CN110899697A - Powder device is spread to metal powder for 3D metal printer - Google Patents
Powder device is spread to metal powder for 3D metal printer Download PDFInfo
- Publication number
- CN110899697A CN110899697A CN201911304421.2A CN201911304421A CN110899697A CN 110899697 A CN110899697 A CN 110899697A CN 201911304421 A CN201911304421 A CN 201911304421A CN 110899697 A CN110899697 A CN 110899697A
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- CN
- China
- Prior art keywords
- powder
- guide rail
- shell
- metal
- scraper
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/70—Recycling
- B22F10/73—Recycling of powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/22—Driving means
- B22F12/224—Driving means for motion along a direction within the plane of a layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/60—Planarisation devices; Compression devices
- B22F12/67—Blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/50—Means for feeding of material, e.g. heads
- B22F12/55—Two or more means for feeding material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a metal powder spreading device for a 3D metal printer, which comprises a carrying platform and a rack bottom plate. The utility model discloses a powder machine, including carrying platform, rack, frame bottom plate, rack, bracket. According to the invention, the auxiliary support guide mechanism consisting of the upright post and the guide rod is additionally arranged on the bottom plate of the machine frame, and the supporting arm is associated, so that the parallelism of the plane can be kept with the powder spreading of the forming cylinder, and the uniformity of the thickness of the powder layer is ensured to the greatest extent.
Description
Technical Field
The invention belongs to the technical field of 3D printing powder spreading, and particularly relates to a metal powder spreading device for a 3D metal printer.
Background
3D printing, which is one of the rapid prototyping technologies, is also called additive manufacturing, which is a technology for constructing an object by using an adhesive material such as powdered metal or plastic and the like, and by printing layer by layer, based on a digital model file. 3D printing is typically achieved using digital technology material printers. The method is often used for manufacturing models in the fields of mold manufacturing, industrial design and the like, and is gradually used for directly manufacturing some products, and parts printed by the technology are already available. The technology has applications in jewelry, footwear, industrial design, construction, engineering and construction (AEC), automotive, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms, and other fields.
The powder paving mechanism of the existing common 3D metal printer is generally a cantilever mechanism, and a lead screw drives a cantilever and a scraper to do reciprocating linear motion to complete powder paving action. The suspension arm is difficult to guarantee the parallelism of the powder spreading plane of the scraper and the forming cylinder, and the condition of deviation of the layering thickness can occur in the repeated reciprocating powder spreading action, so that the feeding is not directly influenced, certain hidden danger exists, and the stable proceeding of the subsequent printing work can not be ensured.
Disclosure of Invention
The invention aims to provide a metal powder spreading device for a 3D metal printer, wherein an auxiliary support guide mechanism consisting of a stand column and a guide rod is additionally arranged on a bottom plate of a rack, and a supporting arm is associated with the auxiliary support guide mechanism, so that the parallelism of a plane can be kept with the powder spreading of a forming cylinder, the evenness of the thickness of a powder layer is ensured to the maximum extent, and the problems in the prior art in the background art are solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a metal powder spreading device for a 3D metal printer comprises a carrying platform and a rack bottom plate, wherein a guide rail is mounted on the surface of the carrying platform, a rack is arranged and mounted on the surface of the guide rail, a driving mechanism is mounted on the guide rail, and a powder scraping mechanism is welded on the surface of one side of the driving mechanism;
the driving mechanism comprises a shell, a driving cavity is arranged on the upper half part inside the shell, a sliding groove is formed below the driving cavity of the shell, an open groove is formed in the surface of the shell between the driving cavity and the sliding groove, connecting rods are movably mounted on the inner walls of the two sides of the driving cavity through bearings, the surfaces of the connecting rods are connected with a transmission gear key through keys, one end of each connecting rod penetrates through the surface of the shell and is in transmission connection with the output end of the stepping motor through a coupler, the driving mechanism is movably connected with the guide rail through the sliding groove, and the top of the transmission gear penetrates through the open groove to be meshed with a rack arranged on;
the powder scraping mechanism comprises a supporting arm, a first scraper and a second scraper are sequentially arranged at the bottom of the supporting arm, one end of the supporting arm is welded on the surface of one side of the shell, a connecting plate is arranged at the other end of the supporting arm through a bolt, and a linear bearing is arranged on the surface of the connecting plate;
the surface of the frame bottom plate is provided with a forming cylinder, two stand columns are welded on one side of the forming cylinder of the frame bottom plate, a guide rod is welded between the two stand columns, and the guide rod is connected with a linear bearing arranged on one side of the supporting arm in a sliding mode.
Preferably, the first scraper and the second scraper are all integrated structures made of T12A high-carbon tool steel, and the distance between the first scraper and the second scraper is at least 5 cm.
Preferably, the powder supply cylinders are respectively arranged on the two sides of the forming cylinder of the frame bottom plate, the powder overflow cylinders are respectively arranged on one sides of the two powder supply cylinders, and the two powder supply cylinders and the two powder overflow cylinders are symmetrically arranged on the surface of the frame bottom plate.
Preferably, the surfaces of the two sides of the guide rail are provided with grooves, the inner walls of the two sides of the sliding groove arranged below the shell are respectively provided with a convex end, and the grooves arranged on the guide rail are in contact with and limited by the convex ends arranged on the sliding groove.
Preferably, the surface welding of one side of shell has two at least mounting brackets, the mounting bracket passes through bolt cooperation and one side fixed connection of step motor, just step motor's terminal box is in between two mounting brackets.
Preferably, one end of the bracket arm is welded on the lower half part of the surface of one side of the shell, the height of the bracket arm is the same as that of the upright column, and the bracket arm is arranged at a horizontal angle between the guide rod and the shell.
Preferably, the length of the guide rail is the same as that of the bottom plate of the rack, the two ends of the guide rail of the carrying platform are respectively provided with a fixed table, and the two ends of the guide rail are respectively fixedly connected with one side of the two fixed tables through screws.
Preferably, the surface of the connecting plate is provided with at least four mounting holes, and the thickness of the connecting plate is 1-2 cm.
The invention has the technical effects and advantages that: compared with the prior art, the metal powder spreading device for the 3D metal printer has the following advantages:
1. according to the invention, the stand column and the guide rod are additionally arranged on the bottom plate of the rack, one end of the support arm is associated with the guide rod through the connection plate and the linear bearing, so that the guide rod plays a certain auxiliary supporting role in the process of driving the support arm to move back and forth to spread powder, the stability of the support arm and the installed scraper is further stabilized, the parallelism of the support arm and the powder spreading of the forming cylinder can be kept, the thickness uniformity of the powder layer is ensured to the maximum extent, and the subsequent printing work is powerfully guaranteed.
2. The interval is 5cm at least between first scraper of setting on the trailing arm and the second scraper, makes two scrapers of trailing arm in the removal process can fully strickle the metal powder respectively through this structure, and the scraper of second process is as supplementary strickle the effect, avoids spreading the powder inequality.
3. When the driving mechanism is installed, the groove arranged on the guide rail is in contact with the protruding end arranged on the sliding groove, the limiting effect is achieved through the structure, the installing position of the driving mechanism can be stable, slight vibration is avoided when the driving mechanism moves, and adverse effects caused by powder spreading action are avoided.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the driving mechanism and the rail mounting structure of the present invention;
FIG. 3 is a schematic structural diagram of a powder scraping mechanism according to the present invention;
FIG. 4 is a schematic view of the connecting plate and linear bearing structure of the present invention;
fig. 5 is a schematic structural diagram of the installation position of the powder scraping mechanism of the invention.
In the figure: 1. a mounting platform; 2. a fixed table; 3. a guide rail; 31. a rack; 32. a groove; 4. a drive mechanism; 41. a housing; 42. a drive chamber; 43. a connecting rod; 44. a transmission gear; 45. a chute; 46. a raised end; 47. a stepping motor; 48. a mounting frame; 5. a powder scraping mechanism; 51. a bracket arm; 52. a first scraper; 53. a second scraper; 6. a connecting plate; 7. a linear bearing; 8. a column; 9. a guide bar; 10. a chassis base plate; 11. a forming cylinder; 12. a powder supply cylinder; 13. powder overflow cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a metal powder spreading device for a 3D metal printer, which comprises a carrying platform 1 and a rack bottom plate 10, wherein a guide rail 3 is arranged on the surface of the carrying platform 1, a rack 31 is arranged and installed on the surface of the guide rail 3, a driving mechanism 4 is assembled on the guide rail 3, and a powder scraping mechanism 5 is welded on the surface of one side of the driving mechanism 4;
the driving mechanism 4 comprises a shell 41, a driving cavity 42 is arranged at the upper half part inside the shell 41, a sliding groove 45 is arranged below the driving cavity 42 of the shell 41, an open slot is arranged on the surface of the shell 41 between the driving cavity 42 and the sliding groove 45, a connecting rod 43 is movably arranged on the inner walls of two sides of the driving cavity 42 through a bearing, the surface of the connecting rod 43 is connected with a transmission gear 44 through a key, one end of the connecting rod 43 penetrates through the surface of the shell 41 and is in transmission connection with the output end of a stepping motor 47 through a coupler, at least two mounting frames 48 are welded on the surface of one side of the shell 41, the mounting frames 48 are fixedly connected with one side of the stepping motor 47 through bolt matching, a junction box of the stepping motor 47 is positioned between the two mounting frames 48, the position of the stepping motor 47 is limited through the matching of the mounting frames 48, so, certain protection can be provided for the junction box and the wiring, and the circuit winding is avoided; the driving mechanism 4 is movably connected with the guide rail 3 through a chute 45, and the top of the transmission gear 44 penetrates through the open slot to be meshed with the rack 31 arranged on the guide rail 3; the both sides surface of guide rail 3 has all seted up recess 32, be equipped with protruding end 46 on the 45 both sides inner walls of spout that set up in shell 41 below respectively, the recess 32 that sets up on guide rail 3 contacts and is spacing with the protruding end 46 that sets up on spout 45, play spacing effect through this kind of structure, can make actuating mechanism 4's mounted position obtain stabilizing, avoid taking place slight vibrations when actuating mechanism 4 removes simultaneously, avoid causing adverse effect to the shop's powder action.
Scrape powder mechanism 5 and include trailing arm 51, first scraper 52 and second scraper 53 are installed according to this to the bottom of trailing arm 51, the one end welding of trailing arm 51 is on the surface of shell 41 one side, connecting plate 6 is installed through the bolt to the other end of trailing arm 51, the surface mounting of connecting plate 6 has linear bearing 7, four mounting holes have been seted up on the surface of connecting plate 6 at least, the thickness of connecting plate 6 is 1 ~ 2cm, can play effective supporting effect, make the one end of trailing arm 51 can utilize connecting plate 6 to come to carry out effective association with guide arm 9 part, avoid appearing horizontal angle's deviation, so that influence shop's powder thickness.
The first scraper 52 and the second scraper 53 are all integrated structures made of T12A high-carbon tool steel, the distance between the first scraper 52 and the second scraper 53 is at least 5cm, the T12A carbon tool steel is hypereutectoid steel, and due to high carbon content, relatively large excess carbides are still left after quenching, so that the high-carbon hypereutectoid steel has the advantages of good machinability, low price, easy source and good strength and rigidity, can effectively strike and lay metal powder and avoid scratches on the surface; and the interval between first scraper 52 and the second scraper 53 is 5cm at least, makes two scrapers of trailing arm 51 in the removal process can fully scrape the metal powder respectively through this structure, and the scraper of second process is as supplementary strickle the effect, avoids spreading the powder inequality.
The surface of frame bottom plate 10 is equipped with shaping jar 11, frame bottom plate 10 has two stands 8 in the welding of shaping jar 11 one side, the welding has guide arm 9 between two stands 8, guide arm 9 and the linear bearing 7 sliding connection who sets up in bracket 51 one side, the latter half on shell 41 one side surface is welded to bracket 51's one end, bracket 51's height is the same with stand 8, and bracket 51 is the horizontal angle setting between guide arm 9 and shell 41, make bracket 51 can keep horizontal position, and then guarantee scraper and 11 powder paving planar depth of parallelism of shaping jar, and then ensure the thick uniformity of powder paving layer.
Working principle or structural principle: drive connecting rod 43 and drive gear 44 through step motor 47 and rotate for drive gear 44 moves on rack 31, and then drives actuating mechanism 4 and wholly moves along guide rail 3, and actuating mechanism 4 when the installation, will set up recess 32 on guide rail 3 and the protruding end contact of setting on spout 45, play spacing effect through this kind of structure, can avoid taking place slight vibrations when actuating mechanism 4 removes, avoid causing adverse effect to the shop's powder action.
The powder scraping mechanism 5 is fixedly installed on one side of the shell 41 in the driving mechanism 4 through the supporting arm 51 and moves along with the supporting arm, and the other end of the supporting arm 51 is movably connected to the guide rod 9 through the connecting plate 6 and the linear bearing 7 in a matched mode, so that the supporting arm 51 can keep a horizontal position, the parallelism of a powder spreading plane of the scraper and the forming cylinder 11 is further guaranteed, and the consistency of the thickness of the powder spreading layer is further guaranteed.
The driving mechanism 4 drives the supporting arm 51 to reciprocate, so that powder spreading action is performed through the first scraper 52 and the second scraper 53, the supporting arm 51 is supported by the guide rod 9, the stability of the supporting arm 51 and the installed scrapers is stabilized in this way, the parallelism of the powder spreading and maintaining plane of the forming cylinder 11 is ensured, the uniformity of the thickness of the powder layer is ensured to the maximum extent, and powerful guarantee is provided for subsequent printing work.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (8)
1. A metal powder spreading device for a 3D metal printer comprises a carrying platform (1) and a rack bottom plate (10), wherein a guide rail (3) is mounted on the surface of the carrying platform (1), a rack (31) is arranged and mounted on the surface of the guide rail (3), a driving mechanism (4) is mounted on the guide rail (3), and a powder scraping mechanism (5) is welded on the surface of one side of the driving mechanism (4);
the driving mechanism (4) comprises a shell (41), a driving cavity (42) is arranged at the upper half part of the inside of the shell (41), a sliding groove (45) is arranged below the driving cavity (42) of the shell (41), and an open slot is arranged on the surface of the shell (41) between the driving cavity (42) and the sliding groove (45), the inner walls of the two sides of the driving cavity (42) are movably provided with a connecting rod (43) through a bearing, the surface of the connecting rod (43) is connected with the transmission gear (44) by a key, one end of the connecting rod (43) passes through the surface of the shell (41) and is in transmission connection with the output end of the stepping motor (47) through a coupler, the driving mechanism (4) is movably connected with the guide rail (3) through a chute (45), the top of the transmission gear (44) penetrates through the open slot to be meshed with a rack (31) arranged on the guide rail (3);
the powder scraping mechanism (5) comprises a supporting arm (51), a first scraper (52) and a second scraper (53) are sequentially arranged at the bottom of the supporting arm (51), one end of the supporting arm (51) is welded on the surface of one side of the shell (41), a connecting plate (6) is arranged at the other end of the supporting arm (51) through a bolt, and a linear bearing (7) is arranged on the surface of the connecting plate (6);
the surface of frame bottom plate (10) is equipped with forming cylinder (11), frame bottom plate (10) have two stands (8) in forming cylinder (11) one side welding, two welding has guide arm (9) between stand (8), guide arm (9) and the linear bearing (7) sliding connection who sets up in trailing arm (51) one side.
2. The metal powder spreading device for the 3D metal printer according to claim 1, wherein: the first scraper (52) and the second scraper (53) are all integrated structures made of T12A high-carbon tool steel, and the distance between the first scraper (52) and the second scraper (53) is at least 5 cm.
3. The metal powder spreading device for the 3D metal printer according to claim 1, wherein: the powder feeding device is characterized in that powder feeding cylinders (12) are respectively arranged on two sides of a forming cylinder (11) of the frame bottom plate (10), powder overflowing cylinders (13) are respectively arranged on one sides of the two powder feeding cylinders (12), and the two powder feeding cylinders (12) and the two powder overflowing cylinders (13) are symmetrically arranged on the surface of the frame bottom plate (10).
4. The metal powder spreading device for the 3D metal printer according to claim 1, wherein: the guide rail structure is characterized in that the surfaces of two sides of the guide rail (3) are respectively provided with a groove (32), the inner walls of two sides of a sliding groove (45) arranged below the shell (41) are respectively provided with a convex end (46), and the groove (32) arranged on the guide rail (3) is in contact with and limited by the convex end (46) arranged on the sliding groove (45).
5. The metal powder spreading device for the 3D metal printer according to claim 1, wherein: the surface welding of one side of shell (41) has two at least mounting brackets (48), mounting bracket (48) pass through bolt cooperation and one side fixed connection of step motor (47), just the terminal box of step motor (47) is in between two mounting brackets (48).
6. The metal powder spreading device for the 3D metal printer according to claim 1, wherein: one end of the bracket arm (51) is welded on the lower half portion of the surface of one side of the shell (41), the height of the bracket arm (51) is the same as that of the upright column (8), and the bracket arm (51) is arranged between the guide rod (9) and the shell (41) at a horizontal angle.
7. The metal powder spreading device for the 3D metal printer according to claim 1, wherein: the length of guide rail (3) is the same with the length of frame bottom plate (10), just mounting platform (1) is equipped with fixed station (2) respectively at the both ends of guide rail (3), the both ends of guide rail (3) are respectively through one side fixed connection of screw and two fixed stations (2).
8. The metal powder spreading device for the 3D metal printer according to claim 1, wherein: the surface of the connecting plate (6) is at least provided with four mounting holes, and the thickness of the connecting plate (6) is 1-2 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911304421.2A CN110899697A (en) | 2019-12-17 | 2019-12-17 | Powder device is spread to metal powder for 3D metal printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911304421.2A CN110899697A (en) | 2019-12-17 | 2019-12-17 | Powder device is spread to metal powder for 3D metal printer |
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| Publication Number | Publication Date |
|---|---|
| CN110899697A true CN110899697A (en) | 2020-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911304421.2A Pending CN110899697A (en) | 2019-12-17 | 2019-12-17 | Powder device is spread to metal powder for 3D metal printer |
Country Status (1)
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| CN (1) | CN110899697A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112520448A (en) * | 2020-11-30 | 2021-03-19 | 嘉兴维恩机械有限公司 | Automatic powder laying device for self-lubricating bearing |
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| CN208033663U (en) * | 2018-04-13 | 2018-11-02 | 东北林业大学 | A kind of continuous powder feeder unit of Selective Laser Sintering |
| CN110181054A (en) * | 2019-07-01 | 2019-08-30 | 广州大学 | A kind of power spreading device for SLM type metal 3D printer |
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2019
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| CN203470903U (en) * | 2013-07-31 | 2014-03-12 | 济南大学 | Quick forming powder spreading device |
| US20170050261A1 (en) * | 2015-03-31 | 2017-02-23 | Yuanmeng Precision Technology (Shenzhen) Institute | Electron beam melting and cutting composite 3d printing apparatus |
| CN205836007U (en) * | 2015-10-19 | 2016-12-28 | 徐小娟 | A kind of 3D printer tiling powder feeding mobile device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112520448A (en) * | 2020-11-30 | 2021-03-19 | 嘉兴维恩机械有限公司 | Automatic powder laying device for self-lubricating bearing |
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