Hydraulic slide valve internal leakage acoustic emission detection experiment device and using method thereof

Abstract

The invention belongs to the technical field of hydraulic system detection or teaching facilities, and particularly relates to a hydraulic slide valve internal leakage acoustic emission detection experiment device and a using method thereof. The experiment device comprises a constant-pressure oil supply system, a leakage simulation device, an air-coupling acoustic emission sensor and a contact-type acoustic emission sensor; the constant-pressure oil supply system comprises a first oil tank, a hydraulic pump, a one-way valve, an energy accumulator and a ball valve which are sequentially connected through a pipeline; the experiment device further comprises a back pressure loading valve and an electromagnetic reversing valve with an inlet being connected to the back pressure loading valve; the leakage simulation device is connected through a pipeline and arranged between the ball valve and the back pressure loading valve; and the leakage simulation device comprises a plurality of valve elements, a plurality of valve bodies combined with the valve elements, a reset spring and a spiral micrometer head. The invention further provides the using method of the hydraulic slide valve internalleakage acoustic emission detection experiment device. Based on the device and the method, an analysis and verification experiment of internal leakage amount and leakage acoustic emission signal influence factors and a teaching experiment of leakage amount acoustic emission detection can be conveniently carried out.

Description

technical field [0001] The invention belongs to the technical field of hydraulic system detection or teaching facilities, and in particular relates to an acoustic emission detection experimental device for internal leakage of a hydraulic sliding valve and a method for using the same. Background technique [0002] The hydraulic slide valve has various functions and many advantages. It is often widely used in the hydraulic system as the core control element to control the flow direction, size and pressure of the oil. In order to ensure sealing and smooth sliding, the normal radial clearance between the spool valve core and the valve sleeve is 3-8 μm. Due to the existence of the gap, the internal leakage of the slide valve is inevitable, but the internal leakage under the normal gap is very small, which does not affect the normal operation of the system. However, the hydraulic spool valve has a high utilization rate, frequent opening, and long-term work in a high oil pressure ...

AI Technical Summary

Problems solved by technology

At present, acoustic emission technology is widely used in gas leakage detection, but it involves the complexity of the internal liquid flow state and the signal attenuation of solid-liquid coupling. It is rare to see this technology applied to the leakage detection of hydraulic slide valves. Stay more in theoretical research

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