A laser cutting head

Abstract

The application relates to a laser cutting head which comprises a fiber laser mounting seat, a collimating mirror support frame cover, a collimating mirror group support frame, an outer shell, a focusing mirror protection cover, a high airflow nozzle support frame, a high airflow nozzle, a collimating mirror and a focusing mirror, and the collimating mirror group support frame and the outer shell, the outer shell and the focusing mirror protection cover, and the focusing mirror protection cover and the high airflow nozzle support frame are connected together through convex block and groove structure. The collimating mirror group support frame and the outer shell, the outer shell and the focusing mirror protection cover, and the focusing mirror protection cover and the high airflow nozzle support frame are connected together through convex block and groove structure, the positioning parts caused by the above-mentioned pin positioning are reduced, the size chain is long, and the problems of poor focusing effect of a light spot and poor cutting quality caused by the problems are solved; the ratio between the support length L of the focusing mirror mounting frame and the diameter D of the focusing mirror is greater than or equal to 1.46, and the ratio is helpful to improving the up-down adjusting precision of the focusing mirror piece assembly.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology, and in particular to a laser cutting head. Background Technology

[0002] Extensive research revealed that prior art publication number CN206643498U discloses a laser cutting head with adjustable focusing lens and a laser cutting machine. The adjustable focusing lens laser cutting head includes an optical fiber assembly, a collimating lens assembly, a focusing lens assembly, and a nozzle assembly. The focusing lens assembly includes a focusing lens cavity, a focusing lens mount, and a focusing lens. The focusing lens cavity has a position adjustment slot, and the focusing lens mount is disposed within the position adjustment slot. The focusing lens is mounted on the focusing lens mount and located below the collimating lens and above the nozzle assembly. The focusing lens cavity is also equipped with a position adjustment mechanism for adjusting the forward, backward, left, and right movement of the focusing lens mount relative to the focusing lens cavity within the position adjustment slot. This invention allows adjustment of the focusing lens's position by adjusting the forward, backward, left, and right positions of the focusing lens mount, thereby adjusting the light spot on the focusing lens to the focal center position for alignment with the nozzle assembly. The focal center remains fixed, adjustment is convenient, and the beam incident angle is accurate.

[0003] Currently, the installation of the collimating lens assembly support frame, focusing lens assembly support frame, protective lens support frame, and high-speed airflow nozzle in laser cutting heads primarily relies on pin connections to achieve coaxiality. This pin-connection structure involves numerous parts and a long dimensional chain, easily leading to a lack of high-precision coaxiality among the collimating lens assembly, focusing lens assembly, protective lens support frame, and high-speed airflow nozzle. This results in poor focusing of the laser spot and affects cutting quality. Furthermore, the ratio of the support length to the focusing lens diameter on the auxiliary support frame for adjusting the focusing lens assembly in the Z-axis direction of existing laser cutting heads is relatively small. Due to dimensional errors in the parts, this small diameter ratio exacerbates the shift in the focusing lens's focal point position, affecting the coaxiality between the laser spot transmission path and the high-speed airflow nozzle axis. Each Z-axis adjustment causes a change in the positional accuracy of the focused spot, severely impacting cutting accuracy and kerf quality.

[0004] In view of the above-mentioned shortcomings, the designer has actively researched and innovated in order to create a laser cutting head that has greater industrial application value. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a laser cutting head.

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

[0007] A laser cutting head includes a fiber laser mounting base, a collimating lens support cover, a collimating lens assembly support frame, an outer shell, a focusing lens protective cover, a high-speed airflow nozzle support frame, a high-speed airflow nozzle, a collimating lens, and a focusing lens;

[0008] The bottom of the fiber laser mount is installed together with the collimator assembly support frame below it. The collimator support frame cover is closed onto the collimator assembly support frame outside the fiber laser mount. The bottom of the collimator assembly support frame is installed together with the outer shell below it. A collimator mounting bracket is installed between the collimator assembly support frame and the outer shell. The collimator is installed in the collimator mounting bracket by a collimator clamping plate. A focusing lens mounting bracket is installed in the outer shell below the collimator mounting bracket. The focusing lens is installed in the focusing lens mounting bracket by a focusing lens clamping plate. The bottom of the outer shell is installed together with the focusing lens protective cover below it. A high-speed airflow nozzle support bracket is installed at the bottom of the focusing lens protective cover. A high-speed airflow nozzle is installed at the bottom of the high-speed airflow nozzle support bracket.

[0009] The ratio between the support length L of the focusing lens mount and the diameter D of the focusing lens is greater than or equal to 1.46.

[0010] As a further improvement of the present invention, the collimating lens assembly support frame and the outer shell, the outer shell and the focusing lens protective cover, and the focusing lens protective cover and the high-flow nozzle support frame are all connected together by a protrusion and groove structure.

[0011] As a further improvement of the present invention, a first groove is provided on the inner side of the bottom of the collimating lens assembly support frame, and a first protrusion is provided on the top of the outer shell body, which is connected to the first groove above.

[0012] As a further improvement of the present invention, a second groove is provided on the bottom inner side of the outer casing, and a second protrusion is provided on the top of the focusing lens protective cover, which is connected to the second groove above.

[0013] As a further improvement of the present invention, a third protrusion is provided at the bottom of the focusing lens protective cover, and a third groove is provided on the inner side of the top of the high-flow nozzle support bracket, which is connected to the third protrusion above.

[0014] As a further improvement of the present invention, a first O-ring is provided between the collimator assembly support frame and the collimator mounting frame.

[0015] As a further improvement of the present invention, a second O-ring is provided between the focusing lens protective cover and the high-flow nozzle support.

[0016] As a further improvement of the present invention, a lower support base is provided between the bottom of the focusing lens mounting bracket and the lower focusing lens protective cover. A plurality of support pins are provided on the lower support base along the circumferential direction, and the support pins are connected to the bottom of the upper focusing lens mounting bracket.

[0017] As a further improvement of the present invention, an adjustment wheel is provided on the outer side of the focusing lens mounting bracket near the bottom, and a first slot is provided on the outer shell on one side of the adjustment wheel.

[0018] As a further improvement of the present invention, a second slot is provided on one side of the focusing lens protective cover. The lens mounting bracket can be inserted into the focusing lens protective cover through the second slot. The lens mounting bracket is installed on the focusing lens protective cover by a number of tightening bolts. A plane lens is installed in the lens mounting bracket. The collimating lens, focusing lens and plane lens are arranged sequentially from top to bottom and are coaxial.

[0019] As a further improvement of the present invention, a mounting bracket is also provided on one side of the outer casing.

[0020] By means of the above-described solution, the present invention has at least the following advantages:

[0021] In this invention, the collimating lens assembly support frame and the outer shell, the outer shell and the focusing lens protective cover, and the focusing lens protective cover and the high-speed airflow nozzle support frame are all connected by a protrusion-groove structure. This reduces the problems of poor beam focusing effect and poor cutting quality caused by the large number of positioning parts and long dimensional chains resulting from pin positioning. This invention improves the ratio of the support length on the auxiliary support frame of the focusing lens assembly to the diameter of the focusing lens, reduces the amplification effect of dimensional errors, and improves the accuracy of beam focusing position and cutting quality.

[0022] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a laser cutting head according to the present invention;

[0025] Figure 2 yes Figure 1 Internal structure diagram;

[0026] Figure 3 yes Figure 2 A schematic diagram of a local part of the structure.

[0027] The meanings of the labels in the figures are as follows.

[0028] 1. Fiber laser mounting base; 2. Collimating lens support cover.

[0029] 3 Collimating lens assembly support frame 4 Housing body

[0030] 5 Mounting bracket 6 Focusing lens protective cover

[0031] 7 First slot 8 Adjustment wheel

[0032] 9. Second slot opening 10. Tighten bolts

[0033] 11 Lens mounting bracket 12 High-speed airflow nozzle support bracket

[0034] 13 High-speed airflow nozzle 14 Collimating lens mounting bracket

[0035] 15 Collimating lens 16 Collimating lens pressure plate

[0036] 17 Focusing lens mounting bracket 18 Focusing lens

[0037] 19 Focusing lens pressure plate 20 Support pin

[0038] 21 Lower support base 22 Plane lens Detailed Implementation

[0039] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] Example

[0042] like Figures 1-3 As shown,

[0043] A laser cutting head includes a fiber laser mounting base 1, a collimator support cover 2, a collimator assembly support frame 3, a housing 4, a focusing lens protective cover 6, a high-speed airflow nozzle support frame 12, a high-speed airflow nozzle 13, a collimator 15, and a focusing lens 18. The bottom of the fiber laser mounting base 1 is mounted together with the collimator assembly support frame 3 below it. The collimator support cover 2 covers the collimator assembly support frame 3 on the outside of the fiber laser mounting base 1. The bottom of the collimator assembly support frame 3 is mounted together with the housing 4 below it. A mounting bracket 5 is also provided on one side of the housing 4. A collimator mounting bracket 14 is installed between the collimator assembly support frame 3 and the housing 4. The collimator 15 is installed in the collimator mounting bracket 14 through a collimator pressure plate 16. A focusing lens mounting bracket 17 is installed in the housing 4 below and outside the collimator mounting bracket 14. The focusing lens 18 is installed in the focusing lens mounting bracket 17 through a focusing lens pressure plate 19. A lower support base 21 is provided between the bottom of the focusing lens mounting bracket 17 and the lower focusing lens protective cover 6. Several support pins 20 are provided on the lower support base 21 along the circumferential direction. The support pins 20 are connected to the bottom of the upper focusing lens mounting bracket 17.

[0044] The focusing lens mounting bracket 17 has an adjusting wheel 8 on its outer side near the bottom. A first slot 7 is provided on the outer housing 4 on one side of the adjusting wheel 8. A second slot 9 is provided on one side of the focusing lens protective cover 6. The lens mounting bracket 11 can be inserted into the focusing lens protective cover 6 through the second slot 9. The lens mounting bracket 11 is mounted on the focusing lens protective cover 6 by several tightening bolts 10. A plane lens 22 is installed inside the lens mounting bracket 11. The collimating lens 15, focusing lens 18, and plane lens 22 are arranged sequentially from top to bottom and are coaxial. The bottom of the outer housing 4 is installed together with the focusing lens protective cover 6 below. A high-speed airflow nozzle support bracket 12 is installed at the bottom of the focusing lens protective cover 6, and a high-speed airflow nozzle 13 is installed at the bottom of the high-speed airflow nozzle support bracket 12.

[0045] The collimating lens support bracket 3 has a first groove on its bottom inner side, and the outer shell 4 has a first protrusion on its top that connects to the first groove above; the outer shell 4 has a second groove on its bottom inner side, and the focusing lens protective cover 6 has a second protrusion on its top that connects to the second groove above; the focusing lens protective cover 6 has a third protrusion on its bottom, and the high-speed airflow nozzle support bracket 12 has a third groove on its top inner side that connects to the third protrusion above.

[0046] The collimating lens assembly support frame 3 is connected to the outer shell 4, the outer shell 4 is connected to the focusing lens protective cover 6, and the focusing lens protective cover 6 is connected to the high-speed airflow nozzle support frame 12 via a protrusion and groove structure. This can reduce the problems of poor beam focusing effect and poor cutting quality caused by the large number of positioning parts and long dimensional chain due to the aforementioned pin positioning.

[0047] The ratio between the support length L of the focusing lens mount 17 and the diameter D of the focusing lens 18 is greater than or equal to 1.46. By increasing the ratio of the support length on the auxiliary support frame of the focusing lens group to the diameter of the focusing lens, the amplification effect of dimensional errors is reduced, thereby improving the focusing accuracy of the spot and the quality of the kerf.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element 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 of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly referring to the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood through the specific circumstances.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A laser cutting head, comprising a fiber laser mounting base (1), a collimating lens support cover (2), a collimating lens assembly support frame (3), an outer shell (4), a focusing lens protective cover (6), a high-speed airflow nozzle support frame (12), a high-speed airflow nozzle (13), a collimating lens (15), and a focusing lens (18), characterized in that: The bottom of the fiber laser mounting base (1) is installed together with the collimator assembly support frame (3) below it. The collimator support frame cover (2) covers the collimator assembly support frame (3) on the outside of the fiber laser mounting base (1). The bottom of the collimator assembly support frame (3) is installed together with the outer shell (4) below it. A collimator mounting bracket (14) is installed between the collimator assembly support frame (3) and the outer shell (4). The collimator (15) is installed on the collimator via a collimator clamping plate (16). Inside the mounting bracket (14), a focusing lens mounting bracket (17) is installed inside the outer shell (4) below the collimating lens mounting bracket (14). The focusing lens (18) is installed inside the focusing lens mounting bracket (17) via a focusing lens pressure plate (19). The bottom of the outer shell (4) is installed together with the focusing lens protective cover (6) below. A high-speed airflow nozzle support bracket (12) is installed at the bottom of the focusing lens protective cover (6). A high-speed airflow nozzle (13) is installed at the bottom of the high-speed airflow nozzle support bracket (12). The ratio between the support length (L) of the focusing lens mounting bracket (17) and the diameter (D) of the focusing lens (18) is greater than or equal to 1.

46.

2. A laser cutting head as described in claim 1, characterized in that, The collimating lens support frame (3) and the outer shell (4), the outer shell (4) and the focusing lens protective cover (6), and the focusing lens protective cover (6) and the high-speed airflow nozzle support frame (12) are all connected together by a protrusion and groove structure.

3. A laser cutting head as described in claim 2, characterized in that, The collimating lens support frame (3) has a first groove on its bottom inner side, and the outer shell (4) has a first protrusion on its top that connects to the first groove above.

4. A laser cutting head as described in claim 2, characterized in that, The bottom inner side of the outer casing (4) is provided with a second groove, and the top of the focusing lens protective cover (6) is provided with a second protrusion that connects to the second groove above.

5. A laser cutting head as described in claim 2, characterized in that, The bottom of the focusing lens protective cover (6) is provided with a third protrusion, and the top inner side of the high airflow nozzle support frame (12) is provided with a third groove that connects to the third protrusion above.

6. A laser cutting head as described in claim 1, characterized in that, A first O-ring is provided between the collimator assembly support frame (3) and the collimator mounting frame (14).

7. A laser cutting head as described in claim 1, characterized in that, A second O-ring is provided between the focusing lens protective cover (6) and the high-flow nozzle support frame (12).

8. A laser cutting head as described in claim 1, characterized in that, A lower support base (21) is provided between the bottom of the focusing lens mounting bracket (17) and the lower focusing lens protective cover (6). Several support pins (20) are provided on the lower support base (21) along the circumferential direction. The support pins (20) are connected to the bottom of the upper focusing lens mounting bracket (17).

9. A laser cutting head as described in claim 1, characterized in that, The focusing lens mounting bracket (17) is also provided with an adjustment wheel (8) on the outer side near the bottom, and a first slot (7) is provided on the outer shell (4) on one side of the adjustment wheel (8).

10. A laser cutting head as described in claim 1, characterized in that, A second slot (9) is provided on one side of the focusing lens protective cover (6). The lens mounting bracket (11) can be inserted into the focusing lens protective cover (6) through the second slot (9). The lens mounting bracket (11) is installed on the focusing lens protective cover (6) by several tightening bolts (10). A plane lens (22) is installed in the lens mounting bracket (11). The collimating lens (15), focusing lens (18) and plane lens (22) are arranged from top to bottom and are coaxial.

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