Welding seam back argon protection device

Abstract

The invention discloses a welding seam back argon protection device, and relates to the technical field of welding. The device comprises a workbench, a plurality of supports are symmetrically arranged on the workbench, rotating circular plates are arranged at the tops of the supports, rotating circular plates are arranged on the sides, close to each other, of every two adjacent supports, rotating mechanisms are arranged in the rotating circular plates, a first handle is arranged on the outer side of one support, and a second handle is arranged on the outer side of the other support. The first handle is connected with the rotating mechanism, the rotating mechanism comprises a U-shaped rotating frame and a second bevel gear rotationally arranged in a rotating circular plate, the bevel gear is arranged to drive the negative pressure pipe to do circular motion synchronous with the rotating frame, and therefore the function of conducting component collection on welding waste gas while welding is conducted is achieved; and adverse effects on the environment and operators caused by diffusion of welding waste gas to the periphery are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of welding, in particular to an argon gas protection device on the back side of a weld. Background Art

[0002] Argon gas protection on the back of the weld is a key process to prevent oxidation on the back of the high-temperature weld and ensure welding quality. It is especially suitable for welding easily oxidized materials such as stainless steel, aluminum alloy, and titanium alloy.

[0003] In the actual welding process, the direct injection method can provide sufficient protection. However, the welding process produces a lot of waste gas. The waste gas is mainly generated in the welding arc area, which contains metal vapor (such as iron and manganese), ozone, nitrogen oxides, etc. The temperature is relatively high. The metal scraps contained in the waste gas will stick everywhere after cooling and are difficult to clean. In addition, the traditional method for collecting these waste gases is to place the gas collection equipment in a fixed direction. It is impossible to collect and treat the waste gas generated by welding immediately, so the treatment effect is limited. Summary of the Invention

[0004] In order to solve the problem that traditional waste gas treatment methods cannot collect and treat the waste gas generated by welding in the first time, the purpose of the present invention is to provide an argon gas protection device on the back of the weld.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a weld back argon protection device, comprising a workbench: The workbench is symmetrically provided with multiple supports, and a rotating circular plate is provided on the top of the support, and a rotating circular plate is provided on the side where two adjacent supports are close to each other, and a rotating mechanism is provided in the rotating circular plate, and a handle is provided on the outer side of one of the supports, and the handle is connected to the rotating mechanism, and the rotating mechanism includes a "U"-shaped rotating frame and a bevel gear 2 rotatably arranged in the rotating circular plate, and the rotating frame is connected to the bevel gear 2, and a rotating groove and a rotating rod that can be connected to the rotating groove for circular rotation are provided on the side where two adjacent rotating frames are away from each other, a welding pipe is provided between the two adjacent rotating frames, and a placement cylinder for placing a welding gun is provided between the two adjacent rotating rods, and a negative pressure pump is also provided on the inner side of the rotating frame, and the suction end of the negative pressure pump is connected to the collecting mechanism, and the collecting mechanism is connected to the negative pressure pipe, and the negative pressure pipe is fixed to the rotating frame by providing a connecting bracket.

[0006] Preferably, a rotating bracket is rotatably provided on the inner wall of the collecting box, an activated carbon block for adsorbing exhaust gas is provided in the collecting box, a connecting rod is rotatably provided at the center position of the rotating bracket, a collecting cover is provided on the connecting rod, the collecting cover is one-third spherical, and a plurality of cooling grooves are circumferentially distributed on the inner wall of the collecting cover, a plurality of leakage holes are provided on the inner wall of the collecting cover between two adjacent cooling grooves, a driving fan blade connected to the connecting rod is provided at the center position of the inner wall of the collecting cover facing the suction end of the negative pressure pump, a handle 2 is slidably provided on the outer side of the collecting box, and a collecting pull plate is provided on one side of the handle 2 on the collecting box.

[0007] Preferably, an activated carbon block for absorbing exhaust gas is provided in the collection box.

[0008] Preferably, the air flow output end of the negative pressure pump is connected to an air blowing pipe, and the air blowing pipe is fixed on the rotating rod through a second connecting bracket.

[0009] Preferably, a plurality of slots are symmetrically provided in the middle of the rotating frame, a helical gear 1 which can be meshed with the helical gear 2 is provided in the slot, a driven wheel 1 is connected to the side of two adjacent helical gears 1 away from each other, the driven wheel 1 is connected to the driven wheel 2 through a transmission belt, the driven wheel 2 is connected to a lifting screw rod located on the inner side of the rotating frame, a lifting plug rod is threadedly connected to the lifting screw rod, a grinding clamp is connected to the top of the lifting plug rod, and a plurality of fixing pins are provided on the grinding clamp.

[0010] Preferably, multiple center rods are arranged between two adjacent rotating circular plates, one of which is connected to handle 1, and multiple threaded rods are symmetrically arranged on the center rod, which are respectively rotatably connected to bevel gear 2 and the rotating circular plate. An adjustment ring 1 and an adjustment ring 2 that can be threadedly connected to the threaded rod are provided on the center rod, and the adjustment ring 1 is slidably connected to the center rod. A limit rod 1 and a limit rod 2 are rotatably provided on the adjustment ring 2 and the adjustment ring 1, respectively, and an arc-shaped limit plate is rotatably provided on both the limit rod 1 and the limit rod 2.

[0011] Preferably, an air outlet circular plate and an air inlet circular plate that can be magnetically attracted to each other are provided at the center position of the center rod, a plurality of air holes are provided on the air outlet circular plate for gas circulation formed by the air chamber, a plurality of connecting wires are provided between the air inlet circular plate and the air outlet circular plate, and a receiving rod is slidably provided on the air inlet circular plate and the air outlet circular plate, and a limit plug is provided on one end of each of the two adjacent receiving rods close to each other, and the two adjacent limit plugs can cooperate with magnetic attraction, and a limit pin is provided on one of the limit plugs, and a socket that can be plugged into the limit pin one by one is provided on the other limit plug.

[0012] Preferably, a waste trough for receiving welding waste is provided at the center of the workbench.

[0013] Preferably, an argon tank is provided on one side of the workbench.

[0014] Preferably, the output end of the argon gas tank passes through the air inlet circular plate, the rotating circular plate and the threaded rod, and the output end port of the argon gas tank is located between the air inlet circular plate and the air outlet circular plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting the helical gear, the helical gear drives the negative pressure pipe to do circular motion synchronously with the rotating frame, so as to realize the function of collecting the components of welding exhaust gas while welding, and prevent the welding exhaust gas from spreading to the surroundings and causing adverse effects on the environment and operators; 2. By setting up an arc-shaped limit plate, the limit rod 1 and the limit rod 2 are extended to drive the arc-shaped limit plate to be close to or away from the workpiece to be welded, so as to complete the fixation and disassembly of the welded workpiece. The operation is simple and convenient. At the same time, the limit rod 1 and the limit rod 2 can also be used to fix and weld welded workpieces of different diameters; 3. By setting up an argon tank to release argon, a flowing argon chamber is formed between the air inlet circular plate and the air outlet circular plate. Before this, the distance between the air inlet circular plate and the air outlet circular plate is controlled to an appropriate distance to ensure that the argon chamber can avoid oxygen contamination of the back of the weld while minimizing the waste caused by the continuous introduction of argon. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a side structural schematic diagram of the present invention.

[0019] Figure 3 Schematic diagram of the internal structure of the welded pipe of the present invention.

[0020] Figure 4 It is a schematic diagram of the structure of the negative pressure tube of the present invention.

[0021] Figure 5 This is a structural diagram of the welded pipe connection of the present invention.

[0022] Figure 6This is a schematic diagram of the limit plug structure of the present invention.

[0023] Figure 7 This is a schematic diagram of the center rod structure of the present invention.

[0024] Figure 8 This is a schematic diagram of the internal structure of the collection box of the present invention.

[0025] Figure 9 This is a structural schematic diagram of the connection between the air blowing pipe and the connecting bracket of the present invention.

[0026] Figure: 1, workbench; 2, argon tank; 3, waste tank; 4, support; 5, handle 1; 6, rotating circular plate; 61, rotating groove; 610, arc-shaped limit plate; 611, adjusting ring 2; 612, limit rod 1; 613, adjusting ring 1; 614, limit rod 2; 616, slot; 62, rotating rod; 63, rotating frame; 64, driven wheel 1; 65, bevel gear 1; 66, driven wheel 2; 661, lifting screw rod; 662, lifting plug rod; 663, grinding plate; 664, fixing pin ; 67. Bevel gear 2; 68. Threaded rod; 69. Center rod; 691. Air inlet circular plate; 692. Air outlet circular plate; 693. Connecting wire; 694. Limit plug plate; 695. Limit plug pin; 7. Negative pressure pump; 71. Collection box; 711. Rotating bracket; 712. Collection cover; 713. Cooling trough; 714. Leakage hole; 715. Collection pull plate; 72. Handle 2; 73. Negative pressure pipe; 8. Welding pipe; 9. Placement tube; 91. Connecting bracket 1; 92. Connecting bracket 2; 93. Blowing pipe. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example: Figure 1-8 As shown, the present invention provides an argon gas protection device for the back side of a weld, which includes a workbench 1.

[0029] according to Figure 1 、 Figure 7 and Figure 9As shown, the workbench 1 is symmetrically provided with a plurality of supports 4, the top of the supports 4 is provided with a rotating circular plate 6, and the sides of the two adjacent supports 4 close to each other are provided with a rotating circular plate 6, and a rotating mechanism is provided in the rotating circular plate 6, and a handle 1 5 is provided on the outside of one of the supports 4, and the handle 1 5 is connected to the rotating mechanism, and the rotating mechanism includes a "U"-shaped rotating frame 63 and a bevel gear 2 67 that is rotatably provided in the rotating circular plate 6, and the rotating frame 63 is connected to the bevel gear 2 67, and the adjacent two The rotating frames 63 are provided with a rotating groove 61 and a rotating rod 62 that can be connected to the rotating groove 61 in a circular rotation on one side away from each other. A welding pipe 8 is provided between two adjacent rotating frames 63, and a placement tube 9 for placing a welding gun is provided between two adjacent rotating rods 62. A negative pressure pump 7 is also provided on the inner side of the rotating frame 63. The suction end of the negative pressure pump 7 is connected to a collecting mechanism, and the collecting mechanism is connected to a negative pressure pipe 73, and the negative pressure pipe 73 is fixed to the rotating frame 63 by providing a connecting bracket 91.

[0030] The air flow output end of the negative pressure pump 7 is connected to an air blowing pipe 93 , and the air blowing pipe 93 is fixed to the rotating rod 62 via a second connecting bracket 92 .

[0031] A rotating bracket 711 is rotatably provided on the inner wall of the collecting box 71, an activated carbon block is provided in the collecting box 71, a connecting rod is rotatably provided at the center position of the rotating bracket 711, a collecting cover 712 is provided on the connecting rod, the collecting cover 712 is one-third spherical, and a plurality of cooling grooves 713 are circumferentially distributed on the inner wall of the collecting cover 712, a plurality of leakage holes 714 are provided on the inner wall of the collecting cover 712 between two adjacent cooling grooves 713, a driving fan blade connected to the connecting rod is provided at the center position of the inner wall of the collecting cover 712 facing the suction end of the negative pressure pump 7, a handle 2 72 is slidably provided on the outer side of the collecting box 71, a collecting pull plate 715 is provided on one side of the handle 2 72 on the collecting box 71, and the negative pressure generated by the negative pressure pump 7 sucks the welding waste gas into the collecting box 71 When the exhaust gas enters the collection box 71, it will drive the fan blades to rotate, and then drive the collection cover 712 to rotate. During the rotation, the collection cover 712 continuously contacts the high-temperature substances in the exhaust gas. By setting the cooling groove 713, the contact area of ​​the high-temperature substances is increased, so that they can be quickly cooled. The continuous rotation of the collection cover 712 makes the position of the high-temperature substances on the collection cover 712 constantly change, so as to ensure that the high-temperature substances do not accumulate and the cooling rate can be accelerated during the continuous rotation. By setting multiple collection covers 712, the high-temperature substances can be cooled and screened at multiple levels. The cooled welding waste falls into the collection pull plate 715 and is collected by pulling the handle 72 to prevent the fine debris in the waste from being dispersed into the air with the airflow and causing damage to the precision machinery.

[0032] During actual use, the welding gun is placed on the placement tube 9, and after selecting the welding point, the welding gun is aimed at the weld between the two welding pipes. During the continuous welding process, the welding gun performs circular welding on the surfaces of the two welding pipes. The welding gun and the placement tube 9 drive the rotating rod 62 and the bevel gear 2 67 connected to the rotating rod 62 to move during the continuous circular motion, and then drive the entire rotating frame 63 through the bevel gear 2 67. During the rotation process, the rotating frame 63 drives the negative pressure tube 73 to perform circular motion synchronously with the rotating frame 63. When the welding gun performs slow circular rotation to ensure the stability of welding, it also drives the negative pressure tube 73 to rotate synchronously with it. On the one hand, it ensures that the pipeline of the negative pressure tube 73 will not be entangled due to rapid rotation. On the other hand, it can also realize the function of collecting components of welding exhaust gas while welding, thereby avoiding the diffusion of welding exhaust gas to the surroundings and causing adverse effects on the environment and operators.

[0033] according to Figure 1 、 Figure 2 and Figure 4 As shown, a plurality of slots 616 are symmetrically provided in the middle of the rotating frame 63, and a bevel gear 1 65 that can be meshed with the bevel gear 2 67 is provided in the slot 616. A driven wheel 1 64 is connected to the side away from each other of the two adjacent bevel gears 1 65. The driven wheel 1 64 is connected to the driven wheel 2 66 through a transmission belt. The driven wheel 2 66 is connected to a lifting screw rod 661 located on the inner side of the rotating frame 63. A lifting plug rod 662 is threadedly connected to the lifting screw rod 661. The top of the lifting plug rod 662 is connected to a grinding card plate 663. The grinding card plate 663 is provided with a plurality of fixing pins 664. During use, the lifting and lowering are first performed by rotating The length of the lifting rod 662 is adjusted by inserting the rod 662 until the grinding paper set on the grinding clamping plate 663 is gently pressed against the surface of the part to be welded. The circular rotation of the rotating frame 63 drives the bevel gear 2 67 and the bevel gear 1 65 to rotate. The bevel gear 1 65 further drives the driven wheel 1 64 and the driven wheel 2 66 to rotate during the rotation, so as to ensure that the welding gun drives the grinding paper to grind along the surface of the weldment while rotating in a circular motion, so as to perform preliminary grinding of the welding waste when it is not completely cooled and attached to the surface of the weldment, thereby reducing the difficulty of grinding the debris after it is completely cooled and solidified. At the same time, the air pipe 93 will also blow off the larger particles produced by grinding into the corresponding collection groove.

[0034] according to Figure 1 、 Figure 5 、 Figure 6 and Figure 7As shown, multiple center rods 69 are provided between two adjacent rotating circular plates 6, one of which is connected to the handle 1 5, and multiple threaded rods 68 are symmetrically provided on the center rod 69, which are respectively rotatably connected to the bevel gear 2 67 and the rotating circular plate 6, and an adjusting ring 1 613 and an adjusting ring 2 611 that can be threadedly connected to the threaded rod 68 are provided on the center rod 69. The adjusting ring 1 613 is slidably connected to the center rod 69, and a limit rod 1 612 and a limit rod 2 614 are rotatably provided on the adjusting ring 2 611 and the adjusting ring 1 613 respectively, and an arc-shaped limit plate 610 is rotatably provided on both the limit rod 1 612 and the limit rod 2 614.

[0035] The center position of the center rod 69 is provided with an air outlet circular plate 692 and an air inlet circular plate 691 that can be magnetically attracted to each other. The air outlet circular plate 692 is provided with a plurality of air holes for the gas circulation formed by the air chamber. A plurality of connecting wires 693 are provided between the air inlet circular plate 691 and the air outlet circular plate 692. A receiving rod is slidably provided on the air inlet circular plate 691 and the air outlet circular plate 692. A limiting plug 694 is provided at one end of each of the two adjacent receiving rods close to each other. The two adjacent limiting plugs 694 can cooperate with magnetic attraction, and a limiting pin 695 is provided on one of the limiting plugs 694, and a socket that can be plugged into the limiting pin 695 one by one is provided on the other limiting plug 694. In the actual operation process In the process, the two welding pipes to be welded are first inserted into the center rod 69, and the distance between the air inlet circular plate 691 and the air outlet circular plate 692 is controlled to an appropriate distance, and then the two adjacent limit plug plates 694 are plugged together. At this time, the adjustment ring 2 611 is fixed by hand while the handle 1 5 is turned. At this time, the adjustment ring 2 611 and the adjustment ring 1 613 move closer to or away from each other as the rotation direction of the handle 1 5 changes, thereby driving the limit rod 1 612 and the limit rod 2 614 to extend or contract, and finally driving the arc limit plate 610 to be close to or away from the workpiece to be welded, thereby completing the fixation and disassembly of the weldment. At the same time, the extension distance of the limit rod 1 612 and the limit rod 2 614 can also be adjusted to weld weldments of different pipe diameters.

[0036] according to Figure 1 and Figure 2 As shown, a waste trough 3 for holding welding waste is provided at the center of the workbench 1, and an argon tank 2 is provided on one side of the workbench 1. The output end of the argon tank 2 passes through the air inlet circular plate 691, the rotating circular plate 6 and the threaded rod 68, and the output end port of the argon tank 2 is located between the air inlet circular plate 691 and the air outlet circular plate 692, so that argon is released through the argon tank 2 to form a flowing argon gas chamber between the air inlet circular plate 691 and the air outlet circular plate 692.

[0037] Working principle: First, argon is released through the argon tank 2 to form a flowing argon chamber between the air inlet circular plate 691 and the air outlet circular plate 692. Before this, the distance between the air inlet circular plate 691 and the air outlet circular plate 692 is controlled to an appropriate distance to ensure that the argon chamber can avoid oxygen contamination of the back of the weld while minimizing the waste caused by the continuous introduction of argon.

[0038] By turning the handle 1 5 and fixing the adjustment ring 2 611 by hand at the same time, the adjustment ring 2 611 and the adjustment ring 1 613 move closer to each other along the rotation direction of the handle 1 5, thereby driving the limit rod 1 612 and the limit rod 2 614 to extend, and then driving the arc-shaped limit plate 610 to be close to the workpiece to be welded, completing the fixation of the welded workpiece. At the same time, the extension distance of the limit rod 1 612 and the limit rod 2 614 can also be adjusted to weld weldments of different pipe diameters.

[0039] Place the welding gun on the placement tube 9, select the welding point and aim the welding gun at the weld between the two welding pipes. During the continuous welding process, the welding gun performs circular welding on the surfaces of the two welding pipes. The welding gun and the placement tube 9 drive the negative pressure tube 73 to perform circular motion synchronously with the rotating frame 63 during the continuous circular motion, thereby realizing the function of collecting the components of the welding exhaust gas while welding, avoiding the welding exhaust gas from spreading to the surroundings and causing adverse effects on the environment and operators.

[0040] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0041] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A weld back argon protection device, comprising a workbench (1), characterized in that: A plurality of supports (4) are symmetrically arranged on the workbench (1), a rotating circular plate (6) is arranged on the top of the supports (4), and a rotating circular plate (6) is arranged on the side close to each other of two adjacent supports (4), and a rotating mechanism is arranged in the rotating circular plate (6), and a handle (5) is arranged on the outside of one of the supports (4), and the handle (5) is connected to the rotating mechanism, and the rotating mechanism includes a "U"-shaped rotating frame (63) and a bevel gear (67) rotatably arranged in the rotating circular plate (6), and the rotating frame (63) is connected to the bevel gear (67), and the adjacent two supports (4) are arranged on the side close to each other. A rotating groove (61) and a rotating rod (62) capable of being connected to the rotating groove (61) in a circumferential rotation are provided on one side of the rotating frame (63) away from each other. A welding pipe (8) is provided between two adjacent rotating frames (63). A placement cylinder (9) for placing a welding gun is provided between two adjacent rotating rods (62). A negative pressure pump (7) is also provided on the inner side of the rotating frame (63). The suction end of the negative pressure pump (7) is connected to a collecting mechanism. The collecting mechanism is connected to a negative pressure pipe (73), and the negative pressure pipe (73) is fixed to the rotating frame (63) by providing a connecting bracket (91).

2. The argon gas protection device for the back side of a weld according to claim 1, characterized in that: A rotating bracket (711) is rotatably provided on the inner wall of the collecting box (71), a connecting rod is rotatably provided at the center position of the rotating bracket (711), a collecting cover (712) is provided on the connecting rod, the collecting cover (712) is in the shape of one-third of a sphere, and a plurality of cooling grooves (713) are circumferentially distributed on the inner wall of the collecting cover (712), a plurality of leakage holes (714) are provided on the inner wall of the collecting cover (712) between two adjacent cooling grooves (713), a driving fan blade connected to the connecting rod is provided at the center position of the inner wall of the collecting cover (712) facing the suction end of the negative pressure pump (7), a handle 2 (72) is slidably provided on the outer side of the collecting box (71), and a collecting pull plate (715) is provided on one side of the handle 2 (72) on the collecting box (71).

3. The argon gas protection device for the back side of a weld according to claim 1, characterized in that: An activated carbon block for absorbing waste gas is provided in the collecting box (71).

4. The argon gas protection device for the back side of a weld according to claim 1, characterized in that: The air flow output end of the negative pressure pump (7) is connected to an air blowing pipe (93), and the air blowing pipe (93) is fixed to the rotating rod (62) through the second connecting bracket (92).

5. The argon gas protection device for the back side of a weld according to claim 1, characterized in that: A plurality of slots (616) are symmetrically arranged in the middle of the rotating frame (63), and a bevel gear 1 (65) capable of meshing with the bevel gear 2 (67) is arranged in the slot (616). A driven wheel 1 (64) is connected to the side away from each other of two adjacent bevel gears 1 (65), and the driven wheel 1 (64) is connected to the driven wheel 2 (66) through a transmission belt. The driven wheel 2 (66) is connected to a lifting screw rod (661) located on the inner side of the rotating frame (63), and a lifting plug rod (662) is threadedly connected to the lifting screw rod (661). The top of the lifting plug rod (662) is connected to a grinding card plate (663), and the grinding card plate (663) is provided with a plurality of fixing pins (664) for fixing.

6. The argon gas protection device for the back side of a weld according to claim 1, characterized in that: A plurality of center rods (69) are provided between two adjacent rotating circular plates (6), wherein one of the center rods (69) is connected to the handle 1 (5), and a plurality of threaded rods (68) are symmetrically provided on the center rod (69) and are respectively rotatably connected to the bevel gear 2 (67) and the rotating circular plate (6), and an adjustment ring 1 (613) and an adjustment ring 2 (611) capable of being threadedly connected to the threaded rod (68) are provided on the center rod (69), and the adjustment ring 1 (613) is slidably connected to the center rod (69), and a limit rod 1 (612) and a limit rod 2 (614) are rotatably provided on the adjustment ring 2 (611) and the adjustment ring 1 (613), respectively, and an arc-shaped limit plate (610) is rotatably provided on both the limit rod 1 (612) and the limit rod 2 (614).

7. The argon gas protection device for the back side of a weld according to claim 6, characterized in that: An outlet circular plate (692) and an inlet circular plate (691) that can be magnetically attracted to each other are provided at the center position of the center rod (69), and a plurality of air holes are provided on the outlet circular plate (692) for gas circulation formed by the air chamber, and a plurality of connecting wires (693) are provided between the inlet circular plate (691) and the outlet circular plate (692). A receiving rod is slidably provided on the inlet circular plate (691) and the outlet circular plate (692), and a limiting plug plate (694) is provided at one end of each of the two adjacent receiving rods close to each other. The two adjacent limiting plug plates (694) can cooperate with each other to attract each other, and a limiting pin (695) is provided on one of the limiting plug plates (694), and a socket that can be plugged into the limiting pin (695) in a one-to-one correspondence is provided on the other limiting plug plate (694).

8. The argon gas protection device for the back side of a weld according to claim 1, characterized in that: A waste trough (3) for receiving welding waste is provided at the center of the workbench (1).

9. The argon gas protection device for the back side of a weld according to claim 1, characterized in that: An argon gas tank (2) is provided on one side of the workbench (1).

10. The argon gas protection device for the back side of a weld according to claim 1, characterized in that: The output end of the argon gas tank (2) passes through the air inlet circular plate (691), the rotating circular plate (6) and the threaded rod (68), and the output end port of the argon gas tank (2) is located between the air inlet circular plate (691) and the air outlet circular plate (692).

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