Abstract: Hydraulic damper is a kind of hydraulic equipment, a response to speed sensitive vibration damping device. The working process of the hydraulic damper “gentleness” can be used to describe.
When the movement caused by the force exceeds the allowable speed, hydraulic damper will lock and load and the speed limit in a place called atresia after speed or speed value of the leakage rate. Therefore, test of hydraulic damper, the parameters of interest is as follows: for under the rated load, atresia after locking speed or leakage rate, the equivalent spring stiffness.
Under normal working condition of the piston rod speed V is less than the closure speed V, force on the pipeline is small, f low less than or equal to 1 ~ 2% FN; The instant impact load at the time, the increase of V to V closed when the hydraulic oil push valve core, to close the valve core to overcome the spring force, hydraulic oil flow only from the damping hole, the formation of FN damping force, make the damper atresia, So as to realize the purpose of reducing vibration, resistance to vibration.
For safety valve exhaust steam type damper, due to no damping valve core hole, can’t flow for the hydraulic medium, therefore, after locking speed V is equal to zero after closed, so as to realize the continuous of damper on the pulling force.
The working process of the hydraulic damper “gentleness” can be used to describe, in a pipe or equipment normal thermal expansion can then move slowly, and now its almost no damping force, the expression is “soft”; When the load transient hydraulic damper valve is activated, when its produce and vibration to the same size, curb the large vibration of the pipeline or equipment to reduce the amplitude, multiaxial servo tapping machine gear type tapping machine drilling power head so as to protect the piping or equipment, characterized by “just” at this time.
TAGS:
Hydraulic damper, Sensitivity device, Hydraulic damper working process, Damper