A Master-Slave Hydraulic Cylinder Synchronous Control System and Control Method with Fixed Potential Difference

Abstract

The invention discloses a master-slave hydraulic cylinder synchronous control system with a fixed potential difference, comprising a device body, 1 active hydraulic cylinder, n slave hydraulic cylinders, n+1 proportional regulating valves and n+1 hydraulic control valves The one-way valve, the master-slave hydraulic cylinder synchronous control system also includes three control programs, which are the active hydraulic cylinder synchronous control program with fixed head, the slave hydraulic cylinder synchronous control program with fixed head and the Poor master-slave hydraulic cylinder maximum single-acting differential protection control program; the hydraulic cylinder synchronous control scheme of the present invention can not only enable multiple hydraulic cylinders to achieve high-precision synchronous movement while maintaining a certain distance from each other, but also has a large Strong robustness. This not only prolongs the service life of the hydraulic cylinder greatly, but also avoids the failure of stopping production to replace the internal leakage hydraulic cylinder.

Description

technical field [0001] The invention belongs to the technical field of hydraulic transmission control manufacturing, and in particular relates to a master-slave hydraulic cylinder synchronous control system and a control method thereof with a fixed potential difference. Background technique [0002] At present, hydraulic transmission control systems and their control methods are often used in industrial production. Sometimes it is necessary to use two or more hydraulic cylinders to synchronously drive a piece of equipment or multiple independent equipment operation. For example, in a large H-shaped steel production line, the side guide plates on both sides of the rolling stock between the racks of the universal roughing unit are synchronously driven by four hydraulic cylinders, and the synchronous control mode of the hydraulic cylinders belongs to the electronic control mode. This control mode requires each hydraulic cylinder All have position sensors (such as magnetostrict...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the control accuracy of the existing master-slave hydraulic cylinder hydraulic synchronous control system has high requirements on the hardware integrity of the hydraulic system and the external environment. There is a certain amount of internal leakage in each hydraulic cylinder, etc.), or when the sliding resistance becomes larger due to the accumulation of oxide scales on the side of the middle side guide plate due to the accumulation of scale on the sliding guide groove surface, the original hydraulic synchronization control program will not be able to guarantee the dynamic synchronization accuracy of the hydraulic cylinders. , and when there is a large deviation in the dynamic synchronization between the hydraulic cylinders, the middle side guide plate will be seriously skewed. At this time, the middle side guide plate frame will seriously interfere with the edge of the sliding guide groove, which will cause the middle side guide plate to be stuck The hydraulic cylinder cannot move, so the original hydraulic synchronous control program can not only guarantee the dynamic synchronous accuracy of the hydraulic cylinder, but also cannot guarantee the static positioning accuracy of the hydraulic cylinder, that is, the robustness of the original hydraulic synchronous control system is low; when the middle side guide plate is rolled In this case, in order to maintain production, it is hoped that the synchronously driven hydraulic cylinders of the middle side guide plate can move synchronously in the case of mutual misalignment, so that the two ends of the deformed middle side guide plate still remain The guides at the entrance of the rolling mill can be close to the two ends of the rolling mill to support the biting of the rolled piece. However, the existing synchronous control program of the master-slave hydraulic cylinder of the middle side guide plate does not have this adjustment function. To overcome the existing problems, a synchronous control system and control scheme for master-slave hydraulic cylinders with fixed head-difference are provided

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