Control method and device of proportional valve

Abstract

The invention discloses a control method and device of a proportional valve, and belongs to the field of hydraulic lifting. The method comprises the steps that handle command signals B are periodically obtained; whether the handle operation speed is too high or not is judged according to the current periodical handle command signals B1; when the handle operation speed is too high, the changing tendency of the intensity of the handle command signals B is judged, and the changing tendency includes an increase or a reduction; when the changing tendency of the intensity of the handle command signals B is the increase, the small signals are selected from the current periodical handle command signals B1 and control signals C to serve as output signals; when the changing tendency of the intensity of handle command signals B is the reduction, the large signals are selected from the current periodical handle command signals B1 and the control signals C to serve as output signals, wherein the absolute value of the deduction of B1 and C is larger than or equal to V, and V is larger than zero. The proportional valve is prevented from being opened and closed too fast, the impact of pipeline liquid to a hydraulic system is reduced, and the safety of a lifting platform is guaranteed.

Description

technical field [0001] The invention relates to the field of hydraulic lifting, in particular to a proportional valve control method and device. Background technique [0002] The hydraulic rack-and-pinion lifting system is a lifting system widely used on the offshore platform, which can be used to realize the lifting control and detection of the offshore platform. [0003] The hydraulic rack and pinion lifting system realizes the flow control of the hydraulic pipeline by controlling the opening and closing of the proportional valve. Due to the action of the flowing liquid and the inertia of the moving parts, if the proportional valve opens and closes too fast, the dynamic potential energy of the pipeline will change greatly, which will cause a greater impact on the hydraulic system. The appearance of hydraulic impact may cause a greater impact on the hydraulic system The damage of the hydraulic system will affect the normal operation of the hydraulic system, and more seriou...

AI Technical Summary

Problems solved by technology

Due to the effect of the flowing liquid and the inertia of moving parts, if the proportional valve is opened and closed too fast, the dynamic potential energy of the pipeline fluid will change greatly, causing a greater impact on the hydraulic system, and the occurrence of hydraulic shock may cause greater damage to the hydraulic system. damage to the hydraulic system and affect the normal operation of the hydraulic system, and more serious consequences may occur in high-pressure, high-speed and large-flow systems such as offshore platform lifting systems

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