CN210175167U

CN210175167U - Powder filling machine and metering device thereof

Info

Publication number: CN210175167U
Application number: CN201920714451.XU
Authority: CN
Inventors: Niansheng Yang; 阳年生; Xiongzhong Li; 李雄忠
Original assignee: Changsha Fangjin Technology Co ltd
Current assignee: Changsha Fangjin Technology Co ltd
Priority date: 2019-05-18
Filing date: 2019-05-18
Publication date: 2020-03-24
Anticipated expiration: 2029-05-18

Abstract

The utility model provides a powder filling machine and a metering device used for the powder filling machine, wherein the metering device comprises a mounting seat, a hopper, a powder feeding block, a metering base, a driving mechanism and a metering block which can move back and forth, and the powder feeding block is provided with a first channel and a powder passing hole; the metering block is in contact seal with the lower surface of the powder inlet block and is provided with a powder storage hole and a second channel; the lower surface of the metering block is in contact seal with a metering base, the metering base is provided with an air inlet channel and a filling hole, and the air inlet channel is provided with a filter element; when the metering block reaches the feeding position, the powder storage hole is matched with the powder passing hole and the air inlet channel, and powder in the hopper falls into the powder storage hole and is filled; when the metering block is located at the discharging position, the powder storage hole is matched with the first channel, the powder storage hole is matched with the filling hole, the second channel is matched with the first channel and the air inlet channel, and all powder in the powder storage hole is filled after passing through the filling hole. The powder material output each time is determined, namely, the metering is accurate, and no dust exists outside in the metering process.

Description

Powder filling machine and metering device thereof

Technical Field

The utility model relates to a equipment for packing technical field has specifically related to a metering device in powder liquid filling machine and the mainly used powder filling technology.

Background

In the powder filling process, the powder is divided into portions of a predetermined quantity, which are filled into containers to be filled. In the process, it is very important to measure a certain amount of powder, and dust is easy to generate in the process, so that environmental pollution and resource waste are caused. Therefore, how to improve and optimize the structure of the metering device to make the metering device accurately measure and not easily generate dust in the filling process is an important technical problem which needs to be solved urgently by the technical personnel in the field.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

Disclosure of Invention

The utility model aims at providing a metering device, the measurement when making this metering device be used for the powder filling is accurate, and the precision is higher, is difficult for producing the dust simultaneously, the utility model discloses a still another purpose provides the powder liquid filling machine who uses above-mentioned metering device.

Therefore, the utility model relates to a metering device, which comprises a mounting seat, a hopper, a powder feeding block, a metering base and a driving mechanism, wherein the hopper is arranged on the mounting seat, the powder feeding block is arranged on the mounting seat or the hopper, and the metering base is arranged on the mounting seat or the powder feeding block or the hopper; wherein the content of the first and second substances,

the powder feeding block is provided with a first channel with an inlet and an outlet on the lower surface, and a powder passing hole which is matched with the discharge hole of the hopper and penetrates through the upper surface and the lower surface of the powder feeding block; the metering block is arranged between the powder feeding block and the metering base in a back-and-forth moving mode, the upper surface of the metering block is in contact sealing with the lower surface of the powder feeding block, and the lower surface of the metering block is in contact sealing with the upper surface of the metering base; the metering block is provided with a powder storage hole and a second channel which penetrate through the upper surface and the lower surface, the metering base is provided with an air inlet channel and a vertical filling hole, and a filter element is arranged at an outlet of the air inlet channel;

the driving mechanism comprises a linear bearing arranged on the mounting seat, a traction shaft matched with the linear bearing and connected with the metering block, a guide pillar, a fixture block and a power source, the fixture block is slidably arranged on the guide pillar and connected with the traction shaft, and the fixture block is driven by the power source to reciprocate;

when the metering block moves forwards to a discharging position, an inlet of the powder storage hole is matched with an outlet of the first channel, an outlet of the powder storage hole is matched with the filling hole, an outlet of the second channel is matched with the inlet of the first channel, and an inlet of the second channel is matched with an outlet of the air inlet channel; when the metering block moves backwards to the feeding position, the inlet of the powder storage hole is matched with the outlet of the powder passing hole, and the outlet of the powder storage hole is matched with the outlet of the air inlet channel.

Preferably, the upper portion of the filter element is flush with the outlet of the air inlet passage.

Preferably, a filter element seat is arranged in the air inlet channel, and the filter element is arranged on the upper portion of the filter element seat.

Preferably, the powder feeding block is provided with a plurality of regularly arranged powder passing holes, and the powder storage holes, the second channel, the first channel, the filling holes and the air inlet channel are also provided with corresponding numbers.

Preferably, the powder passing hole is a cylindrical hole; or the powder passing hole is a conical hole with a larger lower part; or the powder passing hole is a combination of two cylindrical holes with a smaller upper part and a larger lower part; or the powder passing hole is a combination of two cylindrical holes with smaller upper parts and larger lower parts and a transitional conical hole; or the powder passing hole is a combination of a downward conical hole and a downward cylindrical hole, and the major diameter of the conical hole is the same as that of the cylindrical hole. Wherein, the conical holes can be replaced by horn holes.

Preferably, the powder storage hole is a cylindrical hole; or the powder storage hole is a conical hole with a larger lower part; or the powder storage hole is a combination of two cylindrical holes with a smaller upper part and a larger lower part; or the powder storage hole is a combination of two cylindrical holes with a smaller upper part and a larger lower part and a transitional conical hole; or the powder storage hole is a combination of a downward conical hole and a downward cylindrical hole, and the major diameter of the conical hole is the same as that of the cylindrical hole. Wherein, the conical holes can be replaced by horn holes.

Preferably, the first channel comprises a first vertical cylindrical hole, a second vertical cylindrical hole and a first horizontal cylindrical hole communicating the first vertical cylindrical hole and the second vertical cylindrical hole, and the first vertical cylindrical hole is an inlet of the first channel; or the first channel is formed by two crossed cylindrical holes and is in an inverted V shape; or the first channel is in an inverted U shape; or the first channel is a first groove, and two ends of the groove are respectively used as an inlet and an outlet of the first channel.

Preferably, the second channel comprises a third vertical cylindrical hole and a U-shaped second groove communicated with the bottom of the third vertical cylindrical hole, and the second groove is not communicated with the powder storage hole; or the second channel is two intersected and obliquely arranged cylindrical holes; or the second channel is a spiral pore canal.

Preferably, the filling hole is a cylindrical hole; or the filling hole is a conical hole with a larger lower part; or the filling hole is a combination of two cylindrical holes with a smaller upper part and a larger lower part; or the filling hole is a combination of two cylindrical holes with smaller upper parts and larger lower parts and a transitional conical hole; or the filling hole is a combination of a downward conical hole and a downward cylindrical hole, and the major diameter of the conical hole is the same as that of the cylindrical hole. Wherein, the conical holes can be replaced by horn holes.

Preferably, the hopper comprises a hopper body and a connecting seat, and the outlet of the hopper is positioned on the connecting seat.

Preferably, the mounting seat comprises a pair of supporting arms arranged in parallel, the powder feeding block is mounted above the pair of supporting arms, the metering base is mounted below the pair of supporting arms, and the metering block is located between the pair of supporting arms.

Furthermore, the utility model discloses still relate to a powder liquid filling machine, this powder liquid filling machine includes among the above-mentioned arbitrary technical scheme metering device.

Compared with the background art, the beneficial effects of the utility model are roughly as follows.

The utility model relates to a metering device, which comprises a mounting seat, a hopper, a powder feeding block, a metering base and a metering block, wherein the hopper, the powder feeding block, the metering base and the metering block can move back and forth are arranged on the mounting seat; the upper surface of the metering block is in contact seal with the lower surface of the powder inlet block, and the metering block is provided with a powder storage hole and a second channel which penetrate through the upper surface and the lower surface; the upper surface of the metering base is in contact seal with the lower surface of the metering block, and is provided with an air inlet channel and a vertical filling hole, and a filter element is arranged at the outlet of the air inlet channel; when the metering block moves backwards to the feeding position, the inlet of the powder storage hole is matched with the outlet of the powder passing hole, the outlet of the powder storage hole is matched with the outlet of the air inlet channel, and at the moment, powder in the hopper falls into the powder storage hole through the powder hole and is filled; when the metering block moves forwards to the discharging position, the inlet of the powder storage hole is matched with the outlet of the first channel, the outlet of the powder storage hole is matched with the filling hole, the outlet of the second channel is matched with the inlet of the first channel, the inlet of the second channel is matched with the outlet of the air inlet channel, and the air is filled after the powder in the powder storage hole is blown down completely through the filling hole through the second channel and the first channel. The powder storage hole is filled with powder each time, then the powder in the powder storage hole is blown down completely for subsequent operation such as filling, so that the powder output each time is determined, namely the metering is accurate, and no external dust is generated in the metering process.

The objects, features and solutions of the present invention can be applied jointly or independently in any combination. Not all objects or features may be required to be combined in each claim.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a partially exploded perspective view of a metering device according to an embodiment of the present invention.

Fig. 2 is a schematic view in partial longitudinal section of the metering device provided in fig. 1, illustrating the state of the metering block in the outfeed position.

Fig. 3 is a schematic partial cross-sectional view of an alternative embodiment of the powder inlet block provided in fig. 1 and 2.

Fig. 4 is a schematic cross-sectional view of a cross-section of the powder inlet block of fig. 3.

Fig. 5 is a schematic perspective view of an alternative embodiment of the gauge block provided in fig. 1 and 2.

FIG. 6 is a schematic diagram in plan view and partial section of the gauge block of FIG. 5.

Fig. 7 is a schematic sectional view a-a in fig. 6.

Fig. 8 is a schematic top view of the metering base provided in fig. 1 and 2.

Fig. 9 is a schematic sectional view B-B in fig. 8.

Fig. 10 is a schematic cross-sectional view of C-C in fig. 8.

Fig. 11 is a schematic side view of an alternative embodiment of the cartridge holder provided in fig. 1 and 2.

Fig. 12 is a schematic cross-sectional view of fig. 11 taken along line D-D.

Fig. 13 is a top view of fig. 11.

Fig. 14 is a schematic perspective view of an alternative embodiment of the cartridge provided in fig. 11.

Fig. 15 is a top view of fig. 14.

Detailed Description

In order to make the technical solutions related to the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that, in a non-conflicting manner, the embodiments and the specific features described in the embodiments in the present application may be combined in any suitable manner; in order to avoid unnecessary repetition, the present invention does not separately describe every possible combination of components, and should be considered as the disclosure of the present invention as long as the combination does not violate the spirit of the present invention.

In a specific embodiment, as shown in fig. 1 and 2, the present invention provides a metering device, which comprises a mounting base 10, a hopper 20, a powder feeding block 30, a metering block 40, and a metering base 50, wherein the hopper 20 is disposed on the mounting base 10. Referring to fig. 1 and 2, the powder feeding block 30 is fastened to the mounting base 10, the metering base 50 is fastened to the mounting base 10, and the metering block 40 is movably disposed between the powder feeding block 30 and the metering base 50 in a back-and-forth manner.

As shown in fig. 1 to 4, the powder feeding block 30 includes an upper surface 31 and a lower surface 32, a first passage 33, and a powder passing hole 34, wherein an inlet 331 and an outlet 332 of the first passage 33 are both on the lower surface 32, and the powder passing hole 34 is matched with the discharge port 21 of the hopper 20 and penetrates through the upper surface 31 and the lower surface 32 of the powder feeding block 30.

As shown in fig. 1 and 2, and 5 to 7, the metering block 40 has a powder storage hole 43 and a second passage 44 penetrating the upper surface 41 and the lower surface 42. Referring to fig. 1 and 2, the upper surface 41 of the metering block 40 is in contact seal with the lower surface 32 of the powder feed block 30, and the lower surface 42 of the metering block 40 is in contact seal with the upper surface 51 of the metering base 50.

As shown in fig. 1 and 2, and 8-10, the metering base 50 is provided with an air inlet passage 52 and a vertical filling aperture 53. As shown in fig. 1 and 2, a filter element 54 is provided at an outlet 521 of the intake passage 52.

In an alternative embodiment not shown, the powder inlet block 30 may also be provided on the hopper 20, and the metering base 50 may also be provided on the hopper 20 or on the powder inlet block 30. In an alternative embodiment, not shown, the powder inlet block 30 is fixedly arranged on the mounting block 10. In an alternative embodiment, not shown, the metering base 50 is fixedly arranged on the mounting 10. These are relatively simple and readily understandable to those skilled in the art, so that no further corresponding figures have to be provided.

In operation, referring to fig. 1 to 10, the metering block 40 moves backward to the feeding position, in which the inlet 431 of the powder storing hole 43 is engaged with the outlet 342 of the powder passing hole 34, and the outlet 432 of the powder storing hole 43 is engaged with the outlet 521 of the air intake passage 52; the powder in the powder passing hole 34 enters the powder storage hole 43 to fill the powder storage hole 43; due to the filter element 54, the powder in the powder storage hole 43 can not enter the air inlet channel 52. The metering block 40 moves forward to the discharging position, at this time, the inlet 431 of the powder storage hole 43 is matched with the outlet of the first channel 33, the outlet 432 of the powder storage hole 43 is matched with the filling hole 53, the outlet 442 of the second channel 44 is matched with the inlet 331 of the first channel 33, and the inlet 441 of the second channel 44 is matched with the outlet 521 of the air inlet channel 52; the gas in the gas inlet passage 52 blows off the powder in the powder storage hole 43 through the second passage 44 and the first passage 33, and then the subsequent filling operation is performed after passing through the filling hole 53. The powder material output each time is determined, the aim of accurate metering is achieved, and no external dust is generated in the metering process. In addition, when in the feeding position, the air inlet passage 52 can be pumped or not pumped, and the functions can be realized; in the discharging position, the air inlet passage 52 is inflated to the second passage 44 to push and accelerate the powder in the powder storage hole 43 to fall down to complete the discharging.

Further, as shown in fig. 1 to 4, a row of powder passing holes 34 are arranged on the powder feeding block 30, and correspondingly, referring to fig. 1 to 10, the powder storing holes 43, the second passage 44, the first passage 33, the filling holes 53 and the air inlet passages 52 are also provided in a corresponding number. The number of the powder passing holes 34 may be 6 as shown in fig. 1 to 3, or 5, 4, 3, 7, 8, 9, 10 or more. In addition, in some alternative embodiments not shown, the powder passing holes 34 may be distributed on a circular arc line, or may be distributed on two straight lines at intervals, or in short, the function of the powder passing holes is not interfered.

In a preferred embodiment, as shown in fig. 1 and 2, the upper portion of the filter element 54 is flush with the outlet 521 of the inlet passage 52; at this time, the amount of the powder metered each time is the amount stored in the powder storage hole 43. In an alternative embodiment, not shown, the upper part of the filter element 54 is located below the outlet 521 of the inlet channel 52, in which case the distance between the outlet 521 and the filter element 54 is filled with powder when the metering block 40 is moved backwards into the feed position; when the metering block 40 moves forward to the discharge position, the powder between the outlet 521 and the filter element 54 passes through the second passage 44, the first passage 33, the powder storage hole 43 and then the filling hole 53, in this case, the amount of powder metered each time is the amount stored in the powder storage hole 43 plus the amount storable between the outlet 521 and the filter element 54, which may be less efficient than a flush solution, and after all, the required time is longer, but it is also possible to achieve the same.

In a preferred embodiment, as shown in fig. 2-4, the powder passing hole 34 is a cylindrical hole. Furthermore, in some alternative embodiments not shown, the powder feed hole 34 may be a conical hole with the smaller opening above and the larger opening below; or the powder passing hole 34 is a combination of two cylindrical holes with a smaller upper part and a larger lower part, or the powder passing hole 34 is a combination of two cylindrical holes with a smaller upper part and a larger lower part and a transitional conical hole, or the powder passing hole 34 is a combination of a downward conical hole and a cylindrical hole, and the major diameter of the conical hole is the same as the diameter of the cylindrical hole; wherein, the conical holes can be replaced by horn holes.

In a preferred embodiment, as shown in fig. 1 and 2, and fig. 5 to 7, the powder storage hole 43 is a cylindrical hole. Furthermore, in some alternative embodiments not shown, the powder storage hole 43 may be a conical hole with the smaller opening above and the larger opening below; or the powder storage hole 43 is a combination of two cylindrical holes with a smaller upper part and a larger lower part, or the powder storage hole 43 is a combination of two cylindrical holes with a smaller upper part and a larger lower part and a transitional conical hole, or the powder storage hole 43 is a combination of a downward conical hole and a cylindrical hole, and the major diameter of the conical hole is the same as the diameter of the cylindrical hole; wherein, the conical holes can be replaced by horn holes.

In a preferred embodiment, as shown in fig. 1 and 2, and 8-10, the fill aperture 53 is a cylindrical aperture. Furthermore, in some alternative embodiments not shown, the filling aperture 53 may be a conical aperture with the smaller mouth above and the larger mouth below; or the filling hole 53 is a combination of two cylindrical holes with a smaller upper part and a larger lower part; or the filling hole 53 is a combination of two cylindrical holes with a smaller upper part and a larger lower part and a transitional conical hole; or the filling hole 53 is a combination of a downward conical hole and a downward cylindrical hole, and the major diameter of the conical hole is the same as that of the cylindrical hole; wherein, the conical holes can be replaced by horn holes.

In a preferred embodiment, as shown in fig. 2 to 4, the first channel 33 includes a first vertical cylindrical hole 331, a second vertical cylindrical hole 332, and a first horizontal cylindrical hole 333, the first horizontal cylindrical hole 333 is communicated with the first vertical cylindrical hole 331 and the second vertical cylindrical hole 332, and the first horizontal cylindrical hole 333 is formed by drilling from outside to inside and then blocking the hole, which is relatively simple in process. In an alternative embodiment not shown, it is also possible to dig a groove and then plug the middle part so that the two ends form the inlet and outlet; alternatively, it is also possible to directly employ a groove having both ends serving as an inlet and an outlet of the first passage 33, respectively. In yet another alternative embodiment, not shown, the first channel 33 is formed by two intersecting cylindrical bores and has an inverted V-shape, or the first channel 33 has an inverted U-shape. As shown in fig. 1 to 4, the first vertical cylindrical hole 331 is an inlet 331 of the first passage 33, and the second vertical cylindrical hole 332 is an outlet 332 of the first passage 33.

In a preferred embodiment, as shown in fig. 1 and 2, and fig. 5 to 7, the second passage 44 includes a third vertical cylindrical hole 443, a U-shaped second groove 444 communicating with the bottom of the third vertical cylindrical hole 443, and the second groove 444 does not communicate with the powder storage hole 43. In an alternative embodiment not shown, the second passage 44 may be two intersecting cylindrical holes arranged obliquely, and the two intersecting cylindrical holes do not intersect with the powder storage hole 43. In yet another alternative embodiment, not shown, the second channel 44 is a spiral channel formed by: milling an arc-shaped groove, wherein the depth of the groove is continuously increased and the groove is communicated with the position matched with the air inlet channel 52; of course, blocking the non-mating positions may facilitate sealing or may not adversely affect the same. Generally, when the outlet 432 of the powder storage hole 43 is matched with the filling hole 53, the outlet 432 is generally larger than or equal to the filling hole 53, so that the powder can smoothly fall down.

In a preferred embodiment, referring to fig. 1 and 2, the mounting base 10 includes a pair of support arms 11 arranged in parallel, the powder feeding block 30 is mounted above the pair of support arms 11, the metering base 50 is mounted below the pair of support arms 11, and the metering block 40 is located between the pair of support arms 11. In addition, various other suitable prior art techniques and combinations thereof may be used for the mount 10.

In a preferred embodiment, as shown in fig. 1 and 2, the hopper 20 comprises a hopper body 21 and a connecting seat 22, and an outlet 23 of the hopper 20 is located on the connecting seat 22.

In a preferred embodiment, as shown in fig. 1 and 3, the lower surface 32 of the powder feeding block 30 is provided with a blind threaded hole 35, and the upper surface 31 of the powder feeding block 30 is provided with a bolt counterbore 36. As shown in fig. 1 and 8, the metering base 50 is provided with a bolt counterbore 57. Correspondingly, referring to fig. 1, the support arm 11 is provided with a threaded hole matching with the bolt counterbore 36 and a bolt hole matching with the bolt counterbore 57, a bolt fastened to the powder feeding block 30 passes through the threaded counterbore 36 and then matches and is screwed with the threaded hole, and a bolt fastened to the metering base 50 passes through the bolt counterbore 57 and then matches and is screwed with the threaded blind hole 35. The manner in which the metering base 50 is engaged with the powder inlet block 30 facilitates the engagement of the various apertures. Of course, the above is only a preferred solution, and other various existing technologies can be adopted to realize the respective installation, so as to ensure the relative position.

In a preferred embodiment, as shown in fig. 1 and 2, the provided metering device further comprises a driving mechanism 60 for driving the metering block 40 to move back and forth, wherein the driving mechanism 60 comprises a linear bearing 61 arranged on the mounting base 10, and a traction shaft 62 matched with the linear bearing 61 and connected with the metering block 40. As shown in fig. 5 and 6, the gauge block 40 is provided with two draft shaft mounting holes 45. One end of the pulling shaft 62 is disposed in the pulling shaft mounting hole 45, for example, an interference fit manner, a transition fit manner or a clearance fit manner may be adopted, at this time, a set screw generally needs to be disposed, and of course, other manners of determining the relative position according to the prior art may also be adopted, such as using glue. As shown in fig. 1 and 2, the device further includes a guide post 63, a latch 64, and a power source 65, the latch 64 is slidably disposed on the guide post 63 and connected to the traction shaft 62, the latch 64 is controlled by the power source 65 to reciprocate, and of course, the specific structure of the power source 65 and other components connected to the power source 65 are not explicitly shown in the drawings. The power source 65 for driving the block 64 is not the invention of the present invention, and the specific structure of the present invention is not limited, as long as it can complete the function of driving the block 64, and any prior art can be used.

In a preferred embodiment, as shown in fig. 9 and 10, the main air duct 56 is provided on the metering base 50, and the main air duct 56 connects all the air inlet channels 52 in one row, and when this scheme is adopted, the bottoms 522 of the air inlet channels 52 are all blocked, so that the air inlet and/or air outlet of all the connected air inlet channels 52 can be controlled uniformly by controlling the main air duct 56. As shown in fig. 9 and 10, the main air duct 56 is a horizontal cylindrical hole, both ends of which are open, and a connection threaded hole is provided at the outlet of one end or both ends for facilitating the installation of components such as a seal or a joint.

On the basis of any one of the above embodiments, further improvements can be made.

As shown in fig. 1, 2, and 11 to 13, a cartridge seat 55 is provided in the intake passage 52, and a cartridge 54 is provided on an upper portion of the cartridge seat 55. As shown in fig. 11 to 13, the filter element 54 is formed in a micro slit structure. As shown in fig. 14 and 15, the filter cartridge 54 employs tiny channels bound together by a plurality of fine cylindrical steel wires, also formed therebetween, that are permeable to air but resistant to powder. In addition, various other suitable techniques may be used, as long as the powder is filtered and aerated.

Furthermore, the utility model also provides a powder filling machine, this powder filling machine includes the metering device that any embodiment of the aforesaid provided. For the specific embodiment, please refer to the above contents, and combine with the related prior art to obtain the technical solution of the filling machine, which is not described in detail in this application.

The metering device provided by the utility model and the powder filling machine comprising the metering device are described in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that those skilled in the art will be able to devise numerous alternative designs and embodiments for practicing the invention within the scope of the appended claims without departing from the principles of the invention.

Claims

1. A metering device comprises a mounting seat, a hopper, a powder feeding block, a metering base and a driving mechanism, wherein the hopper is arranged on the mounting seat, the powder feeding block is arranged on the mounting seat or the hopper, the metering base is arranged on the mounting seat or the powder feeding block or the hopper,

2. The metering device of claim 1, wherein a filter cartridge seat is arranged in the air inlet passage, and the filter cartridge is arranged at the upper part of the filter cartridge seat.

3. The metering device of claim 1, wherein the powder inlet block is provided with a plurality of regularly arranged powder passing holes, and the powder storage holes, the second passage, the first passage, the filling holes and the gas inlet passage are also provided with corresponding numbers.

4. The metering device of claim 1, wherein an upper portion of the filter element is flush with an outlet of the inlet passage.

5. The metering device of any one of claims 1 to 4, wherein the powder passing hole is a cylindrical hole; or the powder passing hole is a conical hole with a larger lower part; or the powder passing hole is a combination of two cylindrical holes with a smaller upper part and a larger lower part; or the powder passing hole is a combination of two cylindrical holes with smaller upper parts and larger lower parts and a transitional conical hole; or the powder passing hole is a combination of a downward conical hole and a downward cylindrical hole, and the major diameter of the conical hole is the same as that of the cylindrical hole;

the powder storage hole is a cylindrical hole; or the powder storage hole is a conical hole with a larger lower part; or the powder storage hole is a combination of two cylindrical holes with a smaller upper part and a larger lower part; or the powder storage hole is a combination of two cylindrical holes with a smaller upper part and a larger lower part and a transitional conical hole; or the powder storage hole is a combination of a downward conical hole and a downward cylindrical hole, and the major diameter of the conical hole is the same as that of the cylindrical hole;

the filling hole is a cylindrical hole; or the filling hole is a conical hole with a larger lower part; or the filling hole is a combination of two cylindrical holes with a smaller upper part and a larger lower part; or the filling hole is a combination of two cylindrical holes with smaller upper parts and larger lower parts and a transitional conical hole; or the filling hole is a combination of a downward conical hole and a downward cylindrical hole, and the major diameter of the conical hole is the same as that of the cylindrical hole.

6. A metering device according to claim 5 wherein the conical bores are replaced by flared bores.

7. The metering device of any one of claims 1 to 4, wherein the first passage comprises a first vertical cylindrical bore, a second vertical cylindrical bore, and a first horizontal cylindrical bore communicating the first vertical cylindrical bore and the second vertical cylindrical bore, the first vertical cylindrical bore being an inlet of the first passage; or the first channel is formed by two crossed cylindrical holes and is in an inverted V shape; or the first channel is in an inverted U shape; or the first channel is a first groove, and two ends of the first groove are respectively used as an inlet and an outlet of the first channel.

8. The metering device of claim 1, wherein the hopper comprises a hopper body and a connecting seat, the outlet of the hopper being located on the connecting seat; the mounting seat comprises a pair of supporting arms which are arranged in parallel, the powder feeding block is arranged above the pair of supporting arms, the metering base is arranged below the pair of supporting arms, and the metering block is positioned between the pair of supporting arms.

9. The metering device of any one of claims 1 to 4, wherein the second passage comprises a third vertical cylindrical hole, a U-shaped second groove communicating with the bottom of the third vertical cylindrical hole, the second groove not communicating with the powder storage hole; or the second channel is two intersected and obliquely arranged cylindrical holes; or the second channel is a spiral pore canal.

10. Powder filling machine, characterized in that it comprises a metering device as claimed in any one of claims 1 to 9.