Laser welding lens protection device and laser welding machine

Abstract

The utility model relates to the technical field of laser welding, and discloses a laser welding lens protection device which comprises a body, the body is provided with a light channel and an air channel, the light channel and the air channel intersect and are communicated, the light channel is arranged on the body in a penetrating mode in the first direction, and the light channel is arranged in the projection range of the air channel in the first direction. The air channel is provided with an air inlet and an air outlet, an air inlet and an air outlet which are oppositely arranged are formed in the air channel on the inner wall of the light channel, the air channel comprises a first air channel and a second air channel, the first air channel is connected with the air inlet and the air inlet, the second air channel is connected with the air outlet and the air outlet, and the air inlet is connected with an external air source; when the gas inlet is communicated with an external gas source, the gas channel forms an isolation protection gas curtain in the light channel. The isolation protection air curtain completely covers a light channel, isolation protection is formed between the lens and a molten pool, splashing welding slag is isolated, the lens is protected, the problem that the lens is polluted or damaged by the welding slag is solved, the maintenance time of the lens is shortened, the use cost of the lens is reduced, and the welding efficiency and quality are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser welding, in particular to a laser welding lens protection device and a laser welding machine. Background Art

[0002] During the production process of plate heat exchangers, laser welding is required for the heat exchangers. A high-energy-density laser beam is used as the heat source. After reflection from the lens, the laser radiation heats the surface to be processed, melting the workpiece to form a specific molten pool, and completing the welding between the materials.

[0003] Existing laser welding equipment does not have a protective device between the lens and the workpiece processing surface. The lens is directly connected to the welding molten pool. During the welding process, because the processed material or the workpiece surface is not cleaned properly and there are residual oil stains or pollutants, laser welding will produce welding spatter, which will not only seriously affect the surface quality of the weld, but also directly splash onto the lens through the laser beam channel, causing contamination and damage to the lens, affecting welding efficiency and quality. Utility Model Content

[0004] In response to the above-mentioned defects, the purpose of this utility model is to provide a laser welding lens protection device and a laser welding machine to isolate the spattering welding slag and protect the lens. To achieve this purpose, this utility model adopts the following technical solutions:

[0005] A laser welding lens protection device comprises a body, the body having an optical path and an air path, the optical path intersecting and communicating with the air path, the optical path penetrating the body along a first direction, and the optical path being within a projection range of the air path along the first direction;

[0006] The air duct is provided with a gas inlet and a gas outlet, and the air duct is formed with an air inlet and an air outlet arranged opposite to each other on the inner wall of the light channel. The air duct includes a first air duct and a second air duct, the first air duct connects the gas inlet and the gas inlet, the second air duct connects the gas outlet and the gas outlet, and the gas inlet is connected to an external gas source; when the gas inlet is connected to the external gas source, the air duct forms an isolation protective air curtain in the light channel.

[0007] Preferably, the thickness h1 of the air inlet is 0.2 mm to 1 mm, the ratio of the width d1 to the thickness h1 of the air inlet is 30 to 200, the width d2 of the air outlet is greater than or equal to the width d1 of the air inlet, the thickness h2 of the air outlet is greater than or equal to the thickness h1 of the air inlet, the air inlet is within the projection range of the air outlet along the second direction, the cross-sectional area of ​​the second air duct perpendicular to the second direction gradually increases along the direction of gas travel, and the second air duct is a straight bell-mouth shape.

[0008] Preferably, an air chamber is further provided, and the air chamber is provided in the air intake section of the first air duct.

[0009] Preferably, the air chamber is provided with a buffer surface, and the buffer surface is used to guide the gas to flow smoothly from the gas inlet into the air inlet and be blown out along the second direction.

[0010] Preferably, the main body includes a top cover and a bottom cover, the top cover and the bottom cover are buckled together, the air duct is arranged between the buckling surfaces of the top cover and the bottom cover along the second direction, and the light path passes through the top cover and the bottom cover along the first direction, and the first direction is arranged perpendicular to the second direction.

[0011] Preferably, the bottom of the top cover is provided with a plurality of mounting holes with internal threads, the bottom cover is provided with mounting through holes corresponding to the mounting holes, and the bottom cover is mounted on the top cover by means of bolts passing through the mounting through holes.

[0012] A laser welding machine comprises a laser welding host, a lens, a light cylinder, an air nozzle and the above-mentioned laser welding lens protection device.

[0013] Preferably, the main body is provided with a fixing structure of the light cylinder, the light path is a cylindrical channel, and the light path and the light cylinder are designed to be coaxial.

[0014] Preferably, the main body is provided with a gas nozzle mounting hole, and the gas nozzle mounting hole is arranged on a side of the main body close to the workpiece to be processed.

[0015] The technical solution provided by the utility model may have the following beneficial effects:

[0016] By forming an isolation protection air curtain, the isolation protection air curtain completely covers the light path, forming isolation protection between the lens and the molten pool, isolating the splashing welding slag, protecting the lens, solving the problem of the lens being contaminated or damaged by welding slag, reducing the maintenance time and use cost of the lens, and improving the efficiency and quality of welding.

[0017] By adopting a structure in which the gas outlet is larger than the gas inlet, a jet structure is formed to guide the gas into the gas outlet and discharge it from the gas outlet, thereby solving the problem of poor protection effect of the isolation protective air curtain due to unstable airflow and welding slag being blown to the workpiece surface affecting the welding quality.

[0018] By adding an air chamber to form a gas buffer zone, the gas pressure range applicable to the protection device is increased, solving the problem of unstable airflow caused by gas pressure changes and poor protection effect of the isolation protection air curtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a cross-sectional view of an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of the prior art.

[0022] Figure 4 This is a structural diagram of an embodiment of the present invention.

[0023] Among them: light path 1, gas inlet 21, gas outlet 22, air inlet 23, air outlet 24, first air channel 31, second air channel 32, air chamber 33, buffer surface 34, top cover 41, bottom cover 42, mounting through hole 43, laser beam 5, welding slag 6, isolation protection air curtain 7, lens 8, light tube 9. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish between the described features, without distinction of order or importance.

[0026] In the description of the present invention, unless otherwise specified, “a plurality of” means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] The following describes embodiments of the present utility model in conjunction with the accompanying drawings.

[0029] A laser welding lens protection device includes a body, the body having an optical path 1 and an air path, the optical path 1 intersecting and communicating with the air path, the optical path 1 penetrating the body along a first direction, and the optical path 1 being located within a projection range of the air path along the first direction;

[0030] The air duct is provided with a gas inlet 21 and a gas outlet 22. The air duct is formed with an air inlet 23 and an air outlet 24 which are relatively arranged on the inner wall of the light channel. The air duct includes a first air duct 31 and a second air duct 32. The first air duct 31 connects the gas inlet 21 and the air inlet 23, and the second air duct 32 connects the air outlet 24 and the gas outlet 22. The gas inlet 21 is connected to an external air source; when the gas inlet 21 is connected to an external air source, the air duct forms an isolation protective air curtain 7 in the light channel.

[0031] like Figure 3 As shown, there is no protective device in the current technology, and laser welding will produce splashing slag 6. Part of the slag 6 will directly splash onto the lens 8 through the laser beam channel, causing contamination and damage to the lens 8.

[0032] like Figure 2 As shown, this solution adopts this structure. The light path 1 vertically passes through the main body, the air path intersects with the light path 1, and the air path completely covers the light path 1. During laser welding, the laser beam 5 is reflected by the external lens 8 and passes through the main body from the light path 1 to process the workpiece to form a molten pool. High-pressure gas is introduced into the air path to form an isolation protection air curtain 7. The isolation protection air curtain 7 completely covers the light path 1, forming an isolation protection between the lens 8 and the molten pool, isolating the splashing welding slag 6, and protecting the lens 8, thereby solving the problem of the lens 8 being contaminated or damaged by the welding slag 6, reducing the maintenance time and use cost of the lens 8, and improving the efficiency and quality of welding.

[0033] like Figure 1 The gas passes through the gas inlet 21, the first gas channel 31, the gas inlet 23, the gas outlet 24, the second gas channel 32 and the gas outlet 22 in sequence, and the welding slag 6 splashed toward the lens 8 is taken out from the gas outlet 22 by the gas.

[0034] Preferably, the thickness h1 of the air inlet 23 is 0.2 mm to 1 mm, the ratio of the width d1 to the thickness h1 of the air inlet 23 is 30 to 200, the width d2 of the air outlet 24 is greater than or equal to the width d1 of the air inlet 23, the thickness h2 of the air outlet 24 is greater than or equal to the thickness h1 of the air inlet 23, the air inlet 23 is within the projection range of the air outlet 24 along the second direction, the cross-sectional area of ​​the second air duct 32 perpendicular to the second direction gradually increases along the direction of gas travel, and the second air duct 32 is a straight bell-mouth shape.

[0035] like Figure 1 、 Figure 2 and Figure 4 As shown, with this structure, the air inlet 23 forms a narrow, slender gap. When high-pressure gas is introduced, the gas forms a flat, insulating protective air curtain 7 along the second direction in the airway, blocking the passage of welding slag 6 to protect the lens 8. At the same time, by adopting a structure in which the air outlet 24 is larger than the air inlet 23, a jet structure is formed, guiding the gas into the air outlet 24 and out through the gas outlet 22. This solves the problem of poor protection of the insulating protective air curtain 7 due to unstable airflow, and the welding slag 6 being blown onto the workpiece surface, affecting welding quality.

[0036] In a specific embodiment, the first direction is a vertical direction, and the second direction is a horizontal direction.

[0037] Preferably, an air chamber 33 is further provided, and the air chamber 33 is provided in the air intake section of the first air duct 31 .

[0038] With this structure, a gas buffer zone is formed by adding an air chamber 33, which increases the gas pressure range applicable to the protection device, thereby solving the problem of unstable airflow caused by gas pressure changes and poor protection effect of the isolation protection air curtain 7.

[0039] Preferably, the air chamber 33 is provided with a buffer surface 34 , and the buffer surface 34 is used to guide the gas to smoothly flow from the gas inlet 21 into the air inlet 23 and be blown out along the second direction.

[0040] In a specific embodiment, the inner wall of the air chamber 33 is designed as an arc surface. After the gas enters through the circular gas inlet 21, the inner wall of the arc surface serves as a buffer surface 34 to guide the gas to flow into the small and narrow air inlet 23, while controlling the gas to blow through the light path along the second direction to form a stable isolation protection air curtain 7.

[0041] Preferably, the main body includes a top cover 41 and a bottom cover 42, the top cover 41 and the bottom cover 42 are buckled together, the air duct is arranged between the buckling surfaces of the top cover 41 and the bottom cover 42 along the second direction, and the light path 1 passes through the top cover 41 and the bottom cover 42 along the first direction, and the first direction is arranged perpendicular to the second direction.

[0042] Preferably, the bottom of the top cover 41 is provided with a plurality of mounting holes with internal threads, and the bottom cover 42 is provided with mounting through holes 43 corresponding to the mounting holes. The bottom cover 42 is mounted on the top cover 41 by means of bolts passing through the mounting through holes 43 .

[0043] The structure of the top cover 41 and the bottom cover 42 is adopted, and the airway is set between the top cover 41 and the bottom cover 42, which facilitates the processing and subsequent cleaning of the airway and solves the problem of inconvenience in airway processing and cleaning.

[0044] A laser welding machine comprises a laser welding host, a lens 8, a light tube 9, an air nozzle and the above-mentioned laser welding lens protection device.

[0045] Preferably, the main body is provided with a fixing structure of the light cylinder 9 , the light path 1 is a cylindrical channel, and the light path 1 and the light cylinder 9 are designed to be coaxial.

[0046] In a specific embodiment, a light tube 9 is provided for adjusting the laser beam 5, and an external thread is provided on the outside of the light tube 9. An external thread of the same specification as that of the light tube 9 is provided on the outside of the top cover 41. The external thread of the top cover 41 is coaxially arranged with the light path 1, and the protective device and the light tube 9 are connected by a corresponding nut with internal thread. This structure is adopted to ensure that the light path 1 of the protective device is coaxial with the light tube 9.

[0047] Preferably, the main body is provided with a gas nozzle mounting hole, and the gas nozzle mounting hole is arranged on a side of the main body close to the workpiece to be processed.

[0048] In a specific embodiment, a gas nozzle mounting hole is provided at the bottom of the bottom cover 42, and the gas nozzle mounting hole has an internal thread coaxial with the light path 1, and the internal thread matches the external thread of the gas nozzle. The gas nozzle is used to supply welding shielding gas, and the welding shielding gas provides a protective atmosphere for welding.

[0049] Other structures and operations according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0050] Throughout this specification, references to terms such as "embodiment" and "example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A laser welding lens protection device, characterized in that: The device comprises a body, wherein the body has a light channel and an air channel, the light channel intersects and communicates with the air channel, the light channel is arranged through the body along a first direction, and the light channel is arranged within a projection range of the air channel along the first direction; The air duct is provided with a gas inlet and a gas outlet, and the air duct is formed with an air inlet and an air outlet arranged opposite to each other on the inner wall of the light channel. The air duct includes a first air duct and a second air duct, the first air duct connects the gas inlet and the gas inlet, the second air duct connects the gas outlet and the gas outlet, and the gas inlet is connected to an external gas source; when the gas inlet is connected to the external gas source, the air duct forms an isolation protective air curtain in the light channel.

2. The laser welding lens protection device according to claim 1, characterized in that: The thickness h1 of the air inlet is 0.2mm~1mm, the ratio of the width d1 of the air inlet to the thickness h1 is 30~200, the width d2 of the air outlet is greater than or equal to the width d1 of the air inlet, the thickness h2 of the air outlet is greater than or equal to the thickness h1 of the air inlet, the air inlet is within the projection range of the air outlet along the second direction, the cross-sectional area of ​​the second air duct perpendicular to the second direction gradually increases along the direction of gas travel, and the second air duct is a straight bell-mouth shape.

3. The laser welding lens protection device according to claim 1, characterized in that: An air chamber is also provided, and the air chamber is provided in the air intake section of the first air duct.

4. The laser welding lens protection device according to claim 3, characterized in that: The air chamber is provided with a buffer surface, and the buffer surface is used to guide the gas to flow smoothly from the gas inlet into the air inlet and be blown out along the second direction.

5. The laser welding lens protection device according to claim 1, characterized in that: The main body includes a top cover and a bottom cover, the top cover and the bottom cover are buckled together, the air channel is arranged between the buckling surfaces of the top cover and the bottom cover along the second direction, and the light path passes through the top cover and the bottom cover along the first direction, and the first direction is arranged perpendicular to the second direction.

6. The laser welding lens protection device according to claim 5, characterized in that: The bottom of the top cover is provided with a plurality of mounting holes with internal threads, and the bottom cover is provided with mounting through holes corresponding to the mounting holes. The bottom cover is mounted on the top cover by passing bolts through the mounting through holes.

7. A laser welding machine, characterized in that: The invention comprises a laser welding host, a lens, a light tube, an air nozzle and the laser welding lens protection device according to any one of claims 1 to 6.

8. The laser welding machine according to claim 7, characterized in that: The main body is provided with a fixing structure of the light cylinder, the light path is a cylindrical channel, and the light path and the light cylinder are designed to be coaxial.

9. The laser welding machine according to claim 7, characterized in that: The main body is provided with an air nozzle mounting hole, and the air nozzle mounting hole is arranged on a side of the main body close to the workpiece to be processed.

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