Off-line acoustic emission detection system for vertical steel oil tank bottom plate

Abstract

The utility model relates to an off-line acoustic emission detection system for a vertical steel oil tank bottom plate, and belongs to the field of oil tank detection. According to the system, the mode that in the traditional acoustic emission detection process, an acoustic emission sensor arranged in a dangerous area, a detection host arranged in a safe area and an analysis computer are connected in real time is changed; the acoustic emission detection device is moved to a safe area, detection data are downloaded to the analysis computer and analyzed and processed by the data processing system, real-time connection between the acoustic emission detection device and the detection host and between the acoustic emission detection device and the analysis computer is not needed, and the problem that signal attenuation is serious when a transmission cable between the to-be-detected equipment in a dangerous area and the detection host is too long can be effectively solved. The device can be used for safe and high-quality acoustic emission detection of equipment such as a cave depot oil tank far away from a safe area.

Description

Technical Field

[0001] This utility model belongs to the field of oil tank inspection, specifically relating to an offline acoustic emission detection system for the bottom plate of a vertical steel oil tank. Background Technology

[0002] Acoustic emission testing (AE) is a dynamic non-destructive testing technology with low economic cost and minimal workload. It also possesses advantages that other non-destructive testing methods cannot achieve, such as real-time dynamic monitoring of defects. Since the acoustic emission waves originate from the defect itself rather than from the outside, it has higher sensitivity and recognition accuracy, and it does not require production shutdown or tank opening. Therefore, AE is widely used in the field of offline AE testing systems for the bottom plates of atmospheric pressure vertical steel oil tanks, and it has extremely high application value in oil tank health management and maintenance decision-making.

[0003] Existing multi-channel acoustic emission testing instruments mostly adopt a technical mode of parallel driving of multiple sensor signals by a single testing host for acquisition, conversion, and storage; intrinsically safe acoustic emission sensors with pre-amplification function are placed in hazardous areas to sense signals; non-explosion-proof testing equipment such as the testing host and analysis computer, which are connected to the acoustic emission sensors in real time, are placed in safe areas, and the acoustic emission sensors are powered and the detection signals are received through a signal isolation safety barrier. This testing mode has the following disadvantages:

[0004] 1. The on-site equipment has a large deployment range and long connection distances. Each channel cable needs 60 to 120 meters to transmit the signal to the safe area. Installation and dismantling in confined spaces such as tank rooms and tunnels is time-consuming and labor-intensive.

[0005] 2. The detection system has many connection points between its various units, such as acoustic emission sensors, detection host, and analysis computer. This not only affects explosion-proof safety and signal-to-noise ratio, but also makes the interfaces prone to damage due to frequent disassembly and assembly.

[0006] 3. The maximum distance for acoustic emission signals to be transmitted over a long distance using coaxial cables should generally not exceed 200m; otherwise, the signal will be severely attenuated. However, the distance between oil tanks in domestic oil storage caverns and the safe zone outside the cavern often far exceeds this length.

[0007] In conclusion, this acoustic emission detection system cannot meet the detection requirements of underground oil tanks. Summary of the Invention

[0008] The purpose of this utility model is to provide an offline acoustic emission detection system for the bottom plate of a vertical steel oil tank, which has a short on-site connection distance and few connection endpoints and is suitable for acoustic emission detection of underground oil tanks.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] An offline acoustic emission detection system for the bottom plate of a vertical steel oil tank includes a synchronization device, a data processing system, and acoustic emission detection devices installed around the oil tank.

[0011] The acoustic emission detection device includes a housing, and a power module, an integrated control module, and a storage medium disposed in the housing. The power module, the storage medium, and the integrated control module are electrically connected.

[0012] One side of the housing is provided with an indicator light module, a data transmission interface, and a power switch electrically connected to the integrated control module; the data transmission interface is also a charging interface, and a charging cable can be connected to charge the acoustic emission detection device using a 220V power supply; the other side of the housing is provided with a start button, a sensor interface, and a synchronization interface, the sensor interface being electrically connected to the acoustic emission sensor; the start button, the sensor interface, and the synchronization interface are electrically connected to the integrated control module;

[0013] The acoustic emission sensor is mounted on the outer wall of the oil tank at equal intervals and heights around the periphery using a magnetic clamp.

[0014] The synchronization device includes a synchronizer and a synchronization cable. The synchronization cable connects each acoustic emission detection device in series and is electrically connected to the synchronizer through a synchronization interface. The acoustic emission detection device is electrically connected to the data processing system through the data transmission interface.

[0015] Preferably, the offline acoustic emission detection system for the bottom plate of the vertical steel oil tank also includes auxiliary devices, which include a grounding resistance tester and an oil and gas concentration detector, used to detect the grounding resistance of the oil tank and the oil and gas concentration on site.

[0016] Furthermore, the outer shell is milled from a single aluminum ingot using a CNC machining center, the interior of the outer shell is entirely encapsulated with insulating and thermally conductive sealant, and the surface of the outer shell is anodized and blackened and has heat dissipation fins.

[0017] Furthermore, the indicator light module is provided with a protective cover; the data transmission interface and the power switch are arranged side by side and are also provided with protective covers.

[0018] Furthermore, the indicator module includes a power indicator (white), a breathing light (white), a data acquisition status light (green), an abnormal indicator (red), a synchronization signal indicator (orange), and a coupling light (blue); the breathing light is also an impact indicator, and the indicator flashes red when an impact signal is acquired.

[0019] Furthermore, the synchronization interface is provided in two parts, one for input and one for output.

[0020] Furthermore, the acoustic emission sensor is equipped with a preamplifier.

[0021] Furthermore, a handle is provided on the outer casing.

[0022] The beneficial effects of this utility model are as follows:

[0023] The traditional structure of a single detection host controlling multi-channel signal acquisition, conversion, and storage is improved to allow each acoustic emission detection device to independently acquire, convert, and store signals, with each device synchronized by a clock. This changes the traditional acoustic emission detection process where the acoustic emission sensors in the hazardous area are connected in real-time to the detection host and analysis computer in the safe area. After acquiring signals in the hazardous area, each detection device moves to the safe area and downloads the data to the analysis computer for analysis. This eliminates the need for real-time connection between the acoustic emission detection device and the detection host / analysis computer, effectively overcoming the problem of severe signal attenuation when the transmission cable between the device in the hazardous area and the detection host is too long. This improves the applicability and reliability of acoustic emission detection technology for detecting equipment such as underground storage tanks far from the safe area.

[0024] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a structural diagram of an acoustic emission detection device according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the working state of an offline acoustic emission detection system for the bottom plate of a vertical steel oil tank, as shown in an embodiment of this utility model.

[0027] Figure labeling: 1. Start button; 2. Sensor interface; 3. Synchronization interface; 4. Acoustic emission sensor; 5. Low-noise signal line; 6. Data transmission interface and power switch module; 7. Indicator light module; 8. Housing; 9. Handle; 10. Heat sink. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0031] Please see Figure 1-2 The preferred embodiment of this application shows an offline acoustic emission detection system for the bottom plate of a vertical steel oil tank, which includes multiple acoustic emission detection devices, a synchronization device, and a data processing system.

[0032] The acoustic emission detection device includes a housing 8, and a power module, an integrated control module, and a storage medium disposed in the housing 8. The power module, the storage medium, and the integrated control module are electrically connected.

[0033] The housing 8 is designed according to explosion-proof standards. It is made from a single piece of aluminum ingot through CNC machining center. The surface is treated with anodized blackening and has heat dissipation fins 10 to enhance heat dissipation and prevent excessive temperature rise from causing zero-point drift of the acquisition circuit.

[0034] One side of the housing 8 is provided with an indicator light module 7, a data transmission interface, and a power switch module 6, which are electrically connected to the aforementioned integrated control module, and is protected by a protective cover. The indicator light module 7 includes:

[0035] Power indicator light (white): The light illuminates when the power switch is pressed.

[0036] Breathing light (white): Pressing start button 1 will turn the indicator light green, and it will flash after about 10 seconds, indicating that the hardware has started normally. Pressing start button 1 again will enter the acquisition state. When an impact signal is acquired, the indicator light will flash red.

[0037] Data Acquisition Status Indicator (Green): The indicator light will illuminate after pressing Start Button 1.

[0038] Abnormal indicator light (red): This light will illuminate when an abnormality is detected in the storage medium or device.

[0039] Synchronization signal indicator (orange): The indicator flashes after the signal is synchronized.

[0040] Coupler LED (blue): When the signal exceeds 90dB, the blue LED lights up and flashes.

[0041] On the other side of the housing 8, there is a start button 1, a sensor interface 2, and a synchronization interface 3. The sensor interface 2 is connected to the acoustic emission sensor 4 via a low-noise signal line 5. The start button 1, sensor interface 2, and synchronization interface 3 are all electrically connected to the integrated control module.

[0042] It should be noted that there are two synchronous interfaces 3, one as an input and the other as an output.

[0043] Specifically, the acoustic emission sensor 4 is also equipped with a preamplifier.

[0044] Specifically, the acoustic emission detection device is designed as an embedded system based on SOC (a single chip containing ARM and FPGA) and LINUX, and is equipped with a built-in clock.

[0045] Specifically, the outer casing 8 is also equipped with a handle 9 for easy operation and transfer.

[0046] The synchronization device includes a synchronizer and multiple synchronization cables. The synchronization cables connect each acoustic emission detection device in series with the synchronizer via synchronization interface 3.

[0047] Specifically, the working principle of the above-mentioned synchronization device is as follows:

[0048] During the testing process, each acoustic emission testing device uses its own clock for A / D sampling. To ensure positioning accuracy and precision, an additional 100Hz synchronization signal is added during data acquisition. A synchronization pulse is sent every 10ms via a synchronizer. Upon receiving each synchronization pulse, the clocks of each acoustic emission testing device synchronize once. At other times, each device uses its internal quartz crystal oscillator for timing. Considering the frequency stability of the quartz crystal at ±20ppm, the time error of each acoustic emission testing device is ±10ms × 20 × 10. -6 =±0.2us. The synchronization error of the acoustic emission detection devices in each channel was measured to be ±0.4us; based on the speed of sound propagation in steel of 5.9mm / us: 5.9mm / us × 0.8us = 4.72mm ≈ 5mm.

[0049] In summary, with the assistance of a synchronization device, this acoustic emission detection system can detect leaks longer than 5 mm.

[0050] Preferably, the offline acoustic emission detection system for the bottom plate of the vertical steel oil tank shown in this application also includes auxiliary devices, including a grounding resistance tester and an oil and gas concentration detector, which are used to detect the grounding resistance of the oil tank and the oil and gas concentration on site to ensure the safety of the detection operation.

[0051] Working principle:

[0052] Please refer to Figure 2 Multiple acoustic emission detection devices are set around the oil tank to be tested. The acoustic emission sensors are installed on the outer wall of the oil tank at equal intervals and heights around the tank using magnetic clamps. The acoustic emission detection devices are connected in series and synchronized using a synchronization device.

[0053] The acoustic emission detection device is then activated to detect and collect acoustic emission signals generated by leakage and corrosion in the bottom plate of the oil tank, and the collected signals are stored in a storage medium.

[0054] After the data collection is completed, the collected information is transmitted to the data processing system through data transmission interface 4. The collected information is analyzed, integrated, and finally a test report is obtained.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An offline acoustic emission detection system for the bottom plate of a vertical steel oil tank, characterized in that, Includes a synchronization device, a data processing system, and acoustic emission detection devices installed around the oil tank; The acoustic emission detection device includes a housing, and a power module, an integrated control module, and a storage medium disposed in the housing. The power module, the storage medium, and the integrated control module are electrically connected. One side of the housing is provided with an indicator light module, a data transmission interface, and a power switch electrically connected to the integrated control module; the data transmission interface also serves as a charging interface for charging the acoustic emission detection device; the other side of the housing is provided with a start button, a sensor interface, and a synchronization interface, the sensor interface being electrically connected to the acoustic emission sensor; the start button, the sensor interface, and the synchronization interface are electrically connected to the integrated control module. The acoustic emission sensor is mounted on the outer wall of the oil tank at equal intervals and heights around the periphery using a magnetic clamp. The synchronization device includes a synchronizer and a synchronization cable. The synchronization cable connects each acoustic emission detection device in series and is electrically connected to the synchronizer through a synchronization interface. The acoustic emission detection device is electrically connected to the data processing system through the data transmission interface.

2. The offline acoustic emission detection system for the bottom plate of a vertical steel oil tank as described in claim 1, characterized in that, It also includes auxiliary devices, including a grounding resistance tester and an oil and gas concentration detector, used to detect the grounding resistance of the oil tank and the oil and gas concentration on site.

3. The offline acoustic emission detection system for the bottom plate of a vertical steel oil tank as described in claim 1, characterized in that, The outer shell is milled from a single aluminum ingot using a CNC machining center. The interior of the outer shell is completely encapsulated with insulating and thermally conductive sealant. The surface of the outer shell is anodized and blackened and has heat dissipation fins.

4. The offline acoustic emission detection system for the bottom plate of a vertical steel oil tank as described in claim 1, characterized in that, The indicator light module is equipped with a protective cover; the data transmission interface and the power switch are arranged side by side and are also equipped with protective covers.

5. The offline acoustic emission detection system for the bottom plate of a vertical steel oil tank as described in claim 1, characterized in that, The indicator module includes a power indicator, a breathing light, a data acquisition status light, an abnormal indicator, a synchronization signal indicator, and a coupling light; the breathing light also serves as an impact indicator, flashing when an impact signal is acquired.

6. The offline acoustic emission detection system for the bottom plate of a vertical steel oil tank as described in claim 1, characterized in that, The synchronization interface is provided in two parts, serving as an input and an output respectively.

7. The offline acoustic emission detection system for the bottom plate of a vertical steel oil tank as described in claim 1, characterized in that, The acoustic emission sensor is equipped with a preamplifier.

8. The offline acoustic emission detection system for the bottom plate of a vertical steel oil tank as described in claim 1, characterized in that, The outer casing is provided with a handle.

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