A device that is used for transforming hydraulic power into mechanical power, which is angular speed and torque, is known as hydraulic rotary actuator.
A hydraulic rotary actuator is mainly utilized for substitute movements together with a restricted rotation angle, which can be a maximum of 120 degrees. This kind of rotary actuator is constructed in a very simple way, and this simple construction enables the actuator in obtaining pretty high mechanical competence as compared to the conventional system of hydraulic cylinder-rack. The main features of this sort of actuator include small dimensions on the whole, a steadiness of supplied torque at the time of operation, and last but not the least, these are reasonably priced. There are many recognized manufacturers of this type of actuator. There are some actuators, in which transmission devices is absent amid the actuator and the utilizer. Due to this reason, the mechanical effectiveness allows to acquire an exact value of torque.
A good quality hydraulic rotary actuator can be a suitable choice for most of the advanced applications related to automation, especially where higher level of quality and reliability are required. A hydraulic rotary actuator can be applied positively in place of reducers as well as quick motors. When the element of reducer is eliminated, then this also result into reduction of costs and will lead to less maintenance charges as well. This also permits the reduction of dimensions.
There are many different applications where a hydraulic rotary actuator can be used. Some of these applications include industrial automation machinery, back hoes, presses, crane spreaders, machines for injection molding, and hydraulic lift. When it comes to the construction of the hydraulic rotary actuator, these are available in double or single vane. A single vane construction provide better rotation angle, whereas, a double vane construction decides the diminution of rotation angle. However, a double vane construction can increase the supplied torque to a considerable extent, as the external dimensions are equal. The main elements of construction of a hydraulic rotary actuator include casting the body of the actuator, followed by the head, then the bushing, the dust seal, the shaft seal, the seal, moving vane, and so on.
There are some special applications that call for some special kind of hydraulic rotary actuator. For such applications, actuators can be customized to make it apposite for that particular application. For example, there are actuators that are suitable for bearing axial or radial loads. Some actuators have rotation angle, which is unlike the standard rotary angle. There are even some actuators that comprise of shafts and holes different from the standard rotary actuators. Some of these are also designed for higher speed as well.
One of the most common applications of this type of actuator is flipper motion for the spreaders. The rotary actuators have special valves that are directly assembled on it, which keeps the spreader safe from pipe damages and also put forward an effectual anti-shock defense. For most of the applications, which need defined angle and higher torque, the best option will be a hydraulic rotary actuator. Different types of rotary actuators are also differentiated on the basis of the type of shaft. Other considerations that have to be kept in mind while selecting rotary actuators ate rotation angle, displacement, weight of the actuator without oil, and torque.
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