TEST STAND FOR HIGH-PRESSURE HYDRAULIC UNITS

The invention relates to a stand for dynamic multi-parameter multi-component hydraulic tests to be performed on high-pressure hydraulic units intended for actuation of power cylinders of a heavy industry technological device. According to the invention, the stand comprises a closed bed frame (A) in a detachable modular construction, which, in an upper cross-beam (1), embeds an upper large-stroke double-acting hydraulic power cylinder (2) provided with an in-built displacement transducer, the hydraulic supply of the cylinder (2) being achieved using a hydraulic control unit (B), while, on a lower cross-beam (3) there is, integrally mounted, a lower double-acting hydraulic power cylinder (4) provided with an in-built displacement transducer, the said lower cylinder (4) being actuated by a high-pressure hydraulic unit (C) to be tested, provided with a pressure transducer (5), the advance of the rod (a) of the upper cylinder (2) being controlled, in a first stage, up to the contact with a rod (b) of the lower cylinder (4), the zero moment of the testing process being set thereby, after which, in a second stage, the actuation of the lower hydraulic cylinder (4) is controlled by the supply from the high-pressure hydraulic unit (C) to be tested, the pressure, power and displacement parameters being acquired up to the end of the stroke of the lower hydraulic cylinder (4), the flow-rate delivered by the high-pressure hydraulic unit (C) being evaluated by the integration of the displacement rate of the upper cylinder (2) with the surface of a piston (c), known per se. Invenţia se referă la un stand pentru testarea dinamică, multiparametrică, hidraulică, multicomponentă, a unui grup hidraulic de înaltă presiune, destinat acţionării cilindrilor de forţă din componenţa unui dispozitiv tehnologic din industria grea. Standul conform invenţiei este alcătuit dintr-un batiu-cadru (A) închis, de construcţie modulată, demontabilă, care înglobează într-o traversă (1) superioară un cilindru (2) hidraulic, de sarcină, superior, cu dublă acţiune şi cursă mare de lucru, prevăzut cu un traductor de deplasare, încorporat, alimentarea hidraulică a cilindrului (2) fiind realizată de la un grup (B) hidraulic de comandă, pe o traversă (3) inferioară fiind montat, solidar, un cilindru (4) hidraulic, de sarcină, inferior, cu dublă acţiune, prevăzut cu un traductor de deplasare încorporat, cilindrul (4) inferior fiind acţionat de la un grup (C) hidraulic, de înaltă presiune, de testat, pre