Hydraulic Rotary Actuator for Small Excavator

Rotary Hydraulic Actuator

The "Rotary actuator" is a hydraulic actuator installed on the swing system of a small excavator, used to control the swing motion of the excavator.
The specific position of the rotary actuator on a small excavator is between the excavator body and the upper rotating platform, commonly referred to as the slewing bearing. A rotary actuator is a type of rotary actuator used to generate rotational motio. It usually consists of a hydraulic motor and a gear transmission device. The hydraulic motor converts hydraulic energy into mechanical energy through the hydraulic system, driving the gear transmission device and generating rotational torque. The main function of a rotary actuator is to control the rotational motion of objects, such as controlling the rotation of the upper rotating platform of an excavator. It plays a role in controlling the rotation of the excavator.

The working principle of the rotary actuator is as follows:

1. Hydraulic drive: The rotary actuator has a hydraulic motor and gear transmission device inside. Through the hydraulic oil flow and pressure provided by the hydraulic system, the hydraulic motor converts hydraulic energy into mechanical energy, driving the gear transmission device.
2. Gear transmission: Gear transmission is a key part of the rotary actuator. The hydraulic motor is connected to the gear transmission device through an output shaft, transmitting hydraulic energy to the gear. The gear transmission device converts hydraulic energy into rotational torque, driving the rotation of the upper rotating platform of the excavator.
3. Control and adjustment: Rotary actuators are usually equipped with hydraulic valves and sensors to control and adjust the rotational speed and direction. The hydraulic valve controls the inflow and outflow of hydraulic oil, thereby controlling the movement of the rotary actuator. Sensors can monitor the position and speed of rotary actuators and provide feedback signals to the system.

Through hydraulic drive and gear transmission, the rotary actuator can achieve the platform rotation of the excavator, allowing it to rotate flexibly and cover a larger range on the work site. The rotary actuator works reliably and accurately, providing important functions for excavator operation and control.

Specification of Rotary Actuator

Bore diameter: 50mm～120mm
Rod diameter: 25mm～75mm
Stroke≤1000mm
Maximum 333KN
Pressure29.4MPa

Rotary Actuator VS Hydraulic Cylinder

There are the following differences in the working principle between hydraulic cylinders and rotary actuators:

1. Motion type: The hydraulic cylinder produces linear motion, while the rotary actuator produces rotational motion. The hydraulic cylinder uses hydraulic pressure to cause the piston to move linearly back and forth within the cylinder barrel, achieving the push pull or lifting of objects; The rotary actuator converts hydraulic energy into rotational torque through hydraulic pressure and gear transmission, achieving the rotational motion of the object.
2. Structural design: Hydraulic cylinders typically consist of a piston and a rod connecting the piston. The inflow and outflow of hydraulic oil causes the piston to move within the cylinder barrel, resulting in linear motion. A rotary actuator usually consists of a hydraulic motor and a gear transmission device. The hydraulic motor drives the gear transmission device through hydraulic energy, converting hydraulic energy into rotational torque and achieving rotational motion.
3. Motion control: The motion control of hydraulic cylinders is usually achieved by controlling the inflow and outflow of hydraulic oil. The hydraulic valves in the hydraulic system can control the flow and direction of hydraulic oil, thereby controlling the direction and speed of hydraulic cylinder movement. The motion control of rotary actuators is usually achieved by controlling the hydraulic oil supply to the hydraulic motor. Adjusting the flow and pressure of hydraulic oil can control the speed and steering of the rotary actuator.

Overall, the main difference in working principle between hydraulic cylinders and rotary actuators lies in the types of motion generated and their corresponding structural design. The hydraulic cylinder generates linear motion, while the rotary actuator generates rotational motion. They achieve their respective functions through different mechanisms and hydraulic control methods.

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