JP2017051929A - Batch type medium dispersion machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a batch type medium dispersion machine capable of atomizing grain size distribution of a sharp, by sharpening a staying distribution time, by increasing a circulation frequency, in a batch type medium dispersion machine for dispersively treating by circulating a treatment material in a tank and a vessel, by putting the vessel for storing a dispersion medium in the tank.SOLUTION: A plurality of disk blades 17 are closely adjacently provided in a vessel 8. The plurality of disk blades 17 suck a treatment material in the vessel 8 by generating the pump action of becoming a disk flow when rotating. The treatment material of entering into the vessel from an opening part of the vessel, is sucked in the axial direction by passing through a through-hole 18 provided in the disk blades, and flows in the radial direction along a plane of the disk blades, and is discharged from a screen 13, and is circulated in the tank.SELECTED DRAWING: Figure 1

Description

  In the present invention, solid particles in solid / liquid processing materials used in various fields such as chemistry, medicine, electronics, food, feed, and the like are made into fine particles using a dispersion medium (beads). With respect to a medium disperser adapted to disperse, in particular, a batch in which a dispersion medium is stored in a vessel, the vessel is placed in a treatment liquid in a tank, and the treatment liquid is circulated in the vessel to perform wet dispersion treatment. The present invention relates to a type media dispersing machine.

  A so-called batch medium disperser is known as an apparatus capable of performing intensive dispersion processing using a small number of dispersion media (see, for example, Patent Document 1). In the dispersion apparatus described in Patent Document 1, a vessel containing a dispersion medium is used as a container having an open top, and the bottom is used as a screen. There is also known an apparatus in which the entire vessel is formed into a casing having a screen. In such a vessel, when the opening area of the screen is reduced, the circulating flow rate of the processing material is reduced, and clogging may occur. If the opening area of the screen is increased, the dispersion medium may flow out, and a small-diameter dispersion medium cannot be used. In addition, the abrasion of the screen due to the dispersion medium increased, which caused the wear resistance to deteriorate.

  The batch-type media disperser rotates the stirring blade provided in the vessel with the dispersion medium by stirring the processing material that has entered the vessel, causes the processing material to flow out of the vessel into the tank, and this processing material is again sent to the vessel. It is configured to repeat the distributed processing by circulating it. In addition, a configuration is also known in which a processing agitation blade is provided in a tank or an opening of a vessel to feed a processing material into the vessel. However, in such a configuration, it is difficult to increase the flow rate of the processing material flowing into the vessel only by rotating the feeding stirring blade. Therefore, in the conventional batch-type medium disperser, the number of times the processing material passes through the vessel is small, and the distribution of the residence time of the processing material in the vessel tends to be broad. According to Ritchinger's law, in the dispersion by the bead mill (medium disperser), if the residence time distribution of the processing material in the bead mill is sharp, the particle size distribution of the fine particles obtained by the dispersion may be sharp. Are known. Therefore, it is difficult to obtain particles having a sharp particle distribution when the residence time distribution is broad as in the prior art.

  Further, the stirring blade described in Patent Document 1 is a pin type blade, but such a pin type blade has a shear rate at the blade tip portion that is inferior to that of a disk blade, so that the particles are efficiently finely divided. Hateful. A structure is also known in which a stay bolt is provided on the screen portion of the vessel and the screen and the bottom portion are assembled. However, in such a configuration, when the screen portion is cleaned, the stay bolt portion stagnate with the processing material, which makes it difficult to clean and has a problem in cleaning properties.

JP-A-11-244679 (Claim 1, FIG. 1)

  A solution of the present invention is to provide a batch type medium disperser in which a dispersion medium is accommodated in a vessel, and the vessel is immersed in a treatment liquid of a tank and a treatment material is circulated in the tank and the vessel to perform dispersion treatment. It is an object of the present invention to provide a batch-type medium disperser in which a treatment material can be flowed at a large flow rate, the number of circulations is increased, the residence time distribution is sharpened, and the particle size distribution is sharpened.

  Another object of the present invention is to provide the above-mentioned batch-type medium disperser which is easy to be washed and hardly clogged.

According to the present invention, in a batch-type medium disperser that disperses a vessel containing a dispersion medium by immersing it in a treatment liquid in a tank, the vessel has an opening opening at the top and a flow hole through which the dispersion medium does not pass. A cylindrical screen having a bottom plate having no flow holes, a rotating shaft extending into the vessel from the opening, and a plurality of disk blades connected to the rotating shaft in the vessel, the plurality of circles The plate blade has a through-hole, and when it rotates, the flow of the processing material passing through the through-hole becomes a radiant flow that sucks the processing material into the vessel and pumps it by the disk flow that is discharged to the outer periphery of the disk blade. A batch media disperser characterized in that it is provided in close proximity to occur is provided to solve the above-mentioned problems.

  In the present invention, the screen and the bottom plate are integrally connected, and a plurality of axial flow stirring blades are provided in the tank so that the processing material in the tank generates an axial flow and flows in the tank. A batch media disperser is provided.

  Since the present invention is configured as described above and a plurality of disk blades are provided close to each other so as to produce a pumping action that causes a disk flow in the vessel, when the disk blades are rotated by the rotation shaft, the processing is performed from the opening of the vessel. The suction action that positively sucks the material into the vessel occurs, and when it hits the lower disk blade through the through hole, the flow of the processing material flows in the radial direction as a radiant flow along the plane of the disk blade. Is discharged from the screen into the tank. During this time, the treatment material is stirred together with the dispersion medium, so that the formation of fine particles by dispersion proceeds. The processing material discharged into the tank is positively sucked into the vessel again by the pumping action and dispersed. Since the processing material is sucked and discharged by the pump action generated in the vessel in this way, the flow rate of the processing material sucked and discharged into the vessel can be set to a large flow rate. As a result, the number of circulations of the processing material passing through the vessel can be increased, the residence time distribution becomes sharp, and fine particles with a sharp particle size distribution can be obtained.

  Furthermore, if a plurality of axial flow agitating blades that generate an axial flow are provided in the tank, the flow of the processing material in the tank can be a downward flow or an overall flow. Therefore, the flow rate of the processing material sucked into the vessel can be further increased, and the above-described effect due to the large flow rate can be enhanced. At this time, if a plurality of stirring blades for axial flow are made into paddle blades that generate laminar flow, and one of them is a scraping flow (downflow) and the other is a scraping flow (upflow), the entire flow in the tank Thus, the number of circulations is further increased, the residence time distribution becomes sharp, the dispersion rate can be shortened, and a sharp particle size distribution can be obtained. Moreover, by using a disk blade, the shear rate of the blade tip becomes 1.5 times or more that of the pin type blade, and the dispersion effect can be enhanced. When the screen and the bottom plate are integrally connected, there is no obstacle around the vessel that causes stagnation in the flow of the processing material at the time of cleaning, and the cleaning performance can be improved.

The side view which showed one Example of this invention and was partially cut. Sectional drawing which shows one Example of a disk wing | blade. The top view which carried out the cross section of a part which shows one Example of a disk wing | blade. The top view which shows a gap | interval member. FIG. 5A is a cross-sectional view, FIG. 5B is a plan view of an upper disk wing in FIG. 5A, FIG. 5C is a plan view of an intermediate disk wing in FIG. 5A, and FIG. FIG. 5B is a plan view of the lower disk wing in FIG. 5A. FIG. 6A is a cross-sectional view, FIG. 6B is a plan view of an upper disk wing in FIG. 6A, and FIG. 6C is a plan view of an intermediate disk wing in FIG. 6A. 6D is a plan view of the lower disk wing in FIG. 6A. FIG. 7A is a cross-sectional view, FIG. 7B is a plan view of an upper disk wing in FIG. 7A, and FIG. 7C is a plan view of an intermediate disk wing in FIG. FIG. 7D is a plan view of the lower disk wing in FIG. 7A.

  FIG. 1 shows an embodiment of a batch-type medium disperser according to the present invention. A frame 4 is provided above a main body 1 so as to move up and down while being guided by a guide shaft 3 by a lifting shaft 2. A tank 5 containing a processing material is carried under the frame 4 and is held at a fixed position by a holder 6. Around the tank 5, a tank jacket 7 for circulating a temperature control medium such as cooling water is provided.

  A vessel 8 containing a dispersion medium, preferably a high specific gravity dispersion medium (not shown) is placed in the tank 5. The vessel 8 has an upper jacket 9 through which a temperature control medium such as cooling water flows, and is provided below the frame 4 by a water pipe combined stay 10 that also serves as a flow path for the temperature control medium. In the upper part of the vessel 8, a partition wall 11 that is inclined toward the inside of the vessel through the upper jacket 9 is provided, and an opening 12 that opens at the center thereof is formed.

  Around the vessel 8 below the upper jacket 9, there is a screen 13 having small holes, slits, meshes, and other flow holes that are large enough to allow the processing material to pass through, but not through the high specific gravity dispersion medium housed in the vessel. It is detachably connected. A bottom plate 14 having no flow holes is provided below the screen 13, and the bottom plate 14 and the screen 13 are provided with appropriate connection portions (not shown) such as flanges, and fastening devices such as bolts and rivets. It is connected integrally by fixing with. It is preferable to prepare a plurality of screens having flow holes of appropriate sizes so that the screens can be replaced with screens having different flow hole sizes depending on the dispersion medium. The bottom plate may be provided with an outlet (not shown) for taking in and out the dispersion medium.

  A rotating shaft 15 hanging downward from the frame 4 is inserted into the opening 12 of the vessel 8, and the rotating shaft 15 is driven by a drive motor 16 provided on the frame 4. A plurality of disc blades 17 are provided at the lower end of the rotating shaft 15 extending into the vessel 8. In the embodiment, three disk blades 17 are used. However, the disk blades 17 may be composed of two or more disk blades, and have through holes 18 of an appropriate size at appropriate positions or through holes. Includes disc wings without holes. The plurality of disk blades 17 are provided close to each other so as to produce a pumping action by disk flow when rotated. That is, when the disk blade 17 is rotated, the processing material that has flowed in the axial direction through the through hole 18 becomes a radial flow of the disk blade in the radial direction and flows along the disk surface. It discharges in the outer periphery direction of a wing | blade, and returns in the said tank through the through-hole of the said screen. Due to such a flow, a positive suction and discharge action is generated by the disk blade. Such a pumping action is a known rotary in which fluid is discharged in the radial direction of the disk blade using the frictional force or centrifugal force action of the fluid in contact with the surface of the disk blade, and the fluid is sucked accordingly. This is known as a disk type pump. Therefore, if the distance between the disk blades 17 is too wide, the pumping action does not occur. Therefore, the plurality of disk blades 17 are held close to each other by being held by the gap members 19.

  As shown in FIGS. 3 and 4, the gap member 19 is formed to have a substantially rectangular cross section, and the inner end surface 20 facing the center of the disk blade 17 is formed narrow, and both ends of the inner end surface 20 are connected to each other. Of the two side surfaces, one side surface 21 is formed in a straight line, and the other side surface 22 is provided with a slope. With this configuration, when the disc blade rotates in the counterclockwise direction in FIGS. 3 and 4, the discharge of the processing material is promoted and the discharge amount can be increased. One of the corners of the outer end surface 23 is an arc surface, and the other is a corner. As shown in FIG. 2, the flat portion of the gap member 19 is provided with a convex portion 25 that engages with the concave portion 24 provided in the disc blade 17. The plurality of disk blades 17 are overlapped with the gap member 19 interposed therebetween and fixed with bolts 26.

  Comparing the shear rate between the above-mentioned disk blade 17 and the tip of the conventional pin type blade, the disk blade is about 1.5 times larger than the pin type blade, and as a result, the dispersion processing is accelerated. Can do. The surface of the flat portion of the disk blade 17 may be flat, but the pin 27 may be provided in consideration of the particle diameter and hardness of the processing material. More preferably, a pin 27 is provided on the outer peripheral portion of the disc blade 17 so that the dispersion medium easily gathering on the outer peripheral portion of the disc blade 17 can be given an impact force and diffused. In the embodiment shown in FIG. 2, this pin stands upright on the upper or lower surface of the disk wing, but the pin may protrude horizontally on the outer periphery of the disk wing 17 (not shown). ). Instead of the pin, a convex portion or a concave portion may be formed on the flat surface of the disk blade to give an impact to the dispersion medium (not shown).

  As described above, the plurality of disk blades 17 rotate in the vessel 8 so that the processing material can be sucked into the vessel 8 by a pump action. In the embodiment, however, the processing material is more actively put into the vessel. Feeding (suction) means are provided for feeding. In FIG. 1, a screw 28 is provided around the rotary shaft 15 located in the opening 12 of the vessel 8 as a feeding means. When the rotating shaft 15 rotates, the processing material is guided (inhaled) into the vessel 8 by being guided by the screw 28. In place of the screw, an axial flow turbine blade, a paddle blade, or other infeed blades may be used as an infeed means (not shown).

  As described above, the disc blade 17 can be provided with the through holes 18 at appropriate positions. FIGS. 5 to 7 are explanatory views showing examples of combinations of disk blades having various through holes or no through holes. The embodiment shown in FIGS. 5A to 5D has three disc blades. As shown in FIG. 5B, four through holes 31 are formed in the upper disk blade 29 around the attachment portion 30 for connection to the rotating shaft 15. Similarly to the upper disk blade 29, the intermediate disk blade 32 is provided with four through holes 33, and the lower disk blade 34 is not provided with a through hole. In this configuration, the processing material sucked in the axial direction through the opening 12 by the pumping action of the disk blades 29, 32, and 34 passes through the through holes of the upper disk blade and the intermediate disk blade, The processing material hitting the lower disk wing flows in the radial direction along the plane of the lower disk wing.

  In the case of the embodiment shown in FIG. 6A, the upper disk blade 35 and the intermediate disk blade 36 are formed with large through holes 37 and 38 that are concentric with the disk blade and surround the rotating shaft 15. The lower disk wing 39 is provided with a mounting portion 30 of the rotating shaft, but no through hole is formed. Also in this case, the processing material flows by being sucked and discharged by the pumping action in substantially the same manner as the embodiment shown in FIG. 5A.

  In the case of the embodiment shown in FIG. 7A, the upper disk blade 40 is provided with a rotating shaft mounting portion 30 and four through holes 41 as shown in FIG. 7B. The intermediate disk blade 42 and the lower disk blade 43 are provided with large through holes 44 and 45 concentric with the disk blade. In the case of this embodiment, when the disk blades 40, 42, 43 rotate, the processing material fed from the opening 12 flows in the axial direction, and the processing material hitting the bottom plate 14 penetrates the lower disk blade 43. The air is sucked from the hole 45, enters the space between the intermediate disk blade 42 and the lower disk blade 43, and flows in the radial direction along the plane of each disk blade.

  Referring to FIG. 1, a plurality of axial flow stirring blades 46 such as paddle type stirring blades are provided between the vessel 8 and the tank 5 so as to give an axial flow to the processing material in the tank. The axial flow stirring blade 46 is rotated by a rotating shaft 47 and a driving motor 48 suspended from the frame 4. Although two paddle type stirring blades are shown in FIG. 1, three or more paddle type stirring blades may be provided at equal intervals so as to surround the vessel. This axial flow agitating blade 46 can generate an upward flow or a downward flow in the tank depending on the shape and rotation direction of the paddle, and is accordingly driven according to the flow characteristics of the processing material. be able to. For example, if all the axial flow stirring blades 46 are made to be paddle type blades, the flow rate of the processing material flowing into the vessel can be increased by laminar flow in the tank. Further, when one axial flow stirring blade is used as a paddle blade and the other is used as a paddle blade, the flow in the tank becomes a relative circulation flow, and an overall flow without causing stagnation in the processing material is obtained.

  Thus, the high specific gravity dispersion medium is placed in the vessel 8 and the vessel is submerged in the tank so as to be below the liquid level of the tank 5 containing the processing material. When the drive motors 16 and 48 are rotated, the rotary shafts 15 and 47 are rotated via a rotation transmission mechanism (not shown). By this rotation, the processing material in the tank flows and is fed into the vessel by the screw 28 provided on the rotating shaft 15. Further, since the disk blade 17 in the vessel exhibits a pumping action by rotation, the processing material is actively sucked into the vessel from the opening 12 of the vessel 8. The treatment material entering the vessel is stirred and dispersed together with the dispersion medium. The dispersed processing material is discharged from the vessel 8 into the tank 5 through the screen 13 by the discharge action by the pump action of the disk blade 17. The processing material that has come out of the vessel is sucked into the vessel 8 again through the opening 12 by the pumping action of the screw 28 and the disc blade 17 and is dispersed to a desired level. At this time, the heat generated in the vessel 8 and the tank 5 is cooled by cooling water passing through the tank jacket 7 and the upper jacket 9 provided in the vessel 8. Depending on the treatment material, warm water can be used as a temperature control medium.

  As described above, the batch-type media disperser of the present invention causes a pumping action to be a disk flow in the vessel by rotating a plurality of disk blades, and ensures that the processing material is reliably and at a large flow rate. By sucking into the vessel and increasing the circulation number of the processing material, the residence time distribution can be sharpened, and dispersion processing with a sharp particle size distribution can be performed.

5 Tank 7 Tank Jacket 8 Vessel 9 Upper Jacket 12 Opening 13 Screen 14 Bottom Plate 15 Rotating Shaft 17 Disc Blade 18 Through Hole 19 Gap Member 28 Screws 29, 35, 40 Upper Disc Blade 32, 36, 42 Intermediate Disc Blade 34, 39, 43 Lower disk blade 46 Agitating blade for axial flow

Claims (7)

  In a batch-type medium disperser in which a vessel containing a dispersion medium is immersed in a treatment liquid in a tank to disperse the vessel, the vessel has a cylindrical screen having an opening opening at the top and a circulation hole through which the dispersion medium does not pass. A rotating shaft extending into the vessel from the opening, and a plurality of disc blades connected to the rotating shaft in the vessel, the plurality of disc blades having through holes; The flow of the processing material through the through hole when it is rotated becomes a radiant flow, and the processing material is sucked into the vessel and is provided close to generate a pumping action by a disk flow that is discharged to the outer periphery of the disk blade. A batch type media disperser characterized in that   The batch type media disperser according to claim 1, wherein the plurality of disk blades are connected via a gap member, and the gap member has an inner end face inclined.   The batch type media disperser according to claim 1, wherein the disc blade is provided with a pin.   The batch-type medium disperser according to claim 1, wherein the cylindrical screen having the circulation holes and the bottom plate not having the circulation holes are integrally connected.   2. The batch type media disperser according to claim 1, wherein an axial flow stirring blade is provided in the tank so that the processing material in the tank generates an axial flow and flows in the tank.   The axial flow agitating blades are paddle type blades, and at least one of the axial flow agitating blades is provided with a plurality of descending flows that scrape the processing material in the tank, and the other axial flow agitating blades are caused to generate an updraft. The batch type media disperser according to claim 5.   The batch type media disperser according to claim 5, wherein the agitating blade for axial flow is a paddle type blade that generates a downward flow for scraping the processing material in the tank.

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