Water pressure testing machine pressure balancing device and control method thereof

Abstract

The invention discloses a water pressure testing machine pressure balancing device comprising a pressurization system, a balancing system and a bus, wherein the pressurization system comprises a pressurizer, a PLC (Programmable Logic Controller), a pressurizer control valve and a pressurization cylinder; the balancing system comprises a pressurizer, a hydraulic shaft controller, an electrohydraulic control valve and a balancing cylinder. The pressurization system and the balancing system are respectively provided with a power source and an actuator and form two independent and organically-combined closed-loop control systems. Moreover, the invention also discloses a control method for the water pressure testing machine pressure balancing device, which carries out closed-loop control on the water pressure testing machine pressure balancing device through a water filling step, a pressurization step, a pressure relief step and the like. The device and the method improve the stability of the pressure balance of the device, which facilitates fault maintenance and ensures the long-term stable running of equipment.

Description

technical field [0001] The invention relates to a hydraulic testing machine, in particular to a hydraulic testing machine controlled by an independent double closed-loop control device. Background technique [0002] The hydraulic testing machine is to fill the pipe with water and pressurize both ends to a certain pressure, so as to verify whether the pipe meets the API pressure resistance standard. In 1994, Baosteel introduced a complete set of advanced German steel pipe hydraulic testing machine, which is the most advanced among similar equipment at home and abroad. The basic principle of the hydraulic testing machine is as follows: [0003] In the steel pipe pressure test process, the test pressure is raised according to the set process, and the pressure p of the balance cylinder (support cylinder) is theoretically required 1 Follow the test pressure (boost cylinder) p in real time according to a certain ratio 3 , figure 1 expresses this balance. Depend on figure 1 A...

AI Technical Summary

Problems solved by technology

However, because the pressure balance control model of the hydraulic testing machine is a patented technology of the German REXROTH company, its information content and development environment are unknown to the Chinese side, and the field technicians cannot understand the internal design ideas of the system and the working principle of the hydraulic testing machine control I only know superficially, and I have been at a loss in the analysis of various faults, and it is quite difficult to judge and troubleshoot

Although we have gained a certain understanding of the hydraulic testing machine system through careful and step-by-step exploratory research in practice for many years, we still don't know much about it. As a result, every time a failure occurs, the cause of the failure cannot be found, or it takes a long time to find the reason

In addition, once the existing hydraulic testing machine has a problem with the entire closed-loop control system or a certain part of the actuator, it will cause pressure imbalance and the system will not be able to operate normally.

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