JP6317891B2 - Dry media agitating crusher - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a dry media agitation type pulverizer that agitates and refines a granular material together with a pulverization medium, and in particular, dry media agitation that can be continuously pulverized and combined with a classification process. It relates to a mold crusher.

  The pulverization process using a dry media agitation type pulverizer is a process for refining the powder and granule using a shearing force and an impact force generated between the pulverized media to be stirred. The structure and function of the dry media agitation type pulverizer described in Patent Document 1 will be described with reference to FIG.

  The dry media agitation type pulverizer 110 is provided with a lower rotating shaft 31 that is vertically inserted through the bottom surface of a bowl-shaped and substantially cylindrical container 20, and the agitator 30 is attached to the lower rotating shaft 31. The agitator 30 includes a shaft member 32 and a plurality of stirring members 33. The container 20 is filled with the grinding media 40 to such an extent that the entire agitator 30 is buried.

  The raw material processed material that is a granular material is continuously or intermittently charged from the supply port 11 on the side of the container 20. Then, by rotating the agitator 30, the agitator 30 is stirred together with the grinding media 40 to form a mixed layer 81, and the grinding process is performed in the mixed layer 81. A gas is introduced into the container 20 from a plurality of locations, and the upper side of the mixed layer 81 is a conveyance unit 82 that conveys the processed material.

  Further, an upper rotary shaft 51 that is vertically inserted through the upper surface of the container 20 is provided, and a classification rotor 50 is attached to the upper rotary shaft 51. The classification rotor 50 is a classifier that includes classification blades 52 and allows gas to flow from the outside to the inside of the rotating classification blades 52. The processed product after the pulverization process is moved up the transport unit 82 by the air current and is subjected to the classification process when passing through the classification rotor 50.

  That is, when the gas passes through the classification rotor 50, the fine powder passes along with the gas, but the coarse powder receives a centrifugal force due to the rotation of the classification blade 52 and is prevented from passing. Fine powder that has passed through the classification rotor 50 is discharged from the discharge port 12 through the recovery pipe 53 to the outside of the machine. It will return and undergo pulverization again.

  Further, the dry media agitation type pulverizer 110 is provided with an annular path 54 so as to surround the classification blade 52 of the classification rotor 50, and gas is blown out from the guide blade 55 of the annular path 54 toward the classification blade 52 to agglomerate. It has a function to disperse and disperse the fine powder.

  In addition, a substantially cylindrical rectifying guide 60 having the same axis as the container 20 is provided immediately below the classification rotor 50 so that the cross section of the transfer section 82 is annular, and the flow of gas and processed material is restricted within this cross section. doing. The vertical portion of the recovery pipe 53 passes through the inside of the rectifying guide 60. A cylindrical tube 61 is further provided in a part of the conveyance section 82 having an annular cross section by the rectifying guide 60, and the flow path is divided into two in the radial direction.

  By the way, in the dry media agitation type pulverizer 110, gas is introduced into the container 20 from a plurality of locations. The line 91 is a line for introducing a gas used for the shaft seal of the lower rotating shaft 31. This prevents contaminants from entering the container 20 from the outside and the processed material from adhering to the sliding portion. Similarly, the line 92 is a line for introducing a gas used for the shaft seal of the upper rotating shaft 51.

  The line 93 is a line for introducing a gas that seals a gap formed between the lower surface of the classification rotor 50 and the upper surface of the rectifying guide 60. On the inside and outside of the classification rotor 50, the pressure is higher on the outside than on the inside. Therefore, in order to prevent the coarse powder from flowing toward the recovery pipe 53 from the gap between the rotating classification rotor 50 and the stationary rectifying guide 60, gas is introduced from the line 93 and sealed. As described above, the gas introduced through the lines 91, 92, and 93 is a gas for sealing.

  The line 65 is a line for introducing a gas into the mixed layer 81 and is intended to increase the pulverization efficiency in the mixed layer 81. That is, the residence time of the processed material in the mixed layer 81 is reduced by the gas introduced from the line 65, thereby preventing the processed material once pulverized from being coarsened as agglomerated powder in the mixed layer 81. Yes. The line 66 is a line for introducing a gas into the annular passage 54 surrounding the classification blade 52, and the pulverization efficiency is improved by breaking the agglomerated powder and pulverizing it immediately before the classification rotor 50.

JP 2003-265975 A

  However, the dry media agitation type pulverizer 110 has a drawback that the pulverization efficiency changes remarkably depending on the type of the processed material, and there is a problem that it is not always possible to optimally process various types of powder particles. . That is, while adjusting the amount of gas introduced into the line 65 and adjusting the rotational speed of the agitator 30 and the rotational speed of the classification rotor 50, optimum pulverization processing conditions are obtained. You can't get the results you can. In some cases, the pulverizing media 40 is significantly worn and cannot be prevented.

  Therefore, the object of the present invention is to solve the above-mentioned problems and cope with pulverization of a wide range of processed products, and a dry media agitation type pulverizer capable of obtaining excellent pulverization efficiency in each processing. Is to provide. Another object of the present invention is to provide a dry media agitation type pulverizer in which the pulverized media is less worn in any treatment.

  As a result of intensive studies to solve the above problems, the present inventors have clarified the following. First, the optimum conditions for pulverization depend on the residence time of the processed material in the mixed layer. This means that the mixing ratio of the processed material to the grinding media is important in the mixing layer. Secondly, the residence time of the processed product in the mixed layer depends on the amount of gas introduced into the mixed layer and greatly depends on the physical properties of the processed product. Third, the optimum conditions for pulverization depend on the behavior of the processed material in the transport section. That is, the pulverized processed product is preferably conveyed to the classification rotor at an optimum speed, and this also depends on the amount of gas passing through the conveying unit and the physical properties of the processed product. As a result of accumulating such knowledge, the present invention has been completed by solving conventional problems.

A dry media agitation type pulverizer according to claim 1 of the present invention is provided with an agitator attached to a lower rotating shaft positioned vertically at a lower portion of a container, and attached to an upper rotating shaft positioned vertically at the upper portion of the container. A classifying rotor is formed, and a conveying part is formed between the agitator and the classifying rotor, through which the gas introduced into the container flows, and the processed material introduced into the container is contained in the container. The mixed layer is formed by stirring with the agitator together with the pulverized media filled in advance, and the pulverization process is performed in the mixed layer. The fine powder that has been conveyed to the rotor and passed through the classification rotor together with the gas is discharged from the discharge port, and the coarse powder that has been blocked from passing by the classification rotor falls to the mixed layer. A dry medium stirring type grinder to be, directly under part of the classification rotor, the cross section of the conveying section is provided a generally cylindrical rectifying guides having the same axis and said container is annular, the agitator is , A shaft member and a plurality of stirring members provided radially projecting from the shaft member, wherein a part of the gas is introduced into the mixed layer, and another part of the gas is transported parts wherein is introduced toward the top of the rectification guide Oite said shaft member below the, employs the amount gas is adjustable respectively to be introduced into the gas volume and the conveying section is introduced into the mixing layer doing.

A dry media agitation type pulverizer according to claim 2 of the present invention is the dry media agitation type pulverizer according to claim 1, wherein the shaft member has a larger diameter than the lower rotating shaft. Is adopted.

Further, dry media agitation type pulverizer according to claim 3 of the present invention is a dry medium agitation type pulverizer according to claim 1 or 2, before Symbol outlet, below the the classification rotor Adopting the means of positioning.

Moreover, the dry media agitation type pulverizer according to claim 4 of the present invention is the dry media agitation type pulverizer according to any one of claims 1 to 3 , wherein the transport unit includes a cylindrical tube. A means is adopted in which a part of the conveying portion is divided in the radial direction by the cylindrical tube.

  The dry media agitation type pulverizer of the present invention can adjust the amount of gas introduced into the mixed layer 81 and the amount of gas flowing through the transport unit 82 by employing the above-described means. Optimal processing conditions can be set for a wide variety of processed products. Further, it is possible to set a high grinding efficiency for various processed products, and at the same time, it is possible to set processing conditions in which the grinding media is less worn.

It is explanatory drawing which shows typically the structure of the dry-type media stirring type grinder of this invention. It is a schematic sectional drawing which shows concretely the dry-type media stirring type grinder of this invention. FIG. 2 shows a method of introducing a gas different from that in FIG. 2, (a) is a method of introducing directly from the side wall of the container, and (b) is a method of introducing downward from the center of the container. It is explanatory drawing which shows typically the structure of the conventional dry media stirring type grinder.

  Embodiments of the present invention will be described below. FIG. 1 schematically shows a dry media agitation type pulverizer 10 of the present invention, similarly to the conventional dry media agitation type pulverizer 110 shown in FIG.

  That is, the dry media agitation type pulverizer 10 includes an agitator 30 attached to the lower rotary shaft 31 positioned vertically at the lower portion of the container 20, and is attached to the upper rotary shaft 51 positioned vertically at the upper portion of the container 20. A classification rotor 50 is provided, and a conveyance unit 82 through which the gas introduced into the container 20 flows is formed between the agitator 30 and the classification rotor 50.

  The agitator 30 includes a shaft member 32 and a plurality of stirring members 33. The container 20 is filled with the grinding media 40 to such an extent that the entire agitator 30 is buried. The raw material processed material that is a granular material is continuously or intermittently charged from the supply port 11 on the side of the container 20. Then, the mixed layer 81 is formed by stirring together with the grinding media 40 by the rotation of the agitator 30, and the grinding process is performed in the mixed layer 81.

  The classification rotor 50 is a classifier that includes classification blades 52 and allows gas to flow from the outside to the inside of the rotating classification blades 52. The processed product after the pulverization process is lifted by the gas and is subjected to a classification process when passing through the classification rotor 50. That is, when the gas passes through the classification rotor 50, the fine powder passes along with the gas, but the coarse powder receives a centrifugal force due to the rotation of the classification blade 52 and is prevented from passing. Fine powder that has passed through the classification rotor 50 is discharged from the discharge port 12 through the recovery pipe 53 to the outside of the machine. It will return and undergo pulverization again.

  The recovery pipe 53 is provided on the lower side of the classification rotor 50, but it can also be provided on the upper side. In this case, there is an advantage that the structure of the transport unit 82 can be simplified. However, since the upper rotary shaft 51 of the classification rotor 50 is inserted through the collection pipe 53 inside and outside the container 20, there are many difficulties.

  In addition, a substantially cylindrical rectifying guide 60 having the same axis as the container 20 is provided immediately below the classification rotor 50 so that the cross section of the transfer section 82 is annular, and the flow of gas and processed material is restricted within this cross section. doing. The vertical portion of the recovery pipe 53 passes through the inside of the rectifying guide 60. A cylindrical tube 61 is further provided in a part of the conveyance section 82 having an annular cross section by the rectifying guide 60, and the flow path is divided into two in the radial direction.

  The line 91 into which the gas is introduced is a line for introducing the gas used for the shaft seal of the lower rotary shaft 31. This prevents contaminants from entering the container 20 from the outside and the processed material from adhering to the sliding portion. Similarly, the line 92 is a line for introducing a gas used for the shaft seal of the upper rotating shaft 51. The line 93 is a line for introducing a gas that seals a gap formed between the lower surface of the classification rotor 50 and the upper surface of the rectifying guide 60. Inside and outside of the classification rotor 50, the pressure on the outside is higher than that on the inside, so that coarse powder is prevented from flowing toward the collection pipe 53 from the gap between the rotating classification rotor 50 and the stationary rectifying guide 60. In order to achieve this, gas is introduced from the line 93 and sealed. As described above, the gas introduced through the lines 91, 92, and 93 is a gas for sealing.

  The line 65 is a line for introducing a gas into the mixed layer 81 and is intended to increase the pulverization efficiency in the mixed layer 81. That is, the residence time of the processed material in the mixed layer 81 is reduced by the gas introduced from the line 65, thereby preventing the processed material once pulverized from being coarsened as agglomerated powder in the mixed layer 81. Yes. About the above structure, it is the same as the conventional dry-type media stirring type crusher 110. FIG.

  The dry media agitation type pulverizer 10 of the present invention is further characterized by including a line 67 for introducing a gas into the conveying unit 82. That is, not only can the amount of gas introduced into the mixed layer 81 be adjusted, but also the amount of gas flowing through the transport portion 82 can be adjusted. By this adjustment, the conveyance unit 82 can be set to an optimum conveyance state, and the mixed layer 81 can be further improved to a pulverized state by the optimum conveyance state.

  The gas introduced into the mixed layer 81 is the total amount of the gas for sealing by the line 91 and the gas introduced from the line 65. The fine powder generated by the pulverization process is discharged from the mixed layer 81 to the transport unit 82 by these gases. That is, in the mixed layer 81, the gas is finely dispersed in addition to the processed product and the grinding media 40. In a normal pulverization process, the gas to be introduced is air, but an inert gas is used as necessary.

  Since the gas introduced from the line 91 spreads uniformly from the lower surface of the shaft member 32 to the entire inside of the mixed layer 81, it can be introduced in a state preferable for the pulverization process. Therefore, it is preferable to introduce gas from the line 91 as much as possible. And the gas introduce | transduced from the line 91 can also be made into a fixed quantity, and can also be made adjustable.

  Since the gas introduced from the line 65 is introduced from the side wall of the container 20, the inside of the mixed layer 81 may be in a non-uniform state. Therefore, when a large amount of gas is introduced, it is preferable to introduce it in a dispersed manner from a plurality of locations. By adjusting the amount of gas from the line 65, the mixed layer 81 can be set to an optimum pulverization state.

  When the amount of gas introduced into the mixed layer 81 is too small, the chance that the processed product escapes from the mixed layer 81 is reduced, the residence time of the processed product is increased, and the ratio of the processed product to the grinding media 40 is increased. . In this case, the finely pulverized processed products tend to aggregate with each other and become coarse aggregated powder again, which is not preferable. And this tendency becomes so remarkable that the specific gravity of a processed material is large.

  When the amount of gas introduced into the mixed layer 81 is too large, the residence time of the processed material in the mixed layer 81 is shortened, and the ratio of the processed material to the grinding media 40 is decreased. If it does so, a processed material will be discharged | emitted from the mixed layer 81, without receiving a sufficient grinding process, and is unpreferable. And this tendency becomes strong, so that the specific gravity of a processed material is small. Furthermore, since the ratio of the processed material to the pulverized media 40 is reduced, the shearing force and collision force of the pulverized media 40 originally applied to the processed material are applied to each other, and the crushed media 40 is worn. Becomes intense.

  The gas introduced into the conveyance unit 82 is the sum of the gas introduced through the line 91 and the line 65 and discharged from the mixed layer 81 and the gas introduced through the line 67 which is a feature of the present invention. These gases must transport the processed material pulverized in the mixed layer 81 to the classification rotor 50. In order to convey the processed material, a high superficial velocity is required unlike the case where the processed material is discharged from the mixed layer 81 filled with the pulverization media 40.

  In addition to increasing the amount of gas, a contrivance has been made to improve the condition for conveying the processed material in the conveying section 82. For example, the flow rate is increased by reducing the cross-sectional area of the flow path, and the flow is made uniform so as not to cause turbulence. For this purpose, in the transport unit 82, the diameter of the container 20 is reduced, a cylindrical rectifying guide 60 is provided in the center to form an annular channel, and a cylindrical tube 61 is provided outside the rectifying guide 60 to reduce the diameter of the annular channel. Dividing in direction. Since the amount of gas passing through the classification rotor 50 is increased by introducing gas from the line 67, introduction of gas into the annular passage 54 described in the conventional example can be omitted. A specific form of the line 67 will be described later.

  As a result, the gas rising from the mixing layer 81 toward the classification rotor 50 has a fast flow rate inside the cylindrical tube 61 and a slow flow rate outside the cylindrical tube 61. Then, the pulverized processed product rises inside the cylindrical tube 61 along with the gas, and the coarse powder separated by the classification rotor 50 falls outside the cylindrical tube 61. In such an environment, an optimal conveyance state can be set by adjusting the amount of gas introduced from the line 67 and adjusting the total amount of gas rising up the conveyance unit 82.

  When the amount of gas rising up the transport unit 82 is too small, there is a disadvantage that the pulverized processed product cannot reach the classification rotor 50. Further, as a result of a decrease in the amount of the processed material transported in the transporting portion 82, the opportunity for the processed material to escape from the mixed layer 81 decreases, and a similar result is obtained when the amount of gas introduced into the mixed layer 81 is too small. In other words, the residence time of the processed product becomes longer, and the processed products once pulverized are aggregated with each other to become a coarsened powder again.

  Moreover, when there is too much gas amount which raises the conveyance part 82, the problem that the classification function of the classification rotor 50 falls will arise. In addition, as a result of an increase in the amount of processed material transported in the transport section 82, the number of opportunities for the processed material to escape from the mixed layer 81 increases, and the result is similar to the case where an excessive amount of gas is introduced into the mixed layer 81. That is, the processed material is discharged from the mixed layer 81 without being subjected to sufficient pulverization treatment, and the wear of the pulverization media 40 becomes intense.

  A specific example of the implementation of the present invention will be described with reference to FIG. In this dry media agitation type pulverizer 10a, the lower part of the container 20 in which the mixed layer 81 is formed is formed of ceramic. For example, when pulverizing a material of an electronic component, a ceramic material is used to avoid contamination by metal powder, and the lower portion of the container 20 in which the mixed layer 81 is formed, the agitator 30, the classification rotor 50, the pulverization media 40, etc. Is ceramic.

  The dry media agitation type pulverizer 10a is provided with a metal jacket outside the lower part of the ceramic container 20, and the mixed layer 81 can be cooled by circulating cooling water through the jacket. Moreover, the part which a processed material contacts can avoid contamination also by the method of coating the metal surface, and urethane rubber, a tetrafluoroethylene resin, etc. can be used.

  About the lower part of the container 20 in which the mixing layer 81 is formed, and the agitator 30, it is preferable to form a uniform mixed state as a simple shape as possible. In particular, it is preferable to reduce the speed difference due to the rotation of the stirring member 33, and it is preferable to increase the diameter of the shaft member 32. That is, the diameter of the shaft member 32 is preferably larger than the diameter of the lower rotating shaft 31 and is preferably about 50% of the diameter of the container 20.

  Moreover, it is preferable that the top part of the shaft member 32 is substantially conical. This is to smooth the surface to reduce wear and to avoid adhesion of the processed material and the grinding media 40. Further, the shape of the stirring member 33 is also preferably a simple shape. For example, a structure in which a round bar-shaped stirring member 33 is provided so as to protrude from the shaft member 32 is preferable.

  As for the line 65 and the line 91 which introduce | transduce gas into the mixed layer 81, it is preferable that gas is introduce | transduced equally as much as possible, and it is preferable to provide multiple lines 65 as needed. In particular, in the portion where the gas is introduced, the amount of processed material is locally reduced, and the ratio of the processed material to the grinding media 40 tends to decrease. And the problem that sufficient grinding | pulverization is not performed in the introduction part of gas and the problem that abrasion of the grinding | pulverization media 40 increases will be caused.

  It is preferable that the line 67 for introducing the gas into the transport unit 82 is introduced in the immediate vicinity of the upper boundary surface of the mixed layer 81. Further, it is preferable that the gas is introduced as evenly as possible to form a rectified flow in the entire conveyance unit 82. Specifically, it is preferable that the gas is introduced toward the top of the shaft member 32 and spreads from here to the entire flow path of the transport unit 82. If the rectification in the conveyance unit 82 is insufficient, the classification performance of the classification rotor 50 is deteriorated.

  As shown in FIG. 2, when the gas from the line 67 is introduced through the nozzle 71 provided inside the container 20, the rectifying effect can be enhanced by using a plurality of nozzles 71. Moreover, as shown in FIG. 3A, it is also effective to introduce directly from the side wall. For example, the introduction hole 72 may be provided in the flange portion for introduction.

  Moreover, as shown in FIG.3 (b), the umbrella-shaped introduction port 76 can also be formed in the upper part of the shaft member 32 whose top part is a triangular pyramid shape in the opposing state. That is, the gas from the line 67 is blown out from the introduction port 76 through the introduction pipe 75, and can spread uniformly over the entire conveyance unit 82 along the upper surface of the shaft member 32. In this case, various variations are prepared such that the height of the introduction port 76 with respect to the upper surface of the shaft member 32 can be adjusted, and a plurality of introduction ports 76 having different outer diameters can be prepared and exchanged. Is possible.

10 …… Dry media agitating crusher 12 …… Discharge port 20 …… Vessel 30 …… Agitator 31 …… Lower rotating shaft 32 …… Shaft member 33 …… Agitating member 40 …… Crushing media 50 …… Classifying rotor 54… ... annular passage 61 ... cylindrical tube 81 ... mixed layer 82 ... conveying section

Claims (4)

At the bottom of the container, equipped with an agitator attached to the lower rotating shaft located vertically,
The upper part of the container comprises a classification rotor attached to an upper rotary shaft positioned vertically,
Between the agitator and the classifying rotor, a transport unit through which the gas introduced into the container flows is formed,
The processed material put into the container is stirred with the agitator together with the pulverization media prefilled in the container to form a mixed layer, and pulverization is performed in the mixed layer,
The processed product after the pulverization process is transported to the classification rotor by raising the transport unit by the gas,
Fine powder that has passed through the classification rotor together with the gas is discharged from the discharge port,
The coarse powder blocked from passing by the classification rotor is a dry media agitation type pulverizer that falls and returns to the mixed layer,
Immediately below the classifying rotor, a substantially cylindrical rectifying guide having the same axis as the container is provided, and the cross section of the transport section is annular,
The agitator includes a shaft member and a plurality of stirring members provided radially projecting from the shaft member,
Some of the gas, the while being introduced into the mixing layer, another part of the gas is introduced towards the top of Oite the shaft member below the rectifying guides of the transport unit, the mixing A dry media agitation type pulverizer, wherein the amount of gas introduced into the layer and the amount of gas introduced into the transport unit are adjustable. The dry media agitation type pulverizer according to claim 1, wherein the shaft member has a larger diameter than the lower rotating shaft. The outlet, a dry medium agitation type pulverizer according to claim 1 or 2, characterized that you positioned below the classification rotor. Wherein a transport unit is a cylindrical tube, dry media stirring type milling according to any one of claims 1 to 3, wherein that you have been divided into two part diameter direction of the conveying section by the cylindrical tube Machine.