A gas pipeline airtightness detection device and a use method thereof

Abstract

The application provides a gas pipeline airtightness detection device, which comprises a mounting bracket, a mounting plate horizontally arranged and fixed at the top of the mounting bracket, a water tank fixedly connected to the mounting plate, a circulating system connected to the water tank, the circulating system containing a low-concentration fluorescent indicator, an air-drying assembly fixed to the discharge side of the water tank, a detection box fixedly installed on the mounting plate, a UV LED lamp installed in the detection box, a visual detection system arranged in the detection box, and a transmission assembly comprising a first clamping device and a second clamping device, the first clamping device clamping the gas pipeline and sequentially feeding the gas pipeline into the air-drying assembly and the detection box, and the second clamping device clamping the gas pipeline out of the detection box. The airtightness detection device can quickly and accurately detect the gas pipeline, determine whether the gas pipeline has quality defects, and has high detection consistency.

Description

Technical Field

[0001] This invention relates to the field of gas pipeline inspection, specifically to a gas pipeline airtightness testing device and its usage method. Background Technology

[0002] After gas pipelines are manufactured, they need to undergo strict airtightness testing to eliminate defects such as micropores, cracks, and seams. This is an essential process to ensure the safe transportation of gas. Currently, the existing technology for airtightness testing of gas pipelines generally uses water immersion testing, which involves placing the gas pipeline in a clean water tank and introducing air to observe whether bubbles are generated, thereby judging the quality of the gas pipeline and whether it has any quality defects.

[0003] However, traditional immersion testing has many drawbacks. Its detection sensitivity is relatively low. For tiny cracks or pores, the bubbles are small and the formation speed is slow. If visual observation is used, factors such as water fluctuations, light refraction, and bubble diffusion can easily lead to missed or false detections. In addition, traditional testing methods still rely on manual visual inspection, which is labor-intensive and subject to strong subjective factors. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a gas pipeline airtightness testing device and its usage method, which can quickly and accurately test gas pipelines, determine whether they have quality defects, and has high testing consistency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a gas pipeline airtightness testing device, comprising:

[0006] A mounting bracket, wherein a horizontally mounted mounting plate is fixed to the top of the mounting bracket;

[0007] A water tank is fixedly connected to a mounting plate, and the water tank is connected to a circulation system containing a low concentration of fluorescent indicator.

[0008] A drying assembly, wherein the drying assembly is fixed to the discharge side of the water tank;

[0009] A testing box is fixedly mounted on the mounting plate. An ultraviolet LED lamp tube is installed in the testing box, and a vision inspection system is also provided in the testing box.

[0010] A transmission assembly includes a first clamping device and a second clamping device. The first clamping device clamps the gas pipeline and sequentially feeds it into the drying assembly and the testing box. The second clamping device clamps the gas pipeline out of the testing box and transports it.

[0011] Furthermore, the circulation system includes a circulation hole in the water tank, the circulation hole, a liquid storage tank, and a water pump are connected through a circulation pipeline, and the end of the water pump is reconnected to the water tank through the circulation pipeline.

[0012] Furthermore, a filter screen is fixedly connected to the circulation hole, and a fluorescence concentration detection sensor is installed inside the liquid storage tank.

[0013] Furthermore, the transmission component includes a fixed frame, on which a first horizontal slide rail and a second horizontal slide rail are fixedly installed. The first clamping device and the second clamping device are respectively installed on the first horizontal slide rail and the second horizontal slide rail, and are respectively located on both sides of the detection box.

[0014] Furthermore, the visual inspection system includes multiple sets of ultraviolet cameras, and the ultraviolet cameras are signal-connected to the display terminal.

[0015] Furthermore, the air-drying component is an annular air knife, and a connecting beam is fixed between the first horizontal slide rail and the second horizontal slide rail, with the annular air knife fixed on the connecting beam.

[0016] The present invention also employs a method for using a gas pipeline airtightness testing device, comprising the following steps:

[0017] S1: Prepare the test solution, which contains a low concentration of fluorescent indicator, and inject the test solution into the storage tank;

[0018] S2: Place the gas pipeline to be tested into the water tank and seal both ends. Then, introduce the test liquid into the water tank so that the surface of the gas pipeline is submerged in the test liquid. Fill the gas pipeline with high-pressure dry air and stabilize the pressure for a period of time so that bubbles are continuously generated at the leak point.

[0019] S3: Discharge the detection liquid into the storage tank, exposing the gas pipe. The bubbles in the leak area on the gas pipe burst instantly, splashing the fluorescent agent around the leak. Then, the gas pipe is passed into the drying assembly for drying.

[0020] S4: After the gas pipeline has been dried, it is put into a closed testing chamber for testing. When a dense yellow-green fluorescence appears on the terminal, the terminal automatically collects the image and issues an alarm to notify that there is a leak in the gas pipeline. At this time, the gas pipeline is either reworked or scrapped.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This gas pipeline air tightness testing device has a simple structure and can quickly and accurately test gas pipelines to determine whether they have quality defects. It has high testing consistency, reduces the probability of missing micro-leakage, and ensures the safe use of gas pipelines.

[0023] 2. After the gas pipeline is immersed in the detection liquid, its surface is air-dried. Bright and dense fluorescent patches will be produced at the points where the bubbles burst, which effectively improves the accuracy of the detection results.

[0024] 3. The first clamping device can clamp the gas pipeline and pass it through the drying component and the testing box in sequence. The second clamping device can clamp the gas pipeline sent out of the testing box, so that there are no blind spots in any area of ​​the gas pipeline during the test, ensuring the accuracy of the test. Attached Figure Description

[0025] Figure 1 This is a structural diagram of the present invention;

[0026] Figure 2 This is a structural diagram of the detection box of the present invention;

[0027] Figure 3 This is a structural diagram of the water tank of the present invention;

[0028] In the diagram: 1. Mounting bracket; 2. Mounting plate; 3. Water tank; 4. Drying assembly; 5. Testing box; 6. UV LED tube; 7. First clamping device; 8. Second clamping device; 9. Air knife; 10. Gas pipeline; 11. Liquid storage tank; 12. Water pump; 13. Filter screen; 14. Fixed stand; 15. Horizontal slide rail; 16. UV camera; 17. Blackout curtain; 18. Circulation pipeline; 19. Waterproof cylinder; 20. Sealing head; 21. Gas injection pipe; Detailed Implementation

[0029] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] See Figures 1 to 3 The gas pipeline airtightness testing device shown includes:

[0031] A mounting bracket 1, wherein a horizontally mounted mounting plate 2 is fixed to the top of the mounting bracket 1;

[0032] A water tank 3 is fixedly connected to the mounting plate 2. The water tank 3 is connected to a circulation system, which contains a low concentration of fluorescent indicator.

[0033] A drying component 4 is fixed to the discharge side of the water tank 3;

[0034] A detection box 5 is fixedly installed on the mounting plate 2. An ultraviolet LED tube 6 is installed in the detection box 5, and a vision inspection system is also provided in the detection box 5.

[0035] A transmission assembly includes a first clamping device 7 and a second clamping device 8. The first clamping device 7 clamps the gas pipeline 10 and sequentially feeds it into the drying assembly 4 and the testing box 5. The second clamping device 8 clamps the gas pipeline 10 out of the testing box 5 and transports it.

[0036] In operation, the operator first places the gas pipeline 10 into the water tank 3 without detection liquid and abuts it against the sealing head 20 on the left side of the water tank 3. Then, the operator activates the clamping device on the right side of the water tank 3. The clamping device uses a waterproof cylinder 19, with the sealing head 20 also connected to its cylinder rod. The sealing surface of the sealing head 20 can be made of sealing rubber. This clamps the pipeline. At this time, detection liquid is introduced into the water tank 3, and the air injection pipe 21 connected to the sealing head 20 introduces high-pressure, dry compressed air into the gas pipeline 10, maintaining a constant detection pressure inside the pipeline. If there is a tiny leak in the pipeline, bubbles will form at the leak point. With continuous inflation, the bubbles will gradually grow larger and detach from the leak point, but they will also persist. As new bubbles continue to form, and finally, after the detection liquid is rapidly discharged from the water tank 3 into the circulation system, the remaining detection liquid will form a solution film on the entire gas pipeline 10. At the leak point, the solution film will also generate bubbles in that area. With continuous inflation, the bubbles will burst instantly, forming micro-jet streams around the leak point at extremely high speeds. This allows the solution to penetrate deeper into the tiny area around the leak point (microscopically, the pipeline surface is uneven), thus forming dense burst points around the leak point. At this time, the first clamping device 7 clamps the gas pipeline 10 and moves it forward, leaving the water tank 33 and entering the drying assembly 4. The drying assembly 4 surrounds the gas pipeline 10. A uniform annular air curtain is formed around the perimeter, sweeping the outer wall of the pipe from all directions and removing loose fluorescent droplets adhering to the pipe surface (the air-drying component 4 uses a weak airflow mode to remove only the freely flowing droplets on the surface of the gas pipe 10; the fluorescent liquid cannot be removed from the leak area because it is deeply embedded). At this time, the gas pipe 10 enters the detection chamber 5 and is irradiated by ultraviolet LED lamps. In conjunction with the ultraviolet visual inspection system, specifically, the ultraviolet visual inspection system uses multiple ultraviolet cameras 16 arranged in a circle to take pictures of the gas pipe 10 and transmit them to the terminal for display. The operator can visually inspect the screen on the computer terminal to determine the bubble burst point. The depth of the light spot generated in the burst point area is significantly higher than that in other areas. Of course, ultraviolet vision inspection systems are equipped with automatic recognition software, which can transmit the collected images to the terminal's built-in algorithm software for automatic judgment (ultraviolet vision inspection systems are existing technology and can be purchased directly on the market). This quickly detects burst points and accurately determines pipeline leaks and their specific locations. During inspection, due to the movement of the first clamping device 7, the end of the gas pipeline 10 will extend from the inspection box 5. The second clamping device 8 smoothly clamps the inspected gas pipeline 10 from the inspection box 5, completing a single pipeline leak detection operation. The length of the inspection box must be shorter than the gas pipeline to ensure that the second clamping device can smoothly clamp the gas pipeline. The water tank 3 of this invention directly discharges the detection liquid into the circulation system. When the solution needs to be re-injected, the solution is filled into the water tank 3 through the circulation system.Furthermore, the circulation system includes a circulation hole in the water tank 3. The circulation hole, a storage tank 11, and a water pump 12 are connected via a circulation pipeline. The end of the water pump 12 is reconnected to the water tank 3 via the circulation pipeline. Specifically, the solution in the water tank 3 is connected to the storage tank 11 via the circulation hole. A filter screen 13 is fixed in the circulation hole to filter impurities and prevent them from entering the storage tank 11. The filter screen 13 can be cleaned after a period of time.

[0037] Furthermore, a filter screen 13 is fixedly connected to the circulation hole, and a fluorescence concentration detection sensor is installed inside the liquid storage tank 11. Specifically, the present invention installs a fluorescence concentration detection sensor inside the liquid storage tank 11, which can accurately detect when the concentration of the fluorescent liquid is insufficient, facilitating liquid replenishment.

[0038] Furthermore, the transmission assembly includes a fixed frame 14, on which a first horizontal slide rail 15 and a second horizontal slide rail 15 are fixedly mounted. The first clamping device 7 and the second clamping device 8 are respectively mounted on the first horizontal slide rail 15 and the second horizontal slide rail 15, and are located on both sides of the detection box 5. Specifically, the main body of the transmission assembly of the present invention is a fixed frame 14, on which horizontal slide rails 15 are fixed respectively, thus facilitating the movement of the two clamping devices on the horizontal slide rails 15. The horizontal slide rails are both linear guide rails, and the first clamping device and the second clamping device are both mounted on a mounting plate. A pen-shaped cylinder is fixed to the top of the mounting plate, and an electric gripper is slidably connected to the mounting plate via a guide rod. The electric gripper is fixed to the bottom of the pen-shaped cylinder, thereby achieving the clamping of the gas pipeline.

[0039] Furthermore, the drying component 4 is an annular air knife 9, which is fixed between the first horizontal slide rail 15 and the second horizontal slide rail 15.

[0040] A connecting beam is provided, and the annular air knife 9 is fixed on the connecting beam. Specifically, the air drying assembly 4 of the present invention uses an annular air knife 9, which is directly connected to the lower part of the connecting beam between the first horizontal slide rail 15 and the second horizontal slide rail 15, thus facilitating the smooth passage of the gas pipeline 10 through the annular air knife 9.

[0041] The present invention also includes a method of using a gas pipeline 10 airtightness testing device, comprising the following steps:

[0042] S1: Prepare the test solution, which contains a low concentration of fluorescent indicator, and inject the test solution into the storage tank 11;

[0043] S2: Place the gas pipeline 10 to be tested into the water tank 3 and seal both ends. Then, introduce the test liquid into the water tank 3 so that the surface of the gas pipeline 10 is submerged in the test liquid. Then, fill the gas pipeline 10 with high-pressure dry air and stabilize the pressure for a period of time so that bubbles are continuously generated at the leak point.

[0044] S3: Discharge the detection liquid into the storage tank 11, exposing the gas pipe. The bubbles in the leak area on the gas pipe 10 burst instantly, splashing the fluorescent agent around the leak. The gas pipe is then introduced into the drying assembly 4 for drying.

[0045] S4: The dried gas pipeline 10 is introduced into the closed detection box 5 for detection. When a dense yellow-green fluorescence appears on the terminal, the terminal automatically collects the image and issues an alarm to notify that there is a leak in the gas pipeline 10. At this time, the gas pipeline 10 is reworked or scrapped.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A gas pipeline gas tightness detection device characterized by, include: A mounting bracket, wherein a horizontally mounted mounting plate is fixed to the top of the mounting bracket; A water tank is fixedly connected to a mounting plate, and the water tank is connected to a circulation system containing a low concentration of fluorescent indicator. A drying assembly, wherein the drying assembly is fixed to the discharge side of the water tank; A testing box is fixedly mounted on the mounting plate. An ultraviolet LED lamp tube is installed in the testing box, and a vision inspection system is also provided in the testing box. A transmission assembly includes a first clamping device and a second clamping device. The first clamping device clamps the gas pipeline and sequentially feeds it into the drying assembly and the testing box. The second clamping device clamps the gas pipeline out of the testing box and transports it.

2. The gas pipeline airtightness testing device as described in claim 1, characterized in that, The circulation system includes a circulation hole in the water tank, the circulation hole, a liquid storage tank, and a water pump are connected through a circulation pipeline, and the end of the water pump is connected back to the water tank through the circulation pipeline.

3. The gas pipeline airtightness testing device as described in claim 2, characterized in that, A filter screen is fixedly connected to the circulation hole, and a fluorescence concentration detection sensor is installed inside the liquid storage tank.

4. The gas pipeline airtightness testing device as described in claim 3, characterized in that, The transmission assembly includes a fixed frame, on which a first horizontal slide rail and a second horizontal slide rail are fixedly installed. The first clamping device and the second clamping device are respectively installed on the first horizontal slide rail and the second horizontal slide rail, and are respectively located on both sides of the detection box.

5. The gas pipeline airtightness testing device as described in claim 4, characterized in that, The visual inspection system includes multiple sets of ultraviolet cameras, and the ultraviolet cameras are connected to a display terminal via signal connection.

6. The gas pipeline airtightness testing device as described in claim 5, characterized in that, The air-drying assembly is an annular air knife, and a connecting beam is fixed between the first horizontal slide rail and the second horizontal slide rail. The annular air knife is fixed on the connecting beam.

7. A method of using the gas pipeline airtightness testing device as described in claim 6, characterized in that, Includes the following steps: S1: Prepare the test solution, which contains a low concentration of fluorescent indicator, and inject the test solution into the storage tank; S2: Place the gas pipeline to be tested into the water tank and seal both ends. Then, introduce the test liquid into the water tank so that the surface of the gas pipeline is submerged in the test liquid. Fill the gas pipeline with high-pressure dry air and stabilize the pressure for a period of time so that bubbles are continuously generated at the leak point. S3: Quickly discharge the detection liquid into the storage tank, exposing the gas pipe. The bubbles in the leak area on the gas pipe burst instantly, splashing the fluorescent agent around the leak. Then, the gas pipe is passed into the drying assembly for drying. S4: After the gas pipeline has been dried, it is put into a closed testing chamber for testing. When a dense yellow-green fluorescence appears on the terminal, the terminal automatically collects the image and issues an alarm to notify that there is a leak in the gas pipeline. At this time, the gas pipeline is either reworked or scrapped.

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