What is a hydraulic rotary actuator
Release time:
Jan 03,2025
Source:
Helical hydraulic rotary actuators usually refer to helical swing hydraulic cylinders. Here is a detailed introduction:
Helical hydraulic rotary actuators usually refer to helical swing hydraulic cylinders. Here is a detailed introduction:
Working Principle
Helical hydraulic rotary actuators mainly consist of a cylinder body, a piston, a helical rod, an output shaft and so on. When hydraulic oil enters the cylinder body and pushes the piston to move, due to the meshing of the helical teeth on the inner surface of the piston with those on the helical rod, the piston will move linearly along the helical rod and rotate at the same time under the action of hydraulic pressure. This drives the helical rod of the output shaft to rotate simultaneously, thus converting the linear motion of the piston into the rotational motion of the output shaft.
Performance Characteristics
• Large Output Torque: It can output a relatively large torque within a relatively small space and can meet the requirements of some equipment that needs high-torque rotational motion. For example, a powerful helical swing cylinder can turn 20 Volkswagen Golf cars from one side to the other.
• High Positioning Accuracy: Through precise manufacturing processes and control, a high rotational angle accuracy can be achieved. For instance, there are special swing hydraulic cylinders with an accuracy of one-tenth of a degree.
• Compact Structure: The overall structural design is compact, taking up little space, and it is easy to install and use in various types of equipment, making it suitable for occasions where space is limited.
• Smooth Operation: With the transmission of the helical pair, the movement is smooth, and the vibration and noise are relatively low, which can make the operation of the equipment more stable.
• High Working Pressure: Its sturdy and well-sealed housing can withstand a working pressure of up to 350 bar and is able to adapt to harsh working conditions.
Application Scenarios
• Construction Machinery Field: They are widely used in equipment such as excavators, cranes, and aerial work platforms to realize the rotational movements of working devices, such as the rotation of the bucket of an excavator and the rotation of the boom of a crane.
• Shipbuilding Industry: They are used in the rudder systems of ships, the opening and closing control of hatch covers, ship loading and equipment operation, etc., and can provide reliable rotational power in a limited space.
• Underground Work and Underwater Exploration: In coal mining excavation equipment, underwater exploration devices and offshore platforms and other harsh environments, their high reliability and large torque output capabilities enable them to operate stably.
• Special Robots: For example, in some special robots that need to perform rotational operations in complex terrains or narrow spaces, helical hydraulic rotary actuators can be used as the driving elements of their joint parts to achieve precise rotational motion control.
• Food and Pharmaceutical Industries: In the pharmaceutical and food processing industries that require high cleanliness and hygiene, they can be used to drive the rotating parts of some equipment, such as the rotating shafts of mixers and filling machines.
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