Synchronizing system for multiple hydraulic cylinders and control method for synchronizing system for multiple hydraulic cylinders

Abstract

The invention discloses a synchronizing system for multiple hydraulic cylinders and a control method for the synchronizing system for multiple hydraulic cylinders. The synchronizing system for multiple hydraulic cylinders, disclosed by the invention, includes two hydraulic control valves, three hydraulic cylinders and a rigid fixed connection mechanism, as well as a control unit and a feedback pressure sensor, wherein two of the hydraulic cylinders are reference hydraulic cylinders, and the other hydraulic cylinder is a servo hydraulic cylinder; the hydraulic control valve connected with the servo hydraulic cylinder is a servo hydraulic control valve; pressure of a reserved hydraulic chamber of the servo hydraulic cylinder is detected by a feedback pressure sensor; the control unit is in signal connection with an electric control end of the servo hydraulic control valve; the control unit can be used for confirming the servo pressure of the servo hydraulic cylinder as per a detection signal of the feedback pressure sensor, and reducing the opening degree of the servo hydraulic control valve connected with the servo hydraulic cylinder when the servo pressure of the servo hydraulic cylinder is larger than a first threshold value. The synchronizing system for multiple hydraulic cylinders can improve the synchronization precision of actions of multiple hydraulic cylinders while controlling the cost.

Description

technical field [0001] The invention relates to hydraulic control technology, in particular to a multi-hydraulic cylinder synchronous system, and also relates to a control method of the multi-hydraulic cylinder synchronous system. Background technique [0002] The multi-hydraulic cylinder synchronization system is widely used in the process of mold, mold manufacturing and product molding process. [0003] Please refer to figure 1 , which is a schematic diagram of the working principle of a multi-hydraulic cylinder synchronization system. The multi-hydraulic cylinder synchronous system includes a plurality of hydraulic cylinders 3 and a rigid solid connection mechanism 2; in addition, it also includes an appropriate hydraulic control valve to control the extension or retraction of the hydraulic cylinders 3. The fixed ends of multiple hydraulic cylinders 3 are respectively fixed on predetermined base components, and at the same time, the movable ends of multiple hydraulic cy...

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Problems solved by technology

[0004] Based on the fact that the hydraulic oil in the hydraulic system always flows to the hydraulic cylinder with a smaller load, it is impossible to guarantee the synchronization accuracy of multiple hydraulic cylinders 3 by using ordinary methods to control the multi-hydraulic cylinder synchronization system

At present, in order to make multiple hydraulic cylinders have high synchronization accuracy: one way is to force multiple hydraulic cylinders to act synchronously by increasing the rigidity of the rigid fixed mechanism 2; using this method is not only costly, but also the synchronization accuracy is very low. Difficult to meet actual needs

Another way is to supply the hydraulic oil to the control hydraulic cylinders separately through high-precision hydraulic control valves, and accurately control the movements of each hydraulic cylinder by controlling the flow of hydraulic oil to ensure the synchronization accuracy of the movements of multiple hydraulic cylinders; this method depends on Because the hydraulic control valve controls the accuracy of the hydraulic oil flow, either the control cost is too high, or the synchronization accuracy is difficult to meet the actual needs

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