Coating device of laser 3D printer

Abstract

The invention relates to a laser 3D printer coating device which comprises a movable powder scattering mechanism, the movable powder scattering mechanism is slidably arranged at the upper end of a lifting powder containing cavity and used for scattering powder to the lifting powder containing cavity, and the powder storage top face of the lifting powder containing cavity can be coplanar with the top face of the lifting powder containing cavity; according to the powder spreading device, the connecting body is driven by the electric driving trolley to spread powder to the lifting powder containing cavity along the two sliding blocks, the connecting body moves to drive the scraper set to conduct blade coating work on metal powder from different heights in the powder discharging process through the multiple discharging openings, and the situation that too thick powder overflows and scatters in the single-time coating work is avoided; and the air pushing part synchronously moves along with the connecting body, so that the powder laying angle is corrected, the powder laying area is expanded, the flatness of the powder laying area is protected, a small amount of metal powder is prevented from being adsorbed and falling along with the coating process, and the coating quality of the metal powder is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of laser 3D printers, and in particular to a laser 3D printer coating device. Background Art

[0002] The working principle of laser 3D printers is based on the principle of layer-by-layer superposition. Three-dimensional objects are created by stacking materials layer by layer and laser sintering. Each layer of powder must be flat, and then the height of the printed part is controlled by adjusting the thickness of the powder cavity.

[0003] During the molding process, the powder spreading method is one of the main factors affecting molding accuracy. The existing patent number CN201820050829.6 for a coating device for a laser sintering 3D printer has baffles at both ends of the bracket, which are open and face the front of the roller in the direction of travel. This constrains the metal powder in front of the roller to always be within the range of the opening formed by the baffles at both ends of the bracket. The metal powder that runs to the side of the roller due to the edge effect is re-gathered in front of the roller, avoiding the problem of uneven powder height caused by the edge effect. However, this patent has the following problems: During the metal powder coating process, the large amount of powder coating and the lack of stratification measures can easily cause the metal powder to overflow the powder tank during the process; A single coating job can easily cause metal powder to stick together, and the stuck metal powder will fall during the next coating distance or process, affecting the smoothness of the coating. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the technical problems in the prior art where metal powder coating easily overflows the powder cylinder and a single coating adheres and falls disorderly, affecting the next coating, and provide a laser 3D printer coating device.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a laser 3D printer coating device, comprising: A movable powder spreading mechanism, the movable powder spreading mechanism being slidably disposed at the upper end of the lifting powder chamber and configured to spread powder into the lifting powder chamber, wherein the top surface of the lifting powder chamber storing powder can be coplanar with the top surface thereof; The movable powder spreading mechanism includes two sliders mirror-imaged on both sides of the lifting powder storage chamber, two electric-driven trolleys slidably arranged on the two sliders, a connector arranged on the top of the two electric-driven trolleys, a plurality of discharge ports connected to the lower end of the connector, a delivery pump arranged in the connector, a telescopic hose inserted through the connector and connected to the input end of the delivery pump, a scraper group arranged at the lower end of the connector, and a wind pushing part arranged on the connector, wherein When the connector slides radially, the plurality of discharge ports can discharge powder material into the lifting powder chamber, and the wind pushing portion can trim the powder material paving surface to be scraped flat by the scraper group.

[0006] Furthermore, the laser 3D printer coating device further includes a transition portion; The transition portion includes a first cavity provided in the connecting body, a column rotatably provided in the lower half of the first cavity, a plurality of through holes provided in a straight line on the column, and a motor provided at one end of the connecting body; The motor shaft of the motor is connected to the column; Several of the through holes can communicate with several of the discharge ports, wherein By driving the motor, the column can drive the plurality of through holes to switch and connect with the plurality of discharge ports, so that the powder in the first cavity can be quantitatively discharged through the plurality of discharge ports.

[0007] Furthermore, the first cavity includes a triangular cavity and a cylindrical cavity; The triangular cavity is connected to the cylindrical cavity at the bottom, and the column can rotate in the cylindrical cavity.

[0008] Further, the scraper group includes a first scraper provided at the lower end of the connector, a second scraper provided at the lower end of the connector, and a third scraper provided at the lower end; The bottom surface of the first scraper is higher than the bottom surface of the second scraper.

[0009] Furthermore, the bottom surface of the second scraper is an inclined surface, and the upper part of the inclined surface faces the first scraper, and the lower part of the inclined surface faces the third scraper; The first scraper, the second scraper, and the third scraper are capable of scraping powder at different heights.

[0010] Furthermore, the wind pushing portion includes a second cavity provided in the connecting body, a fan provided inside the second cavity, and a third cavity provided on the first scraper and connected to the second cavity; One end of the third cavity is connected to a plurality of twisted oblique tubes; The tube opening of the twisted inclined tube faces the discharge port, wherein The fan is driven, and wind is discharged through the second cavity and the third cavity through the plurality of twisted inclined tubes, so that the wind pushes the powder to be spread horizontally.

[0011] Furthermore, the wind pushing portion further includes a plurality of transverse tubes penetrating and communicating with the second scraper, a plurality of bent cavities provided on the second scraper and vertically communicating with the plurality of transverse tubes, and a plurality of first exhaust pipes obliquely communicating with the plurality of bent cavities, wherein; The wind is discharged through the third cavity, the plurality of transverse tubes, the plurality of bent cavities and the plurality of the first exhaust pipes, so that the wind pushes the powder to be spread forward and backward.

[0012] Furthermore, the wind pushing part further includes a plurality of vertical pipes connected to the lower ends of the plurality of horizontal pipes; Several vertical tubes are located between the second scraper and the third scraper, and the bottom end surface of the vertical tube is parallel to the bottom end surface of the second scraper, wherein The wind can be discharged through the plurality of horizontal pipes and the plurality of vertical pipes so that the wind pushes the powder downwards to be flush.

[0013] The beneficial effect of the present invention is that the invention drives the electric drive trolley to allow the connector to spread powder along the two slide blocks to the lifting powder chamber. The connector moves through the plurality of discharge ports to discharge powder, driving the scraper group to scrape the metal powder from different heights, thereby preventing excessively thick powder from overflowing and scattering during a single coating operation. Moreover, the air push part of the present invention also moves synchronously with the connector, so that the powder spreading angle can be corrected, the powder spreading area can be expanded, and the flatness of the powder spreading area can be protected, thereby preventing a small amount of metal powder from being adsorbed and falling during the coating process, and ensuring the coating quality of the metal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and examples.

[0015] Figure 1 is a perspective view of a preferred embodiment of the present invention from a first viewing angle; Figure 2 is a front view of a preferred embodiment of the present invention from a second viewing angle; Figure 3 The present invention Figure 3 Enlarged view of point A in the middle; Figure 4 This is a schematic side view of the connector structure of the present invention; Figure 5 It is a schematic side sectional view of the connector of the present invention.

[0016] In the picture: 1. Movable powder spreading mechanism; 11. Slider; 12. Electric drive trolley; 13. Connector; 14. Discharge port; 15. Telescopic hose; 16. Scraper assembly; 161. First scraper; 162. Second scraper; 163. Third scraper; 17. Air push unit; 171. Second cavity; 172. Fan; 173. Third cavity; 174. Horizontal pipe; 175. Bending cavity; 176. First exhaust pipe; 177. Vertical pipe; 178. Twisted oblique pipe; 2. Lifting powder chamber; 3. Transition portion; 31. First cavity; 311. Triangular cavity; 312. Cylindrical cavity; 32. Column; 33. Through hole; 34. Motor. DETAILED DESCRIPTION

[0017] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0018] like Figure 1-5 As shown, the present invention provides a laser 3D printer coating device, comprising: The movable powder spreading mechanism 1 is slidingly arranged at the upper end of the lifting powder chamber 2. The movable powder spreading mechanism 1 is used to spread powder into the lifting powder chamber 2. The top surface of the powder stored in the lifting powder chamber 2 can be coplanar with its top surface. The lifting powder chamber 2 is a public technical component on the main body of the existing laser 3D printer. It can drive the stored powder to gradually descend a height during the powder spreading process to meet the laser printing requirements. This is an existing technology and will not be explained here.

[0019] The movable powder spreading mechanism 1 includes two sliders 11 mirror-imaged on both sides of the lifting powder storage chamber 2, two electric-driven trolleys 12 slidingly arranged on the two sliders 11, and a connector 13 arranged at the top of the two electric-driven trolleys 12. The slider 11 acts as a guide rail, and the electric-driven trolley 12 can drive the connector 13 to move radially based on the effect of the guide rail to avoid the deviation of the powder spreading trajectory. It is connected to several discharge ports 14 arranged at the lower end of the connector 13, a conveying pump arranged in the connector 13, and a telescopic hose 15 inserted through the connector 13 and connected to the input end of the conveying pump. The telescopic hose 15 can be extended and retracted with the radial movement of the connector 13. The input end of the conveying pump inputs the powder in the powder bin of the laser 3D printer into the connector 13 through the telescopic hose 15 and discharges it from the several discharge ports 14, so that the powder spreading work can proceed normally. A scraper group 16 is arranged at the lower end of the connector 13, and a wind pushing part 17 is arranged on the connector 13, wherein When the connector 13 slides radially, the plurality of discharge ports 14 can discharge powder material into the lifting powder chamber 2, and the wind push portion 17 can trim the powder material paving surface so that the scraper group 16 can cooperate to scrape it flat. Specifically, the present invention drives the connector 13 along the two sliders 11 to spread powder on the lifting powder chamber 2 through the driving work of the electric drive trolley 12. The connector 13 moves through the plurality of discharge ports 14 to discharge powder, driving the scraper group 16 to scrape the metal powder from different heights, thereby preventing excessively thick powder from overflowing and scattering during a single coating operation, allowing the powder to be scraped flat in a distributed manner. The process can be more gentle, resulting in a better coating effect. In addition, the wind push part 17 of the present invention also moves synchronously with the connector 13, so that the powder spreading angle can be corrected, the powder spreading area can be expanded, and the flatness of the powder spreading area can be protected, thereby preventing a small amount of metal powder from being adsorbed and falling during the coating process, thereby ensuring the coating quality of the metal powder. The wind force acts on the metal powder from another measure requirement, so that the adhesion of the metal powder is effectively controlled.

[0020] In the present invention, the multiple discharge ports 14 are at different distances from the connector 13 to the delivery pump, which cannot guarantee the same time point and amount of powder discharge, resulting in inconsistent powder discharge at multiple locations in the lifting powder chamber 2. Optionally, the laser 3D printer coating device further includes a transition portion 3; The transition portion 3 includes a first cavity 31 disposed in the connecting body 13, a column 32 rotatably disposed in the lower half of the first cavity 31, a plurality of through holes 33 disposed in a straight line on the column 32, and a motor 34 disposed at one end of the connecting body 13; The motor 34 has a shaft connected to the column 32 ; The plurality of through holes 33 can be connected to the plurality of discharge ports 14, wherein By driving the motor 34, the column 32 can drive the plurality of through holes 33 to switch and connect with the plurality of discharge ports 14, so that the powder in the first cavity 31 can be quantitatively discharged through the plurality of discharge ports 14. Specifically, first, the plurality of through holes 33 are staggered in the first cavity 31 so that the plurality of discharge ports 14 are closed, and the delivery pump works to fill the space of the first cavity 31 with metal powder. After this operation is completed, the motor 34 drives the column 32 to rotate one hundred and eighty degrees or other angles, so that the column 32 drives the plurality of through holes 33 to connect with the first cavity 31 and the plurality of discharge ports 14. In this state, the metal powder can maintain a consistent powder output at multiple points of the connector 13, making the powder output uniform, which is conducive to further precise coating and provides excellent prerequisites for subsequent work.

[0021] Optionally, the first cavity 31 includes a triangular cavity 311 and a cylindrical cavity 312; The triangular cavity 311 is connected to the cylindrical cavity 312 at the bottom, and the column 32 can rotate in the cylindrical cavity 312. Specifically, the center of the cylindrical cavity 312 is co-centric with the center of the column 32. The size of the cylindrical cavity 312 is limited to a size that allows the column 32 to rotate but not detach. After the powder fills the triangular cavity 311, it can be guided from top to bottom to the plurality of through holes 33, making the conduction and transportation of the powder more efficient.

[0022] Optionally, the scraper assembly 16 includes a first scraper 161 provided at the lower end of the connector 13, a second scraper 162 provided at the lower end of the connector 13, and a third scraper 163 provided at the lower end; The bottom surface of the first scraper 161 is higher than the bottom surface of the second scraper 162. Specifically, Optionally, the bottom surface of the second scraper 162 is an inclined surface, and the upper part of the inclined surface faces the first scraper 161, and the lower part of the inclined surface faces the third scraper 163; The first scraper 161, the second scraper 162 and the third scraper 163 can scrape the powder at different heights. Specifically, the first scraper 161 can move together with the connector 13 to scrape the metal powder at a height. After this action is completed, the second scraper 162 performs two rounds of scraping on the metal powder at the scraping height left by the first scraper 161. The inclined surface of the second scraper 162 has a buffering effect from small to large on the scraping process of the metal powder, avoiding the metal powder at a certain height from being lifted up by excessive scraping force, thereby ensuring the safety and stability of the scraping work. Afterwards, the third scraper 163 moves together with the connector 13 to perform two rounds of supplementary correction scraping on the scraping surface of the second scraper 162 to ensure the coverage of the scraping surface and improve the coating quality.

[0023] Optionally, the wind pushing portion 17 includes a second cavity 171 disposed in the connecting body 13, a fan 172 disposed inside the second cavity 171, and a third cavity 173 disposed on the first scraper 161 and connected to the second cavity 171; One end of the third cavity 173 is connected to a plurality of twisted oblique tubes 178; The opening of the twisted inclined tube 178 faces the discharge port 14. The fan 172 is driven, and the wind is discharged through the second cavity 171 and the third cavity 173 through the plurality of twisted inclined tubes 178, so that the wind pushes the powder to be spread horizontally. Specifically, the wind force generated by the fan 172 is guided by the second cavity 171 toward the third cavity 173 until it is ejected through the plurality of twisted inclined tubes 178. Since the metal powder discharged from the plurality of discharge ports 14 is linearly accumulated as the connector 13 moves, the plurality of twisted inclined tubes can blow the metal powder in this state, so that the linearly accumulated metal powder is spread in sequence to fill the gap between the two tracks, thereby providing good preconditions for the scraping work of the scraper group 16 and improving the scraping effect.

[0024] Optionally, the wind pushing portion 17 further includes a plurality of transverse tubes 174 penetrating and communicating with the second scraper 162 , a plurality of bent cavities 175 disposed on the second scraper 162 and vertically communicating with the plurality of transverse tubes 174 , and a plurality of first exhaust pipes 176 obliquely communicating with the plurality of bent cavities 175 , wherein; The wind is discharged through the third cavity 173, the plurality of transverse tubes 174, the plurality of bent cavities 175 and the plurality of first exhaust pipes 176, so that the wind pushes the powder to spread forward and backward. Specifically, when the wind passes through the third cavity 173, it can be diverted through the plurality of transverse tubes 174, and the diverted wind is discharged from the plurality of first exhaust pipes 176 through the plurality of bent cavities 175, so that the metal powder scraped by the first scraper 161 is affected by the wind from behind the first scraper 161 and is restricted from diffusing backward, thereby increasing the insurance effect during the metal powder scraping process, and effectively avoiding the situation where the metal powder sticks to the first scraper 161, making it easier for the metal powder to separate.

[0025] Optionally, the wind pushing portion 17 further includes a plurality of vertical pipes 177 connected to the lower ends of the plurality of horizontal pipes 174; The plurality of vertical tubes 177 are located between the second scraper 162 and the third scraper 163, and the bottom end surface of the vertical tube 177 is parallel to the bottom end surface of the second scraper 162. The wind can be discharged through the plurality of said horizontal tubes 174 and the plurality of said vertical tubes 177 so that the wind pushes the powder down to make it level. Specifically, the wind force can be diverted through the plurality of horizontal tubes 174 and diverted from the plurality of vertical tubes 177 toward the vertical direction to impact downward, so that the raised metal powder is pressed down by the wind curtain from above, and the metal powder is effectively prevented from being lifted up for a second time by the force, so that the metal powder is subjected to a variety of coordinated scraping measures to ensure high flatness.

[0026] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A laser 3D printer coating device, characterized in that: include: A movable powder sprinkling mechanism (1), the movable powder sprinkling mechanism (1) being slidably arranged at the upper end of the lifting powder chamber (2), and the movable powder sprinkling mechanism (1) being used for sprinkling powder into the lifting powder chamber (2), and the top surface of the lifting powder chamber (2) storing powder can be coplanar with the top surface thereof; The movable powder spreading mechanism (1) comprises two sliders (11) arranged in mirror image on both sides of the lifting powder storage chamber (2), two electric drive trolleys (12) slidably arranged on the two sliders (11), a connector (13) arranged at the top of the two electric drive trolleys (12), a plurality of discharge ports (14) arranged at the lower end of the connector (13), a delivery pump arranged in the connector (13), a telescopic hose (15) inserted through the connector (13) and connected to the input end of the delivery pump, a scraper group (16) arranged at the lower end of the connector (13), and a wind pushing part (17) arranged on the connector (13), wherein When the connecting body (13) slides radially, the plurality of discharge ports (14) can discharge powder material into the lifting powder chamber (2), and the wind pushing portion (17) can also trim the powder material spreading surface to be scraped flat by the scraper group (16).

2. A laser 3D printer coating device as claimed in claim 1, characterized in that: The laser 3D printer coating device further comprises a transition portion (3); The transition portion (3) comprises a first cavity (31) arranged in the connecting body (13), a column (32) rotatably arranged in the lower half of the first cavity (31), a plurality of through holes (33) arranged in a straight line on the column (32), and a motor (34) arranged at one end of the connecting body (13); The motor (34) has a motor (34) shaft connected to the column (32); The plurality of through holes (33) can be connected to the plurality of discharge ports (14), wherein By driving the motor (34), the column (32) can drive the plurality of through holes (33) to switch and connect with the plurality of discharge ports (14), so that the powder in the first cavity (31) is quantitatively discharged through the plurality of discharge ports (14).

3. A laser 3D printer coating device as claimed in claim 2, characterized in that: The first cavity (31) comprises a triangular cavity (311) and a cylindrical cavity (312); The triangular cavity (311) is connected to the cylindrical cavity (312) at the bottom, and the column (32) can rotate in the cylindrical cavity (312).

4. A laser 3D printer coating device as claimed in claim 3, characterized in that: The scraper group (16) comprises a first scraper (161) arranged at the lower end of the connecting body (13), a second scraper (162) arranged at the lower end of the connecting body (13), and a third scraper (163) arranged at the lower end; The bottom surface of the first scraper (161) is higher than the bottom surface of the second scraper (162).

5. A laser 3D printer coating device as claimed in claim 4, characterized in that: The bottom surface of the second scraper (162) is an inclined surface, with the upper part of the inclined surface facing the first scraper (161) and the lower part of the inclined surface facing the third scraper (163); The first scraper (161), the second scraper (162) and the third scraper (163) are capable of scraping powder at different heights.

6. A laser 3D printer coating device as claimed in claim 5, characterized in that: The wind pushing portion (17) comprises a second cavity (171) arranged in the connecting body (13), a fan (172) arranged inside the second cavity (171), and a third cavity (173) arranged on the first scraper (161) and connected to the second cavity (171); One end of the third cavity (173) is connected to a plurality of twisted oblique tubes (178); The opening of the twisted inclined tube (178) faces the discharge port (14), wherein The fan (172) is driven, and wind is discharged through the second cavity (171) and the third cavity (173) through the plurality of twisted inclined tubes (178), so that the wind pushes the powder to be spread horizontally.

7. A laser 3D printer coating device as claimed in claim 6, characterized in that: The wind pushing portion (17) further comprises a plurality of transverse tubes (174) penetrating and communicating with the second scraper (162), a plurality of bending cavities (175) arranged on the second scraper (162) and vertically communicating with the plurality of transverse tubes (174), and a plurality of first exhaust pipes (176) obliquely communicating with the plurality of bending cavities (175), wherein; The wind is discharged through the third cavity (173), the plurality of transverse tubes (174), the plurality of bending cavities (175) and the plurality of the first exhaust pipes (176), so that the wind pushes the powder to be spread forward and backward.

8. A laser 3D printer coating device as claimed in claim 7, characterized in that: The wind pushing portion (17) further comprises a plurality of vertical pipes (177) connected to the lower ends of the plurality of horizontal pipes (174); A plurality of vertical tubes (177) are disposed between the second scraper (162) and the third scraper (163), and the bottom end surface of the vertical tubes (177) is parallel to the bottom end surface of the second scraper (162), wherein The wind can be discharged through a plurality of the horizontal pipes (174) and a plurality of the vertical pipes (177) so that the wind pushes the powder down to a level surface.

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