Hydraulic cylinder as well as method and system for controlling same

Abstract

The invention relates to a hydraulic cylinder which comprises a cylinder barrel and a guide seal sleeve, wherein the guide seal sleeve is fixed on the cylinder barrel; the cylinder barrel and the guide seal sleeve form a containing cavity; a big movable piston is arranged in the containing cavity; the containing cavity is divided into a rod cavity and a rod-free cavity by the big piston; a plungercavity is arranged on the big piston; one end of a small piston is tightly matched in the plunger cavity, the other end is fixed on the cylinder barrel, and the big piston can move relative to the small piston; and the plunger cavity is connected with a hydraulic system by a through hole arranged in the small piston. The invention also relates to a method and a system for controlling the hydraulic cylinder. The hydraulic cylinder with favorable applicability can output smaller or larger thrust under the condition of being communicated with pressure oil with higher pressure.

Description

technical field [0001] The invention relates to the field of hydraulic cylinders, in particular to a hydraulic cylinder applied to continuous casting machines in iron and steel smelting, and a control method and control system for the hydraulic cylinder. Background technique [0002] At present, the commonly used hydraulic cylinder is a two-chamber hydraulic cylinder. The two chambers of the hydraulic cylinder are respectively connected to the hydraulic system. With the help of high-pressure oil provided by the hydraulic system, the piston disposed between the two chambers can obtain a corresponding force. see figure 1 and figure 2 , respectively show the existing two-chamber hydraulic cylinder and the control system of the two-chamber hydraulic cylinder. See figure 1 The hydraulic cylinder includes a cylinder barrel 14 and a guide seal sleeve 12 fixed on the cylinder barrel 14. The cylinder barrel 14 and the guide seal sleeve 12 form a closed cavity, and a large piston ...

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Problems solved by technology

[0009] see image 3 , shows the working curve of the pressure reducing valve of the hydraulic system. It can be seen from the curve that when the pressure P of the pressure oil provided by the hydraulic system 20 is high, the pressure P is proportional to the opening K of the pressure valve, which is beneficial to control and provides pressure oil. The pressure P is stable; when the pressure P of the pressure oil provided by the hydraulic system 20 is very low, the pressure P is not proportional to the opening of the pressure valve, and it is difficult to control, so the pressure P of the pressure oil provided is also unstable, which will inevitably lead to a large piston. 11 The obtained thrust F2 is unstable, which affects the product quality

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