A stereolithography 3D printer

Abstract

The present invention relates to the field of 3D printing equipment, and specifically relates to a stereolithography 3D printer; it includes a box body, a projector, a light-transmitting groove, tempered glass, a liquid tank, a sliding seat, a lead screw, a motor, a support arm, a rotating unit, a forming platform plate, a squeegee, and a light-shielding cover; an annular pipe groove is formed on the outer wall of the liquid tank, a heat dissipation pipe is fixedly connected in the annular pipe groove, a through groove is formed between the annular pipe groove and the liquid tank, the through groove is fixedly and hermetically connected with a heat conduction block, the heat conduction block is in contact with the heat dissipation pipe, an L-shaped groove is formed on the upper surface of the box body, one end of a leather tube is fixedly connected to the left notch of the L-shaped groove, the other end of the leather tube is fixedly connected to the lower notch of the annular pipe groove, and an exhaust fan is fixedly connected to the right notch of the L-shaped groove. By connecting the annular pipe groove and the L-shaped groove with a leather tube, placing an odor adsorbent in the L-shaped groove and arranging an exhaust fan at the notch, the present invention reduces the discharge of pungent odor in the photosensitive resin and also reduces the temperature in the liquid tank.

Description

Technical Field

[0001] The present invention relates to the field of 3D printing devices, and more specifically to a stereolithography 3D printer. Background Art

[0002] A stereolithography 3D printer irradiates a liquid photocurable resin with ultraviolet light or a light source within a specific wavelength range to initiate a photochemical reaction, causing the photocurable resin in the irradiated area to solidify from a liquid state. After layer-by-layer curing, the object to be formed can be obtained, and it is widely used in industrial product concept design, rapid tooling manufacturing, and medical applications.

[0003] For existing stereolithography 3D printers, first, a certain amount of liquid resin is injected into the liquid tank. The forming platform is coordinated with the cantilever, and the forming platform is horizontally coordinated with the liquid tank. The motor controls the rotation of the lead screw to control the cantilever to drive the forming platform to descend to the upper surface of the pool film, with a distance of one layer from the pool film. The computer is connected to the projector, and the projector projects the object to be printed onto the forming plane through tempered glass. First, a layer is cured on the forming plane. The motor controls the forming platform to rise one layer, and resin is continuously projected for curing. The forming platform rises until the object is completely formed. The bolts are loosened, the connecting piece is removed from the forming platform, and the formed part is scraped off with a scraper to continue forming the next object.

[0004] However, due to the strong pungent smell of photosensitive resin, the printing time of most stereolithography printers is relatively long. Prolonged inhalation can cause harm to the body. Moreover, the photocuring reaction is a polymerization reaction and an exothermic reaction. The heat cannot be dissipated in a short time and accumulates in the resin tank, increasing the temperature in the tank. The high temperature increases the adhesion between the release film and the printed body, reducing the service life of the release film. At the same time, too high a temperature will greatly reduce the service life of relevant electronic components in the printer.

[0005] In view of this, in order to overcome the above technical problems, the present invention designs a stereolithography 3D printer to solve the above technical problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that a stereolithography 3D printer provided by the present invention can solve the problems that the stereolithography printer emits a pungent smell during operation, which affects people's physical health, and the photocuring reaction is exothermic, resulting in a temperature increase.

[0007] A light-curing 3D printer provided by the present invention includes a box body, a projector, a light-transmitting groove, a tempered glass, a liquid tank, a sliding seat, a lead screw, a motor, a support arm, a rotating unit, a forming platform plate, a squeegee and a light-shielding cover; a projector is fixedly installed inside the box body, a light-transmitting groove is opened at the top of the box body, a tempered glass is fixedly installed on the upper surface of the box body, a liquid tank is fixedly installed on the upper surface of the tempered glass, an annular pipe groove is opened on the outer wall of the liquid tank, the upper slot opening of the annular pipe groove is opened on the upper surface of the outer wall of the liquid tank, and the lower slot opening of the annular pipe groove is opened at the lower right end of the outer wall of the liquid tank; a heat dissipation pipe is fixedly connected inside the annular pipe groove, the material of the heat dissipation pipe has good heat dissipation performance, a through groove is opened between the annular pipe groove and the liquid tank, the through groove is fixedly and hermetically connected with a heat conduction block, the heat conduction block is in contact with the heat dissipation pipe, and the material of the heat conduction block has good heat conduction performance; a sliding seat is fixedly installed on one side of the upper surface of the box body, a lead screw is movably sleeved inside the sliding seat, the lead screw passes through the box body and is fixedly connected with a motor, the outer surface of the lead screw is rotationally connected with a support arm, the support arm is slidably connected with the sliding seat, a through groove is opened inside the support arm, a rotating unit is arranged inside the through groove, and the rotating unit is detachably and fixedly connected with the forming platform plate; the forming platform plate is frustum-shaped, a squeegee is fixedly connected at the position of the support arm corresponding to the forming platform plate, the squeegee is in contact with the upper surface of the forming platform plate, an L-shaped groove is opened on the upper surface of the box body, one end of a leather tube is fixedly connected to the left slot opening of the L-shaped groove, the other end of the leather tube is fixedly connected to the lower slot opening of the annular pipe groove, and an exhaust fan is fixedly connected to the right slot opening of the L-shaped groove.

[0008] Preferably, the rotating unit includes a gear, a transmission shaft, a first bevel gear, a second bevel gear and a rotating member, the gear is rotationally connected to the right side of the through groove, the right end of the transmission shaft is fixedly connected with the gear and the left end is fixedly connected with the first bevel gear, the first bevel gear meshes with the second bevel gear, the upper end of the second bevel gear is rotationally connected to the through groove and the lower end is fixedly connected with the rotating member, a rack is arranged on the side wall of the sliding seat, the rack cooperates with the gear, and the rotating member is detachably and fixedly connected with the forming platform plate.

[0009] Preferably, there are multiple squeegees which are evenly arranged on the upper surface of the forming platform plate.

[0010] Preferably, a first groove is provided on the lower surface of the rotating member, a convex block matching the first groove is provided at the upper end of the forming platform plate, a first rectangular through hole is transversely opened and a second rectangular through hole is longitudinally opened at the part of the rotating member matching the convex block, the first rectangular through hole and the second rectangular through hole are arranged in a cross shape, two "concave" blocks are placed inside the first rectangular through hole, the two "concave" blocks are placed opposite to each other and a rectangular hole of the same size as the second rectangular hole is formed in the middle, a limiting block is placed inside the second rectangular hole, second grooves are opened on the upper surfaces at both ends of the limiting block, sliders are slidably connected inside the second grooves, one end of a spring is fixedly connected to the bottom end of the slider, and the other end of the spring is fixedly connected to the bottom of the groove.

[0011] Preferably, a ventilation opening is provided at the bottom of the side surface of the light-shielding cover.

[0012] Preferably, a slope is provided at the edge of the inner wall of the liquid tank, and a direct flow channel is provided on the slope surface.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. In a light-curing 3D printer of the present invention, during the light-curing operation, by connecting the annular pipe groove and the L-shaped groove with a leather tube, placing an odor adsorbent in the L-shaped groove and arranging an exhaust fan at the groove opening, while reducing the emission of pungent odor in the photosensitive resin, the temperature in the liquid tank is also reduced.

[0015] 2. In a light-curing 3D printer of the present invention, by arranging the rotating unit and the forming platform plate to be detachably and fixedly connected and cooperating with the scraper, the liquid resin adhered to the surface of the forming platform plate can be scraped off. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 is the internal structure schematic diagram of the present invention;

[0018] Figure 2 is the front view of the present invention;

[0019] Figure 3 is the cooperation diagram of the rotating unit and the forming platform plate of the present invention;

[0020] Figure 4 is the structural schematic diagram of the limiting block of the present invention;

[0021] Figure 5 It is the internal structure diagram of the limit block of the present invention;

[0022] Figure 6 It is the top view of the forming platform plate of the present invention;

[0023] Figure 7 It is the cooperation diagram of the L-shaped groove and the spiral fan of the present invention.

[0024] In the figure: box body 1, projector 2, light-transmitting groove 3, toughened glass 4, liquid tank 5, annular pipe groove 51, heat dissipation pipe 511, heat conduction block 512, direct flow channel 52, sliding seat 6, rack 61, lead screw 7, motor 8, support arm 9, rotating unit 10, gear 101, transmission shaft 102, first bevel gear 103, second bevel gear 104, rotating part 105, forming platform plate 11, scraping plate 12, light-shielding cover 13, ventilation port 131, L-shaped groove 14, exhaust fan 15, "concave" block 16, limit block 17, groove 171, slider 172, spring 173. Specific embodiments

[0025] In order to make the technical means, creative features, achieved purposes and effects realized by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0026] The present invention provides a light-curing 3D printer, including a box body 1, a projector 2, a light-transmitting groove 3, a toughened glass 4, a liquid tank 5, a sliding seat 6, a lead screw 7, a motor 8, a support arm 9, a rotating unit 10, a forming platform plate 11, a scraping plate 12 and a light-shielding cover 13; the projector 2 is fixedly installed inside the box body 1, a light-transmitting groove 3 is opened at the top of the box body 1, the toughened glass 4 is fixedly installed on the upper surface of the box body 1, the liquid tank 5 is fixedly installed on the upper surface of the toughened glass 4, an annular pipe groove 51 is opened inside the outer wall of the liquid tank 5, the upper slot opening of the annular pipe groove 51 is opened on the upper surface of the outer wall of the liquid tank 5, and the lower slot opening of the annular pipe groove 51 is opened at the lower right end of the outer wall of the liquid tank 5; a heat dissipation pipe 511 is fixedly connected inside the annular pipe groove 51, the material of the heat dissipation pipe 511 has good heat dissipation performance, a through groove is opened between the annular pipe groove 51 and the liquid tank, the through groove is fixedly and hermetically connected with a heat conduction block 512, the heat conduction block 512 is in contact with the heat dissipation pipe 511, and the material of the heat conduction block 512 has good heat conduction performance;

[0027] On one side of the upper surface of the box body 1, a sliding seat 6 is fixedly installed. A lead screw 7 is movably sleeved inside the sliding seat 6. The lead screw 7 passes through the box body 1 and is fixedly connected to a motor 8. A support arm 9 is rotatably connected to the outer surface of the lead screw 7. The support arm 9 is slidably connected to the sliding seat 6. A through groove is provided inside the support arm 9, and a rotating unit 10 is arranged inside the through groove. The rotating unit 10 is detachably and fixedly connected to the forming platform plate 11; a scraper 12 is fixedly connected below the support arm 9. The forming platform plate 11 is frustum-shaped, and the scraper 12 is in contact with the upper surface of the forming platform plate 11; an L-shaped groove 14 is provided on the upper wall of the box body 1. One end of a leather tube is fixedly connected to the left slot opening of the L-shaped groove 14, and the other end of the leather tube is fixedly connected to the lower slot opening of the annular tube groove 51. An exhaust fan 15 is fixedly connected to the right slot opening of the L-shaped groove 14.

[0028] When the stereolithography 3 printer works, a certain amount of resin liquid is injected into the liquid tank 5. An odor adsorbent, such as activated carbon and high-surface-area silicate, is placed in the L-shaped groove 14 provided on the upper wall of the box body 1. The rotating unit 10 inside the support arm 9 is detachably and fixedly connected to the forming platform plate 11, and the light-shielding cover 13 is covered on the upper surface of the box body 1; the motor 8 is started to drive the lead screw 7 to rotate, so that the support arm 9 drives the forming platform plate 11 to move down to a curing distance from the pool film. The computer is connected to the projector 2, and the projector 2 projects an object onto the lower surface of the forming platform plate 11 through the light-transmitting groove 3 and the toughened glass 4, and undergoes a photochemical reaction with the resin liquid to cure. Then the motor 8 works to drive the forming platform plate 11 to move up a curing distance, and the projector 2 projects the resin liquid again for the next layer of photochemical reaction curing. This process is repeated continuously until curing and forming;

[0029] During the curing reaction process, the exhaust fan 15 fixedly connected to the right slot opening of the L-shaped groove 14 is started. The exhaust fan 15 discharges the pungent gas emitted by the resin liquid in the light-shielding cover 13 through the L-shaped groove 14, the leather tube, and the annular tube groove 51 provided on the outer wall of the liquid tank 5. When the pungent gas passes through the L-shaped groove 14, the odor adsorbent in the L-shaped groove 14 treats the pungent gas to reduce the pungent odor;

[0030] And because the photocuring reaction is an exothermic reaction, and because the printing time of most photocuring printers is relatively long, the temperature of the photosensitive resin in the liquid tank 5 increases after a long reaction. By setting a heat conductive block 512, the heat released by the reaction in the liquid tank 5 can be discharged, and then the heat is dissipated into the annular pipe groove 51 through the heat dissipation pipe 511. When the gas is exhausted through the annular pipe groove 51, the heat emitted by the heat dissipation pipe can also be taken away, thereby reducing the temperature in the liquid tank 5 due to the exothermic reaction; preventing the adhesion between the release film and the printed body from increasing due to the excessive temperature in the liquid tank 5, reducing the service life of the release film, and reducing the service life of related electronic components in the printer; after layers of photocuring reactions, until the entire molded part is cured and formed, the molding platform plate 11 with the molded part is removed, and the molded part is removed with a tool to complete the entire 3D printing process.

[0031] As a specific embodiment of the present invention, the rotating unit 10 includes a gear 101, a transmission shaft 102, a first bevel gear 103, a second bevel gear 104 and a rotating member 105. The gear 101 is fixedly connected to the right side of the through slot via a rotating shaft at the right end. The right end of the transmission shaft 102 is fixedly connected to the gear 101 and the left end is fixedly connected to the first bevel gear 103. The first bevel gear 103 is meshed with the second bevel gear 104. The upper end of the second bevel gear 104 is fixedly connected to the through slot wall via a rotating shaft, and the lower end is fixedly connected with a rotating member 105. The side wall of the upper half of the slide 6 is fixedly connected with a rack 61, and the rack 61 cooperates with the gear 101. The rotating member 105 is detachably fixedly connected to the forming platform plate 11.

[0032] The support arm 9 and the forming platform plate 11 can be driven to move up and down to work normally by rotating the lead screw 7. In this process, since the rack 61 set on the side wall of the slide 6 is meshed with the tooth block 101 on the support arm 9, when the support arm 9 and the forming platform plate 11 move up and down to work normally, the gear 101 will rotate on the rack 61, and the gear 101 drives the transmission shaft 102 to rotate, and the transmission shaft 102 drives the first bevel gear 103 fixedly connected thereto to rotate, and the first bevel gear 103 is meshed with the second bevel gear 104, and the first bevel gear 103 drives the second bevel gear 104 rotates, the second bevel gear 104 rotates, and the rotating member 105 fixedly connected to it rotates accordingly. The rotation of the rotating member 105 drives the molding platform plate 11 to rotate. Since the scraper 12 fixedly connected to the support arm 9 is in contact with the upper surface of the molding platform plate 11, when the molding platform plate 11 moves down for processing reaction, the rotating scraper 12 can clean the dust on the surface of the molding platform plate 11 to prevent the dust from entering the liquid tank 5 and causing pollution to the resin liquid; after the processing is completed, the molding platform plate 11 moves up, and the liquid resin adhering to the surface of the molding platform plate 11 can be scraped off.

[0033] As a specific embodiment of the present invention, there are multiple scraping plates 12 which are evenly arranged on the upper surface of the forming platform plate 11.

[0034] Setting multiple scraping plates 12 can, on the one hand, more comprehensively scrape the liquid resin adhered to the surface of the forming platform plate 11. On the other hand, since the scraping plates 12 are in contact with the upper surface of the forming platform plate 11, when the scraping plates 12 are evenly arranged, they have a positioning effect when installing the forming platform plate 11, preventing the forming platform plate 11 from being installed obliquely and affecting the curing and forming.

[0035] As a specific embodiment of the present invention, a first groove is provided on the lower surface of the rotating member 105, a convex block matching the first groove is provided at the upper end of the forming platform plate 11, a first rectangular through hole is transversely provided in the part of the rotating member 105 that cooperates with the convex block, and a second rectangular through hole is longitudinally provided. The first rectangular through hole and the second rectangular through hole are arranged in a cross shape. Two "concave" blocks 16 are placed inside the first rectangular through hole. As Figure 3 shown, the concave sides of the two "concave" blocks 16 are mutually attached to form a rectangular hole of the same size as the second rectangular hole. A limiting block 17 is placed inside the second rectangular hole. Second grooves 172 are provided on the upper surfaces at both ends of the limiting block 17. Sliders 171 are slidably connected inside the second grooves 172. One end of a spring 173 is fixedly connected to the bottom end of the slider 171, and the other end of the spring 173 is fixedly connected to the bottom of the second groove 172.

[0036] When installing the forming platform plate 11, insert the convex block provided at the upper end of the forming platform plate 11 into the first groove provided on the lower surface of the rotating member 105. Place the two "concave" blocks 16 opposite to each other and insert them into the first rectangle. After pressing the slider 171 into the groove, insert the limiting block 17 into the second rectangular hole and pass through the rectangular hole formed in the middle of the "concave" block 16. The spring 173 in the groove pops out the slider 171 for limiting. The cross arrangement of the "concave" block 16 and the limiting block 17 restricts each other, making the connection between the rotating member 105 and the forming platform plate 11 more stable and preventing deviation during the rotation of the forming platform plate 11.

[0037] As a specific embodiment of the present invention, a ventilation opening 131 is provided at the bottom of the side surface of the light-shielding cover 13.

[0038] When the exhaust fan 15 exhausts the gas inside the light-shielding cover 13, the air pressure inside the light-shielding cover 13 is reduced. The ventilation opening 131 provided at the bottom of the side surface of the light-shielding cover 13 allows the air to circulate between the outside gas and the gas inside the light-shielding cover 13, preventing damage to the light-shielding cover 13 caused by too small air pressure inside the light-shielding cover 13. And the setting of the ventilation opening 131 facilitates people to pick up the light-shielding cover 13 after the forming is completed. Due to the air pressure difference, the smell inside the device rarely escapes into the outside through the ventilation hole 131 and can be ignored.

[0039] As a specific implementation of the present invention, the inner wall edge of the liquid tank 5 is provided with a slope, and a straight flow channel 52 is provided on the slope surface.

[0040] The inner wall edge of the liquid tank 5 is provided with a slope, and the slope surface is provided with a straight flow channel 52 so that the liquid resin scraped off the molding platform plate 11 and accidentally dropped onto the inner wall of the liquid tank 5 can be recollected into the liquid tank 5 along the straight flow channel 52.

[0041] Working principle:

[0042] When the light-curing printer 3 is working, a certain amount of resin liquid is injected into the liquid tank 5, and an odor adsorbent, such as activated carbon and high surface area silicate, is placed in the L-shaped groove 14 opened on the upper wall of the box body 1. The rotating unit 10 in the support arm 9 is detachably fixed to the molding platform plate 11, and the light shield 13 is covered on the upper surface of the box body 1; the motor 8 is started to drive the lead screw 7 to rotate so that the support arm 9 drives the molding platform plate 11 to move down to a curing distance of one layer from the pool membrane, and the computer is connected to the projector 2 and the object is projected onto the lower surface of the molding platform plate 11 through the projector 2 through the light-transmitting groove 3 and the tempered glass 4, and the object undergoes a photochemical reaction and curing with the resin liquid, and then the motor 8 works to drive the molding platform plate 11 to move up a layer of curing distance, and the projector 2 projects the resin liquid again for the next layer of photochemical reaction curing, and this is repeated continuously until the curing is formed;

[0043] During the curing reaction, the exhaust fan 15 fixedly connected to the right notch of the L-shaped groove 14 is started, and the exhaust fan 15 discharges the pungent gas emitted by the resin liquid in the light shield 13 through the L-shaped groove 14, the leather tube and the annular pipe groove 51 provided on the outer wall of the liquid groove 5. When the pungent gas passes through the L-shaped groove 14, the odor adsorbent in the L-shaped groove 14 processes the pungent gas to reduce the pungent odor;

[0044] And because the photocuring reaction is an exothermic reaction, and because the printing time of most photocuring printers is relatively long, the temperature of the photosensitive resin in the liquid tank 5 increases after a long reaction. By setting a heat conductive block 512, the heat released by the reaction in the liquid tank 5 can be discharged, and then the heat is dissipated into the annular pipe groove 51 through the heat dissipation pipe 511. When the gas is exhausted through the annular pipe groove 51, the heat emitted by the heat dissipation pipe can also be taken away, thereby reducing the temperature in the liquid tank 5 due to the exothermic reaction; preventing the adhesion between the release film and the printed body from increasing due to the excessive temperature in the liquid tank 5, reducing the service life of the release film, and reducing the service life of related electronic components in the printer; after layers of photocuring reactions, until the entire molded part is cured and formed, the molding platform plate 11 with the molded part is removed, and the molded part is removed with a tool to complete the entire 3D printing process.

[0045] The rotation of the lead screw 7 can drive the support arm 9 and the forming platform plate 11 to move up and down for normal operation. During this process, since the rack 61 provided on the side wall of the slide block 6 meshes with the tooth block 101 on the support arm 9, when the support arm 9 and the forming platform plate 11 move up and down for normal operation, the gear 101 will rotate on the rack 61. The gear 101 drives the transmission shaft 102 to rotate, and the transmission shaft 102 drives the first bevel gear 103 fixedly connected thereto to rotate. The first bevel gear 103 meshes with the second bevel gear 104, and the first bevel gear 103 drives the second bevel gear 104 to rotate. The rotating member 105 fixedly connected to the second bevel gear 104 rotates accordingly. The rotation of the rotating member 105 drives the forming platform plate 11 to rotate. Since the scraper 12 fixedly connected to the support arm 9 is in contact with the upper surface of the forming platform plate 11, when the forming platform plate 11 moves down for the processing reaction, the rotating scraper 12 can clean the dust on the surface of the forming platform plate 11 to prevent the dust from entering the liquid tank 5 and polluting the resin liquid; after the processing is completed, the forming platform plate 11 moves up, and the liquid resin adhered to the surface of the forming platform plate 11 can be scraped off.

[0046] Setting multiple scrapers 12 can, on the one hand, scrape the liquid resin adhered to the surface of the forming platform plate 11 more comprehensively. On the other hand, since the scraper 12 is in contact with the upper surface of the forming platform plate 11, when the scraper 12 is evenly arranged, it has a positioning effect when installing the forming platform plate 11, preventing the forming platform plate 11 from being installed obliquely and affecting the curing and forming.

[0047] When installing the forming platform plate 11, insert the convex block provided at the upper end of the forming platform plate 11 into the first groove opened on the lower surface of the rotating member 105. Place two "concave" blocks 16 opposite to each other and insert them into the first rectangle. After pressing the slider 171 into the groove, insert the limiting block 17 into the second rectangular hole and pass through the rectangular hole formed in the middle of the "concave" block 16. The spring 173 in the groove pops out the slider 171 for limiting. The "concave" block 16 and the limiting block 17 are cross-arranged and restrict each other, making the connection between the rotating member 105 and the forming platform plate 11 more stable and preventing the forming platform plate 11 from shifting during rotation.

[0048] When the exhaust fan 15 exhausts the gas in the light-shielding cover 13, the air pressure in the light-shielding cover 13 decreases. There is a ventilation port 131 opened at the bottom of the side of the light-shielding cover 13 to allow the air circulation between the outside gas and the gas in the light-shielding cover 13, preventing the light-shielding cover 13 from being damaged due to too small air pressure. And the setting of the ventilation port 131 facilitates people to pick up the light-shielding cover 13 after the forming is completed. Due to the air pressure difference, the odor inside the device rarely escapes into the outside from the ventilation hole 131 and can be ignored.

[0049] The inner wall edge of the liquid tank 5 is provided with a slope, and a direct flow channel 52 is provided on the slope surface, so that the liquid resin scraped from the forming platform plate 11 and accidentally falling on the inner wall of the liquid tank 5 can be re-collected into the liquid tank 5 along the direct flow channel 52.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A light-curing 3D printer, comprising a box body (1), a projector (2), a light-transmitting groove (3), a toughened glass (4), a liquid tank (5), a sliding seat (6), a lead screw (7), a motor (8), a support arm (9), a rotating unit (10), a forming platform plate (11), a squeegee (12) and a light-shielding cover (13); characterized in that: Inside the box body (1), a projector (2) is fixedly installed. A light-transmitting groove (3) is opened at the top of the box body (1). A tempered glass (4) is fixedly installed on the upper surface of the box body (1). A liquid tank (5) is fixedly installed on the upper surface of the tempered glass (4). An annular pipe groove (51) is opened on the outer wall of the liquid tank (5). The upper notch of the annular pipe groove (51) is opened on the upper surface of the outer wall of the liquid tank (5), and the lower notch of the annular pipe groove (51) is opened at the lower right end of the outer wall of the liquid tank (5). A heat dissipation pipe (511) is fixedly connected in the annular pipe groove (51). The material of the heat dissipation pipe (511) has good heat dissipation performance. A through groove is opened between the annular pipe groove (51) and the liquid tank. The through groove is fixedly and hermetically connected with a heat conduction block (512). The heat conduction block (512) is in contact with the heat dissipation pipe (511). The material of the heat conduction block (512) has good heat conduction performance. A slide seat (6) is fixedly installed on one side of the upper surface of the box body (1). A lead screw (7) is movably sleeved inside the slide seat (6). The lead screw (7) passes through the box body (1) and is fixedly connected with a motor (8). A support arm (9) is rotatably connected to the outer surface of the lead screw (7). The support arm (9) is slidably connected with the slide seat (6). A through groove is opened inside the support arm (9). A rotating unit (10) is arranged inside the through groove. The rotating unit (10) is detachably and fixedly connected with a forming platform plate (11). A scraper (12) is fixedly connected at the position of the support arm (9) corresponding to the forming platform plate (11). The forming platform plate (11) is frustum-shaped. The scraper (12) is in contact with the upper surface of the forming platform plate (11). An L-shaped groove (14) is opened on the upper surface of the box body (1). One end of a leather tube is fixedly connected to the left notch of the L-shaped groove (14). The other end of the leather tube is fixedly connected to the lower notch of the annular pipe groove (51). An exhaust fan (15) is fixedly connected to the right notch of the L-shaped groove (14). The rotating unit (10) includes a gear (101), a transmission shaft (102), a first bevel gear (103), a second bevel gear (104) and a rotating part (105). The gear (101) is rotatably connected to the right side of the through groove. The right end of the transmission shaft (102) is fixedly connected with the gear (101), and the left end is fixedly connected with the first bevel gear (103). The first bevel gear (103) is engaged with the second bevel gear (104). The upper end of the second bevel gear (101) is rotatably connected to the through groove, and the lower end is fixedly connected with the rotating part (105). A rack (61) is arranged on the side wall of the slide seat (6). The rack (61) is matched with the gear (101). The rotating part (105) is detachably and fixedly connected with the forming platform plate (11). There are multiple scraper plates (12) which are evenly arranged on the upper surface of the forming platform plate (11). The lower surface of the rotating member (105) is provided with a first groove, and the upper end of the forming platform plate (11) is provided with a convex block that cooperates with the first groove. A first rectangular through hole is transversely formed in the part of the rotating member (105) that cooperates with the convex block, and a second rectangular through hole is longitudinally formed. The first rectangular through hole and the second rectangular through hole are arranged in a cross shape. Two "concave" blocks (16) are placed inside the first rectangular through hole. The two "concave" blocks (16) are placed opposite to each other, and a rectangular hole of the same size as the second rectangular hole is formed in the middle. A limiting block (17) is placed inside the second rectangular hole. Second grooves (172) are formed on the upper surfaces of both ends of the limiting block (17). Sliders (171) are slidably connected inside the second grooves (172). One end of a spring (173) is fixedly connected to the bottom end of the slider (171), and the other end of the spring (173) is fixedly connected to the bottom of the second groove (172); By rotating the lead screw (7), the support arm (9) and the forming platform plate (11) can be driven to move up and down for normal operation. During this process, since the rack (61) provided on the side wall of the slide seat (6) meshes with the tooth block (101) on the support arm (9), when the support arm (9) and the forming platform plate (11) move up and down for normal operation, the gear (101) will rotate on the rack (61). The gear (101) drives the transmission shaft (102) to rotate, and the transmission shaft (102) drives the first bevel gear (103) fixedly connected thereto to rotate. The first bevel gear (103) meshes with the second bevel gear (104), and the first bevel gear (103) drives the second bevel gear (104) to rotate. The second bevel gear (104) rotates, and the rotating member (105) fixedly connected thereto rotates accordingly. The rotation of the rotating member (105) drives the forming platform plate (11) to rotate. Since the scraping plate (12) fixedly connected to the support arm (9) is in contact with the upper surface of the forming platform plate (11), when the forming platform plate (11) moves down for processing reaction, the rotating scraping plate (12) can clean the dust on the surface of the forming platform plate (11) to prevent dust from entering the liquid tank (5) and polluting the resin liquid; after the processing is completed, the forming platform plate (11) moves up, and the liquid resin adhered to the surface of the forming platform plate (11) can be scraped off; Setting multiple scraping plates (12) can, on the one hand, scrape off the liquid resin adhered to the surface of the forming platform plate (11) more comprehensively. On the other hand, since the scraping plate (12) is in contact with the upper surface of the forming platform plate (11), when the scraping plates (12) are evenly arranged, they have a positioning effect when installing the forming platform plate (11) to prevent the forming platform plate (11) from being installed obliquely and affecting the curing and forming; An air vent (131) is formed at the bottom of the side surface of the light-shielding cover (13); The inner wall edge of the liquid tank (5) is provided with a slope, and a direct flow channel (52) is provided on the slope surface.

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