CN115179548A - A dynamic powder spreading system for additive manufacturing - Google Patents

Abstract

The invention provides an additive manufacturing dynamic powder laying system which comprises a rack and a forming platform, wherein the rack is positioned right above the forming platform, a lead screw and a sliding rod are respectively installed on the rack, two ends of the lead screw are rotatably connected with a first fixed seat, the lead screw penetrates through a first flat plate and is rotatably connected with the first flat plate, one end of the lead screw penetrates through the first fixed seat and is connected with a first driving motor, two ends of the sliding rod are fixedly connected with a second fixed seat, the sliding rod penetrates through a second flat plate and is slidably connected with the second flat plate, and a scraper, a powder laying roller and a powder supply box are sequentially and fixedly installed on the bottom surface of the second flat plate from left to right. According to the invention, the powder falls into the lower opening of the powder supply box through the stirring device, the cleaning device and the blowing device, so that the waste of the powder is avoided; the scraper, the powder spreading roller and the powder supply box are sequentially arranged on the bottom surface of the second flat plate from left to right, so that the powder falling, powder spreading and scraping can be completed at one time, and the operation is convenient and fast.

Description

A dynamic powder spreading system for additive manufacturing

technical field

The invention relates to the technical field of additive manufacturing equipment, in particular to a dynamic powder spreading system for additive manufacturing.

Background technique

There are many process methods for additive manufacturing, which are mainly divided into manufacturing methods based on powder feeding methods and powder spreading methods. The manufacturing method based on the powder spreading method includes the selective laser melting forming (SLM) method. The processing process is as follows: first design the three-dimensional solid model of the part on the computer, and then slice and layer the three-dimensional model through the slicing software to obtain The profile data of each section is imported into the additive manufacturing equipment. The powder spreading device lays a layer of powder on the surface of the forming platform according to the predetermined thickness of the powder layer. into three-dimensional parts.

For example, the application publication number is CN114311667A for a continuous powder supply and powder spreading system and its additive manufacturing method. The system adds powder material to the powder storage box, and the powder material enters the vertical feeding structure under the action of gravity. The vertical feeding structure The powder material is fed into the transfer structure, and the transfer structure lays the powder material on the bottom of the molding chamber, which can realize continuous powder supply and powder spreading, and can effectively solve the falling powder supply of the powder storage box and the rising powder supply cylinder. The problems of clogging the nozzle and the limited molding size of the powder supply are conducive to the application of powder additive manufacturing methods in large-scale structures.

However, there are still the following shortcomings: from the above statement, the powder in the temporary storage bin of the system may affect the uniformity of powder spreading due to agglomeration that has not been used for a long time. If the powder is scattered, it may cause powder to adhere to the stirring device, resulting in waste of powder.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a dynamic powder spreading system for additive manufacturing which can not only agglomerate the powder to spread the powder evenly, but also remove the powder adhering to the mixing device and avoid the waste of powder, so as to solve the above problems. Issues raised in the background art.

To achieve the above object, the present invention provides the following technical solutions:

A dynamic powder spreading system for additive manufacturing, comprising a frame and a forming platform, the frame is located directly above the forming platform, a lead screw and a sliding rod are respectively installed on the frame, and two parts of the lead screw are respectively installed. A first fixing seat is rotatably connected to the end, the lead screw penetrates through the first plate, and is rotatably connected to the first plate, and one end of the lead screw penetrates the first fixing seat and is connected to the first drive motor, and the sliding rod The two ends are fixedly connected with a second fixing seat, the sliding rod penetrates through the second flat plate, and is slidably connected with the second flat plate, and the bottom surface of the second flat plate is fixedly installed with a scraper, a powder spreading roller and a supply roller in sequence from left to right. Powder box, a powder inlet port is opened on the side of the powder supply box, a powder outlet port is opened at the bottom end of the powder supply box, and a powder inlet pipe is connected to the powder inlet port, and the other end of the powder inlet pipe is It is connected with the powder outlet of the powder feeding hopper. The powder supply box is provided with a stirring device for breaking up the agglomerated powder. The stirring device includes a first rotating shaft and is fixedly connected to the first rotating shaft at equal intervals. The first rotating blades on both sides of the shaft, the first rotating shaft penetrates through the top of the powder supply box and is connected to the first central shaft of the second driving motor, and the first central shaft is also fixedly connected with a first transmission gear , the side surface of the first transmission gear is meshed with the second transmission gear.

Preferably, a cleaning device for removing powder adhering to the first rotating blade is connected to the second transmission gear.

Preferably, the cleaning device includes a second rotating shaft, a second central shaft, a second rotating blade and a first brush, the second rotating shaft and the second central shaft on the second transmission gear are fixedly connected, The second rotating blades are fixedly connected on both sides of the second rotating shaft at equal intervals, and the first brushes are mounted on the second rotating blades.

Preferably, the side surface of the second transmission gear is meshed with the third transmission gear, and the third transmission gear is connected with an air blowing device for removing the powder adhering to the first brush.

Preferably, the air blowing device includes a second rotating shaft, a third central shaft, a third rotating blade and a trachea, the second rotating shaft is fixedly connected to the third central shaft on the third transmission gear, and the The third rotating blades are fixedly connected on both sides of the second rotating shaft at equal intervals, air slits are opened on the third rotating blades, the air pipe is fixed inside the second rotating shaft through a bearing, and one end of the air pipe penetrates through The third transmission gear is connected to the air pump, and the air pipe is provided with an air hole at a position relative to the third rotating blade.

Preferably, the powder spreading roller is movably mounted on the second flat plate through a first mounting bracket, and a third driving motor for driving the fourth transmission gear is installed on the second flat plate through the second mounting bracket. The fourth transmission gear and the fifth transmission gear are meshed and connected for driving the rotation of the powder spreading roller.

Preferably, a second brush is installed between the scraper and the powder spreading roller, and the second brush is used to clean the powder adhering to the powder spreading roller.

Preferably, a powder storage cavity for storing powder is provided between the powder feed pipe and the powder feed hopper, and a control valve for controlling the powder flow is provided on the powder feed pipe.

Compared with the prior art, the beneficial effects of the present invention are:

The present invention drives the first transmission gear to rotate through the activation of the second driving motor, and the rotation of the first transmission gear can drive the reverse rotation of the second transmission gear. Through the opposite rotation directions of the first transmission gear and the second transmission gear, The first brush on the first rotating blade and the second rotating blade can be brought into contact to clean the powder adhering to the first rotating blade, and the rotation of the second transmission gear can drive the reverse rotation of the third transmission gear. The opposite rotation direction of the second transmission gear and the third transmission gear can make the gas circulating on the third rotating blade blow off the powder adhered to the first brush, and the powder can pass through the powder outlet through the stirring device, the cleaning device and the air blowing device. The mouths fall into the lower mouth of the powder supply box to avoid waste of powder; by installing the scraper, powder spreading roller and powder supply box on the bottom surface of the second flat plate from left to right, powder falling and powder spreading can be completed at one time. And the work of scraping is convenient and fast; the powder storage chamber can store a large amount of powder at one time for the multi-layer powder coating of the product, saving the time of adding powder, and using the control valve to set the required amount of powder for laying a layer of powder. amount, saving time in recycling excess powder.

Description of drawings

Fig. 1 is the structural representation when the present invention is not spread powder;

Fig. 2 is the structural representation after powder spreading of the present invention;

Fig. 3 is the structural bottom view of the first flat plate and the second flat plate of the present invention;

Fig. 4 is the left side view of the structure of the first flat plate and the second flat plate of the present invention;

5 is a schematic structural diagram of a stirring device, a cleaning device and an air blowing device of the present invention;

6 is an enlarged view of the structure of the stirring device, the cleaning device and the air blowing device of the present invention;

FIG. 7 is a schematic structural diagram of a scraper, a powder spreading roller and a powder supply box according to the present invention.

In the figure: 1 frame, 2 forming platform, 3 lead screw, 4 sliding rod, 5 first fixed seat, 6 first flat plate, 7 first drive motor, 8 second fixed seat, 9 second flat plate, 10 scraper, 11 powder spreading roller, 12 powder supply box, 13 powder inlet, 14 powder inlet pipe, 15 powder inlet hopper, 16 stirring device, 17 first rotating shaft, 18 first rotating blade, 19 second driving motor, 20 first Central shaft, 21 first transmission gear, 22 second transmission gear, 23 cleaning device, 24 second rotating shaft, 25 second central shaft, 26 second rotating blade, 27 first brush, 28 third transmission gear, 29 Air blowing device, 30 second rotating shaft, 31 third central shaft, 32 third rotating blade, 33 air pipe, 34 air slot, 35 bearing, 36 air pump, 37 air hole, 38 first installation bracket, 39 second installation bracket, 40 Fourth transmission gear, 41 third drive motor, 42 fifth transmission gear, 43 second brush, 44 powder storage chamber, 45 control valve, 46 powder outlet.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example:

Please refer to FIG. 1 to FIG. 7, the present invention provides a technical solution:

A dynamic powder spreading system for additive manufacturing, as shown in Figures 1 and 2, includes a frame 1 and a forming platform 2, the frame 1 is located directly above the forming platform 2, and the lead screws 3 and 2 are respectively installed on the frame 1. The sliding rod 4, the two ends of the lead screw 3 are rotatably connected with the first fixed seat 5, the lead screw 3 penetrates the first plate 6, and is rotatably connected with the first plate 6, and one end of the lead screw 3 penetrates the first fixed seat 5 and the first plate 6. A drive motor 7 is connected, the two ends of the sliding rod 4 are fixedly connected with a second fixing seat 8, the sliding rod 4 penetrates the second flat plate 9, and is slidably connected with the second flat plate 9, the bottom surface of the second flat plate 9 is sequentially from left to right The scraper 10, the powder spreading roller 11 and the powder supply box 12 are fixedly installed; as shown in Figure 7, a second brush 43 is installed between the scraper 10 and the powder spreading roller 11, and the second brush 43 is used to clean the powder spreading roller The powder adhered on the 11, the powder spreading roller 11 is movably installed on the second flat plate 9 through the first mounting bracket 38, and the second flat plate 9 is installed with a third drive for driving the fourth transmission gear 40 through the second mounting bracket 39. The motor 41, the fourth transmission gear 40 and the fifth transmission gear 42 are meshed and connected to drive the rotation of the powder spreading roller 11; as shown in FIG. The bottom end of 12 is provided with a powder outlet 46, and the powder inlet 13 is connected with a powder inlet pipe 14. The powder inlet pipe 14 is set in a way of being low on the left and high on the right, so that the powder can flow into the inside of the powder supply box 12 better. The other end of the powder inlet pipe 14 is connected to the powder outlet of the powder inlet hopper 15. A powder storage cavity 44 for storing powder is arranged between the powder inlet pipe 14 and the powder inlet hopper 15. The powder inlet pipe 14 is provided with a powder storage chamber 44 for controlling the powder. The flow control valve 45, the powder supply box 12 is provided with a stirring device 16 for breaking up the agglomerated powder. A rotating blade 18, the first rotating shaft 17 penetrates through the top of the powder supply box 12 and is connected to the first central shaft 20 of the second driving motor 19. The first central shaft 20 is also fixedly connected with a first transmission gear 21. The first transmission The side surface of the gear 21 is meshed with the second transmission gear 22 .

As shown in FIGS. 5 and 6 , the second transmission gear 22 is connected with a cleaning device 23 for removing the powder adhering to the first rotating blade 18 . The cleaning device 23 includes a second rotating shaft 24 , a second central shaft 25 and The second rotating blade 26 , the first brush 27 , the second rotating shaft 24 are fixedly connected to the second central shaft 25 on the second transmission gear 22 , and the second rotating blade 26 is fixedly connected to two sides of the second rotating shaft 24 at equal intervals. On the side, the first brush 27 is mounted on the second rotating blade 26 .

As shown in FIG. 5 and FIG. 6 , the side surface of the second transmission gear 22 is meshed with the third transmission gear 28 , and the third transmission gear 28 is connected with a blowing device 29 for removing the powder adhering to the first brush 27 . , the blowing device 29 includes a second rotating shaft 30, a third central shaft 31, a third rotating blade 32 and an air pipe 33, the second rotating shaft 30 and the third central shaft 31 on the third transmission gear 28 are fixedly connected, and the third The rotating blades 32 are fixedly connected on both sides of the second rotating shaft 30 at equal intervals, the third rotating blade 32 is provided with air slits 34, the air pipe 33 is fixed inside the second rotating shaft 30 through the bearing 35, and one end of the air pipe 33 penetrates the third rotating shaft 30. The transmission gear 28 is connected to the air pump 36 , and an air hole 37 is formed on the air pipe 33 at a position relative to the third rotating blade 32 .

In the present invention, the scraper 10, the powder spreading roller 11 and the powder supply box 12 are sequentially installed from left to right, so as to provide a complete working process of powder falling, powder spreading and scraping. The specific process is: start the first drive motor 7 The rotation of the rear drive screw 3 drives the second flat plate 9 to slide to the right. The powder can be dropped on the product on the forming platform 2 through the powder supply box 12, and the powder of the product on the forming platform 2 can be dropped by the powder spreading roller 11. Flattening, and the scraper 10 can scrape the powder with inconsistent powder thickness, and through the joint action of the scraper 10 and the powder spreading roller 11, the powder spreading is more uniform, flat and compact.

In the present invention, the first rotating blade 18 , the second rotating blade 26 and the third rotating blade 32 are all anti-static bars, which can prevent the first rotating blade 18 , the second rotating blade 26 and the third rotating blade 32 Adhesive powder.

In the present invention, the forming platform 2 is located in the lower middle of the frame 1, and the length of the sliding rod 4 is such that the powder supply box 12 can slide to the left edge of the forming platform 2 and the scraper 10 can slide to the right edge of the forming platform 2, so that the forming The product on platform 2 is fully covered with powder from left to right.

In the present invention, the powder storage chamber 44 can be used to store a large amount of powder at one time for multi-layer powder coating of the product, which saves the time for adding powder, and the control valve 45 can be used to set the amount required for laying a layer of powder, eliminating the need for recycling Time for excess powder.

In the present invention, the second drive motor 19 is activated to drive the first transmission gear 21 to rotate, and the rotation of the first transmission gear 21 can drive the reverse rotation of the second transmission gear 22, and the rotation of the second transmission gear 22 can The reverse rotation of the third transmission gear 28 is driven, and the rotation directions of the first transmission gear 21 and the second transmission gear 22 are opposite, so that the first brush 27 on the first rotating blade 18 and the second rotating blade 26 can be brought into contact, In order to clean the powder adhering to the first rotating blade 18, the second transmission gear 22 and the third transmission gear 28 rotate in opposite directions, so that the gas circulating on the third rotating blade 32 can be blown off the first brush 27 and adhered. The powder will fall into the lower opening of the powder supply box 12 through the stirring device 16, the cleaning device 23 and the blowing device 29, so as to avoid the waste of powder.

The working principle of the additive manufacturing dynamic powder spreading system is as follows:

First, the first rotating blade 18 is driven to rotate by starting the second driving motor 19. Under the meshing transmission of the first transmission gear 21 and the second transmission gear 22, the second rotating blade 26 is driven to rotate. The transmission gear 28 drives the third rotating blade 32 to rotate under the action of the meshing transmission. At the same time, the air pump 36 is started to pass the gas into the third rotating blade 32 through the air pipe 33 and the air hole 37, and then the first driving motor 7 is started, The rightward movement of the lead screw 3 drives the second flat plate 9 to move to the right, and the second flat plate 9 moves to the right to drive the scraper 10, the powder spreading roller 11 and the powder supply box 12 to move to the right, and the powder supply box 12 moves from the left edge of the forming platform 2 to the right. In the process of moving to its right edge, a layer of powder is poured into the powder supply box 12 through the control valve 45 through the powder inlet 13 and the powder inlet pipe 14, and the agglomerated powder is broken up by the first rotating blade 18. , because the rotating directions of the second rotating blade 26 and the first rotating blade 18 are opposite, the first brush 27 can remove the powder on the first rotating blade 18, because the rotating directions of the third rotating blade 32 and the second rotating blade 26 are opposite , the gas inside the third rotating blade 32 is blown onto the first brush 27 through the air slot 34, which can remove the powder of the first brush 27. Under the combined action of the cleaning device 23 and the blowing device 29, the supply The powder in the powder box 12 falls on the product on the forming platform 2 through the powder outlet 46. While the powder is falling from the powder supply box 12, the powder spreading roller 11 behind it is driven by the third drive motor 41 and the fourth transmission gear. Driven by 40, the powder that just fell in front is flattened and compacted. At the same time, the scraper 10 behind the powder spreading roller 11 can scrape the flattened and compacted powder. And the powder supply box 12 is sequentially installed on the bottom surface of the second flat plate 9 from left to right, so that powder dropping, powder spreading and leveling can be completed at one time, which is convenient and fast.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. A dynamic powder spreading system for additive manufacturing, comprising a frame (1) and a forming platform (2), wherein the frame (1) is located directly above the forming platform (2), and the frame (1) A lead screw (3) and a sliding rod (4) are respectively installed on the lead screw (3), the two ends of the lead screw (3) are rotatably connected with a first fixing seat (5), and the lead screw (3) penetrates through the first flat plate ( 6), and is rotatably connected to the first plate (6), one end of the lead screw (3) penetrates the first fixing seat (5) and is connected to the first drive motor (7), and the sliding rod (4) A second fixing seat (8) is fixedly connected to the two ends of the sliding rod (4), the sliding rod (4) penetrates the second flat plate (9), and is slidably connected with the second flat plate (9), characterized in that the second flat plate ( 9) a scraper (10), a powder spreading roller (11) and a powder supply box (12) are fixedly installed on the bottom surface of the powder supply box (12) in sequence from left to right, and a powder inlet (13) is opened on the side of the powder supply box (12). A powder outlet (46) is provided at the bottom end of the powder supply box (12), the powder inlet (13) is connected with a powder inlet pipe (14), and the other end of the powder inlet pipe (14) It is connected with the powder outlet of the powder feeding hopper (15). The powder supply box (12) is provided with a stirring device (16) for breaking up the agglomerated powder. The stirring device (16) includes a first rotating A shaft (17) and first rotating blades (18) fixedly connected at equal intervals on both sides of the first rotating shaft (17), the first rotating shaft (17) passing through the top of the powder supply box (12) It is connected with the first central shaft (20) of the second driving motor (19), and the first central shaft (20) is also fixedly connected with a first transmission gear (21). The side surface is meshed with the second transmission gear (22). 2. A dynamic powder spreading system for additive manufacturing according to claim 1, characterized in that, the second transmission gear (22) is connected with powder for adhering to the first rotating blade (18) Cleared cleaning device (23). 3. A dynamic powder spreading system for additive manufacturing according to claim 2, characterized in that, the cleaning device (23) comprises a second rotating shaft (24), a second central shaft (25) and a second rotating shaft (25) The blade (26) and the first brush (27), the second rotating shaft (24) and the second central shaft (25) on the second transmission gear (22) are fixedly connected, the second rotating blade (26) are fixedly connected on both sides of the second rotating shaft (24) at equal intervals, and the first brushes (27) are mounted on the second rotating blades (26). 4. A dynamic powder spreading system for additive manufacturing according to claim 3, characterized in that, the side surface of the second transmission gear (22) is meshed with the third transmission gear (28), and the third transmission A blowing device (29) for removing the powder adhering to the first brush (27) is connected to the gear (28). 5. A dynamic powder spreading system for additive manufacturing according to claim 4, characterized in that, the blowing device (29) comprises a second rotating shaft (30), a third central shaft (31) and a third A rotating blade (32) and an air pipe (33), the second rotating shaft (30) is fixedly connected to the third central shaft (31) on the third transmission gear (28), and the third rotating blade (32) ) are fixedly connected at equal intervals on both sides of the second rotating shaft (30), the third rotating blade (32) is provided with air slits (34), and the air pipe (33) is fixed on the said air pipe (33) through bearings (35). Inside the second rotating shaft (30), one end of the air pipe (33) is connected to the air pump (36) through the third transmission gear (28), and the air pipe (33) is opposite to the third rotating blade (32). ) is provided with an air hole (37). 6. A dynamic powder spreading system for additive manufacturing according to claim 1, characterized in that, the powder spreading roller (11) is movably mounted on the second flat plate (9) through a first mounting bracket (38) On the second plate (9), a third drive motor (41) for driving the fourth transmission gear (40) is mounted on the second plate (9) through the second mounting bracket (39). The five transmission gears (42) are meshed and connected for driving the rotation of the powder spreading roller (11). 7. A dynamic powder spreading system for additive manufacturing according to claim 1, wherein a second brush (43) is installed between the scraper (10) and the powder spreading roller (11), The second brush (43) is used for cleaning the powder adhering to the powder spreading roller (11). 8. A dynamic powder spreading system for additive manufacturing according to claim 1, characterized in that a powder storage for storing powder is arranged between the powder feeding pipe (14) and the powder feeding hopper (15). A cavity (44), a control valve (45) for controlling the powder flow is arranged on the powder feeding pipe (14).

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