A two-stage light spot variable mechanism

Abstract

This utility model provides a two-stage variable spot mechanism, relating to the field of laser cutting head spot technology. It includes: a collimating and focusing frame, with a lens holder bracket slidably connected to its front and rear sides. A collimating lens one and a collimating lens two are connected within the collimating and focusing frame cavity via a limiting plate. An upper protective lens, a focusing lens, a lower second protective lens, and a lower protective lens are mounted on the left side of the lens holder bracket via fastening bolts. The collimating and focusing frame is supported by an electric push rod on the right side of the lens holder bracket. A first adjusting screw and a second adjusting screw are connected to the right side of the limiting plate via a drive block. A motor is connected to the right end of the first adjusting screw via a transmission column, and a transmission component is mounted on the surface of the transmission column. This utility model solves the problem in the prior art where the fixed focusing position of the collimating lens group during rotation affects the switching effect of the large and small spot sizes.

Description

Technical Field

[0001] This utility model relates to the field of laser cutting head spot technology, specifically to a two-stage variable spot mechanism. Background Technology

[0002] Traditional laser cutting heads typically have fixed focal lengths and spot sizes, meaning that to adapt to different thicknesses and types of sheet metal or different cutting requirements, it is necessary to change the cutting head or adjust the working distance. This has led to the development of variable spot laser cutting technology, a technique used to improve laser processing efficiency and quality. It allows laser cutting equipment to flexibly adjust the beam size and shape during operation. In the laser cutting industry, the choice of spot size has different effects on sheet metal of varying thicknesses. A search revealed an existing technology (publication number: CN202420919091.8) that describes a two-stage variable spot laser cutting head mechanism. The document states that "this mechanism mainly achieves spot size changes by rapidly changing the collimating lens group. During operation, it is necessary to ensure that at least one collimating lens group is coaxial with the focusing lens group, and the laser beam must be coaxial with this lens group. The provided two-stage variable spot laser cutting head mechanism can provide different spot sizes according to the different sheet thicknesses being processed, thereby achieving efficient and high-quality processing." However, the relatively fixed focusing position of the collimating lens group in the existing technology affects the switching effect between different spot sizes. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a two-stage variable spot mechanism is provided to solve the problem that the fixed focusing position of the collimating lens group rotation in existing technologies affects the switching effect of the spot size.

[0004] To achieve the above objectives, a two-stage variable spot mechanism is provided, comprising: a collimating and focusing frame, wherein a lens mount bracket is slidably connected to the front and rear sides of the collimating and focusing frame.

[0005] Collimating lens one and collimating lens two are connected inside the collimating and focusing frame cavity via a limiting plate. The upper protective lens, focusing lens, lower second protective lens, and lower protective lens are installed on the left side of the lens holder bracket via fastening bolts. The collimating and focusing frame is supported on the right side of the lens holder bracket via an electric push rod. The right side of the limiting plate is connected to the first adjusting screw and the second adjusting screw via a drive block. The right end of the first adjusting screw is connected to a motor via a transmission column. A transmission component is installed on the surface of the transmission column.

[0006] Furthermore, a cover plate is screwed to the right end of the collimating and focusing frame, a motor is fixed to the right end of the cover plate, and a small controller is installed on the front surface of the collimating and focusing frame.

[0007] Furthermore, the collimating and focusing frame has two sets of storage cavities on its inner side, one upper and one lower; and the two sets of storage cavities respectively house collimating lens one and collimating lens two.

[0008] Furthermore, a distance sensor is fixed to the lower surface of the collimating and focusing frame, and a limiting plate is slidably connected to the inner side of the receiving cavity; and collimating lens one and collimating lens two are installed on the left side of the limiting plate.

[0009] Furthermore, a first adjusting screw and a second adjusting screw are installed inside the collimating and focusing frame cavity; and the first adjusting screw and the second adjusting screw are respectively located at the lower ends of collimating lens one and collimating lens two.

[0010] Furthermore, the upper protective lens, focusing lens, lower second protective lens, and lower protective lens are arranged vertically from top to bottom.

[0011] Furthermore, a collimating lens one or a collimating lens two is distributed between the upper protective lens and the focusing lens.

[0012] The beneficial effects of this utility model are as follows: the two-stage variable spot mechanism utilizes the synchronous rotation of the first and second adjusting screws within the collimating and focusing frame to drive collimating lens one and collimating lens two to alternately retract or extend into the collimating and focusing frame slots. Simultaneously, the electric push rod pushes the collimating and focusing frame up and down to adjust the height of the collimating lenses, facilitating efficient and flexible adjustment and switching of spot sizes. By changing the focal length of the collimating lenses, the two-stage switching of spot size is achieved, ensuring the accuracy of the laser optical path, optimizing the transmission efficiency of the laser beam, facilitating the cutting of plates of different thicknesses, and improving laser cutting efficiency and quality. Attached Figure Description

[0013] Figure 1 This is a front view schematic diagram of the two-stage variable spot mechanism according to an embodiment of the present invention.

[0014] Figure 2 This is a front view cross-sectional structural diagram of the two-stage variable spot mechanism according to an embodiment of the present invention.

[0015] Figure 3 This is a schematic diagram of the focusing structure of the collimating lens one according to an embodiment of the present invention.

[0016] Figure 4 This is a schematic diagram of the focusing structure of the collimating lens two in an embodiment of the present invention.

[0017] In the diagram: 1. Collimation and focusing frame; 11. Cover plate; 12. Mini controller; 13. Limiting plate; 14. Storage cavity; 15. Distance sensor; 2. Upper protective lens; 3. Collimation lens one; 31. Collimation lens two; 4. Focusing lens; 5. Lower second protective lens; 6. Lower protective lens; 7. Lens holder bracket; 71. Fastening bolt; 72. Electric actuator; 8. First adjusting screw; 81. Motor; 82. Transmission assembly; 83. Drive block; 84. Transmission column; 85. Second adjusting screw. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Reference Figures 1 to 4 As shown, this utility model provides a two-stage variable spot mechanism, including: a collimating and focusing frame 1, with a lens mount bracket 7 slidably connected to the front and rear sides of the collimating and focusing frame 1.

[0020] Collimating lens 1 and collimating lens 2 are connected to the cavity of collimating frame 1 by limiting plate 13. Upper protective lens 2, focusing lens 4, lower second protective lens 5 and lower protective lens 6 are installed on the left side of lens holder bracket 7 by fastening bolt 71. Collimating frame 1 is supported on the right side of lens holder bracket 7 by electric push rod 72. First adjusting screw 8 and second adjusting screw 85 are connected to the right side of limiting plate 13 by drive block 83 respectively. Motor 81 is connected to the right end of first adjusting screw 8 by transmission column 84. Transmission component 82 is installed on the surface of transmission column 84.

[0021] First, the laser cutting head directs the laser beam through the central axis from the fiber optic output point along the upper protective lens 21, collimating lens 1 or collimating lens 2 31, focusing lens 4, lower second protective lens 5, and lower protective lens 6. Finally, the high-energy laser beam irradiates the sheet metal. When it is necessary to switch between collimating lenses with different focal lengths, the small controller 12 controls the motor 81 to start, driving the first adjusting screw 8 and the second adjusting screw 85 to rotate. This causes the drive block 83 connected to the side end of collimating lens 1 3 and collimating lens 2 31 to move collimating lens 1 3 and collimating lens 2 31 horizontally in opposite directions. This allows collimating lens 1 3 or collimating lens 2 31 to alternately extend from the cavity of the collimating and focusing frame 1 and align with the central axis. The electric push rod 72 pushes the collimating and focusing frame 1 to move up and down, causing collimating lens 1 3 and collimating lens 2 31 to move up and down as a whole, adjusting the height of the collimating lens. This facilitates efficient and flexible adjustment and switching of light spots of different sizes.

[0022] In this embodiment, a cover plate 11 is screwed to the right end of the collimating and focusing frame 1, and a motor 81 is fixed to the right end of the cover plate 11. A small controller 12 is installed on the front surface of the collimating and focusing frame 1. The collimating and focusing frame 1 has two sets of storage cavities 14 on its inner side; and the upper and lower sets of storage cavities 14 respectively store collimating lens 1 3 and collimating lens 2 31. A distance sensor 15 is fixed to the lower surface of the collimating and focusing frame 1, and a limit plate 13 is slidably connected to the inner side of the storage cavity 14; and collimating lens 1 3 and collimating lens 2 31 are installed on the left side of the limit plate 13.

[0023] In a preferred embodiment, motor 81 drives the transmission column 84 at the side of the first adjusting screw 8 to rotate, causing the transmission assembly 82, composed of a transmission wheel and a transmission belt, to drive the lower second adjusting screw 85 to rotate synchronously. This facilitates the synchronous reverse movement of collimating lens 3 and collimating lens 31. Collimating lens 3 and collimating lens 31 are collimating lenses with different focal lengths. Distance sensor 15 senses the vertical movement distance of the collimating focusing frame 1, facilitating the adjustment of the height position of collimating lens 3 or collimating lens 31. Miniature controller 12 electrically controls the extension and retraction of electric actuator 72 to move the collimating focusing frame 1 vertically, the operation of motor 81, and signal reception.

[0024] In this embodiment, a first adjusting screw 8 and a second adjusting screw 85 are installed inside the collimating and focusing frame 1; and the first adjusting screw 8 and the second adjusting screw 85 are respectively located at the lower ends of the collimating lens 1 3 and the collimating lens 2 31.

[0025] In a preferred embodiment, the first adjusting screw 8 and the second adjusting screw 85 rotate synchronously through the transmission column 84 and the transmission assembly 82, but the threads on the surfaces of the first adjusting screw 8 and the second adjusting screw 85 are opposite, so that the two sets of driving blocks 83 on the surfaces of the first adjusting screw 8 and the second adjusting screw 85 convert the rotational motion into linear reverse motion, driving the collimating lens 1 3 and the collimating lens 2 31 to move synchronously and in opposite directions horizontally, so that the collimating lens 1 3 and the collimating lens 2 31 can alternately move into or out of the collimating focusing frame 1 cavity, realizing a two-level switching effect of the spot size by changing the focal length of the collimating lens.

[0026] In this embodiment, the upper protective lens 2, the focusing lens 4, the lower second protective lens 5, and the lower protective lens 6 are arranged vertically from top to bottom. A collimating lens 3 or a collimating lens 31 is distributed between the upper protective lens 2 and the focusing lens 4.

[0027] In a preferred embodiment, the upper protective lens 2, the lower second protective lens 5, and the lower protective lens 6 protect the central focusing lens 4, collimating lens 1 3, and collimating lens 2 31, reducing the degree of damage to these components (all lenses mentioned herein include lens mounts). The focusing lens 4 facilitates the focusing of the collimated beam emitted from the collimating lens 1 3 or the collimating lens 2 31.

[0028] This invention's two-stage variable spot mechanism effectively solves the problem in existing technologies where the fixed focusing position of the collimating lens group affects the switching effect of different spot sizes. It facilitates efficient and flexible adjustment and switching of spot sizes, achieving two-stage switching of spot size by changing the focal length of the collimating lens. This ensures the accuracy of the laser optical path, optimizes the transmission efficiency of the laser beam, facilitates the cutting of plates of different thicknesses, and improves laser cutting efficiency and quality. It is applicable to two-stage variable spot mechanisms.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A two-stage variable light spot mechanism comprising: Collimation and focusing frame (1), wherein a lens mount bracket (7) is slidably connected to the front and rear sides of the collimation and focusing frame (1), characterized in that: The collimating and focusing frame (1) is connected to collimating lens one (3) and collimating lens two (31) through a limiting plate (13). The left end of the lens holder bracket (7) is equipped with an upper protective lens (2), a focusing lens (4), a lower second protective lens (5) and a lower protective lens (6) through fastening bolts (71). The right end of the lens holder bracket (7) is supported by an electric push rod (72) for collimating and focusing frame (1). The right side of the limiting plate (13) is connected to a first adjusting screw (8) and a second adjusting screw (85) through a drive block (83). The right end of the first adjusting screw (8) is connected to a motor (81) through a transmission column (84). A transmission component (82) is installed on the surface of the transmission column (84).

2. A two-stage variable light spot mechanism according to claim 1, characterized in that The collimation and focusing frame (1) is screwed to the right end of a cover plate (11), and a motor (81) is fixed to the right end of the cover plate (11). A small controller (12) is installed on the front surface of the collimation and focusing frame (1).

3. A two-stage variable light spot mechanism according to claim 1, wherein The collimation and focusing frame (1) has two sets of storage cavities (14) on its inner side; and the two sets of storage cavities (14) respectively store collimating lens one (3) and collimating lens two (31).

4. A two-stage variable spot mechanism according to claim 3, wherein A distance sensor (15) is fixed on the lower surface of the collimating and focusing frame (1), and a limiting plate (13) is slidably connected inside the receiving cavity (14); and collimating lens one (3) and collimating lens two (31) are installed on the left side of the limiting plate (13).

5. The two-stage variable spot mechanism according to claim 1, characterized in that, The collimating and focusing frame (1) is equipped with a first adjusting screw (8) and a second adjusting screw (85); and the first adjusting screw (8) and the second adjusting screw (85) are respectively located at the lower ends of the collimating lens one (3) and the collimating lens two (31).

6. A two-stage variable spot mechanism according to claim 1, wherein The upper protective lens (2), focusing lens (4), lower second protective lens (5) and lower protective lens (6) are arranged vertically from top to bottom.

7. A two-stage variable spot mechanism according to claim 6, characterized in that Collimating lens one (3) or collimating lens two (31) is distributed between the upper protective lens (2) and the focusing lens (4).

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