Hydraulic system of telescopic boom, telescopic boom and engineering vehicle

• Main Authors: GUO FANGYUN, QING LICHUN, LI HONGSHU, CHEN GUOPING
• Format: Patent
• Language: Chinese; English
• Published: 30.10.2020
• Subjects: BLASTING; CRANES; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; HAULING; HEATING; HOISTING; HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDEDFOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCEDIRECTLY TO THE SURFACE OF A LOAD; HYDRAULICS OR PNEUMATICS IN GENERAL; LIFTING; LIGHTING; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS,WINCHES, OR TACKLES; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; TRANSPORTING; WEAPONS

The invention discloses a hydraulic system of a telescopic boom, the telescopic boom and an engineering vehicle. The hydraulic system comprises a first oil way, multi-stage telescopic cylinders, a second oil way, a balance valve, a second one-way valve, a throttling valve, a third oil way and a control oil way; rodless cavities of the telescopic cylinders are communicated with the first oil way, and synchronous oil inlet or oil return is conducted on the rodless cavities of the telescopic cylinders through the first oil way; rod cavities of the telescopic cylinders communicate with the secondoil way, and synchronous oil inlet or oil return is conducted on the rod cavities of the telescopic cylinders through the second oil way; the balance valve is arranged on the first oil way, and the control oil way communicates with the control end of the balance valve and the second oil way; and the third oil way is connected between the first oil way and the second oil way, the second one-way valve and the throttling val