Hydraulic system oil leakage monitoring method and device

Abstract

The invention belongs to the technical field of test measurement and control, and particularly relates to a hydraulic system oil leakage monitoring method and device. The method comprises the following steps: S1, acquiring oil leakage signals fed back by a plurality of photoelectric oil leakage sensors mounted at different valves of each oil pump; s2, for each oil pump, when an oil leakage signal sent by only one photoelectric oil leakage sensor is oil leakage, sending out a sound-light alarm; and S3, when the oil leakage signals sent by the two photoelectric oil leakage sensors are oil leakage, a monitoring picture collected by the installed camera is obtained, the oil pump which leaks oil and sprays oil is determined according to the monitoring picture, and a pump stopping and pressure relief instruction is sent to the oil pump. The safety protection capability of the hydraulic system is improved, and a powerful guarantee is provided for safe operation of a fatigue test.

Description

Technical Field

[0001] The present application belongs to the field of test and control technology, and in particular relates to a method and device for monitoring oil leakage in a hydraulic system. Background Art

[0002] The power source is a necessary equipment for fatigue test operation, and the inspection of oil leakage and oil injection on site is the most important responsibility of the on-duty personnel. However, there are many disadvantages in manual inspection, the real-time monitoring of oil leakage and oil injection is not strong enough, and accidents cannot be handled in time, which brings hidden dangers to the safe operation of the test. Summary of the invention

[0003] In order to solve the above problems, the present application provides a method and device for monitoring oil leakage in a hydraulic system, which uses a measurement and control test device combining software and hardware to monitor oil leakage in a hydraulic system of an aircraft fatigue test.

[0004] The first aspect of the present application provides a method for monitoring oil leakage in a hydraulic system, mainly comprising:

[0005] Step S1, obtaining oil leakage signals fed back by a plurality of photoelectric oil leakage sensors installed at different valves of each oil pump;

[0006] Step S2: for each oil pump, when only one photoelectric oil leakage sensor gives an oil leakage signal, an audible and visual alarm is issued;

[0007] Step S3: when there are two photoelectric oil leakage sensors giving oil leakage signals, obtain the monitoring picture collected by the installed camera, determine the oil pump that leaks oil based on the monitoring picture, and send a pump stop and pressure relief instruction to the oil pump.

[0008] Preferably, in step S1, the photoelectric oil leakage sensor is arranged in an oil receiving box, and the oil receiving box includes two box bodies, each box body has a bottom edge and a front side edge, a left side edge, a right side edge and a rear side edge, the front side edge has a plurality of semicircular notches, and the two box bodies are butt-jointed through the front side edges to form a plurality of circular notches, and the plurality of circular notches are respectively 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 box bodies are butted, the through holes on the front sides are aligned so that the oil in any box body can flow into the other box body after reaching the height of the through hole, and the photoelectric oil leakage sensor is arranged in one of the box bodies.

[0010] Preferably, in step S3, the oil pump number is pasted on a pipeline with a valve so that the camera can identify the oil pump that leaks or sprays oil.

[0011] Preferably, step S2 further comprises, in the pre-constructed hydraulic system pipeline model, explicitly marking 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.

[0012] The second aspect of the present application provides a hydraulic system oil leakage monitoring device, which mainly includes:

[0013] An oil leakage signal acquisition module is used to obtain oil leakage signals fed back by multiple photoelectric oil leakage sensors installed at different valves of each oil pump;

[0014] The sound and light alarm module is used to send out a sound and light alarm for each oil pump when only one photoelectric oil leakage sensor gives an oil leakage signal;

[0015] The oil leakage analysis module is used to obtain the monitoring picture collected by the installed camera when there are two photoelectric oil leakage sensors giving oil leakage signals, determine the oil pump that leaks oil based on the monitoring picture, and send a pump stop and pressure relief instruction to the oil pump.

[0016] Preferably, the photoelectric oil leakage sensor is arranged in an oil collecting box, and the oil collecting box includes two box bodies, each box body has a bottom edge and a front side edge, a left side edge, a right side edge and a rear side edge, the front side edge has a plurality of semicircular notches, and the two box bodies are butt-jointed through the front side edges to form a plurality of circular notches, and the plurality of 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 box bodies are butted, the through holes on the front sides are aligned so that the oil in any box body can flow into the other box body after reaching the height of the through hole, and the photoelectric oil leakage sensor is arranged in one of the box bodies.

[0018] Preferably, in the oil leakage analysis module, the camera can identify the oil pump that leaks and sprays oil by pasting the oil pump number on the pipeline with the valve.

[0019] Preferably, the sound and light alarm module includes an identification unit for 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.

[0020] This application improves the safety protection capability of the hydraulic system and provides a strong guarantee for the safe operation of fatigue tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of a preferred embodiment of the hydraulic system oil leakage monitoring method of the present application.

[0022] Figure 2 The block diagram of the system is shown in Figure 2.

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

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

[0025] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the implementation of this application will be described in more detail in combination with the drawings in the implementation of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and cannot be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in combination with the drawings.

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

[0027] Step S1, obtaining oil leakage signals fed back by a plurality of photoelectric oil leakage sensors installed at different valves of each oil pump;

[0028] Step S2: for each oil pump, when only one photoelectric oil leakage sensor gives an oil leakage signal, an audible and visual alarm is issued;

[0029] Step S3: when there are two photoelectric oil leakage sensors giving oil leakage signals, obtain the monitoring picture collected by the installed camera, determine the oil pump that leaks oil based on the monitoring picture, and send a pump stop and pressure relief instruction to the oil pump.

[0030] This application adopts a combination of software and hardware design. The hardware is the execution mechanism for acquisition and control. The system composition block diagram is as follows Figure 2As shown in the figure, the system adopts the Internet of Things architecture design. The upper computer software of the application layer is written in the visual language LabView, which can remotely monitor the oil leakage status in real time, and intuitively display it on the computer interface, and save the status information in real time. The lower computer uses a programmable logic controller, namely PLC, as the control core. The perception layer of the Internet of Things is composed of an oil receiving box, an oil leakage sensor, an intelligent camera, and a PLC, which completes the oil leakage monitoring and oil pump control functions of the hydraulic system. The network layer uses optical fiber, network cable, and switches to form a local area network to complete the upload and download of monitoring and control data.

[0031] In some optional embodiments, in step S1, the photoelectric oil leakage sensor is arranged in an oil receiving box, and the oil receiving box includes two box bodies, each box body has a bottom edge and a front side edge, a left side edge, a right side edge and a rear side edge, the front side edge has a plurality of semicircular notches, and the two box bodies are connected through the front side edges to form a plurality of circular notches after the connection, and the plurality of circular notches are respectively located below the valves of the oil pump pipelines arranged side by side.

[0032] In some optional embodiments, a through hole is provided on the front side of the box body. After the front sides of the two box bodies are connected, the through holes on the front sides are aligned so that the oil in any box body can flow into the other box body after reaching the height of the through hole, and the photoelectric oil leakage sensor is provided in one of the box bodies.

[0033] In order to realize real-time monitoring of oil leakage and oil injection of high and low pressure valves in hydraulic pipelines, this application designs a special oil receiving box, such as Figure 3 As shown, two boxes are butted together. The boxes are used to collect leaked oil, and the circular notch is used to place pipelines. For example, there are four pipelines arranged side by side. Therefore, each oil receiving box can monitor four-way valves. The oil receiving box is usually designed to be divided into two parts, large and small, connected in the middle with screws, which is convenient for disassembly and assembly, and convenient for repairing hydraulic pipelines. The two parts of the box body have two through holes at the connection, connecting the two sides, so that when the oil on one side reaches a certain height, it will flow to the other side. Therefore, only one photoelectric oil leakage sensor can be placed in the box body on one side of the oil receiving box. The parameters of the photoelectric oil leakage sensor are as follows: Figure 4 As shown, the digital switch signal is output and connected to the PLC to monitor the oil leakage status in real time.

[0034] In order to facilitate disassembly and later maintenance, the oil leakage sensor is fixed on a customized telescopic rod, which can be freely retracted and taken away when disassembled, without affecting the maintenance work of the hydraulic valve, thus improving work efficiency. The oil receiving box of the present application realizes the monitoring of oil leakage and oil injection of the valve, and digitizes the accident status of oil leakage and oil injection.

[0035] In step S2, when only one sensor alarms, only sound and light alarms are performed to prompt the on-duty personnel to go to the site to check whether there is an oil leak. In step S3, if more than two sensors alarm at the same time, combined with the alarm signal of intelligent video monitoring, it means that there is oil injection. The upper computer software automatically determines which oil pump is injecting oil and automatically sends a command to stop the pump and relieve pressure to avoid the expansion of the accident and ensure the safety of the hydraulic system.

[0036] The above process is realized on the host computer through monitoring software. The host computer is set up in the control center on the second floor of the laboratory. It is connected to the monitoring PLC of the pump station by switches, optical fibers, network cables, 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 oil injection situations.

[0037] In some optional implementations, in step S3, the oil pump number is pasted on a pipeline with a valve so that the camera can identify the oil pump that leaks or sprays oil.

[0038] In this embodiment, in order to improve the accuracy of identifying oil leakage and oil spraying of hydraulic valves, an intelligent camera is used. The camera has an intelligent cross-border detection function, which can intelligently identify the monitoring of the specified area. If oil leakage or oil spraying occurs, an alarm signal can be output and the video can be automatically saved. The alarm signal is a digital signal of the switching quantity and is connected to the PLC for centralized monitoring. In order to effectively identify which oil pump is alarming, a striking oil pump number is pasted on the high-voltage output interface.

[0039] In some optional embodiments, step S2 further includes, in a pre-constructed hydraulic system pipeline model, explicitly marking 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.

[0040] The present application can monitor the oil leakage and injection status in real time through the touch screen connected to the oil pump monitoring PLC, and vividly indicate the monitoring status and corresponding position of the oil leakage sensor in the interface. In addition, in this embodiment, if an alarm occurs, it will be marked with a red indicator light, or the leaking valves, pipelines, etc. in the pre-built hydraulic system pipeline model will be highlighted or marked with special colors.

[0041] This application designs a set of oil leakage monitoring devices for hydraulic systems through the combination of software and hardware technologies, realizes the functions of intelligent identification, automatic alarm, and automatic pump stop, improves the safety protection performance of the hydraulic system, lays the foundation for the digital management of the laboratory, has a low investment cost, and can be applied in similar scenarios

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

[0043] An oil leakage signal acquisition module is used to obtain oil leakage signals fed back by multiple photoelectric oil leakage sensors installed at different valves of each oil pump;

[0044] The sound and light alarm module is used to send out a sound and light alarm for each oil pump when only one photoelectric oil leakage sensor gives an oil leakage signal;

[0045] The oil leakage analysis module is used to obtain the monitoring picture collected by the installed camera when there are two photoelectric oil leakage sensors giving oil leakage signals, determine the oil pump that leaks oil based on the monitoring picture, and send a pump stop and pressure relief instruction to the oil pump.

[0046] In some optional embodiments, the photoelectric oil leakage sensor is arranged in an oil collecting box, which includes two box bodies, each box body having a bottom edge and a front side edge, a left side edge, a right side edge and a rear side edge, the front side edge has a plurality of semicircular notches, and the two box bodies are connected via the front side edges to form a plurality of circular notches, and the plurality of circular notches are respectively located below the valves of the oil pump pipelines arranged side by side.

[0047] In some optional embodiments, a through hole is provided on the front side of the box body. After the front sides of the two box bodies are connected, the through holes on the front sides are aligned so that the oil in any box body can flow into the other box body after reaching the height of the through hole, and the photoelectric oil leakage sensor is provided in one of the box bodies.

[0048] In some optional embodiments, in the oil leakage analysis module, the camera can identify the oil pump that is leaking and spraying oil by pasting the oil pump number on the pipeline with a valve.

[0049] In some optional embodiments, the sound and light alarm module includes an identification unit for 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 a pre-constructed hydraulic system pipeline model.

[0050] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for monitoring oil leakage in a hydraulic system, characterized in that: include: Step S1, obtaining oil leakage signals fed back by a plurality of photoelectric oil leakage sensors installed at different valves of each oil pump; Step S2: for each oil pump, when only one photoelectric oil leakage sensor gives an oil leakage signal, an audible and visual alarm is issued; Step S3: when there are two photoelectric oil leakage sensors giving oil leakage signals, obtain the monitoring picture collected by the installed camera, determine the oil pump that leaks oil based on the monitoring picture, and send a pump stop and pressure relief instruction to the oil pump.

2. The method for monitoring oil leakage in a hydraulic system according to claim 1, characterized in that: In step S1, the photoelectric oil leakage sensor is arranged in an oil receiving box, and the oil receiving box includes two box bodies, each of which has a bottom edge and a front side edge, a left side edge, a right side edge and a rear side edge, and the front side edge has a plurality of semicircular notches. The two box bodies are butt-jointed through the front side edges to form a plurality of circular notches after the butt-jointing, and the plurality of circular notches are respectively located below the valves of the oil pump pipelines arranged side by side.

3. The method for monitoring oil leakage in a hydraulic system according to claim 2, characterized in that: A through hole is provided on the front side of the box body. After the front sides of the two box bodies are butted, the through holes on the front sides are aligned so that the oil in any box body can flow into the other box body after reaching the height of the through hole. The photoelectric oil leakage sensor is arranged in one of the box bodies.

4. The method for monitoring oil leakage in a hydraulic system according to claim 1, characterized in that: In step S3, the oil pump number is pasted on the pipeline with the valve so that the camera can identify the oil pump that leaks or sprays oil.

5. The method for monitoring oil leakage in a hydraulic system according to claim 1, characterized in that: Step S2 further includes, in the pre-constructed hydraulic system pipeline model, explicitly marking 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.

6. A hydraulic system oil leakage monitoring device, characterized in that: include: An oil leakage signal acquisition module is used to obtain oil leakage signals fed back by multiple photoelectric oil leakage sensors installed at different valves of each oil pump; The sound and light alarm module is used to send out a sound and light alarm for each oil pump when only one photoelectric oil leakage sensor gives an oil leakage signal; The oil leakage analysis module is used to obtain the monitoring picture collected by the installed camera when there are two photoelectric oil leakage sensors giving oil leakage signals, determine the oil pump that leaks oil based on the monitoring picture, and send a pump stop and pressure relief instruction to the oil pump.

7. The hydraulic system oil leakage monitoring device according to claim 6, characterized in that: The photoelectric oil leakage sensor is arranged in an oil receiving box, which includes two box bodies, each of which has a bottom edge and a front side edge, a left side edge, a right side edge and a rear side edge, and the front side edge has a plurality of semicircular notches. The two box bodies are butt-jointed through the front side edges to form a plurality of circular notches, and the plurality of circular notches are respectively located below the valves of the oil pump pipelines arranged side by side.

8. The hydraulic system oil leakage monitoring device according to claim 7, characterized in that: A through hole is provided on the front side of the box body. After the front sides of the two box bodies are butted, the through holes on the front sides are aligned so that the oil in any box body can flow into the other box body after reaching the height of the through hole. The photoelectric oil leakage sensor is arranged in one of the box bodies.

9. The hydraulic system oil leakage monitoring device according to claim 6, characterized in that: In the oil leakage analysis module, the oil pump number is pasted on the pipeline with a valve so that the camera can identify the oil pump that leaks and sprays oil.

10. The hydraulic system oil leakage monitoring device according to claim 6, characterized in that: The sound and light alarm module includes an identification unit for explicitly identifying 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.

Images