SERVOHYDRAULIC TESTING MACHINE FOR EVALUATION OF OPERATING CHARACTERISTICS OF ANTISEISMIC HYDRAULIC SHOCK ABSORBERS OF ATOMIC REACTORS Russian patent published in 2021 - IPC G01N3/32 

FIELD: testing.

SUBSTANCE: invention relates to tools (testing machines) and methods for studying operational characteristics of antiseismic hydraulic shock absorbers of nuclear power plants and can also be used for mechanical testing of material samples for tension, compression, and low- and high-cycle fatigue with zero crossing. The machine is comprised of a loading apparatus containing a base and a fixed traverse rigidly interconnected by columns, a crossbar rigidly connected with the fixed traverse by columns, a hydraulic cylinder for the ultimate load, installed in the base and rigidly attached thereto, a movable traverse coupled with the columns through antifrictional sleeves and rigidly attached to the plunger of the hydraulic cylinder for the ultimate load, one of two grips for fixing the studied hydraulic shock absorbers, coupled with the movable traverse through a force sensor, a small force hydraulic cylinder installed in the crossbar and rigidly attached thereto and by the plunger of said cylinder through the small force sensor connected with a rod installed in the fixed traverse on a hydrostatic bearing with the second grip, movement sensors. The machine also comprises a pumping unit, a system for control, measurement and processing of the research results. The areas of working cavities of the hydraulic cylinder for the ultimate load differ by a factor of two: the cavity with a larger area is controlled, and in the cavity with a smaller area constant pressure is maintained by means of a pumping unit. A threaded rod is introduced into the structure of the machine, placed inside the plunger of the hydraulic cylinder for the ultimate load with a free fit, rigidly attached at one end to the movable traverse and fastened and unfastened by means of two nuts with the plunger configured to be displaced longitudinally relative to the threaded rod.

EFFECT: provided is possibility of determining the perception of dynamic load by hydraulic shock absorbers with a high frequency of cyclic loading at optimal flow rate of the pumping unit.

2 cl, 1 dwg