Argon arc welding auxiliary device for ship pipeline

Abstract

The argon arc welding auxiliary device for the ship pipeline comprises a first air bag assembly, a second air bag assembly and a connecting pipe assembly, and the connecting pipe assembly is connected between the first air bag assembly and the second air bag assembly. The first air bag assembly comprises a first air bag and a first inflation pipe connected with the first air bag. The second air bag assembly comprises a second air bag and a second inflation tube connected with the second air bag. The first inflation pipe is provided with a first inflation inlet used for inflating the first air bag, the second inflation pipe is provided with a second inflation inlet used for inflating the second air bag, and the connecting pipe assembly is provided with a third inflation inlet used for inflating the ship pipeline. The first inflation inlet is located in the first air bag, and the second inflation inlet is located in the second air bag. By arranging the first air bag assembly and the second air bag assembly, a relatively closed space is formed in the welding position of the ship pipeline, the welding area is inflated through the third inflation opening, and the purpose of welding protection is achieved.

Description

Technical Field

[0001] The utility model relates to the field of shipbuilding, in particular to an argon arc welding auxiliary device for ship pipelines. Background Art

[0002] During shipbuilding, Class I and II piping components undergo nondestructive testing (NDT) using X-ray or gamma-ray inspections. These include piping systems such as steam and fuel oil piping. Piping systems with design pressures greater than 1.6 MPa or temperatures greater than 150°C are classified as Class I, while those with design pressures greater than 0.7 MPa and temperatures greater than 60°C are classified as Class II. Class I and II piping systems are typically butt-welded. Due to the high temperatures and pressures of the media within the piping, leakage is not permitted.

[0003] Taking the chemical cargo tank transfer system as an example, there are about a thousand stainless steel pipes, of which the Class I pipe system adopts argon arc butt welding. The welding position needs to be isolated from the air and the construction is carried out under the protection of argon gas. The outer diameter of the pipe ranges from Various specifications.

[0004] In the previous welding process, cotton cloth, sponges, plugs, etc. were used to seal the pipe ends, and argon was filled from the other end of the pipe. After a certain period of time, welding began. For pipes of different diameters, sponges or plugs of different sizes were required. Especially when the diameter was relatively large, the time for filling with argon was longer, and the lack of isolation led to a large loss of argon. Bubbles and weld nodules were easily generated at the welding position, resulting in a low pass rate for one-time welding submission. Utility Model Content

[0005] In order to adapt to the argon arc welding inflation of pipelines with different specifications and calibers, the utility model provides an argon arc welding auxiliary device for ship pipelines, which seals the pipeline through an air bag to meet the inflation requirements of pipelines with different specifications and calibers.

[0006] The technical objectives of this utility model are achieved through the following technical solutions:

[0007] An argon arc welding auxiliary device for ship pipelines, comprising a first airbag assembly, a second airbag assembly, and a connecting pipe assembly, wherein the connecting pipe assembly is connected between the first airbag assembly and the second airbag assembly;

[0008] The first airbag assembly includes a first airbag and a first inflation tube connected to the first airbag; the second airbag assembly includes a second airbag and a second inflation tube connected to the second airbag;

[0009] One end of the first inflation tube is blocked, the other end of the first inflation tube is connected to one end of the connecting tube assembly, one end of the second inflation tube is connected to the other end of the connecting tube assembly, and the other end of the second inflation tube is connected to the inflation gas source;

[0010] The first inflation tube is provided with a first inflation port for inflating the first airbag, the second inflation tube is provided with a second inflation port for inflating the second airbag, and the connecting pipe assembly is provided with a third inflation port for inflating the ship pipeline; the first inflation port is located in the first airbag, and the second inflation port is located in the second airbag.

[0011] Furthermore, a pressure relief valve is provided at the third inflation port, and after the pressure relief valve is opened, the third inflation port inflates air into the ship pipeline.

[0012] Furthermore, circular holes are respectively provided at relative positions of the first airbag, and the first inflation tube passes through the first airbag from the circular holes, and the first inflation tube is provided with a locking piece for sealing the circular hole at the position where it passes through the circular hole of the first airbag; circular holes are also respectively provided at relative positions of the second airbag, and the second inflation tube passes through the second airbag from the circular holes, and the second inflation tube is also provided with a locking piece for sealing the circular hole at the position where it passes through the circular hole of the second airbag.

[0013] Furthermore, the locking member includes an annular baffle, an annular gasket and a locking nut arranged on the outer walls of the first inflation tube and the second inflation tube, the annular baffle is fixed to the outer walls of the first inflation tube and the second inflation tube, the annular gasket is sleeved on the outside of the first inflation tube and the second inflation tube, and the locking nut is threadedly connected to the outer walls of the first inflation tube and the second inflation tube; the annular baffle is located inside the first airbag and the second airbag, the annular gasket and the locking nut are arranged outside the first airbag and the second airbag, the locking nut presses the annular gasket against the circular hole from the outside, and the annular baffle presses against the circular hole from the inside.

[0014] Furthermore, the first inflation tube and the connecting tube assembly are connected by threaded fitting, and the second inflation tube and the connecting tube assembly are connected by threaded fitting.

[0015] Furthermore, the first airbag and the second airbag have a cylindrical shape after being inflated, and the circumferential surface of the cylindrical shape of the first airbag and the second airbag fits the inner wall of the ship pipeline.

[0016] Compared with the existing technology, the beneficial effect of the present invention is that the present invention achieves the blocking of both ends of the ship pipeline through the arrangement of the first airbag assembly and the second airbag assembly, thereby forming a relatively closed space at the welding position of the ship pipeline, and inflating the welding area through the third inflation port to achieve the purpose of welding protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a schematic diagram of an argon arc welding auxiliary device for ship pipelines.

[0018] Figure 2 The utility model is an exploded schematic diagram of an argon arc welding auxiliary device for ship pipelines.

[0019] Figure 3 It is a cross-sectional schematic diagram of the first airbag assembly in the present utility model.

[0020] Figure 4 It is a cross-sectional schematic diagram of the second airbag assembly in the present utility model.

[0021] Figure 5 The utility model is a schematic diagram of the use of the argon arc welding auxiliary device for ship pipelines.

[0022] In the picture:

[0023] 1. First airbag assembly; 2. Second airbag assembly; 3. Connecting tube assembly; 4. First airbag; 5. First inflation tube; 6. Second airbag; 7. Second inflation tube; 8. First inflation port; 9. Second inflation port; 10. Third inflation port; 11. Annular baffle; 12. Annular gasket; 13. Locking nut; 14. Pressure relief valve. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below in conjunction with specific embodiments:

[0025] An auxiliary device for argon arc welding of ship pipelines, such as Figure 1 and Figure 2 As shown, it includes a first airbag assembly 1, a second airbag assembly 2, and a connecting pipe assembly 3. The connecting pipe assembly 3 is connected between the first airbag assembly 1 and the second airbag assembly 2. The first airbag assembly 1 and the second airbag assembly 2 are connected in series through the connecting pipe assembly 3;

[0026] like Figure 3 As shown, the first airbag assembly 1 includes a first airbag 4 and a first inflation tube 5 connected to the first airbag 4 ; one end of the first inflation tube 5 is blocked, and the other end of the first inflation tube 5 is connected to one end of the connecting tube assembly 3 .

[0027] like Figure 4 As shown, the second airbag assembly 2 includes a second airbag 6 and a second inflation tube 7 connected to the second airbag 6; one end of the second inflation tube 7 is connected to the other end of the connecting tube assembly 3, and the other end of the second inflation tube 7 is connected to an inflation gas source, such as an argon gas cylinder.

[0028] The first inflation tube 5 is provided with a first inflation port 8 for inflating the first airbag 4, and the second inflation tube 7 is provided with a second inflation port 9 for inflating the second airbag 6. The first inflation port 8 and the second inflation port 9 are through-holes passing through the tube wall, and may be one or more. The connecting tube assembly 3 is provided with a third inflation port 10 for inflating the vessel's pipeline. The first inflation port 8 is located in the first airbag 4, and the second inflation port 9 is located in the second airbag 6.

[0029] Preferably, a pressure relief valve 14 is provided at the third inflation port 10. After the pressure relief valve 14 is opened, the third inflation port 10 inflates air into the ship pipeline. The setting of the pressure relief valve 14 can ensure that air is first inflated into the first airbag and the second airbag during inflation, so that the first airbag 4 and the second airbag 6 can be expanded.

[0030] The first airbag 4 and the second airbag 6 are made of rubber material and have a cylindrical shape after being inflated. The structures of the first airbag and the second airbag are exactly the same. The circumferential surfaces of the cylindrical shapes of the first airbag 4 and the second airbag 6 fit the inner wall of the ship's pipeline, thereby achieving the purpose of sealing the ship's pipeline.

[0031] In order to facilitate the installation of the first airbag 4 and the second airbag 6, circular holes are respectively provided at relative positions of the first airbag 4, and the first inflation tube 5 passes through the first airbag 4 from the circular hole. The first inflation tube 5 is provided with a locking piece for sealing the circular hole at the position passing through the circular hole of the first airbag 4; circular holes are also respectively provided at relative positions of the second airbag 6, and the second inflation tube 7 passes through the second airbag 6 from the circular hole. The second inflation tube 7 is also provided with a locking piece for sealing the circular hole at the position passing through the circular hole of the second airbag 6.

[0032] More specifically, the locking member includes an annular baffle 11, an annular gasket 12, and a locking nut 13 disposed on the outer walls of the first and second inflation tubes 5 and 7. The annular baffle 11 is fixed to the outer walls of the first and second inflation tubes 5 and 7, the annular gasket 12 is sleeved on the outside of the first and second inflation tubes 5 and 7, and the locking nut 13 is threadedly connected to the outer walls of the first and second inflation tubes 5 and 7. The annular baffle 11 is located inside the first and second airbags 4 and 6, and the annular gasket 12 and locking nut 13 are disposed outside the first and second airbags 4 and 6. The locking nut 13 presses the annular gasket 12 against the circular hole from the outside, while the annular baffle 11 presses against the circular hole from the inside, thereby sealing and securing the circular holes of the first and second airbags. During installation, due to the elasticity of the first and second airbags 4 and 6, the circular holes can be stretched open and passed through the annular baffle 11.

[0033] In order to facilitate the installation of the locking nut 13 , the first inflation tube 5 and the connecting tube assembly 3 are threadedly connected, and the second inflation tube 7 and the connecting tube assembly 3 are threadedly connected.

[0034] More specifically, an external thread is provided at the position where the first inflation tube 5 is connected to the connecting tube assembly 3 , an external thread is also provided at the position where the second inflation tube 7 is connected to the connecting tube assembly 3 , and an internal thread is provided at the connecting tube assembly 3 to match the first inflation tube 5 and the second inflation tube 7 .

[0035] In order to more clearly understand the device of the utility model, the use of the device is described below:

[0036] The first airbag assembly and the second airbag assembly are respectively inserted into the two ship pipelines to be docked. The first airbag assembly and the second airbag assembly are connected by a connecting pipe assembly. The second inflation tube of the second airbag assembly can be extended by a hose so that it passes through the ship pipeline for easy connection to the air source.

[0037] Combine two ship pipelines, such as Figure 5 As shown; turn on the gas source for inflation, and the gas enters the second airbag and the first airbag along the second inflation pipe and the first inflation pipe respectively. Due to the presence of the pressure relief valve, the air pressure in the connecting pipe assembly is relatively small at this time, and the first airbag and the second airbag will expand first to block the two ship pipelines; after a period of inflation, the air pressure in the connecting pipe assembly reaches the critical value of the pressure relief valve, and the pressure relief valve opens. At this time, due to the continuous supply of gas from the gas source, the gas begins to mainly inflate the ship pipeline between the first airbag and the second airbag. When the airflow at the weld seam increases significantly, the welding operation can be started.

[0038] After welding is completed, the gas source is turned off, and the gas in the first airbag and the second airbag can be directly discharged. The first airbag and the second airbag can also be pulled out without exhausting the gas, which can clean the inner wall of the pipeline.

[0039] Experiments revealed that before using the argon arc welding auxiliary device, 22 of the 250 stainless steel pipe butt welds inspected had unqualified welds and required rework. Based on the 40 minutes it takes to weld an 89mm diameter pipe, and the standard calculation of a pipefitter's hourly rate of 20 yuan and a welder's hourly rate of 30 yuan, reworking each pipe costs 50 x 0.67 = 33 yuan. This type of ship has approximately 1,200 butt welds, requiring rework on 106 pipes, a total cost of 3,500 yuan and approximately 70 hours.

[0040] After using the above-mentioned argon arc welding auxiliary device, the above-mentioned expenses and time can be saved, and 15 minutes can be saved for each completed pipe welding. This tool is suitable for pipe diameters to For all pipes within the range, calculated as 1,200 pipes, this saves approximately 300 hours and 300 x 50 = 15,000 RMB. For the entire ship, pipe welding can save 370 hours, or approximately 20,000 RMB. This not only improves argon arc welding efficiency and quality, but also saves manpower and costs.

[0041] This embodiment is only a further explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An argon arc welding auxiliary device for ship pipelines, characterized in that: It includes a first airbag assembly, a second airbag assembly, and a connecting pipe assembly, wherein the connecting pipe assembly is connected between the first airbag assembly and the second airbag assembly; The first airbag assembly includes a first airbag and a first inflation tube connected to the first airbag; the second airbag assembly includes a second airbag and a second inflation tube connected to the second airbag; One end of the first inflation tube is blocked, the other end of the first inflation tube is connected to one end of the connecting tube assembly, one end of the second inflation tube is connected to the other end of the connecting tube assembly, and the other end of the second inflation tube is connected to an inflation gas source; The first inflation tube is provided with a first inflation port for inflating the first airbag, the second inflation tube is provided with a second inflation port for inflating the second airbag, and the connecting pipe assembly is provided with a third inflation port for inflating the ship pipeline; the first inflation port is located in the first airbag, and the second inflation port is located in the second airbag.

2. The argon arc welding auxiliary device for ship pipelines according to claim 1, characterized in that: The third inflation port is provided with a pressure relief valve, and after the pressure relief valve is opened, the third inflation port inflates air into the ship pipeline.

3. The argon arc welding auxiliary device for ship pipelines according to claim 1, characterized in that: Circular holes are respectively provided at relative positions of the first airbag, and the first inflation tube passes through the first airbag from the circular hole. The first inflation tube is provided with a locking piece for sealing the circular hole at the position where it passes through the circular hole of the first airbag; circular holes are also respectively provided at relative positions of the second airbag, and the second inflation tube passes through the second airbag from the circular hole. The second inflation tube is also provided with a locking piece for sealing the circular hole at the position where it passes through the circular hole of the second airbag.

4. The argon arc welding auxiliary device for ship pipelines according to claim 3, characterized in that: The locking member includes an annular baffle, an annular gasket and a locking nut arranged on the outer walls of the first and second inflation tubes, the annular baffle is fixed to the outer walls of the first and second inflation tubes, the annular gasket is sleeved on the outside of the first and second inflation tubes, and the locking nut is threadedly connected to the outer walls of the first and second inflation tubes; the annular baffle is located inside the first and second airbags, the annular gasket and the locking nut are arranged outside the first and second airbags, the locking nut presses the annular gasket against the circular hole from the outside, and the annular baffle presses against the circular hole from the inside.

5. The argon arc welding auxiliary device for ship pipelines according to claim 4, characterized in that: The first inflation tube is connected to the connecting tube assembly by threaded fitting, and the second inflation tube is connected to the connecting tube assembly by threaded fitting.

6. The argon arc welding auxiliary device for ship pipelines according to claim 1, characterized in that: The first airbag and the second airbag have a cylindrical shape after being inflated, and the circumferential surface of the cylindrical shape of the first airbag and the second airbag fits the inner wall of the ship pipeline.

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