Procedures for Choosing a Hydraulic Cylinder
Determining the Inside Diameter of a Cylinder
Tables of Theoretical Areas and Outputs of Cylinders
Determining the Diameter of a Piston Rod
When using a hydraulic cylinder, the compressive stress and buckling by the cylinder stroke should be taken into account. The piston rod shaft is like a long column. Therefore, even if it is made of tensile strength steel or heat-treated, its strength does not become stronger. keep in mind that using a piston shaft having a larger diameter is the only way to maintain the buckling strength of a piston rod.
The graphs shown below indicate safe maximum strokes, based on Oiler迦s formula applicable to a upright long column, when an optimal compressive load is applied to the diameter of each piston rod. It is necessary to modify the values of strokes so that they can come up to the working conditions such as special devices or impact load. For example, when the ?쐅uide??is enough with the use of a vertical cylinder, the stroke may be increased by 1/3, and when an impact load is applied due to horizontal mounting, the1/3 of the indicated value may be applicable.
Supporting Status of Cylinder
Cautions about the Buckling of the Piston Rod
It is necessary to review how the cylinder stops before calculating the buckling of the piston rod. There are two ways to stop the cylinder; one is the cylinder stop type in which the cylinder is stopped by the stroke end of the cylinder, and the other is the external stop type in which the cylinder is stopped by an external stopper. Type of accident varies depending on the stopping types.
Buckling Graph of the Piston Rod
Choosing a Packing Material
Choosing a Port Diameter by Cylinder Speed
The cylinder speed is determined by the flow rate of oil to be flown into the cylinder. Therefore, the diameter of a port should be so selected that it is the standard diameter.
The graph shows the relations between the diameter of a port and pipe flow speed for required flow rate and speed by each dimensions of standard hydraulic cylinders.
To reduce the pressure loss, if the size of pipe increases to cylinder port, it will be effective. The calculation of flow speed sets up pipe sch 80. Generally, if the pipe flow speed exceeds 7m/sec, the pipe resistance becomes high and the pressure loss become great. Consequently, the output becomes low and the speed becomes low therefore, the pipe flow speed should not exceed 7m/sec.
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