JP2008238002A - Wet crusher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wet crusher for improving crushing efficiency and yield and accelerating atomization. <P>SOLUTION: The wet crusher 1 comprises a mill chamber 10, a partitioning part 30 for sectioning space in the mill chamber 10 into the space of an upper mill chamber 12a and the space of a lower mill chamber 12b, and an agitating mechanism part 20 for agitating and crushing an object to be treated together with a crushing medium 50a introduced to the upper mill chamber 12a and a crushing medium 50b introduced to the lower mill chamber 12b. The partitioning part 30 is provided with a plurality of through-holes 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wet pulverizer.

The wet pulverizer is widely used because it disperses the pulverized material to be pulverized in a dispersion medium such as water and grinds it using a pulverizing medium or the like. Further, in the field of wet pulverizers, various methods have been proposed in order to improve the pulverization efficiency. In the wet pulverizer described in Patent Document 1, two or more circulating means are used as one method. The method of providing is adopted.
JP-A-6-254423

  However, the wet pulverizer described in Patent Document 1 performs pulverization with one type of pulverization medium in one mill chamber. Generally, the final particle size of the workpiece is determined by the size of the crushing media. Therefore, in the wet pulverizer described in Patent Document 1, it is necessary to perform batch processing by providing a plurality of mill chambers having pulverized media of smaller size in order to achieve atomization. However, in such batch processing, coarse particles are likely to remain in the mill chamber, and the pulverization efficiency and yield are reduced.

  An object of the present invention is to provide a wet pulverizer capable of improving pulverization efficiency and yield and promoting atomization.

  In order to solve the above problems, a wet pulverizer according to the present invention includes a cylindrical mill chamber, a partition that is disposed inside the mill chamber, and divides the space inside the mill chamber into a plurality of spaces in the vertical direction, and a plurality of And a stirring means for stirring and pulverizing the workpiece introduced into the space together with the pulverizing medium, and the partition portion is provided with a plurality of through holes.

  In the wet pulverizer according to the present invention, the space inside the mill chamber is divided into a plurality of spaces in the vertical direction by disposing a partition portion provided with a plurality of through holes inside the cylindrical mill chamber. The workpiece to be crushed in the upper space directly flows into the lower space, and the pulverization process is continuously performed. Thereby, it becomes possible to atomize the workpiece. Moreover, compared with the conventional batch process which passes a to-be-processed object through several mill chambers, a grinding | pulverization efficiency and a yield can be improved.

  Preferably, the stirring means has a rotating shaft, a drive motor that rotates the rotating shaft, and an agitating arm provided on the rotating shaft. As a result, when the rotating shaft is rotated by the drive motor, the stirring arm provided on the rotating shaft is also rotated, and centrifugal force is applied to the grinding media and the object to be ground by the rotational motion of the stirring arm. As a result, it becomes possible for the grinding media to stir and grind the workpiece.

  More preferably, a plurality of through holes are provided from the inside to the outside of the partition part, and a diameter of the through hole provided outside the partition part among the plurality of through holes is provided inside the partition part. It is larger than the diameter of the through hole. In this case, it is possible to easily flow out the coarse particles in the object to be processed, which are largely subjected to the centrifugal force due to the rotation and sent out to the outside of the partition portion, into the lower space.

  Preferably, the plurality of through holes are provided from the inside to the outside of the partition part, and the diameter of the through hole provided inside the partition part among the plurality of through holes is provided on the outside of the partition part. It is larger than the diameter of the through hole. When the stirring arm rotates, the dispersion medium in the mill chamber moves in the direction of the centrifugal force, i.e., from the inside to the outside in the mill chamber, and the direction opposite to the direction of the centrifugal force, i.e., from the outside in the mill chamber. An inward flow is generated and circulates in the mill chamber. Therefore, since the diameter of the through hole provided inside the partition portion is larger than the diameter of the through hole provided outside the partition portion, the flow in the direction opposite to the acting direction of the centrifugal force causes the flow from the outside in the mill chamber. Coarse particles in the workpiece transferred to the inside can be easily discharged to the lower space.

  Preferably, the plurality of through holes are not provided in the outer edge portion of the partition portion. Due to the centrifugal force generated by the rotation of the stirring arm, the object to be processed and the pulverization medium are relatively likely to stay outside the mill chamber. Therefore, by not providing a through-hole in the outer edge portion of the partition part, it is possible to ensure a period in which the object to be processed and the pulverization medium stay together, and to efficiently pulverize the object to be processed.

  Preferably, the partition is a punching metal. Here, the punching metal means a metal plate punched to form a plurality of small holes. Thereby, a partition part can be manufactured easily.

  Preferably, there is further provided a shutter part that is located above the partition part and that can be opened and closed. During the pulverization process, the shutter part is closed and the pulverization process is performed in a sealed state. After the pulverization process, the shutter part is opened and the workpieces are discharged into the space below, allowing batch processing in one mill chamber. The same effect as the processing can be obtained. Furthermore, it is possible to control the outflow timing and the outflow amount by adjusting the degree of opening and closing.

  Preferably, a plurality of partition parts are arranged in the vertical direction, and in the plurality of arranged partition parts, a plurality of through holes provided in the partition part located on the lower side of the two partition parts adjacent in the vertical direction. The diameter is smaller than the diameter of the through hole provided in the partition located on the upper side. In this case, it is possible to obtain an object to be processed that is successively pulverized in a plurality of spaces partitioned by a plurality of partition portions and finally atomized to a desired level.

  According to the present invention, it is possible to provide a wet pulverizer that improves pulverization efficiency and yield and promotes atomization.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same elements or elements having the same function are denoted by the same reference numerals, and redundant description is omitted.

  First, the configuration of the wet pulverizer according to the present embodiment will be described with reference to FIGS. As shown in FIG. 1, the wet pulverizer 1 includes a cylindrical mill chamber 10, a stirring mechanism unit 20 as a stirring unit, a partition unit 30, a shutter unit 40, a pulverizing medium 50 a, a pulverizing medium 50 b, and a discharge unit 60. I have. FIG. 1 is a side view of a wet pulverizer according to the present embodiment. FIG. 2 is a cross-sectional view taken along the line II of FIG. 1 when the shutter unit 40 is in the closed state. FIG. 3 is a cross-sectional view taken along the line II of FIG. 1 when the shutter unit 40 is in the open state. FIG. 4 is a plan view of the partition portion 30.

  The mill chamber 10 has a mill chamber body 12 and a mill chamber lid 14. The mill chamber main body 12 has a bottomed cylindrical shape, and has an annular shape with a cross section having an outer diameter and an inner diameter. The mill chamber body 12 is open at the upper end. The mill chamber lid portion 14 has a disk shape and closes the upper end portion of the mill chamber main body portion 12. The mill chamber lid portion 14 has a hole portion through which a rotation shaft 22 (described later) passes in the center portion thereof. A discharge portion 60 described later is provided at the center of the bottom surface of the mill chamber body 12. The mill chamber 10, especially the mill chamber main body 12, is made of, for example, alumina, alumina zirconia, ceramic having good thermal conductivity, or the like. By using these wear-resistant members, it is possible to prevent impurities from entering the object to be processed.

  On the inner side of the mill chamber main body 12, a disk described later is placed at a predetermined position of the mill chamber main body 12 (in this embodiment, a position that is approximately one-half the height of the mill chamber main body 12). A partition 30 is arranged. The partition 30 separates the space inside the mill chamber body 12 into an upper mill chamber 12a and a lower mill chamber 12b in the vertical direction. The partition portion 30 is attached to the inner wall of the mill chamber main body 12 so as to be orthogonal to the rotation center axis of the rotation shaft 22 described later. The upper mill chamber 12a is preferably provided with a supply unit for introducing an object to be processed.

  The upper mill chamber 12a and the lower mill chamber 12b are filled with grinding media 50a and grinding media 50b, respectively. The grinding media 50a and the grinding media 50b are, for example, beads. Examples of the material for the beads include glass, alumina, and zirconia. The diameter of the grinding media 50 a is larger than the diameter of the through hole 32 included in the partition portion 30, and the diameter of the grinding media 50 b is smaller than the diameter of the through hole 32 included in the partition portion 30.

  As shown in FIG. 4, the partition portion 30 is provided with a plurality of through holes 32. In the present embodiment, the through hole 32 is not provided in the outer edge portion of the partition portion 30. The partition part 30 is provided with a through hole 34 through which a rotation shaft 22 (described later) passes in the center part. The partition part 30 consists of punching metal.

  The agitation mechanism unit 20 is an agitation unit for agitating and pulverizing the workpiece together with the pulverization medium, and includes a rotating shaft 22, a plurality of agitation arms 24, and a drive motor 26. The rotation shaft 22 is arranged so that the rotation center axis thereof coincides with the center axis of the mill chamber 10, and the lower end of the rotation shaft 22 passes through the upper mill chamber 12 a and the partition portion 30 and reaches the lower mill chamber 12 b. Yes.

  Each stirring arm 24 is provided on a rotating shaft 22 in the mill chamber main body 12 and can rotate integrally with the rotating shaft 22. The four arms of the stirring arm 24 are arranged at equal intervals so as to be orthogonal to the rotation center axis of the rotation shaft 22 and in parallel with each other, starting from the lower end portion of the rotation shaft 22. Of the four arms of the stirring arm 24, the upper two are disposed in the upper mill chamber 12a and the lower two are disposed in the lower mill chamber 12b. Further, the upper end of the rotary shaft 22 passes through the upper portion of the mill chamber 10 and is attached to the drive motor 26. Note that the rotation center axis of the rotation shaft 22 and the center axis of the drive motor 26 also coincide.

  The shutter unit 40 can be opened and closed and is provided on the upper side of the partition unit 30. The shutter unit 40 includes a storage unit 42, an annular space 42 a, a column unit 44, and a shutter blade unit 46. The storage part 42 is formed in an annular shape along the outer wall of the mill chamber 10 at the position where the partition part 30 is disposed. In the storage part 42, an annular space 42 a is provided at a position immediately above the partition part 30 from the inner wall of the mill chamber 10 toward the outside. In the annular space 42a, strut portions 44 composed of 12 rotating strut shafts are arranged at intervals of 30 °, and the rotation central axes of the 12 rotating strut shafts are parallel to the central axis of the mill chamber 10. Yes.

  The shutter blade portion 46 is composed of 12 blade plates made of thin plates. The twelve blades are rotatably supported by twelve rotating strut shafts of the struts 44 whose base ends are provided in the space 42a at intervals of 30 °. The other end of the twelve blades not fixed to the column 44 is directed toward the central axis of the mill chamber 10. It is preferable that an annular elastic member (packing) is mounted on the upper side, the lower side, or both sides of the shutter blade portion 46 in the annular space 42a. Thereby, the impact from the outside can be relieved and the 12 blades can be prevented from vibrating in the direction perpendicular to the plane of rotation.

  In the closed state, two adjacent slats overlap each other, and a circular hole is formed in the center of the overlapping overlap portion so that the rotating shaft 22 passes therethrough. Thus, in the closed state, the shutter part 40 covers the plurality of through holes 32 of the partition part 30 located on the lower side. Also,

  In the open state, the twelve blades of the shutter blade 46 rotate in the clockwise direction in the drawing and stop by hitting the rotating column shaft supporting the blades adjacent to the left. The twelve blades rotated and folded in the open state are stored in the storage unit 42. In the open state, the opening shape formed by the clockwise rotation of the 12 blades is a circle having a diameter smaller than the inner diameter of the mill chamber 10. Further, in order to switch from the open state to the closed state, it is reversed in the counterclockwise direction in the figure and moved to the initial position.

  Such opening / closing control is controlled by a shutter control unit (not shown) of the shutter unit 40. The shutter control unit includes two motors that control the opening / closing operation of the shutter unit 40. Moreover, it is preferable that the shutter part 40 can adjust the outflow amount and the opening / closing timing by adjusting the degree of opening / closing.

  The discharge part 60 is provided in the center part of the bottom face of the lower mill chamber 12b, and is composed of a main body part 62 and a lid part 64. The main body 62 has a cylindrical shape protruding downward from the bottom surface of the mill chamber 10, and the diameter of the cylinder is approximately the same as the diameter of the rotating shaft 22. The lid portion 64 has a disk shape and closes the opening at the lower end of the main body portion 62 of the discharge portion.

  By this wet pulverizer 1, the object to be processed is processed as follows. In this embodiment, the diameter of the through-hole which a partition part has is 10 mm, the diameter of the grinding media 50a is 10 mm or more, and the diameter of the grinding media 50b is 10 mm or less. In the initial state, the shutter unit 40 is in a closed state.

  First, the workpiece is introduced into the upper mill chamber 12a. The upper mill chamber 12a is filled with a grinding medium 50a of 10 mm or more. When the rotating shaft 22 is rotated by the drive motor 26, the stirring arm 24 is also rotated. By this rotation, the object to be processed 50a is subjected to centrifugal force. Further, the rotational movement of the grinding media 50a dragged by the rotational force of the stirring arm 24 and the swirling motion of the circulated fluid of the workpiece are added, and the workpiece is crushed by the grinding media 50a.

  The pulverization process using the pulverization medium 50a is performed until the particle size of the pulverized material in the object to be processed becomes smaller than the diameter of the through hole of the partition part 30. When the pulverization process is completed, the shutter unit 40 is opened and the workpiece in the upper mill chamber 12a flows out into the lower mill chamber 12b. Since the diameter of the grinding media 50a is larger than the diameter of the through hole of the partition part 30, the grinding media 50a remains in the upper mill chamber 12a. The object to be processed which has flowed into the lower mill chamber 12b is further pulverized by the pulverization media 50b having a diameter smaller than that of the pulverization media 50a, and is discharged to the outside of the mill chamber 10 through the discharge unit 60.

  As described above, in the present embodiment, the partition portion 30 is provided in the mill chamber 10, and the space inside the mill chamber 10 is divided into the upper mill chamber 12a and the lower mill chamber 12b, and the pulverization process is performed in the upper mill chamber 12a. To the lower mill chamber 12b. Therefore, the same effect as in the case of batch processing can be obtained in one mill chamber. In addition, since it passes through a plurality of mill chambers, compared to batch processing in which coarse particles are likely to remain in the mill chamber, multistage pulverization is performed in one mill chamber, so that the pulverization efficiency and yield can be improved. Furthermore, it is possible to reduce the consumption of washing water and electric power.

  In the present embodiment, the diameter of the grinding media 50b filled in the lower mill chamber 12b is smaller than the diameter of the grinding media 50a filled in the upper mill chamber 12a. Therefore, atomization can be easily achieved in one mill chamber. Further, the size (diameter) of the grinding media 50 a is larger than the diameter of the through hole of the partition portion 30, and the size (diameter) of the grinding media 50 b is smaller than the diameter of the through hole of the partition portion 30. Therefore, after the pulverization process in the upper mill chamber 12a, the pulverization medium 50a remains in the upper mill chamber 12a, and only the pulverized processing object flows out to the lower mill chamber 12b. Therefore, the management of the grinding media is facilitated.

  Then, with reference to FIG.5 and FIG.6, the modification of the partition part 30 with which the wet crusher 1 mentioned above is provided is demonstrated.

  FIG. 5 is a plan view showing the partition 30 in the first modification. As shown in FIG. 5, the partition portion 30 according to the first modification is provided with a plurality of through holes 32 from the inside to the outside of the partition portion 30. Among the plurality of through holes 32, the diameter of the through hole provided outside the partition part 30 is set larger than the diameter of the through hole provided inside the partition part 30. Thereby, the coarse particle | grains sent to the outer side of the upper mill chamber 12a in response to a large centrifugal force due to the rotation of the stirring arm 24 of the stirring mechanism portion 20 can easily flow out to the lower mill chamber 12b.

  FIG. 6 is a plan view of the partition portion 30 in the second modification. As shown in FIG. 6, a plurality of through holes 32 are provided in the partition portion 30 in the second modification from the inside to the outside of the partition portion 30. Of the plurality of through holes 32, the diameter of the through hole provided inside the partition part 30 is set larger than the diameter of the through hole provided outside the partition part 30.

  When the stirring arm 24 rotates, the dispersion medium in the mill chamber 10 moves in the direction of centrifugal force, that is, the flow from the inside to the outside in the mill chamber 10 is opposite to the direction of centrifugal force. A flow from the outside toward the inside occurs in the mill chamber 10 and circulates in the mill chamber 10. Therefore, when the diameter of the through hole provided inside the partition part 30 is larger than the diameter of the through hole provided outside the partition part 30, the mill chamber 10 is caused by the flow in the direction opposite to the direction of the centrifugal force. Coarse grains in the workpiece transferred from the outside to the inside can easily flow out to the lower space.

  In the modification shown in FIGS. 5 and 6, the outer edge portion of the partition portion 30 is not provided with a plurality of through holes 32. Thus, it is possible to reliably secure a period in which the processing object that is relatively likely to stay outside due to the rotation of the stirring arm 24 and the pulverization medium 50a stay together in the mill chamber 10, and efficiently pulverize the processing object. Can do.

  Then, with reference to FIG. 7, the modification of the wet crusher 1 mentioned above is demonstrated. FIG. 7 is a schematic diagram showing a modified example of the wet pulverizer 1.

  As shown in FIG. 7A, the wet pulverizer 1 according to the third modification is provided with two partition portions 30 a and 30 b in the mill chamber 10. As shown in FIG. 7B to FIG. 7C, the diameters of the plurality of through holes 32 included in the partition part 30b located on the lower side of the partition part 30a are equal to the plurality of through holes 32 included in the partition part 30a. Smaller than the diameter of Thereby, the to-be-processed object grind | pulverized sequentially in several space and finally atomized to the desired grade can be obtained. The shutter part 40 may be provided on the upper side of each of the two partition parts 30. In this modification, two partition portions 30 are provided in the mill chamber 10, but three or more partition portions 30 may be provided.

  Next, with reference to FIG. 8, the grinding | pulverization system 100 comprised using the wet grinding machine 1 which concerns on this embodiment is demonstrated. FIG. 8 is a block diagram showing a pulverization system 100 configured using the wet pulverizer 1 according to the present embodiment. The crushing system 100 includes a mill chamber 1 (discharge unit 60), a discharge unit 66, a material supply unit 70, a solvent supply unit 72, valves (85a and 85b), pumps (88a and 88b), a tank 90, and lines (80 and 82). , 84, 86).

  The material supply machine 70 and the solvent supply machine 72 are arranged in the upper part of the mill chamber 1. One end of a circulation line 80 that interposes a valve 85a and a pump 88a is connected to the discharge portion 60 provided at the bottom of the mill chamber 1. The other end of the circulation line 80 is located above the tank 90. A discharge portion 66 is provided on the bottom surface of the tank 90, and a line 82 is connected to the discharge portion 66. A pump 88b is interposed in the line 82, and one end of a switching valve 85b is connected. .

  One end of a circulation line 84 is connected to the other end of the switching valve 85b, and the other end of the circulation line 84 is located above the mill chamber 1. A transfer line 86 for moving the object to be processed in the next process is connected to the switching valve 85b. The switching valve 85b has an L-shaped flow path. By rotating the L-shaped flow path, the state 1 for connecting the line 82 to the circulation line 84 and the state 2 for connecting the line 82 to the transfer line 86 are provided. You can switch to

  The workpiece to be crushed in the mill chamber 1 by the operation of the pump 88 a is extracted from the mill chamber 1 and flows into the tank 90. When the object to be processed that has flowed into the tank 90 is pulverized again, the switching valve 85b is set to the state 1, and the object to be processed is returned to the mill chamber 1. On the other hand, when the object to be processed in the tank 90 has finished the final pulverization process, the valve 85b is set in the state 2 so that the object to be processed passes through the transfer line 86 and is moved to the next step.

  The preferred embodiment of the present invention and the three modifications thereof have been described above, but various modifications can be made to the embodiment and the three modifications without departing from the gist of the present invention.

  In the present embodiment, a configuration in which the through hole 32 is not provided in the outer edge portion of the partition portion 30 is adopted, but the configuration in which the through hole 32 is provided in the outer edge portion of the partition portion 30 is not limited to this. May be. When the through-hole 32 is provided in the outer edge part of the partition part 30, there exists a possibility that a grinding | pulverization efficiency may reduce.

  In this embodiment, although the partition part 30 is a fixed type, it is not restricted to this. For example, the partition portion 30 may be detachable from the inner wall of the mill chamber 10 and may be removable from the mill chamber 10.

  In this embodiment, the stirring arm 24 is an arm type, but may be a disk type, a pin type, a pin disk type, or the like. In this embodiment, the stirring arm 24 is directly attached to the rotating shaft 22, but may be detachable.

  In the present embodiment, the shutter control unit of the shutter unit 40 includes two motors, but may include a drive mechanism including a solenoid plunger, a sensor, and the like.

It is a side view which shows the wet crusher which concerns on this embodiment. It is a top view which shows the closed state of the shutter in the wet crusher which concerns on this embodiment. It is a top view which shows the open state of the shutter in the wet crusher which concerns on this embodiment. It is a top view which shows an example of a partition part in the wet crusher which concerns on this embodiment. It is a top view which shows one modification of a partition part. It is a top view which shows one modification of a partition part. It is a schematic diagram which shows the modification of the wet crusher which concerns on this embodiment. It is a block diagram which shows the grinding | pulverization system using the wet grinding machine which concerns on this embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Wet grinder, 10 ... Mill chamber, 12a ... Upper mill chamber, 12b ... Lower mill chamber, 20 ... Stirring mechanism part, 22 ... Rotating shaft, 24 ... Stirring arm, 26 ... Drive motor, 30 ... Partition part, 32 ... a plurality of through holes, 40 ... a shutter part, 50a, 50b ... grinding media.

Claims (8)

A cylindrical mill chamber,
A partition that is arranged inside the mill chamber and divides the space inside the mill chamber into a plurality of spaces in the vertical direction;
Stirring means for stirring and pulverizing the workpieces introduced into the plurality of spaces together with pulverization media,
The partitioning portion is provided with a plurality of through holes.   2. The wet pulverizer according to claim 1, wherein the agitation unit includes a rotation shaft, a drive motor that rotates the rotation shaft, and an agitation arm provided on the rotation shaft. . The plurality of through holes are provided from the inside to the outside of the partition part,
3. The wet pulverization according to claim 2, wherein a diameter of a through hole provided outside the partition portion among the plurality of through holes is larger than a diameter of a through hole provided inside the partition portion. Machine. The plurality of through holes are provided from the inside to the outside of the partition part,
The wet pulverization according to claim 2, wherein a diameter of a through hole provided inside the partition portion among the plurality of through holes is larger than a diameter of a through hole provided outside the partition portion. Machine.   The wet pulverizer according to any one of claims 2 to 4, wherein the plurality of through holes are not provided in an outer edge portion of the partition portion.   The wet pulverizer according to any one of claims 1 to 5, wherein the partition portion is made of a punching metal.   The wet pulverizer according to any one of claims 1 to 6, further comprising a shutter portion that is located above the partition portion and that can be opened and closed. A plurality of the partition portions are arranged in the vertical direction,
In the plurality of partition portions, the through hole provided in the partition portion in which the diameter of the through hole provided in the partition portion located on the lower side of the two partition portions adjacent in the vertical direction is located on the upper side. The wet pulverizer according to any one of claims 1 to 7, wherein the wet pulverizer is smaller in diameter.

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