Powder micro-feeder and feeding method

Abstract

The application discloses a powder micro-feeding device and a powder micro-feeding method. The powder micro-feeding device comprises a powder storage cylinder for storing powder, a powder guide device movably arranged in the powder storage cylinder, and a powder guide cylinder of the powder guide device, one end of the powder guide cylinder being in contact with a powder surface. The powder guide cylinder is further connected with a powder discharging pipe and a blowing mechanism, the powder discharging pipe extending to the outside of the powder storage cylinder, and the blowing mechanism facing the powder surface. The powder micro-feeding method is based on the powder micro-feeding device, and comprises the following steps: S1, adding powder into the powder storage cylinder, and making one end of the powder guide cylinder in contact with the powder surface; and S2, blowing air to the powder by the blowing mechanism to make the powder fly up and be transported to the outside of the powder storage cylinder through the powder discharging pipe. The powder micro-feeding device and the powder micro-feeding method can realize micro-feeding of powder, and the added powder has good uniformity in particle size and is not damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of powder conveying equipment, in particular to a powder micro-feeding device and a feeding method. BACKGROUND

[0002] In the fields of petrochemical industry, fine chemical industry, pharmaceutical industry and the like, micro-feeding of powder is often required, and thus a corresponding feeding device is needed to realize the micro-feeding of powder. At present, the powder micro-feeding devices mainly include two types: one is a screw feeder, which carries powder by a helical groove on a screw and conveys the powder by rotation of the screw. When the screw feeder is used for feeding, the powder is easily ground in the conveying process, which leads to a decrease in the particle size of the powder, affecting the subsequent operation, and the screw feeder is easily worn and air leakage, and is not suitable for high-temperature working conditions; the other is a pneumatic conveying type feeder, which directly introduces high-pressure conveying air into the feeder, and relies on the high-pressure conveying air to carry particles and add them into a device. However, due to the limitation of the structure, a large disturbance is generated to the powder in the tank during the feeding process, and the feeding amount is not easy to accurately control, so that the micro-feeding of powder is difficult to realize, and the air volume is relatively large, and the excessive air is easy to affect the subsequent process flow, which is generally only used for intermittent feeding. SUMMARY

[0003] In order to solve the problems of the prior art that the powder feeding device is easy to damage the powder and difficult to realize micro-feeding, the present application provides a powder micro-feeding device and a feeding method, which has good uniformity of particle size of the added powder, does not cause damage to the powder, and can realize micro-feeding.

[0004] In order to achieve the above-mentioned purpose, the specific scheme adopted by the present application is as follows: a powder micro-feeding device, comprising a material storage cylinder for storing powder, a material guide device movably arranged in the material storage cylinder, the material guide device comprising a material guide cylinder, one end of the material guide cylinder being in contact with a material surface of the powder, the material guide cylinder further being communicated with a material discharge pipe and a gas blowing mechanism, the material discharge pipe extending to the outside of the material storage cylinder, the gas blowing mechanism facing the material surface of the powder.

[0005] As a further optimization of the above-mentioned powder micro-feeding device, the feeding device further comprises a weighing sensor, and the material storage cylinder is vertically arranged on the weighing sensor.

[0006] As a further optimization of the above-mentioned powder micro-feeding device, an air release mechanism is detachably arranged at the upper end of the material storage cylinder.

[0007] As a further optimization of the above-mentioned powder micro-feeding device, the air release mechanism comprises a cover plate detachably connected with the upper end of the material storage cylinder, an air release pipe communicated with the material storage cylinder is arranged through the cover plate, and an air release adjusting valve and an air release flowmeter are arranged on the air release pipe.

[0008] As a further optimization of the above-mentioned powder micro-feeding device: the air release mechanism comprises a filter plate detachably arranged in the material storage cylinder.

[0009] As a further optimization of the above-mentioned powder micro-feeding device: the material guiding cylinder comprises an integral conical cylinder section and a cylindrical section, the large end of the conical cylinder section is in communication with one end of the cylindrical section, and the other end of the cylindrical section is in communication with the powder material surface, and the material discharging pipe and the air blowing mechanism are both in communication with the conical cylinder section.

[0010] As a further optimization of the above-mentioned powder micro-feeding device: the small-diameter section of the conical cylinder section is fixedly connected with an end plate, and a plurality of air release holes are formed in the end plate.

[0011] As a further optimization of the above-mentioned powder micro-feeding device: an inner cylinder is coaxially arranged in the cylindrical section, the inner cylinder extends into the conical cylinder section and is fixedly connected with the conical cylinder section, and a sealing plate is fixedly connected between the inner cylinder and the cylindrical section.

[0012] As a further optimization of the above-mentioned powder micro-feeding device: the air blowing mechanism comprises a compressed air inlet pipe penetrating the material guiding cylinder, the compressed air inlet pipe is connected with a gas distributor after extending into the material guiding cylinder, and the gas outlet of the gas distributor faces the powder material surface.

[0013] As a further optimization of the above-mentioned powder micro-feeding device: an air inlet adjusting valve and an air flow meter are arranged on the compressed air inlet pipe.

[0014] The present application also provides a powder micro-feeding method based on the above-mentioned powder micro-feeding device, which comprises the following steps:

[0015] S1, powder is added to the material storage cylinder, and one end of the material guiding cylinder is in contact with the powder material surface;

[0016] S2, the air blowing mechanism is used to blow air to the powder to make the powder fly up and be transported to the outside of the material storage cylinder through the material discharging pipe.

[0017] Advantages:

[0018] 1. In the present application, the feeding gas only contacts the powder material surface, and does not disturb the whole powder, so that the particle size uniformity of the added powder is good, the powder is not damaged, and the amount of the powder flying up can be controlled by controlling the amount and speed of the gas, so that the feeding amount is easy to control, and the powder micro-feeding is realized.

[0019] 2. In the present application, the material guiding device descends synchronously with the powder material surface during the feeding process, and always maintains a close contact state with the powder material surface, the air outlet position of the air blowing mechanism is the same distance from the material surface, and the powder after flying up all enters the same path of the material discharging pipe, so that the feeding amount can be more accurately controlled.

[0020] 3. Compared with existing screw feeders, the present invention does not cause powder wear, and has a simple structure, is easy to process and manufacture, and has low cost; compared with existing pneumatic conveying feeders, the present invention can achieve continuous feeding without affecting subsequent processes, and the equipment is small in size and low in cost.

[0021] 4. The feeders of the present invention can be two or more connected in parallel to ensure that at least one feeder is in the feeding state, thereby enabling continuous feeding;

[0022] 5. The feeder of the present invention has no rotating parts, the powder is not easily worn, it does not affect the powder particle size, has no impact on subsequent processes, the equipment is not easily worn, and has a long service life;

[0023] 6. The feeder of the present invention is provided with an air venting structure, which can lead out a portion of the feeding air, reduce the amount of feeding air entering the subsequent process, and reduce the impact on the subsequent process. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the feeder of the present invention;

[0025] Figure 2 This is a schematic diagram of the feeder structure;

[0026] Figure 3 This is a schematic diagram of the particle size measurement results during the experiment;

[0027] Figure 4 This is a schematic diagram showing the measurement results of the feeding rate during the experiment.

[0028] Figure descriptions: 1-Vent flow meter, 2-Vent regulating valve, 3-Cover plate, 4-Discharge pipe, 5-Guide, 501-End plate, 502-Vent hole, 503-Guide cylinder, 504-Inner cylinder, 505-Sealing plate, 506-First space, 507-Second space, 6-Storage cylinder, 7-Powder storage space, 8-Weighing sensor, 9-Base plate, 10-Data acquisition device, 11-Gas distributor, 12-Compressed air inlet pipe, 13-Inlet regulating valve, 14-Inlet flow meter, 15-Filter plate, 16-Vent pipe. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0030] Please refer to Figure 1 and 2 The powder micro-feeding device comprises a powder storage cylinder 6 for storing powder, a powder guide 5 movably arranged in the powder storage cylinder 6, the powder guide 5 comprising a powder guide cylinder 503, one end of the powder guide cylinder 503 being in contact with a powder surface, the powder guide cylinder 503 being further connected with a powder discharge pipe 4 and a gas blowing mechanism, the powder discharge pipe 4 extending to the outside of the powder storage cylinder 6, and the gas blowing mechanism being directed towards the powder surface.

[0031] In use, the powder is first stored in the powder storage cylinder 6, then the one end of the powder guide cylinder 503 is brought into contact with the powder surface, and then the gas blowing mechanism is used to blow gas towards the powder surface, the gas impacting on the powder surface lifts up the powder, the lifted-up powder is transported to the outside of the powder storage cylinder 6 through the powder discharge pipe 4, and the powder feeding process can be realized by extending the powder discharge pipe 4 to the equipment requiring powder according to actual requirements, the amount of lifted-up powder can be controlled by controlling the blowing amount and blowing speed of the gas blowing mechanism, thereby adjusting the feeding amount, and through experiments, by adjusting the blowing amount and blowing speed of the gas blowing mechanism and matching with a powder discharge pipe 4 of appropriate size, the present application can realize micro-feeding of 0-1.5g / s. During the feeding process, because the gas only contacts the powder surface, it will not cause disturbance to the whole powder, and the lifted-up powder is only the powder at the powder surface, and the uniformity of the particle size is good. With the continuous progress of the feeding process, the powder in the powder storage cylinder 6 gradually reduces, but the one end of the powder guide cylinder 503 is always in contact with the powder surface, so the whole feeding process has good stability and is easy to control the feeding amount. In the present application, the gas used by the gas blowing mechanism can be air or inert gas, the cost is lower when air is used, and the reaction with the powder can be avoided when inert gas is used, and in actual application, the specific components of the powder can be selected according to the specific components of the powder.

[0032] To more accurately control the feeding amount, the feeder also includes a weighing sensor 8, with the storage cylinder 6 vertically mounted on the weighing sensor 8. The weighing sensor 8 allows for real-time weighing of the storage cylinder 6, powder, and feeder 5. Subtracting the pre-known weights of the storage cylinder 6 and feeder 5 yields the real-time weight of the powder. Combined with the feeding time, the powder supply rate can be calculated, thereby correcting the air volume and speed of the blowing mechanism, achieving precise control of the feeding amount and speed. The weighing sensor 8 is connected to a host computer via a data acquisition device 10. During the feeding process, the host computer collects the weighing data from the weighing sensor 8 in real-time through the data acquisition device 10. Both the data acquisition device 10 and the host computer are standard setups in this field and will not be described further here. On the other hand, by vertically positioning the storage cylinder 6, powder is added and falls to the bottom of the cylinder, with the powder surface being horizontal. Based on this, the feeder 5 can be directly placed on the powder surface. As the powder is continuously fed out, the powder surface gradually descends, and the feeder 5 descends synchronously with the powder surface under gravity, always remaining in contact with it. This eliminates the need for additional driving mechanisms for the feeder 5, reducing the complexity of the feeder structure and the feeding process. The lower end of the storage cylinder 6 is also enclosed by a base plate 9, creating a stable powder storage space 7 within the cylinder 6 for storing the powder.

[0033] Because the powder is conveyed by airflow from the blowing mechanism, excessive airflow may adversely affect subsequent powder processing. To avoid this, a venting mechanism is detachably installed at the upper end of the storage cylinder 6. The venting mechanism can discharge excess gas, reducing the amount of gas conveyed to subsequent processes through the discharge pipe 4, thus preventing interference with subsequent processes.

[0034] The specific structure of the venting mechanism is as follows: The venting mechanism includes a cover plate 3 detachably connected to the upper end of the storage cylinder 6. A venting pipe 16, communicating with the storage cylinder 6, is installed on the cover plate 3. A venting regulating valve 2 and a venting flow meter 1 are installed on the venting pipe 16, with the venting flow meter 1 located on the outlet side of the venting regulating valve 2. During the process of adding powder to the storage cylinder 6 and loading the feeder 5, the cover plate 3 can be removed first for easy operation. When venting is required, the venting regulating valve 2 is opened to start venting. During the venting process, the venting flow meter 1 monitors the venting volume in real time, thereby adjusting the venting regulating valve 2 to control the venting speed and volume. This prevents excessive gas from entering the subsequent process through the discharge pipe 4, and also prevents excessive venting from causing the powder to be unable to be smoothly transported to the outside through the discharge pipe 4. The cover plate 3 is connected to the storage cylinder 6 via a flange.

[0035] In view of the fact that some powder may flow out of the storage cylinder 6 through the deflation pipe 16 during deflation, resulting in waste of powder and pollution of the surrounding environment, the deflation mechanism comprises a filter plate 15 which is detachably arranged in the storage cylinder 6. The deflated gas can be filtered through the filter plate 15 to filter out the powder carried in the gas, thereby avoiding the outflow of powder. In addition, the detachable arrangement of the filter plate 15 facilitates the addition of powder to the storage cylinder 6 and the placement of the material guide 5 into the storage cylinder 6. Since the discharge pipe 4 needs to extend outside the storage cylinder 6, a through hole for accommodating the discharge pipe 4 needs to be formed in the storage cylinder 6, and the through hole is located below the filter plate 15 and is in sealing connection with the discharge pipe 4. The filter plate 15 is connected to the storage cylinder 6 through a flange.

[0036] The specific structure of the material guide cylinder 503 is that the material guide cylinder 503 comprises an integrally connected conical cylinder segment and a cylindrical segment, the large end of the conical cylinder segment is in communication with one end of the cylindrical segment, the other end of the cylindrical segment is in communication with the powder surface, and the discharge pipe 4 and the blowing mechanism are in communication with the conical cylinder segment. After the gas flow sent by the blowing mechanism blows on the powder surface, the raised powder moves to the small end of the conical cylinder segment through the cylindrical segment and gradually accumulates, so that smaller gas flow can send the powder into the discharge pipe 4, further avoiding excessive gas entering the subsequent equipment through the discharge pipe 4 to adversely affect the subsequent process, and avoiding a large amount of powder adhering to the inner wall of the material guide cylinder 503, thereby avoiding waste of powder and facilitating accurate control of the amount of powder.

[0037] Since deflation may be required, in order to ensure that the gas in the material guide cylinder 503 can be smoothly deflated, the small end of the conical cylinder segment is fixedly connected with an end plate 501, a plurality of deflation holes 502 are formed in the end plate 501, and the discharge pipe 4 is arranged on the end plate 501. When deflation is required, part of the gas in the material guide cylinder 503 can enter the storage cylinder 6 through the deflation holes 502, and then be discharged to the outside through the filter plate 15 and the deflation pipe 16, thereby completing deflation. The deflation holes 502 can balance the pressure inside and outside the material guide cylinder 503, thereby avoiding the material guide cylinder 503 from being empty and difficult to fall due to excessive internal pressure. The discharge pipe 4 is preferably coaxially arranged with the conical cylinder segment, i.e. the discharge pipe 4 is arranged at the center of the end plate 501, so that the powder can uniformly enter the discharge pipe 4, thereby avoiding the accumulation of powder on the end plate 501.

[0038] In order to improve the stability of the material guiding cylinder 503 on the material surface, the inner cylinder 504 is coaxially arranged in the inner part of the cylindrical section, the inner cylinder 504 extends into the conical section and is sealingly and fixedly connected with the conical section, and the closed plate 505 is fixedly connected between the inner cylinder 504 and the cylindrical section. By arranging the inner cylinder 504 and the closed plate 505, the contact area of the material guiding device 5 with the material surface can be increased, so as to avoid the lateral inclination of the material guiding device 5, realize the effect of improving the stability of the material guiding device 5, and further avoid the shaking of the material guiding device 5 to drive the shaking of the discharge pipe 4 and the air inlet mechanism, thereby improving the stability of the feeding process. On the basis of arranging the inner cylinder 504, the conical section and the inner cylinder 504 are communicated and form a first space 506, and the conical section, the cylindrical section, the inner cylinder 504 and the closed plate 505 enclose a second space 507, and the gas and the powder flow in the first space 506.

[0039] The specific structure of the air blowing mechanism is that the air blowing mechanism comprises a compressed air inlet pipe 12 arranged on the material guiding cylinder 503, the compressed air inlet pipe 12 is connected with a gas distributor 11 after extending into the material guiding cylinder 503, and the gas outlet of the gas distributor 11 faces the material surface of the powder. In use, the compressed air inlet pipe 12 is connected with an air inlet device such as a gas pump, and the gas flow enters the gas distributor 11 through the compressed air inlet pipe 12, and the gas is uniformly dispersed under the action of the gas distributor 11, and then uniformly blown to the material surface, so that the powder at the position of the material surface can be uniformly lifted, and then the material surface uniformly descends, avoiding the appearance of a cavity on the material surface to cause internal disturbance of the powder. The gas distributor 11 is a commonly used device in the art, and its specific structure and working principle will not be described here.

[0040] In order to accurately control the air inlet amount of the air blowing mechanism, the compressed air inlet pipe 12 is provided with an air inlet adjusting valve 13 and an air inlet flowmeter 14, and the air inlet flowmeter 14 is located on the outlet side of the air inlet adjusting valve 13. When the gas flows in the compressed air inlet pipe 12, the air inlet amount can be monitored in real time through the air inlet flowmeter 14, and then the air inlet speed is calculated combined with the size of the compressed air inlet pipe 12, and the air inlet speed and the air inlet amount are adjusted through the air inlet adjusting valve 13 to meet the feeding demand.

[0041] In the embodiment, the inner diameter D of the storage cylinder 6 is set to 50-300 mm, the overall length of the guide cylinder 503 is L, the length of the tapered cylinder section of the guide cylinder 503 is L1, the inner diameter of the cylindrical section of the guide cylinder 503 is D1, the inner diameter of the inner cylinder 504 is D2, the hole diameter of the air vent 502 is D4, the number of the air vent 502 is n, the inner diameter of the discharge pipe 4 is also D4, the distance between the gas distributor 11 and the closing plate 505 in the axial direction of the guide cylinder 503 is L2, and on this basis, D1 / D = 0.5-0.99, D3 / D1 = 0.1-0.9, D2 / D1 = 0.2-0.9, D4 / D3 = 0.1-0.4, L1 / L = 0-0.4, L2 / (L-L1) = 0.2-0.8, and n = 2-10.

[0042] A powder micro-feeding method based on the powder micro-feeding device described above, the method comprising S1-S3.

[0043] S1, the powder is added to the storage cylinder 6, and one end of the guide cylinder 503 is in contact with the powder surface. The specific method of S1 comprises S11-S15.

[0044] S11, the cover plate 3 and the filter plate 15 are removed from the storage cylinder 6, and the guide cylinder 503 is taken out of the storage cylinder 6.

[0045] S12, the powder is added to the storage cylinder 6, and the relationship between the height h of the powder and the overall height H of the storage cylinder 6 is ≤0.8H.

[0046] S13, the guide cylinder 503 is placed into the storage cylinder 6, and the lower end of the guide cylinder 503 is in contact with the powder surface.

[0047] S14, the cover plate 3 and the filter plate 15 are connected to the storage cylinder 6, and the connection between the cover plate 3 and the storage cylinder 6 is sealed to prevent air leakage.

[0048] S15, the storage cylinder 6 is placed on the weighing sensor 8, and the value of the weighing sensor 8 is read by the upper computer and the data acquisition device 10.

[0049] It should be noted that in order to ensure that the guide cylinder 5 can be smoothly taken out and placed in S11 and S13, the discharge pipe 4 and the compressed air inlet pipe 12 are provided as hoses, and the material can be selected as silica gel or other material hoses, which are selected according to the working conditions.

[0050] S2, the powder is blown up by the blowing mechanism and transported to the outside of the storage cylinder 6 through the discharge pipe 4.

[0051] The specific method of S2 comprises

[0052] S21, opening the inlet air regulating valve 13 to make the inlet air device send air into the gas distributor 11 through the compressed air inlet pipe 12, and the gas distributor 11 distributes the air to form the charging air and make the charging air blow to the material surface.

[0053] S22, the charging air lifts the powder at the material surface into the first space 506, and then the charging air carries the powder out of the storage cylinder 6 through the discharge pipe 4, in the process, the material surface continuously descends and the material guide 5 synchronously descends with the material surface.

[0054] S23, when the air pressure in the material guide 503 is too high, the air is discharged into the storage cylinder 6 through the air vent hole 502 on the end plate 501, so as to balance the air pressure inside and outside the material guide 503, avoid the internal air pressure being too high to lift the material guide 503, and make the material guide 503 separate from the material surface.

[0055] S24, the weighing sensor 8 measures the residual amount of the powder in the storage cylinder 6 in real time, and the host computer reads the data of the weighing sensor 8 through the data acquisition device 10, and calculates the charging speed and the charging amount according to the residual amount of the powder.

[0056] S25, when the air needs to be discharged, the air discharge regulating valve 2 is opened, so that the air in the storage cylinder 6 is discharged outside the storage cylinder 6 through the filter plate 15 and the air discharge pipe 16 in turn, and in the process, the filter plate 15 filters the powder carried by the air into the storage cylinder 6.

[0057] In order to verify the actual effect of the present application, the following test is carried out.

[0058] The size constraint conditions of the feeder in the test are D1 / D=0.90, D3 / D1=0.30, D2 / D1=0.40, D4 / D3=0.20, n=6, L1 / L=0.30 and h=0.6H, the powder selected is the catalyst particles with a median diameter of 19.0 μm, and the air sent by the air blowing mechanism is selected as the air at normal temperature.

[0059] At the three stages of the highest material level (when the test starts), the intermediate material level (when the catalyst particles are used up by half) and the lowest material level (when the catalyst particles are about to be used up), multiple sampling is carried out at the outlet of the discharge pipe 4, and the particle size distribution of the catalyst particles is measured, and the average median diameter of the catalyst particles discharged at the three stages is obtained, and the results are shown in Table 1. Figure 3 As can be seen from Table 1, the average median diameter of the catalyst particles discharged by the feeder at the three stages of the highest material level, the intermediate material level and the lowest material level is 18.45 μm, 19.16 μm and 18.92 μm respectively, which is basically the same as the original median diameter 19.0 μm of the catalyst particles, and there is no phenomenon of large change in the median diameter of the catalyst particles, which indicates that the particle size uniformity of the added powder is good.

[0060] The intake air adjusting valve 13 was adjusted to make the intake air flow shown by the intake air flow meter 14 be 2.0 m 3 / h, and the single test took 73.0 min. The feeding speed was measured and recorded every minute during the test, and the results are shown in Table 1. Figure 4 As can be seen from Table 1, the feeding speed fluctuated slightly within 10.0 min before the test, being 3.3-4.3 kg / h, and the average feeding speed was 4.0 kg / h. Within 10.0-15.0 min, the feeding speed gradually stabilized, and after 15.0 min, the feeding speed stabilized at about 3.6 kg / h, indicating that the feeding speed stability of the powder added by the present application was good.

[0061] The above description of the disclosed embodiments enables those skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will accord with the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A powder microfeeder characterized by: The device comprises a storage cylinder (6) for storing powder, a material guide (5) movably arranged in the storage cylinder (6), the material guide (5) comprises a material guide cylinder (503), one end of the material guide cylinder (503) is in contact with the material surface of the powder, the material guide cylinder (503) is further communicated with a discharge pipe (4) and a blowing mechanism, the discharge pipe (4) extends to the outside of the storage cylinder (6), and the blowing mechanism is directed towards the material surface of the powder. The material guide cylinder (503) comprises a conical cylinder section and a cylindrical section which are integrally connected, the large end of the conical cylinder section is communicated with one end of the cylindrical section, the other end of the cylindrical section is in contact with the material surface of the powder, and the discharge pipe (4) and the blowing mechanism are both communicated with the conical cylinder section. The inside of the cylindrical section is coaxially provided with an inner cylinder (504), the inner cylinder (504) extends into the conical cylinder section and is fixedly connected with the conical cylinder section, and a sealing plate (505) is fixedly connected between the inner cylinder (504) and the cylindrical section.

2. A powder microfeeder as claimed in claim 1, characterized in that: The feeder further comprises a weighing sensor (8), and the storage cylinder (6) is vertically arranged on the weighing sensor (8).

3. A powder microfeeder as claimed in claim 2, characterized in that: The upper end of the storage cylinder (6) is detachably provided with a deflation mechanism.

4. A powder microfeeder as claimed in claim 3, characterized in that: The deflation mechanism comprises a cover plate (3) which is detachably connected with the upper end of the storage cylinder (6), the cover plate (3) is provided with a deflation pipe (16) which is communicated with the storage cylinder (6), and the deflation pipe (16) is provided with a deflation regulating valve (2) and a deflation flowmeter (1).

5. A powder microfeeder as claimed in claim 3, wherein: The deflation mechanism comprises a filter plate (15) which is detachably arranged in the storage cylinder (6).

6. A powder microfeeder as claimed in claim 1, characterized in that: The small-diameter section of the conical cylinder section is fixedly connected with an end plate (501), and the end plate (501) is provided with a plurality of deflation holes (502).

7. A powder microfeeder as claimed in claim 1, wherein: The blowing mechanism comprises a compressed air inlet pipe (12) which is arranged on the material guide cylinder (503), the compressed air inlet pipe (12) is communicated with a gas distributor (11) after extending into the material guide cylinder (503), and the gas outlet of the gas distributor (11) is directed towards the material surface of the powder.

8. A powder microfeeder as claimed in claim 1, characterized in that: The compressed air inlet pipe (12) is provided with an air inlet regulating valve (13) and an air inlet flowmeter (14).

9. A method for micro-feeding powder based on a powder micro-feeder according to claim 1, characterized in that: The method comprises the following steps: S1, powder is added into the storage cylinder (6), and one end of the material guide cylinder (503) is in contact with the material surface of the powder; S2, the blowing mechanism is used to blow air to the powder to make the powder fly up and be transported to the outside of the storage cylinder (6) through the discharge pipe (4).

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