A nitrogen spring cylinder welding device and welding method

Abstract

The application relates to the technical field of cylinder welding, and discloses a nitrogen spring cylinder welding device and a welding method, wherein the welding device comprises a workbench, a rotary driving mechanism, a clamping mechanism and a welding gun are arranged on the workbench, the rotary driving mechanism drives the clamping mechanism to rotate, the clamping mechanism is used for clamping two groups of workpieces, the two groups of workpieces are butted at the ends to form a weld, and the welding gun is used for welding the weld; a moving assembly and a conductive sheet connected to the driving end of the moving assembly are arranged on the workbench; the integrated arc striking piece is composed of a ceramic supporting plate and a metal arc striking plate, the sharp curved surface of the metal arc striking end is used for striking an electric arc, the curved surface of the ceramic supporting plate supports a molten pool and directionally guides the molten pool into the weld; the ceramic does not adhere to the molten metal, the three-axis moving sliding table can be integrally withdrawn from the arc striking piece before the molten pool is solidified, the arc striking plate does not need to be cut and polished in the later period, and the welding device is suitable for annular closed weld welding.

Description

Technical Field

[0001] This invention belongs to the field of cylinder welding technology, specifically relating to a nitrogen spring cylinder welding device and welding method. Background Technology

[0002] The core component of a nitrogen spring is a hollow cylindrical cylinder. During production, the ends of two tubular cylinder sections need to be joined together to complete a gas-shielded arc welding operation for a circumferential butt weld. Existing circumferential weld equipment faces several intractable technical challenges in actual production, as follows: Arc welding suffers from poor arc stability at the moment of initiation, easily leading to welding defects such as porosity, lack of fusion, and slag inclusions. The industry standard solution is to install an arc-starting plate to transfer these defects to the plate for later removal. However, nitrogen spring cylinders have closed circumferential welds, and the welding start point interferes with the arc-starting plate at the end of the weld, making it impossible to use a conventional steel plate arc-starting plate. If a metal arc-starting block is directly attached to the weld surface, it will fuse and stick to the circumferential weld after welding, requiring extensive grinding and cleaning, and easily damaging the cylinder base material, severely affecting the product's sealing performance and appearance quality. Summary of the Invention

[0003] The purpose of this invention is to provide a welding device with a simple structure and reasonable design in order to solve the above-mentioned problems.

[0004] The present invention achieves the above objectives through the following technical solutions: This invention provides a nitrogen spring cylinder welding device, including a worktable, on which a rotary drive mechanism, a clamping mechanism and a welding torch are provided. The rotary drive mechanism drives the clamping mechanism to rotate. The clamping mechanism is used to clamp two sets of workpieces. The ends of the two sets of workpieces are joined together to form a weld. The welding torch is used to weld the weld. The workbench is provided with a moving component and a conductive sheet connected to the driving end of the moving component. The moving component drives the conductive sheet to adhere to the surface of the workpiece, and the conductive sheet is electrically connected to the negative terminal of the welding power source. The workbench is equipped with an arc-starting component and a three-axis moving slide. The arc-starting component includes a support plate and an arc-starting plate embedded in the support plate. A conductive component is provided on the side of the arc-starting plate away from the welding torch. The conductive component is electrically connected to the negative terminal of the welding power source. The three-axis moving slide drives the arc-starting component to move so that the end of the arc-starting component facing the workpiece extends into the weld and is located below the welding torch. The arc-starting plate is used to ignite the electric arc output by the welding torch, and the support plate is used to guide the molten pool generated by the electric arc melting the welding wire into the interior of the weld.

[0005] As a further optimization of the present invention, the clamping mechanism consists of two sets of three-jaw chucks, which clamp two sets of workpieces respectively. The rotary drive mechanism consists of two sets of rotary drive components, with the two sets of three-jaw chucks respectively connected to the drive ends of the two sets of rotary drive components.

[0006] As a further optimization of the present invention, the rotary drive assembly includes a rotary motor, a driven bevel gear, and a support frame disposed on the worktable. The three-jaw chuck is rotatably connected to the inner wall of the corresponding support frame. The three-jaw chuck is coaxially and fixedly connected to the driven bevel gear. The rotary motor is connected to the outer surface of the support frame. The drive end of the rotary motor extends into the support frame and is fixedly connected to a driving bevel gear. The driving bevel gear meshes with the driven bevel gear.

[0007] As a further optimization of the present invention, the ends of the support plate and the arc-starting plate facing the workpiece are both narrowed pointed ends, and the surfaces of the support plate and the arc-starting plate with pointed ends are arc surfaces, and the two arc surfaces of the support plate and the arc-starting plate are connected to each other.

[0008] As a further optimization of the present invention, the moving component includes a driving component and a support column connected to the worktable. Two sets of parallel connecting rods are rotatably connected to the surface of the support column. Fixed blocks are fixedly connected to both ends of the conductive sheet on the side facing away from the workpiece. The ends of the two sets of connecting rods away from the support column are rotatably connected to the surfaces of the two sets of fixed blocks respectively. The driving end of the driving component is rotatably connected to the surface of the lower connecting rod. The end of the driving component away from the driving end is rotatably connected to the surface of the support column. The conductive sheet is electrically connected to the negative electrode of the welding power supply through a first wire.

[0009] As a further optimization of the present invention, the drive end of the three-axis moving slide is connected to a replacement component, and multiple sets of arc-inducing components are provided. The replacement component includes a support frame and a mounting frame. The support frame is connected to the drive end of the three-axis moving slide. A support plate is connected to the lower side of the mounting frame. A push groove communicating with the inside of the mounting frame is opened on the surface of the support plate facing the mounting frame. Multiple sets of arc-inducing components are vertically stacked and located inside the mounting frame. The bottommost set of arc-inducing components is located in the push groove. A pusher plate is slidably connected inside the pusher groove. The end of the pusher plate away from the workpiece extends outside the pusher groove. A drive plate is connected to the surface of the pusher plate outside the pusher groove. A second linear drive component is connected to the surface of the mounting frame. The drive plate is connected to the drive end of the second linear drive component.

[0010] As a further optimization of the present invention, the replacement component also includes a baffle that can be detachably connected to the upper end of the mounting frame. A pressure post is provided on the baffle. One end of the pressure post facing the arc-starting member extends into the mounting frame and is fixedly connected to a pressure plate. A pressure spring is sleeved on the outer side of the pressure post inside the mounting frame. The two ends of the pressure spring are respectively connected to the pressure plate and the baffle. The pressure plate presses against the surface of the uppermost arc-starting member inside the mounting frame.

[0011] As a further optimization of the present invention, the surface of the support plate facing the workpiece is rotatably connected to a limiting member. The limiting member includes a rotating frame and rotating plates rotatably connected to both sides of the support plate. The two ends of the rotating frame are connected to two sets of rotating plates. A limiting block is connected to the inner wall of the rotating frame. Limiting grooves that cooperate with the limiting blocks are opened on both sides of the support plate. A second driving member is rotatably connected to the outer surface of the mounting frame. The driving end of the second driving member is rotatably connected to one set of rotating plates. One set of rotating plates is electrically connected to the negative terminal of the welding power supply through a second wire.

[0012] As a further optimization of the present invention, the conductive component includes a conductor and an elastic sheet. The push plate has a placement groove on one side surface located in the push groove. The conductor is slidably connected in the placement groove. One side of the elastic sheet is connected to the side surface of the conductor located in the placement groove, and the other side is connected to the inner wall of the placement groove. The conductor is in contact with the arc-starting plate located in the push groove. The elastic sheet is electrically connected to the negative electrode of the welding power supply through a second wire.

[0013] A second aspect of the present invention provides a method for welding a nitrogen spring cylinder body, employing the nitrogen spring cylinder body welding apparatus described above, comprising the following steps: The clamping mechanism clamps two sets of workpieces, and the ends of the two sets of workpieces are joined together to form a weld. The moving component drives the conductive sheet to adhere to the outer wall of the cylinder, and the conductive sheet is connected to the negative terminal of the welding power supply to form a conductive circuit. The three-axis moving slide table drives the arc-starting component to move, so that the end of the arc-starting component extends into the weld and is placed below the welding gun. The conductive component and the arc-starting plate are connected to the negative electrode of the welding power supply. The welding torch initiates an arc on the metal arc-starting plate, and the molten pool flows into the weld through the support plate. Before the molten pool solidifies, the three-axis moving slide removes the arc-starting component from the weld. The rotary drive assembly drives the cylinder to rotate, and the welding torch completes the welding of the entire circumferential weld seam.

[0014] The beneficial effects of this invention are as follows: This invention uses a ceramic support plate combined with a metal arc-starting plate to form an integrated arc-starting component. The sharp curved surface of the metal arc-starting end is used to ignite the electric arc, and the curved surface of the ceramic support plate receives the molten pool and guides the flow into the weld. The ceramic does not adhere to the molten metal, and the arc-starting component can be completely removed from the three-axis moving slide before the molten pool solidifies, eliminating the need for subsequent cutting and grinding of the arc-starting plate. It is suitable for welding annular closed welds, eliminating arc porosity and incomplete fusion defects from the source, and improving the weld sealing performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the position of the limiting element in this invention; Figure 3 This is a schematic diagram of the arc-starting component of the present invention; Figure 4 This is a schematic diagram of the structure of the rotary drive assembly of the present invention; Figure 5 This is a schematic diagram of the structure of the moving component of the present invention; Figure 6 This is a schematic diagram showing the position of the second linear drive component of the present invention; Figure 7 This is a schematic diagram of the structure of the replacement component of the present invention; Figure 8 This is a schematic diagram of the structure of the conductive component of the present invention.

[0016] In the diagram: 1. Worktable; 2. Rotary drive assembly; 21. Rotary motor; 22. Driven bevel gear; 23. Driving bevel gear; 24. Support frame; 3. Clamping mechanism; 31. Three-jaw chuck; 4. Welding torch; 5. Moving assembly; 51. Drive component one; 52. Support column; 53. Linkage rod; 54. Fixing block; 6. Conductive sheet; 7. Arc ignition component; 71. Support plate; 72. Arc ignition plate; 8. Three-axis moving slide; 9. Conductive assembly; 91. Conductor; 92. 10. Elastic sheet; 11. First linear drive component; 11. Replacement component; 111. Support frame; 112. Mounting frame; 113. Support plate; 114. Push plate; 115. Drive plate; 116. Baffle; 117. Pressing column; 118. Pressing plate; 119. Pressing spring; 12. Second linear drive component; 13. Limiting component; 131. Rotating frame; 132. Rotating plate; 133. Limiting block; 134. Drive component two; 14. Three-axis welding torch moving mechanism. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0018] Example 1; refer to Figures 1 to 3 The structure shown is a nitrogen spring cylinder welding device, including a worktable 1. The worktable 1 is provided with a rotary drive mechanism, a clamping mechanism 3 and a welding torch 4. The rotary drive mechanism drives the clamping mechanism 3 to rotate. The clamping mechanism 3 is used to clamp two sets of workpieces. The ends of the two sets of workpieces are joined together to form a weld. The welding torch 4 is used to weld the weld. The workbench 1 is provided with a moving component 5 and a conductive sheet 6 connected to the driving end of the moving component 5. The moving component 5 drives the conductive sheet 6 to adhere to the surface of the workpiece. The conductive sheet 6 is electrically connected to the negative terminal of the welding power supply. The workbench 1 is equipped with an arc-starting component 7 and a three-axis moving slide 8. The arc-starting component 7 includes a support plate 71 and an arc-starting plate 72 embedded in the support plate 71. A conductive component 9 is provided on the side of the arc-starting plate 72 away from the welding torch 4. The conductive component 9 is electrically connected to the negative terminal of the welding power supply. The three-axis moving slide 8 drives the arc-starting component 7 to move so that the end of the arc-starting component 7 facing the workpiece extends into the weld and is located below the welding torch 4. The arc-starting plate 72 is used to ignite the electric arc output by the welding torch 4. The support plate 71 is used to guide the molten pool generated by the electric arc melting the welding wire into the interior of the weld.

[0019] Specifically, the worktable 1 is provided with a three-axis welding torch moving mechanism 14 for driving the welding torch 4 to move in the three directions of X-axis, Y-axis and Z-axis. The three-axis welding torch moving mechanism 14 and the three-axis moving slide 8 are existing equipment, so they will not be described in detail in this embodiment.

[0020] It should be noted that the support plate 71 is made of ceramic material; the arc-inducing plate 72 is made of metal material, specifically, it can be copper, steel, aluminum, etc.

[0021] It should be further noted that the welding torch (including the contact tip / welding wire) is electrically connected to the positive terminal of the welding power source.

[0022] Furthermore, the clamping mechanism 3 consists of two sets of three-jaw chucks 31, which clamp two sets of workpieces respectively. The rotary drive mechanism consists of two sets of rotary drive components 2, with the two sets of three-jaw chucks 31 connected to the drive ends of the two sets of rotary drive components 2 respectively.

[0023] refer to Figure 4 As shown in the partial structure, the rotary drive assembly 2 includes a rotary motor 21, a driven bevel gear 22, and a support frame 24 disposed on the worktable 1. The three-jaw chuck 31 is rotatably connected to the inner wall of the corresponding support frame 24. The three-jaw chuck 31 is coaxially and fixedly connected to the driven bevel gear 22. The rotary motor 21 is connected to the outer surface of the support frame 24. The drive end of the rotary motor 21 extends into the support frame 24 and is fixedly connected to a driving bevel gear 23. The driving bevel gear 23 meshes with the driven bevel gear 22.

[0024] Specifically, a first linear drive 10 is connected to the workbench 1, wherein a set of support frames 24 are connected to the drive end of the first linear drive 10, and another set of support frames 24 are fixedly connected to the surface of the workbench 1 by a fixing rod. The first linear drive 10 can be any kind of mechanical structure capable of linear motion, such as a lead screw module, an electric push rod, a hydraulic cylinder, etc.

[0025] It should be noted that the driven bevel gear 22 is arranged in a ring shape; the rotary motor 21 is a servo motor, stepper motor, etc.; in actual use, the drive rotary motor 21 drives the drive bevel gear 23 to rotate, the drive bevel gear 23 drives the driven bevel gear 22 to rotate, the driven bevel gear 22 drives the three-jaw chuck 31 to rotate, and the three-jaw chuck 31 drives the clamped tubular workpiece to rotate.

[0026] refer to Figure 3 As shown in the partial structure, the end of the support plate 71 and the arc-starting plate 72 facing the workpiece are both narrowed pointed ends. The surfaces of the support plate 71 and the arc-starting plate 72 with pointed ends are arc surfaces, and the two arc surfaces of the support plate 71 and the arc-starting plate 72 are connected to each other.

[0027] In practical use, two sets of three-jaw chucks 31 are activated to clamp two sets of workpieces respectively. Then, the first linear drive unit 10 drives one set of three-jaw chucks 31 and moves the corresponding workpiece to the other set of workpieces, so that the ends of the two sets of workpieces are joined together, forming a weld seam at the joint. Next, the three-axis welding torch moving mechanism 14 is activated to move the welding torch 4 to above the position corresponding to the weld seam. Then, the three-axis moving slide 8 is activated to move the pointed end of the arc-starting plate 72 into the weld seam. Then, the welding torch 4 is activated, and the pointed end of the arc-starting plate 72 ignites the arc output by the welding torch 4. The output arc melts the welding wire, melting... The molten welding wire, as a molten pool, first flows to the pointed end of the arc-starting plate 72. Since the surfaces of the pointed ends of the arc-starting plate 72 and the support plate 71 are curved, the molten pool on the arc-starting plate 72 flows to the surface of the pointed end of the support plate 71, and finally flows into the weld. Since the support plate 71 is made of ceramic, the molten pool will not remain on the surface of the support plate 71. Before the molten pool in the weld solidifies, the support plate 71 is removed from the weld. Then, the rotary drive assembly 2 is activated to drive the corresponding three-jaw chuck 31 to rotate the workpiece, so that the welding torch 4 welds around the weld.

[0028] refer to Figure 5 As shown in the partial structure, the moving component 5 includes a drive component 51 and a support column 52 connected to the worktable 1. Two sets of parallel connecting rods 53 are rotatably connected to the surface of the support column 52. The conductive sheet 6 has fixed blocks 54 at both ends on the side of its surface away from the workpiece. The ends of the two sets of connecting rods 53 away from the support column 52 are rotatably connected to the surfaces of the two sets of fixed blocks 54, respectively. The drive end of the drive component 51 is rotatably connected to the surface of the lower connecting rod 53, and the end of the drive component 51 away from the drive end is rotatably connected to the surface of the support column 52. The conductive sheet 6 is electrically connected to the negative electrode of the welding power supply through a first wire.

[0029] It should be noted that the drive component 51 is an electric push rod, hydraulic cylinder, pneumatic cylinder, etc. Before starting the welding torch 4, the drive component 51 needs to be started. The drive component 51 drives the parallel connecting rod 53, so that the conductive sheet 6 is attached to the surface of the workpiece.

[0030] refer to Figure 6 and Figure 7 As shown in the partial structure, the drive end of the three-axis moving slide 8 is connected to a replacement component 11. Multiple sets of arc-inducing components 7 are provided. The replacement component 11 includes a support frame 111 and a mounting frame 112. The support frame 111 is connected to the drive end of the three-axis moving slide 8. A support plate 113 is connected to the lower side of the mounting frame 112. The surface of the support plate 113 facing the mounting frame 112 has a push groove that communicates with the inside of the mounting frame 112. Multiple sets of arc-inducing components 7 are vertically stacked and located inside the mounting frame 112. The bottommost set of arc-inducing components 7 is located in the push groove. A pusher plate 114 is slidably connected inside the pusher groove. One end of the pusher plate 114 away from the workpiece extends outside the pusher groove. A drive plate 115 is connected to the surface of the pusher plate 114 outside the pusher groove. A second linear drive member 12 is connected to the surface of the mounting frame 112. The drive plate 115 is connected to the drive end of the second linear drive member 12.

[0031] The second linear drive component 12 can be any mechanical structure capable of linear motion, such as a lead screw module, an electric push rod, or a hydraulic cylinder.

[0032] It should be noted that the arc-starting component 7 will wear out over time. Therefore, multiple sets of arc-starting components 7 are provided. When one set of arc-starting components 7 fails to function properly, it can be replaced by other arc-starting components 7.

[0033] Furthermore, the replacement component 11 also includes a baffle 116 detachably connected to the upper end of the mounting frame 112. A pressing post 117 is provided on the baffle 116. One end of the pressing post 117 facing the arc-drawing member 7 extends into the mounting frame 112 and is fixedly connected to a pressing plate 118. A pressing spring 119 is sleeved on the outer side of the pressing post 117 inside the mounting frame 112. The two ends of the pressing spring 119 are respectively connected to the pressing plate 118 and the baffle 116. The pressing plate 118 presses against the surface of the uppermost arc-drawing member 7 inside the mounting frame 112.

[0034] It should be noted that the two ends of the baffle 116 can be connected to the two sides of the mounting frame 112 by bolts or screws. The baffle 116 is designed to be detachable, which makes it easy for operators to replenish new arc-inducing parts 7 in batches. The pressure spring 119 continuously applies downward pressure to the pressure plate 118, pressing all the stacked arc-inducing parts 7 tightly together to prevent the stacked parts from becoming loose, shifting, or jamming, and to ensure that the bottom set of arc-inducing parts 7 falls stably into the push groove of the support plate 113.

[0035] Furthermore, a limiting member 13 is rotatably connected to the surface of the support plate 113 facing the workpiece. The limiting member 13 includes a rotating frame 131 and rotating plates 132 rotatably connected to both sides of the support plate 113. The two ends of the rotating frame 131 are connected to two sets of rotating plates 132. A limiting block 133 is connected to the inner wall of the rotating frame 131. Limiting grooves that cooperate with the limiting blocks 133 are opened on both sides of the support plate 71. A second driving member 134 is rotatably connected to the outer surface of the mounting frame 112. The driving end of the second driving member 134 is rotatably connected to one set of rotating plates 132. One set of rotating plates 132 is electrically connected to the negative terminal of the welding power supply through a second wire.

[0036] Among them, drive component 2 134 is an electric push rod, hydraulic cylinder, pneumatic cylinder, etc.

[0037] In practical use, the second linear drive 12 is activated, causing the drive plate 115 to drive the push plate 114 to slide along the push groove toward the side facing the workpiece. This pushes the pointed end of the arc-drawing component 7 out of the push groove until the inner wall of the limiting groove facing the workpiece abuts against the surface of the limiting block 133. At this point, the arc-drawing component 7 in the push groove can be used. When the arc-drawing component 7 in the push groove is damaged, the second drive 134 is activated to drive the rotating plate 132 and drive the rotating frame 131 to rotate. This causes the rotating frame 131 to move the limiting block 133 away from the push groove. At this point, the arc-drawing component 7 in the push groove can be directly pulled out of the push groove. After the second linear drive 12 drives the push plate 114 to reset, the next set of intact arc-drawing components 7 at the bottom of the mounting frame 112 is pushed into the push groove to perform the above-mentioned cyclic operation.

[0038] refer to Figure 8 As shown in the partial structure, the conductive component 9 includes a conductor 91 and an elastic sheet 92. The push plate 114 has a mounting groove on one side surface located in the push groove. The conductor 91 is slidably connected in the mounting groove. One side of the elastic sheet 92 is connected to the side surface of the conductor 91 located in the mounting groove, and the other side is connected to the inner wall of the mounting groove. The conductor 91 is in contact with the arc-starting plate 72 located in the push groove. The elastic sheet 92 is electrically connected to the negative electrode of the welding power supply through a second wire.

[0039] It should be noted that the second conductor is a "Y" shaped conductor. One end of the "Y" shaped conductor is connected to the negative terminal of the welding power supply, and the other two ends are connected to the elastic sheet 92 and the rotating plate 132 respectively. The elastic sheet 92 is "V" shaped.

[0040] In this embodiment, the rotating frame 131, the rotating plate 132, the conductor 91, and the elastic sheet 92 are all conductive metals, specifically copper, steel, aluminum, etc.

[0041] It should be further explained that a conductor 91 and an elastic sheet 92 are installed in the placement groove of the push plate 114. The elastic sheet 92 continuously pushes the conductor 91 outward, so that the conductor 91 tightly presses the arc-starting plate 72 in the push groove. The elastic sheet 92 is connected to the negative terminal of the welding power supply through the second wire. Together with the metal conduction structure of the limiting component 13, it doubles the guarantee of stable conductivity of the arc-starting plate 72, and eliminates defects such as poor conductivity, arc failure, and unstable arc caused by contact gaps and oxide layers.

[0042] Example 2; A method for welding a nitrogen spring cylinder body, using a nitrogen spring cylinder body welding apparatus as described in Example 1, includes the following steps: The clamping mechanism clamps two sets of workpieces, and the ends of the two sets of workpieces are joined together to form a weld. The moving component drives the conductive sheet to adhere to the outer wall of the cylinder, and the conductive sheet is connected to the negative terminal of the welding power supply to form a conductive circuit. The three-axis moving slide table drives the arc-starting component to move, so that the end of the arc-starting component extends into the weld and is placed below the welding gun. The conductive component and the arc-starting plate are connected to the negative electrode of the welding power supply. The welding torch initiates an arc on the metal arc-starting plate, and the molten pool flows into the weld through the support plate. Before the molten pool solidifies, the three-axis moving slide removes the arc-starting component from the weld. The rotary drive assembly drives the cylinder to rotate, and the welding torch completes the welding of the entire circumferential weld seam.

[0043] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A nitrogen spring cylinder welding device, characterized in that, The device includes a worktable, on which a rotary drive mechanism, a clamping mechanism, and a welding torch are provided. The rotary drive mechanism drives the clamping mechanism to rotate. The clamping mechanism is used to clamp two sets of workpieces. The ends of the two sets of workpieces are joined together to form a weld. The welding torch is used to weld the weld. The workbench is provided with a moving component and a conductive sheet connected to the driving end of the moving component. The moving component drives the conductive sheet to adhere to the surface of the workpiece, and the conductive sheet is electrically connected to the negative terminal of the welding power source. The workbench is equipped with an arc-starting component and a three-axis moving slide. The arc-starting component includes a support plate and an arc-starting plate embedded in the support plate. A conductive component is provided on the side of the arc-starting plate away from the welding torch. The conductive component is electrically connected to the negative terminal of the welding power source. The three-axis moving slide drives the arc-starting component to move so that the end of the arc-starting component facing the workpiece extends into the weld and is located below the welding torch. The arc-starting plate is used to ignite the electric arc output by the welding torch, and the support plate is used to guide the molten pool generated by the electric arc melting the welding wire into the interior of the weld.

2. The nitrogen spring cylinder welding device according to claim 1, characterized in that: The clamping mechanism consists of two sets of three-jaw chucks, which clamp two sets of workpieces respectively. The rotary drive mechanism consists of two sets of rotary drive components, with the two sets of three-jaw chucks connected to the drive ends of the two sets of rotary drive components respectively.

3. The nitrogen spring cylinder welding device according to claim 2, characterized in that: The rotary drive assembly includes a rotary motor, a driven bevel gear, and a support frame mounted on the worktable. The three-jaw chuck is rotatably connected to the inner wall of the corresponding support frame. The three-jaw chuck is coaxially and fixedly connected to the driven bevel gear. The rotary motor is connected to the outer surface of the support frame. The drive end of the rotary motor extends into the support frame and is fixedly connected to a driving bevel gear. The driving bevel gear meshes with the driven bevel gear.

4. The nitrogen spring cylinder welding device according to claim 1, characterized in that: Both the support plate and the arc-starting plate have narrowed pointed ends facing the workpiece. The surfaces of the support plate and the arc-starting plate with pointed ends are arc surfaces, and the two arc surfaces of the support plate and the arc-starting plate are connected to each other.

5. The nitrogen spring cylinder welding device according to claim 1, characterized in that: The moving component includes a drive unit and a support column connected to the worktable. Two sets of parallel connecting rods are rotatably connected to the surface of the support column. Fixed blocks are fixedly connected to both ends of the conductive sheet on the side facing away from the workpiece. The ends of the two sets of connecting rods away from the support column are rotatably connected to the surfaces of the two sets of fixed blocks, respectively. The drive end of the drive unit is rotatably connected to the surface of the lower connecting rod, and the end of the drive unit away from the drive end is rotatably connected to the surface of the support column. The conductive sheet is electrically connected to the negative terminal of the welding power supply through a first wire.

6. The nitrogen spring cylinder welding device according to claim 4, characterized in that: The drive end of the three-axis moving slide is connected to a replacement component. Multiple sets of arc-inducing components are provided. The replacement component includes a support frame and a mounting frame. The support frame is connected to the drive end of the three-axis moving slide. A support plate is connected to the lower side of the mounting frame. A push groove communicating with the inside of the mounting frame is opened on the surface of the support plate facing the mounting frame. Multiple sets of arc-inducing components are vertically stacked and located inside the mounting frame. The bottommost set of arc-inducing components is located in the push groove. A pusher plate is slidably connected inside the pusher groove. The end of the pusher plate away from the workpiece extends outside the pusher groove. A drive plate is connected to the surface of the pusher plate outside the pusher groove. A second linear drive component is connected to the surface of the mounting frame. The drive plate is connected to the drive end of the second linear drive component.

7. The nitrogen spring cylinder welding device according to claim 6, characterized in that: The replacement component also includes a baffle that can be detachably connected to the upper end of the mounting frame. A pressure post is provided on the baffle. One end of the pressure post extends into the mounting frame toward the arc-starting component and is fixedly connected to a pressure plate. A pressure spring is sleeved on the outer side of the pressure post inside the mounting frame. The two ends of the pressure spring are respectively connected to the pressure plate and the baffle. The pressure plate presses against the surface of the uppermost arc-starting component inside the mounting frame.

8. The nitrogen spring cylinder welding device according to claim 7, characterized in that: The support plate has a limiting component rotatably connected to the surface facing the workpiece. The limiting component includes a rotating frame and rotating plates rotatably connected to the two sides of the support plate. The two ends of the rotating frame are connected to two sets of rotating plates. A limiting block is connected to the inner wall of the rotating frame. Limiting grooves that cooperate with the limiting blocks are opened on the two sides of the support plate. A second driving component is rotatably connected to the outer surface of the mounting frame. The driving end of the second driving component is rotatably connected to one set of rotating plates. One set of rotating plates is electrically connected to the negative terminal of the welding power supply through a second wire.

9. A nitrogen spring cylinder welding device according to claim 8, characterized in that: The conductive component includes a conductor and an elastic sheet. The push plate has a mounting groove on one side surface inside the push groove. A conductor is slidably connected inside the mounting groove. One side of the elastic sheet is connected to the side surface of the conductor inside the mounting groove, and the other side is connected to the inner wall of the mounting groove. The conductor is in contact with the arc-starting plate inside the push groove. The elastic sheet is electrically connected to the negative electrode of the welding power supply through a second wire.

10. A method for welding a nitrogen spring cylinder body, using any one of the nitrogen spring cylinder body welding apparatuses according to claims 1-9, comprising the following steps: The clamping mechanism clamps two sets of workpieces, and the ends of the two sets of workpieces are joined together to form a weld. The moving component drives the conductive sheet to adhere to the outer wall of the cylinder, and the conductive sheet is connected to the negative terminal of the welding power supply to form a conductive circuit. The three-axis moving slide table drives the arc-starting component to move, so that the end of the arc-starting component extends into the weld and is placed below the welding gun. The conductive component and the arc-starting plate are connected to the negative electrode of the welding power supply. The welding torch initiates an arc on the metal arc-starting plate, and the molten pool flows into the weld through the support plate. Before the molten pool solidifies, the three-axis moving slide removes the arc-starting component from the weld. The rotary drive assembly drives the cylinder to rotate, and the welding torch completes the welding of the entire circumferential weld seam.

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