Stainless steel pipe fittings outer cladding protection welding device and welding process thereof

Abstract

The application discloses a stainless steel pipe fitting outer cladding protection welding device and a welding process thereof, and relates to the technical field of protection welding devices.The outer cladding protection welding device comprises a welding rack, a center square groove is arranged at the inner center position of the welding rack, and a pipe carrier seat is arranged in the center square groove; further comprising: a surrounding ring frame which is welded at the upper end position of the welding rack, the center point of the surrounding ring frame is coincided with the center point of the pipe carrier seat, two half-ring cover plates are arranged above the surrounding ring frame, and the two half-ring cover plates are symmetrically distributed about the center point of the surrounding ring frame, solving the problem that the existing welding protection device prevents oxidation by spraying protective gas at the welding position, but lacks effective surrounding mechanisms in the welding process, which easily causes the protective gas to be blown away by external airflow, and the structure of the pipe fitting cannot be automatically girth-welded in the welding process, thereby affecting the welding efficiency of the stainless steel tee pipe fitting.

Description

Technical Field

[0001] This invention relates to the field of protective welding devices, specifically to a protective welding device for stainless steel pipe fittings and its welding process. Background Technology

[0002] The stainless steel tee fitting external protective welding device is an auxiliary device used to protect stainless steel tees from oxidation during the welding process. It forms a closed space in the welding area and continuously introduces inert gases such as argon to prevent oxidation of the stainless steel surface at high temperatures and maintain the corrosion resistance of the weld area.

[0003] For example, announcement number CN213105215U, entitled "A Stainless Steel Pipe Welding Protection Device," includes a protection device body and a gas supply pipe. Two fixing plates are fixedly installed at the bottom of the inner part of the protection device body. Bearings are fixedly installed in the middle of each fixing plate. A rotating rod is fixedly connected to the side of the bearing away from the fixing plate. A locking block is embedded inside the rotating rod. A crank handle is fixedly installed on the left side of the locking block. A fixing ring is fixedly installed between the rotating rod and the crank handle. A gas supply pipe is embedded inside the fixing plate, surrounding the surface of the rotating rod. A circular cover is embedded on the side of the gas supply pipe away from the rotating rod. A fixing block is fixedly installed in the middle of the circular cover. The gas supply... A pipe is fixedly connected to a fixing block with a vent hole. A stainless steel pipe is embedded between the annular cap and the fixing block. A nitrogen cylinder is fixedly installed at the bottom of the inner part of the protective device body. A three-way valve is embedded above the nitrogen cylinder. A second gas supply pipe is located on the right side of the three-way valve. The two sides of the three-way valve are connected to the first gas supply pipe and the gas supply pipe through conduits. When the protective gas in the nitrogen cylinder flows into the stainless steel pipe through the first gas supply pipe, the annular cap can tightly fasten to the opening of the stainless steel pipe, preventing outside air from entering the interior of the stainless steel pipe. When the protective gas is output from the vent hole, it blocks outside gas along the direction of airflow, reducing the occurrence of oxidation reaction and improving the welding quality.

[0004] The aforementioned welding protection device prevents oxidation by spraying protective gas at the welding position. However, it lacks an effective containment mechanism during the welding process, which can easily lead to the external airflow blowing away the protective gas. Furthermore, it cannot be applied to the structure of pipe fittings for automated circumferential welding, resulting in problems that affect the welding efficiency of stainless steel tee fittings. Therefore, we provide a stainless steel pipe fitting external protective welding device and its welding process. Summary of the Invention

[0005] The purpose of this invention is to provide a stainless steel pipe fitting external protective welding device and its welding process, in order to solve the problems mentioned in the background art. Existing welding protection devices prevent oxidation by spraying protective gas at the welding position, but lack an effective containment mechanism during the welding process, which can easily lead to the external airflow blowing away the protective gas. Furthermore, they cannot be applied to the structure of the pipe fitting for automated circumferential welding, thus affecting the welding efficiency of stainless steel tee fittings.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a stainless steel pipe fitting external protective welding device, comprising a welding stand, a central square groove provided at the center of the welding stand, and a pipe carrier provided inside the central square groove. Also includes: The enclosure ring frame is welded to the upper end of the welding platform. The center point of the enclosure ring frame coincides with the center point of the carrier pipe seat. Two semi-ring cover plates are provided above the enclosure ring frame, and the two semi-ring cover plates are symmetrically distributed about the center point of the enclosure ring frame. An arc-shaped groove is provided on the upper surface of the tube carrier, and a guide groove is provided inside the arc-shaped groove. Two tube clamping plates are movably arranged inside the guide groove, and two linkage rods are welded between the two tube clamping plates and the two semi-ring cover plates respectively. A front axle seat is positioned directly above the arc-shaped groove, and an I-shaped shaft is rotatably mounted inside the front axle seat. A traction link is welded to the lower end of the I-shaped shaft, and a welding torch is mounted on one end of the traction link. The outer shell of the welding torch is fixedly connected to one end of the traction link by screws. The top frame is welded to the outer wall of the front axle seat, and a drive motor is fixed to the upper end of the top frame with screws. A drive gear is welded to the output shaft of the drive motor, and a driven gear is meshed with one side of the drive gear.

[0007] Preferably, a gas supply nozzle is fixedly fitted onto one end of the welding torch, and a support base is fixedly installed on one side of the outer wall of the welding torch by screws, with a protective gas cylinder installed at the upper end of the support base.

[0008] Preferably, the bottom of the tube carrier is welded with two movable tracks, and a lead screw and slider are movably arranged inside the movable tracks. A synchronous connecting rod is welded between the lead screw and slider and the tube clamping plate.

[0009] Preferably, the movable track is internally equipped with a threaded screw, and the screw slider is slidably connected to the movable track through the threaded screw.

[0010] Preferably, a hydraulic cylinder is fixedly mounted on the inner wall of one side of the welding stand by screws, and a lifting connecting rod is welded between the piston rod of the hydraulic cylinder and the carrier tube seat.

[0011] Preferably, a gas supply pipe is provided between the protective gas cylinder and the gas supply nozzle, and a gas valve is provided at the sealed connection position between the gas supply pipe and the protective gas cylinder.

[0012] Preferably, one end of the movable track is fixed with a lead screw motor by screws, and the lead screw motor is connected to the threaded lead screw through a coupling.

[0013] Preferably, a connecting rod is welded between the top frame and the welding frame, and the top frame and the welding frame are arranged in parallel.

[0014] Preferably, a support shaft is welded between the driven gear and the I-shaped shaft, and the center of the support shaft is on the same vertical line as the center of the driven gear and the I-shaped shaft.

[0015] Preferably, the welding process of the stainless steel pipe fitting external protective welding device includes the following steps: Step 1: Place the stainless steel tee fitting to be welded into the inside of the arc groove, and make the groove opening of the guide groove support the arc surface of the stainless steel tee fitting. After the support is completed, drive the two threaded screws to rotate through the two screw motors, and make the screw sliders guide the movement along the guide groove. Step 2: During the movement of the two lead screw sliders, the semi-ring cover plates move synchronously through the linkage rod, and the pipe clamping plate moves synchronously through the synchronous connecting rod. Finally, the two lead screw sliders move into place, at which point the two semi-ring cover plates come into contact and are placed on top of the enclosure ring frame. Step 3: After the lead screw and slider have moved into position, the two clamping plates push the stainless steel tee fitting to the center of the arc-shaped groove, so that the annular weld joint of the stainless steel tee fitting is located below the welding torch. The two clamping plates then clamp and fix the stainless steel tee fitting in place. Step 4: Drive the drive motor to rotate the drive gear. The drive gear rotates simultaneously with the driven gear meshing with it, which in turn drives the support shaft and the I-shaped shaft to rotate synchronously. This causes the traction link to drive the welding torch to rotate and adjust 360 degrees around the center point of the enclosure ring frame. Step 5: The hydraulic cylinder drives the pipe carrier to move up and down inside the central square groove, so that the annular weld joint of the stainless steel tee pipe fitting is level with the welding head of the welding torch. When the welding torch rotates 360 degrees, the stainless steel tee pipe fitting is automatically welded. Step Six: During the welding process, open the valve of the protective gas cylinder and deliver the protective gas to the gas supply nozzle through the gas supply pipe. The gas supply nozzle then sprays the protective gas onto the welding position of the welding torch. The surrounding frame and two semi-circular cover plates block the external airflow. The protective gas covers the welding position to reduce oxidation reaction.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention provides an integrated device that includes a physical barrier and automatic circumferential welding functions. The core of the device is a welding platform with a pipe carrier for placing and raising / lowering pipe fittings, a surrounding ring frame that encloses the welding position, and two closable semi-circular cover plates, together forming a sealed or semi-sealed gas-protected space. Furthermore, a motor-gear transmission system drives the welding torch assembly to rotate 360 ​​degrees around the center of the surrounding ring frame, achieving one-time, uniform, automated circumferential welding. A linkage mechanism ensures that the closing of the semi-circular cover plates is synchronized with the alignment and clamping of the pipe fittings.

[0017] The screw motor drives the threaded screw, which, through the screw slider, linkage rod, and synchronous connecting rod, synchronously controls the closing of the semi-ring cover plate and the centering and clamping action of the pipe clamping plate. The linkage between the two on the sliding track ensures that the pipe is automatically and accurately fixed at the welding center. During welding, the drive motor drives the support shaft and the I-shaped shaft through the driving gear and the driven gear, so that the welding torch and the protective gas cylinder below are welded around the pipe in a ring. The hydraulic cylinder controls the lifting and lowering of the pipe carrier to achieve the relative height matching between the welding torch and the weld. Attached Figure Description

[0018] Figure 1 This is a front view of the stainless steel tee fitting external protective welding device of the present invention; Figure 2 This is a top view of the stainless steel tee fitting external protective welding device of the present invention; Figure 3 This is a top view of the stainless steel tee fitting external protective welding device of the present invention; Figure 4 This is a side view of the structure of the stainless steel tee pipe fitting external protective welding device of the present invention; Figure 5 This is a cross-sectional view of the stainless steel tee fitting external protective welding device of the present invention; Figure 6 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle; In the diagram: 1. Welding stand; 2. Enclosure frame; 3. Top frame; 4. Erection link; 5. Drive motor; 6. Front axle seat; 7. Drive gear; 8. Driven gear; 9. Traction link; 10. Support seat; 11. Welding torch; 12. Protective gas cylinder; 13. Gas supply pipe; 14. Semi-ring cover plate; 15. Central square groove; 16. Pipe support seat; 17. Arc groove; 18. Guide groove; 19. Pipe clamping plate; 20. Linkage rod; 21. Hydraulic cylinder; 22. Lifting link; 23. Movable track; 24. Lead screw motor; 25. Gas supply nozzle; 26. I-shaped shaft; 27. Support shaft; 28. Threaded lead screw; 29. ​​Lead screw slider; 30. Synchronous link. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1

[0021] Please see Figure 1-6 An embodiment of the present invention provides a stainless steel pipe fitting external protective welding device, comprising a welding stand 1, a central square groove 15 disposed at the center of the welding stand 1, and a pipe carrier 16 disposed inside the central square groove 15; further comprising: a retaining ring frame 2, which is welded and disposed at the upper end of the welding stand 1, the center point of the retaining ring frame 2 coincides with the center point of the pipe carrier 16, and two semi-ring cover plates 14 are disposed above the retaining ring frame 2, the two semi-ring cover plates 14 being symmetrically distributed about the center point of the retaining ring frame 2; an arc-shaped groove 17, which is disposed on the upper surface of the pipe carrier 16, and a guide groove 18 is disposed inside the arc-shaped groove 17, the guide groove 18 being movable inside. There are two pipe clamping plates 19, and two linkage rods 20 are welded between the two pipe clamping plates 19 and the two semi-ring cover plates 14 respectively; a front shaft seat 6 is set directly above the arc groove 17, and an I-shaped shaft 26 is rotatably installed inside the front shaft seat 6. A traction link 9 is welded to the lower end of the I-shaped shaft 26, and a welding gun 11 is installed at one end of the traction link 9. The outer shell of the welding gun 11 is fixedly connected to one end of the traction link 9 by screws; a top frame 3 is welded to the outer wall of the front shaft seat 6, and a drive motor 5 is fixedly installed at the upper end of the top frame 3 by screws. A drive gear 7 is welded to the output shaft of the drive motor 5, and a driven gear 8 is meshed on one side of the drive gear 7.

[0022] Please see Figure 5A gas supply nozzle 25 is fixedly fitted onto one end of the welding torch 11. A support seat 10 is fixed to one side of the outer wall of the welding torch 11 by screws. A protective gas cylinder 12 is installed at the upper end of the support seat 10. The gas supply nozzle 25 serves to inject protective gas into the welding position during the welding process. Please refer to [link / reference]. Figure 2 and Figure 6 Two movable tracks 23 are welded to the bottom of the tube carrier 16. A lead screw slider 29 is movably mounted inside each movable track 23. A synchronous connecting rod 30 is welded between the lead screw slider 29 and the tube clamping plate 19. The movable tracks 23 serve to support the threaded lead screw 28 and assist the lead screw slider 29 in its sliding movement. Please refer to [link / reference]. Figure 6 The movable track 23 is internally equipped with a threaded screw 28 for rotation. The screw-slider 29 is slidably connected to the movable track 23 via the threaded screw 28. The threaded screw 28 drives the screw-slider 29 in a coordinated manner. (See also...) Figure 2 A hydraulic cylinder 21 is fixed to the inner wall of one side of the welding stand 1 by screws. A lifting connecting rod 22 is welded between the piston rod of the hydraulic cylinder 21 and the tube carrier 16. The hydraulic cylinder 21 drives the tube carrier 16 to move up and down for adjustment. Please refer to [link to relevant documentation]. Figure 1 and Figure 4 A gas supply pipe 13 is provided to connect the protective gas cylinder 12 and the gas supply nozzle 25. A gas valve is provided at the sealed connection point between the gas supply pipe 13 and the protective gas cylinder 12. The gas supply pipe 13 serves to deliver the protective gas from the protective gas cylinder 12 to the gas supply nozzle 25. Please refer to [link / reference]. Figure 2 and Figure 6 One end of the movable track 23 is fixed with a lead screw motor 24 by screws. The lead screw motor 24 is connected to the threaded lead screw 28 via a coupling. The lead screw motor 24 drives the threaded lead screw 28 to rotate. Please refer to [link / reference]. Figure 1 A connecting rod 4 is welded between the top frame 3 and the welding platform 1. The top frame 3 and the welding platform 1 are arranged parallel to each other. The connecting rod 4 serves to support and connect the top frame 3 and the welding platform 1. Please refer to [link / reference]. Figure 5 A support shaft 27 is welded between the driven gear 8 and the I-shaped shaft 26. The center point of the support shaft 27 is on the same vertical line as the center point of the driven gear 8 and the I-shaped shaft 26. The support shaft 27 serves to drive and connect the driven gear 8 and the I-shaped shaft 26.

[0023] Example 2

[0024] Please see Figure 1-6 In conjunction with Embodiment 1, this embodiment discloses a welding process for a stainless steel pipe fitting external protective welding device, including the following steps: Step 1: Place the stainless steel tee fitting to be welded into the inside of the arc groove 17, and make the groove opening of the guide groove 18 support the arc surface of the stainless steel tee fitting. After the support is completed, the two lead screw motors 24 drive the two threaded lead screws 28 to rotate, and make the lead screw slider 29 guide the movement along the guide groove 18. Step 2: During the movement of the two lead screw sliders 29, the semi-ring cover plate 14 is driven to move synchronously through the linkage rod 20, and the pipe clamping plate 19 is driven to move synchronously through the synchronous connecting rod 30. Finally, the two lead screw sliders 29 move into place, and the two semi-ring cover plates 14 abut against each other and are placed on top of the enclosure ring frame 2. Step 3: After the lead screw slider 29 moves into position, the two clamping plates 19 push the stainless steel tee fitting to the center of the arc groove 17, so that the annular weld joint of the stainless steel tee fitting is located below the welding torch 11, and the stainless steel tee fitting is clamped and fixed by the two clamping plates 19. Step 4: Drive motor 5 drives drive gear 7 to rotate. Drive gear 7 rotates simultaneously with driven gear 8, which in turn drives support shaft 27 and I-shaped shaft 26 to rotate synchronously. This causes traction link 9 to drive welding torch 11 to rotate and adjust 360 degrees with the center point of enclosure ring 2 as the reference. Step 5: The hydraulic cylinder 21 drives the pipe carrier 16 to move up and down inside the central square groove 15, so that the annular weld position of the stainless steel tee pipe fitting is level with the welding head of the welding torch 11. When the welding torch rotates 360 degrees, the stainless steel tee pipe fitting is automatically welded. Step Six: During the welding process, open the valve of the protective gas cylinder 12 and deliver the protective gas to the gas supply nozzle 25 through the gas supply pipe 13. The gas supply nozzle 25 then sprays the protective gas onto the welding position of the welding torch 11. The enclosure frame 2 and the two semi-ring cover plates 14 block the external airflow. The protective gas is used to cover the welding position and reduce oxidation reaction.

[0025] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A stainless steel pipe fitting external protective welding device, comprising a welding stand (1), a central square groove (15) is provided at the center of the welding stand (1), and a pipe carrier (16) is provided inside the central square groove (15). Its features are: Also includes: The enclosure ring frame (2) is welded to the upper end of the welding stand (1). The center point of the enclosure ring frame (2) coincides with the center point of the carrier pipe seat (16). Two semi-ring cover plates (14) are provided above the enclosure ring frame (2). The two semi-ring cover plates (14) are symmetrically distributed about the center point of the enclosure ring frame (2). An arc-shaped groove (17) is provided on the upper surface of the tube carrier (16), and a guide groove (18) is provided inside the arc-shaped groove (17). Two tube clamping plates (19) are movably arranged inside the guide groove (18), and two linkage rods (20) are welded between the two tube clamping plates (19) and the two semi-ring cover plates (14). A front axle seat (6) is located directly above the arc groove (17), and an I-shaped shaft (26) is rotatably mounted inside the front axle seat (6). A traction link (9) is welded to the lower end of the I-shaped shaft (26), and a welding gun (11) is mounted on one end of the traction link (9). The outer shell of the welding gun (11) is fixedly connected to one end of the traction link (9) by screws. The top frame (3) is welded to the outer wall of the front axle seat (6), and the upper end of the top frame (3) is fixed with a drive motor (5) by screws. The output shaft of the drive motor (5) is welded with a drive gear (7), and a driven gear (8) is meshed and driven on one side of the drive gear (7).

2. The stainless steel pipe fitting external protective welding device according to claim 1, characterized in that: A gas supply nozzle (25) is fixedly fitted onto one end of the welding torch (11), and a support seat (10) is fixedly fitted onto one side of the outer wall of the welding torch (11) by screws. A protective gas cylinder (12) is installed at the upper end of the support seat (10).

3. The stainless steel pipe fitting external protective welding device according to claim 2, characterized in that: The bottom of the tube carrier (16) is welded with two movable tracks (23), and a screw slider (29) is movably arranged inside the movable track (23). A synchronous connecting rod (30) is welded between the screw slider (29) and the tube clamping plate (19).

4. The stainless steel pipe fitting external protective welding device according to claim 3, characterized in that: The movable track (23) is internally equipped with a threaded screw (28), and the screw slider (29) is slidably connected to the movable track (23) through the threaded screw (28).

5. The stainless steel pipe fitting external protective welding device according to claim 4, characterized in that: A hydraulic cylinder (21) is fixedly installed on the inner wall of one side of the welding stand (1) by screws. A lifting link (22) is welded between the piston rod of the hydraulic cylinder (21) and the carrier tube seat (16).

6. The stainless steel pipe fitting external protective welding device according to claim 5, characterized in that: A gas supply pipe (13) is provided between the protective gas cylinder (12) and the gas supply nozzle (25), and a gas valve is provided at the sealed connection position between the gas supply pipe (13) and the protective gas cylinder (12).

7. The stainless steel pipe fitting external protective welding device according to claim 6, characterized in that: One end of the movable track (23) is fixed with a lead screw motor (24) by screws, and the lead screw motor (24) is connected to the threaded lead screw (28) through a coupling.

8. The stainless steel pipe fitting external protective welding device according to claim 7, characterized in that: A mounting rod (4) is welded between the top frame (3) and the welding frame (1), and the top frame (3) and the welding frame (1) are arranged in parallel.

9. The stainless steel pipe fitting external protective welding device according to claim 8, characterized in that: A support shaft (27) is welded between the driven gear (8) and the I-shaped shaft (26). The center of the support shaft (27) is on the same vertical line as the center of the driven gear (8) and the I-shaped shaft (26).

10. The welding process of the stainless steel pipe fitting external protective welding device according to claim 9, characterized in that: Includes the following steps: Step 1: Place the stainless steel tee fitting to be welded into the inside of the arc groove (17), and make the groove opening of the guide groove (18) support the arc surface of the stainless steel tee fitting. After the support is completed, drive the two threaded screws (28) to rotate through the two screw motors (24), and make the screw slider (29) guide the movement along the guide groove (18). Step 2: During the movement of the two lead screw sliders (29), the semi-ring cover plate (14) is driven to move synchronously through the linkage rod (20), and the pipe clamping plate (19) is driven to move synchronously through the synchronous connecting rod (30). Finally, the two lead screw sliders (29) move into place, and at this time the two semi-ring cover plates (14) abut against each other and are placed on top of the enclosure ring frame (2). Step 3: After the lead screw slider (29) moves into position, the two clamping plates (19) push the stainless steel tee fitting to the center of the arc groove (17), so that the annular weld joint of the stainless steel tee fitting is located below the welding torch (11), and the stainless steel tee fitting is clamped and fixed by the two clamping plates (19). Step 4: Drive the drive motor (5) to drive the drive gear (7) to rotate. When the drive gear (7) rotates, it drives the driven gear (8) that meshes with it to rotate synchronously, which in turn drives the support shaft (27) and the I-shaped shaft (26) to rotate synchronously, so that the traction link (9) drives the welding torch (11) to rotate and adjust 360 degrees with the center point of the enclosure ring frame (2) as the reference. Step 5: The hydraulic cylinder (21) drives the pipe carrier (16) to move up and down inside the central square groove (15), so that the annular weld position of the stainless steel tee pipe fitting reaches the position of the welding head of the welding gun (11). When the welding gun rotates 360 degrees, the stainless steel tee pipe fitting is automatically welded. Step 6: During the welding process, open the gas valve of the protective gas cylinder (12) and deliver the protective gas to the gas supply nozzle (25) through the gas supply pipe (13). The gas supply nozzle (25) will spray the protective gas to the welding position of the welding torch (11). The surrounding frame (2) and the two semi-ring cover plates (14) will block the external airflow.

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