Fundamentals of pneumatic cylinders Flashcards
What are pneumatic cylinders?
pneumatic cylinders and actuators work when compressed air is forced into the cylinder or actuator itself in order to move a piston housed within it
Components of pneumatic cylinder?
Key components of a pneumatic actuator include an end cap, a piston, a piston rod, a cylinder barrel, a wiper seal and a cushion sleeve and seal.
Single acting cylinder
A single acting pneumatic cylinder or actuator has one port, where the air enters and then pushes the piston in one direction only. The piston is then returned to its original position by a spring. These pneumatic cylinders have limited stroke length so are useful for slower operations. They also use less air which gives optimum efficiency and lower operating costs.
Double Acting Cylinder
A double acting pneumatic actuator or cylinder has two ports which allow pressure to be applied in order to pull the piston in the opposite direction to the one created by the first port, otherwise known as an instroke and an outstroke.
Key factors in the selection of a pneumatic cylinder or actuator
1, type of motion.
2, pressure and flow.
3, Environmental Factors.
4, Applications.
Types of pneumatic cylinders
ISOLine Profile & Tie-Rod Cylinders: the most commonly found cylinder in industrial automation and are high performing, long lasting and able to operate in high temperatures.
Roundline Cylinders: Ideally suited to lighter duties and in lower force applications, roundline cylinders are available as single or double acting.
Compact Cylinders: Suited to machinery where space is a premium consideration, Norgren’s range includes a compact cylinder that is one third of the length of an equivalent standard ISO profile actuator.
Integrated Valve & Actuator (IVAC): The IVAC combines a linear actuator, a glandless control valve and two reed or solid state switches and speed controllers in one integrated product. With increased energy efficiency, it also means the number of parts required is reduced while still maintaining the ISO 15552 dimension standard.
Rotary Actuators: Double acting, the rotary actuator provides an angular or turning motion and is available in rotary vane or rack & pinion versions.
Rodless Cylinders: This double acting linear cylinder is both light weight and high strength, with 8 bore sizes.
Stainless Steel Roundline Actuators and Stainless Steel ISO Tie-Rod Linear Actuators: For use in highly corrosive environments, such as the food industry or pharmaceuticals, the stainless steel ISO roundline actuators conform to ISO 6432.
accesories
Neck mount, foot mount, flow regulators, and sensors
Pneumatic cylinder force range
50psi to 999psi
Formula for piston force
F effec = P × (π/4) × D² - Ff - Fs.
