Detection device and detection method for safety function of electro-hydraulic actuator

Abstract

The invention discloses a detecting device of safety functions of an electrohydraulic actuator of the field of industrial valve control. The detecting device of the safety functions of the electrohydraulic actuator comprises a controller and an electrical control circuit which is connected with the controller. The electrical control circuit is respectively connected with a pressure sensor, a magnetic valve, a handle detecting device and a displacement sensor. The electrical control circuit is further connected with a hydraulic oil-way through the above-mentioned components respectively, the hydraulic oil-way is respectively connected with an energy accumulator, a pressure gage, the pressure sensor, the magnetic valve, a one-way valve, a first hydraulic control valve, a second hydraulic control valve, a hand-operated valve, a hydraulic cylinder and an oil return device. Safety functions detection is added. On the premise that normal control actions of the electrohydraulic actuator are not influenced, the safety functions of the electrohydraulic actuator can be detected in the process of normal use of the electrohydraulic actuator. In addition, energy storage status of an energy storage element energy accumulator can be analyzed quantificationally, and alarm can be given when energy storage is not enough.

Description

technical field [0001] The invention relates to a detection device and a detection method for industrial valve control, in particular to a detection device and a detection method for the safety function of an electro-hydraulic actuator. Background technique [0002] The detection device of the electro-hydraulic actuator is generally used in the position control of industrial valves. In recent years, a large number of electro-hydraulic actuators have begun to participate 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 safety function of the electrohydraulic actuator is used to respond to an emergency shutdown (ESD) event and implement control act...

AI Technical Summary

Problems solved by technology

Some manufacturers have tested all the components of the safety function in their products, but due to the lack of information synthesis, the detection of the energy storage capacity of the accumulator is obtained through the observation of a flowmeter, which lacks the safety function of the electro-hydraulic actuator products. Quantitative evaluation, only human qualitative judgment

The disadvantage of traditional electro-hydraulic actuators is that the detection coverage is incomplete, and other components related to safety functions have not been tested, so the accuracy of the test results is not high

Although some improved technologies have a relatively complete detection range, they can only make qualitative judgments artificially. Especially for the detection of energy storage in accumulators, they can only detect whether there is energy storage, but cannot judge whether the stored high-pressure oil is enough. Still haven't fundamentally solved the problem of detection accuracy

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