Argon conveying device

Abstract

The invention discloses an argon conveying device which is used for conveying argon to opposite welding end faces of two pipelines. Comprising a sealing film used for blocking a cavity on the inner side of the welding end of one pipeline, a moving device capable of moving relative to the sealing film in the other pipeline, and a gas supply device capable of supplying argon to the position between the sealing film and the moving device, and the moving device comprises a cylinder; and the cylinder body of the cylinder is made of a flexible film. The sealing film is arranged at the end of the pipeline, the movable cylinder is used for limiting the argon storage area at the welding seam of the pipeline, argon protection welding of the welding seam can be achieved only by filling argon into the limited area, the using amount of argon is reduced, the welding cost is reduced, and the welding quality is improved through deformation of the cylinder. The cylinder can be used for conveying argon and can also be used for reducing the pipe diameter so as to reduce the use amount of argon.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline welding, and in particular to an argon gas conveying device. Background Art

[0002] Alloy steel pipe is a kind of pipe system material used to transport liquid or gas. Its application fields are very wide, mainly including the following aspects: Oil industry: Alloy steel pipe is often used in high-pressure and high-temperature pipe systems for oil drilling. It can withstand extreme working environments and ensure stable supply of oil and gas. Chemical industry: In many fields such as fertilizer, electricity, gas and refining, alloy steel pipes are more popular. However, alloy steel, especially high alloy steel, such as T91 / P91 / F91, T92 / P92 / F92, T122 / P122 / F122, etc., has a martensitic structure. The supply state is generally normalized + tempered, and the weldability is poor. It is easy to have cold cracks, embrittlement of welded joints, softening of HAZ area and other problems. These materials are easy to oxidize at high temperatures, so argon shielded welding must be used to prevent oxidation of the weld root and ensure the quality of the welded joint. During the argon shielded welding process, argon is filled into the weld to form a protective layer, isolate the air, and prevent the welding area from contacting with oxygen, thereby preventing oxidation and ensuring welding quality. In addition, as an inert gas, argon is not easy to react chemically with other substances, and can effectively protect the weld area and improve the performance and corrosion resistance of the welded joint.

[0003] In the actual welding process, argon is usually injected into the pipe from both ends so that the inside of the weld is in an argon environment. However, for a long pipe, if argon is injected from both ends, more argon will be destroyed, resulting in a waste of resources and an increase in cost. Therefore, a device is needed to directly deliver argon to the welding position in order to reduce the amount of argon used. Summary of the invention

[0004] In order to solve the problem of how to transport argon to the weld position during pipeline welding, the present invention provides an argon transport device, which can transport argon to the weld position and reduce the amount of argon used.

[0005] The technical solution adopted by the present invention is to design an argon gas delivery device for delivering argon gas to the opposite welding end faces of two pipelines, including a sealing film for sealing the inner cavity of the welding end of one of the pipelines, a moving device capable of moving relative to the sealing film in the other pipeline, and a gas delivery device capable of delivering argon gas between the sealing film and the moving device. The moving device includes a cylindrical cylinder, the cylinder body material of the cylindrical cylinder is a flexible membrane, one end of the cylindrical cylinder is coaxially fixedly connected to the port of the pipeline, and the other end of the cylindrical cylinder is controlled by a retractable device. Part of the cylinder body of the cylindrical cylinder enters the pipeline to form two coaxial cylinders inside and outside, the outer cylinder is turned inward to form an inner cylinder, and the inner cylinder is turned outward to form an outer cylinder. A retaining ring is arranged between the outer cylinder and the inner cylinder, the retaining ring, the outer cylinder and the inner cylinder form a sealed cavity, the inner cylinder and the center hole of the retaining ring are slidably matched, and the sealed cavity is connected to the air pressure control device.

[0006] In certain embodiments, the sealing film is a water-soluble paper film.

[0007] In certain embodiments, the moving device includes a moving module located in front of the cylindrical barrel, the moving module includes a plurality of guide wheels supporting the inner wall of the pipe, and the moving block is provided with a tip portion facing the sealing membrane.

[0008] In some embodiments, the tip portion is provided with serrations.

[0009] In some embodiments, a supporting wheel for supporting the cylindrical barrel is disposed at the rear end of the moving block.

[0010] In some embodiments, the air supply device includes an air supply pipe, and the inner cylinder is slidably mounted on the air supply pipe.

[0011] In certain embodiments, the air supply pipe is coaxially sleeved in the middle hole of the retaining ring, and the inner tube is located between the air supply pipe and the retaining ring.

[0012] In certain embodiments, the air supply tube is covered with an annular elastic airbag, and the inner tube is located between the annular elastic airbag and the air supply tube, so the annular elastic airbag is connected to the pressure control device.

[0013] In certain embodiments, the retaining ring is provided with an air supply pipe connected to the sealing cavity and an external air pressure control device.

[0014] In some embodiments, the end of the outer cylinder is clamped on the outside of the pipeline port by a clamp ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses a sealing film and a movable cylindrical tube at the end of the pipeline to define an area for storing argon gas at the weld of the pipeline. As long as argon gas is filled in the defined area, argon shielded welding of the weld can be achieved, thereby reducing the amount of argon gas used and the welding cost. By utilizing the deformation of the cylindrical tube, the cylindrical tube can be used to transport argon gas and can also be used to reduce the pipe diameter and thus reduce the amount of argon gas used. Since the cylindrical tube can be continuously moved along the pipeline, continuous welding of multiple sections of pipelines can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is described in detail below in conjunction with specific embodiments and drawings. In order to show details and facilitate understanding of its principles, it is not necessarily drawn to scale, and similar reference numerals may describe similar components in different views. The drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Among them: Figure 1 is a schematic diagram of an embodiment.

[0017] Figure 2 It is a schematic diagram of the moving block moving to the next weld.

[0018] In the figure, 1, sealing film; 2, outer tube; 3, inner tube; 4, retaining ring; 5, air supply pipe; 6, air delivery pipe; 7, first pipeline; 8, second pipeline; 9, welding seam; 10, center hole of retaining ring; 11, moving block; 12, guide wheel; 13, supporting wheel; 14, tip; 15, third pipeline; 16, annular elastic airbag; 17, retaining ring. DETAILED DESCRIPTION

[0019] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments, and the following embodiments do not limit the invention involved in the claims. In addition, all combinations of the features described in the embodiments are not necessarily required for the solutions of the invention.

[0020] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments. Example

[0021] like Figure 1 As shown, an argon delivery device is used to deliver argon to the opposite welding end faces of two pipes, comprising a sealing film 1 for sealing the inner cavity of the welding end of one of the pipes, a moving device capable of moving relative to the sealing film 1 in the other pipe, and a gas delivery device capable of delivering argon between the sealing film 1 and the moving device. The moving device includes a cylindrical barrel, the barrel body of which is made of an elastic flexible film, one end of which is coaxially fixedly connected to the port of the pipeline, and the end of the outer barrel 2 in this embodiment is clamped on the outside of the port of the pipeline by a clamping ring 17, so that the port of the cylindrical barrel is fixedly connected to the port of the pipeline. The diameter of the cylindrical barrel can be smaller than the diameter of the pipeline, and the elastic deformation of the cylindrical barrel can be used to make it sleeved on the end of the pipeline.

[0022] The other end of the cylindrical tube is controlled by the retracting and releasing device. Part of the cylindrical tube enters the pipe to form two coaxial cylinders. The outer tube 2 is turned inward to form the inner tube 3, and the inner tube 3 is turned outward to form the outer tube 2. A retaining ring 4 is arranged between the outer tube 2 and the inner tube 3. The retaining ring 4 forms a sealed cavity with the outer tube 2 and the inner tube 3. The inner tube 3 is slidably matched with the hole in the middle of the retaining ring 4. The sealed cavity is connected to the air pressure control device. The retaining ring 4 is provided with an air supply pipe 5 connecting the sealed cavity and the external air pressure control device.

[0023] The sealing film 1 may be, for example, a water-soluble paper film, so that it can be cleaned away with water later. Of course, it may also be other materials, such as elastic rubber films, which are easy to dispose of later.

[0024] The air supply device includes an air supply pipe 6, which is slightly smaller than the cylindrical tube. Since the cylindrical tube is flexible, the cylindrical tubes can be stacked and sleeved on the air supply pipe 6, so that the cylindrical tubes can be stored on the air supply pipe 6 or released outward along the air supply pipe 6. The air supply pipe 6 is connected to equipment such as an argon storage tank, so that argon is injected into the pipeline through the cylindrical tube.

[0025] Furthermore, the air supply pipe 6 is coaxially sleeved in the middle hole of the retaining ring 4 , and the inner tube 3 is located between the air supply pipe 6 and the retaining ring 4 , so that the inner tube 3 passes between the air supply pipe 6 and the retaining ring 4 .

[0026] When in use, first seal the sealing film 1 on the inner side of the left port of the first pipe 7, then make the port of the second pipe 8 adjacent to the port of the first pipe 7 to form a weld 9 to be welded, then make the port of the cylindrical tube fixedly connected to the port of the pipe, make part of the cylinder body of the cylindrical tube turn inward and enter the second pipe 8, so that the cylindrical tube forms two coaxial cylinders inside and outside the pipe, the outer tube 2 turns inward to form the inner tube 3, and the inner tube 3 turns outward to form the outer tube 2, then put the retaining ring 4 on the inner tube 3 and make the retaining ring 4 stuck between the outer tube 2 and the inner tube 3 at the port of the second pipe 8, the retaining ring 4 can be made of elastic rubber, so that it can use its own elastic force to be stuck in the The port of the pipeline, the inner cylinder 3 and the middle hole of the retaining ring 4 are slidably matched. Since the diameter of the cylindrical cylinder is larger than the middle hole of the retaining ring 4, the inner cylinder 3 and the middle hole of the retaining ring 4 are tightly fitted, so that the retaining ring 4, the outer cylinder 2 and the inner cylinder 3 form a sealed cavity, and then air is pumped into the sealed cavity through the air supply pipe 5. Under the pressure of the air, the inner cylinder 3 is continuously moved forward and turned outward to form the outer cylinder 2. In this process, the cylindrical cylinder sleeved on the air supply pipe 6 can be continuously released until the part where the inner cylinder 3 and the outer cylinder 2 are connected moves to a position close to the weld 9, and then the air supply pipe 6 is used to supply air, so that the gas is sent along the inner cylinder 3 to the weld 9, so that the inside of the weld 9 is in an argon gas protection environment.

[0027] like Figure 2 As shown, further, the moving device also includes a moving block 11 located in front of the cylindrical barrel, and the cylinder moves forward to push the moving block 11 forward. The moving block 11 includes several guide wheels 12 supporting the inner wall of the pipeline, and the rear end of the moving block 11 is provided with a supporting wheel 13 supporting the cylindrical barrel, so as to reduce the friction of the moving block 11 relative to the cylindrical barrel. The moving block 11 is provided with a tip 14 facing the sealing film 1. After the welding of the weld 9 is completed, the cylinder is used to push the moving block 11 to continue to move forward, so that the tip 14 punctures the sealing film 1, so that the moving block 11 and the cylindrical barrel pass through the sealing film 1 and continue to move forward, so that the moving block 11 can continue to move along the first pipeline 7, move to the weld 9 between the first pipeline 7 and the third pipeline 15, and then use the inner cylinder 3 to inject argon into the weld 9 to facilitate the welding of the weld 9, so as to achieve the welding of the pipeline section by section. The tip portion 14 is provided with serrations to facilitate penetrating the sealing membrane 1 .

[0028] The air supply pipe 6 is covered with an annular elastic airbag 16, and the inner tube 3 is located between the annular elastic airbag 16 and the air supply pipe 5, so the annular elastic airbag 16 is connected to the pressure control device. The pressure control device can be, for example, an air pump, which injects gas into the annular elastic airbag 16 to control the enlargement or reduction of the annular elastic airbag 16, thereby controlling the sliding or fixing of the inner tube 3 along the air supply pipe 6.

[0029] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them in similar ways, without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. An argon gas delivery device for delivering argon gas to the opposite welding end faces of two pipes, characterized in that: It comprises a sealing film for sealing the inner cavity of the welding end of one of the pipes, a moving device capable of moving relative to the sealing film in another pipe, and a gas supply device capable of supplying argon gas between the sealing film and the moving device. The moving device comprises a cylindrical cylinder, the cylinder body of the cylindrical cylinder is made of a flexible membrane, one end of the cylindrical cylinder is coaxially fixedly connected to the port of the pipe, and the other end of the cylindrical cylinder is controlled by a retracting device. Part of the cylinder body of the cylindrical cylinder enters the pipe to form two coaxial cylinders inside and outside. The outer cylinder is turned inward to form an inner cylinder, and the inner cylinder is turned outward to form an outer cylinder. A retaining ring is arranged between the outer cylinder and the inner cylinder. The retaining ring, the outer cylinder and the inner cylinder form a sealed cavity. The inner cylinder slides with the center hole of the retaining ring, and the sealed cavity is connected to the air pressure control device.

2. The argon gas delivery device according to claim 1, characterized in that: The sealing film is a water-soluble paper film.

3. The argon gas delivery device according to claim 1, characterized in that: The moving device comprises a moving module located in front of the cylindrical barrel, the moving module comprises a plurality of guide wheels supporting the inner wall of the pipeline, and the moving block is provided with a tip portion facing the sealing membrane.

4. The argon gas delivery device according to claim 3, characterized in that: The tip portion is provided with saw teeth.

5. The argon gas delivery device according to claim 3, characterized in that: A supporting wheel for supporting the cylindrical barrel is arranged at the rear end of the moving block.

6. The argon gas delivery device according to claim 1, characterized in that: The air supply device comprises an air supply pipe, and the inner cylinder is slidably sleeved on the air supply pipe.

7. The argon gas delivery device according to claim 6, characterized in that: The air supply pipe is coaxially sleeved in the middle hole of the retaining ring, and the inner cylinder is located between the air supply pipe and the retaining ring.

8. The argon gas delivery device according to claim 6, characterized in that: The air supply pipe is covered with an annular elastic airbag, and the inner tube is located between the annular elastic airbag and the air supply pipe, so the annular elastic airbag is connected to the pressure control device.

9. The argon gas delivery device according to claim 1, characterized in that: The retaining ring is provided with an air supply pipe communicating with the sealing cavity and an external air pressure control device.

10. The argon gas delivery device according to claim 1, characterized in that: The end of the outer cylinder is clamped on the outside of the pipeline port by a clamp ring.

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