A laser welding copper nozzle

Abstract

This invention provides a laser welding copper nozzle, belonging to the technical field of laser welding components. The laser welding copper nozzle includes an installation assembly, a protective sleeve, an inner liner, a dust extraction pipe, and an air inlet connector. In this invention, one end of the dust extraction pipe passes sequentially through the protective sleeve and the inner liner and extends into the first connecting through hole, drawing dust near the opening at the bottom of the outer sleeve. This effectively removes welding fumes and heat, resulting in better performance. The second part of the inner liner forms a ring-shaped first air guiding channel with the inner wall of the protective sleeve. This first air guiding channel can deliver the protective gas supplied by the air inlet connector to the first connecting through hole, resulting in more uniform diffusion of the protective gas and a better oxygen-free welding environment.

Description

Technical Field

[0001] This utility model relates to the field of laser welding component technology, specifically to a laser welding copper nozzle. Background Technology

[0002] Currently, laser welding equipment commonly uses two types of copper nozzle structures. The first type is a copper nozzle with an inner liner and top dust extraction, and the second type is a copper nozzle without an inner liner and near-end dust extraction. For the first type of copper nozzle, see [link to documentation]. Figure 8 The copper nozzle body consists of an inner liner and a protective sleeve, with a protective gas layer for blowing. The dust extraction hood and piping are located above the copper nozzle. However, this type of copper nozzle structure has the following problems: the dust extraction port is far from the dust generation point, making it difficult to remove the large amount of fumes generated during welding in a timely manner, easily leading to poor welding such as incomplete welds and porosity. Weld ash easily accumulates on the inner wall of the copper nozzle, increasing the frequency of cleaning. For the second type of copper nozzle, see... Figure 9 The copper nozzle body is machined from a single piece of brass. Near the lower nozzle opening, there is a dust extraction port. However, this copper nozzle structure has the following problems: the protective gas is blown out through the air passage, resulting in poor diffusion. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the existing technology by proposing a laser welding copper nozzle.

[0004] This utility model proposes a laser welding copper nozzle, including a protective sleeve, an inner liner, a dust extraction pipe, an air inlet connector, and a mounting assembly that can be connected to a laser. The top of the protective sleeve is connected to the bottom of the copper nozzle body. A first connecting through hole is provided through the protective sleeve, and a second connecting through hole is provided through the mounting assembly. A third connecting through hole is provided through the inner liner. A first part of the inner liner is connected to the side wall of the mounting assembly near the second connecting through hole, and a second part extends into the inner side of the first connecting through hole. The third connecting through hole communicates with both the first and second connecting through holes. The first, third, and second connecting through holes form a laser channel. A first annular air guide channel is formed between the second part of the inner liner and the inner side wall of the protective sleeve. One end of the first air guide channel communicates with the first connecting through hole. A fourth connecting through hole is provided on the side of the mounting assembly, communicating with the other end of the first air guide channel. The air inlet connector is connected to the end of the fourth connecting through hole away from the first air guide channel. One end of the dust extraction pipe passes through the protective sleeve and the inner liner in sequence and extends into the first connecting through hole.

[0005] Furthermore, the mounting assembly includes a copper nozzle body, a mounting block detachably connected to the top of the copper nozzle body, the mounting block being connectable to the laser, a protective sleeve connected to the bottom of the copper nozzle body, the second connecting through hole including a first base hole penetrating within the mounting block and a second base hole penetrating within the copper nozzle body, the second base hole communicating with the first connecting through hole, and the fourth connecting through hole being located on the side of the copper nozzle body.

[0006] Furthermore, the inner liner includes a first base, a first connecting portion connected to the top of the first base, and a first blocking portion connected to the bottom of the first base. The third connecting through hole includes a third base hole that penetrates the first blocking portion and a fourth base hole that penetrates the first connecting portion and communicates with the third base hole. The first base is connected to the top of the copper nozzle body. The top of the first connecting portion extends into the first base hole and abuts against the mounting block. The first blocking portion extends into the inner side of the first connecting through hole. The fourth base hole communicates with the first base hole. The third base hole communicates with the first connecting through hole. A first annular air guide channel is formed between the first blocking portion and the inner wall of the protective sleeve.

[0007] Furthermore, the mounting assembly also includes shock absorbers, which are detachably connected to the copper nozzle body and the mounting block, respectively.

[0008] Furthermore, a fifth connecting through hole is provided inside the mounting block, a first fixing hole is provided at the top of the copper nozzle body, and the shock absorber includes a first threaded part, a first spring, and a first stop part connected to the top of the first threaded part. The two ends of the first spring abut against the bottom of the mounting block and the top of the copper nozzle body, respectively. The bottom end of the first threaded part passes through the fifth connecting through hole and the inner side of the first spring in sequence and is threaded into the first fixing hole. The first stop part abuts against the top of the mounting block, and the cross-sectional area of ​​the first stop part is larger than the cross-sectional area of ​​the fifth connecting through hole.

[0009] Furthermore, the mounting assembly also includes a fastener for detachably securing the copper nozzle body and the first base.

[0010] Furthermore, a sixth connecting through hole is provided through the first base, and a second fixing hole is provided at the top of the copper nozzle body. The fixing member includes a second screw part and a second stop part connected to the top of the second screw part. The bottom end of the second screw part passes through the sixth connecting through hole and is screwed to the second fixing hole. The second stop part abuts against the top of the copper nozzle body. The cross-sectional area of ​​the second stop part is larger than the cross-sectional area of ​​the sixth connecting through hole.

[0011] Furthermore, there are multiple fifth connecting through holes arranged symmetrically, multiple first fixing holes are arranged corresponding to the multiple fifth connecting through holes, and multiple shock absorbers are arranged corresponding to the multiple fifth connecting through holes.

[0012] Furthermore, there are multiple sixth connecting through holes arranged symmetrically, multiple second fixing holes are arranged corresponding to the multiple sixth connecting through holes, and multiple fixing members are arranged corresponding to the multiple sixth connecting through holes.

[0013] Furthermore, the protective sleeve is a frustum structure with a cross-sectional area that gradually decreases from top to bottom, and the first enclosure part is a frustum structure that matches the protective sleeve.

[0014] The laser welding copper nozzle of this utility model has the following beneficial effects:

[0015] One end of the dust extraction pipe passes through the protective sleeve and the inner lining in sequence and extends into the first connecting through hole. It extracts dust near the opening at the bottom of the protective sleeve, which can promptly remove the fumes and heat generated during welding, resulting in better performance. The second part of the inner lining forms a ring-shaped first air guide channel with the inner wall of the protective sleeve. The first air guide channel can deliver the protective gas supplied by the air inlet joint to the first connecting through hole, resulting in more uniform diffusion of the protective gas and a better oxygen-free welding environment. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. In these drawings, similar reference numerals are used to denote similar elements. The drawings described below are some embodiments of the present invention, but not all embodiments. Other drawings will be readily available to those skilled in the art based on these drawings without any inventive effort.

[0017] Figure 1 This is a schematic diagram of the structure of a laser welding copper nozzle according to an embodiment of the present invention;

[0018] Figure 2 This is a first side view of a laser welding copper nozzle according to an embodiment of the present invention;

[0019] Figure 3 This is a second side view of a laser welding copper nozzle according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of a laser welding copper nozzle with the mounting block omitted, according to an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the structure of a laser welding copper nozzle according to an embodiment of the present invention, omitting the mounting block, dust extraction pipe, shock absorber, fixing component, and air inlet connector.

[0022] Figure 6 This is a first cross-sectional view of a laser welding copper nozzle according to an embodiment of the present invention;

[0023] Figure 7 This is a second cross-sectional view of a laser welding copper nozzle according to an embodiment of the present invention;

[0024] Figure 8This is a schematic diagram of the structure of the first copper nozzle with an inner liner and dust extraction at the top in the prior art;

[0025] Figure 9 This is a schematic diagram of the structure of the second type of copper nozzle in the prior art, which is without a liner and has a near-end dust extraction nozzle.

[0026] In the diagram: 1-Mounting component, 11-Mounting block, 12-Copper nozzle body, 121-Fourth connecting through hole, 122-First fixing hole, 123-Second fixing hole, 13-Shock absorber, 131-First stop, 132-First screw connection, 133-First spring, 134-Sleeve, 14-Fixing component, 2-Protective sleeve, 21-First connecting through hole, 3-Air inlet connector, 4-Dust extraction pipe, 5-Inner liner, 51-First base, 52-First connecting part, 53-First enclosure part, 54-Third connecting through hole, 6-First air guide channel, 7-Air guide hole. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0028] Please see Figure 1-7 This utility model discloses a laser welding copper nozzle, comprising a protective sleeve 2, an inner liner 5, a dust extraction pipe 4, an air inlet connector 3, and a mounting assembly 1 connectable to a laser. The top of the protective sleeve 2 is connected to the bottom of the copper nozzle body 12. A first connecting through hole 21 is provided through the protective sleeve 2, and a second connecting through hole is provided through the mounting assembly 1. A third connecting through hole 54 is provided through the inner liner 5. A first part of the inner liner 5 is connected to the side wall of the mounting assembly 1 near the second connecting through hole, and a second part extends into the inner side of the first connecting through hole 21. The third connecting through hole 54 is connected to the first connecting through hole 21 and the second connecting through hole 54 respectively. Two connecting through holes are connected, with the first connecting through hole 21, the third connecting through hole 54, and the second connecting through hole forming a laser channel; the second part of the inner liner 5 and the inner side wall of the protective sleeve 2 form a first air guide channel 6 in an annular arrangement, with one end of the first air guide channel 6 connected to the first connecting through hole 21; the side of the mounting component 1 is provided with a fourth connecting through hole 121 connected to the other end of the first air guide channel 6; the air inlet connector 3 is connected to the end of the fourth connecting through hole 121 away from the first air guide channel 6; one end of the dust extraction pipe 4 passes through the protective sleeve 2 and the inner liner 5 in sequence and extends into the first connecting through hole 21.

[0029] Here, the protective sleeve 2 is positioned close to the component to be welded, with its bottom end also close to the component. During welding, fumes are generated inside the protective sleeve 2. One end of the dust extraction pipe 4 passes sequentially through the protective sleeve 2 and the inner lining 5, extending into the first connecting through-hole 21. This close proximity of the dust extraction pipe 4 to the component allows for near-end dust extraction, effectively removing welding fumes and heat. A second part of the inner lining 5 forms a ring-shaped first air guide channel 6 with the inner wall of the protective sleeve 2. The fourth connecting through-hole 121 communicates with the first air guide channel 6. An air inlet connector 3 is connected to the fourth connecting through-hole 121, allowing protective gas to enter the fourth connecting through-hole 121. The fourth connecting through-hole 121 then guides the protective gas into the first air guide channel 6, which in turn guides the protective gas into the first connecting through-hole 21. Compared to the second type of copper nozzle in the prior art, see [link to previous section]. Figure 9 The copper nozzle body 12 is machined from a single piece of brass. Near the lower nozzle opening, there is a dust extraction port. Protective gas is blown out through a single air guide hole 7. The first air guide channel 6 of this application is arranged in a ring shape, which allows more protective gas to enter the first connecting through hole 21 per unit time.

[0030] Specifically, the protective sleeve 2 has a first connecting through hole 21 extending from top to bottom, the mounting component 1 has a second connecting through hole extending from top to bottom, and the inner liner 5 has a third connecting through hole 54 extending from top to bottom. The axes of the first connecting through hole 21, the third connecting through hole 54, and the second connecting through hole coincide. The other end of the dust extraction pipe 4 can be connected to a dust extraction device to remove the smoke and dust generated in the first connecting through hole 21. The other end of the air inlet connector 3 can be connected to a gas supply device that provides protective gas, thereby inputting protective gas into the first air guide channel 6.

[0031] Specifically, the laser welding device is used to weld the connecting plate and the battery cell electrode post. It includes a laser oscillation device, a laser, and the laser welding copper nozzle of this application. The laser is placed between the laser oscillation device and the laser welding copper nozzle of this application. The laser emitted by the laser is aligned with the laser channel. The welding trajectory is set by the laser oscillation device. The laser is then emitted into the laser channel in coordination with the laser to perform laser through welding on the connecting plate and the battery cell electrode post.

[0032] Mounting assembly 1 may include a copper nozzle body 12, a mounting block 11 detachably connected to the top of the copper nozzle body 12, the mounting block 11 being connected to a laser, a protective sleeve 2 being connected to the bottom of the copper nozzle body 12, a second connecting through hole including a first base hole through the mounting block 11 and a second base hole through the copper nozzle body 12, the second base hole communicating with the first connecting through hole 21, and a fourth connecting through hole 121 being provided on the side of the copper nozzle body 12.

[0033] Specifically, the mounting block 11 and the copper nozzle body 12 are arranged vertically, and are detachably connected to facilitate the installation and removal of the mounting block 11 from the copper nozzle body 12, thus facilitating the replacement of the copper nozzle body 12. The mounting block 11 has a first through-hole extending from top to bottom, and the copper nozzle body 12 has a second through-hole extending from top to bottom. The axes of the first and second through-holes coincide.

[0034] The inner liner 5 may include a first base 51, a first connecting part 52 connected to the top of the first base 51, and a first blocking part 53 connected to the bottom of the first base 51. The third connecting through hole 54 includes a third base hole that penetrates the first connecting part 52 and a fourth base hole that penetrates the first blocking part 53 and communicates with the third base hole. The first base 51 is connected to the top of the copper nozzle body 12. The top of the first connecting part 52 extends into the first base hole and abuts against the mounting block 11. The first blocking part 53 extends into the inner side of the first connecting through hole 21. The third base hole communicates with the first base hole, and the fourth base hole communicates with the first connecting through hole 21. A first air guide channel 6 is formed between the first blocking part 53 and the inner wall of the protective sleeve 2.

[0035] Specifically, the bottom of the first base 51 abuts against the top of the copper nozzle body 12, and the first base 51 is fixedly connected to the copper nozzle body 12; the first connecting part 52 can be an annular connecting part, the first blocking part 53 can be an annular blocking part, the first base 51 can be an annular base, the first connecting part 52 is provided with a third base hole through the top to the bottom, the first blocking part 53 is provided with a fourth base hole through the top to the bottom, and the fourth base hole is connected to the third base hole. When the top of the first connecting part 52 extends into the first base hole and abuts against the mounting block 11, and the first blocking part 53 extends into the inside of the first connecting through hole 21, the third base hole is connected to the first base hole, the fourth base hole is connected to the first connecting through hole 21, and the second base hole is connected to the first connecting through hole 21. Thus, the first base hole, the third base hole, the fourth base hole, the second base hole, and the first connecting through hole 21 are connected, thereby realizing that the third connecting through hole 54 is connected to the first connecting through hole 21 and the second connecting through hole respectively.

[0036] Specifically, the axes of the first base hole, the third base hole, the fourth base hole, the second base hole, and the first connecting through hole 21 coincide. The axis of the first base hole coincides with the axis of the mounting block 11. The axis of the second base hole coincides with the axis of the copper nozzle body 12. The axis of the third base hole coincides with the axis of the first connecting part 52. The axis of the fourth base hole coincides with the axis of the first enclosure part 53. The axis of the first connecting part 52 coincides with the axis of the first enclosure part 53. The axis of the first connecting through hole 21 coincides with the axis of the protective sleeve 2.

[0037] Mounting assembly 1 may also include a shock absorber 13, which is detachably connected to the copper nozzle body 12 and the mounting block 11.

[0038] Specifically, the shock absorber 13 can provide shock absorption, so when the mounting block 11 is connected to the laser, the shock absorber 13 can provide shock absorption for the mounting block 11.

[0039] The mounting block 11 has a fifth connecting through hole, and the copper nozzle body 12 has a first fixing hole 122 at the top. The shock absorber 13 includes a first screw part 132, a first spring 133, and a first stop part 131 connected to the top of the first screw part 132. The two ends of the first spring 133 abut against the bottom of the mounting block 11 and the top of the copper nozzle body 12, respectively. The bottom end of the first screw part 132 passes through the fifth connecting through hole and the inside of the first spring 133 and is screwed into the first fixing hole 122. The first stop part 131 abuts against the top of the mounting block 11. The cross-sectional area of ​​the first stop part 131 is larger than the cross-sectional area of ​​the fifth connecting through hole.

[0040] Specifically, the first screwed portion 132 and the first stop portion 131 can be integrally formed. The integrally formed component can use a first screw, meaning the shock absorber 13 can include a first screw and a first spring 133. The mounting block 11 has a fifth connecting through hole extending from top to bottom. The axis of the fifth connecting through hole can be parallel to the axis of the mounting block 11. The axis of the first fixing hole 122 and the axis of the fifth connecting through hole can coincide. The first fixing hole 122 is a threaded hole. The bottom end of the first screwed portion 132 is screwed into the first fixing hole 122, and the middle part of the first screwed portion 132 is inserted into the fifth connecting through hole and the inner side of the first spring 133. The top end of the first spring 133 abuts against the bottom end of the mounting block 11, and the bottom end abuts against the top end of the copper nozzle body 12. The axes of the fifth connecting through hole, the first spring 133, and the first fixing hole 122 coincide.

[0041] Specifically, the shock absorber 13 also includes a sleeve 134, which includes a limiting part and a connecting part connected to the bottom end of the limiting part. The limiting part has a fifth base hole extending from the top to the bottom end, and the connecting part has a sixth base hole extending from the top to the bottom end. The cross-sectional area of ​​the limiting part is larger than the cross-sectional area of ​​the connecting part. The axis of the sixth base hole coincides with the axis of the fifth base hole. The axis of the first spring 133 and the axis of the sixth base hole can coincide. The axis of the first fixing hole 122 can coincide with the axis of the first spring 133. The sixth base hole and the fifth base hole are connected. The cross-sectional area of ​​the first spring 133 is larger than the cross-sectional area of ​​the connecting part and smaller than the cross-sectional area of ​​the limiting part. The cross-sectional area of ​​the limiting part is larger than the cross-sectional area of ​​the fifth connecting through hole. The top end of the limiting part abuts against the bottom end of the mounting block 11, the top end of the first spring 133 abuts against the bottom end of the limiting part, the bottom end of the first spring 133 abuts against the top end of the copper nozzle body 12, the first spring 133 is sleeved on the outer periphery of the sleeve part, and the bottom end of the first screw part 132 passes through the fifth connecting through hole, the fifth base hole, the sixth base hole, and the inner side of the first spring 133 in sequence and is screwed into the first fixing hole 122.

[0042] Mounting assembly 1 may also include a fastener 14 for detachably securing the copper nozzle body 12 and the first base 51.

[0043] The first base 51 may have a sixth connecting through hole, and the top of the copper nozzle body 12 is provided with a second fixing hole 123. The fixing member 14 includes a second screw part and a second stop part connected to the top of the second screw part. The bottom end of the second screw part passes through the sixth connecting through hole and is screwed to the second fixing hole 123. The second stop part abuts against the top of the copper nozzle body 12. The cross-sectional area of ​​the second stop part is larger than the cross-sectional area of ​​the sixth connecting through hole.

[0044] Specifically, the second threaded part and the second stop part can be integrally formed. The component with the second threaded part and the second stop part integrally formed can use a second screw, that is, the fastener 14 can include a second screw.

[0045] The fifth connecting through holes can be multiple symmetrically arranged, the first fixing holes 122 are multiple corresponding to the multiple fifth connecting through holes, and the shock absorbers 13 are multiple corresponding to the multiple fifth connecting through holes.

[0046] Specifically, the fifth connecting through hole can be four holes respectively located near the four corners of the mounting block 11, the first fixing hole 122 can be four holes respectively located near the four corners of the copper nozzle body 12, and the shock absorber 13 can be four.

[0047] The sixth connecting through hole can be multiple symmetrically arranged, the second fixing hole 123 can be multiple corresponding to the multiple sixth connecting through holes, and the fixing member 14 can be multiple corresponding to the multiple sixth connecting through holes.

[0048] Specifically, there can be four sixth connecting through holes, four second fixing holes 123, and four fixing parts 14.

[0049] The protective sleeve 2 can be a frustum structure with a cross-sectional area that gradually decreases from top to bottom, and the first enclosure part 53 is a frustum structure that matches the protective sleeve 2.

[0050] Specifically, the protective sleeve 2 has a frustum structure, and the first enclosure part 53 has a frustum structure that matches the protective sleeve 2. Therefore, the first air guide channel 6 can be an arc-shaped channel to facilitate the flow of protective air. Both the protective sleeve 2 and the first enclosure part 53 can be inverted frustum structures, that is, the cross-sectional area of ​​the top end is larger than the cross-sectional area of ​​the bottom end, and the cross-sectional area gradually decreases.

[0051] Specifically, in this application, one end of the dust extraction pipe 4 extends into the first connecting through hole 21 inside the protective sleeve 2, and the protective sleeve 2 is positioned close to the part to be welded, thus enabling the dust extraction pipe 4 to directly access the welding cavity. This application integrates the inner liner 5 and the dust extraction pipe 4 that directly accesses the welding cavity into one unit, which can significantly optimize the auxiliary welding environment. During the welding process, this application presses the target material to be welded, and the shielding gas blowing and dust extraction functions are activated in advance to create an oxygen-free welding environment. Finally, the laser emits light to complete the welding.

[0052] The above-described contents can be implemented individually or in combination in various ways, and all such variations are within the protection scope of this utility model.

[0053] It should be noted that in the description of this application, the terms "upper end," "lower end," and "bottom end," indicating orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise limited, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A laser welded copper nozzle characterized by: The assembly includes a protective sleeve (2), an inner liner (5), a dust extraction pipe (4), an air inlet connector (3), and a mounting assembly (1) that can be connected to a laser. The top of the protective sleeve (2) is connected to the bottom of the copper nozzle body (12). A first connecting through hole (21) is provided through the protective sleeve (2). A second connecting through hole is provided through the mounting assembly (1). A third connecting through hole (54) is provided through the inner liner (5). The first part of the inner liner (5) is connected to the side wall of the mounting assembly (1) near the second connecting through hole, and the second part extends into the inner side of the first connecting through hole (21). The third connecting through hole (54) is connected to the first connecting through hole (21) and the second connecting through hole respectively. The first connecting through hole (21), the third connecting through hole (54) and the second connecting through hole form a laser channel; the second part of the inner liner (5) and the inner side wall of the protective sleeve (2) form a first air guide channel (6) arranged in an annular manner, one end of the first air guide channel (6) is connected to the first connecting through hole (21), the side of the mounting component (1) is provided with a fourth connecting through hole (121) connected to the other end of the first air guide channel (6), the air inlet connector (3) is connected to the end of the fourth connecting through hole (121) away from the first air guide channel (6); one end of the dust extraction pipe (4) passes through the protective sleeve (2) and the inner liner (5) in sequence and extends into the first connecting through hole (21).

2. A laser welded copper tip as defined in claim 1, characterized in that: The mounting assembly (1) includes a copper nozzle body (12) and a mounting block (11) detachably connected to the top of the copper nozzle body (12). The mounting block (11) can be connected to the laser. The protective sleeve (2) is connected to the bottom of the copper nozzle body (12). The second connecting through hole includes a first base hole that penetrates the mounting block (11) and a second base hole that penetrates the copper nozzle body (12). The second base hole communicates with the first connecting through hole (21). The fourth connecting through hole (121) is located on the side of the copper nozzle body (12).

3. The laser welding copper nozzle as described in claim 2, characterized in that: The inner liner (5) includes a first base (51), a first connecting part (52) connected to the top of the first base (51), and a first enclosure part (53) connected to the bottom of the first base (51). The third connecting through hole (54) includes a third base hole that penetrates the first connecting part (52) and a fourth base hole that penetrates the first enclosure part (53) and communicates with the third base hole. The first base (51) is connected to the top of the copper nozzle body (12). The top of the first connecting part (52) extends into the first base hole and abuts against the mounting block (11). The first enclosure part (53) extends into the inner side of the first connecting through hole (21). The third base hole communicates with the first base hole. The fourth base hole communicates with the first connecting through hole (21). A first air guide channel (6) is formed between the first enclosure part (53) and the inner wall of the protective sleeve (2).

4. A laser welded copper tip as claimed in claim 2 or 3, characterized in that: The mounting assembly (1) also includes a shock absorber (13), which is detachably connected to the copper nozzle body (12) and the mounting block (11).

5. A laser welded copper tip as claimed in claim 4, wherein: The mounting block (11) has a fifth connecting through hole, and the copper nozzle body (12) has a first fixing hole (122) at the top. The shock absorber (13) includes a first screw part (132), a first spring (133), and a first stop part (131) connected to the top of the first screw part (132). The two ends of the first spring (133) abut against the bottom of the mounting block (11) and the top of the copper nozzle body (12), respectively. The bottom end of the first screw part (132) passes through the fifth connecting through hole and the inner side of the first spring (133) and is screwed into the first fixing hole (122). The first stop part (131) abuts against the top of the mounting block (11). The cross-sectional area of ​​the first stop part (131) is larger than the cross-sectional area of ​​the fifth connecting through hole.

6. A laser welded copper tip as defined in claim 3, wherein: The mounting assembly (1) also includes a fastener (14) for detachably fixing the copper nozzle body (12) and the first base (51).

7. A laser welded copper tip as claimed in claim 6, characterized in that: The first base (51) is provided with a sixth connecting through hole, and the copper nozzle body (12) is provided with a second fixing hole (123) at the top. The fixing member (14) includes a second screw part and a second stop part connected to the top of the second screw part. The bottom end of the second screw part passes through the sixth connecting through hole and is screwed to the second fixing hole (123). The second stop part abuts against the top of the copper nozzle body (12). The cross-sectional area of ​​the second stop part is larger than the cross-sectional area of ​​the sixth connecting through hole.

8. A laser welded copper tip as defined in claim 5, wherein: The fifth connecting through holes are a plurality of symmetrically arranged, the first fixing hole (122) is a plurality of corresponding fifth connecting through holes, and the shock absorber (13) is a plurality of corresponding fifth connecting through holes.

9. A laser welding copper nozzle as described in claim 7, characterized in that: The sixth connecting through holes are a plurality of symmetrically arranged, the second fixing holes (123) are a plurality of corresponding to the plurality of sixth connecting through holes, and the fixing members (14) are a plurality of corresponding to the plurality of sixth connecting through holes.

10. A laser welded copper tip as defined in claim 3, wherein: The protective sleeve (2) is a frustum structure with a cross-sectional area that gradually decreases from top to bottom, and the first enclosure part (53) is a frustum structure that matches the protective sleeve (2).

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