A powder feeding device and powder feeding system

Abstract

This invention discloses a powder feeding device and system. The powder feeding device includes: a gearbox with a receiving space, and a powder inlet, a powder outlet, and a powder discharge outlet communicating with the receiving space; a drive mechanism is installed in the gearbox; a helical gear disposed in the receiving space and connected to the drive mechanism, the drive mechanism driving the helical gear to rotate; the helical gear has a plurality of through holes arranged at an angle to the end face of the helical gear in its tooth grooves; and a venting spindle disposed inside the helical gear, the venting spindle having a powder feeding air hole corresponding to the powder discharge outlet and a powder discharge air hole corresponding to the powder discharge outlet. This powder feeding device can effectively prevent powder residue from remaining in the tooth grooves. Through the structural layout of the venting spindle, helical gear, receiving space, powder inlet, powder outlet, powder discharge air hole, powder feeding air hole, and powder discharge outlet, as well as the geometric characteristics of the helical gear itself, the stability, accuracy, continuity, and reliability of the powder feeding process can be significantly improved, meeting the stringent requirements of modern high-precision manufacturing processes.

Description

Technical Field

[0001] This invention relates to a powder feeding device and a powder feeding system, belonging to the field of powder conveying technology. Background Technology

[0002] In the field of powder conveying technology, precise and stable powder conveying is a key factor in ensuring product quality and production efficiency. Gear-type powder feeders are widely used due to their simple structure, ease of control, and adjustable powder delivery rate. However, existing gear-type powder feeders have a significant inherent drawback: due to the geometric characteristics of the gear teeth, powder particles are easily trapped in the gear tooth gaps (grooves) during the conveying process. This leads to the following problems:

[0003] 1. Fluctuation in powder delivery: Residual powder in the toothed groove occupies the space that should accommodate new powder, causing unpredictable changes in the actual amount of powder delivered. When the residual amount is unstable, the amount of powder carried away each time also fluctuates.

[0004] 2. Poor powder feeding stability: The fluctuation in powder feeding caused by tooth groove residue is continuous and periodic, which directly leads to a significant reduction in the stability of the entire powder feeding process, making it difficult to achieve long-term, high-precision quantitative powder feeding.

[0005] 3. Impact on product quality: In applications requiring precise control of powder supply, instability in powder delivery directly affects the dimensional accuracy, mechanical properties, and internal quality of the final product, leading to a decrease in product qualification rate or even scrapping.

[0006] 4. Increased maintenance requirements: Residual powder may accumulate and harden, requiring frequent shutdowns for cleaning, which affects the continuous operation time and production efficiency of the equipment.

[0007] Although the industry has tried to alleviate the powder residue problem by improving gear materials to reduce adhesion, optimizing tooth shape such as increasing tooth root radius, and adding scrapers, these methods are often limited in effect, increase structural complexity and cost, and cannot fundamentally solve the problem of powder residue in the dead corner area of ​​the tooth groove.

[0008] There is currently no effective solution to the aforementioned problems in the existing technology. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides a powder feeding device and a powder feeding system. This powder feeding device can effectively prevent powder residue from remaining in the tooth grooves, significantly improving the stability, accuracy, continuity, and reliability of the powder feeding process, and meeting the stringent requirements of modern high-precision manufacturing processes.

[0010] In a first aspect, the present invention provides a powder feeding device, comprising:

[0011] A gearbox is provided with a receiving space, and a powder inlet, a powder outlet and a powder discharge outlet communicating with the receiving space. The gearbox is equipped with a drive mechanism.

[0012] A helical gear is disposed in the receiving space and connected to the driving mechanism. The driving mechanism is used to drive the helical gear to rotate. The tooth groove of the helical gear is provided with a plurality of through holes arranged at an inclination to the end face of the helical gear.

[0013] A ventilation spindle is disposed inside the helical gear. The ventilation spindle has a powder feeding air hole corresponding to the powder outlet and a powder discharge air hole corresponding to the powder discharge outlet.

[0014] The ventilation spindle is internally connected to external gas. Powder enters the helical gear groove from the powder inlet. The drive mechanism drives the helical gear to rotate, thereby moving the powder. When the powder moves to the powder outlet, the gas passes through the interior of the ventilation spindle, the powder feeding air hole, and the through hole of the helical gear groove, feeding the powder in the helical gear groove into the powder outlet. When the powder in the helical gear groove that is not fed into the powder outlet moves to the powder discharge air hole as the helical gear rotates, the gas passes through the interior of the ventilation spindle, the powder discharge air hole, and the through hole of the helical gear groove, feeding the powder in the helical gear groove that is not fed into the powder outlet into the powder discharge hole.

[0015] In one embodiment of the present invention, the cross-sectional areas of the powder feeding vent and the powder discharging vent increase from the inside of the ventilation shaft to the outside of the ventilation shaft.

[0016] In one embodiment of the present invention, the through hole includes an inner conical hole disposed on the inner surface of the helical gear, an outer conical hole disposed on the outer surface of the helical gear, and a channel connecting the inner conical hole and the outer conical hole; the cross-sectional area of ​​the inner conical hole decreases from the inner surface of the helical gear to the outer surface of the helical gear, and the cross-sectional area of ​​the outer conical hole increases from the inner surface of the helical gear to the outer surface of the helical gear.

[0017] In one embodiment of the present invention, the output end of the drive mechanism is fixedly connected to the helical gear via a flange, a bearing is installed between the helical gear and the ventilation main shaft, and a shaft seal is installed between the end of the helical gear away from the flange and the gearbox.

[0018] In one embodiment of the present invention, the powder outlet is connected to a powder outlet connector; the venting spindle is connected to a gas connector.

[0019] In one embodiment of the present invention, the ventilation spindle, the helical gear, and the accommodating space are coaxial.

[0020] In one embodiment of the present invention, the powder inlet is located above the helical gear, the powder outlet is located below the helical gear, and the powder outlet vent is coaxial with the powder outlet; the powder outlet is located on one side of the helical gear, and the powder feeding vent is coaxial with the powder outlet; a plurality of through holes arranged at an inclination to the end face of the helical gear are provided in each tooth groove of the helical gear, rotating between the powder feeding vent and the powder outlet, and between the powder outlet vent and the powder outlet.

[0021] In one embodiment of the present invention, the powder discharge port of the gearbox is connected to a waste powder recycling box, the powder inlet of the gearbox is connected to a funnel, and the funnel is connected to an openable and closable sealing cover by a clamp.

[0022] In one embodiment of the present invention, a sieve is installed inside the funnel, and a plurality of vibrating elements are installed outside the funnel.

[0023] Secondly, the present invention provides a powder feeding system, including the powder feeding device described above.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention provides a powder feeding device and system. A drive mechanism continuously rotates a helical gear to move the powder continuously. When the powder carried by the helical gear rotates to the vicinity of the powder outlet, gas from the venting shaft blows the powder through the powder feeding vent and the through-holes in the helical gear tooth grooves, feeding the powder from the helical gear tooth grooves into the powder outlet. A small amount of residual powder that is not completely blown into the powder outlet moves with the helical gear as it rotates to the powder discharge vent. Through gravity and the gas from the venting shaft passing through the powder discharge vent and the through-holes in the helical gear tooth grooves, this small amount of residual powder is blown into the waste powder recovery box through the powder discharge port, assisting in the recovery of waste powder from the helical gear tooth grooves. This effectively prevents powder residue from remaining in the tooth grooves, fundamentally solving the problem of powder residue in the dead zones of the tooth grooves. By repeating this process, the powder feeding device can achieve continuous and stable powder feeding operations. Furthermore, this powder feeding device, through the structural layout of the venting main shaft, helical gear, receiving space, powder inlet, powder outlet, powder outlet vent, powder feeding vent, and powder outlet, as well as the geometric characteristics of the helical gear itself—that is, each tooth groove of the helical gear is provided with a row of several through holes arranged at an angle—ensures that every time the helical gear rotates by one tooth pitch angle, the through hole at the end of the current tooth groove and the through hole at the front of the next tooth groove are simultaneously purged by gas. This achieves continuous and uninterrupted powder feeding operations, significantly improving the stability, accuracy, continuity, and reliability of the powder feeding process, avoiding fluctuations in powder feeding volume, ensuring the final product quality, solving the problem of frequent shutdowns for cleaning caused by the hardening of residual powder, improving the continuous operating time and production efficiency of the equipment, and meeting the stringent requirements of modern high-precision manufacturing processes. Attached Figure Description

[0026] Figure 1 This is a perspective view of the powder feeding device provided in an embodiment of the present invention.

[0027] Figure 2 This is a front view of the powder feeding device provided in an embodiment of the present invention.

[0028] Figure 3 This is a side view of the powder feeding device provided in an embodiment of the present invention.

[0029] Figure 4 for Figure 3 Sectional view along direction AA.

[0030] Figure 5 A side view of a gearbox provided in an embodiment of the present invention.

[0031] Figure 6 This is an isometric sectional view of a gearbox provided in an embodiment of the present invention.

[0032] Figure 7 A cross-sectional view of a gearbox provided in an embodiment of the present invention.

[0033] Figure 8 This is a cross-sectional view of the internal structure of a gearbox provided in an embodiment of the present invention.

[0034] Figure 9 This is an internal structural diagram of a gearbox provided in an embodiment of the present invention.

[0035] Figure 10 This is an internal structural diagram of a gearbox without helical gears, provided as an embodiment of the present invention.

[0036] Figure 11 A perspective view of a helical gear provided in an embodiment of the present invention.

[0037] In the diagram: 1. Gearbox; 11. Drive mechanism; 12. Powder inlet; 13. Powder outlet; 14. Powder outlet connector; 15. Powder outlet; 16. Flange; 17. Shaft seal; 18. Bearing; 19. Accommodation space; 2. Helical gear; 20. Through hole; 21. Channel; 22. Inner conical hole; 23. Outer conical hole; 3. Funnel; 4. Vibrating element; 5. Sealing cover; 6. Clamp; 7. Waste powder recovery box; 8. Screen; 9. Ventilation spindle; 91. Gas connector; 92. Powder feeding vent; 93. Powder discharge vent. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; or connections within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] Please refer to Figures 1 to 11 This invention provides a powder feeding device, which includes:

[0042] Gearbox 1 is provided with a receiving space 19, and a powder inlet 12, a powder outlet 13 and a powder outlet 15 communicating with the receiving space 19. The gearbox 1 is equipped with a drive mechanism 11.

[0043] Helical gear 2 is disposed in the receiving space 19 and connected to the driving mechanism 11. The driving mechanism 11 is used to drive the helical gear 2 to rotate. The tooth groove of the helical gear 2 is provided with a plurality of through holes 20 arranged at an inclination to the end face of the helical gear 2.

[0044] A ventilation shaft 9 is disposed inside the helical gear 2. The ventilation shaft 9 has a powder feeding air hole 92 corresponding to the powder outlet 15 and a powder discharge air hole 93 corresponding to the powder discharge outlet 13.

[0045] The ventilation shaft 9 is connected to an external gas source. Powder enters the helical gear 2 through the powder inlet 12 and is driven by the drive mechanism 11 to rotate the helical gear 2 and move the powder. When the powder moves to the powder outlet 15, the gas passes through the interior of the ventilation shaft 9, the powder feeding hole 92, and the through hole 20 of the helical gear 2, feeding the powder in the helical gear 2 into the powder outlet 15. When the powder in the helical gear 2 that is not fed into the powder outlet 15 rotates with the helical gear 2 and moves to the powder discharge hole 93, the gas passes through the interior of the ventilation shaft 9, the powder discharge hole 93, and the through hole 20 of the helical gear 2, feeding the powder in the helical gear 2 that is not fed into the powder outlet 15 into the powder discharge hole 13.

[0046] It should be noted that the number of teeth and the inclination angle of the helical gear 2 can be designed according to the actual powder to be transported, and the present invention does not impose specific limitations on this.

[0047] Please refer to Figure 6 and Figure 7 In some embodiments, the cross-sectional areas of the powder feeding vent 92 and the powder discharging vent 93 increase from the inside of the ventilation main shaft 9 to the outside of the ventilation main shaft 9.

[0048] In this embodiment, by setting powder feeding holes 92 and powder discharging holes 93 with cross-sectional areas increasing from the inside to the outside of the ventilation shaft 9, the inner diameters of the powder feeding holes 92 and 93 increase from the inside to the outside of the ventilation shaft 9. This increasing hole diameter configuration reduces flow resistance and pressure drop, effectively lowering the gas velocity. Lower velocity means less friction loss and turbulence intensity, thus significantly reducing the resistance and pressure loss of gas flowing through the holes. This effectively reduces the energy consumption of the gas source, maintains stable gas pressure, and ensures effective gas delivery. Simultaneously, this increasing hole diameter configuration increases gas flow rate; larger holes allow for greater gas flow, enabling high-flow-rate powder delivery and significantly improving the powder blowing effect in the tooth grooves.

[0049] Please refer to Figure 11 In some embodiments, the through hole 20 includes an inner conical hole 22 disposed on the inner surface of the helical gear 2, an outer conical hole 23 disposed on the outer surface of the helical gear 2, and a channel 21 connecting the inner conical hole 22 and the outer conical hole 23; the cross-sectional area of ​​the inner conical hole 22 decreases from the inner surface of the helical gear 2 to the outer surface of the helical gear 2, and the cross-sectional area of ​​the outer conical hole 23 increases from the inner surface of the helical gear 2 to the outer surface of the helical gear 2.

[0050] In this embodiment, the cross-sectional area of ​​the outer conical hole 23 increases from the inner surface of the helical gear 2 to the outer surface of the helical gear 2, and the cross-sectional area of ​​the channel 21 is equal to the minimum cross-sectional area of ​​the outer conical hole 23. This arrangement serves to block the powder, effectively preventing the powder from falling into the interior of the gear 2 from the outer conical hole 23 and the channel 21, thereby ensuring the stable and reliable operation of the device. In addition, the cross-sectional area of ​​the inner conical hole 22 decreases from the inner surface of the helical gear 2 to the outer surface of the helical gear 2, and the cross-sectional area of ​​the channel 21 is equal to the minimum cross-sectional area of ​​the inner conical hole 22. This arrangement can effectively increase the airflow velocity, prevent powder sedimentation, enhance dispersion, and the high-speed airflow can provide stronger kinetic energy. The high-speed airflow can evenly disperse the powder, avoid local accumulation, and improve the blowing effect on the powder in the tooth groove. Furthermore, the high-speed airflow generates strong turbulence and shear force in the contraction section, which can break up powder agglomerates, improve dispersion uniformity, avoid clogging of the through hole 20, and improve conveying reliability.

[0051] Please refer to Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 In some embodiments, the output end of the drive mechanism 11 is fixedly connected to the helical gear 2 via a flange 16, a bearing 18 is installed between the helical gear 2 and the ventilation main shaft 9, and a shaft seal 17 is installed between the end of the helical gear 2 away from the flange 16 and the gearbox 1.

[0052] In this embodiment, the side of the helical gear 2 is sealed by the shaft seal 17, ensuring that gas only passes through the through hole 20, preventing gas leakage, and thus ensuring the effective blowing of gas into the powder in the tooth groove of the helical gear 2. A bearing 18 is installed between the helical gear 2 and the ventilation shaft 9. The ventilation shaft 9 is fixed, and the helical gear 2 rotates around the ventilation shaft 9 via the bearing 18. The drive mechanism 11 drives the rotation of the helical gear 2 through the flange 16; the drive mechanism 11 can be a rotating device such as a motor.

[0053] In some embodiments, the powder outlet 15 is connected to a powder outlet connector 14; the venting spindle 9 is connected to a gas connector 91.

[0054] In this embodiment, the powder outlet 15 is connected to the powder collection device via the powder outlet connector 14, and the powder is collected by the powder collection device. The end of the venting spindle 9 away from the flange 16 is connected to a gas connector 91, and the venting spindle 9 is connected to a gas source via the gas connector 91, thereby introducing external gas.

[0055] In some embodiments, the ventilation spindle 9, the helical gear 2, and the accommodating space 19 are coaxial.

[0056] In some embodiments, the powder inlet 12 is located above the helical gear 2, the powder outlet 13 is located below the helical gear 2, and the powder outlet vent 93 is coaxial with the powder outlet 13; the powder outlet 15 is located on one side of the helical gear 2, and the powder feeding vent 92 is coaxial with the powder outlet 15; a plurality of through holes 20 arranged at an inclination to the end face of the helical gear 2 are provided in each tooth groove of the helical gear 2, and rotate between the powder feeding vent 92 and the powder outlet 15, and between the powder outlet vent 93 and the powder outlet 13.

[0057] The powder feeding device provided by this invention, through the structural layout of the ventilation shaft 9, helical gear 2, accommodating space 19, powder inlet 12, powder outlet 13, powder outlet vent 93, powder feeding vent 92, and powder outlet 15, as well as the geometric structural characteristics of the helical gear 2 itself, namely, each tooth groove of the helical gear 2 is provided with a row of several through holes 20 arranged at an inclined angle, so that every time the helical gear 2 rotates by an angle of tooth pitch, the through hole 20 at the end of the current tooth groove and the through hole 20 at the front of the next tooth groove are simultaneously blown by gas, thereby realizing continuous and uninterrupted powder feeding operation, significantly improving the stability, accuracy, continuity and reliability of the powder feeding process, and meeting the stringent requirements of modern high-precision manufacturing processes.

[0058] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 In some embodiments, the powder discharge port 13 of the gearbox 1 is connected to a waste powder recycling box 7, the powder inlet 12 of the gearbox 1 is connected to a funnel 3, and the funnel 3 is connected to an openable and closable sealing cover 5 by a clamp 6.

[0059] Optionally, a screen 8 is installed inside the funnel 3, and a plurality of vibrating elements 4 are installed outside the funnel 3.

[0060] When the powder feeding device is working, the powder in the funnel 3 will pass evenly through the sieve 5 under the vibration of the vibrating element 4 and fall onto the helical gear 2 for feeding. The helical gear 2 is connected to the drive mechanism 11. Under the drive of the drive mechanism 11, the helical gear 2 will rotate continuously to drive the powder to move continuously. When the powder carried by the helical gear 2 rotates to the vicinity of the powder outlet 15, the gas in the ventilation shaft 9 will blow the powder through the powder feeding air hole 92 and the through hole 20 of the helical gear 2 tooth groove, sending the powder in the helical gear 2 tooth groove into the powder outlet 15; a small amount of residual powder in the helical gear 2 tooth groove that is not completely blown into the powder outlet 15 moves with the rotation of the helical gear 2 to the powder discharge air hole 93. Under the action of gravity, and the gas in the ventilation shaft 9 passing through the powder discharge air hole 93 and the through hole 20 of the helical gear 2 tooth groove, the small amount of residual powder in the helical gear 2 tooth groove that is not sent into the powder outlet 15 is blown into the waste powder recovery box 7 through the powder discharge port 13, assisting in the recovery of waste powder in the helical gear 2 tooth groove. By repeating this process, the powder feeding device can achieve continuous and stable powder feeding operation.

[0061] In summary, the powder feeding device provided by the present invention drives the helical gear 2 to rotate continuously through the drive mechanism 11, thereby driving the powder to move continuously. When the powder carried by the helical gear 2 rotates to the vicinity of the powder outlet 15, the gas in the ventilation shaft 9 will blow the powder through the powder feeding air hole 92 and the through hole 20 of the helical gear 2 tooth groove, sending the powder in the helical gear 2 tooth groove into the powder outlet 15. A small amount of residual powder in the helical gear 2 tooth groove that is not completely blown into the powder outlet 15 moves with the rotation of the helical gear 2 to the powder discharge air hole 93. Through gravity and the gas in the ventilation shaft 9 passing through the powder discharge air hole 93 and the through hole 20 of the helical gear 2 tooth groove, the small amount of residual powder in the helical gear 2 tooth groove that is not sent into the powder outlet 15 is blown into the waste powder recovery box 7 through the powder discharge port 13, which helps to complete the waste powder recovery in the helical gear 2 tooth groove. This can effectively prevent powder from remaining in the tooth groove and fundamentally solve the problem of powder remaining in the dead corner area of ​​the tooth groove. By repeating this process, the powder feeding device can achieve continuous and stable powder feeding operation. Furthermore, the powder feeding device, through the structural layout of the ventilation shaft 9, helical gear 2, accommodating space 19, powder inlet 12, powder outlet 13, powder outlet vent 93, powder feeding vent 92, and powder outlet 15, as well as the geometric characteristics of the helical gear 2 itself, namely, each tooth groove of the helical gear 2 is provided with a row of several through holes 20 arranged at an inclined angle, so that every time the helical gear 2 rotates by an angle of tooth pitch, the through hole 20 at the end of the current tooth groove and the through hole 20 at the front of the next tooth groove are simultaneously blown by gas, thereby realizing continuous and uninterrupted powder feeding operation, significantly improving the stability, accuracy, continuity and reliability of the powder feeding process, avoiding fluctuations in powder feeding volume, ensuring the final product quality, solving the problem of frequent shutdowns for cleaning caused by the hardening of residual powder, improving the continuous operation time and production efficiency of the equipment, and meeting the stringent requirements of modern high-precision manufacturing processes.

[0062] Furthermore, embodiments of the present invention also provide a powder feeding system, which includes the powder feeding device described above. Because the powder feeding system uses any of the powder feeding devices described above, it possesses all the advantages mentioned above.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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. Such 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, and should all be included within the protection scope of the present invention.

Claims

1. A powder delivery device, characterized by include: The gearbox (1) is provided with a receiving space (19) and a powder inlet (12), a powder outlet (13) and a powder outlet (15) communicating with the receiving space (19). The gearbox (1) is equipped with a drive mechanism (11). A helical gear (2) is disposed in the receiving space (19) and connected to the driving mechanism (11). The driving mechanism (11) is used to drive the helical gear (2) to rotate. The tooth groove of the helical gear (2) is provided with a plurality of through holes (20) arranged at an inclination to the end face of the helical gear (2). A ventilation spindle (9) is installed inside the helical gear (2). The ventilation spindle (9) has a powder feeding air hole (92) corresponding to the powder outlet (15) and a powder discharge air hole (93) corresponding to the powder discharge outlet (13). The ventilation shaft (9) is connected to external gas. Powder enters the tooth groove of the helical gear (2) from the powder inlet (12). The drive mechanism (11) drives the helical gear (2) to rotate, thereby moving the powder. When the powder moves to the powder outlet (15), the gas passes through the interior of the ventilation shaft (9), the powder feeding hole (92), and the through hole (20) of the tooth groove of the helical gear (2), delivering the powder in the tooth groove of the helical gear (2). The powder that was not fed into the powder outlet (15) is fed into the powder outlet (15) as the helical gear (2) rotates and moves to the powder discharge vent (93). The gas passes through the interior of the ventilation shaft (9), the powder discharge vent (93), and the through hole (20) of the helical gear (2) to feed the powder that was not fed into the powder outlet (15) into the powder discharge port (13).

2. The powder delivery apparatus of claim 1, wherein The cross-sectional areas of the powder feeding vent (92) and the powder discharging vent (93) increase from the inside of the ventilation main shaft (9) to the outside of the ventilation main shaft (9).

3. The powder delivery apparatus of claim 1, wherein The through hole (20) includes an inner conical hole (22) disposed on the inner surface of the helical gear (2), an outer conical hole (23) disposed on the outer surface of the helical gear (2), and a channel (21) connecting the inner conical hole (22) and the outer conical hole (23); the cross-sectional area of ​​the inner conical hole (22) decreases from the inner surface of the helical gear (2) to the outer surface of the helical gear (2), and the cross-sectional area of ​​the outer conical hole (23) increases from the inner surface of the helical gear (2) to the outer surface of the helical gear (2).

4. The powder delivery apparatus of claim 1, wherein The output end of the drive mechanism (11) is fixedly connected to the helical gear (2) through the flange (16). A bearing (18) is installed between the helical gear (2) and the ventilation main shaft (9). A shaft seal (17) is installed between the end of the helical gear (2) away from the flange (16) and the gearbox (1).

5. The powder delivery apparatus of claim 1, wherein The powder outlet (15) is connected to a powder outlet connector (14); the ventilation spindle (9) is connected to a gas connector (91).

6. The powder delivery apparatus of claim 1, wherein The ventilation spindle (9), the helical gear (2), and the accommodating space (19) are coaxial.

7. The powder delivery apparatus of claim 1, wherein The powder inlet (12) is located above the helical gear (2), the powder outlet (13) is located below the helical gear (2), and the powder outlet vent (93) is coaxial with the powder outlet (13); the powder outlet (15) is located on one side of the helical gear (2), and the powder feeding vent (92) is coaxial with the powder outlet (15); a number of through holes (20) arranged at an inclination to the end face of the helical gear (2) are provided in each tooth groove of the helical gear (2), and rotate between the powder feeding vent (92) and the powder outlet (15), and between the powder outlet vent (93) and the powder outlet (13).

8. The powder delivery apparatus of claim 1, wherein The powder discharge port (13) of the gearbox (1) is connected to a waste powder recycling box (7), and the powder inlet (12) of the gearbox (1) is connected to a funnel (3). The funnel (3) is connected to an openable and closable sealing cover (5) by a clamp (6).

9. The powder delivery apparatus of claim 8, wherein, A screen (8) is installed inside the funnel (3), and several vibrating elements (4) are installed outside the funnel (3).

10. A powder delivery system characterized by, Includes the powder feeding device according to any one of claims 1-9.

Images