JP6657589B2 - Vertical mill and its operation method - Google Patents

Description

  The present invention relates to a vertical pulverizer for pulverizing coal, oil coke, limestone, blast furnace slag, electric furnace slag, cement clinker, cement raw material, or a chemical product as a raw material, and a method of operating the same, and in particular, to improve product quality and save energy. The present invention relates to a vertical pulverizer capable of performing high-efficiency classification and pulverization while achieving high efficiency, and an operation method thereof.

  Conventionally, a vertical pulverizer has been widely used as a pulverizer for pulverizing coal, oil coke, and the like. In particular, in recent years, demand for using fine powder obtained by finely pulverizing raw materials by a vertical pulverizer as a product has been increasing. Such a vertical pulverizer is provided with an annular passage for blowing up a swirling flow (gas flow) by gas therein and a classification mechanism for classifying fine powder conveyed on the swirling flow. It is configured such that a fine powder having a desired particle size can be taken out as a product (see Patent Documents 1 to 3).

  As vertical crushers having such an annular passage and a classifying mechanism, those disclosed in Patent Documents 1 to 3 rotate by a gas flow blown from an annular passage provided in a lower casing of the crusher. The raw material pulverized on the table is transported as powder and raised. At the same time, only a fine powder having a desired particle size is selected from the powder conveyed by the gas flow by a classification mechanism arranged in an upper casing in the vertical pulverizer.

  Then, by taking out the selected fine powder as a product from the product outlet of the upper casing to the outside of the machine, a product composed of the fine powder is manufactured. Generally, as such an annular passage, a blade ring provided along the outer periphery of a rotary table in a lower casing and variably adjusting the inclination angle of a plurality of blades arranged in an annular shape is known. Further, as such a classification mechanism, there is known a separator which is disposed above a rotary table and has a plurality of rotary blades as rotary units.

JP-A-61-78445 JP-A-62-176554 JP 2013-193041 A

  In the separator, a group of powder particles having a particle size distribution is selected into a product (fine powder) and a non-product (coarse powder) based on a desired particle size. The particle diameter at this boundary is referred to as a “theoretical classification point”, and ideal classification is that the particles are uniform in the height direction and the circumferential direction of the rotating part of the separator.

  The theoretical classification point can be obtained by arranging the equation of motion of the particles of the powder 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 practice, a substantially uniform swirl velocity field is formed by the rotation of the rotating blades, but the velocity in the central direction is not uniform in the circumferential direction. Will happen.

  This deviation in the central direction speed is called a drift, and mainly depends on the relationship between the arrangement of the product outlet and the rotation direction of the rotating part of the separator, the arrangement of the gas intake duct in the lower casing, the blade ring or each blade, and the like. It is known to be caused. As described above, since the theoretical classification points are biased in the circumferential direction, the particle size distribution of the particle size distribution of the product increases so as to have a wider particle size configuration than originally desired. This may adversely affect the quality of the product.

  It is also known that the deviation of the theoretical classification point causes a decrease in the performance of the vertical mill. That is, the fine powder that should be originally sorted and recovered as a product is returned to the vertical pulverizer as a coarse powder at a certain position in the circumferential direction. In addition, unnecessary energy consumption for handling the returned powder increases, which not only reduces the amount of pulverization but also increases the power consumption.

  Furthermore, when the amount of powder returned to the vertical crusher increases, the amount of powder on the rotary table increases, which may cause vibration of the crusher. In order to suppress such vibrations, the operation of the vertical pulverizer must be stopped, resulting in a large loss in operation units. It is known that it is effective to provide a blade ring in the lower casing as one measure against the deviation of the theoretical classification point causing such various problems.

  That is, the blade ring serves as a gas flow resistance between the gas intake duct provided in the lower casing of the vertical crusher and the inside of the crusher. In addition, the blade ring forms a swirl of the gas flow in the space between the rotating table and the separator, so that the gas can more easily flow into the separator. Thereby, the drift caused by the arrangement of the gas intake duct is reduced.

  The effect of mitigating drift due to the blade ring is that the smaller the inclination angle of each blade, the smaller the opening area between the blades, so the effect can be increased with the increase in the wind speed of the gas passing through the blades. it can. On the other hand, the pressure loss in the blade ring accounts for about 60% to about 70% of the pressure loss of the whole crusher.

  For this reason, the pressure loss of the crusher increases as the inclination angle of each blade is reduced and the wind speed of the gas passing through the blades is increased, and the power consumption of the gas introduction fan for introducing gas into the gas intake duct is increased. It leads to that. In other words, the effect of increasing the efficiency by enlarging the swirling of the gas flow and making the theoretical classification point uniform in the circumferential direction and the effect of reducing the efficiency by increasing the power consumption are simultaneously generated and conflict with each other. Becomes

  As described above, it is necessary to design the inclination angle of each blade so that the conflicting effects are optimally balanced, but in an actual operation, the optimal inclination of the blade depends on various factors such as raw materials to be pulverized and conditions. The angles are different. In addition, if the environment inside the crusher changes, such as accumulation of dust in the gas intake duct, with the elapse of time after the operation of the crusher, there is a concern that the balance of the gas taken into the crusher also changes.

  An object of the present invention is to solve the above-mentioned problems caused by the prior art, and to provide a vertical pulverizer capable of high-efficiency classification and pulverization while improving product quality and saving energy, and an operation method thereof. .

  The vertical pulverizer according to the present invention includes a plurality of rotating pulverizing rollers, and pulverizes a raw material supplied on a rotary table between the rotatable table and the pulverizing roller. A vertical crusher that takes out from a product outlet provided above the rotary table by a gas flow, comprising: a blade ring in which a plurality of blades are annularly arranged along an outer periphery of the rotary table; and A tilt angle adjusting mechanism for varying the tilt angle of the blade, a separator having a rotating part while classifying the raw material blown up by the gas flow introduced into the machine through the blade ring, and an upper casing for accommodating the separator in the machine. A pressure sensor disposed at a plurality of locations of the upper casing along the circumferential direction of the rotating portion of the separator, Calculating a deviation of a pressure loss in a circumferential direction of the separator of a gas flow flowing in the machine based on detection information from each pressure sensor, and adjusting the inclination angle so that the deviation indicated by the calculation result is within a predetermined value range. And an angle controller for adjusting the inclination angle of the blade by controlling the inclination angle of the blade.

  In one embodiment of the present invention, the tilt angle adjusting mechanism includes a link mechanism that connects a predetermined number of blades of the plurality of blades so that the tilt angle is simultaneously variable, and a motor that drives the link mechanism. Is provided.

  In another embodiment of the present invention, the pressure sensors are arranged at equal intervals along a circumferential direction of the rotating portion of the separator.

  In still another embodiment of the present invention, the pressure sensors are arranged so as to correspond to the vicinity of the upper end and the vicinity of the lower end of the separator in the horizontal direction and to form a pair in the vertical direction.

  In still another embodiment of the present invention, the angle control unit variably adjusts an inclination angle of the blade within a range of 35 ° to 80 ° with respect to a table upper surface of the rotary table.

  In still another embodiment of the present invention, the upper casing includes an upper case that covers the upper part of the separator and has the product outlet, and the upper case is eccentrically arranged from a rotation center axis of the separator. Is formed.

  In still another embodiment of the present invention, the upper case has a truncated cone-shaped base, and a duct extending to the product outlet protruding above or on the side of the base, and a center of the base. Are eccentrically arranged from the rotation center axis of the separator.

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

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

  In still another embodiment of the present invention, the upper case is configured such that the upper casing is provided with the product outlet on the left side and the separator has a rotating part that rotates clockwise when viewed from above in plan view from above. In an orthogonal coordinate system where the center axis is the origin, the base is eccentrically arranged such that the center of the base is located in the fourth quadrant and the center 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 D of a rotating part of the separator, a height dimension of the base SH, and an origin of a center point of the base in the orthogonal coordinate system. When the dimension in the X direction from is SX and the dimension in the Y direction is SY, the dimensions of the SX, SY and SH are (a) 0.015 × D ≦ SX ≦ 0.080 × D [mm], ( b) 0.015 × D ≦ SY ≦ 0.080 × D [mm], and (c) 0.080 × D ≦ SH ≦ 0.20 × D [mm].

  The method of operating a vertical pulverizer according to the present invention comprises a method of pulverizing a raw material supplied on a rotary table with a plurality of rotating pulverizing rollers, between the rotatable table and the pulverizing roller. Operating the vertical pulverizer to remove the raw material from a product outlet provided above the rotary table by a gas flow, wherein a plurality of blades whose tilt angles are variable by a tilt angle adjusting mechanism are provided on the outer periphery of the rotary table. Through a blade ring arranged annularly along, the raw material is blown up by a gas flow introduced into the machine, and when the blown up raw material is classified by a separator having a rotating unit and taken out from the product outlet, the rotating unit of the separator is Based on detection information from pressure sensors arranged at a plurality of locations on the upper casing along a circumferential direction, a gas flow Calculating a deviation of the pressure loss in a circumferential direction of the separator, and controlling the inclination angle adjusting mechanism so as to adjust the inclination angle of the blade so that the deviation indicated by the calculation result falls within a predetermined value range. .

  According to the present invention, highly efficient classification and pulverization can be performed while improving the quality of products and saving energy.

It is an explanatory view showing the whole vertical crusher composition concerning a 1st embodiment of the present invention. It is a partially expanded view of the same vertical grinder. FIG. 3 is an explanatory view showing a state in which a partial horizontal cross section of the vertical crusher of FIG. 2 is viewed from above in plan view. It is a top view which shows the blade ring and inclination-angle adjustment mechanism of the vertical grinder. FIG. 5 is an enlarged sectional view taken along line BB of FIG. 4. FIG. 5 is an enlarged sectional view taken along line CC of FIG. 4. It is a figure which shows the longitudinal cross-sectional structure between the blades of the blade ring of the vertical grinder. It is a flowchart which shows the blade inclination-angle adjustment process of the vertical grinder. It is a distribution diagram of the pressure loss calculated in the blade inclination angle adjustment processing of the vertical grinder. FIG. 3 is a distribution diagram of theoretical classification points of Comparative Example 1 and Example 1 in a circumferential direction when a cross section taken along line AA of FIG. 2 is viewed from above in a plan view. It is explanatory drawing which shows the whole structure of the modification of the vertical crusher which concerns on the 1st Embodiment of this invention. It is an explanatory view showing the whole composition of the vertical type crusher concerning a 2nd embodiment of the present invention. It is a partially expanded view of the same vertical grinder. It is explanatory drawing which shows the state which looked at the partial horizontal cross section of the vertical grinder of FIG. 13 from above from above. FIG. 14 is a distribution diagram of theoretical classification points of Comparative Example 2 and Example 2 in the circumferential direction when the cross sections taken along line DD of FIGS. 2 and 13 are viewed from above in plan view. FIG. 14 is a distribution diagram of theoretical classification points of Comparative Example 2 and Example 2 in the circumferential direction when the cross sections taken along line EE of FIGS. 2 and 13 are viewed from above in plan view.

  Hereinafter, a vertical pulverizer according to an embodiment of the present invention and a method of operating the same will be described in detail with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is an explanatory view showing the entire configuration of a vertical crusher according to a first embodiment of the present invention, and FIG. 2 is a partially enlarged view of the vertical crusher. 3 is an explanatory view showing a partial horizontal cross section of the vertical crusher of FIG. 2 viewed from above in plan view, and FIG. 4 is a plan view showing a blade ring and an inclination adjusting mechanism of the vertical crusher. FIG. 5 is an enlarged sectional view taken along line BB of FIG. 4, FIG. 6 is an enlarged sectional view taken along line CC of FIG. 4, and FIG. FIG.

  As shown in FIGS. 1 to 3, a vertical pulverizer 1 according to a first embodiment includes, as power sources, for example, a rotary table motor 2 provided on a side of a speed reducer 4 and an upper casing described later. 20 and a rotor motor 3 provided in the vicinity of an upper case 21. The speed reducer 4 reduces the rotational force from the rotary table motor 2 and transmits it to a rotary table 5 described later. The rotor motor 3 transmits a rotational force to a later-described rotary rotor 31 via a drive belt 3a.

  The vertical pulverizer 1 includes a rotary table 5 disposed on a speed reducer 4 and driven to rotate by a rotary table motor 2 via the speed reducer 4, and a classifier disposed above the rotary table 5. And a separator 30 having a rotating rotor 31 as a rotating unit as a mechanism. Although the separator 30 in the first embodiment is configured to include the rotating rotor 31 that is a rotating unit and the fixed blade 32, a separator in which the separator itself rotates without the fixed blade 32 may be employed. .

  Further, as shown in FIGS. 4 to 6, the vertical crusher 1 includes a blade ring 50 in which a plurality of blades 51 are annularly arranged along the outer circumference of the turntable 5. The blade ring 50 constitutes an annular passage that serves as a gas blowing section as a whole. The turntable 5 rotates, for example, in a clockwise direction as viewed from above (in a direction indicated by an arrow R in FIGS. 4 and 7). The vertical crusher 1 is provided on the outer peripheral side of the blade ring 50, and is connected to a plurality of angle adjusting motors 61 as an inclination angle adjusting mechanism for varying an inclination angle of each blade 51. And a plurality of link mechanisms 62 provided.

  In the first embodiment, eight angle adjusting motors 61 are provided at equal intervals outside the lower casing frame 19 a on the outer peripheral side of the blade ring 50. The link mechanisms 62 are provided at eight positions between the outer ring portion 53 of the blade ring 50 and the lower casing frame 19a in accordance with the arrangement of the angle adjusting motor 61.

  The blade ring 50 can be adjusted by arranging a plurality of blades 51 equally circumferentially between the inner ring portion 52 and the outer ring portion 53, and changing the inclination angle α (see FIG. 7) of each blade 51. It is configured to be arranged as follows. Each blade 51 is arranged, for example, such that the upper end side thereof is inclined toward the rotation direction of the turntable 5, and gas introduced from outside through the gas introduction duct 14 passes through the opening 54 between each blade 51 and enters the machine. Can be blown up.

  As shown in FIG. 7, each blade 51 of the blade ring 50 simultaneously changes the inclination angle α for every predetermined number. As shown in FIG. 6, the link mechanism 62 includes a plurality of vertical arms 65 rotatably connected to each blade 51 and a plurality of horizontal arms 64 slidably connected to the vertical arm 65. And

  Each horizontal arm 64 is connected to an adjustment ring 63 slidable along the outer circumference of the blade ring 50. As shown in FIG. 5, the angle adjustment motor 61 is connected to the adjustment ring 63 via a vertical arm 65a and a horizontal arm 64a at the center of each link mechanism 62, and a main rod 66 connected to the blade 51. Is rotated.

  Therefore, in the tilt angle adjusting mechanism configured as described above, when the angle adjusting motor 61 rotates the main rod 66, the vertical arm 65a and the horizontal arm 64a connected to the main rod 66 slide the adjustment ring 63. Let it. The horizontal arm 64 and the vertical arm 65 move according to the sliding movement amount of the adjustment ring 63, and simultaneously change the inclination angle α of the predetermined number of blades 51 for each link mechanism 62.

  As shown in FIG. 1, the vertical crusher 1 includes a control device 18 for controlling the operations of the rotary table motor 2 and the rotor motor 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. The vertical pulverizer 1 includes a casing 10 that forms a space for accommodating each component such as the rotary table 5 and the separator 30 inside.

  In the first embodiment, the casing 10 includes, in the height direction of the vertical pulverizer 1, a lower casing 19 that accommodates components from a lower end of the speed reducer 4 to a lower end of the separator 30, and a lower end of the separator 30. And an upper casing 20 that covers the upper part of the vertical mill 1.

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

  As shown in FIGS. 1 and 2, the upper casing 20 is provided inside the vicinity of the boundary between the upper case 21 and the lower case 22 so as to extend slightly inside and above the end of the rotating rotor 31 of the separator 30. And a sealing plate 41 formed to extend slightly downward from the short path preventing plate 40 toward the side of the rotating rotor 31. The short-path preventing plate 40 and the seal plate 41 prevent the gas flow swirling in the circumferential direction of the separator 30 from flowing into the product outlet 29 as a shortcut without passing through the separator 30.

  The lower case 22 is formed in, for example, a truncated cone shape that can accommodate the separator 30 inside. In addition, the lower case 22 can take various shapes such as a polygonal truncated pyramid shape and an elliptical truncated cone shape. As shown in FIG. 3, the center of the lower case 22 coincides with, for example, the rotation center axis P2 of the rotating rotor 31 of the separator 30 and the center P1 of the upper case 21.

  The upper case 21 is formed in a truncated cone shape that covers the lower case 22, and has a duct portion 21b reaching a product outlet 29 protruding upward or on a side surface. The upper case 21 is provided with one product outlet 29. For example, a rectifying plate (not shown) may be attached inside the duct portion 21b reaching the product outlet 29 of the upper case 21. The upper case 21 can take various shapes other than the truncated cone shape.

  As shown in FIGS. 1 and 2, pressure sensors provided, for example, in pairs in the up and down direction on the inner wall surface of the lower case 22 at positions corresponding to the vicinity of the upper end and the lower end of the separator 30 in the horizontal direction, respectively. 48 and a pressure sensor 49 are arranged. Further, these pressure sensors 48 and 49 are arranged at a plurality of positions along the circumferential direction of the rotating rotor 31 of the separator 30, for example.

  As shown in FIG. 3, these pressure sensors 48 and 49 are provided at a plurality of locations (e.g., at equal intervals) on the inner wall surface of the lower case 22 except for a region below the duct portion 21 b having the product outlet 29 in the upper case 21. , 7 locations). Each of the pressure sensors 48 and 49 detects the pressure of the gas flow in the machine flowing through the installation location, and outputs detection information to the angle adjustment unit 47.

  The angle adjuster 47 calculates differential pressures near the upper end and the lower end of the separator 30 at a plurality of positions as each pressure loss dp based on the detection information from each of the pressure sensors 48 and 49. In FIG. 3, the angle adjusting unit 47 calculates the pressure losses dp1 to dp7 at a plurality of locations in the clockwise direction in the circumferential direction from the duct unit 21b, for example.

  At the same time, the angle controller 47 calculates a deviation CD of the plurality of pressure losses dp1 to dp7 in the circumferential direction of the separator 30. That is, since the pressure losses dp1 to dp7 are affected by the flow rate of the gas flow flowing into the separator 30 and the fine powder concentration, the deviation CD of these pressure losses dp1 to dp7 is monitored to indirectly monitor the drift. Is possible.

  In this way, the angle adjusting unit 47 drives each angle adjusting motor 61 to move the link mechanism 62 such that the deviation CD indicated by the calculation result falls within the range CTV of the preset predetermined value (control target value). Controls the tilt angle adjusting mechanism to adjust the tilt angles α of the plurality of blades 51 at desired locations connected to the link mechanism 62.

  Thus, the area of the openings 54 between the blades 51 at the plurality of locations can be appropriately increased or decreased, and the flow rate of the gas blown up from the blade ring 50 can be adjusted at the plurality of locations in the machine. Therefore, the drift of the gas flow flowing in the machine in the circumferential direction of the separator 30 can be reduced, and the bias of the theoretical classification point d described later can be suppressed to improve the quality of the product.

  The optimum value of the inclination angle α of the blade 51 varies depending on various conditions such as a raw material to be pulverized by the vertical pulverizer 1 and a dust accumulation amount in the pulverizer. In this regard, according to the above configuration, the deviation CD of the pressure loss dp at a plurality of points in the gas flow around the separator 30 is monitored, and the inclination of the blade 51 is adjusted so that the deviation CD falls within the control target value range CTV. Since the angle α can be found and adjusted, efficient pulverization can be performed while always balancing the improvement of product quality and suppression of power consumption. Further, even if various conditions change during the operation of the vertical mill 1 and the situation of the deviation CD changes, the optimum inclination angle α of the blade 51 can be found and dealt with, so that the product by efficient milling can be obtained. Quality can be continuously improved.

  On the other hand, the rotary table 5 shown in a partial cross section in FIG. 1 is provided with a circular central area and an annular roller rolling area around the central area. Above the central area of the turntable 5, a cylindrical chute 6 is provided extending vertically from the upper part of the vertical crusher 1 toward the center of the turntable 5. A new raw material (such as a cement clinker) is supplied to the chute 6 from above.

  On the outer peripheral side of the chute 6, a funnel-shaped cone 7 for supplying an internal circulating raw material (granules) is introduced. The lower ends of the chute 6 and the cone 7 are arranged, for example, so as to form the same plane. Therefore, the new raw material and the internal circulating raw material are stably fed and supplied onto the central area of the turntable 5 through the chute 6 and the cone 7. Each raw material supplied on the central area of the turntable 5 is guided while rotating spirally to the roller rolling area by the rotational force of the turntable 5.

  Further, the vertical crusher 1 includes, for example, a plurality of crushing rollers 8 that can roll on the roller rolling region of the rotating table 5 according to the rotation of the rotating table 5 and a plurality of auxiliary rollers (not shown). I have. The crushing roller 8 is disposed, for example, at a position that bisects the roller rolling region, and the auxiliary roller is disposed between the crushing rollers 8 and at a position that bisects the roller rolling region.

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

  An auxiliary roller (not shown) is swingably supported by the same configuration. The pulverizing roller 8 is mainly used for finely pulverizing the raw material, and the auxiliary roller is mainly used for deaeration from the raw material layer. Each raw material that is supplied on the central area of the rotary table 5 and supplied to the roller rolling area, and then passes between the rotary table 5 and the grinding roller 8 and the auxiliary roller in the roller rolling area, It is blocked by a dam ring 12 provided around the outer periphery. The dam ring 12 is arranged so that its height can be adjusted, for example.

  A gas introduction duct 14 for introducing gas into the blade ring 50 from a gas introduction fan (not shown) provided outside is provided on a lower side of the lower casing 19. Further, below the gas introduction duct 14 of the lower casing 19, there is provided a lower extraction duct 15 for extracting the raw material that has not fallen sufficiently into the blade ring 50 and falls out of the machine.

  In the lower case 22 of the upper casing 20, a separator 30 is arranged in a region inside the cone 7 surrounding the chute 6. The separator 30 is rotated by a rotating rotor 31 having rotating blades, for example, clockwise as viewed in a plan view from above, together with a rotating cylinder 3b rotated by a rotor motor 3 via a drive belt 3a. The raw material (pulverized material) pulverized by the pulverizing roller 8 or the like is classified into a product (fine powder) having a predetermined particle size. A fixed blade 32 is provided at a position corresponding to the rotating rotor 31 of the separator 30 above the cone 7.

  Then, from the product outlet 29 provided in the upper case 21 of the upper casing 20, a sufficiently 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 formed as a product. Taken out. The vertical pulverizer 1 configured as above operates, for example, as follows.

  First, a new raw material is supplied from the chute 6 onto the central area of the turntable 5 while the turntable 5 is rotated. The supplied new raw material receives centrifugal force in the table radial direction due to the rotation of the rotary table 5 and moves while sliding on the rotary table 5 in the outer peripheral direction. During the movement, the raw material receives a force in the rotating direction by the turntable 5 and slides with the turntable 5 to rotate at a speed somewhat lower than the rotation speed of the turntable 5.

  As described above, the force obtained by combining the two forces in the radial direction and the rotation direction of the rotary table 5 acts on the raw material, so that the raw material rolls on the rotary table 5 from the central region while drawing a spiral trajectory. Guided to the area. The raw material thus guided to the roller rolling region enters between the crushing roller 8 and the auxiliary roller and the rotary table 5 from a direction forming an angle with the roller axis direction. Thus, it is bitten, degassed and pulverized, and is blocked by the dam ring 12.

  On the other hand, gas such as air or hot air from the gas introduction duct 14 blows up into the lower casing 19 through the openings 54 between the blades 51 of the blade ring 50. Among the raw materials (granules) that have passed over the dam ring 12 after the pulverization, the raw materials that are scattered during the pulverization and float inside the machine, or the internal circulation raw materials (granules) that do not have a particularly large particle diameter, The gas is blown up while swirling on the swirling flow of gas.

  The raw material thus blown up rises in the lower casing 19 accompanying the gas, and is subjected to a classifying action by the fixed blades 32 and the rotary rotor 31 of the separator 30 located in the upper casing 20. As a result, particles having a predetermined particle size (fine powder) are discharged as a product from the product outlet 29 together with the gas. At the same time, the coarse particles are dropped again on the rotary table 5 through the cone 7 as an internal circulating raw material, and pulverized.

  Further, among the raw materials that have passed over the dam ring 12, for example, those having an extremely large particle diameter or extremely heavy including metals, etc., fall from the blade ring 50 below the vertical crusher 1, and It is taken out of the take-out duct 15 to the outside. The taken-out raw material is returned to the chute 6 again from a transport line (not shown) as necessary, and is pulverized by the vertical pulverizer 1 by external circulation.

  The angle control unit 47 of the vertical crusher 1 performs the inclination angle adjustment processing of the blade 51 of the blade ring 50 during such operation. FIG. 8 is a flowchart showing blade inclination angle adjustment processing of the vertical mill. FIG. 9 is a distribution diagram of the pressure loss calculated in the blade inclination angle adjustment processing of the vertical crusher.

  As shown in FIG. 8, during operation of the vertical crusher 1, the angle control unit 47 first detects the gas flow flowing in the machine in the circumferential direction of the separator 30 based on the detection information from the pressure sensors 48 and 49. The pressure loss dp (pressure loss dp1 to dp7) at a plurality of locations is calculated (step S100).

  Next, the deviation CD in the circumferential direction of each calculated pressure loss dp is monitored (step S102). In this monitoring process, the angle control unit 47 obtains the maximum value and the minimum value of the pressure loss dp, and specifies their detection points. Then, the angle control unit 47 determines whether or not the deviation CD is within a preset control target value range CTV (step S104).

  When it is determined that the deviation CD is within the control target value range CTV (Yes in step S104), the deviation of the gas flow in the circumferential direction of the separator 30 is small, and the deviation CD is within the control target value range CTV in the circumferential direction. Since it is considered that the theoretical classification points d are distributed, the process proceeds to step S100 and the subsequent processes are repeated.

  If it is determined that the deviation CD is not within the range CTV of the control target value (No in step S104), the range of the control target value in the circumferential direction of the separator 30 or the location where the maximum value and the minimum value of the pressure loss dp are detected. A tilt angle adjustment mechanism or the like disposed at a position that affects the gas flow outside the CTV is specified. Then, the angle adjusting motor 61 of the tilt angle adjusting mechanism at the specified position is driven to move the link mechanism 62 to tune and change the plurality of blades 51 and adjust the tilt angle α (step S106).

  In this step S106, the inclination angle α of the blade 51 is varied within the range of about 35 ° to 80 ° with respect to the table upper surface (horizontal plane) of the rotary table 5, for example. That is, the angle formed by the plate surface of the blade 51 with respect to the upper surface (horizontal plane) of the turntable 5 is the inclination angle α, and the inclination angle α is adjusted to be variable within the above-mentioned angle range. For example, assuming that the flow velocity and the flow rate of the gas introduced from the gas introduction duct 14 are constant, the area of the opening 54 is reduced if the inclination angle α is reduced. The momentum increases. Conversely, if the inclination angle α of the blade 51 is increased, the area of the opening 54 is increased, so that the force of the gas blown up from the blade ring 50 so as to swirl is reduced.

  As shown in FIG. 9, the angle control unit 47 specifically distributes the deviation CD based on the measurement result of each of the pressure losses dp1 to dp7 calculated in step S100 in the circumferential direction as shown. In this case, for example, the inclination angle α of the blade 51 is set so that the deviation CD falls within the control target value range CTV including the ideal classification Id in which the theoretical classification point d is uniform in the height direction and the circumferential direction of the separator 30. Variable.

  In addition, if the inclination angle α of the blade 51 is reduced to increase the swirling flow of the gas flowing inside the machine, the theoretical classification point d in the circumferential direction of the separator 30 can be adjusted in a direction to make it uniform. As α decreases, the pressure loss of the gas for forming the swirling flow increases, and the required power (power consumption) increases.

  Therefore, for example, when the deviation CD exceeds the control target value range CTV, the angle control unit 47 increases the inclination angle α of the blade 51 by the inclination angle adjustment mechanism at a position that influences the deviation CD to reduce the gas flow. Weaken. When the deviation CD is less than the control target value range CTV, the inclination angle α of the blade 51 is reduced by the inclination angle adjusting mechanism at a position affecting the control target value to increase the gas flow.

  The vertical crusher 1 according to the first embodiment performs such angle control of the inclination angle α of the blade 51 individually and simultaneously for each inclination angle adjustment mechanism at a plurality of positions in the circumferential direction of the blade ring 50. be able to. As a result, it is possible to perform classification while maintaining an optimum balance so as to make the theoretical classification point d uniform in the circumferential direction while suppressing an increase in power consumption of the vertical mill 1 as much as possible.

  That is, the inclination state (inclination angle α) of the blades 51 of the blade ring 50, which is proportional to the flow rate of the gas passing through the openings 54 between the blades 51, can be kept to the minimum necessary. The power consumption of the gas introduction fan and the separator 30 can be reduced while reducing the pressure loss. Therefore, it is possible to simultaneously improve the quality of the product and save energy of the equipment of the vertical mill 1.

[Example of First Embodiment]
The present applicant has conducted intensive studies in an attempt to balance improvement of classification efficiency and suppression of increase in power consumption in the vertical pulverizer 1 operating as described above. Obtained knowledge. First, an essential simulation fluid analysis was performed on the classification point of the separator 30. Thereby, it turned out that the deviation of the theoretical classification point d in the circumferential direction of the separator 30 becomes remarkable. Hereinafter, using Example 1 of the vertical pulverizer 1 of the first embodiment and Comparative Example 1 of a conventional vertical pulverizer, the fluid analysis results of both will be compared and described.

  FIG. 10 is a distribution diagram of theoretical classification points of Comparative Example 1 and Example 1 in the circumferential direction when the cross section taken along line AA of FIG. 2 is viewed from above in plan view. Although not shown, the vertical pulverizer of Comparative Example 1 is configured such that only the annular passage is disposed from the vertical pulverizer 1 of Example 1 except for the blade ring 50 and the inclination angle adjustment mechanism, and gas is blown up. The configuration is as follows.

First, the theoretical classification point d of the separator 30 is obtained by calculating the equation of motion of the particles of the granular material in the direction toward the center between the rotating blades of the rotating rotor 31 (central speed) vg and the direction of rotation of the rotating rotor 31. By rearranging by speed (turning speed) vθ, it can be expressed as the following equation 1.
d∝vg ^0.5 / vθ (Equation 1)
d: theoretical classification point (μm)
vθ: turning speed (m / s)
vg: center speed (m / s)

  Note that the center direction speed vg depends on the amount of airflow that is going to pass through the rotating blades of the rotating rotor 31, and the turning direction speed vθ depends on the rotating speed of the rotating rotor 31. For this reason, the theoretical classification point d (that is, product grain size) can be easily operated by controlling the number of rotations of the rotating rotor 31 under the condition where the passing air flow rate is constant.

  If the theoretical classification point d is uniform in the height direction and the circumferential direction of the separator 30, the theoretical classification point d becomes the ideal classification Id. However, while a substantially uniform turning speed field (vθ = constant) is formed by the rotation of the rotary rotor 31, the center speed vg is not uniform in the circumferential direction. , A deviation (deviation) of the center speed vg occurs.

  Such a drift is mainly caused by the relationship between the arrangement of the duct portion 21b to the product outlet 29 and the rotation direction of the rotating rotor 31 of the separator 30, the gas introduction duct 14 in the lower casing 19, the blade It is caused by factors such as the arrangement of the ring 50 or each blade 51.

  Note that, like the vertical pulverizer of Comparative Example 1 and the vertical pulverizer 1 of Example 1, the duct portion 21b up to the product outlet 29 has a general shape and arrangement, and the center P1 of the upper case 21 In the configuration in which the rotation center axis P2 of the rotary rotor 31 of the separator 30 coincides with the airflow, an air flow wrap around as shown by an arrow F1 and a short path flow as shown by an arrow F2 in FIGS. 2 and 3 respectively occur. . These changes in the swirling state of the gas flow, such as the air flow wrap and the short path flow, also cause the bias of the theoretical classification point d in the circumferential direction.

  As shown in FIG. 10, the vertical pulverizer of Comparative Example 1 in which the blade ring 50 and the like are not installed and no countermeasures are taken against a change in the swirling state of the gas flow is, for example, a line A-A in FIG. 2. The deviation of the distribution of the theoretical theoretical classification points d in the actual circumferential direction is remarkable with respect to the ideal classification Id which is the average value of the theoretical theoretical classification points d of the separator 30 in the cross section.

  On the other hand, the vertical crusher 1 according to the first embodiment including the pressure sensors 48 and 49, the angle control unit 47, the blade ring 50, and the tilt angle adjusting mechanism as described above has a swirling state of a gas flow which is a factor causing drift. Can be flexibly responded to by finely controlling the strength of the gas flow to the change of the distribution of the theoretical classification points d in the actual circumferential direction in the cross section along the line AA. And the distribution is closer to the ideal classification Id.

  As in Comparative Example 1, the deviation of the theoretical classification point d in the circumferential direction increases the particle size width of the particle size distribution of the product. As a result, the particle size distribution of the product has a wider particle size configuration than originally desired, and there is a concern that the quality may be adversely affected. In addition, since the theoretical classification point d is biased, the performance of the pulverizer decreases.

  That is, the fine powder that should be taken out as a product is returned to the inside as coarse powder in the region of the upper casing 20 where the theoretical classification point d is large. As a result, unnecessary energy consumption associated with the operation of the vertical crusher is caused, so that not only a reduction in the crushing amount but also an increase in the power consumption unit is caused.

  Further, when the amount of the granular material returned on the turntable 5 increases due to the deviation of the theoretical classification point d, the material layer on the turntable 5 increases and vibration is induced. In order to make the vibrations converge, the operation must be stopped from the viewpoint of protection of the equipment, resulting in a large damage to the operation.

  On the other hand, as in the vertical crusher 1 of the first embodiment, the angle control of the inclination angle α of the blade 51 of the blade ring 50 is performed for each inclination angle adjustment mechanism at a plurality of positions in the circumferential direction of the blade ring 50. In a configuration in which the calculation is performed individually and simultaneously, as shown in FIG. 10, the overall distribution of the theoretical classification points d in the circumferential direction is less unbalanced than in Comparative Example 1. Therefore, according to the vertical pulverizer 1 of Example 1, the adjustment of the particle size of the product becomes more reliable and easier.

  As described above, in the vertical pulverizer 1 according to the first embodiment, the deviation of the theoretical classification point d in the circumferential direction of the separator 30 is set, for example, so as to be within the range CTV of the control target value approximate to the ideal classification Id. Can be smaller. 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.

  In addition, since the amount of powder returned to the inside of the vertical pulverizer 1 can be reduced, the power consumption can be improved while increasing the pulverization amount, and the occurrence of vibration can be reduced. . Furthermore, the effect of increasing the efficiency by strengthening the swirling of the gas flow flowing in the machine to make the theoretical classification point d uniform in the circumferential direction, and the inefficiency by increasing the power consumption for driving the gas introduction fan are reduced. Regarding the conflicting effects, highly accurate classification can be performed while keeping an optimum balance so as to make the theoretical classification point d uniform in the circumferential direction while suppressing an increase in power consumption as much as possible.

[Modification of First Embodiment]
FIG. 11 is an explanatory diagram showing the overall configuration of a modification of the vertical crusher according to the first embodiment of the present invention. In FIG. 11, the same components as those in the above-described first embodiment (FIGS. 1 to 10) are denoted by the same reference numerals, and redundant description will be omitted below.

  As shown in FIG. 11, a vertical pulverizer 1 </ b> A according to a modification of the first embodiment has a configuration in which a tilt angle adjusting mechanism for adjusting the tilt angle α of each blade 51 of the blade ring 50 includes a plurality of angle adjusting motors. This is different from the tilt angle adjustment mechanism of the vertical pulverizer 1 of the first embodiment having the link mechanism 61 and the link mechanism 62.

  That is, the tilt angle adjusting mechanism of the vertical crusher 1A of the modified example includes one angle adjusting motor 61A and a gear link mechanism 67 connected to all the blades 51 of the blade ring 50. The gear link mechanism 67 is disposed, for example, in an annular shape on the outer peripheral side of the blade ring 50, and rotates an adjustment ring 68 connected to each blade 51 by a drive gear 69a and a support gear 69b directly connected to a rod of an angle adjustment motor 61A. It is composed of

  By rotating the adjustment ring 68 in this manner, the inclination angles α of all the blades 51 of the blade ring 50 are uniformly changed. Therefore, the angle control of the inclination angle α of the blade 51 cannot be performed individually and simultaneously at a plurality of positions in the circumferential direction of the blade ring 50 as described above.

  However, also in this modification, the inclination angle α of the blade 51 of the blade ring 50 is varied by the angle control unit 47 based on the detection information from the sensors 48 and 49 to adjust the strength of the swirling gas flow. Can be. As a result, it is possible to classify while maintaining an optimal balance so as to make the theoretical classification point d uniform in the circumferential direction while suppressing an increase in power consumption of the vertical mill 1A as much as possible. The same operation and effect as the vertical pulverizer 1 of the first embodiment can be obtained.

[Second embodiment]
FIG. 12 is an explanatory diagram showing the entire configuration of a vertical pulverizer according to the second embodiment of the present invention. FIG. 13 is a partially enlarged view of the vertical crusher. FIG. 14 is an explanatory diagram showing a state in which a partial horizontal cross section of the vertical crusher of FIG. 13 is viewed from above in a plan view. In the second embodiment (FIGS. 12 to 14), the same components as those in the above-described first embodiment (FIGS. 1 to 11) are denoted by the same reference numerals, and will be duplicated below. Description is omitted.

  As shown in FIGS. 12 to 14, the vertical crusher 1 </ b> B according to the second embodiment includes pressure sensors 48 and 49, an angle control unit 47, a blade ring 50, a tilt angle adjustment mechanism, and the like. This is the same as the vertical pulverizer 1 according to the first embodiment, but differs in the structure of the upper casing 20 as described below.

  That is, the upper casing 20 includes the lower case 22 and the upper case 21, and the center of the lower case 22 coincides with, for example, the rotation center axis P <b> 2 of the rotating rotor 31 of the separator 30. However, the upper case 21 has, for example, an eccentric frustoconical base 21a and a duct 21b extending to the product outlet 29 protruding above or on the side of the base 21a. It is to be noted that the upper case 21 is provided with one product outlet 29 as in the first embodiment.

  The eccentric truncated cone in the base 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 top surface of the truncated cone are shifted in the height direction. The shape of the base 21a of the upper case 21 is not limited to such an eccentric frustoconical shape, but may take various shapes.

  As shown in FIG. 14, the upper casing 20 is formed such that the center P1 of the upper case 21 is eccentrically arranged from the rotation center axis P2 of the rotating rotor 31 of the separator 30, and is connected to the lower casing 19. . Specifically, the upper case 21 is configured such that the upper casing 20 has the product outlet 29 disposed on the left side and is viewed from above in a plan view, and for example, the rotation center axis of the separator 30 having the rotating rotor 31 that rotates clockwise. In the orthogonal coordinate system with P2 as the origin, the center P1 of the upper case 21 (the center point of the base 21a) is located in the fourth quadrant, and the center point P3 of the product outlet 29 of the duct 21b is located in the third quadrant. Eccentrically arranged.

  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, such an eccentric arrangement has the center of the lower case 22 (that is, the rotation center axis P2), The center point P1 of the base 21a of the upper case 21 is eccentric.

Note that, specifically, the upper case 21 has a 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, for example, where D is the outer diameter of the rotating rotor 31 of the separator 30 (see FIG. 13). The dimension SH in the vertical direction (see FIG. 13), the dimension in the X direction from the origin (the rotation center axis P2) of the center point P1 of the base 21a in the above-described rectangular coordinate system is SX, and the dimension in the Y direction is SY (see FIG. 14). ) 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]

  Since the center P1 of the upper case 21 is eccentrically arranged from the rotation center axis P2 of the rotating rotor 31 of the separator 30, the angle control of the inclination angle α of the blade 51 of the blade ring 50 can be controlled by the circle of the blade ring 50. In addition to the configuration in which the inclination angle adjustment mechanisms are individually and simultaneously performed at a plurality of positions in the circumferential direction, it is possible to more effectively suppress the deviation of the theoretical classification point d of the separator 30 in the circumferential direction.

  Thus, as in the first embodiment, the power consumption of the vertical mill 1B can be improved, the amount of pulverization can be increased, and the quality of the fine powder product can be improved while reducing vibration. In addition, with respect to the conflicting effects described above, highly accurate classification is performed while maintaining an optimum balance so as to uniformize the theoretical classification point d in the circumferential direction while suppressing an increase in power consumption as much as possible. Can be.

[Example of Second Embodiment]
The present applicant again performed the essential simulation fluid analysis on the classification point of the separator 30 in the vertical mill 1B of the second embodiment that operates in the same manner as the vertical mill 1 of the first embodiment. . Hereinafter, a description will be given by using Example 2 of the vertical crusher 1B of the second embodiment and Comparative Example 2 of the conventional vertical crusher 1 and comparing the fluid analysis results of the two.

  Although the vertical crusher of Comparative Example 2 is not shown, the vertical crusher of Example 1 of the first embodiment is similar to the vertical crusher of Comparative Example 1 in the first embodiment. The arrangement is such that only the annular passage is disposed except for the blade ring 50 and the inclination angle adjusting mechanism from 1 to blow up gas. Therefore, in Comparative Example 2, the cross section taken along line DD and the cross section taken along line EE in FIG. 2 and FIG. 3 will be referred to.

  FIG. 15 is a distribution diagram of theoretical classification points of Comparative Example 2 and Example 2 in the circumferential direction when the cross sections taken along line DD of FIGS. 2 and 13 are viewed from above in plan view. FIG. 16 is a distribution diagram of the theoretical classification points of Comparative Example 2 and Example 2 in the circumferential direction when the cross sections taken along line EE of FIGS. 2 and 13 are viewed from above in plan view. That is, FIGS. 15 and 16 show distribution maps of theoretical classification points of the DD line section and the EE line section in the vertical pulverizer 1B of Example 2 and the vertical pulverizer of Comparative Example 2. . A cross section taken along the line DD shows a horizontal cross section near the lower end of the separator 30, and a cross section taken along the line EE shows a horizontal cross section near the upper end of the separator 30.

  First, Comparative Example 2 will be described. In the vertical pulverizer of Comparative Example 2, both the lower case 22 and the upper case 21 of the upper casing 20 are formed into conical truncated cones. Therefore, the center P1 of the upper case 21 and the rotation center axis P2 of the rotating rotor 31 of the separator 30 as shown in FIG. Note that the rotating rotor 31 of the separator 30 rotates clockwise as described above.

  The theoretical classification point d of the separator 30 can be expressed by the above equation 1, and the point at which the theoretical classification point d deviates from the ideal classification Id and the gas flow circling inside the machine are indicated by arrows F1 and FIG. The point that the air flow wraparound and the short path flow indicated by F2 occur in both Comparative Example 2 and Example 2 are as described above.

  Due to the influence of the air flow wraparound indicated by the arrow F1, in the section taken along the line DD near the lower end of the separator 30 of Comparative Example 2, when the product outlet 29 is viewed from the front, the theoretical classification point d is on the left side of the upper casing 20. It tends to be larger. That is, as shown by the dotted line in FIG. 15, the theoretical classification point d of Comparative Example 2 is very large in a region where the influence of the air flow wraparound is remarkable. This is because the gas flow wraps around with the rotation of the rotating rotor 31 that rotates clockwise, and the speed vg in the center direction increases in the left region when the product outlet 29 is viewed from the front.

  On the other hand, due to the effect of the short path flow indicated by the arrow F2, in the cross section taken along the line EE near the upper end of the separator 30 of Comparative Example 2, when the product outlet 29 is viewed from the front, the product outlet of the upper casing 20 On the 29th side, the theoretical classification point d tends to increase. That is, as shown by the dotted line in FIG. 16, the theoretical classification point d of Comparative Example 2 is very large in a region where the influence of the short path flow is remarkable. This is because the 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.

  Therefore, in Comparative Example 2, since the theoretical classification point d is largely biased in the circumferential direction, the particle size distribution of the particle size distribution of the product is increased and the particle size is widened. It is unavoidable that malfunctions such as causing an increase in power consumption and power consumption and causing vibrations are likely to occur.

  On the other hand, as in the vertical mill 1B of the second embodiment, the center P1 of the upper case 21 and the rotation center axis P2 of the rotating rotor 31 of the separator 30 are eccentrically arranged. In the configuration in which the inclination angle α of the blade 51 is varied, as shown in FIGS. 15 and 16, in the region where the influence of the air flow wraparound is significant and the region where the influence of the short path flow is significant, respectively, the comparative example 2 It has been found that the theoretical classification point d is very small as compared with. Further, it was also found that the overall distribution of the theoretical classification points d in the circumferential direction of the separator 30 was less unbalanced as compared with Comparative Example 2.

  Therefore, according to the vertical pulverizer 1B of the second embodiment, it is possible to more reliably and easily adjust the particle size of the product. That is, the vertical pulverizer 1B of the second embodiment has a configuration in which the eccentric arrangement of the upper case 21 and the control of the gas flow by the blade ring 50 are performed. And the effect of the short path flow near the upper end can be reduced as much as possible. Thereby, the same operation and effect as the first embodiment can be obtained.

  Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This new embodiment can be implemented in other various 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 spirit of the invention, and are also included in the invention described in the claims and the equivalents thereof.

1, 1A, 1B Vertical grinder 2 Rotary table motor 3 Rotor motor 3a Drive belt 3b Rotary cylinder 4 Reducer 5 Rotary table 6 Chute 7 Cone 8 Crush roller 10 Casing 12 Dam ring 14 Gas introduction duct 15 Lower take-out duct 18 Controller 19 Lower Casing 19a Lower Casing Frame 20 Upper Casing 21 Upper Case 21a Base 21b Duct 22 Lower Case 29 Product Outlet 30 Separator 31 Rotor Rotor 32 Fixed Blade 47 Angle Controller 48,49 Pressure Sensor 50 Blade Ring 51 Blade 52 inner ring part 53 outer ring part 54 opening 61 angle adjusting motor 62 link mechanism 63, 68 adjusting ring 64, 64a horizontal arm 65, 65a vertical arm 66 main rod 67 gear link mechanism

Claims (9)

A raw material supplied on a rotary table with a plurality of rotating crush rollers is crushed between the rotary table and the crush roller, and the crushed raw material is provided above the rotary table by a gas flow. Vertical crusher to take out from the product outlet,
A blade ring in which a plurality of blades are annularly arranged along the outer periphery of the rotary table,
An inclination angle adjustment mechanism that varies the inclination angle of the blade of the blade ring,
A separator having a rotating part while classifying the raw material blown up by the gas flow introduced into the machine through the blade ring,
An upper casing for housing the separator in the machine,
Pressures which are arranged along the circumferential direction of the rotating part of the separator, and are arranged at a plurality of locations on the upper casing so as to correspond to the vicinity of the upper end and the vicinity of the lower end of the separator in the horizontal direction, respectively, and to form a pair in the vertical direction. Sensors and
Based on the detection information from each of the pressure sensors, the differential pressure near the upper end and near the lower end of the separator is calculated as each pressure loss, and the deviation of the plurality of pressure losses in the circumferential direction of the separator is determined by the gas flow flowing through the machine. An angle control unit that calculates the deviation of the pressure loss in the circumferential direction of the separator, and controls the inclination angle adjustment mechanism to adjust the inclination angle of the blade so that the deviation indicated by the calculation result is within a predetermined value range. A vertical crusher comprising: The tilt angle adjustment mechanism,
A link mechanism for connecting a predetermined number of blades of the plurality of blades so that the inclination angle is simultaneously variable,
The vertical crusher according to claim 1, further comprising: a motor that drives the link mechanism. The angle controller,
The vertical crusher according to claim 1, wherein an inclination angle of the blade is variably adjusted within a range of 35 ° to 80 ° with respect to a table upper surface of the rotary table. The upper casing,
An upper case that covers the upper part of the separator and has the product outlet, and the upper case is configured to rotate the upper casing clockwise when the product outlet is disposed on the left side and viewed in a plan view from above. In the Cartesian coordinate system where the rotation center axis of the separator having the portion is the origin, the separator is such that the center point of the upper case is located in the fourth quadrant and the center point of the product outlet is located in the third quadrant. The vertical crusher according to any one of claims 1 to 3, wherein the crusher is formed so as to be eccentrically arranged from the rotation center axis. The upper case has a truncated cone-shaped base, and a duct that extends to the product outlet protruding above or on a side of the base,
The vertical crusher according to claim 4, wherein a center of the base is eccentrically arranged from a rotation center axis of the separator. The upper casing includes a frustum-shaped lower case that covers the sides of the separator,
The vertical crusher according to claim 4, wherein a center of the lower case is coincident with a rotation center axis of the separator. The upper case,
The vertical crusher according to any one of claims 4 to 6, further comprising one product outlet. The upper case,
D is the outer diameter of the rotating part of the separator, SH is the dimension in the height direction of the base, SX is the dimension in the X direction from the origin of the center point of the base in the rectangular coordinate system, and SY is the dimension in the Y direction. , The dimensions of the 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 crusher is formed so as to satisfy the following conditions. A raw material supplied on a rotary table with a plurality of rotating crush rollers is crushed between the rotary table and the crush roller, and the crushed raw material is provided above the rotary table by a gas flow. Operating method of a vertical pulverizer taken out from the product outlet,
A raw material is blown up by a gas flow introduced into the machine through a plurality of blades whose tilt angles are variable by a tilt angle adjusting mechanism and arranged in a ring along the outer periphery of the rotary table, and the rotating material has a rotating unit. When classifying with a separator and taking out from the product outlet,
Around the upper portion and the lower portion of the separator, which are arranged along the circumferential direction of the rotating part of the separator and accommodate the separator in the machine, in the horizontal direction and near the upper end and the lower end of the separator, and are paired in the vertical direction. Based on the detection information from the pressure sensor arranged as described above, the differential pressure near the upper end and near the lower end of the separator is calculated as each pressure loss, and the deviation of the plurality of pressure losses in the circumferential direction of the separator is determined in the machine. Calculated as the deviation of pressure loss in the circumferential direction of the separator of the flowing gas flow,
A method for operating a vertical pulverizer, wherein the inclination angle of the blade is adjusted by controlling the inclination angle adjusting mechanism so that the deviation indicated by the calculation result falls within a predetermined value range.

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