CN111804909B - Powder filling method of beryllium material forming blank for CETR reactor - Google Patents

Powder filling method of beryllium material forming blank for CETR reactor Download PDF

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Publication number
CN111804909B
CN111804909B CN202010556826.1A CN202010556826A CN111804909B CN 111804909 B CN111804909 B CN 111804909B CN 202010556826 A CN202010556826 A CN 202010556826A CN 111804909 B CN111804909 B CN 111804909B
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feeder
vibration
powder
beryllium
sheath
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CN111804909A (en
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张鹏翔
王东新
李志年
钟景明
王战宏
乔鹏
邵伟
周凯
张子富
刘宁
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Northwest Rare Metal Materials Research Institute Ningxia Co ltd
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Northwest Rare Metal Materials Research Institute Ningxia Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F3/093—Compacting only using vibrations or friction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/004—Filling molds with powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Abstract

The invention discloses a powder filling method of a beryllium material forming blank for a CETR reactor, which comprises the following steps: step one, calculating the required beryllium powder filling amount; step two, preparing materials, placing the materials into a feeder of a closed blanking device, and sealing the feeder; step three, starting a first vibrating motor, driving a feeder to vibrate, and discharging beryllium powder into a sheath hermetically connected with the feeder; fourthly, starting a second vibration motor, adjusting the vibration frequency of the vibration platform, and compacting the beryllium powder in the sheath; when the filling amount of the beryllium powder is 90-100%, adjusting the vibration frequency to be 0-80 Hz; when the filling amount of the beryllium powder is 70-90%, adjusting the vibration frequency to be 80-120 Hz; when the filling weight of the beryllium powder is 0-70%, the vibration frequency is adjusted to be 120-180 Hz. The invention ensures the tap density and uniformity of the beryllium powder filled in the sheath, can meet the requirement of green compact performance, and has high powder filling efficiency.

Description

Powder filling method of beryllium material forming blank for CETR reactor
Technical Field
The invention belongs to the technical field of nonferrous metallurgy, and particularly relates to a powder filling method of a beryllium material forming blank for a CETR reactor.
Background
Beryllium is a rare metal, has remarkable comprehensive physical, thermal and mechanical properties, and is widely applied to various fields such as aerospace and the like. Beryllium and beryllium compounds have toxicity, the toxicity of beryllium is mainly infection of respiratory organs and dermatitis caused by direct contact of the skin, and the beryllium product needs to be protected during the manufacturing process. Among manufacturing techniques of metal materials, powder metallurgy is one of important manufacturing methods. Powder metallurgy is a technique of converting a powder material having a certain specific particle size, shape and apparent density into a material having high strength, high precision and high performance. Beryllium is one of a few metals that can only be manufactured using powder metallurgy techniques.
Beryllium powder can be consolidated and formed by adopting various different processes to approach the theoretical density. The beryllium powder has poor flowability and small loose packing density, the tap density of the powder directly influences the quality of a pressed blank, particularly the expensive and toxic powder such as the beryllium powder, and the conventional powder packing method of the beryllium material forming blank is to manually tamp the beryllium powder after filling the beryllium powder into a sheath, so that the defects that: 1. beryllium powder is filled into a wrapping sleeve and tamped to reach a certain filling density, then an isostatic pressing forming technology is adopted to manufacture a beryllium material forming blank, and the filling density of the tamped powder can not meet the requirement of the performance of a pressed compact; 2. the beryllium powder has poor flowability, so that the uniformity of the powder after tamping is poor, and the size uniformity and the flatness of a pressed blank are influenced because the size uniformity and the flatness of the pressed blank depend on the uniformity of powder filling; 3. the tamping process is non-closed operation, and impurities are easily generated in the powder and can influence the performance and the material stability of the formed blank. Particularly, the size of a beryllium product for a phi 300-700 mm CETR reactor reaches 700mm to the maximum, a large amount of raw material powder is needed, the powder filling time is too long, and the production efficiency is low.
Disclosure of Invention
The invention aims to provide a powder filling method of a beryllium material forming blank for a CETR reactor, which ensures the tap density and uniformity of beryllium powder filled in a sheath, can meet the requirements of compaction performance and material stability, has high powder filling efficiency, and is particularly suitable for filling powder of beryllium material products for the CETR reactor with the diameter of 300-700 mm.
In order to achieve the purpose, the invention adopts the following technical scheme:
a powder filling method of beryllium material molding blank for a CETR reactor comprises the following steps:
step one, calculating the required beryllium powder filling amount according to the size of the sheath 5 and the beryllium powder density;
step two, preparing materials according to the required beryllium powder filling amount, filling the materials into a feeder 1 of a closed discharging device, and sealing the device;
step three, starting a first vibrating motor, driving a feeder 1 to vibrate, and discharging beryllium powder into a sheath 5 hermetically connected with the feeder 1;
fourthly, according to the amount of the beryllium powder in the feeder 1, starting a second vibrating motor, adjusting the vibration frequency of the vibrating platform 4, and compacting the beryllium powder in the sheath 5;
the vibration frequency of the vibration table 3 is adjusted as follows:
observing through an observation port on the feeder 1, and adjusting the vibration frequency of the vibration platform 4 to be 0-80 Hz when the filling amount of the beryllium powder in the feeder 1 is 90-100%; when the filling amount of beryllium powder in the feeder 1 is 70-90%, adjusting the vibration frequency of the vibration platform 4 to be 80-120 Hz; when the filling weight of the beryllium powder in the feeder 1 is 0-70%, the vibration frequency of the vibration platform 4 is adjusted to be 120-180 Hz.
Further, when the vibration frequency of the vibration platform 4 is between 0Hz and 80Hz, the vibration time is between 0.5h and 3 h;
when the vibration frequency of the vibration platform 4 is between 80Hz and 120Hz, the vibration time is 0.5 to 4 hours;
when the vibration frequency of the vibration platform 4 is between 120Hz and 180Hz, the vibration time is 0.2 to 6 hours.
Further, the closed blanking device comprises a feeder 1, a sheath retainer 2, a vibration platform 4, a first vibration motor and a second vibration motor;
the side wall of the feeder 1 is provided with an observation window for observing the interior of the feeder 1;
the sheath 5 is placed in the sheath holder 2; the sheath retainer 2 is fixed on the vibration platform 4;
the feeder 1 is in sealed flexible connection with the feed opening 3 on the sheath 5 through a plurality of channels 6;
the first vibration motor drives the feeder 1 to feed materials into the sheath 5; and the second vibration motor drives the vibration platform 4 to tap beryllium powder in the sheath 5.
Further, the channel 6 includes a first channel 6-1 and a second channel 6-2;
the feeding end of the first channel 6-1 is connected with the discharging port 1-1 at the bottom of the feeder 1; the discharge end of the first channel 6-1 is connected with the feed end of the second channel 6-2; the discharge end of the second channel 6-2 is inserted into the feed opening 3 and is in sealed flexible connection with the interior of the sheath 5.
Furthermore, a plurality of feed openings 3 are uniformly distributed on the cross section of the sheath 5.
Further, the closed blanking device also comprises a detachable filter screen 7;
the detachable filter screen 7 is positioned between the discharge end of the first channel 6-1 and the feed end of the second channel 6-2.
Further, the feeder 1 is a table-shaped structure with a wide upper part and a narrow lower part.
Further, the upper end of the feeder 1 is also provided with a hanger 8 for hanging the feeder 1.
The invention has the beneficial effects that:
the invention adopts variable frequency vibration to charge powder, the powder is filled into a sheath, a vibration platform is adopted to carry out continuous compaction on the powder, the vibration frequency of the vibration platform is adjusted along with the increase of the filling weight of the powder in the sheath, and the tap density of the powder filled in the sheath is improved (the tap density can reach 0.56-1.2 g/cm)3) And uniformity, and the method is closed powder filling, can solve the problem that powder is easy to mix, and ensures the uniformity and flatness of the performance and size of the pressed compact after the beryllium material is moldedThe powder filling efficiency is high, and the powder filling device is particularly suitable for filling powder into beryllium products for 300-700 mm phi CETR reactors; the closed blanking device is adopted, so that closed powder filling is realized, the product is prevented from being mixed due to the external environment, and meanwhile, the pollution of beryllium powder to the environment is reduced.
Drawings
FIG. 1 is a schematic structural view of a closed blanking device for beryllium material formed blanks for a CETR reactor of the present invention;
in the figure, 1-a feeder, 1-1-a discharge port, 2-a jacket retainer, 3-a feed port, 4-a vibration platform, 5-a jacket, 6-a channel, 6-1-a first channel, 6-2-a second channel, 7-a detachable filter screen and 8-a hanger.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The embodiment provides a powder filling method of a beryllium material forming blank for a CETR reactor, which comprises the following steps:
step one, calculating the required beryllium powder filling amount according to the size of the sheath 5 and the beryllium powder density;
step two, preparing materials according to the required beryllium powder filling amount, filling the materials into a feeder 1 of a closed discharging device, and sealing the device;
step three, starting a first vibrating motor, driving a feeder 1 to vibrate, and discharging beryllium powder into a sheath 5 hermetically connected with the feeder 1;
fourthly, according to the amount of the beryllium powder in the feeder 1, starting a second vibrating motor, adjusting the vibration frequency of the vibrating platform 4, and compacting the beryllium powder in the sheath 5;
the vibration frequency of the vibration table 3 is adjusted as follows:
observing through an observation port on the feeder 1, and adjusting the vibration frequency of the vibration platform 4 to be 0-80 Hz when the filling amount of the beryllium powder in the feeder 1 is 90-100%; when the filling amount of beryllium powder in the feeder 1 is 70-90%, adjusting the vibration frequency of the vibration platform 4 to be 80-120 Hz; when the filling weight of the beryllium powder in the feeder 1 is 0-70%, the vibration frequency of the vibration platform 4 is adjusted to be 120-180 Hz.
In order to ensure the uniformity of the powder in the sheath and the uniformity of the product size, the vibration time is controlled in stages to achieve the required tap density of the powder, and when the vibration frequency of the vibration platform 4 is between 0Hz and 80Hz, the vibration time is 0.5h to 3 h; when the vibration frequency of the vibration platform 4 is between 80Hz and 120Hz, the vibration time is 0.5 to 4 hours; when the vibration frequency of the vibration platform 4 is between 120Hz and 180Hz, the vibration time is 0.2 to 6 hours.
The structure of the closed blanking device in this embodiment is shown in fig. 1, and includes a feeder 1, a jacket holder 2, a vibration platform 4, a first vibration motor (not shown), and a second vibration motor (not shown). The side walls of the dispenser 1 are provided with viewing windows (not shown) for viewing into the dispenser 1. The sheath 5 is arranged in the sheath holder 2; the sheath holder 2 is fixed on the vibration platform 4. The feeder 1 is hermetically and flexibly connected with the feed opening 3 on the sheath 5 through a plurality of channels 6. The first vibration motor drives the feeder 1 to feed materials into the sheath 5; the second vibration motor drives the vibration platform 4 to tamp beryllium powder in the sheath 5, and the beryllium powder in the feeder 1 is uniformly filled into the sheath through a plurality of channels through the first vibration motor, so that closed blanking is realized, external environment inclusion is avoided, pollution of the beryllium powder to the environment is reduced, and powder blanking uniformity and filling efficiency are improved.
The passage 6 in this embodiment includes a first passage 6-1 and a second passage 6-2; the feeding end of the first channel 6-1 is connected with the discharging port 1-1 at the bottom of the feeder 1; the discharge end of the first channel 6-1 is connected with the feed end of the second channel 6-2; the discharge end of the second channel 6-2 is inserted into the feed opening 3 and is in sealed flexible connection with the interior of the sheath 5.
The diameter of the plurality of channels 6 is the same and is evenly distributed, powder can be evenly filled into the sheath through the plurality of channels due to gravity, the powder discharging uniformity is further guaranteed, and the powder filling efficiency can be improved through the discharging of the plurality of channels.
In order to effectively block large particles in the powder with different specifications, the closed blanking device of the embodiment further comprises a detachable filter screen 7; the detachable filter screen 7 is positioned between the discharge end of the first channel 6-1 and the feed end of the second channel 6-2, and the diameter of the filter screen is selected according to the particle size of the beryllium powder.
The feeder 1 of this embodiment is a table-shaped structure with a wide top and a narrow bottom, so as to facilitate the powder filling into the feeder, and the powder flows downward freely due to the gravity, thereby improving the flowability of the powder and providing a more uniform feeding. The upper end of the feeder 1 is also provided with a hanger 8 for hanging the feeder 1 so as to hang and fix the whole closed blanking device.
In the embodiment, variable-frequency vibration is adopted for filling powder, the powder is filled into a sheath, a vibration platform is adopted for continuously compacting the powder, the vibration frequency of the vibration platform is adjusted along with the increase of the filling weight of the powder in the sheath, and the compaction density of the powder filled in the sheath is improved (the compaction density can reach 0.56-1.2 g/cm)3) The uniformity is achieved, meanwhile, the method is closed powder filling, the problem that powder is easy to mix is solved, the uniformity and flatness of the performance and size of a pressed blank after the beryllium material is formed are guaranteed, the requirements of the performance and the material stability of the pressed blank can be met, the powder filling efficiency is high, and the method is particularly suitable for filling powder of beryllium material products for 300-700 mm diameter CETR reactors; the closed blanking device is adopted, so that closed powder filling is realized, the product is prevented from being mixed due to the external environment, and meanwhile, the pollution of beryllium powder to the environment is reduced.
Example 1:
step one, calculating the required beryllium powder filling amount to be 50kg according to the size of the sheath 5 and the density of the beryllium powder;
step two, preparing materials according to the required beryllium powder filling amount of 50kg, loading the materials into a feeder 1 of a closed discharging device, and sealing;
step three, starting a first vibrating motor, driving a feeder 1 to vibrate, and discharging beryllium powder into a sheath 5 hermetically connected with the feeder 1;
fourthly, according to the amount of the beryllium powder in the feeder 1, starting a second vibrating motor, adjusting the vibration frequency of the vibrating platform 4, and compacting the beryllium powder in the sheath 5;
the adjustment of the vibration frequency of the vibration table 3 is as follows:
observing through an observation port on the feeder 1, and adjusting the vibration frequency of the vibration platform 4 to be 0Hz when the beryllium powder loading in the feeder 1 is 90%; when the filling amount of beryllium powder in the feeder 1 is 70%, adjusting the vibration frequency of the vibration platform 4 to be 80Hz and the vibration time to be 0.5 h; when the filling weight of the beryllium powder in the feeder 1 is 0 percent, the vibration frequency of the vibration platform 4 is adjusted to be 120Hz, the vibration time is 0.2h, and the actually measured tap density of the powder reaches 0.56g/cm3。
Example 2:
step one, calculating the required beryllium powder filling amount to be 70kg according to the size of the sheath 5 and the beryllium powder density;
step two, preparing materials according to the required beryllium powder filling amount of 70kg, loading the materials into a feeder 1 of a closed discharging device, and sealing;
step three, starting a first vibrating motor, driving a feeder 1 to vibrate, and discharging beryllium powder into a sheath 5 hermetically connected with the feeder 1;
fourthly, according to the amount of the beryllium powder in the feeder 1, starting a second vibrating motor, adjusting the vibration frequency of the vibrating platform 4, and compacting the beryllium powder in the sheath 5;
the adjustment of the vibration frequency of the vibration table 3 is as follows:
observing through an observation port on the feeder 1, and when the filling amount of the beryllium powder in the feeder 1 is 95%, adjusting the vibration frequency of the vibration platform 4 to be 40Hz and the vibration time to be 1.2 h; when the filling amount of beryllium powder in the feeder 1 is 80%, adjusting the vibration frequency of the vibration platform 4 to be 100Hz and the vibration time to be 0.9 h; when the filling weight of the beryllium powder in the feeder 1 is 35 percent, the vibration frequency of the vibration platform 4 is adjusted to be 150Hz, the vibration time is 0.2h, and the actually measured tap density of the powder reaches 0.78g/cm3。
Example 3:
step one, calculating the required beryllium powder filling amount to be 300kg according to the size of the sheath 5 and the beryllium powder density;
step two, preparing materials according to the required beryllium powder filling amount of 300kg, loading the materials into a feeder 1 of a closed discharging device, and sealing;
step three, starting a first vibrating motor, driving a feeder 1 to vibrate, and discharging beryllium powder into a sheath 5 hermetically connected with the feeder 1;
fourthly, according to the amount of the beryllium powder in the feeder 1, starting a second vibrating motor, adjusting the vibration frequency of the vibrating platform 4, and compacting the beryllium powder in the sheath 5;
the adjustment of the vibration frequency of the vibration table 3 is as follows:
observing through an observation port on the feeder 1, and when the filling amount of the beryllium powder in the feeder 1 is 90%, adjusting the vibration frequency of the vibration platform 4 to be 80Hz and the vibration time to be 3 h; when the filling amount of beryllium powder in the feeder 1 is 85%, adjusting the vibration frequency of the vibration platform 4 to be 120Hz and the vibration time to be 4 h; when the filling weight of the beryllium powder in the feeder 1 is 70 percent, the vibration frequency of the vibration platform 4 is adjusted to be 180Hz, the vibration time is 6 hours, and the actually measured tap density of the powder reaches 1.2g/cm3。
Example 4:
step one, calculating the required beryllium powder filling amount to be 300kg according to the size of the sheath 5 and the density of the beryllium powder;
step two, preparing materials according to the required beryllium powder filling amount of 300kg, loading the materials into a feeder 1 of a closed discharging device, and sealing;
step three, starting a first vibrating motor, driving a feeder 1 to vibrate, and discharging beryllium powder into a sheath 5 hermetically connected with the feeder 1;
fourthly, according to the amount of the beryllium powder in the feeder 1, starting a second vibrating motor, adjusting the vibration frequency of the vibrating platform 4, and compacting the beryllium powder in the sheath 5;
the adjustment of the vibration frequency of the vibration table 3 is as follows:
observing through an observation port on the feeder 1, and adjusting the vibration frequency of the vibration platform 4 to be 70Hz and the vibration time to be 2h when the filling amount of the beryllium powder in the feeder 1 is 95%; when the filling amount of beryllium powder in the feeder 1 is 90%, adjusting the vibration frequency of the vibration platform 4 to be 100Hz and the vibration time to be 2 h; when the filling weight of the beryllium powder in the feeder 1 is 70 percent, the vibration frequency of the vibration platform 4 is adjusted to be 170Hz, the vibration time is 4h, and the actual measurement of the tap density of the powder is carried outReaches 1.0g/cm3。
Example 5:
step one, calculating the required beryllium powder filling amount to be 50kg according to the size of the sheath 5 and the density of the beryllium powder;
step two, preparing materials according to the required beryllium powder filling amount of 50kg, loading the materials into a feeder 1 of a closed discharging device, and sealing;
thirdly, starting a first vibrating motor, driving a feeder 1 to vibrate, and discharging beryllium powder into a sheath 5 hermetically connected with the feeder 1;
fourthly, according to the amount of the beryllium powder in the feeder 1, starting a second vibrating motor, adjusting the vibration frequency of the vibrating platform 4, and compacting the beryllium powder in the sheath 5;
the adjustment of the vibration frequency of the vibration table 3 is as follows:
observing through an observation port on the feeder 1, and adjusting the vibration frequency of the vibration platform 4 to be 10Hz and the vibration time to be 1h when the beryllium powder loading in the feeder 1 is 90%; when the filling amount of beryllium powder in the feeder 1 is 70%, adjusting the vibration frequency of the vibration platform 4 to be 90Hz and the vibration time to be 1 h; when the filling weight of the beryllium powder in the feeder 1 is 0 percent, the vibration frequency of the vibration platform 4 is adjusted to be 160Hz, the vibration time is 2 hours, and the actually measured tap density of the powder reaches 0.70g/cm3。
Although the embodiments of the present invention have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the embodiments of the present invention.

Claims (4)

1. A powder filling method of a beryllium material molding blank for a reactor is characterized by comprising the following steps:
step one, calculating the required beryllium powder filling amount according to the size of the sheath (5) and the beryllium powder density;
step two, preparing materials according to the required beryllium powder filling amount, filling the materials into a feeder (1) of a closed discharging device, and sealing the feeder;
step three, starting a first vibrating motor, driving the feeder (1) to vibrate, and discharging beryllium powder into a sheath (5) hermetically connected with the feeder (1);
fourthly, starting a second vibrating motor according to the amount of beryllium powder in the feeder (1), adjusting the vibration frequency of the vibrating platform (4), and compacting the beryllium powder in the sheath (5);
the vibration frequency of the vibration platform (4) is adjusted as follows:
observing through an observation port on the feeder (1), and adjusting the vibration frequency of the vibration platform (4) to be 0-80 Hz when the filling amount of beryllium powder in the feeder (1) is 90-100%; when the filling amount of beryllium powder in the feeder (1) is 70-90%, adjusting the vibration frequency of the vibration platform (4) to be 80-120 Hz; when the filling amount of beryllium powder in the feeder (1) is 0-70%, adjusting the vibration frequency of the vibration platform (4) to be 120-180 Hz;
the closed blanking device comprises a feeder (1), a sheath retainer (2), a vibration platform (4), a first vibration motor and a second vibration motor;
the side wall of the feeder (1) is provided with an observation window for observing the filling amount of beryllium powder in the feeder (1);
the sheath (5) is placed in the sheath holder (2); the sheath retainer (2) is fixed on the vibration platform (4);
the feeder (1) is in sealed flexible connection with the feed opening (3) on the sheath (5) through a plurality of channels (6); the channel (6) comprises a first channel (6-1) and a second channel (6-2);
the feeding end of the first channel (6-1) is connected with the discharging port (1-1) at the bottom of the feeder (1); the discharge end of the first channel (6-1) is connected with the feed end of the second channel (6-2); the discharge end of the second channel (6-2) is inserted into the feed opening (3) and is in sealed flexible connection with the sheath (5); the first vibration motor drives the feeder (1) to feed materials into the sheath (5); the second vibration motor drives the vibration platform (4) to tap beryllium powder in the sheath (5);
the closed blanking device also comprises a detachable filter screen (7);
the detachable filter screen (7) is positioned between the discharge end of the first channel (6-1) and the feed end of the second channel (6-2);
the feeder (1) is in a table-shaped structure with a wide upper part and a narrow lower part.
2. The powder filling method according to claim 1, wherein when the vibration frequency of the vibration platform (4) is between 0Hz and 80Hz, the vibration time is between 0.5h and 3 h;
when the vibration frequency of the vibration platform (4) is between 80Hz and 120Hz, the vibration time is 0.5 to 4 hours;
when the vibration frequency of the vibration platform (4) is between 120Hz and 180Hz, the vibration time is 0.2 to 6 hours.
3. The powder charging method according to claim 1, wherein the plurality of channels (6) have the same diameter and are uniformly distributed.
4. Method for filling powder according to claim 1, characterised in that the upper end of the feeder (1) is also provided with a hanger (8) for hanging the feeder (1).
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