Welding protection device for long and straight welding seam of semi-cylinder assembly

Abstract

The invention provides a welding protection device for a long and straight welding seam of a semi-cylinder assembly, and belongs to the technical field of nuclear power horizontal transportation container welding. The welding protection device is characterized in that an inflation groove covers the outer side of the long and straight welding seam of the semi-cylinder assembly, and protection gas is introduced into a gas inlet pipe from a gas inlet hole and flows through a gas outlet pipe; the gas flows into the inflation cavity defined by the inflation groove and the semi-cylinder assembly from the gas outlet holes in the gas outlet pipe, gas protection is carried out on the back face of the long and straight welding seam of the semi-cylinder assembly, so that the protective gas in the semi-cylinder assembly is sufficient, defects caused by insufficient protective gas in the welding process of the long and straight welding seam of the semi-cylinder assembly are reduced, and the welding quality of the long and straight welding seam of the semi-cylinder assembly is improved. The welding quality of the semi-cylinder assembly is improved; the air inlet holes are symmetrically formed in the air inlet pipe, and the shielding gas is introduced in multiple paths, so that the inflation cavity can be more rapidly filled with the shielding gas, the adaptability of the shape of the welding seam of the semi-cylinder assembly is improved, and the distribution uniformity of the shielding gas around the welding seam can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of nuclear power horizontal transport container welding, and specifically relates to a long straight weld protection device for a semi-cylinder assembly. Background Art

[0002] Horizontal transport containers are used for road and rail transportation of related components to ensure the quality and safety of related components under normal transportation conditions. Therefore, horizontal transport containers have high requirements for dimensional accuracy and sealing. Long straight welds are key welds of horizontal transport containers. Their welding quality is directly related to the overall size and sealing of the transport container, and back gas protection is required; however, the existing welding gas protection device is not suitable for the long straight welds of semi-cylinder components, and it is impossible to perform effective back gas protection during the welding of semi-cylinder components, which affects the quality of the finished products of the fifty transport containers. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] In view of this, according to an embodiment of the present application, a long straight weld protection device for a semi-cylinder assembly is proposed, comprising:

[0005] An air filling groove is arranged inside the semi-cylinder assembly along the axial direction of the semi-cylinder assembly, the air filling groove is connected to the inner wall of the semi-cylinder assembly, and the air filling groove and the semi-cylinder assembly are surrounded to form an air filling cavity;

[0006] An air outlet pipe is arranged in the inflatable groove along the length direction of the inflatable groove, and an air outlet hole is arranged on the air outlet pipe so that the air outlet pipe is connected with the inflatable groove;

[0007] The air inlet pipe is connected with the air outlet pipe, and the air inlet pipe is symmetrically provided with air inlet holes, through which the air inlet pipe introduces the protective gas.

[0008] In a feasible embodiment, the air intake pipe includes a first air intake pipe and a second air intake pipe, and the first air intake pipe and the second air intake pipe are symmetrically arranged on the inflation groove; the first air intake pipe is provided with a first air intake hole, and the second air intake pipe is provided with a second air intake hole, and the first air intake hole and the second air intake hole are arranged at symmetrical positions of the first air intake pipe and the second air intake pipe.

[0009] In a feasible embodiment, the semi-cylinder assembly includes an arc plate and a connecting plate; the cross-section of the air filling groove is U-shaped, the first side of the air filling groove is connected to the arc plate, and the second side of the air filling groove is connected to the connecting plate.

[0010] In a feasible implementation manner, the long straight weld welding protection device of the semi-cylinder assembly further includes:

[0011] A transition pipe, the second end of the transition pipe is perpendicular to the first end of the transition pipe, the first end of the transition pipe is connected to the air inlet pipe, and the second end of the transition pipe is connected to the air outlet pipe, so that the air outlet pipe is connected to the air inlet pipe.

[0012] In a feasible implementation manner, the long straight weld welding protection device of the semi-cylinder assembly further includes:

[0013] A filter plate is provided with a filter hole group, the filter plate is arranged between the air outlet pipe and the semi-cylinder assembly along the length direction of the inflation groove, and the filter plate is connected to the inflation groove.

[0014] In a feasible implementation manner, the long straight weld welding protection device of the semi-cylinder assembly further includes:

[0015] The filter screen is arranged on the filter plate, and the filter screen is located on a side of the filter plate close to the air outlet pipe.

[0016] In a feasible implementation manner, the long straight weld welding protection device of the semi-cylinder assembly further includes:

[0017] A first filter hole group, the first filter hole group includes a plurality of first filter holes, and the first filter hole group is arranged on the filter plate;

[0018] The second filter hole group includes a plurality of second filter holes, and the second filter hole group is arranged on the filter plate. The hole spacing of the second filter hole group is smaller than the hole spacing of the first filter hole group.

[0019] In a feasible implementation manner, the aperture of the second filter hole is smaller than the aperture of the first filter hole.

[0020] In a feasible implementation, the air outlet is arranged between two adjacent air inlet holes; the first filter hole group is arranged near the air inlet hole, and the second filter hole group is arranged near the air outlet.

[0021] In a feasible implementation manner, the inflation groove is connected to the inner wall of the semi-cylinder assembly by welding.

[0022] Compared with the prior art, the long straight weld protection device of a semi-cylinder assembly of the present application has the following beneficial effects:

[0023] The long straight weld welding protection device of the semi-cylinder assembly provided in the embodiment of the present application comprises an air filling groove, an air outlet pipe and an air inlet pipe, the air inlet pipe and the air outlet pipe are connected to the air filling groove, and the air filling groove is connected to the semi-cylinder assembly to provide support for the entire welding protection device, so that the entire welding protection device can be stably fixed on the semi-cylinder assembly; the air filling groove covers the outer side of the long straight weld of the semi-cylinder assembly, and the protective gas is introduced into the air inlet pipe from the air inlet hole, and after flowing through the air outlet pipe, it flows into the air filling cavity surrounded by the air filling groove and the semi-cylinder assembly from the air outlet hole on the air outlet pipe, and the air inlet pipe is connected to the semi-cylinder assembly. Gas protection is performed on the back side to ensure sufficient shielding gas inside the semi-cylinder assembly. During welding, gas protection is performed on the back side of the long straight weld to ensure sufficient shielding gas flow on the back side of the long straight weld. This helps to reduce defects in the long straight weld of the semi-cylinder assembly caused by insufficient shielding gas during welding and helps to improve the welding quality of the semi-cylinder assembly. By symmetrically arranging air inlet holes on the air inlet pipe and introducing shielding gas in multiple ways, the shielding gas can fill the inflation cavity more quickly, thereby improving the adaptability to the weld shape of the semi-cylinder assembly and helping to improve the uniformity of shielding gas distribution around the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 A schematic structural diagram of a long straight weld protection device of a half-cylinder assembly after installation according to an embodiment of the present application;

[0026] Figure 2 A schematic structural diagram of a long straight weld protection device of a half-cylinder assembly provided in an embodiment of the present application at a first angle;

[0027] Figure 3 A schematic structural diagram of a long straight weld protection device of a half-cylinder assembly provided in an embodiment of the present application from a second angle;

[0028] Figure 4 A schematic structural diagram of an air outlet pipe of a long straight weld protection device of a half-cylinder assembly provided in an embodiment of the present application;

[0029] Figure 5 A schematic structural diagram of a long straight weld protection device of a half-cylinder assembly after installation according to another embodiment of the present application;

[0030] Figure 6 A schematic structural diagram of a transition pipe of a long straight weld protection device of a half-cylinder assembly provided in an embodiment of the present application;

[0031] Figure 7 A schematic structural diagram of a filter plate of a long straight weld protection device of a half-cylinder assembly provided in an embodiment of the present application;

[0032] in, Figures 1 to 7 The corresponding relationship between the reference numerals and component names in the figure is:

[0033] 11. semi-cylinder assembly; 12. inflation tank; 13. air outlet pipe; 14. air inlet pipe; 16. transition pipe; 17. filter plate; 18. first filter hole group; 19. second filter hole group;

[0034] 111. curved plate; 112. connecting plate. DETAILED DESCRIPTION

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0039] like Figures 1 to 4As shown, according to an embodiment of the present application, a long straight weld welding protection device of a semi-cylinder assembly is proposed, comprising: an air filling groove 12, an air outlet pipe 13 and an air inlet pipe 14; the air filling groove 12 is arranged inside the semi-cylinder assembly 11 along the axial direction of the semi-cylinder assembly 11, the air filling groove 12 is connected to the inner wall of the semi-cylinder assembly 11, and the air filling groove 12 and the semi-cylinder assembly 11 are surrounded by an air filling cavity; the air outlet pipe 13 is arranged in the air filling groove 12 along the length direction of the air filling groove 12, and the air outlet pipe 13 is provided with an air outlet hole, so that the air outlet pipe 13 is connected with the air filling groove 12; the air inlet pipe 14 is connected with the air outlet pipe 13, and the air inlet pipe 14 is symmetrically provided with air inlet holes, and the air inlet pipe 14 introduces protective gas through the air inlet holes.

[0040] The long straight weld welding protection device of the semi-cylinder assembly provided in the embodiment of the present application comprises an air filling groove 12, an air outlet pipe 13 and an air inlet pipe 14. The air inlet pipe 14 and the air outlet pipe 13 are connected to the air filling groove 12, and the air filling groove 12 is connected to the semi-cylinder assembly 11 to provide support for the entire welding protection device, so that the entire welding protection device can be stably fixed on the semi-cylinder assembly 11; the air filling groove 12 covers the outer side of the long straight weld of the semi-cylinder assembly 11, and the protective gas is introduced into the air inlet pipe 14 from the air inlet hole, flows through the air outlet pipe 13, and then flows into the air filling cavity surrounded by the air filling groove 12 and the semi-cylinder assembly 11 from the air outlet hole on the air outlet pipe 13. The back side of the long straight weld of the semi-cylinder component 11 is gas-protected so that there is sufficient shielding gas inside the semi-cylinder component 11. During the welding process, the back side of the long straight weld is gas-protected so that there is sufficient shielding gas flow on the back side of the long straight weld, which helps to reduce defects of the long straight weld of the semi-cylinder component 11 caused by insufficient shielding gas during the welding process, and helps to improve the welding quality of the semi-cylinder component 11. By symmetrically arranging air inlet holes on the air inlet pipe 14 and introducing shielding gas in multiple ways, the shielding gas can fill the inflation cavity more quickly, thereby improving the adaptability to the weld shape of the semi-cylinder component 11 and helping to improve the uniformity of shielding gas distribution around the weld.

[0041] As a preferred solution, the inflation tank 12, the air outlet pipe 13 and the air inlet pipe 14 are all made of stainless steel.

[0042] like Figure 5 As shown, in a feasible embodiment, the air intake pipe 14 includes a first air intake pipe and a second air intake pipe, and the first air intake pipe and the second air intake pipe are symmetrically arranged on the inflation groove 12; the first air intake pipe is provided with a first air intake hole, and the second air intake pipe is provided with a second air intake hole, and the first air intake hole and the second air intake hole are arranged at symmetrical positions of the first air intake pipe and the second air intake pipe.

[0043] In this technical solution, the air inlet pipe 14 is a split structure, and the first air inlet hole and the second air inlet hole are arranged at symmetrical positions of the first air inlet pipe and the second air inlet pipe, so that the two air inlet holes are located at symmetrical positions of the entire long straight weld, realizing two-way symmetrical air intake of the welding protection device, improving the air intake efficiency and air intake flow, so that the shielding gas can quickly reach the middle position of the long straight weld, so that the shielding gas can be instantaneously evenly distributed, and the back of the long straight weld is protected by gas during the welding process, so that the shielding gas flow on the back of the long straight weld is sufficient, so as to improve the welding quality of each part of the long straight weld, thereby improving the processing quality of the horizontal transport container.

[0044] It can be understood that when the air intake pipe 14 is a whole long tube structure, the two air intake holes are respectively located at the two ends of the air intake pipe 14; when the air intake pipe 14 is a split structure of two half pipes, each air intake pipe 14 is provided with an air intake hole, and the two air intake holes are located at symmetrical positions of the two half pipes, so that the air intake rate and efficiency of the two air intake pipes 14 are equal, ensuring the uniformity of the air intake in the inflation tank 12.

[0045] like Figure 1 As shown, in a feasible embodiment, the semi-cylinder assembly 11 includes an arc plate 111 and a connecting plate 112; the cross-section of the air-filling groove 12 is U-shaped, the first side of the air-filling groove 12 is connected to the arc plate 111, and the second side of the air-filling groove 12 is connected to the connecting plate 112.

[0046] In this technical solution, the long gap between the arc plate 111 and the connecting plate 112 is the weld to be welded. The first side of the gas filling groove 12 is connected to the arc plate 111, and the second side of the gas filling groove 12 is connected to the connecting plate 112 so that the gas filling groove 12 can cover the weld, thereby providing stable back gas protection for the long straight weld of the semi-cylinder assembly 11 and improving the first-time pass rate of the weld.

[0047] Furthermore, both ends of the gas filling groove 12 are closed, so that the shielding gas can circulate in the gas filling groove 12, ensuring that the shielding gas near the weld is sufficient, and providing sufficient back side gas protection for the weld.

[0048] like Figure 3 and Figure 6 As shown, in a feasible embodiment, the long straight weld welding protection device of the semi-cylinder assembly also includes: a transition pipe 16, the second end of the transition pipe 16 is perpendicular to the first end of the transition pipe 16, the first end of the transition pipe 16 is connected to the air inlet pipe 14, and the second end of the transition pipe 16 is connected to the air outlet pipe 13, so that the air outlet pipe 13 is connected to the air inlet pipe 14.

[0049] In this technical solution, the two ends of the transition pipe 16 are perpendicular to each other, and the two ends of the transition pipe 16 are respectively connected to the inlet pipe 14 and the outlet pipe 13, so that the inlet pipe 14 is connected with the outlet pipe 13 through the transition pipe 16. The transition pipe 16 passes through the inflation groove 12 and is sealed with the inflation groove 12 to ensure the closedness of the inflation groove 12. At the same time, the inlet pipe 14 can be installed on the outside of the inflation groove 12, reducing the occupation of the internal space of the inflation groove 12, so that the inside of the inflation groove 12 can accommodate more protective gas, ensuring the gas capacity of the inflation groove 12, thereby ensuring sufficient protective gas flow on the back side of the long straight weld.

[0050] Furthermore, a plurality of transition pipes 16 are arranged on the outlet pipe 13 at equal intervals along the length direction of the inflation groove 12 to improve the exhaust efficiency and uniformity of the exhaust from the inlet pipe 14 to the outlet pipe 13 .

[0051] like Figure 1 and Figure 3 As shown, in a feasible embodiment, the long straight weld welding protection device of the semi-cylinder assembly also includes: a filter plate 17, a filter hole group is arranged on the filter plate 17, the filter plate 17 is arranged between the air outlet pipe 13 and the semi-cylinder assembly 11 along the length direction of the inflation groove 12, and the filter plate 17 is connected to the inflation groove 12.

[0052] In this technical solution, the filter plate 17 is arranged in the inflation cavity, and the filter hole group is used to adjust the gas flow rate discharged from the outlet pipe 13, so that the shielding gas can be more evenly distributed around the weld after passing through the filter plate 17, so that the shielding gas around each position on the back of the weld is uniform and sufficient, so as to ensure the welding quality of each point on the long straight weld of the semi-cylinder assembly 11.

[0053] In a feasible implementation, the long straight weld welding protection device of the semi-cylinder assembly further includes: a filter screen, which is arranged on the filter plate 17 and is located on a side of the filter plate 17 close to the air outlet pipe 13 .

[0054] In this technical solution, a filter is arranged on the air inlet side of the filter plate 17. On the one hand, it can filter out solid particles, oil droplets and other impurities in the shielding gas to ensure the purity of the gas in the welding area, avoid affecting the welding quality and weld performance, and reduce welding defects in long straight welds; on the other hand, the filter can slow down the gas flow rate, help to evenly distribute the gas, maintain the stability of the shielding gas flow on the back of the long straight weld during the welding process, avoid welding defects caused by airflow fluctuations, and improve the welding quality of the long straight weld.

[0055] like Figure 7As shown, in a feasible embodiment, the long straight weld welding protection device of the semi-cylinder assembly also includes: a first filter hole group 18 and a second filter hole group 19; the first filter hole group 18 includes a plurality of first filter holes, and the first filter hole group 18 is arranged on the filter plate 17; the second filter hole group 19 includes a plurality of second filter holes, and the second filter hole group 19 is arranged on the filter plate 17, and the hole spacing of the second filter hole group 19 is smaller than the hole spacing of the first filter hole group 18.

[0056] In this technical solution, a first filter hole group 18 and a second filter hole group 19 are provided on the filter plate 17, and the hole spacings between the first filter hole group 18 and the second filter hole group 19 are different. By arranging the first filter hole group 18 and the second filter hole group 19, the shielding gas output and the concentration at different positions on the filter plate 17 are adjusted, so that the shielding gas output on the back of the long straight weld is uniform, which can meet the welding requirements of the long straight weld.

[0057] Furthermore, the filter holes are arranged in a matrix form on the filter plate 17 to further improve the uniformity of the gas output from each filter hole group.

[0058] like Figure 7 As shown, in a feasible implementation manner, the aperture of the second filter hole is smaller than the aperture of the first filter hole.

[0059] In this technical solution, the aperture of the second filter hole is smaller than that of the first filter hole, that is, the filter holes of the second filter hole group 19 are densely arranged and have small apertures, and the filter holes of the first filter hole group 18 are sparsely arranged and have large apertures. By setting filter holes of different spacings and sizes, the gas flow rate at each position of the filter plate 17 is adjusted, so that the overall gas outlet of the filter plate 17 is uniform, that is, the instantaneous uniformity of the shielding gas on the back of the weld is improved, and the real-time uniform state of the shielding gas in the inflation tank 12 is ensured.

[0060] In a feasible implementation, the air outlet is arranged between two adjacent air inlet holes; the first filter hole group 18 is arranged near the air inlet hole, and the second filter hole group 19 is arranged near the air outlet.

[0061] In this technical solution, a first filter hole group 18 is arranged near the air inlet of the filter plate 17, and a second filter hole group 19 is arranged near the air outlet of the filter plate 17, so that the filter holes at the air outlet of the inflation groove 12 have a small spacing and a small aperture, while the filter holes at the air inlet of the inflation groove 12 have a large spacing and a large aperture, so as to improve the uniformity of the gas outlet of the inflation groove 12 and meet the demand for the protective gas replenishment amount of the long straight weld segmented welding of the semi-cylinder assembly 11.

[0062] Furthermore, an air outlet hole is provided in the middle of the air outlet pipe 13, two air inlet holes are located on both sides of the air outlet hole, and the second filter hole is located on the filter plate 17 near the air outlet hole; the two first filter hole groups 18 are located on the filter plate 17 away from the air outlet, that is, the first filter hole is located on the filter plate 17 near the air inlet hole, thereby improving the uniformity of ventilation of the inflation groove 12 through the setting of the filter plate 17.

[0063] As a preferred solution, the air intake flow rate of the air intake hole is 10 to 20 L / min, which can ensure that the air flow at each position of the filter plate 17 of the welding protection device is uniform.

[0064] like Figure 1 As shown, in a feasible embodiment, the inflation groove 12 is welded to the inner wall of the semi-cylinder assembly 11 .

[0065] In this technical solution, the stability of the connection between the inflation groove 12 and the semi-cylinder assembly 11 is improved, so as to provide stable support for the entire welding protection device through the welding connection between the inflation groove 12 and the semi-cylinder assembly 11, thereby improving the structural reliability of the welding protection device.

[0066] As a preferred solution, the inflation groove 12 is spot-welded to the inner wall of the semi-cylinder assembly 11, which can not only ensure the stability of the connection between the welding protection device and the semi-cylinder assembly 11, but also facilitate the removal of the welding protection device from the semi-cylinder assembly 11 after the semi-cylinder welding is completed, and the disassembly and assembly is convenient and quick.

[0067] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0068] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A long straight weld welding protection device for a semi-cylinder assembly, characterized in that: The long straight weld welding protection device of the semi-cylinder assembly comprises: An air filling groove, which is arranged inside the semi-cylinder assembly along the axial direction of the semi-cylinder assembly, the air filling groove is connected to the inner wall of the semi-cylinder assembly, and the air filling groove and the semi-cylinder assembly are surrounded by an air filling cavity; An air outlet pipe, the air outlet pipe is arranged in the air filling groove along the length direction of the air filling groove, and an air outlet hole is arranged on the air outlet pipe so that the air outlet pipe is connected with the air filling groove; An air inlet pipe is connected to the air outlet pipe, and air inlet holes are symmetrically arranged on the air inlet pipe, and the air inlet pipe introduces protective gas through the air inlet holes.

2. A long straight weld welding protection device for a semi-cylinder assembly according to claim 1, characterized in that: The air intake pipe comprises a first air intake pipe and a second air intake pipe, wherein the first air intake pipe and the second air intake pipe are symmetrically arranged on the charging groove; The first air inlet pipe is provided with a first air inlet hole, the second air inlet pipe is provided with a second air inlet hole, and the first air inlet hole and the second air inlet hole are arranged at symmetrical positions of the first air inlet pipe and the second air inlet pipe.

3. A long straight weld welding protection device for a semi-cylinder assembly according to claim 1, characterized in that: The semi-cylinder assembly comprises an arc-shaped plate and a connecting plate; The cross section of the gas-filled groove is U-shaped, a first side of the gas-filled groove is connected to the arc-shaped plate, and a second side of the gas-filled groove is connected to the connecting plate.

4. A long straight weld welding protection device for a semi-cylinder assembly according to claim 1, characterized in that: The long straight weld welding protection device of the semi-cylinder assembly also includes: A transition pipe, wherein the second end of the transition pipe is perpendicular to the first end of the transition pipe, the first end of the transition pipe is connected to the air inlet pipe, and the second end of the transition pipe is connected to the air outlet pipe, so that the air outlet pipe is connected to the air inlet pipe.

5. A long straight weld welding protection device for a semi-cylinder assembly according to claim 1, characterized in that: The long straight weld welding protection device of the semi-cylinder assembly also includes: A filter plate is provided with a filter hole group, the filter plate is arranged between the air outlet pipe and the semi-cylinder component along the length direction of the inflation groove, and the filter plate is connected to the inflation groove.

6. A long straight weld welding protection device for a semi-cylinder assembly according to claim 5, characterized in that: The long straight weld welding protection device of the semi-cylinder assembly also includes: The filter screen is arranged on the filter plate, and the filter screen is located on a side of the filter plate close to the air outlet pipe.

7. A long straight weld protection device for a semi-cylinder assembly according to claim 5, characterized in that: The long straight weld welding protection device of the semi-cylinder assembly also includes: A first filter hole group, the first filter hole group includes a plurality of first filter holes, and the first filter hole group is arranged on the filter plate; The second filter hole group includes a plurality of second filter holes, the second filter hole group is arranged on the filter plate, and the hole spacing of the second filter hole group is smaller than the hole spacing of the first filter hole group.

8. A long straight weld protection device for a semi-cylinder assembly according to claim 7, characterized in that: The aperture of the second filter hole is smaller than the aperture of the first filter hole.

9. A long straight weld protection device for a semi-cylinder assembly according to claim 8, characterized in that: The air outlet is arranged between two adjacent air inlet holes; The first filter hole group is arranged near the air inlet, and the second filter hole group is arranged near the air outlet.

10. A welding protection device for a long straight weld of a semi-cylinder assembly according to any one of claims 1 to 9, characterized in that: The inflation groove is connected to the inner wall of the semi-cylinder assembly by welding.

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