JP6293471B2 - Horizontal dry crusher - Google Patents

Description

  The present invention relates to a horizontal dry pulverizer. The horizontal dry pulverizer of the present invention includes alumina, zirconia, ticker aluminum, PZT, tantalum titanate, other ceramics, silicon nitride, silicon carbide, dielectric material, magnetic material, iron oxide, ferrite, silica, battery material, carbon, and magnesium oxide. It is particularly suitable for use for pulverizing raw materials such as calcium carbonate, inorganic pigments, organic pigments and other dry pulverized products into fine particles, but is not limited thereto.

Conventionally, as a horizontal dry pulverizer, one described in Japanese Patent No. 4895534 is known. The horizontal dry pulverizer described in this publication includes a cylindrical pulverization tank having a pulverization chamber, a raw material charging unit provided at one end of the pulverization tank, a media separation unit provided at the other end of the pulverization tank, In a horizontal dry pulverizer provided with a pulverization medium placed in a pulverization chamber, and a stirring member provided in the pulverization chamber and rotatably disposed around a horizontal rotation shaft, the stirring member is at one end side of the pulverization tank. A plurality of frustoconical discs having a tapered surface and a vertical surface that gradually become smaller and a plurality of pins are alternately provided, and a communication hole extending obliquely in the thickness direction of the disc is formed in the disc. The communication hole has a first opening on the relatively inner peripheral side of the vertical surface and a second opening arranged on the outer peripheral side of the first opening on the tapered surface. With features That.
In this horizontal dry pulverizer, a plurality of frustoconical discs are used as a part of the stirring element of the stirring member, a communication hole extending obliquely in the thickness direction of the disk is formed in this disk, Since the first opening has a first opening on the relatively inner peripheral side of the vertical surface and the second opening is arranged on the outer peripheral side of the first opening on the tapered surface, the raw material and pulverization on the downstream side of the disk Part of the media flows back to the upstream side of the disk through the communication hole. By this reflux, the residence time of the pulverized material in the pulverization chamber is increased, and sufficient pulverization is performed. In particular, this reflux gives a large kinetic energy to the pulverizing media, thereby increasing the contact probability between the pulverizing media and increasing the pulverizing ability. As a result, in this horizontal dry pulverizer, the pulverized material can be finely pulverized.

  In such a horizontal dry pulverizer, the pulverized media beads agitated by the agitating member are given a kinetic force and rotate in the circumferential direction. When the pulverization media flow in the circumferential direction in this way, the contact probability between the pulverization media decreases, and the pulverization efficiency of the pulverized material is not so high. Further, the pulverizing media moves while being in contact with the inner wall of the pulverizing tank. Such contact of the grinding media with the inner wall of the grinding tank results in wasteful power consumption. Further, when the pulverized material is pulverized to become fine powder, the adhesion becomes strong, and because it adheres to the inner wall of the pulverization tank, heat exchange is hindered, abnormal heat generation and adhesion are increased, and clogging occurs.

Japanese Patent No. 4895534

Therefore, an object of the present invention is to provide a horizontal dry pulverizer that can suppress wasteful energy consumption and can be stably operated for a long period of time.
Another object of the present invention is to provide a horizontal dry pulverizer capable of preventing the pulverized material that has been pulverized into fine powder from adhering to the inner wall of the pulverization tank and preventing abnormal heat generation and blockage.

The above object is achieved by the horizontal dry pulverizer of the present invention having the following constitutions (1) to ( 13 ).
(1)
A cylindrical pulverization chamber, a pulverization tank that is concentrically continuous with the pulverization chamber and has a cylindrical raw material supply unit for supplying the raw material to the pulverization chamber, and a raw material input unit provided at one end of the pulverization tank A raw material discharge unit via a media separator provided at the other end of the pulverization tank, a pulverization medium placed in the pulverization chamber, a raw material supply unit of the pulverization tank, and a horizontal rotation drive shaft extending into the pulverization chamber And disposed in the raw material supply unit, attached to the horizontal rotary drive shaft, and rotationally driven by the horizontal rotary drive shaft, to supply the raw material charged into the raw material supply unit from the raw material input unit to the grinding chamber A raw material supply member that is disposed in the pulverization chamber, is attached to the horizontal rotation drive shaft, and is rotationally driven by the horizontal rotation drive shaft. In horizontal dry pulverizer and a stirring member for stirring crushed while continuously conveyed toward the material discharging section from the raw material supply unit,
In the pulverization chamber, on the outside of the stirring member, a deflector that extends in the length direction of the pulverization chamber and moves from the inside to the outside by the centrifugal force by the stirring member can be rotated by a deflector that directs the inside from the outside to the inside. arranged to,
The deflector is provided with a plurality of openings extending in the length direction and spaced apart in the rotation direction, thereby forming a plurality of plate-like sections, and a deflector support member having a polygonal or circular cross section. A horizontal dry pulverizer comprising a plurality of deflector plates fixed to the outer surface of the deflector support member and rising outward in the radial direction .
( 2 )
The horizontal dry pulverizer according to ( 1 ), wherein the deflector plate extends on a surface including a rotation shaft of the deflector support member.
( 3 )
The horizontal dry pulverizer according to ( 1 ), wherein the deflector plate is inclined and linearly extended from a surface including a rotation shaft of the deflector support member.
( 4 )
The horizontal dry pulverizer according to ( 1 ), wherein the deflector plate extends linearly obliquely with respect to a central axis of the deflector support member.
( 5 )
The horizontal dry pulverizer according to ( 1 ), wherein the deflector plate extends spirally around the deflector support member.
( 6 )
The horizontal type according to any one of (1) to ( 5 ), wherein the deflector is rotationally driven in a differential state with respect to the stirring member by a deflector rotation drive shaft and driven separately from the stirring member. Dry crusher.
(7)
The horizontal dry pulverizer according to any one of (1) to ( 6 ), wherein a circumferential speed of the deflector is smaller than a circumferential speed of the stirring member.
( 8 )
The horizontal dry pulverizer according to any one of (1) to ( 7 ), wherein a rotation direction of the deflector is opposite to a rotation direction of the stirring member.
( 9 )
An outer edge of the deflector plate is disposed at a predetermined interval with respect to the inner peripheral surface of the pulverization tank, and serves as a scraping member for scraping the fine crushed material adhering to or adhering to the inner peripheral surface of the pulverization tank. The horizontal dry pulverizer according to any one of ( 1 ) to ( 5 ), which is adapted to act.
( 10 )
The horizontal dry pulverizer according to ( 9 ), wherein the predetermined interval is 0.2 to 0.7 mm.
( 11 )
A fixed annular disc provided in the raw material discharge portion of the pulverization tank, and an outer peripheral portion thereof is arranged at a predetermined distance from an inner peripheral portion of the fixed annular disc inside the fixed annular disc, and is driven by the deflector rotation drive shaft. The horizontal dry pulverizer according to (6 ), further including a media separator including a rotating disk configured to be driven to rotate.
( 12 )
The horizontal dry pulverizer according to ( 9 ), wherein the predetermined interval is 1/6 to 1 / 2.5 of the diameter of the pulverizing medium used.
( 13 )
A jacket is provided on the outer peripheral side of the pulverization tank so as to be spaced from the pulverization tank, and cooling water for heating the pulverization tank and the pulverization chamber or heated water flows through the jacket. The horizontal dry pulverizer according to any one of (1) to ( 12 ).

In the horizontal dry pulverizer according to the present invention, as described above, a pulverization medium that moves from the outside to the outside by the centrifugal force of the stirring member in the pulverization chamber is provided from the outside. By arranging a deflector facing inward, the flow direction of the grinding media in the circumferential direction is changed to the axial center side, thereby making the movement of the grinding media dynamic, thereby increasing the contact probability between the grinding media. Increase the grinding efficiency. Further, since the contact of the grinding media with the inner surface of the grinding tank can be suppressed as much as possible, wasteful energy consumption can be suppressed. Furthermore, by preventing the crushed pulverized material from adhering to the inner wall of the pulverization tank, heat exchange with the cooling water in the outer cooling cylinder provided on the outside is good, and the temperature control of the treated crushed material It is easy to prevent clogging due to abnormal heat generation or adhesion. The latter effect is that the outer edge of the deflector plate is arranged at a predetermined minute interval with respect to the inner peripheral surface of the pulverization tank, and is attached to the inner peripheral surface of the pulverization tank. In the case where it is made to act as a scraping member for scraping out, it is further promoted.

  The rotary gap separator provided on the outlet side of the pulverization tank is less likely to be clogged than the conventional screen (rooster) type and has good dischargeability.

1 is a longitudinal sectional view showing a horizontal dry pulverizer according to an embodiment of the present invention. It is a perspective view of the deflector used for the horizontal dry-type grinder of FIG. It is a perspective view which shows the modification of the deflector used for the horizontal dry-type grinder of FIG. It is a perspective view which shows the other modification of the deflector used for the horizontal type dry crusher of FIG. FIG. 2 is a transverse cross-sectional view for explaining a movement state of grinding media in the horizontal dry grinding machine of FIG. 1.

Hereinafter, a horizontal dry pulverizer according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a horizontal dry pulverizer 10 according to an embodiment of the present invention. The horizontal dry pulverizer 10 is internally concentrically connected to a pulverization chamber 12 and the pulverization chamber 12. A horizontal cylindrical crushing tank 14 having a cylindrical raw material supply unit 13 for supplying the raw material to the inside is provided. The pulverization tank 14 is preferably made of a ceramic such as alumina, alumina zirconia and silicon nitride which are heat resistant materials. A casing 16 is provided at one end of the pulverization tank 14 (upstream side in the raw material flow—hereinafter, this member is referred to as one end for all members and parts), and the other end (downstream side in the raw material flow—following, all A medium separator 18 and a discharge box 20 for discharging the pulverized product are respectively attached to members and parts. The raw material supply unit 13 at one end of the crushing tank 14 is provided with a raw material injection nozzle 22 as shown in the figure.

  A rotary drive shaft 24 extending horizontally from the casing 16 to the grinding chamber 12 through the raw material supply unit 13 extends inside the grinding tank 14. The rotational drive shaft 24 is disposed coaxially with the crushing tank 14. In the raw material supply unit 13, one end side of the rotary drive shaft 24 (below the raw material charging nozzle 22) is crushed as the raw material charged from the raw material charging nozzle 22 toward the other end toward the grinding chamber 12. A screw 26 which is a mechanical thrust generating means for applying a thrust is provided. On the other end side of the screw 26 on the rotary drive shaft 24, that is, in the grinding chamber 12, a first stirring arm 30 and a second stirring arm 32 that are stirring elements constituting the stirring member 28 are spaced apart in the axial direction. Alternatingly arranged. The first stirring arm 30 is a pin-like member that is implanted on the rotary drive shaft 24. The second stirring arm 32 includes a substantially truncated cone-shaped disk 38 having a tapered surface 34 and a vertical surface 36 that gradually decrease toward one end of the grinding tank 14 and a protrusion 40 provided on the outer periphery thereof. And is formed from. The stirring member 28 is preferably made of a ceramic such as zirconia, silicon nitride and alumina which are wear resistant materials.

  In the pulverization chamber 12, a pulverization medium M is accommodated. The pulverization medium M is in a granular form having a diameter of several millimeters, and the pulverization chamber 12 has about 50 to 80% of the capacity of the pulverization chamber 12. It is preferable that it is filled.

  In the horizontal dry pulverizer 10, as shown in the drawing, the diameter of the raw material supply unit 13 is made smaller than the diameter of the pulverization chamber 12, and the diameter of the screw 26, which is a mechanical thrust generating means, is set to a small diameter corresponding thereto. did. The diameter of the raw material supply unit 13 is preferably about 1/3 to 1/2 of the diameter of the crushing chamber 12. If the diameter of the raw material supply unit 13 is reduced beyond the above range, the supply of the pulverized material (raw material) to the crushing chamber 12 becomes insufficient, the work is not efficient, and if the diameter is increased beyond the above range, the screw 26 The diameter also increases, and the effect of suppressing centrifugal force is not sufficient.

  The rotary drive shaft 24 is rotatably supported by the casing 16 by a bearing (not shown), is connected to a drive source via a well-known drive mechanism (not shown), and is driven to rotate. The rotary drive shaft 24 is shaft-sealed by an oil seal 48 or the like at a portion between the bearing and the screw 26, and the inside of the crushing chamber 12 is kept sealed. A lantern ring 50 is provided in a portion (a portion adjacent to the oil seal) on the side of the pulverization chamber 12 from the oil seal 48 of the rotary drive shaft 24, and a gas introduction passage 52 is communicated with the lantern ring 50. ing. A gas such as air is introduced from the gas introduction passage 52. The introduced gas flows into the pulverization chamber 12 through the lantern ring 50 and prevents the raw material from entering the oil seal 48. This gas also serves to fluidize the crushed material (powder) and improve fluidity.

  A jacket 54 is provided on the outer peripheral side of the pulverization tank 14 at a distance from the pulverization tank 14, and cooling water for cooling the pulverization tank and the pulverization chamber flows through the jacket 54. Yes. In the figure, reference numeral 56 denotes a cooling water inlet nozzle, and reference numeral 58 denotes a cooling water outlet nozzle. The liquid supplied into the jacket 54 may be heated water in some cases.

  Inside the crushing chamber 12, a deflector 60 is disposed on the outside of the agitating member 28 to direct the crushing media M that moves from the inside to the outside due to the centrifugal force generated by the agitating member.

As shown in FIG. 2, the deflector 60 is provided with a plurality of openings 62 extending in the length direction and arranged at intervals in the rotation direction, thereby forming a plurality of plate-like portions 64. Is provided with a circular deflector support member 66, and a plurality of deflector plates 68 fixed to the outer surface of the deflector support member 66 and rising outward in the radial direction. The cross section of the deflector support member 66 may be a polygon such as a triangle, a quadrangle, or a hexagon.
The deflector plate 68 extends on the plate-like portion 64 and on a surface including the rotation shaft of the deflector support member 66.

  Alternatively, as shown in FIG. 3, the deflector plate 68 may be inclined in a straight line extending from a plane including the rotation axis of the deflector support member 66. The deflector plate 68 may extend linearly obliquely with respect to the central axis of the deflector support member 66.

  Alternatively, the deflector plate 68 may extend spirally around the deflector support member 66 as shown in FIG.

The deflector 60 is rotationally driven in a differential state with the agitating member 28 by a deflector rotating drive shaft 70 extending from the opposite side of the rotational drive shaft 24 and driven separately from the agitating member 28. It is preferable.
The circumferential speed of the deflector is preferably smaller than the circumferential speed of the stirring member, and the rotation direction of the deflector is opposite to the rotation direction of the stirring member. Since the movement direction of the deflector plate becomes a counter with respect to the movement direction in the circumferential direction of the grinding media M, the function as a deflector can be more effectively exhibited.

The outer edge of the deflector plate 68 is disposed at a predetermined minute interval e1 with respect to the inner peripheral surface of the pulverizing tank 14, and the fine crushed material that adheres to or is about to adhere to the inner peripheral surface of the pulverizing tank 14. It is preferable to act as a scraping member for scraping.
The predetermined minute interval e1 is preferably 0.2 to 0.7 mm.

The media separator 18 includes a fixed annular disk 72 provided in a raw material discharge portion of the crushing tank 14, and an outer peripheral portion of the media separator 18 inside the fixed annular disk 72 and a predetermined minute diameter with the inner peripheral portion of the fixed annular disk 72. It is preferable to have a structure including a rotating disk 74 that is arranged at a small interval e2 and is driven to rotate by the deflector rotation driving shaft 70. The predetermined minute interval e2 is preferably 1/6 to 1 / 2.5, particularly 1/6 to 1/3 of the diameter of the grinding media to be used.

Next, the operation of the horizontal dry pulverizer 10 will be described.
First, when a pulverized material is quantitatively supplied to the raw material supply nozzle 22 with an appropriate quantitative feeder (not shown), the crushed material falls on a screw 26 in the pulverizing chamber 12, and the screw 26 causes the other end side of the pulverizing chamber 12 to move. Proceed to At this time, the thrust from the crushed material is also promoted by the gas from the gas introduction passage 52.
The raw material is rotated and stirred together with the grinding medium M by the stirring member 28 while being conveyed toward the other end inside the grinding chamber 12, is pinched between the grinding media M, is subjected to impact force and grinding action, and is gradually crushed. The At the time of this pulverization, in the conventional horizontal dry pulverizer, the pulverized material and the pulverization media M tend to move in the circumferential direction in the outer peripheral portion of the pulverization chamber 12, but in the horizontal dry pulverizer 10 of the present invention, the deflector 60, the deflector plate 64 mainly acts on the grinding media M about to move in the circumferential direction, and the flow of the crushed material and the grinding media M is changed to the flow f having a component oriented in the central direction, and the grinding media M is crushed. The reflux is directed from the center of the chamber 12 toward the outer periphery and from the outer periphery toward the center. By this reflux, the residence time of the pulverized material in the pulverization chamber is increased, and sufficient pulverization is performed. In particular, this reflux gives large kinetic energy to the grinding media, increasing the contact probability between the grinding media and increasing the grinding ability.
The sufficiently pulverized and refined pulverized material is separated from the pulverized media M by the media separator 18, passes through the media separator, and is collected as a product in the discharge box 20.

  Note that the pulverized material (powder) may be agglomerated when it is refined, and may adhere to and accumulate on the inner peripheral surface of the pulverizing tank 14, but in the horizontal dry pulverizer of the present invention, the deflector plate Since the outer edge 64 acts as a scraping means, this adhesion accumulation can be prevented. In addition, when it is made finer, it may agglomerate, and even if the pulverization energy of the stirring member is added, there is a problem that it does not become small but conversely becomes large. This problem can be solved by adding a grinding aid such as alcohol from the raw material charging nozzle 22. The introduction of the grinding aid also acts to some extent on the solution of the adhesion deposition problem.

  Further, during the pulverization operation, cooling water is flowed into the jacket 54 to keep the temperature in the pulverization chamber 12 at a predetermined temperature.

In the horizontal dry pulverizer of the present invention described above, the pulverizing media moving from the inside to the outside by the centrifugal force by the stirring member is arranged in the circumferential direction of the pulverizing media by arranging the deflectors directed from the outside to the inside. By changing the direction of the flow to the axial center side, thereby making the movement of the grinding media dynamic, the contact probability between the grinding media is increased and the grinding efficiency is improved. Further, since the contact of the grinding media with the inner surface of the grinding tank can be suppressed as much as possible, wasteful energy consumption can be suppressed. Furthermore, by preventing the crushed pulverized material from adhering to the inner wall of the pulverization tank, heat exchange with the cooling water in the outer cooling cylinder provided on the outside is good, and the temperature control of the treated crushed material It is easy to prevent abnormal heat generation and blockage. The latter effect is that the outer edge of the deflector plate is arranged at a predetermined minute interval with respect to the inner peripheral surface of the pulverization tank, and is attached to the inner peripheral surface of the pulverization tank. In the case where it is made to act as a scraping member for scraping out, it is further promoted.
In the present invention, since the rotary gap separator is employed as the media separator, the pulverized material (commodity) that is hard to be clogged and is finely discharged is excellent.

DESCRIPTION OF SYMBOLS 10 Horizontal type dry crusher 12 Crushing chamber 13 Raw material supply part 14 Crushing tank 16 Casing 18 Media separator 20 Discharge box 22 Raw material input nozzle 24 Rotation drive shaft 26 Screw 28 Stirring member 30 First stirring arm 32 Second stirring arm 34 Tapered surface 36 Vertical surface 38 Disc 40 Projection 48 Oil seal 50 Lantern ring 52 Gas introduction passage 54 Jacket 56 Cooling water inlet nozzle 58 Cooling water outlet nozzle 60 Deflector 62 Opening 64 Plate portion 66 Deflector support member 68 Deflector plate 70 Deflector rotation drive shaft 72 Fixed Annular disc 74 Rotating disc

Claims (13)

A cylindrical pulverization chamber, a pulverization tank that is concentrically continuous with the pulverization chamber and has a cylindrical raw material supply unit for supplying the raw material to the pulverization chamber, and a raw material input unit provided at one end of the pulverization tank A raw material discharge unit via a media separator provided at the other end of the pulverization tank, a pulverization medium placed in the pulverization chamber, a raw material supply unit of the pulverization tank, and a horizontal rotation drive shaft extending into the pulverization chamber And disposed in the raw material supply unit, attached to the horizontal rotary drive shaft, and rotationally driven by the horizontal rotary drive shaft, to supply the raw material charged into the raw material supply unit from the raw material input unit to the grinding chamber A raw material supply member that is disposed in the pulverization chamber, is attached to the horizontal rotation drive shaft, and is rotationally driven by the horizontal rotation drive shaft. In horizontal dry pulverizer and a stirring member for stirring crushed while continuously conveyed toward the material discharging section from the raw material supply unit,
In the pulverization chamber, on the outside of the stirring member, a deflector that extends in the length direction of the pulverization chamber and moves from the inside to the outside by the centrifugal force by the stirring member can be rotated by a deflector that directs the inside from the outside to the inside. arranged to,
The deflector is provided with a plurality of openings extending in the length direction and spaced apart in the rotation direction, thereby forming a plurality of plate-like sections, and a deflector support member having a polygonal or circular cross section. A horizontal dry pulverizer, comprising: a plurality of deflector plates fixed to the outer surface of the deflector support member and rising outward in the radial direction . The horizontal dry pulverizer according to claim 1 , wherein the deflector plate extends on a surface including a rotation shaft of the deflector support member. 2. The horizontal dry pulverizer according to claim 1 , wherein the deflector plate is inclined linearly from a surface including a rotation shaft of the deflector support member. The horizontal dry pulverizer according to claim 1 , wherein the deflector plate extends linearly obliquely with respect to a central axis of the deflector support member. The horizontal dry pulverizer according to claim 1 , wherein the deflector plate extends spirally around the deflector support member. The horizontal dry pulverizer according to any one of claims 1 to 5 , wherein the deflector is rotationally driven in a differential state with respect to the agitating member by a deflector rotation drive shaft and driven separately from the agitating member. . Circumferential speed of the deflector, horizontal dry grinding machine according to any of the peripheral speed is less than claims 1-6 of the stirring member. Direction of rotation of the deflector, horizontal dry grinding machine according to any one of claims 1 to 7 which is opposite of the rotational direction of the agitating member. An outer edge portion of the deflector plate is disposed at a predetermined interval with respect to the inner peripheral surface of the pulverizing tank, and is a scraping member for scraping out the fine crushed material that has adhered to or is about to adhere to the inner peripheral surface of the pulverizing tank. The horizontal dry pulverizer according to any one of claims 1 to 5 , which acts as The horizontal dry pulverizer according to claim 9 , wherein the predetermined interval is 0.2 to 0.7 mm. A fixed annular disc provided in the raw material discharge portion of the pulverization tank, and an outer peripheral portion thereof is arranged at a predetermined distance from an inner peripheral portion of the fixed annular disc inside the fixed annular disc, and is driven by the deflector rotation drive shaft. The horizontal dry pulverizer according to claim 6 , further comprising a media separator including a rotating disk adapted to be rotationally driven. The horizontal dry pulverizer according to claim 9 , wherein the predetermined interval is 1/6 to 1 / 2.5 of a diameter of a pulverizing medium to be used. A jacket is provided on the outer peripheral side of the pulverization tank so as to be spaced from the pulverization tank, and cooling water for heating the pulverization tank and the pulverization chamber or heated water flows through the jacket. The horizontal dry pulverizer according to any one of claims 1 to 12 .

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