JP3143861U - Raw material powder grinding and mixing equipment - Google Patents

Abstract

Disclosed is a pulverizing and mixing device capable of pulverizing and mixing raw material powders over a long period of time without impairing the function of separating pulverizing balls and raw material powders to be pulverized.
A plurality of agitating blades 3 that are attached to a rotating shaft 2 that is driven to rotate are disposed, and a raw material powder is introduced together with a dispersion solvent into a pulverizing container 1 in which pulverizing balls 4 are placed. The pulverizing and mixing apparatus is configured to pulverize the raw material powder and the dispersion solvent together with the pulverizing ball by rotating the stirring blade 3 to pulverize the raw material powder and to disperse and mix the pulverized raw material powder in the dispersion solvent. The container 1 is provided with a separation / extraction port 5 for extracting the pulverized raw material powder together with the dispersion solvent to the outside, and the separation / extraction port 5 is provided with a separation plate 6 for separating the raw material powder and the balls for pulverization. . The separation plate 6 is formed with a separation portion having a plurality of holes for separating the raw material powder and the grinding balls 4.
[Selection] Figure 1

Description

  The present invention relates to a pulverizing and mixing apparatus for pulverizing and mixing ceramic powder, metal powder, or a composite powder thereof.

  Conventionally, a mixed powder of tungsten carbide powder, which is a ceramic powder, and cobalt powder, which is a metal powder of an iron group, is used as a material as a material that constitutes a cutting tool, a mold apparatus, and a mechanical component that constitutes an internal combustion engine or the like. Cemented carbide is used. This type of cemented carbide is manufactured by stamping or molding a mixed powder of tungsten carbide powder and cobalt powder with a press, pre-sintering, and further sintering.

  In such a mechanical part using a cemented carbide, high dimensional accuracy is required. In order to manufacture a mechanical component that requires such a high dimensional system, it is necessary to form a sintered body made of cemented carbide with high dimensional accuracy. In order to obtain a sintered body with high dimensional accuracy, it is necessary to prevent variations in characteristics from occurring in the cemented carbide constituting the sintered body.

  Therefore, the raw material powder constituting the cemented carbide is required to be a material having uniform characteristics. In order to eliminate such variation in the characteristics of the material powder, the raw material powder is pulverized and mixed using a pulverizing and mixing device in producing a cemented carbide sintered body.

For example, when forming a ceramic sintered body, a ceramic powder material as a raw material is pulverized and mixed using a pulverizing and mixing device such as an attritor mill (see Japanese Patent Application Laid-Open No. 2000-290073).
JP 2000-290073 A

  By the way, a pulverizing and mixing device for pulverizing and mixing ceramic powder, metal powder, or a composite powder of these, etc., rotates a stirring blade disposed in a pulverization container into which the raw material powder to be pulverized and mixed is placed. The raw powder charged in the pulverization container is pulverized and mixed by generating a shearing force by moving or colliding the pulverization balls previously charged in the pulverization container.

  In this type of pulverizing and mixing apparatus, a separation / extraction port for taking out the pulverized raw material powder from the pulverization container is provided, and in this separation / extraction port, pulverization balls used for pulverization and the pulverized raw material powder are provided. And a separation plate for separating the two. When the raw material powder is pulverized and mixed, the balls for pulverization and the raw material powder collide with or are pressed against the separation plate, causing remarkable wear. In particular, when the balls for grinding and the raw material powder to be ground are hard materials having high hardness, the wear becomes significant.

  When partial wear occurs on the separation plate, pulverization balls and raw material powder stay in the worn portion, which causes a significant decrease in the pulverization effect. Further, the separation hole provided in the separation plate expands or deforms due to wear of the separation plate, so that the ball for crushing is clogged and the separation function from the pulverized raw material powder is impaired.

  Therefore, the present invention does not easily impair the function of separating the pulverizing balls and the raw material powder to be pulverized, and pulverizes and mixes the raw material powders over a long period of time with high efficiency. An object of the present invention is to provide a pulverizing and mixing apparatus that can disperse and mix.

  Another object of the present invention is to provide a pulverizing and mixing apparatus useful for pulverizing and mixing raw material powders constituting a cemented carbide having extremely high hardness.

  Furthermore, an object of the present invention is to provide a pulverization and mixing apparatus that can perform maintenance easily and can realize a long life of the apparatus itself.

  The pulverizing and mixing apparatus according to the present invention proposed to solve the technical problems as described above is provided with a plurality of stirring blades that are attached to and rotated by a rotary shaft that is driven to rotate by a rotation driving means, and pulverized. The raw material powder and the dispersion solvent are stirred together with the pulverizing ball by rotating the stirring blades into the pulverization container in which the pulverizing ball is charged and rotating the stirring blade. A pulverizing and mixing device that pulverizes the powder and disperses and mixes the pulverized raw material powder in the dispersion solvent. The pulverization container has a separation for taking out the pulverized raw material powder together with the dispersion solvent. A take-out port is provided, and the separation take-out port is provided with a separation plate for separating the raw material powder and the grinding balls.

  The separation plate provided at the separation outlet is made of cemented carbide, and the separation plate is formed with a separation portion having a plurality of holes for separating the raw material powder and the grinding balls. .

  The separation part provided in the separation plate is formed by forming a plurality of separation holes formed in parallel as a plurality of long holes arranged in series at a constant interval with a plurality of separation holes formed as long holes. The separation holes constituting the adjacent long hole rows are shifted in the series direction and formed in the separation plate. The separation plate is detachably attached to the pulverization container.

  Further, the pulverization container is provided with a ball discharge port provided with a ball discharge valve made of cemented carbide for discharging the pulverization balls.

  Furthermore, a circulation pipe for leading the pulverized raw material powder taken out from the separation / outlet to the pulverization container is connected to the separation / outlet.

  The pulverizing and mixing apparatus according to the present invention reduces wear caused by collision of balls for pulverization or raw material powder to be pulverized by forming a separation plate provided at a separation outlet provided in the pulverization container with a cemented carbide. Since the separation function of the ball for pulverization and the raw material powder is not impaired over a long period of time, the raw material powder can be pulverized and mixed with high efficiency.

  In addition, since the raw material powder and the dispersion solvent are stirred together with the grinding balls and the raw material powder is pulverized and mixed, the material powder can be uniformly dispersed and mixed with high accuracy. Can be dispersed and mixed.

  Furthermore, by defining the arrangement of the plurality of long holes that constitute the separation portion provided in the separation plate, clogging of the grinding balls can be reliably prevented.

  Furthermore, since the separation plate can be replaced, the life of the device itself can be extended. Moreover, by forming the ball discharge valve that opens and closes the ball discharge port provided for exchanging the ball for pulverization with the cemented carbide, it is possible to prevent damage to the ball discharge valve due to the shearing force generated during the pulverization of the raw material powder, Longer life of the device itself can be realized.

  Furthermore, by allowing the circulation pipe to be connected to the pulverization container, circulation of the pulverized raw material powder is realized, and raw material powder that is pulverized and mixed more uniformly can be obtained.

  Embodiments of a pulverizing and mixing apparatus according to the present invention will be described below with reference to the drawings.

  The pulverizing and mixing apparatus of the present embodiment is used for pulverizing and mixing ceramic powder such as tungsten carbide powder, metal powder such as cobalt powder, or composite powder thereof, which is a material powder constituting the cemented carbide. As shown in FIG. 1, the pulverization / mixing apparatus includes a pulverization container 1 for pulverizing and mixing material powders.

  The crushing container 1 is provided with a plurality of stirring blades 3 attached to a rotating shaft 2 that is driven to rotate. The rotating shaft 2 to which the stirring blade 3 is attached is rotationally driven by a drive motor (not shown). The plurality of stirring blades 3 are attached so as to be displaced in the axial direction of the rotary shaft 2.

  Further, a grinding ball 4 is placed in the grinding container 1. The grinding balls 4 are formed of a cemented carbide having excellent wear resistance. When the material powder is pulverized and mixed, the pulverization container 1 is charged with alcohol, acetone or other dispersion solvent together with the material powder.

  A separation / extraction port 5 is provided at the bottom of the pulverization container 1 for taking out the pulverized raw material powder together with the dispersion solvent. The separation outlet 5 is provided with a separation plate 6 for separating the pulverized raw material powder from the pulverization balls 4. As shown in FIGS. 2 and 3, the separation plate 6 is formed in a disk shape from a cemented carbide excellent in wear resistance. A separation portion 8 having a plurality of holes 7 for separating the raw material powder and the grinding balls 4 is formed in the central portion of the separation plate 6. Specifically, as shown in FIG. 2, the separation portion 8 is formed as an elliptical long hole, and a plurality of separation holes 7 are arranged in series at regular intervals with the long axis P aligned. A plurality of rows of hole arrays are formed in parallel. Here, the separation holes 7 constituting the long hole rows adjacent to each other are formed in the separation plate 6 by shifting the positions in the direction in which the adjacent ones formed in parallel in the short axis direction are in series. Has been. Further, the separation hole 7 has a size that does not allow the grinding ball 4 to be fitted therein, and is formed as a long hole having the same size.

  The plurality of separation holes 7 constituting the separation portion 8 are formed so as to be crushed by being shifted in the direction in which adjacent ones formed in parallel in the minor axis direction are in series. It is possible to prevent the balls 4 from being aligned in a certain direction. As a result, reliable agitation of the grinding balls 4 can be realized, and stable raw material powder can be crushed. Furthermore, clogging of the separation unit 8 can be prevented, and the raw material powder can be stably taken out without causing clogging.

  Moreover, the separation plate 6 is detachably attached to the crushing container 1 through a flange portion 10 formed on the outer peripheral edge side. In other words, the separation plate 6 can be removed into the crushing container 1 by using the fixing screw inserted into the screw hole 10a formed in the flange portion 10 by locking the flange portion 10 to the peripheral edge of the separation take-out port 5. Is attached.

  Further, the separation outlet 5 is provided with a powder outlet 12 through an opening / closing valve 11, and the pulverized and mixed raw material powder is taken out from the powder outlet 12 together with the dispersion solvent. Although not shown, the powder take-out port 12 is connected to a circulation pipe for leading the taken-out raw material powder to the pulverization container 1 again so that the raw material powder is repeatedly pulverized.

  Furthermore, a ball discharge port 13 is provided on the bottom side of the pulverization container 1 to discharge the pulverization balls 4 so as to be parallel to the separation / extraction port 5. By providing the ball discharge port 13, the grinding balls 4 can be replaced in consideration of damage and the like, and the raw material powder can be crushed and mixed accurately. The ball discharge port 13 is provided with a ball discharge valve 14 that is opened only when the grinding ball 4 is discharged. The ball discharge valve 14 may be damaged by a shearing force generated by the pulverizing balls 4 generated when the raw material powder is pulverized, and may generate burrs or the like. Then, a protrusion such as a burr is formed on the ball discharge valve 14, so that there is a possibility that the grinding ball 4 cannot be taken out from the ball discharge port 13. Here, the ball discharge valve 14 is also formed of a cemented carbide excellent in wear resistance, so that the influence of shearing force generated during the pulverization of the raw material powder can be suppressed, and the occurrence of burrs and the like can be suppressed.

  An upper lid 15 is attached to the upper side of the pulverization container 1 to prevent scattering of pulverized raw material powder and the like. The upper lid 15 is provided with a raw material powder inlet 16 to which one end of a circulation pipe connected to the powder outlet 12 is connected.

  The pulverizing and mixing apparatus to which the present invention is applied is configured as a water-cooled type that cools the heat generated when the raw material powder is pulverized. Therefore, a cooling unit 17 into which cooling water is injected is provided around the pulverization container 1. Cooling water is supplied to the cooling unit 17 through a water inlet (not shown) so as to circulate.

  The crushing container 1 is fixed to the support base 20 via a connection support member 19 attached to the outer periphery. Although not shown, a rotational drive mechanism including a drive motor for driving the rotary shaft 2 is disposed on the support base 20.

  In order to pulverize and mix the raw material powder using the pulverizing and mixing apparatus configured as described above, the raw material powder is charged into the pulverizing container 1 from the raw material charging port provided in the upper lid 15. The grinding balls 4 are put in the grinding container 1 in advance. In addition, the dispersion solvent is introduced into the pulverization container 1 together with the raw material powder.

  Next, when the rotating shaft 2 is driven to rotate and the stirring blade 3 rotates, the pulverizing ball 4 stirs the raw material powder and the dispersed solvent in the pulverizing vessel 1. At this time, a shearing force is generated by the movement or collision of the grinding balls 4, and the raw material powder is crushed. Further, the crushing balls 4 are moved or collided by the rotation of the stirring blades 3 to repeat the crushing of the raw material powder and to disperse with the solvent or to mix the powder. The raw material powder is pulverized repeatedly to be pulverized so as to have a uniform size as a whole, and further mixed with a dispersion solvent.

  When the predetermined raw material powder is pulverized and mixed, the pulverized raw material powder is taken out from the powder take-out port 12 together with the dispersion solvent while the stirring blade 3 is rotated.

  When further refinement of the raw material powder and further pulverization and mixing are performed, a circulation pipe is connected to the powder take-out port 12, the open / close valve 11 is opened, and the raw material powder discharged from the powder take-out port 12 Is put into the crushing container 1 again to repeat crushing. The refeeding of the raw material powder crushing container 1 using the circulation pipe is performed while a suction pump is provided in the middle of the circulation pipe and suctioned by the suction pump.

  In the pulverization / mixing apparatus according to the present invention, the separation plate 6 provided at the separation / extraction port 5 is formed of cemented carbide, so that wear due to collision of the pulverization balls 4 and the raw material powder to be pulverized is reduced. It is possible to prevent the function of separating the ball 4 and the raw material powder from being impaired over a long period of time, and the raw material powder can be pulverized and mixed with high efficiency.

  Furthermore, the separation part 8 provided in the separation plate 6 can achieve the dispersion of the raw material powder permeated from the holes 7 and can realize stable extraction of the raw material powder without causing clogging.

  Therefore, by using the pulverizing and mixing apparatus according to the present invention, the material powder can be dispersed and mixed uniformly with high accuracy.

  The pulverizing and mixing apparatus according to the present invention can be used not only for pulverizing and mixing raw material powders constituting the cemented carbide as described above, but also widely used for pulverizing and mixing such as pharmaceuticals and paints.

It is sectional drawing which shows schematic structure of the grinding | pulverization mixing apparatus which concerns on this invention. It is a top view which shows the separation board arrange | positioned at a separation taking-out port. It is sectional drawing of a separating plate.

DESCRIPTION OF SYMBOLS 1 Crushing container 2 Rotating shaft 3 Agitation blade 4 Crushing ball 5 Separation take-out port 6 Separation plate 7 Separation hole 8 Separation part

Claims (5)

A plurality of stirring blades that are attached to and rotated by a rotation shaft that is driven to rotate by a rotation driving means are disposed, and a raw material powder is introduced together with a dispersion solvent into a pulverization container in which pulverization balls are charged. The raw material powder and the dispersion solvent are agitated together with the pulverizing ball, and the raw material powder is pulverized by the pulverizing ball, and the pulverized raw material powder is dispersed and mixed in the dispersing solvent. In the pulverized and mixed device,
The pulverization container is provided with a separation / extraction port for extracting the pulverized raw material powder together with the dispersion solvent to the outside, and the separation / extraction port is provided with a separation for separating the raw material powder and the pulverization balls. A board is provided,
The separation plate is made of a cemented carbide, and the separation plate is formed with a separation portion having a plurality of holes for separating the raw material powder and the grinding balls. A pulverizing and mixing device. The separation portion is formed by forming a plurality of separation holes formed in parallel, and a plurality of separation holes arranged in series at regular intervals with the long axis aligned, and a plurality of separation holes are formed in parallel.
2. The pulverizing and mixing apparatus according to claim 1, wherein the separation holes constituting the long hole rows adjacent to each other are formed in the separation plate with a position shifted in a series direction.   The pulverization and mixing apparatus according to claim 1, wherein the separation plate is detachably attached to the pulverization container.   2. The pulverizing and mixing apparatus according to claim 1, wherein the pulverizing container is provided with a ball discharge port provided with a ball discharge valve made of cemented carbide for discharging the pulverizing balls. .   2. The pulverization and mixing apparatus according to claim 1, wherein a circulation pipe for leading the pulverized raw material powder taken out from the separation and extraction port to the pulverization vessel is connected to the separation and extraction port.