| 摘要 |
FIELD: machine engineering, namely tube bending equipment. ^ SUBSTANCE: hydraulic circuit includes hydraulic cylinder whose piston rod is joined with slider holding movable roller performing main motion in direction to predetermined position in each of several passes of working part subjected to bending and reverse motion in direction to initial position. Hydraulic cylinder includes high-pressure chamber and low-pressure chamber; both chambers are communicated with respective ducts for pressurized liquid fed from reservoir by means of pump; passages with three-position four-way valve and check valve. Throttling valve is arranged between said two valves; it is operated by means of electromagnet for creating elevated pressure in low-pressure chamber of hydraulic cylinder, for decelerating slider holding upper roller during its main motion and for achieving programmed interval relative to predetermined position for each working pass. ^ EFFECT: simplified design, enhanced accuracy of bending tubes. ^ 6 dwg |
