Automatic focusing lens module of ultraviolet laser marking machine

Abstract

The utility model relates to the technical field of marking machines, in particular to an automatic focusing lens module of an ultraviolet laser marking machine, which comprises a laser marking head, a focusing field lens arranged at the bottom of the laser marking head, and a circular protective cover arranged at the bottom of the laser marking head and used for protecting the focusing field lens. A positioning assembly used for fixing the position of the circular protective cover is arranged at the bottom of the laser marking head and comprises a fixing vertical plate, movable rods capable of moving front and back are arranged on the positions, close to the left end and the right end, of the front side of the fixing vertical plate in a penetrating mode, and the front ends of the two movable rods are jointly connected with a connecting transverse plate. Fixing longitudinal plates are arranged at the left end and the right end of the top of the rear side of the fixing vertical plate correspondingly, and U-shaped butt joint blocks are arranged at the positions, close to the rear ends, of the bottoms of the two fixing longitudinal plates correspondingly. According to the automatic focusing lens module of the ultraviolet laser marking machine, through the linkage design of the positioning assembly and the circular protective cover, rapid locking and releasing of the circular protective cover are achieved, and the operation complexity is remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of marking machine technology, specifically to an automatic focusing lens module for an ultraviolet laser marking machine. Background Technology

[0002] Ultraviolet laser marking machines are high-precision devices that use ultraviolet laser light sources for non-contact marking. They are widely used in the surface treatment of electronic, packaging, and metallic and non-metallic materials. Their main advantage lies in their ability to achieve high-quality, detailed marking on various material surfaces without causing thermal damage. However, an accurate focusing system is crucial to ensuring marking results.

[0003] In ultraviolet laser marking machines, the focusing module is a key component that ensures accurate focusing of the laser beam. Depending on different application requirements, the focusing system is divided into two types: manual focusing and automatic focusing.

[0004] Manual focus typically includes two adjustment methods:

[0005] 1. Direct Lens Adjustment: This method allows operators to manually rotate the lens to adjust the focus by setting a rotatable or movable adjustment mechanism. While simple and intuitive, it requires operators to possess certain professional knowledge and experience to ensure accurate focus.

[0006] 2. Focusing via table lifting: Focusing is achieved by controlling the up-and-down movement of the worktable using rotating pulleys or an electric lifting mechanism. This method allows for focus adjustment without directly interfering with the laser head and is suitable for large-volume production. However, in actual operation, there may still be issues with untimely adjustments.

[0007] With the advancement of laser marking technology, autofocus systems have gradually become mainstream. Autofocus modules typically include the following key technologies:

[0008] 1. Automatic Focusing Device: This device uses sensors to detect the focal length information on the surface of the laser marking machine in real time. The control system automatically adjusts the focusing distance of the laser beam based on the received information. This real-time feedback mechanism effectively improves focusing accuracy and reduces the need for human intervention.

[0009] 2. Dual Red Light Positioning Device: Two tilted red lights are installed next to the galvanometer. By utilizing the principle of right triangles, the focal plane is found by observing the overlap of the two red light points. This precise positioning method can effectively improve the accuracy of marking, especially in complex marking tasks.

[0010] Due to the significant advantages of autofocus technology, current ultraviolet laser marking machines generally adopt autofocus lenses to improve marking efficiency and quality.

[0011] For example, patent CN206122916U discloses a lifting mechanism for a focusing lens in a laser marking machine. The mechanism includes a laser marking head, a focusing lens, a lens connector, a motor, and a motor connecting block. The focusing lens is fixed to the lens connector and movably mounted on the bottom of the laser marking head, allowing it to move up and down. The motor is fixed to the laser marking head via the motor connecting block and is adjacent to the lens connector. A gear is mounted on the motor's shaft, and the lens connector has a rack at a corresponding position on the gear, with the rack's path direction matching the focusing lens's movement direction. The gear meshes with the rack. This invention uses a motor that only moves the focusing lens to adjust the focusing position. Since the focusing lens is lightweight and has a low load, the motor power can be significantly reduced, thus lowering the overall cost of the laser marking machine. Furthermore, it features high sensitivity, simple structure, and strong applicability.

[0012] However, since the lens of an ultraviolet laser marking machine is directly exposed to the external environment, it is easily damaged by accidental impacts. Therefore, lens protection mechanisms have been developed. For example, patent CN219293022U discloses a laser marking machine with a lens protection mechanism. The machine includes a laser marking machine with a moving mechanism fixedly mounted on its top, and a laser printhead fixedly mounted on the front of the moving mechanism. This invention, by setting up a mounting block, a protective shell, and a movable block, allows the operator to pull the block, causing the connecting block to press against the movable block. This, in turn, moves the movable block on the outer surface of the fixed rod. Simultaneously, the movable block causes a locking block to move out of the mounting block, releasing it from the protective shell. The protective shell is then pulled outwards, releasing it from obstruction of the laser printhead. The elastic force of the flexible spring then causes the locking block to reset, fixing the protective shell in place. This allows the operator to easily protect the laser printhead using the protective shell, preventing damage when the machine is not in use.

[0013] However, existing protection mechanisms are cumbersome to operate in practice, which not only affects work efficiency but also increases the complexity of operation and is not conducive to the use of staff. In view of the above-mentioned shortcomings of the background technology, we propose an automatic focusing lens module for ultraviolet laser marking machines, which aims to simplify the protection mechanism and improve the ease of operation. Utility Model Content

[0014] The purpose of this invention is to provide an automatic focusing lens module for an ultraviolet laser marking machine to solve the problems mentioned in the background art.

[0015] To achieve the above objectives, this utility model provides the following technical solution:

[0016] An automatic focusing lens module for an ultraviolet laser marking machine includes a laser marking head, which emits an ultraviolet laser beam and completes the marking operation. A focusing field lens is located at the bottom of the laser marking head, used to focus the laser beam to form a high-energy-density spot. A circular protective cover is also located at the bottom of the laser marking head to protect the focusing field lens from external impacts or dust contamination. A positioning component is also located at the bottom of the laser marking head to fix the position of the circular protective cover, allowing for quick locking or releasing of the protective cover's installation position.

[0017] The positioning component includes a fixed vertical plate, which serves as the supporting body of the positioning component. Movable rods that can move back and forth are provided through the front side of the fixed vertical plate and near the left and right ends. The movable rods can control the locking state of the circular protective cover by moving back and forth. The front ends of the two movable rods are connected to a connecting horizontal plate, which is used to synchronize the movement of the two movable rods.

[0018] Fixed vertical plates are provided at both ends of the top rear side of the fixed vertical plate. The fixed vertical plates are used to support the installation position of the U-shaped docking block. U-shaped docking blocks are provided at the bottom and near the rear end of the two fixed vertical plates. The U-shaped docking blocks are used to accommodate the positioning side block and cooperate with the movable rod to complete the locking. The rear end of the movable rod passes through the front side of the U-shaped docking block into the U-shaped docking block.

[0019] The outer wall of the circular protective cover is provided with two positioning side blocks arranged symmetrically on the left and right. The positioning side blocks are used to cooperate with the U-shaped docking blocks to fix the position of the circular protective cover. The two positioning side blocks are respectively located in the two U-shaped docking blocks. The front side of the positioning side blocks is provided with positioning slots for the insertion of movable rods. The positioning slots achieve mechanical locking of the circular protective cover by inserting the movable rods.

[0020] Preferred, such as Figure 2 As shown, the bottom of the laser marking head is provided with an annular limiting plate, and the focusing field lens is located inside the annular limiting plate. The annular limiting plate is used to guide the fitting of the circular protective cover.

[0021] The inner wall of the circular protective cover fits into the outer wall of the annular limiting plate. A counterweight is provided in the middle of the bottom of the circular protective cover. The counterweight causes the unlocked circular protective cover to quickly separate from the positioning component and the annular limiting plate by gravity, thereby improving the disassembly efficiency of the circular protective cover.

[0022] Preferred, such as Figure 5 As shown, mounting seats are provided at both the left and right ends of the top front side of the fixed vertical plate. The bottom of the mounting seat is provided with mounting holes b for bolts to pass through. The mounting seat is used to fix the positioning component to the bottom of the laser marking head by bolts.

[0023] The bottom of the fixed longitudinal plate and near the rear end are provided with a mounting hole a for bolts to pass through. The mounting base and the fixed longitudinal plate are both connected to the bottom of the laser marking head by bolts. The fixed positioning component is located at the bottom of the laser marking head.

[0024] The outer wall of the movable rod is provided with an annular fixed block. When the positioning side block is fixed in the U-shaped docking block, the rear side of the annular fixed block abuts against the front side of the U-shaped docking block. The annular fixed block is used to limit the movement range of the movable rod and cooperates with the spring to provide a reset elastic force.

[0025] A spring is fitted on the outer wall of the movable rod. The front end of the spring abuts against the rear side of the fixed vertical plate, and the rear end of the spring abuts against the front side of the annular block. The spring causes the movable rod to automatically return to the locked position when there is no external force through elastic reset.

[0026] A pull rod is provided in the middle of the front side of the connecting cross plate. The front end of the pull rod protrudes from the front side of the laser marking head. The pull rod provides manual operation to pull the movable rod to release the circular protective cover lock.

[0027] Compared with the prior art, the beneficial effects of this utility model are:

[0028] 1. The automatic focusing lens module of this ultraviolet laser marking machine achieves rapid locking and releasing of the circular protective cover through the linkage design of the positioning component and the circular protective cover, which significantly reduces the complexity of operation.

[0029] 2. The automatic focusing lens module of this ultraviolet laser marking machine features a circular protective cover combined with a ring-shaped limiting plate for guiding and fitting. This ensures that the circular protective cover accurately covers the focusing lens, effectively preventing external collisions or dust contamination. At the same time, the counterweight assists in quickly separating the circular protective cover through gravity, improving disassembly efficiency.

[0030] 3. The automatic focusing lens module of this ultraviolet laser marking machine automatically locks the position of the circular protective cover when there is no external force through the elastic reset action of the spring and the synchronous movement mechanism of the movable rod, so as to avoid the failure of protection due to accidental contact.

[0031] 4. The ultraviolet laser marking machine features an automatic focusing lens module and stable protection of the focusing field lens, reducing marking errors caused by lens contamination or offset. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0033] Figure 2 This is a schematic diagram of the overall structure of this utility model in use.

[0034] Figure 3 This is a partial structural schematic diagram of the present invention;

[0035] Figure 4 This is a schematic diagram of the circular protective cover structure in this utility model;

[0036] Figure 5 This is a schematic diagram of the positioning component structure in this utility model;

[0037] Figure 6 This is a partial structural diagram of the positioning component in this utility model;

[0038] In the diagram: 1. Laser marking head; 2. Focusing lens; 3. Circular protective cover; 30. Positioning side block; 300. Positioning slot; 31. Counterweight; 4. Positioning assembly; 40. Fixed vertical plate; 41. Movable rod; 410. Annular fixed block; 42. Connecting horizontal plate; 43. Pull rod; 44. Fixed vertical plate; 440. Mounting hole a; 45. U-shaped docking block; 46. Spring; 47. Mounting base; 470. Mounting hole b; 5. Annular limiting plate. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0041] Please see Figures 1-6 This utility model provides a technical solution:

[0042] The automatic focusing lens module of the ultraviolet laser marking machine includes a laser marking head 1, which emits an ultraviolet laser beam and completes the marking operation. The bottom of the laser marking head 1 is equipped with a focusing field lens 2, which focuses the laser beam to form a high energy density spot. The bottom of the laser marking head 1 is equipped with a circular protective cover 3 to protect the focusing field lens 2. The circular protective cover 3 is used to prevent external collisions or dust from contaminating the focusing field lens 2. The bottom of the laser marking head 1 is equipped with a positioning component 4 to fix the position of the circular protective cover 3. The positioning component 4 is used to quickly lock or release the installation position of the circular protective cover 3. When using the ultraviolet laser marking machine, the circular protective cover 3 can be quickly removed to expose the automatic focusing lens module.

[0043] The positioning component 4 includes a fixed vertical plate 40, which serves as the supporting body of the positioning component 4. Movable rods 41 that can move back and forth are provided through the front side of the fixed vertical plate 40 and near the left and right ends. The movable rods 41 can control the locking state of the circular protective cover 3 by moving back and forth. The front ends of the two movable rods 41 are connected to a connecting horizontal plate 42, which is used to synchronize the movement of the two movable rods 41.

[0044] Fixed vertical plates 44 are provided at both ends of the top rear side of the fixed vertical plate 40. The fixed vertical plates 44 are used to support the installation position of the U-shaped docking block 45. U-shaped docking blocks 45 are provided at the bottom of the two fixed vertical plates 44 and near the rear end. The U-shaped docking block 45 is used to accommodate the positioning side block 30 and cooperate with the movable rod 41 to complete the locking. The rear end of the movable rod 41 passes through the front side of the U-shaped docking block 45 into the U-shaped docking block 45.

[0045] The outer wall of the circular protective cover 3 is provided with two positioning side blocks 30 arranged symmetrically on the left and right. The positioning side blocks 30 are used to cooperate with the U-shaped docking blocks 45 to fix the position of the circular protective cover 3. The two positioning side blocks 30 are respectively located in the two U-shaped docking blocks 45. The front side of the positioning side block 30 is provided with a positioning slot 300 for the movable rod 41 to be inserted. The positioning slot 300 achieves mechanical locking of the circular protective cover 3 by inserting the movable rod 41.

[0046] In this embodiment, as Figure 2 As shown, the bottom of the laser marking head 1 is provided with an annular limiting plate 5, and the focusing field lens 2 is located inside the annular limiting plate 5. The annular limiting plate 5 is used to guide the fitting of the circular protective cover 3.

[0047] The inner wall of the circular protective cover 3 is in contact with the outer wall of the annular limiting plate 5. A counterweight 31 is provided in the middle of the bottom of the circular protective cover 3. The counterweight 31 uses gravity to quickly separate the unlocked circular protective cover 3 from the positioning component 4 and the annular limiting plate 5, thereby improving the disassembly efficiency of the circular protective cover 3.

[0048] Specifically, such as Figure 5As shown, mounting seats 47 are provided at both ends of the top front side of the fixed vertical plate 40. The bottom of the mounting seat 47 is provided with mounting holes b470 for bolts to pass through. The mounting seat 47 is used to fix the positioning assembly 4 to the bottom of the laser marking head 1 by bolts.

[0049] The bottom of the fixed longitudinal plate 44 and near the rear end are provided with mounting holes a440 for bolts to pass through. The mounting base 47 and the fixed longitudinal plate 44 are both connected to the bottom of the laser marking head 1 by bolts. The fixed positioning component 4 is fixed to the bottom of the laser marking head 1.

[0050] The outer wall of the movable rod 41 is provided with an annular fixed block 410. When the positioning side block 30 is fixed in the U-shaped docking block 45, the rear side of the annular fixed block 410 abuts against the front side of the U-shaped docking block 45. The annular fixed block 410 is used to limit the movement range of the movable rod 41 and cooperates with the spring 46 to provide a reset elastic force.

[0051] A spring 46 is sleeved on the outer wall of the movable rod 41. The front end of the spring 46 abuts against the rear side of the fixed vertical plate 40, and the rear end of the spring 46 abuts against the front side of the annular fixed block 410. The spring 46 causes the movable rod 41 to automatically return to the locked position when there is no external force through the elastic reset action.

[0052] A pull rod 43 is provided in the middle of the front side of the connecting horizontal plate 42. The front end of the pull rod 43 protrudes from the front side of the laser marking head 1. The pull rod 43 provides manual operation to pull the movable rod 41 to release the locking of the circular protective cover 3.

[0053] When using the automatic focusing lens module of the ultraviolet laser marking machine in this embodiment, if it is necessary to install the circular protective cover 3, first pull the lever 43 to move the connecting cross plate 42 forward, so that the movable rod 41 moves forward against the elastic force of the spring 46 until the rear end of the movable rod 41 moves out of the U-shaped docking block 45. Then, align the positioning side block 30 of the circular protective cover 3 with the U-shaped docking block 45 and push it in. Then release the lever 43, the spring 46 pushes the annular fixed block 410 to reset, and the movable rod 41 inserts into the positioning slot 300 of the positioning side block 30, completing the mechanical installation of the circular protective cover 3. Locked, at this time the inner wall of the circular protective cover 3 is in contact with the outer wall of the annular limiting plate 5; when it is necessary to disassemble the circular protective cover 3, pull the lever 43 again to make the movable rod 41 disengage from the positioning slot 300, and the gravity of the counterweight 31 makes the circular protective cover 3 quickly disengage from the positioning component 4 and the annular limiting plate 5; the ultraviolet laser beam emitted by the laser marking head 1 is focused by the focusing field lens 2 to achieve high-precision marking. The whole process is achieved by the linkage mechanism of the positioning component 4 and the elastic reset of the spring 46 to realize the rapid disassembly and assembly of the circular protective cover 3, while avoiding external collisions or dust contamination of the focusing field lens 2.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic focusing lens module for an ultraviolet laser marking machine, comprising a laser marking head (1), wherein a focusing field lens (2) is provided at the bottom of the laser marking head (1), characterized in that: The bottom of the laser marking head (1) is provided with a circular protective cover (3) for protecting the focusing field lens (2). The bottom of the laser marking head (1) is provided with a positioning component (4) for fixing the position of the circular protective cover (3). The positioning component (4) includes a fixed vertical plate (40). Movable rods (41) that can move back and forth are provided through the front side of the fixed vertical plate (40) and near the left and right ends. The front ends of the two movable rods (41) are connected to a connecting horizontal plate (42). The left and right ends of the top rear side of the fixed vertical plate (40) are provided with... A fixed longitudinal plate (44) is provided. At the bottom of the two fixed longitudinal plates (44) and near the rear end, a U-shaped docking block (45) is provided. The rear end of the movable rod (41) passes through the front side of the U-shaped docking block (45) and enters the U-shaped docking block (45). The outer wall of the circular protective cover (3) is provided with two positioning side blocks (30) arranged symmetrically on the left and right. The two positioning side blocks (30) are respectively located in the two U-shaped docking blocks (45). The front side of the positioning side block (30) is provided with a positioning slot (300) for the movable rod (41) to be inserted.

2. The automatic focusing lens module for the ultraviolet laser marking machine according to claim 1, characterized in that: The bottom of the laser marking head (1) is provided with an annular limiting plate (5), and the focusing field lens (2) is located inside the annular limiting plate (5).

3. The automatic focusing lens module for the ultraviolet laser marking machine according to claim 2, characterized in that: The inner wall of the circular protective cover (3) is in contact with the outer wall of the annular limiting plate (5), and a counterweight (31) is provided in the middle of the bottom of the circular protective cover (3).

4. The automatic focusing lens module for the ultraviolet laser marking machine according to claim 1, characterized in that: The fixed vertical plate (40) has mounting seats (47) at both ends of the front top. The bottom of the mounting seat (47) has mounting holes b (470) for bolts to pass through.

5. The automatic focusing lens module for the ultraviolet laser marking machine according to claim 4, characterized in that: The bottom of the fixed longitudinal plate (44) and near the rear end are provided with a mounting hole a (440) for bolts to pass through. The mounting base (47) and the fixed longitudinal plate (44) are both connected to the bottom of the laser marking head (1) by bolts.

6. The automatic focusing lens module for the ultraviolet laser marking machine according to claim 1, characterized in that: The outer wall of the movable rod (41) is provided with an annular fixed block (410). When the positioning side block (30) is fixed in the U-shaped docking block (45), the rear side of the annular fixed block (410) abuts against the front side of the U-shaped docking block (45).

7. The automatic focusing lens module for the ultraviolet laser marking machine according to claim 6, characterized in that: A spring (46) is fitted on the outer wall of the movable rod (41). The front end of the spring (46) abuts against the rear side of the fixed vertical plate (40), and the rear end of the spring (46) abuts against the front side of the annular fixed block (410).

8. The automatic focusing lens module for the ultraviolet laser marking machine according to claim 1, characterized in that: A pull rod (43) is provided in the middle of the front side of the connecting cross plate (42), and the front end of the pull rod (43) protrudes from the front side of the laser marking head (1).

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