Feeding device for clay stabilizer production

Abstract

The utility model relates to a feeding device for clay stabilizer production. The feeding device comprises a screen, a quantifying part A and a quantifying part B, the screen is connected with the abutting rod, the upper end of the abutting rod makes contact with a cam, the cam is driven by a motor A, the large-diameter end of the cam makes contact with the abutting rod to make the abutting rod move downwards, the small-diameter end of the cam makes the abutting rod move upwards, the screen is arranged above the quantifying part A through a spring and inclines by a certain angle, and the quantifying part B is arranged on one side of the lower slope face of the screen. Raw material powder is poured into a screen, a motor A enables a cam to rotate, so that a contact abutting rod moves up and down, when the abutting rod moves downwards, the connected screen is driven to press downwards, a spring is stressed and compressed, when the abutting rod moves upwards, the spring returns, the screen is driven to vibrate, and powder small in particle size falls into a quantitative part A through screen holes; and the powder with large particle size rolls into the quantitative part B towards the downslope surface through the screen. The stirring device has the beneficial effects that the structure is simple, the stirring efficiency can be improved, and orderly and quantitative conveying can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a feeding device technical field, especially a kind of feeding device for clay stabilizer production. BACKGROUND

[0002] Clay stabilizer is a kind of additive that can prevent soil swelling, resist acid and alkali erosion and improve the state of concrete and improve the stability of soil, its essence is to improve the mechanical properties of soil;Clay stabilizer can be widely used in highway, railway and building dam engineering construction, is an important chemical additive.

[0003] In the production of industrial clay stabilizer, ammonium chloride raw material in powder form needs to be mixed with water in a certain proportion and stirred uniformly, some feeding devices for clay stabilizer designed in the prior art include: a feeding bucket and stirring blades;The feeding bucket is provided with a feeding port, and the raw materials are added into the bucket through the feeding port by pipeline, and the stirring blades are rotatably arranged in the feeding bucket to stir the raw materials and water;Since the amount of powder raw materials and water required in the production process is large, and the particle size of the powder in the raw materials is not uniform, there are a lot of large particle size powders, and the large particle size powders are only stirred by the same low speed stirring shaft after entering the water, which is easy to stir unevenly, even causes agglomeration, the quality of the product is unstable, and it is difficult to guarantee, and when a large amount of raw material powder is poured into the bucket through the pipeline, it is easy to cause blockage at the outlet, which is not convenient for the production process.

[0004] Therefore, based on the deficiencies of the existing device according to customer feedback, the inventor has made further improvements to overcome the above problems according to the proposed defects and deficiencies. INVENTION CONTENTS

[0005] The utility model aims at overcoming the shortcomings of the prior art, and provides a feeding device for clay stabilizer production, which can be stirred according to particle size to improve work efficiency, can be orderly and quantitatively conveyed, and can avoid blockage.

[0006] The utility model discloses a kind of feeding device for clay stabilizer production, which is realized by the following technical solutions:

[0007] The screen and the stopper are connected, the upper end of the stopper is in contact with a cam, and the cam is driven to rotate by motor A, the large diameter end of the cam contacts the stopper to make the stopper move downward, and the small diameter end of the cam makes the stopper move upward again, the screen is arranged above the quantitative part A by spring, and the screen is arranged at a certain angle, and the quantitative part B is arranged on the downhill side of the screen, and the upper opening of the quantitative part B is in close contact with the downhill edge of the screen;

[0008] The raw material powder is poured onto the screen, the motor A is started to rotate the cam, so that the abutting rod in contact moves up and down, the abutting rod moves down to drive the connected screen to press down, the spring is compressed under force, and when the abutting rod moves up, the spring returns to its original position, thereby driving the screen to vibrate, the powder with small particle size on the screen falls through the screen hole into the quantitative part A, and the powder with large particle size rolls into the quantitative part B through the vibration of the inclined screen.

[0009] As a preferred technical solution of the present application, the top frame is hollow inside, and the top frame has the quantitative part A and the upper side screen and the upper part of the quantitative part B sleeved inside it, the top surface of the top frame is provided with a feeding port, and the feeding port is arranged on the uphill side of the screen.

[0010] As a preferred technical solution of the present application, the inner wall of the top cover of the top frame is fixedly provided with a motor A, the transmission shaft of the motor A is connected with a cam, the cam includes a large-diameter end and a small-diameter end, and the cam rotates with the transmission shaft, and the end faces of the large-diameter end and the small-diameter end of the cam are always in contact with the abutting rod; the abutting rod includes a top surface and a long rod, the top surface is in contact with the cam, and the lower surface of the top surface is connected with a plurality of long rods perpendicularly, and the bottom ends of the long rods are connected with the upper surface of the screen.

[0011] As a preferred technical solution of the present application, the top surface of the abutting rod is provided with a guide hole, and the inner wall of the top cover is perpendicularly connected with a guide column, the abutting rod is inserted into the guide column through the guide hole, and when the cam drives the abutting rod to move up and down, the top surface moves up and down along the guide column; the guide column limits the abutting rod to move up and down only.

[0012] As a preferred technical solution of the present application, the spring includes a spring A and a spring B, the spring A is arranged on the uphill side of the screen, and the spring B is arranged on the downhill side of the screen, one end of the spring A and the spring B is connected with the lower surface of the screen, and the other end is connected with an inclined frame.

[0013] As a preferred technical solution of the present application, the quantitative part A and the quantitative part B both include rotating cylinders; the two rotating cylinders are rotating cylinder A and rotating cylinder B respectively; and a partition plate is arranged in the rotating cylinder, a plurality of partition leaves of the partition plate divide the rotating cylinder into a plurality of areas, the center shaft of the partition plate extends out of the end to penetrate the side surface of the rotating cylinder, and the end is connected with the motor B, the motor B drives the partition plate to rotate in the rotating cylinder, and the amount of powder conveyed downward can be controlled by controlling the rotating speed of the partition plate.

[0014] As a preferred technical solution of the present application, the lower part of the two rotating cylinders is respectively connected with stirring frame A and stirring frame B, a plurality of stirring shafts are arranged in the two stirring frames, and clean water is arranged in the frame, the small-particle-size powder screened and conveyed through the screen falls into the stirring frame A for small-rate stirring through the stirring shaft, and the large-particle-size powder falls into the stirring frame B for large-rate stirring through the stirring shaft.

[0015] This utility model has the following advantages:

[0016] (1) It can control the powder delivery in an orderly manner and avoid blockage during feeding;

[0017] Current powder feeding devices lack effective anti-clogging components, and the feeding pipes are typically short and narrow, making them prone to clogging when large amounts of powder pass through, resulting in low work efficiency. This solution is equipped with a metering section that delivers powder in portions via a rotating cylinder. After the powder falls into the rotating cylinder, it is portioned by rotating partitions. When the area between each pair of adjacent fan blades aligns with the downward discharge, the powder is conveyed to the mixing frame, enabling the powder to be delivered in portions and in an orderly manner, effectively avoiding clogging.

[0018] (2) Separate the powder according to its particle size and mix it with water to avoid uneven mixing or clumping;

[0019] This design utilizes a rotatable cam, a push rod, and a spring-supported screen in coordination. The cam has large and small diameter ends; its rotation causes the push rod to move vertically. When the push rod moves downwards, the screen is pressed down, causing the spring to contract. When the cam rotates to its small diameter end opposite the push rod, the spring stops pressing down and returns to its original position, causing the screen to move upwards, completing one vibration. Furthermore, the tilted screen design separates the powder according to its diameter, resulting in a very simple structure that effectively and quickly sieves the raw materials and agitates them using stirring shafts at different speeds, preventing uneven mixing. Attached Figure Description

[0020] Figure 1 This is a first-view structural schematic diagram of the present invention;

[0021] Figure 2 This is a structural schematic diagram of the present invention from the frontal view after the top frame has been removed;

[0022] Figure 3 This is a schematic diagram of the structure of the screen and the quantitative part A after installation, from a first-view perspective.

[0023] Figure 4 This is a schematic diagram of the structure of the screen and the quantitative part A after installation from a first side view.

[0024] Figure 5 This is a schematic diagram of the structure of the screen vibration mechanism of this utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the screen vibration mechanism and the top frame after installation of this utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the rotating cylinder and stirring frame after assembly.

[0027] Figure 8 It is a structure schematic view of the stirring shaft of the utility model;

[0028] In the figure: 1 - screen, 2 - spring A, 3 - spring B, 4 - cam, 5 - motor A, 6 - top frame, 7 - feed inlet, 8 - top surface, 9 - long rod, 10 - guide column, 11 - upper open frame A, 12 - rotating cylinder A, 13 - upper open frame B, 14 - rotating cylinder B, 15 - partition plate, 16 - stirring frame A, 17 - stirring frame B, 18 - stirring shaft. DETAILED DESCRIPTION

[0029] The utility model will be further described below in combination with the drawings, but the protection scope of the utility model is not limited to the following.

[0030] It should be noted that the orientation or position relationship indicated by "left", "right" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship commonly used when the product of the invention is used, or is the orientation or position relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0031] It should be noted that the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0032] Therefore, based on the above problems, referring to Figure 1 The utility model provides a feeding device for clay stabilizer production to solve the problem.

[0033] (Example 1)

[0034] Referring to Figures 1-8 The feeding device for clay stabilizer production provided in the embodiment comprises a screen 1, a stopper and a quantitative part A and a quantitative part B.

[0035] Among them, referring to Figures 1-5 The screen 1 is arranged on the upper surface of the quantitative part A through a spring, and the screen 1 is arranged in an inclined downward manner, the upper surface of the screen 1 is fixedly connected with a stopper, the upper surface of the stopper is in contact with a rotatable cam 4 (driven to rotate through a motor A 5), the cam 4 comprises a large-diameter end and a small-diameter end, when the cam 4 rotates to contact the upper surface of the stopper at the large-diameter end, the stopper acts downward, when the cam 4 contacts the upper surface of the stopper at the small-diameter end, the stopper acts upward under the restoring force of the spring;

[0036] Among them, referring to Figure 5The upper part of the quantitative part A comprises a slope frame, which is open at the top and bottom, and the upper surface of the left side is higher than the right side, so that the screen 1 can be set on the quantitative part A by the spring and inclined to the right, and the slope frame is connected with the rotating cylinder and the stirring frame A16 at the bottom;

[0037] As shown in Figure 2 The quantitative part B is set on the side of the lower slope of the screen 1, and the upper part of the quantitative part B is open and the frame edge is close to the lower slope edge of the screen 1, and the quantitative part B is also connected with the rotating cylinder and the stirring frame B17 at the bottom;

[0038] When the raw material powder is poured on the screen 1, the small diameter end of the cam 4 is in contact with the upper surface of the stopper in the initial state, and the driving motor A5 drives the cam 4 to rotate, and the large diameter end of the cam 4 is in contact with the upper surface of the stopper, and the stopper is driven downward, so that the screen 1 fixed with the stopper moves downward, and the spring connected below the screen 1 is pressed downward, and when the cam 4 rotates again and the small diameter end is opposite to the upper surface of the stopper, the spring loses the pressure and returns to the original state, so that the screen 1 moves upward, and the screen 1 vibrates, and the small particle size powder on the screen 1 falls into the quantitative part A through the screen hole, and the large particle size powder rolls into the quantitative part B through the inclined screen 1.

[0039] Some powder feeding devices at present, due to a large amount of powder raw materials and clean water required in the industrial production process, and the particle size of the powder in the raw materials is not uniform, there are a lot of large particle size powder, and compared with the small particle size powder, the large particle size powder is only stirred by the same low speed stirring shaft 18 after entering the clean water, which is easy to stir unevenly, even causes agglomeration, and the quality of the product is unstable, which is difficult to guarantee, so the present scheme designs a feeding device, which can first screen the powder according to the particle size, the fine particle powder enters the stirring frame A16 to be stirred by the low speed stirring shaft 18, and the coarse particle powder enters the stirring frame B17 to be stirred by the high speed stirring shaft 18, so that the powder and clean water can be uniformly mixed and stirred, and the screening mechanism used is composed of the screen 1 connected with the spring, the stopper and the cam 4, the rotation of the cam 4 drives the stopper to move in the up-down direction, so that the screen 1 vibrates, and the screen 1 is set to be inclined downward, the small particles pass through the screen hole, and the large particles roll into the quantitative part B along the inclined surface.

[0040] In this embodiment, as shown in Figure 1 and Figure 6It also includes a top frame 6, which is a long rectangular frame, the inside is hollow and the quantitative part A and the upper part of the screen 1 and the quantitative part B are all set in the top frame 6, only a feeding port 7 is set on the top surface of the top frame 6, which is used for pouring raw powder, and the feeding port 7 is set at the left side of the screen 1; meanwhile, a motor A5 is fixedly connected on the inner surface of the top cover of the top pipe, the motor A5 extends a transmission shaft connected with a cam 4 and the end of the transmission shaft is connected with the back surface of the cam 4, the cam 4 rotates with the transmission shaft, and the end surface of the large diameter end of the cam 4 is always in contact with the abutting rod.

[0041] It should be noted that, in addition to the feeding port 7 set on the top of the top frame 6, the left and right sides and the lower surface are all in a closed state, which avoids affecting the production process caused by the flying of the powder during the screening of the powder.

[0042] In the embodiment, referring to Figures 3-5 For the abutting rod, the abutting rod includes a top surface 8 and a long rod 9, the top surface 8 is a T-shaped plate, three long rods 9 are fixedly connected on the lower surface of the T-shaped plate at equal intervals and are perpendicular to the T-shaped plate, a guide hole is opened on the protruding end of the T-shaped plate, and a guide column 10 is vertically connected on the inner wall of the top of the top frame 6 at a position opposite to the guide hole, the guide column 10 penetrates the guide hole of the top surface 8, that is, the abutting rod is inserted with the guide column 10 through the guide hole, when the driving motor A5 drives the cam 4 to rotate and drive the abutting rod to act, the top surface 8 of the abutting rod moves up and down along the guide column 10, and the guide column 10 can limit the abutting rod to a certain extent, so that the abutting rod can only act in the up-down direction.

[0043] Further, the lengths of the three long rods 9 are consistent, and the bottom ends of the three long rods 9 are fixedly connected with the upper surface of the screen 1, so that the screen 1 is more stable during vibration, and the screening process is orderly.

[0044] In the embodiment, referring to Figure 3 and Figure 5 For the screen 1, the screen 1 is a rectangular screen 1, a plurality of screen holes are opened on the screen 1, the screen holes are only used for small particle powders to pass through, and the screen 1 is arranged to be inclined by springs; the springs include a spring A2 and a spring B3, the spring A2 is arranged on the uphill side of the screen 1 and the spring B3 is arranged on the downhill side of the screen 1, one end of the spring A2 and the spring B3 is connected with the lower surface of the screen 1, and the other end is connected with an inclined frame, when the abutting rod acts downward, the screen 1 is pressed downward, so that the spring A2 and the spring B3 are compressed under stress, and when the small diameter end of the cam 4 is in contact with the abutting rod, the stress is removed, so that the spring returns to the original position and drives the screen 1 to move upward, that is, the vibration process of the screen 1.

[0045] In the embodiment, referring to Figure 7For the quantitative part A; the quantitative part A includes the upper open frame A11 and the rotating cylinder A12; the upper open frame A11 is a tapered frame, which facilitates the smooth sliding of the powder to the inside of the rotating cylinder A12, the upper surface of the upper open frame A11 is connected with the lower surface of the inclined frame and penetrates through, the rotating cylinder A12 is fixedly connected with the upper open frame A11, a rotating partition plate 15 is arranged in the rotating cylinder A12, the partition plate 15 includes four partition leaves, which separate the inside of the rotating cylinder A12 into four areas, the center shaft of the partition plate 15 penetrates through the side surface of the rotating cylinder A12 and the extending end is connected with a motor B, the motor B drives the partition plate 15 to rotate in the rotating cylinder A12, the falling powder is divided in the four areas and is transported by the rotation of the partition plate 15; when the partition plate 15 rotates, each area can receive the small particle size powder falling from the screen 1; when the partition plate 15 rotates, the notch of one area faces downward, the powder falls into the stirring frame A16, and the falling powder can be controlled by controlling the rotating speed of the partition piece.

[0046] In this embodiment, referring to Figure 7 For the quantitative part B; the quantitative part B includes the upper open frame B13 and the rotating cylinder B14; the upper open frame B13 is also a tapered frame and its upper surface is connected with the lower slope side edge of the screen 1, the large particle size powder falls into the rotating cylinder B14 through the upper open frame B13, the rotating cylinder B14 has the same structure as the rotating cylinder A12, and a partition plate 15 driven by the motor B rotates in the rotating cylinder B14 to quantitatively transport the powder, and the lower side of the rotating cylinder B14 is fixedly connected with the stirring frame B17.

[0047] Further, referring to Figure 7 and Figure 8 The stirring frame A16 and the stirring frame B17 are each provided with two stirring shafts 18, the stirring shafts 18 are driven by a stirring motor, the stirring motor is arranged on the bottom surface of the stirring frame A16 and the stirring frame B17, clean water is arranged in the stirring frame A16 and the stirring frame B17, the small particle size powder screened and transported through the screen 1 falls into the stirring frame A16 and is stirred at a low speed by the stirring shaft 18, and the large particle size powder falls into the stirring frame B17 and is stirred at a higher speed by the stirring shaft 18, so that the powder of different particle sizes can be mixed and stirred with the clean water.

[0048] Working process: the raw material powder is poured into the device through the feeding port 7 on the top frame 6, the powder falls on the screen 1, and the driving motor A5 is rotated to rotate the cam 4, the large diameter end of the cam 4 abuts against the top surface 8 of the abutting rod, and the abutting rod is abutted downward, the abutting rod transmits force to the screen 1, the screen 1 is pressed downward, so that the spring A2 and the spring B3 are pressed downward, when the cam 4 rotates to the small diameter end and the top surface 8 of the abutting rod, the pressure disappears, that is, the spring returns to the original state, the screen 1 moves upward, so that the screen 1 vibrates, the small particle size powder falls into the upper opening frame A11 through the screen hole, and the large particle size powder falls into the upper opening frame B13 arranged beside through the inclined screen 1, the large and small particle size powders are respectively transferred into the stirring frame A16 and the stirring frame B17 through the rotating cylinder, the stirring shaft 18 in the two frames is started to stir the powders with different particle sizes in the poured clean water at different speeds.

[0049] At present, a large amount of powder raw materials and clean water are mixed in the production process of the clay stabilizer for industry, the particle sizes of the powder in the raw materials are different, and there are many large particle size powders, if the large particle size powder is stirred by the stirring shaft 18 at the same low speed as the small particle size powder after entering the clean water, the large particle size powder is easy to be stirred unevenly, and even causes the raw materials to be agglomerated, so that the quality of the product is difficult to guarantee, and the existing feeding device does not arrange a suitable quantitative material distribution mechanism, when a large amount of raw material powder is poured into the stirring barrel through the pipeline, blockage is easy to occur; the feeding device designed in the scheme solves the existing problems through the arrangement of the quantitative mechanism and the screening, the screen 1 supported by the spring is matched with the rotatable cam 4 and the abutting rod, because the cam 4 has the large and small diameter ends, the spring can be contracted and elongated through the abutting rod under the pressure, so that the screen 1 is vibrated, and because the screen 1 is arranged to be inclined, the powder can be separated according to the particle size, the structure is simple, the design is ingenious and reasonable, the powder can be automatically screened and respectively sent into the stirring frame with the stirring shaft 18 of different specifications and speeds for stirring; at the same time, the rotating cylinder is arranged, the partition plate 15 controlled by the motor B is rotated in the rotating cylinder, the powder can be automatically quantitatively transported, labor is saved, the working efficiency is high, and blockage is effectively avoided; the overall structure is simple and compact, safe and environmentally friendly, and low in cost; and the feeding device is very suitable for use in the production and processing process of the clay stabilizer.

[0050] Finally, it should be noted that: the above only describes the preferred embodiments of the utility model, and is not used to limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, the technical scheme recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A feeding device for producing a clay stabilizer, characterized by: It comprises a screen (1), a resistance rod, a quantitative part A and a quantitative part B. The screen (1) is connected with the resistance rod, the upper end of the resistance rod is in contact with a cam (4) and the cam (4) is driven to rotate by a motor A (5), the large diameter end of the cam (4) contacts the resistance rod to make the resistance rod move downward, and the small diameter end of the cam (4) makes the resistance rod move upward again, the screen (1) is arranged above the quantitative part A by a spring and is arranged at an angle, and the quantitative part B is arranged on the side of the downhill surface of the screen (1), the upper end opening of the quantitative part B is close to the downhill edge of the screen (1). The raw material powder is poured onto the screen (1), the motor A (5) is started to make the cam (4) rotate, so that the resistance rod in contact moves up and down, the resistance rod drives the screen (1) connected thereto to move downward when the resistance rod moves downward, and the spring is compressed under force, and the spring returns to position when the resistance rod moves upward, thereby driving the screen (1) to vibrate, the powder with small particle size on the screen (1) falls through the screen hole into the quantitative part A, and the powder with large particle size rolls into the quantitative part B through the vibration of the inclined screen (1) toward the downhill surface.

2. The feeding device for producing a clay stabilizer according to claim 1, characterized in that: It also comprises a top frame (6), the inside of the top frame (6) is hollow, the top frame (6) sleeves the quantitative part A and the upper screen (1) and the upper part of the quantitative part B inside, the upper surface of the top frame (6) is provided with an inlet (7) and the inlet (7) is arranged on the uphill side of the screen (1).

3. A feeding device for producing a clay stabilizer according to claim 2, characterized in that: The inner wall of the top cover of the top frame (6) is fixedly provided with a motor A (5), the transmission shaft of the motor A (5) is connected with a cam (4), the cam (4) comprises a large diameter end and a small diameter end and rotates with the transmission shaft, the end faces of the large and small diameter ends of the cam (4) are always in contact with the resistance rod; the resistance rod comprises a top surface (8) and a long rod (9), the top surface (8) is in contact with the cam (4) and the lower surface of the top surface (8) is perpendicularly connected with a plurality of long rods (9), the bottom ends of the long rods (9) are connected with the upper surface of the screen (1).

4. The feeding device for producing a clay stabilizer according to claim 3, characterized in that: The top surface (8) of the resistance rod is provided with a guide hole, a guide column (10) is perpendicularly connected with the inner wall of the top frame (6), the resistance rod is inserted with the guide column (10) through the guide hole, and the top surface (8) moves up and down along the guide column (10) when the cam (4) drives the resistance rod to move up and down; the guide column (10) limits the resistance rod to move only in the up-down direction.

5. The feeding device for producing a clay stabilizer according to claim 1, characterized in that: The spring comprises a spring A (2) and a spring B (3), the spring A (2) is arranged on the uphill side of the screen (1) and the spring B (3) is arranged on the downhill side of the screen (1), one end of the spring A (2) and the spring B (3) is connected with the lower surface of the screen (1) and the other end is connected with an inclined frame.

6. A feeding device for producing a clay stabilizer according to claim 1, characterized in that: The quantitative part A and the quantitative part B both comprise rotating cylinders; the two rotating cylinders are rotating cylinder A (12) and rotating cylinder B (14) respectively; and a partition plate (15) is arranged in the rotating cylinder, a plurality of partition leaves of the partition plate (15) divide the rotating cylinder into a plurality of areas, the center shaft of the partition plate (15) extends out of the end and penetrates the side surface of the rotating cylinder, and the end is connected with a motor B, the motor B drives the partition plate (15) to rotate in the rotating cylinder, and the amount of powder delivered downward can be controlled by controlling the rotating speed of the partition plate (15).

7. A feeding device for the production of clay stabilizers according to claim 6, characterized in that: The lower part of each of the two rotating cylinders is connected to a stirring frame A (16) and a stirring frame B (17), each of which is provided with a plurality of stirring shafts (18) and contains clean water. The small-particle-size powder separated and transported through the screen (1) falls into the stirring frame A (16) and is stirred at a low speed by the stirring shafts (18), while the large-particle-size powder falls into the stirring frame B (17) and is stirred at a high speed by the stirring shafts (18).

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