JP2005288272A - Centrifugal crusher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal crusher capable of classifying a particulate group from a narrow range of particle size to a wide range of particle size compared to the conventional crusher and responding to the diversification of product size compared to the conventional one in a centrifugal crusher having crushing particle size regulation function and classification function. <P>SOLUTION: This centrifugal crusher is provided with a rotor 5 which is installed in a crushing chamber 2 and horizontally rotates for conducting the crushing and the regulation of the particle size by releasing the crushing raw material from a releasing port 5a by centrifugation to collide with a spall deposit layer 3, a lower housing 8 which is connectively installed at the lower part of an upper housing 1 to communicate with the crushing chamber 2 and fed with the group of the crushed particles obtained at the crushing chamber 2, an air-blowing means 12 for classification which is installed so that it is positioned at the lower housing 8 and imparts the centrifugal power to the group of the crushed particles from the crushing chamber 2 by horizontal rotation and a plurality of discharge ports 9, 10 for discharging each of the group of the crushed particles having a range of the different particle size to the outside of the crusher. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a centrifugal crusher having a crushing and sizing function of a crushing raw material and a classification function of the crushing particle group.

  Centrifugal crushers (impact crushers) are used to crush crushing raw materials such as rocks and ores mainly for sand production. Centrifugal crushers are roughly divided into an anvil method and a dead stock method depending on the crushing raw material crushing format. The anvil type is mainly used for the purpose of reducing the size of the raw material. On the other hand, the dead stock type is mainly used for sizing (cutting) a raw material that has already been crushed to a desired size into a round shape like a natural stone. This dead stock type centrifugal crusher is formed from crushed pieces deposited in a crushing chamber by discharging crushing raw material charged into a rotor rotating at high speed to the outside of the rotor from the discharge port on the outer periphery of the rotor by centrifugal force. The crushed piece deposit layer (dead stock) is collided to be crushed, and the particle size is adjusted by rolling or sliding on the inclined surface of the crushed piece deposit layer.

  Conventionally, as a dead stock type centrifugal crusher, the crushing and sizing function of the raw material and the fine particle group (fine powder) are sucked and removed from the crusher outside the crushing particle group obtained in the crushing chamber. One having a classification function has been proposed (Japanese Patent Laid-Open No. 2000-189822). According to this conventional centrifugal crusher, when the amount of fine particles contained in the crushed particle group obtained in the crushing chamber exceeds the JIS standard upper limit of crushed sand, for example, the fine particle group is removed from the obtained crushed particle group. It is not necessary to provide a dedicated classification device such as an air separator. FIG. 9 is a sectional view showing a configuration of a conventional centrifugal crusher.

  As shown in FIG. 9, a crushing chamber 51 is formed in the upper part of the housing 50, and a rotor 60 is disposed at the center of the crushing chamber 51 so as to be able to rotate at high speed in the horizontal direction. A discharge port 61 is formed on the peripheral surface of the rotor 60. In addition, a dead bed (crushed piece deposition layer: dead stock) 52 formed by depositing crushed raw materials is provided at the peripheral portion of the crushing chamber 51 as a collision portion of the crushed raw materials. A downward suction hood 70, a suction pipe 71 that generates negative pressure in the suction hood 70, and a downward suction hood 70 are provided below the rotor 60 and in the lower portion of the housing 50. An annular air blowing pipe 80 for injecting the air supplied through the air feeding pipe 82 upward from the plurality of air blowing ports 81 toward the suction hood 70 is provided.

  And the crushing raw material supplied from the upper center in the rotor 60 is discharged | emitted from the discharge port 61 with the centrifugal force of the rotor 60 rotating at high speed, collides with the dead bed 52, and is crushed. The crushed particle group obtained in the crushing chamber 51 is introduced into the lower part in the housing 50 from the gap space between the rotor 60 and the dead bed 52. Of the crushed particle group introduced into the lower part of the housing 50, the fine particle group is gathered together by the downward suction hood 70 by the air jetted upward from the air blowing pipe 80, and passes through the suction pipe 71 and is outside the crusher. It is sent to the processing facility. On the other hand, the crushed particle group having the product size after being classified as the fine particle group is discharged from the discharge port 54 at the lower end of the housing 50.

However, in the conventional centrifugal crusher described above, the air flow is sucked upward by the downward suction hood 70 provided in the lower part of the housing 50 and the air flow is jetted upward by the air blowing pipe 80. Therefore, the swirling flow of the airflow flowing downward from the gap space generated by the rotating rotor 60 and the upward airflow generated by the suction hood 70 and the air blowing pipe 80 are generated, so that the airflow in the lower part in the housing 50 is generated. Disturbed, not smooth and complicated. For this reason, the particle size range of the fine particle group obtained by classification is narrow and fixed, the fine particle group cannot be classified from a narrow particle size range to a wide particle size range, and it is not possible to cope with diversification of product sizes. there were.
JP 2000-189822 A (page 2-3, FIG. 1) JP-A-57-7264 (page 1-2, FIG. 1 and FIG. 2)

  Therefore, the problem of the present invention is that when a fine particle group is classified from a crushed particle group obtained in a crushing chamber in a centrifugal crusher having a crushing and sizing function and a classification function of the crushed particle group, compared to the conventional case. Accordingly, an object of the present invention is to provide a centrifugal crusher that can classify a group of fine particles over a narrow particle size range to a wide particle size range and can cope with diversification of product sizes as compared with the conventional one.

  In order to solve the above problems, the present invention takes the following technical means.

  According to the first aspect of the present invention, an upper housing, a crushing chamber formed in the upper housing, and a crushing material provided in the crushing chamber, which is supplied from above, are discharged from the discharge port on the outer periphery of the rotor by centrifugal force. A horizontally rotating rotor for crushing and sizing by colliding with a collision portion provided around the rotor, and communicating with the crushing chamber and continuously provided at a lower portion of the upper housing, and obtained in the crushing chamber. A lower housing in which the crushed particles are introduced from a gap space between the rotor and the impingement part, and the crushed particles are horizontally positioned and centrifuged into the crushed particles from the crushing chamber. A classifying air supplying means for applying force, and a plurality of discharge ports provided in the lower housing and for discharging crushed particle groups having different particle diameter ranges to the outside of the crusher, respectively. It is a heart crusher.

  According to a second aspect of the present invention, in the centrifugal crusher according to the first aspect, the plurality of discharge ports provided in the lower housing include a fine particle discharge port for discharging the fine particle group, and a crushed particle group having a product size. It is a product outlet for discharging water.

  According to a third aspect of the present invention, in the centrifugal crusher according to the first or second aspect, the classification blowing means is a centrifugal blower.

  According to a fourth aspect of the present invention, in the centrifugal crusher according to the first or second aspect, the classifying blower is an axial blower.

  According to a fifth aspect of the present invention, in the centrifugal crusher according to the third or fourth aspect, drive sources for the rotor and the classifying blower are configured in common.

  According to a sixth aspect of the present invention, in the centrifugal crusher according to the first or second aspect, the classification blower is directly or indirectly attached to the lower surface of the rotor bottom plate of the rotor and rotates horizontally with the rotor. It is the air blowing blade for classification.

  The centrifugal crusher according to the present invention is provided so as to be located in the lower housing into which the crushed particle group obtained in the crushing chamber is introduced, and horizontally rotates to apply centrifugal force to the crushed particle group from the crushing chamber. Classification air blowing means is provided. Therefore, the swirling flow by the rotor and the swirling flow by the classifying air blowing means merge, and a smooth swirling flow that travels downward in the classification space located upstream of the crushed particle discharge port in the lower housing is generated. It is possible to obtain a flow field in which the swirling wind speed is substantially uniform in the radial direction from the upper part of the classification space to the lower part of the classification space. Thereby, when classifying the pulverized particle group obtained in the crushing chamber into a plurality of particle size groups, for example, a fine particle group and a pulverized particle group of product size, the fine particle group is wider from a narrow particle size range than before. Classification is possible over the particle size range, and it is possible to cope with diversification of product size as compared with the conventional one.

  Further, in the case where the classification blower means is configured by directly or indirectly attaching the classification blower blade to the lower surface of the rotor bottom plate of the rotor, the classification blower means can be realized with a simple configuration at low cost, and crushing Cost reduction of a centrifugal crusher having a sizing function and a classification function can be achieved.

  Embodiments of the present invention will be described below. FIG. 1 is a sectional view showing a configuration of a centrifugal crusher according to a first embodiment of the present invention.

  As shown in FIG. 1, the upper housing 1 which has the crushing chamber 2 inside is provided, and the rotor 5 is arrange | positioned in the center part in the crushing chamber 2 which makes cylindrical space. On the inner periphery of the crushing chamber 2, a crushing piece accumulation layer (dead stock) 3 used for crushing and sizing is formed as a collision part by crushing pieces (crushing particles). The rotor 5 is attached to an upper end portion of a vertical rotation shaft extending in the vertical direction of the rotor rotation drive mechanism portion 6 disposed in the lower housing upper body 8 a of the lower housing 8. It is horizontally rotated by a motor (not shown) incorporated in the motor.

  The rotor 5 as a whole has a hollow cylindrical shape having a plurality of discharge ports 5a on the outer peripheral surface. The rotor 5 has a disc shape and has a through hole at the center thereof. The rotor bottom plate 5b is fixed to the upper end of the vertical rotation shaft fitted in the through hole, and the upper surface of the rotor bottom plate 5b. A distribution plate 5d provided at the center and a through-hole in which a feed pipe 4 to which a raw material is supplied is arranged at the center and in parallel with this is provided above the rotor bottom plate 5b. Provided between the rotor top plate 5c, the rotor bottom plate 5b, and the rotor top plate 5c arranged along the outer periphery of the rotor bottom plate 5b with a space for forming the discharge port 5a (not shown) It comprises a plurality of dead stock forming walls and a plurality of projection chips (not shown) attached to these dead stock forming walls. In some cases, a striker is attached in the vicinity of the projection tip.

  The lower housing 8 has a cylindrical lower housing upper body 8a and a lower housing lower body 8b having an inverted frustoconical cylindrical shape connected to the lower side thereof. The lower housing upper body 8 a is connected to the lower side of the upper housing 1 in a state where it communicates with the crushing chamber 2 through the annular gap space 7. A product discharge port 9 is provided at the lower end of the lower housing lower body 8b. In addition, a particulate discharge port 10 that is opened over the entire circumference is provided on the upstream side of the product discharge port 9 in the lower housing lower body 8b. In the lower housing 8, a classification space 11 is formed that is located upstream of the discharge ports 9 and 10.

  In the lower housing lower body 8a, a horizontally rotating multi-blade fan (sirocco fan) 12, which is one of centrifugal fans, is disposed below the rotor rotation drive mechanism 6. Reference numeral 13 denotes a blower rotational drive mechanism for rotationally driving the multiblade blower 12. In the present embodiment, the rotor 5 and the multiblade fan 12 are driven in the same rotational direction at different rotational speeds depending on gears or the like, using the same single motor as a drive source. In this case, power consumption can be reduced as compared with the case where the drive sources are individually provided. The multiblade blower 12 includes an impeller formed by arranging a plurality of blades (blades) 12a having a rectangular shape that is short in the radial direction and long in the axial direction at equal intervals in the circumferential direction. The multiblade blower 12 is provided so as to be positioned in the lower housing 8 and constitutes a classifying blower that rotates horizontally and applies centrifugal force to the crushed particles from the crushing chamber 2.

  In the centrifugal crusher configured as described above, the crushing raw material charged into the rotor 5 rotated at high speed from the feed pipe 4 is discharged to the outside of the rotor from the discharge port 5a on the outer periphery of the rotor by centrifugal force, and the crushing pieces By colliding with the deposited layer 3 and rolling and sliding on the inclined surface of the fragmented piece deposited layer 3, crushing and sizing are performed. And the crushing particle group obtained in this crushing chamber 2 is accompanied by the air current in which the horizontal swirling component by horizontal rotation of the rotor 5 is dominant, and an annular shape between the rotor 5 and the peripheral part of the crushing piece accumulation layer 3 is obtained. It passes through the gap space 7 and falls while turning, and is introduced into the classification space 11 in the lower housing 8.

  In the classification space 11 in the lower housing 8, the multi-blade fan 12 rotates, so that the swirl flow by the rotor 5 and the swirl flow by the multi-blade fan 12 merge to progress smoothly downward into the classification space 11. A simple swirling flow can be obtained. Further, since the swirling wind speed is increased in the classification space 11 as compared with the case of the rotor 5 alone, it is possible to obtain a flow field in which the swirling wind speed is almost uniform in the radial direction from the upper classification space to the lower classification space. Thereby, the crushing particle group introduced from the crushing chamber 2 into the classification space 11 in the lower housing 8 has a flight trajectory (falling stroke) downward according to the particle size, so that the particle group and the product The particles are classified into the size crushed particles, the particles are discharged from the particle discharge port 10, and the product size crushed particles are discharged from the product discharge port 9. In addition, the fine particle group can be classified from a narrow particle size range to a wide particle size range as compared with the conventional case, and the product size can be diversified as compared with the conventional case.

  Here, this embodiment will be further described. The crushed particle group obtained in the crushing chamber 2 passes through the annular gap space 7 with the horizontal fall speed component due to the horizontal rotation of the rotor 5 and the vertical fall velocity component due to gravity, and is introduced into the classification space 11. At this time, for example, in the case of the rotor 5 having a diameter of 1 m rotating at a rotation speed of about 1000 rpm, the rotor peripheral speed is about 50 m / s, and the air flow rate in the annular gap space 7 is 10 to 30 m / s.

  The stroke of each particle to be classified while swirling in the classification space 11 affects the number of rotations of the rotor 5 and the multiblade fan 12, the geometric shape of the classification space 11, and the particle size distribution of the crushed particles. It is thought that it is done. Here, FIG. 7 shows the stopping distance of the spherical particles in the horizontal direction at each initial velocity when the same initial velocity as the wind velocity is given to the spherical particles in the flow field (horizontal direction) assuming no gravity. It is the graph which calculated | required and showed by calculation. According to FIG. 7, for spherical particles having a particle diameter of 0.1 mm, for example, the stopping distance when the initial velocity is 5 m / s is about 0.35 m, and the stopping distance when the initial velocity is 10 m / s is about 0. 5 m. Conversely, when the particle size (diameter) of the fine particles to be classified from the fine particle discharge port 10 is 0.1 mm, the initial velocity is 1 m when the distance of the fine particles from the annular gap space 7 to the fine particle discharge port 10 is 1 m. Needs to be about 50 m / s or be accelerated during the stroke.

  In the centrifugal crusher according to the present embodiment, the multi-blade fan 12 that applies centrifugal force to the crushing particle group from the crushing chamber 2 is provided in the lower housing 8, so that the classification space 11 extends from the upper part of the classification space to the lower part of the classification space. Since the swirling wind speed can achieve a substantially uniform flow field in the radial direction and the circumferential velocity component is proportional to the radial distance from the lower housing 8 axis (crusher axis), The drag force received is proportional to the square of the distance. Accordingly, since the drag from the airflow received by each crushed particle varies depending on the particle size, and the flight trajectory (stroke) of the crushed particle having a different particle size differs accordingly, the crushed particle group from the crushing chamber 2 is divided into the fine particle group. And pulverized particles of product size, and the particles can be discharged from the particle discharge port 10.

  FIG. 2 is a sectional view showing a configuration of a centrifugal crusher according to a second embodiment of the present invention. Here, since the radial dimension of the impeller (impeller) of the multiblade fan 12 ′ is different from that of the first embodiment, the same components as those of the first embodiment are denoted by the same reference numerals. Thus, the description will be omitted, and different points will be described.

  In the centrifugal crusher according to the present invention, the crushed particles that have passed through the annular gap space 7 immediately enter the classification space 11 in the lower housing 8 according to the air flow distribution in the classification space 11, each particle size, and the inflow velocity. In addition to receiving drag from the air current, it spreads and falls to have a non-uniform particle number density distribution in the radial direction of the classification space while receiving gravity. For this reason, the crushed particles having a relatively large particle size are dominantly accelerated by gravity rather than the horizontal swirl component, and fall almost vertically without drawing a parabola in a vertical sectional view.

  Therefore, the centrifugal crusher according to the second embodiment includes a multiblade blower 12 ′ in which the radial dimension of the impeller (impeller) is less than or equal to the inner diameter dimension of the annular gap space 7, as shown in FIG. 2. ing. Accordingly, the crushed particles having a relatively large particle size can be prevented from colliding with the impeller having the blade (blade) 12a ', and erosion (wear, damage) of the impeller can be prevented.

  FIG. 3 is a sectional view showing the configuration of a centrifugal crusher according to a third embodiment of the present invention. Here, since it is the same as that of the said 1st Embodiment except having replaced with the multiblade fan as a classification | category ventilation means and having the axial flow fan 14, it is the same code | symbol to the same component as 1st Embodiment. The description is omitted.

  As shown in FIG. 3, the axial blower 14 includes a plurality of blades (blades) 14 a having a shape that is long in the radial direction and short in the axial direction, and the axial blower 14 may be used instead of the multiblade blower. Is possible. A multi-blade fan is preferable to the axial fan 14.

  In the first to third embodiments, one blower is provided. However, the present invention is not limited to this, and in the centrifugal crusher according to the present invention, the shape and size of the crusher, the raw material processing amount, and Depending on operating conditions (rotor speed, etc.), a plurality of fans arranged in the vertical direction may be provided.

  FIG. 4 is a cross-sectional view showing the configuration of a centrifugal crusher according to a fourth embodiment of the present invention, FIG. 5 is a cross-sectional view for explaining the classification blade in FIG. 4, and FIG. 6 is attached to the rotor bottom plate in FIG. It is a top view which shows the obtained ventilation blade for classification. Here, since the classification blowing fan 21 is provided in place of the multiblade fan 12 and the structure of the lower housing 22 is different, the first embodiment is the same as the first embodiment. The same components as those in the embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 4, the rotor 5 is attached to the upper end portion of the vertical rotation shaft extending in the vertical direction of the rotor rotation drive mechanism portion 6 ′ disposed in the lower housing body 22 a of the lower housing 22. It is rotated horizontally by a motor (not shown) incorporated in the rotary drive mechanism section 6 ′.

  The lower housing 22 includes a cylindrical lower housing main body 22a, and a cylindrical lower housing lower body 22b provided with the lower housing main body 22a surrounded by an upper portion thereof with a gap distance D2. And have. The lower housing 22 is connected to the crushing chamber 2 by an annular gap space 7 between the rotor 5 and the crushing piece accumulation layer 3, and the lower housing main body 22 a is connected to the lower side of the upper housing 1. . A product discharge port 23 is provided at the lower end of the lower housing lower body 22b. In addition, a particulate discharge port 24 that is opened over the entire circumference is provided between the lower housing main body 22a and the lower housing lower body 22b. In the lower housing main body 22a, a classification space 25 is formed that is located upstream of the discharge ports 23 and 24.

  On the lower surface of the rotor bottom plate 5 b of the rotor 5, a plurality of steel classifying blades 21 that are horizontally rotated integrally with the rotor 5 are attached. As shown in FIGS. 4 to 6, each classification blower blade 21 has a rectangular plate shape, a blade width W, a blade height H, and a thickness T, on the lower surface of the rotor bottom plate 5 b. The blade center lines, which are equidistant from each other and parallel to the blade surface, are fixed to the outer peripheral portion of the rotor so as to go to the center point of the rotor bottom plate 5b.

  In the centrifugal crusher configured as described above, the air flow in which the horizontal swirl component due to the horizontal rotation of the rotor 5 is dominant, and the horizontal swirl component by the classification blower blade 21 that rotates horizontally integrally with the rotor 5 is dominant. A smooth swirling flow without any turbulence that travels downward into the classification space 25 can be obtained. Further, since the swirling wind speed is increased in the classification space 25 as compared with the case of the rotor 5 alone, a flow field in which the swirling wind speed is almost uniform in the radial direction from the upper classification space to the lower classification space can be obtained. Thereby, the crushed particle group introduced from the crushing chamber 2 into the classification space 25 in the lower housing 22 has a flight trajectory (falling process) downward according to the particle size, whereby the fine particle group and the product. The particles are classified into the size pulverized particle group, the particle group is discharged from the particle discharge port 24, and the product size crushed particle group is discharged from the product discharge port 23. Since the fine particle group can be classified from a narrow particle size range to a wide particle size range as compared with the conventional case, it is possible to cope with diversification of the product size as compared with the conventional case.

  Further, the centrifugal crusher according to the fourth embodiment is provided so as to be located in the lower housing 22, and has a classifying blower that rotates horizontally and applies centrifugal force to the crushed particles from the crushing chamber 2. A classification blower blade 21 is attached to the lower surface of the rotor bottom plate 5 b of the rotor 4. Therefore, the classifying air blowing means can be realized at a low cost with a simple configuration, and the cost of the centrifugal crusher having the crushing and sizing function and the classification function can be reduced.

  Here, the size of the classification blower blade 21 will be described. In the case where the crushed raw material input amount per unit time is operated in a constantly large state, the amount of the crushed particle group passing through the annular gap space 7 is small. There is a concern that the air velocity caused by the horizontal rotation of the rotor 5 is reduced due to the increase. Therefore, in order to realize a flow field having a horizontal component for realizing the desired classification performance in the classification space 25, in order to realize the static pressure increase obtained by the classification fan 21, the classification fan 21 having a larger blade width W is desirable. For example, when the classification space 25 has a large radial dimension, or the opening dimension D2 of the particulate discharge port 24 (see FIG. 4) is smaller than the opening dimension D1 of the product discharge port 23 (see FIG. 4), the classification is performed. Since it is necessary to enhance the swirl component of the speed given to the fine particle group of the crushed particle group introduced into the space 25, in order to increase the air volume in the radial direction by the classification blade 21, the classification blade 21 is provided. It is desirable to increase the blade height H.

  FIG. 7 is a plan view showing another air blowing blade for classification according to the centrifugal crusher of the present invention, which is attached to the rotor bottom plate.

  As shown in FIG. 7, the classifying blower blade 21 'has a streamlined shape with a curved blade surface, and is a so-called forward blade (forward blade). According to such a classification blower blade 21 ′, it is possible to increase the blowing capacity (air volume, pressure) as compared with the classification blower blade 21 shown in FIG. 4 (FIG. 6). Even in the case of the classification blade 21 ′, the setting of the blade size is basically the same as that of the classification blade 21 described above.

  In the embodiment, the classification blower blades 21 and 21 ′ are directly attached to the lower surface of the rotor bottom plate 5 b, but have the same size as the rotor 5 that rotates integrally with the rotor 5. You may make it attach to a member. Further, the number of the classifying blower blades 21, 21 ′ may be determined by the size of the rotor 5, its operating conditions, the flow field realized in the classifying space 25, and the like.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. In the embodiment, the collision portion provided around the rotor is constituted by a fragmented deposit layer. However, the collision portion is not particularly limited to this, and is constituted by a crushing chamber wall surface or a crushing chamber structure. It may be the one.

It is sectional drawing which shows the structure of the centrifugal crusher by 1st Embodiment of this invention. It is sectional drawing which shows the structure of the centrifugal crusher by 2nd Embodiment of this invention. It is sectional drawing which shows the structure of the centrifugal crusher by 3rd Embodiment of this invention. It is sectional drawing which shows the structure of the centrifugal crusher by 4th Embodiment of this invention. It is sectional drawing for demonstrating the ventilation blade for classification in FIG. It is a top view which shows the ventilation blade for a classification | category attached to the rotor bottom plate in FIG. It is another air blower for classification concerning the centrifugal crusher of this invention, Comprising: It is a top view which shows the air blower for classification attached to the rotor bottom plate. Calculated and calculated the stopping distance of the spherical particles in the horizontal direction at each initial velocity when the initial velocity same as the wind velocity is given to the spherical particles in the flow field (horizontal direction) assuming no gravity It is a graph. It is sectional drawing which shows the structure of the conventional centrifugal crusher.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Upper housing 2 ... Crushing chamber 3 ... Fragment deposit layer 4 ... Feed pipe 5 ... Rotor 5a ... Discharge port 5d ... Distribution plate 5b ... Rotor bottom plate 5c ... Rotor top plate 6, 6 '... Rotation drive mechanism part 7 for rotors ... annular clearance space 8 ... lower housing 8a ... lower housing upper body 8b ... lower housing lower body 9 ... product discharge port 10 ... particulate discharge port 11 ... classification space 12, 12 '... multi-blade fan 12a, 12a' ... wing 13 Rotational drive mechanism for blower 14 ... Axial blower 14a ... Blade 21, 21 '... Classification blower 22 ... Lower housing 22a ... Lower housing body 22b ... Lower housing lower body 23 ... Product discharge port 24 ... Fine particle discharge port 25 ... Classification space

Claims (6)

  An upper housing, a crushing chamber formed in the upper housing, and a crushing material supplied from above are discharged from the discharge port on the outer periphery of the rotor by centrifugal force, and are provided around the rotor. A horizontally rotating rotor for colliding with a colliding part to perform crushing and sizing, and a crushing particle group obtained in the crushing chamber are connected to the crushing chamber and connected to the lower part of the upper housing. A lower housing introduced from a gap space between the rotor and the collision portion, and a classification blower that is provided so as to be positioned in the lower housing and horizontally rotates to apply centrifugal force to the crushed particles from the pulverization chamber A centrifugal crusher provided with means and a plurality of discharge ports provided in the lower housing for discharging crushing particle groups having different particle diameter ranges to the outside of the crusher, respectively.   The plurality of discharge ports provided in the lower housing are a particle discharge port for discharging a particle group and a product discharge port for discharging a crushed particle group of a product size. The centrifugal crusher according to 1.   The centrifugal crusher according to claim 1 or 2, wherein the classifying blower is a centrifugal blower.   The centrifugal crusher according to claim 1 or 2, wherein the classification blower is an axial blower.   The centrifugal crusher according to claim 3 or 4, wherein drive sources of the rotor and the classifying blower are configured in common. The centrifugal fan according to claim 1 or 2, wherein the classification air blowing means is a classification air blowing blade that is directly or indirectly attached to a lower surface of a rotor bottom plate of the rotor and rotates horizontally integrally with the rotor. Crushing machine.

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