JP2006095488A - Centrifugal crusher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal crusher having a crushed particle size regulation function and a crushed particle group classification function capable of classifying crushed particles more accurately as compared with a conventional process when a fine particle group of the crushed particle groups obtained in a crushing room is classified. <P>SOLUTION: The centrifugal crusher has an upper housing 1, the crushing room 2 formed in the upper housing 1, a horizontally rotating rotor 5 arranged in the crushing room 2 for discharging a crushing raw material from a discharging opening of a peripheral part of the rotor by centrifugal force to make it collide with a crushed-chip accumulating layer 3 to crush and classify, a lower housing 8 communicating with the crushing room 2 for introducing the crushed particle group obtained in the crushing room 2 from a circular space 7, a gas feeding duct 12 arranged with together a rotary driving mechanical part 6 for the rotor in the lower housing 8 for feeding the gas radially directing to the circular space 7, a product discharging opening 9 arranged in the lower housing 8 for discharging the particles group of product size, and a fine-particle discharging opening 10 for discharging the fine particle group. <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. 6 is a cross-sectional view showing a configuration of a conventional centrifugal crusher.

  As shown in FIG. 6, the crushing chamber 51 is formed in the upper part in the housing 50, and the rotor 60 is arrange | positioned in the center so that high-speed rotation is possible 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 group of crushed particles obtained in the crushing chamber 51 is introduced into the lower part of the housing 50 through the gap 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 air flow downward from the gap generated by the rotating rotor 60 and the upward air flow by the suction hood 70 and the air blowing pipe 80 are generated, and the air flow in the lower part in the housing 50 is disturbed. It is not smooth and complicated. For this reason, there is room for improvement in classifying the fine particle group from the crushed particle group obtained in the crushing chamber 51 with high accuracy.
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, in the centrifugal crusher having a crushing and sizing function and a classification function of the crushing particle group, when classifying the fine particle group from the crushing particle group obtained in the crushing chamber, compared to the conventional case An object of the present invention is to provide a centrifugal crusher capable of classifying with high accuracy.

  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 rotor that is supported by a rotor rotary drive mechanism for horizontally crushing and sizing by colliding with a collision part provided around the rotor, and communicates with the lower part of the upper housing in communication with the crushing chamber. A lower housing into which the crushed particles obtained in the crushing chamber are introduced from an annular gap between the rotor and the collision portion, and the rotary drive mechanism portion for the rotor are provided in parallel in the lower housing, An air flow supply duct for supplying an air flow that radiates to the annular gap and the lower housing are each provided to discharge crushed particle groups having different particle size ranges to the outside of the crusher. It is a centrifugal crusher, characterized in that it comprises a plurality of discharge ports, the for.

  According to the second aspect of the present invention, the upper housing, the crushing chamber formed in the upper housing, and the crushing material provided from above are discharged from the discharge port of the outer peripheral portion of the rotor by centrifugal force. A rotor that is supported by a rotor rotary drive mechanism for horizontally crushing and sizing by colliding with a collision part provided around the rotor, and communicates with the lower part of the upper housing in communication with the crushing chamber. A lower housing in which the crushed particles obtained in the crushing chamber are introduced from an annular gap between the rotor and the collision portion, an inlet opening at the lower end, and arranged in parallel with the rotary drive mechanism portion for the rotor An axial airflow inlet passage that extends in the vertical direction, and an outlet opening that extends radially and communicates with the axial airflow inlet passage and that is located near the annular gap and along the inner circumferential edge of the annular gap. Holding A radial airflow outlet passage, an airflow supply duct provided in the lower housing, and a plurality of exhausts provided in the lower housing for discharging crushed particle groups having different particle size ranges to the outside of the crusher. And a centrifugal crusher characterized by comprising an outlet.

  According to a third 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 a discharge port on the outer periphery of the rotor by centrifugal force. A rotor that is supported by a rotor rotary drive mechanism for horizontally crushing and sizing by colliding with a collision part provided around the rotor, and communicates with the lower part of the upper housing in communication with the crushing chamber. A lower housing in which the crushed particle group obtained in the crushing chamber is introduced from an annular gap between the rotor and the collision portion, and a shaft extending in parallel with the rotary drive mechanism portion for the rotor A directional airflow inlet passage, and a radial airflow outlet passage that extends radially and communicates with the axial airflow inlet passage, and has an outlet opening located near the annular gap and along the inner circumferential edge of the annular gap. An air flow supply duct provided in the lower housing and a blower pipe connected to the lower end portion of the axial airflow inlet passage for supplying air to the airflow supply duct from an air blow source outside the crusher And a plurality of outlets that are provided in the lower housing and discharge the crushed particle groups having different particle diameter ranges to the outside of the crusher, respectively.

  According to a fourth aspect of the present invention, in the centrifugal crusher according to the second or third aspect, the air flow supply duct is further located below the radial air flow outlet passage and radially flows into the lower housing. It has the radial airflow exit channel | path for lower parts which guides.

  The centrifugal crusher according to the invention of claim 1 is configured such that the crushed particles obtained in the crushing chamber are radially formed in the annular gap in the lower housing into which the crushed particles are introduced from the annular gap between the rotor and the collision portion. An airflow supply duct for supplying an airflow going in parallel is provided in parallel with the rotary drive mechanism for the rotor. Therefore, the solid-gas two-phase swirl flow that flows in from the annular gap and the air flow from the air flow supply duct are combined, and the classification in the lower housing is performed as a flow field for air flow classification based on centrifugal force and fluid resistance force. A smooth classification swirling flow that travels downward into the space can be obtained. Therefore, when classifying the crushed particle group obtained in the crushing chamber into a fine particle group and a pulverized particle group having a product size, classification can be performed with higher accuracy than in the past.

  The centrifugal crusher according to the invention of claim 2 is configured such that the crushing particle group obtained in the crushing chamber has a radial shape in the annular gap in the lower housing into which the crushing particle group is introduced from the annular gap between the rotor and the collision portion. An air flow supply duct is provided for supplying an upward air flow. The air flow supply duct has an inlet opening at the lower end, is arranged in parallel with the rotary drive mechanism for the rotor and extends in the up-down direction, communicates with the inlet passage, extends radially, and has an annular gap at the tip. And a radial air flow outlet passage having an outlet opening located adjacent to the inner peripheral edge of the annular gap. As a result, since the solid-gas two-phase swirl flow containing the crushed particles due to the rotation of the rotor flows into the annular gap, the direction of the solid-gas two-phase swirl flow is outward, so the air supply duct A relatively negative pressure is generated in the vicinity of the outlet opening, and in the airflow supply duct, an airflow is generated that flows in from the inlet opening and is drawn out from the outlet opening and traveling radially in the annular gap. Therefore, the solid-gas two-phase swirling flow that flows in from the annular gap and the air flow from the air flow supply duct that accompanies this are combined, and the flow field for performing air flow classification based on centrifugal force and fluid resistance force is A smooth classification swirling flow that travels downward into the classification space in the housing can be obtained. Therefore, when classifying the crushed particle group obtained in the crushing chamber into a fine particle group and a pulverized particle group having a product size, classification can be performed with higher accuracy than in the past.

  The centrifugal crusher according to the invention of claim 3 has an axial airflow inlet passage and a radial airflow outlet passage in a lower housing into which the crushed particles obtained in the crushing chamber are introduced from an annular gap, and is used for a rotor. An air flow supply duct arranged in parallel with the rotation drive mechanism and a lower end portion of the air flow inlet passage in the axial direction of the air flow supply duct, for supplying air to the air flow supply duct from an air blowing source outside the crusher A blower tube is provided. Therefore, the solid-gas two-phase swirl flow that flows in from the annular gap and the airflow from the airflow supply duct supplied from the air blowing source outside the crusher are combined to perform airflow classification based on centrifugal force and fluid resistance force. As a flow field, a smooth swirling flow having a sufficient air volume can be obtained which travels downward into the classification space in the lower housing. Therefore, when classifying the crushed particle group obtained in the crushing chamber into a fine particle group and a product-sized crushed particle group, classification can be performed with higher accuracy than before, and classification can be performed with high processing capacity. Can do.

  The centrifugal crusher according to a fourth aspect of the present invention is the lower radial airflow outlet passage in which the airflow supply duct is further positioned below the radial airflow outlet passage and guides the airflow radially toward the classification space in the lower housing. It is set as the structure which has. Accordingly, it is possible to realize a classifying swirl flow that does not cause a deceleration in which the velocity component in the horizontal direction deteriorates the classification accuracy as it goes to the lower part of the classification space. Therefore, when classifying the crushed particle group obtained in the crushing chamber into a fine particle group and a pulverized particle group of the product size, classification can be performed with higher accuracy than in the past, and classification can be performed with high processing capacity. It can be carried out.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a broken perspective view showing a configuration of a centrifugal crusher according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of the centrifugal crusher shown in FIG. 1, and FIG. 3 illustrates an air flow supply duct in FIG. FIG.

  As shown in FIGS. 1 and 2, an upper housing 1 having a crushing chamber 2 is provided, and a rotor 5 is disposed in the center of the crushing chamber 2 forming a columnar 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 the upper end of a vertical rotation shaft extending in the vertical direction of the rotor rotation drive mechanism 6 disposed in the lower housing main body 8a of the lower housing 8, and is rotated horizontally. The rotor rotation drive mechanism 6 is fixed and attached to the lower housing body 8a via an attachment member. The crushing chamber 2, the rotor 5, the rotor rotation drive mechanism 6, and the lower housing 8 are provided so that their center lines (axial centers) coincide.

  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 includes a cylindrical lower housing body 8a, and a cylindrical lower housing lower body 8b provided with the lower housing body 8a surrounded by an upper portion thereof with a gap distance D2. And have. The lower housing 8 is connected to the crushing chamber 2 through an annular gap 7 between the rotor 5 and the crushing piece accumulation layer 3, and the lower housing body 8 a is connected to the lower side of the upper housing 1. 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 open over the entire circumference is provided between the lower housing body 8a and the lower housing lower body 8b.

An airflow supply duct 12 is disposed in the lower housing 8. The air flow supply duct 12 is provided close to and in parallel with the rotor rotation drive mechanism 6 and extends in the vertical direction so as to be parallel to the drive mechanism 6 and the upper peripheral edge of the cylinder 13. , The inner peripheral surface is fixed to the outer peripheral surface of the rotor rotation drive mechanism unit 6, and the outer peripheral surface is formed of a hollow annular body 14 opened over the entire periphery. The hollow annular body 14 is formed, for example, by sandwiching a spacer plate at a 120 ° pitch between an upper annular plate and a lower annular plate, and fixing the upper and lower annular plates to the spacer plate, respectively. is there. Thereby, as shown in FIGS. 1 and 2, the air flow supply duct 12 has an inlet opening 13a ₁ at the lower end, is arranged in parallel with the rotor rotation drive mechanism unit 6 and is in parallel with the axis. An axial airflow inlet passage 13a extending in the vertical direction, and an outlet opening 14a communicating with the inlet passage 13a and extending radially in the radial direction, close to the annular gap 7 at the tip and positioned along the inner peripheral edge of the gap 7 ₁ has a radial airflow outlet passage 14a. The air flow supply duct 12 is disposed in the lower housing main body 8 a, and a classification space 11 is formed that is located upstream of the particulate discharge port 10. Incidentally, in FIG. 3, L1 indicates a radial direction (horizontal direction) length of the radial airflow outlet passage 14a, H1 denotes a vertical opening length of the outlet opening 14a _1.

  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.

Then, the horizontal swirl component due to the horizontal rotation of the rotor 5 is dominant, and the solid-gas two-phase swirl flow including the crushed particles obtained in the crushing chamber 2 flows into the annular gap 7. Since this solid-gas two-phase swirling flow flows into the annular gap 7, the direction of the solid-gas two-phase swirling flow is outward, so that a relatively negative pressure is generated in the vicinity of the outlet opening 14 a ₁ of the air flow supply duct 12. In the air flow supply duct 12, an air flow is generated that flows in from the inlet opening 13 a _{1 and} is drawn out from the outlet opening 14 a ₁ and radiates toward the annular gap 7.

  Accordingly, the classification space in the lower housing 8 serves as a flow field for classifying the air flow by combining the solid-gas two-phase swirl flow that flows in from the annular gap 7 and the air flow from the air flow supply duct 12 that accompanies this. 11, a smooth swirling flow for classification that travels downward can be obtained. As a result, the crushed particle group introduced into the classification space 11 is accurately divided into a fine particle group and a crushed particle group of a product size because each crushed particle has a downward flight trajectory (falling process) according to the particle size. After the classification, the fine particle group is discharged from the fine particle discharge port 10, and the crushed particle group of the product size is discharged from the product discharge port 9.

  Thus, in the case of a solid-gas two-phase swirl flow alone flowing from the annular gap 7, for example, when the rotor 5 has a diameter of 1 m and rotates at a rotation speed of about 1000 rpm, the rotor peripheral speed is about 50 m / s. Although the air flow velocity in the annular gap 7 is 10 to 30 m / s, the air volume is insufficient to perform airflow classification with high accuracy. On the other hand, by providing the air flow supply duct 12, the solid-gas two-phase swirl flow from the annular gap 7 and the air flow from the air flow supply duct 12 that accompanies it are combined to perform air flow classification. As a place, a smooth swirl flow for classification that progresses downward into the classification space 11 in the lower housing 8 can be obtained, and classification can be performed with high accuracy.

Here, the air flow supply duct 12 may have a configuration in which the outlet opening 14 a ₁ is positioned close to the annular gap 7 and along the inner peripheral edge of the gap 7. Further, the air flow supply duct 12 is preferably configured such that the inlet opening 13 a ₁ is positioned below the classification space 11. Moreover, it is desirable that the inner diameter dimension D3 of the cylindrical body 13 of the airflow supply duct 12 be as large as possible so as not to interfere with the airflow classification in the classification space 11 and to reduce the ventilation resistance as much as possible.

  FIG. 4 is a broken perspective view showing a configuration of a centrifugal crusher according to a second embodiment of the present invention. Here, in this 2nd Embodiment, the same code | symbol as FIG. 1 is attached | subjected to the same component as the centrifugal crusher shown in the said FIG. 1, description is abbreviate | omitted, and a different point is demonstrated.

As shown in FIG. 4, an airflow supply duct 32 is disposed in the lower housing 8. The air flow supply duct 32 is provided adjacent to and in parallel with the rotor rotation drive mechanism unit 6 and extends in the vertical direction in parallel with the drive mechanism unit 6, and the upper end of the cylinder body 33. A hollow annular body 34 is connected to the periphery, the inner peripheral surface is fixed to the outer peripheral surface of the rotor rotation drive mechanism unit 6, and the outer peripheral surface is opened over the entire periphery. Thereby, as shown in FIG. 4, the airflow supply duct 32 is provided in the vicinity of the rotor rotation drive mechanism unit 6 in parallel with the airflow supply duct 32 and is axially parallel to the axial airflow inlet passage 33 a extending in the vertical direction. extending radially in the radial direction communicating with the inlet passage 33a, a radial air flow outlet passage 34a having an outlet opening 34a ₁ located along the inner periphery of the clearance 7 close to the annular gap 7 to the tip Yes.

  Further, air from an air blow source (not shown) outside the crusher (for example, a blower) is supplied to the air flow supply duct 32 at the lower end of the axial air flow inlet passage 33a (cylindrical body 33) of the air flow supply duct 32. A blower pipe 31 extending in the radial direction is connected. Thus, the air flow supply duct 32 and the blower pipe 31 are disposed, and the classification space 11 located upstream of the particulate discharge port 10 is formed in the lower housing body 8a. The blower pipe 31 is preferably positioned below the classification space 11. Further, it is desirable that the diameter of the air duct 31 is as small as possible so as not to obstruct the discharge of the fine particle group and the crushed particle group of the product size or to avoid the erosion of the air duct 31.

  As described above, the centrifugal crusher according to the second embodiment includes the axial airflow inlet passage 33a and the radial airflow outlet passage 34a in the lower housing 8 into which the crushed particles are introduced from the annular gap 7. An air flow supply duct 32 provided in parallel with the rotor rotation drive mechanism 6 and a blow pipe 31 for supplying air to the air flow supply duct 32 from an air blow source outside the crusher are provided. Therefore, the solid-gas two-phase swirling flow that has flowed in from the annular gap 7 and the airflow supplied from the air blowing source outside the crusher and sent out from the radial airflow outlet passage 34a of the airflow supply duct 32 are combined to generate centrifugal force. As a flow field for airflow classification based on the fluid resistance force, a smooth and sufficient swirling flow with sufficient airflow can be obtained that travels downward into the classification space 11 in the lower housing 8. Therefore, when the crushed particle group obtained in the crushing chamber 2 is classified into the fine particle group and the pulverized particle group of the product size, it can be classified with higher accuracy than before, and classification is performed with high processing capacity. be able to.

  FIG. 5 is a broken perspective view showing a configuration of a centrifugal crusher according to a third embodiment of the present invention. Here, in this 3rd Embodiment, the same code | symbol as FIG. 1 is attached | subjected to the same component as the centrifugal crusher shown in the said FIG. 1, description is abbreviate | omitted, and a different point is demonstrated.

  As shown in FIG. 5, an airflow supply duct 42 is disposed in the lower housing 8. The air flow supply duct 42 is provided adjacent to and in parallel with the rotor rotation drive mechanism unit 6, and extends in the vertical direction in parallel with the drive mechanism unit 6, and the upper end of the cylinder body 43. A hollow annular body 44 that is connected to the periphery, has an inner peripheral surface fixed to the outer peripheral surface of the rotor rotation drive mechanism 6, and has an outer peripheral surface opened over the entire circumference, and is positioned below the hollow annular body 44. It is connected to a cylindrical body 43, and is configured by a lower hollow annular body 45 whose inner peripheral surface is fixed to the outer peripheral surface of the rotor rotation driving mechanism 6 and whose outer peripheral surface is opened over the entire periphery.

Thereby, as shown in FIG. 5, the air flow supply duct 42 is adjacent to the rotor rotation drive mechanism portion 6 and is arranged in parallel with the axial air flow inlet passage 43 a extending in the vertical direction in parallel with the axis. extending radially in the radial direction communicating with the inlet passage 43a, and the radial airflow outlet passage 44a having an outlet opening 44a ₁ located along the inner periphery of the annular gap close to the 7 the clearance 7 on the tip, further, the A radial airflow outlet for a lower portion located below the distance G of the outlet passage 44a, communicated with an inlet passage 43a extending in the vertical direction, extending radially in the radial direction, and having an outlet opening 45a ₁ (vertical opening length H2) at the tip. And a passage 45a. The radial length L2 of the lower radial airflow outlet passage 45a is set to be equal to or shorter than the radial length L1 of the outlet passage 44a located above.

  Further, air from an air blow source (not shown) outside the crusher (for example, a blower) is supplied to the air flow supply duct 42 at the lower end portion of the axial air flow inlet passage 43a (cylindrical body 43) of the air flow supply duct 42. A blower pipe 31 extending in the radial direction is connected.

  As described above, the centrifugal crusher according to the third embodiment includes an axial airflow inlet passage that is arranged in parallel with the rotor rotation drive mechanism 6 in the lower housing 8 into which the crushed particles are introduced from the annular gap 7. 43a, an airflow supply duct 42 having a radial airflow outlet passage 44a and a lower radial airflow outlet passage 45a, and a blower pipe 31 for supplying air to the airflow supply duct 42 from an air blowing source outside the crusher. ing. Therefore, the solid-gas two-phase swirling flow that has flowed in from the annular gap 7 and the airflow supplied from the air blowing source outside the crusher and sent out from the radial airflow outlet passage 44a of the airflow supply duct 42 are combined together to classify the airflow. As a flow field for carrying out the above, a smooth and sufficient swirling flow with sufficient air volume can be obtained which travels downward into the classification space 11 in the lower housing 8. In addition, since the lower radial airflow outlet passage 45a is provided below the radial airflow outlet passage 44a, the speed turning in the horizontal direction does not cause a deceleration that deteriorates the classification accuracy as it goes to the lower portion of the classification space 11, and the turning for classification. A flow can be realized in the classification space 11. Therefore, when classifying the pulverized particle group obtained in the pulverization chamber 2 into the fine particle group and the pulverized particle group of the product size, classification can be performed with higher accuracy than before, and classification can be performed with high processing capacity. It can be performed.

  The present invention is not limited to the embodiments 1 to 3 described above, 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 a fracture perspective view showing composition of a centrifugal crusher by a 1st embodiment of the present invention. It is sectional drawing of the centrifugal crusher shown in FIG. It is sectional drawing for demonstrating the airflow supply duct in FIG. It is a fracture | rupture perspective view which shows the structure of the centrifugal crusher by 2nd Embodiment of this invention. It is a fracture | rupture perspective view which shows the structure of the centrifugal crusher by 3rd Embodiment of this invention. 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 piece deposition layer 5 ... Rotor 5a ... Release port 6 ... Rotary drive mechanism part for rotors 7 ... Circular gap 8 ... Lower housing 9 ... Product discharge port 10 ... Fine particle discharge port 11 ... Classification space 12 ... Airflow supply duct 13 ... Cylindrical body 13a ... Axial airflow inlet passage 14 ... Hollow torus 14a ... Radial airflow outlet passage 14a ₁ ... Outlet opening 31 ... Air blow pipe 32, 42 ... Airflow supply duct 33, 43 ... cylinder 33a, 43a ... axial airflow inlet passages 34, 44 ... hollow torus 34a, 44a ... radial airflow outlet passage 34a _1, 44a 1 _... hollow torus 45a ... radial airflow outlet for the lower outlet opening 45 ... lower Passage 45a ₁ ... exit opening

Claims (4)

  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 rotor that is supported by a rotary drive mechanism for a rotor to perform crushing and sizing by colliding with a colliding part, and a horizontally rotating rotor, communicated with the crushing chamber, and connected to the lower part of the upper housing. A lower housing in which the obtained crushed particle group is introduced from an annular gap between the rotor and the collision portion, and the rotary drive mechanism portion for the rotor are arranged in parallel in the lower housing, and the radial gap is radially formed in the annular gap. An air flow supply duct for supplying an air flow to be directed, and a plurality of discharges provided in the lower housing, each for discharging crushed particle groups having different particle size ranges to the outside of the crusher Centrifugal crusher, characterized in that it comprises a and.   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 rotor that is supported by a rotary drive mechanism for a rotor to perform crushing and sizing by colliding with a colliding part, and a horizontally rotating rotor, communicated with the crushing chamber, and connected to the lower part of the upper housing. The obtained crushing particle group has a lower housing that is introduced from an annular gap between the rotor and the collision part, an entrance opening at the lower end, and a shaft that is arranged in parallel with the rotary drive mechanism part for the rotor and extends vertically. A radial airflow outlet passage that communicates with the directional airflow inlet passage and radially extends in communication with the axial airflow inlet passage, and has an outlet opening located near the annular gap and along the inner circumferential edge of the annular gap. An air flow supply duct provided in the lower housing, and a plurality of outlets provided in the lower housing for discharging crushed particle groups having different particle size ranges to the outside of the crusher, respectively. A centrifugal crusher characterized by comprising.   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 rotor that is supported by a rotary drive mechanism for a rotor to perform crushing and sizing by colliding with a colliding part, and a horizontally rotating rotor, communicated with the crushing chamber, and connected to the lower part of the upper housing. A lower housing in which the obtained crushed particle group is introduced from an annular gap between the rotor and the collision portion, an axial airflow inlet passage that is arranged in parallel with the rotary drive mechanism portion for the rotor and extends in the vertical direction; and A radial airflow outlet passage communicating radially with the axial airflow inlet passage and extending radially, having an outlet opening located near the annular gap and along the inner peripheral edge of the annular gap; An airflow supply duct provided in the wing, a blower pipe connected to a lower end portion of the axial airflow inlet passage, for supplying air to the airflow supply duct from an air blower source outside the crusher, and the lower housing And a plurality of outlets for discharging crushed particle groups having different particle size ranges to the outside of the crusher.   The airflow supply duct further includes a lower radial airflow outlet passage that is positioned below the radial airflow outlet passage and guides an airflow that flows radially into the lower housing. The centrifugal crusher according to 2 or 3.

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