Gas guide groove for welding steel pipe

Abstract

The air guide groove comprises a square groove body, an opening is formed in the upper portion of the groove body, an air guide pipe penetrates through the groove body and is fixedly connected with the groove body, an air inlet of the air guide pipe is located outside one end of the groove body, and a plurality of air holes are formed in the outer wall of the part, located in the groove body, of the air guide pipe. The end, where the air inlet of the air guide pipe is located, of the groove body is fixedly connected with a connecting column, a moving mechanism is further arranged, and the groove body is connected to the moving mechanism through the connecting column. The gas guide groove is used for blocking the connecting seam in the steel pipe from the interior of the steel pipe, then argon is introduced into the gas guide groove to exhaust oxygen, nitrogen and the like in the gas guide groove, the situation that when the steel pipe is welded, molten metal reacts with the gas, and the welding quality is reduced is prevented, meanwhile, only the gas in the gas guide groove needs to be exhausted, and the gas in the whole steel pipe does not need to be exhausted. And the use amount of argon is reduced, and the cost is saved.

Description

Technical Field

[0001] This utility model relates to the field of pipeline welding technology, and in particular to a gas guide groove for welding steel pipes. Background Technology

[0002] When manufacturing steel pipes, steel plates are bent to form a closed loop, and then welded together using an electric welding machine to create the pipe. During the welding of the joint between the two ends of the steel plates, argon gas is introduced into the space created by bending the plates. This reduces oxygen and nitrogen in the air during welding, preventing these gases from reacting with the molten metal, thus reducing oxidation and contamination of the weld and minimizing the loss of alloying elements. The protective effect of argon gas also reduces the loss of alloying elements, ensuring the quality of the weld joint and improving overall weld quality. Furthermore, the welding process under argon protection is more stable, resulting in higher weld quality, reduced spatter and deformation, and increased production efficiency.

[0003] Because the steel pipes produced are relatively large, the concentration of argon gas introduced into them is relatively low, which affects the welding effect. In order to increase the concentration of argon gas inside the steel pipe, a large amount of argon gas must be introduced, which increases the production cost. Utility Model Content

[0004] The purpose of this invention is to provide a gas guide groove for welding steel pipes, which has the advantages of reducing the amount of argon gas used and lowering production costs.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A gas guide groove for welding steel pipes includes a square groove body with an opening at the top. A gas guide pipe passes through the groove body and is fixedly connected to the groove body. The gas inlet of the gas guide pipe is located outside one end of the groove body. Multiple air holes are formed on the outer wall of the portion of the gas guide pipe inside the groove body. A connecting column is fixedly connected to the end of the groove body where the gas inlet of the gas guide pipe is located. A moving mechanism is also provided, and the groove body is connected to the moving mechanism through the connecting column.

[0007] Using the above technical solution, after the steel plates are joined end to end to form a tube, the joint of the steel pipe is aligned with the gas guide groove. The moving mechanism drives the gas guide groove into the inside of the steel pipe, and the groove body contacts the inner wall of the steel pipe. The groove body blocks the joint on the steel pipe from the inside. The electric welding machine welds the joint on the outside of the steel pipe. At the same time, argon gas is introduced into the gas guide pipe. The argon gas overflows from the gas outlet of the gas guide pipe into the gas guide groove, and the air in the gas guide groove is discharged from the joint of the steel pipe. Then the argon gas overflows into the joint, avoiding the reaction of oxygen, nitrogen and other gases in the air with the molten metal during welding, which would affect the welding quality. By blocking the joint with the gas guide groove, only the air in the gas guide groove needs to be discharged, not the air in the entire steel pipe. This reduces the amount of oxygen and nitrogen that the steel pipe comes into contact with, thus eliminating the need for a large amount of argon gas, saving materials and reducing production costs.

[0008] Preferably, the moving mechanism includes a connecting plate, the lower end of the connecting column is fixedly connected to the connecting plate, two support rods are hinged to both sides of the lower surface of the connecting plate, the support rods on both sides of the connecting plate are symmetrical to each other, a rotating mechanism is provided on the connecting plate, and a mounting plate is also included. The movable end of each support rod is hinged to the surface of the mounting plate, and a driving mechanism is provided between the mounting plate and the two support rods located on different sides of the mounting plate.

[0009] Using the above technical solution, the driving mechanism drives the two opposing support rods connected to it to rotate. The two support rods drive the other two support rods to rotate through the connecting plate. The connecting plate rotates under the action of the rotating support rods, and the angle remains unchanged, always in a horizontal state. The rotating connecting plate drives the air guide groove into the steel pipe and closes to the connecting seam. Then, the angle of the air guide groove is adjusted by the rotating mechanism so that it contacts the inner wall of the steel pipe and blocks the connecting seam.

[0010] Preferably, the driving mechanism is a cylinder, and a connecting rod is fixedly connected between two opposing support rods on different sides of the connecting plate. The cylinder is hinged to the mounting plate, and the cylinder output shaft is hinged to the connecting rod.

[0011] Using the above technical solution, the cylinder output shaft extends and pushes the support rod connected to it to rotate through the connecting rod, thereby driving the connecting plate to rotate, and the connecting plate drives the air guide groove to rotate.

[0012] Preferably, a cover plate is slidably connected to the upper opening of the tank, and a fixing member is provided between the cover plate and the tank.

[0013] Using the above technical solution, the size of the tank opening is adjusted by moving the cover plate according to the length of different steel pipes, thereby increasing the sealing of the tank. When the steel pipe is short, the cover plate is moved to reduce the opening of the cover plate, preventing the tank from blocking the joint and leaving an excess opening. This would cause the argon gas to escape from the excess opening, reducing the concentration of argon gas and affecting the quality of the welding.

[0014] Preferably, the upper part of the trough is provided with a sliding groove, the cover plate passes through the sliding groove, the cover plate is slidably connected to the trough, the fixing member is a bolt, the bolt passes vertically through the top of the sliding groove and enters its interior, the bolt is threadedly connected to the trough, and the end of the bolt contacts the cover plate.

[0015] Using the above technical solution, after moving the cover plate to expose an opening of appropriate size in the tank, tighten the bolts to make it press against the cover plate, so that the tank is kept in the state of having the opening of the specified size.

[0016] Preferably, the rotating mechanism is a lead screw, which is horizontally rotatably connected to the bottom of the connecting plate. The lead screw slider is fixedly connected to a movable rod, and two other support rods located on opposite sides of the connecting plate are respectively hinged to the two ends of the movable rod.

[0017] Using the above technical solution, after the cylinder output shaft extends and pushes the connecting plate and its upper air guide groove close to the connecting seam on the steel pipe, the cylinder stops outputting. The cylinder and the support rod connected to it form a triangular mechanism, so that the two remain stationary. Rotating the lead screw causes its slider to move the moving rod relative to the connecting plate. The moving rod causes the support rod hinged to it to rotate, thereby causing the connecting plate to rotate relative to the support rod connected to the cylinder. The connecting plate causes the air guide groove to rotate, adjusting the angle of the air guide groove to block the connecting seam on the steel pipe. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of the embodiment;

[0019] Figure 2 This is a side view of an embodiment;

[0020] Figure 3 This is a top view of an embodiment;

[0021] Figure 4 This is a rear view of an embodiment;

[0022] Figure 5 This is a schematic diagram of the overall structure of the tank.

[0023] Figure 6 This is a schematic diagram of the overall moving mechanism;

[0024] Figure 7 This is a schematic diagram of welding steel pipes.

[0025] Reference numerals in the attached drawings: 1. Tank; 2. Air guide pipe; 3. Connecting column; 4. Connecting plate; 5. Support rod; 6. Mounting plate; 7. Connecting rod; 8. Cylinder; 9. Cover plate; 10. Bolt; 11. Screw; 12. Moving rod. Detailed Implementation

[0026] The following description is merely a preferred embodiment of this utility model, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of this utility model should be considered within the protection scope of this utility model. It should also be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

[0027] See Figures 1 to 6 A gas guide groove for welding steel pipes includes a connecting plate 4. A horizontal lead screw 11 is rotatably connected to the bottom of the connecting plate 4. A sliding rod 12 is fixedly connected to the lead screw 11. Support rods 5 are hinged to both ends of the sliding rod 12. Two support rods 5 are hinged to the bottom of the connecting plate 4, corresponding to the sliding rods 12 at both ends, and located on the same side of the connecting plate 4. A connecting rod 7 is fixedly connected between the two support rods 5 on the connecting plate 4. The system also includes a mounting plate 6, with the movable end of each support rod 5 hinged to the surface of the mounting plate 6. A cylinder 8 is hinged to the surface of the mounting plate 6, and the output shaft of the cylinder 8 is hinged to the connecting rod 7. A gas guide groove is fixedly connected to the upper part of the connecting plate 4. The gas guide groove includes a square groove 1 with an opening at the top. A gas guide pipe 2 passes through the groove 1 and is fixedly connected to the groove 1. The air inlet of the gas guide pipe 2 is located outside one end of the groove 1. Multiple air holes are formed on the outer wall of the portion of the gas guide pipe 2 inside the groove 1. A connecting post 3 is fixedly connected to the end of the groove 1 where the air inlet of the gas guide pipe 2 is located. The connecting post 3 is fixedly connected to the connecting plate 4. A sliding groove is formed at the upper part of the groove 1. A cover plate 9 passes through the sliding groove and is slidably connected to the groove 1. The fastener is a bolt 10. A vertical bolt 10 is threaded through the top of the sliding groove and inserted into the sliding groove. The end of the bolt 10 contacts the cover plate 9.

[0028] Working Principle: After the steel plates are joined end to end to form a tube, the joint of the steel pipe is aligned with the air guide groove. The output shaft of cylinder 8 extends and pushes the support rod 5, which is hinged to the connecting plate 4, to rotate via the connecting rod 7. The two support rods 5, through the connecting plate 4, drive the support rod 5 connected to the moving rod 12 to rotate. The connecting plate 4 rotates under the action of the rotating support rods 5, and the angle remains unchanged, always remaining in a horizontal state. The rotating connecting plate 4 drives the air guide groove into the steel pipe, close to the joint. Then, the screw 11 is rotated, and its slider drives the moving rod 12 to move relative to the connecting plate 4. The moving rod 12 drives the support rod 5, which is hinged to it, to rotate, thereby driving the connecting plate 4 to rotate relative to the support rod 5. The connecting plate 4 drives the air guide groove to rotate, adjusting the angle of the air guide groove so that the groove 1 contacts the inner wall of the steel pipe, blocking the joint from the inside of the steel pipe. The welding machine welds the joint seam on the outside of the steel pipe while simultaneously introducing argon gas into the gas guide pipe 2. The argon gas overflows from the outlet of the gas guide pipe 2 into the gas guide groove, venting the air in the gas guide groove through the joint seam of the steel pipe. The argon gas then overflows into the joint seam, preventing oxygen and nitrogen in the air from reacting with the molten metal during welding and affecting the weld quality. By blocking the joint seam with the gas guide groove, only the air in the gas guide groove needs to be vented, rather than the air inside the entire steel pipe. This reduces the amount of oxygen and nitrogen the steel pipe comes into contact with, thus saving materials and reducing production costs by avoiding the use of large amounts of argon gas.

Claims

1. A gas guide groove for welding steel pipes, characterized in that, It includes a square trough (1), with an opening at the top of the trough (1). A duct (2) passes through the trough (1) and is fixedly connected to the trough (1). The air inlet of the duct (2) is located outside one end of the trough (1). The outer wall of the part of the duct (2) inside the trough (1) has multiple air holes. A connecting column (3) is fixedly connected to the end of the trough (1) where the air inlet of the duct (2) is located. A moving mechanism is also provided. The trough (1) is connected to the moving mechanism through the connecting column (3).

2. The air guide groove for welding steel pipes according to claim 1, characterized in that, The moving mechanism includes a connecting plate (4), the lower end of the connecting column (3) is fixedly connected to the connecting plate (4), two support rods (5) are respectively connected to the two sides of the lower surface of the connecting plate (4), the support rods (5) on both sides of the connecting plate (4) are symmetrical to each other, a rotating mechanism is provided on the connecting plate (4), and a mounting plate (6) is also included. The movable end of each support rod (5) is hinged to the surface of the mounting plate (6), and a driving mechanism is provided between the support rod (5) and the mounting plate (6).

3. The air guide groove for welding steel pipes according to claim 2, characterized in that, The driving mechanism is a cylinder (8), which is located on different sides of the connecting plate (4). A connecting rod (7) is fixedly connected between two opposing support rods (5). The cylinder (8) is hinged to the mounting plate (6), and the output shaft of the cylinder (8) is hinged to the connecting rod (7).

4. The air guide groove for welding steel pipes according to claim 1, characterized in that, A cover plate (9) is slidably connected to the upper opening of the trough (1), and a fixing member is provided between the cover plate (9) and the trough (1).

5. A gas guide groove for welding steel pipes according to claim 4, characterized in that, The upper part of the groove (1) is provided with a sliding groove, the cover plate (9) passes through the sliding groove, the cover plate (9) is slidably connected to the groove (1), the fixing member is a bolt (10), the bolt (10) passes vertically through the top of the sliding groove and enters its interior, the bolt (10) is threadedly connected to the groove (1), and the end of the bolt (10) contacts the cover plate (9).

6. A gas guide groove for welding steel pipes according to claim 2, characterized in that, The rotating mechanism is a lead screw (11), which is horizontally rotatably connected to the bottom of the connecting plate (4). The lead screw (11) is fixedly connected to a movable rod (12) by a slider. Two other support rods (5) located on different sides of the connecting plate (4) are respectively hinged to the two ends of the movable rod (12).

Images