Cold bending type steel pipe welding seam leakage detection device

Abstract

The utility model discloses a cold bending type steel pipe welding seam leakage detection device which comprises an operation table, two sets of sealing plugs are arranged on the two sides of a bearing frame, the bottoms of the two sets of sealing plugs are connected with a centering mechanism, an inflation pipe penetrates through the interior of one set of sealing plugs, and an electric telescopic rod is installed at the top of a supporting plate. One end of the electric telescopic rod is provided with a spray head, one side of the liquid storage tank is connected with the pump machine through a connecting pipe, and the other end of the pump machine is connected with the spray head through a connecting pipe. After the inflation pipe is externally connected with an air source, compressed air can be inflated into the steel pipe, detection liquid can be conveyed to the spray head through the pump machine and sprayed to the surface of the welding seam of the steel pipe, and therefore efficient, accurate and easy-to-operate leakage detection of the welding seam can be achieved through the structure.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe testing technology, specifically a leak detection device for weld seams of cold-bent steel pipes. Background Technology

[0002] In modern industrial production, cold-formed steel pipes are widely used in many fields such as construction, machinery manufacturing, and automobile industry. Because their application scenarios often have strict requirements for the sealing performance of steel pipes, such as pipelines for transporting liquids and gases, the quality of the steel pipe welds is directly related to the safety and stability of the entire system. Once there is a leak in the weld, it may cause serious safety accidents, resulting in huge economic losses and environmental hazards.

[0003] Traditional weld leak detection methods, such as hydrostatic testing, require sealing both ends of the steel pipe and injecting a large amount of water. This is cumbersome, consumes a lot of water, and has low testing efficiency. For large-scale steel pipe testing, it cannot meet the requirements of speed and accuracy. Professional non-destructive testing equipment is expensive and complex to maintain, making it unsuitable for the daily testing of small and medium-sized enterprises. Therefore, it is necessary to design a cold-bent steel pipe weld leak detection device to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a leak detection device for weld seams of cold-formed steel pipes to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a leak detection device for welded cold-formed steel pipes, comprising an operating table, a hydraulic cylinder mounted on the top of the operating table, a support frame for placing the steel pipe mounted on the top of the hydraulic cylinder, two sets of sealing plugs for sealing the pipe openings on both sides of the support frame, a centering mechanism for reversible movement of the two sets of sealing plugs connected to the bottom of the two sets of sealing plugs, an inflation tube passing through the interior of one set of sealing plugs, a pressure gauge mounted near the end of the inflation tube, a support plate mounted on one side of the top of the operating table, an electric telescopic rod mounted on the top of the support plate, one end of the electric telescopic rod passing through the interior of the support plate and mounted with a nozzle, a storage tank for storing detection liquid mounted on the top of the support plate on one side of the electric telescopic rod, one side of the storage tank being connected to a pump mounted on the top of the support plate via a connecting pipe, and the other end of the pump being connected to the nozzle via the connecting pipe.

[0006] Preferably, the centering mechanism includes a first motor, a cavity is provided on the inner side of the operating table, and limit grooves are provided on both inner walls of the cavity. Limiting rods are provided on the inner sides of the two sets of limit grooves. Two sets of movable seats are provided on the inner side of the cavity. The two ends of the two sets of movable seats pass through the inner sides of the two sets of limit grooves and are slidably connected to the limiting rods. A bidirectional screw is rotatably connected to the inner side of the cavity and threadedly connected to the two sets of movable seats. One end of the bidirectional screw is connected to the output end of the first motor installed on one side of the operating table. A fixed seat is provided on the top of the two sets of movable seats. A fixed cylinder is installed on the top of the two sets of fixed seats. Rotating seats are rotatably connected to the inner sides of the two sets of fixed cylinders. A sealing plug is installed on one end of the two sets of rotating seats.

[0007] Preferably, the outer ring of the other end of each of the two sets of rotating seats is fitted with a gear ring, each of the two sets of gear rings is meshed with a spur gear, one side of each of the two sets of spur gears is connected to the output end of the second motor, and the two sets of the second motors are respectively mounted on the top of the two sets of moving seats.

[0008] Preferably, the support frame is V-shaped, and multiple sets of rollers are installed on the inner side of the support frame.

[0009] Preferably, the sealing plug is tapered.

[0010] Preferably, an adjustable bracket is installed at one end of the support plate, a high-definition camera is installed at one end of the adjustable bracket, a control panel is installed on one side of the operating table, and a display screen is integrated on its top.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model, through the installation of a hydraulic cylinder, allows for adjustment of the support height according to the specifications of the steel pipe, facilitating the placement of cold-formed steel pipes of different specifications. A centering mechanism enables two sets of sealing plugs to move in opposite directions, ensuring precise alignment and tight sealing of the steel pipe opening, preventing internal gas leakage. An inflation tube passes through one set of sealing plugs, allowing compressed air to be injected into the steel pipe after connecting to an external air source. A pressure gauge monitors the internal air pressure in the steel pipe in real time, ensuring the inflation pressure meets testing requirements and maintaining a stable testing environment. A pump draws testing liquid from the storage tank, pressurizes it, and sends it to the nozzle via a connecting pipe. An electric telescopic rod controls the nozzle position and allows for flexible adjustment of the spraying distance, ensuring the testing liquid is evenly sprayed onto the weld surface of the steel pipe. Thus, through the above structure, efficient, accurate, and easy-to-operate weld leak inspection can be achieved. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 This is a bottom view of the present invention;

[0015] Figure 3 This is a side view and a top view of the present invention;

[0016] Figure 4 for Figure 1 Enlarged view of part A in the image;

[0017] Figure 5 for Figure 3 Enlarged view of part B in the image.

[0018] In the diagram: 1. Control panel, 2. Hydraulic cylinder, 3. Support frame, 4. Roller, 5. Cavity, 6. Limiting groove, 7. Limiting rod, 8. Moving seat, 9. Bidirectional screw, 10. First motor, 11. Fixed seat, 12. Fixed cylinder, 13. Rotating seat, 14. Sealing plug, 15. Gear ring, 16. Circular gear, 17. Second motor, 18. Inflation pipe, 19. Pressure gauge, 20. Support plate, 21. Electric telescopic rod, 22. Nozzle, 23. Liquid storage tank, 24. Connecting pipe, 25. Pump, 26. Adjustable bracket, 27. High-definition camera equipment, 28. Control panel. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1

[0021] Please refer to Figure 1-5 As shown, this utility model provides a leak detection device for weld seams of cold-formed steel pipes, including an operating table 1. A hydraulic cylinder 2 is installed on the top of the operating table 1. A support frame 3 is installed on the top of the hydraulic cylinder 2 to facilitate the placement of the steel pipe. Two sets of sealing plugs 14 are provided on both sides of the support frame 3 to facilitate the sealing of the steel pipe openings. The bottom of the two sets of sealing plugs 14 is connected to a centering mechanism to facilitate their reverse movement. An inflation pipe 18 passes through the interior of one set of sealing plugs 14. A pressure gauge 19 is installed near the end of the inflation pipe 18. A support plate 20 is installed on one side of the top of the operating table 1. An electric telescopic rod 21 is installed on the top of the support plate 20. One end of the electric telescopic rod 21 passes through the interior of the support plate 20 and is equipped with a nozzle 22. A storage tank 23 for storing detection liquid is installed on the top of the support plate 20, located on one side of the electric telescopic rod 21. One side of the storage tank 23 is connected to a pump 25 installed on the top of the support plate 20 through a connecting pipe 24. The other end of the pump 25 is connected to the nozzle 22 through the connecting pipe 24.

[0022] Specifically, the hydraulic cylinder 2 allows for adjustment of the height of the support frame 3 according to the specifications of the steel pipe, facilitating the placement of cold-formed steel pipes of different specifications. The centering mechanism enables the two sets of sealing plugs 14 to move in opposite directions, ensuring precise alignment and tight sealing of the steel pipe opening to prevent internal gas leakage. The inflation pipe 18 passes through one set of sealing plugs 14, allowing compressed air to be injected into the steel pipe after connecting to an external air source. The pressure gauge 19 monitors the air pressure inside the steel pipe in real time, ensuring that the inflation pressure meets the testing requirements and maintaining a stable testing environment. The pump 25 draws test liquid from the storage tank 23, pressurizes it, and sends it to the nozzle 22 via the connecting pipe 24. The electric telescopic rod 21 controls the position of the nozzle 22, allowing for flexible adjustment of the spraying distance and uniform spraying of the test liquid onto the weld surface of the steel pipe. Thus, through the above structure, efficient, accurate, and easy-to-operate weld leak inspection can be achieved.

[0023] The centering mechanism includes a first motor 10. A cavity 5 is formed on the inner side of the operating platform 1. Limiting grooves 6 are formed on both inner walls of the cavity 5. Limiting rods 7 are provided on the inner sides of both sets of limiting grooves 6. Two sets of movable seats 8 are provided inside the cavity 5. The two ends of the two sets of movable seats 8 pass through the inner sides of the two sets of limiting grooves 6 and are slidably connected to the limiting rods 7. A bidirectional screw 9 is rotatably connected to the inner side of the cavity 5 and threadedly connected to the two sets of movable seats 8. One end of the bidirectional screw 9 is connected to the output end of the first motor 10 installed on one side of the operating platform 1. A fixed seat 11 is provided on the top of each set of movable seats 8. A fixed cylinder 12 is installed on the top of each set of fixed seats 11. The inner sides of the two sets of fixed cylinders 12... Each side is rotatably connected to a rotating seat 13, and a sealing plug 14 is installed at one end of each rotating seat 13. By starting the first motor 10, its output shaft can drive the bidirectional screw 9 to rotate. Due to the transmission characteristics of the thread, when the bidirectional screw 9 rotates, the two moving seats 8 will move in opposite directions along the axial direction of the bidirectional screw 9 under its action. As the moving seats 8 move, the sealing plugs 14 fixed on their tops gradually approach the pipe ends of the steel pipe. When the sealing plugs 14 are tightly inserted into the pipe ends, the steel pipe can be sealed. Thus, by setting it up, the sealing plugs 14 can be precisely and efficiently connected to the pipe ends of steel pipes with different diameters and placement states, ensuring the sealing effect.

[0024] The outer rings of the other ends of the two sets of rotating seats 13 are fitted with gear rings 15, and the two sets of gear rings 15 are meshed with spur gears 16. One side of the two sets of spur gears 16 is connected to the output end of the second motor 17. The two sets of second motors 17 are respectively installed on the top of the two sets of moving seats 8. By starting the two sets of second motors 17, the two sets of second motors 17 can drive the two sets of spur gears 16 to rotate. The two sets of spur gears 16 can drive the two sets of gear rings 15 to rotate through meshing with the two sets of gear rings 15, thereby driving the two sets of rotating seats 13 to rotate. The two sets of rotating seats 13 can drive the sealing plug 14 and the steel pipe to rotate. Thus, by setting up, the subsequent spraying operation of the weld position detection liquid can be facilitated.

[0025] The support frame 3 is V-shaped, and multiple sets of rollers 4 are installed on the inner side of the support frame 3. The V-shaped support frame 3 can form a good fit with the circular outer surface of the cold-formed steel pipe. No matter how the diameter of the steel pipe changes, it can find a relatively stable placement position on the V-shaped support frame 3. When the steel pipe needs to be placed on the support frame 3, the rollers 4 can reduce the friction between the steel pipe and the support frame 3, so that the steel pipe can move more easily along the length of the support frame 3 to the appropriate testing position.

[0026] The sealing plug 14 is tapered, which allows it to better fit the opening of the steel pipe and achieve a good sealing effect.

[0027] The support plate 20 has an adjustable bracket 26 installed at one end, and a high-definition camera 27 is installed at the other end of the adjustable bracket 26. A control panel 28 is installed on one side of the operating table 1, and a display screen is integrated on its top. The high-definition camera 27 can be flexibly adjusted in position and angle by means of the adjustable bracket 26 to achieve accurate acquisition of the fine features of the weld. Combined with the control panel 28 which can centrally control each step of the inspection process and the display screen which can display the weld status, air pressure and other information in real time, the convenience of inspection and the accuracy of recording are greatly improved.

[0028] Working principle: First, start the hydraulic cylinder 2 to adjust the support frame 3 to a suitable height. Then, place the cold-formed steel pipe on the support frame 3. Next, start the first motor 10, whose output shaft can drive the bidirectional screw 9 to rotate. Due to the transmission characteristics of the thread, when the bidirectional screw 9 rotates, the two sets of moving seats 8 will move in opposite directions along the axial direction of the bidirectional screw 9 under its action. As the moving seats 8 move, the sealing plugs 14 fixed on their tops gradually approach the pipe ends. When the sealing plugs 14 are tightly inserted into the pipe ends, the steel pipe can be sealed. Open the air source, and gas can enter the steel pipe through the air filling pipe 18. Observe the pressure gauge 19 value. When the air pressure reaches the preset detection pressure, close the air source. Then, start the pump 25. The detection liquid is pressurized from the storage tank 23 by the pump 25 and sprayed out from the nozzle 22. Operate the electric telescopic rod 21 to adjust the position of the nozzle 22 so that the detection liquid is in the correct position. The testing liquid evenly covers the weld seam of the steel pipe. Simultaneously, by activating two sets of second motors 17, the two sets of second motors 17 drive two sets of spur gears 16 to rotate. The two sets of spur gears 16, through meshing with two sets of gear rings 15, drive the two sets of gear rings 15 to rotate, which in turn drive the two sets of rotating seats 13 to rotate. The two sets of rotating seats 13 drive the sealing plug 14 and the steel pipe to rotate, thus achieving comprehensive spraying of the steel pipe weld seam. Finally, the weld seam surface is carefully observed. If bubbles emerge or flow marks appear in the testing liquid, it indicates a weld seam leak point, which is marked with a marker pen. At the same time, the high-definition camera equipment 27 can accurately capture the subtle features of the weld seam. Combined with the control panel 28 that can centrally control each stage of the testing process and the display screen that can display multiple information such as weld seam status and air pressure in real time, the convenience of testing and the accuracy of recording are greatly improved, thus completing the entire operation process.

[0029] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cold-formed steel tube weld leak detection device, comprising an operating table (1), characterized in that: The top of the operating platform (1) is provided with a hydraulic cylinder (2), the top of the hydraulic cylinder (2) is provided with a supporting frame (3) for placing steel pipes, both sides of the supporting frame (3) are provided with two groups of sealing plugs (14) for sealing the pipe orifice of the steel pipe, the bottom of the two groups of sealing plugs (14) is connected with a centering mechanism for facilitating the reverse movement thereof, the inside of one group of sealing plugs (14) is penetrated by an inflation tube (18), the position close to the end of the inflation tube (18) is provided with a pressure gauge (19), one side of the top of the operating platform (1) is provided with a supporting plate (20), the top of the supporting plate (20) is provided with an electric telescopic rod (21), one end of the electric telescopic rod (21) penetrates through the inside of the supporting plate (20) and is provided with a spray head (22), the top of the supporting plate (20) is provided on one side of the electric telescopic rod (21) with a liquid storage tank (23) for storing detection liquid, one side of the liquid storage tank (23) is connected with a pump (25) provided on the top of the supporting plate (20) through a connecting pipe (24), the other end of the pump (25) is connected with the spray head (22) through the connecting pipe (24).

2. A cold-formed steel tube weld leak detection device according to claim 1, characterized in that: The centering mechanism comprises a first motor (10), the inside of the operating platform (1) is provided with a cavity (5), the inside walls of both sides of the cavity (5) are provided with limiting grooves (6), the inside of both groups of limiting grooves (6) is provided with limiting rods (7), the inside of the cavity (5) is provided with two groups of moving seats (8), both ends of both groups of moving seats (8) penetrate into the inside of both groups of limiting grooves (6) and are connected with the limiting rods (7) in a sliding mode, the inside of the cavity (5) is rotatably connected with a bidirectional screw rod (9) which is threadedly connected with both groups of moving seats (8), one end of the bidirectional screw rod (9) is connected with the output end of the first motor (10) provided on one side of the operating platform (1), the top of both groups of moving seats (8) is provided with fixed seats (11), the top of both groups of fixed seats (11) is provided with fixed cylinders (12), the inside of both groups of fixed cylinders (12) is rotatably connected with rotating seats (13), one end of both groups of rotating seats (13) is provided with the sealing plugs (14).

3. A cold-formed steel tube weld leak detection device according to claim 2, characterized in that: The other end of both groups of rotating seats (13) is provided with gear rings (15), both groups of gear rings (15) are engaged with circular gear wheels (16), one side of both groups of circular gear wheels (16) is connected with the output end of a second motor (17), both groups of second motors (17) are respectively provided on the top of both groups of moving seats (8).

4. The cold-formed steel tube weld leak detection device according to claim 1, characterized in that: The supporting frame (3) is provided in a V shape, and a plurality of rollers (4) are installed on the inside of the supporting frame (3).

5. A cold-formed steel tube weld leak detection device according to claim 4, characterised in that: The sealing plug (14) is provided in a conical shape.

6. The cold-formed steel tube weld leak detection device according to claim 1, wherein: One end of the supporting plate (20) is provided with an adjustable support (26), one end of the adjustable support (26) is provided with a high-definition camera device (27), one side of the operating platform (1) is provided with a control panel (28), and a display screen is integrally installed on the top of the control panel (28).

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