JP4489256B2 - Crusher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulverizer, and more particularly to a media agitation type wet pulverizer effective for dispersion of ink and paint, pulverization and dispersion of ceramics, metals, inorganic substances, organic substances, magnetic substances, pigments, pharmaceuticals and the like.
[0002]
[Prior art and its problems]
There are various types of media agitation type wet pulverizers. For example, a pulverizer described in JP-A-10-230182 is generally known.
[0003]
This pulverizer is a pulverizer that efficiently pulverizes a large amount of processed material, and has a cylindrical pulverization container closed at both ends, and an inner chamber and an outer chamber provided inside the pulverization container. A cylindrical separator that is divided into two chambers, and a stirring member that is rotatably provided in the inner chamber of the crushing container.
[0004]
Then, when the stirring member is rotated and the processed material is supplied into the inner chamber of the pulverization container, the processed material is dispersed and stirred together with the pulverizing media, and is pressed in layers on the separator side by the action of centrifugal force. Rotating motion is also performed by dragging, and a strong shearing force is applied to pulverize and disperse the processed material. In this case, since the direction in which the centrifugal force acts is the same as the direction in which the processed material flows, uniform processing of the processed material is performed without difficulty.
[0005]
However, even in the pulverizer configured as described above, the efficiency of exchanging the kinetic energy of the power source for pulverization of the processed material is still low compared to various energy conversion efficiencies. .
[0006]
The present invention solves the above-mentioned problems of the conventional apparatus, and provides a pulverizer capable of remarkably improving the efficiency of exchanging kinetic energy of a power source for pulverization of a processed material. It is intended.
[0007]
[Means for solving problems]
In order to solve the above-described problems, the present invention provides a pulverization container and a pulverization container that divides the pulverization container into two chambers, an inner chamber and an outer chamber, and communicates between the two chambers. A separator having an opening; a stirring member rotatably provided in the inner chamber; a supply port for supplying a processed material into the inner chamber; and a discharge port for discharging the processed material from the outer chamber. In the pulverizer provided, the inner chamber is formed in a polygonal shape, and the stirring member includes a cylindrical portion, and the cylindrical portion is provided with a through hole penetrating inward and outward in the radial direction. A means is adopted in which the processed material and the grinding media flow from the hole to the outer peripheral side by centrifugal force . In addition, the separator has a polygonal inner peripheral surface and a plurality of rings each having a circular outer peripheral surface, and an opening communicating between the inner and outer peripheral surfaces is formed between adjacent rings. This means is adopted.
[0008]
[Action]
By adopting the above-mentioned means, the present invention rotates the stirring member and supplies the processed material from the supply port into the inner chamber of the pulverizing container. Is done. In this case, a strong shearing force is applied to the processed material and the grinding media by the rotation of the stirring member and the polygonal inner chamber. When the processed product reaches a predetermined particle size, the processed product is separated from the pulverized media by the separator, flows into the opening of the separator, flows through the separator, flows into the outer chamber, and is pulverized from the outer chamber through the discharge port. It will be discharged outside.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention shown in the drawings will be described.
1 to 5 show an embodiment of a pulverizer according to the present invention. The pulverizer 1 is a continuous media agitation type wet pulverizer, and is cylindrical with both ends closed. , A stirring member 21 rotatably provided inside the grinding container 2, and a separator 9 provided inside the grinding container 2.
[0010]
The crushing container 2 is composed of a cylindrical container body 3 with one end closed, and a disc-shaped lid 6 that closes the other end opening of the container body 3. A cylindrical boss 4 that communicates the inside and the outside of the container body 3 is integrally provided at the central portion of the closed end, and the stirring member 21 is rotatably supported by a bearing 5 that is attached to an inner portion of the boss 4. It has come to be.
[0011]
A cylindrical separator 9 is provided inside the pulverization container 2 in a state where the axis of the pulverization container 2 is substantially coincident with the axis, and the inside of the pulverization container 2 by the separator 9 is divided into an inner chamber 19 and an outer chamber 20 in the radial direction. It is designed to be partitioned into rooms.
[0012]
A cylindrical supply port 7 that communicates the inside and outside of the inner chamber 19 is integrally provided at the center of the lid 6, and ink, paint, ceramics, metal, inorganic matter, and organic matter are introduced into the inner chamber 19 through the supply port 7. In addition, processed materials such as magnetic substances, pigments and pharmaceuticals are supplied.
[0013]
The cylindrical portion of the container body 3 is integrally provided with a cylindrical discharge port 8 that communicates the inside and outside of the outer chamber 20, and passes through the opening 14 of the separator 9 from the inner chamber 19 through the discharge port 8. Then, the processed material that has flowed into the outer chamber 20 is discharged out of the pulverization container 2.
[0014]
The crushing container 2 is formed short in the axial direction. That is, it is formed so that the ratio of L (length in the axial direction) / D (diameter) is small. In this embodiment, the L / D ratio is set to L / D ≦ 1.0. When L is made small, the volume of the inner chamber 19 (grinding region) can be sufficiently secured by increasing D, and a predetermined grinding efficiency can be obtained.
[0015]
The separator 9 is formed by stacking a plurality of annular rings 11, 11... To form a cylindrical partition wall 10, and a plurality of support shafts 12 are provided on the outer peripheral side of the partition wall 10 at predetermined intervals in the circumferential direction. At this position, a plurality of annular spacers 13, 13... Are mounted on each support shaft 12, and a part of each spacer 13 is interposed between adjacent rings 11, 11. A plurality of slit-like openings 14 communicating between the inner and outer peripheral surfaces of the partition wall 10 are formed therebetween.
[0016]
The shape of the opening 14 of the separator 9 is not limited to the slit shape, and may be any other shape. Here, the reason why the opening 14 of the separator 9 is slit-shaped is that the dimension of the slit-shaped opening 14 can be arbitrarily changed by changing the thickness of the spacer 13, and the viscosity and granularity of the processed material This is because the thickness of the spacer 13 can be set appropriately depending on the properties and other processing conditions.
[0017]
Each ring 11 of the separator 9 has an annular shape with a square cross section (in this embodiment, the cross section is a quadrilateral shape, but is not limited thereto), and an inner peripheral surface is a polygonal shape ( In this embodiment, it is formed in a regular octagonal shape, but is not limited to this, and the outer peripheral surface is formed in a circular shape.
[0018]
A plurality of rings 11 having such a shape are overlapped so that each vertex angle of the inner peripheral surface of each ring 11 is located on the same vertical line, so that the inner peripheral surface is a polygonal shape and the outer peripheral surface is a circle. The shape partition 10 can be comprised.
[0019]
Annular ring retainers 15 and 16 are positioned at the upper and lower portions of the partition wall 10, respectively, and the upper end of each support shaft 12 is fitted to the upper ring retainer 15 and bolts 18 are inserted through the lower ring retainers 16. Each ring 11 and each spacer 13 can be brought into close contact with each other by being screwed into the lower end portion of each support shaft 12 and tightened with a predetermined torque, and a unitized separator 9 can be configured. is there.
[0020]
The unitized separator 9 can be integrally attached to and detached from the crushing container 2, and is supported between the inner surface of the lid 6 and the bottom surface of the container body 3 when mounted in the crushing container 2. 2 is held at a predetermined position.
[0021]
By mounting the separator 9 having the above-described configuration in the pulverization container 2, the pulverization container 2 is partitioned into two chambers, an inner chamber 19 and an outer chamber 20, in the radial direction. 20 to communicate with each other through the openings 14 of the separator 9, and the processed material in the inner chamber 19 can flow into the outer chamber 20 through the openings 14 of the separator 9. is there. In this case, the inner chamber 19 has a polygonal outer peripheral portion formed by the polygonal inner peripheral surface of the partition wall of the separator 9, and the outer chamber 20 has a circular inner peripheral portion formed by the circular outer peripheral surface of the separator 9. Is formed.
[0022]
The stirring member 21 has a cylindrical shape with one end closed, and is rotatably provided in the inner chamber 19 of the crushing container 2. On the outer peripheral side of the cylindrical portion of the stirring member 21, concave portions 22 and convex portions 23 are alternately provided over the entire circumference. Each recess 22 is provided with a through hole 24 penetrating inward and outward, and the processed material and the pulverization medium flow between the inner and outer portions of the stirring member 21 in the radial direction via the through hole 24. .
[0023]
A plurality of through-holes 25 are provided at one end of the agitating member 21 which is closed to penetrate the stirring member 21 inward and outward. The through-holes 25 are located at a predetermined interval on a substantially concentric circle centered on the axis of the stirring member 21, and the processed material and the pulverization medium are passed between the inner and outer sides in the axial direction of the stirring member 21 through the through-hole 25. They are designed to flow with each other.
[0024]
A cylindrical protrusion 26 is integrally provided at the central portion of the closed end of the stirring member 21. The outer peripheral side of the protrusion 26 is fitted to the inner peripheral side of the bearing 5 mounted in the boss 4 of the container body 3 and is rotatably supported by the bearing 5. A front end portion of a drive shaft 27 that is rotatably supported by the bearing 5 is fitted to the inner peripheral side of the protrusion 26. The stirring member 21 is integrally connected to the drive shaft 27 by screwing a dispersion member 28 that also serves as a lock nut from the inner surface side of the stirring member 21 to the tip of the drive shaft 27 and tightening with a predetermined torque. It is like that.
[0025]
Concave portions 29 and convex portions 30 are alternately provided over the entire circumference of the head of the dispersion member 28, and the concave portions 29 and convex portions 30 are supplied into the inner chamber 19 of the pulverization container 2 from the supply port 7. The processed material and the pulverization media located in the inner chamber 19 are dispersed outward in the radial direction.
[0026]
The peripheral speed of the stirring member 21 is usually 8 m / s to 16 m / s. The larger the peripheral speed, the better the crushing efficiency, but a larger power is required. Accordingly, since the optimum peripheral speed varies depending on the degree of pulverization or the processed material, it is necessary to select the optimum peripheral speed depending on the processing conditions.
[0027]
The residence time of the processed product is 1 to 30 seconds / pass. It is better to process the residence time in a shorter time, but it is necessary to select an optimum residence time according to the processing conditions similar to the peripheral speed.
[0028]
The grinding media include zirconia beads, steel beads, ceramic beads, glass beads, and the like, and the media diameter is 0.1 mm to 2 mm. The filling amount is 20 to 60% in the pulverization container 2. The smaller the pulverization media and the larger the filling amount, the finer the pulverization is possible. However, the degree of pulverization, the shape and properties of the processed product differ depending on the application, and the optimal media for the application and processed product. It is necessary to select. Further, the same selection is necessary for the material.
[0029]
Next, the operation of the above will be described. First, when a drive source (not shown) is operated to rotate the drive shaft 27, the stirring member 21 connected to the drive shaft 27 rotates integrally with the drive shaft 27 and is positioned at the center of the stirring member 21. The dispersing member 28 also rotates integrally with the stirring member 21.
[0030]
Then, when the processed product is supplied from the supply port 7 to the inside of the inner chamber 19 of the pulverization container 2, the processed product is dispersed radially outward together with the pulverized media by the dispersing member 28 and stirred by the stirring member 21. .
[0031]
In this case, since the cylindrical portion of the stirring member 21 is provided with a through hole 24 penetrating inward and outward in the radial direction, a strong centrifugal force acts on the processed material and the pulverization medium by the through hole 24, and the treatment is performed. The object and the grinding media flow from the through hole 24 to the outer peripheral side of the stirring member 21.
[0032]
Then, the processed material and the pulverization medium that have flowed to the outer peripheral side of the stirring member 21 are formed on the outer peripheral side of the stirring member 21, such as the concave portion 22, the convex portion 23, and the polygonal outer peripheral portion (separator 9) of the inner chamber 19. A powerful shearing force is applied by the inner peripheral surface of the stirring member 21 and flows in one end direction or the other end direction in the axial direction of the stirring member 21, and the stirring member 21 moves through the gap between the lid 6 and the stirring member 21. Flows inward. Further, a part flows through the gap between the agitating member 21 and the container body 3 from the through hole 25 in the closed portion of the agitating member 21 to the inside of the agitating member 21, and along such a series of flows. Thus, the inside of the inner chamber 19 is circulated.
[0033]
Then, the processed material and the pulverizing medium circulate inside the inner chamber 19 as described above, so that both are in a completely mixed state, and the processed material is gradually finely pulverized to reach a predetermined particle size.
[0034]
The processed product that has reached a predetermined particle size is separated from the pulverized media by the separator 9 when flowing to the outer peripheral side of the stirring member 21, flows into the slit-like opening 14 of the separator 9, flows there, and flows outside. It reaches the inside of the chamber 20 and is discharged from the outer chamber 20 to the outside of the crushing container 2 through the discharge port 8.
[0035]
In the pulverizer 1 according to this embodiment configured as described above, the L / D ratio of the pulverization container 2 is reduced (less than 1.0), and D is increased by the amount L is reduced. Therefore, a sufficient volume of the inner chamber 19 (grinding region) can be secured and a strong centrifugal force can be obtained.
[0036]
In addition, the separator 9 that separates the processed material and the pulverized media is formed into a unit by forming a plurality of slit-shaped openings 14 by combining a plurality of rings 11, a plurality of spacers 13, and a plurality of support shafts 12. Since the unitized separator 9 is provided inside the pulverization container 2 with the axes substantially coincided with each other, a sufficient effective area for processing a large flow rate of processed material can be secured. Therefore, the flow of the processed material is not limited by the separator 9 and can sufficiently handle the processing of a large flow rate of processed material.
[0037]
Further, the dispersion member 28 is provided in the central portion of the stirring member 21, the through-hole 24 that penetrates the inside and outside in the radial direction in the cylindrical portion of the stirring member 21, and the inner and outer sides in the axial direction at the closed end of the stirring member 21. Since the through holes 25 penetrating each other are provided, the processing object and the grinding media can be circulated using the entire inner chamber 19. Therefore, the pulverization media and the processed material are not shifted to a part inside the pulverization container 2 to affect the operation or the operation becomes difficult, and good operation characteristics can be obtained in the long term. become.
[0038]
Further, the grinding media revolves and rotates along the inner peripheral surface of the separator 9 located on the outer peripheral portion of the inner chamber 19. In this case, since the inner peripheral surface of the separator 9 is formed in a polygonal shape, The revolving direction of the grinding media revolving along the inner peripheral surface 9 always changes, and the rotation of the grinding media increases with the change. Therefore, the change in the revolution direction of the grinding media and the increase in the number of rotations can amplify the shearing action on the processed material, and can significantly improve the grinding efficiency of the processed material.
[0039]
In the above description, the plurality of rings 11 constituting the partition wall 10 of the separator 9 have the same shape (regular octagonal shape), and the vertical angles of the inner peripheral surfaces of the rings 11 are on the same vertical line. A plurality of rings 11 are overlapped so as to be positioned to form an inner chamber 19 having an outer octagonal shape on the inner peripheral side of the separator 9, but the apex angle of the inner peripheral surface of each ring 11 is shifted in the circumferential direction. In this manner, the plurality of rings 11 may be overlapped to form the inner chamber 19 having an inner peripheral surface spirally formed on the inner peripheral side of the separator 9. In that case, since each vertex angle of the inner peripheral surface of each ring 11 is located at a position shifted from the same vertical line, the number of apex angles constituting the inner peripheral surface of the inner chamber 19 increases. is there. That is, the inner chamber 19 has the same number of apex angles as the total number of apex angles of the inner peripheral surfaces of the plurality of rings, and has a complicated shape. Further, although not shown, a plurality of rings having different inner peripheral surface shapes may be overlapped to increase the number of apex angles of the inner peripheral surface of the inner chamber 19 and the inner chamber 19 may have a complicated shape. Even when it is difficult to say that such a polygonal shape is used, a strong shearing force can be applied to the processed material by having an angle on the inner peripheral surface of the ring.
[0040]
FIG. 6 shows a batch processing system 31 configured using the pulverizer 1 according to the present invention. That is, the batch processing system 31 includes the pulverizer 1 described above, a service tank 33 connected to the pulverizer 1 via a circulation line 32, and a circulation pump 34 provided in the middle of the circulation line 32. Yes.
[0041]
This batch processing system 31 is effective when sufficient pulverization cannot be performed by one pulverization, and is particularly effective when a small amount of various products are produced. In this case, many service tanks 33 that can be moved are used, and these can be used by sequentially exchanging them. Further, when it is necessary to clean the inside of the pulverizer 1 by switching the product, the service tank 33 containing a cleaning liquid such as a detergent or a rinsing liquid is connected and operated so that the inside of the pulverizer 1 is pulverized. The media, the circulation line 32, etc. can be completely cleaned.
[0042]
Below, the Example of the grinder by this invention is described.
In this example, a comparison test between a separator using a regular octagonal ring and a separator using a circular ring was performed in the batch processing system 31 described above. The processed material was sampled at the holding tank entrance of the circulation route. The particle size was measured by laser diffraction and light scattering method using Microtrack MKIIDRA manufactured by Nikkiso Co., Ltd. FIG. 7 shows a comparison between a separator using a regular octagonal ring and a separator using a circular ring.
The processing conditions were as follows.
Crusher motor capacity: 15 kW, rotation speed: 1200 rpm, processing flow rate: 15 l / min
Crushing container: inner diameter (D) 230 mm, axial length (L) 86 mm, container capacity 2.7 l
Stirring member: inner diameter 220 mm, axial length 70 mm
Grinding media material: zirconia, ball diameter: 0.3 mm
Processed calcium carbonate 10kg and water 10kg
Average particle size of calcium carbonate: 5.5 μm
Under the above processing conditions, the power consumption required to pulverize the average particle size of the processed product to 1 μm was measured for each usage amount of the pulverizing media. The result is shown in FIG. From this result, it was found that the separator using the polygonal ring has the following advantages compared to the separator using the circular ring.
If the power consumption is the same, a smaller amount of grinding media is sufficient.
For the same amount of grinding media, the power consumption is small.
In both the circular ring and the polygonal ring, the larger the amount of grinding media, the smaller the power consumption. However, the decrease rate of the power consumption with respect to the increase in the media amount is significantly higher in the polygonal ring than in the circular ring. The greater the media amount, the greater the difference between the power consumption of the circular ring and the polygon ring.
From the above, it was proved that a separator with a polygonal ring can be efficiently pulverized with less pulverizing media.
[0043]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
That is, when the processed material is supplied from the supply port into the inner chamber of the pulverization container and the stirring member is rotated, the processed material is stirred and pulverized together with the pulverization medium located inside the inner chamber. In this case, the grinding media revolves and rotates along the inner peripheral surface of the separator located at the outer peripheral portion of the inner chamber. In this case, the inner peripheral surface of the separator is formed in a polygonal shape, The revolving direction of the grinding media revolving along the surface always changes, and the rotation of the grinding media increases with the change. Therefore, the change in the revolution direction of the grinding media and the increase in the number of rotations amplify the shearing action on the processed material, and the grinding efficiency is improved.
Furthermore, since the inner peripheral surface of the separator has a polygonal shape, the pulverization efficiency is also improved by a shearing action caused by a change in the rotation direction of the processed product itself. Thus, by forming the inner peripheral part of the separator into a polygonal shape, a synergistic effect is produced, and the shearing action acting on the processed material is remarkably increased, which contributes to further improvement of the grinding efficiency.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of a crusher according to the present invention.
FIG. 2 is an enlarged view of a main part of what is shown in FIG.
FIG. 3 is a detailed view of a separator.
4 is a cross-sectional view taken along line AA in FIG.
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is a system diagram of a batch processing system configured using a pulverizer according to the present invention.
FIG. 7 is an explanatory diagram comparing the performance of a pulverizer according to the present invention and a conventional pulverizer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Crusher 2 ... Crushing container 3 ... Container body 4 ... Boss 5 ... Bearing 6 ... Lid 7 ... Supply port 8 ... Discharge port 9 ... Separator 10 ... Septum 11 ... Ring 12 ...... Support shaft 13 ...... Spacer 14 ...... Opening portions 15 and 16 ...... Rings retainer 18 ...... Bolt 19 ...... Inner chamber 20 ...... Outer chamber 21 ...... Agitating members 22 and 29 ...... Recesses 23 and 30 ...... Convex parts 24, 25 ... Through hole 26 ... Projection part 27 ... Drive shaft 28 ... Dispersing member 31 ... Batch processing system 32 ... Circulation line 33 ... Service tank 34 ... Circulation pump

Claims (2)

A crushing container, a crushing container provided in the crushing container to divide the crushing container into two chambers, an inner chamber and an outer chamber, and provided with a separator having an opening communicating between both chambers, and rotatably provided in the inner chamber. A pulverizer comprising a stirring member, a supply port for supplying a processed material into the inner chamber, and a discharge port for discharging the processed material from the outer chamber,
The inner chamber is formed in a polygonal shape ,
The stirring member includes a cylindrical portion, and the cylindrical portion is provided with a through-hole penetrating the inside and outside in the radial direction, and the processed material and the grinding media flow from the through-hole to the outer peripheral side by centrifugal force. Characteristic crusher.   The separator has an inner peripheral surface formed in a polygonal shape, and a plurality of rings each having an outer peripheral surface formed in a circular shape are overlapped, and an opening communicating between the inner and outer peripheral surfaces is formed between adjacent rings. The pulverizer according to claim 1.

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