A powder preheating device for additive manufacturing

Abstract

The application relates to the field of additive manufacturing technology and discloses a powder preheating device for additive manufacturing, which comprises a heatable outer cylinder, a discharge port arranged at the bottom of the outer cylinder, a valve arranged on the discharge port, a rotating disc arranged in the inner part of the outer cylinder, a preheating cover fixedly connected to the outer wall of the top of the rotating disc, a through hole arranged at the middle of the top of the preheating cover, a rotating shaft one rotatably connected to the top of the outer cylinder, a driving motor arranged at the top end of the rotating shaft one, and the bottom end of the rotating shaft one fixedly connected to the top of the rotating disc through the through hole. When the powder is preheated, the powder can be moved to the inner wall of the preheating cover under the action of centrifugal force, and part of the powder can be moved to the center of the rotating disc under the pushing of the first pushing plate and the second pushing plate when the powder is moved, so that the powder is prevented from gathering during the preheating of the powder in the prior art, the powder can be uniformly heated, and the powder can reach the use temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of additive manufacturing, in particular to a powder preheating device for additive manufacturing. BACKGROUND

[0002] Additive manufacturing is a kind of rapid prototyping technology, also known as 3D printing, which is a technology that uses powdered metal or plastic and other materials that can be bonded to construct objects layer by layer based on digital model files.

[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. A powder preheating device for additive manufacturing is disclosed in Chinese patent CN114367678B, which comprises a base and a support plate, both sides of the base are provided with a support plate; a rotating door, both sides of the base are provided with a rotating door; a first bracket, both sides of the upper part of the base are provided with a first bracket; a fixed frame, a fixed frame is provided between the two first brackets; a first rotating plate, a first rotating plate is rotatably provided on the fixed frame; a first torsion spring, both sides of the first rotating plate are provided with a first torsion spring. The present application has a heating mechanism, which can be opened to preheat the powder through the heating mechanism, thereby achieving the effect of preheating. However, the above-mentioned preheating device will cause the metal powder to gather when preheating the metal powder, resulting in uneven heating of the metal powder and thus unable to ensure the quality of the product.

[0004] Therefore, the present application provides a powder preheating device for additive manufacturing to solve the above-mentioned problems in the prior art. SUMMARY

[0005] The purpose of the present application is to solve the problems existing in the prior art and provide a powder preheating device for additive manufacturing.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A powder preheating device for additive manufacturing, comprising an outer cylinder capable of heating, an outlet is arranged at the bottom of the outer cylinder, a valve is arranged on the outlet, a rotating disc is arranged inside the outer cylinder, a preheating cover is fixedly connected to the top outer wall of the rotating disc, a through hole is arranged in the middle of the top of the preheating cover, a rotating shaft one is rotatably connected to the top of the outer cylinder, a driving motor is arranged at the top end of the rotating shaft one, the bottom end of the rotating shaft one is fixedly connected to the top of the rotating disc through the through hole, a plurality of installation racks are equidistantly arranged on the outer wall of the top of the preheating cover, each installation rack comprises two pairs of installation plates, a rotating shaft two is rotatably connected between each pair of installation plates, a steel belt is sleeved on the outer wall of the two rotating shafts two, a driving mechanism is arranged at one end of each rotating shaft two, and a plurality of scraper mechanisms are equidistantly arranged on the outer wall of the steel belt.

[0008] Further, the outer cylinder top side is provided with a material conveying pipe, the bottom end of the pipe extends into the preheating cover, and the top end of the pipe is provided with a feeding hopper, and a sealing cover is screwed on the top end of the feeding hopper.

[0009] Further, the driving mechanism comprises a plurality of insulation covers, each of which is fixedly connected to the outer wall of the corresponding mounting plate, and the insulation cover insulates the one end of the second rotating shaft from the outside, and each of the top of the insulation cover and the top of the preheating cover is rotatably connected with the same third rotating shaft.

[0010] Further, the bottom end of the third rotating shaft is fixedly connected with a bevel gear two, and one side of the bevel gear two is engaged with a bevel gear one, and the bevel gear one is fixedly connected with the second rotating shaft, and the top end of the third rotating shaft is fixedly connected with a gear, and the outer wall of the plurality of gears is engaged with the same internal gear, and a plurality of fixed plates are fixedly connected between the internal gear and the inner wall of the outer cylinder.

[0011] Further, the scraping plate mechanism comprises a push plate one, the inside of the push plate one is provided with a containing cavity one, and the top of the containing cavity one is slidably connected with a push plate two, and the push plate two and the containing cavity one are fixedly connected with a supporting spring.

[0012] Further, the outer wall of the preheating cover is equidistantly provided with a plurality of through openings, and each of the through openings is provided with a containing cavity two above, and the containing cavity two is slidably connected with a material blocking plate at the connecting position of the containing cavity two and the through opening, and the lower part of the material blocking plate is sealingly and slidably connected with the inner wall of the through opening, and the material blocking plate can seal the through opening, and the cross section of the connecting position of the two adjacent through openings is semicircular.

[0013] Further, the top inner wall of the containing cavity two is provided with an electromagnet, and the inner wall of the containing cavity two is slidably connected with a sliding plate, the top wall of the sliding plate is fixedly connected with a magnetic plate, and the sliding plate and the top inner wall of the containing cavity two are fixedly connected with two connecting springs one, the magnetic force generated by the electromagnet after being electrified can generate an attractive force on the magnetic plate, and the bottom of the sliding plate is fixedly connected with the top of the material blocking plate.

[0014] Further, the outer wall above each of the third rotating shafts is fixedly connected with two fixed columns, and each of the third rotating shafts is provided with a gas storage tank on one side, the gas storage tank is fixedly connected to the top outer wall of the preheating cover, and the outer wall of the gas storage tank close to the third rotating shaft is slidably connected with a sliding rod, one end of the sliding rod close to the third rotating shaft is fixedly connected with an arc-shaped plate, and the other end of the sliding rod is fixedly connected with a piston plate.

[0015] Further, the piston plate is sealingly and slidably connected inside the gas storage tank, and the connecting spring two is fixedly connected between the piston plate and the inner wall of the gas storage tank, and the outer wall of one side of the top of the gas storage tank away from the sliding rod is provided with a one-way air inlet valve, and the one-way air inlet valve is provided with a one-way air conveying pipe below.

[0016] Further, the steel belt is provided with a gas jet pipe on one side, and a plurality of gas jet nozzles are arranged at equal distances on the side wall of the steel belt close to the gas jet pipe, the plurality of gas jet nozzles facing the top surface of the steel belt, and the lower end of the one-way gas pipe penetrates the preheating cover and is connected to the corresponding gas jet pipe.

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

[0018] 1. When the powder is preheated, the powder can be moved to the inner wall of the preheating cover by the centrifugal force, and part of the powder can be moved to the center of the rotating disc under the pushing of the first pushing plate and the second pushing plate, avoiding the aggregation of the powder during preheating, and the powder can be uniformly heated to reach the use temperature.

[0019] 2. When the powder is preheated, the through hole can be sealed by the blocking plate to prevent the powder in the preheating cover from running out, and when the preheating is completed, the blocking plate does not seal the through hole, and under the action of the centrifugal force, the powder can pass through the through hole, which is convenient for subsequent use.

[0020] 3. When the powder is preheated, the gas in the gas tank can continuously enter the gas jet pipe and finally be sprayed out through the plurality of gas jet nozzles on the gas jet pipe, so as to blow the surface of the steel belt and avoid residual powder on the surface of the steel belt. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A structure schematic view of a powder preheating device for additive manufacturing is proposed for example 1.

[0022] Figure 2 A rotating disc external structure schematic view of a powder preheating device for additive manufacturing is proposed for example 1.

[0023] Figure 3 A preheating cover top inner wall structure schematic view of a powder preheating device for additive manufacturing is proposed for example 1.

[0024] Figure 4 A partition cover cross-sectional structure schematic view of a powder preheating device for additive manufacturing is proposed for example 1.

[0025] Figure 5 A first pushing plate cross-sectional structure schematic view of a powder preheating device for additive manufacturing is proposed for example 1.

[0026] Figure 6 A rotating disc structure schematic view of a powder preheating device for additive manufacturing is proposed for example 2.

[0027] Figure 7 A through hole cross-sectional structure schematic view of a powder preheating device for additive manufacturing is proposed for example 2.

[0028] Figure 8 A schematic diagram of a rotary disc structure of a powder preheating device for additive manufacturing proposed in Embodiment 3;

[0029] Figure 9 A schematic diagram of a preheating cover top inner wall portion structure of a powder preheating device for additive manufacturing proposed in Embodiment 3;

[0030] Figure 10 A schematic diagram of a gas storage tank cross-sectional structure of a powder preheating device for additive manufacturing proposed in Embodiment 3.

[0031] In the figure: 1, outer cylinder; 2, rotating shaft one; 3, driving motor; 4, sealing cover; 5, feeding hopper; 6, rotary disc; 7, through hole; 8, fixed plate; 9, inner gear; 10, gear; 11, feeding pipe; 12, preheating cover; 13, rotating shaft two; 14, mounting plate; 15, isolation cover; 16, rotating shaft three; 17, steel belt; 18, push plate one; 19, bevel gear one; 20, bevel gear two; 21, containing cavity one; 22, push plate two; 23, supporting spring; 24, material blocking plate; 25, through port; 26, sliding plate; 27, connecting spring one; 28, containing cavity two; 29, electromagnet; 30, magnetic plate; 31, fixed column; 32, gas storage tank; 33, arc plate; 34, one-way gas feeding pipe; 35, gas jet pipe; 36, gas jet nozzle; 37, connecting spring two; 38, one-way air inlet valve; 39, piston plate; 40, sliding rod. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be further described in detail below in combination with specific embodiments.

[0033] Embodiment 1: Refer to Figures 1-5The utility model provides a kind of powder preheating device for additive manufacturing, including the outer tube 1 that can be heated, the outer tube 1 bottom is provided with discharge gate, discharge gate is provided with valve, the inner portion of outer tube 1 is provided with carousel 6, and carousel 6 top outer wall is fixedly connected with preheating cover 12, preheating cover 12 top middle is provided with through-hole 7, the top of outer tube 1 is rotatably connected with shaft one 2, and the top end of shaft one 2 is provided with driving motor 3, and the bottom end of shaft one 2 is fixedly connected with the top of carousel 6 by passing through through-hole 7, preheating cover 12 top outer wall is equidistantly provided with multiple groups of mounting bracket, and each group of mounting bracket includes two pairs of mounting plate 14, and each pair of mounting plate 14 is rotatably connected with shaft two 13, and the outer wall of two shaft two 13 is sleeved with steel band 17, and one end of one of shaft two 13 is provided with driving mechanism, and the outer wall of steel band 17 is equidistantly provided with multiple scraper mechanisms, when the powder in preheating cover 12 needs to be preheated, first, the temperature inside outer tube 1 rises until the temperature required for work is reached, then driving motor 3 rotates by shaft one 2, and shaft one 2 will rotate synchronously with carousel 6, and centrifugal force is generated during the rotation of carousel 6, so that the powder on carousel 6 moves and gradually approaches the inner wall of preheating cover 12, and during the above process, driving mechanism moves multiple steel bands 17, and multiple scraper mechanisms on the surface of steel band 17 push the moving powder to the center of carousel 6, so that the powder can be in constant motion, and the powder does not gather, avoiding the powder gathering during preheating in the past, so that the powder can be uniformly heated, and the powder can reach the temperature of use.

[0034] As a further scheme in the application, the top of the outer tube 1 is provided with a material conveying pipe 11, the bottom end of the material conveying pipe 11 extends into the preheating cover 12, and the top end of the material conveying pipe 11 is provided with a feeding hopper 5, the top end of the feeding hopper 5 is screwed with a sealing cover 4, and the powder can enter the inside of the preheating cover 12 through the feeding hopper 5 and the material conveying pipe 11.

[0035] As a further scheme in the application, 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 shaft two 13 from the outside, and each isolation cover 15 is rotatably connected with the same shaft three 16 at the top of the preheating cover 12.

[0036] As a further scheme of the present application, the bottom end of the rotating shaft three 16 is fixedly connected with the bevel gear two 20, one side of the bevel gear two 20 is engaged with the bevel gear one 19, the bevel gear one 19 is fixedly connected with the rotating shaft two 13, the top end of the rotating shaft three 16 is fixedly connected with the gear 10, and the outer wall of the plurality of gears 10 is engaged with the same internal gear 9, a plurality of fixed plates 8 are fixedly connected between the internal gear 9 and the inner wall of the outer cylinder 1, when the rotating disc 6 rotates with the preheating cover 12, the gears 10 on each rotating shaft three 16 are engaged with the internal gear 9, so that each rotating shaft three 16 can rotate, the bevel gear two 20 at the bottom end of the rotating shaft three 16 is engaged with the bevel gear one 19 on the rotating shaft two 13, so that the rotating shaft two 13 can rotate, thereby enabling the steel belt 17 sleeved on the rotating shaft two 13 to move.

[0037] As a further scheme of the present application, the scraper mechanism includes a push plate one 18, the inside of the push plate one 18 is provided with a containing cavity one 21, and the top of the containing cavity one 21 is slidably connected with a push plate two 22, a supporting spring 23 is fixedly connected between the push plate two 22 and the containing cavity one 21, when the push plate one 18 and the push plate two 22 are at the lower surface of the steel belt 17, the supporting spring 23 is in a natural state, at this time, the bottom end of the push plate two 22 is away from the top of the rotating disc 6, so that when the push plate one 18 and the push plate two 22 push the powder on the rotating disc 6, the powder can be evenly spread on the rotating disc 6 through the secondary gap, so that the powder can be uniformly heated, and when the push plate one 18 and the push plate two 22 are at the upper surface of the steel belt 17, at this time, the push plate two 22 is stressed, so that the push plate two 22 extrudes the supporting spring 23 and shrinks into the containing cavity one 21, and when the push plate two 22 is separated from the inner wall of the top of the sealing cover 4, the push plate two 22 is constantly vibrated under the action of the resilience of the supporting spring 23, so that the powder is prevented from remaining on the push plate two 22.

[0038] Working principle: when the powder in the preheating cover 12 needs to be preheated, first, the outer cylinder 1 makes the internal temperature rise until the required temperature for work is reached, then the driving motor 3 rotates through the rotating shaft one 2, which will rotate synchronously with the rotating disc 6, and the rotating disc 6 will generate centrifugal force during rotation, so that the powder on the rotating disc 6 will move and gradually approach the inner wall of the preheating cover 12, and in the above process, because the gears 10 on each rotating shaft three 16 are engaged with the internal gear 9, each rotating shaft three 16 can rotate, because the bevel gear two 20 at the bottom end of the rotating shaft three 16 is engaged with the bevel gear one 19 on the rotating shaft two 13, the rotating shaft two 13 can rotate, so that the steel belt 17 sleeved on the rotating shaft two 13 can move, and when the push plate one 18 and the push plate two 22 are on the upper surface of the steel belt 17, the push plate two 22 is stressed at this time, so that the push plate two 22 extrudes the supporting spring 23 to retract into the containing cavity one 21, and when the push plate two 22 is separated from the inner wall of the top of the sealing cover 4, under the action of the rebound force of the supporting spring 23, the push plate two 22 constantly vibrates, avoiding the powder remaining on the push plate two 22, so the cycle is repeated, so that the powder can be in constant motion and will not appear aggregation, avoiding the aggregation of the powder when preheating the powder in the past, so that the powder can be uniformly heated, and the powder can reach the use temperature.

[0039] Example 2: refer to Figures 1-7 A powder preheating device for additive manufacturing, compared with example 1, on the basis of example 1, a plurality of openings 25 are equidistantly arranged on the outer wall of the preheating cover 12, and a containing cavity two 28 is arranged above each opening 25, and a blocking plate 24 is slidably connected with the containing cavity two 28 at the connecting position of the containing cavity two 28 and the opening 25, and the lower part of the blocking plate 24 is sealingly and slidably connected with the inner wall of the opening 25, the blocking plate 24 can seal the opening 25, and the cross section of the connecting position of adjacent two openings 25 is semicircular, when preheating the powder, the opening 25 can be sealed by the blocking plate 24 to prevent the powder in the preheating cover 12 from running out.

[0040] As a further scheme in the present application, the top inner wall of the accommodating cavity two 28 is provided with an electromagnet 29, and the inner wall of the accommodating cavity two 28 is slidably connected with a sliding plate 26, the top wall of the sliding plate 26 is fixedly connected with a magnetic plate 30, and the sliding plate 26 and the top inner wall of the accommodating cavity two 28 are fixedly connected with two connecting springs one 27, the magnetic force generated after the electromagnet 29 is electrified can generate an attractive force on the magnetic plate 30, the bottom of the sliding plate 26 is fixedly connected with the top of the material blocking plate 24, and when the powder is preheated, the electromagnet 29 is electrified, because the magnetic force generated after the electromagnet 29 is electrified can generate an attractive force on the magnetic plate 30, the material blocking plate 24 can be retracted into the accommodating cavity two 28, so that the through hole 25 is opened, under the action of centrifugal force, the powder after heating can come out of the preheating cover 12 through the through hole 25, because the cross section of the connection between the two adjacent through holes 25 is semicircular, so that the powder can enter the through hole along the arc surface, avoiding the powder being stuck in the connection between the two through holes 25.

[0041] Working principle: when preheating the powder, the through hole 25 can be sealed by the material blocking plate 24 to prevent the powder in the preheating cover 12 from running out, and when the powder is preheated, the electromagnet 29 is electrified, because the magnetic force generated after the electromagnet 29 is electrified can generate an attractive force on the magnetic plate 30, the material blocking plate 24 can be retracted into the accommodating cavity two 28, so that the through hole 25 is opened, under the action of centrifugal force, the powder after heating can come out of the preheating cover 12 through the through hole 25, because the cross section of the connection between the two adjacent through holes 25 is semicircular, so that the powder can enter the through hole along the arc surface, avoiding the powder being stuck in the connection between the two through holes 25.

[0042] Embodiment 3: refer to Figures 1-10 A powder preheating device for additive manufacturing, compared with embodiment 2, on the basis of embodiment 2, two fixed columns 31 are symmetrically fixedly connected to the outer wall above each rotating shaft three 16, and a gas storage tank 32 is arranged on one side of each rotating shaft three 16, the gas storage tank 32 is fixedly connected to the top outer wall of the preheating cover 12, and the outer wall close to the rotating shaft three 16 of the gas storage tank 32 is slidably connected with a sliding rod 40, one end of the sliding rod 40 close to the rotating shaft three 16 is fixedly connected with an arc plate 33, and the other end of the sliding rod 40 is fixedly connected with a piston plate 39, when preheating the powder, the rotating shaft three 16 will rotate synchronously with the fixed column 31 on its surface, and the fixed column 31 will be in intermittent contact with the arc plate 33 on one end of the sliding rod 40 when rotating.

[0043] As a further scheme of the present application, the piston plate 39 is sealingly connected to the inside of the gas storage tank 32, and the piston plate 39 is fixedly connected with the inner wall of the gas storage tank 32 and is connected with the second connecting spring 37, a one-way air inlet valve 38 is arranged on the outer wall of the top of the gas storage tank 32 away from the slide rod 40, and a one-way gas conveying pipe 34 is arranged below the one-way air inlet valve 38. During the process that the fixed column 31 contacts the arc-shaped plate 33, the arc-shaped plate 33 is pressed, so that the arc-shaped plate 33 moves the piston plate 39 and the second connecting spring 37 through the slide rod 40, so that the piston plate 39 can extrude the gas in the space of the second connecting spring 37 into the one-way gas conveying pipe 34, and when the fixed column 31 is separated from the arc-shaped plate 33, the piston plate 39 is reset under the elastic force of the second connecting spring 37, so that the high-temperature gas in the outer cylinder 1 is sucked into the space of the second connecting spring 37 through the one-way air inlet valve 38. Such a cycle is repeated, so that the high-temperature gas in the outer cylinder 1 can be continuously sucked into the one-way gas conveying pipe 34.

[0044] As a further scheme of the present application, the steel belt 17 is provided with a gas jet pipe 35 on one side, and the gas jet pipe 35 is provided with a plurality of gas jet nozzles 36 at equal distances on the side wall close to the steel belt 17, the plurality of gas jet nozzles 36 are opposite to the top surface of the steel belt 17, the lower end of the one-way gas conveying pipe 34 penetrates the preheating cover 12 and is connected with the corresponding gas jet pipe 35 in communication, the gas in the one-way gas conveying pipe 34 enters the gas jet pipe 35 and is finally sprayed out through the plurality of gas jet nozzles 36, so that the surface of the steel belt 17 can be blown and cleaned to avoid residual powder, and when the high-temperature gas is sprayed out, the push plate one 18 and the push plate two 22 are heated at the same time and are kept at high temperature, and when the push plate one 18 and the push plate two 22 push the powder, the powder can be preheated again, so as to further improve the heating effect of the powder.

[0045] Working principle: when the powder is preheated, the rotating shaft 16 will rotate synchronously with the fixed column 31 on its surface, and the fixed column 31 will be in intermittent contact with the arc-shaped plate 33 on one end of the slide rod 40 when rotating, which will press the arc-shaped plate 33 during the contact between the fixed column 31 and the arc-shaped plate 33, so that the arc-shaped plate 33 moves the piston plate 39 connected to the spring 37 through the slide rod 40, so that the piston plate 39 can extrude the gas in the space connected with the spring 37 into the one-way gas conveying pipe 34, and when the fixed column 31 and the arc-shaped plate 33 are separated, the piston plate 39 resets under the action of the spring force of the spring 37, so that the high-temperature gas in the outer cylinder 1 is sucked into the space of the spring 37 through the one-way inlet valve 38, so as to be circulated repeatedly, so as to continuously suck the high-temperature gas in the outer cylinder 1 into the one-way gas conveying pipe 34, and the gas in the one-way gas conveying pipe 34 will enter the jet pipe 35, and finally be sprayed out through the multiple jet nozzles 36, so as to blow the surface of the steel belt 17 to avoid residual powder, and when the high-temperature gas is sprayed out, the push plate 18 and the push plate 22 will be heated at the same time, so that they always maintain high temperature, and when the push plate 18 and the push plate 22 push the powder, the powder can be preheated twice, so as to further improve the heating effect of the powder.

[0046] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A powder preheating device for additive manufacturing, comprising an outer cylinder (1) capable of being heated, a discharge port is arranged at the bottom of the outer cylinder (1), and a valve is arranged on the discharge port, characterized in that, The outer cylinder (1) is internally provided with a rotating disc (6), and the top outer wall of the rotating disc (6) is fixedly connected with a preheating cover (12), the top of the preheating cover (12) is provided with a through hole (7), the top of the outer cylinder (1) is rotatably connected with a rotating shaft (2), and the top end of the rotating shaft (2) is provided with a driving motor (3), the bottom end of the rotating shaft (2) is fixedly connected with the rotating disc (6) through the through hole (7), a plurality of groups of mounting racks are equidistantly arranged on the top outer wall of the preheating cover (12), each group of mounting racks comprises two pairs of mounting plates (14), a rotating shaft (13) is rotatably connected between each pair of mounting plates (14), and the outer walls of the two rotating shafts (13) are sleeved with a steel belt (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 The top side of the outer cylinder (1) is provided with a feeding pipe (11), the bottom end of the feeding pipe (11) extends into the preheating cover (12), and the top end of the feeding pipe (11) is provided with a feeding hopper (5), and the top end of the feeding hopper (5) is screwed with a sealing cover (4).

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

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

5. A powder preheating device for additive manufacturing according to claim 4, characterized in that The scraper mechanism comprises a push plate (18), the inner wall of the push plate (18) is provided with a containing cavity (21), and the top of the containing cavity (21) is slidably connected with a push plate (22), the push plate (22) and the containing cavity (21) are fixedly connected with a supporting spring (23).

6. The powder preheating device for additive manufacturing according to claim 1, characterized in that, The outer wall of the preheating cover (12) is equidistantly provided with a plurality of through openings (25), and each through opening (25) is provided with a containing cavity (28) above, the containing cavity (28) and the through opening (25) are slidably connected with a blocking plate (24), and the lower part of the blocking plate (24) is sealingly and slidably connected with the inner wall of the through opening (25), the blocking plate (24) can seal the through opening (25), and the cross section of the connecting portion of two adjacent through openings (25) is semicircular.

7. A powder preheating device for additive manufacturing according to claim 6, characterized in that The accommodating cavity two (28) top inner wall is provided with an electromagnet (29), and the accommodating cavity two (28) inner wall is slidably connected with a sliding plate (26), the top wall of the sliding plate (26) is fixedly connected with a magnetic plate (30), and the sliding plate (26) and the top inner wall of the accommodating cavity two (28) are fixedly connected with two connecting springs one (27), 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 sliding plate (26) is fixedly connected with the top of the baffle plate (24).

8. A powder preheating device for additive manufacturing according to claim 5, characterized in that, Each of the outer walls above the rotating shaft three (16) is fixedly connected with two fixed columns (31), and each of the rotating shaft three (16) is provided with a gas storage tank (32), the gas storage tank (32) is fixedly connected to the outer wall on the top of the preheating cover (12), and the outer wall of the gas storage tank (32) near the rotating shaft three (16) is slidably connected with a sliding rod (40), one end of the sliding rod (40) near the rotating shaft three (16) is fixedly connected with an arc plate (33), and the other end of the sliding rod (40) is fixedly connected with a piston plate (39).

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

10. A powder preheating device for additive manufacturing according to claim 9, characterized in that The steel belt (17) is provided with a gas jet pipe (35) on one side, and a plurality of gas jet nozzles (36) are arranged at equal distances on the outer wall of the gas jet pipe (35) near the steel belt (17), the plurality of gas jet nozzles (36) are opposite to the top surface of the steel belt (17), and the lower end of the one-way air inlet valve (38) penetrates the preheating cover (12) and is connected with the corresponding gas jet pipe (35).

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