fixing elements for tractor springs

[giotama]

having to use a tensile spring inside an oleodynamic actuator to lock it, they are looking for the various systems available for fixing the pull springs. are to be excluded a priori the work of end of the wire type hooks or rings and I would need to be able to adjust the preload of the spring itself. I have seen some elements that go into the spring's inner spiral that could already represent a good solution but I was wondering if there was anything else...
Does anyone have experiences in this kind of problem?

greetings
giotama

 

[Focus]

Do you need to insert a traction spring inside a hydraulic cylinder?

 

[giotama]

Yes!
is a plunger with stem made of tube. the spring is housed inside the stem and therefore must be a tensile spring

 

[cacciatorino]

Yes!
is a plunger with stem made of tube. the spring is housed inside the stem and therefore must be a tensile spring

Pay attention to the relationship between free length of the spring and its excursion. springs are sensitive to this aspect and from your mounting I think you will have a ratio close to 1:1 which is not optimal. generally as a rule better to have a ratio of 3 to 1 between free length and excursion.
Can't you put the springs out? at least in case of failure the changes without madness.

 

[giotama]

Unfortunately I am bound to this architecture, but by a small research on similar products it seems to me that it is quite consolidated practice.