Working principle and structure of rotary pneumatic actuator.
Working Principle of rotary pneumatic actuator:
The working principle of rotary pneumatic actuator is mainly based on the power conversion of compressed air. When compressed air enters the actuator, the pressure energy of the compressed air is converted into mechanical energy of rotational motion through the internal pneumatic mechanism, thereby generating rotational torque. This process usually involves the following key steps:
- Air source input: Compressed air enters the actuator through the air inlet.
- Pressure conversion: Inside the actuator, the pressure of the compressed air acts on a specific component (such as a piston or rotor) to cause it to move.
- Motion transmission: Through the gear mechanism or other transmission devices, the linear motion of the piston or rotor (in some designs) or its own rotary motion into the rotary motion of the output shaft.
- Torque output: Ultimately, the output shaft of the actuator outputs torque in the form of rotation to drive the connected equipment or mechanism to work.
Main components of a rotary pneumatic actuator:
rotary pneumatic actuator is mainly composed of cylinders, pistons (some designs have), gear mechanisms, bearings and seals.
The cylinder is the main body, providing space for compressed air to act, focusing on pressure bearing and sealing performance.
In the design with piston, the piston converts the compressed air pressure energy into linear motion energy, which is then converted into rotational motion through a gear mechanism. The gear mechanism is a key component responsible for converting linear or initial rotational motion into the required rotational output, determining the output torque and rotation direction.
Bearings support rotating parts, reduce friction and wear, and ensure smooth movement.
Seal prevents compressed air from leaking and maintains normal operation.
When working together, compressed air first enters the cylinder and acts on the piston (if included in the design) or other directly loaded components. The movement of these components is transmitted and converted through the gear mechanism, and finally the rotational torque is output. Throughout the process, seals ensure that compressed air does not leak and bearings ensure smooth rotation.
Technical specifications and selection guide for rotary pneumatic actuators.
rotary pneumatic actuator technical specifications:
1. Torque output
rotary pneumatic actuator is available in different torque output ranges to meet a wide range of applications. From the low torque requirements of small equipment to the high torque needs of large installations, there are corresponding models to choose from. The rotary pneumatic actuator has high torque accuracy and can stably output the required power.
2. Angular travel
rotary pneumatic actuator typically has an angular travel of 0° to 90° or 0° to 180°, with larger angular strokes available for special applications. Good angle accuracy ensures accurate control of equipment movements.
3. Work pressure
The general working pressure of rotary pneumatic actuators is between 2 and 10 bar. They can adapt to different air source pressure conditions to ensure stable operation.
4. Working temperature
rotary pneumatic actuator can operate in temperatures ranging from -20°C to 80°C. Moreover, rotary pneumatic actuator is available in models for special temperature environments to meet the temperature requirements of different application scenarios.
5. Response time
rotary pneumatic actuator open and close time is short, generally within a few seconds, and can respond quickly to control signals, improving system efficiency.
6. Control method
rotary pneumatic actuator includes switch type control and regulating type control. The switch type is suitable for simple on/off operation, and the regulation type can achieve continuous Angle adjustment to meet the needs of precise control.
7. Installation dimensions and connection methods
rotary pneumatic actuators has various installation sizes and needs to be selected according to the actual equipment to ensure convenient and reliable installation. rotary pneumatic actuator connection methods include flange connection, threaded connection and welding connection to meet different installation requirements.
8. Protection level and explosion-proof level
The degree of protection is indicated by the IP code, which provides a certain degree of protection against dust, water and corrosion. In hazardous environments, actuators with explosion-proof ratings can be selected to ensure safe operation.
What factors should be considered when selecting a rotary pneumatic actuator?
The main factors to consider when selecting a rotary pneumatic actuator include:
- Torque requirements: Ensure that the rotary pneumatic actuator can provide sufficient torque to drive the load and consider torque reserves to cope with extreme working conditions.
- Speed requirements: Match the rotation speed of the rotary pneumatic actuator with the requirements of the application scenario. Which including starting, running and stopping speeds.
- Installation space: Consider the size, installation method and layout requirements of the rotary pneumatic actuator to ensure that there is enough installation space on site.
- Environmental conditions: Evaluate the temperature, humidity, corrosiveness, vibration and other factors on site, and select a rotary pneumatic actuator model that can adapt to these conditions.
In addition, factors such as control accuracy, reliability, maintenance costs, and supplier service quality may also need to be considered.
Installation, operation and maintenance of the rotary pneumatic actuator.
1. Installation Guide
Preparation before installation:
• Check whether the rotary pneumatic actuator and accessories are complete and intact, and confirm that the model and specifications meet the requirements.
• Clean the installation site to ensure there is no debris, dust or other factors that may affect the installation.
• Prepare the tools required for installation, such as wrenches, screwdrivers, sealants, etc.
• Be familiar with the installation instructions and understand the installation process and precautions.
Installation steps:
• Determine the installation location to ensure that the actuator is easily accessible and connected to the controlled equipment.
• Secure the rotary actuator to the mounting location using appropriate fasteners to ensure a secure fit.
• Connect the air source pipeline, paying attention to the tightness and correctness of the connection.
• Connect the rotary pneumatic actuator to the controlled device and adjust the connection angle and position.
• Perform preliminary commissioning to check whether the rotary pneumatic actuator operates normally.
• When a problem occurs, stop using it immediately and conduct troubleshooting and repairs. Though reasonable operation and maintenance can extend the service life of the rotary pneumatic actuator and ensure its stable and reliable operation.
Safety precautions:
• Ensure that the air source is turned off before installation to avoid accidental start-up.
• Avoid impact or excessive force on the rotating pneumatic actuator during installation.
2. Operation skills and maintenance plan
Operative tips:
• Operate the gas source switch correctly to avoid frequent and rapid switching.
• Observe the action of the rotary pneumatic actuator to ensure smooth operation and no unusual noise.
• Avoid overloading and do not exceed the rated torque and angle of the rotary pneumatic actuator.
Maintenance Plan:
• Regularly check the appearance of the rotary pneumatic actuator for damage, leakage, etc.
• Clean the surface of the rotary pneumatic actuator to prevent dust and impurities from accumulating.
• Check the seals and replace them if they are worn.
• Lubricate moving parts to keep them in good working condition.
• Perform regular commissioning and calibration to ensure accuracy.
• When problems occur, stop using them in time and perform troubleshooting and repairs. Proper operation and maintenance can extend the service life of rotary pneumatic actuators and ensure their stable and reliable operation.
Product introduction of rotary pneumatic actuators recommended by HANUMAN:
HANUMAN would like to recommend the AT series double acting for butterfly valve ball valve pneumatic rotary actuator.
The extruded aluminum alloy cylinder body is hard-oxidized, with a hard surface and strong wear resistance. The compact double-piston gear and rack structure features precise meshing, smooth transmission, symmetrical installation position, and constant output torque.Can be equipped with butterfly valve, ball valve, damper, flapper valve, plug valve, shutter valve, etc.
- AT series pneumatic rotary actuators are developed, researched and designed based on the comprehensive application of new technologies, new materials, new processes and innovative concepts at home and abroad.
- Fully compliant with the latest international standards: ISO5211, DIN3337, VDI/VDE3845, NAMUR standards.
- All moving surfaces are made of high-quality bearings with low friction, long life and no noise.
- The piston and end cover are made of die-cast aluminum alloy, which has high strength and light weight.
- Two independent stroke adjustment mechanisms are installed externally, which can conveniently adjust the fully open or fully closed position by ±5.
If you have any demand for rotary pneumatic actuators or other products, please consult HANUMAN for more information about the products!
