Powder stirring and feeding device with sealing component

Abstract

The invention discloses a powder stirring and feeding device with a sealing part, and belongs to the technical field of metal powder metallurgy. The powder feeding device comprises a powder feeding barrel, a stirrer, a stirrer sealing device, a powder feeding disc, a powder feeding disc motor and a powder feeding channel. The stirrer is located in the center of the powder feeding barrel and connected with the stirrer motor through the coupler, in the powder conveying process, the stirrer always keeps rotating, it is guaranteed that powder cannot be blocked at the position of a powder falling scraper blade hole, and the stirrer cannot interfere with the powder falling scraper blade in the rotating operation process. The stirrer motor is fixed to the powder feeding barrel upper cover and located in the stirrer sealing device, it is guaranteed that the interior of the powder feeding device is completely sealed in the powder feeding process, and finally powder is conveyed out from the powder feeding channel through the powder feeding disc. The stirrer continuously rotates in the powder feeding barrel, adsorption agglomeration of powder in the powder tank body is damaged, smoothness and continuity of a powder feeding channel in the powder conveying process are guaranteed, and continuous and stable output of the powder is achieved.

Description

Technical Field

[0001] This invention relates to the field of metal powder metallurgy technology, and in particular to a powder feeding device for conveying powders with small particle size, low density, and easy clogging during thermal spraying, specifically a stirring powder feeding device with a sealing component. Background Technology

[0002] In the thermal spraying process, the particle size and uniformity of the powder have a significant impact on the coating quality. When the powder particle size is large, the powder has good flowability and is easy to transport, but the powder is not easy to completely melt during the heating process of thermal spraying, which will form voids in the coating and reduce the performance of the coating. When the powder particle size is small, the powder melting effect will be significantly improved.

[0003] However, the smaller the particle size of the powder, the larger its specific surface area. When the powder is stationary or continuously conveyed, it is highly susceptible to adsorption and agglomeration due to the combined effects of powder gravity, sliding friction between powder particles, electrostatic adsorption between powder particles, and van der Waals forces. This significantly reduces powder flowability, greatly increasing the difficulty of powder conveying, and in severe cases, it can even block the powder delivery pipeline, preventing powder delivery. This phenomenon is particularly severe for ceramic powders with low density, such as titanium dioxide or alumina powders.

[0004] Currently, the commonly used powder feeders in engineering mainly include rotary powder feeders, scraper powder feeders, vibrating powder feeders, and fluidized bed powder feeders. When using a rotary powder feeder to convey fine powder, the powder feeding holes on the rotary table are easily clogged by powder, preventing powder output. When using a scraper powder feeder to convey fine powder, the powder outlet is easily clogged by powder, preventing powder output. When using a vibrating powder feeder to convey fine powder, the vibration device can continuously output powder, but the powder conveying amount is unstable, fluctuating with the vibration frequency, which can significantly affect the spraying effect. When using a fluidized bed powder feeder to convey fine powder, it can maintain a stable powder conveying state when conveying spherical powder, but for crushed powder, the poor powder flowability during the conveying process will cause fluctuations in the powder conveying amount, affecting the spraying effect. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a stirring and powder feeding device with a sealing component to stably transport powder with small particle size, light density and easy clogging.

[0006] The objective of this invention is achieved through the following technical solution: a mixing and powder feeding device with a sealing component, comprising: a powder feeding tank, a mixer, a mixer sealing device, a powder feeding tray, a powder feeding tray motor, and a powder feeding channel; The powder feeding hopper includes a top cover, a flange, a straight section, a lower conical section, a connecting screw, and a gas connection pipe. The top cover and flange are connected by threads. The connecting screw is assembled through a through hole on the flange and a threaded hole on the lower conical section, thereby pressing and fixing the flange, straight section, and lower conical section. The gas connection pipe is fixed inside the lower conical section. The mixer includes a mixing head, a mixing rod, a mixer motor, and a motor cable; one end of the mixing rod is fixedly connected to the motor shaft of the mixing head and is located inside the powder feeding hopper, and the other end is fixedly connected to the mixer motor. The mixer motor is fixed above the powder feeding hopper and connected to the motor cable. The agitator sealing device includes a sealing barrel, a sealing cover, and a sealing screw; the sealing screw is assembled with the through hole on the sealing cover through a threaded hole on the powder feeding barrel cover, so that the sealing barrel, the sealing cover, and the powder feeding barrel cover are pressed and fixed; the sealing cover has a motor cable channel. The powder feeding tray includes a rotating powder feeding tray, a powder feeding tray cover, and a powder feeding tray base. The rotating powder feeding tray is disposed inside the powder feeding tray base and connected to the powder feeding tray motor. The rotating powder feeding tray is provided with a powder feeding tray trough, and a powder dropping scraper and a powder feeding scraper are fixedly fixed in the powder feeding tray. The powder dropping scraper and the powder feeding scraper are respectively provided with powder dropping scraper holes and powder feeding scraper holes. The powder feeding tray cover is fixedly connected to the powder feeding tray base, and the powder feeding tray cover is provided with through holes, which are respectively connected to the powder feeding bucket and the powder feeding channel to press and fix the powder dropping scraper and the powder feeding scraper. The powder feeding tray cover is provided with an air inlet pipe connector, which is connected to an air inlet pipe.

[0007] Furthermore, the powder feeding hopper also includes a powder feeding hopper sealing ring and a powder feeding hopper top cover sealing ring; the powder feeding hopper sealing ring is located on the contact end face between the straight section of the powder feeding hopper and the powder feeding hopper flange, and on the contact end face between the straight section of the powder feeding hopper and the lower conical section of the powder feeding hopper; the powder feeding hopper top cover sealing ring is located on the contact end face between the powder feeding hopper top cover and the powder feeding hopper flange.

[0008] Furthermore, the lower conical section of the powder feeding hopper is provided with a protrusion for fixing the powder scraper.

[0009] Furthermore, the stirrer also includes a stirring head fixing sleeve set screw, a coupling, a motor fixing bracket, a motor fixing bolt, a stirring head fixing sleeve, and a coupling set screw; the stirring rod and the stirring head are fixedly connected by the stirring head fixing sleeve and the stirring head fixing sleeve set screw; the stirring rod and the motor shaft of the stirrer motor are fixedly connected by the coupling and the coupling set screw; the stirrer motor is fixed to the powder feeding hopper cover by the motor fixing bracket and the motor fixing bolt.

[0010] Furthermore, the agitator sealing device also includes a sealing gasket, which is disposed between the sealing barrel and the powder delivery barrel cover, and between the sealing barrel and the sealing cover.

[0011] Furthermore, after the motor cable passes through the motor cable channel, the hole is sealed with adhesive.

[0012] Furthermore, the powder feeding tray also includes a powder feeding tray sealing ring, which is disposed between the powder feeding tray cover and the powder feeding tray base.

[0013] Furthermore, the lowest plane of the stirring head is lower than the upper plane of the powder scraper hole, and the optimal position is flush with the center height of the powder scraper hole. If the lowest plane of the stirring head is higher than the upper plane of the powder scraper hole, the powder will not agglomerate above the rotation path of the stirring head. If the lowest plane of the stirring head is between the lower plane of the stirring head and the lower plane of the powder scraper hole, the powder may still agglomerate and block, thus preventing normal powder delivery. The shape of the stirring head is specially designed to ensure that the rotation diameter of the lowest point of the stirring head is smaller than the width of the powder scraper hole, ensuring that it will not interfere with the powder scraper during rotation. The stirring head and the stirring rod are connected together by the stirring head fixing sleeve and the stirring head fixing set screw. When the powder feeding device continuously delivers some powders with high hardness, such as titanium nitride and titanium carbide, the stirring head will wear. When the stirring head is severely worn, it can be replaced simply by removing the stirring head.

[0014] Furthermore, during operation, the powder feeding disc rotates along with the powder feeding disc motor. Powder falls from the powder scraper hole into the powder trough of the powder feeding disc. As the powder feeding disc rotates, the powder reaches the powder feeding scraper hole and is transported out through the powder feeding channel under the action of the air pressure inside the powder feeding device.

[0015] Furthermore, the powder feeding channel includes a powder feeding tray and powder feeding pipe connecting block, a powder feeding pipe connector, and a powder feeding pipe; the powder feeding tray and powder feeding pipe connecting block is fixedly connected to the powder feeding tray cover, and a protrusion is provided below the powder feeding tray and powder feeding pipe connecting block for fixing the powder feeding scraper; the powder feeding pipe connector is fixedly connected to the powder feeding tray and powder feeding pipe connecting block, and the powder feeding pipe connector is a quick-connect connector, which, after being connected to the powder feeding pipe, conveys powder to the target position.

[0016] The technical solution provided by this invention may include the following beneficial effects: 1. This invention adjusts the position of the lower end face of the stirring head at the foremost end of the stirrer, designs the shape of the stirring head, and reasonably sets the stirring speed to ensure that the powder in the powder feeding tank can continuously and stably fall into the powder trough of the powder feeding disc through the powder scraper hole. As the powder feeding disc rotates, the powder is finally conveyed out through the powder scraper hole and the powder feeding channel.

[0017] 2. By installing a mixer sealing device on the mixer, the powder feeding device is completely sealed. During the thermal spraying operation, the powder conveying will not be affected by a small amount of air leakage in the motor gap, ensuring a stable conveying process.

[0018] 3. This invention can ensure the continuous and stable delivery of powder with a particle size of 10μm or larger during the thermal spraying process. Using finer powder particles for spraying can result in a denser coating, making it easier to obtain a high-quality, high-performance coating. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the powder feeding device of the present invention; Figure 2 This is a schematic diagram of the powder feeding hopper structure of the present invention; Figure 3 This is a schematic diagram of the stirrer structure of the present invention; Figure 4 This is a schematic diagram of the agitator sealing device of the present invention; Figure 5 This is a schematic diagram of the powder feeding tray, powder feeding tray motor, and powder feeding channel of the present invention; Figure 6 This is a schematic diagram showing the positions of the air inlet pipe of the powder feeding tray, the powder feeding channel, and the powder feeding bucket of the present invention.

[0020] Figure label: 100 Powder delivery hopper, 200 Agitator, 300 Agitator sealing device, 400 Powder delivery tray, 500 Powder delivery tray motor, 600 Powder delivery channel; 101 Powder delivery hopper top cover, 102 Powder delivery hopper flange, 103 Powder delivery hopper straight section, 104 Powder delivery hopper lower conical section, 105 Connecting screw, 106 Powder delivery hopper sealing ring, 107 Powder delivery hopper top cover sealing ring, 108 Powder delivery hopper gas connection pipe; 201 Agitator head, 202 Agitator rod, 203 Agitator head fixing sleeve set screw, 204 Coupling, 205 Agitator motor, 206 Motor cable, 207 Motor fixing bracket, 208 Motor fixing screw 209 Stirring head fixing sleeve; 210 Coupling set screw; 301 Sealing barrel; 302 Sealing washer; 303 Sealing cover; 304 Sealing screw; 305 Motor cable channel; 401 Rotary powder feeding disc; 402 Powder feeding disc cover; 403 Powder feeding disc base; 404 Powder dropping scraper; 405 Powder feeding scraper; 406 Powder feeding disc powder trough; 407 Powder dropping scraper hole; 408 Powder feeding scraper hole; 409 Air inlet pipe connector; 410 Air inlet pipe; 411 Powder feeding disc sealing ring; 412 Powder feeding disc fastening bolt; 601 Powder feeding disc powder feeding pipe connecting block; 602 Powder feeding pipe connector; 603 Powder feeding pipe. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the invention will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0022] Furthermore, the accompanying drawings are merely illustrative diagrams of the present invention and are not drawn to scale; some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0023] like Figure 1 As shown in the figure, an embodiment of the present invention provides a mixing and powder feeding device with a sealing component, including: a powder feeding tank 100, a stirrer 200, a stirrer sealing device 300, a powder feeding tray 400, a powder feeding tray motor 500, and a powder feeding channel 600.

[0024] The powder feeding hopper 100 includes a powder feeding hopper top cover 101, a powder feeding hopper flange 102, a powder feeding hopper straight section 103, a powder feeding hopper lower conical section 104, a connecting screw 105, and a powder feeding hopper gas connection pipe 108. The powder feeding hopper top cover 101 and the powder feeding hopper flange 102 are connected by threads. The connecting screw 105 is assembled through a through hole on the powder feeding hopper flange 102 and a threaded hole on the powder feeding hopper lower conical section 104, so that the powder feeding hopper flange 102, the powder feeding hopper straight section 103, and the powder feeding hopper lower conical section 104 are pressed and fixed. The powder feeding hopper gas connection pipe 108 is fixed inside the powder feeding hopper lower conical section 104.

[0025] The stirrer 200 includes a stirring head 201, a stirring rod 202, a stirrer motor 205, and a motor cable 206; one end of the stirring rod 202 is fixedly connected to the stirring head 201 and is disposed inside the powder feeding tank 100, and the other end is fixedly connected to the stirrer motor 205. The stirrer motor 205 is fixed above the powder feeding tank 100 and is connected to the motor cable 206.

[0026] The agitator sealing device 300 includes a sealing barrel 301, a sealing cover 303, and a sealing screw 304. The sealing screw 304 is assembled with the through hole on the powder feeding barrel cover 101 through the threaded hole on the sealing cover 303, so that the sealing barrel 301, the sealing cover 303, and the powder feeding barrel cover 101 are pressed and fixed. The sealing cover 303 has a motor cable channel 305, through which the motor cable 206 extends out of the agitator sealing device 300 and is connected to the power source to provide power to the agitator motor 205.

[0027] The powder feeding tray 400 includes a rotating powder feeding tray 401, a powder feeding tray cover 402, and a powder feeding tray base 403. The rotating powder feeding tray 401 is disposed inside the powder feeding tray base 403 and is connected to the powder feeding tray motor 500. The rotating powder feeding tray 401 has a rectangular groove along the circumferential direction, which is the powder feeding tray powder groove 406. A powder dropping scraper 404 and a powder feeding scraper 405 are fixed in the powder feeding tray powder groove 406, and powder dropping scrapers are respectively opened in the powder dropping scraper 404 and the powder feeding scraper 405. The plate has a hole 407 and a powder feeding scraper hole 408; the powder feeding tray cover 402 is fixedly connected to the powder feeding tray base 403, and the powder feeding tray cover 402 has a through hole, which is respectively connected to the powder feeding bucket 100 and the powder feeding channel 600 to press and fix the powder falling scraper 404 and the powder feeding scraper 405; the powder feeding tray cover 402 is provided with an air inlet pipe connector 409, so that the air inlet pipe 410 is connected to the gas connection pipe 108 of the powder feeding bucket, providing powder feeding gas for the entire powder feeding device. The commonly used powder feeding gases are mainly compressed air and argon.

[0028] As a preferred embodiment, such as Figure 2 As shown, the powder feeding hopper 100 also includes a powder feeding hopper sealing ring 106 and a powder feeding hopper top cover sealing ring 107. The powder feeding hopper sealing ring 106 is located on the contact end face between the straight section 103 of the powder feeding hopper and the flange 102 of the powder feeding hopper, and on the contact end face between the straight section 103 of the powder feeding hopper and the lower conical section 104 of the powder feeding hopper. The powder feeding hopper top cover sealing ring 107 is located on the contact end face between the top cover 101 of the powder feeding hopper and the flange 102 of the powder feeding hopper, to ensure the sealing between the three parts of the powder feeding hopper 100. Preferably, the lower conical section 104 of the powder feeding hopper is provided with a protrusion for fixing the powder falling scraper 404.

[0029] The powder delivery hopper cover 101 has a through hole on its upper surface for the motor shaft of the agitator motor 205 to pass through. The upper surface also has two sets of eight threaded holes, four in each set. One set of threaded holes mates with the motor fixing bolt 208 to secure the agitator motor 205, and another set mates with the sealing screw 304 to secure the agitator sealing device 300. The lower conical section 104 of the powder delivery hopper has a vertically upward threaded hole for assembly with the powder delivery hopper gas connection pipe 108. The lower end of the threaded hole connects to a horizontal circular hole, which communicates with the powder delivery disc 400, ensuring that the gas pressure inside the powder delivery hopper 100 is the same as the pressure inside the powder delivery disc 400.

[0030] As a preferred embodiment, such as Figure 3As shown, the stirrer 200 also includes a stirring head fixing sleeve set screw 203, a coupling 204, a motor fixing bracket 207, a motor fixing bolt 208, a stirring head fixing sleeve 209, and a coupling set screw 210; the powder feeding rod 202 is relatively long and directly reaches the lower position of the lower conical section 104 of the powder feeding barrel. The stirring rod 202 and the stirring head 201 are fixedly connected by the stirring head fixing sleeve 209 and the stirring head fixing sleeve set screw 203; the motor shaft of the stirrer motor 205 passes through the through hole on the powder feeding barrel cover 101 and extends into the powder feeding barrel, and is fixedly connected to the stirring rod 202 by the coupling 204 and the coupling set screw 210; the stirrer motor 205 is fixed to the powder feeding barrel cover 101 by the motor fixing bracket 207 and the motor fixing bolt 208.

[0031] Sealant is applied to the through-hole on the outside of the powder feeding hopper cover 101 to prevent the very small amount of powder inside the powder feeding hopper 100 from leaking out through the through-hole. The lower plane of the installed stirring head 201 is lower than the upper plane of the powder falling scraper hole. The optimal position is that it is level with the center height of the powder falling scraper hole. When the stirring head 201 rotates in this position, it breaks up any agglomerates or blockages that may form in the powder falling scraper hole 407, allowing the powder to fall into the powder trough of the powder feeding tray.

[0032] As a preferred embodiment, such as Figure 4 As shown, the agitator sealing device 300 also includes a sealing gasket 302, which is disposed between the sealing barrel 301 and the powder delivery barrel cover 101, and between the sealing barrel 301 and the sealing cover 303, to ensure the sealing performance of the agitator sealing device.

[0033] The sealing cover 303 has four through holes. The sealing screw 304 is assembled with a set of four threaded holes on the powder delivery barrel cover 101 through the through holes. After tightening, the sealing cover 303 and the sealing barrel 301 are pressed onto the powder delivery barrel cover 101. A through hole is opened on the sealing cover 303 as a motor cable channel 305. After the mixer cable 206 passes through, the hole is sealed with glue to ensure the overall sealing performance of the mixer sealing device 300. No air leakage will occur during the operation of the mixer motor.

[0034] As a preferred embodiment, such as Figure 5 As shown, the powder feeding tray 400 also includes a powder feeding tray sealing ring 411, which is disposed between the powder tray cover 402 and the powder feeding tray base 403 to ensure good sealing of the powder feeding tray.

[0035] Both scrapers have protrusions underneath that mate with the powder trough 406 of the powder feeding tray. When the powder feeding tray 400 is in operation, the rotating powder feeding tray 401 rotates in a fixed direction along with the powder feeding tray motor 500. Since the two scrapers are pressed down by the powder feeding tray cover 402, they do not move with the rotating powder feeding tray 401. Instead, they are constrained by the protrusions at the lower ends of the scrapers that mate with the powder trough 406 of the powder feeding tray. The lower ends of the two scrapers are always inside the powder trough 406 of the powder feeding tray, ensuring that the powder falls from the powder falling scraper hole 407 into the powder trough. As the powder feeding tray trough 406 rotates, the powder reaches the powder feeding scraper hole 408. Under the action of the air pressure inside the powder feeding device, the powder is conveyed out through the powder feeding channel 600.

[0036] As a preferred embodiment, such as Figure 6 As shown, the powder feeding channel mainly consists of a powder feeding tray and powder feeding pipe connecting block 601, a powder feeding pipe connector 602, and a powder feeding pipe 603. The powder feeding tray and powder feeding pipe connecting block 601 is located on the powder feeding tray cover 402 and is fixed together with the powder feeding tray cover 402. The lower end of the powder feeding tray and powder feeding pipe connecting block 601 protrudes to fix the powder feeding scraper 405 when the powder feeding tray cover 402 is pressed. The upper end of the powder feeding tray and powder feeding pipe connecting block 601 is connected to the powder feeding pipe connector 602. The powder feeding pipe connector 602 is a quick-connect connector. After being connected to the powder feeding pipe 603, it can transport the powder to the center position of the flame of the spraying equipment to provide powder material for the spraying operation.

[0037] In a preferred embodiment, the operation of the device is as follows: First, open the top cover 101 of the powder feeding hopper, pour the powder into the powder feeding hopper 100, and then tighten the top cover 101. Then, turn on the power supply to the stirrer motor 205 and the powder feeding disc motor 500 respectively, open the air inlet valve 410 to allow powder feeding gas at a certain pressure to enter the powder feeding device. The powder feeding gas pressure is approximately 0.6 MPa, and the powder feeding gas flow rate is adjusted to 15-18 L / min.

[0038] Start the agitator motor 205 and adjust its speed to 6-10 r / min. At this time, the gas in the powder delivery pan is connected to the powder delivery tank 100 through the powder delivery tank gas connection pipe 108, and the gas pressure in the powder delivery device remains consistent. The agitator head 201 rotates below the upper end face of the powder falling scraper 404, disrupting the equilibrium state of the powder. Under the action of gravity, the powder in the powder delivery tank continuously and stably falls into the powder trough 406 of the powder delivery pan through the powder falling scraper hole 407. As the powder delivery pan 401 rotates, the powder is finally conveyed out through the powder delivery scraper hole 408 and the powder delivery channel 600.

[0039] The agitator speed should not be too high; a speed of 6-10 r / min can ensure continuous and stable powder delivery. If the speed is lower than this range, the powder delivery in the powder delivery trough may be interrupted when the rotating powder delivery disc rotates at a high speed, resulting in discontinuous powder delivery. If the speed is higher than this range, the output torque of the agitator motor increases, which may overload the motor when there is a large amount of powder in the powder delivery hopper, causing the actual speed to decrease and potentially affecting the motor's service life.

[0040] For example, when using the above-mentioned powder feeding device to convey Al2O3 powder (powder particle size of 10μm-25μm), the powder feeding rate is 605g / h when the powder feeding disc speed is 5r / min; and 954g / h when the powder feeding disc speed is 8r / min. When using the above-mentioned powder feeding device to convey TiO2 powder (powder particle size of 10μm-25μm), the powder feeding rate is 2439g / h when the powder feeding disc speed is 10r / min; and 3542g / h when the powder feeding disc speed is 15r / min.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stirring and powder feeding device with a sealing component, characterized in that, include: Powder feeding hopper (100), mixer (200), mixer sealing device (300), powder feeding tray (400), powder feeding tray motor (500) and powder feeding channel (600). The powder delivery hopper (100) includes a powder delivery hopper cover (101), a powder delivery hopper flange (102), a powder delivery hopper straight section (103), a powder delivery hopper lower conical section (104), a connecting screw (105), and a powder delivery hopper gas connection pipe (108). The powder delivery hopper cover (101) and the powder delivery hopper flange (102) are connected by threads. The connecting screw (105) is assembled through the through hole on the powder delivery hopper flange (102) and the threaded hole on the powder delivery hopper lower conical section (104), so that the powder delivery hopper flange (102), the powder delivery hopper straight section (103), and the powder delivery hopper lower conical section (104) are pressed and fixed. The powder delivery hopper gas connection pipe (108) is fixed inside the powder delivery hopper lower conical section (104). The stirrer (200) includes a stirring head (201), a stirring rod (202), a stirrer motor (205), and a motor cable (206); one end of the stirring rod (202) is fixedly connected to the stirring head (201) and is located inside the powder delivery hopper (100), and the other end is fixedly connected to the motor shaft of the stirrer motor (205). The stirrer motor (205) is fixed above the powder delivery hopper (100) and connected to the motor cable (206); The agitator sealing device (300) includes a sealing barrel (301), a sealing cover (303), and a sealing screw (304); the sealing screw (304) is assembled with the through hole on the sealing cover (303) through the threaded hole on the powder feeding barrel cover (101), so that the sealing barrel (301), the sealing cover (303), and the powder feeding barrel cover (101) are pressed and fixed; the sealing cover (303) has a motor cable channel (305). The powder feeding tray (400) includes a rotating powder feeding tray (401), a powder feeding tray cover (402), and a powder feeding tray base (403); the rotating powder feeding tray (401) is disposed inside the powder feeding tray base (403) and is connected to the powder feeding tray motor (500); the rotating powder feeding tray (401) is provided with a powder feeding tray trough (406), and a powder dropping scraper (404) and a powder feeding scraper (405) are respectively fixed in the powder feeding tray trough (406), and the powder dropping scraper (404) and the powder feeding scraper (405) are respectively fixed in the powder feeding tray trough (406). The scraper (405) has a powder dropping scraper hole (407) and a powder feeding scraper hole (408) respectively; the powder feeding tray cover (402) is fixedly connected to the powder feeding tray base (403), and the powder feeding tray cover (402) has a through hole, which is connected to the powder feeding bucket (100) and the powder feeding channel (600) respectively, to press and fix the powder dropping scraper (404) and the powder feeding scraper (405); the powder feeding tray cover (402) is provided with an air inlet pipe connector (409), which is connected to the air inlet pipe (410).

2. The apparatus according to claim 1, characterized in that, The powder feeding hopper (100) also includes a powder feeding hopper sealing ring (106) and a powder feeding hopper top cover sealing ring (107); the powder feeding hopper sealing ring (106) is located on the contact end face between the powder feeding hopper straight section (103) and the powder feeding hopper flange (102), and on the contact end face between the powder feeding hopper straight section (103) and the powder feeding hopper lower conical section (104); the powder feeding hopper top cover sealing ring (107) is located on the contact end face between the powder feeding hopper top cover (101) and the powder feeding hopper flange (102).

3. The apparatus according to claim 1, characterized in that, The lower conical section (104) of the powder feeding hopper is provided with a protrusion for fixing the powder scraper (404).

4. The apparatus according to claim 1, characterized in that, The agitator (200) also includes a stirring head fixing sleeve set screw (203), a coupling (204), a motor fixing bracket (207), a motor fixing bolt (208), a stirring head fixing sleeve (209), and a coupling set screw (210); the stirring rod (202) and the stirring head (201) are fixedly connected by the stirring head fixing sleeve (209) and the stirring head fixing sleeve set screw (203); the stirring rod (202) and the motor shaft of the agitator motor (205) are fixedly connected by the coupling (204) and the coupling set screw (210); the agitator motor (205) is fixed to the powder feeding bucket cover (101) by the motor fixing bracket (207) and the motor fixing bolt (208).

5. The apparatus according to claim 1, characterized in that, The agitator sealing device (300) further includes a sealing gasket (302), which is located between the sealing barrel (301) and the powder delivery barrel cover (101), and between the sealing barrel (301) and the sealing cover (303).

6. The apparatus according to claim 1, characterized in that, After the motor cable (206) passes through the motor cable channel (305), the hole is sealed with adhesive.

7. The apparatus according to claim 1, characterized in that, The powder feeding tray (400) also includes a powder feeding tray sealing ring (411), which is located between the powder tray cover (402) and the powder feeding tray base (403).

8. The apparatus according to claim 1, characterized in that, The bottom plane of the stirring head (201) is lower than the upper plane of the powder scraper hole (407).

9. The apparatus according to claim 1, characterized in that, During operation, the powder feeding disc (401) rotates with the powder feeding disc motor (500). Powder falls from the powder scraper hole (407) into the powder trough (406) of the powder feeding disc. As the powder feeding disc (401) rotates, the powder reaches the powder feeding scraper hole (408). Under the action of the air pressure inside the powder feeding device, the powder is conveyed out through the powder feeding channel (600).

10. The apparatus according to claim 1, characterized in that, The powder feeding channel (600) includes a powder feeding tray and powder feeding pipe connecting block (601), a powder feeding pipe connector (602), and a powder feeding pipe (603); the powder feeding tray and powder feeding pipe connecting block (601) is fixedly connected to the powder feeding tray cover (402), and a protrusion is provided below the powder feeding tray and powder feeding pipe connecting block (601) for fixing the powder feeding scraper (405); the powder feeding pipe connector (602) is fixedly connected to the powder feeding tray and powder feeding pipe connecting block (601), and the powder feeding pipe connector (602) is a quick-connect connector. After being connected to the powder feeding pipe (603), it conveys powder to the target position.

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