3D printing bidirectional coating scraper mechanism

Abstract

The utility model discloses a 3D printing two-way coating scraper mechanism, and particularly relates to the technical field of 3D printing, the 3D printing two-way coating scraper mechanism comprises a fixing frame, a discharging barrel is arranged in the middle of the fixing frame, the bottom of the discharging barrel extends to the position below the fixing frame and is connected with a discharging triangular limiting shell, and a triangular prism block is arranged at the bottom of the discharging triangular limiting shell; and material guiding cavities are formed in the positions, located on the two sides of the triangular prism block, of the interior of the discharging triangular limiting shell, a material distributing block is fixedly arranged at the bottom of an inner cavity of the discharging barrel, material guiding holes are formed in the positions, close to the upper portions of the two material guiding cavities, of the interior of the material distributing block, and a rotating rod is inserted in the middle of the triangular prism block in the vertical direction. According to the utility model, materials in different material guide cavities can be conveniently distributed, so that control is carried out when one-way or two-way coating operation of the scrapers is needed, the coating thickness is conveniently adjusted, the damaged scrapers are rapidly switched, and shutdown operation is not needed when the damaged scrapers are disassembled and replaced.

Description

Technical Field

[0001] This utility model relates to the field of 3D printing technology, and more specifically, to a 3D printing bidirectional coating scraper mechanism. Background Technology

[0002] 3D printing technology, also known as additive manufacturing, is an emerging manufacturing technology that builds solid objects by depositing materials layer by layer. Unlike traditional subtractive manufacturing and equal-material manufacturing technologies, 3D printing technology does not require following the traditional processes of blanking, roughing, and finishing, nor does it rely on special forming molds. It has advantages such as design freedom, manufacturing flexibility, low cost, and short cycle time. In the 3D printing process, the coating squeegee mechanism plays a crucial role, especially in additive manufacturing technologies such as photopolymerization. The coating squeegee mechanism is responsible for spreading the printing materials such as liquid photosensitive resin evenly on the printing platform to ensure the printing quality of each layer.

[0003] A search revealed that Chinese patent CN218452599U discloses a bidirectional powder spreading scraper for 3D printing equipment. The scraper is designed with a cylinder, an inclined plate, a fixing block, and a scraper. The scrapers on both sides are positioned at different heights when the base is running in different directions. Therefore, only one scraper will spread powder during each operation of the base, which reduces wear on the scraper and increases its service life.

[0004] The aforementioned bidirectional toner-spreading scraper structure can also be applied to the design of bidirectional coating scrapers. However, in actual use, the scrapers on both sides of the bidirectional toner-spreading scraper structure need to work simultaneously. But if one scraper is damaged due to long-term use, the machine needs to be stopped for disassembly and replacement, which affects the normal use of the printer. Therefore, it is necessary to design a scraper mechanism that can quickly switch damaged scrapers without stopping the machine. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a 3D printing bidirectional coating scraper mechanism.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a 3D printing bidirectional coating scraper mechanism, including a fixed frame, a discharge cylinder arranged in the middle of the fixed frame, a discharge triangular limiting shell connected to the bottom of the discharge cylinder extending to the lower part of the fixed frame, a triangular prism block arranged at the bottom of the discharge triangular limiting shell, a guide cavity arranged on both sides of the triangular prism block inside the discharge triangular limiting shell, a dividing block fixedly arranged at the bottom of the inner cavity of the discharge cylinder, a guide hole arranged near the upper part of the two guide cavities inside the dividing block, a rotating rod inserted vertically in the middle of the triangular prism block, and a fixed connection at the top of the rotating rod. A baffle is installed at the bottom of the feed guide hole, and a rotating plate is fixedly connected to the bottom of the rotating rod below the triangular prism block. A locking bolt is connected between the rotating plate and the bottom of the triangular prism block. Cylinders are installed on both sides of the top of the fixed frame at the position of the discharge cylinder. The output ends of the two cylinders extend vertically downward to the bottom of the fixed frame. A limit cylinder is installed at the bottom of the fixed frame below the cylinders. A lifting rod is connected vertically to the inner side of the limit cylinder. The output end of the cylinder is fixedly connected to the top of the lifting rod. A lifting plate is fixedly connected to the bottom of the lifting rod below the limit cylinder. A scraper switching mechanism is installed at the bottom of the lifting plate.

[0007] As a further improvement to the technical solution of this utility model, the connection between the two ends of the rotating rod and the bottom of the baffle and the top of the rotating plate is welded, the interior of the triangular prism block is provided with a through hole for the rotating rod to pass through, and the baffle is a fan-shaped structure.

[0008] As a further improvement to the technical solution of this utility model, the bottom of the triangular prism block is provided with an internal threaded hole corresponding to the connection of the locking bolt, and the inside of the rotating plate is provided with four connecting holes in a ring at equal intervals corresponding to the connection of the locking bolt.

[0009] As a further improvement to the technical solution of this utility model, the cylinder is fixedly connected to the top of the fixed frame by bolts, the top of the limiting cylinder is fixedly connected to the bottom of the fixed frame by screws, and the bottom of the limiting cylinder is provided with a through hole for the extension and retraction of the lifting rod.

[0010] As a further improvement to the technical solution of this utility model, side plates are fixedly connected to the bottom of both ends of the fixed frame in the vertical direction. T-shaped blocks are provided at the ends of the two lifting plates near the inner sidewall of the side plates. T-shaped grooves are provided on the inner sidewall of the side plates in the vertical direction corresponding to the outer side of the T-shaped blocks.

[0011] As a further improvement to the technical solution of this utility model, the scraper switching mechanism includes a motor fixedly installed on the top of the lifting plate. The output end of the motor is vertically connected to a rotating shaft. A rotating block is fixedly connected to the bottom end of the rotating shaft. Scraper mounting plates are fixedly connected to both outer walls of the rotating block, and scrapers are connected to the outer walls of both scraper mounting plates.

[0012] As a further improvement to the technical solution of this utility model, the bottom of the lifting plate is connected to a bearing bracket outside the rotating shaft, and a fastening bolt is connected between the scraper and the scraper mounting plate. The scraper mounting plate has an internal threaded hole corresponding to the connection of the fastening bolt, and the scraper has an installation hole corresponding to the connection of the fastening bolt.

[0013] The beneficial effects of this utility model are:

[0014] 1. During use, the material is distributed through two guide holes on the distribution block, so that the material flowing into the two guide holes falls into the two guide cavities respectively, and then the coating operation is performed by the scrapers on both sides. By rotating the rotating plate, the rotating rod and the baffle can be rotated, which can cause the baffle to block one of the guide holes or not block both guide holes, so as to distribute the material in different guide cavities. This allows control when it is necessary to perform unidirectional or bidirectional scraper coating operation.

[0015] 2. The height of the scraper can be easily controlled by extending and retracting the cylinder, which facilitates the adjustment of the coating thickness. The scraper switching mechanism allows for quick switching of damaged scrapers during use. When a scraper is damaged after prolonged use, the working position can be quickly switched by starting the motor and rotating it to another ready-to-use scraper. This eliminates the need to stop the machine when disassembling and replacing damaged scrapers. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 For this utility model Figure 1 Enlarged view of section A.

[0018] Figure 3 For this utility model Figure 1 Enlarged view of section B.

[0019] Figure 4 This is a schematic diagram of the connection structure of the baffle in this utility model.

[0020] The attached diagram is labeled as follows: 1. Discharge cylinder; 2. Discharge triangular limiting shell; 3. Triangular prism block; 4. Guide cavity; 5. Dividing block; 6. Guide hole; 7. Baffle; 8. Rotating rod; 9. Rotating plate; 10. Locking bolt; 11. Fixing frame; 12. Cylinder; 13. Limiting cylinder; 14. Lifting rod; 15. Lifting plate; 16. Side plate; 17. Motor; 18. Rotating shaft; 19. Rotating block; 20. Scraper mounting plate; 21. Scraper; 22. Fastening bolt; 23. Bearing bracket; 24. T-shaped locking block; 25. T-shaped slide; 901. Connecting hole. Detailed Implementation

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

[0022] As attached Figure 1-4 The 3D printing bidirectional coating scraper mechanism shown includes a fixed frame 11, a discharge cylinder 1 in the middle of the fixed frame 11, a discharge triangular limiting shell 2 extending from the bottom of the discharge cylinder 1 to the bottom of the fixed frame 11, a triangular prism block 3 at the bottom of the discharge triangular limiting shell 2, and guide chambers 4 on both sides of the triangular prism block 3 inside the discharge triangular limiting shell 2. A material distribution block 5 is fixedly installed at the bottom of the inner cavity of the discharge cylinder 1, and guide holes 6 are provided inside the material distribution block 5 near the upper part of the two guide chambers 4. A rotating rod 8 is inserted vertically in the middle of the triangular prism block 3, and a baffle 7 blocking the bottom of the guide holes 6 is fixedly connected to the top of the rotating rod 8. A rotating plate 9 is fixedly connected to the bottom of the triangular prism block 3. A locking bolt 10 is connected between the rotating plate 9 and the bottom of the triangular prism block 3. Cylinders 12 are installed on both sides of the top of the fixed frame 11. The output ends of the two cylinders 12 extend vertically downward to the bottom of the fixed frame 11. A limiting cylinder 13 is installed at the bottom of the fixed frame 11 below the cylinders 12. A lifting rod 14 is connected vertically to the inner side of the limiting cylinder 13. The output end of the cylinder 12 is fixedly connected to the top of the lifting rod 14. A lifting plate 15 is fixedly connected to the bottom of the lifting rod 14 below the limiting cylinder 13. A scraper switching mechanism is installed at the bottom of the lifting plate 15.

[0023] As attached Figure 1-2 and attached Figure 4As shown, the connection between the two ends of the rotating rod 8 and the bottom of the baffle 7 and the top of the rotating plate 9 is welded. The interior of the triangular prism block 3 is provided with a through hole for the rotating rod 8 to pass through. The baffle 7 has a fan-shaped structure, and the bottom of the triangular prism block 3 is provided with an internal threaded hole corresponding to the connection of the locking bolt 10. The interior of the rotating plate 9 is provided with four connecting holes 901 arranged in a ring at equal intervals corresponding to the connection of the locking bolt 10. This facilitates the use of the material guide hole 6 on the material distribution block 5. By rotating the rotating plate 9, the rotating rod 8 and the baffle 7 can be rotated, which can cause the baffle 7 to block one of the material guide holes 6 or not block two of the material guide holes 6, thereby realizing the material distribution processing of the materials inside different material guide chambers 4.

[0024] As attached Figure 1 As shown, the cylinder 12 is fixedly connected to the top of the fixed frame 11 by bolts, and the top of the limiting cylinder 13 is fixedly connected to the bottom of the fixed frame 11 by screws. The bottom of the limiting cylinder 13 is provided with a through hole for the extension and retraction of the lifting rod 14, so as to control the extension and retraction of the lifting rod 14 in the vertical direction during use.

[0025] As attached Figure 1 and attached Figure 3 As shown, side plates 16 are fixedly connected to the bottom of both ends of the fixed frame 11 in the vertical direction. T-shaped blocks 24 are provided at the ends of the two lifting plates 15 near the inner side wall of the side plates 16. T-shaped grooves 25 are provided on the inner side wall of the side plates 16 in the vertical direction corresponding to the outer side of the T-shaped blocks 24, which facilitates the guiding and limiting function of the lifting plates 15 and improves the stability of the lifting plates 15 when lifting.

[0026] As attached Figure 1 and attached Figure 3 As shown, the scraper switching mechanism includes a motor 17 fixedly installed on the top of the lifting plate 15. The output end of the motor 17 is vertically connected to a rotating shaft 18. A rotating block 19 is fixedly connected to the bottom end of the rotating shaft 18. Scraper mounting plates 20 are fixedly connected to both outer walls of the rotating block 19. Scrapers 21 are connected to the outer walls of both scraper mounting plates 20. A bearing bracket 23 is connected to the bottom of the lifting plate 15 outside the rotating shaft 18. Fastening bolts 22 are connected between the scraper 21 and the scraper mounting plate 20. The scraper mounting plate 20 has an internal threaded hole corresponding to the connection of the fastening bolt 22. The scraper 21 has a mounting hole corresponding to the connection of the fastening bolt 22. The scraper switching mechanism facilitates quick switching of damaged scrapers 21 during use, so that there is no need to stop the machine when replacing damaged scrapers 21.

[0027] Working principle: This utility model designs a 3D printing bidirectional coating scraper mechanism, the specific structure of which is shown in the attached instruction manual. Figure 1-4As shown, in this technical solution, during the process of material falling from the discharge cylinder 1, it is divided by two guide holes 6 on the distribution block 5, so that the material flowing into the two guide holes 6 falls into the two guide cavities 4 respectively, and then the scrapers 21 on both sides perform the coating operation. By rotating the rotating plate 9, the rotating rod 8 and the baffle 7 are driven to rotate, which can drive the baffle 7 to block one of the guide holes 6 or not block both guide holes 6, so as to realize the material distribution processing in different guide cavities 4, thereby enabling the single-material distribution when needed. The coating operation of the doctor blade 21 is controlled in one or both directions; the height of the doctor blade 21 can be easily controlled by controlling the extension and retraction of the cylinder 12, which facilitates the adjustment of the coating thickness. By setting up a doctor blade switching mechanism, it is convenient to quickly switch the doctor blade 21 when it is damaged during use. When a doctor blade 21 is damaged after long-term use, the other doctor blade 21 can be switched to the working position by starting the motor 17 to rotate 180°, so that the doctor blade can be quickly switched without stopping the machine when disassembling and replacing the damaged doctor blade 21.

[0028] In the accompanying drawings of the embodiments disclosed in this utility model, only the structures involved in the embodiments of this utility model are shown. Other structures can be referred to with ordinary design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0029] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A 3D printing bidirectional coating scraper mechanism, comprising a fixed frame (11), wherein a discharge cylinder (1) is provided in the middle of the fixed frame (11), and a discharge triangular limiting shell (2) is connected to the bottom of the discharge cylinder (1) extending to the lower part of the fixed frame (11), characterized in that: The bottom of the discharge triangular limiting shell (2) is provided with a triangular prism block (3). The discharge triangular limiting shell (2) is provided with guide chambers (4) on both sides of the triangular prism block (3). The bottom of the inner cavity of the discharge cylinder (1) is fixedly provided with a material distribution block (5). The material distribution block (5) is provided with guide holes (6) at the upper position of the two guide chambers (4). A rotating rod (8) is inserted vertically in the middle of the triangular prism block (3). The top of the rotating rod (8) is fixedly connected with a baffle (7) that blocks the bottom of the guide hole (6). The bottom of the rotating rod (8) is fixedly connected with a rotating plate (9) below the triangular prism block (3). The rotating plate (9) and the triangular prism block (3) are fixedly connected. The bottom of the fixed frame (11) is connected by a locking bolt (10). The top of the fixed frame (11) is equipped with cylinders (12) on both sides of the discharge cylinder (1). The output ends of the two cylinders (12) extend vertically downward to the bottom of the fixed frame (11). The bottom of the fixed frame (11) is equipped with a limiting cylinder (13) below the cylinders (12). The inner side of the limiting cylinder (13) is connected with a lifting rod (14) in the vertical direction. The output end of the cylinder (12) is fixedly connected to the top of the lifting rod (14). The bottom end of the lifting rod (14) extends to the bottom of the limiting cylinder (13) and is fixedly connected with a lifting plate (15). The bottom of the lifting plate (15) is equipped with a scraper switching mechanism.

2. The 3D printing bidirectional coating scraper mechanism according to claim 1, characterized in that: The two ends of the rotating rod (8) are connected to the bottom of the baffle (7) and the top of the rotating plate (9) by welding. The triangular prism block (3) has a through hole for the rotating rod (8) to pass through. The baffle (7) has a fan-shaped structure.

3. The 3D printing bidirectional coating scraper mechanism according to claim 1, characterized in that: The bottom of the triangular prism block (3) is provided with an internal threaded hole corresponding to the connection of the locking bolt (10), and the inside of the rotating plate (9) is provided with four connecting holes (901) in a ring at equal intervals corresponding to the connection of the locking bolt (10).

4. The 3D printing bidirectional coating scraper mechanism according to claim 1, characterized in that: The cylinder (12) is fixedly connected to the top of the fixed frame (11) by bolts, and the top of the limiting cylinder (13) is fixedly connected to the bottom of the fixed frame (11) by screws. The bottom of the limiting cylinder (13) is provided with a through hole for the extension and retraction of the lifting rod (14).

5. The 3D printing bidirectional coating scraper mechanism according to claim 1, characterized in that: The bottom of both ends of the fixed frame (11) is fixedly connected with side plates (16) in the vertical direction. T-shaped blocks (24) are provided at the ends of the two lifting plates (15) near the inner side wall of the side plate (16). T-shaped grooves (25) are provided in the vertical direction on the inner side wall of the side plate (16) corresponding to the outer side of the T-shaped blocks (24).

6. The 3D printing bidirectional coating scraper mechanism according to claim 1, characterized in that: The scraper switching mechanism includes a motor (17) fixedly installed on the top of the lifting plate (15). The output end of the motor (17) is vertically connected to a rotating shaft (18). The bottom end of the rotating shaft (18) is fixedly connected to a rotating block (19). Both outer walls of the rotating block (19) are fixedly connected to scraper mounting plates (20). Both outer walls of the two scraper mounting plates (20) are connected to scrapers (21).

7. The 3D printing bidirectional coating scraper mechanism according to claim 6, characterized in that: The bottom of the lifting plate (15) is connected to the bearing bracket (23) outside the rotating shaft (18). The scraper (21) is connected to the scraper mounting plate (20) by a fastening bolt (22). The scraper mounting plate (20) has an internal threaded hole corresponding to the connection of the fastening bolt (22). The scraper (21) has an installation hole corresponding to the connection of the fastening bolt (22).

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