Powder quantitative feeding device

Abstract

The utility model discloses a powder quantitative feeding device which comprises a vertically-arranged feeding hopper and a horizontally-arranged material distributing disc, the material distributing disc is arranged at a discharging port of the feeding hopper, and a plurality of discharging holes are formed in the material distributing disc. The scraper blades are connected with the motor through scraper blade shafts and can be driven by the motor to rotate, and the outer end face of each scraper blade is in clearance fit with the inner wall of the circular discharge port; the bottom surface of each scraper is attached to the top surface of the distributing disc and rotates relative to the distributing disc; the bottom surface of the rear side of each scraper blade in the rotating direction is a horizontal plane attached to the top surface of the material distribution disc; an included angle of 5-10 degrees is formed between the bottom surface of the front side of the scraper blade in the rotating direction and the horizontal plane to form a crack, and the crack is wide outside and narrow inside; the front side face of the scraper blade in the rotating direction is a front inclined face which forms an angle of 30-60 degrees with the horizontal plane, and the front inclined face is low inside and high outside. And each blanking hole can be an inclined hole. The feeding device is relatively high in powder quantification accuracy in the feeding process.

Description

Technical Field

[0001] The utility model relates to the technical field of powder production equipment, in particular to a powder quantitative feeding device. Background Art

[0002] There are many types of powder feeding devices in the prior art with different structures. Among them, the powder feeding device with a scraper at the discharge port of the hopper and a distribution plate with a plurality of discharge holes has relatively good dispersion of the discharged material.

[0003] However, there is still some room for improvement in the powder feeding device of the prior art. For example, some scrapers do not rotate while the distribution plate rotates, some scrapers do not match the circular discharge port and the distribution plate reasonably, and some scrapers use a brush to brush the powder. Their common disadvantage is that the quantitative accuracy of each powder feeding is not enough. The contact between the existing scrapers and the distribution plate is rigid contact, and the friction between the scrapers and the distribution plate is not well controlled. Either the gap is too large and the powder pushing amount is insufficient, which affects the feeding efficiency, or the gap is too small to easily generate noise and cause mutual wear, which affects the service life. There are also scraper shapes that make it difficult to achieve both accurate extrusion of quantitative powder and normal and reasonable friction between the two to maintain a long service life. In addition, when there is no interaction between the scraper and the distribution plate, a small amount of powder leakage is prone to occur due to the free flow of powder on the top surface of the distribution plate and the discharge hole, which further affects the accuracy of the quantitative powder feeding. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a powder quantitative feeding device with relatively high powder quantitative accuracy during the feeding process.

[0005] The technical solution of the utility model is to provide a powder quantitative feeding device, including a feed hopper and a distribution plate, wherein the distribution plate is arranged at the discharge port of the feed hopper, and the distribution plate has a plurality of discharge holes; the utility model provides a powder quantitative feeding device, further comprising at least two scrapers connected to the scraper driving mechanism via a scraper shaft and capable of being driven to rotate by the scraper driving mechanism, wherein the outer end surface of each scraper is gap-matched with the inner wall of the circular discharge port; the bottom surface of each scraper is in contact with the top surface of the distribution plate and can rotate relatively.

[0006] After adopting the above structure, the powder quantitative feeding device of the utility model has the following advantages:

[0007] The multiple material discharge holes can be understood as dozens, hundreds, tens or thousands, or can also be called several.

[0008] Compared with the powder quantitative feeding device in the above-mentioned prior art, the scraper rotates instead of the dividing plate, the end face of the scraper cooperates reasonably with the inner wall of the circular discharge port, the bottom surface of the scraper fits with the top surface of the dividing plate, and the powder is scraped by the scraper itself, so the shortcomings of the above-mentioned prior art are overcome, and the accuracy of the powder quantitative feeding each time the scraper rotates one circle is greatly improved, that is, the powder quantitative accuracy during the feeding process is relatively high, and powder blockage will not occur.

[0009] Furthermore, a plurality of the scrapers are symmetrically arranged on a short sleeve scraper seat along the scraper axis, the short sleeve scraper seat is circumferentially limited and axially movable and sleeved on the scraper shaft, and an elastic device for elastically pressing the scraper is provided between the top of the short sleeve scraper seat and the scraper shaft. After adopting the above structure, while the short sleeve scraper seat applies pressure to the elastic device such as a compression spring, the elastic device can apply compensation force to the scraper seat, so that the scraper can automatically adjust the magnitude of the force applied to the top surface of the material distribution plate, which not only ensures that the bottom surface of the scraper, i.e., the powder scraping surface, is always in contact with the scraper, but also does not generate noise or cause mutual wear due to excessive force applied by the bottom surface of the scraper on the top surface of the material distribution plate, thereby extending the service life of the scraper and the material distribution plate.

[0010] Furthermore, the top view shape of each scraper is a rectangle, and the rear bottom surface in the direction of rotation of the scraper is a horizontal plane that fits the top surface of the distribution plate; the front bottom surface in the direction of rotation of the scraper forms a gap with the horizontal plane at an angle of 5°-10°, and the gap is wide outside and narrow inside; the front side surface in the direction of rotation of the scraper is a front inclined surface that is 30°-60° with the horizontal plane, and the front inclined surface is low inside and high outside. After adopting the above structure, the front inclined surface of the scraper pushes the powder to rotate in the direction of rotation of the scraper, and the gap of the scraper can apply an extrusion force to the powder during the rotation of the scraper, so that the powder gathers toward the powder scraping surface. The horizontal surface of the scraper is the powder scraping surface, which can scrape the powder on the top surface of the distribution plate into the discharge hole of the distribution plate and then fall. The shape of this scraper not only realizes the accurate extrusion of a certain amount of powder, but also makes the friction between the scraper and the distribution plate normal and reasonable to maintain a long service life.

[0011] Furthermore, each feeding hole is an inclined hole. With the above structure, the problem of a small amount of powder leakage due to the free flow of powder on the top surface of the distribution plate and the feeding hole when there is no interaction between the scraper and the powder plate is overcome, which further ensures the accuracy of the quantitative feeding of powder.

[0012] Furthermore, the inclined direction of the inclined hole is: when the scraper rotates, the vertical projection of the front straight edge is first tangent to the top of the inclined hole and then to the bottom of the inclined hole. With the above structure, the phenomenon of a small amount of powder leakage that is prone to occur when the powder flows freely is overcome, and because the inclined angle of the inclined hole faces the scraper, the powder on the top surface of the distribution plate naturally enters the inclined hole and then falls as each scraper rotates, ensuring smooth and uniform powder feeding.

[0013] Furthermore, the feed hopper is a feed funnel, and there is a funnel cover on the top of the feed funnel, and there is a feed pipe on the funnel cover. The scraper drive mechanism is fixed on the funnel cover, and the output shaft of the scraper drive mechanism is connected to the scraper shaft in a driving manner. The scraper shaft is coaxial with the circular feed funnel and the circular discharge port. The scraper shaft is also fixed with a first stirring frame whose edge is matched with the inner wall gap of the circular feed funnel and is used to scrape the powder on the inner wall of the feed funnel. The bottom end of the scraper shaft rotates and fits in the center hole of the distribution plate. After adopting the above structure, it can effectively prevent the powder from sticking to the inner wall of the feed funnel, and continuously push the powder downward to the discharge port, which effectively ensures the smoothness of the feed of the feed funnel, makes the quantitative feeding of the powder smoother, and ensures the verticality, coaxiality and rotation stability and reliability of the scraper shaft. It is also more convenient to install.

[0014] Furthermore, the first stirring frame is fixed on the scraper shaft via a long sleeve; the short sleeve scraper seat is also movably fitted in the bottom end of the long sleeve, and there is a compression spring between the top of the short sleeve scraper seat and the step surface at the bottom end of the long sleeve. After the elastic device between the short sleeve scraper seat and the scraper shaft adopts the above specific structure, while the short sleeve scraper seat gives pressure to the compression spring, the compression spring can give compensation force to the scraper seat, further enabling the scraper to automatically adjust the size of the force acting on the top surface of the material distribution plate, further ensuring that the bottom plane of the scraper, i.e., the powder scraping surface, is always in contact with the scraper, and the scraper will not be damaged due to excessive force of the bottom plane of the scraper on the scraper, thereby further extending its service life.

[0015] Furthermore, the material distribution plate is circular, and the plurality of material discharge holes are arranged in multiple rows along the circumference, with equal distances between rows, equal distances between adjacent material discharge holes in each row, and the outer circular edges of the plurality of material discharge holes are equal to the inner diameter of the circular discharge port. With the above structure, the technical effect of quantitative uniform dispersion and the accuracy of quantitative feeding is further ensured.

[0016] Furthermore, the angle between the center line of each row of feeding holes and the diameter line of the material distribution plate is 5°-15°, and the feeding holes of each row are connected end to end for continuous feeding. With the above structure, during the process of the symmetrical scraper rotating and scraping the powder, a uniform and continuous feeding state can be presented at any straight line position, further ensuring the technical effect of quantitative uniform dispersion and ensuring the accuracy of quantitative feeding.

[0017] Furthermore, there is a pair of circular flanges at the discharge port, and a pair of grooves for accommodating and fixing the distribution disc are provided on the inner circle of the joint surface of the pair of circular flanges. After adopting the above structure, the distribution discs of different thicknesses and different apertures can be replaced according to the actual needs of quantitative discharge. For example, under the same working conditions, the thicker the distribution disc, the less powder output, and the larger the aperture, the greater the powder output, so as to adjust the powder output of the distribution disc or the feed amount of the device within a smaller range.

[0018] Furthermore, a discharge funnel is fixed on the lower flange of the pair of flanges, and a stirring shaft fixed coaxially with the scraper shaft is inside the discharge funnel. The stirring shaft is fixed with a second stirring frame whose edge is matched with the inner wall gap of the circular discharge funnel and is used to scrape the powder on the inner wall of the discharge funnel. With the above structure, the unimpeded and quick feeding of the discharge below the material distribution plate, i.e., the downstream feeding of the device to the production line, is further ensured, and the technical effect of quantitative uniform dispersion and the accuracy of quantitative feeding is further ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the longitudinal structure of a powder quantitative feeding device of the utility model (bolts and nuts are not shown in the figure; the same applies to the following figures).

[0020] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the mounting frame.

[0021] Figure 3 yes Figure 1 Schematic diagram of the top view of the material distribution plate.

[0022] Figure 4 yes Figure 1 Schematic diagram of the structure of the scraper assembly.

[0023] Figure 5 yes Figure 1 Schematic diagram of the structure of the scraper shaft.

[0024] Figure 6 yes Figure 1 Schematic diagram of the structure of the stirring shaft.

[0025] Figure 7 yes Figure 1 Schematic diagram of the structure in which the first stirring frame is rotatably mounted on the cover plate via the scraper shaft.

[0026] Figure 8 yes Figure 1 Schematic diagram of the enlarged structure of A.

[0027] As shown in the figure:

[0028] 1. Feed funnel assembly, 11. Feed funnel, 12. Discharge port, 13. Scraper shaft, 131. Cross pin, 14. Motor, 15. Funnel cover, 16. Bearing seat, 17. Bearing, 18. First stirring frame, 19. Long sleeve, 191. Step surface, 110. Compression spring;

[0029] 2. material distribution plate, 21. material discharge hole, 22. top surface of material distribution plate, 23. outer circle edge, 24. center line, 25. diameter line, 26. center hole;

[0030] 3. scraper assembly, 31. short sleeve scraper seat, 32. scraper, 321. outer end surface, 322. bottom horizontal surface, 323. front bottom surface, 324. front side surface;

[0031] 4. Circular flange, 41. Groove;

[0032] 5. discharging funnel, 51. stirring shaft, 52. second stirring frame;

[0033] 6. Mounting bracket. DETAILED DESCRIPTION

[0034] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these specific embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various specific embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 shown.

[0036] The utility model discloses a powder quantitative feeding device, comprising a feed hopper and a distribution plate 2. The feed hopper can be a feed funnel 11 with a cylindrical top and a conical or truncated cone shape with a large top and a small bottom. The feed hopper can be set obliquely, or it can be fed by a stirring device, a propulsion device, etc. instead of a feed funnel. Of course, the feed hopper is preferably a vertical or vertically set feed funnel 11, and gravity is used for feeding. The distribution plate 2 can be horizontally set at the discharge port 12 of the feed funnel 11. The distribution plate is generally set horizontally. When set horizontally, it is also possible to be not completely horizontal. Of course, it is preferred that the distribution plate is set horizontally. There are multiple feed holes 21 on the distribution plate 2. The utility model discloses a powder quantitative feeding device, and also includes at least two scrapers 32 connected to a scraper drive mechanism such as a motor 14 through a scraper shaft 13 and can be driven to rotate by the motor 14. The multiple of the multiple feed holes 21 can also be called a number, such as dozens, hundreds, tens, thousands, etc. The powder quantitative feeding device can be installed on the rectangular hollow mounting frame 6. The feed hole 21 is also called a feed hole or a discharge hole.

[0037] The outer end surface 321 of each scraper 32 is in clearance fit with the inner wall of the circular discharge port 12. The bottom surface of each scraper 32 is in contact with the top surface 22 of the material distribution plate and can rotate relative to it. Relative rotation is also called relative rotation. That is, at least two scrapers 32 symmetrically fixed such as welded on the short sleeve scraper seat 31 described below can be driven by a scraper driving mechanism such as a motor 14 to rotate relative to the inner wall of the circular discharge port 12 and the top surface 22 of the material distribution plate.

[0038] Each scraper 32 may be rectangular in top view, and the scraper 32 may rotate in a direction such as Figure 4 The rear bottom surface rotating in the clockwise direction is a horizontal surface that fits the top surface 22 of the material distribution plate, and the horizontal surface is also called the bottom horizontal surface 322. The front bottom surface 323 of the scraper 32 in the rotation direction forms a gap with the horizontal plane, that is, the bottom horizontal surface 322, at an angle of 5°-10°, and the gap is wide outside and narrow inside. The front side surface 324 in the rotation direction of the scraper 2 is a front inclined surface at an angle of 30°-60° to the horizontal plane, and the front inclined surface is low inside and high outside. The horizontal plane here can be understood as the bottom horizontal surface 322, that is, the angle between the front side surface 324 and the bottom horizontal surface 322 can be 30-60°. The cross section of the scraper 32 can be a pentagon, that is, each scraper 32 can be a long scraper of a pentagon. It is not difficult to understand that the front side surface 324 of the scraper 32 is adjacent to the front bottom surface 323, and the front bottom surface 323 is adjacent to the bottom horizontal surface 322.

[0039] Each of the feed holes 21 can be an inclined hole.

[0040] The inclined direction of the inclined hole can be: the vertical projection of the scraper 32 when rotating is first tangent to the top end of the inclined hole and then tangent to the bottom end of the inclined hole.

[0041] The scraper can also be in a crescent shape, sickle shape or other curved shape when viewed from above.

[0042] The top surface 22 of the distribution plate and the inner surface of the discharge hole 21 can be sandblasted to reduce a small amount of powder leakage caused by the free flow of powder in the top surface 22 of the distribution plate and the discharge hole 21 when the scraper 32 does not interact with the distribution plate 2.

[0043] It is not difficult to understand that the stirring drive mechanism generally adopts an electric motor or a motor, and the upwardly extending end of the stirring shaft 15 can be driven by the motor shaft through a transmission belt or a gear box, but it is preferred that the output shaft of the stirring motor 14 is coaxially connected to a stirring shaft 15.

[0044] The following may be referred to as a feed hopper assembly 1: a hopper cover 15 is provided on the top of the feed hopper 11, and a feed pipe 111 is provided on the hopper cover 15. The scraper driving mechanism generally adopts an electric motor or motor 14, which can be vertically fixed on the hopper cover 15 via a fixing seat 112, and the output shaft of the motor 14 can be connected to the top of the scraper shaft 13 via a transmission belt or a gear box, and the output shaft of the motor 14 is at the lower end of the motor 14 and is preferably coaxially connected to the scraper shaft 13. Of course, the scraper driving mechanism can also be a pneumatic motor or a hydraulic motor, and the output shaft of the pneumatic motor or the output shaft of the hydraulic motor can be connected to the upwardly extending end of the scraper shaft via a transmission belt or a gear box, or the upwardly extending end of the scraper shaft is coaxially connected to the output shaft of the pneumatic motor or the output shaft of the hydraulic motor. The feed funnel assembly 1 may further include a bearing seat 16, and the scraper shaft 13 may be rotatably matched with the bearing seat 16 via bearings 17, such as upper and lower bearings 17, such as the inner ring of each bearing 17 is interference-fitted with the scraper shaft 13, and the outer ring of each bearing 17 is tightly fitted in the bearing seat 16. The bearing seat 16 may be a part of the fixed seat 112. The scraper shaft 13 is coaxial with the circular feed funnel 11 and the circular discharge port 12, and the scraper shaft 13 is also fixed with a first stirring frame 18 whose edge is gap-fitted with the inner wall of the circular feed funnel 11 and is used to scrape the powder on the inner wall of the feed funnel 11, and the bottom end of the scraper shaft 13 is rotatably matched in the center hole 26 of the distribution plate 2. It is not difficult to understand that the scraper shaft 13 also serves as the shaft of the first stirring frame 18 or the first stirring frame shaft.

[0045] A plurality of scrapers are symmetrically arranged on a short sleeve scraper seat along the scraper axis. For example, two scrapers 32 are symmetrically arranged on a short sleeve scraper seat 31. The short sleeve scraper seat 31 is circumferentially limited and axially movable on the scraper shaft 13. There is an elastic device between the top end of the short sleeve scraper seat 31 and the scraper shaft 13 for elastically pressing the scraper 32. It is not difficult to understand that the scraper 32 is elastically pressed through the short sleeve scraper seat 31.

[0046] The elastic device between the short sleeve scraper seat 31 and the scraper shaft 13 can adopt the following specific structure: the first stirring frame 18 is fixed on the scraper shaft 13 through a long sleeve 19. Two scrapers 32 are symmetrically arranged on a short sleeve scraper seat 31, such as welding. The short sleeve scraper seat 31 is limited in the circumferential direction and axially movable in the bottom end of the long sleeve 19. There is a compression spring 110 between the top of the short sleeve scraper seat 31 and the step surface 191 at the lower end of the long sleeve 19. The compression spring is also called a support spring. The specific structure of the short sleeve scraper seat 31 that is circumferentially limited and axially movable and sleeved in the bottom end of the long sleeve 19 can be: the short cylindrical scraper seat 31 is axially movable and sleeved in the lower end of the long cylinder 19 and outside the lower end of the scraper shaft 13, and the short cylindrical scraper seat 31 is symmetrically provided with two vertical long waist-shaped holes 311, and the two ends of a cross pin 131 fixed to the lower end of the scraper shaft 13 extend into the long waist-shaped holes 311 to limit the short cylindrical scraper seat 31 circumferentially, that is, the short cylindrical scraper seat 31 rotates with the scraper shaft 13 to drive the two symmetrical scrapers 32 to rotate, and can move axially up and down to automatically adjust the strength of the bottom horizontal surface 322 of the scraper 2, that is, the powder scraping surface, and the top surface 22 of the material distribution plate. It is not difficult to understand that the bottom surface of the short sleeve scraper seat 31 and the bottom horizontal surface 322 of the scraper 2 are on the same horizontal plane. The short sleeve scraper seat 31 and the two symmetrically arranged scrapers 32 can be called a scraper assembly 3. The scraper can also be four pieces evenly distributed along the circumference. The convenient installation described in the above utility model can be understood as follows: the scraper of the feeding device in the prior art is generally fixed by hard connection such as welding. During the installation and debugging stage before each use, it is necessary to check whether the distance between the scraper and the material distribution plate is qualified. If it is not qualified, the feeding device must be disassembled and reassembled to adjust the position of the scraper. After adopting the above structure, there is no need to repeatedly disassemble and adjust the position, which greatly saves the installation time.

[0047] The material distribution plate 2 can be circular, and the plurality of material discharge holes 21 can be arranged in multiple rows along the circumference, with equal distances between rows, and the distances between adjacent material discharge holes 21 in each row are equal, and the outer circular edges 23 of the multiple rows of material discharge holes 21 are equal to the inner diameter of the circular discharge port 12. The diameter of the material discharge holes 21 can be 1-2 mm. The multiple rows arranged along the circumference here can also be understood as multiple rows arranged radially.

[0048] The angle between the center line 24 of each row of discharge holes 21 and the diameter line 25 of the distribution plate 2 can be 5°-15°, such as 10°.

[0049] A pair of circular flanges 4 are arranged at the discharge port 12, wherein one of the circular flanges 4 has a groove 41 for accommodating and fixing the material distribution plate 2 on the inner circle of the circular flange 4. The two sides of the circular material distribution plate 2 may have notches for positioning and preventing circumferential rotation.

[0050] A discharge funnel 5 is fixed at the bottom of the lower circular flange 4 of the pair of circular flanges 4. A stirring shaft 51 is fixed coaxially with the scraper shaft 13 in the discharge funnel 5. A second stirring frame 52 is fixed on the stirring shaft 51, the edge of which is in clearance with the inner wall of the circular discharge funnel and is used to scrape the powder on the inner wall of the discharge funnel 5. The stirring shaft 51 can also be called a second stirring frame shaft.

[0051] It is not difficult to understand that the utility model is a powder quantitative feeding device supported on an electronic scale through the four legs of the mounting frame 6, and the weight of the powder can be weighed at any time (the weight of the feeding device itself is subtracted from the total weight weighed to obtain the weight of the powder added at the right time). There may be a transition pipe at the bottom of the entire discharge funnel, and the other end of the transition pipe may be a soft connection structure. The soft connection structure is composed of a joint and a soft connection pipe. The soft connection pipe is also called a soft connection pipe, a flexible connection pipe, such as a bellows and a rubber pipe. The soft connection structure is used to connect the transition pipe and the downstream powder processing equipment. It can compensate for the displacement and stress caused by the vibration of the equipment and pipelines, and reduce their interference with the weighing accuracy of the feeder. By weighing the feeder, the precise weight of the powder entering the downstream powder processing equipment can be monitored in real time, and the soft connection plays the role of conveying the powder.

[0052] The above unmarked parts, structures or quantities are not shown in the figures; some parts are not marked. The drawings are only for reference. If there is any inconsistency between the drawings and the text description or between the drawings, the text description shall prevail.

[0053] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A powder quantitative feeding device, comprising a feed hopper and a distribution plate, wherein the distribution plate is arranged at the discharge port of the feed hopper, and the distribution plate has a plurality of discharge holes; and further comprising at least two scrapers connected to a scraper drive mechanism via a scraper shaft and driven to rotate by the scraper drive mechanism, characterized in that: The outer end surface of each scraper is matched with the inner wall of the circular discharge port in a clearance; the bottom surface of each scraper is attached to the top surface of the material distribution plate and can rotate relatively.

2. A powder quantitative feeding device according to claim 1, characterized in that: The plurality of scrapers are symmetrically arranged on a short sleeve scraper seat along the scraper axis. The short sleeve scraper seat is circumferentially limited and axially movable on the scraper shaft. An elastic device for elastically compressing the scraper is provided between the top of the short sleeve scraper seat and the scraper shaft.

3. A powder quantitative feeding device according to claim 1 or 2, characterized in that: The top view shape of each scraper is a rectangle, and the rear bottom surface in the direction of rotation of the scraper is a horizontal plane that fits the top surface of the distribution plate; the front bottom surface in the direction of rotation of the scraper forms an angle of 5°-10° with the horizontal plane to form a gap, which is wide outside and narrow inside; the front side surface in the direction of rotation of the scraper is a front inclined plane that is 30°-60° with the horizontal plane, and the front inclined plane is low inside and high outside.

4. A powder quantitative feeding device according to claim 3, characterized in that: Each material discharge hole is an inclined hole, and the inclination direction of the hole is: when the scraper rotates, the vertical projection of the front straight edge is first tangent to the top end of the inclined hole and then tangent to the bottom end of the inclined hole.

5. A powder quantitative feeding device according to claim 2, characterized in that: The feed hopper is a feed funnel, and a funnel cover is provided on the top of the feed funnel, and a feed pipe is provided on the funnel cover. The scraper drive mechanism is fixed on the funnel cover, and the output shaft of the scraper drive mechanism is drivingly connected with the scraper shaft. The scraper shaft is coaxial with the circular feed funnel and the circular discharge port. The scraper shaft is also fixed with a first stirring frame whose edge matches the clearance of the inner wall of the circular feed funnel and is used to scrape the powder on the inner wall of the feed funnel. The bottom end of the scraper shaft rotates and fits in the center hole of the distribution plate.

6. A powder quantitative feeding device according to claim 5, characterized in that: The first stirring frame is fixed on the scraper shaft through a long sleeve; the short sleeve scraper seat is also movably sleeved in the bottom end of the long sleeve, and a compression spring is provided between the top end of the short sleeve scraper seat and the step surface at the lower end of the long sleeve.

7. A powder quantitative feeding device according to claim 1, characterized in that: The material distribution plate is circular, and the multiple material discharge holes are arranged in multiple rows along the circumference, the distances between rows are equal, the distances between adjacent material discharge holes in each row are equal, and the outer circle edges of the multiple rows of material discharge holes are equal to the inner diameter of the circular discharge port.

8. The powder quantitative feeding device according to claim 7, characterized in that: The angle between the center line of each row of feeding holes and the diameter line of the feeding plate is 5°-15°.

9. A powder quantitative feeding device according to claim 1, characterized in that: A pair of circular flanges are arranged at the material discharging port, and a groove for accommodating and fixing the material distributing plate is arranged on the inner circle of the inner end surface of one of the circular flanges.

10. A powder quantitative feeding device according to claim 9, characterized in that: A discharge funnel is fixed on the lower flange of a pair of flanges, and a stirring shaft fixed coaxially with the scraper shaft is arranged in the discharge funnel. The stirring shaft is fixed with a second stirring frame having an edge that matches the inner wall gap of the circular discharge funnel and is used for scraping powder on the inner wall of the discharge funnel.

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