RO95232B1

RO95232B1 - Hydrostatic installation for achieving the simultaneous motion of hydraulic motors

Info

Publication number: RO95232B1
Application number: RO122925A
Authority: RO
Inventors: Constantin Cretu
Original assignee: îNTREPRINDEREA MECANICA
Priority date: 1986-04-08
Filing date: 1986-04-08
Publication date: 1988-08-31

Abstract

Inventia se refera la o instalatie hidrostatica pentru realizarea simultaneitatii miscarii a cel putin doua motoare hidraulice liniare, cu sectiuni active egale, cu aceeasi încarcare, sau cu încarcare diferita, alimentate de la o sursa de presiune unica. Motoarele hidraulice sînt legate în serie, avînd alternativ rolul de conducator si condus, functie de sensul comun de miscare, iesirea hidromotorului conducator fiind legata cu intrarea hidromotorului condus. Schimbarea sensului de miscare se face prin comutarea pozitiilor unui distribuitor cu comanda electrica retinuta, iar reglarea vitezelor urcare si coborîre se face de la doua rezistente cu supape de ocolire. Presiunea din instalatie se regleaza de la o supapa de limitare a presiunii. Camerele comune ale celor doi cilindri sînt alimentate din acelasi circuit, printr-o supapa de sens, dar la o presiune reglata cu o supapa de reducere mai mica decît presiunea de lucru. în timpul urcarii sau coborîrii cilindrilor, supapa de sens ramîne închisa, deschizîndu-se numai atunci cînd cilindri s- au oprit la capat de cursa, actionînd numai cilindrul condus, care tinde sa ramîna în urma, anulînd astfel abaterea înregistrata la fiecare cursa, cilindrul conducator fiind neafectat, deoarece camera destinata ramîne sub actiunea presiunii reglata de la supapa de limitare mai mare ca valoare decît presiunea reglata de la supapa de reducere. The invention relates to a hydrostatic installation for achieving simultaneous movement of at least two linear hydraulic motors with equal active sections, with the same load, or with different load, fed from a single pressure source. The hydraulic motors are connected in series, alternating between the driver and the driver, depending on the common sense of movement, the exit of the leading hydro-motor being connected to the entry of the driven hydro-motor. Changing the direction of movement is done by switching the positions of a distributor with the electric control command, and adjusting the up and down speeds is made from two resistors with bypass valves. The pressure in the plant is regulated by a pressure limiting valve. The common chambers of the two cylinders are fed from the same circuit through a sensing valve, but at a regulated pressure with a reduction valve less than the working pressure. During the climbing or lowering of the cylinders, the valve remains closed, opening only when the cylinders have stopped at the end of the race, acting only the driven cylinder, which tends to remain behind, thus canceling the deviation recorded at each stroke, the cylinder the driver being unaffected since the intended chamber remains under the action of the pressure regulated from the limiting valve higher than the set pressure from the reduction valve.