Improved three-dimensional cutting head

Abstract

The utility model discloses an improved three-dimensional cutting head, which comprises an anti-collision assembly (31), a gas circuit leading-in piece (32), a focusing lens, a focusing lens seat (170), a conical barrel (34) and a cutting nozzle (5), and is characterized in that an annular connecting plate (33) is arranged between the focusing lens seat (170) and the conical barrel (34); the end portion of the conical barrel (34) is embedded into the annular connecting plate (33), and an adjusting brake screw (333) arranged on the annular connecting plate (33) can adjust the relative position of the conical barrel (34) and the focus lens base (170) in the radial direction of the annular connecting plate (33). According to the improved three-dimensional laser cutting head provided by the utility model, the annular connecting plate is additionally arranged between the focus lens seat and the conical barrel, so that the relative positions of the focus lens seat and the conical barrel in the radial direction can be finely adjusted, the accumulated error of each part of the three-dimensional laser cutting head can be corrected, and the focus lens and the cutting nozzle can be accurately coaxial.

Description

Technical Field

[0001] The utility model relates to the technical field of laser processing equipment, and particularly to an improved three-dimensional cutting head. Background Art

[0002] The three-dimensional laser cutting head in the prior art is formed by rigidly connecting and assembling multiple processing parts such as an anti-collision component, an air path inlet part, a focusing lens, a focusing lens seat, a conical cylinder and a cutting nozzle. Due to certain accumulated machining tolerances of the assembled parts, the focusing lens and the cutting nozzle cannot be accurately coaxially arranged, resulting in interference between the laser beam converged by the focusing lens and the cutting nozzle, and part or all of the laser beam irradiating the inner wall of the cutting nozzle and unable to be normally output.

[0003] To solve this problem, in the prior art, generally, the aperture of the small hole at the end of the cutting nozzle is appropriately enlarged to accommodate the radial error after the connection of the cutting nozzle and the focusing lens seat, so that the laser beam with a slightly deviated transmission direction can also be completely output from the cutting nozzle. When the diameter of the small hole at the end of the cutting nozzle in the prior art is at least 2.5 mm, it can be ensured that the laser beam can be completely output from the cutting nozzle. However, enlarging the aperture of the cutting nozzle will increase the production cost. Because during the laser cutting process, when the cutting head outputs laser, compressed air with a certain pressure will be output coaxially to blow away the cutting slag. In order to ensure that the air pressure at the cutting nozzle remains unchanged, when the aperture of the cutting nozzle becomes larger, it is necessary to increase the output of compressed air, which will lead to an increase in the consumption of compressed air and an increase in the production cost. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an improved three-dimensional cutting head aiming at the problems existing in the prior art.

[0005] The purpose of the utility model is solved by the following technical solutions:

[0006] An improved three-dimensional cutting head includes an anti-collision component, an air path inlet part, a focusing lens, a focusing lens seat, a conical cylinder and a cutting nozzle. It is characterized in that: an annular connecting plate is arranged between the focusing lens seat and the conical cylinder, the end of the conical cylinder is embedded in the annular connecting plate, and the adjusting brake screws arranged on the annular connecting plate can adjust the relative positions of the conical cylinder and the focusing lens seat along the radial direction of the annular connecting plate.

[0007] One end face of the annular connecting plate is an annular plane, and the other end face has an inner sunken annular groove. The annular plane end face of the annular connecting plate is coaxially connected with the focusing lens seat, and the annular groove is used to accommodate the end of the conical cylinder; an even number of two-by-two opposite threaded through holes are equidistantly arranged on the circumference of the annular connecting plate corresponding to the annular groove, and corresponding adjusting brake screws are threadedly connected in the threaded through holes.

[0008] The annular connecting plate is provided with a positioning pin hole, and a positioning pin is correspondingly arranged on the corresponding end face of the focusing lens seat to correspond to the positioning pin hole for positioning connection between the focusing lens seat and the annular connecting plate.

[0009] The conical cylinder is a hollow conical structure. There is a circular boss on the outer side of the upper end of the conical cylinder. An even number of pairwise opposite adjusting grooves are equidistantly arranged on the circumference of the circular boss, and the front end of the adjusting brake screw abuts against the bottom surface of the corresponding adjusting groove.

[0010] An auxiliary plate is arranged in the adjusting groove, and the front end of the adjusting brake screw abuts against the corresponding auxiliary plate.

[0011] The auxiliary plate is made of stainless steel material.

[0012] A clearance fit is provided between the inner side wall of the annular groove of the annular connecting plate and the outer wall of the end of the embedded conical cylinder, and the unilateral clearance width is 0.3 mm to 0.5 mm.

[0013] A sealing groove capable of partially accommodating a sealing ring is provided at a position close to the central through hole in the annular groove, and a high-pressure sealing ring is arranged in the sealing groove.

[0014] The aperture of the small hole at the end of the cutting nozzle is not greater than 2.0 mm.

[0015] The steps of performing focusing optical path adjustment using the improved three-dimensional cutting head provided by the present utility model are as follows:

[0016] S1: Pre-assemble the conical cylinder below the focusing lens seat through the annular connecting plate, and fixedly connect the lower port of the conical cylinder to the cutting nozzle;

[0017] S2: Paste a layer of transparent tape on the light outlet of the cutting nozzle, and then control the A laser to output a laser beam. The laser beam is reflected by the A1 mirror, A2 mirror, A3 mirror, A4 mirror, A5 mirror and A6 mirror in sequence and then enters the focusing lens in the laser cutting head. After being focused by the focusing lens, it is output from the light outlet at the end of the cutting nozzle, and an ablation round hole is formed on the transparent tape at the light outlet.

[0018] S3: Tear off the transparent tape with the ablation round hole formed in step S2 from the cutting nozzle. A circular light outlet sticking mark and an ablation round hole will be left on the transparent tape. Use an electron microscope to detect whether the circular contour of the light outlet and the ablation round hole are concentric. The detection method is as follows: Uniformly select a plurality of measurement points on the circumference of the ablation round hole, and use an electron microscope to detect the distance from each measurement point to the inner side of the light outlet contour.

[0019] S4: When the distances Dmax and Dmin from the four measurement points on the ablation round hole to the inner side of the light outlet contour simultaneously satisfy: Dmin ≥ 0.5 mm and Dmax - Dmin ≤ 0.5 mm, the ablation round hole is concentric with the light outlet contour. Fix the conical cylinder pre-installed below the focusing lens holder at this position to complete the fixed connection between the focusing lens holder and the conical cylinder, and complete the focusing optical path adjustment. If the distances Dmax and Dmin from the four measurement points on the ablation round hole to the inner side of the light outlet contour do not satisfy any one of Dmin ≥ 0.5 mm and Dmax - Dmin ≤ 0.5 mm, it indicates that the ablation round hole is not concentric with the light outlet contour, and proceed to step S5;

[0020] S5. Use the measurement data in step S3 to determine the deviation direction of the conical cylinder relative to the focusing lens holder. After finely adjusting the relative position of the conical cylinder and the focusing lens holder in the radial direction through the adjustment and braking screws on the annular connecting plate, return to step S2.

[0021] The utility model has the following advantages compared with the prior art:

[0022] The improved three-dimensional laser cutting head provided by the utility model adds a new annular connecting plate between the focusing lens holder and the conical cylinder, enabling fine adjustment of the relative position of the focusing lens holder and the conical cylinder in the radial direction to correct the cumulative error of each component of the three-dimensional laser cutting head, and enabling the focusing lens and the cutting nozzle to be accurately coaxial.

[0023] For the improved three-dimensional laser cutting head provided by the utility model, when the aperture of the end small hole of the cutting nozzle is reduced to 2.0 mm, it can still ensure the accurate output of the laser beam without interference with the cutting nozzle. The aperture of the end small hole of the original cutting nozzle is reduced from 2.5 mm to 2.0 mm, and the cross-sectional area of the cutting nozzle outlet is reduced by 36%. Without changing the air pressure of the compressed air at the cutting nozzle, the consumption of compressed air is reduced by 36%, effectively reducing the production cost. Description of the Drawings

[0024] Att Figure 1 is the front view of the improved three-dimensional cutting head provided by the utility model;

[0025] Att Figure 2 is the exploded view of the improved three-dimensional cutting head provided by the utility model.

[0026] Wherein: 31 - anti-collision component; 32 - gas path inlet part; 33 - annular connecting plate; 331 - annular groove; 332 - threaded through hole; 333 - adjustment and braking screw; 34 - conical cylinder; 341 - annular boss; 342 - adjustment groove; 343 - auxiliary plate; 35 - cutting nozzle; 170 - focusing lens holder. Detailed Embodiment

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this utility model will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed description will be omitted.

[0028] The terms "a", "an", "the", and "said" are used to denote the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to mean an open inclusion and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc.

[0029] As Figure 1-2 shown: An improved three-dimensional cutting head includes an anti-collision component 31, an air passage inlet 32, a focusing lens, a focusing lens holder 170, a tapered cylinder 34, and a cutting nozzle 5 with an end hole diameter not greater than 2.0 mm. An annular connecting plate 33 is provided between the focusing lens holder 170 and the tapered cylinder 34. The end of the tapered cylinder 34 is embedded in the annular connecting plate 33, and an adjusting brake screw 333 provided on the annular connecting plate 33 can adjust the relative position of the tapered cylinder 34 and the focusing lens holder 170 along the radial direction of the annular connecting plate 33.

[0030] Furthermore, one end face of the annular connecting plate 33 is an annular plane, and the other end face has an inner sunken annular groove 331. The annular plane end face of the annular connecting plate 33 is coaxially connected to the focusing lens holder 170. The annular groove 331 is used to accommodate the end of the tapered cylinder 34. There is a positioning pin hole on the annular connecting plate 33, and a positioning pin is correspondingly provided on the corresponding end face of the focusing lens holder 170 for positioning connection between the focusing lens holder 170 and the annular connecting plate 33; even-numbered pairs of threaded through holes 332 are equidistantly arranged on the circumference of the annular connecting plate 33 corresponding to the annular groove 331, and corresponding adjusting brake screws 333 are threadedly connected in the threaded through holes 332.

[0031] Furthermore, the tapered cylinder 34 is a hollow tapered structure. There is a ring of annular bosses 341 on the outer side of the upper end of the tapered cylinder 34. Even-numbered pairs of adjusting grooves 342 are equidistantly arranged on the circumference of the annular bosses 341. The front end of the adjusting brake screw 333 abuts against the bottom surface of the corresponding adjusting groove 342; to prevent damage to the bottom surface of the adjusting groove 342, an auxiliary plate 343 made of stainless steel material is provided in the adjusting groove 342, and the front end of the adjusting brake screw 333 abuts against the corresponding auxiliary plate 343.

[0032] Furthermore, there is a clearance fit between the inner side wall of the annular groove 331 of the annular connecting plate 33 and the outer wall of the end of the embedded conical cylinder 34, and the unilateral clearance width is 0.3 mm to 0.5 mm.

[0033] Furthermore, a sealing groove capable of partially accommodating a sealing ring is provided at a position close to the central through hole in the annular groove 331, and a high-pressure sealing ring is arranged in the sealing groove.

[0034] The following further illustrates an improved three-dimensional cutting head provided by the present invention through a specific embodiment. The improved three-dimensional cutting head includes an anti-collision component 31, an air path inlet 32, a focusing lens, a focusing lens holder 170, a conical cylinder 34, and a cutting nozzle 5 with an end hole diameter not greater than 2.0 mm. An annular connecting plate 33 is arranged between the focusing lens holder 170 and the conical cylinder 34, so that the relative positions of the focusing lens holder 170 and the conical cylinder 34 in the radial direction can be finely adjusted to correct the cumulative errors of the components of the three-dimensional laser cutting head, and make the focusing lens and the cutting nozzle 35 accurately coaxial.

[0035] The conical cylinder 34 is a hollow conical structure, and there is an annular boss 341 on the outer side of its upper end. Four adjusting grooves 342 are equidistantly arranged on the outer side of the annular boss 341, and an auxiliary plate 343 is arranged in each adjusting groove 342. The annular connecting plate 33 is used to connect the focusing lens holder 170 and the conical cylinder 34. One end face of it is an annular plane, and there is an annular groove 331 on the other end face. The annular plane end face of the annular connecting plate 33 is coaxially connected with the focusing lens holder 170, and the annular groove 331 just accommodates the annular boss 341 at the upper end of the conical cylinder 34. There is a positioning pin hole on the annular connecting plate 33, and a positioning pin is correspondingly arranged on the lower end face of the focusing lens holder 170 for positioning connection between the focusing lens holder 170 and the annular connecting plate 33; four radial threaded through holes 332 are equidistantly arranged on the outer side wall of the annular connecting plate 33, and these four threaded through holes 332 correspond to the four auxiliary plates 343 in the adjusting grooves 342 on the outer side of the annular boss 341 of the conical cylinder 34. The top of the adjusting brake screw 333 passing through the threaded through hole 332 abuts against the surface of the auxiliary plate 343, and the two relatively positioned adjusting brake screws 333 cooperate to finely adjust the position of the conical cylinder 34 in this radial direction. Thus, the relative positions between the conical cylinder 34 and the focusing lens holder 170 are finely adjusted through the annular connecting plate 33 to make the two accurately coaxial and achieve fine adjustment of the focusing optical path.

[0036] Furthermore, there is a clearance fit between the inner side wall of the annular groove 331 of the annular connecting plate 33 and the outer wall of the annular boss 341 of the conical cylinder 34, and the unilateral clearance width is 0.3 mm to 0.5 mm, preferably 0.375 mm. This clearance reserves space for fine adjustment of the position of the conical cylinder 34.

[0037] Furthermore, the auxiliary plate 343 is made of stainless steel material and is used to protect the bottom surface of the adjustment groove 342 outside the annular boss 341 of the conical cylinder 34, preventing the adjustment brake screw 333 from scratching the adjustment groove 342 during the process of finely adjusting the position of the conical cylinder 34 against the bottom surface of the adjustment groove 342, and also preventing the adjustment groove 342 from being damaged beyond repair after long-term use. If the auxiliary plate 343 is worn due to the position adjustment of the conical cylinder 34, the auxiliary plate 343 can be replaced, which has no impact on the conical cylinder 34.

[0038] Furthermore, at a position close to the central through hole in the annular groove 331 on the lower end surface of the annular connecting plate 33, there is a sealing groove that can partially accommodate a sealing ring. A high-pressure sealing ring is arranged in this sealing groove. When the annular connecting plate 33 is assembled and connected with the conical cylinder 34, the high-pressure sealing ring abuts against the upper end plane of the conical cylinder 34. When the position of the conical cylinder 34 is finely adjusted, its upper end surface slides relative to the high-pressure sealing ring and the annular connecting plate 33. After the position of the conical cylinder 34 is finely adjusted and determined, it is pressed towards the direction of the high-pressure sealing ring, and the conical cylinder 34 and the annular connecting plate 33 are fixedly connected by bolts. The high-pressure sealing ring forms a sealed connection between the annular connecting plate 33 and the conical cylinder 34 in the axial direction to prevent air leakage.

[0039] Furthermore, an air path channel is arranged in the side wall of the air path inlet part 32. At the corresponding position outside the side wall of the air path inlet part 32, there are a pair of radial counterbores. An air path connector is installed in the counterbores. The air path connector is communicated with the air supply unit through an air pipe. An axial through hole is arranged in the radial counterbore and is communicated with it, and the outlet of the axial through hole is on the bottom end surface of the air path inlet part 32. This outlet is seamlessly butted with the air path inlet on the focusing lens holder 170, and a sealing ring for increasing airtightness is arranged at the corresponding air path interface.

[0040] Furthermore, the focusing lens holder 170 is used to install the focusing lens. An air path channel is built in the side wall of the focusing lens holder 170. The inlet of this air path channel is seamlessly butted with the air path outlet of the upper air path inlet part. The air path outlets in the focusing lens holder 170 are evenly distributed on both the upper and lower sides of the focusing lens. There are at least two air path outlets on each side, preferably four, which are used to evenly blow the compressed air in the air path channel to the upper and lower sides of the focusing lens to help the focusing lens dissipate heat, and at the same time prevent impurities from adhering to the lens surface and keep the lens surface clean.

[0041] After the focusing lens is installed on the focusing lens holder 170, a conical cavity space is formed between the focusing lens and the conical cylinder 34. The compressed air output through the air path channel enters this space and then is output through the cutting nozzle 35 at the lower end of the conical cylinder 34. The laser beam focused by the focusing lens and the compressed air are output coaxially through the cutting nozzle 35. When the laser beam cuts the workpiece, the compressed air blows away the dust and slag generated by cutting, improving the smoothness of the cutting section.

[0042] The steps of adjusting the focusing optical path using the improved three-dimensional cutting head provided by the present utility model are as follows:

[0043] S1: Assembly of the conical cylinder on the laser cutting head: The conical cylinder 34 is pre-assembled under the focusing lens holder 170 through the annular connecting plate 33, and the lower port of the conical cylinder 34 is fixedly connected to the cutting nozzle 35;

[0044] S2: Laser output: Paste a layer of transparent tape on the light outlet of the cutting nozzle 35, and then control the A laser 10 to output laser with a power of about 5W and an output time of 200ms. The laser beam is reflected by the A1 mirror 11, A2 mirror 12, A3 mirror 13, A4 mirror 14, A5 mirror and A6 mirror in sequence and then enters the focusing lens in the laser cutting head 3. After being focused by the focusing lens, it is output from the light outlet at the end of the cutting nozzle 35, forming an ablation round hole with a diameter of about 0.5mm on the transparent tape at the light outlet;

[0045] S3: Concentricity measurement: Tear off the transparent tape with the ablation round hole formed in step S2 from the cutting nozzle 35. There will be a circular paste mark of the light outlet and an ablation round hole on the transparent tape. Use an electron microscope to detect whether the circular contour of the light outlet and the ablation round hole are concentric. The detection method is as follows: Select four measurement points approximately evenly on the circumference of the ablation round hole, and use an electron microscope to detect the distance from each measurement point to the inner side of the light outlet contour;

[0046] S4: Judgment and adjustment based on the measurement results in step S3. Let the distances from the four measurement points on the ablation round hole in step S3 to the inner side of the light outlet contour be D, where the maximum distance is Dmax and the minimum distance is Dmin. Determine whether Dmax and Dmin simultaneously satisfy: Dmin≥0.5mm, Dmax - Dmin≤0.5mm:

[0047] S41. If satisfied, it can be determined that the ablation round hole is concentric with the light outlet contour, that is, the laser beam transmission direction is coaxial with the light outlet. The relative position between the conical cylinder 34 and the focusing lens holder 170 does not need to be further adjusted. Fix the conical cylinder 34 pre-assembled under the focusing lens holder 170 at this position, complete the fixed connection between the focusing lens holder 170 and the conical cylinder 34, and complete the focusing optical path adjustment of the three-dimensional cutting head;

[0048] S42. If not satisfied, it means that the ablation round hole is not concentric with the light outlet contour, that is, the laser beam transmission direction is not coaxial with the light outlet, and enter step S5;

[0049] S5. Use the measurement data in step S3 to judge the deviation direction of the conical cylinder 34 relative to the focusing lens holder 170, and finely adjust the relative position in the radial direction between the conical cylinder 34 and the focusing lens holder 170 through the adjustment brake screw 333 on the annular connecting plate 33 to make the two as coaxial as possible, and return to step S2.

[0050] The improved three-dimensional laser cutting head provided by the present utility model adds a ring connecting plate 33 between the focusing lens seat 170 and the conical cylinder 34, enabling fine adjustment of the relative positions of the focusing lens seat 170 and the conical cylinder 34 in the radial direction to correct the cumulative errors of the components of the three-dimensional laser cutting head and enabling the focusing lens and the cutting nozzle 35 to be accurately coaxial.

[0051] For the improved three-dimensional laser cutting head provided by the present utility model, when the aperture of the end hole of the cutting nozzle 35 is reduced to 2.0 mm, it can still ensure the accurate output of the laser beam without interference with the cutting nozzle 35; the aperture of the end hole of the original cutting nozzle 35 is reduced from 2.5 mm to 2.0 mm, and the outlet cross-sectional area of the cutting nozzle 35 is reduced by 36%. Without changing the air pressure of the compressed air at the cutting nozzle 35, the consumption of the compressed air is reduced by 36%, effectively reducing the production cost.

[0052] In the embodiments of the present utility model, the term "a plurality" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", and "fixed" should all be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0053] In the description of the embodiments of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation to the embodiments of the present utility model.

[0054] In the description of this specification, the description of terms such as "an embodiment" and "a preferred embodiment" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0055] The above embodiments are only used to illustrate the technical idea of the present utility model, and the protection scope of the present utility model cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present utility model falls within the protection scope of the present utility model; the technologies not involved in the present utility model can all be realized through the prior art.

Claims

1. An improved three-dimensional cutting head, comprising an anti-collision component (31), an air path inlet piece (32), a focusing lens, a focusing lens holder (170), a conical cylinder (34) and a cutting nozzle (5), characterized in that: An annular connecting plate (33) is provided between the focusing lens holder (170) and the conical cylinder (34). The end of the conical cylinder (34) is embedded in the annular connecting plate (33), and the adjusting and braking screw (333) provided on the annular connecting plate (33) can adjust the relative positions of the conical cylinder (34) and the focusing lens holder (170) along the radial direction of the annular connecting plate (33).

2. The improved three-dimensional cutting head according to claim 1, characterized in that: One end face of the annular connecting plate (33) is an annular plane, and the other end face has an inner sunken annular groove (331). The annular plane end face of the annular connecting plate (33) is coaxially connected to the focusing lens holder (170), and the annular groove (331) is used to accommodate the end of the conical cylinder (34); an even number of pairwise opposite threaded through holes (332) are equidistantly arranged on the circumference of the annular connecting plate (33) corresponding to the annular groove (331), and the corresponding adjusting and braking screw (333) is threadedly connected in the threaded through hole (332).

3. The improved three-dimensional cutting head according to claim 1 or 2, characterized in that: There is a positioning pin hole on the annular connecting plate (33), and a positioning pin is correspondingly arranged on the corresponding end face of the focusing lens holder (170) for positioning connection between the focusing lens holder (170) and the annular connecting plate (33).

4. The improved three-dimensional cutting head according to claim 1 or 2, characterized in that: The conical cylinder (34) is a hollow conical structure. There is a ring of annular bosses (341) on the outer side of the upper end of the conical cylinder (34). An even number of pairwise opposite adjusting grooves (342) are equidistantly arranged on the circumference of the annular boss (341), and the front end of the adjusting and braking screw (333) abuts against the bottom surface of the corresponding adjusting groove (342).

5. The improved three-dimensional cutting head according to claim 4, wherein: An auxiliary plate (343) is arranged in the adjusting groove (342), and the front end of the adjusting and braking screw (333) abuts against the corresponding auxiliary plate (343).

6. The improved three-dimensional cutting head according to claim 5, characterized in that: The auxiliary plate (343) is made of stainless steel material.

7. The improved three-dimensional cutting head according to claim 1 or 2, characterized in that: The inner side wall of the annular groove (331) of the annular connecting plate (33) and the outer wall of the end of the embedded conical cylinder (34) are in clearance fit, and the unilateral clearance width is 0.3 mm to 0.5 mm.

8. The improved three-dimensional cutting head according to claim 2, characterized in that: A sealing groove capable of partially accommodating a sealing ring is provided at a position close to the central through hole in the annular groove (331), and a high-pressure sealing ring is arranged in the sealing groove.

9. The improved three-dimensional cutting head according to claim 1, wherein: The aperture of the end hole of the cutting nozzle (5) is not greater than 2.0 mm.

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