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Compressed air enters the cylinder, pushing the piston to move in a straight line. The piston uses the piston pin and the U-shaped groove design of the shift fork to convert the linear motion of the piston into the rotational motion of the shift fork. The rotation of the shift fork drives the output shaft to rotate, thereby achieving control of the valve.
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According to the different types of action, it can be divided into single acting fork type pneumatic actuators and double acting fork type pneumatic actuators. The switch action of the actuator is driven by the air source, which is a double acting fork type pneumatic actuator; And only the opening action is driven by the air source, while the closing action, as a spring reset, is a single acting fork type pneumatic actuator.
According to different structures, it can be divided into single cylinder piston type and double cylinder piston type.
According to the different main materials, it can be divided into aluminum alloy type, stainless steel type, carbon steel type, etc.
When the torque requirement exceeds 7000Nm, gear rack actuators often do not meet cost-effectiveness. For this reason, it is generally recommended to choose high-power fork type pneumatic actuators when selecting pneumatic actuators, which can provide higher torque output.
The symmetrical and inclined steel fork mechanism of high-power fork type pneumatic actuators allows for two types of torque output characteristics. Among them, the inclined steel fork mechanism has a very high starting torque and a low operating torque, which is suitable for controlling butterfly valves; The symmetrical steel fork mechanism has a more balanced torque curve and is mainly suitable for controlling ball valves and plug valves.
The process of aluminum alloy fork pneumatic actuator mainly includes the following aspects:
1、 Material selection and preparation
1. Aluminum alloy material:
Choose high-strength and corrosion-resistant aluminum alloy materials, such as 6061 and 7075 aluminum alloys. These aluminum alloys have good mechanical and processing properties, which can meet the requirements of pneumatic actuators under different working conditions.
Inspect aluminum alloy materials to ensure that their chemical composition, mechanical properties, etc. meet the standard requirements.
2. Other components:
Prepare other components required for pneumatic actuators, such as seals, bearings, pistons, etc. The quality of these components directly affects the performance and reliability of pneumatic actuators.
Pre treatment such as cleaning and deburring of components to prepare for subsequent processing.
2、 Processing technology
1. Casting:
For some complex shaped aluminum alloy fork pneumatic actuator components, casting technology can be used. Casting can produce parts with complex shapes and high dimensional accuracy, while also improving material utilization.
Choose appropriate casting methods, such as sand casting, die-casting, etc. During the casting process, it is important to control parameters such as casting temperature and pressure to ensure the quality of the castings.
2. Mechanical processing:
Mechanical processing of cast or forged aluminum alloy parts to achieve the required dimensional accuracy and surface quality. Mechanical processing includes processes such as turning, milling, drilling, tapping, etc.
Adopting advanced processing equipment and cutting tools to improve processing efficiency and accuracy. At the same time, attention should be paid to cooling and lubrication during the processing to prevent part deformation and surface damage.
3. Surface treatment:
Surface treatment of aluminum alloy parts to improve their corrosion resistance and appearance quality. Surface treatment methods include anodizing, electroplating, spraying, etc.
Choose the appropriate surface treatment method based on different usage environments and requirements. For example, in corrosive environments, anodizing treatment can be used to improve the corrosion resistance of parts.
3、 Assembly process
1. Component cleaning:
Before assembly, clean all components to remove surface oil stains, impurities, etc. Cleaning can be done using methods such as ultrasonic cleaning and solvent cleaning.
The cleaned parts should be dried to prevent residual moisture from affecting the assembly quality.
2. Assembly:
Assemble each component according to the assembly process requirements. During the assembly process, attention should be paid to the installation sequence and direction of the components to ensure correct assembly.
Use appropriate assembly tools and equipment to ensure assembly accuracy and quality. For example, when installing seals, specialized installation tools should be used to prevent damage to the seals.
3. Debugging:
After assembly, debug the pneumatic actuator. Debugging includes sealing testing, action testing, etc. By debugging, ensure that the performance and reliability of the pneumatic actuator meet the requirements.
4、 Quality control
1. Raw material inspection:
Strictly inspect raw materials to ensure their quality meets standard requirements. The inspection content includes chemical composition analysis, mechanical property testing, dimensional accuracy testing, etc.
2. Inspection of Processing Process:
During the processing, inspect each process to ensure that the processing quality meets the requirements. The inspection content includes dimensional accuracy, surface quality, geometric tolerances, etc.
3. Assembly process inspection:
During the assembly process, inspect the assembly quality to ensure that each component is installed correctly and sealed properly. The inspection content includes sealing test, action test, appearance quality, etc.
4. Finished product inspection:
Conduct a comprehensive inspection of the finished product to ensure that the performance and reliability of the pneumatic actuator meet the standard requirements. The inspection content includes sealing test, action test, pressure test, no-load test, load test, etc.
Through the above process, high-quality aluminum alloy fork pneumatic actuators can be produced to meet the needs of different users
