Micro leakage flow automatic detection device and detection method thereof

Abstract

The invention provides a micro leakage flow automatic detection device which is used for detecting the leakage rate between a first cavity and a second cavity and comprises a liquid source, a fluid pipeline control device and a metering device. The output end of the liquid source is communicated with any one of the first cavity and the second cavity through a fluid pipeline, the other cavity is a testing cavity, the liquid source injects fluid into the cavity connected with the liquid source, the fluid leaks into the testing cavity from the inside, and during testing, the electromagnetic valve is closed so that the internal leakage fluid can only flow into the metering device. After the test is finished, the electromagnetic valve is opened to discharge the leakage fluid, and the metering device is emptied to facilitate the next detection; according to the invention, the automatic detection of the micro leakage flow can be realized without manual intervention, the detection efficiency and precision are greatly improved, and the testable object and working condition range is wider.

Description

technical field [0001] The invention relates to the field of fluid technology, and more specifically, to an automatic detection device and a detection method for micro-leakage flow. Background technique [0002] In the fluid field, there are many fluid power components, executive components, and fluid pressure, flow, and direction control components, all of which have problems of external leakage and internal leakage; especially internal leakage, due to the amount of leakage Small size, inconvenient leakage detection, no corresponding flow measurement device, often can only use measuring cups and other measuring containers; not only poor detection accuracy, low efficiency, but also labor-intensive; therefore, how to efficiently detect internal leakage has always been a problem An important direction for continuing research in this field. [0003] Among the detection methods in the prior art, a real-time monitoring device and method for the leakage of a hydraulic cylinder is...

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Problems solved by technology

[0002] In the fluid field, there are many fluid power components, executive components, and fluid pressure, flow, and direction control components, all of which have problems of external leakage and internal leakage; especially internal leakage, due to the amount of leakage Small size, inconvenient leakage detection, no corresponding flow measurement device, often can only use measuring cups and other measuring containers; not only poor detection accuracy, low efficiency, but also labor-intensive; therefore, how to efficiently detect internal leakage has always been a problem Important directions for continued research in this field

[0003] Among the detection methods in the prior art, a real-time monitoring device and method for the leakage of a hydraulic cylinder is announced. A cumulative high-pressure flowmeter is installed in the oil path from the reversing valve to the rodless chamber of the hydraulic cylinder; The linear displacement sensor used to detect the displacement of the piston rod of the hydraulic cylinder; the linear displacement sensor and the cumulative high-pressure flowmeter transmit signals to the PLC controller; the actual displacement value is compared with the theoretical displacement value through the PLC controller, and the difference is converted into internal leakage In this way, the leakage in the hydraulic cylinder is monitored in real time; on the one hand, there are multiple errors such as the error of the theoretical displacement value itself, the error of the actual displacement value itself, and the error accumulated during the use of the cylinder in the process of wear and tear on the measurement accuracy of the internal leakage. On the other hand, this method needs to be carried out under the condition that the piston rod of the hydraulic cylinder is fully extended by the fluid, which is only suitable for the monitoring of a very small number of components such as hydraulic cylinders, and cannot meet the needs of universality, and the value of promotion and application is low

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