3D printing scraper convenient to disassemble and assemble

Abstract

The 3D printing scraper convenient to disassemble and assemble comprises a scraper base, a scraper groove, fixing clamps and a scraper body, the scraper base is installed on a 3D printer, the scraper groove is detachably formed in the scraper base, a scraper body installation groove for installing the scraper body is formed in the scraper groove, the scraper body is movably inserted into the scraper body installation groove, and the fixing clamps for fixing the scraper body are detachably arranged on the two sides of the scraper groove. The scraper can be quickly disassembled and assembled by disassembling the fixing clamp on one side of the scraper groove. The scraper has the advantages that the scraper is installed through the scraper installation groove formed in the scraper groove, after the scraper is inserted into the scraper installation groove, shaking of the scraper in the vertical direction is limited through cooperation of the limiting clamping groove in the scraper and the limiting clamping head on the scraper groove, the two ends of the scraper are fixed through the fixing clamps installed at the two ends of the scraper groove, and the scraper is fixed in the horizontal direction; omnibearing fixing of the scraper is achieved, damage caused by uneven fixing stress of the scraper is avoided, the scraper can be pulled out or inserted from the side face by disassembling one fixing clamp at one end of the scraper groove during disassembly and assembly, and rapid disassembly and assembly of the scraper are achieved.

Description

Technical Field

[0001] The utility model specifically relates to a 3D printing blade that is convenient for disassembly and assembly. Background Technique

[0002] Metal powder 3D printing is an additive manufacturing technology, which has the advantages of high design freedom and is suitable for manufacturing complex metal parts. It uses metal powder as raw material and constructs three-dimensional objects by melting and solidifying layer by layer. Its main manufacturing process is to use a laser or electron beam to melt on the powder according to the pre-designed model contour to form a layer of solid metal. Then, the manufacturing bed descends one layer, and a new layer of metal powder is spread by a blade, and the above process is repeated until the whole object is constructed.

[0003] The blade plays a crucial role in the printing process of metal powder 3D printing. Its main functions include evenly spreading powder, compacting powder, removing splashes, and controlling layer thickness. Therefore, the blade has an important impact on printing quality and efficiency, and it should be replaced in time when the blade has a chipped or worn edge.

[0004] The existing blade is clamped by a movable splint, and a row of screws is arranged on the splint. By tightening the screws, the splint is driven to clamp the blade. Some of the existing blades are made of ceramics. When manually tightening the screws, the splint is prone to uneven stress, resulting in local stress concentration of the blade, making the blade easy to damage. Moreover, when disassembling the blade, multiple screws need to be loosened, and the disassembly and assembly are relatively complex and inconvenient to use.

[0005] In Chinese Patent: 202022721947.5, titled: A Powder Spreading Blade Device for a 3D Printer, it is recorded that it includes a blade holder and a "U"-shaped powder dropping baffle with an opening facing forward; a first boss is formed at the front end of the bottom surface of the blade holder; a second boss is formed at the front end of the bottom surface of the first boss; a blade pressing plate is fixed on the rear end surface of the first boss by a countersunk head bolt; the blade is pressed on the rear end surface of the second boss by the blade pressing plate.

[0006] As shown in the attached drawings of Patent 202022721947.5, the fixing method of the blade in this patent is to fix it by using a movable blade pressing plate. This method is a common fixing method for existing blades. This method can play a fixing role, but it has the problems of inconvenient disassembly and assembly, uneven stress on the blade, easy damage, and reduced service life. Utility Model Content

[0007] The technical problem to be solved by the utility model is the problems of inconvenient disassembly and assembly of the existing blade mentioned in the background technique and easy damage due to uneven stress in the fixing of the existing blade.

[0008] In view of the above technical problems, a 3D printing scraper that is easy to disassemble and assemble is proposed; it is achieved by the following technical scheme: a 3D printing scraper that is easy to disassemble and assemble, including a blade seat, a blade slot, a fixing card and a scraper, the blade seat is installed on the 3D printer, the blade slot is detachably arranged on the blade seat, a scraper mounting groove for mounting the scraper is opened on the blade slot, the scraper is movably inserted in the scraper mounting groove, and the fixing cards for fixing the scraper are detachably arranged on both sides of the blade slot to fix the scraper in the blade slot. The scraper can be quickly disassembled and assembled by removing the fixing card on one side of the blade slot.

[0009] In the utility model, the scraper is installed by using the scraper installation groove provided on the blade groove. After the scraper is inserted into the scraper installation groove, the upper limit clamping groove of the scraper and the limit clamping head on the blade groove cooperate to limit the shaking of the scraper in the vertical direction. The two ends of the scraper are fixed by using the fixing clamps installed at the two ends of the blade groove to fix the scraper in the horizontal direction, thereby realizing all-round fixation of the scraper and avoiding the damage problem of the existing scraper caused by uneven fixing force. When disassembling and assembling, a fixing clamp at one end of the blade groove can be removed to draw out or insert the scraper, thereby realizing quick disassembly and assembly of the scraper and convenient use.

[0010] Preferably, the knife groove includes a limit card and a fixed card mounting hole. The limit card is arranged at the connection between the scraper mounting groove and the outside, and limits the longitudinal position of the scraper inserted in the scraper mounting groove. The fixed card mounting holes are arranged at both ends of the knife groove. The fixed card is arranged on the knife groove through the fixed card mounting hole, and limits the horizontal position of the scraper inserted in the scraper mounting groove. The setting of the limit card and the fixed card facilitates the full-scale fixing of the scraper in the knife groove, which prevents the scraper from shaking and avoids the phenomenon of uneven force.

[0011] Preferably, the scraper includes a blade and a limit slot, wherein the limit slot is arranged on the side of the blade and cooperates with the limit clamp on the blade slot. The setting of the limit slot facilitates cooperation with the limit clamp on the blade slot, thereby facilitating fixing the scraper in the blade slot and preventing the scraper from shaking.

[0012] Preferably, two blades are provided in the scraper, the two blades are distributed opposite to each other, and a limit slot is provided between the two blades. The two blades are provided so that the blade on one side of the scraper can be used after the blade on the other side is damaged, thereby improving the overall service life of the scraper.

[0013] Preferably, the fixing card includes a fixing plate and a limiting block, the fixing plate is arranged at the end of the blade groove, one end of the limiting block is arranged on the fixing plate, and the other end is inserted into the scraper mounting groove, the limiting block inserted into the scraper mounting groove contacts the blade arranged in the scraper mounting groove, and the setting of the limiting block further strengthens the restriction on the scraper, prevents the scraper from shaking in the scraper mounting groove in the blade groove, and improves the stability of the fixation.

[0014] Preferably, the knife seat includes a front baffle and a knife slot mounting groove. The front baffle is arranged on one side of the knife seat and is connected to the knife slot mounting groove. The knife slot can be detachably installed in the knife slot mounting groove. The arrangement of the knife seat facilitates the installation of the knife slot and is easy to use.

[0015] In the preferred embodiment of the technical solution of the utility model, a plurality of knife grooves are arranged in the knife groove mounting groove, and the plurality of knife grooves are distributed in parallel in the knife groove mounting groove. The arrangement of the plurality of knife grooves increases the number of scrapers installed on the knife holder, and by installing scrapers of different materials, a variety of metal powder materials are applicable.

[0016] Preferably, the multiple knife grooves arranged in the knife groove installation groove have different heights, and the heights of the multiple knife grooves decrease successively. Such an arrangement enables only the scraper installed on the highest knife groove to scrape the metal powder during printing, ensuring that scrapers of different materials correspond to the powder they scrape.

[0017] In the preferred embodiment of the technical solution of the utility model, a rear baffle is arranged on one side of the knife seat opposite to the front baffle, and the rear baffle is respectively connected to the knife seat and multiple knife grooves. The arrangement of the rear baffle facilitates fixing the knife grooves on the knife seat and is easy to use.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The technical solution of the utility model utilizes a scraper installation groove provided on the blade groove to install the scraper. After the scraper is inserted into the scraper installation groove, the upper limit groove of the scraper and the limit clamping head on the blade groove cooperate to limit the shaking of the scraper in the vertical direction. The two ends of the scraper are fixed by fixing cards installed at both ends of the blade groove to fix the scraper in the horizontal direction, thereby realizing all-round fixation of the scraper and avoiding the damage problem of the existing scraper caused by uneven fixing force. When disassembling and assembling, a fixing card at one end of the blade groove can be removed to draw out or insert the scraper from the side, thereby realizing quick disassembly and assembly of the scraper and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of the utility model Figure 1 ;

[0021] Figure 2 A three-dimensional diagram of the utility model Figure 2 ;

[0022] Figure 3 It is a three-dimensional schematic diagram of the knife seat;

[0023] Figure 4 It is a three-dimensional schematic diagram of the knife groove;

[0024] Figure 5 It is a three-dimensional schematic diagram of a fixed card;

[0025] Figure 6 It is a three-dimensional schematic diagram of a scraper;

[0026] Figure 7 It is a schematic diagram of the cooperation between the scraper, the knife groove and the fixing card;

[0027] Figure 8 This is an exploded view of the utility model;

[0028] Explanation of the accompanying drawings: 1-blade seat, 11-front baffle, 12-blade slot mounting slot, 2-rear baffle, 21-first fixing hole, 22-second fixing hole, 3-blade slot, 31-scraper mounting slot, 32-limiting clamp, 33-blade slot fixing hole, 34-fixing card mounting hole, 4-fixing card, 41-fixing plate, 42-limiting block, 5-scraper, 51-blade, 52-limiting clamp slot. DETAILED DESCRIPTION

[0029] The following will be combined with the attached embodiment of the utility model Figure 1-8 , the technical solutions in the embodiments of the utility model are described in detail. Example

[0030] like Figure 1 , 2 , 3 and 8, a 3D printing scraper that is easy to disassemble and assemble comprises a blade holder 1, a rear baffle 2, a blade slot 3, a fixing card 4 and a scraper 5. The blade holder 1 is fixed to the blade holder installation position on the 3D printer by screws, the blade slot 3 is fixed in the blade holder 1 by the rear baffle 2, the scraper 5 is movably inserted in the blade slot 3, and the fixing cards 4 are arranged at both ends of the blade slot 3 to fix the scraper 5 inserted in the blade slot 3.

[0031] The knife seat 1 is a stainless steel metal seat with a rectangular cross section. The main function of the knife seat 1 is to serve as a carrier for installing the knife groove 3 and the scraper 5. The movement of the knife seat 1 drives the scraper 5 to move, thereby achieving the scraping and spreading of metal powder.

[0032] In order to facilitate the installation of the knife groove 3, a rectangular groove is provided on the surface of the knife seat 1 perpendicular to the inner concave of the knife seat 1, and this groove is named the knife groove installation groove 12. The rear part of the knife groove installation groove 12 passes through the knife seat 1 and is connected to the outside. The knife groove 3 is placed in the knife groove installation groove 12.

[0033] Definition: In this embodiment, the side of the blade holder 1 on which the front baffle 11 is arranged is the front part, and the other side opposite thereto is the rear part. The direction in which the scraper 5 extends is the length direction and the length direction is also the horizontal direction, and the corresponding vertical direction is the longitudinal direction.

[0034] In order to facilitate the fixing of the knife groove 3 in the knife groove mounting groove 12, a metal plate with a rectangular cross-section is protruded on the side of the knife seat 1 that is not connected to the outside world. This metal plate is named the front baffle 11. The knife groove 3 placed in the knife groove mounting groove 12 is in contact with the inner side surface of the front baffle 11. At the same time, a mounting hole corresponding to the knife groove fixing hole 33 on the knife groove 3 is concavely opened on the inner side surface of the front baffle 11. The knife groove 3 is fixed in the knife seat 1 through screws and the knife groove fixing hole 33.

[0035] In order to conveniently fix the knife groove 3 in the knife groove installation groove 12 on the knife seat 1, a rear baffle plate 2 is arranged at the rear of the knife seat 1 corresponding to the front baffle plate 11.

[0036] The rear baffle 2 is a metal plate with a rectangular cross-section. The length of the rear baffle 2 is the same as that of the knife seat 1. Two groups of circular through holes are opened on the surface of the rear baffle 2, wherein a group of circular holes close to the edge of the rear baffle 2 is a first fixing hole 21, and the other group of circular holes is a second circular hole 22. The first fixing hole 21 corresponds to the side surface of the rear part of the knife seat 1. The rear baffle 2 is fixed to the knife seat 1 by screws through the first fixing hole 21. The second circular hole 22 corresponds to the position of the knife groove fixing hole 33 on the knife groove 3. The knife groove 3 is fixed to the knife seat 1 by screws and the second circular hole 22.

[0037] like Figure 1 , 4 As shown in FIG. 8 , the knife groove 3 is a metal plate with a certain thickness and a rectangular cross section. A scraper installation groove 31 with a “U”-shaped cross section is opened in the knife groove 3 along the length direction of the knife groove 3 , and the scraper 5 is inserted in the scraper installation groove 31 .

[0038] The main function of the knife groove 3 is to serve as a carrier for installing the scraper 5. The scraper 5 is installed in the knife groove 3. The scraper 5 is restricted by the structure of the knife groove 3 to prevent the scraper 5 from shaking in the knife groove 3, thereby ensuring the stability of the scraper 5 fixation.

[0039] The scraper mounting groove 31 is a groove with a "U"-shaped cross section. The width of the scraper mounting groove 31 is the same as the maximum width of the scraper 5. The scraper mounting groove 31 penetrates the blade groove 3 along the length direction of the blade groove 3, and the open end of the "U"-shaped cross section of the scraper mounting groove 31 is connected to the outside.

[0040] After the scraper 5 is inserted into the scraper mounting groove 31, in order to limit the scraper 5 inserted in the scraper mounting groove 31 in the longitudinal direction, on the two oppositely distributed side walls of the scraper mounting groove 31, there is a limiting clamp 32 with a rectangular cross-section protruding outward near the opening end. The limiting clamp 32 extends along the length direction of the knife groove 3 and is the same length as the knife groove 3. There is a certain distance between the two oppositely distributed limiting clamps 32. When the scraper 5 is inserted into the knife groove mounting groove 12, the limiting clamp 52 on the scraper 5 cooperates with the limiting clamp 32 in the knife groove mounting groove 12 to prevent the scraper 5 from shaking longitudinally in the scraper mounting groove 31.

[0041] After the scraper 5 is inserted into the scraper mounting groove 31, in order to limit the scraper 5 inserted in the scraper mounting groove 31 in the horizontal direction and complete the all-round restriction of the scraper 5, a fixing card mounting hole 34 for mounting a fixing card 4 is opened on the side surfaces at both ends of the blade groove 3 perpendicular to the blade groove 3. The fixing card 4 is fixed to the two ends of the blade groove 3 through the fixing card mounting hole 34 to limit the scraper 5 inserted in the scraper mounting groove 31.

[0042] In order to conveniently fix the knife groove 3 in the knife seat 1, a group of circular through holes are opened on the side surface of the knife groove 3 in the length direction and perpendicular to the knife groove 3. These circular through holes are named knife groove fixing holes 33, and multiple knife groove fixing holes 33 are distributed at intervals on the knife groove 3.

[0043] Different scrapers 5 of different materials are required for metal powders. In order to facilitate the storage of the scrapers, multiple knife grooves 3 can be installed in the knife groove mounting groove 12 on the knife seat 1. This embodiment preferably uses four knife grooves 3, and a scraper 5 is installed in each knife groove 3.

[0044] In order to facilitate the fixation of the knife groove 3 and ensure the normal use of the scraper 5, the four knife grooves 3 placed in the knife groove mounting groove 12 have different heights, and the four knife grooves 3 are arranged in sequence according to height. This arrangement allows the scraper 5 to be installed in the knife groove 3. Among the four scrapers 5 in the four knife grooves 3, one is the highest, and only the highest scraper 5 can contact the metal powder to perform the scraping action. When the scraper 5 needs to be replaced when the powder material is replaced, it is only necessary to replace the corresponding scraper 5 to the highest knife groove 3. In addition, the knife groove fixing holes 33 opened on the four knife grooves 3 arranged side by side have the same height in the horizontal direction, that is, one screw can pass through the four knife grooves 3 at the same time to fix the knife groove 3 on the knife seat 1.

[0045] like Figure 1 , 5 As shown in FIG. 8 , the fixing card 4 includes a fixing plate 41 and a limiting block 42 , and the limiting block 42 is fixed on the fixing plate 41 .

[0046] The fixing plate 41 is a metal block with a rectangular cross-section. A circular hole penetrating the fixing plate 41 is opened on the surface of the fixing plate 41. The fixing plate 41 is screwed to one end of the knife groove 3 through the circular hole and screws, wherein the circular hole on the fixing plate 41 corresponds to the fixing card mounting holes 34 at both ends of the knife groove 3.

[0047] The limit block 42 is a metal block with a triangular cross-section. The limit block 42 is welded to the fixing plate 41. When the fixing plate 41 is fixed to one end of the knife groove 3, the limit block 42 is inserted into the scraper mounting groove 31 on the knife groove 3, and contacts the scraper 5 inserted in the scraper mounting groove 31, thereby limiting the scraper 5.

[0048] In order to facilitate the limitation of the blade 51 on the scraper 5 by the limit block 42, the cross-sectional area of ​​the limit block 42 is equal to half of the cross-sectional area of ​​the scraper mounting groove 31, and the area of ​​the blade 51 in the scraper 5 is equal to half of the cross-sectional area of ​​the scraper mounting groove 31. When the scraper 5 needs to be limited, the limit block 42 on the fixed card 4 is inserted into the scraper mounting groove 31, and contacts with the scraper 5 inserted in the scraper mounting groove 31 to limit the scraper 5. The scraper 5 is limited in all directions by the limit card head 32 on the blade groove 3 and the fixed card 4.

[0049] like Figure 1 , 6 As shown in FIGS. 7 and 8 , the length of the scraper 5 is the same as that of the blade groove 3 , and the scraper 5 includes two blades 51 , which are oppositely distributed and connected together, and a limit slot 52 is provided between the two blades 51 to cooperate with the upper limit clamp 32 on the blade groove 3 .

[0050] The cross-section of the blade 51 is triangular, and the size of the cross-section of the blade 51 is half of the cross-section of the scraper mounting groove 31. When the scraper 5 and the limit block 42 are both inserted into the scraper mounting groove 31, the inclined surface of the limit block 42 contacts the inclined surface of the blade 51, further limiting the position of the scraper 5 and preventing the scraper 5 from shaking in the scraper mounting groove 31.

[0051] The two blades 51 on the scraper 5 are distributed opposite to each other and are integrally formed. The cross-section of the scraper is a parallelogram. When the scraper 5 is inserted into the scraper mounting groove 31, one blade 51 is outside the blade groove 3, and the other blade 51 is inside the scraper mounting groove 31 of the blade groove 3. When one blade 51 is worn, the blade 51 on the other side can be replaced and continued to be used, thereby improving the overall service life of the scraper 5.

[0052] In order to improve the stability of the scraper 5 when inserted in the scraper mounting groove 31, on the scraper 5, the connection between the two blades 51 is recessed along the length direction of the scraper 5 with two limiting grooves 52 with rectangular cross-sections. The limiting grooves 52 can cooperate with the limiting clamps 32 on the blade groove 3 to effectively prevent the scraper 5 from shaking in the blade groove 3.

[0053] The disassembly and assembly process of the scraper 5 in this embodiment: when the scraper 5 needs to be replaced, loosen the screws on the fixing plate 41 on the fixing card 4, then the fixing card 4 can be pulled out from the scraper installation groove 31 on the knife groove 3, and then the scraper 5 is pulled out from the scraper installation groove 31 from the side of the knife groove 3, and the scraper 5 is disassembled;

[0054] When the scraper 5 needs to be installed, first loosen the screws on the fixing plate 41 on the fixing card 4, then pull the fixing card 4 out of the scraper installation groove 31 on the knife groove 3, then insert the scraper 5 into the scraper installation groove 31 from the side of the knife groove 3, and then reinstall the fixing card 4, thus completing the disassembly of the scraper 5, which is convenient and quick to disassemble and assemble.

[0055] This technical solution has the following advantages:

[0056] 1. Easy to disassemble and assemble. Compared with the existing fixing method of multiple screws and clamps, this solution only needs to loosen one screw on the fixing card 4 to remove the scraper 5 from the knife groove 3. The scraper is easy to disassemble and assemble, which greatly saves time;

[0057] 2. Stable fixation, uniform force, and the scraper is not easy to be damaged. In this solution, the scraper 5 is inserted into the scraper installation groove 31, and the scraper 5 is fixed in the longitudinal direction by the cooperation of the limit clamp head 32 and the limit clamp groove 52. The scraper 5 is fixed in the transverse direction by the fixing clamp 4, completing the all-round fixation of the scraper. The fixation is simple and the force is uniform, the damage to the scraper 5 is small, and the service life of the scraper is increased.

[0058] The above embodiments are only for illustrating the technical idea of ​​the present technical solution, and cannot be used to limit the protection scope of the present technical solution. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present technical solution shall fall within the protection scope of the present technical solution.

Claims

1. A 3D printing scraper that is easy to assemble and disassemble, characterized by: The invention comprises a knife seat (1), a knife groove (3), a fixing card (4) and a scraper (5), wherein the knife seat (1) is mounted on a 3D printer, the knife groove (3) is detachably mounted on the knife seat (1), a scraper mounting groove (31) for mounting the scraper (5) is provided on the knife groove (3), the scraper (5) is movably inserted into the scraper mounting groove (31), and the fixing cards (4) for fixing the scraper (5) are detachably mounted on both sides of the knife groove (3), and the scraper (5) is fixed in the knife groove (3). The fixing card (4) on one side of the knife groove (3) is removed to quickly disassemble and install the scraper (5).

2. The easily disassembled 3D printing scraper according to claim 1, characterized in that: The blade groove (3) includes a limiting clamp head (32) and a fixed clamp mounting hole (34). The limiting clamp head (32) is arranged at a position where the scraper mounting groove (31) is connected to the outside, and limits the longitudinal position of the scraper (5) inserted in the scraper mounting groove (31). The fixed clamp mounting holes (34) are arranged at both ends of the blade groove (3). The fixed clamp (4) is arranged on the blade groove (3) through the fixed clamp mounting hole (34), and limits the transverse position of the scraper (5) inserted in the scraper mounting groove (31).

3. The easily disassembled 3D printing scraper according to claim 1, characterized in that: The scraper (5) comprises a blade (51) and a limiting slot (52), wherein the limiting slot (52) is arranged on the side of the blade (51) and cooperates with the limiting clamp (32) on the blade groove (3).

4. The easily disassembled 3D printing scraper according to claim 3, characterized in that: Two blades (51) are provided in the scraper (5), the two blades (51) are distributed opposite to each other, and the limiting slot (52) is provided between the two blades (51).

5. The easily disassembled 3D printing scraper according to claim 1, characterized in that: The fixing card (4) includes a fixing piece (41) and a limiting block (42). The fixing piece (41) is arranged at the end of the blade groove (3). One end of the limiting block (42) is arranged on the fixing piece (41) and the other end is inserted into the scraper installation groove (31). The limiting block (42) inserted into the scraper installation groove (31) contacts the blade (51) arranged in the scraper installation groove (31).

6. The easily disassembled 3D printing scraper according to claim 1, characterized in that: The knife seat (1) comprises a front baffle (11) and a knife groove installation groove (12). The front baffle (11) is arranged on one side of the knife seat (1) and is communicated with the knife groove installation groove (12). The knife groove (3) is detachably installed in the knife groove installation groove (12).

7. The easily disassembled 3D printing scraper according to claim 6, characterized in that: A plurality of knife grooves (3) are provided in the knife groove installation groove (12), and the plurality of knife grooves (3) are distributed in parallel in the knife groove installation groove (12).

8. The easily disassembled 3D printing scraper according to claim 7, characterized in that: The plurality of knife grooves (3) arranged in the knife groove installation groove (12) have different heights, and the heights of the plurality of knife grooves (3) decrease in sequence.

9. The easily disassembled 3D printing scraper according to claim 1, characterized in that: A rear baffle (2) is provided on one side of the knife seat (1) opposite to the front baffle (11), and the rear baffle (2) is respectively connected to the knife seat (1) and the plurality of knife grooves (3).

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