A lens switching mechanism for a dual-light-source laser engraving machine and a laser engraving machine

Abstract

The present invention relates to the technical field of laser processing, and particularly to a lens switching mechanism for a dual-light-source laser engraving machine and a laser engraving machine. It includes: a rotating base, with rotating arms extending outwardly on both sides of the rotating base, and a first reflector and a second reflector are respectively connected to the outer ends of the two rotating arms; a substrate, arranged vertically, with a shaft hole provided at the upper end; a first rotating shaft, one end of which passes through the shaft hole and is fixedly connected to the rotating base; the first rotating shaft is rotatably connected to the substrate, and the other end of the first rotating shaft is connected to a power unit through a transmission unit; the power unit drives the first rotating shaft to rotate through the transmission unit and drives the rotating base to rotate, and the first reflector and the second reflector can be switched into the reflection position. By providing the lens switching mechanism, the present invention can switch and use one of the reflectors in the optical path, effectively reducing laser loss and improving the effective utilization rate of the laser.

Description

Technical Field

[0001] The present invention relates to the technical field of laser processing, and particularly relates to a lens switching mechanism of a dual-source laser engraving machine and a laser engraving machine. Background Art

[0002] When lasers of different wavelengths are reflected by the same mirror material, the absorption rate of the material for lasers of different wavelengths is different. Therefore, when setting up the optical path system of a laser engraving machine, the lens material is basically selected as the material that is most suitable for the laser. When using a dual-source laser engraving machine, since it uses two laser emitters, in the design of the optical path system, the mirror connected to the laser engraving head is a shared mirror, and the lens material of this mirror can only be selected as the material that has a relatively small absorption rate for the two lasers emitted by the two laser emitters. However, this mirror material still has a relatively large absorption for the two lasers. Summary of the Invention

[0003] The purpose of the present invention is to provide a lens switching mechanism of a dual-source laser engraving machine for the deficiencies of the prior art. This lens switching mechanism is connected to the laser engraving head and is provided with a switchable mirror to reduce the loss of the dual-source laser absorbed by the mirror during use, and can achieve better energy conservation and engraving effects.

[0004] Another purpose of the present invention is to provide a laser engraving machine with the above-mentioned lens switching system.

[0005] A lens switching mechanism includes:

[0006] A rotating base, with rotating arms extending outward on both sides of the rotating base, and a first mirror and a second mirror are respectively connected to the outer ends of the two rotating arms;

[0007] A substrate, which is vertically arranged and has a shaft hole at the upper end;

[0008] A first rotating shaft, one end of which passes through the shaft hole and is fixedly connected to the rotating base; the first rotating shaft is rotationally connected to the substrate, and the other end of the first rotating shaft is connected to a power unit through a transmission unit;

[0009] The power unit drives the first rotating shaft to rotate through the transmission unit and drives the rotating base to rotate, so that the first mirror and the second mirror can be switched to the reflection position.

[0010] Furthermore, a positioning structure is provided between the rotating base and the substrate or between the first rotating shaft and the substrate. When the first mirror or the second mirror is in the reflection position, the rotating base is clamped with the substrate or the first rotating shaft is clamped with the substrate.

[0011] Further, the substrate is provided with mounting holes, and a first elastic member and positioning beads are arranged in the mounting holes. The positioning structure includes two positioning concave holes provided on the back surface of the rotating base, and the two positioning concave holes correspond to the two rotating arms one by one. When the first reflector enters the reflection position, under the push of the first elastic member, a part of the positioning bead enters one of the positioning concave holes. When the second reflector enters the reflection position, under the push of the first elastic member, a part of the positioning bead enters the other positioning concave hole.

[0012] Further, the transmission unit includes an intermediate shaft and a second rotating shaft. The two ends of the intermediate shaft are respectively rotationally connected to the first rotating shaft and the second rotating shaft, and the intermediate shaft can rotate freely relative to the first rotating shaft and the second rotating shaft. A second elastic member is connected between the first rotating shaft and the second rotating shaft, and the second rotating shaft drives the first rotating shaft to rotate through the second elastic member.

[0013] Further, the transmission unit further includes a passive rotating member connected to the second rotating shaft and an active driving member connected to the passive rotating member. The active driving member is connected to the power unit, and the power unit drives the active driving member to act and drives the passive rotating member to rotate.

[0014] Further, a cover body is connected to the back surface of the substrate. The cover body is sleeved outside the first rotating shaft and the intermediate shaft. The cover body is provided with a through hole that cooperates with the second rotating shaft. The second rotating shaft passes through the through hole and is rotationally connected to the cover body. A rotating wheel is connected to the outer end of the second rotating shaft, and a third elastic member is connected between the rotating wheel and the cover body. When the first reflector enters the reflection position, the elastic potential energy of the third elastic member is the smallest. When the second reflector enters the reflection position, the elastic potential energy of the third elastic member is the largest.

[0015] Preferably, the two sides of the cover body are provided with flanges, and the flanges are provided with connecting grooves. The substrate is provided with connecting holes, and a connecting member passes through the connecting grooves and extends into the connecting holes to be connected to the substrate.

[0016] A laser engraving machine includes a frame, and the frame is provided with a first laser emitter that emits a first laser, a second laser emitter that emits a second laser, a front reflector group, and an intermediate reflector. The front reflector includes a first front reflector for reflecting the first laser to the intermediate reflector, a second front reflector for reflecting the second laser to the intermediate reflector, and a front moving mechanism for driving the first front reflector to move. The frame is further provided with an XY moving mechanism, and the XY moving mechanism is connected to a laser engraving head assembly and drives the laser engraving head assembly to move. The laser engraving head assembly includes the above-mentioned lens switching mechanism, and a laser engraving head is connected to the lower end of the front surface of the substrate.

[0017] Further, the front moving mechanism is connected to the lens switching mechanism through a transmission member. The front moving mechanism includes a front linear module and a moving block connected to the front linear module. The front linear module drives the moving block to move horizontally or vertically, and the moving block is connected to the first front mirror; the transmission member includes a wire core and a flexible wire sleeve. The flexible wire sleeve is sleeved outside the wire core, and both ends of the wire core extend out of the flexible wire sleeve. One end of the wire core is connected to the moving block, and the other end of the wire core is wound and connected to a rotating wheel.

[0018] Further, several first intermediate mirrors are provided between the first laser emitter and the first front mirror, and / or several second intermediate mirrors are provided between the second laser emitter and the second front mirror.

[0019] Further, the front linear module includes a vertically arranged vertical plate. A vertical guide rail is provided on the front surface of the vertical plate. The vertical guide rail is connected with a vertical slider, and the vertical slider is connected to the moving block; the lower end of the vertical plate is connected with a motor, the motor is drivingly connected with a lead screw, the lead screw is threadedly connected with a nut block, and the nut block is connected to the moving block.

[0020] Advantages of the present invention: By providing the lens switching mechanism, the present invention can switch and use one of the mirrors in the optical path, which can effectively reduce laser loss and improve the effective utilization rate of the laser. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the principle of the optical path of the laser engraving machine in this embodiment.

[0022] Figure 2 It is the second schematic diagram of the principle of the optical path of the laser engraving machine in this embodiment.

[0023] Figure 3 It is a schematic structural diagram of the laser engraving machine in this embodiment.

[0024] Figure 4 It is a schematic diagram of the cooperation between the lens switching mechanism and the laser engraving head in this embodiment.

[0025] Figure 5 It is Figure 4 Another perspective schematic diagram.

[0026] Figure 6 It is Figure 5 The enlarged schematic diagram at position B in

[0027] Figure 7 It is Figure 4 A schematic structural diagram removing the cover body.

[0028] Figure 8 It is Figure 7 The enlarged schematic diagram at position A in

[0029] Figure 9 This is a schematic structural diagram of the front moving mechanism in this embodiment.

[0030] Figure 10 This is a schematic structural diagram of the positioning structure.

[0031] Reference numerals:

[0032] 1 - Lens switching mechanism; 2 - First reflector; 3 - Second reflector; 4 - Laser engraving head assembly; 5 - Intermediate reflector; 6 - First front reflector; 7 - First laser emitter; 8 - Front moving mechanism; 9 - Second front reflector; 10 - Second laser emitter; 11 - Substrate; 12 - Rotating base; 13 - Rotating arm; 14 - First rotating shaft; 15 - Intermediate shaft; 16 - Second elastic member; 17 - Rotating wheel; 18 - Second rotating shaft; 19 - Cover; 111 - Positioning concave hole; 21 - First intermediate reflector; 22 - Y moving mechanism; 23 - X moving mechanism; 24 - XY moving mechanism; 31 - Positioning bead; 32 - First elastic member; 41 - Laser engraving head; 50 - Frame; 81 - Vertical plate; 82 - Vertical guide rail; 83 - Vertical slider; 84 - Motor; 85 - Lead screw; 86 - Nut block; 87 - Moving block; 100 - Transmission member; 112 - Third elastic member; 191 - Flange; 192 - Connection groove. Detailed implementation manners

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, the following further details this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0035] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0036] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0037] The present invention will be described in detail below with reference to the accompanying drawings. As Figures 1 to 10 shown.

[0038] Embodiment 1: Refer to Figures 4 to 8 ; A lens switching mechanism, which includes: a rotating base 12, a substrate 11, and a first rotating shaft 14. Rotating arms 13 extend outwardly from both sides of the rotating base 12, and a first reflecting mirror 2 and a second reflecting mirror 3 are respectively connected to the outer ends of the two rotating arms 13; the substrate 11 is vertically arranged, and a shaft hole is provided at the upper end of the substrate 11; one end of the first rotating shaft 14 passes through the shaft hole and is fixedly connected to the rotating base 12; and the first rotating shaft 14 is rotatably connected to the substrate 11, and the other end of the first rotating shaft 14 is connected to a power unit through a transmission unit; the power unit drives the first rotating shaft 14 to rotate through the transmission unit and drives the rotating base 12 to rotate, and the first reflecting mirror 2 and the second reflecting mirror 3 can be switched to the reflection position.

[0039] This technical solution is applied to the laser engraving head 41 of a dual-light-source laser engraving machine; the first reflecting mirror 2 corresponds to the first laser of the dual-light-source laser engraving machine, and the second reflecting mirror 3 corresponds to the second laser of the dual-light-source laser engraving machine; during normal operation, the first reflecting mirror 2 is in the reflection position, the first laser is projected onto the first reflecting mirror 2 and is reflected into the laser engraving head 41, and then is focused and projected onto the workpiece; when the dual-light-source laser engraving machine switches to the second laser for operation and the first laser stops, the power unit drives the first rotating shaft 14 to rotate through the transmission unit and drives the rotating base 12 to rotate, and the positions of the first reflecting mirror 2 and the second reflecting mirror 3 on the rotating base 12 change until the second reflecting mirror 3 is in the reflection position; at this time, the second laser is projected onto the second reflecting mirror 3, and the second reflecting mirror 3 reflects the second laser to the laser engraving head 41, and the second laser is projected onto the workpiece through the laser engraving head 41. Both the first reflecting mirror 2 and the second reflecting mirror 3 can be dedicated reflecting mirrors, and the reflectivity corresponding to the first laser and the second laser can reach the lowest or be close to the lowest, thereby effectively saving laser energy and reducing losses. Secondly, when the first rotating shaft 14 is rotatably connected to the substrate 11, a bearing can be provided in the shaft hole, and the first rotating shaft 14 is sleeved with the bearing, so that the first rotating shaft 14 can rotate freely relative to the substrate 11.

[0040] Secondly, a positioning structure is provided between the rotating base 12 and the substrate 11, or a positioning structure is provided between the first rotating shaft 14 and the substrate 11. When the first reflector 2 or the second reflector 3 is in the reflection position, the rotating base 12 is clamped to the substrate 11, or the first rotating shaft 14 is clamped to the substrate 11.

[0041] Since this technical solution is applied to laser processing and has very high requirements for directivity, the rotation position of the rotating base 12 also has very high requirements. In order to enable the first reflector 2 and the second reflector 3 to accurately enter the reflection position, this embodiment adopts the method of setting a positioning structure to position the position of the rotating base 12 or the first rotating shaft 14, thereby positioning the entry of the first reflector 2 or the second reflector 3 into the reflection position to achieve the purpose of accurately reflecting the laser.

[0042] See Figure 10 , the substrate 11 is provided with mounting holes, and a first elastic member 32 and positioning beads 31 are arranged in the mounting holes. The positioning structure includes two positioning concave holes 111 provided on the back surface of the rotating base 12, and the two positioning concave holes 111 correspond to the two rotating arms 13 one by one. When the first reflector 2 enters the reflection position, under the push of the first elastic member 32, a part of the positioning bead 31 enters one of the positioning concave holes 111. When the second reflector 3 enters the reflection position, under the push of the first elastic member 32, a part of the positioning bead 31 enters the other positioning concave hole 111.

[0043] For convenient use, the positioning bead 31 can be spherical, and the positioning concave hole 111 is a spherical crown hole; a part of the above-mentioned positioning bead 31 is less than or equal to one-half of the positioning bead 31, preferably between one-third and one-half. In application, the first rotating shaft 14 drives the rotating base 12 to rotate, and the positioning bead 31 abuts against the rotating base 12 under the push of the first elastic member 32. The positioning bead 31 forms a small resistance to the rotating base 12, which can be ignored. When the first reflector 2 enters the reflection position, the positioning bead 31 is opposite to one of the positioning holes, and a part of the positioning bead 31 enters the positioning hole. The positioning bead 31 forms a clamping connection with the rotating base 12, and the positioning bead 31 forms a large resistance to the rotating base 12. After switching, the first rotating shaft 14 drives the rotating base 12 to reverse, the positioning concave hole 111 is separated from the positioning bead 31, the positioning bead 31 disengages from the positioning concave hole 111 and abuts against the rotating base 12 until the second reflector 3 enters the reflection position, the other positioning concave hole 111 is opposite to the positioning bead 31, and the positioning bead 31 enters the other positioning concave hole 111, and the positioning bead 31 forms a clamping connection with the rotating base 12 again. The first elastic member 32 can be a leaf spring, a spring, rubber, or sponge, etc.

[0044] It can be understood that: only positioning beads 31 can also be provided in the mounting holes; the positioning beads 31 always remain in contact with the rotating base 12; only at this time, the friction between the positioning beads 31 and the rotating base 12 is relatively large, which is not conducive to the free rotation of the rotating base 12.

[0045] The above-mentioned positioning structure is arranged between the rotating base 12 and the substrate 11; when the positioning structure is arranged between the rotating shaft and the substrate 11, mounting holes can be provided on the outer side surface of the rotating shaft, a first elastic member 32 and positioning beads 31 are arranged in the mounting holes, and two positioning concave holes 111 are arranged on the side surface of the shaft hole; the working mode is similar to the above. When the first mirror 2 or the second mirror 3 enters the reflection position, a part of the positioning beads 31 enters the corresponding positioning concave holes 111, and the positioning beads 31 form a clamping connection with the substrate 11.

[0046] See Figure 7 , Figure 8 , the transmission unit includes an intermediate shaft 15 and a second rotating shaft 18. The two ends of the intermediate shaft 15 are respectively rotationally connected to the first rotating shaft 14 and the second rotating shaft 18, and the intermediate shaft 15 can rotate freely relative to the first rotating shaft 14 and the second rotating shaft 18; a second elastic member 16 is connected between the first rotating shaft 14 and the second rotating shaft 18, and the second rotating shaft 18 drives the first rotating shaft 14 to rotate through the second elastic member 16.

[0047] In the transmission unit of this embodiment, an intermediate shaft 15, a second rotating shaft 18, and a second elastic member 16 are adopted. The second rotating shaft 18 is connected to the first rotating shaft 14 through the intermediate shaft 15, and both the second rotating shaft 18 and the first rotating shaft 14 can rotate relative to the intermediate shaft 15, so the rotation of the second rotating shaft 18 is relatively free with respect to the rotation of the first rotating shaft 14. In specific implementation, bearings can be provided at both ends of the intermediate shaft 15 and then sleeved with the first rotating shaft 14 and the second rotating shaft 18; during operation, the second rotating shaft 18 rotates under an external force and drives the first rotating shaft 14 to rotate through the second elastic member 16. Therefore, the first rotating shaft 14 has a delay, and the second elastic member 16 can store energy; when the first mirror 2 enters the reflection position, the rotating base 12 is engaged with the positioning bead 31, the rotating base 12 stops rotating, and the first rotating shaft 14 also stops rotating; the rotation angle of the second rotating shaft 18 can be slightly ahead of the first rotating shaft 14, such as between 0 and 10 degrees ahead, and the second elastic member 16 still maintains a deformed state and has a pulling force or a pushing force on the first rotating shaft 14; and this pulling force or pushing force is not sufficient to drive the rotating base 12 to disengage from the positioning bead 31. When the lens is switched, the second rotating shaft 18 rotates in the reverse direction. In the initial stage, the first rotating shaft 14 remains stationary due to the engagement between the rotating base 12 and the positioning bead 31. When the included angle between the second rotating shaft 18 and the first rotating shaft 14 exceeds a certain degree, such as 30 degrees, the elastic force stored in the second elastic member 16 can overcome the engagement between the rotating base 12 and the positioning bead 31, and the rotating base 12 rotates driven by the first rotating shaft 14, and the rotating base 12 disengages from the positioning bead 31. When the second mirror 3 enters the reflection position, the rotating base 12 is engaged with the positioning bead 31 again, the rotating base 12 stops rotating, and the first rotating shaft 14 also stops rotating; the rotation angle of the second rotating shaft 18 can be slightly ahead of the first rotating shaft 14 again, such as 0 to 10 degrees ahead, and the second elastic member 16 still maintains a deformed state and has a pulling force or a pushing force on the first rotating shaft 14; similarly, this pulling force or pushing force is not sufficient to drive the rotating base 12 to disengage from the positioning bead 31. The rotation range of the second rotating shaft 18 can be larger than that of the first rotating shaft 14; for example, when the included angles between the first mirror 2, the second mirror 3 and the rotation center are 180 degrees, when the first mirror 2 is in the reflection position, the corresponding angle of the position of the first rotating shaft 14 is -90 degrees, and the corresponding angle of the position of the second rotating shaft 18 is -95 to -90 degrees; when the second mirror 3 is in the reflection position, the corresponding angle of the position of the first rotating shaft 14 is 90 degrees, and the corresponding angle of the position of the second rotating shaft 18 is 90 to 95 degrees; the rotation angle of the first rotating shaft 14 is 180 degrees and is precise; the rotation angle of the second rotating shaft 18 is 180 - 190 degrees, which is a relatively wide range of angle values, and the control accuracy can be reduced, thereby reducing costs. The second elastic member 16 can adopt a torsion spring or the like.

[0048] To facilitate driving the rotation of the second rotating shaft 18, the transmission unit further includes a passive rotating member connected to the second rotating shaft 18 and an active driving member connected to the passive rotating member. The active driving member is connected to the power unit, and the power unit drives the active driving member to act and drives the passive rotating member to rotate.

[0049] During power transmission, the power unit drives the active driving member to act, drives the second rotating shaft 18 to rotate through the passive rotating key, and then drives the first rotating shaft 14 and the rotating base 12 to rotate, so as to realize the switching of the first mirror 2 and the second mirror 3 into the reflection position. The passive rotating member can be a passive gear, and the active driving member can be an active gear or an active rack. The active gear or the active rack meshes with the passive gear, and the power unit drives the active gear to rotate and drives the passive gear to rotate; or, the power unit drives the active rack to move and drives the passive gear to rotate; the passive rotating member can also be a passive synchronous pulley, and the active driving member is an active synchronous pulley. The active synchronous pulley drives the passive synchronous pulley to rotate through a synchronous belt. The power unit can generally select a servo motor 84 or a cylinder, etc., and can be selected according to actual needs.

[0050] See Figure 5 、 Figure 6 As shown in, a cover body 19 is connected to the back surface of the substrate 11. The cover body 19 is sleeved outside the first rotating shaft 14 and the intermediate shaft. The cover body 19 is provided with a through hole matching with the second rotating shaft 18. The second rotating shaft 18 passes through the through hole and is rotatably connected to the cover body 19. A rotating wheel 17 is connected to the outer end of the second rotating shaft 18. A third elastic member 112 is connected between the rotating wheel 17 and the cover body 19. When the first mirror 2 enters the reflection position, the elastic potential energy of the third elastic member 112 is the smallest. When the second mirror 3 enters the reflection position, the elastic potential energy of the third elastic member 112 is the largest.

[0051] When the dual-light-source laser engraving machine switches the light source, it also switches the lens at the same time, and some other associated structures will also be switched; in order to make these structures switch synchronously, a linkage structure is generally adopted, and kinetic energy is transmitted through the transmission member 100; at the same time, due to their different positions, in order to facilitate linkage, a retractable wire is generally used for power transmission; in this embodiment, in order to facilitate cooperation with the retractable wire to realize power transmission, the cover body 19, the rotating wheel 17 and the third elastic member 112 are provided; in actual application, one end of the retractable wire can be wound and connected to the rotating wheel 17. When there is power output, the retractable wire moves and drives the rotating wheel 17 to rotate, and at the same time the third elastic member 112 deforms.

[0052] For ease of understanding, the initial state can be set as follows: The first reflector 2 is in the reflection position, one end of the positioning bead 31 is inserted into one of the positioning concave holes 111, the position corresponding angle of the first rotating shaft 14 is -90 degrees; the position corresponding angle of the second rotating shaft 18 can be set to -95 degrees, and the second elastic member 16 retains a small elastic potential energy; the elastic potential energy of the third elastic member 112 is the smallest, and it still maintains the state of pulling the rotating wheel 17. At this time, the second elastic member 16 and the third elastic member 112 maintain the balance of the acting force on the second rotating shaft 18. When the power unit acts on the retracting wire, the retracting wire moves outward to drive the rotating wheel 17 to rotate. The rotating wheel 17 drives the second rotating shaft 18 to rotate. The elastic potential energy of the third elastic member 112 gradually increases. The second rotating shaft 18 exerts a pulling force on the first rotating shaft 14 through the second elastic member 16. The elastic potential energy of the second elastic member 16 first becomes smaller to 0 and then gradually increases. When the elastic potential energy of the second elastic member 16 can overcome the clamping resistance between the positioning bead 31 and the rotating base 12, the first rotating shaft 14 starts to drive the rotating base 12 to rotate; the elastic potential energy of the second elastic member 16 gradually decreases to remain unchanged; when the positioning bead 31 cooperates with another positioning concave hole 111 on the rotating base 12, the first rotating shaft 14 and the rotating base 12 stop rotating, and the position corresponding angle of the first rotating shaft 14 is 90 degrees, that is, the first rotating shaft 14 and the rotating base 12 rotate 180 degrees; the rotating wheel 17 can continue to drive the second rotating shaft 18 to rotate until the position corresponding angle of the second rotating shaft 18 is 95 degrees, etc., that is, the second rotating shaft 18 rotates about 190 degrees, and the second elastic member 16 still maintains a small pulling force; the elastic potential energy of the third elastic member 112 reaches the maximum.

[0053] When the power unit no longer outputs power, the retracting wire is released; the third elastic member 112 releases the elastic potential energy and reduces the deformation, driving the rotating wheel 17 to rotate in the reverse direction. The rotating wheel 17 drives the second rotating shaft 18 to rotate in the reverse direction. The second elastic member 16 also first becomes smaller to 0 and then gradually becomes larger until it is sufficient to overcome the clamping resistance between the positioning bead 31 and the rotating base 12; the second elastic member 16 releases the elastic potential energy, and the first rotating shaft 14 rotates following the second rotating shaft 18 and drives the rotating base 12 to rotate; when the positioning concave hole 111 of the rotating base 12 and the positioning bead 31 are relatively matched again, the first rotating shaft 14 stops rotating, and the second rotating shaft 18 and the rotating wheel 17 continue to rotate a small angle under the reset power of the third elastic member 112, and the second elastic member 16 and the third elastic member 112 reach the balance again; the second rotating shaft 18 and the rotating wheel 17 return to the initial state.

[0054] Secondly, the setting of the cover 19 can assist in supporting the second rotating shaft 18. The second rotating shaft 18 can be directly inserted into the cover 19. To facilitate the relative rotation of the second rotating shaft 18 with respect to the cover 19, a bearing can be provided on the cover 19, and the second rotating shaft 18 is sleeved with the bearing, which can not only support the second rotating shaft 18 but also enable the second rotating shaft 18 to rotate freely. The rotating wheel 17 is located outside the cover 19, and there may be a gap between the rotating wheel 17 and the cover 19. The third elastic member 112 can be a torsion spring or a tension spring; when it is a torsion spring, the torsion spring is sleeved on the second rotating shaft 18, the torsion spring is located in the gap, and one end is connected to the rotating wheel 17 or the second rotating shaft 18, and the other end is connected to the cover 19; when it is a tension spring, the two ends of the tension spring are respectively connected to the cover 19 and the rotating wheel 17. The third elastic member 112 always remains in a deformed state and always exerts a force on the rotating wheel 17, making the rotating wheel 17 maintain a stable state.

[0055] To facilitate the fixing of the cover 19 to the substrate 11, flanges 191 are provided on both sides of the cover 19, and connection grooves 192 are provided on the flanges 191. The substrate 11 is provided with connection holes, and a connecting member passes through the connection groove 192 and extends into the connection hole to connect with the substrate 11.

[0056] The connecting member can be a bolt or a screw, and the cover 19 is fixedly connected to the substrate 11 through the connecting member; at the same time, position fine-tuning can be performed through the connection groove 192, which is convenient to use.

[0057] Embodiment 2: Refer to Figures 1 to 3 and Figure 9 ; A laser engraving machine, including a frame 50, the frame 50 is provided with a first laser emitter 7 that emits a first laser, a second laser emitter 10 that emits a second laser, a front mirror group, and an intermediate mirror 5; the front mirror includes a first front mirror 6 for reflecting the first laser to the intermediate mirror 5, a second front mirror 9 for reflecting the second laser to the intermediate mirror 5, and a front moving mechanism 8 for driving the first front mirror 6 to move; the frame 50 is further provided with an XY moving mechanism 24, the XY moving mechanism 24 is connected to a laser engraving head 41 assembly 4 and drives the laser engraving head 41 assembly 4 to move. The laser engraving head 41 assembly 4 includes the above-mentioned lens switching mechanism 1, and the lower end of the front surface of the substrate 11 is connected to a laser engraving head 41.

[0058] At present, when the dual-light-source laser engraving machine is in use, the first laser is reflected by the first front mirror 6 to the middle mirror 5, and the second laser is reflected by the second front mirror 9 to the middle mirror 5; the first front mirror 6 is located between the second front mirror 9 and the middle mirror 5; after the lens switching mechanism 1 is set, the middle mirror 5 reflects the first laser or the second laser to the corresponding first mirror 2 or second mirror 3; the first mirror 2 and the second mirror 3 switch to reflect the first laser and the second laser correspondingly, reducing the absorption rate of the first laser and the second laser and reducing the loss.

[0059] Secondly, when in use, 1. When the first laser emitter 7 is working, the second laser emitter 10 stops working. The first front mirror 6 is in the working position, and the first mirror 2 is in the reflecting position. The first front mirror 6 reflects the first laser to the middle mirror 5, the middle mirror 5 reflects the first laser to the first mirror 2, and the first mirror 2 reflects the first laser to the laser engraving head 41. 2. When the second laser emitter 10 is working, the first laser emitter 7 stops working. The front moving mechanism 8 moves the first front mirror 6 out of the working position, the lens switching mechanism 1 moves the first front mirror 6 out of the reflecting position, and the second front mirror 9 moves into the reflecting position; the second laser is projected onto the second front mirror 9 and is reflected to the middle mirror 5, and the middle mirror 5 reflects the second laser to the second mirror 3, and the second mirror 3 reflects the second laser to the laser engraving head 41.

[0060] See Figure 3 , the front moving mechanism 8 is connected to the lens switching mechanism 1 through a transmission member 100. The front moving mechanism 8 includes a front linear module and a moving block 87 connected to the front linear module. The front linear module drives the moving block 87 to move horizontally or vertically, and the moving block 87 is connected to the first front mirror 6; the transmission member 100 includes a wire core and a flexible wire sleeve. The flexible wire sleeve is sleeved outside the wire core. The two ends of the wire core extend out of the flexible wire sleeve. One end of the wire core is connected to the moving block 87, and the other end of the wire core is wound and connected to the rotating wheel 17.

[0061] The transmission member 100 is a transmission unit, and the front moving mechanism 8 is a power unit; while the front moving mechanism 8 drives the first front mirror 6 to move, it also drives the lens switching mechanism 1 to act. In this embodiment, a front linear module is used to drive the moving block 87 to move, and the moving block 87 drives the first front mirror 6 to move linearly; it can be understood that: the front linear module can drive the moving block 87 to perform horizontal movements in various directions such as lateral, longitudinal, and sideward, and can also drive the moving block 87 to move in directions such as vertical and inclined. The front linear module can adopt structures such as a cylinder and a linear motor 84. In practical applications, the front linear module is fixed to the frame 50, and the laser engraving head 41 is connected to the XY moving mechanism 24. The XY moving mechanism 24 includes a Y moving mechanism 22 and an X moving mechanism 23 connected to the Y moving mechanism 22. The laser engraving head 41 is connected to the X moving mechanism 23. The laser engraving head 41 can move in multiple directions such as the X and Y directions under the drive of the XY moving mechanism 24. Therefore, the distance between the moving block 87 and the laser engraving head 41 changes greatly, and the distance between the moving block 87 and the lens switching mechanism 1 also changes greatly; the transmission member 100 is connected between the moving block 87 and the lens switching mechanism 1. How can the movement of the moving block 87 drive the lens switching of the lens switching mechanism 1; in this embodiment, the transmission member 100 adopts a combination of a core wire and a flexible wire sleeve; among them, the flexible wire sleeve includes at least two parts, one part is laid along the moving direction of the Y moving mechanism 22, and one part is laid along the moving direction of the X moving mechanism 23. It can be understood that: in order to facilitate laying, an X drag chain and a Y drag chain can be set, and the flexible wire sleeve is connected to the drag chain; when the XY moving mechanism 24 drives the laser engraving head 41 to move, the corresponding X drag chain or / and Y drag chain follows the laser engraving head 41 to move; when laser switching is performed, the moving block 87 pulls the core wire to move, the core wire moves relative to the flexible wire sleeve, and the core wire pulls the rotating wheel 17 to rotate, and the lens switching mechanism 1 starts to perform lens switching. When laser switching is performed again, the moving block 87 releases the core wire, and the rotating wheel 17 pulls back and rotates under the reset elastic force of the third elastic member 112. The rotating wheel 17 pulls the core wire to move and reset. The overall structure is simple and convenient.

[0062] Secondly, in this embodiment, there are 2 Y moving mechanisms 22 provided on the frame 50, and the X moving mechanism 23 is arranged between the 2 Y moving mechanisms 22. Both the Y moving mechanism 22 and the X moving mechanism 23 can adopt linear modules, such as: linear motor 84, lead screw nut, cylinder, etc. In this embodiment, a combination of a synchronous belt transmission mechanism and a slider is adopted. The synchronous belt transmission mechanism includes synchronous belt wheels located on both sides. One of the synchronous belt wheels is drivingly connected to the servo motor 84, and the two synchronous belt wheels are connected by a synchronous belt. One side of the synchronous belt is connected to the slider and drives the slider to move linearly. The flexible wire sleeve can adopt a plastic pipe, a rubber pipe, etc., and the core wire can adopt a metal wire such as a steel wire or an iron wire.

[0063] See Figure 1, Figure 2 Between the first laser emitter 7 and the first front mirror 6, a plurality of first intermediate mirrors 21 are provided, or / and, between the second laser emitter 10 and the second front mirror 9, a plurality of second intermediate mirrors are provided.

[0064] When setting the positions of the first laser emitter 7 and the second laser emitter 10, the positions can be set according to actual needs. Between the first laser emitter 7 and the first front mirror 6, a plurality of first intermediate mirrors 21 can be provided so that the first laser is projected onto the first front mirror 6 in a predetermined direction. Similarly, between the second laser emitter 10 and the second front mirror 9, a plurality of second intermediate mirrors can be provided as needed.

[0065] See Figure 9 , the front linear module includes a vertical plate 81 arranged vertically. On the front surface of the vertical plate 81, a vertical guide rail 82 is provided. The vertical guide rail 82 is connected with a vertical slider 83, and the vertical slider 83 is connected with a moving block 87; the lower end of the vertical plate 81 is connected with a motor 84, the motor 84 is drivingly connected with a lead screw 85, the lead screw 85 is threadedly connected with a nut block 86, and the nut block 86 is connected with the moving block 87.

[0066] In this embodiment, the front linear module adopts a lead screw-nut structure arranged vertically. The motor 84 drives the lead screw 85 to rotate, and drives the nut block 86 to move up and down. The nut block 86 is connected with the moving block 87 and drives the moving block 87 to move up and down, so as to achieve the purpose of driving the first front mirror 6 to move up and down. Secondly, by providing the vertical guide rail 82 and the vertical slider 83, when the moving block 87 moves up and down, it is pulled by the vertical slider 83 and can move up and down accurately, avoiding shaking. It can be understood that the lead screw-nut structure can also be arranged horizontally to drive the moving block 87 to move horizontally. Of course, the moving block 87 can also be driven to rotate, such as through the cooperation of the rotating motor 84 and the rotating table, to drive the moving block 87 to rotate.

[0067] Secondly, since the front linear module not only drives the first front mirror 6 to move, but also drives the lens switching mechanism 1 through the transmission member 100, the moving distance of the front linear module driving the moving block 87 is equal to the distance that the core wire needs to move and corresponds to the rotation angle of the rotating wheel 17; to ensure that the lens switching mechanism 1 can complete the switching action. Secondly, since the position of the second front mirror 9 remains unchanged all the time, for convenience of setting, the second front mirror 9 can be fixed to the vertical plate 81; of course, it can also be fixed to the frame 50.

[0068] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A lens switching mechanism, characterized in that: It includes: A rotating base, with rotating arms extending outwardly from both sides of the rotating base, and a first reflecting mirror and a second reflecting mirror are respectively connected to the outer ends of the two rotating arms; A substrate, arranged vertically, with a shaft hole provided at the upper end; A first rotating shaft, one end of which passes through the shaft hole and is fixedly connected to the rotating base; the first rotating shaft is rotatably connected to the substrate, and the other end of the first rotating shaft is connected to a power unit through a transmission unit; The power unit drives the first rotating shaft to rotate through the transmission unit and drives the rotating base to rotate, and the first reflecting mirror and the second reflecting mirror can be switched to the reflecting position; A positioning structure is provided between the rotating base and the substrate, and when the first reflecting mirror or the second reflecting mirror is in the reflecting position, the rotating base is clamped with the substrate; The substrate is provided with a mounting hole, in which a first elastic member and a positioning bead are provided. The positioning structure includes two positioning concave holes provided on the back surface of the rotating base, and the two positioning concave holes correspond to the two rotating arms one by one; when the first reflecting mirror enters the reflecting position, under the push of the first elastic member, a part of the positioning bead enters one of the positioning concave holes; when the second reflecting mirror enters the reflecting position, under the push of the first elastic member, a part of the positioning bead enters the other positioning concave hole; The transmission unit includes an intermediate shaft and a second rotating shaft, the two ends of the intermediate shaft are respectively rotatably connected to the first rotating shaft and the second rotating shaft, and the intermediate shaft can rotate freely relative to the first rotating shaft and the second rotating shaft; a second elastic member is connected between the first rotating shaft and the second rotating shaft, and the second rotating shaft drives the first rotating shaft to rotate through the second elastic member; A cover body is connected to the back surface of the substrate, and the cover body is sleeved outside the first rotating shaft and the intermediate shaft. The cover body is provided with a through hole that cooperates with the second rotating shaft, and the second rotating shaft passes through the through hole and is rotatably connected to the cover body. A rotating wheel is connected to the outer end of the second rotating shaft, and a third elastic member is connected between the rotating wheel and the cover body. When the first reflecting mirror enters the reflecting position, the elastic potential energy of the third elastic member is the smallest, and when the second reflecting mirror enters the reflecting position, the elastic potential energy of the third elastic member is the largest.

2. The lens switching mechanism according to claim 1, characterized in that: The transmission unit further includes a passive rotating member connected to the second rotating shaft and an active driving member connected to the passive rotating member, and the active driving member is connected to the power unit. The power unit drives the active driving member to act and drives the passive rotating member to rotate.

3. The lens switching mechanism according to claim 1, wherein: Flanging portions are provided on both sides of the cover body, and connecting grooves are provided on the flanging portions. The substrate is provided with connecting holes, and a connecting member passes through the connecting groove and extends into the connecting hole to be connected to the substrate.

4. A laser engraving machine, comprising a frame, the frame is provided with a first laser emitter for emitting a first laser, a second laser emitter for emitting a second laser, a front mirror group and an intermediate mirror; the front mirror includes a first front mirror for reflecting the first laser to the intermediate mirror, a second front mirror for reflecting the second laser to the intermediate mirror, and a front moving mechanism for driving the first front mirror to move; the frame is further provided with an XY moving mechanism, the XY moving mechanism is connected to a laser engraving head assembly and drives the laser engraving head assembly to move, and is characterized in that: The laser engraving head assembly includes the lens switching mechanism according to claim 1, and a laser engraving head is connected to the lower end of the front surface of the substrate.

5. The laser engraving machine according to claim 4, wherein: The front moving mechanism is connected to the lens switching mechanism through a transmission member. The front moving mechanism includes a front linear module and a moving block connected to the front linear module. The front linear module drives the moving block to move horizontally or vertically, and the moving block is connected to a first front reflecting mirror; the transmission member includes a wire core and a flexible wire sleeve. The flexible wire sleeve is sleeved outside the wire core, and both ends of the wire core extend out of the flexible wire sleeve. One end of the wire core is connected to the moving block, and the other end of the wire core is wound and connected to the rotating wheel.

6. The laser engraving machine according to claim 4, characterized in that: A plurality of first intermediate reflecting mirrors are provided between the first laser emitter and the first front reflecting mirror, and / or a plurality of second intermediate reflecting mirrors are provided between the second laser emitter and the second front reflecting mirror.

7. The laser engraving machine according to claim 5, characterized in that: The front linear module includes a vertical plate arranged vertically. A vertical guide rail is provided on the front surface of the vertical plate. The vertical guide rail is connected with a vertical slider, and the vertical slider is connected with a moving block. The lower end of the vertical plate is connected with a motor, the motor is drivingly connected with a lead screw, the lead screw is in threaded connection with a nut block, and the nut block is connected with the moving block.

Images