Safety execution detection method based on electro-hydraulic execution mechanism

Abstract

The invention discloses a safety execution detection method based on an electro-hydraulic execution mechanism. The detection method includes the following steps that a test instruction is started on acontroller; after a manual valve is pulled to a test position completely, a handle detection device sends a detection start signal to the controller; the controller controls an electromagnetic valveto be powered off and collects signals of a pressure sensor at the same time; after time T, the controller controls the electromagnetic valve to be powered on; the controller obtains pressure drop data of the pressure sensor in the T time through calculation; the controller conducts data analysis, and the data analysis includes the following steps that when the pressure drop data is equal to zeroor close to zero, an ESD control loop composed of the controller, the electromagnetic valve, a first hydraulic control valve and a second hydraulic control valve is faulty; when the pressure drop datais greater than a set value, an energy accumulator is insufficiently pressurized, and ESD action requirements cannot be met; when the pressure drop data is smaller than the set value and also significantly greater than zero, the ESD control loop and the energy accumulator for energy storage meet the ESD action requirements.

Description

technical field [0001] The invention relates to the technical field of electro-hydraulic actuators, in particular to a method for detecting safe execution based on electro-hydraulic actuators. Background technique [0002] The electro-hydraulic actuators in the prior art are generally used in the position control of industrial valves, and some are also involved in the realization of safety functions of the device, such as emergency stop and interlock protection. However, since the safety function of the electro-hydraulic actuator can only be triggered when the device is in a dangerous state, its safety function is in a non-activated state most of the time, making it difficult to confirm whether its safety function is intact. [0003] The online detection of the safety function of the electro-hydraulic actuator can detect the failure of the safety function of the electro-hydraulic actuator early, and help the user to take maintenance or repair measures in advance and restore ...

AI Technical Summary

Problems solved by technology

The products of MEA company in the United States are relatively complete, and all the components of the safety function are tested in its products, but because there is no information synthesis, the detection of the energy storage capacity of the accumulator is obtained through the observation of a flowmeter, and there is a lack of control over the power supply. The quantitative evaluation of the safety function of the liquid actuator product can only be artificially judged qualitatively

Therefore, there is a problem in the prior art that the detection accuracy of the safety function of the electro-hydraulic actuator is poor