Laser welding dust removal equipment

Abstract

This utility model relates to the field of battery production equipment technology, and discloses a laser welding dust removal device, including a dust removal structure and a laser welding structure. The dust removal structure includes a dust removal hood and a dust removal pipe. The dust removal pipe is used to connect to an external negative pressure device. The dust removal hood has an open end and a clearance hole arranged opposite each other. The laser welding structure can pass through the clearance hole and extend to the open end. The dust removal hood has multiple interconnected conical cavities, which are distributed around the clearance hole. The cavities are connected to the open ends, and the ends of the cavities away from the open ends correspond one-to-one with and are connected to the dust removal pipe. Each cavity has a first end connected to the dust removal pipe and a second end adjacent to the open end, with the size of the first end being smaller than the size of the second end. The laser welding dust removal device of this utility model can reduce the probability of dust particles adhering to the cavity walls and improve the dust removal effect.

Description

Technical Field

[0001] This utility model relates to the field of battery production equipment technology, and in particular to a laser welding dust removal device. Background Technology

[0002] In the production of lithium batteries, laser welding is frequently used. This process typically requires nitrogen protection to prevent oxidation of the weld joints, and dust removal is necessary to collect and remove the welding slag that splatters during welding. If the welding slag is not effectively removed, residual metal particles may enter the battery during production, causing partial discharge or even short circuits during later use, thus affecting battery quality.

[0003] Currently, lithium battery welding processes often involve coaxial welding scenarios using lasers and nitrogen (or shielding gas) for dust removal. The laser and shielding gas typically share a coaxial channel, exiting from the same outlet. The advantage of this welding device is its simple structure, eliminating the need for additional shielding gas channels and easily achieving high gas concentrations at the welding point. However, because the shielding gas is blown downwards above the welding point, it scatters the weld slag, resulting in poor slag mobility and difficulty in effective collection. Furthermore, this type of laser welding device can only remove some of the weld slag spatter, primarily limiting its effectiveness to removing small welding fumes or particles. It is not ideal for removing large weld slag particles larger than 0.1 mm in diameter, which often poses a greater hazard.

[0004] Therefore, existing laser welding dust removal devices employ a non-coaxial arrangement of the laser channel and protective gas channel, and add an inner mesh cover at the bottom of the device. This structure aims to achieve a more uniform velocity distribution within the dust removal hood and ensure consistent dust removal efficiency in all directions. However, in practical applications, it has been found that the presence of the inner mesh cover obstructs airflow within the hood, resulting in a lower overall flow rate for the laser welding dust removal device. Furthermore, the inner mesh cover blocks some dust particles from entering the hood, leading to lower dust removal efficiency. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a laser welding dust removal device that can reduce the probability of dust particles adhering to the cavity wall and improve the dust removal effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A laser welding dust removal device is provided, comprising a dust removal structure and a laser welding structure. The dust removal structure includes a dust removal hood and a dust removal pipe. The dust removal pipe is used to connect to an external negative pressure device. The dust removal hood has an opening end and a clearance hole arranged opposite to each other. The laser welding structure can pass through the clearance hole and extend to the opening end. The dust removal hood has a plurality of interconnected conical cavities distributed around the clearance hole. The cavities are connected to the opening end, and the ends of the cavities away from the opening end correspond one-to-one with and are connected to the dust removal pipe. Each cavity has a first end connected to the dust removal pipe and a second end adjacent to the opening end, the size of the first end being smaller than the size of the second end.

[0008] As a further embodiment of the laser welding dust removal device, the first end of the cavity is inclined upwards in a direction away from the clearance hole.

[0009] As a further embodiment of the laser welding dust removal device, the dust removal pipe is inclined, and the inclination direction of the dust removal pipe is consistent with the inclination direction of the corresponding cavity.

[0010] As a further embodiment of the laser welding dust removal device, the laser welding structure is coaxial with the clearance hole, and the angle between the axis of the dust removal pipe and the axis of the clearance hole is α1, where α1 is an acute angle.

[0011] As a further option for the laser welding dust removal device, α1 is greater than 15° and less than 90°.

[0012] As a further embodiment of the laser welding dust removal device, the dust removal hood includes a plurality of conical hoods evenly distributed around the laser welding structure, each conical hood having a cavity, and the end of the conical hood away from the opening end communicating with the dust removal pipe; the side wall of the conical hood facing the laser welding structure has a groove communicating with the cavity, and along the circumference of the dust removal hood, the opposite sides of two adjacent conical hoods are sealed together, and the grooves of all the conical hoods form the clearance hole.

[0013] As a further embodiment of the laser welding dust removal device, the dust removal hood further includes an annular end, which is located at the lower end of the conical hood; the annular end has a third end and a fourth end along its axial direction, the third end is connected to the side of all the conical hoods away from the groove, the fourth end is the opening end, and the plane where the third end is located is inclined relative to the plane where the fourth end is located.

[0014] As a further embodiment of the laser welding dust removal device, the laser welding structure includes a laser beam and a welding head. The welding head has a conical channel along its axial direction. The inner diameter of the end of the conical channel adjacent to the opening is smaller than the inner diameter of the end away from the opening. The welding head passes through the clearance hole and extends to the opening. The laser beam can pass through the conical channel to perform welding. The axis of the laser beam is inclined relative to the vertical line.

[0015] As a further embodiment of the laser welding dust removal device, the angle between the axis of the laser beam and the vertical line is α2, where α2 is less than 15°, and the angle between the axis of the laser beam and the plane containing the opening end is α3, where α3 = α2 + 90°.

[0016] As a further embodiment of the laser welding dust removal device, the sum of the cross-sectional areas of the dust removal ports of all the dust removal pipes is S1, and the cross-sectional area of ​​the open end is S2, where S1 ≥ 20%S2.

[0017] Beneficial effects:

[0018] This invention designs the inner cavity of the dust collector hood as multiple interconnected conical cavities. The cavities narrow towards the dust collector tube, allowing dust particles generated during laser welding to orderly converge towards the dust collector tube along the narrowing direction of the cavities. This results in good particle flow, with most dust particles impacting the cavity walls at a small angle, reducing the likelihood of dust particles adhering to or settling on the cavity walls. The dust collector tube of this invention has a high air velocity and a high dust particle capture rate, thus effectively improving dust removal efficiency. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of the laser welding dust removal device described in Embodiment 1 of this utility model;

[0021] Figure 2 This is a top view schematic diagram of the laser welding dust removal device described in Embodiment 1 of this utility model;

[0022] Figure 3 for Figure 2 Schematic diagram of the sectional view along the central AA direction;

[0023] Figure 4 This is a dust particle distribution diagram of a simulated welding dust test using the laser welding dust removal device described in Embodiment 1 of this utility model;

[0024] Figure 5This is a diagram showing the centerline velocity distribution of the dust collection tube at the dust collection port in a simulated welding dust test using the laser welding dust removal device described in Embodiment 1 of this utility model.

[0025] Figure 6 This is a dust particle velocity cloud map of the dust removal tube used in the simulated welding dust test of the laser welding dust removal device described in Embodiment 1 of this utility model.

[0026] Figure 7 This is a schematic diagram of the laser welding dust removal mechanism described in Comparative Example 1 of this utility model;

[0027] Figure 8 This is a top view schematic diagram of the laser welding dust removal mechanism described in Comparative Example 1 of this utility model;

[0028] Figure 9 for Figure 8 Schematic diagram of the BB-direction section;

[0029] Figure 10 This is a dust particle distribution diagram of the laser welding dust removal mechanism described in Comparative Example 1 of this utility model, simulating a welding dust test.

[0030] Figure 11 This is a diagram showing the centerline velocity distribution of the dust collection tube at the dust collection port of the laser welding dust removal mechanism described in Comparative Example 1 of this utility model, simulating a welding dust test.

[0031] Figure 12 This is a dust particle velocity cloud map of the dust removal tube of the laser welding dust removal mechanism described in Comparative Example 1 of this utility model, simulating welding dust testing.

[0032] Figure 13 This is a schematic diagram of the laser welding dust removal mechanism described in Comparative Example 2 of this utility model;

[0033] Figure 14 This is a top view schematic diagram of the laser welding dust removal mechanism described in Comparative Example 2 of this utility model;

[0034] Figure 15 for Figure 14 Schematic diagram of cross-section along the CC direction;

[0035] Figure 16 This is a dust particle distribution diagram of the laser welding dust removal mechanism described in Comparative Example 2 of this utility model, simulating welding dust test.

[0036] Figure 17 This is a diagram showing the centerline velocity distribution of the dust collection tube at the dust collection port of the laser welding dust removal mechanism described in Comparative Example 2 of this utility model, simulating welding dust testing.

[0037] Figure 18 This is a dust particle velocity cloud map of the dust removal tube used in the simulated welding dust test of the laser welding dust removal mechanism described in Comparative Example 2 of this utility model.

[0038] Figures 1 to 3 middle:

[0039] 100. Dust removal structure; 110. Dust hood; 1101. Open end; 1102. Clearance hole; 1103. Cavity; 111. Conical hood; 1111. Arc-shaped side plate; 1112. Trapezoidal side plate; 112. Annular end; 120. Dust removal pipe; 200. Laser welding structure; 210. Laser beam; 220. Welding head; 2201. Conical channel; 221. Welding head body; 222. Welding nozzle.

[0040] Figures 7 to 9 middle:

[0041] 300. Dust collector cover; 400. Inner mesh cover.

[0042] Figures 13 to 15 middle:

[0043] 500, dust cover; 600, laser beam. Detailed Implementation

[0044] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.

[0048] Example 1

[0049] like Figures 1 to 3 As shown, an embodiment of this utility model provides a laser welding dust removal device, including a dust removal structure 100 and a laser welding structure 200. The dust removal structure 100 includes a dust removal hood 110 and a dust removal pipe 120. The dust removal pipe 120 is used to connect to an external negative pressure device. The dust removal hood 110 has an opening end 1101 and a clearance hole 1102 that are arranged opposite to each other. The laser welding structure 200 can pass through the clearance hole 1102 and extend to the opening end 1101. The dust removal hood 110 has a plurality of interconnected conical cavities 1103. The plurality of cavities 1103 are distributed around the clearance hole 1102. The cavities 1103 are connected to the opening end 1101, and the end of the cavity 1103 away from the opening end 1101 corresponds to and is connected to the dust removal pipe 120. The cavity 1103 has a first end connected to the dust removal pipe 120 and a second end adjacent to the opening end 1101. The size of the first end is smaller than the size of the second end.

[0050] In this embodiment, the inner cavity of the dust collector hood 110 is designed as multiple interconnected conical cavities 1103, which narrow towards the dust collector tube 120. The cavities 1103 are not coaxial with the laser welding structure 200. Dust particles generated during laser welding will orderly converge towards the dust collector tube 120 along the narrowing direction of the cavities 1103. The dust particles have good fluidity, and most of them impact the cavity wall of the cavities 1103 at a small angle, reducing the likelihood of dust particles adhering to or settling on the cavity wall. Therefore, the dust removal efficiency of the laser welding dust removal device in this embodiment is high.

[0051] Optionally, the cavity 1103 can be a conical, triangular, square pyramidal, or other conical structure.

[0052] Furthermore, the first end of the cavity 1103 is inclined upward in a direction away from the clearance hole 1102.

[0053] In this embodiment, the cavity 1103 is tilted, which allows most of the dust ions generated during laser welding to splash toward the cavity 1103, thereby improving the dust collection efficiency of the dust hood 110 in capturing dust ions.

[0054] Furthermore, the dust removal pipe 120 is inclined, and the inclination direction of the dust removal pipe 120 is consistent with the inclination direction of the corresponding cavity 1103.

[0055] In this embodiment, by designing the tilt direction of the dust removal pipe 120 to be consistent with the tilt direction of the cavity 1103, the resistance can be reduced and the wind speed of dust particles entering the dust removal pipe 120 through the cavity 1103 can be increased.

[0056] Furthermore, the laser welding structure 200 is coaxial with the clearance hole 1102, and the angle between the axis of the dust removal pipe 120 and the axis of the clearance hole 1102 is α1, where α1 is an acute angle.

[0057] In this embodiment, by designing the included angle α1 between the axis of the dust removal pipe 120 and the axis of the clearance hole 1102 as an acute angle, the axis of the dust removal pipe 120 can be closer to the splash direction of most of the dust ions generated by laser welding.

[0058] Furthermore, α1 is greater than 15° and less than 90°.

[0059] If α1 is less than or equal to 15°, it will increase the probability of dust ions adhering to the cavity wall of cavity 1103; if α1 is greater than or equal to 90°, it will affect the dust ion capture efficiency.

[0060] Optionally, the included angle α1 between the axis of the dust removal pipe 120 and the axis of the clearance hole 1102 can be 16°, 17.5°, 20°, 22.5°, 25°, 27.5°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80° or 85°, etc.

[0061] In this embodiment, the dust removal hood 110 includes a plurality of conical hoods 111 evenly distributed around the laser welding structure 200. Each conical hood 111 has a cavity 1103. The end of the conical hood 111 away from the opening end 1101 is connected to the dust removal pipe 120. The side wall of the conical hood 111 facing the laser welding structure 200 has a groove that communicates with the cavity 1103. Along the circumference of the dust removal hood 110, the opposite sides of two adjacent conical hoods 111 are sealed together. The grooves of all the conical hoods 111 form a clearance hole 1102.

[0062] In this embodiment, each conical hood 111 contains a cavity 1103. The conical hood 111 is connected to a negative pressure device for air extraction via a dust removal pipe 120. Dust particles generated during laser welding enter each cavity 1103 under negative pressure and are discharged through the dust removal pipe 120. Since the conical hoods 111 are evenly distributed around the laser welding structure 200, the dust removal effect in each area within the dust removal hood 110 can be kept basically consistent.

[0063] Optionally, all the conical covers 111 can be arranged in a square around the laser welding structure 200, or they can be arranged in a circular shape around the laser welding structure 200, preferably in a circular shape.

[0064] The number of conical covers 111 in this embodiment can be four, three, or more. For example, this embodiment has four conical covers 111, which are arranged in a circular shape (or square shape). The four conical covers 111 can be integrally formed, or they can be welded together along the circumference of the dust collector cover 110, with opposite sides of adjacent conical covers 111 connected to achieve a seal.

[0065] For example, in this embodiment, the external shape of the conical cover 111 is consistent with the shape of the internal cavity 1103. Figure 1 and Figure 2 As shown, the conical cover 111 is formed by connecting the arc-shaped side plate 1111 and the trapezoidal side plate 1112 with an isosceles trapezoidal cross section. The groove is opened at the end of the trapezoidal side plate 1112 away from the dust removal pipe 120, and the opposite sides of two adjacent conical covers 111 are sealed together along the circumferential direction, so that all the grooves surround the clearance hole 1102.

[0066] The clearance hole 1102 can be a circular hole or a square hole, etc., preferably a circular hole.

[0067] Furthermore, the dust hood 110 also includes an annular end 112, which is located at the lower end of the conical hood 111; the annular end 112 has a third end and a fourth end along its axial direction, the third end is connected to the side of all the conical hoods 111 away from the groove, and the fourth end is the opening end 1101, and the plane where the third end is located is inclined relative to the plane where the fourth end is located.

[0068] In this embodiment, when the laser welding dust removal device is placed on the welding workpiece, the laser welding dust removal device can be in an inclined state under the support of the annular end 112, that is, the axis of the clearance hole 1102 is inclined relative to the vertical line, while the axis of the laser welding structure 200 is coaxial with the axis of the clearance hole 1102, so the laser beam 210 of the laser welding structure 200 can maintain a suitable tilt angle.

[0069] For example, the shape of the annular end 112 in this embodiment is equivalent to the shape of a cylinder after a portion has been obliquely cut off. When the laser welding dust removal device is positioned on the workpiece, the fourth end of the annular end 112 is in a horizontal plane and the third end is in an inclined state, thereby keeping the axis of the laser beam 210 of the laser welding structure 200 inclined and preventing the laser welding structure 200 from shaking and affecting the welding effect.

[0070] like Figure 3 As shown, the laser welding structure 200 includes a laser beam 210 and a welding head 220. The welding head 220 has a conical channel 2201 along its axial direction. The inner diameter of the end of the conical channel 2201 adjacent to the opening end 1101 is smaller than the inner diameter of the end away from the opening end 1101. The welding head 220 passes through the clearance hole 1102 and extends to the opening end 1101. The laser beam 210 can pass through the conical channel 2201 to perform welding. The axis of the laser beam 210 is inclined relative to the vertical line.

[0071] In this embodiment, the axis of the laser beam 210 is inclined relative to the vertical line, that is, the incident direction of the laser beam 210 has a certain tilt angle. By designing the tilt angle, welding defects such as porosity and lack of fusion can be reduced, and the welding quality can be improved. Since the incident laser beam 210 is conical, in this embodiment, a conical channel 2201 is opened along its axis in the welding head 220, which can adapt to the shape of the incident laser beam 210 and accurately guide the laser beam 210 to the welding area.

[0072] The welding head 220 includes a welding head body 221 and a welding nozzle 222. The welding head body 221 includes a conical section and a cylindrical section. The smaller end of the conical section is connected to the cylindrical section. A limiting step is provided at the connection between the cylindrical section and the conical section and inside the conical channel 2201. The outer wall of the welding nozzle 222 has a cylindrical area and a conical area. The cylindrical area is located at the limiting step, and the conical area is located outside the cylindrical section. The conical channel passes through the welding head body 221 and the welding nozzle 222.

[0073] Furthermore, the angle between the axis of the laser beam 210 and the vertical line is α2, where α2 is less than 15°, and the angle between the axis of the laser beam 210 and the plane containing the opening end 1101 is α3, where α3 = α2 + 90°.

[0074] Since the angle α2 between the axis of the laser beam 210 and the vertical line is generally less than 15°, the corresponding angle α3 between the axis of the laser beam 210 and the plane containing the opening end 1101 is greater than 90° and less than 105°. This embodiment, by controlling the angle α3 between the plane containing the opening end 1101 and the axis of the laser beam 210 between 90° and 105°, ensures that the angle between the axis of the laser beam 210 and the plane containing the opening end 1101 remains within a suitable range. Simultaneously, it keeps the opening end 1101 horizontal with the surface of the workpiece to be welded, preventing gaps between the opening end 1101 and the workpiece from causing dust escape.

[0075] Furthermore, the sum of the cross-sectional areas of the dust collection ports of all the dust collection pipes 120 is S1, and the cross-sectional area of ​​the open end 1101 is S2, where S1 ≥ 20%S2.

[0076] In this embodiment, if S1 is too small, the wind speed will be too low, and the dust removal effect will not be achieved. Therefore, in this embodiment, by controlling the sum of the cross-sectional areas S1 of the dust removal ports of all the dust removal pipes 120 to be no less than 20% of the cross-sectional area S2 of the opening end 1101, sufficient wind speed can be achieved at the dust removal port to improve the dust removal effect.

[0077] In this embodiment, the dust removal pipe 120 can be a round pipe or a square pipe, and the corresponding dust removal port of the dust removal pipe 120 can be round or square. The structure of the opening end 1101 can also be designed as round or square.

[0078] A simulated welding dust test was conducted on the laser welding dust removal device of this embodiment under the conditions of -450Pa pressure at the dust removal port of dust removal pipe 120 and the release of 500 aluminum powder (dust particles) with a diameter of 0.15mm and an initial velocity of 4m / s from the weld joint. The results were as follows: Figure 4 The dust particle distribution diagram inside the dust collector hood 110 shown is as follows: Figure 5 The diagram shows the linear velocity distribution at the center of the dust collector inlet of the dust collector pipe 120, and as shown below. Figure 6 The image shows the velocity cloud of dust particles inside the laser welding dust removal device.

[0079] from Figure 4It can be seen that for aluminum powder (dust particles) with a diameter of 0.15 mm and an initial velocity of 4 m / s, all dust particles gather orderly towards the dust collection pipe 120, exhibiting good follow-up properties; all dust particles are captured by the dust collection pipe 120, achieving a dust removal efficiency of up to 100%. Most dust particles collide with the inner wall of the cavity 1103 at a relatively small angle (less than 45°), resulting in a lower probability of weld slag adhesion.

[0080] from Figure 5 and Figure 6 It can be seen that the airflow resistance inside the dust collector hood 110 is small. Under the condition of -450Pa, the wind speed at the dust collector outlet can reach about 23m / s. With the increase in overall flow, the risk of aluminum powder (dust particles) settling in the dust collector pipe 120 is low.

[0081] Therefore, through simulation tests, it can be seen that for the laser welding dust removal device of this embodiment, when the negative pressure at the dust removal port is lower than -450Pa, the average wind speed at the dust removal port is not lower than 20m / s; the capture rate of aluminum powder (dust particles) with a diameter of 0.15mm and an initial velocity of 4m / s sputtered from the weld point can reach more than 90%.

[0082] Comparative Example 1

[0083] This comparative example provides a laser welding dust removal mechanism, such as... Figures 7 to 9 As shown, the bottom of the dust removal hood 300 of the laser welding dust removal mechanism is provided with an inner mesh cover 400, and does not contain a conical cavity (conical cover).

[0084] The laser welding dust removal mechanism of this comparative example was subjected to a simulated welding dust test according to the method of Example 1. The test results are as follows: Figures 10 to 12 As shown.

[0085] from Figure 10 It can be seen that for aluminum powder (dust particles) with a diameter of 0.15mm and an initial velocity of 4m / s, among the 500 dust particles released from the welding point, a large number of dust particles escaped outside the dust collector 300, resulting in low dust removal efficiency (estimated to be no more than 50%). Furthermore, the dust particles were relatively disordered inside the dust collector 300 and had poor mobility.

[0086] from Figure 11 and Figure 12 As can be seen, at -450Pa, the wind speed at the opening of the inner mesh cover 400 is relatively high. However, due to the obstruction effect of the inner mesh cover 400, the wind speed at the dust removal port is only about 12M / s, resulting in a low overall flow rate and easy settling of dust particles.

[0087] Comparative Example 2

[0088] like Figures 13 to 15As shown, the dust removal hood 500 of the laser welding dust removal mechanism in this comparative example is a conical structure, and the conical structure is coaxial with the laser beam 600.

[0089] The laser welding dust removal mechanism of this comparative example was subjected to a simulated welding dust test according to the method of Example 1. The test results are as follows: Figures 16 to 18 As shown.

[0090] from Figure 16 It can be seen that for aluminum powder (dust particles) with a diameter of 0.15 mm and an initial velocity of 4 m / s, only a small number of the 500 dust particles released from the welding point escaped outside the dust collector hood 500, indicating a relatively high dust removal efficiency. The dust particles were scattered inside the dust collector hood 500, with generally poor mobility. Many dust particles collided with the inner wall of the dust collector hood 500 at larger angles (45°-90°), increasing the likelihood of adhesion and requiring more frequent cleaning.

[0091] Figure 17 and Figure 18 The results show that at -450Pa, due to the absence of an inner mesh cover, the average wind speed at the dust collection port increases to about 18 m / s, which is higher than that of the first comparative example. However, the speed fluctuations between different dust collection ports and within the same dust collection port are relatively large.

[0092] By comparison, it can be seen that the laser welding dust removal device in this embodiment eliminates the structure design of the inner mesh cover and designs the dust removal cover as a structure composed of multiple conical cavities that narrow towards the dust removal tube. This not only effectively improves the dust particle capture rate, but also allows the dust particles in the dust removal cover to have good mobility, thereby reducing the probability of dust particles adhering to the inner wall of the cavity.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A laser welding dust removal device, characterized in that, The device includes a dust removal structure and a laser welding structure. The dust removal structure includes a dust removal hood and a dust removal pipe. The dust removal pipe is used to connect to an external negative pressure device. The dust removal hood has an opening end and a clearance hole arranged opposite to each other. The laser welding structure can pass through the clearance hole and extend to the opening end. The dust removal hood has a plurality of interconnected conical cavities. The plurality of cavities are distributed around the clearance hole. The cavities are connected to the opening end, and the end of the cavity away from the opening end corresponds to and is connected to the dust removal pipe. The cavity has a first end connected to the dust removal pipe and a second end adjacent to the opening end. The size of the first end is smaller than the size of the second end.

2. The laser welding dust removal device according to claim 1, characterized in that, The first end of the cavity is inclined upward in a direction away from the clearance hole.

3. The laser welding dust removal device according to claim 2, characterized in that, The dust removal pipe is inclined, and the inclination direction of the dust removal pipe is consistent with the inclination direction of the corresponding cavity.

4. The laser welding dust removal device according to claim 3, characterized in that, The laser welding structure is coaxial with the clearance hole, and the angle between the axis of the dust removal pipe and the axis of the clearance hole is α1, where α1 is an acute angle.

5. The laser welding dust removal device according to claim 4, characterized in that, α1 is greater than 15° and less than 90°.

6. The laser welding dust removal device according to claim 1, characterized in that, The dust removal hood includes multiple conical hoods evenly distributed around the laser welding structure. Each conical hood has a cavity. The end of the conical hood away from the opening is connected to the dust removal pipe. The side wall of the conical hood facing the laser welding structure has a groove that communicates with the cavity. Along the circumference of the dust removal hood, the opposite sides of two adjacent conical hoods are sealed together. The grooves of all the conical hoods form the clearance hole.

7. The laser welding dust removal device according to claim 6, characterized in that, The dust collector hood also includes an annular end, which is located at the lower end of the conical hood; the annular end has a third end and a fourth end along its axial direction, the third end is connected to the side of all the conical hoods away from the groove, the fourth end is the opening end, and the plane where the third end is located is inclined relative to the plane where the fourth end is located.

8. The laser welding dust removal device according to claim 7, characterized in that, The laser welding structure includes a laser beam and a welding head. The welding head has a conical channel along its axial direction. The inner diameter of the end of the conical channel adjacent to the opening is smaller than the inner diameter of the end away from the opening. The welding head passes through the clearance hole and extends to the opening. The laser beam can pass through the conical channel to perform welding. The axis of the laser beam is inclined relative to the vertical line.

9. The laser welding dust removal device according to claim 8, characterized in that, The angle between the axis of the laser beam and the vertical line is α2, where α2 is less than 15°, and the angle between the axis of the laser beam and the plane containing the opening end is α3, where α3 = α2 + 90°.

10. The laser welding dust removal device according to any one of claims 1 to 9, characterized in that, The sum of the cross-sectional areas of the dust collection ports of all the dust collection pipes is S1, and the cross-sectional area of ​​the open end is S2, where S1 ≥ 20%S2.

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