Visual anti-blocking miniature feeding device

Abstract

The utility model relates to the field of feeders, and discloses a visual anti-blocking miniature feeding device. According to the miniature feeding device, the transparent storage hopper marked with scales is adopted, and the discharging amount can be monitored and controlled in real time; the internal space of the discharging pipe, the internal space of the discharging tee joint and the internal space of the storage hopper are communicated through the pressure balance pipe, air flow in the discharging tee joint can be guided into the storage hopper when the air flow assists in discharging, and therefore pressure is conducted into the discharging pipe, positive pressure of a discharging port of the discharging pipe is avoided, discharging is even and smooth, and material blocking is prevented. The lower portion of the stirring shaft is of a bent structure and is integrally formed with the upper portion, materials can be effectively scattered during operation, adhesion is avoided, and the materials are fully stirred to promote discharging. The miniature feeding device is suitable for various powdery and granular materials, discharging is smooth and uniform, material blocking is not prone to occurring, the discharging amount can be monitored in real time, and actual production and use are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of feeders, specifically to a visual anti-clogging micro feeder. Background Technology

[0002] Miniature feeding devices are mainly used to convey powder and granular materials, and are widely used in various industries such as chemical, food, and grinding. They can achieve automated feeding. Due to their small size, light weight, simple installation, and low operating costs, the application range of miniature feeding devices is constantly increasing. The screw feeder with a small feeding capacity, as a type of miniature feeding device, is a reliable and continuous feeding device. It can convey materials in a closed system with good sealing performance, avoiding dust pollution and improving working conditions. It is suitable for horizontal or inclined conveying of powdery and granular materials, such as coal, ash, slag, and cement.

[0003] Micro-feeding devices typically require research into factors such as the mechanical structure of the feeding system, particle size, particle morphology, and flowability to ensure stable and uniform feeding. However, in practical applications, especially when conveying small-sized and hygroscopic powders, the material itself is prone to agglomeration and arching, often resulting in poor feeding and intermittent material flow, severely affecting metering accuracy. Furthermore, it is difficult to obtain the feeding rate in real time and adjust the feeding rate accordingly. Moreover, micro-feeding devices often use airflow-assisted feeding methods, leading to positive pressure at the feeding port, which easily causes material blockage. Therefore, there is a need to design a reasonably designed, widely applicable, easy-to-operate, inexpensive, and non-blocking metering micro-feeding device. Utility Model Content

[0004] The purpose of this invention is to overcome the problems of poor material feeding, easy clogging, and difficulty in real-time monitoring and control of material feeding in existing micro-feeding devices, and to provide a visualized anti-clogging micro-feeding device. This micro-feeding device includes a feeding pipe, a feeding tee, and a storage hopper. The transparent, graduated storage hopper allows for real-time monitoring of the feeding situation, timely adjustment and control of the feeding rate, and real-time monitoring of the feeding amount. The inlet of the storage hopper is sealed with a hopper plug during operation. Its internal space is connected to the internal space of the feeding tee through a side opening and a pressure balance pipe. When airflow-assisted feeding is used, the vertical airflow in the feeding tee is introduced into the storage hopper, thereby transmitting the generated pressure to the feeding pipe, avoiding positive pressure at the feeding port, promoting smooth feeding, and preventing clogging. The lower part of the stirring shaft is bent and integrally formed with the upper part, which can effectively disperse materials during operation to prevent adhesion and fully stir the materials to promote feeding. Through the above design, this micro-feeding device provides smooth and uniform feeding, is less prone to clogging, and allows for real-time monitoring of the feeding amount, which is beneficial for practical production use.

[0005] To achieve the above objectives, this utility model provides a miniature feeding device, which includes a feeding pipe, a feeding tee, and a storage hopper. The storage hopper is positioned above the feeding pipe, and the discharge port at the lower end of the storage hopper is connected to the opening on the side of the feeding pipe. The feeding tee includes a vertically arranged first pipe and a horizontally arranged second pipe, which are interconnected. The discharge port of the feeding pipe is connected to the side opening of the first pipe, and the top opening of the first pipe is connected to the side opening of the storage hopper via a pressure balance pipe. The second pipe has openings at both ends. The storage hopper is made of a transparent material.

[0006] Preferably, a spiral shaft is provided inside the feeding tube.

[0007] Preferably, the screw shaft is electrically connected to the motor, and the motor is located at the end of the feeding pipe away from the discharge port, for driving the screw shaft to rotate and conveying the material from the storage hopper to the feeding tee.

[0008] Preferably, the storage hopper is further equipped with a stirring shaft, a sleeve, a storage hopper plug, and a stirring motor. The stirring shaft is movably sleeved inside the sleeve and extends out of both ends of the sleeve. The sleeve passes through the storage hopper plug and extends out of the top and bottom of the storage hopper plug.

[0009] Preferably, the upper part of the stirring shaft is connected to the stirring motor, the lower part is formed into a curved structure and integrally formed with the upper part, and the bottom end of the stirring shaft extends to the bottom of the storage hopper.

[0010] Preferably, the stirring shaft and the sleeve are sealed together, as are the sleeve and the storage hopper plug.

[0011] Preferably, the two ends of the second tube are an air inlet and an air outlet, respectively, for allowing airflow to pass through the second tube to assist in feeding.

[0012] Preferably, the diameter of the pressure balancing tube is smaller than the diameter of the first tube body.

[0013] Preferably, the side wall of the storage hopper is formed with graduations.

[0014] Preferably, the material of the storage hopper is glass or acrylic.

[0015] The present invention discloses a visual anti-clogging micro-feeding device, comprising a feeding pipe, a feeding tee, and a storage hopper. The transparent, graduated storage hopper allows for real-time monitoring of the feeding process, enabling timely adjustment and control of the feeding rate and ensuring stable feeding volume. The hopper's inlet is sealed with a plug during operation. Its internal space is connected to the internal space of the feeding tee via a side opening and a pressure balance pipe. When airflow-assisted feeding is used, the vertical airflow within the feeding tee is guided into the storage hopper, thereby transmitting the generated pressure to the feeding pipe, preventing positive pressure at the feeding port, promoting smooth feeding, and preventing clogging. The lower part of the stirring shaft is curved and integrally formed with the upper part, adapting to the shape of the hopper's bottom. During operation, it effectively disperses materials to prevent adhesion and fully mixes them to promote feeding. Through this design, the micro-feeding device provides smooth and uniform feeding, is less prone to clogging, and allows for real-time monitoring of the feeding volume, which is beneficial for practical production use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the visual anti-clogging micro-feeding device provided by this utility model.

[0017] Explanation of reference numerals in the attached figures

[0018] 1. Feed pipe; 11. Motor; 12. Spiral shaft; 2. Feed tee; 21. Pressure balance pipe; 22. First pipe body; 23. Second pipe body; 3. Storage hopper; 31. Stirring shaft; 32. Sleeve; 33. Storage hopper plug; 34. Stirring motor. Detailed Implementation

[0019] The specific embodiments of this utility model are described in detail below. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0020] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0021] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of technical features indicated. Therefore, unless otherwise stated, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0022] In the description of this application, the term "comprising" and any variations thereof mean non-exclusive inclusion, meaning that one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added. Terms indicating orientation or positional relationships, such as "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are used to describe the orientation or relative positional relationships shown in the accompanying drawings and are merely for the purpose of simplifying the description of this application. They do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application.

[0023] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] like Figure 1 As shown, this utility model provides a visual anti-clogging micro-feeding device, which includes a feeding pipe 1, a feeding tee 2, and a storage hopper 3. The storage hopper 3 is located above the feeding pipe 1, and the discharge port at the lower end of the storage hopper 3 is connected to the opening on the side of the feeding pipe 1. The feeding tee 2 includes a vertically arranged first pipe body 22 and a horizontally arranged second pipe body 23. The first pipe body 22 and the second pipe body 23 are interconnected, and the discharge port of the feeding pipe 1 is connected to the side opening of the first pipe body 22. The top opening of the first pipe body 22 is connected to the side opening of the storage hopper 3 through a pressure balance pipe 21. The second pipe body 23 has openings at both ends. The storage hopper 3 is made of a transparent material.

[0025] In this utility model, the above design enables the internal spaces of the feeding pipe 1, the feeding tee 2, and the storage hopper 3 to be interconnected, balancing the internal air pressure and preventing the positive pressure caused by the vertical airflow in the feeding tee 2 from causing poor material flow or uneven feeding rate at the feeding port of the feeding pipe 1. At the same time, the pressure balancing pipe 21 can pour the vertical airflow in the first pipe direction of the feeding tee 2 into the storage hopper 3, thereby transferring pressure to the material in the feeding pipe 1 and further promoting feeding. The storage hopper 3, made of transparent material, allows for real-time monitoring of the feeding status, enabling precise adjustment of the feeding rate and stirring rate based on the feeding status, making it easier to control.

[0026] In the miniature feeding device of this utility model, in a preferred embodiment, a spiral shaft 12 is provided inside the feeding pipe 1.

[0027] In the miniature feeding device of this utility model, preferably, the spiral shaft 12 is electrically connected to the motor 11, and the motor 11 is located at the end of the feeding pipe 1 away from the discharge port, for driving the spiral shaft 12 to rotate and conveying the material from the storage hopper 3 to the feeding tee 2. In a specific embodiment of this utility model, the spiral shaft 12 rotates under the drive of the motor 11 within the enclosed space inside the feeding pipe, conveying the powdery or granular material from the discharge port of the storage hopper 3 to the feeding tee 2. The enclosed space facilitates the transfer of pressure from the feeding airflow to the material, promoting smooth feeding.

[0028] In the micro feeding device described in this utility model, in a preferred embodiment, the storage hopper 3 is further equipped with a stirring shaft 31, a sleeve 32, a storage hopper plug 33, and a stirring motor 34. The stirring shaft 31 is movably sleeved inside the sleeve 32 and extends out of both ends of the sleeve 32. The sleeve 32 passes through the storage hopper plug 33 and extends out of the top and bottom of the storage hopper plug 33.

[0029] In this invention, the stirring motor 34 drives the stirring shaft 31 to stir the material, breaking up the adhesion of the material itself, preventing material clumping, preventing material blockage, and ensuring smooth and uniform feeding. With the above structure, the stirring shaft 31 can move up and down in the sleeve 32 as needed, thereby adjusting the length of the stirring shaft 31 extending into the storage hopper 3 during use, controlling the height of the lower part of the bent stirring shaft 31 when stirring the material, adjusting the stirring state at any time, and making the stirring more thorough. When used in conjunction with a transparent storage hopper, it achieves precise control of feeding, making the feeding smooth, uniform, and controllable.

[0030] In the miniature feeding device of this utility model, preferably, the upper part of the stirring shaft 31 is connected to the stirring motor 34, and the lower part is formed into a curved structure and integrally molded with the upper part, and the bottom end of the stirring shaft 31 extends to the bottom of the storage hopper 3. In a specific embodiment of this utility model, the lower part of the stirring shaft 31 is bent to adapt to the bottom diameter of the storage hopper 3, for example, a continuous S-shape, and the bending interval and length can be adjusted according to the material properties to adapt to different stirring requirements. In this utility model, by adopting the above structure, the part of the bottom of the stirring shaft 31 used for stirring can be as close as possible to the bottom inner wall of the storage hopper 3, thereby fully stirring the material and avoiding the material from sticking and clumping together during the operation of the feeder, which would lead to poor feeding; at the same time, directly bending the stirring shaft to form the part used for stirring saves materials and improves the mechanical strength of the stirring shaft due to its integral design, reduces the resistance during stirring, and improves the overall stability of the miniature feeding device.

[0031] In a specific embodiment of this utility model, the material of the stirring shaft 31 can be selected according to the characteristics of the material, such as stainless steel, alloy steel, etc.; the height and bending interval of the lower curved part of the stirring shaft 31 can be adjusted according to the actual use requirements to ensure smooth stirring and avoid material clumping.

[0032] In the micro-feeding device described in this utility model, preferably, the stirring shaft 31 and the sleeve 32, as well as the sleeve 32 and the storage hopper plug 33, are sealed. In this utility model, the above structure ensures that the pressure transmitted from the pressure balance pipe 21 is effectively transferred to the material in the discharge pipe 1, promoting smooth material discharge.

[0033] In the micro-feeding device of this utility model, preferably, the two ends of the second tube 23 have an air inlet and an air outlet, respectively, for allowing airflow to pass through the second tube 23 to assist in feeding. In a specific embodiment of this utility model, the airflow can be provided by conventional methods in the art, such as by an external compressed air tank or blower; the airflow enters through the air inlet of the second tube 23 of the discharge tee 2, and then carries the powdery or granular material falling from the side opening of the first tube 22 of the discharge tee 2 away from the air outlet of the second tube 23, thereby accelerating the material feeding rate and preventing material from accumulating at the discharge pipe opening.

[0034] In the micro-feeding device of this utility model, preferably, the diameter of the pressure balancing pipe 21 is smaller than the diameter of the first pipe body 22. In a specific embodiment of this utility model, the connection between the pressure balancing pipe 21 and the first pipe body 22 is a sealed inverted funnel shape. With the above structure, the pressure balancing pipe 21 can be prevented from being blocked by the powder carried upward by the airflow in the first pipe body 22, and the vertical airflow inside the first pipe body 22 can be guided into the storage hopper 3, and finally the pressure can be transmitted to the material in the discharge pipe 1, reducing the pressure at the discharge port of the discharge pipe 1, and promoting the material in the discharge pipe 1 to enter the first pipe body 22 of the discharge tee 2 at a uniform speed from the discharge port, and then leave the bottom opening of the second pipe body 23 of the discharge tee 2 with the discharge airflow.

[0035] In the micro-feeding device described in this utility model, preferably, the side wall of the storage hopper (3) is formed with graduations. By setting graduations, it is easier to quantitatively control the feeding rate, which is beneficial to use.

[0036] In the miniature feeding device described in this utility model, preferably, the material of the storage hopper 3 is glass or acrylic.

[0037] In one embodiment of this utility model, the method of using the aforementioned visual anti-clogging micro-feeding device includes the following steps:

[0038] Powdered or granular material is added into the storage hopper 3 through the feed inlet at the top of the storage hopper 3. The feed inlet is then sealed with a storage hopper plug 33, which is equipped with a stirring shaft 31 and a sleeve 32. The storage hopper 3 is made of transparent material and has graduations. A side opening connects to one end of the pressure balance pipe 21, and the other end of the pressure balance pipe 21 connects to the upper opening of the vertical first pipe body 22 of the discharge tee 2. The sleeve 32 passes through the storage hopper plug 33 and extends beyond its top and bottom. The stirring shaft 31 is movably fitted inside the sleeve 32, with both ends extending beyond the sleeve 32. A seal is formed between the stirring shaft 31 and the sleeve 32, and between the sleeve 32 and the storage hopper plug 33. The lower part of the stirring shaft 31 is curved and connected to… The upper part is integrally formed and extends to the bottom of the storage hopper 3; then the length of the stirring shaft 31 extending out of the sleeve 32 is adjusted to control the lower curved part of the stirring shaft 31 to reach a suitable stirring height in the material; then, the stirring motor 34 is started to drive the stirring shaft 31 to stir the material in the storage hopper 3, and at the same time the motor 11 is started to drive the spiral shaft 12 to rotate in the discharge pipe 1, pushing the material falling from the discharge port at the bottom of the storage hopper 3 to the discharge port of the discharge pipe 1 away from the stirring motor 34. The material enters the discharge tee 2 through the side opening of the first pipe body 22 of the discharge tee 2; the external airflow enters the discharge tee 2 through one of the openings of the second pipe body 23 of the discharge tee 2, and then carries the material in the discharge tee 2 out through the other opening of the second pipe body 23.

[0039] The following embodiments further illustrate the visual anti-clogging micro-feeding device of this utility model. These embodiments are implemented based on the technical solution of this utility model, providing detailed implementation methods and specific operating procedures. However, the scope of protection of this utility model is not limited to the following embodiments.

[0040] Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods in the art. Unless otherwise specified, the experimental materials used in the following embodiments are commercially available.

[0041] In the following embodiments, the visualized anti-clogging micro-feeding device used is as follows: Figure 1 As shown, specifically, the visualized anti-clogging micro-feeding device includes a feeding pipe 1, a motor 11, a screw shaft 12, a feeding tee 2, a pressure balance pipe 21, a storage hopper 3, a stirring shaft 31, a sleeve 32, a storage hopper plug 33, and a stirring motor 34.

[0042] The motor 11 is located at the end of the feeding pipe 1 away from the discharge port and is used to drive the spiral shaft 12 to rotate; the spiral shaft 12 is located inside the feeding pipe 1 and is used to transport the material from the storage hopper 3 to the feeding tee 2 under the drive of the motor 11.

[0043] The feeding tee 2 includes a vertically arranged first pipe body 22 and a horizontally arranged second pipe body 23. The first pipe body 22 and the second pipe body 23 are interconnected, and the outlet of the feeding pipe 1 is connected to the side opening of the first pipe body 22. The top opening of the first pipe body 22 is connected to the side opening of the storage hopper 3 through a pressure balance pipe 21. The diameter of the pressure balance pipe 21 is smaller than the diameter of the first pipe body 22. The second pipe body 23 has openings at both ends, which are air inlets and air outlets, respectively, for allowing airflow to pass through the second pipe body 23 to assist in feeding.

[0044] The storage hopper 3 is made of transparent material and is located above the discharge pipe 1. The discharge port at the lower end of the storage hopper 3 is connected to the opening on the side of the discharge pipe 1. The stirring shaft 31 is movably sleeved inside the sleeve 32 and extends out of both ends of the sleeve 32. The sleeve 32 passes through the storage hopper plug 33 and extends out of the top and bottom of the storage hopper plug 33. The top of the stirring shaft 31 is connected to the stirring motor 34. The lower part is formed into a curved structure and integrally formed with the upper part, and extends to the bottom of the storage hopper 3. The stirring shaft 31 and the sleeve 32 are sealed together, as are the sleeve 32 and the storage hopper plug 33.

[0045] Example 1

[0046] 0.5 kg of calcium hydroxide powder (75 μm particle size) is added into the storage hopper 3 through the feed inlet at the top of the storage hopper 3. Then, the feed inlet is sealed with a storage hopper plug 33 equipped with a stirring shaft 31 and a sleeve 32. Subsequently, the length of the stirring shaft 31 extending beyond the sleeve 32 is adjusted to control the lower curved part of the stirring shaft 31 to reach a suitable stirring height within the calcium hydroxide powder in the storage hopper 3. Next, the stirring motor 34 is started to drive the stirring shaft 31 to stir the storage hopper. Simultaneously, the motor 11 starts, driving the screw shaft 12 to rotate inside the feeding pipe 1. This pushes the calcium hydroxide powder falling from the discharge port at the bottom of the storage hopper 3 to the discharge port of the feeding pipe 1, away from the motor 11. The calcium hydroxide powder then enters the feeding tee 2 through the discharge port. External airflow enters through the air inlet of the second pipe body 23 at the bottom of the feeding tee 2, and then carries the material in the feeding tee 2 out through the air outlet of the second pipe body 23, completing the feeding process.

[0047] The average feeding rate was measured to be 5 g / min, the feeding rate range was 0.1 g / min, and no material blockage occurred.

[0048] Example 2

[0049] The method of Example 1 was used, except that the calcium hydroxide powder was replaced with 0.5 kg of ash granular material (particle diameter 1 mm). The average feeding rate was measured to be 10 g / min, the feeding rate range was 0.1 g / min, and no material blockage occurred.

[0050] Comparative Example 1

[0051] The method of Example 1 was adopted, except that a micro-feeding device with the pressure balance tube 21 removed was used. The average feeding rate was measured to be 2 g / min, the feeding rate range was 1 g / min, and material blockage occurred after 2 minutes of operation.

[0052] As can be seen from the results of Examples 1 and 2 and Comparative Example 1, the visual anti-clogging micro-feeding device of this utility model can ensure smooth and uniform feeding of both powdery and granular materials without clogging. The feeding situation can be monitored in real time through a transparent hopper with graduations, and the feeding rate can be adjusted and controlled in a timely manner. The internal space of the hopper, the feeding tee, and the feeding pipe is connected by a pressure balance pipe. When feeding is assisted by airflow, the airflow in the feeding tee is introduced into the hopper, thereby transmitting the pressure at the feeding port to the feeding pipe, avoiding positive pressure at the feeding port, promoting smooth feeding, and preventing clogging. The lower part of the stirring shaft is bent to adapt to the shape of the bottom of the hopper, which can effectively disperse the material during operation to prevent adhesion and fully stir the material to promote smooth and uniform feeding. The stirring shaft is movably set in the sleeve, and the top extends a certain length from the top of the hopper, so the stirring height can be adjusted, making it easier to control the stirring state and further ensuring smooth and uniform feeding. The overall visualized anti-clogging micro-feeding device ensures smooth and uniform material feeding with high controllability. It can monitor the feeding amount in real time, effectively preventing material blockage and facilitating practical use.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A micro-dosing device, characterized in that, The micro feeding device comprises a feeding pipe (1), a feeding tee (2) and a storage hopper (3), the storage hopper (3) is arranged above the feeding pipe (1), and a discharge port at the lower end of the storage hopper (3) is in communication with an opening at the side of the feeding pipe (1); the feeding tee (2) comprises a vertically arranged first pipe body (22) and a transversely arranged second pipe body (23), the first pipe body (22) and the second pipe body (23) are in communication with each other, the discharge port of the feeding pipe (1) is in communication with an opening at the side of the first pipe body (22), an opening at the top of the first pipe body (22) is in communication with an opening at the side of the storage hopper (3) through a pressure balance pipe (21), and the two ends of the second pipe body (23) are provided with openings; the material of the storage hopper (3) is transparent material.

2. The micro-dosing device according to claim 1, characterized in that The inside of the feeding pipe (1) is provided with a spiral shaft (12).

3. The micro-dosing device according to claim 2, characterized in that The spiral shaft (12) is electrically connected with a motor (11), and the motor (11) is arranged at one end of the feeding pipe (1) away from the discharge port, for driving the spiral shaft (12) to rotate and conveying the material from the storage hopper (3) to the feeding tee (2).

4. The micro-dosing device according to any of claims 1 to 3, characterized in that The storage hopper (3) is further provided with a stirring shaft (31), a sleeve (32), a storage hopper plug (33) and a stirring motor (34), the stirring shaft (31) is movably sleeved in the sleeve (32) and extends out of the two ends of the sleeve (32), and the sleeve (32) penetrates through the storage hopper plug (33) and extends out of the top and bottom of the storage hopper plug (33).

5. The micro-dosing device according to claim 4, characterized in that The upper part of the stirring shaft (31) is connected with the stirring motor (34), the lower part is formed in a curved structure and integrally formed with the upper part, and the bottom end of the stirring shaft (31) extends to the bottom of the storage hopper (3).

6. The micro-dosing device according to claim 4, characterized in that The stirring shaft (31) and the sleeve (32) are sealed, and the sleeve (32) and the storage hopper plug (33) are sealed.

7. The micro-dosing device according to claim 1 or 2, characterized in that The openings at the two ends of the second pipe body (23) are respectively an air inlet and an air outlet, for making the airflow pass through the second pipe body (23) to assist feeding.

8. The micro-dosing device of claim 1, wherein, The diameter of the pressure balance pipe (21) is smaller than the diameter of the first pipe body (22).

9. The micro-dosing device of claim 1, wherein, A scale is formed on the side wall of the storage hopper (3).

10. The micro-dosing device of claim 1, wherein, The material of the storage hopper (3) is glass or acrylic.

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