A device for supplying inert gas to the inside of a weld during welding of a pipe connected to a tank

Abstract

The application discloses a kind of inert gas conveying devices in weld inside when welding tank connecting pipeline, comprising: inside protection fixed part, inside protection fixed part includes fixed inside protection support, first inside protection transmission member and first weld inside fastener, first inside protection transmission member is on fixed inside protection support, and first weld inside fastener connected is pushed;Inside protection moving part, inside protection moving part includes moving inside protection support, second inside protection transmission member and second weld inside fastener, moving inside protection support is on fixed inside protection support, and second inside protection transmission member connected is driven to slide along axial direction, and second weld inside fastener connected is driven to stretch along radial direction;Inert gas supply part.The application structure design is reasonable, and the inert gas protection effect of weld is good, significantly improves the weld quality, significantly reduces inert gas consumption and welding cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship equipment, more particularly, the present application relates to a kind of inert gas conveying device inside weld when welding tank connecting pipeline. BACKGROUND

[0002] To realize various functions, a large number of complex pipelines are connected to the tank. The pipelines are usually connected by butt welding, and the welding process is single-sided welding with double-sided forming. In this process, sufficient inert gas needs to be introduced into the inside of the weld to reduce the oxygen concentration in the air (oxygen content less than 100 ppm, i.e., one ten-thousandth), so as to reduce the degree of oxidation inside the weld and improve the weld quality.

[0003] The conventional butt welding of pipelines is to first block both ends of the pipe, then introduce argon gas through a small hole at one end, and detect the oxygen content of the exhaust gas through an exhaust hole at the other end. Because the internal space of the pipeline is small and the density of argon gas is greater than that of air, argon gas is easily accumulated, so the gas in the pipeline is quickly replaced by argon gas. The oxygen concentration in the exhaust gas also decreases with the increase of argon concentration in the pipeline. When the exhaust gas meets the requirements, welding can be performed. This method is suitable for pipelines with short distance between both ends and small diameter. When the pipeline at one end of the weld is long or connected to the tank, a large amount of argon gas is needed, which is extremely costly.

[0004] The final seam welding of the pipeline connecting the vacuum insulated tank is the weld between the tank outlet pipe and the external pipeline (e.g., the weld between the tank outlet pipe and the external pipeline in the figure). Figure 1 When welding this weld, gas can only be introduced from one side, and the other side cannot be sealed because people cannot enter the tank. Therefore, if the air in the pipeline is replaced by argon gas, the air in the tank will also be replaced, which requires a large amount of argon gas and is extremely costly. Some manufacturers then use nitrogen gas instead of argon gas for testing, which can also provide some protection, but the protection effect is still not comparable to that of argon gas. It usually takes 3-5 days to reduce the oxygen concentration to 100 ppm for a 100 m³ tank, which is not only economically unreasonable, but also very time-consuming. SUMMARY

[0005] In order to overcome the above-mentioned defects, the present application provides a kind of inert gas conveying device inside weld when welding tank connecting pipeline, specifically using the following technical solutions:

[0006] An inert gas conveying device inside weld when welding tank connecting pipeline, comprising:

[0007] The inner side protection fixed part comprises a fixed inner side protection support, a first inner side protection transmission part and a first inner side weld seam clamping part. The first inner side protection transmission part is on the fixed inner side protection support and pushes the connected first inner side weld seam clamping part to expand or contract radially.

[0008] The inner side protection moving part is arranged on the inner side protection fixed part. The inner side protection moving part comprises a moving inner side protection support, a second inner side protection transmission part and a second inner side weld seam clamping part. The moving inner side protection support is on the fixed inner side protection support and drives the connected second inner side protection transmission part to slide axially. The second inner side protection transmission part drives the connected second inner side weld seam clamping part to expand or contract radially. The first inner side weld seam clamping part and the second inner side weld seam clamping part are matched to protect the inner side of the weld seam circumferentially.

[0009] The inert gas supply part is connected to the inner side protection fixed part and the inner side protection moving part simultaneously to supply inert gas to the first inner side weld seam clamping part and the second inner side weld seam clamping part simultaneously.

[0010] Preferably, the fixed inner side protection support comprises a fixed inner side protection support tube. One end of the fixed inner side protection support tube is closed to provide support for the first inner side protection transmission part.

[0011] Preferably, the first inner side protection transmission part comprises a first inner side protection transmission support and a first inner side protection transmission power part. The first inner side protection transmission support is arranged on the fixed inner side protection support tube. The first inner side protection transmission power part is arranged on the first inner side protection transmission support.

[0012] Preferably, the first inner side protection transmission support comprises a transmission support fixed tube, a guide ring and a transmission support moving tube. One end of the transmission support fixed tube is arranged on the side wall of one end of the fixed inner side protection support tube. The guide ring is embedded in the other end of the transmission support fixed tube. The transmission support moving tube extends into the transmission support fixed tube after sliding axially through the inner ring of the guide ring.

[0013] Preferably, the first inner protective transmission power component includes a guide sealing ring, a magnetic coil, and a return spring. The guide sealing ring is fixedly fitted onto one end of the transmission support moving tube and slidably embedded in the transmission support fixed tube. The magnetic coil is embedded in an annular groove inside one end of the transmission support fixed tube. The return spring is sleeved outside one end of the transmission support moving tube, with one end connected to the guide ring and the other end connected to the guide sealing ring. Multiple sets of the first inner protective transmission components are evenly distributed around the fixed inner protective support tube.

[0014] Preferably, the first weld inner fastening component includes an inner fastening groove, which is in the shape of an arc groove, and the bottom surface of the inner fastening groove is disposed through the other end of the transmission support moving tube; multiple sets of the first weld inner fastening components correspond one-to-one with multiple sets of the first inner protective transmission components.

[0015] Preferably, the movable inner protective support includes a movable inner protective support tube, one end of which is closed, and one end of which is axially slidably embedded in the other end of the fixed inner protective support tube.

[0016] Preferably, the second inner protective transmission component has the same structure as the first inner protective transmission component. One end of the transmission support fixing tube of the second inner protective transmission component passes through the sliding through hole on the wall of the fixed inner protective support tube, and the other end of the transmission support fixing tube of the second inner protective transmission component is disposed through the movable inner protective support tube. Multiple sets of the second inner protective transmission components are evenly distributed around the movable inner protective support tube, and the multiple sets of the second inner protective transmission components and the multiple sets of the first inner protective transmission components are distributed at intervals along the circumference.

[0017] Preferably, the second weld inner side fastening component has the same structure as the first weld inner side fastening component, and multiple sets of the second weld inner side fastening components are sequentially and correspondingly installed on multiple sets of the second inner side protection transmission components. Furthermore, the connection relationship between the second weld inner side fastening component and the second inner side protection transmission component is the same as the connection relationship between the first weld inner side fastening component and the first inner side protection transmission component.

[0018] Preferably, the inert gas supply component includes an inert gas source component and an inert gas relay component. The inert gas source component supplies inert gas to the movable inner protective support pipe that it penetrates and connects to. The inert gas relay component is simultaneously connected to both the inner protective movable component and the inner protective fixed component. The inert gas relay component includes a four-way pipe, a telescopic pipe, and a relay pipe. Three ports of the four-way pipe are all connected to one end sidewall of the fixed inner protective support pipe. One end of the telescopic pipe is connected to the fourth port of the four-way pipe, and the other end of the telescopic pipe is connected to one end face of the movable inner protective support pipe. One end of the relay pipe is connected to one port of the four-way pipe, and the other end of the relay pipe is connected to one end sidewall of the transmission support fixed pipe. The three relay pipes are connected to the three ports of the four-way pipe and the three transmission support fixed pipes one by one.

[0019] The present invention has at least the following beneficial effects:

[0020] 1) The inert gas conveying device inside the weld seam during the welding of the tank connecting pipe of the present invention has a reasonable structural design, good inert gas protection effect on the weld seam, significantly improves the weld seam quality, and significantly reduces the consumption of inert gas and welding cost;

[0021] 2) The inert gas delivery device for the inner side of the weld seam during the welding of the tank body connecting the pipeline of the present invention is equipped with a fixed inner protective support, a first inner protective transmission component, a first weld seam inner fastening component, a movable inner protective support, a second inner protective transmission component, and a second weld seam inner fastening component. The first inner protective transmission component, on the fixed inner protective support, pushes the connected first weld seam inner fastening component to extend and retract radially. The movable inner protective support, on the fixed inner protective support, drives the connected second inner protective transmission component to slide axially. The second inner protective transmission component drives the connected second weld seam inner fastening component to extend and retract radially. By cooperating with the first weld seam inner fastening component, inert gas protection is provided circumferentially to the inner side of the weld seam. This significantly improves the inert gas protection performance and weld quality of the inner side of the weld seam, and significantly reduces the inert gas consumption and welding cost.

[0022] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0023] Figure 1 This is a front view of the inert gas conveying device inside the weld seam during the welding of the tank connecting pipes of the present invention.

[0024] Figure 2This is a front view of the inert gas conveying device inside the weld seam during the welding of the tank connecting pipes according to the present invention;

[0025] Figure 3 This is a three-dimensional structural diagram of the left side of the inert gas conveying device inside the weld seam during the welding of the tank connecting pipes of the present invention;

[0026] Figure 4 This is a three-dimensional structural diagram of the right side of the inert gas conveying device inside the weld seam during the welding of the tank connecting pipes of the present invention;

[0027] Figure 5 This invention relates to an inert gas delivery device for the inner side of the weld seam during the welding of pipes connecting the tank body. Figure 1 Schematic diagram of the three-dimensional structure on the left side of the cross-section along the AA direction;

[0028] Figure 6 This invention relates to an inert gas delivery device for the inner side of the weld seam during the welding of pipes connecting the tank body. Figure 5 A magnified view of part B in the image;

[0029] Figure 7 This invention relates to an inert gas delivery device for the inner side of the weld seam during the welding of pipes connecting the tank body. Figure 1 A schematic diagram of the three-dimensional structure on the right side of the cross-section along the AA direction.

[0030] Among them: 1-fixed inner protective support tube, 2-transmission support fixed tube, 3-guide ring, 4-transmission support moving tube, 5-guide sealing ring, 6-magnetic coil, 7-reset spring, 8-sealing ring, 9-inner fastening groove, 10-axial positioning plate, 11-moving inner protective support tube, 12-sliding through hole, 13-second inner protective transmission component, 14-second weld inner fastening component, 15-four-way pipe, 16-telescopic air pipe, 17-relay air pipe. Detailed Implementation

[0031] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and by way of embodiments. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0032] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this article describes another type of relationship between related objects, indicating that two relationships can exist. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the related objects before and after it are in an "or" relationship.

[0033] according to Figures 1-7As shown, an inert gas delivery device for the inner side of the weld seam during tank-connecting pipe welding includes an inner protective fixing component, an inner protective moving component, and an inert gas supply component. The inner protective moving component is disposed on the inner protective fixing component, and the inert gas supply component is connected to the inner protective moving component.

[0034] The inner protective fastener includes a fixed inner protective support, a first inner protective transmission component, and a first weld seam inner fastener. The first inner protective transmission component is mounted on the fixed inner protective support, and the first weld seam inner fastener is mounted on the first inner protective transmission component. The fixed inner protective support includes a fixed inner protective support tube 1, which is tubular and has one closed end face to provide support for the first inner protective transmission component.

[0035] The first inner protection transmission component includes a first inner protection transmission support component and a first inner protection transmission power component. The first inner protection transmission support component is disposed on the fixed inner protection support tube 1, and the first inner protection transmission power component is disposed on the first inner protection transmission support component.

[0036] The first inner protective transmission support component includes a transmission support fixed tube 2, a guide ring 3, and a transmission support movable tube 4. One end of the transmission support fixed tube 2 is fixedly mounted on the side wall of one end of the fixed inner protective support tube 1, and the axis of the transmission support fixed tube 2 coincides with a radial line of the fixed inner protective support tube 1. The guide ring 3 is in the shape of a circular ring plate, and its outer wall is fixedly embedded in the other end of the transmission support fixed tube 2, with its axis coinciding with the axis of the transmission support fixed tube 2. The transmission support movable tube 4 is tubular, and its outer diameter is not greater than the inner diameter of the transmission support fixed tube 2. The transmission support movable tube 4 slides axially through the inner ring of the guide ring 3 and extends into the transmission support fixed tube 2. By cooperating with the first inner protective transmission power component, the transmission support movable tube 4 slides axially back and forth within the transmission support fixed tube 2.

[0037] The first inner protective transmission power component includes a guide sealing ring 5, a magnetic coil 6, and a return spring 7. The guide sealing ring 5 is in the shape of a circular annular plate. The outer diameter of the guide sealing ring 5 is not greater than the inner diameter of the transmission support fixed tube 2, and the inner diameter of the guide sealing ring 5 is not less than the outer diameter of the transmission support moving tube 4. The guide sealing ring 5 is fixedly fitted onto one end of the transmission support moving tube 4 and is slidably embedded in the transmission support fixed tube 2. Furthermore, a circular groove is provided on the outer wall of the guide sealing ring 5, and a sealing ring 8 is provided in the circular groove. The sealing ring 8 can improve the sealing performance of the guide sealing ring 5 during axial sliding within the transmission support fixed tube 2. The magnetic coil 6 is fixedly embedded in the circular groove inside one end of the transmission support fixed tube 2. It should be noted that the sealing performance of the sealing ring 8 mainly plays a sealing role when the guide sealing ring 5 slides to the other end of the transmission support fixed tube 2, facilitating the delivery of argon gas from the transmission support fixed tube 2 to the transmission support moving tube 4. When located inside one end of the transmission support fixed tube 2, no sealing is required. The return spring 7 is a tension spring, which is sleeved outside one end of the transmission support moving tube 4, with one end connected to the guide ring 3 and the other end connected to the guide sealing ring 5.

[0038] Furthermore, three sets of the first inner protective transmission components are provided, and the three sets of the first inner protective transmission components are evenly distributed around the fixed inner protective support tube 1 in a circumferential direction.

[0039] The first weld seam inner fastening component includes an inner fastening groove 9, which is arc-shaped and has a central angle of 60 degrees. The bottom surface of the inner fastening groove is fixedly disposed on the other end of the transmission support moving pipe 4.

[0040] Alternatively, axial positioning plates 10 are provided at both ends of one side wall of the inner fastening groove 9 to provide axial positioning when the inner fastening groove of the second weld inner fastening member 14 moves and closes with the inner fastening groove 9 along the axial direction, thereby improving the degree of fit between the inner fastening groove of the second weld inner fastening member 14 and the inner fastening groove 9.

[0041] Furthermore, three sets of the first weld seam inner fastening components are provided, and the three sets of the first weld seam inner fastening components correspond one-to-one with the three sets of the first inner protective transmission components.

[0042] It should be noted that when the inert gas delivery device inside the weld seam is moved to the inside of the weld seam during the welding of the tank connecting pipe, a direct current is supplied to the magnetic coil 6 to generate a magnetic field, which pulls the guide sealing ring 5 to one end of the transmission support fixing tube 2. The moving guide sealing ring 5 pulls the transmission support moving tube 4 to retract into the transmission support fixing tube 2 to reduce the radial radius, making it easier to insert into the tube and deliver it to the predetermined weld seam. After being delivered to the predetermined weld seam, the input of direct current is stopped, and the reset spring 7 will push the transmission support moving tube 4 to move outward, thereby causing the inner fastening groove to fasten onto the inner wall of the weld seam of the pipe to be welded. Then, argon gas enters the inner fastening groove 9 through the transmission support moving tube 4 to provide inert gas protection for the inner wall of the weld seam.

[0043] The inner protective moving component includes a movable inner protective support, a second inner protective transmission component 13, and a second weld inner fastening component 14. The second inner protective transmission component 13 is disposed on the movable inner protective support, and the second weld inner fastening component 14 is disposed on the second inner protective transmission component 13. The movable inner protective support includes a movable inner protective support tube 11, which is tubular. One end of the movable inner protective support tube 11 is closed, and one end of the movable inner protective support tube 11 is axially slidably embedded in the other end of the fixed inner protective support tube 1.

[0044] The second inner protective transmission component 13 has the same structure as the first inner protective transmission component. One end of the transmission support fixing tube 2 of the second inner protective transmission component 13 passes through the sliding through hole 12 on the wall of the fixed inner protective support tube, and the other end of the transmission support fixing tube 2 of the second inner protective transmission component 13 is fixedly disposed on the movable inner protective support tube 11. Further, the sliding through hole 12 is in the shape of an elongated through hole, and the longitudinal line of the sliding through hole 12 is parallel to the axis of the fixed inner protective support tube 1. Three sets of the second inner protective transmission component 13 are provided, and the three sets of the second inner protective transmission component 13 are evenly distributed around the movable inner protective support tube 11 in the circumferential direction, and the three sets of the second inner protective transmission component 13 are spaced apart from the three sets of the first inner protective transmission component in the circumferential direction.

[0045] The second weld inner side fastening member 14 has the same structure as the first weld inner side fastening member. The three sets of the second weld inner side fastening members 14 are respectively set on the three sets of the second inner side protection transmission members 13. The connection relationship between the second weld inner side fastening member 14 and the second inner side protection transmission member 13 is the same as the connection relationship between the first weld inner side fastening member and the first inner side protection transmission member.

[0046] It should be noted that when the inner fastening groove 9 is sent into the predetermined position inside the weld, the movable inner protection support tube 11 is pushed to the left along the axial direction. The movable inner protection support tube 11 will drive the inner fastening groove of the second weld inner fastening member 14 to close with the inner fastening groove 9 along the axial direction through the second inner protection transmission member 13, thereby realizing complete fastening of the inner circumferential side of the weld. Then, argon gas is simultaneously supplied to the inner fastening groove 9 and the inner fastening groove of the second weld inner fastening member 14 through the inert gas supply member to provide sufficient inert gas protection for the inner side of the weld.

[0047] The inert gas supply component includes an inert gas source component and an inert gas relay component. The inert gas source component is connected to the inner protective moving component, and the inert gas relay component is connected to both the inner protective moving component and the inner protective fixing component.

[0048] The inert gas source component includes an inert gas source cylinder and a gas delivery pipe. One end of the gas delivery pipe is connected to the inert gas source cylinder, and the other end of the gas delivery pipe is connected to the other end of the movable inner protective support pipe 11, for supplying inert gas to the movable inner protective support pipe 11.

[0049] The inert gas relay component includes a four-way pipe 15, a telescopic gas pipe 16, and a relay gas pipe 17. Three ports of the four-way pipe 15 are connected to one end of the side wall of the fixed inner protective support pipe 1. One end of the telescopic gas pipe 16 is connected to the fourth port of the four-way pipe 15, and the other end of the telescopic gas pipe 16 is connected to one end of the movable inner protective support pipe 11. Alternatively, the telescopic gas pipe 16 can be a spring-loaded gas pipe. One end of the relay gas pipe 17 is connected to one port of the four-way pipe 15, and the other end of the relay gas pipe 17 is connected to one end of the side wall of the transmission support fixed pipe 2. The three relay gas pipes 17 are connected one-to-one to the three ports of the four-way pipe 15 and the three transmission support fixed pipes 2. This allows the inert gas inside the movable inner protective support tube 11 to simultaneously enter the second weld inner fastening member 14 via the second inner protective transmission member 13, and simultaneously enter the inner fastening groove 9 via the inert gas relay member to provide inert gas protection for the inner circumferential direction of the weld.

[0050] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A device for conveying inert gas inside the weld seam during the welding of pipes connecting tanks, characterized in that, include: An inner protective fastener, comprising a fixed inner protective support, a first inner protective transmission component, and a first weld inner fastener, wherein the first inner protective transmission component, on the fixed inner protective support, pushes the connected first weld inner fastener to extend and retract radially; An inner protective movable component is disposed on the inner protective fixed component. The inner protective movable component includes a movable inner protective support component, a second inner protective transmission component, and a second weld inner fastening component. The movable inner protective support component is on the fixed inner protective support component and drives the connected second inner protective transmission component to slide axially. The second inner protective transmission component drives the connected second weld inner fastening component to extend and retract radially. By cooperating with the first weld inner fastening component, inert gas protection is provided for the circumferential inner surface of the weld. An inert gas supply component is simultaneously connected to the inner protective fixing component and the inner protective moving component to simultaneously supply inert gas to the first weld inner fastening component and the second weld inner fastening component. The fixed inner protective support includes a fixed inner protective support tube, and the first inner protective transmission component includes a first inner protective transmission support and a first inner protective transmission power component. The first inner protective transmission support includes a transmission support fixed tube, a guide ring, and a transmission support movable tube. One end of the transmission support fixed tube is disposed on the side wall of one end of the fixed inner protective support tube, the guide ring is embedded in the other end of the transmission support fixed tube, and the transmission support movable tube slides axially through the inner ring of the guide ring and extends into the transmission support fixed tube. The first weld inner fastening component includes an inner fastening groove, which is arc-shaped. The bottom surface of the inner fastening groove is disposed through the other end of the transmission support moving tube. The movable inner protective support component includes a movable inner protective support tube. The second inner protective transmission component has the same structure as the first inner protective transmission component. One end of the transmission support fixing tube of the second inner protective transmission component passes through a sliding through hole on the wall of the fixed inner protective support tube. The other end of the transmission support fixing tube of the second inner protective transmission component is disposed through the movable inner protective support tube. The second weld inner fastening component has the same structure as the first weld inner fastening component. The inert gas supply component includes an inert gas source component and an inert gas relay component. The inert gas source component supplies inert gas to the movable inner protective support pipe that it penetrates. The inert gas relay component is simultaneously connected to the inner protective movable component and the inner protective fixed component. The inert gas relay component includes a four-way pipe, a telescopic gas pipe, and a relay gas pipe. The three ports of the four-way pipe are all connected to one end sidewall of the fixed inner protective support pipe. One end of the telescopic gas pipe is connected to the fourth port of the four-way pipe, and the other end of the telescopic gas pipe is connected to one end face of the movable inner protective support pipe. One end of the relay gas pipe is connected to one port of the four-way pipe, and the other end of the relay gas pipe is connected to one end sidewall of the transmission support fixed pipe. The three relay gas pipes are connected to the three ports of the four-way pipe and the three transmission support fixed pipes one by one.

2. The inert gas conveying device for the inner side of the weld seam during tank body connecting pipe welding according to claim 1, characterized in that, One end of the fixed inner protective support tube is closed, providing support for the first inner protective transmission component.

3. The inert gas conveying device for the inner side of the weld seam during tank body connecting pipe welding according to claim 2, characterized in that, The first inner protective transmission support is mounted on the fixed inner protective support tube, and the first inner protective transmission power component is mounted on the first inner protective transmission support.

4. The inert gas conveying device for the inner side of the weld seam during tank body connecting pipe welding according to claim 3, characterized in that, The first inner protective transmission power component includes a guide sealing ring, a magnetic coil, and a return spring. The guide sealing ring is fixedly fitted onto one end of the transmission support moving tube and is slidably embedded in the transmission support fixed tube. The magnetic coil is embedded in an annular groove inside one end of the transmission support fixed tube. The return spring is sleeved on the outside of one end of the transmission support moving tube, with one end connected to the guide ring and the other end connected to the guide sealing ring. Multiple sets of the first inner protective transmission components are evenly distributed around the fixed inner protective support tube.

5. The inert gas conveying device for the inner side of the weld seam during tank body connecting pipe welding according to claim 4, characterized in that, Multiple sets of the first weld inner side fastening parts correspond one-to-one with multiple sets of the first inner side protective transmission parts.

6. The inert gas conveying device for the inner side of the weld seam during tank body connecting pipe welding according to claim 5, characterized in that, One end of the movable inner protective support tube is closed, and one end of the movable inner protective support tube is axially slidably embedded in the other end of the fixed inner protective support tube.

7. The inert gas conveying device for the inner side of the weld seam during tank body connecting pipe welding according to claim 6, characterized in that, Multiple sets of second inner protective transmission components are evenly distributed around the movable inner protective support tube in the circumference, and the multiple sets of second inner protective transmission components and multiple sets of first inner protective transmission components are distributed at intervals in the circumference.

8. The inert gas conveying device for the inner side of the weld seam during tank body connecting pipe welding according to claim 7, characterized in that, Multiple sets of second weld inner side fastening components are sequentially and correspondingly installed on multiple sets of second inner side protection transmission components, and the connection relationship between the second weld inner side fastening component and the second inner side protection transmission component is the same as the connection relationship between the first weld inner side fastening component and the first inner side protection transmission component.

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