Positioning tool for heart rate monitoring lens laser engraving
By combining mechanical clamping with negative pressure adsorption, the positioning fixture solves the problem of unstable positioning in the laser engraving of heart rate monitoring lenses using traditional clamping methods. It achieves high-precision positioning and adaptable clamping for diverse lenses, thus improving engraving quality and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI JIECHENG PHOTOELECTRIC CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional clamping methods make it difficult to achieve high-precision positioning of heart rate monitoring lenses during laser engraving, which can easily lead to engraving deviation, scratches, or stress deformation. Furthermore, existing clamping mechanisms cannot adapt to different lens specifications, resulting in low production efficiency.
It employs a combination of mechanical clamping and negative pressure adsorption for positioning, along with a thin-film pressure sensor feedback and an adaptive adjustment mechanism, to achieve flexible clamping and adsorption. The V-groove of the clamping plate adapts to different curvatures, and the flexible connection of the suction cup adapts to surface changes, allowing for real-time monitoring and adjustment of clamping and adsorption forces.
It improves engraving quality and production efficiency, ensures high-precision positioning and non-destructive processing of lenses during laser engraving, and adapts to diverse lens types.
Smart Images
Figure CN224526285U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heart rate monitoring lens processing technology, and specifically discloses a positioning fixture for laser engraving of heart rate monitoring lenses. Background Technology
[0002] With the rapid development of smart wearable devices, the demand for lenses integrating heart rate monitoring (such as smart glasses lenses) is increasing. These lenses typically require laser engraving to create micron-level sensor circuits or optical structures in specific areas, and the precision of this process directly affects the accuracy and reliability of heart rate monitoring. However, lenses (especially curved and ultra-thin lenses) are prone to engraving misalignment during laser engraving due to unstable positioning, and traditional clamping methods easily cause surface scratches or stress deformation, becoming key issues restricting production yield and efficiency.
[0003] Traditional mechanical clamping devices often use rigid clamps (such as metal claws) to directly contact the lens edge. The clamping force is difficult to control precisely, which can easily lead to edge chipping or surface indentation. In particular, they are not well-suited for lenses with varying curvatures. Some devices use vacuum suction cups to adsorb lenses, which can avoid clamping damage, but uneven negative pressure distribution can easily cause local warping of the lens. In addition, high-frequency vibrations during the engraving process can easily cause micro-slippage between the lens and the suction cup, affecting the engraving accuracy. As a result, existing clamping or adsorption mechanisms are mostly fixed designs, which cannot dynamically adjust the contact pressure and adsorption point according to the lens thickness and curvature. This leads to frequent tooling changes for different lens specifications, resulting in low efficiency. Therefore, improvements are needed. Utility Model Content
[0004] This invention proposes a positioning fixture for laser engraving of heart rate monitoring lenses. Through the coordinated positioning of mechanical clamping and negative pressure adsorption, combined with the feedback of thin film pressure sensor and adaptive adjustment mechanism, it achieves high-precision positioning, curved surface adaptive fitting, non-destructive clamping and vibration offset suppression of heart rate monitoring lenses in laser engraving, significantly improving engraving quality and production efficiency.
[0005] This utility model is implemented as follows: a positioning fixture for laser engraving of heart rate monitoring lenses includes a processing table, a movable adjustment frame disposed on the top of the processing table, and a laser engraving device disposed on the outer wall of the adjustment frame. A lens placement area is disposed in the middle of the top of the processing table. A clamping mechanism and an adsorption positioning mechanism are respectively disposed on the top and bottom of the processing table. The clamping mechanism includes first electric push rods symmetrically distributed on both sides of the lens placement area and fixed to the top of the processing table. The output end of the first electric push rod is fixedly connected to a clamping plate. V-shaped grooves are opened on the opposite sides of the two clamping plates. A thin film pressure sensor is fixedly connected to the inner side wall of the V-shaped groove of the clamping plate. A rubber pad is fixedly connected to the side of the thin film pressure sensor away from the V-shaped groove of the clamping plate.
[0006] The top of the processing table has an alignment groove located in the lens placement area and smaller than the lens size. The bottom of the processing table has a groove communicating with the alignment groove. The adsorption positioning mechanism includes a movable plate located inside the groove. The top of the movable plate is provided with a first suction pipe that can be moved into the alignment groove and a second suction pipe symmetrically distributed on both sides of the first suction pipe. One end of the first suction pipe passes through the movable plate and is fixedly connected to the movable plate. The top of the movable plate has ports that are slidably connected to the two first suction pipes respectively. One end of the first suction pipe and the second suction pipe is connected to a suction cup through a corrugated pipe.
[0007] As a preferred positioning fixture for laser engraving of heart rate monitoring lenses according to this utility model, a horizontal plate located below the moving plate is fixedly installed between the left and right side walls inside the groove. The width of the horizontal plate is 1 / 3 of the width of the groove. Two symmetrically distributed second electric actuators are fixedly connected to the top of the horizontal plate, and the output ends of the two second electric actuators are fixedly connected to the bottom of the moving plate.
[0008] As a preferred positioning fixture for laser engraving of heart rate monitoring lenses according to this utility model, the adsorption positioning mechanism further includes a fixed frame in the shape of an inverted U fixedly installed at the bottom of the processing table. An air pump is fixedly installed at the bottom of the fixed frame. The output end of the air pump is connected to an air pipe. Three connecting pipes with solenoid valves are installed on the outer wall of the air pipe. The other ends of the three connecting pipes are connected to the first air suction pipe and two second air suction pipes respectively through flexible hoses.
[0009] As a preferred positioning fixture for laser engraving of heart rate monitoring lenses according to this utility model, a support plate is fixedly connected to the outer wall of the second air inlet tube, and a damping spring sleeved on the outer wall of the second air inlet tube is fixedly connected between the bottom of the support plate and the top of the moving plate.
[0010] As a preferred positioning fixture for laser engraving of heart rate monitoring lenses according to this utility model, both sides of the moving plate are fixedly connected to U-shaped sliding plates, and the sliding plates are slidably connected to slide rails fixed to the inner wall of the groove.
[0011] As a preferred positioning fixture for laser engraving of heart rate monitoring lenses according to this utility model, the bottom of the clamping plate is fixedly connected to a slider, the outer wall of the slider is slidably connected to a groove opened on the top of the processing table, and one end of the groove extends to the lens placement area.
[0012] The beneficial effects of this utility model are:
[0013] 1. The V-groove of the clamping plate adapts to the edges of lenses with different curvatures, the rubber pad provides flexible contact, and the thin-film pressure sensor monitors the clamping force in real time and feeds it back to the control system to achieve constant force clamping and avoid displacement of the lens due to overpressure deformation or insufficient clamping.
[0014] 2. The damping spring on the outside of the second suction tube allows the suction cup to float up and down. Combined with the flexible connection of the corrugated tube, the suction cup adapts to the curvature change of the lens surface, evenly distributes the adsorption force, and avoids local stress concentration that could cause the lens to warp or break. In addition, the three suction cups (central and two sides) are opened and closed independently by solenoid valves, allowing for the selection of adsorption modes for flat or curved lenses (such as only opening the two side suction cups to enhance edge fixation), adapting to a variety of lens types and improving production efficiency. Attached Figure Description
[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0016] Figure 1 This is a top view of the positioning fixture for laser engraving of a heart rate monitoring lens according to the present invention.
[0017] Figure 2 This is a frontal sectional view of the present invention.
[0018] Figure 3 This is a structural diagram of the movable plate of this utility model.
[0019] Figure 4 This utility model Figure 2 Enlarged structural diagram at point A in the middle.
[0020] The markings in the diagram are as follows: 1. Processing table; 101. Adjustment frame; 102. Laser engraving equipment; 103. Fixing frame; 2. Lens placement area; 3. First electric actuator; 301. Clamping plate; 302. Thin-film pressure sensor; 303. Rubber pad; 304. Slide groove; 305. Slider; 4. Alignment groove; 5. Groove; 6. Moving plate; 601. First suction pipe; 602. Suction cup; 7. Port; 701. Second suction pipe; 702. Damping spring; 703. Support plate; 8. Horizontal plate; 801. Second electric actuator; 802. Slide plate; 803. Slide rail; 9. Air pump; 901. Vent pipe; 902. Connecting pipe. Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments to aid in understanding its content. Unless otherwise specified, the methods used in this invention are conventional methods; the raw materials and apparatus used, unless otherwise specified, are conventional commercially available products.
[0022] Please see Figure 1-4A positioning fixture for laser engraving of heart rate monitoring lenses includes a processing table 1, a movable adjustment frame 101 disposed on the top of the processing table 1, and a laser engraving device 102 disposed on the outer wall of the adjustment frame 101. A lens placement area 2 is disposed in the middle of the top of the processing table 1. A clamping mechanism and an adsorption positioning mechanism are respectively disposed on the top and bottom of the processing table 1. The clamping mechanism includes a first electric push rod 3 symmetrically distributed on both sides of the lens placement area 2 and fixed to the top of the processing table 1. The output end of the first electric push rod 3 is fixedly connected to a clamping plate 301. V-shaped grooves are opened on the opposite sides of the two clamping plates 301. A thin film pressure sensor 302 is fixedly connected to the inner side wall of the V-shaped groove of the clamping plate 301. A rubber pad 303 is fixedly connected to the side of the thin film pressure sensor 302 away from the V-shaped groove of the clamping plate 301.
[0023] The top of the processing table 1 is provided with an alignment groove 4 located in the lens placement area 2 and smaller than the lens size. The bottom of the processing table 1 is provided with a groove 5 communicating with the alignment groove 4. The adsorption positioning mechanism includes a movable plate 6 located inside the groove 5. The top of the movable plate 6 is provided with a first suction pipe 601 that can be moved into the alignment groove 4 and a second suction pipe 701 symmetrically distributed on both sides of the first suction pipe 601. One end of the first suction pipe 601 passes through the movable plate 6 and is fixedly connected to the movable plate 6. The top of the movable plate 6 is provided with a port 7 that is slidably connected to the two first suction pipes 601 respectively. One end of the first suction pipe 601 and the second suction pipe 701 is connected to a suction cup 602 through a corrugated pipe.
[0024] In this embodiment: the lens is placed in the lens placement area 2 on the top of the processing table, so that the lens covers the alignment groove 4 (the size of the alignment groove 4 is smaller than the lens). The V-shaped groove design of the two clamping plates 301 of the clamping mechanism is adapted to the lens edges with different curvatures or thicknesses. The rubber pad 303 provides flexible contact to avoid scratches. The thin film pressure sensor 302 monitors the clamping force in real time. When the preset threshold is reached, the first electric push rod 3 stops advancing to prevent overpressure damage to the lens.
[0025] The suction cup 602 of the adsorption mechanism contacts the bottom of the lens through the alignment groove 4. The air pump 9 is started to draw air through the air pipe 901 and the connecting pipe 902 to the first air pipe 601 and the second air pipe 701, so that the suction cup 602 generates negative pressure to adsorb the lens. The damping spring 702 on the outside of the second air pipe 701 provides buffering, so that the suction cup 602 fits tightly against the curved surface of the lens to compensate for the unevenness of the surface. The clamping mechanism fixes the lens horizontally from both sides, and the adsorption mechanism adsorbs vertically from the bottom, forming a three-dimensional constraint to prevent vibration or displacement during engraving. The alignment groove 4 serves as a reference to ensure that the suction cup 602 is aligned with the clamping position, improves the positioning accuracy, and ensures the accuracy of the engraved pattern.
[0026] As a technical optimization of this utility model, a horizontal plate 8 located below the movable plate 6 is fixedly installed between the left and right side walls inside the groove 5. The width of the horizontal plate 8 is 1 / 3 of the width of the groove 5. Two symmetrically distributed second electric actuators 801 are fixedly connected to the top of the horizontal plate 8. The output ends of the two second electric actuators 801 are fixedly connected to the bottom of the movable plate 6.
[0027] In this embodiment: after the second electric actuator 801 is energized, it pushes the moving plate 6 to rise and fall in the vertical direction. When the moving plate 6 rises, it drives the first suction pipe 601 and the second suction pipe 701 to move into the alignment groove 4 to contact the bottom of the lens. When it falls, the suction cup 602 retracts into the groove 5 to avoid interfering with the placement of the lens. The narrow width design of the horizontal plate 8 (1 / 3 of the width of the groove 5) reduces the obstruction of the air pump 9 and the pipeline.
[0028] As a technical optimization of this utility model, the adsorption positioning mechanism also includes a fixed frame 103 in the shape of an inverted U that is fixedly installed at the bottom of the processing table 1. An air pump 9 is fixedly installed at the bottom of the fixed frame 103. The output end of the air pump 9 is connected to an air pipe 901. Three connecting pipes 902 with solenoid valves are installed on the outer wall of the air pipe 901. The other ends of the three connecting pipes 902 are connected to the first suction pipe 601 and two second suction pipes 701 respectively through flexible hoses.
[0029] In this embodiment: After the air pump 9 is started, air is drawn through the air pipe 901, creating a negative pressure in the three connecting pipes 902. The opening and closing of each connecting pipe 902 is controlled individually by the solenoid valve, selectively activating the central suction cup 602 (first suction pipe 601) or the two side suction cups 602 (second suction pipe 701). For example, when dealing with curved lenses, only the two side suction cups 602 are activated to enhance edge adsorption. The negative pressure is transmitted to the suction cups 602 through the corrugated pipe. The suction cups 602 flexibly conform to the lens surface to adapt to curvature changes. The length of the corrugated pipe in its natural state is 1.5 to 2 times the thickness of the lens, reducing excessive bending of the corrugated pipe and maintaining the vertical force state of the suction cup. At the same time, it ensures that the corrugated pipe is in a slightly stretched state (not completely relaxed) during adsorption, so as to use its rigidity to offset part of the lateral force.
[0030] As a technical optimization of this utility model, a support plate 703 is fixedly connected to the outer wall of the second air intake pipe 701, and a damping spring 702 sleeved on the outer wall of the second air intake pipe 701 is fixedly connected between the bottom of the support plate 703 and the top of the moving plate 6.
[0031] In this embodiment: when the suction cup 602 contacts the lens, the damping spring 702 is compressed to absorb mechanical impact and prevent the lens from being damaged by rigid collision. If the lens surface is uneven (such as edge warping), the second suction tube 701 can float slightly up and down under the action of the damping spring 702 to ensure that the suction cup 602 is in close contact with the lens, and the spring force and negative pressure adsorption force are balanced to avoid local overpressure causing lens deformation.
[0032] As a technical optimization of this utility model, both sides of the movable plate 6 are fixedly connected with U-shaped sliding plates 802, and the sliding plates 802 are slidably connected with slide rails 803 fixed to the inner wall of the groove 5.
[0033] In this embodiment: when the movable plate 6 is raised or lowered, the slide plate 802 slides along the slide rail 803 to limit the lateral displacement of the movable plate 6 and ensure that the suction cup 602 is always aligned with the center of the lens. The slide rails 803 on both sides are symmetrically arranged to counteract the torque that may be generated when the second electric push rod 801 is driven, and to keep the movable plate 6 raised or lowered horizontally.
[0034] As a technical optimization of this utility model, a slider 305 is fixedly connected to the bottom of the clamping plate 301, and a groove 304 opened on the top of the processing table 1 is slidably connected to the outer wall of the slider 305, and one end of the groove 304 extends to the lens placement area 2.
[0035] In this embodiment: when the clamping plate 301 moves under the drive of the first electric push rod 3, the slider 305 slides along the slide groove 304, forcing the clamping plate 301 to translate along a preset trajectory (pointing to the center of the lens) to avoid deflection. The end of the slide groove 304 extends to the edge of the lens placement area 2, limiting the maximum stroke of the clamping plate 301 and preventing excessive clamping from causing the lens to displace beyond the alignment groove 4.
[0036] The working principle and usage process of this utility model: The device is electrically connected to an external power supply and a PLC controller. When in use, the lens is placed in the lens placement area 2 on the top of the processing table, so that the lens covers the alignment groove 4 (the size of the alignment groove 4 is smaller than the lens). The two first electric push rods 3 are activated to extend synchronously, pushing the clamping plate 301 to move towards the lens. The V-shaped groove design of the clamping plate 301 is adapted to the edge of the lens with different curvature or thickness. The rubber pad 303 provides flexible contact to avoid scratches. The thin film pressure sensor 302 monitors the clamping force in real time. When the preset threshold is reached, the first electric push rod 3 stops advancing to prevent overpressure damage to the lens.
[0037] The two second electric actuators 801 are activated simultaneously to push the moving plate 6 upward, so that the suction cup 602 contacts the bottom of the lens through the alignment groove 4. The sliding plates 802 on both sides of the moving plate 6 slide along the slide rail 803 to ensure a smooth lifting process. Then, the air pump 9 is activated to draw air from the first suction pipe 601 and the second suction pipe 701 through the air pipe 901 and the connecting pipe 902, so that the suction cup 602 generates negative pressure to adsorb the lens. The damping spring 702 on the outside of the second suction pipe 701 provides buffering, so that the suction cup 602 fits tightly against the curved surface of the lens to compensate for the unevenness of the surface. The laser engraving equipment 102 is driven to move along the preset trajectory through the adjustment frame 101. The stability of adsorption and clamping ensures the accuracy of the engraved pattern.
[0038] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inner", "outer", "back", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0039] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.
Claims
1. A positioning fixture for laser engraving of a heart rate monitoring lens, comprising a processing table (1), a movable adjustment frame (101) disposed on the top of the processing table (1), and a laser engraving device (102) disposed on the outer wall of the adjustment frame (101), characterized in that: A lens placement area (2) is provided in the middle of the top of the processing table (1). A clamping mechanism and an adsorption positioning mechanism are provided at the top and bottom of the processing table (1), respectively. The clamping mechanism includes a first electric push rod (3) symmetrically distributed on both sides of the lens placement area (2) and fixed to the top of the processing table (1). The output end of the first electric push rod (3) is fixedly connected to a clamping plate (301). V-shaped grooves are provided on both sides of the two clamping plates (301). A thin film pressure sensor (302) is fixedly connected to the inner wall of the V-shaped groove of the clamping plate (301). A rubber pad (303) is fixedly connected to the side of the thin film pressure sensor (302) away from the V-shaped groove of the clamping plate (301). The processing table (1) has an alignment groove (4) located in the lens placement area (2) and smaller than the lens size on its top. The processing table (1) has a groove (5) communicating with the alignment groove (4) on its bottom. The adsorption positioning mechanism includes a movable plate (6) located inside the groove (5). The movable plate (6) has a first suction pipe (601) movable into the alignment groove (4) and a second suction pipe (701) symmetrically distributed on both sides of the first suction pipe (601). One end of the first suction pipe (601) passes through the movable plate (6) and is fixedly connected to the movable plate (6). The movable plate (6) has ports (7) slidably connected to the two first suction pipes (601) on its top. One end of the first suction pipe (601) and the second suction pipe (701) are connected to a suction cup (602) through a corrugated pipe.
2. The positioning fixture for laser engraving of a heart rate monitoring lens according to claim 1, characterized in that: A horizontal plate (8) located below the movable plate (6) is fixedly installed between the left and right side walls inside the groove (5). The width of the horizontal plate (8) is 1 / 3 of the width of the groove (5). Two symmetrically distributed second electric actuators (801) are fixedly connected to the top of the horizontal plate (8). The output ends of the two second electric actuators (801) are fixedly connected to the bottom of the movable plate (6).
3. The positioning fixture for laser engraving of a heart rate monitoring lens according to claim 1, characterized in that: The adsorption positioning mechanism also includes a fixed frame (103) in the shape of an inverted U, which is fixedly installed at the bottom of the processing table (1). An air pump (9) is fixedly installed at the bottom of the fixed frame (103). The output end of the air pump (9) is connected to an air pipe (901). Three connecting pipes (902) with solenoid valves are installed on the outer wall of the air pipe (901). The other end of the three connecting pipes (902) is connected to the first suction pipe (601) and two second suction pipes (701) respectively through a hose.
4. The positioning fixture for laser engraving of a heart rate monitoring lens according to claim 1, characterized in that: A support plate (703) is fixedly connected to the outer wall of the second air intake pipe (701), and a damping spring (702) sleeved on the outer wall of the second air intake pipe (701) is fixedly connected between the bottom of the support plate (703) and the top of the moving plate (6).
5. The positioning fixture for laser engraving of a heart rate monitoring lens according to claim 1, characterized in that: Both sides of the movable plate (6) are fixedly connected to U-shaped sliding plates (802), and the sliding plates (802) are slidably connected to slide rails (803) fixed to the inner wall of the groove (5).
6. The positioning fixture for laser engraving of a heart rate monitoring lens according to claim 1, characterized in that: The bottom of the clamping plate (301) is fixedly connected to a slider (305), and the outer wall of the slider (305) is slidably connected to a groove (304) opened on the top of the processing table (1), and one end of the groove (304) extends to the lens placement area (2).