Gun-following protection device and method for laser welding

Abstract

The invention discloses a gun-following protection device and method for laser welding, the device comprises a protection shell, a guide pipe, an adapter and a fixing support, the air outlet end of the guide pipe is communicated with the protection shell, the air inlet end of the guide pipe is communicated with the air outlet end of the adapter, the guide pipe is connected with the fixing support, and one end of the fixing support is connected with a welding head. The protective gas is concentrated through the protective shell, so that the welding defects such as welding seam oxidation, embrittlement of a welding joint and a heat affected zone, welding seam cracking tendency and welding blistering are overcome, the welding efficiency is improved, the first-time inspection qualification rate of products is increased, and therefore the manufacturing cost of workpieces is reduced. And through the arrangement of the fixing support and the guide pipe, the protective shell can move along with the welding head, and the beneficial effects of being high in welding operation efficiency and the like are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of laser welding, and in particular relates to a gun protection device and method for laser welding. Background Art

[0002] Laser welding technology has many advantages over traditional welding methods. For example, laser welding technology has higher work efficiency and can effectively avoid the occurrence of tool wear and failure in traditional welding methods. Therefore, laser welding technology has been widely used in the field of material welding processing.

[0003] However, in the process of using laser to weld materials, the high temperature in the laser action area will cause the material to react with the surrounding air, affecting the processing quality of the product. At present, it is necessary to use a gas protection device to blow protective gas to the laser action area to ensure the processing quality, but the protective gas has too fast air flow speed, too high air pressure, and a small action range, so it cannot play a comprehensive protective role. Therefore, a protective device that can concentrate the protective gas at the welding point is needed.

[0004] The patent document with announcement number CN116833564A discloses a variable spot intelligent dual-drive laser and flame composite welding head, including: a flame welding head, a laser welding head is fixedly connected to the lower inner wall of the flame welding head; an adjustment mechanism, the adjustment mechanism includes an installation box, multiple transmission tubes, a power component, an adjustment component, a support component, multiple groups of moving components, two groups of transmission components and two groups of connecting components. Through the rotation and transmission of the fixed motor, the connecting block can drive the connecting plate to move on the fixed threaded rod, and the support rod can drive the rubber block to disengage from the docking ring. At the same time, through transmission, the threaded barrel can be moved on the installation threaded rod, and the protective cover can be moved, so that the flame welding head and the laser welding head can be quickly switched. At the same time, during flame welding, waste chips can be avoided from splashing. Through the cooperation of the worm gear and the worm, the fixed rod is rotated, and the transmission gear drives the fixing bolt to rotate through transmission, so that the fixing bolt is rotated into the threaded hole on the external gas transmission device, which can facilitate users to install and disassemble the welding head. However, the contact surface between the protective cover and the workpiece has no deformable soft structure, which affects its fit with the workpiece to a certain extent. At the same time, there is no gas dispersion structure, and the gas is easily concentrated in the airflow area, which easily leads to different gas concentrations at different positions in the protective cover.

[0005] The patent document with the announcement number CN216370669U discloses a laser welding gas protection device, including an upper cover body, a laser welding gun and a protective gas nozzle, the laser welding gun is fixedly sleeved with a rhombus tube, and the rhombus tube is movably sleeved with one end of the upper cover body cover bottom, a plurality of springs are arranged on one side of the outer wall of the rhombus tube, and the two ends of the plurality of springs are respectively fixed to the side wall of the rhombus tube and the upper cover body, the protective gas nozzle is fixed to one side of the upper cover body, and the nozzle of the protective gas nozzle extends into the upper cover body, a lower cover body is arranged below the upper cover body, and the openings of the upper cover body and the lower cover body are arranged facing each other, the side wall of the upper cover body is fixedly connected with a conduit, and the other end of the conduit is fixedly connected with the lower cover body, and the upper cover body is also provided with an adsorption component matching the lower cover body. The patent performs jet protection on both the upper and lower sides of the welding point during the welding process, and the upper and lower covers need to be moved synchronously to achieve the best effect, which increases the difficulty of welding operation, and the lower cover body needs to be operated by manpower, which increases the labor cost. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a gun protection device and method for laser welding.

[0007] The present invention is achieved through the following technical solutions.

[0008] The gun protection device for laser welding provided by the present invention comprises a protection shell, a conduit, an adapter and a fixed bracket, wherein the air outlet end of the conduit is connected to the protection shell, the air inlet end of the conduit is connected to the air outlet end of the adapter, the conduit and the adapter are connected to the fixed bracket, and one end of the fixed bracket is connected to the welding head.

[0009] Preferably, a protection ring is provided below the protection shell, the protection ring is connected to the bottom of the protection shell, and the protection ring is connected and fastened to the protection shell by fastening screws.

[0010] Preferably, the connection between the protection ring and the protection shell is inclined.

[0011] Preferably, a filter element partition is arranged in the protection shell, and the filter element partition divides the internal space of the protection shell into two layers. The filter element partition is connected and fastened to the protection shell by fastening screws.

[0012] Preferably, a quick-pull air connector is provided on the top of the protective shell, and the quick-pull air connector is connected and fastened to the protective shell by a fastening screw.

[0013] Preferably, an air inlet pipe is provided at the air inlet end of the adapter.

[0014] Preferably, the fixing bracket is connected to the welding head via fixing bolts.

[0015] Preferably, the conduit is a corrugated conduit.

[0016] The method for using the gun protection device for laser welding comprises the following steps:

[0017] S1: Fix the protection ring and filter element partition to the protection housing by tightening screws;

[0018] S2: Connect the catheter to the fixed bracket through the adapter, and connect the air inlet pipe to the adapter;

[0019] S3: Install a quick-pull inflatable joint on the protective shell, make threaded holes in the front and rear directions of the welding head, and then connect the protective device to the threaded holes of the welding head through fixing bolts so that the protective device moves with the laser head welding.

[0020] The beneficial effects of the present invention are:

[0021] The present invention concentrates the protective gas through the protective shell, increases the concentration of the protective gas in the welding area, solves the welding defects such as weld oxidation, embrittlement of the welding joint and the heat-affected zone, weld crack tendency, welding blistering, etc., improves the welding efficiency, and improves the first-time inspection pass rate of the product, thereby reducing the manufacturing cost of the workpiece. It also has the advantages of simple structure and convenient clamping. Through the setting of the fixed bracket and the guide tube, the protective shell can move with the welding head, and has the characteristics of high welding operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] In the figure: 1-fastening screw, 2-protective shell, 3-protective ring, 4-conduit, 5-adapter, 6-inlet pipe, 7-filter element partition, 8-fixing bracket, 9-quick-pull inflation connector, 10-fixing bolt, 11-welding head. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0025] Example:

[0026] like Figure 1 As shown, the gun protection device for laser welding includes a protection shell 2, a conduit 4, an adapter 5 and a fixed bracket 8, the air outlet end of the conduit 4 is connected to the protection shell 2, the air inlet end of the conduit 4 is connected to the air outlet end of the adapter 5, the conduit 4 and the adapter 5 are slidably connected to the fixed bracket 8, and one end of the fixed bracket 8 is connected to the welding head 11.

[0027] A protective ring 3 is arranged below the protective shell 2, and the protective ring 3 is connected to the bottom of the protective shell 2. The protective ring 3 is connected and fastened to the protective shell 2 by a fastening screw 1. The material of the protective ring 3 is rubber. The protective ring 3 is soft in texture and can fit well with the workpiece, and can prevent the shielding gas from escaping from below the protective shell 2. The protective shell 2 moves synchronously with the laser welding head 11 according to the actual welding position and angle.

[0028] 3. The gun protection device for laser welding as claimed in claim 2 is characterized in that the connection between the protection ring 3 and the protection shell 2 is inclined, which can increase the space on the side of the welding head 11 formed by the inner cavity of the protection shell 2 and the protection ring 3 to facilitate the welding operation.

[0029] A filter element partition 7 is arranged inside the protective shell 2, and the filter element partition 7 divides the internal space of the protective shell 2 into two layers. The filter element partition 7 is connected and fastened to the protective shell 2 by fastening screws 1, and the gas is evenly dispersed through the filter element partition 7 in the protective shell 2 to cover the workpiece and the weld.

[0030] A quick-pull gas connector 9 is provided on the top of the protective housing 2, and the quick-pull gas connector 9 is connected and fastened to the protective housing 2 through a fastening screw 1. During the workpiece welding process, the quick-pull gas connector 9 can be used to increase the protective gas path of the protective housing 2 according to the weld protection situation.

[0031] An air inlet pipe 6 is disposed at the air inlet end of the adapter 5 , and the protective gas is transmitted to the protective housing 2 through the air inlet pipe 6 and the corrugated conduit 4 .

[0032] The fixing bracket 8 is connected to the welding head 11 via fixing bolts 10 and has a quick disassembly and assembly function.

[0033] The conduit 4 is a corrugated conduit that can be bent or stretched to facilitate the movement of the protective shell 2.

[0034] The fixing bracket 8 is made of 2mm stainless steel plate and then fixed on the laser head of the laser welding by fixing bolts 10. The guide tube 4 is made of aluminum alloy and has the functions of supporting, fixing, connecting and conducting, and can realize multi-directional and multi-angle rotation and bending according to the welding path of the laser head.

[0035] The filter element partition 7 is made of 1mm stainless steel and is prepared by laser cutting. The filter element partition 7 is provided with a through hole with an increasing aperture from the center, and the through hole has a minimum diameter of 2mm, which can evenly disperse the protective gas on the weld to achieve weld protection.

[0036] The protective shell 2 is made of 2mm stainless steel plate by bending and welding, and threaded holes are made around it. The protective ring 3 is made of non-metallic material, which can fit well with the surface of the part to prevent the escape of protective gas and better achieve welding protection. After the protective shell 2 is prepared,

[0037] The method for using the gun protection device for laser welding comprises the following steps:

[0038] S1: Fix the protection ring 3 and the filter element partition 7 on the protection housing 2 by tightening the screws 1.

[0039] S2: Connect the conduit 4 to the fixed bracket 8 through the adapter 5, and connect the air inlet pipe 6 to the adapter 5.

[0040] S3: A quick-pull inflatable connector 9 is installed on the protective shell 2, and a protection path can be added according to the weld protection situation to better realize weld protection; two M6 threaded holes are made in the front and rear directions of the moving direction of the welding head 11, and then the protective device is connected to the threaded hole of the welding head 11 through the fixing bolts 10, so that the protective device moves with the laser head welding to realize weld protection.

Claims

1. A gun protection device for laser welding, characterized in that: The invention comprises a protective shell (2), a conduit (4), an adapter (5) and a fixed bracket (8); the air outlet end of the conduit (4) is connected to the protective shell (2); the air inlet end of the conduit (4) is connected to the air outlet end of the adapter (5); the conduit (4) and the adapter (5) are connected to the fixed bracket (8); and one end of the fixed bracket (8) is connected to a welding head (11).

2. The gun protection device for laser welding according to claim 1, characterized in that: A protective ring (3) is arranged below the protective shell (2); the protective ring (3) is connected to the bottom of the protective shell (2); and the protective ring (3) is connected and fastened to the protective shell (2) via fastening screws (1).

3. The gun protection device for laser welding according to claim 2, characterized in that: The connection between the protection ring (3) and the protection shell (2) is arranged in an inclined manner.

4. The gun protection device for laser welding according to claim 1, characterized in that: A filter element partition (7) is arranged inside the protective shell (2), and the filter element partition (7) divides the internal space of the protective shell (2) into two layers. The filter element partition (7) is connected and fastened to the protective shell (2) via fastening screws (1).

5. The laser welding gun protection device according to claim 1, characterized in that: A quick-pull inflation connector (9) is provided on the top of the protective shell (2), and the quick-pull inflation connector (9) is connected and fastened to the protective shell (2) via a fastening screw (1).

6. The gun protection device for laser welding according to claim 1, characterized in that: An air intake pipe (6) is provided at the air intake end of the adapter (5).

7. The gun protection device for laser welding according to claim 1, characterized in that: The fixing bracket (8) is connected to the welding head (11) via a fixing bolt (10).

8. The gun protection device for laser welding according to claim 1, characterized in that: The conduit (4) is a corrugated conduit.

9. The method for using the gun protection device for laser welding according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Fix the protection ring (3) and the filter element partition (7) on the protection housing (2) by tightening the screws (1); S2: Connect the conduit (4) to the fixed bracket (8) via the adapter (5), and connect the air inlet pipe (6) to the adapter (5); S3: A quick-pull inflatable joint (9) is installed on the protective shell (2), threaded holes are made in the front and rear directions of the moving direction of the welding head (11), and then the protective device is connected to the threaded hole of the welding head (11) through the fixing bolt (10), so that the protective device moves with the laser head welding.

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