| 摘要 |
The present invention relates to an upward bending machine having a synchronizing device of a hydraulic cylinder, which is to bend a board by lifting the board while maintaining the horizontality of a lower mold. The upward bending machine having a synchronizing device of a hydraulic cylinder comprises: a synchronizing cylinder which has operation lines for supplying hydraulic pressure to hydraulic cylinders, a cylinder body, multiple pistons, and a rod; a main supply line and a synchronized supply line which supply hydraulic pressure; a prefill valve which is formed in the synchronized supply line; a recovery line which is formed in the main supply line to recover the hydraulic pressure; a servo valve which is formed in the recovery line to control the opening degree of the recovery line; a pedal switch which is formed in the servo valve to open and close the servo valve; a position sensor which senses a lower mold lifted by the hydraulic cylinders; and a control part which controls the operation of the hydraulic cylinders for lifting the lower mold. |
