JP5906782B2 - Vertical crusher - Google Patents

Description

  The present invention relates to a vertical pulverizer for finely pulverizing raw materials such as blast furnace slag, electric furnace slag and cement clinker.

  As a device for crushing raw materials such as slag and clinker, a vertical crusher (sometimes called a vertical mill or a vertical roller mill) is widely used. The vertical crusher can efficiently pulverize the raw material, but has a problem that abnormal vibration occurs due to various factors such as properties of the raw material and pulverization conditions. Conventionally, various measures have been taken to prevent such abnormal vibration.

  For example, a vertical crusher disclosed in Patent Document 1 below is known. This vertical crusher is configured such that a rotatable crushing roller and an auxiliary roller are arranged on a rotary table, and the size of the center diameter of the auxiliary roller is larger than the size of the center diameter of the crushing roller. As a result, the raw material layer (grinding layer) on the rotary table containing a large amount of air is caught in a wide part of the auxiliary roller and gently compressed while degassing, thereby suppressing abnormal vibration and efficiently producing the raw material. Can be pulverized.

JP 2010-234219 A

  The present invention provides a vertical crusher that can further improve the above-described prior art and can adjust the raw material layer thickness to be constant and can efficiently pulverize the raw material while suppressing abnormal vibration. With the goal.

  The vertical crusher according to the present invention is a cylindrical chute that supplies new raw materials, a funnel-shaped cone that is disposed on the outer peripheral side of the chute and supplies internal circulation raw materials, and new raw materials are supplied from the chute. And a rotating table that guides each raw material from the central region to the roller rolling region by rotating, and a central region to which the internal circulation raw material is supplied from the cone and a roller rolling region around the central region. A crushing roller and an auxiliary roller that follow the rotation of the rotary table in a state of being pressed against the roller rolling area and roll on the roller rolling area, and are provided on the outer peripheral edge of the rotary table, And a dam ring that dams up the raw materials that have passed between the rollers, and the dam ring that is disposed on the inner side of the roller rolling region. And a scraper for making the layer thickness of each raw material guided to the roller rolling region constant, and both ends of the scraper are attached and fixed to the lower end of the cone via a support shaft. And

  According to the vertical crusher according to the present invention, the scraper is attached and fixed to the lower end portion of the cone on the central region via the support shaft so as to be positioned inside the roller rolling region. The material layer can be made constant by preventing deposition and adhesion of the material, and the clogging of the chute can be prevented and the material can be efficiently guided to the grinding roller and the auxiliary roller. Further, the frictional force acting on the scraper and the rotary table caused by the raw material layer can be reduced, and noise and vibration generated in the vertical crusher can be reduced or prevented. Further, since the thickness of the raw material layer can be made constant even on the roller rolling region by the auxiliary roller, the pulverization efficiency can be improved.

In one embodiment of the present invention, the chute is a chute that extends in the vertical direction from the top of the vertical crusher toward the center of the rotary table.
Further, the distance H1 from the lower end surface of the chute to the upper surface of the rotary table is such that H1 = D × (0.1 to 0.2) [mm] where D is the diameter of the rotary table. Is set.

  In another embodiment of the present invention, the height H2 of the scraper is such that H2 = D × (0.015−0.02) [mm] where D is the diameter of the rotary table. The distance H3 from the upper surface of the rotary table to the upper surface of the scraper is set to be H2 + h [mm] where h is the height between the rotary table and the scraper.

In still another embodiment of the present invention, the load applied to the crushing roller is set to be 9 to 12 kg / cm ² per projected area of the crushing roller, and the load applied to the auxiliary roller is It is set to be ² to 5 kg / cm ² per projected area of the auxiliary roller.

  In still another embodiment of the present invention, the dam ring is configured to be height adjustable.

  According to the present invention, the raw material layer thickness can be adjusted to be constant, and abnormal raw material can be suppressed and the raw material can be pulverized efficiently.

It is a figure showing the whole vertical crusher composition concerning one embodiment of the present invention. It is sectional drawing of a part of vertical crusher shown in FIG. FIG. 2 is an enlarged view of a part of the vertical crusher shown in FIG. 1. It is a figure which shows the correlation of a rotary table speed and a dynamic friction coefficient. It is a figure which shows the correlation with an auxiliary roller contact pressure and an apparent friction coefficient.

  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 a diagram showing an overall configuration of a vertical crusher according to an embodiment of the present invention, and a part thereof is shown in cross section. FIG. 2 is a sectional view of a part of the vertical crusher, and FIG. 3 is an enlarged view of a part of the vertical crusher. As shown in FIGS. 1 to 3, the vertical crusher 1 is disposed on the motor 3, the speed reducer 5 that reduces and transmits the rotational force from the motor 3, and the speed reducer 5. The rotary table 7 is rotationally driven by the motor 3 via the speed reducer 5, and a casing 9 that houses these components other than the motor 3.

  The rotary table 7 is shown in partial cross section in FIG. 1 and partially in cross section in FIG. Here, the rotary table 7 includes a circular central region 11 and an annular roller rolling region 13 around the central region 11. On the central region 11, an elongated scraper 15 that is longer than the diameter of the chute 19 to be described later and is almost the same as the diameter of the cone 18 is disposed along the diameter of the rotary table 7. Both ends of the scraper 15 are attached and fixed to the lower end of the cone 18 via, for example, a support shaft 17.

  Further, the vertical crusher 1 is disposed above the central region 11 of the rotary table 7 for supplying new raw materials, and extends in the vertical direction from the upper part of the vertical grinder 1 toward the center of the rotary table. The chute 19 and a funnel-shaped internal circulation raw material supply cone 18 disposed on the outer peripheral side of the chute 19 are provided. The lower ends of the chute 19 and the cone 18 are arranged so as to constitute the same surface. Therefore, the new raw material and the internal circulation raw material are stably fed and supplied onto the central region 11 of the turntable 7 through the chute 19 and the cone 18. Each raw material supplied onto the central region 11 is guided to the roller rolling region 13 by a rotational force, and at that time, is brought into contact with the scraper 15 and stirred (stirred) so as to have a constant layer thickness.

  In addition, as a form of the chute 19 for supplying the raw material to the center of the rotary table 7, a chute 19 (so-called so-called) that extends in the vertical direction from the upper part of the vertical crusher 1 toward the center of the rotary table 7 as in the above-described embodiment. ) And a chute (so-called side chute) that extends inward from the side surface of the vertical crusher 1 and goes to the center of the rotary table 7.

Here, since the type called the side chute described above does not require a chute to be arranged on the top of the vertical crusher 1, the size of the bearing of the separator 35 can be reduced, and as a result, the apparatus can be manufactured at low cost. There are benefits.
However, in order to form a chute from the side surface side of the vertical crusher 1 toward the center of the rotary table 7, it is usually necessary to bend or incline the chute in the machine.
In this case, the raw material moves while sliding in the chute. However, the raw material can be smoothly moved onto the rotary table 7 by a combination of a friction coefficient between the raw materials and a friction coefficient with a slide (chute). The problem of not being able to occur.
In other words, when a side chute is used as a raw material supply means, there is a possibility that the raw material flowing through the chute may adhere to the chute, particularly when the chute has a bent portion or adherence. In the case of supplying a high raw material to the turntable 7, the problem is remarkable.

  In the case of supplying the raw material on the rotary table after bending the chute in the machine and changing the flow of the raw material, or supplying the raw material on the rotary table from the inclined chute, in the vicinity of the chute outlet, Due to the influence of the inertial force of the raw material, the flow of the raw material is biased. As a result, the raw material may flow out of the chute outlet in a biased direction, and the raw material is uniformly supplied to the center of the rotary table 7. A problem that cannot be done arises.

  On the other hand, in the present embodiment, the raw material is introduced from the upper part of the vertical crusher 1 and is dropped straightly toward the center of the rotary table 7 using the chute 19 extending in the vertical direction. Since it is not necessary to slide the raw material in 19 and there is no need to bend the chute 19 inside the pulverizer, there is a problem that the raw material adheres to the chute described in the explanation of the side chute type, or the raw material rotates from the chute. There is no problem of jumping out and flowing in a biased direction on the table, which is a particularly preferable form.

  Further, the vertical crusher 1 includes two crushing rollers 21 that can roll on the roller rolling area 13 of the rotary table 7 as the rotary table 7 rotates, and two auxiliary rollers 22. The crushing roller 21 is arranged at a position that bisects the roller rolling area 13, and the auxiliary roller 22 is arranged between the crushing rollers 21 and at a position that bisects the roller rolling area 13.

  The crushing roller 21 is connected to a piston rod 29 of a hydraulic cylinder 27 via arms 23 and 25 attached to the casing 9 so as to be swingable by a shaft. By operating this hydraulic cylinder 27, the crushing roller 21 is pressed against the roller rolling region 13 to give a crushing force to the raw material layer. The auxiliary roller 22 is also supported in a swingable manner with the same configuration. The crushing roller 21 mainly pulverizes the raw material, and the auxiliary roller 22 is mainly used for degassing the raw material layer.

  Then, after being supplied onto the central region 11 and having a constant layer thickness by the scraper 15, each raw material is supplied to the roller rolling region 13 and passes between the rotary table 7 and the rollers 21 and 22 in this region 13. Is dammed by a dam ring 47 provided on the outer peripheral edge of the rotary table 7. The dam ring 47 is arranged such that its height can be adjusted.

  The rotary table 7 and the casing 9 form an annular space passage 31 serving as a gas blow-up portion. A duct 33 for supplying gas from the outside to the annular space passage 31 is disposed at the lower part of the casing 9. A rotating separator 35 is disposed inside the cone 18 so as to surround the chute 19 in the upper part of the casing 9. The rotary separator 35 classifies the raw material crushed by the blades 37. Further, a fixed blade 37 a is provided at a position corresponding to the blade 37 of the rotary separator 35 above the cone 18. In the upper part of the casing 9, a discharge port 39 for taking out the raw material pulverized with the gas as a product is formed.

  In the rotary table 7, for example, a lightening portion 41 for reducing the weight of the rotary table 7 is formed in the central region 11. The flattened portion 41 has a circular plane, and an iron disc 43 is fitted at the upper end. Below the disc 43, a rib (not shown) for reinforcing the rotary table 7 is attached.

  In the vertical crusher 1 configured as described above, a gap 59 is formed between the scraper 15 and the rotary table 7 in a state where the scraper 15 is attached to the cone 18 via the support shaft 17. The height h of the gap 59 is the thickness of the raw material layer. The height h of the gap 59 is set to 50 mm, for example.

  The distance H1 from the lower end surface of the chute 19 (or cone 18) to the upper surface of the turntable 7 is H1 = D × (0.1 to 0.2) [mm, where D is the diameter of the turntable 7. ] Is set. Further, the height H2 of the scraper 15 is set to be H2 = D × (0.015−0.02) [mm] where D is the diameter of the rotary table 7. Accordingly, the distance H3 from the upper surface of the scraper 15 to the upper surface of the turntable 7 is H3 = H2 + h [mm]. The height H4 of the dam ring 47 is variable in order to determine the thickness of the raw material layer together with the gap 59.

  In this way, the scraper 15 is fixedly attached to the lower end portion of the cone 18 on the central region 11 with a height h of the gap 59, so that the scraper 15 is fixed without being in contact with the rotary table 7 and following the rotation. The Therefore, it is possible to effectively prevent the raw material from being piled on the central region 11 of the turntable 7 and to block the chute 19 with the raw material, and to homogenize the flow of the raw material and the raw material layer.

  The vertical crusher 1 operates as follows. First, a new raw material is supplied from the chute 19 onto the central region 11 of the turntable 7 while the turntable 7 is rotated. As new raw materials, wet slag, clinker and the like having a large particle size are conceivable. The new raw material supplied on the central region 11 receives a centrifugal force in the radial direction of the table by the rotation of the rotary table 7 and moves while sliding on the rotary table 7 in the outer peripheral direction. At that time, the raw material receives a force in the rotational direction by the rotary table 7, slides between the rotary tables 7, and rotates somewhat slower than the rotational speed of the rotary table 7.

  Accordingly, the raw material supplied to the central region 11 is applied with a force obtained by combining two forces in the radial direction and the rotational direction of the rotary table 7, so that the raw material draws a spiral trajectory on the rotary table 7. Thus, the roller is guided from the central region 11 to the roller rolling region 13. At this time, the rotary table 7 rotates under the scraper 15 through a gap 59 provided between the rotary table 7 and the scraper 15 in a state in which the rotation is prevented, so that the layer thickness of the raw material supplied onto the central region 11 is increased. Is made constant.

  By making the layer thickness constant, it is possible to prevent deposition of the raw material on the central region 11 and improve, for example, maintainability. That is, the physical property value of the raw material constantly changes during operation of the vertical crusher 1. In particular, when the particle size distribution or moisture that affects the fluidity of the raw material changes, the raw material supplied to the rotary table 7 stays on the central region 11 and the layer thickness changes. For this reason, since the rate of raw material biting into the pulverizing roller 21 and the auxiliary roller 22 varies, the differential pressure of the vertical pulverizer 1 becomes unstable, and the raw material supply amount must be adjusted. Will be reduced.

  Therefore, by providing the scraper 15 as in the vertical crusher 1 according to the present embodiment, it is effective to make the raw material layer on the turntable 7 uniform and make the layer thickness constant. In addition, when the fluidity | liquidity of a raw material is bad, when a driving | operation of the vertical crusher 1 is stopped, since a raw material remains accumulate | stored on the center area | region 11 of the turntable 7, the maintenance property deteriorates remarkably. However, the scraper 15 can also prevent such a problem.

  The raw material guided by drawing a spiral from the central region 11 of the turntable 7 to the roller rolling region 13 with a constant layer thickness is blocked by a dam ring 47. On the roller rolling area 13, the pulverizing roller 21 and the auxiliary roller 22 pressed against this area 13 roll following the rotation of the rotary table 7. The raw material enters between the pulverizing roller 21 and auxiliary roller 22 and the rotary table 7 from a direction that forms an angle with the roller axis direction, and is bitten, degassed and pulverized.

  Gases such as air and hot air from the duct 33 blow up into the casing 9 from the annular space passage 31. The raw material that has passed over the dam ring 47 after pulverization, the raw material that scatters during pulverization and floats inside the machine, or the internal circulated raw material that is not particularly large in particle size, is blown upward in the gas stream. ing.

  The raw material blown upward is entrained by the gas and ascends in the casing 9 and is classified by the blades 37 of the rotary separator 35 located at the upper part. Discharged. At the same time, the coarse powder falls again on the rotary table 7 via the cone 18 as an internal circulation raw material, and is pulverized. The predetermined particle size of the product is preferably, for example, an average particle size (= Dp50) of about 5 to 20 μm, and more preferably 15 μm or less.

  Among the raw materials that have passed over the dam ring 47, those that are extremely large in particle diameter, or that are extremely heavy including metals, etc., fall from the annular space passage 31 to the lower side of the vertical crusher 1, and are subjected to vertical pulverization. It is taken out from the lower part of the machine 1. The taken out raw material is returned to the chute 19 again by a conveyance line (not shown) as necessary, and is pulverized by the vertical pulverizer 1 by external circulation.

  The crushing roller 21 has a larger diameter than the auxiliary roller 22 in this embodiment. Since the auxiliary roller 22 is not a roller for pulverizing the raw material, the pressure applied to the rotary table 7 may be smaller than that of the pulverizing roller 21. The roller surface pressure S (Mpa) that presses each roller 21, 22 against the rotary table 7 is a diameter RD at the center in the thickness direction of the roller, a width W of the roller, and a force pressing the roller against the rotary table 7 in the vertical direction. When a certain pressing force is F, if the inclination angle between the center line in the width direction of the roller and the vertical axis is θ, it is expressed as S = (F × cos θ) / (W × RD).

Specifically, the load (roller surface pressure S) applied to the crushing roller 21 is 9 to 12 kg / cm ² (0.882 to 1.176 Mpa) per projected area of the crushing roller 21. The applied load (roller surface pressure S) is 2 to 5 kg / cm ² (0.196 to 0.49 Mpa) per projected area of the auxiliary roller 22. By setting the roller surface pressure S in this way, pulverization can be performed with optimum pulverization efficiency.

  The applicant obtained the following knowledge as a result of intensive studies to try to essentially suppress mill vibration. First, an essential analysis of mill vibration was performed. At this time, as a result of searching for the starting point at which the mill vibration occurs, it was determined that the cause is an instantaneous slip phenomenon of the crushing roller 21, and the diffusive vibration is continuously generated starting from the slip phenomenon. It was found to occur. It has also been found that the cause of the instantaneous slip phenomenon is a decrease in the friction coefficient.

  In the vertical crusher 1, when trying to obtain a fine product having an average particle size (= Dp50) of 15 μm or less, the specific surface area of the particles increases, so that there is more medium called gas in the raw material layer, As the coefficient of friction is further reduced, the mill is more likely to vibrate as finer products are obtained.

  Furthermore, as a result of the experiments by the present applicant, the friction coefficient is determined by the following law, which is a theoretical theory: (a) the substance to be rubbed and its surface roughness; (b) proportional to the normal force and the size of the contact area (C) It is unrelated to the magnitude of the sliding speed, and the new knowledge which overturns (a)-(c) was acquired. In other words, the above-mentioned theory of (a) to (c) applies to a single substance and a size of a unit of mm or more. It turns out that there is a difference.

  Accordingly, the present applicant pays attention to large particles of mm or more of new raw materials to be newly added in the crushing section of the vertical crusher 1, and the internal circulating raw material circulated in the crusher 1 is a required product. Attention was paid to the fact that if the particle size is small, the particle size is in μm units, and not a single particle but a group of particles mixed with gas.

  As a result of conducting various experiments based on these points of interest, the correlation shown in FIG. 4 was obtained. FIG. 4 is a diagram showing the correlation between the speed of the rotary table of the vertical crusher 1 and the dynamic friction coefficient. The vertical axis shows the dynamic friction coefficient, and the horizontal axis shows the speed in percentage. As is clear from this figure, it has been found that the friction coefficient tends to decrease greatly as the particle diameter becomes finer.

  It has been clarified that this tendency is not substantially changed, although there are some differences depending on the types of raw materials handled by the vertical crusher 1. Therefore, the friction coefficient in the state where the medium such as gas and the raw material are together is referred to as an “apparent friction coefficient”. As shown in FIG. 4, as a result of the experiment, it has been found that the apparent friction coefficient reverses the conventional theory that (c) is independent of the magnitude of the sliding speed. That is, as shown in FIG. 4, it can be understood that the apparent friction coefficient greatly decreases as the speed increases.

  In the vertical pulverizer 1, since a medium called gas exists in the raw material layer, applying the above theories (a) to (c) ignoring the existence of the medium is the environment of the pulverizing part of the vertical pulverizer 1. Is difficult. Therefore, it has been found that in order to suppress the mill vibration of the vertical crusher 1, it is particularly important to keep or increase the apparent friction coefficient constant.

  Further, since the raw material layer contains a medium called gas, it was found that the degassing action of the raw material layer is very important, and how to extract the gas is the biggest issue. It is known that the coefficient of friction is proportional to the vertical force as in the established theory of (b) above, but this is for raw materials having a size of mm or more, and this is applied to the pulverizing section of the vertical pulverizer 1 When trying to apply in the environment of, it became clear that unreasonableness occurred.

  This is because in the vertical crusher 1, the raw material particles are mixed with the gas, so that even if the particles are crushed and destroyed, the particles are discharged from directly below the crushing roller 21. For this reason, there is no influence on the pulverization. Therefore, it is necessary to keep the particles of the raw material together with a medium such as gas directly under the crushing roller 21. In the vertical crusher 1 according to this embodiment, the dam ring 47 plays the role. Yes.

  That is, the dam ring 47 prevents the raw material layer in the roller rolling region 13 from overflowing from the rotary table 7, so that the apparent friction coefficient can be effectively increased. Further, since the auxiliary roller 22 operates with the roller surface pressure as described above, the apparent friction coefficient can be further increased.

  It has been found that if the roller surface pressure of the auxiliary roller 22 is excessively increased, the apparent friction coefficient is decreased as shown in FIG. 5 to easily generate mill vibration. FIG. 5 is a diagram showing the correlation between the contact pressure of the auxiliary roller 22 of the vertical crusher 1 and the apparent friction coefficient, the apparent friction coefficient on the vertical axis and the contact pressure on the horizontal axis in percentage. It is shown.

  When the roller surface pressure is increased too much, mill vibration is likely to occur, which is a tendency that is prominently observed in the conventional vertical grinder, and is similar to the situation in which a grinding load is applied to all of the plurality of grinding rollers 21. As a result, the mill vibration is induced. For these reasons, the vertical crusher 1 according to the present embodiment employs the following configuration in order to effectively suppress mill vibration and improve the grinding efficiency.

  That is, as described above, the pulverizing roller 21 and the auxiliary roller 22 were used as a set. Accordingly, the raw material layer on the rotary table 7 can be deaerated by the auxiliary rollers 22 having a small roller surface pressure and then pulverized by the pulverizing roller 21 having a large roller surface pressure. It became possible to increase the consolidation effect of the raw material layer and improve the grinding efficiency.

The auxiliary roller 22 may be pressed against the rotary table 7 only by its own weight. In this case, even a weak component such as a swing lever or a roller shaft can be used. There is an advantage that it can be manufactured.
However, since there is a case where sufficient surface pressure cannot be obtained only with the auxiliary roller 22 and deaeration is insufficient, in the present embodiment described above, a preferable surface pressure range for the auxiliary roller 22 is set as a preferable mode. Described.

  Further, the lower end of the chute 19 and the cone 18 are arranged close to the rotary table 7, the scraper 15 is attached and fixed to the cone 18, and the parameters of the distance and dimensions of each arrangement relation are set as described above. As a result, it is possible to eliminate the piles of the raw material deposited on the central region 11 of the turntable 7, make the layer thickness of the raw material layer uniform, and prevent the chute 19 from being blocked. Therefore, it became possible to improve the grinding efficiency. In addition, since the deaeration effect by the auxiliary roller 22 can be further enhanced by employing the chute 19, the cone 18 and the scraper 15, it is possible to further improve the grinding efficiency while suppressing vibration.

  A dam ring 47 whose height can be adjusted is disposed on the outer peripheral edge of the rotary table 7. Since the thickness of the raw material layer on the turntable 7 is also affected by the height of the dam ring 47, the height of the dam ring 47 can be further adjusted according to the parameters of the chute 19 and the scraper 15, etc. It becomes possible to improve grinding efficiency.

  The arrangement angle of the scraper 15 is an angle defined by, for example, a line connecting the center points of the two opposing crushing rollers 21 and a longitudinal line of the scraper 15, and is about 45 ° in FIG. Although set, it can be set to various angles. In addition, the pulverizing roller 21 and the auxiliary roller 22 each have two sets, and one set is arranged. However, depending on the ability of the vertical crusher 1, a plurality of sets may be arranged more than that. Good.

In particular, when designing a vertical crusher 1 having a large processing capacity, the overall size of the entire apparatus increases as the amount of processing increases, but the size of the crushing roller 21 increases as the size increases. Then, the raw material biting speed is greatly increased. As a result, as shown in FIG. 4, the apparent friction coefficient is reduced, and the grinding roller 21 is likely to slip.
In the present invention, the auxiliary roller 22 is used to compact or deaerate the raw material layer and pulverize it to increase the apparent coefficient of friction to prevent slipping and increase the processing capacity. It is suitable for increasing the size of the pulverizer 1.

DESCRIPTION OF SYMBOLS 1 Vertical crusher 3 Motor 5 Reduction gear 7 Rotary table 9 Casing 11 Central area 13 Roller rolling area 15 Scraper 17 Support shaft 18 Cone 19 Chute 21 Grinding roller 22 Auxiliary roller 23, 25 Arm 27 Hydraulic cylinder 29 Piston rod 31 Annular Space passage 33 Duct 35 Rotating separator 37 Blade 39 Discharge port 41 Meat removal part 43 Disk 47 Dam ring 59 Crevice

Claims (6)

A cylindrical chute for supplying new raw materials;
A funnel-shaped cone that is arranged on the outer peripheral side of the chute and supplies the internal circulation raw material;
A new raw material is supplied from the chute and an internal circulating raw material is supplied from the cone, and has a flat central region and a roller rolling region around the central region. By rotating, the central region is moved from the central region to the roller rolling region. A rotary table for guiding each of the raw materials;
A pulverizing roller and an auxiliary roller that follow the rotation of the rotary table in a state of being pressed against the roller rolling area and roll in the roller rolling area;
A dam ring that is provided on the outer peripheral edge of the rotary table and dams the raw materials that have passed between the rotary table and the rollers;
A scraper that is disposed on the central region so as to be located inside the roller rolling region and that makes the layer thickness of each raw material guided to the roller rolling region constant.
The scraper is disposed along the diameter of the rotary table so as to form a gap with the rotary table, and both end portions are attached and fixed to the lower end portion of the cone via a support shaft. A vertical crusher.   The vertical crusher according to claim 1, wherein the chute is a chute extending vertically from the upper part of the vertical crusher toward the center of the rotary table. The distance H1 from the lower end surface of the chute to the upper surface of the rotary table is, when the diameter of the rotary table is D,
H1 = D × (0.1-0.2) [mm]
The vertical crusher according to claim 1 or 2, wherein the vertical crusher is set to be. When the diameter of the rotary table is D, the height H2 of the scraper is
H2 = D × (0.015-0.02) [mm]
Is set to be
The distance H3 from the upper surface of the rotary table to the upper surface of the scraper is set to be H2 + h [mm] where h is the height between the rotary table and the scraper. The vertical crusher according to any one of claims 1 to 3. The load applied to the grinding roller is set to be 9 to 12 kg / cm ² per projected area of the grinding roller,
The vertical crushing according to any one of claims 1 to 4, wherein a load applied to the auxiliary roller is set to be ² to 5 kg / cm ² per projected area of the auxiliary roller. Machine. The said dam ring is comprised so that height adjustment is possible. The vertical crusher of any one of Claims 1-5 characterized by the above-mentioned.

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