sc cylinder pressure calculation formula
SC cylinder Thrust force on the piston rod F1=π/4×D2×P×ß (N )
< strong>SC cylinderThe pulling force on the piston rod F2=π/4×(D2-d2)×P×ß(N)
F1: Thrust force when the piston rod is pushed out
F2: The pulling force when the piston rod is pulled back
D: cylinder tube inner diameter (piston diameter)
d: piston rod diameter
P: Air source pressure
ß: load rate (ß=65% at slow speed and ß=30% at fast speed)
sc cylinder thrust comparison table
Determine the push and pull forces on the piston rod according to the force required for the work. Therefore, the cylinder should be selected so that the output force of the cylinder has a slight margin. If the bore diameter is selected to be small, the output force will be insufficient and the cylinder will not work properly;but if the bore diameter is too large, it will not only make the equipment bulky and costly, but also increase air consumption, resulting in a waste of energy. When designing the clamp, a force-increasing mechanism should be used as much as possible to reduce the size of the cylinder.
The following is the calculation formula for the theoretical output of the cylinder:
F: Cylinder theoretical output force (kgf)
F′: output force (kgf) when efficiency is 85% - (F′=F×85%)
D: Cylinder bore (mm)
P: Working pressure (kgf/cm2)
Example: When the working pressure of a cylinder with a diameter of 340mm is 3kgf/cm2, what is its theoretical output force? What is the output force?
Connect P and D and find the points on F and F′, we get: F＝2800kgf;F′＝2300kgf
When selecting the cylinder bore during engineering design, the cylinder bore can be selected based on its operating pressure and theoretical thrust or pulling force, from the experience table 1-1Detected in.
Example: There is a cylinder whose operating pressure is 5kgf/cm2. When the cylinder is pushed out, its thrust is 132kgf (cylinder efficiency is 85%). Question: What cylinder diameter should be selected?
●From the cylinder thrust of 132kgf and the cylinder efficiency of 85%, the theoretical thrust of the cylinder can be calculated as F＝F′/85%＝155(kgf)
●Composed of operating pressure 5kgf/cm2 and CylinderTheoretical thrust, find out and select a cylinder with a bore of 63 to meet the usage requirements.
