Device for conveying inert gas on inner side of welding seam during welding of tank connecting pipeline

Abstract

The invention discloses a welding seam inner side inert gas conveying device during tank body connecting pipeline welding, which comprises an inner side protection fixing piece, a first inner side protection transmission piece and a first welding seam inner side buckling piece, the inner side protection fixing piece comprises a fixed inner side protection supporting piece, a first inner side protection transmission piece and a first welding seam inner side buckling piece, the first inner side protection transmission piece is arranged on the fixed inner side protection supporting piece, and the first welding seam inner side buckling piece is arranged on the first inner side protection transmission piece; the connected first welding seam inner side buckling piece is pushed; the inner side protection moving part comprises a movable inner side protection supporting part, a second inner side protection transmission part and a second welding seam inner side buckling part, and the movable inner side protection supporting part is arranged on the fixed inner side protection supporting part and drives the second inner side protection transmission part connected with the movable inner side protection supporting part to slide in the axial direction; the second inner side protection transmission piece drives the connected second welding seam inner side buckling piece to stretch out and draw back in the radial direction; and an inert gas supply member. The device is reasonable in structural design and good in inert gas protection effect on welding seams, the welding seam quality is remarkably improved, and the inert gas consumption and the welding cost are remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ship equipment, and more specifically to a device for conveying inert gas inside a weld when welding a tank body connecting a pipeline. Background Art

[0002] In order to realize various functions of storage tanks, there will be a large number of complex pipes connected to the tank body. Most of the pipes are connected by butt welding, and the welding is carried out by single-sided welding and double-sided forming. This welding process requires sufficient inert gas to be introduced into the inside of the weld to reduce the oxygen concentration in the air (oxygen content is less than 100ppm, i.e. one ten-thousandth), thereby reducing the degree of oxidation inside the weld and improving the quality of the weld.

[0003] The conventional method of butt welding of pipelines is to seal both ends of the pipe first, open a small hole at one end to let in argon gas, and open an exhaust hole on the other end to detect the oxygen content of the exhaust gas. Since the internal space of the pipeline is small and the density of argon is greater than that of air and it is easy to accumulate, the gas in the pipeline will be quickly replaced by argon. The oxygen concentration in the exhaust gas will also decrease as the argon concentration in the pipeline increases. Welding can only be carried out when the exhaust gas meets the requirements. This method is suitable for when the distance between the two ends of the weld pipe is short and the pipe diameter is small. When the pipe at one end of the weld is very long or the pipe at one end is connected to the tank, a large amount of argon gas is required, which is extremely costly.

[0004] The final closure seam weld of the pipe connected to the vacuum insulated storage tank body refers to the weld connecting the tank outlet pipe and the external pipeline (such as Figure 1 ), when welding this weld, ventilation can only be carried out from one side, and the other side cannot be separated and sealed because people cannot enter the tank. Therefore, if the air in the pipeline is replaced with argon, the air in the tank will be replaced together, which requires a large amount of argon and is extremely expensive. Later, some manufacturers only tested nitrogen instead of argon. Although it can also play a certain protective role, the protective effect is still not comparable to argon. Moreover, a storage tank of about 100m3 usually needs to be replaced for 3-5 days to reduce the oxygen concentration to 100ppm, which is not only economically unreasonable, but also has a low timeliness. Summary of the invention

[0005] In order to overcome the above-mentioned defects, the present invention provides an inert gas delivery device inside the weld when the tank body is connected to the pipeline for welding, which specifically adopts the following technical solutions:

[0006] An inert gas delivery device for the inner side of a weld when welding a tank body to a pipeline, comprising:

[0007] An inner protection fixing member, the inner protection fixing member comprising a fixed inner protection support member, a first inner protection transmission member and a first weld inner buckle member, the first inner protection transmission member is on the fixed inner protection support member, and pushes the connected first weld inner buckle member to expand and contract radially;

[0008] An inner protection moving part, which is arranged on the inner protection fixing part, and the inner protection moving part includes a moving inner protection supporting part, a second inner protection transmission part and a second weld inner buckle part. The moving inner protection supporting part is on the fixed inner protection supporting part, driving the connected second inner protection transmission part to slide axially, and the second inner protection transmission part drives the connected second weld inner buckle part to expand and contract radially, and cooperates with the first weld inner buckle part to perform inert gas protection on the inner side surface of the weld in the circumferential direction;

[0009] The inert gas supply component is connected to the inner protection fixing component and the inner protection moving component at the same time, so as to simultaneously deliver inert gas to the first weld inner buckle component and the second weld inner buckle component.

[0010] Preferably, the fixed inner protection support member comprises a fixed inner protection support tube, one end face of the fixed inner protection support tube is closed, and provides support for the first inner protection transmission member.

[0011] Preferably, the first inner protection transmission member includes a first inner protection transmission support member and a first inner protection transmission power member, the first inner protection transmission support member is arranged on the fixed inner protection support tube, and the first inner protection transmission power member is arranged on the first inner protection transmission support member.

[0012] Preferably, the first inner protection transmission support member includes a transmission support fixed tube, a guide ring and a transmission support movable tube, one end of the transmission support fixed tube is arranged on the side wall of one end of the fixed inner protection support tube, the guide ring is embedded in the other end of the transmission support fixed tube, and the transmission support movable tube axially slides through the inner ring of the guide ring and then extends into the transmission support fixed tube.

[0013] Preferably, the first inner protection transmission power component includes a guide sealing ring, a magnetic coil and a return spring, the guide sealing ring is fixedly sleeved on one end of the transmission support movable tube, and the guide sealing ring is slidably embedded in the transmission support fixed tube; the magnetic coil is embedded in an annular groove in the tube at one end of the transmission support fixed tube; the return spring is sleeved on the outside of the transmission support movable tube at one end, and one end of the return spring is connected to the guide ring, and the other end of the return spring is connected to the guide sealing ring; multiple sets of the first inner protection transmission components are evenly distributed around the fixed inner protection support tube.

[0014] Preferably, the first weld inner side buckle member includes an inner side buckle groove, the inner side buckle groove is in the shape of an arc groove, and the bottom surface of the inner side fixed buckle groove is through-set on the other end of the transmission support movable tube; multiple sets of the first weld inner side buckle members correspond one by one to multiple sets of the first inner side protection transmission members.

[0015] Preferably, the movable inner protection support member comprises a movable inner protection support tube, one end face of the movable inner protection support tube is closed, and one end of the movable inner protection support tube is axially slidably embedded in the other end of the fixed inner protection support tube.

[0016] Preferably, the second inner protection transmission member has the same structure as the first inner protection transmission member, and after one end of the transmission support fixed tube of the second inner protection transmission member passes through the sliding through hole on the wall of the movable inner protection support tube, one end of the transmission support fixed tube of the second inner protection transmission member is set on the movable inner protection support tube; multiple sets of the second inner protection transmission members are evenly distributed around the movable inner protection support tube, and multiple sets of the second inner protection transmission members and multiple sets of the first inner protection transmission members are spaced apart along the circumference.

[0017] Preferably, the second weld inner side buckle has the same structure as the first weld inner side buckle, multiple sets of the second weld inner side buckle are arranged one by one on multiple sets of the second inner side protection transmission parts, and the connection relationship between the second weld inner side buckle and the second inner side protection transmission part is the same as the connection relationship between the first weld inner side buckle and the first inner side protection transmission part.

[0018] Preferably, the inert gas supply component includes an inert gas source component and an inert gas relay component, the inert gas source component transports inert gas to the movable inner protection support tube connected thereto, and the inert gas relay component is simultaneously connected to the inner protection movable component and the inner protection fixed component; the inert gas relay component includes a four-way tube, a telescopic air pipe and a relay air pipe, the three ports of the four-way tube are all connected to the side wall of one end of the fixed inner protection support tube, one end of the telescopic air pipe is connected to the fourth port of the four-way tube, and the other end of the telescopic air pipe is connected to an end face of the movable inner protection support tube; one end of the relay air pipe is connected to a port of the four-way tube, and the other end of the relay air pipe is connected to the side wall of one end of the transmission support fixed tube; the three relay air pipes are connected to the three ports of the four-way tube and the three transmission support fixed tubes one by one.

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

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

[0021] 2) When welding the tank body connection pipeline of the present invention, the inert gas conveying device inside the weld is provided with a fixed inner protection support, a first inner protection transmission member, a first weld inner buckle member, a movable inner protection support member, a second inner protection transmission member and a second weld inner buckle member. The first inner protection transmission member is on the fixed inner protection support member, pushing the connected first weld inner buckle member to expand and contract radially; the movable inner protection support member is on the fixed inner protection support member, driving the connected second inner protection transmission member to slide axially; the second inner protection transmission member drives the connected second weld inner buckle member to expand and contract radially, and cooperates with the first weld inner buckle member to perform inert gas protection on the circumference of the inner side of the weld; the inert gas protection performance of the inner side of the weld and the weld quality are significantly improved, and the inert gas consumption and welding cost are significantly reduced.

[0022] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a front view of the inert gas delivery device on the inner side of the weld when the tank body is connected to the pipeline during welding;

[0024] Figure 2This is a front view of the inert gas delivery device inside the weld when the tank body is connected to the pipeline during welding;

[0025] Figure 3 It is a schematic diagram of the left three-dimensional structure of the inert gas delivery device on the inner side of the weld when the tank body is connected to the pipeline during welding of the present invention;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the right side of the inert gas delivery device on the inner side of the weld when the tank body is connected to the pipeline during welding of the present invention;

[0027] Figure 5 The inert gas delivery device for the inner side of the weld when the tank body is connected to the pipeline during welding of the tank body of the present invention Figure 1 Schematic diagram of the three-dimensional structure on the left side of the section in the AA direction;

[0028] Figure 6 The inert gas delivery device for the inner side of the weld when the tank body is connected to the pipeline during welding of the tank body of the present invention Figure 5 A partial enlarged view of B in the middle;

[0029] Figure 7 The inert gas delivery device for the inner side of the weld when the tank body is connected to the pipeline during welding of the tank body of the present invention Figure 1 Schematic diagram of the three-dimensional structure on the right side of the section along the AA direction.

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

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

[0032] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. 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 previous and next associated objects are in an "or" relationship.

[0033] according to Figure 1-Figure 7As shown, an inert gas conveying device for the inner side of the weld when welding a tank body to a pipeline comprises an inner side protection fixing member, an inner side protection moving member and an inert gas supply member, wherein the inner side protection moving member is arranged on the inner side protection fixing member, and the inert gas supply member is connected to the inner side protection moving member.

[0034] The inner protection fixing member includes a fixed inner protection support member, a first inner protection transmission member and a first weld inner buckle member, the first inner protection transmission member is arranged on the fixed inner protection support member, and the first weld inner buckle member is arranged on the first inner protection transmission member. The fixed inner protection support member includes a fixed inner protection support tube 1, the fixed inner protection support tube 1 is tubular, one end face of the fixed inner protection support tube 1 is closed, and provides support for the first inner protection transmission member.

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

[0036] The first inner protection transmission support member 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 arranged on the side wall of one end of the fixed inner protection support tube 1, and the axis of the transmission support fixed tube 2 coincides with a radial line of the fixed inner protection support tube 1. The guide ring 3 is in the shape of a circular ring plate, and the outer wall of the guide ring 3 is fixedly embedded in the pipe opening at the other end of the transmission support fixed tube 2, and the axis of the guide ring 3 coincides with the axis of the transmission support fixed tube 2. The transmission support movable tube 4 is in the shape of a tube, and the outer diameter of the transmission support movable tube 4 is not greater than the inner diameter of the transmission support fixed tube 2. The transmission support movable tube 4 axially slides through the inner ring of the guide ring 3 and then extends into the transmission support fixed tube 2. By cooperating with the first inner protection transmission power member, the transmission support movable tube 4 slides back and forth axially in the transmission support fixed tube 2.

[0037] The first inner side protection transmission power part includes a guide sealing ring 5, a magnetic coil 6 and a reset spring 7. The guide sealing ring 5 is in the shape of a circular ring plate. The outer ring diameter of the guide sealing ring 5 is not greater than the inner diameter of the transmission support fixed tube 2, and the inner ring diameter of the guide sealing ring 5 is not less than the outer diameter of the transmission support movable tube 4. The guide sealing ring 5 is fixedly sleeved on one end of the transmission support movable tube 4, and the guide sealing ring 5 is slidably embedded in the transmission support fixed tube 2. Further, a circular ring groove is provided on the outer ring wall of the guide sealing ring 5, and a sealing ring 8 is provided in the annular groove. The sealing ring 8 can improve the sealing performance of the guide sealing ring 5 during the axial sliding process in the transmission support fixed tube 2. The magnetic coil 6 is fixedly embedded in the annular groove in 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, so as to facilitate the transportation of argon from the transmission support fixed tube 2 to the transmission support movable tube 4. When it is located inside the transmission support fixed tube 2, no sealing effect is required. The return spring 7 is a tension spring, which is sleeved outside the transmission support movable tube 4, and one end of the return spring 7 is connected to the guide ring 3, and the other end of the return spring 7 is connected to the guide sealing ring 5.

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

[0039] The first weld inner buckle member comprises an inner buckle groove 9, which is in the shape of an arc groove and has a central angle of 60 degrees. The inner fixed buckle groove bottom surface is fixedly connected to the other end of the transmission support moving tube 4.

[0040] As an option, axial positioning plates 10 are provided at both ends of the groove wall on one side of the inner buckle groove 9 to play an axial positioning role when the inner buckle groove of the second weld inner buckle piece 14 moves and closes with the inner buckle groove 9 along the axial direction, thereby improving the degree of fit between the inner buckle groove of the second weld inner buckle piece 14 and the inner buckle groove 9.

[0041] Furthermore, three sets of the first weld inner side buckling parts are provided, and the three sets of the first weld inner side buckling parts correspond to the three sets of the first inner side protection transmission parts one by one.

[0042] It should be noted that when the inert gas conveying device on the inside of the weld needs to be moved to the inside of the weld in the pipeline when welding the tank body connection pipeline, direct current is passed into the magnetic coil 6 to generate a magnetic field to pull the guide sealing ring 5 to move to one end of the transmission support fixed tube 2, and the moving guide sealing ring 5 pulls the transmission support movable tube 4 to shrink into the transmission support fixed tube 2 to reduce the radial radius, so as to facilitate insertion into the tube and send it to the predetermined weld; after it is sent to the predetermined weld, stop inputting direct current, and the reset spring 7 will push the transmission support movable tube 4 to move outward, thereby driving the inner fixed buckle groove to be buckled on the inner wall of the weld of the pipeline to be welded, and then argon gas enters the inner buckle groove 9 through the transmission support movable tube 4 to provide inert gas protection for the inner wall of the weld.

[0043] The inner protection moving member includes a moving inner protection support member, a second inner protection transmission member 13 and a second weld inner buckle member 14, wherein the second inner protection transmission member 13 is arranged on the moving inner protection support member, and the second weld inner buckle member 14 is arranged on the second inner protection transmission member 13. The moving inner protection support member includes a moving inner protection support tube 11, which is tubular, has one end face closed, and one end of the moving inner protection support tube 11 is axially slidably embedded in the other end of the fixed inner protection support tube 1.

[0044] The second inner protection transmission member 13 has the same structure as the first inner protection transmission member. After one end of the transmission support fixed tube 2 of the second inner protection transmission member 13 passes through the sliding through hole 12 on the wall of the movable inner protection support tube 11, one end of the transmission support fixed tube 2 of the second inner protection transmission member 13 is fixedly set on the movable inner protection support tube 11. Furthermore, the sliding through hole 12 is in the shape of a long through hole, and the longitudinal line of the sliding through hole 12 is parallel to the axis of the fixed inner protection support tube 1. The second inner protection transmission member 13 is provided with three sets, and the three sets of the second inner protection transmission members 13 are evenly distributed around the movable inner protection support tube 11, and the three sets of the second inner protection transmission members 13 are spaced apart from the three sets of the first inner protection transmission members along the circumferential direction.

[0045] The second weld inner side buckle 14 has the same structure as the first weld inner side buckle, and three sets of the second weld inner side buckle 14 are respectively arranged on three sets of the second inner side protection transmission parts 13, and the connection relationship between the second weld inner side buckle 14 and the second inner side protection transmission part 13 is the same as the connection relationship between the first weld inner side buckle and the first inner side protection transmission part.

[0046] It should be noted that, after the inner buckling groove 9 is sent to the predetermined position inside the weld, the movable inner protection support tube 11 is pushed axially to the left, and the movable inner protection support tube 11 will drive the inner buckling groove of the second weld inner buckling member 14 to close axially with the inner buckling groove 9 to the same plane through the second inner protection transmission member 13, thereby achieving complete buckling of the inner circumference of the weld, and then argon is simultaneously delivered to the inner buckling groove 9 and the inner buckling groove of the second weld inner buckling member 14 through the inert gas supply member to provide sufficient inert gas protection for the inside 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 protection movable component. The inert gas relay component is simultaneously connected to the inner protection movable component and the inner protection fixed component.

[0048] The inert gas source component includes an inert gas source bottle and a gas pipe, one end of the gas pipe is connected to the inert gas source bottle, and the other end of the gas pipe is connected to the other end of the movable inner protection support tube 11 for conveying inert gas to the movable inner protection support tube 11.

[0049] The inert gas relay comprises a four-way pipe 15, a telescopic air pipe 16 and a relay air pipe 17. The three ports of the four-way pipe 15 are all connected to the side wall of one end of the fixed inner protection support pipe 1, one end of the telescopic air pipe 16 is connected to the fourth port of the four-way pipe 15, and the other end of the telescopic air pipe 16 is connected to one end face of the movable inner protection support pipe 11. As an option, the telescopic air pipe 16 is a spring air pipe. One end of the relay air pipe 17 is connected to a port of the four-way pipe 15, and the other end of the relay air pipe 17 is connected to the side wall of one end of the transmission support fixed pipe 2. The three relay air pipes 17 are connected to the three ports of the four-way pipe 15 and the three transmission support fixed pipes 2 one by one. The inert gas in the movable inner protection support tube 11 simultaneously enters the second weld inner buckle member 14 through the second inner protection transmission member 13, and simultaneously enters the inner buckle groove 9 through the inert gas relay member to simultaneously perform inert gas protection on the inner circumference of the weld.

[0050] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An inert gas delivery device for the inner side of the weld when welding a tank body to a pipeline, characterized in that: include: An inner protection fixing member, the inner protection fixing member comprising a fixed inner protection support member, a first inner protection transmission member and a first weld inner buckle member, the first inner protection transmission member is on the fixed inner protection support member, and pushes the connected first weld inner buckle member to expand and contract radially; An inner protection moving part, which is arranged on the inner protection fixing part, and the inner protection moving part includes a moving inner protection supporting part, a second inner protection transmission part and a second weld inner buckle part. The moving inner protection supporting part is on the fixed inner protection supporting part, driving the connected second inner protection transmission part to slide axially, and the second inner protection transmission part drives the connected second weld inner buckle part to expand and contract radially, and cooperates with the first weld inner buckle part to perform inert gas protection on the inner side surface of the weld in the circumferential direction; The inert gas supply component is connected to the inner protection fixing component and the inner protection moving component at the same time, so as to simultaneously deliver inert gas to the first weld inner buckle component and the second weld inner buckle component.

2. The inert gas delivery device for the inner side of the weld when welding the tank body connecting pipe according to claim 1 is characterized in that: The fixed inner protection support member includes a fixed inner protection support tube, one end face of which is closed to provide support for the first inner protection transmission member.

3. The inert gas delivery device for the inner side of the weld when the tank body is connected to the pipeline during welding according to claim 2, characterized in that: The first inner protection transmission member includes a first inner protection transmission support member and a first inner protection transmission power member. The first inner protection transmission support member is arranged on the fixed inner protection support tube, and the first inner protection transmission power member is arranged on the first inner protection transmission support member.

4. The inert gas delivery device for the inner side of the weld when welding the tank body connecting pipe according to claim 3 is characterized in that: The first inner protection transmission support member includes a transmission support fixed tube, a guide ring and a transmission support movable tube, one end of the transmission support fixed tube is arranged on the side wall of one end of the fixed inner protection support tube, the guide ring is embedded in the other end of the transmission support fixed tube, and the transmission support movable tube axially slides through the inner ring of the guide ring and then extends into the transmission support fixed tube.

5. The inert gas delivery device for the inner side of the weld when the tank body is connected to the pipeline during welding according to claim 4, characterized in that: The first inner side protection transmission power component includes a guide sealing ring, a magnetic coil and a return spring. The guide sealing ring is fixedly sleeved on one end of the transmission support movable tube, and the guide sealing ring is slidably embedded in the transmission support fixed tube; the magnetic coil is embedded in an annular groove in one end of the transmission support fixed tube; the return spring is sleeved outside one end of the transmission support movable tube, and one end of the return spring is connected to the guide ring, and the other end of the return spring is connected to the guide sealing ring; multiple sets of the first inner side protection transmission components are evenly distributed around the fixed inner protection support tube.

6. The inert gas delivery device for the inner side of the weld when welding the tank body connecting pipe according to claim 5 is characterized in that: The first weld inner buckle member includes an inner buckle groove, which is in the shape of an arc groove, and the bottom surface of the inner fixed buckle groove is through-set on the other end of the transmission support movable tube; multiple sets of the first weld inner buckle members correspond one by one to multiple sets of the first inner protection transmission members.

7. The inert gas delivery device for the inner side of the weld when the tank body is connected to the pipeline during welding according to claim 6, characterized in that: The movable inner protection support member comprises a movable inner protection support tube, one end face of the movable inner protection support tube is closed, and one end of the movable inner protection support tube is axially slidably embedded in the other end of the fixed inner protection support tube.

8. The inert gas delivery device for the inner side of the weld when welding the tank body connecting pipe according to claim 7 is characterized in that: The second inner protection transmission member has the same structure as the first inner protection transmission member. After one end of the transmission support fixed tube of the second inner protection transmission member passes through the sliding through hole on the wall of the movable inner protection support tube, one end of the transmission support fixed tube of the second inner protection transmission member is set on the movable inner protection support tube; multiple sets of the second inner protection transmission members are evenly distributed around the movable inner protection support tube, and multiple sets of the second inner protection transmission members and multiple sets of the first inner protection transmission members are spaced apart along the circumference.

9. The inert gas delivery device for the inner side of the weld when the tank body is connected to the pipeline during welding according to claim 8, characterized in that: The second weld inner side buckle has the same structure as the first weld inner side buckle, multiple sets of the second weld inner side buckle are arranged one by one on multiple sets of the second inner side protection transmission parts, and the connection relationship between the second weld inner side buckle and the second inner side protection transmission part is the same as the connection relationship between the first weld inner side buckle and the first inner side protection transmission part.

10. The inert gas delivery device for the inner side of the weld when welding the tank body connecting pipe according to claim 9, characterized in that: The inert gas supply component includes an inert gas source component and an inert gas relay component. The inert gas source component transports inert gas to the movable inner protection support tube that is connected through it, and the inert gas relay component is connected through it with the inner protection movable component and the inner protection fixed component at the same time; the inert gas relay component includes a four-way pipe, a telescopic air pipe and a relay air pipe, three ports of the four-way pipe are all connected through it with the side wall of one end of the fixed inner protection support tube, one end of the telescopic air pipe is connected through it with the fourth port of the four-way pipe, and the other end of the telescopic air pipe is connected through it with one end face of the movable inner protection support tube; one end of the relay air pipe is connected through it with a port of the four-way pipe, and the other end of the relay air pipe is connected through it with the side wall of one end of the transmission support fixed tube; the three relay air pipes are connected through it with the three ports of the four-way pipe and the three transmission support fixed tubes one by one.

Images