JP2016131909A - Vertical mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical mill where the deviation of the theoretical classification point of a separator having a rotary part is made as small as possible, an electric power consumption unit is improved, a milling amount is increased and the quality of a fine powder product is improved while reducing vibration.SOLUTION: In a vertical mill where a plurality of rotating milling rollers are arranged, a raw material supplied on a turntable is milled between the turntable and the milling rollers, granules made of the milled raw material are blown up by a gas introduced from a gas introduction port disposed below the turntable, the blown up granules are classified by a separator having a rotary part and the classified fine powders are taken out together with the gas from a product taking out port disposed at an upper casing housing the separator at the upper part of the turntable. The upper casing is provided with an upper case covering the upper part of the separator and having the product taking out port; and the upper case is formed so as to be eccentrically arranged from the rotational center axis of the separator.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vertical pulverizer that uses coal, oil coke, limestone, blast furnace slag, electric furnace slag, cement clinker, cement raw material, or a chemical product as a raw material, and particularly a vertical type capable of highly efficient classification and pulverization. Related to crusher.

  Conventionally, vertical pulverizers have been widely used as pulverizers for pulverizing coal, oil coke, and the like. In particular, in recent years, the demand for using fine powder obtained by finely pulverizing raw materials with a vertical grinder as a product is increasing. Such a vertical crusher is provided with a classification mechanism inside, and is configured so that a fine powder having a desired particle diameter can be taken out as a product (see Patent Document 1).

  As a vertical pulverizer having such a classification mechanism, the one disclosed in Patent Document 1 conveys and raises the pulverized raw material as powder by an air current blown from the lower casing of the pulverizer. At the same time, only a fine powder having a desired particle diameter is selected from the powder conveyed by the air current by the classification mechanism arranged in the upper casing in the vertical crusher.

  And the product which consists of a fine powder is manufactured by taking out the selected fine powder out of the apparatus from the product outlet of an upper casing as a product. In general, as such a classification mechanism, for example, a separator that is disposed above a rotary table and has a plurality of rotary blades as a rotary unit is known.

JP2013-193041A

  In the separator, a group of powder particles having a particle size distribution is classified into a product (fine powder) and a non-product (coarse powder) with a desired particle diameter as a boundary. The particle diameter serving as the boundary is referred to as “theoretical classification point”, and the ideal classification is uniform in the height direction and the circumferential direction of the rotating portion of the separator.

  The ideal classification point can be obtained by organizing the equation of motion of the powder particles based on, for example, the speed in the center direction and the speed in the turning direction between the rotating blades of the separator. However, in reality, the rotation speed of the rotating blades forms a substantially uniform turning speed field, but the center direction speed is not uniform in the circumferential direction, so that the logical classification point is biased particularly in the circumferential direction. End up.

  This deviation in the central speed is called a drift, and it has been found that it is mainly caused by the relationship between the arrangement of the product outlet and the rotation direction of the rotating part of the separator. As described above, the logical classification point is biased in the circumferential direction, so that the particle size distribution of the product particle size distribution is increased so as to have a wider particle size configuration than that originally desired. This may adversely affect product quality.

  It is also known that the logical classification point is biased, which causes a reduction in the performance of the vertical crusher. That is, the fine powder that should be selected and collected as a product is returned to the vertical crusher as a coarse powder at a certain position in the circumferential direction. In addition, extra energy consumption is increased for handling the returned powder, which not only causes a reduction in the amount of pulverization but also causes an increase in power consumption.

  Furthermore, when the amount of powder returned into the vertical grinder increases, the amount of powder on the rotary table increases, which may induce vibration of the grinder. In order to suppress such vibration, it is necessary to stop the operation of the vertical crusher, and the loss per operation unit becomes large.

  The present invention eliminates the problems caused by the prior art described above, reduces the bias of the theoretical classification point of the separator having a rotating part as much as possible, improves the power consumption, increases the pulverization amount, and reduces vibration. It is another object of the present invention to provide a vertical crusher that can improve the quality of fine powder products.

  The vertical crusher according to the present invention comprises a plurality of rotating crushing rollers and crushes the raw material supplied on the rotary table between the rotary table and the crushing roller, and from the crushed raw material. Are blown up by a gas introduced from a gas inlet provided below the rotary table, and the blown up powder particles are classified by a separator having a rotating part, and the classified fine powder is classified into the rotary table. A vertical crusher that takes out the gas together with the gas from a product outlet provided in an upper casing that accommodates the separator above, and the upper casing includes an upper case that covers the separator and has the product outlet. The upper case is formed so as to be eccentrically arranged from the rotation center axis of the separator.

  In one embodiment of the present invention, the upper case has a truncated cone-shaped base and a duct portion that protrudes from the top or the side of the base and reaches the product outlet, and the center of the base is The separator is arranged eccentrically from the rotation center axis of the separator.

  In another embodiment of the present invention, the upper casing includes a frustoconical lower case that covers the side of the separator, and the center of the lower case coincides with the rotation center axis of the separator.

  In another embodiment of the present invention, the upper case has one product outlet.

  In still another embodiment of the present invention, the upper case includes a rotating portion that rotates clockwise when the upper casing is disposed on the left side with the product outlet disposed on the left side and viewed in plan view. In the orthogonal coordinate system with the rotation center axis as the origin, the center point of the base is eccentrically arranged so that the center point of the base is located in the fourth quadrant and the center point of the product outlet is located in the third quadrant.

  In still another embodiment of the present invention, the upper case has an outer diameter of the rotating part of the separator D, a dimension in the height direction of the base part SH, and a center point of the base part in the orthogonal coordinate system. When the dimension in the X direction from the origin is SX and the dimension in the Y direction is SY, the dimensions of SX, SY, and SH are (a) 0.015 × D ≦ SX ≦ 0.080 × D [mm], (B) 0.015 × D ≦ SY ≦ 0.080 × D [mm], (c) 0.080 × D ≦ SH ≦ 0.20 × D [mm]. .

  According to the present invention, the deviation of the theoretical classification point of the separator having a rotating part is made as small as possible, the power consumption is improved, the pulverization amount is increased, and the quality of the fine powder product is improved while reducing the vibration. Can be made.

It is explanatory drawing which shows the whole structure of the vertical crusher which concerns on one Embodiment of this invention. It is a partial enlarged view of the same saddle type pulverizer. It is explanatory drawing which shows the state which looked at the partial horizontal cross section of the vertical crusher of FIG. 2 by planar view from upper direction. It is a partially enlarged view of a vertical crusher of a comparative example. It is explanatory drawing which shows the state which looked at the partial horizontal cross section of the vertical crusher of the comparative example by planar view from upper direction. FIG. 5 is a distribution diagram of theoretical classification points in the circumferential direction when the AA line cross section of FIGS. 2 and 4 is viewed in plan view from above. FIG. 5 is a distribution diagram of theoretical classification points in the circumferential direction when the cross section taken along the line B-B in FIGS. 2 and 4 is viewed from above.

  Hereinafter, a vertical crusher according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an explanatory view showing the overall configuration of a vertical grinder according to an embodiment of the present invention, and FIG. 2 is a partially enlarged view of the vertical grinder. FIG. 3 is an explanatory diagram showing a state in which a partial horizontal section of the vertical crusher of FIG. 2 is viewed from above in a plan view.

  As shown in FIGS. 1 to 3, the vertical crusher 1 has, as a power source, for example, a rotary table motor 2 provided on the side of the speed reducer 4 and an upper case 21 of the upper casing 20 described later. And a rotor motor 3 provided on the rotor. The reduction gear 4 decelerates and transmits the rotational force from the rotary table motor 2.

  The vertical crusher 1 includes a rotary table 5 that is disposed on the speed reducer 4 and is rotationally driven by the rotary table motor 2 via the speed reducer 4, and a classification mechanism that is disposed above the rotary table 5. And a separator 30 having a rotating rotor 31 as a rotating part. The rotor motor 3 rotationally drives the rotary rotor 31 of the separator 30. In addition, although the separator 30 of this embodiment is provided with the rotation rotor 31 which is a rotation part, and the fixed blade | wing 32, what the separator itself rotates without providing the fixed blade | wing 32 can also be employ | adopted.

  The vertical crusher 1 includes a control device 18 that controls the operation of the motors 2 and 3. The control device 18 controls the rotation speed and the rotation speed of the rotary table 5 and the rotary rotor 31 by controlling the operations of the motors 2 and 3. Moreover, the vertical crusher 1 is provided with a casing 10 that accommodates these components other than the motors 2 and 3 therein.

  The casing 10 includes, in the height direction of the vertical crusher 1, a lower casing 19 that houses from the lower end of the speed reducer 4 to the lower end of the separator 30, and an upper casing that covers the upper side of the vertical crusher 1 from the lower end of the separator 30. 20

  The lower casing 19 is formed, for example, such that a predetermined portion in the height direction from the side of the turntable 5 to the lower side of the separator 30 has a cylindrical shape. The upper casing 20 includes, for example, a lower case 22 that covers and accommodates the side of the separator 30 (from the lower end to the upper end), and an upper case 21 that covers the separator 30 and has a product outlet 29.

  The upper casing 20 includes an annular short path prevention plate 40 provided so as to extend slightly inward and upward from the end of the rotary rotor 31 of the separator 30 inside the vicinity of the boundary between the upper case 21 and the lower case 22. The seal plate 41 is formed so as to extend slightly downward from the short path prevention plate 40 toward the side of the rotary rotor 31.

  The lower case 22 is formed in a truncated cone shape, for example. In addition, the lower case 22 can take various shapes such as a polygonal frustum shape and an elliptical frustum shape. The center of the lower case 22 coincides with the rotation center axis of the rotary rotor 31 of the separator 30, for example. On the other hand, the upper case 21 has, for example, an eccentric frustoconical base portion 21a and a duct portion 21b that reaches the product outlet 29 that protrudes above or on the side surface of the base portion 21a. The upper case 21 has one product outlet 29.

  Here, the eccentric truncated cone shape in the base portion 21a of the upper case 21 refers to a shape in which the center point of the bottom surface and the center point of the upper surface of the truncated cone are shifted in the height direction. Further, for example, a rectifying plate (not shown) may be attached to the inside of the duct portion 21b reaching the product outlet 29 of the upper case 21. The shape of the base 21a of the upper case 21 is not limited to the eccentric truncated cone shape as described above, and various shapes can be adopted.

  As shown in FIG. 3, the upper casing 20 is formed so that the center P <b> 1 of the upper case 21 is eccentrically arranged from the rotation center axis P <b> 2 of the rotary rotor 31 of the separator 30, and is connected to the lower casing 19. . Specifically, the upper case 21 has the rotation center axis of the separator 30 having, for example, a rotating rotor 31 that rotates in the clockwise direction when the upper casing 20 is disposed with the product outlet 29 on the left side and viewed from above in a plan view. In the orthogonal coordinate system with P2 as the origin, the center of the upper case 21 (center point of the base portion 21a) P1 is positioned in the fourth quadrant, and the center point P3 of the product outlet 29 of the duct portion 21b is positioned in the third quadrant. Are arranged eccentrically.

  In other words, when the lower case 22 is formed in the shape of a truncated cone that forms a concentric circle with the separator 30, in other words, the center of the lower case 22 (that is, the rotation center axis P <b> 2) It means that the center point P1 of the base 21a in the upper case 21 is eccentric.

Note that the upper case 21 specifically has, for example, an outer diameter of the rotary rotor 31 of the separator 30 as D (see FIG. 2), and the height of the base 21 a from the upper end of the separator 30 to the upper end of the base 21 a of the upper case 21. The dimension in the vertical direction is SH (see FIG. 2), the dimension in the X direction from the origin (rotation center axis P2) of the center point P1 of the base 21a in the orthogonal coordinate system is SX, and the dimension in the Y direction is SY (FIG. 3). Reference) is formed so as to satisfy the following conditions (a) to (c).
(A) 0.015 × D ≦ SX ≦ 0.080 × D [mm]
(B) 0.015 × D ≦ SY ≦ 0.080 × D [mm]
(C) 0.080 × D ≦ SH ≦ 0.20 × D [mm]

  The center P1 of the upper case 21 is eccentrically arranged in this way from the rotation center axis P2 of the rotary rotor 31 of the separator 30, thereby suppressing the bias of the logical classification point d of the separator 30 to be described later, and the vertical crusher 1 It is possible to improve the quality of the fine powder product while reducing the vibration by improving the power intensity of the product and increasing the pulverization amount.

  On the other hand, the rotary table 5 shown in a partial cross section in FIG. 1 is configured to include a circular central region and an annular roller rolling region around it. Above the central region of the rotary table 5, a cylindrical chute 6 extending in the vertical direction from the upper part of the vertical crusher 1 toward the center of the rotary table 5 is provided. A new raw material (cement clinker or the like) is supplied to the chute 6 from above.

  On the outer peripheral side of the chute 6, a cone 7 for supplying an internal circulation raw material (powder particles) is provided. The lower ends of the chute 6 and the cone 7 are arranged so as to constitute the same surface, for example. Accordingly, the new raw material and the internal circulation raw material are stably fed and supplied onto the central region of the turntable 5 via the chute 6 and the cone 7. Each raw material supplied onto the central area of the rotary table 5 is guided to the roller rolling area by the rotational force of the rotary table 5.

  Further, the vertical crusher 1 includes, for example, a plurality of crushing rollers 8 that can roll by following the rotation of the rotary table 5 on the roller rolling area of the rotary table 5, and a plurality of auxiliary rollers (not shown). Yes. For example, the crushing roller 8 is arranged at a position that bisects the roller rolling area, and the auxiliary roller is arranged between the crushing rollers 8 and at a position that bisects the roller rolling area.

  The crushing roller 8 is connected to, for example, a piston rod 11 </ b> A of the hydraulic cylinder 11 via arms 9 and 9 </ b> A attached to the lower casing 19 so as to be swingable by a shaft. By operating this hydraulic cylinder 11, the crushing roller 8 is pressed against the roller rolling area of the rotary table 5 to give a crushing force to the raw material layer.

  The auxiliary roller is also swingably supported with the same configuration. The pulverizing roller 8 mainly pulverizes the raw material, and the auxiliary roller is mainly used for degassing the raw material layer. Each raw material that is supplied onto the central area of the rotary table 5 and supplied to the roller rolling area and passes between the rotary table 5, the pulverizing roller 8, and the auxiliary roller in this roller rolling area is outside the rotary table 5. It is dammed by a dam ring 12 provided around the periphery. For example, the height of the dam ring 12 is adjustable.

  Between the outer peripheral part of the turntable 5 and the lower casing 19, the annular channel | path 13 used as the blowing part of gas is formed. The lower casing 19 is provided with a gas introduction duct 14 for introducing gas into the annular passage 13 from an exhaust fan provided outside. Further, the lower casing 19 is provided with a lower take-out duct 15 for taking out the raw material that has fallen into the annular passage 13 without being sufficiently pulverized.

  In the lower case 22 of the upper casing 20, a separator 30 is disposed in the inner region of the cone 7 so as to surround the chute 6. The separator 30 rotates the rotating rotor 31 having rotating blades together with a rotating cylinder rotated by, for example, a belt drive by the rotor motor 3, so that the raw material (powder particles) pulverized by the rotary table 5 and the pulverizing roller 8 is used. Classification into products (fine powder) of a predetermined particle size. A fixed blade 32 is provided at a position corresponding to the rotary rotor 31 of the separator 30 in the upper part of the cone 7.

  And from the product outlet 29 provided in the upper case 21 of the upper casing 20, the finely pulverized fine powder blown up by the gas flow and passed through the separator 30 (the fixed blade 32 and the rotating rotor 31) is used as the product. It is taken out. The vertical crusher 1 configured as described above operates, for example, as follows.

  First, a new raw material is supplied from the chute 6 onto the central area of the rotary table 5 while the rotary table 5 is rotated. The supplied new raw material receives a centrifugal force in the radial direction of the table by the rotation of the rotary table 5 and moves while sliding on the rotary table 5 in the outer peripheral direction. During movement, the raw material receives a force in the rotational direction by the rotary table 5, slides between the rotary table 5 and rotates somewhat slower than the rotational speed of the rotary table 5.

  In this way, when the force obtained by synthesizing two forces in the radial direction and the rotation direction of the rotary table 5 acts on the raw material, the raw material rolls from the central region while drawing a spiral trajectory on the rotary table 5. Guided to the area. The raw material thus guided to the roller rolling area enters between the grinding roller 8 and the auxiliary roller and the rotary table 5 from a direction that forms an angle with the roller axial direction. In this way, it is bitten, degassed and pulverized, and dammed by the dam ring 12.

  On the other hand, gas such as air or hot air from the gas introduction duct 14 blows up from the annular passage 13 into the lower casing 19. Among the raw materials (powder particles) that have passed over the dam ring 12 after pulverization, the raw materials that scatter during the pulverization and float in the machine, or the internal circulation raw materials (powder particles) that have a particularly small particle size It rides on the gas stream and is blown upward.

  The raw material blown upward rises in the lower casing 19 along with the gas, and is subjected to a classification action by the fixed blade 32 and the rotary rotor 31 of the separator 30 located in the upper casing 20. Thereby, the thing (fine powder) of a predetermined particle size is discharged | emitted as a product from the product outlet 29 with gas. At the same time, the coarse powder particles fall again on the rotary table 5 via the cone 7 as an internal circulation material and are pulverized.

  Further, among the raw materials that have passed over the dam ring 12, for example, those having extremely large particle diameters or extremely heavy materials including metals fall from the annular passage 13 to the lower side of the vertical crusher 1, and the lower part. It is taken out from the take-out duct 15 to the outside. The taken out raw material is returned to the chute 6 again from a conveyance line (not shown) as necessary, and is pulverized by the vertical pulverizer 1 by external circulation.

  The applicant obtained the following knowledge as a result of intensive studies to try to improve the classification efficiency in the vertical crusher 1 operating as described above. First, an essential simulation fluid analysis was performed on the classification point of the separator 30. As a result, it has been found that the bias of the logical classification point becomes remarkable in the circumferential direction of the separator 30. By suppressing this bias, the classification efficiency of the separator 30 can be improved. Hereinafter, the results of the fluid analysis of both of the vertical crusher 1 of the present embodiment and a comparative example of a conventional vertical crusher will be compared and described.

  FIG. 4 is a partially enlarged view of a vertical crusher of a comparative example, and FIG. 5 is an explanatory view showing a state in which a partial horizontal cross section of the vertical crusher of the comparative example is viewed from above. 6 is a distribution diagram of theoretical classification points in the circumferential direction when the AA line cross section of FIGS. 2 and 4 is viewed in plan view from above, and FIG. 7 is a cross section along the BB line of FIGS. Is a distribution map of theoretical classification points in the circumferential direction as viewed from above in plan view.

  That is, FIG.6 and FIG.7 has shown the distribution map of the logic classification point of the AA line cross section in the vertical crusher 1 of an Example, and the vertical crusher of a comparative example. The AA line cross section and the BB line cross section indicate a horizontal cross section near the lower end of the separator 30 and a horizontal cross section near the upper end, respectively. 4 and 5, the same components as those in the above-described embodiment (FIGS. 1 to 3) are denoted by the same reference numerals, and redundant description is omitted below.

  First, a comparative example will be described. As shown in FIGS. 4 and 5, the vertical crusher 100 of the comparative example is formed in a truncated cone shape that is concentric with both the lower case 22 and the upper case 21 of the upper casing 20. Therefore, the center P1 of the upper case 21 and the rotation center axis P2 of the rotary rotor 31 of the separator 30 as shown in FIG. The rotating rotor 31 of the separator 30 rotates clockwise as described above.

The logical classification point of the separator 30 is based on the equation of motion of the particles of the granular material, the speed (center direction speed) vg toward the center between the rotating blades of the rotating rotor 31 and the speed (swirl) toward the rotating direction of the rotating rotor 31. By organizing according to (direction velocity) vθ, it can be expressed as the following Expression 1.
d∝vg ^0.5 / vθ (Formula 1)
d: Theoretical classification point (μm)
vθ: Speed in turning direction (m / s)
vg: Center direction speed (m / s)

  Note that the center direction speed vg depends on the amount of airflow passing through the rotary blades of the rotary rotor 31, and the turning direction speed vθ depends on the rotational speed of the rotary rotor 31. For this reason, the theoretical classification point d (that is, the product granularity) can be easily manipulated by controlling the rotation speed of the rotary rotor 31 under the condition that the passing air flow rate is constant.

  This logical classification point d is an ideal classification when it is uniform in the height direction and the circumferential direction of the separator 30. However, since the rotation speed of the rotary rotor 31 forms a substantially uniform turning speed field (vθ = constant), the center direction speed vg is not uniform in the circumferential direction. In this case, a deviation (drift) in the central direction speed vg occurs.

  Such drift is mainly caused by the relationship between the arrangement of the duct portion 21b up to the product outlet 29 and the rotation direction of the rotary rotor 31 of the separator 30. Therefore, as shown in FIG. 6 and FIG. 7, both the vertical crusher 100 of the comparative example and the vertical crusher 1 of the example are compared with the ideal classification that is the average value of the theoretical classification points d in the circumferential direction. Actually, the distribution of each theoretical classification point d is biased.

  For example, like the vertical crusher 100 of the comparative example, the duct portion 21b to the product outlet 29 has a general shape and arrangement, and the center P1 of the upper case 21 and the rotation center axis of the rotary rotor 31 of the separator 30 When P2 matches, airflow wraparound and short path flow are generated as shown by arrows F1 and F2 in FIGS. 4 and 5, respectively. This air wraparound and short path flow are also generated in the vertical crusher 1 of the embodiment, for example.

  Due to the influence of the air flow, the theoretical classification point d tends to increase on the left side of the upper casing 20 when the product outlet 29 is viewed from the front in the cross section along the line AA in the vicinity of the lower end of the separator 30 of the comparative example. . That is, as shown in FIG. 6, the theoretical classification point d of the comparative example is very large in a region where the influence of airflow wraparound is significant. This is because the airflow turns around with the rotation of the rotating rotor 31 that rotates clockwise, and the center direction speed vg increases in the left region when the product outlet 29 is viewed in front.

  On the other hand, due to the influence of the short path flow, the theoretical classification is performed on the product outlet 29 side of the upper casing 20 when the product outlet 29 is viewed from the front in the cross section taken along the line BB near the upper end of the separator 30 of the comparative example. The point d tends to increase. That is, as shown in FIG. 7, the theoretical classification point d of the comparative example is very large in the region where the influence of the short path flow is significant. This is because a short path flow occurs in a region immediately below the duct portion 21b reaching the product outlet 29 as indicated by an arrow F2 in FIGS.

  As in this comparative example, the theoretical classification point d is biased in the circumferential direction, which increases the particle size width of the product particle size distribution. Thereby, since the particle size distribution of the product has a wider particle size configuration than what is originally desired, there is a concern that the quality may be adversely affected. Moreover, the theoretical classification point d is biased, and the performance of the pulverizer is lowered. That is, the fine powder that should be taken out as a product is returned to the inside as a coarse powder in the region where the theoretical classification point d in the upper casing 20 is large. This causes extra energy consumption related to the operation of the pulverizer, causing not only a decrease in the pulverization amount but also an increase in the power consumption rate. Moreover, when the amount of the returned granular material increases, the raw material layer on the turntable 5 increases and vibration is induced. In order to converge this vibration, it is necessary to stop the operation from the viewpoint of equipment protection, which causes a great damage to the operation.

  On the other hand, in the configuration in which the center P1 of the upper case 21 and the rotation center axis P2 of the rotary rotor 31 of the separator 30 are eccentrically arranged as in the vertical crusher 1 of the embodiment, FIGS. As shown in FIG. 7, the theoretical classification point d is very small compared to the comparative example in the region where the influence of the airflow wraparound is remarkable and the region where the influence of the short path flow is remarkable. In addition, the overall distribution of the theoretical classification points d in the circumferential direction is less biased than the comparative example. Therefore, according to the vertical crusher 1 of the embodiment, the adjustment of the particle size of the product becomes more reliable and easy.

  Thus, in the vertical crusher 1 of the embodiment, the deviation of the theoretical classification point d of the separator 30 can be made as small as possible. That is, the influence of the airflow accompanying the rotation of the rotary rotor 31 can be reduced near the lower end of the separator 30, and the influence of the short path flow can be reduced near the upper end.

  Thereby, the particle size width of the particle size distribution of the product can be reduced, and the quality of the product can be improved. Moreover, since the powder particles returned to the inside of the pulverizer can be reduced, the power consumption can be improved while increasing the pulverization amount, and the generation of vibrations can be reduced. Thus, according to the vertical pulverizer 1, the theoretical classification point d of the separator 30 can be made uniform in the pulverizer, so that the quality of the product can be improved.

  As mentioned above, although embodiment of this invention was described, this embodiment is shown as an example and is not intending limiting the range of invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1,100 Vertical crusher 2 Motor for table 3 Motor for rotor 4 Reduction gear 5 Rotary table 6 Chute 7 Cone 8 Crushing roller 10 Casing 12 Dam ring 13 Annular passage 14 Gas introduction duct 15 Lower take-out duct 18 Controller 19 Lower casing 20 Upper casing 21 Upper case 21a Base 21b Duct portion 22 Lower case 29 Product outlet 30 Separator 31 Rotating rotor 32 Fixed blade

Claims (6)

A raw material provided on the rotary table having a plurality of rotating crushing rollers is pulverized between the rotary table and the pulverizing roller, and the granular material made of the pulverized raw material is below the rotary table. The powder is blown up by the gas introduced from the gas introduction port provided in the gas, and the blown up powder particles are classified by a separator having a rotating part, and the classified fine powder is placed on the upper casing that houses the separator above the rotary table. A vertical crusher that takes out together with the gas from a product outlet provided,
The upper casing is
A vertical crusher comprising: an upper case that covers the top of the separator and that has the product outlet, and the upper case is formed eccentrically with respect to the rotation center axis of the separator. The upper case has a frustoconical base portion and a duct portion that protrudes from the base portion or on the side surface to reach the product outlet.
The vertical crusher according to claim 1, wherein the center of the base is eccentrically arranged with respect to a rotation center axis of the separator. The upper casing includes a truncated conical lower case that covers the side of the separator,
The vertical crusher according to claim 1 or 2, wherein a center of the lower case coincides with a rotation center axis of the separator. The upper case is
The vertical crusher according to claim 1, wherein the vertical crusher has one product outlet. The upper case is
In the orthogonal coordinate system when the rotation center axis of the separator having the rotation part having a rotation part that rotates clockwise when the product outlet is disposed on the left side when viewed from above with the product casing on the left side, the base part 5. The vertical crusher according to claim 1, wherein the vertical crusher is eccentrically arranged so that a center point of the product is located in a fourth quadrant and a center point of the product outlet is located in a third quadrant. . The upper case is
The outer diameter of the rotating portion of the separator is D, the dimension in the height direction of the base is SH, the dimension in the X direction from the origin of the center point of the base in the orthogonal coordinate system is SX, and the dimension in the Y direction is SY. , The dimensions of SX, SY and SH are
(A) 0.015 × D ≦ SX ≦ 0.080 × D [mm],
(B) 0.015 × D ≦ SY ≦ 0.080 × D [mm],
(C) 0.080 × D ≦ SH ≦ 0.20 × D [mm]
The vertical crusher according to claim 5, wherein the vertical crusher is formed so as to satisfy each of the following conditions.

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