures. This includes materials that are resistant to corrosion and can maintain their mechanical properties in cold conditions.

2. Motor: The motor in a pneumatic hoist is powered by compressed air. Cold-resistant hoists may have specially designed motors that can operate efficiently in low temperatures. Lubrication systems are often adapted for cold environments to ensure smooth operation.

3. Pneumatic System: This includes the air compressor, valves, and air reservoir. The components are designed to handle the challenges posed by cold temperatures, such as potential freezing of moisture in the air.

4. Braking System: Cold-resistant hoists may use specific braking systems designed to function effectively in low temperatures. This is crucial for maintaining control and safety during lifting and lowering operations.

5. Load Chain or Wire Rope: The lifting medium, whether it's a load chain or wire rope, is selected based on its ability to withstand cold temperatures without becoming brittle or losing strength.

6. Control System: The control system can include buttons, levers, or a remote control for operating the hoist. In cold-resistant hoists, these components are designed to be operable in low temperatures, and they may have additional insulation.

7. Seals and Gaskets: Special seals and gaskets are used to prevent moisture ingress and maintain the integrity of the internal components. These are crucial for preventing freezing and ensuring the longevity of the hoist.

8. Cooling Systems (if applicable): In certain cases, cold-resistant hoists may incorporate heating elements or other systems to prevent the buildup of ice or frost on critical components.

It's important to note that the specific features and design considerations for cold-resistant pneumatic hoists can vary among manufacturers. For detailed information on a particular hoist model, it's recommended to refer to the product documentation provided by the manufacturer.