Load-sensitive double-hydraulic-cylinder synchronous system and control method thereof

Abstract

The invention belongs to the technical field of hydraulic engineering, and particularly relates to a load-sensitive double-hydraulic-cylinder synchronous system and a control method thereof. The synchronous system mainly involves two synchronous drive hydraulic cylinders, a synchronous controller unit and a load sensitive unit, wherein a force instruction of the driven hydraulic cylinder is takenfrom a feedback signal of a force sensor arranged between a driving hydraulic cylinder and the load, and the output force of the driven hydraulic cylinder is adjusted in real time to ensure that the output force of the driven hydraulic cylinder is the same as the output force of the driving hydraulic cylinder so that synchronous driving of the ''driving'' hydraulic cylinder and the ''driven" hydraulic cylinder can be realized; the load sensitive unit ensures that the power supply of the system is matched with the large power demand in the "driving" hydraulic cylinder and the "driven" hydrauliccylinder; and when the "driving" hydraulic cylinder and the "driven" hydraulic cylinder are in an asynchronous working condition, the valve opening pressure difference of a servo valve on the hydraulic cylinder with large power is reduced, the valve opening pressure difference of a servo valve on the hydraulic cylinder with small power is increased, and at the moment, flow output by a pump flowsto the hydraulic cylinder with the small power more. The load-sensitive double-hydraulic-cylinder synchronous system has the advantages that the synchronization speed is fast, the synchronization precision is high, the reliability is high, the energy is saved, and the like.

Description

technical field [0001] The invention belongs to the technical field of hydraulic engineering, and in particular relates to a load-sensitive dual hydraulic cylinder synchronization system and a control method thereof. Background technique [0002] With the development of modern mechanical processing industry and aerospace technology, more and more metallurgical equipment, engineering machinery and aerospace equipment drive devices have more urgent requirements for high-precision synchronous drive technology. Among them, the hydraulic synchronous drive system is due to the structure The advantages of simple composition, suitable for high-power occasions and easy control occupy a very important position. At present, the synchronous drive strategies adopted by the hydraulic synchronous drive system include "equal" mode and "master-slave" mode. The "equal" method means that multiple hydraulic cylinders that need to work synchronously track the set ideal output at the same time, ...

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Problems solved by technology

At present, in the hydraulic system with two or more actuators, the realization of the load sensing unit is generally to compare the maximum load pressure signal of the actuator through the shuttle valve, and automatically send the larger load pressure signal through the feedback The oil circuit is transmitted to the load-sensing chamber of the load-sensing pump, and then controls the displacement of the variable pump, so that the hydraulic pump only provides the power required by the actuator to reduce the energy loss of the system, and more flow compensation valves are used in the circuit to control The pressure difference before and after the valve remains unchanged; but due to the loss of the pipeline and the flow compensation valve, the delay of the load feedback signal is relatively large. In addition, because the displacement of the variable pump in construction machinery is usually large, its response speed Slower, so the response lag of the existing load sensitive system is more serious

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