Immersed spiral steel pipe finished product leakage detection device

Abstract

The invention relates to an immersed spiral steel pipe finished product leakage detection device, which comprises a bottom frame, a water tank, water, a supporting seat, a pointer assembly, a right plugging cover, a left plugging cover, a right air bag, a left air bag, an air pipeline I, an air pipeline II and a pull rod, and is characterized in that a spiral steel pipe is hoisted and placed on the supporting seat in the water tank, and the left air bag and the right air bag are used for plugging the two ends of the spiral steel pipe respectively; gas is filled into the inner cavity of the spiral steel pipe, water is filled into the water tank through the water inlet pipe until the spiral steel pipe is submerged by the water surface, bubbles emerge at the defective positions, the positions of the bubbles are observed, namely, the defective positions, the pointer assembly is moved, the pointer points to the defective positions, and then the small magnet is used for adsorption to make marks. According to the invention, the leakage part of the spiral steel pipe can be accurately detected.

Description

Technical Field

[0001] This invention relates to the field of spiral steel pipe manufacturing technology, and in particular to a submersible spiral steel pipe finished product leakage detection device. Background Technology

[0002] The production process of spiral welded steel pipe is as follows: The strip steel is uncoiled from the coil, then leveled, trimmed, planed, cleaned, and pre-bent. It is then rolled at room temperature in a forming machine by multiple rollers to form a circular tube blank with an open gap. This blank is then welded using an automatic double-wire double-sided submerged arc welding process to produce the finished spiral welded steel pipe. The raw material strip steel itself contains defects such as cracks, and during the welding process, defects such as porosity and fissures are unavoidable. Since spiral welded steel pipes are widely used in pipeline transportation in industries such as petroleum, chemical, water supply, and gas supply, leaks are not permitted in the finished product. Therefore, leak detection is essential for the finished spiral welded steel pipes. Existing water pressure testing methods can only detect whether there is a leak in the entire spiral welded steel pipe, but cannot determine the specific location of the leak. Spiral welded steel pipes are generally 12-18 meters long and can have a diameter of over 1 meter. The inability to pinpoint the exact location of the defect severely affects subsequent repair welding work. Therefore, the industry urgently needs to solve this problem. Summary of the Invention

[0003] The purpose of this invention is to provide an immersion-type spiral steel pipe finished product leakage detection device, which can detect leaks in the finished spiral steel pipe during the manufacturing process, determine the specific location of the leak, and facilitate subsequent repair welding work.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A submersible spiral steel pipe leakage detection device includes a base frame, a water tank, water, support seats, a pointer assembly, a right sealing cover, a left sealing cover, a right airbag, a left airbag, an air pipeline (line 1), an air pipeline (line 2), and a pull rod. The water tank is mounted on the base frame, and all four walls of the water tank are transparent. Two support seats are provided, both placed in the water tank. The spiral steel pipe is placed on the support seats. The right airbag is placed in the inner cavity of the right end of the spiral steel pipe, and the left airbag is placed in the inner cavity of the left end of the spiral steel pipe. The right and left airbags are connected by the first air pipeline. The right sealing cover is positioned... The right end of the spiral steel pipe serves to block the right airbag, while the left end cap serves to block the left airbag. Two threaded rods are used to tighten and fix the right and left end caps. The left end of air line one passes through the hole on the left end cap and is connected to the air source through a quick-connect pipe connector. Air line two passes through the holes on the left airbag and the left end cap and is connected to the air source through a quick-connect pipe connector. The pointer assembly is mounted on the base frame. During testing, the entire spiral steel pipe is submerged in water.

[0005] The aforementioned submersible spiral steel pipe finished product leakage detection device includes a pointer assembly comprising a pointer rod, a support rod, a sliding sleeve, a pointer support, a spring, and a clamping block. The support rod has a rectangular cross-section and is mounted on a base frame. The sliding sleeve is slidably fitted onto the support rod. A pointer support is provided below the sliding sleeve. The pointer rod is movable up and down on the pointer support. A pointer is provided at the lower end of the pointer rod. A spring and a clamping block are provided in the cavity below the pointer support. The clamping block presses against the pointer rod under the elastic force of the spring.

[0006] In the aforementioned submersible spiral steel pipe finished product leakage detection device, the right end face of the clamping block is spherical.

[0007] The aforementioned immersion-type spiral steel pipe leakage detection device has annular protrusions on the right and left sealing caps facing the spiral steel pipe. The inner diameter of the annular protrusions corresponds to the outer diameter of the spiral steel pipe.

[0008] In the aforementioned submersible spiral steel pipe finished product leakage detection device, both the right and left sealing covers are suspended by ropes from the upper crossbeam of the base frame.

[0009] The present invention has the following advantages: In this invention, a spiral steel pipe is hoisted and placed on a support base in a water tank. The two ends of the spiral steel pipe are sealed using left and right air bladders. Gas is injected into the inner cavity of the spiral steel pipe, and water is injected into the water tank through the water inlet pipe until the water surface submerges the spiral steel pipe. Bubbles will emerge at defective locations. The location of the bubbles is the defective area. The pointer assembly is moved so that the pointer points to the defective area, and a small magnet is used to mark it. This invention can accurately detect the leakage points of the spiral steel pipe. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the present invention; Figure 2 for Figure 1 View from AA direction; Figure 3 This is a schematic diagram of the support base; Figure 4 for Figure 2 Partial view at point B in the middle; The labels in the diagram represent: 1. Base frame, 2. Water tank, 3. Water, 4. Support base, 5. Pointer assembly, 6. Right sealing cap, 7. Left sealing cap, 8. Right airbag, 9. Left airbag, 10. Spiral steel pipe, 11. Air pipe line one, 12. Air pipe line two, 13. Pipe joint, 14. Water inlet pipe, 15. Drain pipe, 16. Rope, 17. Pull rod, 5-1. Pointer upright, 5-2. Support rod, 5-3. Sliding sleeve, 5-4. Upright support, 5-5. Pointer, 5-6. Spring, 5-7. Clamping block. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] The present invention provides a submersible spiral steel pipe finished product leakage detection device, such as... Figure 1 and Figure 2 As shown, a rectangular water tank 2 is set on a base frame 1. Two support seats 4 are located in the middle of the water tank 2. The support seats 4 have V-shaped grooves. The spiral steel pipe 10 is hoisted and placed in the V-shaped grooves. During leak detection, a right airbag 8 and a left airbag 9 are placed in the inner cavities of both ends of the spiral steel pipe, respectively. First, air is injected into the two airbags through air pipe 11 to seal the inner cavity of the steel pipe. Then, air is injected into the inner cavity of the spiral steel pipe through air pipe 2 12. Air pipe 2 12 passes through the left airbag and is sealed and fixed together with the left airbag. A right sealing cap 6 and a left sealing cap 7 are set on both ends of the spiral steel pipe to block the two airbags and prevent them from overflowing. The right sealing cap and the left sealing cap are fixed together using a pull rod 17 with threads at both ends. The tightness is adjusted by the threads. The spiral steel pipe is completely immersed in the water in the water tank.

[0013] The present invention discloses a submersible spiral steel pipe finished product leakage detection device. The pointer assembly 5 includes a pointer rod 5-1, a support rod 5-2, a sliding sleeve 5-3, a rod support 5-4, a pointer 5-5, a spring 5-6, and a pressing block 5-7. The support rod 5-2 has a rectangular cross-section and is mounted on a base frame 1. The sliding sleeve 5-3 is slidably fitted onto the support rod 5-2. The rod support 5-4 is located below the sliding sleeve 5-3. The pointer rod 5-1 is movable up and down on the rod support 5-4. The pointer 5-5 is located at the lower end of the pointer rod 5-1. The spring 5-6 and the pressing block 5-7 are located in the cavity below the rod support 5-4. The pressing block 5-7 presses against the pointer rod 5-1 under the elastic force of the spring 5-6.

[0014] The present invention discloses a submersible spiral steel pipe finished product leakage detection device, wherein the right end face of the clamping block 5-7 is spherical, and when the clamping block 5-7 clamps the pointer rod 5-1 and moves up and down, it will not get stuck.

[0015] The present invention discloses a submersible spiral steel pipe finished product leakage detection device, wherein annular protrusions are provided on the right sealing cover 6 and the left sealing cover 7 on the side surface facing the spiral steel pipe 10. The inner diameter of the annular protrusions corresponds to the outer diameter of the spiral steel pipe 10. In order to accommodate spiral steel pipes of different specifications, the annular protrusions can be provided with multiple corresponding diameter sizes.

[0016] The present invention provides a submersible spiral steel pipe finished product leakage detection device, wherein the right sealing cover 6 and the left sealing cover 7 are both suspended from the upper crossbeam of the base frame 1 by ropes 16, which facilitates manual movement during leakage detection operations.

[0017] The present invention discloses a submersible spiral steel pipe leakage detection device. The working principle is as follows: During leak detection, the spiral steel pipe 10 is first hoisted and placed on the support base 4. At this time, there is no water in the water tank. Then, a right airbag 8 and a left airbag 9 are placed in the inner cavities at both ends of the spiral steel pipe, respectively. The right sealing cap 6 and the left sealing cap 7 are installed and fixed to both ends of the spiral steel pipe using a pull rod 17. Marking lines are provided on both the right sealing cap 6 and the left sealing cap 7; ensure the two marking lines are aligned. Then, the air pipe 11 is connected via a quick-connect pipe fitting. 13 Connect the air source and inflate the two air bags to seal the inner cavity of the steel pipe. Then, inflate the inner cavity of the spiral steel pipe 10 through the second air pipe 12. After inflation, fill the water tank with water through the water inlet pipe 14 until the spiral steel pipe is submerged. If there is a leak, bubbles will appear. After manually observing the bubbles, move the pointer assembly 5 so that the pointer points to the defective part. Drain water through the drain pipe 15. Use a small magnet to attach to the position pointed to by the pointer and mark it. Finally, transfer the spiral steel pipe to the next process.

Claims

1. A submersible spiral steel pipe finished product leakage detection device, characterized in that: Includes a base frame (1), a water tank (2), water (3), a support base (4), a pointer assembly (5), a right sealing cap (6), a left sealing cap (7), a right airbag (8), a left airbag (9), an air pipe one (11), an air pipe two (12), and a pull rod (17). The water tank (2) is mounted on the base frame (1), and all four walls of the water tank (2) are transparent. There are two support bases (4), both of which are set in the water tank (2). The spiral steel pipe (10) is placed on the support base (4). The right airbag (8) is placed in the inner cavity of the right end of the spiral steel pipe (10), and the left airbag (9) is placed in the inner cavity of the left end of the spiral steel pipe (10). The right airbag (8) and the left airbag (9) are connected by the air pipe one (11). The right sealing cap (6) is connected to the left airbag (9). 6) Located on the right side of the spiral steel pipe (10), it serves to block the right airbag (8). The left sealing cap (7) is located on the left side of the spiral steel pipe (10), serving to block the left airbag (9). The right sealing cap (6) and the left sealing cap (7) are tightened and fixed using two threaded pull rods (17). The left end of the first air pipe (11) passes through the hole on the left sealing cap (7) and is connected to the air source through the quick-connect pipe connector (13). The second air pipe (12) passes through the hole on the left airbag (9) and the left sealing cap (7) and is connected to the air source through the quick-connect pipe connector (13). The pointer assembly (5) is installed on the base frame (1). During the test, the spiral steel pipe (10) is completely submerged in water (3).

2. The submersible spiral steel pipe finished product leakage detection device according to claim 1, characterized in that: The pointer assembly (5) includes a pointer rod (5-1), a support rod (5-2), a sliding sleeve (5-3), a rod support (5-4), a pointer (5-5), a spring (5-6), and a pressing block (5-7). The support rod (5-2) has a rectangular cross-section and is mounted on the base frame (1). The sliding sleeve (5-3) is slidably fitted onto the support rod (5-2). The rod support (5-4) is located below the sliding sleeve (5-3). The pointer rod (5-1) can be moved up and down and is mounted on the rod support (5-4). The pointer (5-5) is located at the lower end of the pointer rod (5-1). The spring (5-6) and the pressing block (5-7) are located in the cavity below the rod support (5-4). The pressing block (5-7) presses against the pointer rod (5-1) under the elastic force of the spring (5-6).

3. The immersion spiral steel pipe finished product leakage detection device according to claim 2, characterized in that: The right end face of the clamping block (5-7) is spherical.

4. The submersible spiral steel pipe finished product leakage detection device according to claim 1, characterized in that: On the right sealing cap (6) and the left sealing cap (7), there are circular protrusions on the side surface facing the spiral steel pipe (10), and the inner diameter of the circular protrusions corresponds to the outer diameter of the spiral steel pipe (10).

5. The submersible spiral steel pipe leakage detection device according to claim 1, characterized in that: Both the right sealing cap (6) and the left sealing cap (7) are suspended from the upper crossbeam of the base frame (1) by ropes (16).

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