PLUNGER-TYPE HYDRAULIC JACK WITH REPLACEABLE INSERTS AND UNLOADING UNITS AT MAXIMUM SEPARATION AND FOLDING-UP

摘要

mechanical engineering; powered supports of extraction complexes. SUBSTANCE: jack includes body, plunger, extension cylinder, rod and valve unit; jack is also provided with unloading devices at maximum separation and folding-up performed by means of pusher opening the relief valve which is connected with check valve; body of hydraulic jack is provided with replaceable inserts. EFFECT: enhanced durability and reliability of jack; enhanced wear resistance of hydraulic cylinder and plunger surfaces. 3 dwg