Double hydraulic cylinder flow compensation synchronous erecting device and its control method

Abstract

The invention relates to a double hydraulic cylinder flow compensation synchronous erection device and a control method thereof. The double hydraulic cylinder flow compensation synchronous erection device is mainly composed of hydraulic cylinders, piston rods, an oil pump, servo valves, an oil tank, displacement sensors, controllers, an overflow valve, a computer and the like. The first displacement sensor and the second displacement sensor detect the displacement of the first piston rod and the second piston rod, a detection result is converted through an AD converter, data are transmitted tothe computer, the difference between the displacement of the first displacement sensor and the displacement of the second displacement sensor is calculated by the computer, and the result is sent tothe first controller and the second controller through a DA converter; according to the displacement difference of the first piston rod and the second piston rod, the size of valve elements of the first servo valve and the second servo valve is adjusted many times, so that the flow of the valve elements of the first servo valve and the second servo valve can be changed till the displacement difference of the first piston rod and the second piston rod is zero. The double hydraulic cylinder flow compensation synchronous erection device and the control method thereof solve the problems that a flow dividing synchronous device is poor in eccentric load resisting capacity, low in synchronizing precision and poor in reliability, improve the synchronizing precision and the responding speed, and improve safety and stability.

Description

[0001] Technical field [0002] The invention relates to a double hydraulic cylinder flow compensation synchronous erecting device and a control method thereof, belonging to the technical field of hydraulic control. Background technique [0003] The existing large-scale equipment erection control system has two principle modes: one is to use a single multi-stage oil cylinder for erection. This principle mode has a simple structure, but it is not suitable for the working condition of unbalanced load, and its reliability is poor; The other is to use two multi-stage cylinders for erection, together with a synchronous diverter valve. Although this principle mode realizes the simultaneous erection of two cylinders, its accuracy is low, only about 5%, and the stability is not high, so it is safe Sex is poor. Due to the obvious advantages of the valve-controlled cylinder system, such as good speed, quick response, and high control precision, dual cylinders are commonly used to drive...

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Problems solved by technology

[0005] In order to solve the above problems, the present invention proposes a double hydraulic cylinder flow compensation synchronous erecting device and its control method. This control method can realize the change of the flow in the hydraulic control system, and change according to the difference between the displacement of the first and second piston rods. The displacement of the spool of the servo valve controls the output flow of the hydraulic cylinder. After multiple adjustments until the difference between the displacement of the first and second piston rods is zero, this method improves the synchronization accuracy and improves the safety and reliability of the hydraulic system. and overcome the defects of slow response speed and low synchronization accuracy of the hydraulic synchronous deviation correction system

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