Regarding the locking process of toothed clamp
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This post was last edited by lishunnian on 2021-7-9 at 14:39. Recently, a client required a toothed clamping band for use with individual ports; the switch utilizes a hydraulic cylinder, with the teeth having an inclination of about 4%, which is roughly 2 degrees, and O-rings are used for sealing. When choosing the model of hydraulic cylinder, I suddenly thought of a question: to what extent does the hydraulic cylinder push the clamp to tighten it? Using an O-ring as a self-tightening washer, the preload should be 0. So, between the teeth of the clamp, does it just need to be pushed to the locked position? So the locking force only needs to be a few hundred newtons, right? After all, if too much preload is generated by pushing against the sealing surface, it will cause the clamping teeth to be subjected to pressure prematurely. When using the formula for calculation, the O-ring is subject only to axial force. Is this approach correct?
In principle, it is sufficient for the sealing surfaces to be in contact; the thrust of the hydraulic cylinder is only needed to overcome the friction resulting from the rotation of the gear ring, and the elasticity of the O-ring can be ignored.