A reinforcing cage welding device

Abstract

The present application relates to the technical field of welding, more particularly, it relates to a steel bar framework welding device, comprising a two-protective welding machine, and a welding gun connected with the two-protective welding machine, the welding gun is provided with an inner gun barrel and an outer gun barrel, and the inner gun barrel and the outer gun barrel are coaxially arranged, a rotating clamping assembly is arranged between the inner gun barrel and the outer gun barrel, and the gap between the inner gun barrel and the outer gun barrel forms an airflow channel under the connection of the rotating clamping assembly, a spiral flow guide assembly is arranged in the airflow channel, an inner and outer layer flow guide head is arranged at the bottom end of the inner gun barrel, a plurality of driving rods corresponding to the spiral flow guide assembly are arranged on the lower end of the inner wall of the outer gun barrel, and the outer gun barrel drives the driving rods to abut and adjust the spiral flow guide assembly to generate deformation and adjust the angle of the spiral; the present application solves the problem that in the steel bar framework welding, the environmental interference wind flow causes the dispersion of carbon dioxide protective gas, and a stable protective atmosphere cannot be formed, which seriously affects the welding quality.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and more specifically, to a welding apparatus for steel reinforcement cages. Background Technology

[0002] In the welding of steel reinforcement cages, the stability and reliability of welding quality are crucial. However, in actual welding processes, environmental interference from wind and airflow becomes a significant challenge. In traditional welding equipment, carbon dioxide shielding gas is directly injected into the weld area through a straight-tube torch to create a protective atmosphere and prevent the weld from reacting with oxygen, nitrogen, and other gases in the air at high temperatures, thus preventing a decline in weld quality. However, in windy environments, this straight-tube injection method is particularly vulnerable. Ambient wind directly interferes with the injection trajectory of the carbon dioxide shielding gas, causing the gas to disperse and failing to form a stable and concentrated protective atmosphere around the weld. As the shielding gas disperses, harmful gases such as oxygen and nitrogen in the air can penetrate the welding area and react with the weld metal at high temperatures, leading to a series of welding defects such as porosity, oxidation, and slag inclusions. These problems not only affect the appearance of the weld but also severely weaken its mechanical properties, reducing the overall safety and reliability of the welded structure.

[0003] To address the aforementioned issues, a steel reinforcement cage welding device is proposed. Summary of the Invention

[0004] (a) Technical problems to be solved To address the problems existing in the prior art, the present invention provides a steel reinforcement cage welding device to solve the problem mentioned in the background art where environmental interference such as wind and airflow causes the carbon dioxide protective gas to disperse, making it impossible to form a stable protective atmosphere and seriously affecting the welding quality.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a steel reinforcement cage welding device, comprising a MIG / MAG welding machine and a welding torch connected to the MIG / MAG welding machine, wherein the welding torch is provided with an inner barrel and an outer barrel, and the inner barrel and the outer barrel are coaxially arranged, a rotating snap-fit ​​assembly is provided between the inner barrel and the outer barrel, and the gap between the inner barrel and the outer barrel forms an airflow channel when connected by the rotating snap-fit ​​assembly, a spiral guide assembly is provided in the airflow channel, and an inner and outer layer guide head is provided at the bottom end of the inner barrel, and multiple sets of drive rods corresponding to the spiral guide assembly are provided at the lower end of the inner wall of the outer barrel, and the rotation of the outer barrel drives the drive rods to abut against and adjust the spiral guide assembly to generate deformation and adjust the angle of the spiral. An air inlet pipe communicating with the airflow channel is provided on the outer circumferential outer wall of the outer barrel, and the air inlet pipe is located above the spiral guide assembly. The inner walls of the inner and outer guide heads are used to guide the carbon dioxide in the inner gun barrel to the welding point to protect the welding point, and the outer walls of the inner and outer guide heads are used to tilt the gas in the airflow channel outward to resist wind resistance.

[0006] The present invention is further configured such that the bottom end of the inner wall of the inner barrel is provided with an internal thread, and the bottom end of the inner barrel and the inner and outer flow guides are detachably connected by threads. The inner and outer flow guide heads include a threaded connection seat that is threaded to the inner wall of the inner barrel, a flow guide seat disposed at the bottom of the threaded connection seat, and a hexagonal wrench groove formed at the bottom of the flow guide seat.

[0007] The present invention is further configured such that the inner wall of the flow guide seat is provided with an axial flow guide surface, and the outer wall of the flow guide seat is provided with an external flow guide surface.

[0008] The invention is further configured such that the outer gun barrel includes a sleeve connected to the rotating snap-fit ​​assembly, and a flow-limiting edge disposed at the bottom end of the sleeve corresponding to the outer flow-guiding surface of the outer wall of the flow guide seat.

[0009] The present invention is further configured such that the inner barrel is composed of an upper barrel and a lower barrel, and the outer diameter of the upper barrel is smaller than the outer diameter of the lower barrel; The rotating snap-fit ​​assembly is sleeved on the upper tube and abuts against the top of the lower tube.

[0010] The present invention is further configured such that a limiting groove is formed on the outer circumferential wall of the lower tube; The spiral flow guide assembly includes a limiting sleeve that is movably fitted onto the lower tube, and the inner wall of the limiting sleeve is provided with a limiting strip that is movably matched with the limiting groove. The outer circumference of the limiting sleeve is provided with a ring array of multiple sets of flow guide strips, and the bottom end of the flow guide strip is provided with a deformation strip. The deformation strip corresponds to the outer flow guide surface on the flow guide seat and the flow limiting edge on the sleeve.

[0011] The present invention is further configured such that the rotating snap-fit ​​assembly includes a spring groove formed on the outer wall of the upper tube, and a spring and a snap-fit ​​ball disposed in the spring groove.

[0012] The present invention is further configured such that the rotating snap-fit ​​assembly includes a rotating sleeve fitted onto the upper tube, and the inner wall of the rotating sleeve is provided with a plurality of slots in an annular array that match the snap-fit ​​of the snap-fit ​​ball.

[0013] The present invention is further configured such that the outer circumferential wall of the rotating sleeve is provided with a connecting thread, and the top end of the rotating sleeve is provided with a hand ring that is movably sleeved with the upper tube.

[0014] The present invention is further configured such that a threaded inner ring is provided on the side of the top end of the sleeve near the inner gun barrel, which is matched and connected to the connecting thread on the rotating sleeve.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a steel reinforcement cage welding device, which has the following beneficial effects: 1. This invention utilizes a double-layer airflow structure formed by an inner and outer barrel. The outer airflow, guided by a spiral flow guide component, forms an annular airflow barrier, effectively counteracting external interference airflow and protecting the inner carbon dioxide gas from wind. The inner carbon dioxide gas then flows axially and precisely covers the weld joint, ensuring a stable protective atmosphere in the welding area. Even if the outer airflow barrier is damaged and interference airflow enters the inner layer, it will flow along the arc surface due to its action on the carbon dioxide airflow converging towards the axis, significantly reducing damage to the welding environment and thus greatly improving the stability of the welding environment. This effectively solves the problem of interference from ambient wind on the welding protective gas.

[0016] 2. This invention, by rotating the outer barrel, causes the deformation strips and drive rods on the spiral guide assembly to misalign, resulting in an inclined angle for the deformation strips. In windless or low-wind environments, the deformation strips remain vertical, reducing air pump energy consumption and improving economy. In windy environments, the outer barrel can be rotated according to the actual wind strength to adjust the deformation strips to an appropriate inclined angle, forming multiple sets of outward-inclined airflows. These airflows combine circumferentially to form a rotating outward airflow barrier, effectively resisting interfering airflows. When interfering airflows encounter this barrier, they are either thrown out by the centrifugal force of rotation or canceled out by the force of the rotating airflow, and further weakened by the outward-inclined force, thereby significantly reducing the impact of interfering airflows on the welding process and ensuring stable welding quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the steel reinforcement cage welding device.

[0018] Figure 2 This is a schematic diagram of the exploded structure of the inner barrel, outer barrel, rotating locking assembly, spiral flow guide assembly, and inner and outer flow guide heads.

[0019] Figure 3 This is a schematic diagram of a double-layer airflow structure formed by the combination of an inner barrel, an outer barrel, and inner and outer guide heads.

[0020] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0021] Figure 5 This is a schematic diagram of the internal barrel and the rotating locking assembly.

[0022] Figure 6 This is a schematic diagram of the inner and outer flow guide heads.

[0023] Figure 7 This is a schematic diagram of the outer barrel.

[0024] Figure 8 This is a schematic diagram of the spiral flow guide assembly.

[0025] Figure 9 This is a schematic diagram of the assembled structure of the inner barrel, outer barrel, rotating snap-fit ​​assembly, spiral flow guide assembly, and inner and outer flow guide heads.

[0026] Figure 10 This is a top-view diagram showing the airflow after the airflow is ejected from the airflow channel when the deformation strip is tilted.

[0027] In the diagram: 1. MIG / MAG welding machine; 2. Welding torch; 3. Inner barrel; 31. Upper tube; 311. Spring groove; 32. Lower tube; 321. Limiting groove; 33. Internal thread; 4. Outer barrel; 41. Sleeve; 42. Flow limiting edge; 43. Threaded inner ring; 5. Rotary snap-fit ​​assembly; 51. Spring; 52. Ball catcher; 53. Rotating sleeve; 54. Slot; 55. Connecting thread; 56. Hand ring; 6. Airflow channel; 7. Spiral guide assembly; 71. Limiting sleeve; 72. Limiting strip; 73. Guide strip; 74. Deformation strip; 8. Inner and outer layer guide heads; 81. Threaded connection seat; 82. Guide seat; 821. Axial guide surface; 822. Outer guide surface; 83. Hexagonal wrench groove; 9. Drive rod; 10. Inlet pipe. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0031] For examples, please refer to Figure 1 - Figure 10A steel reinforcement cage welding device includes a MIG welder 1 and a welding torch 2 connected to the MIG welder 1. The welding torch 2 is provided with an inner barrel 3 and an outer barrel 4, which are coaxially arranged. A rotating snap-fit ​​assembly 5 is provided between the inner barrel 3 and the outer barrel 4. When the inner barrel 3 and the outer barrel 4 are connected by the rotating snap-fit ​​assembly 5, an airflow channel 6 is formed between them. A spiral guide assembly 7 is provided in the airflow channel 6. The bottom end of the inner barrel 3 is provided with inner and outer layer guide heads 8. The lower end of the inner wall of the outer barrel 4 is provided with multiple sets of drive rods 9 corresponding to the spiral guide assembly 7. The rotation of the outer barrel 4 drives the drive rods 9 to abut against and adjust the spiral guide assembly 7 to generate deformation and adjust the angle of the spiral. An air inlet pipe 10 communicating with the airflow channel 6 is provided on the outer circumferential outer wall of the outer barrel 4, and the air inlet pipe 10 is located above the spiral guide assembly 7. The inner walls of the inner and outer guide heads 8 are used to guide the carbon dioxide in the inner gun barrel 3 to the welding point to protect the welding point, and the outer walls of the inner and outer guide heads 8 are used to tilt the gas in the airflow channel 6 outward to resist wind resistance.

[0032] The MIG / MAG welding machine 1 and welding torch 2 are existing technologies and will not be described in detail here. The inner barrel 3 is the existing barrel on the welding torch 2, but it is an improvement on the existing barrel. The barrel of the existing welding torch 2 is a straight cylinder. When welding, it is affected by the wind in the external environment, which causes the carbon dioxide sprayed from the barrel to be blown away. The blown carbon dioxide destroys the protective atmosphere, causing air to enter the welding area, which in turn causes a series of quality problems such as porosity, oxidation, slag inclusion, and unstable arc. In severe cases, it can lead to weld performance failure.

[0033] This invention forms an airflow channel 6 through an inner gun barrel 3 and an outer gun barrel 4. A double-layer airflow is injected through the airflow channel 6 and the inner gun barrel 3. The inner gun barrel 3 injects carbon dioxide, and the airflow channel 6 injects an airflow barrier. The airflow barrier injected by the airflow channel 6 is used to resist the interference of external wind force and prevent the carbon dioxide injected by the inner gun barrel 3 from being blown away. This would prevent air from entering the welding area and causing a series of quality problems such as porosity, oxidation, slag inclusion, and arc instability.

[0034] Specifically, the conductive nozzle, wire feeding hose, and distributor are located inside the inner barrel 3. This is existing technology and will not be elaborated further. Carbon dioxide is evenly distributed into the inner barrel 3 via the distributor and discharged outwards from the inner and outer guide heads 8 at the bottom of the inner barrel 3. When the carbon dioxide passes through the inner walls of the inner and outer guide heads 8, it is guided and concentrated towards the axis. After being concentrated axially, the carbon dioxide intersects below the welding point, ensuring the welding point is within the carbon dioxide coverage area. Simultaneously, an air pump is connected to the air inlet pipe 10 on the outer barrel 4, which inputs a moving airflow into the airflow channel 6. This moving airflow is discharged outwards from the opening end, and during discharge, it contacts the outer walls of the inner and outer guide heads 8, thereby... This causes the airflow to move away from the axis and form a blocking airflow. Since the blocking airflow is set away from the axis, the inclined airflow will partially cancel out the wind force under wind interference. At the same time, when the wind force is strong, the outer gun barrel 4 is rotated, which drives the drive rod 9 to rotate, thereby contacting the spiral guide component 7 in the airflow channel 6. This causes the lower end of the spiral guide component 7 to deform, causing the inclined airflow away from the axis to rotate circumferentially. As a result, when the interfering wind airflow collides with the circumferentially rotating airflow barrier, it will be thrown out or canceled out by the centrifugal force of the circumferentially rotating air wall. This reduces the interference of the interfering wind airflow on the inner carbon dioxide, so that the carbon dioxide can better cover the welding point area to ensure the welding quality.

[0035] The inner wall of the inner barrel 3 has an internal thread 33 at the bottom, and the bottom of the inner barrel 3 and the inner and outer guide heads 8 are detachably connected by threads. The inner and outer flow guide head 8 includes a threaded connection seat 81 that is threaded to the inner thread 33 on the inner wall of the inner barrel 3, a flow guide seat 82 disposed at the bottom of the threaded connection seat 81, and a hexagonal wrench groove 83 opened at the bottom of the flow guide seat 82.

[0036] The inner wall of the flow guide seat 82 is provided with an axial flow guide surface 821, and the outer wall of the flow guide seat 82 is provided with an external flow guide surface 822.

[0037] After the inner barrel 3 is threadedly connected to the inner and outer guide heads 8, the inner wall of the inner barrel 3 and the axial guide surface 821 transition smoothly. When carbon dioxide is injected, after it comes into contact with the axial guide surface 821, the carbon dioxide moves closer to the axis, finally forming an arc-shaped conical airflow, as shown in the following figure. Figure 3 As shown, its arc-shaped conical intersection is located behind the weld point, thus enveloping the weld point in carbon dioxide and ensuring good welding protection. At the same time, after the outer airflow is disrupted by the interfering airflow and the infected airflow enters the inner layer, it will act on the arc surface of the carbon dioxide airflow that gathers towards the axis, so that the interfering airflow flows with the arc surface, reducing the damage to the carbon dioxide welding environment and thus improving the stability of the welding environment.

[0038] In the section of the guide seat 82, the axial guide surface 821 and the outer guide surface 822 are arranged in a figure-eight pattern, so that the airflow after carbon dioxide injection and the airflow ejected from the airflow channel 6 are opposite, and their airflow paths are as follows: Figure 3 As shown.

[0039] The outer barrel 4 includes a sleeve 41 connected to the rotating snap-fit ​​assembly 5, and a flow-limiting edge 42 disposed at the bottom end of the sleeve 41 corresponding to the outer flow-guiding surface 822 of the outer wall of the flow guide seat 82.

[0040] The sleeve 41 consists of an inner tube, an outer tube, and a connecting ring. The cross-section of the inner tube, outer tube, and connecting ring is arranged in an inverted U-shape, and the groove of the U-shape is the airflow channel 6. The inner tube is used to connect with the rotating snap-fit ​​assembly 5, and the outer tube corresponds to the inner gun barrel 3. The flow-limiting edge 42 is set at the lower end of the outer tube corresponding to the outward guide surface 822, thereby forming the airflow channel 6. The air inlet pipe 10 is set on the outer tube. The airflow enters from the air inlet pipe 10 in the area corresponding to the outer tube and the inner tube, then diffuses in the airflow channel 6, and finally sprays out from the outlet of the airflow channel 6 corresponding to the flow-limiting edge 42 and the outward guide surface 822, forming an outwardly inclined annular airflow barrier, thereby offsetting the airflow that interferes with the wind.

[0041] The inner barrel 3 consists of an upper barrel 31 and a lower barrel 32, and the outer diameter of the upper barrel 31 is smaller than the outer diameter of the lower barrel 32; The rotating snap-fit ​​assembly 5 is fitted onto the upper tube 31 and abuts against the top of the lower tube 32.

[0042] The inner diameters of the upper tube 31 and the lower tube 32 are the same. The difference in the outer diameter between the upper tube 31 and the lower tube 32 is only to form a step, so that the rotating snap-fit ​​assembly 5 will not slip off after being fitted onto the upper tube 31.

[0043] A limiting groove 321 is provided on the outer circumference of the lower tube 32; The spiral flow guide assembly 7 includes a limiting sleeve 71 that is movably sleeved on the lower pipe 32, and the inner wall of the limiting sleeve 71 is provided with a limiting strip 72 that is movably matched with the limiting groove 321. The outer circumference of the limiting sleeve 71 is provided with a ring array of multiple sets of flow guide strips 73, and the bottom end of the flow guide strip 73 is provided with a deformation strip 74. The deformation strip 74 corresponds to and fits the outer flow guide surface 822 on the flow guide seat 82 and the flow limiting edge 42 on the sleeve 41.

[0044] Multiple sets of limiting grooves 321 are formed on the outer circumference of the lower pipe 32, but the top of the limiting grooves 321 does not penetrate the top of the lower pipe 32, so that the spiral guide assembly 7 can be limited after being sleeved.

[0045] Specifically, the limiting strip 72 on the limiting sleeve 71 is aligned with the limiting groove 321 on the lower tube 32. Then, the limiting sleeve 71 is sleeved from the bottom of the lower tube 32 upwards until the limiting strip 72 touches the top of the limiting groove 321. After the limiting sleeve 71 and the lower tube 32 are sleeved, the guide strip 73 is located in the airflow channel 6, and one side of the guide strip 73 is attached to the inner wall of the outer tube in the sleeve 41. By welding multiple sets of guide strips 73 and the outer wall of the limiting sleeve 71 together, the airflow is divided into multiple airflows. The guide strip 73 and the deformation strip 74 are integrally formed. The deformation strip 74 protrudes from the limiting sleeve 71 and is attached to the outer guide surface 822 on the guide seat 82 and the flow limiting edge 42 on the sleeve 41. When the outer gun barrel 4 rotates the drive rod 9 to push the deformation strip 74, the deformation strip 74 will tilt, thereby turning the annular direct current airflow barrier into a rotating annular airflow barrier.

[0046] The rotating snap-fit ​​assembly 5 includes a spring groove 311 formed on the outer wall of the upper tube 31, and a spring 51 and a snap-fit ​​ball 52 disposed in the spring groove 311.

[0047] The rotating snap-fit ​​assembly 5 also includes a rotating sleeve 53 sleeved on the upper tube 31, and the inner wall of the rotating sleeve 53 is provided with a ring array of multiple sets of slots 54 that match the snap-fit ​​ball 52.

[0048] The outer circumference of the rotating sleeve 53 is provided with a connecting thread 55, and the top of the rotating sleeve 53 is provided with a hand ring 56 that is movably connected to the upper tube 31.

[0049] The top of the sleeve 41 is provided with a threaded inner ring 43 that matches and connects with the connecting thread 55 on the rotating sleeve 53.

[0050] The specific adjustment of the deformation strip 74 is as follows: In the initial state, the deformation strip 74 and the guide strip 73 are in a vertical state. In this state, after the airflow enters through the air inlet pipe 10, it is divided into multiple sets of strip-shaped inclined expansion airflow by multiple sets of guide strips 73. Multiple sets of airflow form an annular airflow barrier on the outer ring of the weld point.

[0051] When the interfering wind and airflow are strong, the outer barrel 4 is rotated according to the wind intensity to continue adjustment. When the outer barrel 4 rotates, it drives the drive rod 9 to rotate. The drive rod 9 rotates circumferentially, thereby pushing the deformation strip 74 to bend circumferentially. It should be noted that when the guide strip 73 and the deformation strip 74 are in a straight line, the drive rod 9 is in contact with the deformation strip 74. Therefore, when the outer barrel 4 is rotated, the drive rod 9 and the deformation strip 74 are misaligned, thereby causing the deformation strip 74 to deform and bend.

[0052] The air pump inputs airflow into the airflow channel 6, and then sprays it out from below along the channel composed of multiple sets of deformation strips 74 and guide strips 73. When the airflow passes through the deformation strips 74, the airflow bends and sprays circumferentially. Multiple sets of airflows sprayed axially form a circumferentially rotating airflow barrier.

[0053] The most important point to note is the installation between the various components. The handheld ring 56 has anti-slip grooves. First, the outer barrel 4 is threaded and matched with the connecting threads on the inner threaded ring 43 and the rotating sleeve 53. By holding the handheld ring 56, the rotating sleeve 53 cannot rotate, so that the outer barrel 4 and the rotating sleeve 53 can be securely connected. It should be noted that during the initial threaded connection, the rotating sleeve 53 can also be restricted by rotating the locking component 5, thus achieving the threaded connection. However, the restriction method of holding the handheld ring 56 is only used at the end to ensure the reliability of the connection.

[0054] After the outer barrel 4 and the rotating sleeve 53 are connected, the spiral guide assembly 7 is fitted onto the inner barrel 3. Then, the inner and outer guide heads 8 and the inner barrel 3 are threaded together. The threaded connection between the inner and outer guide heads 8 and the inner barrel 3 limits and locks the spiral guide assembly 7. Finally, a hex wrench is used to tighten the inner and outer guide heads 8 and the inner barrel 3, so that the deformation strip 74 and the outer guide surface 822 on the inner and outer guide heads 8 fit together. This installation method facilitates later disassembly and cleaning of the inner wall of the inner barrel 3.

[0055] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel reinforcement cage welding device, comprising a MIG welder (1) and a welding torch (2) connected to the MIG welder (1), characterized in that: The welding torch (2) is provided with an inner barrel (3) and an outer barrel (4), and the inner barrel (3) and the outer barrel (4) are coaxially arranged. A rotating snap-fit ​​assembly (5) is provided between the inner barrel (3) and the outer barrel (4). The gap between the inner barrel (3) and the outer barrel (4) forms an airflow channel (6) when connected by the rotating snap-fit ​​assembly (5). A spiral guide assembly (7) is provided in the airflow channel (6). An inner and outer layer guide head (8) is provided at the bottom of the inner barrel (3). Multiple sets of drive rods (9) corresponding to the spiral guide assembly (7) are provided at the lower end of the inner wall of the outer barrel (4). The rotation of the outer barrel (4) drives the drive rods (9) to abut against the spiral guide assembly (7) to generate deformation and adjust the angle of the spiral. The outer barrel (4) is provided with an air inlet pipe (10) that communicates with the airflow channel (6) on its outer circumferential outer wall, and the air inlet pipe (10) is located above the spiral guide assembly (7); The inner wall of the inner and outer layer guide head (8) is used to guide the carbon dioxide in the inner gun barrel (3) to the welding point to protect the welding point, and the outer wall of the inner and outer layer guide head (8) is used to guide the gas in the airflow channel (6) outward to resist wind resistance. The inner barrel (3) has an internal thread (33) at the bottom of its inner wall, and the bottom of the inner barrel (3) and the inner and outer flow guides (8) are detachably connected by threads. The inner and outer layer guide head (8) includes a threaded connection seat (81) that is threaded to the inner thread (33) on the inner wall of the inner barrel (3), a guide seat (82) disposed at the bottom of the threaded connection seat (81), and a hexagonal wrench groove (83) opened at the bottom of the guide seat (82). The inner wall of the flow guide seat (82) is provided with an axial flow guide surface (821), and the outer wall of the flow guide seat (82) is provided with an external flow guide surface (822). The outer barrel (4) includes a sleeve (41) connected to the rotating snap-fit ​​assembly (5), and a flow-limiting edge (42) disposed at the bottom end of the sleeve (41) corresponding to the outer flow-guiding surface (822) of the outer wall of the flow guide seat (82). The inner barrel (3) is composed of an upper tube (31) and a lower tube (32), and the outer diameter of the upper tube (31) is smaller than the outer diameter of the lower tube (32); The rotating snap-fit ​​assembly (5) is sleeved on the upper tube (31) and abuts against the top of the lower tube (32); A limiting groove (321) is provided on the outer circumference of the lower tube (32); The spiral flow guide assembly (7) includes a limiting sleeve (71) that is movably sleeved on the lower pipe (32), and the inner wall of the limiting sleeve (71) is provided with a limiting strip (72) that is movably matched with the limiting groove (321). The outer circumference of the limiting sleeve (71) is provided with a ring array of multiple sets of flow guide strips (73), and the bottom end of the flow guide strip (73) is provided with a deformation strip (74). The deformation strip (74) is correspondingly attached to the outer flow guide surface (822) on the flow guide seat (82) and the flow limiting edge (42) on the sleeve (41). When the guide bar (73) and the deformation bar (74) are straight, the drive rod (9) is in contact with the deformation bar (74). When the outer barrel (4) is rotated, the drive rod (9) and the deformation bar (74) are misaligned, causing the deformation bar (74) to bend and transform the annular direct current airflow barrier into a rotating annular airflow barrier.

2. The steel reinforcement cage welding device according to claim 1, characterized in that: The rotating snap-fit ​​assembly (5) includes a spring groove (311) formed on the outer wall of the upper tube (31), and a spring (51) and a snap-fit ​​ball (52) disposed in the spring groove (311).

3. The steel reinforcement cage welding device according to claim 2, characterized in that: The rotating snap-fit ​​assembly (5) also includes a rotating sleeve (53) fitted onto the upper tube (31), and the inner wall of the rotating sleeve (53) has a ring array of multiple sets of slots (54) that match the snap-fit ​​ball (52).

4. The steel reinforcement cage welding device according to claim 3, characterized in that: The rotating sleeve (53) has a connecting thread (55) on its outer circumference, and the top of the rotating sleeve (53) is provided with a hand ring (56) that is movably connected to the upper tube (31).

5. The steel reinforcement cage welding device according to claim 4, characterized in that: The top of the sleeve (41) near the inner gun barrel (3) is provided with a threaded inner ring (43) that matches and connects with the connecting thread (55) on the rotating sleeve (53).

Images