CN116197414A

CN116197414A - Powder preheating device for additive manufacturing

Info

Publication number: CN116197414A
Application number: CN202310353661.1A
Authority: CN
Inventors: 何博; 殷嘉豪
Original assignee: Shanghai Angat Laser Technology Co ltd
Current assignee: Shanghai Angat Laser Technology Co ltd
Priority date: 2023-04-05
Filing date: 2023-04-05
Publication date: 2023-06-02

Abstract

The invention discloses a powder preheating device for additive manufacturing, which relates to the field of additive manufacturing and comprises an outer cylinder, wherein the top end of the outer cylinder is communicated with a feed inlet, the side wall of the outer cylinder is provided with an electric heating wire, the top end of the outer cylinder is provided with a driving mechanism, one end of the driving mechanism extending to the inside of the outer cylinder is fixedly connected with an outer pipe, the inside of the outer pipe is provided with an auger connected with the driving mechanism, the top end of the outer pipe is provided with a plurality of groups of discharge holes, the inner wall of the outer cylinder is fixedly connected with a grinding mechanism connected with the outer pipe, and the outer wall of the outer pipe is provided with a stirring mechanism positioned below the grinding mechanism. The invention can fully stir the metal powder when the powder preheating device for additive manufacturing is used, so that the metal powder is fully heated, and the agglomerated powder remained in the last processing in the metal powder can be avoided, so that the quality of the product can be effectively ensured in the additive manufacturing process.

Description

Powder preheating device for additive manufacturing

Technical Field

The invention relates to the field of additive manufacturing, in particular to a powder preheating device for additive manufacturing.

Background

An additive manufacturing, namely a rapid prototyping technology, is also called 3D printing, which is a technology for constructing objects by using powdery metal or plastic and other bondable materials on the basis of digital model files in a layer-by-layer printing mode, and the 3D printing is usually realized by adopting a digital technical material printer. Often in the fields of mould manufacture, industrial design, etc., are used to manufacture models, and later gradually in the direct manufacture of some products, parts have been printed using this technique. The technology has application in jewelry, footwear, industrial design, construction, engineering and construction, automotive, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms, and other fields.

In the additive manufacturing process, the metal powder used needs to be dry powder, if the metal powder is wet, the metal powder is difficult to show the required effect, and the powder preheating device for additive manufacturing disclosed in China patent (CN 114367678A) can start the heating mechanism by people though the heating mechanism is arranged, so that the powder is preheated by the heating mechanism, and the preheating effect is realized. But do not solve current metal powder and preheat drying equipment and preheat the dry process to the metal powder, need the manual work to stir the powder evenly, increase people's work load, and do not have airtight space's effect, the metal powder exposes in the air, the metal powder easily with air contact, lead to dust or impurity to fall easily on the metal powder, influence the quality of use of metal powder, simultaneously, use the manual stirring can lead to the metal powder to be heated inhomogeneous problem.

Disclosure of Invention

Based on the above, an object of the present invention is to provide a powder preheating device for additive manufacturing, so as to solve the technical problems set forth in the background above.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a powder preheating device for additive manufacturing, includes the urceolus, the top intercommunication of urceolus has the feed inlet, the lateral wall of urceolus sets up and the heating wire, the top of urceolus is provided with actuating mechanism, actuating mechanism extends to the inside one end fixedly connected with outer tube of urceolus, the inside of outer tube is provided with the auger of being connected with actuating mechanism, multiunit discharge opening has been seted up on the top of outer tube, the inner wall fixedly connected with of urceolus and the grinding mechanism of outer tube connection, the outer wall of outer tube is equipped with the stirring mechanism that turns over that is located the grinding mechanism below, the lateral wall fixedly connected with of urceolus extends to the screening mechanism of urceolus bottom, the bottom of screening mechanism articulates there are two sets of bottom, the bottom fixedly connected with of screening mechanism is located the locking mechanism between two sets of bottom.

Preferably, the driving mechanism comprises an outer cover, an outer shaft, a first bevel gear, an inner shaft, a second bevel gear, a motor and a third bevel gear, wherein the outer cover is fixedly connected to the top end of the outer cylinder, the bottom end of the inner wall of the outer cover is rotationally connected with an outer shaft extending to the inner part of the outer cylinder, one end of the outer shaft positioned in the outer cover is fixedly sleeved with the first bevel gear, the inner wall of the outer shaft is rotationally connected with an inner shaft extending to the inner part of the outer cover, the top end of the inner shaft extends out of the outer shaft and is rotationally connected to the top end of the inner wall of the outer cover, and one end of the inner shaft extending out of the outer shaft is fixedly sleeved with the second bevel gear.

Preferably, the motor that extends to the dustcoat is installed on the top of urceolus, the output fixedly connected with of motor is located the inside No. three bevel gears of dustcoat, no. three bevel gears are located between No. one bevel gears and the two bevel gears, and No. three bevel gears simultaneously with No. one bevel gears and two bevel gears meshing, the one end fixed connection that the outer axle is located the urceolus is on the top of outer tube, the one end that the inner axle is located the outer tube is inside is fixed on the top of auger.

Preferably, the grinding mechanism comprises a rotating plate, a pressing plate and a rough layer, the outer wall of the outer tube is fixedly connected with the rotating plate, the inner wall of the outer tube is fixedly connected with the pressing plate, a group of rough layers are respectively arranged at the top end of the rotating plate and the top end of the pressing plate, gaps exist between the two groups of rough layers, and the inner wall of the rotating plate is provided with another group of heating wires.

Preferably, the stirring mechanism comprises a rotating plate, driven teeth and a gear ring, wherein the outer wall of the outer tube is rotationally connected with one ends of two groups of rotating plates, the other ends of the two groups of rotating plates are respectively and fixedly connected with a group of driven teeth, the inner wall of the outer tube is fixedly connected with the gear ring, and the gear ring is meshed by the two groups of driven teeth.

Preferably, the screening mechanism comprises slide bars, sliding rings, a screen disc, lugs, a pressure plate and a reset spring, wherein two groups of slide bars are fixedly connected to the side wall of the outer cylinder, two groups of slide bars are connected to the outer wall of the slide bars in a sliding manner, the screen disc is fixedly connected to the bottom end of the outer wall of the outer cylinder through a connecting rod, multiple groups of lugs are fixedly connected to the top end of the screen disc, the pressure plate above the screen disc is fixedly connected to the side wall of the outer cylinder, multiple groups of lugs are fixedly connected to the bottom end of the pressure plate, and two groups of reset springs sleeved on the outer wall of the slide bars are fixedly connected to the bottom ends of the slide bars respectively.

Preferably, the bottom cover comprises side plates and stop blocks, two groups of side plates are hinged to the outer wall of the screen disc, and a group of stop blocks are fixedly connected to the bottom ends of the two groups of side plates respectively.

Preferably, the locking mechanism comprises a shell, a stop pin, a second stop pin, a first rack, a second rack, a driving tooth and a rotating rod, wherein the bottom end fixedly connected with of the screen disc is located in the shell between two groups of stop blocks, the inner wall of the shell is slidably connected with the first stop pin which extends to the outside of the shell, the inner wall of the shell is far away from the second stop pin which extends out of the shell in a sliding manner, the first stop pin is located in one end of the shell and fixedly connected with the first rack, and the second stop pin is located in one end of the shell and fixedly connected with the second rack.

Preferably, the inner wall of shell rotates and is connected with the bull stick that extends to the shell outside, the bull stick is located between rack and No. two racks, the fixed cover of outer wall of bull stick is equipped with the initiative tooth that is located between rack and No. two racks, the bull stick is provided with the torsional spring in the junction with the shell, stop pin and No. two stop pin butt respectively at the lateral wall of a set of dog.

In summary, the invention has the following advantages:

according to the invention, through the mutual matching of the outer cylinder, the feeding hole, the heating wire, the driving mechanism, the outer tube, the auger, the discharging hole, the grinding mechanism, the stirring mechanism, the screening mechanism, the bottom cover and the locking mechanism, when the powder preheating device for additive manufacturing is used, the metal powder can be sufficiently stirred so as to be sufficiently heated, and the agglomerated powder remained in the metal powder after the last processing can be avoided, so that the quality of a product can be effectively ensured in the additive manufacturing process.

Drawings

FIG. 1 is a schematic perspective view of an outer cylinder of the present invention;

FIG. 2 is a schematic cross-sectional view of the outer cylinder of the present invention;

FIG. 3 is a schematic diagram of the prescription A of the present invention;

FIG. 4 is a schematic diagram of a B prescription of the present invention;

FIG. 5 is a schematic perspective view of a locking mechanism according to the present invention;

fig. 6 is a schematic cross-sectional view of an outer tube according to the present invention.

In the figure: 1. an outer cylinder; 2. a feed inlet; 3. heating wires; 4. a driving mechanism; 401. an outer cover; 402. an outer shaft; 403. a first bevel gear; 404. an inner shaft; 405. a two-size bevel gear; 406. a motor; 407. a third bevel gear; 5. an outer tube; 6. an auger; 7. a discharge hole; 8. a grinding mechanism; 801. a rotating plate; 802. a pressing plate; 803. a rough layer; 9. a stirring mechanism; 901. a rotating plate; 902. driven teeth; 903. a gear ring; 10. a screening mechanism; 1001. a slide bar; 1002. a slip ring; 1003. a screen tray; 1004. a bump; 1005. a pressure plate; 1006. a return spring; 11. a bottom cover; 1101. a side plate; 1102. a stop block; 12. a locking mechanism; 1201. a housing; 1202. a first limiting pin; 1203. a second limiting pin; 1204. a first rack; 1205. a second rack; 1206. a driving tooth; 1207. and (5) rotating the rod.

Description of the embodiments

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. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

Hereinafter, an embodiment of the present invention will be described in accordance with its entire structure.

Examples

1-6, including urceolus 1, the top intercommunication of urceolus 1 has feed inlet 2, the lateral wall of urceolus 1 sets up with heating wire 3, the top of urceolus 1 is provided with actuating mechanism 4, actuating mechanism 4 extends to the inside one end fixedly connected with outer tube 5 of urceolus 1, the inside auger 6 that is connected with actuating mechanism 4 that is provided with of outer tube 5, multiunit discharge opening 7 has been seted up at the top of outer tube 5, the inner wall fixedly connected with of urceolus 1 is with the grinding mechanism 8 that is connected with outer tube 5, the outer wall of outer tube 5 is equipped with the stirring mechanism 9 that is located grinding mechanism 8 below, the lateral wall fixedly connected with of urceolus 1 extends to the screening mechanism 10 of urceolus 1 bottom, the bottom of screening mechanism 10 articulates there are two sets of bottom covers 11, the bottom fixedly connected with of screening mechanism 10 is located the locking mechanism 12 between two sets of bottom covers 11, stirring mechanism 9 includes turning plate 901, driven tooth 902, gear 903, the outer wall rotation of outer tube 5 is connected with one end of two sets of turning plate 901, the other end fixedly connected with a set of driven tooth 902 respectively, the inner wall fixedly connected with of gear 903 of outer tube 1, simultaneously driven tooth 902 is meshed with two sets of driven tooth 903.

When preheating the metal powder, pour the metal powder into urceolus 1 inside through the charge door, then drive outer tube 5 through actuating mechanism 4 and rotate, outer tube 5 drives two sets of rotating plates 901 and rotates at the rotation in-process, rotating plates 901 drive driven tooth 902 rotation at the pivoted in-process, driven tooth 902 meshes with ring gear 903, so make driven tooth 902 drive rotating plates 901 rotation in rotating plates 901 drive driven tooth 902 pivoted in-process, thereby fully stir the metal powder, the heating wire 3 of urceolus 1 inner wall heats the metal powder of urceolus 1 inside and makes the metal, thereby realize even purpose of preheating the metal powder.

Referring to fig. 1-6, the driving mechanism 4 includes an outer housing 401, an outer shaft 402, a first bevel gear 403, an inner shaft 404, a second bevel gear 405, a motor 406, and a third bevel gear 407, where the outer housing 401 is fixedly connected to the top end of the outer housing 1, the bottom end of the inner wall of the outer housing 401 is rotatably connected with the outer shaft 402 extending into the outer housing 1, one end of the outer shaft 402 located in the outer housing 401 is fixedly sleeved with the first bevel gear 403, the inner wall of the outer shaft 402 is rotatably connected with the inner shaft 404 extending into the outer housing 401, the top end of the inner shaft 404 extends out of the outer shaft 402, and the inner shaft 404 is rotatably connected to the top end of the inner wall of the outer housing 401, and one end of the inner shaft 404 extending out of the outer shaft 402 is fixedly sleeved with the second bevel gear 405.

When the additive manufacturing powder preheating device is used for preheating metal powder, the motor 406 drives the third bevel gear 407 to rotate, the third bevel gear 407 drives the first bevel gear 403 and the second bevel gear 405 to rotate, the first bevel gear 403 and the second bevel gear 405 drive the outer shaft 402 and the inner shaft 404 to rotate respectively, the outer shaft 402 drives the outer tube 5 to rotate, and the inner shaft 404 drives the auger 6 to rotate, so that the outer tube 5 drives the rotating plate 801, the rotating plate 901 and the screen disc 1003 to rotate respectively, and because the first bevel gear 403 is below the third bevel gear 407 and the second bevel gear 405 is above the third bevel gear 407, the rotating directions of the first bevel gear 403 and the second bevel gear 405 are opposite, the rotating directions of the outer shaft 402 and the inner shaft 404 are opposite, and the rotating directions of the outer tube 5 and the auger 6 are opposite.

Referring to fig. 1-6, a motor 406 extending into an outer housing 401 is installed at the top end of an outer cylinder 1, a third bevel gear 407 located in the outer housing 401 is fixedly connected to the output end of the motor 406, the third bevel gear 407 is located between the first bevel gear 403 and the second bevel gear 405, the third bevel gear 407 is meshed with the first bevel gear 403 and the second bevel gear 405 at the same time, one end of an outer shaft 402 located in the outer cylinder 1 is fixedly connected to the top end of an outer tube 5, one end of an inner shaft 404 located in the outer tube 5 is fixed to the top end of an auger 6, a grinding mechanism 8 comprises a rotating plate 801, a pressing plate 802 and a rough layer 803, the outer wall of the outer tube 5 is fixedly connected with the rotating plate 801, the inner wall of the outer cylinder 1 is fixedly connected with the pressing plate 802, a group of rough layers 803 are respectively arranged at the top end of the rotating plate 801 and the top end of the pressing plate 802, gaps exist between the two groups of rough layers 803, a further group of heating wires 3 are arranged on the inner wall of the rotating plate 801, the screening mechanism 10 comprises a slide bar 1001, a sliding ring 1002, a screen disc 1003, a lug 1004, a pressure plate 1005 and a reset spring 1006, wherein two groups of slide bars 1001 are fixedly connected to the side wall of the outer cylinder 1, one group of sliding rings 1002 are slidably connected to the outer wall of the two groups of slide bars 1001, the screen disc 1003 is fixedly connected to the bottom end of the outer wall of the outer cylinder 1 through a connecting rod, a plurality of groups of lugs 1004 are fixedly connected to the top end of the screen disc 1003, the side wall of the outer cylinder 1 is fixedly connected with the pressure plate 1005 positioned above the screen disc 1003, a plurality of groups of lugs 1004 are fixedly connected to the bottom end of the pressure plate 1005, a group of reset springs 1006 sleeved on the outer wall of the slide bars 1001 are respectively and fixedly connected to the bottom ends of the two groups of sliding rings 1002, the bottom cover 11 comprises a side plate 1101 and a stop 1102, the outer wall of the screen disc 1003 is hinged with two groups of side plates 1101, a group of stop 1102 is respectively and fixedly connected to the bottom ends of the two groups of side plates 1101, locking mechanism 12 includes shell 1201, spacer pin 1202 No. two, spacer pin 1203 No. one, rack 1204 No. two, rack 1205 No. two, initiative tooth 1206, bull stick 1207, the bottom fixedly connected with of screen tray 1003 is located the shell 1201 between two sets of dogs 1102, the inner wall sliding connection of shell 1201 has the spacer pin 1202 No. one that extends to the outside of shell 1201, the one end sliding connection of keeping away from spacer pin 1202 of shell 1201 extends the spacer pin 1203 No. two of shell 1201, the one end fixedly connected with of spacer pin 1202 No. one inside shell 1201 No. one, the one end fixedly connected with rack 1205 of No. two of spacer pin 1203 inside shell 1201 No. two, the inner wall rotation of shell 1201 is connected with the bull stick 1207 that extends to the outside of shell 1201, bull stick 1207 is located between rack 1204 No. two racks 1205, the outer wall fixed cover of bull stick 1207 is equipped with the initiative tooth 1206 that is located between rack 1204 and No. two racks 1205, the bull stick 1207 is provided with the torsional spring in the junction with shell 1201, spacer pin 1202 and No. two spacer pins butt respectively at the lateral wall of a set of dogs 1102.

After the metal powder is poured into the inner wall part of the outer cylinder 1, the metal powder slowly enters a gap between two groups of rough layers 803 along the inclined surface at the top end of the pressing plate 802, the rotating plate 801 rotates under the drive of the outer tube 5 so as to grind the metal powder, the metal powder is prevented from being doped with the agglomerated metal powder caused by the previous processing, the metal powder is deposited above the screen disc 1003 after passing through the gap and is continuously stirred by the rotating plate 901, the temperature inside the device is increased under the action of the heating wire 3 so as to preheat the metal powder, after the metal powder is deposited on the screen disc 1003, the metal powder on the screen disc 1003 is conveyed to the top of the outer tube 5 by the rotation of the auger 6 and then discharged from the discharge hole 7 to the upper part of the rotating disc, so that the metal powder is ground once, the fineness of the metal powder is fully ensured, after the metal powder is preheated, the motor 406 is turned off and then the rotating rod 1207 anticlockwise, the rotating rod 1207 drives the driving tooth 1206 to anticlockwise move, the driving tooth 1206 drives the first limiting pin 1202 and the second limiting pin 1203 to be close to each other through the first rack 1204 and the second rack 1205, so that the first limiting pin 1202 and the second limiting pin 1203 cannot block the two groups of stoppers 1102, at the moment, the two groups of side plates 1101 are turned and opened under the driving of self weight, then the rotating rod 1207 is loosened, so that the torsion spring drives the rotating rod 1207 to reset, the first limiting pin 1202 and the second limiting pin 1203 are reset, then the motor 406 is started, the outer tube 5 continues to rotate, the outer tube 5 drives the screen disc 1003 to rotate in the rotating process, the screen disc 1003 rotates on the outer wall of the sliding ring 1002, the bump 1004 is driven to rotate in the rotating process of the screen disc 1003, when the bump 1004 on the screen disc 1003 contacts the bump 1004 on the pressure disc 1005, the screen disc 1003 is pushed to drive the sliding ring 1002 to slide downwards, and compressing the return spring 1006, when the protruding blocks 1004 on the screen disc 1003 are not contacted with the protruding blocks 1004 on the pressing disc 1005, the return spring 1006 pushes the sliding ring 1002 to reset so that the screen disc 1003 is reset, the screen disc 1003 continuously shakes up and down to screen metal powder, the caked metal powder is screened down, then the caked metal powder is conveyed to the rotating plate 801 by the auger 6 again to be ground, after preheated metal powder is screened out by the screen disc 1003, the two groups of side plates 1101 are turned over to drive the two groups of stop blocks 1102 to turn over, in the process, the two groups of stop blocks 1102 are respectively contacted with the first stop pin 1202 and the second stop pin 1203, so that the first stop pin 1202 and the second stop pin 1203 are pushed to slide towards the inside of the outer shell 1201 by the two groups of stop blocks 1102, the first stop pin 1204 and the second stop pin 1205 are moved, the first stop pin 1204 and the second stop pin 1205 drive the rotating rod 1207 to turn over through the driving teeth 1206, and after the two groups of stop pins 1102 completely slide over the first stop pin 1202 and the second stop pin 1203, the torsion spring 1207 is driven to reset, and the first stop pin 1202 and the second stop pin 1203 cannot be blocked by the first stop pin 1202 and the second stop pin 1203.

Examples

When the preheating device is used, when metal powder is preheated, the metal powder is poured into the outer cylinder 1 through the charging hole, then the outer tube 5 is driven to rotate through the driving mechanism 4, the outer tube 5 drives the two groups of rotating plates 901 to rotate in the rotating process, the rotating plates 901 drive driven teeth 902 to rotate in the rotating process, and the driven teeth 902 are meshed with the gear ring 903, so that the driven teeth 902 drive the rotating plates 901 to rotate in the rotating process of the driven teeth 902 driven by the rotating plates 901, the metal powder is fully stirred, and the electric heating wires 3 on the inner wall of the outer cylinder 1 heat the metal powder in the outer cylinder 1 to enable the metal powder, so that the aim of uniformly preheating the metal powder is fulfilled.

Although embodiments of the invention have been shown and described, the detailed description is to be construed as exemplary only and is not limiting of the invention as the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples, and modifications, substitutions, variations, etc. may be made in the embodiments as desired by those skilled in the art without departing from the principles and spirit of the invention, provided that such modifications are within the scope of the appended claims.

Claims

1. The utility model provides a powder preheating device for additive manufacturing, includes urceolus (1), its characterized in that: the novel grinding device is characterized in that a driving mechanism (4) is arranged at the top end of the outer barrel (1), one end of the driving mechanism (4) extending to the inside of the outer barrel (1) is fixedly connected with an outer pipe (5), an auger (6) connected with the driving mechanism (4) is arranged inside the outer pipe (5), a grinding mechanism (8) connected with the outer pipe (5) is fixedly connected with the inner wall of the outer barrel (1), and a stirring mechanism (9) located below the grinding mechanism (8) is arranged on the outer wall of the outer pipe (5).

2. A powder preheating device for additive manufacturing according to claim 1, characterized in that: the top intercommunication of urceolus (1) has feed inlet (2), the lateral wall of urceolus (1) sets up and heating wire (3), multiunit discharge opening (7) have been seted up on the top of outer tube (5), the lateral wall fixedly connected with of urceolus (1) extends to screening mechanism (10) of urceolus (1) bottom, the bottom of screening mechanism (10) articulates there are two sets of bottom (11), the bottom fixedly connected with of screening mechanism (10) is located locking mechanism (12) between two sets of bottom (11), actuating mechanism (4) include dustcoat (401), outer axle (402), first bevel gear (403), interior axle (404), two bevel gears (405), motor (406), no bevel gear (407), the outer cover (401) is fixedly connected with the top end of the outer cylinder (1), the bottom end of the inner wall of the outer cover (401) is rotationally connected with an outer shaft (402) extending to the inside of the outer cylinder (1), one end of the outer shaft (402) positioned in the outer cover (401) is fixedly sleeved with a first bevel gear (403), the inner wall of the outer shaft (402) is rotationally connected with an inner shaft (404) extending to the inside of the outer cover (401), the top end of the inner shaft (404) extends out of the outer shaft (402) and is rotationally connected with the top end of the inner wall of the outer cover (401), one end of the inner shaft (404) extending out of the outer shaft (402) is fixedly sleeved with a two-bevel gear (405).

3. A powder preheating device for additive manufacturing according to claim 2, characterized in that: the motor (406) extending to the inside of dustcoat (401) is installed on the top of urceolus (1), the output fixedly connected with of motor (406) is located three number bevel gears (407) of dustcoat (401) inside, no. three bevel gears (407) are located between No. one bevel gears (403) and two bevel gears (405), and No. three bevel gears (407) are simultaneously with No. one bevel gears (403) and two bevel gears (405) meshing, the one end fixed connection that outer axle (402) are located the inside of urceolus (1) is on the top of outer tube (5), the one end that inner axle (404) are located the inside of outer tube (5) is fixed on the top of auger (6).

4. A powder preheating device for additive manufacturing according to claim 1, characterized in that: grinding mechanism (8) are including rotating board (801), clamp plate (802), coarse layer (803), the outer wall fixedly connected with rotating board (801) of outer tube (5), the inner wall fixed connection clamp plate (802) of urceolus (1), the top of rotating board (801) and the top of clamp plate (802) are provided with a set of coarse layer (803) respectively, and have the space between two sets of coarse layers (803), the inner wall of rotating board (801) is provided with another set of heating wire (3).

5. A powder preheating device for additive manufacturing according to claim 1, characterized in that: the stirring mechanism (9) comprises a rotating plate (901), driven teeth (902) and a gear ring (903), wherein the outer wall of the outer tube (5) is rotationally connected with one ends of two groups of rotating plates (901), the other ends of the two groups of rotating plates (901) are respectively fixedly connected with one group of driven teeth (902), the inner wall of the outer tube (1) is fixedly connected with the gear ring (903), and the gear ring (903) is meshed by two groups of driven teeth (902).

6. A powder preheating device for additive manufacturing according to claim 1, characterized in that: screening mechanism (10) include slide bar (1001), slip ring (1002), sieve dish (1003), lug (1004), pressure disk (1005), reset spring (1006), the lateral wall fixedly connected with two sets of slide bars (1001) of urceolus (1), two sets of outer wall sliding connection of slide bar (1001) has a set of slip ring (1002), the lateral wall sliding connection of slip ring (1002) has sieve dish (1003), sieve dish (1003) pass through connecting rod fixed connection in the outer wall bottom of urceolus (5), the top fixedly connected with multiunit lug (1004) of sieve dish (1003), the lateral wall fixedly connected with of urceolus (1) is located pressure disk (1005) of sieve dish (1003) top, the bottom of pressure disk (1005) also fixedly connected with multiunit lug (1004), two sets of reset spring (1006) of being set up at slide bar (1001) outer wall are respectively fixedly connected with to the bottom of slip ring (1002).

7. The powder preheating device for additive manufacturing according to claim 6, wherein: the bottom cover (11) comprises side plates (1101) and stop blocks (1102), two groups of side plates (1101) are hinged to the outer wall of the screen disc (1003), and a group of stop blocks (1102) are fixedly connected to the bottom ends of the two groups of side plates (1101) respectively.

8. The powder preheating device for additive manufacturing according to claim 7, wherein: locking mechanism (12) are including shell (1201), spacer pin (1202), no. two spacer pins (1203), no. one rack (1204), no. two racks (1205), initiative tooth (1206), bull stick (1207), the bottom fixedly connected with of sieve dish (1003) is located shell (1201) between two sets of dogs (1102), the inner wall sliding connection of shell (1201) has a spacer pin (1202) that extends to shell (1201) outside, the inner wall of shell (1201) is kept away from one end sliding connection of spacer pin (1202) and is extended No. two spacer pins (1203) of shell (1201), one end fixedly connected with No. one rack (1204) that spacer pin (1202) is located the inside of shell (1201), one end fixedly connected with No. two racks (1205) that No. two spacer pins (1203) are located the inside of shell (1201).

9. The powder preheating device for additive manufacturing according to claim 8, wherein: the inner wall rotation of shell (1201) is connected with bull stick (1207) that extends to shell (1201) outside, bull stick (1207) are located between rack (1204) and No. two racks (1205), the fixed cover of outer wall of bull stick (1207) is equipped with initiative tooth (1206) that are located between rack (1204) and No. two racks (1205), bull stick (1207) are provided with the torsional spring in the junction with shell (1201), stop pin (1202) and No. two stop pins (1203) butt respectively at the lateral wall of a set of dog (1102).