Hydraulic synchronous driving system for adjusting unbalanced load based on proportional valve controlled energy accumulator

Abstract

The invention discloses a hydraulic synchronous driving system for adjusting unbalanced load based on a proportional valve controlled energy accumulator, comprising a hydraulic transmission loop and an electro hydraulic control system. The hydraulic synchronous driving system aims to realize synchronous movement with higher precision under the unbalanced load condition. The hydraulic transmission loop comprises an oil tank, oil absorption filters, overflowing valves, motors, shaft couplers, metering pumps, high-pressure filters, a speed adjusting valve, three-position four-way electro hydraulic reversing valves, hydraulic locks, balance valves, hydraulic cylinders, two-position four-way proportional reversing valves and energy storage devices. The electro hydraulic control system comprises a displacement synchronous control loop based on displacement feedback of the hydraulic cylinders and a load balancing adjusting and controlling circuit based on pressure feedback of rodless cavities of the hydraulic cylinders. Aiming at an unbalanced load working condition, the working pressure of the hydraulic cylinders is adjusted and controlled through the proportional valve controlled energy accumulator and the load balance between the different hydraulic cylinders is realized. Therefore, the bad influences on the synchronous precision by the unbalanced load are radically eliminated, the coordinated consideration of the displacement synchronization and the load balance is realized and higher synchronization precision is realized.

Description

technical field [0001] The invention relates to a fluid pressure actuator, in particular to a hydraulic synchronous drive system for adjusting eccentric load based on a proportional valve-controlled accumulator. Background technique [0002] The hydraulic synchronous drive system is mainly aimed at high-load and high-power applications, where two or more hydraulic cylinders or hydraulic motors drive a load at the same time. This kind of synchronous drive of multiple actuators generally has synchronization of motion displacement or speed due to factors such as different loads, frictional resistance, leakage, and differences in cylinder bore manufacturing dimensions of each actuator. Especially in the case of high-power hydraulic synchronous drive where the working environment is complex, the load is severe, that is, the load is unbalanced, such as the synchronous propulsion system of the shield boring machine, and some lifting and lifting mechanical equipment, the partial loa...

AI Technical Summary

Problems solved by technology

[0003] The existing hydraulic system closed-loop synchronous control technology often adopts the equivalent mode and the master-slave mode, but they cannot guarantee the load balance in the driving process, and cannot fundamentally solve the problem of synchronization accuracy under the condition of partial load

In the Chinese invention patent CN101749294A announced on June 23, 2010, a hydraulic synchronous drive control system for load balancing is disclosed. The system indirectly regulates the pressure difference between the inlet and outlet of the motor by adjusting the flow rate of the proportional directional valve to achieve load balancing. Speed ​​synchronization in the true strict sense cannot be achieved, and better coordination and consideration is needed between load balancing and speed synchronization drivers

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