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Here are the common methods to control the
speed and damping in rotary pneumatic actuators:
Speed Control
Flow Control Valves: Installing flow
control valves in the pneumatic circuit is a typical approach. By adjusting the
opening degree of these valves, the flow rate of compressed air entering or
exiting the actuator can be regulated. A smaller opening allows less air to
flow, resulting in a slower rotation speed of the actuator, and vice versa.
Pressure Regulation: Controlling the supply
pressure of compressed air can also affect the speed. Reducing the pressure
will decrease the force exerted on the actuator's internal mechanism, leading
to a lower rotation speed. This can be achieved by using pressure - regulating
valves to set the appropriate pressure level according to the required speed.
Damping Control
Damping Devices: Special damping devices,
such as hydraulic dampers or air - spring dampers, can be added to the actuator
system. These dampers absorb the kinetic energy generated during the rotation
of the actuator, reducing vibrations and impacts. They are particularly useful
when the actuator needs to stop quickly or operate in a high - precision
environment.
Programmable Logic Controllers (PLCs):
Advanced control can be achieved by using PLCs. They can be programmed to
adjust the actuator's speed and damping in real - time based on specific
process requirements. For example, during the final stage of rotation, the PLC
can gradually reduce the speed and increase the damping to achieve a smooth
stop.
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