Laser welding tool assembly integrating shielding gas conveying and dust removal

Abstract

The invention discloses a laser welding tool assembly integrating shielding gas conveying and dust removal, which comprises a shielding gas output structure for filling a welding area with shielding gas, the compressed air output structures are located on the two sides of the shielding gas output structure and used for outputting high-flow-speed gas to form negative pressure so as to remove dust in a welding area. The shielding gas output structure comprises a first connecting plate, the end, facing the to-be-welded area, of the first connecting plate is provided with a shielding gas inlet flow channel, and the end face, facing the to-be-welded area, of the first connecting plate is provided with a plurality of gas outlet grooves communicating with the shielding gas inlet flow channel to form low-flow-speed gas. The compressed air output structure comprises a second connecting plate, the end, facing the to-be-welded area, of the second connecting plate is provided with a compressed air inlet flow channel, and the end face, facing the to-be-welded area, of the second connecting plate is provided with a plurality of slits communicating with the compressed air inlet flow channel to form high-flow-speed gas. The ends, located on the multiple slits, of the second connecting plate are arranged to be in an arc-shaped chamfer shape for guiding high-flow-speed gas to flow away from the welding area. According to the tool assembly, the protective gas inlet flow channel and the compressed air inlet flow channel are formed in the connecting plate used for being connected with the pressing head, and the protective gas outlet groove for forming low-flow-speed gas and the compressed air outlet slit for forming high-flow-speed gas are formed in the end face, facing the welding area, of the connecting plate. The ends of the slits are arranged to be in an arc-shaped chamfer shape for guiding vertical high-flow-speed gas to flow away from the welding area, the high-flow-speed gas is formed by means of the slits, and if the gas flow speed is high and the pressure is small, negative pressure is formed in the area to promote the gas in the welding area to escape towards the arc-shaped chamfer area. And therefore, dust in the welding area is effectively carried and removed.

Description

Technical Field

[0001] This invention belongs to the field of laser welding fixtures, and particularly relates to a laser welding fixture assembly that integrates protective gas delivery and dust removal. Background Technology

[0002] Laser welding is a precision welding technology that uses a high-energy laser beam as a heat source. By focusing the laser beam at the joint of the workpiece, the material is locally and rapidly melted and solidified to form a strong welded joint.

[0003] Laser welding utilizes inert gases such as argon and helium for protection. The core function of the shielding gas is to isolate the weld pool from air, preventing the molten metal from reacting with oxygen and nitrogen to form oxides and nitrides, thus avoiding defects. Simultaneously, it disperses metal vapor above the weld pool, preventing vapor from adhering to the optical lenses and affecting laser transmission. Some shielding gases can also optimize weld formation through gas flow.

[0004] The method of providing shielding gas needs to be selected based on the welding process (continuous / pulsed, heat conduction / deep penetration welding), workpiece shape, and degree of automation. The mainstream methods can be divided into three main categories: nozzle-type gas supply, chamber-type gas supply, and auxiliary gas supply. Nozzle-type gas supply uses a nozzle integrated with the welding head or installed independently to directly spray the shielding gas onto the molten pool and weld area. It features concentrated airflow, high protection efficiency, and strong flexibility, and is suitable for most laser welding scenarios (such as robotic welding and single-machine welding). Chamber-type gas supply places the workpiece in a sealed chamber, fills the chamber with shielding gas, and maintains a certain gas atmosphere. It is suitable for high-precision welding, welding of active metals (such as titanium alloys and aluminum alloys), or vacuum laser welding scenarios. Auxiliary gas supply is a supplementary protection method added to the main shielding gas system. It is used to solve problems such as back-side oxidation of the weld and multi-layer protection for welding thick plates, and is usually used in conjunction with nozzle-type or chamber-type gas supply.

[0005] Meanwhile, during laser welding, the high temperature causes the metal material to vaporize and produce metal fumes, along with small amounts of harmful gases such as ozone and nitrogen oxides. These gases adhere to the surface of the optical lenses, reducing laser transmission efficiency and affecting welding precision. Therefore, efficient dust removal is an essential supporting process for laser welding production lines. Existing laser welding dust removal systems use integrated devices linked to the welding head, employing specialized equipment to remove dust through suction.

[0006] However, for welding fixtures with small welding areas, difficult-to-escape fumes, and compact structures, adding additional protective gas output equipment or dust removal devices will create obstruction and interference in the welding area, thus affecting the welding process.

[0007] Based on this, we have designed a device that can integrate clamping, protective gas delivery and dust removal using only laser welding fixtures, without the need for additional protective gas supply equipment and dust removal equipment. Summary of the Invention

[0008] Purpose of the invention: The technical problem to be solved by the present invention is to provide a welding fixture assembly that integrates clamping, protective gas delivery and dust removal, effectively solving the problem of interference to welding caused by the use of additional integrated protective gas delivery devices and dust removal devices in welding operations where the welding area is small and the fumes are difficult to escape.

[0009] Technical solution: The present invention is a laser welding fixture assembly that integrates protective gas delivery and dust removal. The fixture assembly includes a protective gas output structure that fills the welding area with protective gas, and a compressed air output structure located on both sides of the protective gas output structure that forms a negative pressure by means of outputting high-velocity protective gas to remove dust from the welding area.

[0010] The protective gas output structure includes a first connecting plate, the end of the first connecting plate facing the area to be welded having a protective gas inlet channel, and the end face of the first connecting plate facing the area to be welded having a plurality of gas outlet grooves connected to the protective gas inlet channel to form a low-flow-rate gas.

[0011] The compressed air output structure includes a second connecting plate, the end of the second connecting plate facing the area to be welded having a compressed air inlet channel, and the end face of the second connecting plate facing the area to be welded having a number of slits that communicate with the compressed air inlet channel to form a high-velocity gas.

[0012] The ends of the second connecting plate located at several slits are configured with an arc-shaped chamfer to guide high-velocity gas to flow away from the welding area.

[0013] Furthermore, the welding fixture assembly has a pressure head connected to the upper end of the second connecting plate on at least one side, facing the area to be welded, for pressing the workpiece to be welded.

[0014] Furthermore, the welding fixture assembly has a protective gas inlet channel located above the compressed air inlet channel in the second connecting plate on at least one side, and the end face of the second connecting plate facing the area to be welded has a plurality of gas outlet grooves that are connected to the protective gas inlet channel to form a low-flow-rate gas.

[0015] Furthermore, the first connecting plate and the second connecting plate of the welding fixture assembly are both fixedly connected to the top plate, and the top plate has a hollow structure corresponding to the welding area.

[0016] Furthermore, the top plate of the welding fixture assembly is driven to move up and down by a drive assembly consisting of elbow clamps, connecting shafts, and L-shaped connecting plates located on both sides of it.

[0017] Furthermore, the lower end of the L-shaped connecting plate of the welding fixture assembly is provided with a positioning post to limit the downward pressing movement of the fixture assembly.

[0018] Furthermore, the top plate of the welding fixture assembly is supported and limited by connecting shafts arranged around its perimeter, and can move up and down along these connecting shafts.

[0019] Furthermore, the protective gas inlet channel and the compressed air inlet channel of the welding fixture are both horizontally installed through their respective connecting plates, and both ends of the protective gas inlet channel and the compressed air inlet channel are connected to an air inlet pipe that communicates with an external air source.

[0020] Beneficial effects: Compared with the prior art, the significant advantages of the present invention are as follows: The tooling assembly has protective gas inlet channels and compressed air inlet channels respectively opened on the connecting plate used to connect the pressure head. Protective gas outlet grooves for forming low-flow-rate gas and compressed air outlet slits for forming high-flow-rate gas are respectively opened on the end face of the connecting plate facing the welding area. The end of the slit is set into an arc-shaped chamfer to guide the vertical high-flow-rate gas to flow away from the welding area. With the help of the slit to form high-flow-rate gas, the high gas velocity and low pressure create a negative pressure in the area, causing the gas in the welding area to escape towards the arc-shaped chamfer area, thereby effectively carrying away and removing dust from the welding area. Attached Figure Description

[0021] Figure 1 This is a product drawing of the laser welding tooling assembly of the present invention;

[0022] Figure 2 This is a line drawing of the laser welding fixture assembly of the present invention;

[0023] Figure 3 The protective gas output structure and compressed air output structure of the laser welding fixture assembly of this invention are fixedly connected to the lines on the top plate. Figure 1 ;

[0024] Figure 4 The protective gas output structure and compressed air output structure of the laser welding fixture assembly of this invention are fixedly connected to the lines on the top plate. Figure 2 ;

[0025] Figure 5 This is a line drawing of the protective gas output structure of the laser welding fixture assembly of the present invention;

[0026] Figure 6 The lines representing the compressed air output structure of the laser welding fixture assembly of this invention. Figure 1 ;

[0027] Figure 7 The lines representing the compressed air output structure of the laser welding fixture assembly of this invention. Figure 2 . Detailed Implementation

[0028] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1 and Figure 2 As shown, the laser welding fixture assembly of the present invention uses a downward pressing method to fix the fixture to be welded. Specifically, the fixture assembly includes a vertically movable top plate 8, which has a hollow structure to provide a welding area for laser welding. The top plate 8 moves vertically via driving devices on both sides. The driving device used in this invention is a driving assembly composed of an elbow clamp 9, a connecting shaft 10, and an L-shaped connecting plate 11, with a positioning post 12 at the lower end of the L-shaped connecting plate 11 to limit the downward pressing movement of the fixture assembly. The connecting shaft 10 is connected to the elbow clamp 9, and one end of the L-shaped connecting plate 11 is fixedly connected to the connecting shaft 10, while the other end is fixedly connected to the top plate 8. This allows the elbow clamp to move vertically when manually operated, thereby driving the L-shaped connecting plate 11 to move vertically, which in turn drives the top plate 8 to move vertically. The driving assembly and movement method used in this invention are well-known in the art, and the movement mechanism will not be elaborated further. The top plate 8 moves horizontally via connecting sliding mechanisms.

[0030] The top plate 8 is fixedly equipped with a protective gas output structure that provides protective gas (inert gas) to the welding area, and compressed air output structures located on both sides of the protective gas output structure to create negative pressure by outputting high-flow-rate protective gas to adsorb, carry away and remove dust from the welding area. Figures 3 to 7 As shown. The protective gas output structure includes a first connecting plate 1 fixedly connected to the top plate 8. The end of the first connecting plate 1 facing the area to be welded has a horizontal protective gas inlet channel 2 that passes through the first connecting plate 1. The end face of the first connecting plate 1 facing the area to be welded has a plurality of gas outlet grooves 3 that communicate with the protective gas inlet channel 2. The plurality of gas outlet grooves 3 are elongated and wide to form a gentle, low-velocity gas flow. The specific width and length can be set according to the actual required flow rate, and the present invention does not impose specific limitations.

[0031] The compressed air output structure is located on both sides of the protective gas output structure. The compressed air output structure also includes a second connecting plate 4 fixedly connected to the top plate 8, and the second connecting plate 4 is arranged parallel to the first connecting plate 1. A compressed air inlet channel 5 is provided at the end of the second connecting plate 4 facing the area to be welded. Several slits 6 are provided on the end face of the second connecting plate 4 facing the area to be welded, communicating with the compressed air inlet channel 5, thereby creating a high-velocity gas flow. Similarly, the specific width of the slits can be adjusted according to actual welding requirements. The end of the second connecting plate 4, below the slits 6, is provided with an outward-facing arc-shaped chamfer 7 structure, thereby guiding the high-speed compressed air blown out of the slits 6 to flow away from the welding area. The high-velocity compressed air corresponds to a low pressure, relatively forming a negative pressure. Therefore, under the gas pressure in the welding area, the dust generated by laser welding can flow towards the area corresponding to the arc-shaped chamfer of the slits, achieving dust removal.

[0032] To further increase the protective gas, a protective gas inlet channel 2 can be provided on the second connecting plates 4 on both sides, or on either side, and this protective gas inlet channel 2 is offset from the compressed air channel 5, that is, the protective gas inlet channel 2 is located above the compressed air channel 5. Similarly, the end face of the second connecting plate 4 facing the area to be welded has a number of gas outlet grooves 3 that are connected to the protective gas inlet channel 2 to form a low-velocity gas flow.

[0033] In addition to the above, the pressure head of the welding fixture of the present invention is disposed at the lower end of the second connecting plate 4 on at least one side (not shown in the figure) to clamp and fix the workpiece to be welded. Both ends of the protective gas inlet channel 2 and the compressed air inlet channel 5 are connected to an air inlet pipe 13 that communicates with an external air source.

Claims

1. A laser welding tooling assembly integrating protective gas delivery and dust extraction, characterized in that, The tool assembly comprises a protective gas output structure for filling the welding area with protective gas, and a compressed air output structure located on both sides of the protective gas output structure for forming negative pressure by outputting high flow rate protective gas to remove dust from the welding area; The protective gas output structure comprises a first connecting plate (1) having a protective gas inlet flow channel (2) formed in the end thereof facing the welding area, and a plurality of gas outlet grooves (3) formed in the end surface thereof facing the welding area and communicating with the protective gas inlet flow channel (2) to form low flow rate gas; The compressed air output structure comprises a second connecting plate (4) having a compressed air inlet flow channel (5) formed in the end thereof facing the welding area, and a plurality of slits (6) formed in the end surface thereof facing the welding area and communicating with the compressed air inlet flow channel (5) to form high flow rate gas; The end portion of the second connecting plate (4) is provided with an arc-shaped chamfer (7) for guiding the high flow rate gas to flow away from the welding area.

2. The integrated protective gas delivery and dust extraction laser welding tooling assembly of claim 1, wherein, At least one side of the second connecting plate (4) is connected with a pressing head for pressing the workpiece to be welded.

3. The integrated shielding gas delivery and dust extraction laser welding tooling assembly of claim 2, wherein, At least one side of the second connecting plate (4) is provided with a protective gas inlet flow channel (2) above the compressed air inlet flow channel (5), and a plurality of gas outlet grooves (3) formed in the end surface thereof facing the welding area and communicating with the protective gas inlet flow channel (2) to form low flow rate gas.

4. The integrated shielding gas delivery and dust extraction laser welding tooling assembly of claim 1, wherein, The first connecting plate (1) and the second connecting plate (4) are fixedly connected to the top plate (8), and the top plate (8) is provided with a hollow structure corresponding to the welding area.

5. The integrated protective gas delivery and dust extraction laser welding tooling assembly of claim 4, wherein, The top plate (8) is driven to move up and down by a driving assembly comprising an elbow clamp (9), a connecting shaft (10) and an L-shaped connecting plate (11) located on both sides thereof.

6. The integrated shielding gas delivery and dust extraction laser welding tooling assembly of claim 5, wherein, The lower end of the L-shaped connecting plate (11) is provided with a positioning column (12) for limiting the downward movement of the tool assembly.

7. The integrated shielding gas delivery and particulate removal laser welding tooling assembly of claim 4, wherein, The top plate (8) is supported and limited by the connecting shaft (10) arranged around the top plate (8) and can move up and down along the connecting shaft (11).

8. The integrated shielding gas delivery and particulate removal laser welding tooling assembly of claim 1, wherein, The protective gas inlet flow channel (2) and the compressed air inlet flow channel (5) are arranged horizontally through the corresponding connecting plates, and the two ends of the protective gas inlet flow channel (2) and the compressed air inlet flow channel (5) are connected with an air inlet pipeline (13) communicating with an external gas source.

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