A laser safety device for denture carving

Abstract

This invention relates to the field of laser sensor technology, specifically to a laser protection device for dental prosthesis carving. It includes a laser emitter and a laser receiver positioned on either side of a carving machine. The laser emitter includes an emitter base, an emitter module installed within the emitter base, and a first protective box mounted on the emitter base. The emitter module has at least three laser emission points, each equipped with a spherical inner mirror. The first protective box has through holes corresponding to the inner mirrors. A control shaft is rotatably mounted inside the first protective box, and a spherical outer mirror located within the through holes is mounted on the control shaft. A scraper is adhered to the inner wall of the through holes, making close contact with the outer wall of the outer mirror. The laser receiver includes a receiver base, a receiver module installed within the receiver base, and a second protective box mounted on the receiver base. The receiver module has at least three laser receiving points, each equipped with a wide-face mirror. This device provides stable protection.

Description

Technical Field

[0001] This invention relates to the field of laser sensor technology, specifically to a laser protection device for dental prosthesis carving. Background Technology

[0002] Dental prosthesis carving is a crucial step in the fabrication of dental prostheses. Carving equipment transforms raw denture blanks into precise prostheses that conform to the patient's oral cavity shape. Laser carving, due to its advantages such as non-contact operation, high precision, and no tool wear, is increasingly being used for the fine carving of dentures. However, the high-temperature molten material and flying debris generated during laser carving can not only contaminate the processing environment but also pose safety hazards. If foreign objects accidentally enter the laser processing area, it can lead to accidents. Therefore, equipping dental laser carving equipment with reliable laser protection devices to monitor the safety status of the processing area and promptly shut down the machine in case of foreign objects entering is an important measure to ensure the safety of both equipment and operators.

[0003] Currently available laser protection devices mostly employ simple through-beam photoelectric sensors or grating structures. A protective zone is formed by the laser beam between the transmitter and receiver, triggering a shutdown protection mechanism when the beam is blocked. However, these existing devices have significant drawbacks when applied to dental prosthesis carving environments: First, the carving process generates a large amount of ceramic, resin, or metal debris. This debris flies in the air and easily adheres to the lens surface of the laser protection device, leading to decreased laser transmittance, weakened or interrupted signal at the receiver, and frequent false alarms, severely impacting normal carving efficiency. Second, the lenses of existing devices are mostly planar, making it difficult for debris to detach on its own, and they lack effective online cleaning mechanisms, requiring frequent manual shutdowns for wiping, increasing maintenance workload. Summary of the Invention

[0004] The purpose of this invention is to provide a laser protection device for dental prosthesis carving, so as to achieve precise protection and solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a laser protection device for dental prosthesis carving, comprising a laser emitter and a laser receiver disposed on both sides of a carving machine, the laser emitter comprising an emitter base, an emitter module installed in the emitter base, and a first protective box assembled on the emitter base, the emitter module having at least three laser emission points, each laser emission point having a spherical inner mirror, the laser beam entering along the radius direction of the inner mirror; The first protective box has through holes that correspond one-to-one with the inner spherical mirror. A control shaft is rotatably installed inside the first protective box. A spherical outer spherical mirror is installed on the control shaft and located inside the through hole. A scraper that is in close contact with the outer wall of the outer spherical mirror is adhered to the inner wall of the through hole. A motor that drives the control shaft to rotate is installed at the top of the first protective box. The laser receiver includes a receiver base, a receiver module installed in the receiver base, and a second protective box mounted on the receiver base. The receiver module has at least three laser receiving points, and each laser receiving point is equipped with a wide-face mirror. The launcher and the top of the first protective box are equipped with an air inlet pipe for connecting an external air supply device to introduce high-pressure airflow. The launcher has a first bottom groove at the bottom, and the first protective box has a second bottom groove at the bottom.

[0006] Preferably, two scrapers are adhered to the inner wall of the through hole. Both scrapers are circular ring structures and are located on the front and rear sides of the outer spherical lens, respectively. The outer wall of the outer sphere is in close contact with the scraper, which continuously cleans the surface of the outer sphere as it rotates.

[0007] Preferably, the air inlet pipe has a multi-channel structure, which is connected to the interior of the launcher and the first protective box respectively. The first bottom groove at the bottom of the launcher and the second bottom groove at the bottom of the first protective box form an ash discharge channel for high-pressure airflow to carry debris out.

[0008] Preferably, the second protective box has a protruding hole on the side facing the receiver base, and a slanted hole on the side away from the receiver base. The protruding hole and the slanted hole correspond one-to-one and are at the same height as the laser receiving point. Rubber rings are glued to the inner walls of both the convex and beveled holes. A protective mirror located between the convex and beveled holes is installed in the second protective box via a rotating shaft. The outer ring of the protective mirror is clamped between the two rubber rings.

[0009] Preferably, each protective goggle is equipped with a pulley on its rotating shaft, and all pulleys are synchronously connected by a belt. One of the protective goggles' rotating shafts is connected to a motor, and the motor drives all the protective goggles to rotate synchronously through the pulleys and belt, so that the protective goggles continuously switch their light-transmitting positions under the scraping of the rubber ring.

[0010] Preferably, a cover is provided on the surfaces of the first protective box and the second protective box facing each other. The cover is installed on the side wall of the first protective box or the second protective box by a side seat. A door hinge is provided on the side of the cover, and a gear is installed at the bottom of the door hinge. The cover rotates around the door hinge to open or close.

[0011] Preferably, both the bottom of the first protective box and the second protective box are provided with a drive assembly. The drive assembly includes a limiting rail, a slide block slidably installed in the limiting rail, spring guide rods passing through both sides of the slide block, and an extension rod fixed to the side of the slide block. One end of the extension rod is equipped with a rack that meshes with the gear, and the other end of the extension rod is equipped with an end block facing the material door. The spring guide rod uses its elasticity to reset the slide when the material door is opened, driving the rack to keep the cover open. When the material door is closed, the end block is pushed to push the extension rod inward, and the rack drives the gear to rotate and close the cover.

[0012] Preferably, a support assembly is installed at the bottom of the launcher and the first protective box, and a bottom cover for closing the first bottom groove and the second bottom groove is movably installed on the support assembly. The support assembly has an elastic rubber pad to elastically support the bottom cover. A center seat is provided at the center of the bottom surface of the bottom cover, and a triangular groove is provided in the middle of the center seat. A push rod is also fixed on the slide of the first protective box. The push rod is inserted into the triangular groove. When the slide moves to reset, the push rod pushes the bottom cover to open against the elastic force through the triangular groove. When the slide is pushed inward, the push rod disengages from the triangular groove, and the bottom cover closes the bottom groove under the action of the elastic force.

[0013] Preferably, the electrical control system of the dental prosthesis engraving machine is electrically connected to the laser emitter and laser receiver. When the material door is detected to be open, the electrical control system powers on the laser emitter and laser receiver to make them work, and cuts off the power when the material door is closed. At the same time, the protective cover opens or closes in conjunction with the material door.

[0014] Preferably, both the upper and lower ends of the transmitter and receiver are welded and fixed with a fixing frame, and the transmitter and receiver are fixed to the two sides of the engraving machine near the material inlet and outlet by the fixing frame and screws.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The laser protection device uses laser emitters and receivers installed on both sides of the material inlet and outlet of the dental prosthesis carving machine. It automatically powers on and opens the protective cover when the material door is opened, forming a laser monitoring area using at least three laser emission points. When a foreign object enters the carving machine and blocks the laser, the receiver is interrupted, and a shutdown alarm is immediately triggered, achieving proactive monitoring and safety protection against the risk of foreign object entry during the carving process. A rotatable outer spherical mirror is installed inside the first protective box, and a scraper is installed on the inner wall of the through-hole. A motor drives the control shaft to continuously rotate the outer spherical mirror, and the scraper continuously cleans the surface of the mirror. Simultaneously, high-pressure airflow is introduced through air intake pipes installed on the emitter and the top of the first protective box, which, together with the first and second bottom grooves, blows out debris. This effectively solves the problem of debris from dental prosthesis carving adhering to the lens surface and affecting laser transmission, avoiding false alarms caused by debris obstruction.

[0016] 2. By using inner and outer spherical lenses, debris is less likely to adhere and easier to clean. A wide-face mirror is set at the receiving end to form a large photosensitive surface, ensuring reliable signal reception even if the laser undergoes slight refraction, thus improving the stability and reliability of the protective device.

[0017] 3. By installing a rotatable protective mirror in the second protective box of the receiver base, the protective mirror is clamped between rubber rings and rotates synchronously through pulleys and belts. The rubber rings scrape off debris from the surface of the protective mirror while maintaining a seal, preventing debris from entering the receiver base.

[0018] 4. By setting up a drive component linked to the material door, the opening and closing of the protective cover and the opening and closing of the bottom cover are controlled by the opening and closing action of the material door. At the same time, the electrical control system only powers the laser emitter and laser receiver when the material door is open. When the material door is closed, the protective cover is closed and the device does not work, which realizes automated control and reduces unnecessary energy consumption and debris pollution. Furthermore, by setting a bottom cover controlled by the drive component at the bottom of the emitter base and the first protective box, when the material door is open, the push rod pushes the bottom cover open through the triangular groove to discharge debris with the airflow. When the material door is closed, the bottom cover elastically seals the first bottom groove and the second bottom groove, further ensuring the sealing and cleaning effect of the device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the position of the laser protective device of the present invention in the dental prosthesis carving machine.

[0020] Figure 2 This is a schematic diagram of the overall structure of the laser protection device of the present invention.

[0021] Figure 3 This is a first schematic diagram of the laser emitter of the present invention in the open state.

[0022] Figure 4 This is a second schematic diagram of the laser emitter of the present invention in the open state.

[0023] Figure 5 This is a schematic diagram of the transmitting module and the endoscope of the present invention.

[0024] Figure 6 This is a schematic diagram of the outer spherical lens and the first protective box structure of the present invention.

[0025] Figure 7 This is a schematic diagram of the internal structure of the first protective box of the present invention.

[0026] Figure 8 This is a schematic diagram of the laser receiver of the present invention in the open state.

[0027] Figure 9 This is a schematic diagram of the receiving module and wide-face mirror structure of the present invention.

[0028] Figure 10 This is a schematic diagram of the second protective box structure of the present invention.

[0029] Figure 11 This is a first schematic diagram of the internal structure of the second protective box of the present invention.

[0030] Figure 12 This is a second schematic diagram of the internal structure of the second protective box of the present invention.

[0031] Figure 13This is a schematic diagram of the control structure of the upper cover of the laser emitter of the present invention.

[0032] Figure 14 This is a schematic diagram of the push rod mounting structure of the present invention.

[0033] In the diagram: 1. Transmitter mount; 2. Receiver mount; 3. Mounting bracket; 4. Transmitter module; 5. Inner spherical mirror; 6. Sealing slot; 7. First protective box; 8. Through hole; 9. Control shaft; 10. Outer spherical mirror; 11. Scraper; 12. Motor mount; 13. Air inlet pipe; 14. First bottom groove; 15. Second bottom groove; 16. Receiver module; 17. Wide-face mirror; 18. Second protective box; 19. Protruding hole; 20. Angled hole; 21. Rubber ring; 22. Protective mirror; 23. Pulley; 24. Belt; 25. Side seat; 26. Protective cover; 27. Gear; 28. Limiting rail; 29. ​​Slide seat; 30. Spring guide rod; 31. Extension rod; 32. Rack; 33. End block; 34. Push rod; 35. Support assembly; 36. Bottom cover; 37. Center seat; 38. Triangular groove. Detailed Implementation

[0034] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. It should be understood that the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1 to 14 The present invention provides a technical solution: a laser protection device for dental prosthesis carving. The laser protection device is installed near the material inlet and outlet of the dental prosthesis carving machine. It works automatically when the dental prosthesis carving machine is open. It can monitor whether foreign objects have entered the carving machine through laser and feed back the monitoring results to the carving machine, so as to play a safety protection role.

[0036] The laser protection device consists of a laser emitter and a laser receiver placed on both sides of the engraving machine. The laser emitter emits a laser beam, which is then received by the laser receiver. If a foreign object enters the engraving machine and poses a risk, it will block the laser beam. If the laser receiver interrupts the reception, the result will be fed back to the engraving machine, causing it to stop in an emergency and issue an alarm.

[0037] The laser transmitter and laser receiver are based on upright transmitter base 1 and receiver base 2, respectively. The upper and lower ends of transmitter base 1 and receiver base 2 are welded and fixed with mounting brackets 3. The two are fixed to the two sides of the engraving machine near the material inlet and outlet by mounting brackets 3 and screws, forming a laser protection mechanism.

[0038] The transmitter module 4 is fixedly installed inside the transmitter base 1 with screws. The transmitter module 4 has three laser emission points, and each laser emission point is equipped with an inner spherical lens 5. The inner spherical lens 5 is a spherical lens. During installation, it seals the laser emission point inside to prevent dust from entering the transmitter module 4. During installation, it ensures that the laser enters along the radial direction of the inner spherical lens 5 to avoid laser refraction and deflection.

[0039] A sealing groove 6 is welded and fixed to the inner wall of the launcher 1. A first protective box 7 is assembled and installed on the launcher 1 through the sealing groove 6. The first protective box 7 is oriented towards the receiver 2. A through hole 8 is provided on the first protective box 7, with three through holes 8, each corresponding to an inner spherical lens 5 at the same height. Bearings are installed on the upper and lower sides of the first protective box 7. A control shaft 9 is vertically mounted in the first protective box 7 through the bearings. The control shaft 9 is not a continuous structure. Three outer spherical lenses 10 are set in the control shaft 9. The control shaft 9 is connected to the upper and lower ends of the outer spherical lenses 10. The outer spherical lenses 10 are located in the through holes 8. The outer spherical lenses 10 are also spherical lenses, at the same height as the inner spherical lens 5, and are bonded to the inner wall of the through hole 8. Two scraper blades 11 are provided, each with a circular structure. The outer wall of the outer spherical mirror 10 is in close contact with the scraper blades 11. At the same time, a motor base 12 is provided at the top of the first protective box 7 to install the motor. The control shaft 9 is connected to the motor, and the motor drives the control shaft 9 and the outer spherical mirror 10 to rotate. During the rotation, the scraper blades 11 can continuously clean the outer spherical mirror 10 to ensure the light transmittance of the outer spherical mirror 10. This is because during the denture carving process, the generated debris will continuously adhere to the surface of the outer spherical mirror 10. The rotation of the scraper blades 11 and the outer spherical mirror 10 ensures the smooth passage of the laser and avoids false alarms. In addition, the close contact between the scraper blades 11 and the outer spherical mirror 10 can also effectively reduce the debris that enters the first protective box 7 and the transmitter base 1 as the outer spherical mirror 10 rotates.

[0040] Furthermore, a multi-channel air inlet pipe 13 is installed on the top of the launcher 1 and the first protective box 7. The air inlet pipe 13 is connected to an air supply device, allowing high-pressure airflow to be introduced into the launcher 1 and the first protective box 7 to remove fine debris adhering to the inner spherical lens 5 and the outer spherical lens 10. The surfaces of the inner spherical lens 5 and the outer spherical lens 10 are curved, making them less prone to adhesion and easier to clean compared to flat lenses. Correspondingly, a first bottom groove 14 is provided at the bottom of the launcher 1, and a second bottom groove 15 is provided at the bottom of the first protective box 7 to ensure airflow and serve as a dust discharge channel.

[0041] A receiving module 16 is fixedly installed in the cavity of the receiving base 2 by screws. The receiving module 16 has three laser receiving points, and each laser receiving point is equipped with a wide-face mirror 17 for sealing and protection. The wide-face mirror 17 forms a large photosensitive surface, ensuring that even if the laser is slightly refracted due to the deviation between the inner spherical mirror 5 and the outer spherical mirror 10, the laser signal can still be received.

[0042] A sealing groove 6 is also provided on the inner wall of the receiver 2. A second protective box 18 is assembled on the receiver 2 through the sealing groove 6. The second protective box 18 provides a sealing protection for the receiver 2. The second protective box 18 has a protrusion 19 facing the receiver 2. The protrusion 19 forms an extended channel to prevent debris from entering the receiver 2. The second protective box 18 has a beveled hole 20 away from the receiver 2. The beveled surface of the beveled hole 20 faces outward to reduce the retention of debris.

[0043] At least three sets of corresponding protruding holes 19 and beveled holes 20 are provided, at the same height as the laser receiving point. Adhesive rings 21 are bonded to the inner walls of both the protruding holes 19 and beveled holes 20. Three protective mirrors 22 are rotatably mounted inside the second protective box 18 via a rotating shaft. The protective mirrors 22 are offset relative to the beveled holes 20, with their outer rings sandwiched between the inner and outer adhesive rings 21. The protective mirrors 22 can rotate, allowing the adhesive rings 21 to scrape away any debris adhering to them. Simultaneously, the connection between the protective mirrors 22 and the adhesive rings 21 provides a sealing effect, preventing debris from entering the second protective box 18 and the receiving base 2.

[0044] Each protective mirror 22 has a pulley 23 mounted on its rotating shaft. The pulley 23 is synchronously connected to the belt 24, which connects the rotating shaft of one of the protective mirrors 22 to the motor, driving all the protective mirrors 22 to rotate synchronously. This achieves the effect of continuously switching the usage position. Combined with the cleaning effect of the rubber ring 21, it ensures that the laser can pass smoothly through the protective mirror 22 and be received by the wide-face mirror 17 and the receiving module 16, thus avoiding false alarms.

[0045] Covers 26 are provided on the surfaces of the first protective box 7 and the second protective box 18 facing each other. The covers 26 open automatically when the material door on the engraving machine is opened. The electrical control system in the dental prosthesis engraving machine will only power on the laser emitter and laser receiver when it detects that the material door is open. At this time, the covers 26 also open, and the laser emitter and laser receiver enter the normal working state. When the material door is not open and there is no risk of foreign objects entering, the debris is isolated by the covers 26.

[0046] The cover 26 is mounted on the side seat 25 of the first protective box 7 and the second protective box 18. The side seat 25 is located on the side wall of the first protective box 7 and the second protective box 18. The cover 26 is rotated by the door hinge on the side, and a gear 27 is provided at the bottom of the door hinge as a component to control the rotation of the cover 26.

[0047] A drive assembly is provided at the bottom of both the first protective box 7 and the second protective box 18. The two drive assemblies are symmetrically arranged and use the opening and closing of the material door on the engraving machine as the control force. The drive assembly includes a limiting rail 28 installed on the bottom surface of the first protective box 7 or the second protective box 18. A slide block 29 is slidably installed in the limiting rail 28, and spring guide rods 30 are provided on both sides of the slide block 29. The spring guide rods 30 are arranged through both sides of the limiting rail 28 and use elastic force to position the slide block 29. An extension rod 31 is fixedly installed on the side of the slide 29. A rack 32 is installed at one end of the extension rod 31, and an end block 33 is installed at the other end. The rack 32 meshes with the gear 27, and the end block 33 is set towards the material door. When the slide 29 is in the initial position under the action of only the spring guide rod 30, the rack 32 limits the gear 27 and the door shaft to keep the cover 26 open, exposing the laser emission and reception points. When the material door is closed, it will act on the end block 33 to push the extension rod 31 inward, which will drive the gear 27 to rotate through the rack 32, so that the cover 26 is closed. Therefore, when the material door is closed, the cover 26 is also closed, and the laser emitter and laser receiver do not work. They only start working when the material door is open.

[0048] In addition, a sealing structure is provided on the first protective box 7 for the first bottom groove 14 and the second bottom groove 15, which is also controlled by the drive component on the first protective box 7. A support component 35 is installed at the bottom of the launcher 1 and the first protective box 7. A bottom cover 36 is movably installed on the support component 35. The support component 35 adopts a base with elastic rubber pads, which can elastically support the bottom cover 36 and seal the first bottom groove 14 and the second bottom groove 15. At the same time, a center seat 37 is provided at the center of the bottom surface of the bottom cover 36, and a triangular part is provided in the middle of the center seat 37. In the drive assembly on the first protective box 7, groove 38, a push rod 34 is also welded and fixed on the slide 29. The push rod 34 is inserted into the triangular groove 38. When the material door is opened, causing the slide 29 to move back to its original position, the push rod 34 moves accordingly and acts on the triangular groove 38, generating a downward pushing force on the center seat 37 and the bottom cover 36. This overcomes the elastic force and causes the bottom cover 36 to open, exposing the first bottom groove 14 and the second bottom groove 15. The airflow can then flow smoothly in the launch seat 1 and the first protective box 7, carrying away debris from the bottom and ensuring the light transmittance of the inner spherical mirror 5 and the outer spherical mirror 10.

[0049] In use, the laser protection device first mounts the laser emitter and receiver on both sides of the dental prosthesis carving machine near the material inlet and outlet via a fixing bracket 3 and screws. When the material door is opened, the material door disengages from the end block 33, the spring guide rod 30 drives the slide 29 to reset, and the rack 32 on the slide 29 drives the gear 27 to rotate, causing the cover 26 to open. At the same time, the push rod 34 on the slide 29 moves and acts on the triangular groove 38 of the bottom cover 36, overcoming the elasticity of the support assembly 35 and causing the bottom cover 36 to open, exposing the first In the bottom groove 14 and the second bottom groove 15, after the engraving machine's electrical control system detects that the material door is open, it powers on the laser emitter and laser receiver. The three laser emission points on the emission module 4 emit lasers radially through the inner spherical mirror 5. The laser passes sequentially through the outer spherical mirror 10, the through hole 8, and the open cover 26 in the first protective box 7, and reaches the receiving side. It then passes through the open cover 26, the angled hole 20, the convex hole 19, and the protective mirror 22 on the second protective box 18, and is finally received by the wide-face mirror 17 on the receiving module 16. During the dental prosthesis carving process, the motor drives the outer spherical lens 10 to rotate within the through hole 8 via the control shaft 9. The scraper 11 continuously cleans the surface of the outer spherical lens 10. Simultaneously, the motor drives all the protective lenses 22 to rotate within the second protective box 18 via the pulley 23 and belt 24. The rubber ring 21 scrapes away debris from the surface of the protective lenses 22. The air inlet pipe 13 is connected to an external air supply device that introduces high-pressure airflow into the launcher 1 and the first protective box 7, blowing the fine debris adhering to the inner spherical lens 5 and the outer spherical lens 10 from the bottom first groove 14 and second groove 15. When a foreign object enters the engraving machine and blocks the laser, the laser receiver interrupts reception, sends the result back to the engraving machine to cause it to stop urgently and issue an alarm. When the material door is closed, the material door push block 33 pushes the extension rod 31 inward, the rack 32 drives the gear 27 to rotate and close the cover 26. At the same time, the push rod 34 disengages from the triangular groove 38, and the bottom cover 36 closes the first bottom groove 14 and the second bottom groove 15 under the elastic force of the support component 35. The electrical control system cuts off the power to the laser emitter and the laser receiver, completing the entire safety protection process.

[0050] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances. Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laser protection device for dental prosthesis carving, comprising a laser emitter and a laser receiver disposed on both sides of a carving machine, characterized in that: The laser emitter includes an emitter base, an emitter module installed in the emitter base, and a first protective box assembled on the emitter base. The emitter module has at least three laser emission points, and each laser emission point is equipped with a spherical inner mirror. The laser is emitted along the radius of the inner mirror. The first protective box has through holes that correspond one-to-one with the inner spherical mirror. A control shaft is rotatably installed inside the first protective box. A spherical outer spherical mirror is installed on the control shaft and located inside the through hole. A scraper that is in close contact with the outer wall of the outer spherical mirror is adhered to the inner wall of the through hole. A motor that drives the control shaft to rotate is installed at the top of the first protective box. The laser receiver includes a receiver base, a receiver module installed in the receiver base, and a second protective box mounted on the receiver base. The receiver module has at least three laser receiving points, and each laser receiving point is equipped with a wide-face mirror. The launcher and the top of the first protective box are equipped with an air inlet pipe for connecting an external air supply device to introduce high-pressure airflow. The launcher has a first bottom groove at the bottom, and the first protective box has a second bottom groove at the bottom.

2. The laser protection device for dental prosthesis carving according to claim 1, characterized in that: Two scrapers are bonded to the inner wall of the through hole. Both scrapers are circular ring structures and are located on the front and rear sides of the outer spherical mirror, respectively. The outer wall of the outer sphere is in close contact with the scraper, which continuously cleans the surface of the outer sphere as it rotates.

3. The laser protection device for dental prosthesis carving according to claim 1, characterized in that: The air intake pipe has a multi-channel structure, which is connected to the interior of the launcher and the first protective box respectively. The first bottom groove at the bottom of the launcher and the second bottom groove at the bottom of the first protective box form an ash discharge channel for high-pressure airflow to carry debris out.

4. The laser protection device for dental prosthesis carving according to claim 1, characterized in that: The second protective box has a protruding hole on the side facing the receiver base, and a slanted hole on the side away from the receiver base. The protruding hole and the slanted hole correspond one-to-one and are at the same height as the laser receiving point. Rubber rings are glued to the inner walls of both the convex and beveled holes. A protective mirror located between the convex and beveled holes is installed in the second protective box via a rotating shaft. The outer ring of the protective mirror is clamped between the two rubber rings.

5. A laser protection device for dental prosthesis carving according to claim 4, characterized in that: Each protective goggle is equipped with a pulley on its rotating shaft. All pulleys are connected synchronously via a belt. One of the protective goggles' rotating shafts is connected to a motor. The motor drives all the protective goggles to rotate synchronously via the pulleys and belt, causing the protective goggles to continuously switch their light-transmitting positions under the scraping of the rubber rings.

6. A laser protection device for dental prosthesis carving according to claim 1, characterized in that: Both the first protective box and the second protective box have protective covers on their opposing surfaces. The protective covers are mounted on the side walls of the first or second protective box via side seats. The side of the protective cover has a door hinge, and a gear is installed at the bottom of the door hinge. The protective cover rotates around the door hinge to open or close.

7. A laser protection device for dental prosthesis carving according to claim 6, characterized in that: The bottom of both the first protective box and the second protective box is provided with a drive assembly. The drive assembly includes a limiting rail, a slide block slidably installed in the limiting rail, spring guide rods passing through both sides of the slide block, and an extension rod fixed to the side of the slide block. One end of the extension rod is equipped with a rack that meshes with the gear, and the other end of the extension rod is equipped with an end block facing the material door. The spring guide rod uses its elasticity to reset the slide when the material door is opened, driving the rack to keep the cover open. When the material door is closed, the end block is pushed to push the extension rod inward, and the rack drives the gear to rotate and close the cover.

8. A laser protection device for dental prosthesis carving according to claim 7, characterized in that: The bottom of the launch pad and the first protective box are equipped with a support assembly. A bottom cover for sealing the first bottom groove and the second bottom groove is movably installed on the support assembly. The support assembly has an elastic rubber pad to elastically support the bottom cover. A center seat is provided at the center of the bottom surface of the bottom cover, and a triangular groove is provided in the middle of the center seat. A push rod is also fixed on the slide of the first protective box. The push rod is inserted into the triangular groove. When the slide moves to reset, the push rod pushes the bottom cover to open against the elastic force through the triangular groove. When the slide is pushed inward, the push rod disengages from the triangular groove, and the bottom cover closes the bottom groove under the action of the elastic force.

9. A laser protection device for dental prosthesis carving according to claim 1, characterized in that: The electrical control system of the dental prosthesis carving machine is electrically connected to the laser emitter and laser receiver. When the material door is detected to be open, the electrical control system powers on the laser emitter and laser receiver to make them work, and cuts off the power when the material door is closed. At the same time, the protective cover opens or closes in conjunction with the material door.

10. A laser protection device for dental prosthesis carving according to claim 1, characterized in that: The upper and lower ends of the transmitter and receiver are both welded and fixed with mounting brackets. The transmitter and receiver are fixed to the two sides of the engraving machine near the material inlet and outlet by the mounting brackets and screws.

Images