A cooling laser cutting head and laser cutting method

Abstract

The present invention belongs to the technical field of laser cutting heads, and particularly relates to a cooling laser cutting head and a laser cutting method, comprising a lens assembly, a nozzle assembly and a cooling assembly; the bottom of the lens assembly is rotatably connected to the nozzle assembly, the cooling assembly is slidably connected to the outer wall of the lens assembly, and the connection between the cooling assembly and the nozzle assembly is meshed and transmitted, and is connected to an optical fiber line through the top of the lens assembly. The optical fiber line is used to transmit laser light to the lens assembly and then change the focus of the laser. The changed laser focus extends to the nozzle assembly. During the rotational connection of the nozzle assembly, the cooling assembly is driven to fall to both ends of the nozzle assembly to cool both ends of the nozzle assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of laser cutting heads, and in particular relates to a cooling laser cutting head and a laser cutting method. Background Art

[0002] Laser cutting is one of the thermal cutting methods. Laser cutting uses a high-energy-density laser beam to heat the workpiece, causing the temperature to rise rapidly and reach the boiling point of the material in a very short time. The material begins to vaporize and form steam. The steam is ejected at a very high speed, and a cut is formed on the material while the steam is ejected. The vaporization heat of the material is generally very large, so laser vaporization cutting requires a lot of power and power density. During the laser cutting process, the laser cutting head has a very high temperature. If it cannot be self-circulated and cooled, it is very easy to cause damage to the product.

[0003] After searching, in the prior art, Chinese patent publication number CN209969875U, authorization announcement date: 2020-01-21, discloses a cooled laser cutting head, including a nozzle and an insulator, a light channel for laser passage is opened at the axis of the nozzle, the nozzle serves as a sensing electrode of a capacitive sensor, and the nozzle is provided with a connector, the insulator is connected to the connector, the nozzle is insulated from the laser frame through the insulator, and a cooling block is provided between the nozzle and the insulator, the cooling block and the nozzle are arranged in contact with each other, and a cooling block is provided on the nozzle serving as a capacitive electrode, and the cooling block is provided in contact with the nozzle. While the cooling block performs heat exchange, the nozzle in contact with the cooling block also performs heat exchange, and the cooling block is provided to offset the temperature increase of the nozzle during operation, and the nozzle serving as a capacitive electrode can maintain a stable temperature to ensure that the distance between the nozzle and the plate remains stable, so that the cutting effect is smooth and uniform.

[0004] However, the device still has the following defects: although it can maintain a stable temperature to ensure that the distance between the nozzle and the plate remains stable, so that the cutting effect is smooth and uniform, a cooling block is set to offset the temperature increase of the nozzle during operation. The cooling process of the nozzle needs to be continued, and the physical isolation effect of the insulating block is not ideal. Therefore, a laser cutting head with self-switching nozzle cooling is needed. Summary of the invention

[0005] In view of the above problems, the present invention provides a cooling laser cutting head, comprising a lens assembly, a nozzle assembly and a cooling assembly; the bottom of the lens assembly is rotatably connected to the nozzle assembly, the cooling assembly is slidably connected to the outer wall of the lens assembly, and the connection between the cooling assembly and the nozzle assembly is meshed and transmitted;

[0006] The top of the lens assembly is connected to the optical fiber line, and the optical fiber line is used to transmit the laser to the lens assembly to change the focus of the laser. The changed laser focus extends to the nozzle assembly. During the rotation and connection of the nozzle assembly, the cooling assembly is driven to fall to both ends of the nozzle assembly to cool both ends of the nozzle assembly.

[0007] Furthermore, the lens assembly includes a lens housing; the lens housing is a rectangular structure, an inner wall of the lens housing is provided with an inner cavity, and the inner cavity extends to both ends of the lens housing, and an assembly seat is provided at the bottom of the lens housing.

[0008] Furthermore, an optical fiber mounting seat is provided on the top of the lens housing, and the optical fiber mounting seat is communicated with the inner cavity, and an upper protective lens, a collimating lens group, a focusing lens group, a middle protective lens and a lower protective lens are sequentially embedded and installed on one side wall of the lens housing, the upper protective lens is located on a side close to the optical fiber mounting seat, and the lower protective lens is located on a side close to the assembly seat.

[0009] Furthermore, the nozzle assembly includes a right-angle bend pipe; a first nozzle inlet is provided on the outer wall of the right-angle bend pipe and on one side close to the corner, a second nozzle inlet is provided on the outer wall of the right-angle bend pipe and on the other side close to the corner, and a first ceramic ring is clamped at the port of the right-angle bend pipe and on one side close to the second nozzle inlet.

[0010] Furthermore, a first nozzle is provided at the bottom of the first ceramic ring, a second ceramic ring is clamped at the port of the right-angle bend pipe and on one side close to the inlet of the first nozzle, a second nozzle is provided on one side wall of the second ceramic ring, and shaft pins are fixedly connected to the outer wall of the right-angle bend pipe and on both sides close to the corner, the two groups of shaft pins are arranged with the central axis of the right-angle bend pipe as the center, and the ends of the two groups of shaft pins are embedded and installed with a first micro motor, the output ends of the first micro motor are transmission-connected with gears, and the two groups of shaft pins are rotatably connected in the assembly seat.

[0011] Furthermore, the cooling assembly includes a guide frame; the cross-section of the guide frame is a U-shaped structure, and a leveling plate is fixedly connected to one side of the inner wall of the guide frame, the leveling plate and the guide frame are movably fitted and connected to the outer wall of the lens housing, the leveling plate and the bottom of the guide frame are fixedly connected to racks, and two groups of the racks are meshingly connected to gears, both sides of the outer wall of the guide frame are fixedly connected to first cylinders, and the output ends of the two groups of the first cylinders are transmission-connected to a fitting mechanism.

[0012] Furthermore, the fitting mechanism includes a sleeve frame; second cylinders are fixedly connected to both sides of the outer wall of the sleeve frame, and the output ends of two groups of the second cylinders extend into the sleeve frame and are transmission-connected to the inner sleeves, and the two groups of the inner sleeves are spliced ​​into an annular structure.

[0013] Furthermore, a through hole is provided on one side wall of the jacket frame, and the two groups of inner jackets are symmetrically arranged with the central axis of the through hole as the center, a reinforcement plate is also provided on the top of the jacket frame, and the other side wall of the reinforcement plate is fixedly connected to the outer wall of the guide frame, a third cylinder is fixedly connected to the top of the jacket frame, and the output end of the third cylinder is transmission-connected to a second micro motor.

[0014] Furthermore, three groups of clip-on brackets are fixedly connected to the output end of the second micromotor, and several groups of clip-on brackets are arranged in a circular array with the central axis of the second micromotor as the center, and negative pressure pumps, air pumps and cold air tanks are respectively arranged in several groups of the clip-on brackets, and the top of the sheath frame is transmission-connected to the output end of the first cylinder.

[0015] A cutting method for cooling a laser cutting head comprises the following steps:

[0016] The top of the lens assembly is connected to the optical fiber line, and the optical fiber line is used to transmit the laser to the lens assembly to change the focus of the laser;

[0017] The altered laser focus extends into the nozzle assembly;

[0018] During the rotational connection of the nozzle assembly, the cooling assembly is driven to fall to both ends of the nozzle assembly to cool the two ends of the nozzle assembly.

[0019] The beneficial effects of the present invention are:

[0020] 1. Connect the top of the lens assembly to the optical fiber line, use the optical fiber line to transmit the laser to the lens assembly and then change the focus of the laser. The changed laser focus extends to the nozzle assembly. During the rotation and connection of the nozzle assembly, the cooling assembly is driven to fall to both ends of the nozzle assembly to cool both ends of the nozzle assembly.

[0021] 2. By rotating the gear to one side, the rack meshing with the gear is raised and lowered, driving the guide frame to slide and connect to the outer wall of the lens housing at different heights. The leveling plate is always connected to the upper protective lens, collimating lens group, focusing lens group, middle protective lens and one end of the lower protective lens to detect whether the lens is loose and detached from the lens housing, thereby improving the structural stability of the laser cutting head during frequent switching and adjustment.

[0022] 3. The output end of the second cylinder on one side is used to drive the inner sleeve to be spliced ​​to form an annular structure, which is used to be sleeved on the first nozzle inlet or the second nozzle inlet, so that the first nozzle inlet or the second nozzle inlet can be connected with the through hole to improve the sealing performance.

[0023] 4. The second micro motor is used to rotate the sheath frame on one side to drive the cold air tank to move to the port close to the through hole, and the third cylinder is used to pull the cold air tank close to the through hole, so that the port of the cold air tank is squeezed and the cold air passes through the through hole and is injected into the first nozzle or the second nozzle, so that the first nozzle or the second nozzle is quickly cooled under stress, thereby improving the efficiency of rapid cooling of the two sets of nozzles after switching.

[0024] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of a cooling laser cutting head according to an embodiment of the present invention is shown;

[0027] Figure 2 A schematic structural diagram of a lens assembly according to an embodiment of the present invention is shown;

[0028] Figure 3 A schematic structural diagram of a nozzle assembly according to an embodiment of the present invention is shown;

[0029] Figure 4 A schematic diagram of an exploded structure of a nozzle assembly according to an embodiment of the present invention is shown;

[0030] Figure 5 A schematic diagram of the structure of a cooling assembly according to an embodiment of the present invention is shown;

[0031] Figure 6 The structure of the bonding mechanism of the embodiment of the present invention is shown Figure 1 ;

[0032] Figure 7 The structure of the bonding mechanism of the embodiment of the present invention is shown Figure 2 ;

[0033] Figure 8 A schematic diagram showing the connection between the laminating mechanism and the nozzle assembly according to an embodiment of the present invention is shown.

[0034] In the figure: 1. lens assembly; 11. lens housing; 12. inner cavity; 13. assembly seat; 14. optical fiber cable mounting seat; 15. upper protective lens; 16. collimating lens group; 17. focusing lens group; 18. middle protective lens; 19. lower protective lens; 2. nozzle assembly; 21. right angle elbow; 22. first nozzle inlet; 23. second nozzle inlet; 24. first ceramic ring; 25. first nozzle; 26. second ceramic ring; 27. second nozzle; 28. Axis pin; 29, first micro motor; 210, gear; 3, cooling assembly; 31, guide frame; 32, leveling plate; 33, rack; 34, fitting mechanism; 341, sheath frame; 342, second cylinder; 343, inner sheath; 344, through hole; 345, reinforcement plate; 346, third cylinder; 347, second micro motor; 348, snap-on bracket; 349, negative pressure pump; 3410, air pump; 3411, cold air tank; 35, first cylinder. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The embodiment of the present invention provides a cooling laser cutting head, including a lens assembly 1, a nozzle assembly 2 and a cooling assembly 3; illustratively, as Figure 1 shown.

[0037] The bottom of the lens assembly 1 is rotatably connected to the nozzle assembly 2, the cooling assembly 3 is slidably connected to the outer wall of the lens assembly 1, and the connection between the cooling assembly 3 and the nozzle assembly 2 is meshed and transmitted.

[0038] Specifically, the top of the lens assembly 1 is connected to the optical fiber line, and the optical fiber line is used to transmit the laser to the lens assembly 1 and then change the focus of the laser. The changed laser focus extends to the nozzle assembly 2. During the rotation connection of the nozzle assembly 2, the cooling assembly 3 is driven to fall to the two ends of the nozzle assembly 2 for cooling the two ends of the nozzle assembly 2.

[0039] The lens assembly 1 includes a lens housing 11; illustratively, Figure 2 shown.

[0040] The lens housing 11 is a rectangular structure, the inner wall of the lens housing 11 is provided with an inner cavity 12, and the inner cavity 12 extends to both ends of the lens housing 11, the bottom of the lens housing 11 is provided with an assembly seat 13, the top of the lens housing 11 is provided with an optical fiber mounting seat 14, and the optical fiber mounting seat 14 is communicated with the inner cavity 12, and an upper protective lens 15, a collimating lens group 16, a focusing lens group 17, a middle protective lens 18 and a lower protective lens 19 are sequentially embedded and installed on one side wall of the lens housing 11, the upper protective lens 15 is located on the side close to the optical fiber mounting seat 14, and the lower protective lens 19 is located on the side close to the assembly seat 13.

[0041] Specifically, the optical fiber mounting seat 14 is connected to the optical fiber, so that the optical core in the optical fiber serves as a medium for laser transmission. The laser passes through the upper protective lens 15 in turn. The upper protective lens 15 prevents dust from entering the interior of the cutting head and plays a role in protecting the collimating lens. The laser then passes through the collimating lens group 16. The collimating lens group 16 has a concave surface to produce refraction. When the laser passes through the collimating lens, the laser will be amplified. Most cutting heads use an internal motor to move the position of the collimating lens group up and down to change the focus. The laser then passes through the focusing lens group 17, and the focusing lens group 17 gathers the laser. A small number of cutting heads change the focus through the focusing lens group. The laser then passes through the middle protective lens 18, wherein the protective lens 18 protects the focusing lens and plays a sealing role. The laser then passes through the lower protective lens 19, and the lower protective lens 19 prevents iron slag from being reflected upward during perforation and cutting, and isolates the cutting gas.

[0042] The nozzle assembly 2 includes a right-angle elbow 21; illustratively, as Figure 3 and Figure 4 shown.

[0043] A first nozzle inlet 22 is provided on the outer wall of the right-angle bend 21 and on one side close to the corner, a second nozzle inlet 23 is provided on the outer wall of the right-angle bend 21 and on the other side close to the corner, a first ceramic ring 24 is clamped on the port of the right-angle bend 21 and on one side close to the second nozzle inlet 23, a first nozzle 25 is provided at the bottom of the first ceramic ring 24, a second ceramic ring 26 is clamped on the port of the right-angle bend 21 and on one side close to the first nozzle inlet 22, a second nozzle 27 is provided on one side wall of the second ceramic ring 26, shaft pins 28 are fixedly connected on both sides of the outer wall of the right-angle bend 21 and close to the corner, two groups of the shaft pins 28 are arranged with the central axis of the right-angle bend 21 as the center, and the ends of the two groups of the shaft pins 28 are embedded with first micro motors 29, the output ends of the first micro motors 29 are transmission-connected with gears 210, and the two groups of the shaft pins 28 are rotatably connected in the assembly seat 13.

[0044] Specifically, the right-angle elbow 21 is rotatably connected to the inside of the assembly seat 13 through two sets of pivot pins 28. When the first nozzle inlet 22 opened on the outer wall of the right-angle elbow 21 communicates with the inner cavity 12, the laser penetrates through the first nozzle inlet 22, the first ceramic ring 24, and the first nozzle 25 for the use of a set of nozzles, while the second nozzle 27 can be used in cooperation with the cooling assembly 3 for cooling operations. When the right-angle elbow 21 is rotatably connected to the inside of the assembly seat 13 through two sets of pivot pins 28 on the other side, the second nozzle inlet 23 communicates with the inner cavity 12, enabling the laser to penetrate through the second nozzle inlet 23, the second ceramic ring 26, and the second nozzle 27, while the first nozzle 25 can be used in cooperation with the cooling assembly 3 for cooling operations.

[0045] The cooling assembly 3 includes a guiding frame 31;示例性, as Figure 5 shown.

[0046] The cross-section of the guiding frame 31 is a U-shaped structure, and a flattening plate 32 is fixedly connected to one side of the inner wall of the guiding frame 31. The flattening plate 32 and the guiding frame 31 are both movably attached to the outer wall of the lens housing 11. The bottom of the flattening plate 32 and the guiding frame 31 are both fixedly connected with racks 33, and the two racks 33 are both meshed with a gear 210. Both sides of the outer wall of the guiding frame 31 are fixedly connected with first cylinders 35, and the output ends of the two first cylinders 35 are both drivingly connected with a fitting mechanism 34.

[0047] The fitting mechanism 34 includes a sheath frame 341;示例性, as Figure 6 、 Figure 7 and Figure 8 shown.

[0048] Both sides of the outer wall of the sheath frame 341 are fixedly connected with second cylinders 342. The output ends of the two second cylinders 342 extend into the sheath frame 341 and are drivingly connected with inner sheaths 343. The two inner sheaths 343 are a spliced annular structure. A through hole 344 is opened on one side wall of the sheath frame 341, and the two inner sheaths 343 are symmetrically arranged with the central axis of the through hole 344 as the center. A reinforcing plate 345 is further provided on the top of the sheath frame 341, and the other side wall of the reinforcing plate 345 is fixedly connected with the outer wall of the guiding frame 31. A third cylinder 346 is fixedly connected to the top of the sheath frame 341, and the output end of the third cylinder 346 is drivingly connected with a second micro motor 347. The output end of the second micro motor 347 is fixedly connected with three sets of clamping brackets 348, and several sets of clamping brackets 348 are arranged in a circular array with the central axis of the second micro motor 347 as the center. A negative pressure pump 349, an air pump 3410, and a cold air tank 3411 are respectively arranged in several sets of clamping brackets 348. The top of the sheath frame 341 is drivingly connected with the output end of the first cylinder 35.

[0049] Specifically, when the gear 210 rotates to one side, the rack 33 meshing with the gear 210 is lifted and lowered, driving the guide frame 31 to be slidably connected to the outer wall of the lens housing 11 at different heights, and the screed plate 32 is always connected to one end of the upper protective lens 15, the collimating lens group 16, the focusing lens group 17, the middle protective lens 18 and the lower protective lens 19 to detect whether the lens is loose and detached from the lens housing 11, and the first cylinder 35 is used to drive the two sets of sheath frames 341 to fall, so that the two sets of sheath frames 341 are clamped at the port of the first nozzle 25 and the first nozzle inlet 22, or at the port of the second nozzle 27 and the second nozzle inlet 23, so as to perform a sleeve connection function before cooling the first nozzle 25 or the second nozzle 27 when not in operation;

[0050] The output end of the second cylinder 342 on one side is used to drive the inner sleeve 343 to be spliced ​​to form an annular structure, which is used to be sleeved on the first nozzle inlet 22 or the second nozzle inlet 23, so that the first nozzle inlet 22 or the second nozzle inlet 23 can be connected with the through hole 344 to improve the sealing performance;

[0051] The sheath frame 341 on the other side is sleeved on the first nozzle 25 or the second nozzle 27, so that the port of the first nozzle 25 or the second nozzle 27 is connected with the through hole 344;

[0052] The sheath frame 341 on one side is rotated by the second micro motor 347 to drive the cold air tank 3411 to move to the port near the through hole 344, and the third cylinder 346 is used to pull the cold air tank 3411 close to the through hole 344, so that the port of the cold air tank 3411 is squeezed by force and the cold air is injected into the first nozzle 25 or the second nozzle 27 through the through hole 344, so as to quickly cool the first nozzle 25 or the second nozzle 27 under the force state;

[0053] The sheath frame 341 on one side is rotated by the second micro motor 347 to drive the negative pressure pump 349 to move to the port of the first nozzle 25 or the second nozzle 27, while the sheath frame 341 on the other side is rotated by the second micro motor 347 to drive the air pump 3410 to move to the first nozzle inlet 22 or the second nozzle inlet 23. When the first nozzle 25 is connected to the first nozzle inlet 22 at the same level, the negative pressure pump 349 and the air pump 3410 are started at the same time, and the air pump 3410 injects gas into the first nozzle inlet 22, while the negative pressure pump 349 adsorbs and cleans impurities near the port of the first nozzle inlet 22, so as to accelerate the rapid cleaning of the first nozzle 25 during each cooling process and maintain the first nozzle 25 in the best working state.

[0054] The working principle of a cooling laser cutting head proposed by an embodiment of the present invention is as follows:

[0055] When the gear 210 rotates to one side, the rack 33 meshing with the gear 210 is lifted and lowered, driving the guide frame 31 to be slidably connected to the outer wall of the lens housing 11 at different heights. The screed plate 32 is always connected to one end of the upper protective lens 15, the collimating lens group 16, the focusing lens group 17, the middle protective lens 18 and the lower protective lens 19 to detect whether the lens is loose and separated from the lens housing 11. The first cylinder 35 is used to drive the two sets of sheath frames 341 to fall, so that the two sets of sheath frames 341 are clamped at the port of the first nozzle 25 and the first nozzle inlet 22, or at the port of the second nozzle 27 and the second nozzle inlet 23, so as to perform a sleeve connection function before cooling the first nozzle 25 or the second nozzle 27 when not in operation.

[0056] The output end of the second cylinder 342 on one side is used to drive the inner sleeve 343 to be spliced ​​to form an annular structure, which is used to be sleeved on the first nozzle inlet 22 or the second nozzle inlet 23, so that the first nozzle inlet 22 or the second nozzle inlet 23 can be connected with the through hole 344 to improve the sealing performance;

[0057] The other side of the sheath frame 341 is sleeved on the first nozzle 25 or the second nozzle 27, so that the port of the first nozzle 25 or the second nozzle 27 is connected with the through hole 344;

[0058] The sheath frame 341 on one side is rotated by the second micro motor 347 to drive the cold air tank 3411 to move to the port near the through hole 344, and the third cylinder 346 is used to pull the cold air tank 3411 close to the through hole 344, so that the port of the cold air tank 3411 is squeezed by force and the cold air is injected into the first nozzle 25 or the second nozzle 27 through the through hole 344, so as to quickly cool the first nozzle 25 or the second nozzle 27 under the force state;

[0059] The sheath frame 341 on one side is rotated by the second micro motor 347 to drive the negative pressure pump 349 to move to the port of the first nozzle 25 or the second nozzle 27, while the sheath frame 341 on the other side is rotated by the second micro motor 347 to drive the air pump 3410 to move to the first nozzle inlet 22 or the second nozzle inlet 23. When the first nozzle 25 is connected to the first nozzle inlet 22 at the same level, the negative pressure pump 349 and the air pump 3410 are started at the same time, and the air pump 3410 injects gas into the first nozzle inlet 22, while the negative pressure pump 349 adsorbs and cleans impurities near the port of the first nozzle inlet 22, so as to accelerate the rapid cleaning of the first nozzle 25 during each cooling process and maintain the first nozzle 25 in the best working state.

[0060] Based on the above-mentioned cooling laser cutting head, an embodiment of the present invention further provides a cutting method for cooling the laser cutting head, comprising the following steps:

[0061] The top of the lens assembly is connected to the optical fiber line, and the optical fiber line is used to transmit the laser to the lens assembly to change the focus of the laser;

[0062] The altered laser focus extends into the nozzle assembly;

[0063] During the rotational connection of the nozzle assembly, the cooling assembly is driven to fall to both ends of the nozzle assembly to cool the two ends of the nozzle assembly.

[0064] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling laser cutting head, characterized in that: It comprises a lens assembly (1), a nozzle assembly (2) and a cooling assembly (3); the bottom of the lens assembly (1) is rotatably connected to the nozzle assembly (2), the cooling assembly (3) is slidably connected to the outer wall of the lens assembly (1), and the connection between the cooling assembly (3) and the nozzle assembly (2) is meshed and transmitted; The top of the lens assembly (1) is connected to an optical fiber line, and the optical fiber line is used to transmit laser light to the lens assembly (1) to change the focus of the laser light, and the changed laser focus extends to the nozzle assembly (2). During the process of the nozzle assembly (2) rotating and connecting, the cooling assembly (3) is driven to fall to both ends of the nozzle assembly (2), so as to cool the two ends of the nozzle assembly (2); The nozzle assembly (2) comprises a right-angle elbow (21); a first nozzle inlet (22) is provided on one side of the outer wall of the right-angle elbow (21) close to the corner, a second nozzle inlet (23) is provided on the other side of the outer wall of the right-angle elbow (21) close to the corner, and a first ceramic ring (24) is clamped at the end of the right-angle elbow (21) close to the second nozzle inlet (23); A first nozzle (25) is provided at the bottom of the first ceramic ring (24); a second ceramic ring (26) is clamped at the port of the right-angled bend tube (21) and on one side close to the first nozzle inlet (22); a second nozzle (27) is provided on one side wall of the second ceramic ring (26); shaft pins (28) are fixedly connected to the outer wall of the right-angled bend tube (21) and on both sides close to the corner; two groups of shaft pins (28) are arranged with the central axis of the right-angled bend tube (21) as the center; first micro motors (29) are embedded and installed at the ends of the two groups of shaft pins (28); output ends of the first micro motors (29) are transmission-connected to gears (210); and the two groups of shaft pins (28) are rotatably connected in the assembly seat (13); The cooling assembly (3) comprises a guide frame (31); the cross section of the guide frame (31) is a U-shaped structure, and a leveling plate (32) is fixedly connected to one side of the inner wall of the guide frame (31); the leveling plate (32) and the guide frame (31) are both movably connected to the outer wall of the lens housing (11); the bottoms of the leveling plate (32) and the guide frame (31) are both fixedly connected to racks (33), and two groups of the racks (33) are meshingly connected to the gear (210); first cylinders (35) are fixedly connected to both sides of the outer wall of the guide frame (31), and the output ends of the two groups of the first cylinders (35) are both drivingly connected to the fitting mechanism (34); The laminating mechanism (34) comprises a jacket frame (341); second cylinders (342) are fixedly connected to both sides of the outer wall of the jacket frame (341); output ends of two groups of the second cylinders (342) extend into the jacket frame (341) and are drivingly connected to inner jackets (343); the two groups of the inner jackets (343) are spliced ​​into an annular structure.

2. The cooling laser cutting head according to claim 1, characterized in that: The lens assembly (1) comprises a lens housing (11); the lens housing (11) is a rectangular structure; an inner cavity (12) is provided on the inner wall of the lens housing (11), and the inner cavity (12) extends to both ends of the lens housing (11); and an assembly seat (13) is provided at the bottom of the lens housing (11).

3. The cooling laser cutting head according to claim 2, characterized in that: An optical fiber mounting seat (14) is arranged on the top of the lens housing (11), and the optical fiber mounting seat (14) is communicated with the inner cavity (12). An upper protective lens (15), a collimating lens group (16), a focusing lens group (17), a middle protective lens (18) and a lower protective lens (19) are sequentially embedded and mounted on a side wall of the lens housing (11), wherein the upper protective lens (15) is located on a side close to the optical fiber mounting seat (14), and the lower protective lens (19) is located on a side close to the assembly seat (13).

4. The cooling laser cutting head according to claim 1, characterized in that: A through hole (344) is provided on one side wall of the jacket frame (341), and the two groups of inner jackets (343) are symmetrically arranged with the central axis of the through hole (344) as the center. A reinforcing plate (345) is also provided on the top of the jacket frame (341), and the other side wall of the reinforcing plate (345) is fixedly connected to the outer wall of the guide frame (31). A third cylinder (346) is fixedly connected to the top of the jacket frame (341), and the output end of the third cylinder (346) is transmission-connected to a second micro motor (347).

5. The cooling laser cutting head according to claim 4, characterized in that: The output end of the second micro motor (347) is fixedly connected to three groups of clamping brackets (348), and several groups of clamping brackets (348) are arranged in a circular array with the central axis of the second micro motor (347) as the center. A negative pressure pump (349), an air pump (3410) and a cold air tank (3411) are respectively arranged in the several groups of the clamping brackets (348), and the top of the sheath frame (341) is drivingly connected to the output end of the first cylinder (35).

6. A cutting method for cooling a laser cutting head according to any one of claims 1 to 5, characterized in that: The cutting method comprises: The top of the lens assembly is connected to the optical fiber line, and the optical fiber line is used to transmit the laser to the lens assembly to change the focus of the laser; The altered laser focus extends into the nozzle assembly; During the rotational connection of the nozzle assembly, the cooling assembly is driven to fall to both ends of the nozzle assembly to cool the two ends of the nozzle assembly.

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