A liquid penetration test block for a metallurgical composite pipeline and its detection process

Abstract

The present invention belongs to the technical field of liquid penetration test blocks for metallurgical composite pipelines, and specifically relates to a liquid penetration test block for metallurgical composite pipelines and its detection process. First, the liquid spraying mobile trolley approaches and drives outwards. The dust removal fan at the rear end is turned on. The trolley is filled with a water-washable penetrant, and the penetrant is sprayed on the inner wall of the pipeline through the trolley nozzle to form a dense and uniform penetrant film. After completion, the trolley returns to the origin. After standing still, the liquid spraying mobile trolley automatically resets. Then, the air blowing mobile trolley is driven to approach and drive outwards, and water is sprayed under the pressure of a pressure pump to remove the excess liquid penetrant on the surface. The removed penetrant is collected by a waste water tank. After completion, the trolley returns to the origin. By setting a scraping component, the problem that the inner diameter changes during the grinding process of the welding slag inside the pipeline is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid penetration test blocks for metallurgical composite pipes, and specifically relates to a liquid penetration test block for metallurgical composite pipes and its detection process. Background Art

[0002] The liquid penetration test block for metallurgical composite pipes is an application based on penetration testing technology. This technology utilizes the principle of capillary action. By applying a penetration liquid containing fluorescent or coloring dyes to the surface of the pipe, it detects its tiny defects. The test block, as a detection standard, has known defects and is used to monitor the performance of the penetration testing system.

[0003] The existing liquid penetration detection process for metallurgical composite pipes mainly includes steps such as pretreatment, penetration, cleaning, drying, imaging, and observation and recording. First, the metallurgical composite pipe is pretreated, such as degreasing, rust removal, and drying, to ensure the cleanliness of the detection surface. Then, the penetration liquid is applied to the surface of the pipe, and the penetration liquid can penetrate into tiny defects. Next, the excess penetration liquid is washed off and the surface of the pipe is dried. After that, the developer is applied, and the penetration liquid in the defects will be re-adsorbed onto the surface of the pipe, forming visible defect displays. Finally, under an appropriate light source, the shape, size, and position of the defects are observed and recorded to evaluate the quality and safety of the pipe. The entire detection process is easy to operate and has a high defect detection rate, which is an important means for quality detection of metallurgical composite pipes.

[0004] However, in the pretreatment cleaning process of the existing liquid penetration detection process for metallurgical composite pipes, due to welding slag adhering to the inner wall of the pipe, when these welding slags are polished and cleaned, since the diameter of the grinding wheel is usually smaller than the inner diameter of the pipe, the grinding tool cannot fully fit the inner wall of the pipe for uniform grinding. Therefore, during the grinding process, the edges of the welded joints are often over-ground. This not only fails to completely remove the welding slag but may also change the original size of the inner diameter of the pipe, causing a certain distance of concavity in the inner wall of the ground part of the pipe, resulting in a change in the inner diameter, affecting the uniform application and penetration of the penetration liquid, thereby reducing the accuracy and reliability of the penetration detection. In addition, it will also affect the fluid transportation efficiency of the pipe, may cause fluid turbulence and eddy currents, increase the energy consumption and wear of the pipe system, and even pose a threat to the overall structural strength and safety of the pipe.

[0005] Therefore, the present invention provides a liquid penetration test block for metallurgical composite pipes and its detection process. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art and solve at least one of the technical problems proposed in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A detection process for a liquid penetration test block of a metallurgical composite pipe according to the present invention includes the following steps:

[0008] Step 1. Pretreatment: Prepare five curved test blocks. Before use, the curved test blocks should be cleaned with acetone to remove the residual penetrant on the test blocks. Place them at the pipe nozzle, 1 / 4, and 1 / 2 positions, and then spray solvent water on the inner wall of the pipe for purging. After cleaning, purge and dry by spraying compressed air.

[0009] Step 2. Apply penetrant and remove penetrant: Move the trolley to spray penetrant on the inner wall of the pipe. After spraying, let it stand, and then start the water-spraying trolley to spray water on the inner wall of the pipe to remove the excess penetrant on the inner wall of the pipe.

[0010] Step 3. Apply developer and conduct endoscopic inspection: Move the trolley carrying the developer close to the pipe, spray the developer on the inner wall of the pipe, and after spraying, insert the endoscope into the pipe for inspection and determination.

[0011] Preferably, applying penetrant and removing penetrant are specifically as follows: First, move the liquid-spraying trolley close, drive it outwards, turn on the dust removal fan at the rear end. The trolley is filled with water-washable penetrant, and the penetrant is sprayed on the inner wall of the pipe through the trolley nozzle to form a dense and uniform penetrant film. After completion, the trolley returns to the origin. After standing, the liquid-spraying trolley automatically resets, and then drive the air-blowing trolley close, drive it outwards, and spray water under the pressure of the pressure pump to remove the excess liquid penetrant on the surface. The removed penetrant is collected by the waste water tank. After completion, the trolley returns to the origin.

[0012] Preferably, applying developer and conducting endoscopic inspection are specifically as follows: First, the type of developer applied is wet developer, which is pre-stored in the developer tank after being prepared. Then, drive the trolley close and drive it to the rear end of the pipe, move forward and backward. Pressurize the developer through the pump and evenly apply it on the inner wall through the nozzle. After completion, the trolley returns to the origin. After standing, drive the trolley with the endoscope close. The head of the trolley is equipped with a rotating head and a telescopic rod, and a white light lamp and a camera are placed at the front end of the telescopic rod to keep perpendicular to the inner wall, drive it outwards and rotate, take pictures and form images. The inner wall of the pipe is directly displayed on the display screen for easy inspection and determination, and the inspection results are automatically stored in the configured computer.

[0013] Preferably, the pretreatment is specifically as follows: First, drive the water-spraying trolley close to the pipe. After the trolley gets close to the pipe, spray solvent water into the pipe to remove the dust and grease attached to the inner wall of the pipe. Then, drive the welding slag detection trolley to conduct detection and clean and scrape the welding slag on the inner wall of the pipe. Finally, drive the drying trolley to purge the inner wall of the pipe to remove the residual moisture on the inner wall of the pipe.

[0014] Preferably, the specific cleaning process of the welding slag cart is as follows: drive the welding slag detection cart to move towards the inner wall of the pipeline to be tested. After the body of the welding slag detection cart abuts against the pipeline end, drive the telescopic rod to extend into the pipeline. During the extension process, the detection component at one end of the telescopic rod will detect the welding slag points on the inner wall of the pipeline. When several fixing plates arranged on one side of the fixing ring encounter welding slag, the welding slag squeezes the fixing plates, and the fixing plates squeeze the compression springs, causing the sliders at one end of the fixing plates to move along the scale grooves. The moving distance is the height of the welding slag. Then drive the scraping component to rise, and the rising distance is the same as the detected height, so that the scraping component can be closely attached to the inner wall of the pipeline for scraping work.

[0015] Preferably, a guiding block is fixedly connected to the end of the fixing plate away from the fixing ring. The guiding block is in an inclined state and can guide the welding slag to abut against and squeeze the fixing plate.

[0016] Preferably, the scraping component is specifically as follows: after detecting the position of the specific welding slag, start the motor on one side of the fixing ring, adjust the angle of the connecting guide rail to align with the position to be scraped, and then start the connecting guide rail. The connecting guide rail is an electric guide rail, so that the connecting block in the connecting groove slides along the connecting groove, driving the scraper at one end of the connecting rod to abut against the inner wall of the pipeline. Then drive the telescopic rod again to make the scraper scrape the welding slag.

[0017] Preferably, the cross-section of the scraper is the same as the arc-shaped inner wall of the pipeline. After it abuts against the inner wall of the pipeline, drive the scraper, and the blade at the end of the scraper scrapes and cleans the welding slag.

[0018] Preferably, during the upward movement of the connecting block, it can drive the auxiliary plate to move together. The movement of the auxiliary plate drives the piston rod to move along the piston tube, squeezing the water in the piston tube and spraying it onto the inner wall of the pipeline to cool the scraper during the scraping process and adsorb the generated welding slag dust at the same time.

[0019] Preferably, a liquid penetration test block for a metallurgical composite pipeline is used to conduct a penetration test block detection test.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. A liquid penetration test block and its detection process for a metallurgical composite pipeline according to the present invention. By driving a slag detection trolley to move towards the inner wall of the pipeline to be tested, when the trolley body is in close contact with the pipeline end, the built-in telescopic rod starts to extend into the pipeline. During this extension process, the detection component at one end of the telescopic rod will detect the inner wall of the pipeline and locate the position of the welding slag. At this time, multiple fixing plates arranged on one side of the fixing ring play a key role. Once encountering the welding slag, the welding slag will squeeze the fixing plate, and then through the elastic action of the compression spring, the slider at one end of the fixing plate will move along the scale groove. The distance of this movement exactly reflects the height of the welding slag, providing an accurate height for the subsequent scraping work. Next, the slag trolley will drive the scraping component to rise to the corresponding position according to the detected height of the welding slag, ensuring that the scraping component is in close contact with the inner wall of the pipeline, improving the accuracy of scraping, and effectively avoiding damage to the inner wall of the pipeline caused by excessive scraping. It not only realizes the accurate detection and efficient cleaning of the welding slag, but also effectively improves the cleanliness and safety of the inner wall of the pipeline, making the subsequent detection more accurate.

[0022] 2. A liquid penetration test block and its detection process for a metallurgical composite pipeline according to the present invention. When the specific position of the welding slag is detected, the motor on one side of the fixing ring will be started, and the angle of the connecting guide rail will be quickly adjusted to ensure that the scraper can accurately align with the position where the welding slag is located. Subsequently, the electric guide rail is activated, and the connecting block in the connecting groove slides along the preset path, driving the scraper at one end of the connecting rod to slowly contact the inner wall of the pipeline. The cross-section of the scraper matches the arc-shaped inner wall of the pipeline, ensuring a tight fit between the scraper and the inner wall of the pipeline, thereby improving the efficiency and accuracy of scraping. When the scraper is in close contact with the inner wall of the pipeline, the telescopic rod is driven again to push the scraper to move along the inner wall of the pipeline, and the blade at the end of the scraper starts to scrape and clean the welding slag. It not only realizes the accurate positioning and efficient cleaning of the welding slag, but also the arc-shaped scraper reduces the potential damage to the inner wall of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Figure 1 is a perspective view of Embodiment 1 of the present invention;

[0025] Figure 2 is a schematic structural view of the scraping component of the present invention;

[0026] Figure 3 is a schematic structural view of the piston tube of the present invention;

[0027] Figure 4 is a sectional view of the piston tube of the present invention;

[0028] Figure 5 is a schematic structural view of the fixing ring of the present invention;

[0029] Figure 6 It is a schematic structural diagram of the fixing plate of the present invention;

[0030] Figure 7 It is the present invention Figure 6 An enlarged view of part A in it.

[0031] In the figure: 1, the body; 2, the telescopic rod;

[0032] 3, the fixing ring; 31, the fixing groove; 32, the fixing plate; 33, the guiding block; 34, the scale groove; 35, the slider; 36, the telescopic column; 37, the compression spring;

[0033] 4, the motor; 41, the fixed shaft; 42, the connecting guide rail; 43, the connecting groove; 44, the connecting block; 45, the connecting rod; 46, the scraper; 47, the auxiliary plate; 48, the piston column; 49, the storage tank; 410, the top plate; 411, the piston tube; 412, the auxiliary tube; 413, the limiting plate; 414, the spray hole. Specific embodiments

[0034] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments. Embodiment 1

[0035] As Figures 1 to 7 shown, a liquid penetration test block detection process for a metallurgical composite pipeline according to an embodiment of the present invention includes the following steps:

[0036] Step 1, pretreatment: Prepare five curved test blocks. Before use, the curved test blocks should be cleaned with acetone to remove the residual penetrant on the test blocks, and placed at the pipe orifice, 1 / 4, and 1 / 2 of the pipe. Then, spray solvent water on the inner wall of the pipe for purging. After cleaning, purge and dry by spraying compressed air.

[0037] Step 2, applying penetrant and removing penetrant: Move the trolley to spray penetrant on the inner wall of the pipe. After spraying, let it stand, and then start the water spraying trolley to spray water on the inner wall of the pipe to remove the excess penetrant on the inner wall of the pipe.

[0038] Step 3, applying developer and endoscopic inspection: Move the trolley carrying the developer close to the pipe, spray the developer on the inner wall of the pipe. After spraying, insert the endoscope into the pipe for inspection and determination.

[0039] In this embodiment, the application of penetrant and the removal of penetrant are specifically as follows: First, the liquid spraying mobile cart approaches, drives outwards, and the dust removal fan at the rear end is turned on. The cart is filled with water-washable penetrant, and the penetrant is sprayed on the inner wall of the pipeline through the cart nozzle to form a dense and uniform penetrant film. After completion, the cart returns to the origin. After standing still, the liquid spraying mobile cart automatically resets. Then, the air blowing mobile cart is driven to approach and drive outwards, and under the pressure of the pressure pump, water is sprayed to remove the excess liquid penetrant on the surface. The removed penetrant is collected by the waste water tank. After completion, the cart returns to the origin;

[0040] In this embodiment, the application of developer and the endoscope inspection are specifically as follows: First, the type of developer applied is wet developer, which is pre-stored in the developer tank after being prepared. Then, the mobile cart is driven to approach and move to the rear end of the pipeline, move backward and forward, and the developer is evenly applied on the inner wall through the nozzle by the pressure of the pump. After completion, the cart returns to the origin. After standing still, the cart with an endoscope is driven to approach. The head of the cart is equipped with a rotating head and a telescopic rod 2, and the white light lamp and the camera are placed at the front end of the telescopic rod 2 to keep perpendicular to the inner wall, drive outwards and rotate, take pictures and form images, and the inner wall of the pipeline is directly displayed on the display screen for easy inspection and judgment. The inspection results are automatically stored on the configured computer.

[0041] As Figure 1 shown, the pretreatment in this embodiment is specifically as follows: First, the water spraying mobile cart is driven to approach the pipeline. After the mobile cart approaches the pipeline, solvent water is sprayed into the pipeline to remove the dust and grease attached to the inner wall of the pipeline. Then, the welding slag detection cart is driven for detection to clean and scrape the welding slag on the inner wall of the pipeline. Finally, the drying cart is driven to blow the inner wall of the pipeline to remove the residual moisture on the inner wall of the pipeline.

[0042] Specifically, first, the mobile cart is used to approach the pipeline and spray solvent water to effectively remove the dust and grease attached to the inner wall of the pipeline; subsequently, the welding slag detection cart conducts precise detection and thoroughly cleans and scrapes the welding slag to ensure that the inner wall of the pipeline is smooth and flawless; finally, the drying cart blows the pipeline to remove the residual moisture and keep the inner wall of the pipeline dry, which can comprehensively and efficiently clean the inner wall of the pipeline and improve the accuracy of detection.

[0043] As Figures 2 to 4As shown in the figure, the specific cleaning process of the slag removal trolley in this embodiment is as follows: By driving the slag detection trolley, it moves towards the inner wall of the pipeline to be tested. When the body 1 of the slag detection trolley abuts against the end of the pipeline, the telescopic rod 2 is driven to extend into the pipeline. During the extension process, the detection component at one end of the telescopic rod 2 will detect the inner wall of the pipeline for slag points. When several fixing plates 32 arranged on one side of the fixing ring 3 encounter slag, the slag squeezes the fixing plates 32, and the fixing plates 32 squeeze the compression spring 37, causing the slider 35 at one end of the fixing plates 32 to move along the scale groove 34. The moving distance is the height of the slag. Then, the scraping component is driven to rise, and the rising distance is the same as the detected height, so that the scraping component can closely adhere to the inner wall of the pipeline for scraping work.

[0044] Specifically, by driving the slag detection trolley to move towards the inner wall of the pipeline to be tested, when the body 1 of the trolley is in close contact with the end of the pipeline, the built-in telescopic rod 2 starts to extend into the pipeline. During this extension process, the detection component at one end of the telescopic rod 2 will detect the inner wall of the pipeline to locate the position of the slag. At this time, the multiple fixing plates 32 arranged on one side of the fixing ring 3 play a key role. Once encountering slag, the slag will squeeze the fixing plates 32, and then through the elastic action of the compression spring 37, the slider 35 at one end of the fixing plates 32 is caused to move along the scale groove 34. This moving distance exactly reflects the height of the slag, providing an accurate height for the subsequent scraping work. Next, the slag removal trolley will drive the scraping component to rise to the corresponding position according to the detected height of the slag, ensuring that the scraping component is closely attached to the inner wall of the pipeline, improving the accuracy of scraping, and effectively avoiding damage to the inner wall of the pipeline caused by excessive scraping. It not only realizes the precise detection and efficient cleaning of slag, but also effectively improves the cleanliness and safety of the inner wall of the pipeline, making the subsequent detection more accurate.

[0045] As Figure 6 shown in the figure, a guiding block 33 is fixedly connected to the end of the fixing plate 32 away from the fixing ring 3. The guiding block 33 is in an inclined state and can guide the slag to abut against and squeeze the fixing plate 32. Embodiment Two

[0046] As Figures 1 to 7 shown in the figure, compared with Embodiment One, another implementation manner of the present invention is as follows: The scraping component is specifically as follows. After detecting the position of the specific slag, the motor 4 on one side of the fixing ring 3 is started to adjust the angle of the connecting guide rail 42 to align with the position to be scraped. Then, the connecting guide rail 42 is started. The connecting guide rail 42 is an electric guide rail, so that the connecting block 44 in the connecting groove 43 slides along the connecting groove 43, driving the scraping plate 46 at one end of the connecting rod 45 to abut against the inner wall of the pipeline. The telescopic rod 2 is driven again, so that the scraping plate 46 scrapes the slag. The cross-section of the scraping plate 46 is the same as the arc-shaped inner wall of the pipeline. After it abuts against the inner wall of the pipeline, the scraping plate 46 is driven, and the blade at the end of the scraping plate 46 scrapes and cleans the slag.

[0047] Specifically, when the specific position of the welding slag is detected, the motor 4 on one side of the fixing ring 3 will start, quickly adjust the angle of the connecting guide rail 42 to ensure that the scraper 46 can accurately align with the position where the welding slag is located. Subsequently, the electric guide rail is activated, and the connecting block 44 in the connecting groove 43 slides along the preset path, driving the scraper 46 at one end of the connecting rod 45 to slowly contact the inner wall of the pipeline. The cross-section of the scraper 46 matches the arc-shaped inner wall of the pipeline, ensuring a tight fit between the scraper 46 and the inner wall of the pipeline, thereby improving the scraping efficiency and accuracy. When the scraper 46 is in close contact with the inner wall of the pipeline, the telescopic rod 2 is driven again to push the scraper 46 to move along the inner wall of the pipeline, and the blade at the end of the scraper 46 starts to scrape and clean the welding slag. This not only achieves the precise positioning and efficient cleaning of the welding slag, but also the arc-shaped scraper 46 reduces the potential damage to the inner wall of the pipeline.

[0048] As Figure 4 shown, during the upward movement of the connecting block 44 in this embodiment, the auxiliary plate 47 can be driven to move together. The movement of the auxiliary plate 47 drives the piston column 48 to move along the piston tube 411, squeezing the water in the piston tube 411 and spraying it onto the inner wall of the pipeline to cool the scraper 46 during the scraping process and adsorb the generated welding slag dust.

[0049] Specifically, during the operation of the scraping component, when the connecting block 44 moves upward, it drives the auxiliary plate 47 to move synchronously, which can drive the piston column 48 to slide in the piston tube 411, thereby squeezing the water in the tube to form a water mist and spraying it onto the inner wall of the pipeline. This effectively reduces the high temperature generated by the scraper 46 when scraping the welding slag and prevents thermal damage to the inner wall of the pipeline. At the same time, the sprayed water mist can also adsorb and carry away the welding slag dust generated during the scraping process, ensuring the cleanliness of the inner wall of the pipeline. This not only improves the scraping efficiency, but also effectively protects the inner wall of the pipeline, enhancing the safety and reliability of the pipeline pretreatment work.

[0050] Working principle. First, a mobile trolley is used to approach the pipeline and spray solvent water to effectively remove the dust and grease adhering to the inner wall of the pipeline. Subsequently, a welding slag detection trolley conducts precise detection. By driving the welding slag detection trolley to move towards the inner wall of the pipeline to be tested, when the trolley body 1 is in close contact with the pipeline end, the built-in telescopic rod 2 starts to extend into the pipeline. During this extension process, the detection component at one end of the telescopic rod 2 detects the inner wall of the pipeline to locate the position of the welding slag. At this time, the multiple fixing plates 32 provided on one side of the fixing ring 3 play a key role. Once encountering welding slag, the welding slag will squeeze the fixing plate 32, and then through the elastic action of the compression spring 37, the slider 35 at one end of the fixing plate 32 moves along the scale groove 34. The distance of this movement exactly reflects the height of the welding slag, providing an accurate height for the subsequent scraping work. Next, the welding slag trolley will drive the scraping component to rise to the corresponding position according to the detected height of the welding slag, ensuring that the scraping component is in close contact with the inner wall of the pipeline, improving the accuracy of scraping, and effectively avoiding damage to the inner wall of the pipeline caused by excessive scraping. It not only realizes the precise detection and efficient cleaning of welding slag, but also effectively improves the cleanliness and safety of the inner wall of the pipeline, making the subsequent detection more accurate;

[0051] When the specific position of the welding slag is detected, the motor 4 on one side of the fixing ring 3 will be started to quickly adjust the angle of the connecting guide rail 42 to ensure that the scraping plate 46 can accurately align with the position where the welding slag is located. Subsequently, the electric guide rail is activated, and the connecting block 44 in the connecting groove 43 slides along the preset path, driving the scraping plate 46 at one end of the connecting rod 45 to slowly contact the inner wall of the pipeline. The cross-section of the scraping plate 46 matches the arc-shaped inner wall of the pipeline, ensuring a tight fit between the scraping plate 46 and the inner wall of the pipeline, thereby improving the efficiency and accuracy of scraping. When the scraping plate 46 is in close contact with the inner wall of the pipeline, the telescopic rod 2 is driven again to push the scraping plate 46 to move along the inner wall of the pipeline, and the blade at the end of the scraping plate 46 starts to scrape and clean the welding slag. It not only realizes the precise positioning and efficient cleaning of the welding slag, but also the arc-shaped scraping plate 46 reduces the potential damage to the inner wall of the pipeline;

[0052] In addition, during the operation of the scraping component, when the connecting block 44 moves upward, it drives the auxiliary plate 47 to move synchronously, which can drive the piston column 48 to slide in the piston tube 411, and then squeeze the water in the tube to form a water mist sprayed onto the inner wall of the pipeline, effectively reducing the high temperature generated when the scraping plate 46 scrapes the welding slag, preventing thermal damage to the inner wall of the pipeline. At the same time, the sprayed water mist can also adsorb and carry away the welding slag dust generated during the scraping process, ensuring the cleanliness of the inner wall of the pipeline, not only improving the scraping efficiency, but also effectively protecting the inner wall of the pipeline, enhancing the safety and reliability of the pipeline pretreatment work,

[0053] After thoroughly cleaning and scraping the welding slag to ensure that the inner wall of the pipeline is smooth and flawless, the drying trolley purges the pipeline to remove the residual moisture and keep the inner wall of the pipeline dry, which can comprehensively and efficiently clean the inner wall of the pipeline and improve the accuracy of detection.

[0054] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid penetration test block detection process for a metallurgical composite pipeline, characterized in that: Specifically, it includes the following steps: Step 1. Pretreatment: Prepare five curved test blocks. Before use, the curved test blocks should be cleaned with acetone to remove the residual penetrant on the test blocks, and then placed at the pipe orifice, 1 / 4, and 1 / 2 positions of the pipe. Then, spray solvent water into the inner wall of the pipe for purging. After the cleaning is completed, purge and dry by spraying compressed air. The pretreatment is specifically as follows: First, drive the water-spraying mobile cart close to the pipe. After the mobile cart approaches the pipe, spray solvent water into the pipe to remove the dust and grease adhering to the inner wall of the pipe. Then, drive the welding slag detection cart for detection to clean and scrape the welding slag on the inner wall of the pipe. Finally, drive the drying cart to purge the inner wall of the pipe to remove the residual moisture on the inner wall of the pipe. The specific cleaning process of the welding slag cart is as follows: Drive the welding slag detection cart to move towards the inner wall of the pipe to be tested. When the body (1) of the welding slag detection cart abuts against the pipe end, drive the telescopic rod (2) to penetrate into the pipe. During the penetration process, the detection component at one end of the telescopic rod (2) will detect the welding slag points on the inner wall of the pipe. When several fixing plates (32) provided on one side of the fixing ring (3) encounter welding slag, the welding slag squeezes the fixing plates (32), and the fixing plates (32) squeeze the compression spring (37), causing the slider (35) at one end of the fixing plate (32) to move along the scale groove (34). The moving distance is the height of the welding slag. Then, drive the scraping component to rise, and the rising distance is the same as the detected height, so that the scraping component can be closely attached to the inner wall of the pipe for scraping work. Step 2. Apply penetrant and remove penetrant: The mobile cart sprays penetrant onto the inner wall of the pipe. After spraying, let it stand, and then start the water-spraying cart to spray water onto the inner wall of the pipe to remove the excess penetrant on the inner wall of the pipe. Step 3. Apply developer and conduct endoscopic inspection: Drive the mobile cart carrying the developer close to the pipe, spray the developer onto the inner wall of the pipe. After spraying, insert the endoscope into the pipe for inspection and determination. A guiding block (33) is fixedly connected to the end of the fixing plate (32) far from the fixing ring (3). The guiding block (33) is in an inclined state and can guide the welding slag to abut against and squeeze the fixing plate (32). When the position of the specific welding slag is detected, start the motor (4) on one side of the fixing ring (3) to adjust the angle of the connecting guide rail (42) to align with the position to be scraped. Start the connecting guide rail (42) to make the connecting block (44) in the connecting groove (43) slide along the connecting groove (43), driving the scraper (46) at one end of the connecting rod (45) to abut against the inner wall of the pipe. Then, drive the telescopic rod (2) again to make the scraper (46) scrape the welding slag. During the upward movement of the connecting block (44), it drives the auxiliary plate (47) to move together. The movement of the auxiliary plate (47) drives the piston rod (48) to move along the piston tube (411), squeezing the water in the piston tube (411) and spraying it onto the inner wall of the pipe to cool the scraper (46) during the scraping process and adsorb the generated welding slag dust at the same time.

2. The liquid penetration test block detection process for a metallurgical composite pipeline according to claim 1, wherein: The application of penetrant and the removal of penetrant are specifically as follows: First, the liquid spraying mobile trolley moves closer, drives outwards, and the dust removal fan at the rear end is turned on. The trolley is filled with water-washable penetrant, and the penetrant is sprayed on the inner wall of the pipeline through the trolley nozzle to form a dense and uniform penetrant film. After completion, the trolley returns to the origin. After standing still, the liquid spraying mobile trolley automatically resets. Then, the air blowing mobile trolley is driven closer and drives outwards, and water is sprayed under the pressure of the pressure pump to remove the excess liquid penetrant on the surface. The removed penetrant is collected by the waste water tank. After completion, the trolley returns to the origin.

3. The liquid penetration test block detection process for a metallurgical composite pipeline according to claim 1, characterized in that: The application of developer and endoscopic inspection are specifically as follows: First, the type of developer applied is wet developer, which is pre-stored in the developer tank after being prepared. Then, the mobile trolley is driven closer and moved to the rear end of the pipeline, moving backward and forward. The developer liquid is evenly applied to the inner wall through the nozzle under the pressure of the pump. After completion, the trolley returns to the origin. After standing still, the trolley with an endoscope is driven closer. The head of the trolley is equipped with a rotating head and a telescopic rod (2), and a white light lamp and a camera are placed at the front end of the telescopic rod (2) to keep perpendicular to the inner wall. It drives outwards and rotates to take images. The inner wall of the pipeline is directly displayed on the display screen for easy inspection and determination. The inspection results are automatically stored in the configured computer.

4. A liquid penetration test block detection process for a metallurgical composite pipeline according to claim 1, characterized in that: The cross-section of the scraper (46) is the same as the arc-shaped inner wall of the pipeline. After it abuts against the inner wall of the pipeline, the scraper (46) is driven, and the blade at the end of the scraper (46) scrapes and cleans the welding slag.

5. A liquid penetration test block for a metallurgical composite pipe, characterized in that: It is applied to the liquid penetrant test block detection process of a metallurgical composite pipeline described in any one of claims 1-4 to conduct penetrant test block detection and testing.

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