A dual-light-source laser engraving machine

Abstract

The present invention relates to the technical field of laser processing, and particularly to a dual-source laser engraving machine. It includes a frame, on which there are two laser emitters, a front mirror assembly, a laser engraving head, and an intermediate mirror unit; the two laser emitters respectively emit a first laser and a second laser; the front mirror assembly includes a first front mirror and a second front mirror, and a displacement mechanism for changing the position of the first front mirror or / and the second front mirror; the intermediate mirror unit includes a first intermediate mirror and a second intermediate mirror, and further includes a switching mechanism for switching the positions of the first intermediate mirror and the second intermediate mirror; the displacement mechanism is connected to the switching mechanism through a transmission unit and acts synchronously. The intermediate mirror unit of the present invention can effectively reduce the loss of the laser and improve the utilization rate by setting the ability to switch the first front mirror and the second front mirror.

Description

Technical Field

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

[0002] Currently, a laser engraving machine generally includes a laser emitter, a laser reflection system, and a laser engraving head. The laser reflection system reflects the laser emitted by the laser emitter to the laser engraving head, and the laser reflection system is composed of multiple laser reflectors. As is well known, when a reflector reflects laser light, a part of the laser light is absorbed by the reflector, and the absorption rates of lasers with different wavelengths on reflectors made of the same material are also different.

[0003] Secondly, at present, some laser engraving machines use dual-source lasers to cope with a wider range of material processing. The two laser wavelengths of the dual-source lasers are relatively different, but the two lasers share a set of laser reflection systems. In order to take into account the absorption rates of the two lasers by the reflector material, the reflector material generally uses a material with relatively low absorption efficiency for both lasers, resulting in relatively low utilization rates of both lasers. If one of the reflectors in the laser reflection system can be replaced with two switchable reflectors, and the two switchable reflectors correspond to the two lasers one by one and both have relatively low or the lowest absorption rates, the utilization rates of the two lasers can be effectively improved and the energy loss can be reduced. Summary of the Invention

[0004] The purpose of the present invention is to provide a dual-source laser engraving machine in view of the deficiencies of the prior art. In this dual-source laser engraving machine, one of the reflectors in the original laser reflection system is replaced with two switchable reflectors, which can effectively improve the utilization rate of the laser.

[0005] A dual-source laser engraving machine includes a frame, on which there are two laser emitters, a front reflector assembly, a laser engraving head, and an intermediate reflector unit.

[0006] The two laser emitters respectively emit a first laser and a second laser outward.

[0007] The front reflector assembly includes a first front reflector and a second front reflector that respectively reflect the first laser and the second laser in the same direction to the intermediate reflector unit, and a displacement mechanism for changing the position of the first front reflector or / and the second front reflector.

[0008] The intermediate reflector unit includes a first intermediate reflector and a second intermediate reflector for respectively reflecting the first laser and the second laser to the laser engraving head, and also includes a switching mechanism for switching the positions of the first intermediate reflector and the second intermediate reflector.

[0009] The displacement mechanism is connected to the switching mechanism through a transmission unit and operates synchronously.

[0010] Further, the displacement mechanism includes a moving device and a rotating device connected to the first front mirror.

[0011] Further, the moving device includes a guide rail and a linear module arranged horizontally or vertically. The guide rail is slidably connected with a guiding slider, the guiding slider is connected to the first front mirror, and the linear module is connected to the first front mirror and drives the first front mirror to move along the guide rail.

[0012] Further, the switching mechanism includes:

[0013] A substrate;

[0014] A rotating disk, whose upper surface is connected to the first intermediate mirror and the second intermediate mirror. The first intermediate mirror and the second intermediate mirror are arranged at intervals.

[0015] A rotating sleeve, whose lower end is open and upper end is fixedly connected to the rotating disk;

[0016] A rotating shaft, whose upper end is rotatably connected to the rotating sleeve. The rotating shaft can freely rotate relative to the rotating sleeve; the rotating shaft is connected to the displacement mechanism through a transmission unit; the lower end of the rotating shaft is rotatably connected to the substrate;

[0017] An elastic transmission unit, connected between the rotating sleeve and the rotating shaft;

[0018] A positioning unit, connected to the rotating disk or the rotating sleeve. A clamping structure is provided between the positioning unit and the rotating disk or the rotating sleeve. When the first intermediate mirror or the second intermediate mirror is in the intermediate reflection position, the positioning unit is clamped with the rotating disk or the rotating sleeve.

[0019] Further, a shaft hole matching the rotating shaft is provided in the middle of the upper bottom plate of the rotating sleeve. The upper end of the rotating shaft is inserted into the shaft hole. N inner convex blocks extend inward from the inner side surface of the rotating sleeve, and N outer convex blocks extend outward from the side surface of the rotating shaft. The outer convex blocks and the inner convex blocks are arranged in a staggered manner. The elastic transmission unit includes a transmission spring, which is arranged between two adjacent inner convex blocks and outer convex blocks, and both ends of the transmission spring are respectively abutted against the corresponding inner convex block and outer convex block. N is a natural number.

[0020] Further, the positioning unit includes a positioning sleeve, which is connected to the substrate and sleeved on the outside of the rotating sleeve. The upper end surface of the positioning sleeve abuts against or has a gap with the lower end surface of the rotating disk. Two positioning holes are provided on the lower end surface of the rotating disk, and at least one mounting hole is provided on the upper end surface of the positioning sleeve. A spring and a positioning ball are arranged in the mounting hole, and the positioning ball is located above the spring; when the rotating disk rotates to the position where the first intermediate mirror or the second intermediate mirror is in the intermediate reflection position, the upper end of at least one positioning ball is inserted into a corresponding positioning hole and forms a clamping connection.

[0021] Preferably, several connecting columns extend downward from the lower end of the positioning sleeve. The substrate is provided with connecting holes that cooperate with the positioning columns, and the connecting columns are inserted into the connecting holes.

[0022] Furthermore, the frame is provided with an XY moving mechanism for driving the laser engraving head to move. The XY moving mechanism includes an X moving mechanism and a Y moving mechanism that are connected to each other. The Y moving mechanism drives the X moving mechanism to move longitudinally, and the X moving mechanism is connected to the laser engraving head and drives the laser engraving head to move horizontally; the intermediate mirror unit is arranged on the X moving mechanism; the transmission unit includes a flexible sleeve, a connecting wire is arranged inside the flexible sleeve, the flexible sleeve is connected to the frame, one end of the connecting wire is connected to the displacement mechanism, and the other end of the connecting wire is connected to the switching mechanism.

[0023] Furthermore, the rotating shaft is connected with a rotating wheel, the rotating wheel is wound and connected with one end of the connecting wire, and the rotating wheel or the rotating shaft is connected with a reset elastic member for driving the rotating shaft to reset.

[0024] Preferably, the reset elastic member includes a tension spring. One end of the tension spring is connected to the substrate or the positioning sleeve, and the other end of the tension spring is connected to the rotating wheel or the rotating shaft.

[0025] The beneficial effects of the present invention: By arranging the intermediate mirror unit of the present invention to be able to switch between the first front mirror and the second front mirror, the loss of the laser can be effectively reduced and the utilization rate can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the optical path transmission principle of a dual-light-source laser engraving machine according to this embodiment.

[0027] Figure 2 It is a second schematic diagram of the optical path transmission principle of a dual-light-source laser engraving machine according to this embodiment.

[0028] Figure 3 It is a schematic structural diagram of a dual-light-source laser engraving machine according to this embodiment.

[0029] Figure 4 It is Figure 3 a schematic structural diagram of another perspective in

[0030] Figure 5 It is a schematic structural diagram of an intermediate mirror unit according to this embodiment.

[0031] Figure 6 It is Figure 5 a schematic structural diagram excluding the positioning sleeve.

[0032] Figure 7 It is a schematic diagram of the cooperation of the rotating disk, the rotating sleeve, the elastic transmission unit and the rotating shaft.

[0033] Figure 8 is Figure 7 a schematic diagram of a decomposition structure of

[0034] Figure 9 is Figure 8 a schematic diagram of another perspective of

[0035] Figure 10 is a schematic diagram of a structure of the positioning sleeve in this embodiment.

[0036] Figure 11 is a schematic diagram of a structure of the front mirror assembly in this embodiment.

[0037] Figure 12 is Figure 11 a schematic diagram of another perspective of

[0038] Reference numerals:

[0039] 1 - frame; 2 - second laser emitter; 3 - front mirror assembly; 4 - intermediate mirror; 5 - first laser emitter; 6 - intermediate mirror unit; 7 - XY moving mechanism; 8 - laser engraving head; 9 - transmission unit;

[0040] 31 - first front mirror; 32 - second front mirror; 33 - lead screw motor; 34 - first front connecting frame; 35 - lead screw; 36 - guide rail; 37 - guide slider; 38 - vertical plate; 39 - nut block; 310 - second front connecting frame;

[0041] 61 - first intermediate mirror; 62 - second intermediate mirror: 63 - rotating disk; 64 - positioning sleeve; 65 - rotating sleeve; 66 - reset elastic member; 67 - rotating wheel; 68 - substrate; 69 - rotating shaft; 610 - elastic transmission unit;

[0042] 631 - positioning hole; 632 - insertion post; 641 - connecting post; 642 - positioning ball;

[0043] 651 - inner convex block; 652 - shaft hole; 691 - outer convex block;

[0044] 71 - Y moving mechanism; 72 - X moving mechanism. Detailed implementation manners

[0045] In order to make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following further elaborates on this application in conjunction with the 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.

[0046] 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.

[0047] 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 drawings, and is only for the convenience of describing the present 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 of the present application.

[0048] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0049] The present invention will be described in detail below with reference to the accompanying drawings. As Figures 1 to 12 shown.

[0050] Embodiment 1: Refer to Figures 1 to 4 ; A dual-light-source laser engraving machine, which includes a frame 1. The frame 1 is provided with two laser emitters, a front mirror assembly 3, a laser engraving head 8, and an intermediate mirror unit 6;

[0051] The two laser emitters respectively emit first laser and second laser outward;

[0052] The front mirror assembly 3 includes a first front mirror 31 and a second front mirror 32 that respectively reflect the first laser and the second laser in the same direction to the intermediate mirror unit 6, and a displacement mechanism for changing the position of the first front mirror 31 or / and the second front mirror 32;

[0053] The intermediate mirror unit 6 includes: a first intermediate mirror 61 and a second intermediate mirror 62 for respectively reflecting the first laser and the second laser to the laser engraving head 8, and further includes a switching mechanism for switching the positions of the first intermediate mirror 61 and the second intermediate mirror 62;

[0054] The displacement mechanism is connected to the switching mechanism through a transmission unit and operates synchronously.

[0055] When the dual-light-source laser engraving machine of this embodiment is specifically set, the two laser emitters are emitters of two different wavelengths of laser, such as: a semiconductor radio frequency laser emitter and a carbon dioxide laser emitter; the two laser emitters can be set at different positions on the frame 1, or can be set at adjacent positions; for example: when set at adjacent positions, the first laser and the second laser are projected onto the first front mirror 31 and the second front mirror 32 in a parallel manner, see Figure 1 ; the first front mirror 31 and the second front mirror 32 are also adjacently arranged, the first front mirror 31 is located between the second front mirror 32 and the middle mirror unit 6, or, the second front mirror 32 is located between the first front mirror 31 and the middle mirror unit 6.

[0056] The two laser emitters are respectively the first laser emitter 5 and the second laser emitter 2; in the initial state, the first front mirror 31 is located at the first front reflection position, and the first front mirror 31 can reflect the first laser to the middle mirror unit 6; the second front mirror 32 can be located at the second front reflection position, or can be located at other positions. The first middle mirror 61 of the middle mirror unit 6 is located at the middle reflection position, and the second middle mirror 62 is located on one side of the first middle mirror 61; at this time, the first laser emitter 5 works and emits the first laser, and the second laser emitter 2 does not work. The first laser can be directly projected onto the first front mirror 31, and is reflected by the first front mirror 31 to the first middle mirror 61, and then is reflected by the first middle mirror 61 to the laser engraving head 8.

[0057] When the second laser emitter 2 works, the first laser emitter 5 does not work; at the same time, the displacement mechanism and the switching mechanism act simultaneously. The displacement mechanism moves the first front mirror 31 out of the first front reflection position. If the second front mirror 32 is not at the second front reflection position, the second front mirror 32 is simultaneously moved to the second front reflection position; the switching mechanism moves the first middle mirror 61 out of the middle reflection position, and at the same time moves the second middle mirror 62 into the middle reflection position; at this time, the second front mirror 32 reflects the second laser to the second middle mirror 62, and the second middle mirror 62 then reflects the second laser to the laser engraving head 8.

[0058] The displacement mechanism and the switching mechanism are linked. When implemented, it can be that the displacement mechanism drives the switching mechanism to act, or it can be that the switching mechanism drives the displacement mechanism to act. A transmission unit 9 or a transmission mechanism is provided between the displacement mechanism and the switching mechanism.

[0059] When switching back to the first laser emitter 5 for operation, the second laser emitter 2 stops working; the displacement mechanism moves the first front mirror 31 into the first front reflection position; the second front mirror 32 can be moved; or it can remain unmoved; the switching mechanism moves the first intermediate mirror 61 into the intermediate reflection position and moves the second intermediate mirror 62 out of the intermediate reflection position. The first front mirror 31 and the first intermediate mirror 61 cooperate to reflect the first laser to the laser engraving head 8.

[0060] See Figure 2 , the frame 1 is provided with a plurality of intermediate mirrors 4 for assisting the first laser to be projected from the first laser emitter 5 to the first front mirror 31, and / or for assisting the second laser to be projected from the second laser emitter 2 to the second front mirror 32.

[0061] When the first laser emitter 5 and the second laser emitter 2 are located at different positions on the frame 1, the first laser emitter 5 or / and the second laser emitter 2 can reflect the first laser or the second laser to the corresponding first front mirror 31 and second front mirror 32 through a plurality of intermediate mirrors 4. As Figure 2 shown, the first laser emitted by the first laser emitter 5 is reflected to the first front mirror 31 through the intermediate mirror 4.

[0062] Secondly, the displacement mechanism includes a moving device and a rotating device connected to the first front mirror 31.

[0063] The displacement mechanism is mainly used to drive the first front mirror 31 to move into or out of the first front reflection position; as for the second front mirror 32, the displacement mechanism can drive it to move into or out of the second front reflection position; or it can not drive its movement, and the second front mirror 32 can always remain in the second front reflection position. When changing the position of the first front mirror 31, a moving device or a rotating device can be used; for example, a linear module is used to drive the first front mirror 31 to perform linear movement; a rotating motor or the like is used to drive the first front mirror 31 to rotate.

[0064] See Figure 11 , Figure 12 , the moving device includes a guide rail 36 arranged horizontally or vertically and a linear module. The guide rail 36 is slidably connected with a guide slider 37. The guide slider 37 is connected to the first front mirror 31, and the linear module is connected to the first front mirror 31 and drives the first front mirror 31 to move along the guide rail 36.

[0065] The mobile device is used to move the first front reflector 31 out of or into the first front reflection position; in this embodiment, when it is set, the mobile device is provided with a bracket, the bracket includes a vertical plate 38, a guide rail 36 and a linear module are all fixed to the vertical plate 38, the first front reflector 31 and the second front reflector 32 are respectively connected with a first front connecting frame 34 and a second front connecting frame 310, and the second front connecting frame 310 is fixed to the vertical plate 38, so that the second front reflector 32 is fixed to the vertical plate 38. During the whole processing process, the position of the second front reflector 32 remains unchanged. The first front connecting frame 34 is respectively connected with the linear module and the guiding slider 37.

[0066] By setting the linear module to drive the first front reflector 31 to move up and down or horizontally along the guide rail 36. The linear module can be a cylinder, a linear motor, etc.; in this embodiment, the linear module adopts a lead screw motor 33, the servo motor drives the lead screw 35 to rotate, the length direction of the lead screw 35 is the same as the direction of the guide rail 36, which can be the vertical direction, the lead screw 35 is connected with a nut block 39, and the nut block 39 is respectively connected with the guiding slider 37 and the first front connecting frame 34.

[0067] See Figures 5 to 9 , the switching mechanism includes: a substrate 68, a rotating disk 63, a rotating sleeve 65, a rotating shaft 69, an elastic transmission unit 610 and a positioning unit; the upper surface of the rotating disk 63 is connected with a first intermediate reflector 61 and a second intermediate reflector 62, and the first intermediate reflector 61 and the second intermediate reflector 62 are arranged at intervals; the lower end of the rotating sleeve 65 is open, and the upper end of the rotating sleeve 65 is fixedly connected with the rotating disk 63; the upper end of the rotating shaft 69 is rotatably connected with the rotating sleeve 65, and the rotating shaft 69 can rotate freely relative to the rotating sleeve 65; the rotating shaft 69 is connected with the displacement mechanism through the transmission unit; the lower end of the rotating shaft 69 is rotatably connected with the substrate 68; the elastic transmission unit 610 is connected between the rotating sleeve 65 and the rotating shaft 69; the positioning unit is connected with the rotating disk 63 or the rotating sleeve 65, and a clamping structure is arranged between the positioning unit and the rotating disk 63 or the rotating sleeve 65. When the first intermediate reflector 61 or the second intermediate reflector 62 is in the intermediate reflection position, the positioning unit is clamped with the rotating disk 63 or the rotating sleeve 65.

[0068] The switching mechanism is used to switch the first intermediate mirror 61 and the second intermediate mirror 62 to the intermediate reflection position; the rotation axis 69 of the switching mechanism is connected to the displacement mechanism through a transmission unit, so that the action of the switching mechanism is synchronized with the action of the displacement mechanism; both the switching mechanism and the displacement mechanism can be the active mechanism and the driven mechanism. In this embodiment, the displacement mechanism is set as the active mechanism. After the displacement mechanism acts, it will drive the rotation axis 69 to rotate through the transmission unit; of course, the switching mechanism can also be used as the active mechanism. For example, the rotation axis 69 is connected to the drive motor through a transmission mechanism, and the drive motor drives the rotation axis 69 to rotate and drives the displacement mechanism to act through the transmission unit 9. In this embodiment, the displacement mechanism drives the rotation axis 69 to rotate through the transmission unit 9, the rotation axis 69 drives the rotating sleeve 65 to rotate through the elastic transmission unit 610, and the rotating sleeve 65 drives the rotating disk 63 to rotate; when the rotation axis 69 rotates to the first predetermined position and stops, then the first intermediate mirror 61 or the second intermediate mirror 62 then also enters the intermediate reflection position. Since the rotating disk 63 is connected to the rotating sleeve 65, the two rotate synchronously; when positioning the first intermediate mirror 61 or the second intermediate mirror 62 to enter the intermediate reflection position, whether it is positioning the rotating disk 63 or the rotating sleeve 65, the effect is the same. In this embodiment, the rotating disk 63 is used for positioning; when positioning is required, the positioning unit is clamped with the rotating disk 63, and the rotating disk 63 and the rotating sleeve 65 stop rotating. At this time, the rotation angle of the rotation axis 69 can be slightly larger than the rotation angle of the rotating sleeve 65, such as about 0 to 10 degrees, specifically 1, 2, 3, 4, 5, 6 degrees, etc. The elastic transmission unit 610 between the rotation axis 69 and the rotating sleeve 65 still maintains a weak elastic force, and this elastic force cannot drive the rotating sleeve 65 to rotate. Of course, the rotation angle of the rotation axis 69 and the rotation angle of the rotating sleeve 65 can also be equal.

[0069] When the switching mechanism needs to perform a switching action, the rotation axis 69 rotates in the reverse direction. When the rotation axis 69 rotates in the reverse direction by a certain angle, such as 20 or 30 degrees, the elastic force accumulated by the elastic transmission unit 610 can overcome the clamping resistance between the positioning unit and the rotating disk 63, and the positioning unit releases the rotating disk 63. The rotating disk 63 and the rotating sleeve 65 start to rotate along with the rotation axis 69. The rotation axis 69 rotates to the second predetermined position and stops, and the rotating disk 63 continues to rotate until the second intermediate mirror 62 or the first intermediate mirror 61 enters the intermediate reflection position. The rotating disk 63 is clamped with the positioning unit. At this time, the rotation angle of the rotation axis 69 can be slightly larger than the rotation angle of the rotating sleeve 65, such as about 0 to 10 degrees, specifically 1, 2, 3, 4, 5, 6, etc. The elastic transmission unit 610 between the rotation axis 69 and the rotating sleeve 65 still maintains a weak elastic force, and this elastic force cannot drive the rotating sleeve 65 to rotate. Of course, the rotation angle of the rotation axis 69 and the rotation angle of the rotating sleeve 65 can also be equal.

[0070] The elastic transmission unit 610 and the positioning unit are provided to ensure that the first intermediate mirror 61 or the second intermediate mirror 62 on the rotating disk 63 can accurately enter the intermediate reflection position. At the same time, the setting of the elastic transmission unit 610 also reduces the precision control requirement for the rotation angle of the rotating shaft 69. When the switching mechanism switches, the rotation angle of the rotating shaft 69 can be within a certain range. In practical applications, due to the long distance, the transmission unit 9 generally uses wires or ropes made of metal materials; and the wires and ropes themselves have a certain degree of ductility or extensibility. After long-term operation, the length of the wires and ropes increases, which will lead to a decrease in the transmission accuracy; after the elastic transmission unit 610 is set, the rotation angle of the rotating shaft 69 can exceed the rotation angle of the rotating disk 63 to make up for the increase in the length of the transmission unit 9. That is, in the operation, the moving distance of the transmission unit 9 can be appropriately increased to ensure that the rotating disk 63 can rotate to the predetermined position.

[0071] Secondly, it should be noted that: a transmission mechanism can be connected to the middle of the transmission unit 9 to adjust the different moving strokes at both ends of the transmission unit 9; in practical applications, one end of the transmission unit 9 moves along with the movement of the first front mirror 31, and the other end of the transmission unit 9 needs to drive the rotation of the rotating shaft 69. The moving distances at both ends may vary greatly. To adjust the movement at both ends, a transmission mechanism can be set, and the transmission ratio of the transmission mechanism is used to adjust the strokes at both ends. For example, by connecting a gear transmission mechanism, through the transmission of gears with different diameters, the moving stroke can be enlarged or reduced, and thus the rotation angle of the rotating shaft 69 can be adjusted. Another example is to use a lever as the transmission, and use the stroke difference of the displacements at both ends of the lever to adjust the rotation angle of the rotating shaft 69. The rotational connections in this application all mean that the two connected objects can rotate relatively freely.

[0072] See Figure 8 and Figure 9 , a shaft hole 652 matching the rotating shaft 69 is provided in the middle of the upper bottom plate of the rotating sleeve 65. The upper end of the rotating shaft 69 is inserted into the shaft hole 652. N inner convex blocks 651 extend inward from the inner side surface of the rotating sleeve 65, and N outer convex blocks 691 extend outward from the side surface of the rotating shaft 69. The outer convex blocks 691 and the inner convex blocks 651 are arranged in a staggered manner. The elastic transmission unit 610 includes a transmission spring, and the transmission spring is arranged between two adjacent inner convex blocks 651 and outer convex blocks 691, and both ends of the transmission spring are respectively abutted against the corresponding inner convex blocks 651 and outer convex blocks 691, and N is a natural number.

[0073] The elastic drive unit 610 is used to transmit torque. In this embodiment, a combination of a drive spring, an inner convex block 651, and an outer convex block 691 is adopted to transmit the torque of the rotating shaft 69 to the rotating sleeve 65. This structure enables the drive spring to use a material with relatively low quality requirements to meet the requirements of a relatively high elastic modulus, and drives rotation through linear elastic deformation, thus simplifying the structure. During operation, the rotating shaft 69 rotates relative to the rotating sleeve 65 first, the distance between the outer convex block 691 and the inner convex block 651 increases, and the drive spring between the inner convex block 651 and the outer convex block 691 deforms. The drive spring applies a pulling force to the inner convex block 651, and under the action of the pulling force, the inner convex block 651 drives the rotating sleeve 65 to rotate. It can be understood that the elastic drive unit 610 can also adopt other elastic elements, such as torsion springs, etc.

[0074] To facilitate the connection between the rotating sleeve 65 and the rotating disk 63, a plug post 632 is provided at the lower end of the rotating disk 63, and a jack is provided at the upper end of the rotating sleeve 65. The plug post 632 is connected to the jack in an interference fit manner. Of course, other methods can also be adopted, such as bonding, welding, etc.

[0075] See Figure 5 , Figure 8 and Figure 10 , the positioning unit includes a positioning sleeve 64. The positioning sleeve 64 is connected to the substrate 68 and sleeved outside the rotating sleeve 65. The upper end surface of the positioning sleeve 64 abuts against or has a gap with the lower end surface of the rotating disk 63. Two positioning holes 631 are provided on the lower end surface of the rotating disk 63, and at least one mounting hole is provided on the upper end surface of the positioning sleeve 64. A spring (not shown in the figure) and a positioning ball 642 are provided in the mounting hole, and the positioning ball 642 is located above the spring. When the rotating disk 63 rotates to a position where the first intermediate mirror 61 or the second intermediate mirror 62 is in the intermediate reflection position, the upper end of at least one positioning ball 642 is inserted into a corresponding positioning hole 631 to form a snap connection.

[0076] In this embodiment, a positioning method of connecting a positioning unit to the rotating disk 63 is adopted, and the positioning sleeve 64 is provided with an installation hole. When the rotating disk 63 rotates relative to the positioning sleeve 64, the positioning ball 642 abuts against the rotating disk 63 under the thrust of the spring, and the positioning ball 642 causes a small resistance to the rotating disk 63. When the first intermediate reflector 61 on the rotating disk 63 is in the intermediate reflection position, a positioning hole 631 on the rotating disk 63 is opposite to the positioning ball 642. Under the thrust of the spring, the upper end of the positioning ball 642 enters the positioning hole 631. The upper end of the positioning ball 642 is not greater than 1 / 2 of the positioning ball 642, preferably 1 / 3 to 1 / 2 of the positioning ball 642. At this time, the positioning ball 642 forms a clamping connection to the rotating disk 63, and the resistance caused by the rotation of the positioning ball 642 to the rotating disk 63 becomes the largest. When the rotating disk 63 rotates in the reverse direction, the rotating disk 63 will overcome the resistance of the positioning ball 642 and press the positioning ball 642 downward. The positioning ball 642 enters the installation hole, but its upper end still abuts against the lower end surface of the rotating disk 63 under the action of the spring. When the second intermediate reflector 62 on the rotating disk 63 is in the intermediate reflection position, another positioning hole 631 on the rotating disk 63 is opposite to the positioning ball 642. At other times, all the positioning balls 642 abut against the lower end surface of the rotating disk 63. Of course, the positioning ball 642 can be directly set without setting the spring.

[0077] It can be understood that 3 installation holes can be provided above the positioning sleeve 64. Springs and positioning balls 642 are arranged in all 3 installation holes. When the rotating disk 63 rotates back and forth, when the rotating disk 63 rotates to the position where the first intermediate reflector 61 or the second intermediate reflector 62 is in the intermediate reflection position, 2 of the positioning balls 642 are inserted into the corresponding 2 positioning holes 631. For example, the positioning balls 642 are ball A, ball B, and ball C respectively. When the rotating disk 63 rotates to the position where the first intermediate reflector 61 is in the intermediate reflection position, ball A and ball B are correspondingly inserted into the 2 positioning holes 631. When the rotating disk 63 rotates to the position where the second intermediate reflector 62 is in the intermediate reflection position, ball B and ball C are correspondingly inserted into the 2 positioning holes 631.

[0078] As the positioning and plugging structure of the positioning sleeve 64 and the rotating disk 63, it can be extended to: the rotating disk 63 is provided with N + 2 positioning holes 631, the upper end surface of the rotating sleeve 65 is provided with N + 3 installation holes, and springs and positioning balls 642 are arranged in each installation hole. When the rotating disk 63 rotates to the position where the second intermediate reflector 62 is in the intermediate reflection position, N + 2 positioning balls 642 are inserted into the corresponding N + 2 positioning holes 631, where N is a natural number.

[0079] As a structural change, the following can also be adopted: the clamping structure between the positioning sleeve 64 and the rotating sleeve 65. For example, the positioning sleeve 64 is sleeved on the outer side of the rotating sleeve 65. There are 2 positioning holes 631 on the outer side of the rotating sleeve 65. At least one mounting hole is provided on the inner side surface of the positioning sleeve 64. A spring and a positioning ball 642 are arranged in the mounting hole. When the rotating disk 63 rotates to the position where the first intermediate mirror 61 or the second intermediate mirror 62 is in the intermediate reflection position, the outer end of at least one positioning ball 642 extends into the positioning hole 631, and the positioning ball 642 forms a clamping connection with the rotating sleeve 65.

[0080] Utilize the positioning between the rotating sleeve 65 and the positioning sleeve 64 to assist in positioning the rotating disk 63 when the rotating disk 63 rotates to the position where the first intermediate mirror 61 or the second intermediate mirror 62 is in the intermediate reflection position; at other times, the positioning ball 642 abuts against the outer side surface of the rotating sleeve 65 under the action of the spring.

[0081] The spring is used to push the positioning ball 642 out of the mounting hole. It can be understood that in order to facilitate the spring to act on the positioning ball 642, a seat body can be arranged between the positioning ball 642 and the spring. A spherical curved surface is arranged on the side of the seat body close to the positioning ball 642 and is matched with the positioning ball 642 to facilitate the rotation of the positioning ball 642 and reduce the friction between the positioning ball 642 and the rotating disk 63 or the rotating sleeve 65.

[0082] To facilitate the connection between the positioning sleeve 64 and the substrate 68, in this embodiment, several connecting columns 641 extend downward from the lower end of the positioning sleeve 64. The substrate 68 is provided with connecting holes matching the positioning columns, and the connecting columns 641 are inserted into the connecting holes. The plugging method can facilitate the connection between the positioning sleeve 64 and the substrate 68.

[0083] See Figure 1 、 Figure 2 , the frame 1 is provided with an XY moving mechanism 7 for driving the laser engraving head 8 to move. The XY moving mechanism 7 includes an X moving mechanism 72 and a Y moving mechanism 71 which are connected to each other. The Y moving mechanism 71 drives the X moving mechanism 72 to move longitudinally, and the X moving mechanism 72 is connected to the laser engraving head 8 and drives the laser engraving head 8 to move transversely; the intermediate mirror unit 6 is arranged on the X moving mechanism 72; the transmission unit includes a flexible sleeve. A connecting wire is arranged in the flexible sleeve. The flexible sleeve is connected to the frame 1. One end of the connecting wire is connected to the displacement mechanism, and the other end of the connecting wire is connected to the switching mechanism.

[0084] Currently, when engraving, there are generally two methods. One is to drive the laser engraving head 8 to move in the XY directions, and the other is to keep the laser engraving head 8 stationary while the workbench moves in the XY directions. In this embodiment, the method of driving the laser engraving head 8 to move is adopted, so an XY moving mechanism 7 is provided. Among them, there are 2 Y moving mechanisms 71, which are respectively arranged on both sides of the X moving mechanism 72. The two Y moving mechanisms 71 synchronously drive the X moving mechanism 72 to move longitudinally. Since the laser engraving head 8 needs to move horizontally and longitudinally during operation, and the intermediate mirror unit 6 is for conveniently projecting the laser onto the laser engraving head 8, the intermediate mirror needs to be arranged on the X moving mechanism 72 and move longitudinally with it. When the intermediate mirror unit 6 moves longitudinally, the connection between the displacement mechanism and the switching mechanism should not be affected. To solve this problem, in this embodiment, the transmission unit 9 adopts a combination of a flexible sleeve and a connecting wire. The flexible sleeve can be connected to the frame 1 and deform with the longitudinal movement of the X moving mechanism 72. When deforming, the length of the connecting wire is not affected. Specifically, a longitudinal drag chain is provided on the frame 1, and the flexible sleeve is fixedly connected to the longitudinal drag chain. The connecting wire can be made of steel wire, with one end connected to the displacement mechanism and the other end connected to the switching mechanism. No matter how the flexible sleeve moves with the X moving mechanism 72, the displacement mechanism can drive the switching mechanism to act through the connecting wire. The flexible sleeve can be a rubber tube, a plastic tube, etc. In this embodiment, one end of the connecting wire can be connected to the first front mirror 31. The movement or rotation of the first front mirror 31 can drive the movement or release of the connecting wire. The other end of the connecting wire can be connected to the rotating shaft 69, and the connecting wire can drive the rotating shaft 69 to rotate. Secondly, when it is necessary to adjust the feeding length of the connecting wire, a transmission mechanism can be connected to the middle of the connecting wire. By adjusting the transmission ratio of the transmission mechanism, the moving distance L1 of the connecting wire driven by the movement or rotation of the first front mirror 31 is adjusted, corresponding to the ratio of the moving distance L2 of the connecting wire that the rotating shaft 69 needs to rotate. For example, when the first front mirror 31 moves or rotates, the connecting wire connected to it moves a distance of 10 cm; while the connecting wire connected to the rotating shaft 69 moves 5 cm, the rotating shaft 69 can be driven to rotate to a predetermined position. The transmission mechanism can adopt a gear transmission mechanism, a lever mechanism, etc. The two ends of the lever of the lever mechanism are respectively connected to the connecting wires on both sides. When the lever rotates, the moving wire distances at both ends are proportional. Just select a transmission mechanism with a suitable transmission ratio, and the transmission mechanism can be in the prior art.

[0085] See Figure 6 The rotating shaft 69 is connected with a rotating wheel 67. The rotating wheel 67 is wound and connected with one end of the connecting wire. The rotating wheel 67 or the rotating shaft 69 is connected with a reset elastic member 66 for driving the rotating shaft 69 to reset.

[0086] In this embodiment, the displacement mechanism is connected to the switching mechanism through the transmission unit 9 and drives the switching mechanism to act. The transmission unit 9 adopts a combination of a flexible sleeve and a connecting wire. The connecting wire cannot apply power in two directions to the switching mechanism. Therefore, a reset elastic member 66 is added in this embodiment. When working, in the initial state, the first intermediate mirror 61 is located at the intermediate reflection position, and the reset elastic member 66 has no elasticity or has slight elasticity but is not sufficient to drive the rotation shaft 69 to rotate. When switching to the second laser emitter 2 to work, the displacement mechanism acts and pulls the connecting wire. The connecting wire moves relative to the flexible sleeve, and the connecting wire pulls the rotating wheel 67 to rotate. The rotating wheel 67 drives the rotation shaft 69 to rotate, and the reset elastic member 66 deforms. The rotation shaft 69 drives the rotating sleeve 65 and the rotating disk 63 to rotate through the elastic transmission unit 610 until the second intermediate mirror 62 rotates to the intermediate reflection position, and the positioning unit is clamped with the rotating sleeve 65 or the rotating disk 63. When switching to the first laser generator to work again, the displacement mechanism acts and releases the connecting wire. The reset elastic member 66 pulls the rotation shaft 69 or the rotating wheel 67 to rotate in the reverse direction, and the connecting wire moves in the reverse direction. When the elastic transmission unit 610 accumulates enough pulling force, it drives the rotating disk 63 to move. The rotating disk 63 or the rotating sleeve 65 is disengaged from the positioning unit until the rotating disk 63 rotates to the position where the second intermediate mirror 62 is located at the intermediate reflection position, and the rotating disk 63 or the rotating sleeve 65 is clamped with the positioning unit again.

[0087] See Figure 6 , the reset elastic member 66 includes a tension spring. One end of the tension spring is connected to the substrate 68 or the positioning sleeve 64, and the other end of the tension spring is connected to the rotating wheel 67 or the rotation shaft 69.

[0088] In this embodiment, the included angle between the positions of the first intermediate mirror 61 and the second intermediate mirror 62 and the center line of rotation is approximately 90 degrees. During the switching rotation of the rotating disk 63, the rotation angles of the rotation shaft 69 and the rotating wheel 67 do not exceed 100 degrees. Therefore, a tension spring can be set to drive the rotation shaft 69 or the rotating wheel 67 to reset. During the working process, the tension spring will not wind around the rotation shaft 69 and the rotating wheel 67. Secondly, it can be understood that the reset elastic member 66 can also adopt others, such as a torsion spring, which is arranged between the frame 1 and the rotation shaft 69.

[0089] The above content is only the 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 manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A dual-light source laser engraving machine, comprising a frame, characterized in that: The frame is equipped with two laser transmitters, a front reflector assembly, a laser engraving head, and an intermediate reflector unit; The two laser transmitters respectively emit a first laser and a second laser; The front reflector assembly comprises a first front reflector and a second front reflector for respectively reflecting the first laser and the second laser in the same direction to the intermediate reflector unit, and a displacement mechanism for changing the position of the first front reflector and / or the second front reflector; The intermediate reflector unit includes: a first intermediate reflector and a second intermediate reflector for reflecting the first laser and the second laser to the laser engraving head respectively, and also includes a switching mechanism for switching the positions of the first intermediate reflector and the second intermediate reflector; The displacement mechanism is connected with the switching mechanism through the transmission unit and moves synchronously; The switching mechanism comprises: substrate; A rotating disk, the upper surface of which is connected to the first intermediate reflector and the second intermediate reflector, and the first intermediate reflector and the second intermediate reflector are arranged at intervals; A rotating sleeve, the lower end of which is open and the upper end of which is fixedly connected to the rotating disk; The rotating shaft, the upper end of which is rotatably connected to the rotating sleeve, and the rotating shaft can rotate freely relative to the rotating sleeve; the rotating shaft is connected to the displacement mechanism through the transmission unit; and the lower end of the rotating shaft is rotatably connected to the base plate; An elastic transmission unit is connected between the rotating sleeve and the rotating shaft; The positioning unit is connected with the rotating disk or the rotating sleeve. A clamping structure is provided between the positioning unit and the rotating disk or the rotating sleeve. When the first intermediate reflector or the second intermediate reflector is located at the intermediate reflecting position, the positioning unit is clamped with the rotating disk or the rotating sleeve.

2. The dual-light source laser engraving machine according to claim 1, characterized in that: The displacement mechanism includes a moving device and a rotating device connected to the first front reflecting mirror.

3. The dual-light source laser engraving machine according to claim 2, characterized in that: The moving device includes a horizontally or vertically arranged guide rail and a linear module. The guide rail is slidably connected with a guide slider, the guide slider is connected to the first front reflector, and the linear module is connected to the first front reflector and drives the first front reflector to move along the guide rail.

4. The dual-light source laser engraving machine according to claim 1, characterized in that: An axial hole matching the rotating shaft is provided in the middle of the upper base plate of the rotating sleeve, and the upper end of the rotating shaft is inserted into the axial hole. N inner protrusions extend inward from the inner side surface of the rotating sleeve, and N outer protrusions extend outward from the side surface of the rotating shaft. The outer protrusions are staggered with the inner protrusions. The elastic transmission unit includes a transmission spring, which is arranged between two adjacent inner protrusions and outer protrusions, and the two ends of the transmission spring are respectively abutted against the corresponding inner protrusions and outer protrusions, and N is a natural number.

5. The dual-light source laser engraving machine according to claim 4, characterized in that: The positioning unit includes a positioning sleeve, which is connected to the base plate and is sleeved on the outside of the rotating sleeve. The upper end surface of the positioning sleeve abuts against the lower end surface of the rotating disk or is provided with a gap. The lower end surface of the rotating disk is provided with two positioning holes. The upper end surface of the positioning sleeve is provided with at least one mounting hole. A spring and a positioning ball are provided in the mounting hole. The positioning ball is located above the spring. When the rotating disk rotates to the point where the first intermediate reflector or the second intermediate reflector is located at the intermediate reflection position, the upper end of at least one positioning ball is inserted into a corresponding positioning hole to form a snap connection.

6. The dual-light source laser engraving machine according to claim 5, characterized in that: A plurality of connecting posts are extended downward from the lower end of the positioning sleeve, and the base plate is provided with connecting holes matched with the positioning posts, and the connecting posts are inserted into the connecting holes.

7. The dual-light source laser engraving machine according to claim 6, characterized in that: The frame is provided with an XY moving mechanism for driving the laser engraving head to move, the XY moving mechanism includes an X moving mechanism and a Y moving mechanism connected to each other, the Y moving mechanism drives the X moving mechanism to move longitudinally, the X moving mechanism is connected to the laser engraving head and drives the laser engraving head to move laterally; the intermediate reflector unit is arranged on the X moving mechanism; the transmission unit includes a flexible sleeve, a connecting line is arranged in the flexible sleeve, the flexible sleeve is connected to the frame, one end of the connecting line is connected to the displacement mechanism, and the other end of the connecting line is connected to the switching mechanism.

8. The dual-light source laser engraving machine according to claim 7, characterized in that: The rotating shaft is connected with a rotating wheel, the rotating wheel is wound and connected with one end of the connecting line, and the rotating wheel or the rotating shaft is connected with a resetting elastic member for driving the rotating shaft to reset.

9. The dual-light source laser engraving machine according to claim 8, characterized in that: The resetting elastic member comprises a tension spring, one end of which is connected to the base plate or the positioning sleeve, and the other end of which is connected to the rotating wheel or the rotating shaft.

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