Flexible detection device for submarine pipeline welding process

Abstract

The invention discloses a submarine pipeline welding process flexible detection device, and belongs to the field of welding process detection. The detection device mainly comprises a pressure-resistant camera cabin, a macro camera, an optical fiber, a lens and an optical filter. The camera cabin is used for protecting a camera in a high-voltage environment, and the camera is connected with a camera transmission optical fiber port lens through an optical fiber to transmit pictures shot by the optical fiber port lens. The welding detection device works in a seabed high-pressure environment, and provides technical support for seabed automatic welding and teleoperation; in the welding process, the camera bin is fixed to any position of the welding platform and does not move along with the welding gun, the low-weight lens is matched with the flexible image transmission bundle to move along with the welding gun, and molten pool images are shot in real time. The optical fiber is matched with a proper optical filter to flexibly detect different positions of a welding arc and a molten pool, so that inconvenience caused by overlarge size and weight of a camera bin is effectively improved, and the monitoring requirement of the welding process in a special environment is met.

Description

Technical Field

[0001] The invention relates to a flexible detection device for a submarine pipeline welding process, belonging to the field of welding equipment. Background Art

[0002] my country has laid a large number of submarine pipelines in the South China Sea, requiring appropriate maintenance and repair preparations. Underwater welding technology has become a key process for submarine pipeline maintenance in deep-sea engineering activities. For coastal countries, the development of underwater welding technology has significant economic and strategic significance for the development and protection of marine resources. my country, in particular, has laid a large number of submarine pipelines in the South my country Sea, and there is a need for pipeline maintenance. However, deep waters are inaccessible to personnel, forcing them to rely on machines for underwater operations. Therefore, flexible detection devices for submarine pipeline welding processes play a vital role in the normal operation of my country's submarine pipelines and are of great significance to maintaining my country's maritime security.

[0003] Arc morphology is a factor that directly affects the stability of the welding process and the quality of the welding. Accurately monitoring changes in arc morphology is crucial to maintaining the stability of the welding process and improving welding quality. However, compared with conventional land-based welding environments, the underwater welding environment has significant differences in the performance of arc morphology. Compared with the land-based welding environment, the dual effects of bubbles and high pressure in underwater welding make the arc behavior more complicated. In land-based welding, the arc is usually not disturbed by bubbles or water cooling effects, the arc morphology is relatively stable, and the welding process is relatively easy to control. Underwater, the formation of bubbles and the cooling effect of water, coupled with the effect of high pressure, cause the arc morphology to change dramatically and the arc instability to increase. "These special factors directly affect the stability of the welding process and increase the risk of welding defects. Therefore, during underwater welding, the impact of these special factors on arc behavior must be fully considered to ensure the stability of the welding process and the high-quality formation of welded joints. Summary of the Invention

[0004] The purpose of the present invention is to provide a device that can effectively prevent excessive pressure on the seabed during the welding process of submarine pipelines, and can also meet the requirements of flexible control of the welding process detection, so as to improve the welding process and quality. Currently, most existing welding detection devices are on land, while the application scenario of the present invention is on the seabed, which requires solving the problem of the high-pressure zone on the seabed. The present invention uses high-strength metal to make the camera chamber, which can effectively ensure the normal operation of the camera in a high-pressure environment. In addition, the present invention also uses a flexible image transmission bundle, which can flexibly control the detection position of the optical probe to meet the detection needs in different situations.

[0005] In order to achieve the above objectives, the present invention proposes a flexible detection device for submarine pipeline welding process, which is characterized by comprising: a pressure-resistant camera chamber (6) containing a macro camera (7), wherein the system can maintain a pressure fluctuation of ≤±0.1% in a water depth of 500 meters; an imaging module (3) installed at the end of the imaging bundle through a flexible imaging bundle (2), wherein the imaging bundle includes a plurality of gradient refractive index optical fibers and is equipped with a filter switching device (4).

[0006] A flexible detection device for submarine pipeline welding process, characterized in that an optical probe (1) is located 200 mm away from the welding work area to shoot the welding work process.

[0007] The filter (4-3) is at the connection point and can switch the filter. Filter A is 696nm for observing the arc, and filter B is 1000nm for detecting the molten pool.

[0008] A flexible detection device for submarine pipeline welding process, characterized in that the images captured by an optical probe (1) are transmitted to a screen on an imaging module (3) through a flexible image transmission bundle (2), and the images on the screen can be captured by a macro camera (7).

[0009] The flexible detection device for submarine pipeline welding process according to claim 1 is characterized in that the working distance of the macro camera (7) is 250 mm, and the imaging module (3) can fix the camera compartment (6) and keep it at a working distance of 250 mm.

[0010] A flexible detection device for submarine pipeline welding process is characterized in that a camera compartment front cover (5) and a camera compartment rear cover (8) seal the camera compartment (6) to ensure a sufficiently good waterproof effect.

[0011] A flexible detection device for submarine pipeline welding process is characterized in that: the camera compartment (6) is made of high-strength metal and can be used normally in a high-pressure environment, ensuring the normal operation of the macro camera (7).

[0012] A flexible detection device for a submarine pipeline welding process is characterized in that a filter switching device (4) can drive a filter clamping device (4-4) to switch filters by driving a gear (4-5).

[0013] Advantages of the present invention: The present invention has a sufficiently good pressure-proof design for the high-pressure environment on the seabed. The shell is made of low-density, high-strength metals such as titanium alloy, which has sufficient strength. In addition, it adopts a flexible optical fiber design, making the detection process more flexible and controllable, providing a new method for submarine pipeline welding detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1This is an exploded view of the welding flexibility detection device.

[0015] Figure 2 This is an exploded view of the filter switching mechanism.

[0016] In the figure: 1. Optical probe, 2. Flexible image transmission bundle, 3. Imaging module, 4. Filter switching device, (4-1. Gasket, 4-2. Large clamp, 4-3. Filter, 4-4. Filter holder, 4-5. Transmission gear, 4-6. Rack, 4-7. Motor), 5. Camera compartment front cover, 6. Camera compartment, 7. Macro camera, 8. Camera compartment back cover. DETAILED DESCRIPTION

[0017] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 It is a schematic diagram of the welding flexibility detection device.

[0018] Step 1: Verify that the flexible image bundle can be bent and rotated without damaging its structure. Verify the integrity and airtightness of the camera housing to ensure it can function properly under high pressure. Verify the integrity of the filter switching mechanism and its proper functioning, performing maintenance and lubrication. Verify that all components fit together properly.

[0019] Step 2: Fix the flexible detection device for the submarine pipeline welding process, connect the optical probe to the welding gun, and make the optical probe (1) face the welding point directly, and maintain a working distance of 200mm. Adjust the position of the flexible imaging beam (2), and place the lens and screen of the macro camera (7) at a working distance of 250mm. Install the filter switching device at the end of the imaging module and perform preliminary alignment of the filter to ensure that the filter switching can be performed normally.

[0020] Step 3: Before welding, check whether the imaging module (3) can work properly and whether the receiving end can quickly and accurately obtain images. Switch to appropriate lighting conditions and check whether the screen can clearly image. Then switch to the lighting conditions used during welding, check whether the filter is dirty, and select a filter that matches the welding brightness so that the receiving end can obtain a clear image.

[0021] Step 4: Set up an experimental environment with the same conditions as the seabed, set the pH value and pressure in a closed container to match the seabed environment, conduct a test welding experiment, and test the experimental values ​​to ensure that they are within the normal range to ensure that all components of the seabed welding flexibility detection device are working properly.

[0022] Step 5: Install a pressure sensor on the outer wall of the camera chamber. Every time the welding chamber dives 50 meters, check the pressure sensor value to ensure the normal operation of all parts.

[0023] Step 6: When the welding cabin dives to the specified depth and wraps around the submarine pipeline, the optical probe follows the welding torch to the part to be welded and prepares for work.

[0024] Step 7: When welding is in progress and the welding arc is detected, the motor in the filter switching device is driven, and a 696nm filter is selected to obtain an arc image. When observing the molten pool, the motor in the filter switching device is driven, and a 1000nm filter is selected to stably obtain the molten pool image.

[0025] Step 8: Analyze the welding quality based on the acquired molten pool and arc images.

Claims

1. A flexible detection device for submarine pipeline welding process, characterized in that: include: A pressure-resistant camera cabin (6) includes a macro camera (7), and the overall detection device can maintain a pressure fluctuation of ≤±0.1% in a water depth environment of 1-400 meters; a flexible image transmission bundle (2) includes a plurality of gradient refractive index optical fibers, an imaging module (3) is installed at the end, and a filter switching device (4) is provided; the filter switching device (4) is embedded in the imaging module (3) through a gasket (4-1), a large clamp (4-2) is equipped with a filter holder (4-4), the filter holder (4-4) clamps the filter (4-3), and is assembled in a rack (4-6); a gear (4-5) is assembled on the filter holder (4-4), driven by a motor (4-7), and moves with the rack (4-6).

2. The submarine pipeline welding process flexibility detection device according to claim 1 is characterized in that: The entire submarine pipeline welding system adopts submarine high-pressure dry welding. The welding part is isolated from the seawater by a welding cabin, and the cabin is filled with inert gas to form a dry high-pressure environment, which is balanced with the seabed pressure. During the submarine high-pressure dry welding process, the submarine pipeline welding device and the flexible detection device work in the welding cabin. The welding position is photographed by an optical probe, and the photographic image is transmitted to the imaging module through a flexible image beam and imaged on the screen. The filter switching device and the camera chamber are connected to the end of the imaging module. Depending on the shooting target, the filter switching device switches different filters to complete different detection tasks. The macro camera is inside the camera chamber and is used to shoot the screen on the imaging module to obtain detection information and transmit it to the information processing center.

3. The submarine pipeline welding process flexibility detection device according to claim 1 is characterized in that: The light-weight optical probe (1) is mounted on a welding robot arm or a welding gun holding fixture at a distance of 200 mm from the welding work area to photograph the welding process and detect the arc or molten pool by replacing the filter (4-3).

4. The submarine pipeline welding process flexibility detection device according to claim 1, characterized in that: The image captured by the optical probe (1) is transmitted to a screen on the imaging module (3) through a flexible image transmission bundle (2), the image on the screen is captured by a macro camera (7), and the image is focused by adjusting the camera (7).

5. The submarine pipeline welding process flexibility detection device according to claim 1 is characterized in that: The working distance of the macro camera (6) is 10-20 mm, and the imaging module (3) fixes the camera chamber (6) and is at a working distance of 250 mm.

6. The submarine pipeline welding process flexibility detection device according to claim 1, characterized in that: The camera compartment front cover (5) and the camera compartment rear cover (8) seal the camera compartment (6) to ensure a sufficiently good waterproof effect; The camera compartment (6) is made of high-strength metal and can be used normally in a high-pressure environment, thereby ensuring the normal operation of the macro camera (7).

7. The submarine pipeline welding process flexibility detection device according to claim 1, characterized in that: The filter switching device (4) switches the filter by driving the filter holder (4-4) via the driving gear (4-5).

8. The device for detecting flexibility of submarine pipeline welding process according to any one of claims 1 to 7, characterized in that: The device is used in deep-sea pipeline maintenance, nuclear reactor pressure vessel maintenance or offshore platform structural component welding.

9. The submarine pipeline welding process flexibility detection device according to claim 1, characterized in that: The device includes the following steps: Step 1: testing whether the flexible image transmission bundle can be bent and rotated without destroying the normal structure; testing the integrity and airtightness of the camera chamber to ensure that the camera chamber can ensure the normal operation of the macro camera under high-pressure environment; testing the integrity of the filter switching device to test whether the filter switching device can work properly, and performing maintenance and lubrication on the filter switching device; testing whether the coordination between various parts can be properly installed; Step 2: Fix the flexible detection device for the submarine pipeline welding process, fix the optical probe to the welding gun, make the optical probe (1) face the welding point, and maintain a working distance of 200 mm; adjust the position of the flexible imaging beam (2), and place the lens and screen of the macro camera (7) at a working distance of 250 mm; install the filter switching device at the end of the imaging module, and perform preliminary alignment of the filter to ensure that the filter can be switched normally; Step 3: Before welding, check whether the imaging module (3) can work properly and whether the receiving end can quickly and accurately obtain the image, and switch to appropriate lighting conditions to check whether the screen can clearly image; then switch to the lighting conditions during welding, check whether the filter is dirty, and select a filter that matches the welding brightness so that the receiving end can obtain a clear image; Step 4: Set up an experimental environment with the same conditions as the seabed. Set the pH value and pressure in a sealed container to match the seabed environment. Conduct a test welding experiment and check the experimental values ​​to ensure they are within the normal range to ensure that all components of the seabed welding flexibility detection device are functioning properly. Step 5: Install a pressure sensor on the outer wall of the camera chamber. Every time the welding chamber dives 50 meters, check the pressure sensor value to ensure the normal operation of all parts. Step 6: When the welding cabin dives to the specified depth and wraps around the submarine pipeline, the optical probe moves with the welding torch to the part to be welded and prepares for work; Step 7: When welding is in progress and the welding arc is detected, the motor in the filter switching device is driven, and a 696nm filter is selected to obtain an arc image. When observing the molten pool, the motor in the filter switching device is driven, and a 1000nm filter is selected to stably obtain the molten pool image. Step 8: Analyze the welding quality based on the acquired molten pool and arc images.

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