The hydraulic connection of the piston rod and the piston and the electric heating connection

The hydraulic connection of the piston rod and the piston and the electric heating connection

Hydraulic connection: pressure hydraulic connection is the introduction of foreign advanced technology, the traditional nut fastening is using a wrench to tighten enforcement, pretightening force is added in the 23 before the thread, resulting in threaded parts of the abnormal stress, reduce the reliability of the connecting parts of the, and hydraulic connection is through the injection of highpressure oil (1500 bar) to the pressure in the annular inner cavity of the piston, forcing the piston rod (or the connecting rod bolts) joints in the elastic range compression elongation, small torque so that the nut tightly against the, and then discharged highpressure oil, to avoid in the fastening nut of thread harm, the threaded part of the stress is uniform.

piston rod

Electric heating: the piston rod and the piston of the electric heating connection is also the absorption of foreign advanced technology, it is using the principle of thermal expansion and contraction, in the deep hole in the end of the piston rod into an electric heating rod, after ohmic heating, so that the piston rod in the elastic range thermal elongation, and then use a small torque so that the piston nut rotates to a set angle (the angle after the procedure accurate calculation), to be cooled to room temperature after pre tightening force can be uniformly over the thread on the mating surfaces.

piston rod