Friday, February 3, 2012

Difference between Actuator and Cylinder

Actuator is a kind of motor for controlling or moving a system or mechanism. Some models of actuators of a variety of agents comprise: hands, human - arms, legs, fingers, Grasping mechanism of Part picking robot, moving parts. These models include voice coil and solenoids actuators.

In the engineering field, actuators are a transducers subdivision. They are tools which convert an input signal into motion. Motors of electrical, actuators of pneumatic, pistons of hydraulic, comb drive, relays, actuators of piezoelectric, Digital Micro mirror Devices thermal bimorphs, and polymers of electro active are some models of the actuators. Motors are typically utilized when round motions are required, but can also be applied for linear applications by converting round to linear motion with a screw and bolt transducer. In other case some actuators are essentially linear, for example actuators of piezoelectric. In virtual instrumentation sensors and actuators are the hardware substitutes of virtual instruments. Virtual instruments of computer programs utilize motion into linear motion or vice versa. Translation is generally created through a few simple kinds of mechanism involving:
• Axle and wheel: hoist, chain drive, winch, drive of belt, rigid chain and belt actuators work on the axle and wheel principle. By rotating a axle or wheel such as, gear, drum, shaft or pulley, a linear member such as, rack, cable, belt or chain, moves. The wheel and axle rotates by moving the linear member.
• Screw: Ball screw, screw jack, and roller screw actuators all run on the simple machine principle known as the screw. The screw shaft moves in a line by rotating the nut of actuator. The nut rotates by moving the screw shaft.

Hydraulic cylinder, it is also called a linear hydraulic motor. Hydraulic cylinder is a mechanical actuator that is utilized to provide a force of unidirectional via a stroke of unidirectional. It has a lot of applications, particularly in engineering automobiles.

Cylinders acquire their power from hassled hydraulic fluid, which is characteristically oil. It consists of a barrel of cylinder, in which a piston linked to a rod of piston goes back and forth. The barrel is locked on every end by the bottom of cylinder and by the head of cylinder where the rod of piston moves out of the cylinder. The piston has sliding seals and rings. It separates the cylinder inside in 2 chambers, the piston rod side chamber or rod end and the bottom chamber or cap end. The pressure of hydraulic proceeds on the piston to do linear motion and work.

Flanges, clevises and/or trunnions, are installed to the body of cylinder. The rod of piston also has installing attachments to join the cylinder to the machine component or object that it is pressing.

The cylinder is the motor or actuator side in this system. The side of generator in the hydraulic system is the pump of hydraulic which gets in a regulated or fixed flow of oil to the hydraulic cylinder bottom side, to shift the piston rod upwards. The piston drives the oil in the chamber back to the reservoir. If we think that the pressure of oil in the rod chamber piston is around zero, the force (F) on the rod of piston equals the piston area (A) times the pressure (P) in the cylinder.

The piston goes instead downs if oil is forced into the side of piston rod chamber and the oil from the area of piston moves back to the reservoir with no pressure. The pressure of fluid in the area of piston rod chamber (P) is Pull Force (Fp) divided (piston area (Ap) times piston rod area (Ar)). Where the formula is P=F/A2.

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