home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Education
/
collectionofeducationcarat1997.iso
/
SCIENCE
/
HC124D_2.ZIP
/
DIAGRAM.TXT
< prev
next >
Wrap
Text File
|
1994-12-29
|
3KB
|
60 lines
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.
----- end of file -----