Integrated scraper device of 3D printer
By designing an integrated scraper device of a 3D printer, integrating a two-way scraper mechanism and a modular powder box mechanism, the complex powder feeding method and powder pollution problems caused by the independent existence of scrapers and powder boxes in the existing technology are solved, and the powder warehouse is miniaturized , lightweight and efficient storage and printing of multi-element powders.
Patent Information
- Application Number
- CN202410329187.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-02-18
AI Technical Summary
The scraper and powder silo of existing metal 3D printers exist as independent modules, resulting in complex powder delivery methods. Only one powder can be placed in the silo, and the metal powder is easily affected by air during the powder addition process.
An integrated scraper device for 3D printers is designed, including a two-way scraper mechanism and a modular powder box mechanism. The two-way scraper mechanism is integrated with the modular powder box mechanism to realize the miniaturization, lightweighting and powder supply system of the powder chamber. Simplified. The internal isolation of the modular powder box mechanism is equipped with four-frame powder chambers to store different elemental powders to ensure that the powders do not contaminate each other during the flow process.
The powder chamber is miniaturized and lightweight, the powder supply system is simplified, and the storage and printing of multi-element powder is supported, ensuring the independent flow of the powder during the printing process, and avoiding mutual contamination of the powder.
Smart Images
Figure CN119457150A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of 3D printers, and in particular to an integrated scraper device of a 3D printer. Background Art
[0002] The printing principle of existing metal 3D printers is metal powder melting technology. During the entire printing process, metal powder needs to be continuously transported to the printing site (each layer of powder is transported for each printing). After the powder is transported to the printing site, a scraper is needed to spread the powder on the printing substrate at a certain thickness to meet the printing requirements. However, the scrapers and powder silos on the existing metal 3D printers on the market exist as independent modules in the equipment. At present, the mainstream powder feeding methods of 3D printers on the market are upper powder feeding, lower powder feeding, and powder feeder powder feeding, all of which exist as independent modules, and only one type of powder can be placed in the silo at a time. Scrapers mainly include unidirectional scrapers and bidirectional scrapers. The process of a unidirectional scraper is: take powder → the scraper evenly spreads the powder on the printing substrate and then returns to the origin → laser sintering printing → enters the cycle. The process of a bidirectional scraper is to take powder → scraper spreads powder → laser sintering printing → scraper returns to the origin (this is also a powder spreading process) → laser sintering printing → enter the cycle. In the existing powder supply method, the silo and the scraper are independent of each other, and external power is required to take powder to meet the function of quantitative powder taking. In addition, during the powder adding process in the silo, the metal powder is very likely to be affected by the air (the influence of air humidity on the dryness of the powder). Summary of the invention
[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an integrated scraper device for a 3D printer to solve the problems mentioned in the above background technology.
[0004] The objective of the present invention is achieved through the following technical solutions: an integrated scraper device of a 3D printer, comprising a bidirectional scraper mechanism and a modular powder box mechanism, wherein the modular powder box mechanism is mounted on the bidirectional scraper mechanism, wherein the bidirectional scraper mechanism comprises a scraper main frame, a powder limiting member and a scraper assembly, wherein the scraper main frame is provided with an installation channel extending through the scraper main frame along its own height direction, wherein the powder limiting member is mounted on the bottom of the scraper main frame, wherein the powder limiting member is provided with four powder channels extending through the powder limiting member along its own height direction, wherein the four powder channels are arranged at equal intervals along the length direction of the powder limiting member, wherein the scraper assemblies are arranged on both sides of the scraper main frame in the width direction, wherein the powder limiting member is provided with four powder channels extending through the powder limiting member in the height direction, wherein the powder limiting member is provided with four powder channels extending through the powder limiting member in the length direction of the powder limiting member ..., wherein the powder limiting member is provided with four powder channels extending through the powder limiting member, wherein the powder limiting member is provided with four powder channels extending through the powder limiting member, wherein the powder limiting member is provided with four powder channels extending through the powder limiting member, wherein the powder limiting member is provided with four powder channels extending through the powder limiting member, wherein the powder limiting member is provided with four powder channels extending through the powder limiting member, wherein the powder limiting member is provided with four powder channels extending through the powder limiting member, wherein the powder limiting member is provided with four powder channels The scraper assembly includes a scraper adjusting member, a scraper fixing member and a scraper strip, the scraper adjusting member is installed on the scraper main body frame, the scraper fixing member is connected to the side wall of the scraper adjusting member, and the scraper strip is installed on the bottom of the scraper fixing member. The modular powder box mechanism includes a transparent powder box and a powder box connector, and the transparent powder box is internally isolated and provided with four powder cavities for storing different element powders. The powder box connector is connected to the bottom of the transparent powder box, and the positions of the powder box connector corresponding to the four powder cavities are all penetrated by powder flow channels, and the bottom opening of the powder cavity is used to connect the powder flow channel, and the powder box connector is installed in the installation channel of the scraper main body frame.
[0005] In some embodiments, a rectangular table is integrally formed on both sides of the scraper main frame, and a leveling assembly is provided at both ends of the rectangular table. The leveling assembly includes a micrometer head and a tension spring. The scraper adjustment piece is installed on the scraper main frame by screws, and the scraper adjustment piece is located below the rectangular table. The two ends of the tension spring are respectively connected to the rectangular table and the scraper adjustment piece. The micrometer head is installed on the top of the rectangular table, and an adjustment hole is opened through the rectangular table. The telescopic head of the micrometer head passes through the adjustment hole and abuts against the scraper adjustment piece.
[0006] In some embodiments, a tension spring hole is formed through the rectangular platform, a tension spring screw is threadedly connected to the side wall of the rectangular platform, the tension spring screw passes through the tension spring hole, a mounting hole is formed on the top of the scraper adjustment member, a cotter pin is formed through the side wall of the scraper adjustment member, the cotter pin passes through the mounting hole, and the two ends of the tension spring are respectively mounted on the tension spring screw and the cotter pin.
[0007] In some embodiments, the powder limiting member is in a stepped shape, and its size gradually increases from top to bottom, and the top end of the powder limiting member is located in the mounting channel of the scraper main frame.
[0008] In some embodiments, the powder limiting member is located between the two scraper strips, the side wall of the powder limiting member contacts the side wall of the scraper strip, and self-adhesive silicone gaskets are embedded at both ends of the bottom of the powder limiting member, and the two ends of the self-adhesive silicone gasket are respectively connected to the two scraper strips.
[0009] In some embodiments, the scraper fixing member includes two half-shaped fixing members, and the two half-shaped fixing members are arranged and connected along the width direction of the scraper main body frame, and the top of the scraper strip is clamped between the two half-shaped fixing members.
[0010] In some embodiments, at least one protrusion is integrally formed on both sides of the scraper strip, and a limiting groove is provided on the end surface of the half-molded fixing piece close to the scraper strip, and the protrusion is fitted in the limiting groove.
[0011] In some embodiments, the distance between the bottom surface of the scraper bar and the bottom surface of the molding chamber is 1 mm.
[0012] In some embodiments, one end of the top of the scraper main frame is connected to a scraper connector, and an adapter plate is connected to the scraper connector.
[0013] The beneficial effects of the present invention are:
[0014] 1. The bidirectional scraper mechanism and the modular powder box mechanism are integrated to achieve miniaturization and lightness of the powder bin and simplification of the powder supply system.
[0015] 2. Realize the storage and printing of multi-element powders, and realize the simultaneous printing of diversified powders in a single print. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 A three-dimensional schematic diagram of an integrated scraper device of a 3D printer of the present invention Figure 1 ;
[0017] Figure 2 A three-dimensional schematic diagram of an integrated scraper device of a 3D printer of the present invention Figure 2 ;
[0018] Figure 3 A side view of an integrated scraper device of a 3D printer of the present invention;
[0019] Figure 4 It is a front view of an integrated scraper device of a 3D printer of the present invention;
[0020] Figure 5 It is a structural schematic diagram of a scraper main frame in an integrated scraper device of a 3D printer of the present invention;
[0021] Figure 6It is a schematic structural diagram of a powder limiting member in an integrated scraper device of a 3D printer according to the present invention;
[0022] Figure 7 It is a structural schematic diagram of a powder box connecting member in an integrated scraper device of a 3D printer of the present invention;
[0023] In the figure, 1-bidirectional scraper mechanism, 2-modular powder box mechanism, 3-scraper main frame, 4-powder limiting member, 5-installation channel, 6-powder channel, 7-scraper adjustment member, 8-scraper fixing member, 9-scraper strip, 10-transparent powder box, 11-powder box connecting member, 12-powder chamber, 13-powder flow channel, 14-rectangular table, 15-micrometer head, 16-tension spring, 17-screw, 18-adjustment hole, 19-tension spring hole, 20-tension spring screw, 21-installation hole, 22-cotter pin, 23-protrusion, 24-limiting groove, 25-self-adhesive silicone gasket, 26-scraper connector, 27-adapter plate. DETAILED DESCRIPTION
[0024] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.
[0025] like Figures 1 to 7As shown, an integrated scraper device of a 3D printer includes a bidirectional scraper mechanism 1 and a modular powder box mechanism 2. The modular powder box mechanism 2 is installed on the bidirectional scraper mechanism 1. The bidirectional scraper mechanism 1 and the modular powder box mechanism 2 are integrated to achieve miniaturization and lightness of the powder bin and simplification of the powder supply system. The bidirectional scraper mechanism 1 includes a scraper main frame 3, a powder limiting member 4 and a scraper assembly. The scraper main frame 3 is penetrated and provided with an installation channel 5 along its own height direction. The powder limiting member 4 is installed at the bottom of the scraper main frame 3. The powder limiting member 4 is installed along its own height direction. Four powder channels 6 are provided in the direction of the length of the powder limiting member 4, and the four powder channels 6 are arranged at equal intervals along the length direction of the powder limiting member 4. Scraper assemblies are provided on both sides of the scraper main frame 3 in the width direction. The scraper assembly includes a scraper adjusting member 7, a scraper fixing member 8 and a scraper strip 9. The scraper adjusting member 7 is installed on the scraper main frame 3, the scraper fixing member 8 is connected to the side wall of the scraper adjusting member 7, and the scraper strip 9 is installed at the bottom of the scraper fixing member 8. The modular powder box mechanism 2 includes a transparent powder box 10 and a powder box connecting member 11. The transparent powder box 10 is internally isolated and provided with four powder chambers. 12, used to store different element powders, so as to distinguish the four element powders, avoid mutual contamination of the powders during the flow process, and at the same time, realize the storage and printing of multi-element powders, and realize the simultaneous printing of diversified powders in a single printing. The powder box connector 11 is connected to the bottom of the transparent powder box 10, and the positions of the four powder chambers 12 corresponding to the powder box connector 11 are all penetrated by a powder flow channel 13, and the bottom opening of the powder chamber 12 is used to connect the powder flow channel 13. The powder box connector 11 is installed in the installation channel 5 of the scraper main frame 3, and the powder is supplied to the powder through the transparent powder box 10. Powder is put into the powder channel 6 of the end limiting part 4, and powders of different elements correspond to a separate powder channel 6, so that the element powders can flow independently during printing to prevent mutual contamination of the element powders. The powder falls on the bottom of the molding chamber through the powder channel 6, and the scraper device moves left and right as a whole to drive the scraper bar 9 to move and spread the powder. Since two sets of scraper assemblies are provided, a two-way powder spreading function is realized. The action flow of the scraper bar 9 is: reset → scraper bar 9 moves to the right → laser sintering printing → scraper bar moves to the left → laser sintering printing → enter the cycle.
[0026] Furthermore, the distance between the bottom surface of the scraper strip 9 and the bottom surface of the molding chamber is 1mm, and the stacking angle is stable. Angle stability refers to a special state in the stacking of some granular materials, in which the particles will form a slope at the edge of the stacking, and the angle of this slope is stable. When the angle of the slope is less than a certain critical value, the sand will remain stable and will not flow out of the container. The reason for this phenomenon is the balance between the friction and gravity between the particles. When the angle of the slope is less than the critical value, the friction can offset the gravity on the particles, so that the particles remain stable. If the angle of the slope exceeds the critical value, the gravity will exceed the friction, causing the sand to start flowing. In this application, because the powder is stored in a transparent powder box, there is a certain friction between the powders. And the distance between the bottom surface of the scraper strip 9 and the bottom surface of the molding chamber is 1mm, that is, the angle stacking principle is used to achieve the effect of placing the powder to overflow. The friction between the powders is used to prevent overflow (the fluidity of the powder is poorer than that of water). During the entire working process (printing process), the two-way scraper mechanism 1 and the modular powder box mechanism 2 are both in a powder state.
[0027] Furthermore, if Figures 1 to 4 As shown, one end of the top of the scraper main frame 3 is connected to a scraper connector 26, and an adapter plate 27 is connected to the scraper connector 26. The scraper device is installed as a whole on the moving structure of the molding chamber through the adapter plate 27, and the scraper device is driven to move as a whole through the moving structure of the molding chamber to spread powder.
[0028] In some embodiments, Figures 1 to 3As shown, both sides of the scraper main frame 3 are integrally formed with a rectangular platform 14, and both ends of the rectangular platform 14 are provided with a leveling component, the leveling component includes a micrometer head 15 and a tension spring 16, the scraper adjustment member 7 is installed on the scraper main frame 3 by a screw 17, the scraper adjustment member 7 is located below the rectangular platform 14, and the two ends of the tension spring 16 are respectively connected to the rectangular platform 14 and the scraper adjustment member 7, the micrometer head 15 is installed on the top of the rectangular platform 14, and an adjustment hole 18 is opened on the rectangular platform 14, and the telescopic head of the micrometer head 15 passes through the adjustment hole 18 and abuts against the scraper adjustment member 7. Before leveling the scraper adjustment member 7, first install the scraper adjustment member 7 on the scraper main frame 3 by screws 17, and the screws 17 are in an untightened state. Then measure the height of the two ends of the scraper adjustment member 7 by a measuring tool, and adjust the micrometer head 15 at the corresponding position according to the height error, so that the telescopic head of the micrometer head 15 pushes the scraper adjustment member 7 to deflect, and the rectangular table 14 and the scraper adjustment member 7 are mutually tightened by the tension spring 16. After the leveling is completed, tighten the screws 17 to lock the scraper adjustment member 7 on the scraper main frame 3 to ensure the parallelism of the scraper assembly. It is worth noting that the size of the through hole for the screw 17 to pass through the scraper adjustment member 7 is larger than the size of the screw 17, so that there is a relative space between the screw 17 and the scraper adjustment member 7 before it is tightened, which is convenient for adjusting the position of the scraper adjustment member 7 to make it leveled. After the screws 17 are tightened, the scraper adjustment member 7 is pressed against the scraper main frame 3 to complete the leveling installation of the scraper adjustment member 7.
[0029] Furthermore, if Figure 1 and Figure 2 As shown, a tension spring hole 19 is opened through the rectangular platform 14, and a tension spring screw 20 is threadedly connected to the side wall of the rectangular platform 14. The tension spring screw 20 passes through the tension spring hole 19. A mounting hole 21 is opened on the top of the scraper adjustment member 7, and a cotter pin 22 is penetrated through the side wall of the scraper adjustment member 7. The cotter pin 22 passes through the mounting hole 21. The two ends of the tension spring 16 are respectively sleeved on the tension spring screw 20 and the cotter pin 22, and the two ends of the tension spring 16 are detachably connected to the rectangular platform 14 and the scraper adjustment member 7, which is convenient for installation and disassembly.
[0030] In some embodiments, Figure 1 and Figure 6As shown, the powder limiting member 4 is in a stepped shape, and its size gradually increases from top to bottom. The top end of the powder limiting member 4 is located in the installation channel 5 of the scraper main frame 3, eliminating the gap between the powder limiting member 4 and the scraper main frame 3, so that the powder can completely flow into the bottom surface of the molding chamber through the powder channel 6. The powder limiting member 4 is located between the two scraper strips 9, and the side wall of the powder limiting member 4 contacts the side wall of the scraper strip 9. Self-adhesive silicone gaskets 25 are embedded at both ends of the bottom of the powder limiting member 4. The two ends of the self-adhesive silicone gasket 25 are respectively connected to the two scraper strips 9. The scraper strip 9 is attached to the outer wall of the powder limiting member 4 through the self-adhesive silicone gasket 25 to form a seal, thereby limiting the powder from entering between the scraper strip 9 and the powder limiting member 4.
[0031] In some embodiments, Figures 1 to 3 As shown, the scraper fixing member 8 includes two half-type fixing members, and the two half-type fixing members are arranged and connected along the width direction of the scraper main frame 3. The top of the scraper strip 9 is clamped between the two half-type fixing members, and the two half-type fixing members are connected by fixing screws, which is convenient for connecting and disassembling the two half-type fixing members, and convenient for replacing and installing the scraper strip 9. Both sides of the scraper strip 9 are integrally formed with at least one protrusion 23, and the end surface of the half-type fixing member close to the scraper strip 9 is provided with a limiting groove 24, and the protrusion 23 is adapted in the limiting groove 24, so as to enhance the connection strength between the scraper strip 9 and the scraper fixing member 8, so that the position of the scraper strip 9 will not change during the printing process.
[0032] In the description of the present invention, it is necessary to understand that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; and it is known to those skilled in the art that the beneficial effects to be achieved by the present invention are only to achieve better beneficial effects under specific circumstances compared with the current implementation schemes in the prior art, rather than to directly achieve the best use effect in the industry.
[0033] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.
Claims
1. An integrated scraper device for a 3D printer, characterized in that: The invention comprises a bidirectional scraper mechanism (1) and a modular powder box mechanism (2), wherein the modular powder box mechanism (2) is mounted on the bidirectional scraper mechanism (1), and the bidirectional scraper mechanism (1) comprises a scraper main frame (3), a powder limiting member (4) and a scraper assembly, wherein the scraper main frame (3) is provided with an installation channel (5) extending through the scraper main frame along its height direction, the powder limiting member (4) is mounted on the bottom of the scraper main frame (3), and the powder limiting member (4) is provided with four powder channels (6) extending through the powder limiting member (4) along its height direction, and the four powder channels (6) are arranged at equal intervals along the length direction of the powder limiting member (4), and the scraper assembly is arranged on both sides of the scraper main frame (3) in the width direction, and the scraper assembly comprises a scraper adjusting member (7), a scraper fixing member (8) and a scraper strip (9), and the scraper adjusting member (5) is provided with a plurality of powder channels (6) extending through the powder limiting member (4) along its height direction. The joint (7) is mounted on the scraper main frame (3), the scraper fixing member (8) is connected to the side wall of the scraper adjusting member (7), the scraper strip (9) is mounted on the bottom of the scraper fixing member (8), the modular powder box mechanism (2) comprises a transparent powder box (10) and a powder box connecting member (11), the transparent powder box (10) is provided with four isolated powder chambers (12) inside for storing different element powders, the powder box connecting member (11) is connected to the bottom of the transparent powder box (10), the powder box connecting member (11) is provided with powder flow channels (13) through the positions of the four powder chambers (12) corresponding to the powder chambers (12), the bottom of the powder chamber (12) is open for connecting the powder flow channels (13), and the powder box connecting member (11) is mounted in the mounting channel (5) of the scraper main frame (3).
2. The integrated scraper device of a 3D printer according to claim 1, characterized in that: Rectangular platforms (14) are integrally formed on both sides of the scraper main frame (3), and leveling components are arranged at both ends of the rectangular platform (14). The leveling components include a micrometer (15) and a tension spring (16). The scraper adjustment member (7) is mounted on the scraper main frame (3) by means of a screw (17). The scraper adjustment member (7) is located below the rectangular platform (14), and the two ends of the tension spring (16) are respectively connected to the rectangular platform (14) and the scraper adjustment member (7). The micrometer (15) is mounted on the top of the rectangular platform (14), and an adjustment hole (18) is formed through the rectangular platform (14). The telescopic head of the micrometer (15) passes through the adjustment hole (18) and abuts against the scraper adjustment member (7).
3. The integrated scraper device of a 3D printer according to claim 2, characterized in that: A tension spring hole (19) is formed through the rectangular platform (14); a tension spring screw (20) is threadedly connected to the side wall of the rectangular platform (14); the tension spring screw (20) passes through the tension spring hole (19); a mounting hole (21) is formed on the top of the scraper adjusting member (7); a cotter pin (22) is formed through the side wall of the scraper adjusting member (7); the cotter pin (22) passes through the mounting hole (21); and two ends of the tension spring (16) are respectively sleeved on the tension spring screw (20) and the cotter pin (22).
4. The integrated scraper device of a 3D printer according to claim 1, characterized in that: The powder limiting member (4) is in a stepped shape, and its size gradually increases from top to bottom. The top end of the powder limiting member (4) is located in the mounting channel (5) of the scraper main frame (3).
5. The integrated scraper device of a 3D printer according to claim 4, characterized in that: The powder limiting member (4) is located between the two scraper strips (9), the side wall of the powder limiting member (4) contacts the side wall of the scraper strip (9), and self-adhesive silicone gaskets (25) are embedded at both ends of the bottom of the powder limiting member (4), and the two ends of the self-adhesive silicone gasket (25) are respectively connected to the two scraper strips (9).
6. The integrated scraper device of a 3D printer according to claim 5, characterized in that: The scraper fixing member (8) comprises two half-shaped fixing members, the two half-shaped fixing members are arranged and connected along the width direction of the scraper main frame (3), and the top of the scraper strip (9) is clamped between the two half-shaped fixing members.
7. The integrated scraper device of a 3D printer according to claim 6, characterized in that: At least one protrusion (23) is integrally formed on both sides of the scraper strip (9), and a limiting groove (24) is provided on the end surface of the half-molded fixing piece close to the scraper strip (9), and the protrusion (23) is adapted to fit in the limiting groove (24).
8. The integrated scraper device of a 3D printer according to claim 1, characterized in that: The distance between the bottom surface of the scraper strip (9) and the bottom surface of the molding chamber is 1 mm.
9. The integrated scraper device of a 3D printer according to claim 1, characterized in that: One end of the top of the scraper main frame (3) is connected to a scraper connecting body (26), and an adapter plate (27) is connected to the scraper connecting body (26).