An explosion-proof gas protection device for laser welding of a hydrogen fuel tank

Abstract

The utility model discloses an explosion -proof gas protection device of hydrogen fuel tank laser welding, including the welding head body, the bottom fixed mounting of welding head body has the light -passing circle, the side of light -passing circle is provided with the gas pipe joint, the bottom of light -passing circle is provided with the air jet mouth, the middle part sealed rotation of light -passing circle is connected with the rotating circle, the outer periphery of light -passing circle fixed mounting has the circular slide rail in the rotating circle upside and downside, the circular slide rail top fixed mounting of upper portion has the regulating motor, the opposite side sliding connection of two circular slide rails has the moving block, the top fixed mounting of upper portion moving block has the gear ring, the output of regulating motor fixed mounting has the gear. Can form the better protection gas atmosphere in the weld pool area and the uncooled area after the solidification of molten pool, forms the effective gas protection to the whole welding process of laser welding weld, thereby has improved the quality of weld.

Description

Technical Field

[0001] This utility model relates to the field of laser welding technology, specifically to an explosion-proof gas protection device for laser welding of hydrogen fuel tanks. Background Technology

[0002] Hydrogen fuel refers to liquid hydrogen fuel. It is a colorless gas. Burning one gram of hydrogen releases 142 kilojoules of heat, three times the calorific value of gasoline. Its combustion product is water, with no ash or exhaust gas, thus it does not pollute the environment. Hydrogen fuel storage requires hydrogen fuel tanks, and the production of these tanks requires laser welding. During laser welding, the surface of the workpiece absorbs a large amount of heat, rapidly melting and further vaporizing, forming a vapor cloud above the workpiece. This vapor cloud absorbs heat and ionizes in the incident path of the laser beam, generating plasma. Once formed, this photo-induced plasma shields the laser beam through inverse bremsstrahlung absorption and refraction, affecting the coupling of light energy with the workpiece and leading to significant light energy loss. This, in turn, affects the weld penetration, porosity, and weld microstructure.

[0003] Traditional laser welding gas shielding devices come in two types: coaxial shielding gas devices and off-axis side-blowing gas shielding devices. Each type has its advantages and disadvantages: 1) Coaxial shielding gas devices can provide gas shielding for welds with various trajectory lines, but due to their small effective protection area, they can only provide a certain degree of gas protection for the current molten pool, resulting in poor protection; 2) Off-axis side-blowing gas shielding devices can provide gas shielding for welds with straight or similar trajectory lines. As long as the gas outlets of the off-axis are long enough and wide enough to cover the weld, they can effectively protect the weld. However, they are not entirely applicable to some special weld trajectories, such as welds with closed patterns. Because the welding head cannot rotate during welding, the gas shielding device cannot always be positioned behind the molten pool. If the gas shielding device cannot be positioned behind the molten pool, the weld cannot be effectively protected. Therefore, off-axis side-blowing gas shielding devices have significant limitations in application.

[0004] Therefore, we propose an explosion-proof gas protection device for laser welding of hydrogen fuel tanks. Utility Model Content

[0005] The purpose of this invention is to provide an explosion-proof gas protection device for laser welding of hydrogen fuel tanks, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an explosion-proof gas protection device for laser welding of hydrogen fuel tanks, comprising a welding head body, a light-transmitting ring fixedly installed at the bottom of the welding head body, a gas pipe connector provided at the top of the side of the light-transmitting ring, a gas nozzle provided at the bottom of the light-transmitting ring, a rotating ring sealed and rotatably connected to the middle of the light-transmitting ring, circular slide rails located on the upper and lower sides of the rotating ring fixedly installed on the outer circumferential surface of the light-transmitting ring, an adjusting motor fixedly installed at the top of the upper circular slide rail, a moving block slidably connected to the opposing surfaces of the two circular slide rails, a gear ring fixedly installed at the top of the upper moving block, a gear fixedly installed at the output end of the adjusting motor, the gear meshing with the gear ring, a connecting frame fixedly installed on the opposing surface of the moving block, the middle of the connecting frame fixedly installed to the outer circumferential surface of the rotating ring, an auxiliary gas pipe fixedly installed on the outer circumferential surface of the rotating ring, and an auxiliary gas nozzle fixedly installed at the end of the auxiliary gas pipe.

[0007] Optionally, the two circular slide rails are symmetrically arranged on the upper and lower sides of the rotating ring, and the two circular slide rails are slidably connected with the same number of moving blocks, and the auxiliary air tube is located between two adjacent connecting frames.

[0008] Optionally, the light-transmitting ring, the air nozzle, and the rotating ring are arranged coaxially, and the inner diameter of the air nozzle is smaller than the inner diameter of the light-transmitting ring.

[0009] Optionally, the diameter of the rotating ring is the same as the diameter of the light-transmitting ring, and a connection hole communicating with the auxiliary air pipe is provided in the middle of the rotating ring.

[0010] Optionally, the interior of the light-transmitting ring is provided with a connecting block whose width is smaller than the diameter of the connecting hole, and the two parts of the light-transmitting ring located on the upper and lower sides of the rotating ring are integrally connected by the connecting block.

[0011] Optionally, the inner diameter of the toothed ring is larger than the diameter of the circular slide rail, and the top of the toothed ring is higher than the top of the circular slide rail.

[0012] Optionally, sealing rings are fixedly installed on the upper and lower sides of the rotating ring through grooves, and the inside of the light-transmitting ring is tightly abutted against the sealing rings.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The explosion-proof gas protection device for laser welding of hydrogen fuel tanks uses an auxiliary gas pipe. When the welding head is laser welded, the protective gas is delivered to the inside of the optical aperture through the gas pipe connector and then ejected through the nozzle to form a gas protection on the surface of the welded object. At the same time, some of the protective gas enters the auxiliary gas pipe through the connection hole and is then blown from the side of the weld pool through the auxiliary gas nozzle to further enhance the protection performance.

[0015] The explosion-proof gas protection device for laser welding of hydrogen fuel tanks, by setting up a rotating ring, when welding a weld with a special trajectory, as the welding head moves, the adjusting motor drives the rotating ring through gears and a gear ring to rotate, thereby adjusting the ejection direction of the auxiliary gas pipe and auxiliary gas nozzle. This can form a better protective gas atmosphere in the weld pool area and the uncooled area after the weld pool solidifies, providing effective gas protection for the entire welding process of the laser weld, thereby improving the quality of the weld. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an explosion-proof gas protection device for laser welding of hydrogen fuel tanks according to the present invention.

[0017] Figure 2 This is a schematic diagram of the optical aperture of an explosion-proof gas protection device for laser welding of hydrogen fuel tanks according to this utility model;

[0018] Figure 3 This is a schematic diagram of the circular slide rail of an explosion-proof gas protection device for laser welding of hydrogen fuel tanks according to this utility model.

[0019] Figure 4 This is a schematic diagram of the rotating ring of an explosion-proof gas protection device for laser welding of hydrogen fuel tanks according to this utility model.

[0020] In the diagram: 1. Welding head body; 2. Through-hole; 3. Air pipe connector; 4. Air nozzle; 5. Circular slide rail; 6. Adjustment motor; 7. Moving block; 8. Connecting frame; 9. Gear ring; 10. Gear; 11. Rotating ring; 12. Auxiliary air pipe; 13. Connecting hole; 14. Auxiliary air nozzle. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1 to 4This utility model provides an explosion-proof gas protection device for laser welding of hydrogen fuel tanks, including a welding head body 1. A light-transmitting ring 2 is fixedly installed at the bottom of the welding head body 1. A gas pipe connector 3 is provided on the top of the side of the light-transmitting ring 2. An air nozzle 4 is provided at the bottom of the light-transmitting ring 2. A rotating ring 11 is rotatably connected to the middle of the light-transmitting ring 2. Circular slide rails 5 located on the upper and lower sides of the rotating ring 11 are fixedly installed on the outer circumference of the light-transmitting ring 2. An adjusting motor 6 is fixedly installed on the top of the upper circular slide rail 5. A moving block 7 is slidably connected to the opposite surfaces of the two circular slide rails 5. A gear ring 9 is fixedly installed on the top of the upper moving block 7. A gear 10 is fixedly installed at the output end of the adjusting motor 6. The gear 10 meshes with the gear ring 9. A connecting frame 8 is fixedly installed on the opposite side of the rotating ring 11. The middle part of the connecting frame 8 is fixedly installed on the outer circumference of the rotating ring 11. An auxiliary gas pipe 12 is fixedly installed on the outer circumference of the rotating ring 11. An auxiliary gas nozzle 14 is fixedly installed at the end of the auxiliary gas pipe 12. By setting the rotating ring 11, when welding a weld with a special trajectory, as the welding head body 1 moves, the adjusting motor 6 drives the rotating ring 11 to rotate through the gear 10 and the gear ring 9, thereby adjusting the spray direction of the auxiliary gas pipe 12 and the auxiliary gas nozzle 14. A good protective gas atmosphere can be formed in the weld pool area and the uncooled area after the weld pool solidifies, forming an effective gas protection for the entire welding process of the laser weld, thereby improving the quality of the weld.

[0023] Two circular slide rails 5 are symmetrically arranged on the upper and lower sides of the rotating ring 11. The two circular slide rails 5 are slidably connected with the same number of moving blocks 7. The auxiliary gas pipe 12 is located between two adjacent connecting frames 8. By setting the auxiliary gas pipe 12, when the welding head body 1 is laser welded, the protective gas is delivered to the inside of the light transmission ring 2 through the gas pipe connector 3, and then sprayed out through the air nozzle 4 to form a gas protection on the surface of the welded object. At the same time, part of the protective gas enters the auxiliary gas pipe 12 through the connecting hole 13, and then blows air from the side of the weld pool through the auxiliary gas nozzle 14 to further enhance the protective performance.

[0024] The light-transmitting ring 2, the jet nozzle 4, and the rotating ring 11 are arranged on the same axis, and the inner diameter of the jet nozzle 4 is smaller than the inner diameter of the light-transmitting ring 2.

[0025] The diameter of the rotating ring 11 is the same as the diameter of the light-transmitting ring 2, and a connecting hole 13 communicating with the auxiliary air pipe 12 is provided in the middle of the rotating ring 11.

[0026] Inside the light-transmitting ring 2 is a connecting block with a width smaller than the diameter of the connecting hole 13. The two parts of the light-transmitting ring 2 located on the upper and lower sides of the rotating ring 11 are connected as a whole by the connecting block.

[0027] The inner diameter of the toothed ring 9 is larger than the diameter of the circular slide rail 5, and the top of the toothed ring 9 is higher than the top of the circular slide rail 5.

[0028] Sealing rings are fixedly installed on the upper and lower sides of the rotating ring 11 through grooves, and the inside of the light-transmitting ring 2 is tightly abutted against the sealing rings.

[0029] Working principle:

[0030] When the welding head body 1 is laser welded, the shielding gas is delivered to the inside of the optical ring 2 through the gas pipe connector 3, and then ejected through the air nozzle 4 to form a gas protection on the surface of the welded object. At the same time, part of the shielding gas enters the auxiliary gas pipe 12 through the connection hole 13, and then blows air from the side of the weld pool through the auxiliary gas nozzle 14 to further enhance the protection performance. When welding a weld with a special trajectory, as the welding head body 1 moves, the adjusting motor 6 drives the rotating ring 11 to rotate through the gear 10 and the gear ring 9, thereby adjusting the ejection direction of the auxiliary gas pipe 12 and the auxiliary gas nozzle 14, which can form a better shielding gas atmosphere in the weld pool area and the uncooled area after the weld pool solidifies.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof gas protection device for laser welding of hydrogen fuel tanks, comprising a welding head body (1), characterized in that, A light-transmitting ring (2) is fixedly installed at the bottom of the welding head body (1). A gas pipe connector (3) is provided on the top of the side of the light-transmitting ring (2). An air nozzle (4) is provided at the bottom of the light-transmitting ring (2). A rotating ring (11) is rotatably connected to the middle of the light-transmitting ring (2). Circular slide rails (5) located on the upper and lower sides of the rotating ring (11) are fixedly installed on the outer circumferential surface of the light-transmitting ring (2). An adjusting motor (6) is fixedly installed on the top of the upper circular slide rail (5). The opposing surfaces of the two circular slide rails (5) are slidably connected. A movable block (7) is connected to the top of the movable block (7), and a gear ring (9) is fixedly installed on the top of the movable block (7). A gear (10) is fixedly installed at the output end of the regulating motor (6). The gear (10) meshes with the gear ring (9). A connecting frame (8) is fixedly installed on the opposite side of the movable block (7). The middle part of the connecting frame (8) is fixedly installed on the outer circumference of the rotating ring (11). An auxiliary air pipe (12) is fixedly installed on the outer circumference of the rotating ring (11). An auxiliary air nozzle (14) is fixedly installed at the end of the auxiliary air pipe (12).

2. The explosion-proof gas protection device for laser welding of hydrogen fuel tanks according to claim 1, characterized in that, Two circular slide rails (5) are symmetrically arranged on the upper and lower sides of the rotating ring (11). The two circular slide rails (5) are slidably connected with the same number of moving blocks (7). The auxiliary air pipe (12) is located between two adjacent connecting frames (8).

3. The explosion-proof gas protection device for laser welding of hydrogen fuel tanks according to claim 1, characterized in that, The light-transmitting ring (2), the jet nozzle (4), and the rotating ring (11) are arranged on the same axis, and the inner diameter of the jet nozzle (4) is smaller than the inner diameter of the light-transmitting ring (2).

4. The explosion-proof gas protection device for laser welding of hydrogen fuel tanks according to claim 1, characterized in that, The diameter of the rotating ring (11) is the same as the diameter of the light-transmitting ring (2), and a connecting hole (13) communicating with the auxiliary air pipe (12) is provided in the middle of the rotating ring (11).

5. The explosion-proof gas protection device for laser welding of hydrogen fuel tanks according to claim 2, characterized in that, The interior of the light-transmitting ring (2) is provided with a connecting block whose width is smaller than the diameter of the connecting hole (13). The two parts of the light-transmitting ring (2) located on the upper and lower sides of the rotating ring (11) are connected as a whole by the connecting block.

6. The explosion-proof gas protection device for laser welding of hydrogen fuel tanks according to claim 1, characterized in that, The inner diameter of the toothed ring (9) is larger than the diameter of the circular slide rail (5), and the top of the toothed ring (9) is higher than the top of the circular slide rail (5).

7. The explosion-proof gas protection device for laser welding of hydrogen fuel tanks according to claim 1, characterized in that, The upper and lower sides of the rotating ring (11) are fixedly installed with sealing rings through grooves, and the inside of the light-transmitting ring (2) is tightly abutted against the sealing rings.

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