Pipe orifice plugging tool

Abstract

A pipe orifice plugging tool is provided with two circular plugging plates in the same shape, an annular partition plate is arranged between the two plugging plates, the radius of the partition plate is smaller than that of the plugging plates, the partition plate is wrapped with an inflation hose, the inflation hose is provided with an inflation nozzle, and the inflation hose is inflated through the inflation nozzle; an air inlet pipe and an exhaust pipe sequentially penetrate through the two blocking plates to be fixed, one ends of the air inlet pipe and the exhaust pipe are fixedly provided with opening and closing valves, the tool is plugged into a pipe opening, the ends with the opening and closing valves are located on the outer side of the pipe opening, and a measuring instrument is fixed to the exhaust pipe. According to the method, the plugging sealing performance and plugging convenience are improved, the welding quality is effectively guaranteed, and the shipbuilding cost is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of offshore ship pipeline welding, and particularly relates to a pipe opening plugging tool. BACKGROUND

[0002] The pipe in the LNG ship deck cryogenic pipe unit is made of 304L and 316L white steel material, and when butt welding is performed after pipe cutting and blanking, argon arc welding needs to be used, the groove on the outer wall of the pipe is processed, and after butt joint, the welding gun is used for welding on the outer wall of the pipe, and single-sided welding is formed on both sides; when welding in this way, argon gas needs to be filled in the inner wall space of the pipe as a protective gas to ensure the welding quality, so inert gas needs to be filled in the inner cavity of the pipe as a welding protective gas to ensure the welding quality.

[0003] At present, the plugging way adopted by the welding construction personnel is that a hard steel plate or a wooden plate is used to clamp a soft sponge, the radius of the sponge is greater than that of the steel plate by about 50 mm, the plugging device is inserted into the pipe opening by force extrusion, and simple plugging is performed; since the simple plugging effect is poor and the sealing of the sponge with the pipe wall is insufficient, argon gas leakage easily causes welding defects in work, and a more professional plugging tool needs to be designed to solve the plugging device for the protective gas in the process of cryogenic pipe welding. SUMMARY

[0004] To solve the above problems, the application provides a new pipe opening plugging tool, and the technical scheme adopted by the application is as follows:

[0005] A pipe opening plugging tool has two circular plugging plates which are the same in shape, a circular ring-shaped partition plate is arranged between the two plugging plates, the radius of the partition plate is smaller than that of the plugging plate, the partition plate is wrapped with an inflatable hose air bag, the inflatable hose is provided with an inflation nozzle, and the inflatable hose air bag is inflated through the inflation nozzle.

[0006] An inlet pipe and an exhaust pipe are sequentially fixed through the two plugging plates, an opening and closing valve is fixed to one end of the inlet pipe and the exhaust pipe, the tool is inserted into the pipe opening, the end with the opening and closing valve is located outside the pipe opening, and a measuring instrument is fixed to the exhaust pipe.

[0007] The radius difference between the radius of the partition plate and that of the plugging plate is 30 mm in the pipe opening plugging tool.

[0008] The inflatable hose air bag exceeds the edge of the plugging plate on the outside after being inflated in the pipe opening plugging tool.

[0009] The inflation nozzle sequentially penetrates the partition plate and one plugging plate upwards in the pipe opening plugging tool.

[0010] The inlet pipe and the exhaust pipe are arranged above and below and are located on the upper semicircle and the lower semicircle of the plugging plate in the pipe opening plugging tool.

[0011] Furthermore, in the aforementioned pipe sealing fixture, after the air bladder of the inflatable hose is inflated, it fits tightly against the two blocking plates and the inner wall of the pipe opening.

[0012] This invention improves the sealing performance and ease of sealing, effectively ensures welding quality, and reduces shipbuilding costs. Attached Figure Description

[0013] Figure 1 This is a diagram illustrating the use of the tooling;

[0014] Figure 2 This is a front view structural diagram of the tooling;

[0015] Figure 3 This is a side view of the tooling structure when the air hose is not inflated;

[0016] Figure 4 This is a side view of the tooling structure when the air hose is being inflated;

[0017] Among them, 1-pipe, 2-outer plug, 2-1-inner plug, 3-partition, 4-inflation hose, 5-inlet pipe, 6-exhaust pipe, 7-opening and closing valve, 8-inflation nozzle, 9-sealing fixture. Detailed Implementation

[0018] The invention will be further described with reference to the accompanying drawings. Example

[0019] A pipe sealing tool, such as Figure 2 As shown, acrylic sheets are used as the main sealing material. Two identical circular sealing plates are used, with a circular partition fixed between them. The material is cut using a CNC engraving machine, and a special adhesive is used to bond the materials, preventing deformation and ensuring the sealing plates are transparent. An inflatable hose with the same radius is pre-installed in the annular groove formed by the partition and the sealing plates. Before inflation, the inflatable hose is in a soft, deflated state. Figure 3 As shown, the entire plugging tool is placed inside the pipe cavity. The inflatable hose airbag, similar to the inner tubes of bicycle wheels of different diameters, is inflated using an electric air inflator via an inflator nozzle, ultimately sealing the pipe hole. After inflating the inflatable hose airbag, as shown... Figure 4 As shown, the inflatable hose bladder expands under gas pressure, fitting tightly against three sides of the annular groove. Additionally, the upper surface of the hose fits tightly against the hose wall, forming a complete sealed surface. The inflatable hose bladder has an inflation nozzle that penetrates a partition and a stopper plate sequentially, used for air intake. The intake and exhaust pipes are fixed by penetrating two stoppers sequentially. An on / off valve is fixed to one end of each pipe. A tool is inserted into the pipe opening, with the end containing the on / off valve located on the outside of the opening, one on the upper half of the stopper plate and the other on the lower half. (See diagram) Figure 1As shown, when in use, first connect the argon gas pipe to the gas inlet pipe, connect the measuring instrument to the gas outlet pipe, open the gas inlet valve, input argon gas, and simultaneously observe the measuring instrument on the gas outlet valve to display the argon gas density of the discharged gas, until the argon gas density of the gas outlet pipe reaches the requirement, then close the gas inlet valve, and the welder can perform welding under the existing conditions. The application innovatively realizes effective plugging when the low-temperature pipe is inflated, improves the plugging sealing performance and the plugging convenience, effectively guarantees the welding quality, and reduces the shipbuilding cost.

Claims

1. A pipe end plugging tool, characterized in that, There are two circular plugs with the same shape, a circular ring partition is arranged between the two plugs, the radius of the partition is smaller than that of the plug, the outside of the partition is wrapped with an inflatable hose, the inflatable hose is provided with an inflation nozzle, and the inflatable hose is inflated through the inflation nozzle; The air inlet pipe and the exhaust pipe penetrate the two plugs in sequence and are fixed, one end of the air inlet pipe and the exhaust pipe is fixed with an opening and closing valve, the tooling is inserted into the pipe opening, the end with the opening and closing valve is located outside the pipe opening, and a measuring instrument is fixed on the exhaust pipe.

2. The pipe plugging tool of claim 1, wherein, The radius difference between the radius of the partition and the radius of the plug is 30mm.

3. The pipe mouth plugging tool according to claim 1, wherein, After the inflatable hose is inflated, the outside of the inflatable hose exceeds the edge of the plug.

4. The pipe plugging tool of claim 1, wherein, The inflation nozzle penetrates the partition and one plug in sequence upwards.

5. The pipe plugging tool of claim 1, wherein, The air inlet pipe and the exhaust pipe are arranged up and down and are located on the upper half circle and the lower half circle of the plug respectively.

6. The pipe plugging tool of claim 1, wherein, After the inflatable hose is inflated, the inflatable hose is tightly attached to the two plugs and the inner wall of the pipe opening.

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