JP6629054B2 - Impeller unit and pulverizing device having the impeller unit - Google Patents

Description

  The present invention relates to a pulverizing device for pulverizing a material to be processed by collision of materials to be processed, which are solid raw materials, with an airflow generated by an impeller rotating at a high speed, and an impeller unit mounted on the pulverizing device.

  BACKGROUND ART Pulverizing devices for pulverizing raw materials such as agricultural products and minerals have been widely put into practical use in the industrial world. This pulverizing device is a machine that reduces the particle size by crushing the material to be treated, which is a solid raw material, and increases the specific surface area, which is the surface area per unit volume. Such pulverizers include a dry type in which the material to be processed is processed as it is and a wet type in which a predetermined liquid is added to the material to be processed. Of these, dry-type pulverizers are widely used because of the advantage that when a pulverized product is used in a dry state, it is not necessary to dry a liquid added after the pulverization.

  Here, when the material to be treated is pulverized, it is necessary to apply various external forces such as compression, shear, impact, and friction to the material to be treated. As a typical machine for applying an external force to a material to be processed, an impeller-type pulverizer is known. In such an impeller-type crushing apparatus, while rotating the impeller at a high speed in the crushing chamber, a powder as a material to be processed is put in an airflow in the crushing chamber to collide the powders and pulverize by the impact, There is a type in which the powder is collided with a high-speed rotating blade, or the powder is blown off by centrifugal force in the direction of the inner wall surface of the crushing chamber to be scattered and collided with the inner wall surface of the crushing chamber, and crushed by the impact. As a result, the powder as the material to be treated gradually becomes finer (fine particles). In addition, the powder is subjected to a fluid shear force by flowing into a minute clearance between the blade tip of the blade and the inner wall surface of the side surface due to the centrifugal force due to the rotation, or the powder is physically sheared and crushed. Is promoted.

  With respect to the above-described pulverizing apparatus, for example, techniques disclosed in Patent Literature 1 and Patent Literature 2 described below are known. That is, in Patent Literature 1, the raw material input port communicating with the pulverizing chamber via the first discharge type rotor is provided on one side of the casing, and the other side of the casing 1 is provided on the other side via the second discharge type rotor. It is disclosed that by providing discharge ports that communicate with each other, the area or volume of the pulverizing chamber can be increased to provide a pulverizer with excellent pulverization efficiency. On the other hand, Patent Document 2 discloses that maintenance efficiency is improved by a crushing device having a wing member detachably fitted to a rotating shaft.

JP-A-11-300224 JP 2013-702A

  As pointed out in Patent Document 1 mentioned above, it is important to improve the pulverizing efficiency in that the unit price of the product can be reduced and high competitiveness can be exhibited. Particularly, as represented by industrial applications, some powders to be processed have a high hardness, and if such powders are processed, the degree of damage to the rotating blade increases. However, not only the above-mentioned Patent Literature 1 and Patent Literature 2 but also the currently proposed technology does not yet satisfy the market needs, and has the following problems.

  That is, according to Patent Literature 2, since the wing member is externally fitted to the boss 20, the wing member may be removed from the boss at the time of maintenance, and the maintenance can be performed relatively easily. However, this wing member has an integral structure of the blade at the tip that collides with the powder, and if some of the blades are still usable, but the other blades are heavily worn, all blades must be replaced. Become. Further, since the use of the crushing device is very wide and wide from agriculture to industry, there may be a need to attach and detach each blade. On the other hand, in Patent Literature 2, since the blade at the tip end of the wing member has an integral structure, such needs cannot be satisfied.

  The present invention has been made in view of the above-described problem as an example, and is different from the structure of a conventionally proposed pulverizing apparatus, according to the material to be processed while realizing high pulverization efficiency and simple maintenance. It is an object of the present invention to provide an impeller unit whose function can be easily changed by using the impeller unit and a pulverizing device provided with the impeller unit.

In order to solve the above-mentioned problems, an impeller unit according to an embodiment of the present invention includes: (1) a main body board formed of metal and having a plurality of concave portions formed radially outward and formed on a peripheral edge thereof; A plurality of blades, each of which is made of a sintered body of an inorganic compound different from the above, and at least a part of which is disposed in each of the concave portions, wherein the concave portions are spaced apart from each other in a radial direction from a center of the main body board. The tapered recess gradually narrows, and the width in the circumferential direction of the blade gradually narrows as the distance from the center of the main body plate in the radial direction increases, so that the radial movement in the tapered recess is suppressed. Do Ri, the end surface facing said recess of said blade, characterized that you have holes of a predetermined depth is provided toward a direction away in the radial direction.

  In the impeller unit of the above (1), (2) the adjusting member which presses the blade along the radial direction in the tapered concave portion so as to face the side surface of the blade positioned in the concave portion. Is preferably arranged. In the impeller unit of (2), it is preferable that (3) a plurality of the adjusting members are arranged in the recess in a direction parallel to a rotation axis of the main body board. Further, in the impeller unit according to any one of the above (1) to (3), (4) the metal includes carbon steel, and the sintered body of the inorganic compound includes alumina ceramic to which zirconia is added. Is preferred.

( 5 ) In the impeller unit according to ( 1 ), ( 5 ) an end of the blade that is away from the radial direction in the blade is related to a direction parallel to a rotation axis of the main body board as the distance from the radial direction increases. A notch with a gradually decreasing thickness is provided, and the hole is eccentrically provided on a side opposite to a side where the notch is provided with respect to a center of the blade in a direction parallel to the rotation axis. Is preferred.
In order to solve the above problems, a pulverizing device according to an embodiment of the present invention includes an impeller unit according to any one of the above (1) to ( 5 ), a casing accommodating the impeller unit, and a casing in the casing. And a driving device for rotating the accommodated impeller unit .

  According to the present invention, the blades are arranged in the plurality of tapered recesses formed around the main body board, and the blades are fitted in the recesses in the circumferential direction. Thereby, it is possible to perform the minimum necessary maintenance according to the state of each blade, and it is also possible to equip the main body with blades having different functions or performances depending on the type of powder. . As a result, it is possible to realize an impeller unit whose function can be easily changed according to a material to be processed while realizing high crushing efficiency and simple maintenance, and a crusher equipped with the impeller unit. Further, although the ceramic, which has a lower specific gravity than metal, is partially used, the weight of the entire impeller unit can be reduced, and the impeller can be rotated at a higher speed in the future.

FIG. 2 is an external view illustrating a crusher 100 including an impeller unit 13 according to the first embodiment. FIG. 3 is a cross-sectional view illustrating details of a crushing chamber 20 that accommodates the impeller unit 13 according to the first embodiment. FIG. 2 is a perspective view illustrating an appearance of an impeller unit 13 according to the first embodiment. FIG. 3 is a diagram illustrating a structure of an impeller unit 13 according to the first embodiment. It is a perspective view showing appearance of blade 133 in a 1st embodiment. It is a figure explaining the structure of the impeller unit 23 in 2nd Embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described. For convenience of description, an X direction and a Y direction in each figure, and a height direction orthogonal to the X direction and the Y direction are respectively set as a Z direction. However, the definitions of these directions and the radial and circumferential directions used in the description are not used to limit the scope of the claims. Although a dry-type pulverizer is described below as an example of the pulverizer, the present invention is also applicable to a so-called wet-type pulverizer.

[First Embodiment]
FIG. 1 is an external view showing a crusher 100 including an impeller unit 13 according to the first embodiment of the present invention. As shown in FIG. 1, the crushing device 100 includes a crusher 10, a feeder 20, a suction device 30, and a collection device 40. Such a pulverizing system 100 is for pulverizing a raw material P as a material to be treated to an extremely small size.

  Examples of such raw materials P include grains such as wheat, tea such as tea leaves, food waste, seasonings such as rock salt, fine cosmetic materials, and industrial materials such as metal powder and carbon (carbon) powder. Electronic materials; Except for the configuration described in detail below, the configuration of a known pulverizer such as, for example, JP-A-11-300224 or JP-A-2013-702 can be used as appropriate.

  As the feeder 20, a known mechanism for supplying the raw material P to the crusher 10 is applied. The raw material P supplied from the feeder 20 is supplied to a pulverizing chamber 11b in the pulverizer 10 through an inlet 11a described later. The suction device 30 is connected to a negative pressure source (not shown), and has a function of sucking the crushed material Q from the crushing chamber 11b of the crusher 10. The crushed material Q sucked by the suction device 30 is discharged to the outside of the crushing chamber 11b through a discharge port 11c described later. The recovery device 40 has a function of recovering the crushed material Q discharged to the outside of the crushing chamber 11b through the discharge port 11c. Examples of the collection device 40 include a known collection device having a collection container such as a collection tray and a tank (not shown).

  Next, the details of the crusher 10 will be described with reference to FIG. The crusher 10 has a function of crushing the raw material P as the material to be processed into small pieces and discharging the crushed material Q to the outside, and includes a casing 11, a support mechanism 12, an impeller unit 13, a connecting portion 14, and a rotating shaft 15. It is composed of As described later, in the present embodiment, the direction in which the axis RA of the rotating shaft 15 of the crusher 10 extends extends in the Z direction, which is the vertical direction. However, the present invention is not limited to this mode, and the direction in which the axis RA of the rotating shaft 15 extends may be a horizontal direction (parallel to the X direction), or may be a direction crossing the X direction or the Z direction.

  The casing 11 includes an inlet 11a, a crushing chamber 11b, and an outlet 11c. In this embodiment, the casing 11 includes a first casing 111 having an outlet 11c and a second casing 112 having an inlet 11a. The shapes of the first casing 111 and the second casing 112 are bowl-shaped, and a space is formed inside the first casing 111 and the second casing 112 when the opening portions of the casings match each other.

  The charging port 11a is a circular opening having a predetermined diameter formed for charging the raw material P into the grinding chamber 11b. The inlet 11a communicates with the pulverizing chamber 11b via a pipe or the like in the casing 11. In the present embodiment, the input port 11a is a circular opening, but is not limited to this, and may be, for example, an elliptical or rectangular opening.

  The crushing chamber 11b is a room including a space for crushing the raw material P, and is a space formed by combining the first casing 111 and the second casing 112 as described above. At this time, the first casing 111 and the second casing 112 are fixed to each other via a known fastening material such as a screw. In other words, the first casing 111 and the second casing 112 form the crushing chamber 11b.

  In addition, as shown in FIG. 2, the first casing 111 has a first inner surface 111a. The first inner surface 111a is inclined with respect to the axis RA so as to move away from the axis RA as it approaches the second casing 112. In addition, a part of the crushing chamber 11b is formed by the first inner surface 111a. The first casing 111 has a through hole 111b through which the axis RA passes through the center thereof. A rotating shaft 15 described later is rotatably inserted into the through hole 111b.

  The second casing 112 has a second inner surface 112a. The second inner surface 112a is inclined with respect to the axis RA so as to move away from the axis RA as it approaches the first casing 111. Note that a part of the crushing chamber 11b is also formed by the second inner surface 112a. Further, in the present embodiment, the first inner surface 111a and the second inner surface 112a are symmetric with respect to a reference line XL located at an equal distance from these surfaces.

  The discharge port 11c is a circular opening having a predetermined diameter and formed to discharge the crushed material Q generated by crushing the raw material P from the crushing chamber 11b. The outlet 11c is provided on the opposite side of the second casing 112 from the connection portion with the first casing 111, and communicates with the above-described pulverizing chamber 11b. In other words, the outlet 11c of the present embodiment is formed in the second casing 112 of the casing 11. In the present embodiment, the outlet 16 is a circular opening, but is not limited to this, and may be, for example, an elliptical or rectangular opening.

The support mechanism 12 is a member for supporting the casing 11. Such a support mechanism 12 is formed of, for example, a metal such as S45C, and in the present embodiment, includes a tubular member 12a and a support plate 12b.
The tubular member 12a is fixed to the casing 11 via a known fastening material. In the present embodiment, the cylindrical member 31 has a cylindrical shape, and has a through hole formed in the direction of the axis RA (Z direction).

  A plurality of support plates 12b are arranged along the circumferential direction of the cylindrical member 12a, and each support plate 12b stands upright in the Z direction. This makes it possible to support the cylindrical member 12a and the casing 11 fixedly arranged above the cylindrical member 12a without falling down. In the present embodiment, each of the plurality of support plates 12b has a right-angled triangular main surface, but the present invention is not limited to this, and may be an equilateral triangular shape or another rectangular shape. The support plate 12b is fixed to the tubular member 12a by a known fastening method such as welding or screwing.

  In the present embodiment, the impeller unit 13 includes a first impeller unit 13a and a second impeller unit 13b. As is clear from FIG. 2, the pair of first impeller units 13a and second impeller units 13b are arranged facing each other at a predetermined interval so that the tapered portions 13c (described later) do not face each other. As shown in FIG. 2, the first impeller unit 13a is housed in the crushing chamber 11b and is rotatably fixed to the rotating shaft 15.

  On the other hand, the second impeller unit 13b is also housed in the pulverizing chamber 11b with a predetermined gap from the first impeller unit 13a. That is, as is apparent from FIG. 2, the second impeller unit 13b faces the first impeller unit 13a in the crushing chamber 11b. In the present embodiment, the first impeller unit 13a and the second impeller unit 13b rotate via the rotary shaft 15, whereby the raw material P flowing into the pulverizing chamber 11b is pulverized.

  Next, the structure of the impeller unit 13 of the present embodiment will be described in detail with reference to FIG. Hereinafter, the first impeller unit 13b will be described first. The first impeller unit 13 a of the present embodiment includes a main body board 131 and a blade 133. The main body board 131 has a shaft hole 131a into which the rotating shaft 15 described later is inserted. The shaft hole 131a is formed with a key groove, which suppresses the main body board 131 from idling when the rotating shaft 15 rotates. The main body board 131 is formed of a metal, and has a plurality of concave portions 131b that open outward in the radial direction at the periphery thereof. As shown in FIG. 3, the concave portion 131b is a tapered concave portion in which the distance gradually decreases as the distance from the center of the main body board 131 increases in the radial direction. Further, the tapered concave portion of the present embodiment has a uniform shape in the thickness direction (Z direction), but may have a bottom at an upper portion or a lower portion in the Z direction, for example. Note that various metals can be applied as examples of the metal constituting the main body board 131. For example, in this embodiment, a steel material such as carbon steel is used.

  The blade 133 is made of a sintered body of an inorganic compound different from a metal, and is at least partially disposed in each of the recesses 131 b of the main body 131. In the present embodiment, since the plurality of recesses 131b are provided in the main body 131, the first impeller unit 13a includes a plurality of blades 133. The blade 133 of this embodiment has a configuration in which the width of the blade 133 in the circumferential direction gradually decreases as the distance from the center of the main body board 131 in the radial direction increases. Therefore, when such a blade 133 is arranged in the tapered recess 131b of the main body 131, the movement of the blade 133 in the recess 131b in the radial direction is suppressed. Various ceramics can be used as the sintered body of the inorganic compound constituting the blade 133, but it is preferable to include, for example, alumina ceramics to which zirconia is added.

  Thus, the plurality of blades 133 are fitted in the recesses 131 of the main body 131, respectively. Each of the plurality of blades 133 has a shape extending radially (radially) from the main body 131. In other words, the plurality of blades 133 are arranged along the circumferential direction of the axis RA of the rotating shaft 15. Preferably, the thickness (dimension in the Z direction) of each blade 133 is substantially equal to the thickness (dimension in the Z direction) of the blade 134 of the second impeller unit 13b described later.

  In addition, each blade 133 has a first inclined surface 133a (a notch). In FIG. 2, the first inclined surface 133a is inclined with respect to the axis RA so as to be further away from the axis RA toward the upper side in the Z direction. In other words, the first inclined surface 133a as a notch is provided at the end of the blade 133 on the side that goes away in the radial direction, and is parallel to the rotation axis (axis RA) of the main body board 131 as it goes away in the radial direction. The thickness in various directions gradually decreases. The first inclined surface 133a faces the above-described first inner surface 111a of the first casing 111 with a predetermined gap. At the time of the pulverization process to be described later, the raw material P or the pulverized material Q passes through the gap between the first inclined surface 133a and the first inner surface 111a and moves to the discharge port 11c above in the Z direction. Go.

  Next, the structure of the second impeller unit 13b will be described. The second impeller unit 13b includes a main body 132 and a blade 134. Since the main body 132 and the blade 134 are structurally the same as the main body 131 and the blade 133 described above, descriptions other than the features described below are appropriately omitted. The main body 132 is disposed at a position overlapping the main body 131 when viewed from above in the Z direction. Further, in FIG. 2, the second inclined surface 134a of the blade 134 is inclined with respect to the axis RA so as to be further away from the axis RA toward the lower side in the Z direction. At the time of the pulverization process to be described later, the raw material P or the pulverized material Q moves to the discharge port 11c above in the Z direction through the gap between the second inclined surface 134a and the second inner surface 112a. Go. In the present embodiment, the size of the gap between the second inclined surface 134a and the second inner surface 112a and the size of the gap between the first inclined surface 133a and the first inner surface 111a are substantially the same. Preferably, they are equal.

  Next, the connection relationship between the main body and the blade in the impeller unit 13 of the present embodiment will be described with reference to FIG. FIG. 4B is a diagram showing a cross section taken along line AA in FIG. 4A. FIG. 4C is a diagram showing a BB cross section in FIG. 4B. In addition, since the second impeller unit 13b is the same as the first impeller unit 13a in the connection relationship, the first impeller unit 13a will be described below as an example. As shown in the figure, in the tapered concave portion 131b of the main body 131, the blade 133 is radially opposed to the side surface of the blade 133 located in the concave 131b (in a direction away from the axis RA of the main body 131). The adjustment member 135 which presses along is arrange | positioned. In the present embodiment, the distance D between the corners of the recess 131b adjacent to each other in the circumferential direction of the main body board 131 is set to 10 to 50 mm, more preferably 15 to 25 mm.

  The adjusting member 135 is formed of, for example, metal, and is disposed on the opposing wall surface 131 c in the concave portion 131 b of the main body board 131. As the adjusting member 135, various mechanisms and members can be applied as long as the adjusting member 135 can be displaced in the radial direction. In the present embodiment, a screw is used as an example. At the time of actual assembling, first, the blade 133 is arranged in the concave portion 131b, and the blade 133 is pressed radially outward (outward with respect to the center of the main body board 131) by the adjusting member 135. Is fitted. After that, by rotating the main body board 131 with the rotating shaft 15 described later, the blade 133 is more firmly fitted in the recess 131b by centrifugal force.

  The number of the adjusting members 135 in the facing wall surface 131c can be appropriately set, and one or more adjusting members 135 may be arranged. In the present embodiment, two adjusting members 135 are arranged in the recess 131b in a direction parallel to the rotation axis (the axis RA) of the main body board 131. Further, in addition to or in place of this, a plurality of adjusting members 135 may be arranged in the radial direction of main body board 131.

  As shown in FIGS. 4 and 5, in the blade 133 of the present embodiment, the end surface 133 a (the surface facing the adjustment member 135) of the blade 133 facing the concave portion 131 b extends in a direction away from the radial direction. A hole 133b having a predetermined depth is provided toward the hole 133b. Thus, the weight of each blade 133 can be reduced, and the load on the motor 16 described below can be reduced to reduce the size.

  The hole 133b of the present embodiment is provided on the side where the notch (first inclined surface 133a) is provided with respect to the center of the blade 133 in the direction parallel to the rotation axis of the main body board 131 (Z direction which is the thickness direction). Is desirably provided eccentrically on the opposite side. At the time of powder processing to be described later, the main body board 131 to which the blade 133 is connected rotates at a high speed. Therefore, if there is an uneven load on the blade 133, a phenomenon that the blade 133 warps in the Z direction during the rotation may occur. On the other hand, in the present embodiment, since the hole 133b is provided on the side opposite to the side where the notch (the first inclined surface 133a) is provided, it is possible to suppress the warpage of the blade 133 during the high-speed rotation described above. It is possible.

  It is preferable that the volume of the hole 133b is substantially the same as the volume of the notch (the first inclined surface 133a). Here, the volume of the notch (the first inclined surface 133a) is substantially equal to the volume of the main body 131 without the notch (the first inclined surface 133a). It is a numerical value obtained by subtracting the volume of the main body 131 on which the surface 133a) is formed.

  Returning to FIG. 2, the description of the details of the crusher 10 will be continued. The connecting portion 14 is a member having a function of connecting the first impeller unit 13a and the second impeller unit 13b. Specifically, the connecting portion 14 fastens the first impeller unit 13a and the second impeller unit 13b with a known fastening material such as a screw. As a result, the first impeller unit 13a and the second impeller unit 13b are integrated via the connecting portion 14.

  The rotating shaft 15 as a driving device is a mechanism for transmitting a force generated by rotation of the motor 16 to the first impeller unit 13a and the second impeller unit 13b. In the present embodiment, the rotating shaft 15 performs a rotating motion about the axis RA. As is clear from FIG. 2, the above-described charging port 11 a is arranged on the side (radial direction of the axis RA) with respect to the rotating shaft 15.

  Such a rotating shaft 15 is formed of, for example, metal or the like, and includes a shaft main body 15a and a fitting portion 15b. The shaft main body 15a is a solid columnar member extending along a direction parallel to the axis RA. The shaft main body 15a is rotatably fixed to the above-described support mechanism 12 via a known bearing member such as a bearing 15c. The shaft main body 15a is inserted through the through-hole in the cylindrical member 12a and the through-hole in the first impeller unit 13a.

<Pulverization process>
Next, an example of a crushing operation of the crushing apparatus 100 will be described with reference to FIGS. 1 and 2. The following crushing operation is performed under the control of a control device (not shown) mounted on the crushing device 100 (such as a personal computer). First, the raw material P is supplied from the feeder 20 to the pulverizing chamber 11b of the pulverizer 10 through the charging device 11a. On the other hand, when the raw material P is supplied to the crushing chamber 11b, the motor 16 is driven, whereby the rotating shaft 15 is driven to rotate. When the rotating shaft 15 rotates, the impeller units 13 (the first impeller unit 13a and the second impeller unit 13b) fixed to the rotating shaft 15 rotate.

  Subsequently, when the impeller unit 13 rotates, an airflow is generated in the crushing chamber 11b with the rotation. In addition, as an example, the rotation speed of the impeller unit 13 is 2000 to 10000 rpm. In the present embodiment, the rotation speed of the impeller unit 13 is 4000 rpm. When the rotation of the impeller unit 13 is started, the suction device 30 is subsequently operated. At this time, the conditions of the suction force (suction pressure, suction flow rate, etc.) of the suction device 30 are set in consideration of the type of the raw material P, the target particle size of the crushed material Q, and the like.

  The raw material P supplied to the pulverizing chamber 11b is pulverized by so-called airflow pulverization. Specifically, the raw material P supplied to the crushing chamber 11b passes between the first impeller unit 13a and the second impeller unit 13b. At this time, at least a part of the supplied raw material P circulates around the first impeller unit 13a on the airflow generated by the rotation of the blade 133. On the other hand, another part of the supplied raw material P is pulled by the blade 134 of the second impeller unit 13b and circulates around the second impeller unit 13b.

  Thus, in the pulverizing chamber 11b, the raw materials P first collide with each other and are pulverized by the circulating airflow generated by the first impeller unit 13a and the circulating airflow generated by the second impeller unit 13b. In the course of the collision between the powders, a part also collides with the blade and is pulverized. Subsequently, the particles of the raw material P, which have been pulverized, are more frequently collided with each other by airflow pulverization, and are further pulverized. Then, some of the particles of the raw material P (in this case, the crushed material Q) riding on the circulating airflow are sucked by the suction force of the suction device 30 and discharged from the discharge port 11c. The crushed material Q discharged from the discharge port 11c is thereafter recovered by the recovery device 40.

  In the first embodiment described above, the blades 133 are arranged in the plurality of tapered recesses 131b formed around the main body board 131, and the blades 133 are fitted in the recesses 131b in the circumferential direction. Are combined. Thereby, it is possible to perform the minimum necessary maintenance according to the state of each blade, and it is also possible to provide the main body with blades 133 having different functions or performances depending on the type of powder. Become.

[Second embodiment]
Next, a crusher 200 according to a second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the main body and the blade are fixed by fitting the blade in the concave portion of the main body, but in the present embodiment, the main body and the blade are connected and fixed via the fastening material. Mainly features. Therefore, differences from the first embodiment will be mainly described below, and elements having the same configurations or functions as those of the first embodiment will be denoted by the same reference numerals and description thereof will be omitted as appropriate.

  That is, as shown in FIG. 6, a screw hole 230a corresponding to the blade 233 is formed on the side surface in the circumferential direction of the main body 230 constituting the impeller unit 23 of the present embodiment. A screw 230b is screwed into the screw hole 230a so that at least a part thereof protrudes from the side surface of the main body 230. The amount of protrusion of the screw 230 b from the side surface of the main body 230 is designed according to the mass of the blade 233 and the rotation speed of the main body 230.

  On the other hand, a screw hole 233b corresponding to the screw 230b is formed on a bottom surface 233a of the blade 233 facing the side surface of the main body 230. When assembling the impeller unit 23, first, the screw 230b is screwed into the screw hole 230a of the main body 230, and then the screw hole 233b of the blade 233 is screwed into the screw 230b protruding from the side surface of the main body 230.

  Thereby, the blade 233 can be firmly fixed to the main body 230, and the same operation and effect as in the first embodiment can be obtained. Further, in this embodiment, since the blade 233 is screwed into the main body 230, the blade 233 can be easily attached to and detached from the main body 230 during maintenance, for example, as compared with the first embodiment.

  Each embodiment described above can be variously modified without departing from the spirit of the present invention. For example, in each of the above embodiments, an example in which two impeller units are arranged in the crushing chamber 11b has been described. However, the present invention is not limited to this, and one or three or more impeller units may be arranged in the crushing chamber 11b. Good. Furthermore, the impeller unit or the crushing device having a structure other than the illustrated one may be configured by appropriately combining the elements of the embodiments and the modified examples described above with combinations other than those described above.

  INDUSTRIAL APPLICABILITY The present invention is suitable for realizing an impeller unit whose function can be easily changed in accordance with a material to be processed while realizing high crushing efficiency and simple maintenance, and a crushing apparatus provided with the impeller unit.

P Raw material Q Crushed material 100, 200 Crusher 10 Crusher 11 Casing 11a Input port 11b Crush chamber 11c Discharge port 12 Support mechanism 13, 23 Impeller unit 14 Connecting portion 15 Rotary shaft 16 Motor 20 Feeder 30 Suction device 40 Recovery device

Claims (6)

A main body plate formed of metal and having a plurality of concave portions formed on the periphery thereof, the concave portions being opened radially outward,
A plurality of blades made of a sintered body of an inorganic compound different from the metal, at least a part of which is arranged in each of the recesses,
The recess is a tapered recess in which the interval gradually narrows as the distance from the center of the main body board in the radial direction increases,
By width in the circumferential direction of the blade becomes gradually narrower as the distance in a radial direction from the center of the body panel, Ri Na is moved in the radial direction suppressed in the tapered recess,
Impeller unit on the end face facing the recess, characterized that you have holes of a predetermined depth is provided toward a direction away in the radial direction of the blade.   2. The impeller unit according to claim 1, wherein an adjusting member that presses the blade along the radial direction is disposed in the tapered concave portion so as to face a side surface of the blade located in the concave portion. 3.   The impeller unit according to claim 2, wherein a plurality of the adjustment members are arranged in the recess in a direction parallel to a rotation axis of the main body board.   The impeller unit according to any one of claims 1 to 3, wherein the metal includes carbon steel, and the sintered body of the inorganic compound includes alumina ceramics to which zirconia is added. At the end of the blade on the side away from the radial direction, a notch portion is provided in which the thickness in the direction parallel to the rotation axis of the main body board gradually decreases as the blade goes away from the radial direction, the hole portion is provided. 2. The impeller unit according to claim 1 , wherein the impeller unit is provided eccentrically with respect to a center of the blade in a direction parallel to the rotation axis and on a side opposite to a side where the notch is provided. A crusher comprising: the impeller unit according to any one of claims 1 to 5 ; a casing accommodating the impeller unit; and a driving device for rotating the impeller unit accommodated in the casing. apparatus.