Synchronous control system for master and salve hydraulic cylinders with fixed potential difference and control method therefor

Abstract

The invention discloses a synchronous control system for master and salve hydraulic cylinders with fixed potential difference. The synchronous control system for the master and salve hydraulic cylinders with fixed potential difference comprises a device body, a master hydraulic cylinder, n slave hydraulic cylinders, n+1 proportion adjusting valves and n+1 hydraulically controlled check valves, wherein the synchronous control system for the master and salve hydraulic cylinders further comprises three control programs, respectively are a synchronous control program for the master hydraulic cylinder with fixed potential difference, a synchronous control program for the slave hydraulic cylinders with fixed potential difference and a maximum potential difference protection control program for the master and slave hydraulic cylinders with fixed potential difference; According to the hydraulic cylinder synchronous control scheme provided by the invention, the high-accuracy synchronous movement of the plurality of hydraulic cylinders is achieved in the case of keeping certain distances among the hydraulic cylinders, and extremely strong robustness is provided. Therefore, the service life of the hydraulic cylinder is greatly prolonged, and the fault of stopping production to replace the leaked hydraulic cylinder is avoided.

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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