A laser marking apparatus

Abstract

The application discloses a kind of laser marking equipment, it is related to laser marking technical field, including lower frame, the upper frame is equipped in the top of lower frame, the first threaded hole is opened in the top of lower frame near four corners, the connecting groove is opened in the top of upper frame near four corners, the second threaded hole is opened in the bottom of connecting groove, adjacent first threaded hole and second threaded hole are mutually through setting, adjacent first threaded hole and second threaded hole are jointly connected with bolt, by the mutual cooperation between the structure such as lower frame, upper frame, conveyor belt, marking machine, product can be placed on conveyor belt, conveyor belt drives product to move to the position of marking machine, light source illuminates product, can facilitate marking machine to judge the position of product and carry out laser marking processing, lower frame and upper frame have dismounting, facilitate the maintenance of the components inside device.

Description

Technical Field

[0001] This invention relates to the field of laser marking technology, specifically to a laser marking device. Background Technology

[0002] Laser marking is a marking method that uses high-energy-density laser light to locally irradiate a workpiece, causing the surface material to vaporize or undergo a chemical reaction that changes color, thus leaving a permanent mark. Laser marking is widely used in many industrial fields for marking serial numbers, barcodes, logos, and more. However, existing laser marking equipment has several problems. It is not convenient for precise laser marking of products; the internal lighting is poor, which may affect the operator's visual judgment and cause marking position deviation. Furthermore, during product transport, the product itself may shift, affecting the efficiency of the equipment. After work, it is also difficult to clean dust from the transport equipment. In addition, the equipment lacks a clear alarm mechanism for critical component failures, and the function of some duct structures is not clearly defined, affecting the overall practicality of the equipment. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the existing technology, the purpose of this invention is to provide a laser marking device.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a laser marking device.

[0005] Includes a lower frame, with an upper frame on top of the lower frame. The lower frame has first threaded holes near the four corners of its top, and the upper frame has connecting grooves near the four corners of its top. The bottom of each connecting groove has a second threaded hole. Adjacent first and second threaded holes are interconnected, and bolts are threaded into adjacent first and second threaded holes.

[0006] Two smoke extraction ports are fixedly connected at the center of the top of the upper frame, an alarm indicator light is fixedly connected near the rear side of the top of the upper frame, and a first air duct is fixedly connected near the front side of the top of the upper frame.

[0007] The lower frame has a first U-shaped block fixedly connected to both sides near the bottom. A first swing block is hinged to the inner cavity of the first U-shaped block. A cylinder is fixedly connected to one side of the first swing block. A second swing block is fixedly connected to the end of the cylinder away from the first U-shaped block. A second U-shaped block is hinged to the outer edge of the second swing block. A fan is fixedly connected to the top of the second U-shaped block. Two vertical rods are fixedly connected to the top of the fan. A fixing ring is fixedly connected to the top of each vertical rod. A hook is provided through the inner cavity of each fixing ring. A rope is fixedly connected to one side of each hook. The end of the rope away from the hook is fixedly connected to a pre-set connecting ring on the outer edge of the upper frame and the outer edge of the lower frame, respectively.

[0008] A laser marking device,

[0009] A groove is provided at the center of the top of the lower frame, and four conveyor belts are provided in the groove. Elastic U-shaped plates are fixedly connected to the left and right sides of the lower frame near the bottom.

[0010] A laser marking device,

[0011] The bottom of the upper frame has limit grooves near the left and right sides. The top of the inner cavity of each limit groove has four third threaded holes. The top of the conveyor belt has two L-shaped plates near the left and right sides. A horizontal plate is fixedly connected between two adjacent L-shaped plates. A fourth threaded hole is opened at the center of the horizontal plate. A threaded rod is threaded into each fourth threaded hole. The top of the threaded rod is threaded into the third threaded hole. A blind hole is opened on the side of the L-shaped plate away from the limit groove. A spring is fixedly connected in each blind hole. A magnet is fixedly connected to the end of the spring away from the L-shaped plate. Two adjacent magnets are fitted together.

[0012] A laser marking device,

[0013] Each L-shaped plate has an elastic plate fixedly connected to the side away from the magnet, and the elastic plate is located at the top of the conveyor belt. When the product size is smaller than the width of the conveyor belt, the product material is soft and easily shifts, or the marking position requires high precision (such as QR code or serial number marking), the product movement position needs to be limited. When limiting, a threaded rod passes through the fourth threaded hole of the horizontal plate and is threadedly connected to the third threaded hole at the top of the upper frame limiting groove to fix the L-shaped plate on the left and right sides of the top of the conveyor belt. Adjacent L-shaped plates are attracted to each other by magnets connected by springs. The distance between the two L-shaped plates can be adjusted according to the product width by the extension and contraction of the springs to adapt to products of different widths.

[0014] A laser marking device,

[0015] Two marking platforms are fixedly connected to the top of the lower frame near the front and rear sides. A marking machine is provided on one side of the marking platform, and a light source is provided on the other side of the marking machine. A coaxial vision camera is provided on the top of each light source. Two air duct supports are fixedly connected to the top of the lower frame, and two second air ducts are provided on each air duct support.

[0016] The first air duct works in conjunction with the second air duct. The second air duct is fixed to the side of the marking platform by the air duct bracket and is used to absorb the local fumes generated during laser marking. The first air duct absorbs the fumes that diffuse inside from the top of the equipment for a second time. Together, they exhaust the fumes to the outside of the equipment to avoid the fumes affecting the marking accuracy or endangering the health of the operators.

[0017] The light source works in conjunction with a coaxial vision camera to adjust the position of the marking machine: the coaxial vision camera captures images of the product's position on the conveyor belt and transmits the image data to the control box, which analyzes the deviation between the actual position of the product and the preset marking position; the light source provides uniform illumination, eliminates shadows on the product surface, ensures clear images captured by the camera, and reduces errors in deviation analysis; based on the deviation signal, the control box drives the X / Y axis motors of the marking machine to adjust the horizontal position of the marking machine, so that the marking head is accurately aligned with the marking area of ​​the product.

[0018] A laser marking device,

[0019] Two first storage slots are provided on the front side of the lower frame near the right side, a second storage slot is provided on the front side of the lower frame near the left side, and two third storage slots are provided on the rear side of the lower frame. Two control boxes are provided in each of the second and third storage slots, and two chillers are provided in each of the first storage slots.

[0020] The fault triggering mechanism of the alarm indicator light is as follows: The control box is connected to sensors of the marking machine, conveyor belt, chiller, and fan. The alarm indicator light will activate when the following faults are detected:

[0021] The laser power sensor of the marking machine detected an abnormal power (higher / lower than the preset threshold).

[0022] The conveyor belt's speed sensor detected a jam or a speed deviation from the set value;

[0023] The water temperature sensor in the chiller detected a water temperature exceeding 60°C;

[0024] The fan's speed sensor detected a speed of 0 (stopped);

[0025] When a fault occurs, the sensor transmits a signal to the control box, which then controls the alarm indicator light to flash red, and simultaneously displays the fault type on the debugging computer.

[0026] A laser marking device,

[0027] A debugging computer is installed on the left side of the upper frame near the front, and three support columns are fixedly connected to the bottom of the lower frame near the front and rear sides.

[0028] The dust cleaning process for the conveyor belt after work is as follows: The operator rotates the bolts to remove them from the first and second threaded holes, and dismantles the upper frame (at this time, the rope remains connected to the blower because one end is fixed to the lower frame connecting ring); the cylinder is activated, which pushes the first swing block to swing around the first U-shaped block, while simultaneously moving the second swing block, the second U-shaped block, and the blower, adjusting the blower to a position at a 45° angle with the conveyor belt; the hook is passed through the fixing ring, and the blower position is fixed by the rope to prevent it from shifting during blowing; the blower is started to blow air evenly on the top of the conveyor belt to clean the surface dust; compared with manually using a blower, this structure achieves automatic blower positioning through a cylinder, ensuring a stable blowing angle, improving the uniformity of dust cleaning by 30%, and eliminating the need for manual handling of the equipment, thus reducing operational intensity.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] This invention, through the cooperation of structures such as the lower frame, upper frame, conveyor belt, and marking machine, enables products to be placed on the conveyor belt, which then moves the products to the position of the marking machine. The light source illuminates the products, allowing the marking machine to easily determine the position of the products for laser marking. The lower frame and upper frame are detachable, facilitating the maintenance and repair of the internal components.

[0031] By using the interplay of L-shaped plates, springs, fans, cylinders, and other structural components, the L-shaped plates can be installed on the upper frame via threaded rods. The bottom of the L-shaped plates is attached to the top of the conveyor belt, and the left and right L-shaped plates are connected by springs and magnets. When the product is placed on the conveyor belt, the two L-shaped plates will limit the product's position and prevent displacement. After the work is completed, the position of the fan is adjusted by the cylinder, and then the fan is limited by hooks and ropes, aligning it with the top of the conveyor belt. The fan blows away and cleans the dust on the top of the conveyor belt. Attached Figure Description

[0032] Figure 1 This is a perspective view of the present invention;

[0033] Figure 2 This is a bottom-view perspective view of the present invention;

[0034] Figure 3 This is an exploded view of the present invention;

[0035] Figure 4 This is a schematic diagram of the upper frame structure of the component of the present invention;

[0036] Figure 5This is a schematic diagram of the lower frame structure of the component of the present invention;

[0037] Figure 6 This is a schematic diagram of the marking platform structure for the components of this invention;

[0038] Figure 7 This is a schematic diagram of the marking machine structure for the components of this invention;

[0039] Figure 8 This is a schematic diagram of the duct support structure of the component of the present invention;

[0040] Figure 9 This is a schematic diagram of the conveyor belt structure of the component of the present invention;

[0041] Figure 10 This is a schematic diagram of the fan structure of the component of the present invention;

[0042] Figure 11 This is a schematic diagram of the cylinder structure of the component of the present invention;

[0043] Figure 12 This is a schematic diagram of the L-shaped plate structure of the component of the present invention;

[0044] Figure 13 This is a rear-view perspective view of the present invention.

[0045] Numbered in the diagram: 1. Lower frame; 2. Upper frame; 3. Alarm indicator light; 4. Smoke extraction port; 5. First air duct; 6. Debugging computer; 7. Chiller; 8. Control box; 9. Flexible U-shaped plate; 10. Conveyor belt; 11. Bolt; 12. Marking platform; 13. Marking machine; 14. Light source; 15. Coaxial vision camera; 16. Air duct support; 17. Second air duct; 18. First U-shaped block; 19. First swing block; 20. Cylinder; 21. Fan; 22. Fixing ring; 23. Vertical rod; 24. Hook; 25. Rope; 26. Second U-shaped block; 27. Second swing block; 28. L-shaped plate; 29. ​​Spring; 30. Magnet; 31. Flexible plate; 32. Horizontal plate; 33. Threaded rod; 34. Support column. Detailed Implementation

[0046] 1. This embodiment takes the laser marking of QR codes on the aluminum alloy shell of mobile phones as an example. It needs to achieve high-precision marking (QR code deviation ≤ 0.1mm), smoke collection during the marking process, real-time early warning of equipment failure, and dust cleaning of the conveyor belt after marking. It is suitable for mass production where the shell size is uniform (width 60mm, length 150mm) but is prone to deviation due to conveyor belt vibration.

[0047] 2. Equipment assembly and initialization

[0048] 2.1 Rack and Core Component Assembly

[0049] Place the lower frame 1 on a level workshop floor and level it using the six bottom support columns 34 (ensure that the horizontal error of the conveyor belt 10 table surface is ≤0.5mm).

[0050] At the corresponding position of the bottom limiting groove of the upper frame 2, four sets of L-shaped plates 28 are fixed by threaded rods 33: the threaded rods 33 pass through the fourth threaded hole of the horizontal plate 32 and are threadedly connected to the third threaded hole at the top of the limiting groove of the upper frame 2 (torque 5 N·m), so that the elastic plate 31 at the bottom of the L-shaped plate 28 fits against the surface of the conveyor belt 10, and the distance between the two sets of L-shaped plates 28 is adjusted to 65 mm (to adapt to the width of the mobile phone case, leaving 5 mm of movement space); the adjacent L-shaped plates 28 are attracted to each other by magnets 30 connected by springs 29, and the springs 29 are in a slightly tense state (extension amount 2 mm) to ensure that the case is not jammed during conveying;

[0051] The upper frame 2 is fastened to the top of the lower frame 1, so that the first threaded hole of the lower frame 1 is aligned with the second threaded hole of the upper frame 2, and connected by 4 bolts 11 (tightening torque 8 N·m).

[0052] Install the relevant components of the fan 21: Hinge the fan 21 to the second swing block 27 via the second U-shaped block 26. Fix the second swing block 27 to one end of the cylinder 20. Hing the other end of the cylinder 20 to the first U-shaped block 18 of the lower frame 1 via the first swing block 19. Fix one end of the rope 25 to the preset hole on the outside of the upper frame 2 and the other end to the preset connecting ring on the outside of the lower frame 1. Pass the hook 24 through the fixing ring 22 of the top vertical rod 23 of the fan 21 so that the fan 21 is initially suspended on the side of the lower frame 1 (300mm away from the conveyor belt 10).

[0053] 2.2 Auxiliary System Connection

[0054] Install a second air duct 17 on the air duct support 16 on both sides of the marking platform 12, so that the suction port of the second air duct 17 is directly facing the marking area (15mm spacing, 45° angle); the first air duct 5 is connected to the main exhaust pipe of the workshop (the wind speed is adjusted to 8m / s), forming a "local + top" two-stage smoke collection with the second air duct 17;

[0055] Two control boxes 8 are respectively embedded in the second storage slot (front left side) and the third storage slot (rear side) of the lower frame 1. The control box 8 integrates a PLC controller, a motor driver and a sensor signal receiver, which are respectively connected to the sensors of the marking machine 13, the conveyor belt 10, the chiller 7 and the fan 21.

[0056] Install the marking control software (version V2.0) on the debugging computer 6, connect it to the control box 8 via Ethernet, import the QR code marking pattern on the mobile phone shell (resolution 300 DPI), and preset the marking position (center area of ​​the front of the shell).

[0057] 3. Product Marking Operation Procedure

[0058] 3.1 Preprocessing and Parameter Setting

[0059] Start the chiller 7 (embedded in the first storage slot of the lower frame 1), set the water temperature control range to 25-35℃, and start the marking machine 13 (laser power 10W, marking speed 500mm / s) after the water temperature stabilizes at 30℃.

[0060] Turn on the light source 14 (power 15W, color temperature 5500K) and the coaxial vision camera 15 (resolution 2 million pixels). Calibrate via the debugging computer 6: Place a standard sample (with reference crosshairs) on the conveyor belt 10, the coaxial vision camera 15 captures the sample image, and transmits it to the control box 8. The control box 8 analyzes the deviation between the crosshairs and the preset marking position, and drives the X / Y axis motors (step distance 0.01mm) of the marking machine 13 to adjust until the deviation is ≤0.05mm.

[0061] 3.2 Batch Marking Execution

[0062] The aluminum alloy casings of mobile phones are placed one by one on the conveyor belt 10, and the casings are guided and conveyed along the elastic plate 31 of the L-shaped plate 28 (the speed of the conveyor belt 10 is 100mm / s).

[0063] When the shell moves above the marking platform 12, the coaxial vision camera 15 captures the shell position image in real time. If the shell offset is detected (e.g., X-axis offset of 0.08mm), the control box 8 immediately sends a signal to the servo motor of the conveyor belt 10 to finely adjust the lateral position of the conveyor belt 10 (compensation of 0.08mm). At the same time, the light source 14 remains constantly lit to eliminate reflections and shadows on the shell surface and ensure the camera recognition accuracy.

[0064] The marking machine 13 marks the adjusted shell with a QR code. During the marking process, the second air duct 17 (wind speed 5m / s) absorbs the aluminum alloy dust (main component is Al2O3) generated by the marking. The diffused dust that is not absorbed is discharged from the top of the equipment through the first air duct 5 (wind speed 8m / s) to avoid dust adhering to the marking head or the surface of the shell.

[0065] The marked shells are output by conveyor belt 10 and enter the subsequent inspection process. Conveyor belt 10 continuously transports the shells to achieve batch marking (processing 300 pieces per hour).

[0066] 4. Fault Detection and Alarm Handling

[0067] 4.1 Fault Triggering Conditions and Responses

[0068] Abnormal laser power of marking machine: If the power sensor of marking machine 13 detects that the power has dropped to 8W (below the preset threshold of 10W±5%), the sensor will transmit the signal to the control box 8. The control box 8 will immediately control the alarm indicator 3 to emit a red flashing light (frequency 2 times / second). At the same time, the debugging computer 6 will pop up a "low laser power" fault message. Marking machine 13 will automatically stop. The operator needs to check the laser tube cooling water circuit (whether the chiller 7 is supplying water normally).

[0069] Conveyor belt jamming: If the speed sensor of conveyor belt 10 detects that the speed has dropped to 50mm / s (below the set value of 100mm / s), the alarm indicator 3 will flash red, the debugging computer 6 will display "conveyor belt overload", the control box 8 will control the conveyor belt 10 to stop, and the operator needs to clean the foreign objects (such as residual dust) on the surface of the conveyor belt 10.

[0070] Chiller water temperature too high: If the water temperature sensor of chiller 7 detects that the water temperature has risen to 38℃ (higher than the upper limit of 35℃), the alarm indicator 3 will flash red, the debugging computer 6 will prompt "chiller heat dissipation failure", and the equipment will automatically reduce the power of the marking machine 13 to 5W. The operator needs to check the cooling fan of chiller 7.

[0071] Fan stops: If the speed sensor of fan 21 detects a speed of 0, the alarm indicator 3 flashes red, and the debugging computer 6 displays "Fan failure". This does not affect the marking process, but the power supply of fan 21 needs to be inspected after the batch marking is completed.

[0072] 5. Equipment cleaning and maintenance (after the marking batch is completed)

[0073] 5.1 Conveyor Belt Dust Cleaning

[0074] After shutting down the conveyor belt 10, the marking machine 13, and the light source 14, the operator used a wrench to unscrew the four bolts 11 and removed the upper frame 2 upwards (at this time, the rope 25, because one end is fixed to the connecting ring of the lower frame 1, still maintains the pull on the fan 21 to prevent the fan 21 from shaking).

[0075] Start cylinder 20 (working pressure 0.6MPa), cylinder 20 pushes the first swing block 19 to swing counterclockwise around the first U-shaped block 18 by 30°, and at the same time drives the second swing block 27, the second U-shaped block 26 and the fan 21 to move, so that the air outlet of the fan 21 forms a 45° angle with the surface of the conveyor belt 10 (distance 100mm).

[0076] Pass the hook 24 completely through the fixing ring 22, tighten the rope 25 to fix the position of the blower 21 (to prevent the blower 21 from shifting when blowing air), start the blower 21 (wind speed 12m / s), and blow air continuously on the surface of the conveyor belt 10 for 30 seconds to clean the aluminum alloy dust remaining during the marking process.

[0077] After cleaning, turn off the fan 21, retract the cylinder 20 to reset the fan 21, re-fasten the frame 2 and tighten the bolts 11.

[0078] 5.2 Duct Maintenance

[0079] Remove the end filters of the first duct 5 and the second duct 17, and blow away the dust on the surface of the filters with compressed air (0.4MPa) to ensure that the flue gas collection efficiency is not less than 90%. Reinstall the filters after maintenance.

Claims

1. A laser marking device The machine frame (1) comprises a lower frame (1), characterized in that: The lower frame (1) is provided with an upper frame (2) at the top. The lower frame (1) is provided with a first threaded hole at each of the four corners near the top. The upper frame (2) is provided with a connecting groove at each of the four corners near the top. The bottom of the connecting groove is provided with a second threaded hole. The adjacent first threaded holes and second threaded holes are interconnected. The adjacent first threaded holes and second threaded holes are connected by a bolt (11) through the thread. Two smoke extraction ports (4) are fixedly connected at the center of the top of the upper frame (2), an alarm indicator light (3) is fixedly connected at the rear side of the top of the upper frame (2), and a first air duct (5) is fixedly connected at the front side of the top of the upper frame (2). The lower frame (1) is fixedly connected to the bottom of the left and right sides with a first U-shaped block (18). The inner cavity of the first U-shaped block (18) is hinged with a first swing block (19). A cylinder (20) is fixedly connected to one side of the first swing block (19). The end of the cylinder (20) away from the first U-shaped block (18) is fixedly connected with a second swing block (27). The outer edge of the second swing block (27) is hinged with a second U-shaped block (26). The top of the second U-shaped block (26) is fixedly connected with a fan (21). The top of the fan (21) is fixedly connected with two vertical rods (23). The top of the vertical rods (23) is fixedly connected with a fixing ring (22). The inner cavity of the fixing ring (22) is provided with a hook (24). The side of the hook (24) is fixedly connected with a rope (25). The end of the rope (25) away from the hook (24) is fixedly connected to the connecting rings preset on the outer edge of the upper frame (2) and the outer edge of the lower frame (1).

2. A laser marking device according to claim 1 characterized in that The lower frame (1) has a groove at the top center, and four conveyor belts (10) are provided in the groove. Elastic U-shaped plates (9) are fixedly connected to the left and right sides of the lower frame (1) near the bottom.

3. A laser marking device according to claim 2 characterized in that The upper frame (2) has a limit groove on the bottom near the left and right sides. The top of the limit groove has four third threaded holes. The top of the conveyor belt (10) has two L-shaped plates (28) near the left and right sides. A horizontal plate (32) is fixedly connected between two adjacent L-shaped plates (28). A fourth threaded hole is opened at the center of the horizontal plate (32). A threaded rod (33) is threadedly connected in the fourth threaded hole. The top of the threaded rod (33) is threadedly connected in the third threaded hole. A blind hole is opened on the side of the L-shaped plate (28) away from the limit groove. A spring (29) is fixedly connected in the blind hole. A magnet (30) is fixedly connected to the end of the spring (29) away from the L-shaped plate (28). Two adjacent magnets (30) are fitted together.

4. A laser marking device according to claim 3 characterized in that On the side of the L-shaped plate (28) away from the magnet (30), an elastic plate (31) is fixedly connected. The elastic plate (31) is located at the top of the conveyor belt (10). When the product size is smaller than the width of the conveyor belt (10), the product material is soft and easy to deviate, or the marking position requires high precision, the product movement position needs to be limited. When limiting, the threaded rod (33) passes through the fourth threaded hole of the horizontal plate (32) and is threadedly connected to the third threaded hole at the top of the limiting groove of the upper frame (2), fixing the L-shaped plate (28) on the left and right sides of the top of the conveyor belt (10). The magnets (30) connected by the spring (29) of the adjacent L-shaped plates (28) attract each other. The distance between the two L-shaped plates (28) can be adjusted by the extension and retraction of the spring (29) according to the product width to adapt to products of different widths.

5. A laser marking device according to claim 2 Its features are: Two marking platforms (12) are fixedly connected to the top of the lower frame (1) near the front and rear sides. A marking machine (13) is provided on one side of the marking platform (12), and a light source (14) is provided on one side of the marking machine (13). A coaxial vision camera (15) is provided on the top of each light source (14). Two air duct supports (16) are fixedly connected to the top of the lower frame (1), and two second air ducts (17) are provided on each air duct support (16). The first air duct (5) and the second air duct (17) are used together. The second air duct (17) is fixed next to the marking platform (12) by the air duct bracket (16) to absorb the local smoke generated during laser marking. The first air duct (5) absorbs the smoke diffused inside from the top of the equipment for a second time, and together they exhaust the smoke outside the equipment to avoid the smoke affecting the marking accuracy or harming the health of the operators. The light source (14) works in conjunction with the coaxial vision camera (15) to adjust the position of the marking machine (13): the coaxial vision camera (15) captures the position image of the product on the conveyor belt (10) and transmits the image data to the control box (8). The control box (8) analyzes the deviation between the actual position of the product and the preset marking position. The light source (14) provides uniform illumination, eliminates shadows on the product surface, ensures that the image captured by the camera is clear, and reduces the error in deviation analysis. According to the deviation signal, the control box (8) drives the X / Y axis motor of the marking machine (13) to adjust the horizontal position of the marking machine (13) so that the marking head is accurately aligned with the marking area of ​​the product.

6. A laser marking device according to claim 1 Its features are: Two first storage slots are provided on the front side of the lower frame (1) near the right side, and a second storage slot is provided on the front side of the lower frame (1) near the left side. Two third storage slots are provided on the rear side of the lower frame (1). Two control boxes (8) are provided in both the second and third storage slots, and two chillers (7) are provided in both the first storage slots. The fault triggering mechanism of the alarm indicator (3) is as follows: The control box (8) is connected to the sensors of the marking machine (13), conveyor belt (10), chiller (7), and fan (21) respectively. When the following faults are detected, the alarm indicator (3) is activated: The laser power sensor of the marking machine (13) detected an abnormal power. The speed sensor of the conveyor belt (10) detected a jam or a speed deviation from the set value; The water temperature sensor of the chiller (7) detected that the water temperature exceeded 60°C; The speed sensor of the fan (21) detected a speed of 0; When a fault occurs, the sensor transmits a signal to the control box (8), and the control box (8) controls the alarm indicator (3) to emit a red flashing light, while the fault type is displayed on the debugging computer (6).

7. A laser marking device according to claim 1 Its features are: A debugging computer (6) is installed on the left side of the upper frame (2) near the front side, and three support columns (34) are fixedly connected to the bottom of the lower frame (1) near the front and rear sides. The dust cleaning process for the conveyor belt (10) after the work is finished is as follows: The operator rotates the bolt (11) and removes the bolt (11) from the first threaded hole and the second threaded hole, and removes the upper frame (2); the cylinder (20) is started, and the cylinder (20) pushes the first swing block (19) to swing around the first U-shaped block (18), while driving the second swing block (27), the second U-shaped block (26) and the fan (21) to move, and adjusts the fan (21) to a position at a 45° angle with the conveyor belt (10); the hook (24) is passed through the fixing ring (22), and the position of the fan (21) is fixed by the rope (25) to prevent it from shifting when blowing; the fan (21) is started to blow air evenly on the top of the conveyor belt (10) to clean the surface dust; compared with manually using a blower, this structure realizes the automatic positioning of the fan (21) through the cylinder (20), the blowing angle is stable, the dust cleaning uniformity is improved by 30%, and there is no need for manual handling of equipment, reducing the intensity of operation.

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