JP7276796B2 - Media agitating pulverizer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a media agitating pulverizer. The media agitating pulverizer of the present invention can be used for alumina, zirconia, aluminum nitride, PZT, barium titanate, other ceramics, silicon nitride, silicon carbide, dielectric materials, magnetic materials, iron oxide, ferrite, silica, battery materials, carbon, It is particularly suitable for, but not limited to, use for grinding raw materials such as magnesium oxide, calcium carbonate, inorganic pigments, organic pigments, and other ground materials into fine particles.

Conventionally, as a media agitating pulverizer, one described in Japanese Utility Model Laid-Open No. 3-26351 is known.
The media stirring type pulverizer and the like described in this publication include a pulverizing tank having a cylindrical pulverizing chamber, a raw material supply unit provided at one end of the pulverizing tank, and a raw material provided at the other end of the pulverizing tank. a discharge section, a grinding media placed in the grinding chamber, a rotary drive shaft extending into the grinding chamber of the grinding tank, disposed in the grinding chamber and attached to the rotary drive shaft at a distance from each other, the A plurality of agitation discs that are rotationally driven by a rotary drive shaft to stir and grind the raw material supplied from the raw material supply unit and the raw material together with the grinding media from the raw material supply unit to the raw material discharge unit while continuously conveying the raw material. It is of structure.

However, since the grinding media are mainly moved by the action of the shearing force between the discs and the shearing force between the wall of the grinding chamber and the discs, the energy efficiency is poor. There was a problem that so-called short pass, which flows to the outlet side through between the outer circumference of the disk and the inner circumference of the pulverizing tank, is likely to occur.
In order to prevent the occurrence of the short pass, there is a conventional one in which an opening is provided in the stirring disk, but this is not sufficient.

Japanese Utility Model Laid-Open No. 3-26351

Therefore, the present invention provides a media agitating pulverizer that has good energy efficiency of the agitation disk even when using the disk-shaped agitating member as described above, and that can prevent the occurrence of short passes as much as possible. intended to

The above objects are achieved by a media-stirring pulverizer of the present invention having the following configurations (1) to ( 6 ).
(1)
A grinding tank having a cylindrical grinding chamber, a raw material supply section provided at one end of the grinding tank, a raw material discharge section provided at the other end of the grinding tank, and grinding media placed in the grinding chamber. a rotary drive shaft extending into the crushing chamber of the crushing tank; a rotary drive shaft disposed in the crushing chamber and attached to the rotary drive shaft at a distance from each other; driven to rotate by the rotary drive shaft; A media agitating pulverizer comprising a plurality of agitating disks for agitating and pulverizing the supplied slurry-like raw material together with the pulverizing media while continuously conveying the raw material from the raw material supply unit toward the raw material discharge unit ,
In at least one of the spaces between the plurality of agitating disks , the rotary drive is provided to diffuse the mixed slurry of the raw material and the grinding media continuously moving from the raw material supply section toward the raw material discharge section . A plate-shaped diffusing member extending in the axial direction is provided, and a constricted flow forming passage for diffusion is constituted by a gap between both sides of the diffusing member and the agitating disk or by openings provided in the diffusing member itself . In the media agitating pulverizer,
The flow contraction forming passage is formed by a gap between the stirring disk and the diffusion member, and the width of the gap is more than 3 times and 10 times or less the diameter of the grinding media used, and
The contracted flow forming passage is formed by the opening provided in the diffusion member itself, and the shape of the opening is circular, and the diameter thereof is more than 5 times and not more than 20 times the diameter of the grinding media used.
A media stirring pulverizer characterized by:
(2)
A grinding tank having a cylindrical grinding chamber, a raw material supply section provided at one end of the grinding tank, a raw material discharge section provided at the other end of the grinding tank, and grinding media placed in the grinding chamber. a rotary drive shaft extending into the crushing chamber of the crushing tank; a rotary drive shaft disposed in the crushing chamber and attached to the rotary drive shaft at a distance from each other; driven to rotate by the rotary drive shaft; A media agitating pulverizer comprising a plurality of agitating disks for agitating and pulverizing the supplied slurry-like raw material together with the pulverizing media while continuously conveying the raw material from the raw material supply unit toward the raw material discharge unit,
In at least one of the spaces between the plurality of agitating disks, the rotary drive is provided to diffuse the mixed slurry of the raw material and the grinding media continuously moving from the raw material supply section toward the raw material discharge section . A plate-shaped diffusing member extending in the axial direction is provided, and a constricted flow forming passage for diffusion is constituted by a gap between both sides of the diffusing member and the agitating disk or by openings provided in the diffusing member itself. In the media agitating pulverizer,
The contracted flow forming passage is formed by a gap between the stirring disk and the diffusion member, and the width of the gap is more than 3 times and 10 times or less the diameter of the grinding media used, and
The formation position of the opening is the center of the diffusion member.
A media stirring pulverizer characterized by:
( 3 )
The media agitating pulverizer according to (1) or (2), wherein the plate-like diffusion member is twisted into a lead screw shape.
( 4 )
The media agitation pulverizer according to ( 3) above, wherein the plate-shaped diffusion member is twisted into a lead screw and formed with a twist angle of 60 degrees or less.
( 5 )
The diffusing members are provided in every other space, and the space in which no diffusing member is provided serves as a space for diverging contraction. Any media agitating grinder.
( 6 )
The media agitating pulverizer according to any one of (1) to ( 5 ), which is horizontal.

In the media agitation type pulverizer of the present invention, the gap between both sides of the diffusion member and the agitation member or the opening provided in the diffusion member itself constitutes the constricted flow forming passage for diffusion. , the flow of the raw material slurry from the outside to the center and from the center to the outside in the grinding tank is promoted, so that the short pass can be well prevented, and this flow also improves the distribution of the grinding media in the raw material slurry. It is homogenized and allows good grindability. Therefore, energy efficiency is improved.
In addition, even if a large flow rate is applied, segregation of the grinding media toward the raw material discharge part is prevented as much as possible by the above flow, so a large flow rate can be processed and a one-pass mill can be realized.

1 is a longitudinal cross-sectional view showing a horizontal media stirring pulverizer according to an embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view of a stirring mechanism used in the horizontal media stirring pulverizer shown in FIG. 1; FIG. 2 is an enlarged view of a part of a stirring mechanism used in the horizontal media stirring pulverizer shown in FIG. 1; FIG. 2 is an enlarged view of a part of a modification of the stirring mechanism used in the horizontal media stirring pulverizer shown in FIG. 1. FIG. FIG. 2 is an enlarged view of part of another modification of the stirring mechanism used in the horizontal media stirring pulverizer shown in FIG. 1. FIG.

DETAILED DESCRIPTION OF THE INVENTION A horizontal media agitating pulverizer according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows a horizontal media agitating pulverizer 10 according to an embodiment of the present invention. This horizontal media agitating pulverizer 10 has a horizontal cylindrical pulverizing tank 14 having a pulverizing chamber 12 therein. are doing. The pulverizing tank 14 is preferably made of ceramic such as alumina, alumina zirconia and silicon nitride, which are heat-resistant materials. One end of this crushing tank 14 (upstream side in the flow of raw materials-hereinafter, for all members and parts, this side is referred to as one end) is a casing 16, and the other end (downstream side in the flow of raw materials-hereinafter, all members , this side of the part is referred to as the other end) is attached with a media separating member (separator) 18 and a product discharge section 100 for discharging the pulverized product. At one end of the pulverization tank 14, a material injection nozzle 22, which is a material injection section, is provided as shown. The structure of the media separating member (separator) 18 is not particularly limited, and for example, it may be a tubular member 19 as shown in the figure provided with a plurality of slits or holes 19a.

Inside the pulverization tank 14, a rotary drive shaft 24 extends horizontally from the casing 16 toward the other end side (product discharge section 100 side). The rotary drive shaft 24 is arranged coaxially with the crushing tank 14 . In the pulverizing chamber 12, a plurality of stirring discs (hereinafter simply referred to as "disc ) 30 are axially spaced apart. The stirring disk 30 is preferably made of ceramic such as zirconia, silicon nitride and alumina, which are wear-resistant materials. The disk 30 is formed with at least one communication hole 40 for the distribution of raw material slurry for the purpose described later.
Inside the grinding chamber 12, grinding media M are accommodated. The grinding media M are granular with a diameter of about 0.2 to 2 mm. It is preferable that the filling is about 50 to 80%.

The rotary drive shaft 24 is rotatably supported in the casing 16 by bearings, connected to a drive motor as a drive source via a well-known drive mechanism (belt and pulley), and driven to rotate.

A jacket 54 is provided on the outer peripheral side of the pulverizing tank 14 at an interval from the pulverizing tank 14. Cooling water for cooling the pulverizing tank and the pulverizing chamber flows through the jacket 54. there is In the figure, reference numeral 56 indicates a cooling water inlet nozzle, and reference numeral 58 indicates a cooling water outlet nozzle.

The product discharge section 100 is provided with a discharge pipe for discharging the obtained product to the outside of the crusher, and an automatic valve as an opening/closing mechanism for the discharge pipe is provided in the middle of the discharge pipe. ing.

Although not shown, a raw material supply pump connected to a tank, which is a raw material feeder, is connected above the raw material injection nozzle 22 to supply the raw material to the raw material injection nozzle 22 .

The raw material supply pump is normally continuously driven by a drive motor. The amount of raw material supplied by the raw material supply pump can be adjusted by controlling the drive motor.

In the agitation mechanism 28 of the horizontal media agitating pulverizer 10 of the present invention, the material supply section to the material discharge section are arranged in the space 31a of the plurality of space spaces 31 between the two agitation discs 30 every other space 31a. A plate-shaped diffusing member 50 extending in the axial direction is provided in order to diffuse the mixed slurry of the raw material and the grinding media continuously moving toward . Spaces 31a that are alternately spaced among the plurality of spaced spaces 31 are used as reflux forming spaces 31b. The diffusion member 50 and the agitating disc 30 are removably attached to the rotary drive shaft 24 by a sleeve 60 .

As can be seen from FIG. 3, gaps 32 are provided between both sides of the diffusing member 50 and the stirring disk 30, and the gaps 32 cause the raw material slurry to contract. The width of this gap 32 is preferably more than three times and not more than ten times the diameter of the grinding media M used. If the width of the gap 32 is less than the above range, the gap 32 may be clogged with the pulverizing media M.
The raw material slurry is contracted when passing through the gap 32, and the contracted raw material slurry is expanded after passing through the gap 32. At this time, as shown in FIG. Flows f1 and f2 from one end of the pulverization tank 14 to the other end and in the opposite direction, that is, reflux is generated from the gap 31a through the reflux forming space 31b and the communication hole 40 and returning to the original gap 31a. . Due to this reflux, the distribution of the raw material in the grinding chamber becomes uniform, and uniform grinding is performed. In particular, this reflux imparts a large kinetic energy to the grinding media, increases the probability of contact between the grinding media, increases the grinding capacity, and prevents the segregation of the grinding media on the outlet side of the grinding chamber 12. be.

The effect of the gap 32 described above can also be achieved by one or more contraction openings 34 provided in the plate-like diffusion member 50 itself, as shown in FIG.
The openings 34 are preferably circular and preferably have a diameter greater than 5 times and no more than 20 times the diameter of the grinding media used. When one opening is formed, the formation position is preferably substantially in the center of the diffusing member.

Furthermore, as shown in FIG. 5, the plate-like diffusing member 50 is twisted into a lead screw shape, and this twist acts against the flow of the mixed slurry from the raw material supply section to the product discharge section. It is preferable to have a structure in which a thrust force acts in the opposite direction, that is , in the direction toward the raw material supply section . This twist angle is preferably 60 degrees or less, particularly 45 degrees or less.

Although the horizontal media agitating pulverizer has been described above, the present invention can also be applied to a vertical pulverizer.

As described above, according to the media stirring type pulverizer of the present invention, the distribution of the raw material in the pulverization chamber becomes uniform due to the above-mentioned reflux, and uniform pulverization is performed. In particular, this reflux imparts a large kinetic energy to the grinding media, increases the probability of contact between the grinding media, increases the grinding capacity, and prevents the segregation of the grinding media on the outlet side of the grinding chamber 12. be.
Therefore, a one-pass grinder can be realized. Also in this one-pass pulverizer, segregation of the pulverizing media on the exit side, ie, the media separation member, as described above, is prevented, and wear of the media separation member is thus prevented.

REFERENCE SIGNS LIST 10 horizontal media agitating pulverizer 12 pulverizing chamber 14 pulverizing tank 16 casing 18 media separation member 19 cylindrical member 19a slits and holes 22 raw material input nozzle 24 rotary drive shaft 26 mechanical seal cover 28 agitating mechanism 30 agitating disk 31 space 31a Interval Space 31b Circulation Forming Space 32 Gap 34 Flow Constriction Opening 40 Communication Hole 50 Diffusion Member 54 Jacket 60 Sleeve 100 Product Discharge Portion

Claims (6)

A grinding tank having a cylindrical grinding chamber, a raw material supply section provided at one end of the grinding tank, a raw material discharge section provided at the other end of the grinding tank, and grinding media placed in the grinding chamber. a rotary drive shaft extending into the crushing chamber of the crushing tank; a rotary drive shaft disposed in the crushing chamber and attached to the rotary drive shaft at a distance from each other; driven to rotate by the rotary drive shaft; A media agitating pulverizer comprising a plurality of agitating disks for agitating and pulverizing the supplied slurry-like raw material together with the pulverizing media while continuously conveying the raw material from the raw material supply unit toward the raw material discharge unit ,
In at least one of the spaces between the plurality of agitating disks , the rotary drive is provided to diffuse the mixed slurry of the raw material and the grinding media continuously moving from the raw material supply section toward the raw material discharge section . A plate-shaped diffusing member extending in the axial direction is provided, and a constricted flow forming passage for diffusion is constituted by a gap between both sides of the diffusing member and the agitating disk or by openings provided in the diffusing member itself . In the media agitating pulverizer,
The flow contraction forming passage is formed by a gap between the stirring disk and the diffusion member, and the width of the gap is more than 3 times and 10 times or less the diameter of the grinding media used, and
The contracted flow forming passage is formed by the opening provided in the diffusion member itself, and the shape of the opening is circular, and the diameter thereof is more than 5 times and not more than 20 times the diameter of the grinding media used.
A media stirring pulverizer characterized by: A grinding tank having a cylindrical grinding chamber, a raw material supply section provided at one end of the grinding tank, a raw material discharge section provided at the other end of the grinding tank, and grinding media placed in the grinding chamber. a rotary drive shaft extending into the crushing chamber of the crushing tank; a rotary drive shaft disposed in the crushing chamber and attached to the rotary drive shaft at a distance from each other; driven to rotate by the rotary drive shaft; A media agitating pulverizer comprising a plurality of agitating disks for agitating and pulverizing the supplied slurry-like raw material together with the pulverizing media while continuously conveying the raw material from the raw material supply unit toward the raw material discharge unit,
In at least one of the spaces between the plurality of agitating disks, the rotary drive is provided to diffuse the mixed slurry of the raw material and the grinding media continuously moving from the raw material supply section toward the raw material discharge section. A plate-shaped diffusing member extending in the axial direction is provided, and a constricted flow forming passage for diffusion is constituted by a gap between both sides of the diffusing member and the agitating disk or by openings provided in the diffusing member itself. In the media agitating pulverizer,
The flow contraction forming passage is formed by a gap between the stirring disk and the diffusion member, and the width of the gap is more than 3 times and 10 times or less the diameter of the grinding media used, and
The formation position of the opening is the center of the diffusion member.
A media stirring pulverizer characterized by: 3. The media agitating pulverizer according to claim 1, wherein said plate-like diffusion member is twisted into a lead screw shape. 4. The media agitating pulverizer according to claim 3 , wherein the plate-like diffusion member is twisted into a lead screw shape and has a torsion angle of 60 degrees or less. 5. The diffusing member according to any one of claims 1 to 4 , wherein the diffusing member is provided in every other interval space, and the interval space in which the diffusing member is not provided is a space for expanding contraction. Media agitating pulverizer. 6. The media agitating pulverizer according to any one of claims 1 to 5 , which is of horizontal type.

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