An artificial tooth metal laser 3D printing device

Abstract

The present invention discloses a dental metal laser 3D printing device, which includes a mounting base plate. The lower surface of the mounting base plate is fixedly connected with support legs, and the surface of the support legs is fixedly connected with a lapping plate. The upper surface of the lapping plate is respectively fixedly connected with a first electric telescopic rod and a first collection box. The upper surface of the first collection box is fixedly connected with a conduit. The upper surface of the mounting base plate is respectively fixedly connected with an air pump, a second collection box, a working box and a printing controller. The inner wall of the working box is fixedly connected with a first electric slide rail, and a first slider is arranged on the side of the first electric slide rail. For this dental metal laser 3D printing device, by setting a third electric slide rail, a third slider and a sweeping plate, it is convenient to push the raw material powder to the dust removal port and fall into the first collection box. By setting an air pump and a dust suction cylinder, it is convenient to suck the raw material powder into the second collection box, so that the device has the function of facilitating the collection of the raw material powder.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and particularly to a dental metal laser 3D printing device. Background Art

[0002] 3D printing is usually achieved by using a digital technology material printer, and this technology has applications in jewelry, footwear, industrial design, architecture, engineering and construction, automotive, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms, and other fields.

[0003] In the dental field, 3D printing technology is used for printing dentures. In existing 3D printing devices, after the denture printing is completed, there will be a large amount of raw material powder in the device, and these raw material powders need to be manually cleaned by technicians, which is rather inconvenient. Therefore, we propose a dental metal laser 3D printing device. Summary of the Invention

[0004] The purpose of the present invention is to provide a dental metal laser 3D printing device to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A dental metal laser 3D printing device includes a mounting base plate. The lower surface of the mounting base plate is fixedly connected with support legs. The surface of the support legs is fixedly connected with a lapping plate. The upper surface of the lapping plate is respectively fixedly connected with a first electric telescopic rod and a first collection box. The upper surface of the first collection box is fixedly connected with a conduit. The upper surface of the mounting base plate is respectively fixedly connected with an air pump, a second collection box, a working box, and a printing controller. The inner wall of the working box is fixedly connected with a first electric slide rail. A first slider is arranged on the side of the first electric slide rail. The side of the first slider is fixedly connected with a slide plate. The lower surface of the slide plate is fixedly connected with a second electric slide rail. A second slider is arranged on the lower surface of the second electric slide rail. The lower surface of the second slider is fixedly connected with a second electric telescopic rod. The telescopic end of the second electric telescopic rod is fixedly connected with a laser generator. The inner rear wall of the working box is fixedly connected with a third electric slide rail. A third slider is arranged on the front of the third electric slide rail. The lower surface of the third slider is fixedly connected with a sweeping plate. The side of the third slider is fixedly connected with a dust suction cylinder. The top end of the dust suction cylinder is fixedly connected with a spring tube. The side of the working box is fixedly connected with a dust conveying pipe. The inner bottom wall of the working box is slidably connected with a first top plate. The output end and the input end of the air pump are both fixedly connected with air conveying pipes.

[0006] Preferably, the number of the support legs is four, and the four support legs are arranged in a rectangular array at the four corners of the lower surface of the mounting base plate.

[0007] Preferably, the first electric slide rail, the second electric slide rail, the second electric telescopic rod, and the laser generator are all electrically connected to the printing controller.

[0008] Preferably, sliding ports and dust removal ports are respectively formed in the inner bottom wall of the working box. The side surface of the first top plate abuts against the inner wall of the sliding port. Through ports adapted to the sliding port and the dust removal port are respectively formed in the upper surface of the mounting bottom plate. The telescopic end of the first electric telescopic rod is fixedly connected to the lower surface of the first top plate. The top end of the conduit is fixedly connected to the lower surface of the mounting bottom plate.

[0009] Preferably, one end of the spring tube far from the dust suction cylinder is fixedly connected to one end of the dust conveying pipe. The other end of the dust conveying pipe is fixedly connected to the side surface of the second collection box. The end of the air conveying pipe far from the air pump is fixedly connected to the back surface of the second collection box. A filter screen is fixedly connected to the inner wall of the air conveying pipe.

[0010] Preferably, movable doors are respectively rotatably connected to the fronts of the working box, the first collection box, and the second collection box by hinges. The lower surface of the sweeping plate is slidably connected to the inner bottom wall of the working box.

[0011] Preferably, the second collection box includes: a housing, a second top plate, and a discharge port. The second top plate is arranged at the top end of the housing. A feed port is arranged on the upper side wall of the housing. An air suction port is arranged on the second top plate. A first filter is arranged above the feed port in the housing. A first circular tube extending downward is arranged at the center of the first filter. A filter screen is arranged at the bottom of the first filter. The filter screen is located outside the first circular tube. A dust raising baffle is arranged at the bottom of the filter screen. A second filter is arranged on the inner wall of the housing and is located below the first filter. The second filter is in a conical shape with a larger upper part and a smaller lower part, and a plurality of through holes are arranged on the side wall. A second circular tube is arranged below the second filter. The lower end of the second circular tube is hermetically connected to the discharge port. The inner wall of the second circular tube and the discharge port form a coarse filtration chamber. The outer wall of the second circular tube, the inner wall of the housing, and the discharge port form a fine filtration chamber. The dust conveying pipe is connected to the feed port. The air suction port is connected to the air conveying pipe.

[0012] Preferably, an anti-backflow device is provided in the air delivery pipe. The anti-backflow device includes an anti-backflow housing and a first air passage. The anti-backflow housing is cylindrical and inserted into the air delivery pipe. The first air passage is provided inside the anti-backflow housing. A second air passage is provided at the lower end of the anti-backflow housing. The upper end of the second air passage is connected to the lower end of the anti-backflow housing. A cushion plate is provided at the upper end of the second air passage. The cushion plate is annular and the lower surface of its outer edge is disposed on the anti-backflow housing. A cover plate is provided on the upper surface of the cushion plate. The cover plate is connected to a rotating shaft through a first support rod. The rotating shaft is disposed on the inner wall of the anti-backflow housing. The lower surface of the cover plate is connected to the upper surface of the cushion plate through a restoring part. An annular external connector is provided at the upper end of the anti-backflow housing. An annular boss is provided on the lower surface of the cushion plate. The outer side surface of the boss is in contact with the inner wall of the second air passage.

[0013] Preferably, the restoring part is provided with a spring. The right end of the spring is connected to the center of the lower surface of the cover plate. The left end of the spring is connected to the inner wall of the second air passage through a second support rod. The restoring part is further provided with two rotating springs. The rotating springs are disposed on the rotating shaft. The two ends of each rotating spring respectively abut against the first support rod and the anti-backflow housing.

[0014] Preferably, a sealing ring is provided between the cushion plate and the cover plate. The rotating shaft is disposed on the inner side wall of the anti-backflow housing. A second sealing ring is provided inside the external connector. The external connector and the anti-backflow housing are made of plastic.

[0015] Advantageous Effects

[0016] The present invention provides a dental metal laser 3D printing device, which has the following advantageous effects:

[0017] 1. For this dental metal laser 3D printing device, by providing a third electric slide rail, a third slider and a sweeping plate, it is convenient to push the raw material powder to the dust removal port and let it fall into the first collection box. By providing an air pump and a dust suction cylinder, it is convenient to suck the raw material powder into the second collection box, so that the device has the function of facilitating the collection of the raw material powder.

[0018] 2. For this dental metal laser 3D printing device, by providing a first electric telescopic rod, it is convenient to push the first top plate. By providing a first electric slide rail, a first slider, a second electric slide rail, a second slider, a second electric telescopic rod, a laser generator and a printing controller, it is convenient for the device to perform dental printing, so that the device achieves the effect of being easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic front sectional structure diagram of the present invention;

[0020] Figure 2 Schematic front view structure of the present invention;

[0021] Figure 3 Schematic top view structure of the present invention;

[0022] Figure 4 of the present invention Figure 1 Schematic enlarged structure of location A in the present invention;

[0023] Figure 5 Internal structure of the second collection box in the present invention in the closed state;

[0024] Figure 6 Schematic structure of the second filter in the second collection box of the present invention;

[0025] Figure 7 Internal structure of the second collection box in the present invention in the open state;

[0026] Figure 8 Schematic rear view structure of the anti-backflow device in the present invention;

[0027] Figure 9 Schematic structure of the anti-backflow device in the present invention in the closed state;

[0028] Figure 10 Internal structure of the anti-backflow device in the present invention in the open state;

[0029] In the figure: 1 mounting base plate, 2 support legs, 3 overlapping plate, 4 first electric telescopic rod, 5 first collection box, 6 conduit, 7 air pump, 8 second collection box, 81 feed inlet, 811 suction port, 812 second top plate, 813 first filter, 814 first circular tube, 82 outer shell, 83 second filter, 831 through hole, 84 second circular tube, 85 fine filtration chamber, 86 discharge port, 87 coarse filtration chamber, 88 filter screen, 89 dust-proof baffle, 9 working box, 10 printing controller, 11 first electric slide rail, 12 first slider, 13 sliding plate, 14 second electric slide rail, 15 second slider, 16 second electric telescopic rod, 17 laser generator, 18 third electric slide rail, 19 third slider, 20 sweeping plate, 21 dust suction cylinder, 22 spring tube, 23 dust conveying pipe, 24 first top plate, 25 air conveying pipe, 251 anti-backflow outer shell, 252 first air passage, 253 second air passage, 254 cushion plate, 255 cover plate, 256 first support rod, 257 rotating shaft, 258 spring, 259 second support rod, 2510 rotating spring, 2511 external connection part, 2512 sealing ring, 2513 convex platform, 2514 second sealing ring. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 1-10 , the present invention provides a technical solution: a dental metal laser 3D printing device, including a mounting base plate 1. A support leg 2 is fixedly connected to the lower surface of the mounting base plate 1. The number of support legs 2 is four, and the four support legs 2 are arranged in a rectangular array at the four corners of the lower surface of the mounting base plate 1. A lap plate 3 is fixedly connected to the surface of the support leg 2. A first electric telescopic rod 4 and a first collection box 5 are respectively fixedly connected to the upper surface of the lap plate 3. A conduit 6 is fixedly connected to the upper surface of the first collection box 5, and the top end of the conduit 6 is fixedly connected to the lower surface of the mounting base plate 1. An air pump 7, a second collection box 8, a working box 9 and a printing controller 10 are respectively fixedly connected to the upper surface of the mounting base plate 1. Activity doors are rotatably connected to the fronts of the working box 9, the first collection box 5 and the second collection box 8 through hinges.

[0032] A first electric slide rail 11 is fixedly connected to the inner wall of the working box 9. A first slider 12 is arranged on the side of the first electric slide rail 11. A slide plate 13 is fixedly connected to the side of the first slider 12. A second electric slide rail 14 is fixedly connected to the lower surface of the slide plate 13. A second slider 15 is arranged on the lower surface of the second electric slide rail 14. A second electric telescopic rod 16 is fixedly connected to the lower surface of the second slider 15. A laser generator 17 is fixedly connected to the telescopic end of the second electric telescopic rod 16.

[0033] The first electric slide rail 11, the second electric slide rail 14, the second electric telescopic rod 16 and the laser generator 17 are all electrically connected to the printing controller 10. Control elements of the first electric slide rail 11, the second electric slide rail 14, the second electric telescopic rod 16 and the laser generator 17 are respectively arranged inside the printing controller 10, and a control panel is arranged on the front of the printing controller 10. By setting the first electric slide rail 11, the first slider 12, the second electric slide rail 14, the second slider 15, the second electric telescopic rod 16, the laser generator 17 and the printing controller 10, it is convenient for the device to print dentures, so that the device achieves the effect of being easy to use.

[0034] The inner rear wall of the working box 9 is fixedly connected with a third electric slide rail 18. A third slider 19 is arranged on the front surface of the third electric slide rail 18. The lower surface of the third slider 19 is fixedly connected with a sweeping plate 20. The lower surface of the sweeping plate 20 is slidably connected with the inner bottom wall of the working box 9. The side surface of the third slider 19 is fixedly connected with a dust suction cylinder 21. The top end of the dust suction cylinder 21 is fixedly connected with a spring tube 22. The side surface of the working box 9 is fixedly connected with a dust conveying pipe 23. One end of the spring tube 22 far from the dust suction cylinder 21 is fixedly connected with one end of the dust conveying pipe 23. The other end of the dust conveying pipe 23 is fixedly connected with the side surface of the second collection box 8. The inner bottom wall of the working box 9 is slidably connected with a first top plate 24. The inner bottom wall of the working box 9 is respectively provided with a sliding opening and a dust removal opening. By arranging the third electric slide rail 18, the third slider 19 and the sweeping plate 20, it is convenient to push the raw material powder to the dust removal opening and fall into the first collection box 5.

[0035] The side surface of the first top plate 24 is lapped with the inner wall of the sliding opening. The upper surface of the installation bottom plate 1 is respectively provided with through openings adapted to the sliding opening and the dust removal opening. The telescopic end of the first electric telescopic rod 4 is fixedly connected with the lower surface of the first top plate 24. By arranging the first electric telescopic rod 4, it is convenient to push the first top plate 24. Both the output end and the input end of the air pump 7 are fixedly connected with an air conveying pipe 25. One end of the air conveying pipe 25 far from the air pump 7 is fixedly connected with the back surface of the second collection box 8. A filter screen is fixedly connected to the inner wall of the air conveying pipe 25. By arranging the air pump 7 and the dust suction cylinder 21, it is convenient to suck the raw material powder into the second collection box 8, so that the device has the function of being convenient for collecting the raw material powder.

[0036] Working principle: When using this dental metal laser 3D printing device, first place the raw material powder on the first top plate 24, then start the third electric slide rail 18. The third slider 19 drives the sweeping plate 20 to level the raw material powder, and pushes the excess raw material powder into the first collection box 5 through the dust removal opening. After that, start the device, upload the printing template to the printing controller 10. The printing controller 10 controls the first electric slide rail 11, the second electric slide rail 14, the second electric telescopic rod 16 and the laser generator 17 to perform laser printing on the raw material powder according to the printing template. After the printing is completed, start the first electric telescopic rod 4 to lift the printed denture. Then start the third electric slide rail 18 and the air pump 7 to suck the raw material powder on the surface of the denture into the second collection box 8. Finally, take out the denture. By using this 3D printing device, the device has the function of being convenient for collecting the raw material powder.

[0037] In one embodiment, the second collection box 8 includes: a housing 82, a second top plate 812, and a discharge port 86. The second top plate 812 is disposed at the top of the housing 82. An inlet port 81 is provided on the upper side wall of the housing 82. An air suction port 811 is provided on the second top plate 812. A first filter 813 is provided in the housing 82 above the inlet port 81. A first circular tube 814 extending downward is provided at the center of the first filter 813. A filter screen 88 is provided at the bottom of the first filter 813. The filter screen 88 is located outside the first circular tube 814. A dust-raising baffle 89 is provided at the bottom of the filter screen 88. A second filter 83 is provided on the inner wall of the housing 82 and is located below the first filter 813. The second filter 83 is a cone with a larger upper part and a smaller lower part, and a plurality of through holes 831 are provided on the side wall. A second circular tube 84 is provided below the second filter 83. The lower end of the second circular tube 84 is hermetically connected to the discharge port 86. The inner wall of the second circular tube 84 and the discharge port 86 form a coarse filtration chamber 87. The outer wall of the second circular tube 84, the inner wall of the housing 82, and the discharge port 86 form a fine filtration chamber 85. The dust conveying pipe 23 is connected to the inlet port 81, and the air suction port 811 is connected to the air conveying pipe 25.

[0038] The working principle of the above technical solution: The powder initially filtered by the dust conveying pipe 23 enters the interior of the housing 82 through the inlet port 81. Since the second collection box 8 is cylindrical, the air entering from the inlet port 81 will flow rotationally in the housing 82. While rotating, under the action of centrifugal force, the powder with larger particles will settle under the action of gravity at the rotation center in the coarse filtration chamber 87 surrounded by the second circular tube 84, while the powder with smaller particles and lighter weight will be thrown to the inner wall of the housing 82 and deposited and fall onto the second filter 83. After being filtered by the second filter 83, it settles into the fine filtration chamber 85. There will still be a small part of the powder driven by the wind to become dust. Most of the dust will be blocked by the dust-raising baffle 89, and some of the dust will bypass the dust-raising baffle 89 and be filtered by the filter screen 88. In order to prevent the filter screen 88 from being sucked into the interior by the air suction port 811, the first circular tube 814 is specifically provided for support. The filtered air will be pumped from the air suction port 811 to the air conveying pipe 25. When the powder in the working box 9 is completely absorbed, after closing the air pump 7 and waiting for the powder in the second collection box 8 to settle, the discharge port 86 can be opened to recover the settled powder, and at the same time, the second top plate 812 can be opened to clean the first filter 813.

[0039] Beneficial effects of the above technical solution: Through the design of the above structure, dust collection in the working box 9 can be achieved. After the dust is initially filtered by the dust conveying pipe 23, gas and dust are separated again by the action of centrifugal force, preventing the dust from being sucked into the air pump 7 during separation and causing damage to the air pump 7. Moreover, the entire second collection box 8 adopts a detachable structure design for both the upper and lower parts, which facilitates the recovery of the filtered powder and daily cleaning and maintenance.

[0040] In one embodiment, an anti-backflow device is provided in the air conveying pipe 25. The anti-backflow device is provided with an anti-backflow outer shell 251 and a first air passage 252. The anti-backflow outer shell 251 is cylindrical and inserted into the air conveying pipe 25. The anti-backflow outer shell 251 is cylindrical. The first air passage 252 is arranged inside the anti-backflow outer shell 251. A second air passage 253 is provided at the lower end of the anti-backflow outer shell 251. The upper end of the second air passage 253 is connected to the lower end of the anti-backflow outer shell 251. A backing plate 254 is provided at the upper end of the second air passage 253. The backing plate 254 is annular and its outer edge is arranged on the anti-backflow outer shell 251. A cover plate 255 is provided on the upper surface of the backing plate 254. The cover plate 255 is connected to a rotating shaft 257 through a first support rod 256. The rotating shaft 257 is arranged on the inner wall of the anti-backflow outer shell 251. The lower surface of the cover plate 255 is connected to the upper surface of the backing plate 254 through a restoring part. An annular external connecting part 2511 is provided at the upper end of the anti-backflow outer shell 251. An annular boss 2513 is provided on the lower surface of the backing plate 254. The outer side surface of the boss 2513 is in contact with the inner wall of the second air passage 253.

[0041] Working principle of the above technical solution: When recovering the powder after printing is completed, in order to prevent the fan from blowing the collected powder back into the working box 9 by reverse air supply, an anti-backflow device needs to be installed. When sucking air, the air flow flows from the second air passage 253 to the first air passage 252, and at the same time, the cover plate 255 is sucked up. When the air suction stops or reverse air supply occurs, the restoring part twists the cover plate 255 while the rotating shaft 257 drives the first support rod 256 to make the cover plate 255 return to its position and be hermetically connected to the backing plate 254. The boss 2513 on the lower surface of the backing plate 254 can play a role in limiting and fixing to prevent the backing plate 254 from shifting. At the same time, the external connecting part 2511 can be inserted into the inside of the air conveying pipe 25 to complete the installation of the anti-backflow device and facilitate future disassembly and maintenance.

[0042] Beneficial effects of the above technical solution: When the air pump 7 starts normally, it will suck air and lift the cover plate 255. At this time, the anti-backflow device is in an open state. When the air pump 7 stops abnormally or rotates in reverse, the cover plate 255 will be driven back to its original position by the restoring part and the rotating shaft 257, thereby blocking the air conveying pipe 25 and preventing the air flow from flowing back and blowing the collected powder back into the working box 9.

[0043] In one embodiment, a spring 258 is provided in the restoring part. The right end of the spring 258 is connected to the center of the lower surface of the cover plate 255. The left end of the spring 258 is connected to the inner wall of the second air duct 253 through a second support rod 259. Two rotating springs 2510 are also provided in the restoring part. The rotating springs 2510 are arranged on the rotating shaft 257. The two ends of the rotating springs 2510 respectively abut against the first support rod 256 and the anti-backflow housing 251.

[0044] Working principle of the above technical solution: The restoring part connects the spring 258 with the second air duct 253 through the second support rod 259. When the anti-backflow device is in the open state, the spring 258 is in a stretched state. At the same time, the rotating spring 2510 on the rotating shaft 257 abuts against one end of the anti-backflow housing 251 to keep it stationary, and the other end abutting against the first support rod 256 is driven by the rotating shaft 257 to rotate and the rotating spring 2510 is in a state of being screwed and compressed. When the air pump 7 stops working, the spring 258 will retract, and at the same time, the rotating spring 2510 will rotate back to its original position to close the cover plate 255 and make it in a sealed state to prevent air flow from flowing back.

[0045] Beneficial effects of the above technical solution: Through the design of the above structure, the cover plate 255 can be closed instantly to prevent backflow by the dual action of the spring 258 and the rotating spring 2510 when the air flow in the air duct 25 is interrupted or changed. At the same time, the air flow velocity when the anti-backflow device is open can be adjusted by adjusting the tightness of the rotating spring 2510 and the spring 258.

[0046] In one embodiment, a sealing ring 2512 is provided between the backing plate 254 and the cover plate 255. The rotating shaft 257 is arranged on the inner side wall of the anti-backflow housing 251. A second sealing ring 2514 is provided inside the external member 2511. The external member 2511 and the anti-backflow housing 251 are made of plastic.

[0047] Working principle of the above technical solution: A rubber sealing ring 2512 is provided between the backing plate 254 and the cover plate 255, which can reduce the impact on the backing plate 254 when the cover plate 255 is closed to play a shock-absorbing role and can also play a sealing role. The rotating shaft 257 arranged on the anti-backflow housing 251 enables the cover plate 255 to rotate around the rotating shaft 257. The second sealing ring 2514 can play a sealing role between the air duct 25 and the external member 2511 to increase the sealing performance of the first air duct 252. The whole anti-backflow device is made of plastic, which can reduce costs and is convenient for replacement.

[0048] Advantages of the above technical solution: Through the design of the above structure, the sealing ring 2512 increases the sealing performance between the backing plate 254 and the cover plate 255, and also enhances the shock absorption effect. The second sealing ring 2514 provides support for the good sealing performance of the first air passage 252. At the same time, the anti-backflow device made of plastic material is convenient for replacement.

[0049] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dental prosthetic metal laser 3D printing device, comprising a mounting base plate (1), characterized in that: The lower surface of the mounting base plate (1) is fixedly connected with support legs (2), the surface of the support legs (2) is fixedly connected with overlapping plates (3), the upper surface of the overlapping plates (3) is respectively fixedly connected with a first electric telescopic rod (4) and a first collection box (5), the upper surface of the first collection box (5) is fixedly connected with a conduit (6), the upper surface of the mounting base plate (1) is respectively fixedly connected with an air pump (7), a second collection box (8), a working box (9) and a printing controller (10), the inner wall of the working box (9) is fixedly connected with a first electric slide rail (11), a first slider (12) is arranged on the side of the first electric slide rail (11), the side of the first slider (12) is fixedly connected with a slide plate (13), the lower surface of the slide plate (13) is fixedly connected with a second electric slide rail (14), a second slider (15) is arranged on the lower surface of the second electric slide rail (14), the lower surface of the second slider (15) is fixedly connected with a second electric telescopic rod (16), and the telescopic end of the second electric telescopic rod (16) is fixedly connected with a laser generator (17); The number of the support legs (2) is four, and the four support legs (2) are arranged in a rectangular array at the four corners of the lower surface of the mounting base plate (1); The inner rear wall of the working box (9) is fixedly connected with a third electric slide rail (18), a third slider (19) is arranged on the front of the third electric slide rail (18), the lower surface of the third slider (19) is fixedly connected with a sweeping plate (20), the side of the third slider (19) is fixedly connected with a dust suction cylinder (21), the top end of the dust suction cylinder (21) is fixedly connected with a spring tube (22), the side of the working box (9) is fixedly connected with a dust conveying pipe (23), the inner bottom wall of the working box (9) is slidably connected with a first top plate (24), and the output end and the input end of the air pump (7) are both fixedly connected with an air conveying pipe (25); An anti-backflow device is provided in the air delivery pipe (25). The anti-backflow device is provided with an anti-backflow housing (251) and a first air passage (252). The anti-backflow housing (251) is cylindrical and inserted into the air delivery pipe (25). The first air passage (252) is arranged in the anti-backflow housing (251). A second air passage (253) is provided at the lower end of the anti-backflow housing (251). The upper end of the second air passage (253) is connected to the lower end of the anti-backflow housing (251). A backing plate (254) is provided at the upper end of the second air passage (253). The backing plate (254) is annular and the lower surface of the outer edge is arranged on the anti-backflow housing (251). A cover plate (255) is provided on the upper surface of the backing plate (254). The cover plate (255) is connected to a rotating shaft (257) through a first support rod (256). The rotating shaft (257) is arranged on the inner wall of the anti-backflow housing (251). The lower surface of the cover plate (255) is connected to the upper surface of the backing plate (254) through a restoring part. An annular external connection part (2511) is provided at the upper end of the anti-backflow housing (251). An annular boss (2513) is provided on the lower surface of the backing plate (254). The outer side surface of the boss (2513) is attached to the inner wall of the second air passage (253). The restoring part is provided with a spring (258). The right end of the spring (258) is connected to the center of the lower surface of the cover plate (255). The left end of the spring (258) is connected to the inner wall of the second air passage (253) through a second support rod (259). The restoring part is also provided with two rotating springs (2510). The rotating springs (2510) are arranged on the rotating shaft (257). The two ends of the rotating spring (2510) respectively abut against the first support rod (256) and the anti-backflow housing (251). A sealing ring (2512) is provided between the backing plate (254) and the cover plate (255). The rotating shaft (257) is arranged on the inner side wall of the anti-backflow housing (251). A second sealing ring (2514) is provided inside the external connection part (2511). The external connection part (2511) and the anti-backflow housing (251) are made of plastic.

2. The dental prosthetic metal laser 3D printing device according to claim 1, characterized in that: The first electric slide rail (11), the second electric slide rail (14), the second electric telescopic rod (16) and the laser generator (17) are all electrically connected to the printing controller (10).

3. A dental prosthetic metal laser 3D printing device according to claim 1, characterized in that: Sliding openings and dust removal openings are respectively formed on the inner bottom wall of the working box (9). The side surface of the first top plate (24) abuts against the inner wall of the sliding opening. Through openings adapted to the sliding opening and the dust removal opening are respectively formed on the upper surface of the mounting bottom plate (1). The telescopic end of the first electric telescopic rod (4) is fixedly connected to the lower surface of the first top plate (24). The top end of the conduit (6) is fixedly connected to the lower surface of the mounting bottom plate (1).

4. The dental prosthetic metal laser 3D printing device according to claim 1, characterized in that: One end of the bourdon tube (22) away from the dust suction cylinder (21) is fixedly connected to one end of the dust conveying pipe (23), the other end of the dust conveying pipe (23) is fixedly connected to the side surface of the second collection box (8), one end of the air conveying pipe (25) away from the air pump (7) is fixedly connected to the back surface of the second collection box (8), and a filter screen is fixedly connected to the inner wall of the air conveying pipe (25).

5. A dental prosthetic metal laser 3D printing device according to claim 1, characterized in that: Activity doors are rotatably connected to the front surfaces of the working box (9), the first collection box (5) and the second collection box (8) through hinges, and the lower surface of the sweeping plate (20) is slidably connected to the inner bottom wall of the working box (9).

6. The denture metal laser 3D printing device according to claim 1, characterized in that: The second collection box (8) includes: a housing (82), a second top plate (812) and a discharge port (86). The second top plate (812) is arranged at the top of the housing (82). A feed port (81) is arranged on the upper side wall of the housing (82). An air suction port (811) is arranged on the second top plate (812). A first filter (813) is arranged above the feed port (81) in the housing (82). A first circular tube (814) extending downward is arranged at the center of the first filter (813). A filter screen (88) is arranged at the bottom of the first filter (813). The filter screen (88) is located outside the first circular tube (814). A dust-raising baffle (89) is arranged at the bottom of the filter screen (88). A second filter (83) is arranged on the inner wall of the housing (82) and below the first filter (813). The second filter (83) is a cone with a larger upper part and a smaller lower part, and a plurality of through holes (831) are arranged on the side wall. A second circular tube (84) is arranged below the second filter (83). The lower end of the second circular tube (84) is hermetically connected to the discharge port (86). The inner wall of the second circular tube (84) and the discharge port (86) form a coarse filtration chamber (87). The outer wall of the second circular tube (84), the inner wall of the housing (82) and the discharge port (86) form a fine filtration chamber (85). The dust conveying pipe (23) is connected to the feed port (81), and the air suction port (811) is connected to the air conveying pipe (25).

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