WO2022080028A1 - ビーズミル - Google Patents

ビーズミル Download PDF

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Publication number
WO2022080028A1
WO2022080028A1 PCT/JP2021/032041 JP2021032041W WO2022080028A1 WO 2022080028 A1 WO2022080028 A1 WO 2022080028A1 JP 2021032041 W JP2021032041 W JP 2021032041W WO 2022080028 A1 WO2022080028 A1 WO 2022080028A1
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WO
WIPO (PCT)
Prior art keywords
slurry
storage tank
bead
component
mill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/032041
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
哲治 茨城
郁 山口
正之 棗田
大介 平田
浩司 千田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hiroshima Metal and Machinery Co Ltd
Original Assignee
Hiroshima Metal and Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hiroshima Metal and Machinery Co Ltd filed Critical Hiroshima Metal and Machinery Co Ltd
Priority to JP2021573269A priority Critical patent/JP7307981B2/ja
Priority to EP21879770.2A priority patent/EP4205855B1/en
Publication of WO2022080028A1 publication Critical patent/WO2022080028A1/ja
Priority to US18/134,265 priority patent/US20230256453A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/163—Stirring means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/161—Arrangements for separating milling media and ground material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details

Definitions

  • the particles in a suspension of solid particles are crushed and dispersed by stirring hard particles (hereinafter referred to as beads) which are stirring media in a container.
  • stirring hard particles hereinafter referred to as beads
  • the bead mill As a device for crushing and dispersing fine particles in a slurry, there are a high-pressure jet mill, an ultrasonic homogenizer, a bead mill, and the like. Of these, the bead mill is capable of continuous processing and has excellent crushing and dispersing functions such as being able to crush and disperse from micrometer size to nanometer size.
  • a rotating member (stirring rotor) rotates at high speed in a closed cylindrical container to generate a shearing force between the cylindrical container and the stirring rotor, and the beads suspended in the slurry are generated. It is a device (bead mill) that crushes and disperses particles in the slurry by impact force.
  • the apparatus of the invention (bead mill 1) disclosed in the patent document of Document 1
  • a stirring rotor at the lower part of the cylindrical container, and by rotating this, the particles are crushed and the primary particles are aggregated.
  • Perform particle dispersion processing In order to efficiently carry out pulverization / dispersion, beads having a diameter of about 0.05 to 5 mm are mixed in the slurry to carry out the treatment.
  • the upper bead separating device separates beads from the slurry that has been pulverized and dispersed.
  • the bead mill (bead mill 2) described in Patent Document 2 stirs a mixture of slurry and beads in a cylindrical container by a large bead separating device instead of a stirring rotor.
  • the pulverization treatment means dividing a single particle into a plurality of particles
  • the dispersion treatment means that the secondary particles composed of the plurality of particles are separated and the primary particles are dispersed independently. It means to put it in a state.
  • the primary particles refer to crystalline or amorphous single particles of a substance, and the secondary particles generally form pseudo particles in which the surfaces of several to several thousand primary particles come into contact with each other. Say what you have.
  • the beads used for the pulverization / dispersion treatment are ceramic particles such as alumina and zirconia, metal particles such as stainless steel, and plastic particles of several tens of micrometers to several millimeters, and generally spherical beads are desirable.
  • the bead mill is capable of continuous processing and has excellent crushing / dispersing functions such as being able to crush / disperse from micrometer size to nanometer size, but has the following problems.
  • the beads are agitated in the cylindrical container to grind or disperse the particles in the slurry to separate the beads in the cylindrical container.
  • the pushing pressure is high.
  • the rotating shaft for rotating the stirring rotor in the cylindrical container since the rotating sliding portion is in contact with the slurry, it is necessary to seal the rotating portion in order to prevent liquid leakage.
  • a sealing structure using a mechanical sealing device has generally been used for sealing the rotating portion of such a relatively high pressure portion.
  • a sealing device such as a mechanical seal is required to prevent the high-pressure slurry in the container from leaking out from the sealing part.
  • a sealing device such as a mechanical seal
  • the mechanical seal had a structure to store the sealing liquid. Since the parts in the seal contact portion are gradually worn, there is a problem that the seal performance deteriorates with time. As a result, there is a problem that the sealing liquid leaks into the slurry and contaminates the slurry.
  • wear debris of seal contact part parts metal, ceramics, etc.
  • the sealing device becomes severely worn, it is necessary to replace the sealing device, which causes a problem that it is costly.
  • the wear of the seal portion of the slurry containing metal powder such as nickel is large, which causes a serious problem.
  • a further problem with the sealing device is that the mechanical seal has a complicated structure consisting of multiple parts, and there are seams and uneven parts.
  • a bead mill having a sealing device there is a problem that the slurry adheres to the seams and uneven portions.
  • the product slurry cannot be commercialized due to the spoilage of the adhered matter, and that the slurry is contaminated after the product is changed due to poor cleaning.
  • there are problems associated with wear and deposits of the sealing device and a new technique for solving these problems has been sought.
  • a bead mill device in which the rotation axis is installed in the vertical direction, and a slurry storage tank is installed on a container for processing a slurry using beads.
  • a slurry passage hole is installed in the lower part of the container, and a slurry flow path through which the slurry can pass is installed between the upper lid of the container and the slurry storage tank.
  • the rotation axis reaches the inside of the container from above the slurry storage tank through the space of the slurry flow path.
  • the rotation shaft has a mechanism for flowing the slurry in the slurry flow path downward, and the rotation is above the position where the stirring rotor or the centrifugal bead separating device at the uppermost portion of the cylindrical container is installed.
  • a swivel promotion component that swirls the slurry as the shaft rotates is installed.
  • the bead mill having the structure of the above (1), in which the slurry is supplied from the slurry passage port installed in the lower lid of the cylindrical container and the slurry flows upward.
  • a centrifugal bead separating device is installed at the position of the upper part of the container on the rotating shaft. Further, inside the rotating shaft, a hollow path is installed to allow the slurry that has passed through the centrifugal bead separating device to flow out into the slurry storage tank.
  • the slurry is flowed in a direction away from the rotation center of the rotation shaft to the slurry outlet of the hollow path provided on the rotation shaft, and is contained in the slurry storage tank.
  • the flow path for sucking the slurry flow from the slurry outlet is fixed by centrifugal force.
  • a screen for filtering the rising slurry and separating the beads is installed in the slurry in the slurry storage tank.
  • a partition plate for dividing the slurry stored in the slurry storage tank into upper and lower parts is installed, and the partition plate has the partition plate.
  • a plurality of parts for preventing slurry rotation installed in the slurry storage tank are arranged so as to divide the inside of the slurry storage tank in the circumferential direction. It is composed of vertical plates.
  • the component for preventing the slurry rotation installed inside the slurry storage tank is a structure surrounding the rotation axis such as the shape of a cylinder or a polygonal cylinder. It is composed of a combination of vertical plates arranged to divide the inside of the slurry storage tank in the circumferential direction.
  • the bead mill of the present invention does not have a rotating portion sealing device in contact with the slurry, the problem of wear of the contact member of the rotating portion sealing device, which is a problem associated with wear of the worn sealing component fragments and the sealing liquid, is eliminated from the contamination of the product slurry. .. In addition, it is possible to solve the problem that particles in the slurry stick to the rotating portion sealing device and are difficult to clean.
  • the device of the present invention which has a centrifugal bead separating device and has a bead outflow prevention screen and a rotating component for sucking out the slurry fixed to the rotating shaft by centrifugal force in the slurry storage tank. ..
  • the device of the present invention which has a centrifugal bead separating device and has a bead outflow prevention screen, a component for suppressing slurry rotation, and a component for giving rotation to the slurry under the screen, installed in the slurry storage tank. This is an example.
  • Slurry installed in the apparatus of the present invention It is a figure which shows the example of the component of the function which flows the slurry downward.
  • Slurry installed in the apparatus of the present invention It is a figure which shows the example of the component of the function which flows the slurry downward.
  • a structural example of a component (swivel vane 13) having a function of swirling the slurry on the upper part of the cylindrical container and a swivel component 20 under the screen is shown.
  • FIGS. 1, 2 and 3 The structural outline of the apparatus of the present invention is shown in FIGS. 1, 2 and 3.
  • This is a bead mill in which the stirring rotor 5 rotates in a cylindrical container composed of a cylinder 2, an upper lid 1 and a lower lid 3.
  • the rotating shaft 4 is installed in the vertical direction, and has a slurry storage tank 6 on the cylindrical container.
  • the direction of the rotating shaft 4 does not have to be completely vertical, and may be tilted as long as it is within about 15 degrees.
  • the cylindrical container and the slurry storage tank 6 are connected by a slurry flow path 7, through which a slurry passes, and a rotating shaft 4 rotated by a drive device installed above the cylindrical container is a slurry storage tank. 6. It extends into the cylindrical container through the slurry flow path 7.
  • a stirring rotor 5 for stirring a mixture of the slurry and beads of the cylindrical container is fixed to the rotating shaft 4. Further, a liquid feeding component for flowing the slurry in the slurry flow path 7 downward is fixed to the rotating shaft 4.
  • the liquid feed component is installed inside the slurry flow path 7 or at the top of the cylindrical container. By the action of the liquid feeding component, a downward flow is formed in the slurry flow path 7, so that the slurry is mixed with the slurry in the cylindrical container even if there is no sealing structure between the rotating shaft 4 and the fixing member (upper lid 1). It is possible to prevent leakage of the beads.
  • FIGS. 1 to 3 An example of the detailed structure is shown in FIG. 4, in which the cylindrical portion 25 is provided with a groove 27. Further, the cylindrical portion 25 as shown in FIG. 5 may be provided with a spiral protrusion 26.
  • the liquid feeding component does not necessarily have to have this shape, and may be an axial flow type pumping mechanism or the like. Further, in FIGS.
  • the slurry is flowed from the central portion to the peripheral portion by the swivel promoting component (swivel vane 13) that swirls the slurry at the uppermost portion of the cylindrical container.
  • the swivel promoting component swivel vane 13
  • a method is described in which beads are pushed to the outer peripheral portion of the cylindrical container by using centrifugal force and the slurry is sucked out from the slurry flow path 7.
  • FIG. This figure is a view of the parts as viewed from above, and an example is described in which a linear plate having a receding angle in the rotation direction is installed as a swivel blade 13 on the upper part of the disk 24.
  • the swivel blade 13 may be linear or curved. It is desirable that the swivel blade 13 has a receding angle (10 to 45 degrees) in the rotation direction. In the case of a curved plate, the angle of the outermost part is regarded as the receding angle.
  • the component for swirling the slurry does not necessarily have to be in the shape of the swirling blade 13, for example, a disc having a plurality of grooves, or in the case of FIG.
  • the slurry has a function of swirling and flowing the slurry from the central portion to the outer peripheral portion.
  • the liquid feeding component in the slurry flow path 7 such as the pumping component 9 can be used. With the omitted configuration, it is sufficient to install a swivel promoting component that swirls the slurry at the top of the cylindrical container. By rotating the slurry on the upper part of the cylindrical container at high speed, the slurry in the central portion is pushed out to the peripheral portion, which has the effect of sucking the slurry in the slurry flow path 7.
  • the component that suppresses the slurry rotation may have any shape as long as the rotation can be suppressed.
  • a component in which a plurality of partition plates shown in FIGS. 1 and 2 are installed in the radial direction to stop the rotation.
  • the number of boards is preferably 3 to 12.
  • a cylinder swivel prevention pipe 22
  • a comb-shaped component may be installed in the slurry in the slurry storage tank 6 to create a flow resistance to suppress the swirling of the slurry.
  • the method 1 has a centrifugal bead separating device in a cylindrical container, and the slurry is supplied from the slurry passage port 8 of the lower lid 3 of the cylindrical container.
  • the centrifugal bead separating device may be of any form, but the centrifugal bead separating device used in the experiment by the present inventors is the centrifugal bead separating device 11 of FIG. 1 and the detailed drawing is shown in FIG. As shown, a plurality of plates (bead separation plates 33) were fixed to a pair of upper and lower disks (upper fixing plate 31 and lower fixing plate 32).
  • the bead separation plate 33 was installed so that the distance between the outer peripheral portions thereof was 10 to 40 mm, and had a receding angle of 10 to 40 degrees in the rotation direction.
  • the centrifugal bead separating device that can be used in the present invention includes a device having a spiral impeller.
  • the slurry passage port 8 of the lower lid 3 is used for slurry discharge, and a slit type or screen type bead separation device such as the slit type bead separation device 23 of FIG. 3 is installed here. ..
  • the slurry flows downward from the top, is beaded and discharged out of the mill.
  • a slurry flow is formed from the center to the periphery on the component that allows the slurry to flow downward in the slurry flow path 7, and the slurry between the upper surface of the centrifugal bead separation device 11 and the upper lid 1, and centrifugal force is applied.
  • It features a structure in which parts that prevent bead leakage are installed. With this structure, a bead mill having no sealing structure in the rotating portion is configured.
  • the stirring rotor 5 is installed under the centrifugal bead separating device 11, but the stirring rotor 5 is omitted by giving the stirring function to the centrifugal bead separating component itself. In some cases.
  • the mixture of the slurry and the beads is stirred in a cylindrical container, and then the beads are separated from the slurry by using centrifugal force.
  • the centrifugal bead separating device 11 is fixed to the rotating shaft 4.
  • the slurry from which the beads are separated by centrifugal force is discharged to the slurry storage tank 6 through the flow path 12 in the rotating shaft constructed inside the rotating shaft 4. After that, the slurry is discharged from the slurry storage tank 6 to the outside of the apparatus through the slurry connecting flow path 10.
  • the slurry connecting flow path 10 is not always necessary, and a structure in which the slurry is sucked up from the slurry storage tank 6 by a suction pipe may be used.
  • a part of the slurry in the slurry storage tank 6 is fed downward by the pumping component 9 having a function of feeding the slurry downward, which is installed on the rotating shaft 4. The downward flow of the slurry formed in this way prevents beads from leaking in the slurry flow path 7.
  • the centrifugal bead separating device 11 When using fine beads of 0.3 mm or less, the amount of beads flowing back in the slurry flow path 7 may increase. Therefore, as shown in FIG. 1, the upper surface of the centrifugal bead separating device 11 is radially applied.
  • a swivel promoting component such as a swirling vane 13 to be installed and applying centrifugal force to the slurry to push the beads around the slurry flow path 7 to the outer peripheral portion of the cylindrical container, the beads leak into the slurry flow path 7. It is necessary to suppress.
  • the arrangement of the swivel blades 13 here is the same as the arrangement shown in FIG. Note that FIG.
  • FIG. 6 is a diagram of the combination of the swivel blade 13 of the method 2 and the upper disk 24, but the basic arrangement of the swivel blade 13 is the same.
  • the pumping component 9 and the swirling vane 13 it is possible to suppress the backflow of beads due to pressure fluctuation in the mill or the like. Further, as long as the functions are the same, a device having a radial groove on the upper surface of the centrifugal bead separating device 11 may be used.
  • the outer peripheral diameter of the swirling blade 13 is 0.82 times or more the outermost diameter of the component that swirls the slurry of the centrifugal bead separating device 11. Further, more preferably, 0.82 to 1.48 times is better. This is because there is an optimum value in the ratio of the centrifugal force formed by the swirling vane 13 to the centrifugal force formed by the centrifugal bead separating device 11. If the centrifugal force formed by the swirl vanes 13 is too strong, the amount of slurry circulated from the slurry storage tank 6 through the slurry flow path 7 to the cylindrical container is too large, and the amount of slurry passing through the centrifugal bead separating device 11 is excessive. May cause problems.
  • the component that swirls the slurry of the centrifugal bead separating device 11 may have any shape as long as it swirls the slurry.
  • the equipment is fixed in a disk shape such as the bead separation plate 33 of FIG. 8 and has a clear surface for pushing the slurry in the rotation direction.
  • the diameter of the outermost part is defined by the outermost diameter of the part that gives the slurry a swirl.
  • the slurry flow is swirled. Due to the influence of the dynamic pressure applied to the swirling slurry flow, a force for sucking the slurry in the flow path 12 in the rotating shaft acts. As a result, in the cylindrical container, the slurry flow flowing into the centrifugal bead separating device 11 is promoted, so that the slurry flow flowing back through the slurry flow path 7 is less likely to occur, and the beads leakage to the slurry storage tank 6 can be suppressed. ..
  • the swirling slurry discharge component 29 may have any structure as long as it swirls the slurry flow, but a circular or square tube is provided at the slurry outlet of the flow path 12 in the rotating shaft divided into two to four places.
  • a structure in which a plurality of blades are installed on two upper and lower disks that apply centrifugal force to the slurry discharged from the flow path 12 in the rotating shaft is preferable.
  • FIG. 7 shows a structure in which two cylindrical pipes (slurry rotary pipe 30) are installed at the slurry outlet of the flow path 12 in the rotary shaft.
  • the flow path 12 in the rotating shaft has two slurry outlets, and a slurry rotating pipe 30 is installed in each of them.
  • the slurry rotary tube 30 may be installed radially from the center of rotation in the radial direction, or may be installed with a receding angle in the rotational direction of the rotary shaft 4. This receding angle is preferably in the range of 0 to 30 degrees. In the example of FIG. 7, the slurry rotary tube 30 has a structure that draws an arc that recedes in the rotational direction.
  • the centrifugal bead separator As a structure for applying centrifugal force to the slurry after being discharged from the flow path 12 in the rotating shaft, two upper and lower circular fixing plates are installed on the rotating shaft 4, and a plurality of plates are installed on these fixed plates. The movement of the plate pushes the slurry toward the outer circumference. Its structure is similar to that of the centrifugal bead separator shown in FIG.
  • the diameter of the outer peripheral portion of the slurry rotary tube 30 or the plate is affected by the size of the bead mill, the slurry conditions, the bead diameter used, and the like, but the outer peripheral portion of the component that swirls the slurry of the centrifugal bead separating device 11 is 0. .3 to 1 times is good.
  • the bead separation plate 33 may have a receding angle of 10 to 40 degrees with respect to the rotation direction.
  • the apparatus of the present invention shown in FIG. 2 further installs a component for the purpose of preventing bead leakage in the slurry storage tank 6.
  • a component for the purpose of preventing bead leakage in the slurry storage tank 6. Even in the bead mill having the above structure in which the pumping component 9 and the swivel blade 13 are installed, which is the basic structure of the present invention, a small amount may be used when the slurry has a high viscosity or when beads of about 0.1 mm are used. However, the beads may flow back through the slurry flow path 7.
  • a screen 19 is installed below the slurry liquid level to prevent the beads from flowing out of the slurry storage tank 6. If the slurry liquid level is not flat, a part of the screen 19 may come out on the liquid level.
  • the screen 19 may have a wire mesh installed on the entire surface or a wire mesh may be partially installed on the screen 19.
  • the mesh spacing of the screen 19 is preferably 0.4 to 1.5 times the bead diameter
  • the screen 19 is fixed to the inner surface of the slurry storage tank 6 and there is no gap in the contact portion between the screen 19 and the slurry storage tank 6.
  • a gap between the screen 19 and the rotating shaft 4 beads suspended in the slurry may pass through the gap depending on the conditions.
  • the under-screen swivel component 20 also has the effect of flowing the slurry between the rotary shaft 4 and the screen 19 downward and swirling the slurry so that the beads are not brought close to the distance between the rotary shaft 4 and the screen 19 by centrifugal force. ..
  • the shape of the under-screen swivel component 20 is not limited as long as it has a function of flowing the slurry from the center to the outside by rotation.
  • the disk 24 installed in the cylindrical container and the disk having the same structure as the swivel vane 13 have a plurality of radial linear protrusions, and as another shape, the disk has a plurality of radial protrusions. Some have grooves and some have multiple blades installed on the shaft.
  • the pumping component 21 is, for example, the same as the pumping component 9 shown in FIGS. 4 and 5, and preferably has a cylindrical structure with a groove or a screw-shaped component composed of a plurality of blades. Although both the under-screen swivel component 20 and the pumping component 21 are shown in FIG. 1, only one of them may be installed.
  • the bead leakage suppressing function of the swivel component 20 under the screen is sufficient, the bead leakage can be prevented even if the slurry does not pass through the screen 19 and only passes through the gap between the screen 19 and the rotating shaft 4. That is, under the screen 10, the beads are pushed outward from the outer peripheral portion of the under-screen swirling component 20 by the centrifugal force of the slurry swirling, so that the slurry that rises in the gap between the screen 19 and the rotating shaft 4 contains the beads. It disappears. Due to this effect, the beads do not leak above the screen 19 through the gap. Therefore, in the case of such a swivel component under the screen 20, the screen 19 may be a partition plate having a structure through which the slurry does not pass.
  • a partition plate that divides the slurry stored in the slurry storage tank 6 into upper and lower parts is installed at the position of the screen 19. Further, the rotating shaft 4 passes through the opening provided in the partition plate. Further, a component for swirling the slurry is installed on the rotating shaft 4 below the opening.
  • the under-screen swivel component 20 is installed as the component.
  • the under-screen swivel component 20 that realizes this form of bead mill may have any shape as long as it realizes slurry swirl that forms a sufficient centrifugal force, but as shown in FIG. 1, it is a disk. The one with a pattern that promotes turning on the upper surface is the best. Those having a plurality of linear protrusions shown in FIG. 6 and those having a plurality of linear grooves are preferable.
  • a swivel prevention plate 18 may be attached inside the slurry storage tank 6.
  • the swivel prevention plate 18 is a vertical plate installed so as to face the diameter direction of the slurry storage tank 6, and a plurality of the anti-swivel plates 18 are installed. The proper number of installations is 3 to 12.
  • the swivel prevention plate 18 is most commonly fixed to the side surface of the slurry storage tank 6, but may be fixed to the bottom surface of the slurry storage tank 6. Further, although not shown in FIG. 2, it is further preferable that the swivel prevention plate 18 is joined to the swivel prevention pipe 22 as shown in FIG. The anti-swivel pipe 22 further mitigates the influence of the motion of the rotating shaft 4, and further accommodates the slurry flow in the slurry storage tank 6.
  • the anti-swivel pipe 22 has a shape such as a cylinder or a polygonal cylinder, and has a structure that separates the rotating shaft 4 from the surrounding slurry inside the slurry storage tank 6. Further, a hole or the like may be opened in a part thereof.
  • a component for sucking the slurry in the flow path 12 in the rotary shaft shown in FIG. 1 inside the slurry storage tank 6 and a component for bead filtration shown in FIG. 2 are used.
  • a screen 19 and a slurry rotation prevention component are installed, a combination of the structures of FIGS. 1 and 2 is also within the scope of the present invention.
  • the bead mill having this apparatus configuration is installed as a main component in a cylindrical container composed of a cylinder 2, an upper lid 1, and a lower lid 3, a stirring rotor 5 connected to a rotating shaft 4, and a slurry passage port 8 of the lower lid 3. It is a bead mill configured around the slit type bead separation device 23 to be formed, and a slurry storage tank 6 is further installed in the upper part of the cylindrical container.
  • a bead separation device of a type such as a slit type bead separation device 23 is installed in which the slurry is passed through a gap narrower than the diameter of the beads to be used to separate the beads.
  • the distance between the slit type bead separation device 23 and the slurry passage port 8 is adjusted so that the beads do not leak.
  • the bead separation device of the present invention may be of any type as long as it allows the slurry to pass through a narrow gap, and includes a slit type, a mesh screen type, a parallel wire type, and the like.
  • the swivel blade 13 may be a straight line or a curved line, and it is desirable that the swivel blade 13 has a receding angle of 0 to 40 degrees in the rotation direction. Further, the outer peripheral diameter of the swirl vane 13 is preferably larger than the outer peripheral diameter of the stirring rotor 5.
  • the slurry in the slurry storage tank 6 swirls due to the influence of the rotation of the rotating shaft 4 and the pumping component 9 and the influence of the slurry swirling in the cylindrical container. Air may be caught in the cylindrical container from the space of the storage tank 6. As a result, there arises a problem that the treatment cannot be continued due to foaming of the slurry and a problem that the stirring by the stirring rotor 5 becomes insufficient.
  • anti-rotation parts are installed in the slurry storage tank 6.
  • a mechanical seal structure (generally a mechanical seal device) is installed between the upper part of the cylindrical container and the rotating shaft.
  • This is a state in which the inside of the cylindrical container is pressurized by pushing the slurry into the mill with a pump or the like in order to cope with the liquid resistance during the processing in the cylindrical container and the pressure loss in the bead separating device. Therefore, a sealing mechanism is required around the rotation axis.
  • the apparatus of the present invention has a structure in which pressure is applied to the inside of the cylindrical container by a pumping component 9 or the like installed between the rotating shaft 4 which is a rotating component and the slurry flow path 7 which is a fixed component. Even without the sealing mechanism, it is possible to create a pressure difference between the inside and the outside of the cylindrical container (in the case of the present invention, the outside is the slurry storage tank 6). As a result, the mechanical sealing device can be omitted.
  • the bead mill according to the present invention is used for pulverizing a slurry containing fine powders such as ceramics, carbon nanotubes, cellulose nanofibers, pigments, inks, paints, dielectrics, magnetic substances, inorganic substances, organic substances, pharmaceuticals, foods, and metal powders. Applies to distributed processing.
  • the first device (method 1: mill 1) was tested with six component configurations of mill 1a, mill 1b, mill 1c, mill 1d, mill 1e and mill 1f.
  • the basic structure of the mills 1a to 1e is as shown in FIG.
  • the mesh spacing of the screen 19 was 0.08 to 0.15 mm.
  • parts for adjusting the slurry flow in the gap between the screen 19 and the rotating shaft 4 were installed.
  • a partition plate was installed instead of the screen 19, and a swivel component under the screen was installed in order to adjust the slurry flow in the gap between the partition plate and the rotating shaft 4.
  • the installation position of the partition plate was the same as that of the screen 19 of the mills 1b to 1e.
  • an experiment for obtaining a good outer peripheral diameter of the swirl vane 13 was also performed.
  • the mill 1f was as shown in FIG. Table 1 shows the specifications.
  • the swivel blade 13 is installed in the mill 1a, nothing is installed inside the slurry storage tank 6, and only the swivel blade 13 and the screen 19 are installed in the mill 1b, and only the swivel blade 13 and the screen 19 are installed in the mill 1c. In addition to the swivel blade 13, the screen 19 and the swivel prevention plate 18 were installed. Further, in the mill 1d, in addition to the configuration of the mill 1c, a swivel component 20 under the screen was installed. The under-screen swivel component 20 had the structure shown in FIG. 6, and the outer peripheral diameter of the blade was 40 mm.
  • a pumping component 21 was installed in addition to the configuration of the mill 1c. Further, in the mill 1f in which the component for rotating the slurry flowing out from the flow path 12 in the rotating shaft is installed, the slurry rotating tube 30 shown in FIG. 7 having an outer peripheral diameter of 26 mm is installed. .. The outer peripheral diameter of the blade of the centrifugal bead separating device 11 was 44 mm.
  • the second device (method 2: mill 2) was a bead mill equipped with a contact-type slit-type bead separation device 23 at the bottom of the mill, and basically had the structure shown in FIG.
  • the swivel blade 13 is installed, but neither the swivel prevention plate 18 nor the swivel prevention pipe 22 is installed.
  • the swivel prevention plate 18 and the swivel prevention pipe 22 are installed. Both of 22 were installed.
  • the main specifications are shown in Table 1.
  • Mill I and Mill II which are devices in which the swivel blade 13, the swivel prevention plate 18, the swivel prevention pipe 22, the screen 19, etc. are not installed in the mill of the same cylindrical container as the mill 1 and the mill 2.
  • the experiment used was also performed. These specifications are also listed in Table 1.
  • the fluid supplied into the cylindrical container is water
  • the fluid supplied from the mill 2a of the method 2 to the mill II is water and a high-viscosity liquid having a viscosity of 550 mPa ⁇ s. there were.
  • the flow rate was 8 liters / hour.
  • the effect of the ratio of the outer peripheral diameter of the swirling vane 13 to the outer peripheral diameter of the component swirling the slurry of the centrifugal bead separating device 11 on bead leakage was investigated.
  • Six swivel blades 13 were installed, and the length was 12 mm and the height was 5 mm.
  • the receding angle of the swivel blade 13 is most preferably 10 to 45 degrees, so in this experiment, the receding angle was set to 30 degrees.
  • an experiment was conducted to determine an appropriate outer peripheral diameter of the swivel blade 13 in the apparatus configuration of the mill 1a.
  • the outer peripheral diameter of the component that swirls the slurry is the outermost peripheral portion of the component other than the surface (approximately an angle within 30 degrees) that is close to parallel to the rotation direction such as the plate that holds the swivel vane 13. Defined by diameter.
  • FIG. 8 is a structural diagram of the centrifugal bead separation device 11 used in this experiment.
  • the component that swirls the slurry is the bead separation plate 33.
  • the outer peripheral diameter of the swirl vane 13 is in the range of 32 to 65 mm (outer peripheral diameter ratio: 0.73 to 1.48), and 7 liters of water is used using 0.3 mm beads.
  • the experiment was carried out at a flow rate of / hour.
  • the experimental conditions were that the outer peripheral speed of the bead separation plate 33 was in the range of 4 to 12 m / sec.
  • the bead leakage status was confirmed using beads having a diameter of 0.1 mm and a diameter of 0.3 mm from the mill 1a to the mill 1f and the mill I.
  • As the treatment conditions water at room temperature was used, and beads were placed in the mill so that the filling rate was 75%.
  • the experiment was carried out by changing the outer peripheral speed of the slurry swirling component (bead separation plate 33) of the centrifugal bead separation device 11 to 4 to 12 m / sec every 2 m / sec. The results of this experiment are shown in Table 3. In the experiment with beads having a diameter of 0.3 mm, in the Mill I of the comparative example, bead leakage was observed when the outer peripheral speed of the bead separation plate 33 was 4 m / sec.
  • the effect of the slurry rotary tube 30 has the effect of sucking out the slurry in the flow path 12 in the rotating shaft, the flow of the slurry to the centrifugal bead separating device 11 is stabilized, and the mill I of the comparative example. There was little bead leakage to the slurry storage tank 6 not only in the treatment of the above but also in the treatment of the mill 1a to the mill 1e.
  • the experiment of 1 g of the mill is an example in which a partition plate through which the slurry does not pass is installed instead of the screen 19.
  • a component having the structure shown in FIG. 6 was installed on the rotary shaft 4.
  • the diameter of the under-screen swivel component 20 is 44 mm, which is 1.0 times the diameter of the bead separation plate 33 of the bead separation device, and because sufficient centrifugal force can be formed to push the beads outward, the slurry can be formed. There was no upward bead leakage from the slurry storage tank even when the entire amount passed through the space between the rotating shaft 4 and the partition plate.
  • the problem of wear of the pumping component 9 did not occur, and the beads did not flow back into the slurry storage tank 6.
  • the influence of slurry swirling cannot be resolved, and in the treatment of water, at the outer peripheral speed of the stirring rotor 5 of 10 m / sec or more, air enters the cylindrical container from the slurry storage tank 6 and the slurry in the cylindrical container foams. Then, the slurry flow deteriorated and could not be processed.
  • slurry processing can be performed without bead leakage without the mechanical seal installed in the conventional bead mill.

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  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
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CN117160607A (zh) * 2023-08-30 2023-12-05 西安交通大学 一种涡轮式砂磨机

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