Main functions and maintenance tips of hollow rotary actuator

1.Brief of the hollow rotary actuator.

A hollow rotary actuator is a type of rotary actuator that features a hollow output shaft, allowing for the routing of cables, wiring, or piping through the center of the rotating component. This design simplifies integration with other systems and reduces the overall size and complexity of equipment. These actuators are frequently used in applications requiring high precision and compact design, such as robotics, semiconductor manufacturing, and automation. 

2.Working principle of hollow rotary actuator

1.Motor:The actuator is powered by a motor, which can be a stepper motor for precise positioning or a servo motor for higher torque and speed. 

2.Transmission:The motor's rotational power is transmitted to the output shaft through a gear mechanism. This mechanism can be a worm gear, a gear train, or other suitable system, depending on the required torque, speed, and precision. 

3.Hollow Shaft:The key feature is the hollow shaft, which allows for the passage of cables, wires, pneumatic lines, or other components. 

4.Rotation:As the motor rotates, the transmission mechanism rotates the hollow output shaft, enabling the desired angular movement of the connected load.    

3.Main functions of hollow rotary actuator

1.Simplifying Wiring and Piping:The hollow shaft allows for cables, air hoses, and other components to pass through, eliminating the need for external routing and simplifying the overall system design.This is especially helpful in space-constrained applications or where neat and organized wiring is crucial. 

2.High Precision Positioning:Many hollow rotary actuators are designed for high-precision positioning, often incorporating stepper motors or servo motors for accurate and repeatable movement.They can handle large inertia loads, such as rotating tables or arms, while maintaining accuracy. 

3.Space Efficiency:The integrated design of the actuator and the hollow shaft reduces the overall footprint of the system, making it ideal for compact or space-constrained applications.This can lead to smaller, lighter, and more efficient equipment. 

4.Reduced Design and Assembly Time:By incorporating the hollow rotary actuator, designers can eliminate the need for external mounting hardware, such as couplings or belts, reducing the complexity of the system.This also simplifies assembly and reduces the time required for installation and adjustments. 

5.Increased Productivity:The simplified design and ease of integration translate to faster design cycles, reduced assembly time, and potentially lower overall costs.The ability to handle large inertia loads with high precision also contributes to increased productivity in automated systems.  

4.Maintenance tips of hollow rotary actuator

1.Lubrication:Hollow rotary actuators often require specific types of grease or oil. Refer to the manufacturer's specifications for the correct type and quantity. Regularly check for grease leaks, especially if the actuator is installed in a position where leakage could cause contamination. 

2.Oil Level Check:If your actuator uses oil, check the oil level regularly. Locate the oil level screw plug and remove it to check the oil level. If the oil level is low, add the correct amount of the specified oil. Ensure the actuator is cool before checking the oil level, especially after operation. 

3.Visual Inspection:Regularly inspect the actuator for any signs of wear, damage, or loose components. Check the mounting screws and ensure they are tightened to the correct torque. Look for any unusual noises or vibrations during operation, which could indicate a problem. 

4.Correct Installation:Ensure the actuator is mounted correctly using the specified mounting holes and screws. Avoid using the positioning pins to remove or loosen the actuator, as this can affect positioning accuracy. 

5.Environmental Considerations:Keep the area around the actuator clean and free of debris. Avoid operating the actuator in extreme temperatures or environments that could damage it. If the actuator is used in an environment with potential hazards (e.g., flammable materials), take appropriate safety precautions. 

6.Safety Precautions:Always disconnect the power supply before performing any maintenance or inspection. Do not touch the actuator or its moving parts during operation. Use the correct actuator and driver combination as specified by the manufacturer.

Source:https://blogg.alltforforaldrar.se/randolph/2025/07/30/main-functions-and-maintenance-tips-of-hollow-rotary-actuator/