CN111278567A

CN111278567A - Powder processing device

Info

Publication number: CN111278567A
Application number: CN201880069175.4A
Authority: CN
Inventors: 猪木雅裕
Original assignee: Hosokawa Micron Corp
Current assignee: Hosokawa Micron Corp
Priority date: 2017-10-27
Filing date: 2018-10-24
Publication date: 2020-06-12
Anticipated expiration: 2038-10-24
Also published as: EP3702040A1; WO2019082931A1; JP2019076874A; KR20200068671A; KR102559996B1; EP3702040A4; CN111278567B; JP6982467B2

Abstract

In order to achieve a reduction in the flow rate of the gas flow and a reduction in the size of the powder based granules with a simple configuration, the powder processing apparatus further includes a cylindrical housing, a raw material supply unit, a first rotating body that rotates about a central axis, a pulverizing member that pulverizes the raw material into powder based granules, a second rotating body that rotates about the central axis, a plurality of blades arranged radially at one of end portions of the second rotating body in a vertical direction, a gas flow inlet unit that is arranged below the rotating body and that allows the gas flow to flow into the housing, a gas flow outlet unit that discharges the gas flow containing the powder based granules from an upper portion of the housing, and a guide surface that faces the second rotating body in a radial direction and that positions a front side and a rear side of the second rotating body in the rotational direction radially inward of the second rotating body.

Description

Powder processing device

Technical Field

The present invention relates to a powder processing apparatus for pulverizing a lump material to produce a powder having a predetermined particle diameter.

Background

A conventional micro-pulverization device is disclosed in Japanese patent laid-open No. 2001-259451. The fine grinding device is provided with: a pulverization rotor rotatably provided inside the pulverization chamber; a liner disposed so as to be spaced apart from an outer peripheral portion of the pulverizing rotor by a gap; a classifying rotor for discharging a raw material having a predetermined particle size or less to the outside; a circulation path for guiding the raw material not discharged by the classifying rotor downward; and fins projecting inward from the inner surface of the pulverizing chamber to collide the raw material, thereby preventing the raw material that is not discharged by the classifying rotor from swirling along the inner surface of the pulverizing chamber.

In this micro grinding apparatus, the charged raw material is ground by the grinding rotor and the lining. The pulverized material is moved upward by the airflow introduced into the inside, and is applied with a centrifugal force by the classifying rotor. The raw material having a smaller particle size than a predetermined particle size in which the force toward the inside generated by the gas flow is larger than the centrifugal force is discharged to the outside. The raw material that is not discharged to the outside, that is, the raw material having a particle size larger than a predetermined particle size, flows in the circumferential direction along the pulverization chamber, but collides with the vanes and falls down, and is pulverized again by the pulverization rotor and the liner. In this way, by providing the fins, a large amount of raw material does not fall onto the pulverizing rotor at one stroke, and pulsation of the pulverizing rotor can be prevented, so that the pulverizing rotor can be stably driven.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open No. 2001-259451

Disclosure of Invention

Problems to be solved by the invention

However, in the micro-pulverization device disclosed in japanese patent application laid-open No. 2001-259451, the airflow generated by the classifying rotor also collides with the fins. The air flow colliding with the fins flows in the vertical direction. At this time, the downward air flow collides with the air flow flowing toward the classifying rotor from the gap between the pulverizing rotor and the liner, and therefore the flow velocity, i.e., the energy, of the air flow flowing toward the classifying rotor is reduced. Therefore, in the micro-pulverization device disclosed in japanese patent application laid-open No. 2001-259451, even if the airflow colliding with the fins is blown out, it is necessary to set the flow rate of the airflow flowing toward the classifying rotor to a flow rate that can flow upward. The particle size of the powder or granule to be classified by the classifying rotor is inversely proportional to the rotational speed of the classifying rotor and proportional to the square root of the flow rate of the airflow flowing through the classifying rotor. In the fine pulverization device disclosed in jp 2001-259451 a, it is difficult to reduce the flow rate of the air flowing through the classifying rotor, and therefore it is difficult to reduce the particle size of the classified particles to a fixed particle size or less.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a powder processing apparatus having a simple structure and capable of reducing the flow rate of an air flow and making the powder and granular material fine.

Means for solving the problems

In order to achieve the above object, a powder processing apparatus according to the present invention includes: a frame body which is cylindrical and extends in the vertical direction; a raw material supply unit that supplies a raw material into the housing; a first rotating body which is disposed below the raw material supply unit and rotates around a central axis extending in a vertical direction; a pulverization member that is disposed at a radially outer edge portion of the first rotating body and pulverizes the raw material into powder and granular substances; a swirling airflow generating unit that is disposed above the first rotating body in the housing and generates an airflow in a swirling direction in the housing; an airflow inflow portion that is disposed below the rotating body of the housing and that allows an airflow to flow into the housing; and an airflow outflow portion that causes the airflow to flow out from an upper portion of the housing, wherein a guide portion having a guide surface that faces the swirling airflow generation portion in a radial direction and that causes a front side and a rear side of the swirling airflow generation portion in a rotation direction to be positioned radially inward is provided inside the housing.

According to this configuration, the powder or granule swirling inside the housing is forced radially inward by the guide surface. Therefore, even if the flow rate of the airflow flowing in from the airflow inflow portion is reduced, a force pushing the powder or granule radially inward can be applied. This can reduce the flow rate of the airflow flowing in from the airflow inflow portion. Further, since the flow rate of the airflow can be reduced, the particle diameter of the powder or granule discharged from the airflow outlet portion can be reduced, that is, the particle diameter can be made finer. Further, by reducing the flow rate of the air flow, the size of the device generating the air flow can be reduced, and the size of the entire device can be reduced. Further, by suppressing the flow rate of the air flow to a small amount, power consumption can be suppressed, and power saving can be achieved.

In the above configuration, the swirling-flow generating portion may include a second rotating body that rotates around a central axis, and a plurality of blades that are provided upright radially on a peripheral portion of the second rotating body. By configuring in this manner, classification of the powder and granular material can be performed with a simple configuration.

In the above configuration, a surface of the guide surface, which is extended in the circumferential direction from an end portion of the swirl flow generation portion on the front side in the rotational direction, is located radially outward of the swirl flow generation portion. By configuring in this manner, the centrifugal force applied to the powder/granular material from the swirling-air-flow generating portion is less likely to be hindered by the air flow guided by the guide surface. Further, the powder or granule can be prevented from colliding with the swirling-air-flow generating portion.

In the above configuration, the frame body includes a cylindrical housing tube portion extending along the central axis, and at least one of the guide portions extends radially inward from the housing tube portion. By configuring in this manner, the guide portion can be firmly fixed.

In the above configuration, the housing includes a housing top plate portion extending in a direction orthogonal to the central axis at a vertical upper end portion, and at least one of the guide portions extends downward from a lower surface of the housing top plate portion. By configuring in this manner, the guide portion can be firmly fixed. Further, since the guide portion can be taken out together with the case top plate portion, maintenance is easy.

In the above configuration, the guide portion has a plate shape.

In the above configuration, the guide surface is a curved surface in which a circumferential intermediate portion bulges in a radial direction.

In the above configuration, an upper side of the guide surface is located on a front side in a rotational direction of the swirling airflow generating portion with respect to a lower side.

Effects of the invention

According to the present invention, it is possible to provide a powder processing apparatus having a simple configuration and capable of reducing the flow rate of an air flow and making a powder and granular material fine.

Drawings

Fig. 1 is a sectional view of a powder processing apparatus according to the present invention.

Fig. 2 is a plan view of the crushing section.

FIG. 3 is a sectional view of the pulverization section shown in FIG. 2 taken along the line III-III.

Fig. 4 is a plan view of the swirling airflow generating portion and the guide portion.

Fig. 5 is a sectional view showing another installation manner of the guide plate.

Fig. 6 is a plan view showing another example of the guide section used in the powder processing apparatus according to the present invention.

Fig. 7 is a plan view showing still another example of the guide portion.

Fig. 8 is a schematic configuration diagram of an example of the powder processing system according to the present invention.

Fig. 9 is a sectional view of a conventional powder treatment apparatus used in a test of a comparative example.

Fig. 10 is a graph showing the results of test 1.

Fig. 11 is a graph showing the results of test 2.

Fig. 12 is a graph showing the time until the pulverizing section returns to the idle state after the supply of the raw material is stopped.

Fig. 13 is a graph showing the pulverization efficiency.

Fig. 14 is a graph showing the content of the fine powder contained in the produced powder granules.

Fig. 15 is a graph showing the pulverization efficiency.

Detailed Description

A powder processing apparatus according to the present invention will be described with reference to the drawings.

<1. Structure of powder treating apparatus >

Fig. 1 is a sectional view of a powder processing apparatus according to the present invention. The powder processing apparatus a crushes the lump materials into powder particles. As shown in fig. 1, the powder processing apparatus a includes a housing 10, a raw material supply unit 20, a drive unit 30, a pulverization unit 40, a swirling airflow generation unit 50, a guide unit 60, and an airflow outflow unit 70. The direction in which the central axis C1 extends is referred to as the vertical direction. A direction perpendicular to the vertical direction is a radial direction, a side toward the center is an inner side, and a side away from the center is an outer side. A direction along a circumference around the central axis C1 is defined as a circumferential direction.

<1.1 construction of housing 10 >

The housing 10 includes a case 11, a shaft holding portion 12, a material receiving hole 13, an airflow inlet portion 14, a bottom cover 15, and a hinge 16. The housing 11 is cylindrical and extends along a central axis C1 extending vertically.

<1.1.1 Structure of case 11 >

As shown in fig. 1, the housing 11 includes a housing bottom portion 111, a housing tube portion 112, a flange portion 113, and a housing top plate portion 114. The case bottom 111 has a disk shape extending radially outward from the center. The housing 11 is fixed to a base or the like, not shown, so that the housing bottom 111 is horizontal. The case tube portion 112 is a tube shape extending upward from the outer edge of the case bottom portion 111 along the center axis C1. The housing tube portion 112 is cylindrical and centered on the central axis C1.

The flange portion 113 is disposed at the upper end of the housing tube portion 112 and radially outwardly expands. The flange portion 113 and the housing tube portion 112 are integrally formed. That is, the housing bottom 111, the housing tube 112, and the flange 113 are integrally formed of metal. Examples of the metal include, but are not limited to, stainless steel.

As shown in fig. 1, the lower end of the housing tube 112 is closed by the housing bottom 111. Further, the upper end portion of the housing tube portion 112 is in an open state. The housing top plate portion 114 closes the opening at the upper end of the housing tube portion 112. The case top plate 114 is attached to the flange 113 via the hinge 16. Thereby, the case top plate 114 rotates about the rotation shaft 161 of the hinge 16, and opens and closes the opening of the case tube 112.

In a state where the opening of the housing tube 112 is closed, the housing top plate 114 is fixed to the flange 113 by a screw or the like. Thus, the housing tube 112 and the housing top plate 114 are securely fixed and sealed so that the air flow does not leak from the gap. Although the fixation by a screw or the like may be performed at one location, it is preferable to perform fixation at a plurality of locations in order to reliably perform fixation and sealing. Furthermore, gaskets, padding, etc. may also be provided to promote air tightness.

A through hole 115 penetrating vertically is formed in the center of the case bottom 111. A first shaft 31 and a second shaft 32 of the driving portion 30, which will be described later, penetrate the through hole 115. Further, a discharge hole 116 penetrating vertically is provided at the center portion of the case top plate portion 114.

<1.1.2 construction of shaft holding part 12 >

As shown in fig. 1, the shaft holding portion 12 is a cylindrical shape that is disposed at a central portion of the housing bottom portion 111 and extends vertically. The center of the shaft holding portion 12 coincides with the central axis C1. The shaft holding portion 12 is fixed to the housing bottom portion 111 by a fixing member such as a screw.

A seal (here, a labyrinth seal) is formed at an upper end portion of the shaft holding portion 12. This can suppress the inflow of the gas flow containing the powder or granule into the shaft holding portion 12 without interfering with the rotation of the first rotating body 41.

<1.1.3 construction of raw Material-receiving well 13 >

The raw material receiving hole 13 receives the block-shaped raw material supplied from the raw material supply portion 20 into the housing tube portion 112, that is, the inside of the housing 10. As shown in fig. 1, the raw material receiving hole 13 is a through hole provided in the housing tube 112 and penetrating in the radial direction. The raw material receiving hole 13 is provided on the upper side of the pulverization portion 40 disposed inside the housing cylindrical portion 112.

<1.1.4 construction of airflow inflow part 14 >

The airflow flowing into the airflow inflow portion 14 is supplied with an airflow flowing from the outside to the inside of the housing tube portion 112. As shown in fig. 1, the airflow inlet 14 is a through hole provided in the housing tube 112 and penetrating in the radial direction. The airflow inflow portion 14 is provided on the lower side than the pulverization portion 40.

<1.1.5 construction of bottom cover 15 >

The bottom cover 15 is provided inside the housing tube 112 on the lower side than the pulverization portion 40. The bottom cover 15 has a circular ring shape. The bottom cover 15 and the first rotating body 41 face each other with a gap therebetween in the vertical direction. Further, an air flow flows into a gap between the upper surface of the bottom cover 15 and the lower surface of the first rotating body 41 of the crushing portion 40. The pulverized powder or granule in the pulverizing section 40 is conveyed upward and inward by the airflow. Therefore, the airflow supplied from the airflow inflow portion 14 is referred to as a transport airflow for transporting the powder or granule.

<1.2 construction of raw Material supply portion 20 >

As shown in fig. 1, the raw material supply unit 20 includes a raw material supply pipe 21 and a screw conveyor 22. The material supply pipe 21 is a pipe body, and is fixed so that a part thereof is inserted into the housing tube 112 from the material receiving hole 13. A screw conveyor 22 is rotatably disposed inside the material supply pipe 21. The screw conveyor 22 rotates to move the lump raw material along the raw material supply pipe 21. The raw material in a lump form moved by the screw conveyor 22 is charged into the housing tube 112 through the raw material receiving hole 13. In addition, a conveying method other than the screw conveyor may be adopted.

<1.3 construction of drive section 30 >

The driving unit 30 drives the pulverization unit 40 and the swirling-air-flow generation unit 50. As shown in fig. 1, the driving unit 30 includes a first shaft 31, a second shaft 32, a first belt 331, and a second belt 332.

<1.3.1 Structure of first shaft 31 >

The first shaft 31 is cylindrical. A first rotating body 41 is fixed at the upper end of the first shaft 31. The first shaft 31 is rotatably supported via a bearing, not shown, disposed inside the shaft holding portion 12. The first shaft 31 is supported by the shaft holding portion 12 in the vertical direction and is supported to be rotatable about the central axis C1.

The lower end of the first shaft 31 penetrates the through hole 115 of the case bottom 111 and protrudes downward from the case bottom 111. A first pulley 311 is fixed to a lower end portion of the first shaft 31 so as to be locked by the first shaft 31. Examples of a method of fixing the first pulley 311 include press fitting, welding, and bonding, but are not limited thereto. Further, in order to reliably perform rotation stopping, a key and a key groove may be used. The first shaft 31 may have a cross-sectional shape other than a circular shape to prevent rotation.

A first belt 331 is wound around the first pulley 311. A rotational force is transmitted from a motor, not shown, via the first belt 331, and the first pulley 311 rotates around the center axis C1. Thereby, the first shaft 31 to which the first pulley 311 is attached and the first rotating body 41 fixed to the first shaft 31 rotate around the center axis C1.

<1.3.2 Structure of second shaft 32 >

The second shaft 32 is cylindrical and is disposed inside the cylindrical first shaft 31. The second shaft 32 is rotatably supported by the first shaft 31 via a bearing not shown. That is, the second shaft 32 is supported by the shaft holding portion 12 so as to be rotatable about the central axis C1.

The lower end of the second shaft 32 protrudes downward from the lower end of the first shaft 31. A second pulley 321 is fixed to a portion of the second shaft 32 that protrudes downward from the lower end of the first shaft 31 while being prevented from rotating. Examples of a method of fixing the second pulley 321 include press fitting, welding, and bonding, but are not limited thereto. Further, a key and a key groove may be used to reliably perform the rotation stop. The second shaft 32 may have a cross-sectional shape other than a circular shape to prevent rotation.

A second belt 332 is wound around the second pulley 321. A rotational force is transmitted from a motor, not shown, via the second belt 332, and the second pulley 321 is rotated around the center shaft C1. Thereby, the second shaft 32 to which the second pulley 321 is attached and the second rotating body 51 fixed to the second shaft 32 rotate around the center axis C1.

Since the first pulley 311 and the second pulley 321 are configured to be rotatable at different rotation speeds, driving forces may be transmitted from different motors. Further, by using the speed reducer, the first pulley 311 and the second pulley 321 can be rotated at different rotational speeds by a common motor. Here, the different rotation speeds include the case where the rotation directions are the same, and also include the case where the rotation directions are different.

<1.4 construction of grinding section 40 >

The crushing portion 40 is disposed below the raw material supply portion 20. The crushing unit 40 crushes the lump raw material supplied from the raw material supply unit 20 into powder and granular material. Here, the details of the crushing section 40 will be described with reference to new drawings. Fig. 2 is a plan view of the crushing section. FIG. 3 is a sectional view of the pulverization section shown in FIG. 2 taken along the line III-III. As shown in fig. 1 to 3, the crushing portion 40 is disposed inside the case tube 112, and includes a first rotating body 41, a hammer 42, and a liner 43.

<1.4.1 construction of first rotating body 41 >

As shown in fig. 2, the first rotating body 41 is circular when viewed from the vertical direction. That is, the first rotating body 41 has a disc shape. A shaft fixing hole 411 is provided at the center of the first rotating body 41 so as to penetrate vertically. The shaft fixing hole 411 is used to fix the first shaft 31 by being locked. The fixation between the first shaft 31 and the shaft fixing hole 411 may be performed by press fitting, for example. Further, other fixing methods that can perform fixing, such as screw welding and adhesion, can be widely used. Further, the rotation stop may be reliably performed using a key groove and a key, or the rotation stop may be performed by setting the cross-sectional shape of the first shaft 31 to a shape other than a circle.

As shown in fig. 2 and 3, the upper surface of the first rotating body 41 includes a plurality of (here, 12) weight attachment portions 412 at the outer edge. As shown in fig. 3, the hammer mount 412 is a recess recessed downward from the upper surface of the first rotating body 41. The hammer body mounting portions 412 are arranged at equal intervals in the circumferential direction. The hammer mount 412 extends inward from the outer edge of the first rotating body 41. The inner side of the hammer body mounting portion 412 is formed in an arc shape.

<1.4.2 Structure of hammer 42 >

The hammer 42 is an example of a pulverizing member. The hammer 42 includes a hammer base 421, a rising portion 422, and a crushing blade 423. The hammer base 421 is flat and inserted into the hammer mounting portion 412. The weight base 421 is fixed to the first rotating body 41 by, for example, a screw 40a (see fig. 2 and 3). The fixing method may be welding, bonding, or the like.

The rising portion 422 integrally protrudes from one end of the hammer base 421 to one side. As shown in fig. 3, when the weight base 421 is inserted into the weight mounting portion 412, the rising portion 422 rises upward. The crushing blade 423 is disposed radially outside the rising portion 422. The crushing blade 423 has a plurality of projections and recesses extending vertically. The irregularities may extend parallel to the central axis C1, or may be inclined in the circumferential direction with respect to the central axis C1.

<1.4.3 Structure of liner 43 >

As shown in fig. 3, the liner 43 is annular. The inner surface of the liner 43 is opposed to the outer surface of the hammer 42 with a gap therebetween in the radial direction. The liner 43 includes a plurality of liner pieces 431, and the liner pieces 431 are arranged in line along the inner circumferential surface of the shell tube portion 112 so as to contact each other in the circumferential direction. Thereby, the inner peripheral surface of the liner 43 facing the weight 42 is formed in a polygonal ring shape. The lining piece 431 may be fixed to the housing tube 112 by screws, for example. The liner sheet 431 has a crushing blade 432 having an uneven surface formed on one inner surface thereof. The crushing blade 432 may have projections and depressions extending in the vertical direction, similarly to the crushing blade 423 of the hammer 42. The crushing blades 432 may be formed so that the concave grooves intersect each other, and the convex portions may be formed in a polygonal shape such as a square or a regular triangle. Further, the pin-shaped projections may be two-dimensionally arranged.

By rotating the first rotating body 41, the crushing blades 423 of the hammer 42 and the crushing blades 432 of the liner piece 431 move relative to each other in the circumferential direction. When the first rotating body 41 rotates at a high speed, the crushing

blades

423 and 432 crush the lump raw material. Therefore, at least the crushing blade 423 in the hammer 42 and at least the crushing blade 432 in the liner 431 are formed of ceramics (alumina, zirconia, or the like), tungsten carbide, cemented carbide, tool steel, or the like, which has high strength and hardness and excellent wear resistance. The entire hammer body 42 may be formed of these materials. The material having high wear resistance is an example, and is not limited to these materials.

The surface of the liner sheet 431 on which the crushing blade 432 is formed is flat. Therefore, the liner sheet 431 can be easily manufactured as compared with a structure in which the grinding blade 432 is provided on a curved surface. Further, by changing the number of the lining pieces 431, the inner diameter of the lining 43 can be changed within a certain range. Therefore, the liner sheet 431 can be shared with the liners 43 having different sizes. Further, since the liner piece 431 has a simple shape, the liner piece 431 is easily manufactured using a material, for example, ceramics, which is difficult to process a complicated shape. This can reduce the cost required for manufacturing the powder processing apparatus a. Further, the crushing blade 432 may be formed on the inner surface of the annular liner 43.

Although omitted in the present embodiment, an upper panel may be attached to the upper surface of the first rotating body 41. The upper plate is provided to suppress damage, wear, and the like of the first rotating body 41, the weight body 42, the screw 40a, and the like, which are caused by collision of the raw material fed from the raw material receiving hole 13. The upper panel may be made of a material having excellent abrasion resistance.

<1.5 construction of swirl flow generating part 50 >

The swirling-flow generating portion 50 is disposed above the pulverization portion 40 inside the housing 10. That is, the discharge hole 116 is provided above the swirling airflow generating portion 50. The swirling-air-flow generating portion 50 generates swirling air flow inside the housing 10 by rotating. The swirling airflow generating unit 50 generates a swirling airflow to apply a centrifugal force to the powder or granule. The details of the swirling-flow generating portion 50 will be described with reference to the new drawings. Fig. 4 is a plan view of the swirling airflow generating portion and the guide portion. As shown in fig. 1 and 4, the swirling-air-flow generating portion 50 includes a second rotating body 51 and a plurality of plates 52.

<1.5.1 Structure of second rotating body 51 >

As shown in fig. 4, the second rotating body 51 has a circular shape in a plan view. That is, the second rotating body 51 has a disc shape. The second rotating body 51 is fixed to the second shaft 32 while being prevented from rotating. The centers of the second rotating body 51 and the second shaft 32 overlap the center axis C1. The second shaft 32 may be fixed by press-fitting into a through hole not shown, or by a method such as screw fastening, welding, or bonding. Further, the detent may be implemented using a key or a key groove. As a result, the second rotor 51, that is, the swirling-air flow generating portion 50 rotates about the central axis C1 by rotating the second shaft 32.

<1.5.2 construction of blade 52 >

A plurality of blades 52 extending radially are fixed to the upper surface of the second rotating body 51 at equal intervals in the circumferential direction. The plurality of blades may be fixed by, for example, welding, adhesion, or the like after being inserted into a groove formed on the upper surface of the second rotating body 51. The upper side of the blade 52 fixed to the upper surface of the second rotating body 51 is expanded outward. That is, when the swirling airflow generating portion 50 rotates, the portion through which the outer end portion of the upper end portion of the blade 52 passes becomes the outermost portion in the passing region of the blade 52.

The blades 52 have a surface orthogonal to the swirling direction of the swirling airflow generating portion 50. By rotating the swirling airflow generating portion 50, an airflow flowing in the circumferential direction is generated inside the housing 10. As shown in fig. 4, the swirling airflow generating portion 50 rotates in the counterclockwise direction Rd in a plan view. By the rotation of the swirling air flow generating portion 50, an air flow (hereinafter referred to as a swirling air flow) that swirls in the counterclockwise direction Rd along the housing tube portion 112 is generated inside the housing 10, that is, the housing tube portion 112. Although the details will be described later, the powder or granule is screened (hereinafter, classified) according to the size of the particle by the swirling airflow generated by the swirling airflow generating unit 50.

<1.6 construction of guide section 60 >

As shown in fig. 1 and 4, the guide portion 60 includes a guide plate 61 and a support rib 62 disposed inside the housing tube 112. The guide plate 61 is an example of a guide member.

<1.6.1 construction of guide plate 61 >

As shown in fig. 4, a plurality of (here, six) guide plates 61 are arranged at equal intervals in the circumferential direction inside the housing tube portion 112. The guide plate 61 is a rectangular plate, and the guide plate 61 extends up and down. The guide plate 61 includes a guide surface 611 facing the swirling airflow generating portion 50 in the radial direction. As shown in fig. 1, the lower end portion of the guide surface 611 extends to the same or substantially the same position as the lower end portion of the blade 52 of the swirling airflow generating portion 50.

As shown in fig. 4, the guide plate 61 is fixed to the inner surface of the housing tube 112 so that the swirling airflow generating portion 50 of the guide surface 611, that is, the front side and the rear side in the rotation direction of the second rotating body 51 are located inward. The guide plate 61 may be fixed by welding, bonding, or the like, but is not limited thereto, and may be fixed by being inserted into a groove provided in the housing tube 112. A fixing method capable of reliably fixing the guide plate 61 can be widely adopted.

As shown in fig. 4, a surface 612 extending in the circumferential direction from the leading end portion of the guide surface 611 in the rotational direction of the swirling airflow generating portion 50 is located outside the region through which the blades 52 of the swirling airflow generating portion 50 pass. The guide surface 611 guides the airflow generated by the swirling airflow generating portion 50 inward so as not to be directly blown to the swirling airflow generating portion 50. This suppresses the collision of the powder or granule swirled by the swirling airflow with the blade 52, and guides the powder or granule inward.

<1.6.2 Structure of support Rib 62 >

As shown in fig. 1 and 4, the support rib 62 is a plate-like member fixed to the surface opposite to the guide surface 611 of the guide plate 61 and the inner surface of the housing tube 112. The support ribs 62 fix the guide plate 61. By providing the support ribs 62, the deflection occurring when the airflow is blown onto the guide plate 61 is suppressed, and the guide plate 61 guides the swirling airflow inward.

In the present embodiment, one support rib 62 is provided at the upper and lower center of the guide plate 61. However, the support rib 62 may be provided in plurality. Further, the support rib 62 may be provided to support the entire guide plate 61.

<1.6.3 Another example of the guide >

Other examples of the guide portion 60 will be explained. Fig. 5 is a sectional view showing another mounting method of the guide plate. As shown in fig. 5, the guide plate 61 may be fixed to the lower surface of the case top plate 114. Although the guide plate 61 is fixed to the case top plate portion 114 by screw fastening in fig. 5, a method such as welding or welding may be employed in addition to screw fastening. As shown in fig. 5, the guide plate may be a guide plate 61a directly attached and fixed to the lower surface of the case top plate 114, or a guide plate 61b inserted and fixed into a recess formed in the lower surface of the case top plate 114 and recessed upward. With this configuration, the guide plates (61a, 61b) can be taken out by detaching the housing top plate portion 114, and therefore maintenance of the guide plates (61a, 61b) is facilitated. In addition, when the guide plate is attached to the housing top plate 114, the guide plate only needs to have a shape that is less likely to interfere with opening and closing of the housing top plate 114. Further, the case top plate portion 114 may be attached to the flange portion 113 without a hinge.

Fig. 6 is a plan view showing another example of the guide section used in the powder processing apparatus according to the present invention. As shown in fig. 6, the guide portion may be a curved guide plate 63. In the guide plate 63, the guide surface 631 is also curved. The guide plate 63 is disposed so that a surface 632 extending from the distal end of the guide surface 631 in the rotation direction of the second rotating body 51 in the circumferential direction is located outside the region through which the plate 52 of the swirling airflow generating unit 50 passes. By providing the guide surface 631 having a curved surface in this manner, the swirling airflow can be smoothly guided. The guide surface 631 is a curved surface projecting outward, but is not limited thereto, and may be a curved surface projecting inward. A shape in which a vortex is not easily generated by the flow velocity of the swirling airflow, the viscosity of the airflow, or the like can be widely used.

Further, guide

members

64, 65, 66 as shown in fig. 7 may be provided. Fig. 7 is a plan view showing still another example of the guide portion. As shown in fig. 7, the guide member 64 may be a guide member 64 that protrudes in the radial direction, instead of a flat plate-shaped guide plate. At this time, the surface of the guide surface 641 of the guide member 64 extending toward the front side in the rotational direction of the second rotating body 51 is located outside the region through which the plate 52 of the swirling airflow generating portion 50 passes. The guide surface 651 may be elongated like the guide member 65, or the guide surface 661 may be curved like the guide member 66. The

guide members

64, 65, 66 may be formed integrally with the housing 11. Further, the

guide members

64, 65, and 66 manufactured as other members may be fixed inside the housing 11.

Surfaces

642, 652, and 662 that extend the front end portions of the second rotating bodies 51 in the rotational direction of the guide surfaces 641, 651, and 661 are located outside the region through which the plate 52 of the swirling airflow generating portion 50 passes.

The guide surfaces 611, 631, 641, 651, 661 described above are formed by surfaces extending in the vertical direction, that is, surfaces located at the same position in the circumferential direction from the upper end to the lower end. However, it is not limited thereto. For example, the upper side of the guide surface may be positioned forward in the rotation direction of the first rotating body 41 with respect to the lower side. This allows the swirling airflow to be smoothly guided inward.

<1.7 construction of gas flow outflow part 70 >

The airflow outflow portion 70 discharges the airflow (air) flowing in from the airflow inflow portion 14 to the outside. As shown in fig. 1, the airflow outflow portion 70 is mounted on the upper surface of the housing top plate portion 114. The airflow outflow portion 70 includes an exhaust tube portion 71 and an exhaust flange 72. The exhaust cylinder portion 71 is cylindrical and communicates with a discharge hole 116 provided at the center of the case top plate portion 114. The air inside the housing 11 flows into the exhaust cylinder 71 through the exhaust hole 116.

The exhaust flange 72 may be disposed on the upper surface of the case top plate portion 114 via a gasket, not shown. The exhaust flange 72 is fixed to the case top plate portion 114 by, for example, screws. This improves the sealing property between the case top plate portion 114 and the exhaust tube portion 71, thereby suppressing the leakage of the airflow. Instead of the gasket, an O-ring or the like may be used. Further, a structure may be adopted in which a concave portion is formed in one of the airflow outlet 70 and the case top plate 114, a convex portion is formed in the other, and the convex portion is inserted into the concave portion, thereby achieving a hermetic structure.

< 2> operation of powder treating apparatus >

The powder processing apparatus a according to the present invention has the above-described configuration. Next, a powder processing system using the powder processing apparatus a will be described, and an operation of the powder processing apparatus included in the powder processing system will be described. Fig. 8 is a schematic configuration diagram of an example of the powder processing system according to the present invention. The powder processing system CL shown in fig. 8 includes a raw material supply device Ma, a powder processing device a, a filter device Ft, and a blower Bw.

The powder processing apparatus a is fixed to the horizontal surface of the base Ca by screws or the like, not shown. The airflow outflow unit 70 of the powder processing apparatus a and the inflow unit Ft3 of the filter device Ft are connected by a pipe. The filter device Ft is, for example, a bag filter. The filter device Ft includes a case Ft1, a partition Ft2, an inflow section Ft3, an outflow section Ft4, a filter medium Ft5, and an outlet Ft 6. In the filter device Ft, the partition Ft2 partitions the interior of the case Ft1 into upper and lower portions. The partition part Ft2 is provided with a plurality of through holes. A cylindrical filter medium Ft5 that surrounds the periphery of the through-hole of the partition part Ft2 and extends downward is disposed below the partition part Ft2 in the casing Ft 1.

The air flow from the powder processing apparatus a flows into the casing Ft1 from the inflow portion Ft3, and flows out to the outside from the outflow portion Ft4 through the filter medium Ft 5. At this time, the powder and granular material is trapped on the outer surface of the filter material Ft 5. In the filter device Ft, compressed gas (compressed air) is periodically blown out from a pipe (not shown) so that the powder and granular material collected by the filter medium Ft5 falls downward.

A take-out port Ft6 is provided at the lower end of the case Ft 1. The powder particles accumulated in the lower portion of the casing Ft5 are taken out through the take-out port Ft 6. In the powder processing system CL, the powder or granule taken out from the take-out port Ft6 is a classified powder or granule, i.e., a product.

The outflow portion Ft4 of the filter device Ft is connected to the blower Bw via a pipe. The blower Bw generates a negative pressure in the pipe connected to the outflow portion Ft 4. By the generation of the negative pressure, an air flow toward the blower Bw is generated in the filter device Ft, the powder processing device a, and the piping connecting these devices. In the powder processing apparatus a, the negative pressure causes an airflow to flow from the airflow inlet 14. Further, a blower (not shown) may be provided outside the airflow inflow portion 14 to forcibly flow the generated airflow.

The operation of the powder processing apparatus a will be described. In the powder processing apparatus a, the lump raw material is supplied from the raw material supply unit 20 while the first rotating body 41 and the second rotating body 51 are rotating. The raw material supplied from the raw material supply unit 20 falls onto the first rotating body 41 of the pulverization unit 40. The raw material is pulverized into powder and granular substances by the pulverizing blade 423 of the hammer 42 and the pulverizing blade 432 of the liner 43.

As described above, in the powder processing apparatus a, air (airflow) flows from the airflow inlet 14 into the casing 11. The airflow flowing in from the airflow inflow portion 14 flows radially outward from the gap between the first rotating body 41 and the bottom cover 15, and flows upward along the housing tubular portion 112 from between the first rotating body 41 and the liner 43. The outflow destination of the airflow is the airflow outflow portion 70. Therefore, the air flow flowing out from between the first rotating body 41 and the lining 43 flows upward and inward. Further, when the gas flow passes between the first rotating body 41 and the lining 43, the gas flow moves together with the pulverized powder. That is, the powder particles pulverized by the pulverizing section 40 are conveyed upward and inward by the conveying airflow.

A swirling airflow is generated in the upper portion of the housing 11 by the swirling airflow generating portion 50. The conveyance airflow flowing in from the airflow inflow portion 14 is merged with the swirling airflow. At this time, two forces, i.e., an inward force F1 generated by the carrier airflow and an outward force F2 generated by the swirling airflow, act on the powder or granule contained in the carrier airflow. The force F1 changes according to the flow rate (flow velocity) of the carrier airflow, and the force F1 increases as the carrier airflow increases. The force F2 changes according to the flow rate (flow velocity) of the swirling airflow, that is, the rotation speed of the swirling airflow generating unit 50, and the force F2 increases as the rotation speed of the swirling airflow generating unit 50 increases.

As described above, the particle diameter of the powder or granule conveyed by the conveyance gas flow together with the gas flow discharged from the gas flow-out portion 70 is determined by the flow rate of the conveyance gas flow and the rotation speed of the swirling-gas-flow generating portion 50. To explain in more detail, the pitch diameter D50 of the powder and granular material discharged from the airflow outlet 70 is proportional to the square root of the flow rate of the conveyance airflow and inversely proportional to the rotation speed of the swirling airflow generating unit 50. In the powder processing apparatus a, the particle diameter of the classified powder or granule discharged from the airflow outlet 70, that is, the particle diameter is adjusted to a predetermined particle diameter by adjusting the flow rate of the conveyance airflow and the rotation speed of the swirling airflow generating unit 50. The intermediate diameter D50 is a diameter in which, when the powder or granule is arranged in order of particle size, the number of powder or granule smaller than the diameter is equal to the number of powder or granule larger than the diameter.

The powder and granular material not discharged from the airflow outlet 70 by classification has a larger particle diameter than the determined particle diameter. Such particles are pushed outward by the swirling airflow and come into contact with the inner surface of the housing tube 112, and thereafter, move downward along the inner surface of the housing tube 112. Then, the powder is pulverized again by the pulverizing blade 423 of the hammer 42 and the pulverizing blade 432 of the liner 43, and then is conveyed upward again by the conveyance air flow.

In this manner, by repeating the pulverization by the hammer 42 and the lining 43, the conveyance by the conveyance airflow, and the classification by the swirling airflow, the powder and granular material in which the raw material is pulverized to a predetermined particle diameter or less is generated. The produced powder is collected by the filter device Ft and taken out.

In the powder treatment apparatus a according to the present invention, the guide plate 61 is disposed inside the casing 11. The guide surface 611 of the guide plate 61 guides the swirl airflow inward. By this operation, the swirling airflow is caused to flow to the inside. The force F1 generated by the swirling air flow can be reduced as compared with the case where the guide plate 61 is not arranged. Therefore, the flow rate of the carrier gas flow and the rotational speed of the swirling-flow generating portion 50 for obtaining a predetermined particle diameter can be reduced. In other words, since the flow rate of the carrier gas flow can be suppressed to be small, the size of the powder or granule can be reduced. Further, by reducing the flow rate of the carrier airflow and the rotation speed of the swirling airflow generating unit 50, the power consumption can be reduced, that is, energy saving can be achieved.

The guide surface 611 is disposed to smoothly guide the swirling airflow inward. Therefore, compared to the conventional structure in which the swirling airflow collides against the plate-like member, the powder or granule is less likely to adhere to the guide plate 61, and the swirling airflow is less likely to generate a vortex. Therefore, the powder or granule can be produced smoothly and efficiently.

Further, by making the high-temperature and low-humidity, i.e., high-temperature dry air flow from the airflow inflow portion 14, the powder processing apparatus a can be also made a so-called airflow drying apparatus that removes moisture from the powder and granular material pulverized by the hammer 42 and the liner 43.

<2.1 Another example of the powder treating apparatus >

In the powder processing apparatus, the particle diameter of the powder or granule moving inward can be adjusted by using the swirling airflow generated by the swirling airflow generating unit 50 and the airflow conveyed by the conveyance airflow. By discharging the powder or granule having a particle diameter smaller than the fixed particle diameter and repeating the grinding between the grinding blade 423 of the hammer 42 and the grinding blade 432 of the liner 43, it is possible to produce a powder or granule having a fixed particle diameter and a small number of sharp portions, that is, a powder or granule close to a spherical shape (referred to as spheroidization). Further, by providing an extraction port, not shown, in the casing cylinder 112 of the powder treatment apparatus a in advance and extracting the powder from the extraction port, the powder and granular material can be obtained in a spherical form.

In this manner, in the powder processing apparatus a, since the swirling airflow is directed inward by the guide surface 611, the powder or granule can be conveyed inward even if the flow rate of the conveyance airflow is low. This makes it difficult for the powder or granule to remain inside the casing 11 even if the flow rate of the carrier gas flow is low. Accordingly, by repeating the pulverization by the pulverizing blade 423 of the hammer 42 and the pulverizing blade 432 of the liner 43, the excessive pulverization by the excessive pulverization can be suppressed, and the generation amount of the fine powder can be suppressed.

< 3> evaluation of powder treating apparatus

Here, the characteristics of the powder processing apparatus a according to the present invention were evaluated. As a comparative example, a conventional powder treatment apparatus P was used. Fig. 9 is a sectional view of a conventional powder treatment apparatus used in a test of a comparative example.

The powder treatment apparatus P shown in fig. 9 has substantially the same configuration as the powder treatment apparatus a shown in fig. 1, except that an inner cylinder 81 and a vertical fin 82 are provided instead of the guide plate 61. Therefore, in the powder processing apparatus P, substantially the same portions as those of the powder processing apparatus a are denoted by the same reference numerals, and detailed description of the same portions is omitted. In fig. 9, the reference numerals of the portions not directly related to the features of the present invention are also omitted.

As shown in fig. 9, the powder processing apparatus P includes an inner cylinder 81 inside a housing tube 112. The inner tube 81 has a tubular shape surrounding the outer side of the swirling airflow generating portion 50. The vertical fin 82 is a flat plate, and connects the outer surface of the inner cylinder 81 to the inner surface of the housing cylinder 112. The vertical fins 82 are provided in plural numbers (for example, six) and arranged in the radial direction.

In the powder processing apparatus P, the powder or granule conveyed by the swirling airflow flows in the circumferential direction along the housing tube 112 and collides with the vertical fins 82. And, it falls downward. The falling powder particles are crushed again by the crushing portion 40. The powder processing apparatus P of the comparative example has such a configuration.

The operation of the powder processing apparatus P will be described. In the powder processing apparatus P, the raw material supplied from the raw material supply unit 20 drops onto the first rotating body 41 of the pulverization unit 40, similarly to the powder processing apparatus a. The raw material is pulverized into powder and granular substances by the pulverizing blade 423 of the hammer 42 and the pulverizing blade 432 of the liner 43. The pulverized raw material is transported by the transport airflow and passes between the inner periphery of the housing tube portion 112 and the outer periphery of the inner tube 81. Thereafter, the powder or granule is classified by the swirling-flow generating unit 50. Then, the powder particles having a particle diameter smaller than the determined particle diameter pass through the gap of the plate 52 and are discharged to the outside through the discharge hole 116. The powder or granule having a particle diameter larger than the determined value moves downward inside the inner cylinder 81 and drops onto the first rotating member 41. The falling powder or granule is crushed again into finer powder or granule having a smaller particle diameter by the crushing blade 423 of the hammer 42 and the crushing blade 432 of the liner 43. In the powder processing apparatus P, the above operations are repeated to break the raw material into powder and granular substances and perform classification.

<3.1 test conditions >

In the following evaluation, the test results using the powder treatment apparatus a of the present invention are set as examples, and the test results using the conventional powder treatment apparatus P are set as comparative examples. The outer diameter of the crushing portion 40 on the outer side of the hammer 42 is set as the hammer outer diameter. The examples and comparative examples were tested under the same conditions. The conditions of the test are as shown below. In addition, a part where the condition is changed for each evaluation will be described for each evaluation. In the graphs used in the following description, examples are shown by four corners and comparative examples are shown by triangles.

Shape of the hammer body crushing blade: longitudinal grooves

The outer diameter of the hammer body: 318.1mm

The number of hammer bodies is as follows: 12 pieces of

Rotation speed of the grinding part: 7000rpm

Rotational speed of the swirling-flow generating portion: 2000 rpm-7000 rpm

Crushing raw materials: ground calcium carbonate (particle size about 1mm)

<3.2 evaluation 1>

In the evaluation 1, the operation conditions of the powder treatment apparatus a and the powder treatment apparatus P were set as described above, and the flow rate of the transport airflow was changed in each powder treatment apparatus to carry out the

tests

1 and 2. The flow rate of the transport gas stream in each test is as follows.

Test 1

Flow rate of transport gas flow: standard flow rate

Test 2

Flow rate of transport gas flow: 1/3 flow of standard flow

The standard flow rate is a flow rate of a gas flow supplied to the powder processing apparatus P, that is, a transport gas flow in a conventional powder processing performed using the powder processing apparatus P. The results of test 1 and test 2 are shown in fig. 10 and 11. Fig. 10 is a graph showing the results of test 1. Fig. 11 is a graph showing the results of test 2. In the graphs shown in FIGS. 10 and 11, the vertical axis represents the pulverization efficiency (kg/kW. multidot.h), and the horizontal axis represents the median diameter (D50 μm). The pulverization efficiency represents the processing capacity of the raw material per unit electric power.

As shown in fig. 10, when the flow rate of the carrier gas flow is large (standard flow rate), the grinding efficiency hardly differs between the examples and the comparative examples. On the other hand, as shown in fig. 11, in the case where the flow rate of the carrier gas flow is small (1/3 of the standard flow rate), the pulverization efficiency of the example is higher than that of the comparative example. That is, it is found that the powder processing apparatus a of the present invention has higher pulverization efficiency than the conventional powder processing apparatus P when the flow rate of the carrier gas flow is small.

<3.3 evaluation 2>

Next, in both the examples and the comparative examples, the flow rate of the carrier gas flow was set to 1/3.75 of the standard flow rate, and the time until the material supply was stopped and then the state of no load, that is, the state of idling was returned was compared. The results are shown in fig. 12. Fig. 12 is a graph showing the time until the pulverizing section returns to the idle state after the supply of the raw material is stopped.

In the graph of fig. 12, the vertical axis represents the time until the load of the grinding part 40 is returned to the minimum, that is, to the idling state after the supply of the raw material is stopped. The horizontal axis represents the median diameter D50 of the produced powder. The time for which the powder and granular material stay inside the casing 11 is the time required for the treatment.

As shown in fig. 12, when the intermediate diameters D50 are the same, the time required for the raw material supply to return to the idling state after stopping is shorter in the example than in the comparative example. That is, when the flow rate of the carrier gas flow is small, the powder processing apparatus a can obtain a powder having a predetermined particle diameter in a shorter processing time until the raw material is pulverized in comparison with the powder processing apparatus P. As described above, the powder processing apparatus a of the present invention can shorten the batch time of the processing compared to the conventional powder processing apparatus P when the flow rate of the carrier gas flow is small.

<3.4 evaluation 3>

Next, the raw material was changed from ground calcium carbonate to scaly graphite (pitch diameter D50 of 85 μm). The grinding blade 432 of the liner 43 is a liner having corner grooves with grooves perpendicular to each other and protrusions having a rectangular shape. The rotation speed of the pulverization portion 40 was 6800rpm in both the examples and the comparative examples, and the rotation speed of the swirling airflow generation portion 50 was 3000rpm and 7000rpm in both the examples and the comparative examples. The flow rate of the carrier gas flow was 1/3 which was the standard flow rate in both the examples and the comparative examples. The test results are shown in fig. 13. Fig. 13 is a graph showing the pulverization efficiency. In the graph of fig. 13, the vertical axis represents the pulverization efficiency and the horizontal axis represents the intermediate diameter D50, as in the graph of fig. 13.

It is understood that even when the raw material is changed from ground calcium carbonate to scaly graphite, the pulverization efficiency of the powder treatment apparatus a according to the present invention is higher than that of the conventional powder treatment apparatus P when the flow rate of the carrier gas flow is small.

<3.5 evaluation 4>

In evaluation 4, a test was performed using polystyrene as a raw material. In the case of using a material such as polystyrene which is not easily broken, when the flow rate of the carrier gas flow is low, the fluctuation of the pulverization load becomes large in the conventional powder processing apparatus P, and stable operation cannot be realized. From this, it is understood that the powder processing apparatus a according to the present invention has higher operation stability at a low air flow rate than the conventional powder processing apparatus P. That is, it is found that the powder treatment apparatus a according to the present invention can achieve a lower air volume than the conventional powder treatment apparatus P.

<3.6 evaluation 5>

Next, in evaluation 5, a test was conducted by using a sheet-like powder coating material (□ 5mm, thickness 1mm) as the raw material. The content ratio (fine powder ratio) of the fine powder (particle size less than 9.25 μm) contained in the powder/granular material discharged from the airflow outlet 70 was obtained as a volume ratio. The conditions of the test were the same as those of test 2 of evaluation 1. The results are shown in fig. 14. Fig. 14 is a graph showing the content of the fine powder contained in the produced powder granules. In fig. 14, the vertical axis represents the fine particle size, and the horizontal axis represents the intermediate diameter D50.

When the powder and granular material having the same intermediate diameter D50 is produced, the powder treatment apparatus a of the present invention has a lower powder fineness ratio than the conventional powder treatment apparatus P. That is, when the same amount of raw material is used to produce the powder or granule having the determined particle diameter, the powder processing apparatus a of the present invention can produce a larger amount of powder or granule than the conventional powder processing apparatus P. That is, the powder processing apparatus a of the present invention is less wasteful than the conventional powder processing apparatus P, and thus the efficiency of powder processing is high.

<3.7 evaluation 6>

In evaluation 6, a test was performed using a powder processing apparatus a1 and a powder processing apparatus P1 different in size from those used in evaluations 1 to 5. The test conditions are shown below.

Shape of the hammer body crushing blade: longitudinal grooves

The outer diameter of the hammer body: 430.3mm

The number of hammer bodies is as follows: 32 (a)

Rotation speed of the grinding part: 6600rpm

Rotational speed of the swirling-flow generating portion: 3000 rpm-5400 rpm

Crushing raw materials: ground calcium carbonate (particle size about 1mm)

Shape of liner disintegrating edge: triangular groove

Flow rate of conveyance gas flow: 2/3 of standard flow

Under the above conditions, the powder treatment apparatus a1 according to the present invention and the conventional powder treatment apparatus P1 were used to perform a test, and the pulverization efficiency was obtained. The test results are shown in fig. 15. Fig. 15 is a graph showing the pulverization efficiency. In fig. 15, the vertical axis represents the pulverization efficiency, and the horizontal axis represents the intermediate diameter D50.

As shown in fig. 15, when the powder processing apparatus a1 according to the present invention was used, the pulverization efficiency was higher than that when the conventional powder processing apparatus P1 was used. From this, it is understood that the powder processing apparatus according to the present invention having the guide surface has a higher pulverization efficiency than the conventional powder processing apparatus even when the size of the powder processing apparatus, the size of the housing, the size of the pulverizing section, and the number of the hammers are changed.

As described above, in the powder processing apparatus according to the present invention, the guide surface for guiding the swirling airflow generated inside the casing to the inside is provided in the casing, so that the powder processing apparatus can achieve a higher pulverization efficiency and a shorter powder processing time than the conventional powder processing apparatus. In addition, the powder processing apparatus according to the present invention requires less raw material to obtain a powder or granule having a predetermined particle diameter than a conventional powder processing apparatus. In the powder treatment apparatus a according to the present invention, the flow rate of the gas flow flowing in can be reduced, that is, the flow rate of the gas flow can be reduced as compared with the conventional powder treatment apparatus P. In addition, in the powder processing apparatus a of the present invention, the size of the produced powder can be made smaller than that of the conventional powder processing apparatus P.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above. In addition, various modifications can be added to the embodiments of the present invention as long as they do not depart from the gist of the invention.

Description of the symbols

10 frame body

11 casing

111 bottom of the shell

112 casing tube part

113 flange part

114 casing top plate

115 through hole

116 discharge hole

12-shaft holding part

13 raw material receiving hole

14 airflow inflow part

15 bottom cover

20 raw material supply part

30 drive part

31 first shaft

311 first pulley

32 second shaft

321 second pulley

331 first band

332 second belt

40 grinding part

41 first rotating body

412 hammer body mounting part

42 hammer body

423 disintegrating blade

43 liner

432 crushing blade

50 swirl flow generating part

51 second rotating body

52 blade

60 guide part

61 guide plate

62 support rib

63 guide plate

64 guide member

65 guide member

66 guide member

70 air flow outlet part

71 exhaust tube part

72 exhaust flange

A powder processing device

CL powder processing system

Ft filter device

Bw blower

Claims

1. A powder treatment device is provided with:

a frame body which is cylindrical and extends in the vertical direction;

a raw material supply unit that supplies a raw material into the housing;

a first rotating body which is disposed below the raw material supply unit and rotates around a central axis extending in a vertical direction;

a pulverization member that is disposed at a radially outer edge portion of the first rotating body and pulverizes the raw material into powder and granular substances;

a swirling airflow generating unit that is disposed above the first rotating body in the housing and generates an airflow in a swirling direction in the housing;

an airflow inflow portion that is disposed below the rotating body of the housing and that allows an airflow to flow into the housing;

an airflow outflow unit that causes the airflow to flow out from an upper portion of the housing,

the housing is provided with a guide portion inside, and the guide portion has a guide surface that faces the swirling airflow generation portion in the radial direction and is positioned radially inward of the front side and the rear side of the swirling airflow generation portion in the rotation direction.

2. The powder treatment apparatus according to claim 1,

the swirling-air-flow generating portion includes a second rotating body that rotates around a central axis, and a plurality of blades that are provided upright in a radial shape on a peripheral portion of the second rotating body.

3. The powder treatment apparatus according to claim 2, wherein,

a surface of the guide surface that extends in the circumferential direction from a leading end portion of the second rotating body in the rotational direction is located radially outward of the swirling-air-flow generating portion.

4. The powder treatment apparatus according to any one of claims 1 to 3, wherein,

the frame body is provided with a cylindrical housing portion which is cylindrical and extends along the central axis,

at least one of the guide portions extends radially inward from the housing tube portion.

5. The powder treatment apparatus according to any one of claims 1 to 4,

a housing top plate portion that is provided at an upper end portion of the housing and that extends in a direction orthogonal to the central axis,

at least one of the guide portions extends downward from a lower surface of the housing top plate portion.

6. The powder treatment apparatus according to any one of claims 1 to 5, wherein,

the guide portion is plate-shaped.

7. The powder processing apparatus according to any one of claim 1 to claim 6,

the guide surface is a curved surface in which a circumferential middle portion bulges in a radial direction.

8. The powder treatment apparatus according to any one of claims 1 to 7,

the upper side of the guide surface is located on the front side in the rotational direction of the swirling airflow generating portion with respect to the lower side.

9. An air flow drying device, wherein,

the powder processing apparatus according to any one of claims 1 to 8,

the airflow drying device makes hot air flow in through the airflow inflow part.

10. A classification apparatus, wherein,

the powder processing apparatus according to any one of claims 1 to 8,

classifying the powder or granule inside the frame,

the air flow discharging device is provided with a collecting part for collecting powder and granular materials contained in the air flow discharged from the air flow discharging part to the outside of the air flow discharging part and having an outer diameter within a predetermined range.

11. A spheroidizing device, wherein,

the powder processing apparatus according to any one of claims 1 to 8,

the frame is provided with a granule removal unit that removes spherical granules, which are spherical granules obtained by removing spherical powder granules formed in the frame to the outside.