Pressure sharing mechanism for nondestructive testing of inner wall of steel pipe

Abstract

This application relates to a pressure-sharing mechanism for non-destructive testing of the inner wall of steel pipes, and pertains to the technical field of non-destructive testing of steel pipes. It includes a storage tank and an oil-free compressor body. Electric push rods are installed on both sides of the storage tank. The tops of the two sets of electric push rods are fixedly connected to the same frame. Lead screws are installed on the opposite inner walls of the frame via rotating shafts. Threaded blocks are threaded onto the surface of the lead screws. By linking the storage tank, the oil-free compressor body, the drive motor, and the electric push rods, and using a single oil-free compressor body as a pressure source, pressure is supplied to three liquids in the storage tank—permeate, water, and developer—through switching and docking with three sets of connecting pipes via a flexible conduit. Compared to existing solutions with multiple independent pressure sources, this structure reduces equipment costs and space occupation. Simultaneously, the linkage of the electric push rods, lead screws, and threaded blocks enables precise movement of the flexible conduit between different connecting pipes.

Description

Technical Field

[0001] This application relates to non-destructive testing of steel pipes, and in particular to a pressure-sharing mechanism for non-destructive testing of the inner wall of steel pipes. Background Technology

[0002] Non-destructive testing (NDT) of steel pipe inner walls refers to the technology of detecting defects such as cracks, porosity, and inclusions on the inner wall of steel pipes without damaging the pipe's structure. Its core principle is to utilize the interaction between the defect and media such as penetrating fluids, ultrasonic waves, and magnetic particles to transform invisible internal defects into visible signals, thereby assessing the quality and safety of the steel pipe.

[0003] In the field of non-destructive testing of steel pipe inner walls, multiple liquids such as penetrant, water, and developer are typically used to complete operations such as spraying and cleaning. The current mainstream technical solution in the industry is to use multiple independent pressure sources to provide pressure for different liquids to achieve the flaw detection operation on the inner wall of the steel pipe. The specific implementation method of the existing technology is as follows: multiple pressure sources are connected to penetrant storage tanks, water storage tanks, and developer storage tanks respectively. The pressure of each pressure source is individually adjusted to drive the spraying or transportation of the corresponding liquid.

[0004] This approach suffers from high equipment costs, and the pressure regulation and matching between multiple pressure sources are also difficult, easily leading to unstable liquid supply and affecting the accuracy and efficiency of flaw detection. As steel pipe non-destructive testing technology develops towards higher efficiency and integration, the current scheme of using multiple independent pressure sources to drive the permeate, water, and developer separately is gradually showing limitations in terms of cost control, space utilization, and ease of operation. Therefore, this solution proposes a technical approach that uses a single pressure source to provide pressure for the supply of the three liquids, thus solving the above problems. Utility Model Content

[0005] The purpose of this application is to provide a pressure-sharing mechanism for non-destructive testing of the inner wall of steel pipes, which has the advantage of low equipment cost and solves the problem of high cost of three independent pressure sources.

[0006] The pressure-sharing mechanism for non-destructive testing of the inner wall of steel pipes provided in this application adopts the following technical solution: it includes a storage tank and an oil-free compressor body. Electric push rods are provided on both sides of the storage tank. The tops of the two sets of electric push rods are fixedly connected to the same frame. A lead screw is provided on the opposite inner wall of the frame via a rotating shaft. A threaded block is threaded onto the surface of the lead screw, and a connecting rod is fixedly connected to the surface of the threaded block. A drive motor is provided on one side of the frame. The other end of the output shaft of the drive motor is fixedly connected to the other end of the lead screw via a rotating shaft. An exhaust pipe is provided on the surface of the oil-free compressor body. A flexible conduit is provided at the other end of the exhaust pipe via a flange. Three sets of connecting pipes are provided on the top of the storage tank. The other end of the flexible conduit is located inside the connecting pipe. Two sets of grooves are provided on both sides of the inner wall of the storage tank. A partition is provided in each of the two sets of grooves. Three sets of spray pipes are fixedly connected to the surface of the storage tank near the bottom. A solenoid valve is provided on the surface of each of the three sets of spray pipes.

[0007] By adopting the above technical solution, and by setting up a storage tank, an oil-free compressor body, and a drive motor and electric actuator in tandem, a single oil-free compressor body is used as a pressure source. Through the switching and docking of a flexible conduit with three sets of connecting pipes, pressure is supplied to three liquids in the storage tank: permeate, water, and developer. Compared to existing solutions with multiple independent pressure sources, this structure reduces equipment costs and space occupation. Furthermore, the linkage of the electric actuator, lead screw, and threaded block enables precise movement of the flexible conduit between different connecting pipes, ensuring efficient sharing of pressure sources and solving problems such as difficulty in matching multiple pressure sources and high costs associated with multiple pressure sources.

[0008] Preferably, the top and bottom of the inner wall of the frame are provided with sliding grooves, and a slider is slidably connected in the sliding groove, and the slider is fixedly connected to one side of the threaded block.

[0009] By adopting the above technical solution, the sliding groove and slider structure set on the inner wall of the frame, through the fixed connection between the slider and the threaded block, can limit the movement of the threaded block, making the movement of the threaded block more stable.

[0010] Preferably, the inner wall of the connecting tube and the surface of the flexible conduit are both provided with sealing rings, and a filter plate is provided inside the connecting tube.

[0011] By adopting the above technical solution, the sealing rings on the inner wall of the connecting pipe and the surface of the flexible conduit can enhance the sealing at the interface, prevent compressed air leakage, and ensure stable pressure transmission. The filter plate inside the connecting pipe can intercept impurities in the compressed air and prevent impurities from entering the storage tank and contaminating the liquid.

[0012] Preferably, a sealing strip is provided in both sets of grooves, and the sealing strip is made of rubber.

[0013] By adopting the above technical solution, the rubber sealing strip in the groove can enhance the sealing between the partition and the inner wall of the storage tank, divide the storage tank into three independent chambers, prevent the three liquids from mixing under pressure, and ensure that the liquids in each chamber are stored independently.

[0014] Preferably, a support plate is provided between the oil-free compressor body and the storage tank, and a collection box is provided on one side of the storage tank.

[0015] By adopting the above technical solution, the support plate can stabilize the relative position of the oil-free compressor body and the storage box, reduce the vibration during equipment operation, and the collection box is used to place the cover plate of the connecting pipe.

[0016] Preferably, the inner wall of the three sets of spray pipes is provided with a main plate, a spring is provided on one side of the main plate, and a piston head is fixedly connected to the other end of the spring. The inner wall of each of the three sets of spray pipes is provided with a ring body, and the piston head is adapted to the ring body.

[0017] By adopting the above technical solution, the main board, spring and piston head structure inside the spray pipe can form a unidirectional flow effect through the matching relationship between the piston head and the ring body, which can prevent liquid backflow after the flushing is completed.

[0018] Preferably, the back of the storage box has multiple sets of observation windows, and the surface of each of the three sets of observation windows is provided with a scale.

[0019] By adopting the above technical solution, the observation window and scale on the back of the storage box can intuitively display the liquid level in each chamber, which makes it convenient for operators to monitor the liquid level in real time, replenish it in time, and avoid interruption of the flaw detection process due to insufficient liquid.

[0020] Preferably, a fixing plate is fixedly connected to the bottom of the storage box near the four corners, and a base plate is provided at the bottom of the fixing plate, and studs are provided on the surface of the base plate.

[0021] By adopting the above technical solution, the fixing plate, base plate and stud structure at the bottom of the storage box can achieve stable installation of the equipment. The studs fix the equipment to the ground or workbench, reducing displacement during operation.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] This pressure-sharing mechanism for non-destructive testing of steel pipe inner walls utilizes a storage tank, an oil-free compressor body, a drive motor, and an electric actuator in a coordinated manner. A single oil-free compressor body serves as the pressure source, and pressure is supplied to three liquids—permeate, water, and developer—within the storage tank through the switching and docking of a flexible conduit with three sets of connecting pipes. Compared to existing solutions using multiple independent pressure sources, this structure reduces equipment costs and space requirements. Furthermore, the coordinated movement of the electric actuator, lead screw, and threaded block enables precise movement of the flexible conduit between different connecting pipes, ensuring efficient pressure source sharing and resolving issues such as difficulties in matching multiple pressure sources and the high cost of multiple pressure sources. Attached Figure Description

[0024] Figure 1 This is a schematic side sectional view of the structure of this application;

[0025] Figure 2 This is a rear view diagram of the structure of this application;

[0026] Figure 3 This is a side view of the connecting pipe structure of this application;

[0027] Figure 4 for Figure 1 Enlarged structural diagram at point A in the middle;

[0028] Figure 5 for Figure 1 Enlarged structural diagram at point B;

[0029] Figure 6 This is a top view of the storage box structure of this application.

[0030] In the diagram: 1. Storage tank; 2. Oil-free compressor body; 3. Exhaust pipe; 4. Flange; 5. Flexible conduit; 6. Solenoid valve; 7. Injection pipe; 8. Support plate; 9. Drive motor; 10. Collection tank; 11. Observation window; 12. Scale; 13. Connecting pipe; 14. Filter plate; 15. Sealing ring; 16. Electric push rod; 17. Threaded block; 18. Lead screw; 19. Connecting rod; 20. Slide groove; 21. Slider; 22. Main board; 23. Spring; 24. Piston head; 25. Ring body; 26. Sealing strip; 27. Partition plate; 28. Groove; 29. ​​Fixing plate; 30. Base plate; 31. Stud; 32. Frame. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 This application will be described in further detail below.

[0032] Example 1: Pressure sharing mechanism for non-destructive testing of the inner wall of steel pipes, refer to Figure 1 , Figure 4 and Figure 6The system includes a storage tank 1 and an oil-free compressor body 2. Electric push rods 16 are installed on both sides of the storage tank 1. The tops of the two sets of electric push rods 16 are fixedly connected to the same frame 32. Lead screws 18 are installed on the inner walls of the frame 32 via a rotating shaft. Threaded blocks 17 are threaded onto the surface of the lead screws 18, and connecting rods 19 are fixedly connected to the surface of the threaded blocks 17. A drive motor 9 is installed on one side of the frame 32. The other end of the output shaft of the drive motor 9 is fixedly connected to the other end of the lead screw 18 via a rotating shaft. An exhaust pipe 3 is opened on the surface of the oil-free compressor body 2. A flexible conduit 5 is installed at the other end of the exhaust pipe 3 via a flange 4. The top of the storage tank 1... Three sets of connecting pipes 13 are provided, with the other end of the flexible conduit 5 placed inside the connecting pipe 13. Two sets of grooves 28 are provided on both sides of the inner wall of the storage tank 1, and a partition 27 is provided in each of the two sets of grooves 28. Three sets of spray pipes 7 are fixedly connected to the surface of the storage tank 1 near the bottom, and a solenoid valve 6 is provided on the surface of each of the three sets of spray pipes 7. By setting up the storage tank 1, the oil-free compressor body 2, the drive motor 9, and the electric push rod 16 in linkage, the single oil-free compressor body 2 is used as a pressure source. Through the switching and docking of the flexible conduit 5 with the three sets of connecting pipes 13, the pressure supply of three liquids in the storage tank 1—permeate, water, and developer—is realized. Compared with the existing technology of multiple independent pressure sources, this structure can reduce equipment costs and space occupation. At the same time, through the linkage of the electric push rod 16, the lead screw 18, and the threaded block 17, the flexible conduit 5 can move precisely between different connecting pipes 13, ensuring efficient sharing of pressure sources and solving the problems of difficulty in matching multiple pressure sources and high cost of multiple pressure sources.

[0033] Example 2: Pressure sharing mechanism for non-destructive testing of the inner wall of steel pipes, refer to Figure 3 , Figure 4 ,and Figure 6 The inner wall of frame 32 has grooves 20 at the top and bottom, with sliders 21 slidably connected within the grooves 20. Slider 21 is fixedly connected to one side of threaded block 17. Sealing rings 15 are provided on the inner wall of connecting pipe 13 and the surface of flexible conduit 5. A filter plate 14 is installed inside connecting pipe 13. Sealing strips 26, made of rubber, are provided in both sets of grooves 28. The grooves 20 and sliders 21 on the inner wall of frame 32, through the fixed connection between slider 21 and threaded block 17, can limit the movement of threaded block 17. The threaded block 17 can move more stably. The sealing ring 15 between the inner wall of the connecting pipe 13 and the surface of the flexible conduit 5 can enhance the sealing at the interface, prevent compressed air leakage, and ensure stable pressure transmission. The filter plate 14 inside the connecting pipe 13 can intercept impurities in the compressed air, preventing impurities from entering the storage tank 1 and contaminating the liquid. The rubber sealing strip 26 in the groove 28 can enhance the sealing between the partition 27 and the inner wall of the storage tank 1, dividing the storage tank 1 into three independent chambers, preventing the three liquids from mixing under pressure, and ensuring that the liquid in each chamber is stored independently.

[0034] Example 3: Pressure sharing mechanism for non-destructive testing of the inner wall of steel pipes, refer to Figure 1 , Figure 2 and Figure 5 A support plate 8 is provided between the oil-free compressor body 2 and the storage tank 1. A collection box 10 is provided on one side of the storage tank 1. A main plate 22 is provided on the inner wall of the three sets of injection pipes 7. A spring 23 is provided on one side of the main plate 22. A piston head 24 is fixedly connected to the other end of the spring 23. A ring body 25 is provided on the inner wall of each of the three sets of injection pipes 7. The piston head 24 is adapted to the ring body 25. Multiple observation windows 11 are provided on the back of the storage tank 1. A scale 12 is provided on the surface of each of the three sets of observation windows 11. A fixing plate 29 is fixedly connected to the bottom of the storage tank 1 near the four corners. A base plate 30 is provided at the bottom of the fixing plate 29. A stud 31 is provided on the surface of the base plate 30. The support plate 8 can stabilize the oil-free compressor body 2 and the storage tank 1. The relative position of the storage tank 1 reduces vibration during equipment operation. The collection tank 10 is used to place the cover plate of the connecting pipe 13. The main plate 22, spring 23 and piston head 24 structure inside the spray pipe 7 can form a unidirectional flow effect through the matching relationship between the piston head 24 and the ring body 25. After flushing, it can prevent liquid backflow. The observation window 11 and scale 12 on the back of the storage tank 1 can intuitively display the liquid storage in each chamber, which is convenient for operators to monitor the liquid level in real time and replenish it in time to avoid interruption of the flaw detection process due to insufficient liquid. The fixing plate 29, base plate 30 and stud 31 structure at the bottom of the storage tank 1 can realize the stable installation of the equipment. It is fixed to the ground or workbench by the stud 31, reducing displacement during equipment operation.

[0035] The implementation principle of this application embodiment is as follows: Before use, the storage box 1 needs to be fixed to a flat surface by the bottom fixing plate 29, the bottom plate 30 and the studs 31 to ensure stability. The oil-free compressor body 2 is fixed to the storage box 1 by the support plate 8 and the exhaust pipe 3 is connected to the flexible conduit 5 through the flange 4. Attention should be paid to the integrity of the sealing ring 15 at the interface. Then, the cover plates of the three sets of connecting pipes 13 are opened, and the permeating liquid, clean water and developer are injected into the three chambers separated by the partition plate 27 and the rubber sealing strip 26 through the three sets of connecting pipes 13 respectively. The storage volume is confirmed to be no less than half of the chamber volume by the observation window 11 on the back and the scale 12. Finally, the power supply of the drive motor 9, the electric push rod 16 and the solenoid valve 6 is turned on. After the oil-free compressor is started, the compressed air flows through the exhaust pipe 3 The flexible conduit 5 enters through flange 4. The drive motor 9 drives the lead screw 18 to rotate, causing the threaded block 17 to move along the slide groove 20. Through the connecting rod 19, the flexible conduit 5 is connected to the target connecting pipe 13. At the same time, the electric push rod 16 finely adjusts the height of the frame 32 to ensure that the flexible conduit 5 and the sealing ring 15 on the inner wall of the connecting pipe 13 are tightly fitted. When switching liquids, the current solenoid valve 6 is closed first, and then the drive motor 9 is reversed to move the flexible conduit 5 to the next connecting pipe 13. During spraying, after docking, the corresponding solenoid valve 6 is opened. The oilless compressor outputs pressure to drive the liquid to be sprayed out through the spray pipe 7. At this time, the piston head 24 compresses the spring 23 and the ring body 25 under the action of air pressure to form a passage. After completion, the solenoid valve 6 is closed, and the spring 23 resets and seals the spray pipe 7 to prevent backflow.

[0036] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pressure sharing mechanism for non-destructive testing of the inner wall of a steel pipe, comprising a storage tank (1) and an oil-free compressor body (2), characterized in that: Both sides of the storage box (1) are provided with electric push rods (16), and the top of the two sets of electric push rods (16) are fixedly connected to the same frame (32). The inner walls of the frame (32) are provided with lead screws (18) through a rotating shaft. The surface of the lead screw (18) is threaded with a threaded block (17), and the surface of the threaded block (17) is fixedly connected with a connecting rod (19). A drive motor (9) is provided on one side of the frame (32), and the other end of the output shaft of the drive motor (9) is fixedly connected to the other end of the lead screw (18) through a rotating shaft. The oil-free compressor body ( 2) An exhaust pipe (3) is provided on the surface of the storage box (1). The other end of the exhaust pipe (3) is provided with a flexible conduit (5) through a flange (4). Three sets of connecting pipes (13) are provided on the top of the storage box (1). The other end of the flexible conduit (5) is provided in the connecting pipe (13). Two sets of grooves (28) are provided on both sides of the inner wall of the storage box (1). A partition (27) is provided in both sets of grooves (28). Three sets of spray pipes (7) are fixedly connected to the surface of the storage box (1) near the bottom. A solenoid valve (6) is provided on the surface of the three sets of spray pipes (7).

2. The pressure sharing mechanism for non-destructive inspection of the inner wall of a steel pipe according to claim 1, characterized in that: The top and bottom of the inner wall of the frame (32) are provided with sliding grooves (20), and a slider (21) is slidably connected in the sliding groove (20). The slider (21) is fixedly connected to one side of the threaded block (17).

3. The pressure sharing mechanism for non-destructive inspection of the inner wall of a steel pipe according to claim 1, characterized in that: The inner wall of the connecting tube (13) and the surface of the flexible conduit (5) are both provided with sealing rings (15), and a filter plate (14) is provided inside the connecting tube (13).

4. The pressure-sharing mechanism for non-destructive testing of the inner wall of steel pipes according to claim 1, characterized in that: Both sets of grooves (28) are provided with sealing strips (26), which are made of rubber.

5. The pressure-sharing mechanism for non-destructive testing of the inner wall of steel pipes according to claim 1, characterized in that: A support plate (8) is provided between the oil-free compressor body (2) and the storage box (1), and a collection box (10) is provided on one side of the storage box (1).

6. The pressure sharing mechanism for non-destructive testing of the inner wall of steel pipes according to claim 1, characterized in that: The inner walls of the three sets of spray pipes (7) are provided with a main board (22), a spring (23) is provided on one side of the main board (22), and a piston head (24) is fixedly connected to the other end of the spring (23). The inner walls of the three sets of spray pipes (7) are provided with a ring body (25), and the piston head (24) is adapted to the ring body (25).

7. The pressure-sharing mechanism for non-destructive testing of the inner wall of steel pipes according to claim 1, characterized in that: The storage box (1) has multiple sets of observation windows (11) on its back, and the surfaces of the three sets of observation windows (11) are all equipped with scales (12).

8. The pressure sharing mechanism for non-destructive testing of the inner wall of steel pipes according to claim 1, characterized in that: The storage box (1) has a fixed plate (29) fixedly connected to the bottom near the four corners. The bottom of the fixed plate (29) is provided with a base plate (30), and the surface of the base plate (30) is provided with studs (31).

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