A hydraulic system oil leakage monitoring method and device

Abstract

The application belongs to the technical field of test control, and particularly relates to a hydraulic system oil leakage monitoring method and device. The method comprises the following steps: S1, obtaining oil leakage signals fed back by multiple photoelectric oil leakage sensors installed at different valves of each oil pump; S2, for each oil pump, when only one photoelectric oil leakage sensor gives an oil leakage signal indicating oil leakage, issuing an audible and visual alarm; and S3, when two photoelectric oil leakage sensors give oil leakage signals indicating oil leakage, obtaining a monitoring picture collected by an installed camera, determining an oil pump from which oil is leaked according to the monitoring picture, and sending a pump stopping and pressure releasing instruction to the oil pump. The application improves the safety protection capability of the hydraulic system and provides a strong guarantee for safe operation of fatigue test.

Description

Technical Field

[0001] This application belongs to the field of testing and control technology, and specifically relates to a method and device for monitoring oil leakage in hydraulic systems. Background Technology

[0002] The power source is an essential piece of equipment for fatigue testing. The primary responsibility of the on-duty personnel is to check for oil leaks and sprays on site. However, manual inspection has many drawbacks. The real-time monitoring of oil leaks and sprays is insufficient, and accidents cannot be dealt with in a timely manner, which poses a hidden danger to the safe operation of the test. Summary of the Invention

[0003] To address the aforementioned issues, this application provides a method and apparatus for monitoring oil leakage in a hydraulic system, employing a combination of hardware and software testing and control devices to monitor oil leakage in the hydraulic system used in aircraft fatigue testing.

[0004] The first aspect of this application provides a method for detecting oil leakage in a hydraulic system, mainly including:

[0005] Step S1: Obtain the oil leakage signal fed back by multiple photoelectric oil leakage sensors installed at different valves of each oil pump;

[0006] Step S2: For each oil pump, when only one photoelectric leak sensor gives a leak signal indicating an oil leak, an audible and visual alarm is issued.

[0007] Step S3: When two photoelectric oil leak sensors give oil leak signals, the monitoring screen captured by the installed camera is obtained, the oil pump causing the oil leak is determined based on the monitoring screen, and a pump stop and depressurization command is sent to the oil pump.

[0008] Preferably, in step S1, the photoelectric oil leakage sensor is installed in the oil receiving box. The oil receiving box includes two boxes, each of which has a bottom edge, a front side edge, a left side edge, a right side edge, and a rear side edge. The front side edge has multiple semi-circular notches. The two boxes are joined together through the front side edge, forming multiple circular notches after joining. The multiple circular notches are located below the valves of the oil pump pipelines arranged side by side.

[0009] Preferably, a through hole is provided on the front side of the box body. After the front sides of the two boxes body are joined together, the through holes on the front sides are aligned so that the oil in one box body can flow into the other box body after reaching the height of the through hole. The photoelectric oil leakage sensor is installed in one of the boxes body.

[0010] Preferably, in step S3, the camera identifies the oil pump that is leaking or spraying oil by attaching the oil pump number to the pipeline with the valve.

[0011] Preferably, step S2 further includes explicitly identifying the valves, pipelines, and oil pumps corresponding to the oil leakage signal given by the photoelectric oil leakage sensor when the oil leakage is detected in the pre-built hydraulic system pipeline model.

[0012] The second aspect of this application provides a hydraulic system oil leakage monitoring device, mainly comprising:

[0013] The oil leakage signal acquisition module is used to acquire oil leakage signals from multiple photoelectric oil leakage sensors installed at different valves of each oil pump.

[0014] The audible and visual alarm module is used to issue an audible and visual alarm for each oil pump when only one photoelectric leak sensor provides a leak signal.

[0015] The oil leak analysis module is used to acquire monitoring images captured by the installed camera when two photoelectric oil leak sensors give oil leak signals, determine the oil pump leaking oil based on the monitoring images, and send a pump stop and depressurization command to the oil pump.

[0016] Preferably, the photoelectric oil leakage sensor is disposed in an oil receiving box, which includes two boxes, each box having a bottom edge, a front side edge, a left side edge, a right side edge, and a rear side edge. The front side edge has multiple semi-circular notches. The two boxes are joined together through the front side edge, forming multiple circular notches after joining. The multiple circular notches are respectively located below the valves of the oil pump pipelines arranged side by side.

[0017] Preferably, a through hole is provided on the front side of the box body. After the front sides of the two boxes body are joined together, the through holes on the front sides are aligned so that the oil in one box body can flow into the other box body after reaching the height of the through hole. The photoelectric oil leakage sensor is installed in one of the boxes body.

[0018] Preferably, in the oil leak analysis module, the camera identifies the oil pump that is leaking or spraying oil by attaching the oil pump number to the pipeline with the valve.

[0019] Preferably, the audible and visual alarm module includes an identification unit, which is used to explicitly identify the valve, pipeline and oil pump corresponding to the oil leakage signal given by the photoelectric oil leakage sensor when the oil leakage is detected in the pre-constructed hydraulic system pipeline model.

[0020] This application improves the safety protection capability of the hydraulic system and provides a strong guarantee for the safe operation of fatigue testing. Attached Figure Description

[0021] Figure 1 This is a flowchart of a preferred embodiment of the hydraulic system oil leakage monitoring method of this application.

[0022] Figure 2 This is a block diagram of the system components.

[0023] Figure 3 This is a top view of the box structure in the oil receiving box.

[0024] Figure 4 This is a schematic diagram of the parameters of the oil leakage photoelectric sensor. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0026] The first aspect of this application provides a method for detecting oil leakage in a hydraulic system, such as... Figure 1 As shown, it mainly includes:

[0027] Step S1: Obtain the oil leakage signal fed back by multiple photoelectric oil leakage sensors installed at different valves of each oil pump;

[0028] Step S2: For each oil pump, when only one photoelectric leak sensor gives a leak signal indicating an oil leak, an audible and visual alarm is issued.

[0029] Step S3: When two photoelectric oil leak sensors give oil leak signals, the monitoring screen captured by the installed camera is obtained, the oil pump causing the oil leak is determined based on the monitoring screen, and a pump stop and depressurization command is sent to the oil pump.

[0030] This application adopts a hardware-software hybrid design. The hardware consists of the actuators for data acquisition and control. The system block diagram is as follows: Figure 2As shown, the system adopts an Internet of Things (IoT) architecture. The application layer's host computer software is written in the visual language LabVIEW, enabling remote real-time monitoring of oil leaks and displaying the data intuitively on a computer interface, while also saving the status information in real time. The slave computer uses a programmable logic controller (PLC) as its control core, comprising an oil receiving box, oil leak sensors, a smart camera, and the PLC, forming the IoT's sensing layer to perform oil leak monitoring and oil pump control functions. The network layer uses fiber optic cables, Ethernet cables, and switches to form a local area network, handling the uploading and downloading of monitoring and control data.

[0031] In some optional embodiments, in step S1, the photoelectric oil leakage sensor is installed in the oil receiving box. The oil receiving box includes two boxes, each of which has a bottom edge, a front side edge, a left side edge, a right side edge, and a rear side edge. The front side edge has multiple semi-circular notches. The two boxes are joined together through the front side edge, forming multiple circular notches after joining. The multiple circular notches are located below the valves of the oil pump pipelines arranged side by side.

[0032] In some alternative embodiments, a through hole is provided on the front side of the box. After the front sides of the two boxes are joined together, the through holes on the front sides are aligned so that the oil in one box can flow into the other box after reaching the height of the through hole. The photoelectric oil leakage sensor is installed in one of the boxes.

[0033] To enable real-time monitoring of oil leakage and spraying from high- and low-pressure valves in hydraulic pipelines, this application designs a dedicated oil collection box, such as... Figure 3 As shown, two boxes are joined together. The boxes are used to collect leaking oil, and the circular notches are for accommodating pipelines, for example, four pipelines arranged side-by-side. Thus, each oil collection box can monitor four valves. The oil collection boxes are typically designed as two parts of different sizes, connected by screws, for easy assembly and disassembly, facilitating maintenance of the hydraulic lines. Each part of the box has two through holes at the connection point, connecting both sides, allowing oil to flow from one side to the other when it reaches a certain height. Therefore, only one photoelectric oil leak sensor needs to be placed inside one side of the oil collection box. The parameters of the photoelectric oil leak sensor are as follows... Figure 4 As shown, it outputs a digital switch signal, which is connected to a PLC to monitor the oil leak status in real time.

[0034] For easy disassembly and maintenance, the oil leak sensor is fixed to a custom-designed telescopic rod that can be freely extended and retracted. It can be quickly retracted and removed during disassembly without interfering with the maintenance of the hydraulic valves, thus improving work efficiency. The oil collection box in this application enables the monitoring of oil leaks and sprays from the valves, digitizing the accident status of oil leaks and sprays.

[0035] In step S2, when only one sensor alarms, only an audible and visual alarm is triggered, prompting the on-duty personnel to check for oil leaks on-site. In step S3, if two or more sensors alarm simultaneously, combined with the alarm signal from the intelligent video monitoring, it indicates that there is oil spraying. The host computer software automatically determines which oil pump is spraying oil and automatically sends a command to stop the pump and relieve pressure, preventing the accident from escalating and ensuring the safety of the hydraulic system.

[0036] The above process is implemented on a host computer through monitoring software. The host computer is located in the control center on the second floor of the laboratory and is connected to the monitoring PLC of the pump station via a switch, fiber optic cable, network cable, etc. It is written on the LabVIEW 2017 platform and provides a monitoring interface. The above intelligent control strategies are implemented for different oil leakage and spraying situations.

[0037] In some alternative implementations, in step S3, the camera identifies the oil pump that is leaking or spraying oil by attaching an oil pump number to the pipeline with the valve.

[0038] In this embodiment, to improve the accuracy of identifying hydraulic valve oil leakage and spraying, an intelligent camera is used. This camera has a built-in intelligent boundary detection function, which can intelligently identify the monitoring of a designated area. If oil leakage or spraying occurs, it can output an alarm signal and automatically save the recording. The alarm signal is a digital switch signal, which is connected to a PLC for centralized monitoring. To effectively identify which oil pump is alarming, a conspicuous oil pump number is affixed to the high-pressure output interface.

[0039] In some optional embodiments, step S2 further includes explicitly identifying the valves, pipelines, and oil pumps corresponding to the oil leakage signal given by the photoelectric oil leakage sensor when the oil leakage is detected in the pre-built hydraulic system pipeline model.

[0040] This application uses a touch screen connected to the oil pump monitoring PLC to monitor the oil leakage and injection status in real time. The monitoring status and corresponding location of the oil leakage sensor are clearly marked on the interface. In addition, in this embodiment, if an alarm occurs, it will be marked with a red indicator light, or the oil leakage valve, pipeline, etc. in the pre-built hydraulic system pipeline model will be highlighted or marked with a special color.

[0041] This application presents a hydraulic system oil leakage monitoring device designed using a combination of hardware and software technologies. It achieves intelligent identification, automatic alarm, and automatic pump shutdown functions, improving the safety performance of the hydraulic system and laying the foundation for digital management in laboratories. The device has a low investment cost and can be applied to similar scenarios.

[0042] The second aspect of this application provides a hydraulic system oil leakage monitoring device corresponding to the above method, mainly comprising:

[0043] The oil leakage signal acquisition module is used to acquire oil leakage signals from multiple photoelectric oil leakage sensors installed at different valves of each oil pump.

[0044] The audible and visual alarm module is used to issue an audible and visual alarm for each oil pump when only one photoelectric leak sensor provides a leak signal.

[0045] The oil leak analysis module is used to acquire monitoring images captured by the installed camera when two photoelectric oil leak sensors give oil leak signals, determine the oil pump leaking oil based on the monitoring images, and send a pump stop and depressurization command to the oil pump.

[0046] In some optional embodiments, the photoelectric oil leakage sensor is disposed in an oil receiving box, which includes two boxes, each box having a bottom edge, a front side edge, a left side edge, a right side edge, and a rear side edge. The front side edge has multiple semi-circular notches. The two boxes are joined together through the front side edge, forming multiple circular notches after joining. The multiple circular notches are respectively located below the valves of the oil pump pipelines arranged side by side.

[0047] In some alternative embodiments, a through hole is provided on the front side of the box. After the front sides of the two boxes are joined together, the through holes on the front sides are aligned so that the oil in one box can flow into the other box after reaching the height of the through hole. The photoelectric oil leakage sensor is installed in one of the boxes.

[0048] In some alternative implementations, in the oil leak analysis module, the camera identifies the oil pump that is leaking or spraying oil by attaching an oil pump number to a pipeline with a valve.

[0049] In some optional embodiments, the audible and visual alarm module includes an identification unit for explicitly identifying the valve, pipeline, and oil pump corresponding to the oil leakage signal given by the photoelectric oil leakage sensor when the oil leakage is detected in a pre-built hydraulic system pipeline model.

[0050] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for detecting oil leakage in a hydraulic system, characterized in that, include: Step S1: Obtain the oil leakage signal fed back by multiple photoelectric oil leakage sensors installed at different valves of each oil pump; Step S2: For each oil pump, when only one photoelectric leak sensor gives a leak signal indicating an oil leak, an audible and visual alarm is issued. Step S3: When two photoelectric oil leak sensors give oil leak signals, the monitoring screen captured by the installed camera is obtained, the oil pump that is leaking oil is determined according to the monitoring screen, and a pump stop and depressurization command is sent to the oil pump. In step S1, the photoelectric oil leakage sensor is installed in the oil receiving box. The oil receiving box includes two boxes, each of which has a bottom edge, a front side edge, a left side edge, a right side edge, and a rear side edge. The front side edge has multiple semi-circular notches. The two boxes are joined together through the front side edge, forming multiple circular notches after joining. The multiple circular notches are located below the valves of the oil pump pipelines arranged side by side. The front side of the box has a through hole. After the front sides of the two boxes are joined together, the through holes on the front sides are aligned so that the oil in one box can flow into the other box after reaching the height of the through hole. The photoelectric oil leakage sensor is installed in one of the boxes.

2. The hydraulic system oil leakage monitoring method as described in claim 1, characterized in that, In step S3, the camera identifies the oil pump that is leaking or spraying oil by attaching the oil pump number to the pipeline with the valve.

3. The hydraulic system oil leakage monitoring method as described in claim 1, characterized in that, Step S2 further includes explicitly identifying the valves, pipelines, and oil pumps corresponding to the oil leakage signal given by the photoelectric oil leakage sensor when the oil leakage signal is an oil leakage in the pre-constructed hydraulic system pipeline model.

4. A hydraulic system oil leakage monitoring device, characterized in that, include: The oil leakage signal acquisition module is used to acquire oil leakage signals from multiple photoelectric oil leakage sensors installed at different valves of each oil pump. The audible and visual alarm module is used to issue an audible and visual alarm for each oil pump when only one photoelectric leak sensor provides a leak signal. The oil leak analysis module is used to acquire the monitoring screen captured by the installed camera when there are two photoelectric oil leak sensors that give oil leak signals, determine the oil pump that is leaking oil based on the monitoring screen, and send a pump stop and depressurization command to the oil pump. The photoelectric oil leakage sensor is installed in the oil receiving box. The oil receiving box includes two boxes, each of which has a bottom edge, a front side edge, a left side edge, a right side edge, and a rear side edge. The front side edge has multiple semi-circular notches. The two boxes are joined together through the front side edge, forming multiple circular notches after joining. The multiple circular notches are located below the valves of the oil pump pipelines arranged side by side. A through hole is provided on the front side of the box. After the front sides of the two boxes are joined together, the through holes on the front sides are aligned so that the oil in one box can flow into the other box after reaching the height of the through hole. The photoelectric oil leakage sensor is installed in one of the boxes.

5. The hydraulic system oil leakage monitoring device as described in claim 4, characterized in that, In the oil leak analysis module, the camera identifies the oil pump that is leaking or spraying oil by attaching the oil pump number to the pipeline with the valve.

6. The hydraulic system oil leakage monitoring device as described in claim 4, characterized in that, The audible and visual alarm module includes an identification unit, which is used to explicitly identify the valves, pipelines and oil pumps corresponding to the oil leakage signal given by the photoelectric oil leakage sensor in the pre-constructed hydraulic system pipeline model.

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