Powder feeding mechanism for DLP sintering 3D printer

Abstract

The invention relates to the technical field of DLP sintering 3D printers, and discloses a powder feeding mechanism for a DLP sintering 3D printer, the powder feeding mechanism comprises a workbench, a cleaning device is arranged on the upper surface of the workbench, the cleaning device comprises a carrying frame, the carrying frame is located above the workbench, the upper surface of the workbench is fixedly connected with a guide rod, and the guide rod is fixedly connected with the workbench. And the carrying frame is in sliding connection with the surface of the guide rod. According to the powder forming device, the push plate, the baffle and the material guide plate work cooperatively, redundant materials can be effectively cleaned while powder is pushed to the forming cylinder, the redundant materials enter the collecting box through the material guide groove, the situation that the powder is accumulated on the surface of the workbench is avoided, the working area is kept clean and tidy, and environmental pollution and material waste caused by powder scattering are reduced; and when the carrying frame resets, the positioning wheel is matched with the stop block to ensure that the push plate is separated from the surface of the workbench, powder is prevented from being pushed back, and thoroughness and stability of cleaning work are ensured.

Description

Technical Field

[0001] This invention relates to the field of DLP sintering 3D printer technology, specifically to a powder feeding mechanism for a DLP sintering 3D printer. Background Technology

[0002] DLP sintering 3D printing technology uses a high-energy laser beam to selectively sinter powdered raw materials, forming the powder into a shape. This technology is characterized by its simplicity, wide range of selectable materials, low cost, and high forming efficiency, and is widely used in aerospace, prototype concept design, mold manufacturing and other fields.

[0003] Currently, in DLP sintering 3D printing, a scraper reciprocating motion is often used to supply powder material. However, when the scraper resets, it easily pushes some material back, affecting the printing quality and causing contamination of the worktable surface. It also wastes material and affects the normal use of the equipment. To address this, we propose a powder feeding mechanism for DLP sintering 3D printers. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a powder feeding mechanism for a DLP sintering 3D printer. This mechanism solves the problem that in existing DLP sintering 3D printing, the reciprocating motion of a scraper is often used to supply powder materials. However, when the scraper resets, it tends to push some material back, affecting print quality, causing contamination of the worktable surface, wasting material, and affecting the normal operation of the equipment.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a powder feeding mechanism for a DLP sintering 3D printer, comprising a worktable, a cleaning device provided on the upper surface of the worktable, the cleaning device including a carrier frame located above the worktable, a guide rod fixedly connected to the upper surface of the worktable, the carrier frame slidably connected to the surface of the guide rod, a positioning frame fixedly connected to the upper surface of the worktable, a support rod fixedly connected to the upper surface of the carrier frame, the support rod slidably connected to the surface of the positioning frame, and two symmetrically arranged positioning wheels rotatably connected to the inner wall of the carrier frame, the two positioning wheels being close to each other on one side. A shaft is fixedly connected, and a push plate is fixedly connected to the surface of the shaft. A first stop block is fixedly connected to the surface of the positioning wheel, and a second stop block is fixedly connected to the surface of the positioning wheel. The push plate, the stop block, and the guide plate work together to push the powder to the forming cylinder while effectively cleaning up excess material. The excess material enters the collection box through the guide chute, preventing powder from accumulating on the workbench surface, keeping the work area clean, and reducing environmental pollution and material waste caused by powder scattering. In addition, when the carrier is reset, the cooperation between the positioning wheel and the stop block ensures that the push plate is disengaged from the workbench surface, preventing the powder from being pushed back, and ensuring the thoroughness and stability of the cleaning work.

[0006] Preferably, a mounting bracket is fixedly connected to the upper surface of the worktable, a near-infrared DLP projector is fixedly connected to the lower surface of the mounting bracket, a reflective lens is fixedly connected to the lower surface of the mounting bracket, a powder supply cylinder is fixedly connected to the inner wall of the worktable, a forming cylinder is fixedly connected to the inner wall of the worktable, a first support plate is fixedly connected to the inner wall of the powder supply cylinder, a first cylinder is fixedly connected to the upper surface of the first support plate, a first piston plate is fixedly connected to the driving end of the first cylinder, the first piston plate is slidably connected to the inner wall of the powder supply cylinder, and a second support is fixedly connected to the inner wall of the forming cylinder. The second support plate has a second cylinder fixedly connected to its upper surface. The driving end of the second cylinder is fixedly connected to a second piston plate. The driving end of the second piston plate is slidably connected to the inner wall of the forming cylinder. Through precise powder feeding and efficient cleaning, the powder distribution in the forming cylinder is ensured to be uniform, and there is no excess powder interference on the worktable surface, providing a stable environment for 3D printing. When the near-infrared DLP projector projects light to solidify the powder, the printing accuracy and quality will not be affected by powder accumulation or scattering, which helps to improve the printing success rate, reduce the defect rate, and ensure the continuity and reliability of the printing process.

[0007] Preferably, two symmetrically arranged tie rods are fixedly connected to the upper surface of the carrier. A nozzle is fixedly connected to the end of the tie rod away from the carrier, and a conduit is fixedly connected to the input end of the nozzle to facilitate spraying light absorber onto the powder material in the forming cylinder through the nozzle.

[0008] Preferably, a base is fixedly connected to the upper surface of the worktable, a servo motor is fixedly connected to the inner wall of the base, a screw is fixedly connected to the drive end of the servo motor, a protrusion is fixedly connected to one side of the carrier, the screw is threadedly connected to the inner wall of the protrusion, a stabilizing block is fixedly connected to the upper surface of the worktable, and the end of the screw away from the servo motor is rotatably connected to the surface of the stabilizing block. The servo motor drives the screw to rotate, thereby stabilizing and adjusting the movement of the carrier.

[0009] Preferably, the surface of the pusher plate is fixedly connected to two symmetrically arranged baffles, and the end of the baffle away from the pusher plate is fixedly connected to an inclined guide plate to facilitate the pushing of powder materials.

[0010] Preferably, the surface of the workbench is provided with a material collection device, which includes a collection box and a feed hole. The collection box is located below the workbench, and the feed hole is located on the upper surface of the workbench. A guide groove is provided on the upper surface of the workbench, and the guide groove is connected to the feed hole. A handle is fixedly connected to the surface of the collection box. The inside of the guide groove is inclined. When excess powder material enters the guide groove, it flows down the inclined surface through the feed hole into the collection box.

[0011] Preferably, a baffle is fixedly connected to the lower surface of the workbench, the baffle is fastened to the feed inlet of the collection box, a locking block is fixedly connected to the surface of the collection box, and a mounting bolt is threadedly connected to the inner wall of the locking block. One end of the mounting bolt is threaded into the workbench, and the collection box can conveniently collect the cleaned powder material. After a certain amount has been collected, the mounting bolt can be unscrewed to pull out the collection box and recycle the powder, realizing the recycling of materials. This not only reduces production costs and raw material waste, but also conforms to the concept of green production, improves resource utilization, and enhances the economic and environmental benefits of the equipment.

[0012] Preferably, the lower surface of the worktable is provided with a striking device, which includes a stabilizing base. A drive motor is fixedly connected to the inner wall of the stabilizing base, and a rotating rod is fixedly connected to the drive end of the drive motor. A support block is fixedly connected to the lower surface of the worktable. The end of the rotating rod away from the drive motor is rotatably connected to the surface of the support block. A collar is fixedly connected to the surface of the rotating rod, and three circumferentially arrayed paddles are fixedly connected to the surface of the collar. A striking plate is fixedly connected to the end of the paddles away from the collar. The surface of the worktable has a mounting groove, and a hollow plate is inserted into the mounting groove. When stubborn powder adheres to the surface of the worktable, the striking device functions. The drive motor drives the rotating rod, collar, paddles, and striking plate to rotate. The flexible paddles and striking plate strike the rubber block on the hollow plate to generate vibration, shaking off the stubborn powder. Springs assist the paddles and striking plate in resetting, ensuring that the striking device works continuously and stably. This effectively solves the powder adhesion problem and avoids the impact of powder residue on subsequent printing quality and normal equipment operation.

[0013] Preferably, a positioning plate is fixedly connected to the surface of the leaf, a spring is fixedly connected to the side of the positioning plate away from the collar, and the end of the spring away from the positioning plate is fixedly connected to the surface of the striking plate.

[0014] Preferably, a pull ring is fixedly connected to the surface of the hollow plate, a rubber block is fixedly connected to the lower surface of the hollow plate, a stop bar is rotatably connected to the surface of the worktable, and a control rod is fixedly connected to the surface of the stop bar. The rubber block effectively reduces the noise generated by the leaf-pulling and tapping plate operation, facilitating normal use of the equipment. When the hollow plate is deformed and damaged, it is only necessary to pull the control rod to move the stop bar away from one side of the hollow plate, and then pull the stop bar to remove and replace the damaged hollow plate.

[0015] In summary, the technical effects and advantages of this invention are as follows: 1. In this invention, the push plate, baffle, and guide plate work together to effectively clean up excess material while pushing the powder to the forming cylinder. The excess material enters the collection box through the guide trough, preventing powder from accumulating on the workbench surface, keeping the work area clean, and reducing environmental pollution and material waste caused by powder scattering. In addition, when the carrier is reset, the cooperation between the positioning wheel and the stop block ensures that the push plate is disengaged from the workbench surface, preventing the powder from being pushed back, and ensuring the thoroughness and stability of the cleaning work.

[0016] 2. In this invention, precise powder feeding and efficient cleaning ensure uniform powder distribution in the molding cylinder and no excess powder interference on the worktable surface, providing a stable environment for 3D printing. When the near-infrared DLP projector projects light to solidify the powder, the printing accuracy and quality will not be affected by powder accumulation or scattering, which helps to improve the printing success rate, reduce the defect rate, and ensure the continuity and reliability of the printing process.

[0017] 3. In this invention, when stubborn powder adheres to the surface of the worktable, the tapping device comes into play. The drive motor drives the rotating rod, collar, paddle, and tapping plate to rotate. The flexible paddle and tapping plate strike the rubber block on the hollow plate to generate vibration, shaking off the stubborn powder. The spring assists the paddle and tapping plate to reset, ensuring that the tapping device works continuously and stably, effectively solving the powder adhesion problem and avoiding the impact of powder residue on subsequent printing quality and normal equipment operation.

[0018] 4. In this invention, the collection box can conveniently collect the cleaned powder material. After a certain amount has been collected, the collection box can be pulled out by unscrewing the mounting bolts to recycle the powder, realizing the recycling of materials. This not only reduces production costs and waste of raw materials, but also conforms to the concept of green production, improves resource utilization, and enhances the economic and environmental benefits of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a powder feeding mechanism for a DLP sintering 3D printer according to the present invention. Figure 2 This is a side view of a powder feeding mechanism for a DLP sintering 3D printer according to the present invention. Figure 3 This invention relates to a powder feeding mechanism for a DLP sintering 3D printer. Figure 2 A schematic diagram of the structure at point A; Figure 4 This is a bottom view schematic diagram of a powder feeding mechanism for a DLP sintering 3D printer according to the present invention. Figure 5 This invention relates to a powder feeding mechanism for a DLP sintering 3D printer. Figure 4 A schematic diagram of the structure at point B; Figure 6 This invention relates to a powder feeding mechanism for a DLP sintering 3D printer. Figure 4 A schematic diagram of the structure at point C; Figure 7 This is a partial exploded view of a powder feeding mechanism for a DLP sintering 3D printer according to the present invention. Figure 8 This is a schematic diagram of the exploded structure of the striking device in the powder feeding mechanism of a DLP sintering 3D printer according to the present invention. Figure 9 This is a cross-sectional view of the hollow plate in the powder feeding mechanism for a DLP sintering 3D printer according to the present invention. Figure 10 This is a schematic diagram of the structure of the carrier in the powder feeding mechanism for a DLP sintering 3D printer according to the present invention; Figure 11This invention relates to a powder feeding mechanism for a DLP sintering 3D printer. Figure 10 A side view structural diagram.

[0020] In the diagram: 1. Workbench; 2. Powder supply cylinder; 3. Forming cylinder; 4. Cleaning device; 41. Positioning frame; 42. Support rod; 43. Guide rod; 44. Stabilizing block; 45. Screw; 46. Protrusion; 47. Servo motor; 48. Base; 49. Carrier frame; 410. Tie rod; 411. Nozzle; 412. Guide tube; 413. Shaft; 414. Positioning wheel; 415. First stop block; 416. Push plate; 417. Baffle; 418. Guide plate; 419. Second stop block; 5. Material collection device; 51. Collection box; 52. Feed hole; 53. Guide trough; 54. Handle; 55. Baffle frame; 56. Clamping block; 57. Mounting bolt; 6. Striking device; 61. Hollow plate; 62. Stop bar; 63. Control rod; 64. Support block; 65. Rotating rod; 66. Collar; 67. Leaf; 68. Striking plate; 69. Positioning plate; 610. Spring; 611. Stabilizing seat; 612. Drive motor; 613. Pull ring; 614. Rubber block; 615. Mounting slot; 7. Mounting bracket; 8. Near-infrared DLP projector; 9. Reflecting lens; 10. First support plate; 11. Second support plate; 12. First cylinder; 13. First piston plate; 14. Second cylinder; 15. Second piston plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] refer to Figures 1-11The powder feeding mechanism for a DLP sintering 3D printer shown includes a worktable 1. A cleaning device 4 is provided on the upper surface of the worktable 1. The cleaning device 4 includes a carrier 49, which is located above the worktable 1. A guide rod 43 is fixedly connected to the upper surface of the worktable 1. The carrier 49 is slidably connected to the surface of the guide rod 43. A positioning frame 41 is fixedly connected to the upper surface of the worktable 1. A support rod 42 is fixedly connected to the upper surface of the carrier 49. The support rod 42 is slidably connected to the surface of the positioning frame 41. Two symmetrically arranged positioning wheels 414 are rotatably connected to the inner wall of the carrier 49. A shaft 413 is fixedly connected to the side of the two positioning wheels 414 that are close to each other. The surface of the shaft 413 is fixedly connected to... A push plate 416 is attached, and a first stop 415 is fixedly connected to the surface of the positioning wheel 414. A second stop 419 is fixedly connected to the surface of the positioning wheel 414. The push plate 416, the stop 417, and the guide plate 418 work together to push the powder to the forming cylinder 3 while effectively cleaning up excess material. The excess material enters the collection box 51 through the guide groove 53, which avoids the accumulation of powder on the surface of the workbench 1, keeps the work area clean, and reduces environmental pollution and material waste caused by powder scattering. In addition, when the carrier 49 is reset, the cooperation between the positioning wheel 414 and the stop ensures that the push plate 416 is disengaged from the surface of the workbench 1, preventing the powder from being pushed back, and ensuring the thoroughness and stability of the cleaning work.

[0023] The workbench 1 has a mounting bracket 7 fixedly connected to its upper surface, a near-infrared DLP projector 8 fixedly connected to its lower surface, a reflective lens 9 fixedly connected to its lower surface, a powder supply cylinder 2 fixedly connected to its inner wall, a forming cylinder 3 fixedly connected to its inner wall, a first support plate 10 fixedly connected to its inner wall, a first cylinder 12 fixedly connected to its upper surface, a first piston plate 13 fixedly connected to its driving end, the first piston plate 13 slidingly connected to the inner wall of the powder supply cylinder 2, and a second support plate 11 fixedly connected to the inner wall of the forming cylinder 3. A second cylinder 14 is fixedly connected to the upper surface of the second support plate 11. A second piston plate 15 is fixedly connected to the drive end of the second cylinder 14. The drive end of the second piston plate 15 is slidably connected to the inner wall of the forming cylinder 3. Through precise powder feeding and efficient cleaning, the powder distribution in the forming cylinder 3 is ensured to be uniform, and there is no excess powder interference on the surface of the worktable 1, which provides a stable environment for 3D printing. When the near-infrared DLP projector projects light to solidify the powder, the printing accuracy and quality will not be affected by powder accumulation or scattering, which helps to improve the printing success rate, reduce the defect rate, and ensure the continuity and reliability of the printing process.

[0024] Two symmetrically arranged pull rods 410 are fixedly connected to the upper surface of the carrier 49. A nozzle 411 is fixedly connected to the end of the pull rod 410 away from the carrier 49. A conduit 412 is fixedly connected to the input end of the nozzle 411, so as to spray the light absorber into the powder material in the molding cylinder 3 through the nozzle 411.

[0025] The worktable 1 has a base 48 fixedly connected to its upper surface, a servo motor 47 fixedly connected to its inner wall, a screw 45 fixedly connected to the drive end of the servo motor 47, a protrusion 46 fixedly connected to one side of the carrier 49, the screw 45 being threadedly connected to the inner wall of the protrusion 46, a stabilizing block 44 fixedly connected to the upper surface of the worktable 1, and the end of the screw 45 away from the servo motor 47 being rotatably connected to the surface of the stabilizing block 44. The servo motor 47 drives the screw 45 to rotate, thereby stabilizing and adjusting the movement of the carrier 49.

[0026] Among them, two symmetrically arranged baffles 417 are fixedly connected to the surface of the push plate 416. An inclined guide plate 418 is fixedly connected to the end of the baffle 417 away from the push plate 416 to facilitate the pushing of powder materials.

[0027] The workbench 1 is equipped with a material collection device 5, which includes a collection box 51 and a feed hole 52. The collection box 51 is located below the workbench 1, and the feed hole 52 is located on the upper surface of the workbench 1. A guide groove 53 is provided on the upper surface of the workbench 1, and the guide groove 53 is connected to the feed hole 52. A handle 54 is fixedly connected to the surface of the collection box 51. The inside of the guide groove 53 is inclined. When excess powder material enters the guide groove 53, it enters the collection box 51 along the inclined surface through the feed hole 52.

[0028] The lower surface of the workbench 1 is fixedly connected to a baffle 55, which is fastened to the feed inlet of the collection box 51. The surface of the collection box 51 is fixedly connected to a locking block 56, and the inner wall of the locking block 56 is threaded with a mounting bolt 57. One end of the mounting bolt 57 is threaded into the workbench 1. The collection box 51 can easily collect the cleaned powder material. After a certain amount has been collected, the mounting bolt 57 can be unscrewed to pull out the collection box 51 and recycle the powder. This realizes the recycling of materials, which not only reduces production costs and reduces raw material waste, but also conforms to the concept of green production, improves resource utilization, and enhances the economic and environmental benefits of the equipment.

[0029] The workbench 1 has a striking device 6 on its lower surface. The striking device 6 includes a stabilizing base 611, a drive motor 612 fixedly connected to the inner wall of the stabilizing base 611, a rotating rod 65 fixedly connected to the drive end of the drive motor 612, a support block 64 fixedly connected to the lower surface of the workbench 1, and a collar 66 fixedly connected to the surface of the rotating rod 65 away from the drive motor 612. Three circularly arranged paddles 67 are fixedly connected to the surface of the collar 66, and a striking plate 68 is fixedly connected to the end of each paddle 67 away from the collar 66. The surface has a mounting groove 615, and a hollow plate 61 is inserted into the mounting groove 615. When stubborn powder adheres to the surface of the worktable 1, the tapping device 6 is activated. The drive motor 612 drives the rotating rod 65, collar 66, blade 67 and tapping plate 68 to rotate. The flexible blade 67 and tapping plate 68 strike the rubber block 614 on the hollow plate 61 to generate vibration, shaking off the stubborn powder. The spring 610 assists the blade 67 and tapping plate 68 to reset, ensuring that the tapping device 6 works continuously and stably, effectively solving the powder adhesion problem and avoiding the impact of powder residue on subsequent printing quality and normal equipment operation.

[0030] Among them, a positioning plate 69 is fixedly connected to the surface of the leaf 67, and a spring 610 is fixedly connected to the side of the positioning plate 69 away from the collar 66. The end of the spring 610 away from the positioning plate 69 is fixedly connected to the surface of the striking plate 68.

[0031] The hollow plate 61 is fixedly connected to a pull ring 613, and a rubber block 614 is fixedly connected to the lower surface of the hollow plate 61. A stop bar 62 is rotatably connected to the surface of the worktable 1, and a control rod 63 is fixedly connected to the surface of the stop bar 62. The rubber block 614 effectively reduces the noise emitted by the leaf 67 and the striking plate 68 during operation, facilitating the normal use of the equipment. When the hollow plate 61 is deformed and damaged, it is only necessary to pull the control rod 63 to move the stop bar 62 away from one side of the hollow plate 61, and then pull the stop bar 62 to remove and replace the damaged hollow plate 61.

[0032] The working principle of this invention is as follows: Before production, the first cylinder 12 is controlled to drive the first piston plate 13 downward, and then powder material is added to the powder supply cylinder 2. During processing, the first cylinder 12 is controlled to push the first piston plate 13 upward, thereby pushing out part of the powder material from the powder supply cylinder 2. The second cylinder 14 is controlled to drive the second piston plate 15 downward a certain distance, and then the servo motor 47 is controlled to drive the screw 45 to rotate. The screw 45 then drives the protrusion 46 and the carrier 49 to move. When the carrier 49 moves, the positioning wheel 414 rotates. When the first stop 415 abuts against the surface of the carrier 49, the positioning wheel 414 cannot rotate. At this time, the positioning wheel 414... 14. The lower end of the push plate 416 is driven by the shaft 413 to press against the upper surface of the worktable 1. The carrier 49 drives the push plate 416, baffle 417 and guide plate 418 to move continuously. The push plate 416, together with the baffle 417 and guide plate 418, pushes the powder material out of the feeding cylinder upward. Then the powder material is pushed into the forming cylinder 3. At the same time, light absorber is sprayed into the powder material in the forming cylinder 3 through the guide tube 412 and the nozzle 411. Then the excess material is continuously pushed forward by the push plate 416. After the material enters the guide trough 53, it enters the collection box 51 through the feed hole 52 along the inclined surface of the guide trough 53, completing the feeding and cleaning collection operation of the powder material. Subsequently, the servo motor 47 drives the screw 45 to reverse, causing the protrusion 46 and the carrier 49 to move in the opposite direction. Then, the positioning wheel 414 reverses and drives the push plate 416, baffle 417, and guide plate 418 to rotate via the shaft 413. When the second stop 419 abuts against the surface of the carrier 49, the lower end of the push plate 416 disengages from the upper surface of the worktable 1. Then, the positioning wheel 414 stops rotating, thus stably driving the carrier 49 to reset. During the reset process, the carrier 49 will not be supported on the surface of the worktable 1, preventing the powder material from being pushed back and ensuring stable production operations. When some material still accumulates on the surface of the worktable 1, the drive motor 612 is controlled to drive the screw 45 to rotate, once again driving the carrier 49 to move towards the feed hole 52. The push plate 416 pushes the excess material on the surface of the worktable 1 into the guide groove 53. Then, the carrier 49 is controlled to reset, completing the material supply and cleaning operations. The near-infrared DLP projector projects light onto the powder layer in the forming cylinder 3 through the reflective lens 9, solidifying the powder in the designated area. This process is repeated layer by layer to complete the 3D printing. To perform multi-layer printing, the above operation can be repeated. When stubborn powder adheres to the surface of workbench 1, the drive motor 612 can be turned on to rotate the rotating rod 65. The rotating rod 65 drives the collar 66, the paddle 67, and the striking plate 68 to rotate. The paddle 67 and the striking plate 68 are made of flexible material. When the front end of the paddle 67 and the striking plate 68 hit the rubber block 614 on the hollow plate 61, they deform. The hollow plate 61 is impacted and the vibration is fed back to workbench 1, thereby shaking off the powder and preventing it from adhering to workbench 1. At the same time, the spring 610 is deformed by force. After one set of paddles 67 and striking plates 68 rotates away, the spring 610 assists the paddles 67 and striking plates 68 to return to their original position. Then, the next set of paddles 67 and striking plates 68 repeats the above operation. After observing that the powder has been shaken off, the drive motor 612 can be turned off, and the above operation can be repeated to push the shaken material into the feed hole 52 for cleaning and collection. After a certain amount of powder material has been collected, the mounting bolt 57 can be unscrewed, and the handle 54 can be pulled out to recycle the powder material. After the operation is completed, the collection box 51 is pushed into the baffle 55, and then the mounting bolt 57 is tightened again to complete the installation of the collection box 51, which will ensure that the equipment can carry out subsequent processing operations.

[0033] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer for control.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A powder feeding mechanism for a DLP sintering 3D printer, comprising a worktable (1), characterized in that: A cleaning device (4) is provided on the upper surface of the workbench (1). The cleaning device (4) includes a carrier (49). The carrier (49) is located above the workbench (1). A guide rod (43) is fixedly connected to the upper surface of the workbench (1). The carrier (49) is slidably connected to the surface of the guide rod (43). A positioning frame (41) is fixedly connected to the upper surface of the workbench (1). A support rod (42) is fixedly connected to the upper surface of the carrier (49). The support rod (42) is slidably connected to the surface of the positioning frame (41). Two symmetrically arranged positioning wheels (414) are rotatably connected to the inner wall of the carrier (49). A shaft (413) is fixedly connected to the side of the two positioning wheels (414) that are close to each other. A push plate (416) is fixedly connected to the surface of the shaft (413). A first stop (415) is fixedly connected to the surface of the positioning wheel (414). A second stop (419) is fixedly connected to the surface of the positioning wheel (414).

2. The powder feeding mechanism for a DLP sintering 3D printer according to claim 1, characterized in that: A mounting bracket (7) is fixedly connected to the upper surface of the workbench (1), a near-infrared DLP projector (8) is fixedly connected to the lower surface of the mounting bracket (7), a reflective lens (9) is fixedly connected to the lower surface of the mounting bracket (7), a powder supply cylinder (2) is fixedly connected to the inner wall of the workbench (1), a forming cylinder (3) is fixedly connected to the inner wall of the workbench (1), a first support plate (10) is fixedly connected to the inner wall of the powder supply cylinder (2), and a first air supply cylinder (10) is fixedly connected to the upper surface of the first support plate (10). The first cylinder (12) has a first piston plate (13) fixedly connected to its driving end. The first piston plate (13) is slidably connected to the inner wall of the powder supply cylinder (2). The inner wall of the forming cylinder (3) has a second support plate (11) fixedly connected to its inner wall. The upper surface of the second support plate (11) has a second cylinder (14) fixedly connected to its upper surface. The driving end of the second cylinder (14) has a second piston plate (15) fixedly connected to its driving end. The driving end of the second piston plate (15) is slidably connected to the inner wall of the forming cylinder (3).

3. The powder feeding mechanism for a DLP sintering 3D printer according to claim 1, characterized in that: Two symmetrically arranged tie rods (410) are fixedly connected to the upper surface of the carrier (49). A nozzle (411) is fixedly connected to the end of the tie rod (410) away from the carrier (49), and a conduit (412) is fixedly connected to the input end of the nozzle (411).

4. The powder feeding mechanism for a DLP sintering 3D printer according to claim 1, characterized in that: A base (48) is fixedly connected to the upper surface of the workbench (1). A servo motor (47) is fixedly connected to the inner wall of the base (48). A screw (45) is fixedly connected to the drive end of the servo motor (47). A protrusion (46) is fixedly connected to one side of the carrier (49). The screw (45) is threadedly connected to the inner wall of the protrusion (46). A stabilizing block (44) is fixedly connected to the upper surface of the workbench (1). The end of the screw (45) away from the servo motor (47) is rotatably connected to the surface of the stabilizing block (44).

5. The powder feeding mechanism for a DLP sintering 3D printer according to claim 1, characterized in that: The surface of the push plate (416) is fixedly connected to two symmetrically arranged baffles (417), and an inclined guide plate (418) is fixedly connected to one end of the baffle (417) away from the push plate (416).

6. The powder feeding mechanism for a DLP sintering 3D printer according to claim 1, characterized in that: The surface of the workbench (1) is provided with a material collection device (5), which includes a collection box (51) and a feed hole (52). The collection box (51) is located below the workbench (1), and the feed hole (52) is located on the upper surface of the workbench (1). A guide groove (53) is provided on the upper surface of the workbench (1), and the guide groove (53) is connected to the feed hole (52). A handle (54) is fixedly connected to the surface of the collection box (51).

7. A powder feeding mechanism for a DLP sintering 3D printer according to claim 6, characterized in that: A baffle (55) is fixedly connected to the lower surface of the workbench (1). The baffle (55) is fastened to the feed inlet of the collection box (51). A locking block (56) is fixedly connected to the surface of the collection box (51). An installation bolt (57) is threadedly connected to the inner wall of the locking block (56). One end of the installation bolt (57) is threaded into the workbench (1).

8. The powder feeding mechanism for a DLP sintering 3D printer according to claim 1, characterized in that: The lower surface of the workbench (1) is provided with a striking device (6), which includes a stabilizing seat (611). A drive motor (612) is fixedly connected to the inner wall of the stabilizing seat (611). A rotating rod (65) is fixedly connected to the drive end of the drive motor (612). A support block (64) is fixedly connected to the lower surface of the workbench (1). The end of the rotating rod (65) away from the drive motor (612) is rotatably connected to the surface of the support block (64). A collar (66) is fixedly connected to the surface of the rotating rod (65). Three circular arrays of paddles (67) are fixedly connected to the surface of the collar (66). A striking plate (68) is fixedly connected to the end of the paddles (67) away from the collar (66). A mounting groove (615) is opened on the surface of the workbench (1), and a hollow plate (61) is inserted in the mounting groove (615).

9. A powder feeding mechanism for a DLP sintering 3D printer according to claim 8, characterized in that: A positioning plate (69) is fixedly connected to the surface of the leaf (67). A spring (610) is fixedly connected to the side of the positioning plate (69) away from the collar (66). The end of the spring (610) away from the positioning plate (69) is fixedly connected to the surface of the striking plate (68).

10. A powder feeding mechanism for a DLP sintering 3D printer according to claim 8, characterized in that: A pull ring (613) is fixedly connected to the surface of the hollow plate (61), a rubber block (614) is fixedly connected to the lower surface of the hollow plate (61), a stop bar (62) is rotatably connected to the surface of the workbench (1), and a control rod (63) is fixedly connected to the surface of the stop bar (62).

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