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- Long stroke fixed or pivot mounted cylinders tend to buckle on push
- loading applications, resulting in high bearing loading at the rod
- gland or the piston. In order to reduce these bearing loads, the use
- of a stop tube to lengthen the distance between the gland and piston
- when cylinder rod is fully extended is highly recommended.
-
- The program automatically determines the need for the stop tube. If
- the stop tube is required for particular cylinder application its
- length will be shown on Cylinder Data - Page 3 of 5 screen. The
- value of Column Strength is calculated and shown on the same page.
- The program compares values of Column Strength and Extending Force
- (page 2 of 5) and generates warning message if buckling is likely on
- push loading application.
-
- On Figure graphs represent the column strength of various piston
- rods as a function of Stroke and Axial Thrust and show how buckling
- effects are incorporated into the program. Coloured bands are valid
- ones for corresponding piston diameters whose sizes are marked with
- the same colour and shown below the diagram. Please note that not
- all values of piston rod are shown on diagram, some of them are
- removed just for the sake of clarity.
-
- Axes on the figure are:
-
- X - Stroke
- Y - Axial Thrust Load
-
- The Stroke is calculated using the equation:
-
- Stroke = AS * SF
-
- where:
- AS - Actual Stroke (entered in Parameters screen of the
- program)
- SF - Stroke Factor (based on cylinders Mounting Styles)
-
-
- Diagram shows how buckling effects are incorporated into main
- program. Painted domains are valid ones for corresponding piston
- diameters whose sizes are marked with the same colour and shown
- below diagram. Of course not all values of piston rod are shown on
- diagram, some of them are removed just for brevity and getting
- visual interpretation in more clear way.
-
- All data are extracted and combined from world's manufacturers of
- Hydraulic Cylinders (Parker, Rexroth, Vickers & others), as well as
- laboratory data obtained from University of Belgrade, Faculty of
- Mechanical Engineering, Laboratory for Material Resistance and
- Machine Materials during my work in Europe.
-
- Please return to Main menu (press ESC to get there) choose Item
- No.6 and picture will be shown on your screen.
-
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