Powder preheating device for additive manufacturing

Abstract

The invention relates to the technical field of additive manufacturing, and discloses a powder preheating device for additive manufacturing, which comprises an outer cylinder capable of heating, a discharge port formed in the bottom of the outer cylinder, a valve arranged on the discharge port, a turntable arranged in the outer cylinder, a preheating cover fixedly connected to the outer wall of the top of the turntable, and a through hole formed in the middle of the top of the preheating cover, a first rotating shaft is rotationally connected to the top of the outer barrel, a driving motor is arranged at the top end of the first rotating shaft, and the bottom end of the first rotating shaft penetrates through the through hole to be fixedly connected with the top of the rotating disc. When powder is preheated, the powder can move towards the inner wall of the preheating cover under the action of centrifugal force, and when the powder moves, part of the powder can move towards the circle center of the rotary disc under pushing of a first push plate and a second push plate, so that the situation that the powder is gathered when the powder is preheated in the prior art is avoided, the powder can be evenly heated, and the powder is evenly heated. And the powder can reach the use temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a powder preheating device for additive manufacturing. Background Art

[0002] Additive manufacturing is a type of rapid prototyping technology, also known as 3D printing. It is a technology that uses digital model files as the basis and uses adhesive materials such as powdered metal or plastic to construct objects by printing layer by layer.

[0003] In the process of additive manufacturing, in order to ensure the quality of the product, the metal powder used will be preheated to solve the problem of residual stress caused by uneven temperature field. The Chinese patent with patent publication number CN114367678B discloses a powder preheating device for additive manufacturing, including: a base and a support plate, with support plates on both sides of the base; a rotating door, with rotating doors rotatably provided on both sides of the base; a first bracket, with first brackets on both sides of the upper part of the base; a fixed frame, with a fixed frame between the two first brackets; a first rotating plate, with a first rotating plate rotatably provided on the fixed frame; a first torsion spring, with first torsion springs wound on both sides of the first rotating plate. The present invention is provided with a heating mechanism, people can turn on the heating mechanism, and then preheat the powder through the heating mechanism, thereby achieving the preheating effect, but when the above-mentioned preheating device preheats the metal powder, the metal powder will aggregate, resulting in uneven heating of the metal powder, thereby failing to ensure the quality of the product.

[0004] In view of this, the present invention proposes a powder preheating device for additive manufacturing to solve the problems existing in the above-mentioned prior art. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a powder preheating device for additive manufacturing.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A powder preheating device for additive manufacturing comprises a heatable outer cylinder, a discharge port is arranged at the bottom of the outer cylinder, a valve is arranged on the discharge port, a turntable is arranged inside the outer cylinder, and a preheating cover is fixedly connected to the outer wall of the top of the turntable, a through hole is arranged in the middle of the top of the preheating cover, a rotating shaft 1 is rotatably connected to the top of the outer cylinder, and a driving motor is arranged at the top of the rotating shaft 1, the bottom end of the rotating shaft 1 passes through the through hole and is fixedly connected to the top of the turntable, a plurality of groups of mounting frames are equidistantly arranged on the outer wall of the top of the preheating cover, and each group of mounting frames comprises two pairs of mounting plates, a rotating shaft 2 is rotatably connected between each pair of the mounting plates, and the outer walls of the two rotating shafts 2 are sleeved with steel belts, one end of the rotating shaft 2 is provided with a driving mechanism, and a plurality of scraper mechanisms are equidistantly arranged on the outer wall of the steel belt.

[0008] Furthermore, a feed pipe is provided on one side of the top of the outer cylinder, the bottom end of the feed pipe extends into the preheating cover, and a feed hopper is provided on the top of the feed pipe, and a sealing cover is screwed on the top of the feed hopper.

[0009] Furthermore, the driving mechanism includes a plurality of isolation covers, each of which is fixedly connected to the outer wall of the corresponding mounting plate, and the isolation cover isolates one end of the rotating shaft 2 from the outside, and the top of each isolation cover and the top of the preheating cover are rotatably connected to the same rotating shaft 3.

[0010] Furthermore, the bottom end of the rotating shaft three is fixedly connected with bevel gear two, and one side of bevel gear two is meshed with bevel gear one, the bevel gear one is fixedly connected to the rotating shaft two, the top ends of the rotating shaft three are all fixedly connected with gears, and the outer walls of multiple gears are all meshed with the same internal gear, and multiple fixing plates are fixedly connected between the internal gear and the inner wall of the outer cylinder.

[0011] Furthermore, the scraper mechanism includes a push plate 1, a receiving chamber 1 is arranged inside the push plate 1, and a push plate 2 is slidably connected to the top of the receiving chamber 1, and a support spring is fixedly connected between the push plate 2 and the receiving chamber 1.

[0012] Furthermore, the outer wall of the preheating hood is provided with a plurality of openings at equal distances, and a second accommodating chamber is provided above each opening, a material baffle plate is slidably connected at the connection between the second accommodating chamber and the opening, and the lower part of the material baffle plate is sealingly slidably connected to the inner wall of the opening, the material baffle plate can seal the opening, and the cross-section of the connection between two adjacent openings is semicircular.

[0013] Furthermore, an electromagnet is provided on the inner wall at the top of the second accommodating chamber, and a slide plate is slidably connected to the inner wall of the second accommodating chamber, a magnetic plate is fixedly connected to the top wall of the slide plate, and two connecting springs are fixedly connected between the slide plate and the inner wall at the top of the second accommodating chamber. The magnetic force generated by the electromagnet after being energized can generate suction on the magnetic plate, and the bottom of the slide plate is fixedly connected to the top of the material baffle plate.

[0014] Furthermore, two fixing columns are symmetrically fixedly connected to the outer wall above each of the rotating shafts three, and an air storage box is arranged on one side of each of the rotating shafts three, the air storage box is fixedly connected to the outer wall at the top of the preheating cover, and a sliding rod is slidably connected to the outer wall of the air storage box close to the rotating shaft three, one end of the sliding rod close to the rotating shaft three is fixedly connected to an arc plate, and the other end of the sliding rod is fixedly connected to a piston plate.

[0015] Furthermore, the piston plate is sealingly and slidably connected to the inside of the air storage box, and a connecting spring 2 is fixedly connected between the piston plate and the inner wall of the air storage box. A one-way air intake valve is arranged on the outer wall of the top of the air storage box on the side away from the sliding rod, and a one-way air supply pipe is arranged below the one-way air intake valve.

[0016] Furthermore, an air jet pipe is provided on one side of the steel strip, and a plurality of air jet nozzles are provided at equal distances on the outer wall of the air jet pipe close to the steel strip, and the plurality of air jet nozzles face the top surface of the steel strip. The lower end of the one-way air pipe passes through the preheating hood and is connected to the corresponding air jet pipe.

[0017] The beneficial effects of the present invention are:

[0018] 1. When preheating powder, the present invention can move the powder to the inner wall of the preheating cover through the action of centrifugal force, and when the powder moves, under the push of the push plate 1 and the push plate 2, part of the powder can move to the center of the turntable, thereby avoiding the situation that the powder aggregates when preheating the powder in the past, and can make the powder evenly heated so that the powder can reach the use temperature.

[0019] 2. When preheating the powder, the baffle plate can seal the opening to prevent the powder in the preheating cover from escaping. When the preheating is completed, the baffle plate is not sealed to the opening, and the powder can come out through the opening under the action of centrifugal force, which is convenient for subsequent use.

[0020] 3. When preheating the powder, the gas in the gas storage box can continuously enter the injection pipe, and finally be ejected through multiple injection nozzles on the injection pipe, so as to purge the surface of the steel strip and avoid powder residue on the surface of the steel strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a powder preheating device for additive manufacturing proposed in Example 1;

[0022] Figure 2 This is a schematic diagram of the external structure of a turntable of a powder preheating device for additive manufacturing proposed in Example 1;

[0023] Figure 3 This is a schematic diagram of the top inner wall structure of a preheating hood of a powder preheating device for additive manufacturing proposed in Example 1;

[0024] Figure 4 This is a schematic cross-sectional structure diagram of an isolation cover of a powder preheating device for additive manufacturing proposed in Example 1;

[0025] Figure 5 This is a schematic cross-sectional structure diagram of a push plate of a powder preheating device for additive manufacturing proposed in Example 1;

[0026] Figure 6 This is a schematic diagram of the turntable structure of a powder preheating device for additive manufacturing proposed in Example 2;

[0027] Figure 7 This is a schematic diagram of the cross-sectional structure of a powder preheating device for additive manufacturing proposed in Example 2;

[0028] Figure 8 This is a schematic diagram of the turntable structure of a powder preheating device for additive manufacturing proposed in Example 3;

[0029] Fig. 9 This is a schematic diagram of the structure of the top inner wall portion of a preheating hood of a powder preheating device for additive manufacturing proposed in Example 3;

[0030] Fig.10 This is a schematic diagram of the cross-sectional structure of an air storage box of a powder preheating device for additive manufacturing proposed in Example 3.

[0031] In the figure: 1, outer cylinder; 2, rotating shaft 1; 3, driving motor; 4, sealing cover; 5, feeding hopper; 6, rotating disk; 7, through hole; 8, fixing plate; 9, internal gear; 10, gear; 11, feeding pipe; 12, preheating cover; 13, rotating shaft 2; 14, mounting plate; 15, isolation cover; 16, rotating shaft 3; 17, steel belt; 18, pushing plate 1; 19, bevel gear 1; 20, bevel gear 2; 21, accommodating chamber 1 ; 22. Push plate 2; 23. Support spring; 24. Material stopper; 25. Through port; 26. Slide plate; 27. Connecting spring 1; 28. Accommodating chamber 2; 29. ​​Electromagnet; 30. Magnetic plate; 31. Fixed column; 32. Air storage box; 33. Arc plate; 34. One-way air pipe; 35. Jet pipe; 36. Jet nozzle; 37. Connecting spring 2; 38. One-way air inlet valve; 39. Piston plate; 40. Sliding rod. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0033] Example 1: Reference Figure 1-Figure 5A powder preheating device for additive manufacturing comprises a heatable outer cylinder 1, a discharge port is arranged at the bottom of the outer cylinder 1, a valve is arranged on the discharge port, a turntable 6 is arranged inside the outer cylinder 1, and a preheating cover 12 is fixedly connected to the outer wall of the top of the turntable 6, a through hole 7 is arranged in the middle of the top of the preheating cover 12, a rotating shaft 2 is rotatably connected to the top of the rotating shaft 2, a driving motor 3 is arranged at the top of the rotating shaft 2, the bottom end of the rotating shaft 2 passes through the through hole 7 and is fixedly connected to the top of the turntable 6, a plurality of groups of mounting frames are equidistantly arranged on the outer wall of the top of the preheating cover 12, and each group of mounting frames comprises two pairs of mounting plates 14, a rotating shaft 2 13 is rotatably connected between each pair of mounting plates 14, and the outer walls of the two rotating shafts 2 13 are sleeved with steel belts 17, one end of each rotating shaft 2 13 is provided with a driving mechanism, and a plurality of scraper mechanisms are equidistantly arranged on the outer wall of the steel belt 17 When it is necessary to preheat the powder in the preheating cover 12, first the outer cylinder 1 raises its internal temperature until it reaches the temperature required for work, and then the driving motor 3 rotates through the shaft 2, and the shaft 2 will rotate synchronously with the turntable 6, and the turntable 6 will generate centrifugal force during the rotation process, so that the powder on the turntable 6 will move and gradually approach the inner wall of the preheating cover 12. In the above process, the driving mechanism will move multiple steel belts 17, and when the steel belts 17 move, the multiple scraper mechanisms on the surface of the steel belts 17 will push the moving powder to the center of the turntable 6. This cycle is repeated, so that the powder can be in a continuous motion process and will not aggregate, avoiding the aggregation of powder when preheating the powder in the past, and can make the powder evenly heated so that the powder can reach the use temperature.

[0034] As a further solution in the present invention, a feed pipe 11 is provided on one side of the top of the outer cylinder 1, the bottom end of the feed pipe 11 extends into the preheating cover 12, and a feed hopper 5 is provided on the top of the feed pipe 11, and a sealing cover 4 is screwed on the top of the feed hopper 5, and the powder can enter the interior of the preheating cover 12 through the feed hopper 5 and the feed pipe 11.

[0035] As a further solution of the present invention, the driving mechanism includes multiple isolation covers 15, each isolation cover 15 is fixedly connected to the outer wall of the corresponding mounting plate 14, and the isolation cover 15 isolates one end of the rotating shaft 2 13 from the outside, and the top of each isolation cover 15 and the top of the preheating cover 12 are rotatably connected to the same rotating shaft 3 16.

[0036] As a further solution in the present invention, a bevel gear 20 is fixedly connected to the bottom end of the rotating shaft 3 16, and a bevel gear 19 is meshed on one side of the bevel gear 20, and the bevel gear 19 is fixedly connected to the rotating shaft 2 13. The top of the rotating shaft 3 16 is fixedly connected to a gear 10, and the outer walls of multiple gears 10 are meshed with the same internal gear 9, and multiple fixed plates 8 are fixedly connected between the internal gear 9 and the inner wall of the outer cylinder 1. When the turntable 6 rotates with the preheating cover 12, the gears 10 on each rotating shaft 3 16 are meshed with the internal gear 9, so that each rotating shaft 3 16 can rotate, and the bevel gear 20 at the bottom end of the rotating shaft 3 16 is meshed with the bevel gear 19 on the rotating shaft 2 13, so that the rotating shaft 2 13 can rotate, thereby enabling the steel belt 17 sleeved on the rotating shaft 2 13 to move.

[0037] As a further solution of the present invention, the scraper mechanism includes a push plate 18, a receiving chamber 21 is arranged inside the push plate 18, and a push plate 22 is slidably connected to the top of the receiving chamber 21, and a support spring 23 is fixedly connected between the push plate 22 and the receiving chamber 21. When the push plate 18 and the push plate 22 are on the lower surface of the steel belt 17, the support spring 23 is in a natural state. At this time, there is a gap between the bottom end of the push plate 22 and the top of the turntable 6, so that when the push plate 18 and the push plate 22 are When push plate 22 pushes the powder on the turntable 6, the powder can be spread on the turntable 6 through the secondary gap, so that the powder can be evenly heated. When push plate 1 18 and push plate 22 are on the upper surface of the steel belt 17, push plate 22 is subjected to force, so that push plate 22 squeezes the support spring 23 and retracts into the accommodating chamber 1 21. When push plate 22 is separated from the inner wall of the top of the sealing cover 4, the push plate 22 is continuously vibrated under the action of the rebound force of the support spring 23 to prevent powder from remaining on the push plate 22.

[0038] Working principle: when it is necessary to preheat the powder in the preheating cover 12, first the outer cylinder 1 raises its internal temperature until it reaches the temperature required for work, and then the driving motor 3 rotates through the rotating shaft 2, and the rotating shaft 2 will rotate synchronously with the turntable 6, and the turntable 6 will generate centrifugal force during the rotation process, so that the powder on the turntable 6 will move and gradually approach the inner wall of the preheating cover 12, and in the above process, because the gear 10 on each rotating shaft 3 16 is meshed with the internal gear 9, each rotating shaft 3 16 can be rotated, and because the bevel gear 2 20 at the bottom of the rotating shaft 3 16 is meshed with the bevel gear 1 19 on the rotating shaft 2 13, the rotating shaft 2 13 can be rotated, so It can make the steel belt 17 sleeved on the rotating shaft 13 move, and when the push plate 18 and the push plate 22 are on the upper surface of the steel belt 17, the push plate 22 is subjected to force, so that the push plate 22 squeezes the support spring 23 and retracts into the accommodating chamber 1 21, and when the push plate 22 is separated from the inner wall of the top of the sealing cover 4, the push plate 22 is continuously vibrated under the action of the rebound force of the support spring 23 to avoid powder remaining on the push plate 22, and this cycle is repeated, which can keep the powder in a continuous motion process without aggregation, avoiding the aggregation of powder when preheating the powder in the past, and can make the powder evenly heated so that the powder can reach the use temperature.

[0039] Example 2: Reference Figure 1-Figure 7 , a powder preheating device for additive manufacturing. Compared with Example 1, on the basis of Example 1, a plurality of openings 25 are equidistantly provided on the outer wall of the preheating cover 12, and a second accommodating chamber 28 is provided above each opening 25. A material baffle plate 24 is slidably connected at the connection between the second accommodating chamber 28 and the opening 25, and a lower portion of the material baffle plate 24 is sealingly slidably connected to the inner wall of the opening 25. The material baffle plate 24 can seal the opening 25. The cross-section of the connection between two adjacent openings 25 is semicircular. When preheating the powder, the opening 25 can be sealed by the material baffle plate 24 to prevent the powder in the preheating cover 12 from escaping.

[0040] As a further solution in the present invention, an electromagnet 29 is provided on the inner wall of the top of the second accommodating chamber 28, and a slide plate 26 is slidably connected to the inner wall of the second accommodating chamber 28, a magnetic plate 30 is fixedly connected to the top wall of the slide plate 26, and two connecting springs 1 27 are fixedly connected between the slide plate 26 and the inner wall of the top of the second accommodating chamber 28. The magnetic force generated by the electromagnet 29 after being energized can generate suction on the magnetic plate 30, and the bottom of the slide plate 26 is fixedly connected to the top of the baffle plate 24. When the powder is preheated, the electromagnet 29 is energized. The magnetic force generated by the electromagnet 29 after being energized can generate suction on the magnetic plate 30, so that the baffle plate 24 can be retracted into the second accommodating chamber 28, thereby opening the through opening 25. Under the action of centrifugal force, the heated powder can come out of the preheating cover 12 through the through opening 25. Because the cross-section of the connection between the two adjacent through openings 25 is semicircular, the powder can enter the through opening along the arc surface, thereby avoiding the powder being stuck at the connection between the two through openings 25.

[0041] Working principle: When preheating the powder, the baffle plate 24 can seal the opening 25 to prevent the powder in the preheating cover 12 from escaping. When the powder is preheated, the electromagnet 29 is energized. The magnetic force generated by the electromagnet 29 after being energized can generate suction on the magnetic plate 30, so that the baffle plate 24 can be retracted into the accommodating chamber 28, thereby opening the opening 25. Under the action of centrifugal force, the heated powder can come out of the preheating cover 12 through the opening 25. Because the cross-section of the connection between two adjacent openings 25 is semicircular, the powder can enter the opening along the arc surface to avoid the powder being stuck at the connection between the two openings 25.

[0042] Example 3: Reference Figure 1-Figure 10 , a powder preheating device for additive manufacturing. Compared with Example 2, on the basis of Example 2, two fixed columns 31 are symmetrically fixedly connected to the outer wall above each rotating shaft three 16, and an air storage box 32 is arranged on one side of each rotating shaft three 16, the air storage box 32 is fixedly connected to the outer wall of the top of the preheating cover 12, and the air storage box 32 is slidably connected to a slide rod 40 near the outer wall of the rotating shaft three 16, the end of the slide rod 40 near the rotating shaft three 16 is fixedly connected to an arc plate 33, and the other end of the slide rod 40 is fixedly connected to a piston plate 39. When preheating the powder, the rotating shaft three 16 will synchronously rotate with the fixed columns 31 on its surface when rotating, and the fixed columns 31 will intermittently contact the arc plate 33 on one end of the slide rod 40 when rotating.

[0043] As a further solution of the present invention, the piston plate 39 is sealingly slidably connected to the inside of the air storage box 32, and a connecting spring 37 is fixedly connected between the piston plate 39 and the inner wall of the air storage box 32. A one-way air intake valve 38 is provided on the outer wall of the top of the air storage box 32 away from the slide rod 40, and a one-way air supply pipe 34 is provided below the one-way air intake valve 38. When the fixed column 31 contacts the arc plate 33, the arc plate 33 is pressed, so that the arc plate 33 causes the piston plate 39 to move through the slide rod 40. 9 To move the connecting spring 2 37, the piston plate 39 can squeeze the gas in the space where the connecting spring 2 37 is located into the one-way gas pipe 34, and when the fixing column 31 is separated from the arc plate 33, the piston plate 39 is reset under the action of the rebound force of the connecting spring 2 37, so that the high-temperature gas in the outer tube 1 is sucked into the space where the connecting spring 2 37 is located through the one-way air inlet valve 38, and this cycle is repeated, so that the high-temperature gas in the outer tube 1 can be continuously sucked into the one-way gas pipe 34.

[0044] As a further solution in the present invention, an air jet pipe 35 is provided on one side of the steel belt 17, and a plurality of air jet nozzles 36 are equidistantly provided on the outer wall of the air jet pipe 35 on one side close to the steel belt 17, and the plurality of air jet nozzles 36 are directly facing the top surface of the steel belt 17. The lower end of the one-way air pipe 34 passes through the preheating cover 12 and is connected with the corresponding air jet pipe 35. The gas in the one-way air pipe 34 will enter the air jet pipe 35 and finally be ejected through the plurality of air jet nozzles 36, so that the surface of the steel belt 17 can be purged to avoid residual powder. When the high-temperature gas is ejected, the push plate 18 and the push plate 2 22 will be heated at the same time to keep the high temperature at all times. When the push plate 18 and the push plate 2 22 push the powder, the powder can be preheated for a second time, thereby further improving the heating effect of the powder.

[0045] Working principle: when preheating the powder, the rotating shaft 31 will rotate synchronously with the fixed column 31 on its surface, and the fixed column 31 will intermittently contact the arc plate 33 on one end of the sliding rod 40 when rotating. When the fixed column 31 contacts the arc plate 33, the arc plate 33 is pressed, so that the arc plate 33 moves the piston plate 39 to the connecting spring 2 37 through the sliding rod 40, so that the piston plate 39 can squeeze the gas in the space where the connecting spring 2 37 is located into the one-way gas supply pipe 34, and when the fixed column 31 is separated from the arc plate 33, the piston plate 39 is reset under the action of the rebound force of the connecting spring 2 37, and the piston plate 39 is pressed to the one-way gas supply pipe 34. The high-temperature gas in the outer tube 1 is sucked into the space where the connecting spring 2 37 is located through the one-way air intake valve 38, and this cycle is repeated, so that the high-temperature gas in the outer tube 1 can be continuously sucked into the one-way air supply pipe 34, and the gas in the one-way air supply pipe 34 will enter the injection pipe 35, and finally be ejected through multiple injection nozzles 36, so that the surface of the steel belt 17 can be purged to avoid residual powder. When the high-temperature gas is ejected, the push plate 1 18 and the push plate 2 22 are heated at the same time to keep them at a high temperature at all times. When the push plate 18 and the push plate 2 22 push the powder, the powder can be preheated for a second time, thereby further improving the heating effect of the powder.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A powder preheating device for additive manufacturing, comprising a heatable outer cylinder (1), a discharge port being arranged at the bottom of the outer cylinder (1), and a valve being arranged on the discharge port, characterized in that: A turntable (6) is arranged inside the outer cylinder (1), and a preheating cover (12) is fixedly connected to the outer wall of the top of the turntable (6), a through hole (7) is arranged in the middle of the top of the preheating cover (12), a rotating shaft (2) is rotatably connected to the top of the outer cylinder (1), and a driving motor (3) is arranged at the top of the rotating shaft (2), the bottom end of the rotating shaft (2) passes through the through hole (7) and is fixedly connected to the top of the turntable (6), a plurality of groups of mounting frames are equidistantly arranged on the outer wall of the top of the preheating cover (12), and each group of mounting frames includes two pairs of mounting plates (14), a rotating shaft (13) is rotatably connected between each pair of the mounting plates (14), and the outer walls of the two rotating shafts (13) are sleeved with steel belts (17), one end of each rotating shaft (13) is provided with a driving mechanism, and a plurality of scraper mechanisms are equidistantly arranged on the outer wall of the steel belt (17).

2. A powder preheating device for additive manufacturing according to claim 1, characterized in that: A material delivery pipe (11) is arranged on one side of the top of the outer cylinder (1), the bottom end of the material delivery pipe (11) extends into the preheating cover (12), and a material feed hopper (5) is arranged on the top of the material delivery pipe (11), and a sealing cover (4) is screwed on the top of the material feed hopper (5).

3. A powder preheating device for additive manufacturing according to claim 2, characterized in that: The driving mechanism comprises a plurality of isolation covers (15), each of which is fixedly connected to the outer wall of the corresponding mounting plate (14), and the isolation cover (15) isolates one end of the second rotating shaft (13) from the outside, and the top of each isolation cover (15) and the top of the preheating cover (12) are rotatably connected to the same third rotating shaft (16).

4. The powder preheating device for additive manufacturing according to claim 3, characterized in that: The bottom end of the rotating shaft three (16) is fixedly connected to a bevel gear two (20), and one side of the bevel gear two (20) is meshed with a bevel gear one (19), and the bevel gear one (19) is fixedly connected to the rotating shaft two (13), and the top end of the rotating shaft three (16) is fixedly connected to a gear (10), and the outer walls of the plurality of gears (10) are meshed with the same internal gear (9), and a plurality of fixing plates (8) are fixedly connected between the internal gear (9) and the inner wall of the outer cylinder (1).

5. The powder preheating device for additive manufacturing according to claim 4, characterized in that: The scraper mechanism comprises a push plate (18), a receiving chamber (21) is arranged inside the push plate (18), and a push plate (22) is slidably connected to the top of the receiving chamber (21), and a support spring (23) is fixedly connected between the push plate (22) and the receiving chamber (21).

6. The powder preheating device for additive manufacturing according to claim 1, characterized in that: The outer wall of the preheating cover (12) is provided with a plurality of openings (25) at equal intervals, and a second accommodating chamber (28) is provided above each opening (25); a material blocking plate (24) is slidably connected to the connection between the second accommodating chamber (28) and the opening (25), and a lower portion of the material blocking plate (24) is sealingly slidably connected to the inner wall of the opening (25); the material blocking plate (24) can seal the opening (25), and the cross-section of the connection between two adjacent openings (25) is semicircular.

7. The powder preheating device for additive manufacturing according to claim 6, characterized in that: An electromagnet (29) is provided on the inner wall of the top of the second accommodating chamber (28), and a slide plate (26) is slidably connected to the inner wall of the second accommodating chamber (28), a magnetic plate (30) is fixedly connected to the top wall of the slide plate (26), and two connecting springs (27) are fixedly connected between the slide plate (26) and the inner wall of the top of the second accommodating chamber (28), the magnetic force generated by the electromagnet (29) after being energized can generate suction force on the magnetic plate (30), and the bottom of the slide plate (26) is fixedly connected to the top of the material blocking plate (24).

8. The powder preheating device for additive manufacturing according to claim 5, characterized in that: Two fixing columns (31) are symmetrically fixedly connected to the outer wall above each rotating shaft three (16), and an air storage box (32) is arranged on one side of each rotating shaft three (16). The air storage box (32) is fixedly connected to the outer wall at the top of the preheating cover (12), and a sliding rod (40) is slidably connected to the outer wall of the rotating shaft three (16) near the air storage box (32), and one end of the sliding rod (40) near the rotating shaft three (16) is fixedly connected to an arc plate (33), and the other end of the sliding rod (40) is fixedly connected to a piston plate (39).

9. The powder preheating device for additive manufacturing according to claim 8, characterized in that: The piston plate (39) is sealingly and slidably connected to the inside of the air storage box (32), and a second connecting spring (37) is fixedly connected between the piston plate (39) and the inner wall of the air storage box (32). A one-way air intake valve (38) is arranged on the outer wall of the top of the air storage box (32) away from the sliding rod (40), and a one-way air supply pipe (34) is arranged below the one-way air intake valve (38).

10. The powder preheating device for additive manufacturing according to claim 9, characterized in that: An air jet pipe (35) is provided on one side of the steel strip (17), and a plurality of air jet nozzles (36) are provided at equal distances on an outer wall of a side of the air jet pipe (35) close to the steel strip (17), and the plurality of air jet nozzles (36) face the top surface of the steel strip (17). The lower end of the one-way air delivery pipe (34) passes through the preheating cover (12) and is connected to the corresponding air jet pipe (35).

Images