JP4301605B2 - Vertical roller crusher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vertical roller pulverizer for pulverizing agglomerates such as cement raw materials, cement clinker, and coal for fuel.
[0002]
[Prior art]
FIG. 7 shows a sectional view of a rotary table used in a conventional vertical roller pulverizer.
[0003]
As shown in the figure, the rotary table 12 is driven to rotate in a horizontal plane by a driving device, and a plurality of crushing rollers 9 are arranged on the rotary table 12. Each crushing roller 9 is pressed against the crushing portion 12A on the upper surface of the rotary table 12 and is rotated by friction as the rotary table 12 rotates, and the raw material supplied onto the rotary table 12 from the upper chute. It is the structure which grind | pulverizes the granular lump.
[0004]
Further, FIG. 7 experimentally measures the accumulation state (layer thickness H) of the object to be crushed on the rotary table 12 and the state where coarse particles / coarse powder after pulverization accumulates in the dam ring 12B, and the result is also shown. It is shown.
[0005]
[Problems to be solved by the invention]
In such a conventional vertical roller pulverizer, since the layer thickness H of the object to be crushed on the rotary table 12 is large as shown in FIG. There was a problem of becoming. Further, since an excessive pushing force is applied to the pulverizing roller 9, there is a problem that the pulverizing roller 9 is heavily worn and the pulverizing roller 9 has a short life.
[0006]
An object of the present invention is to reduce the thickness of a pulverized material layer on a rotary table of a vertical roller pulverizer, to reduce excessive pushing power of the pulverizing roller, and to reduce wear of the pulverizing roller.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a rotary table that rotates in a horizontal plane, a plurality of crushing rollers that are provided with a concave crushing portion formed on an upper surface of the rotating table, and that are disposed in engagement with the crushing portion, A vertical roller crusher comprising a supply chute for supplying a product onto a rotary table and a ring-shaped dam ring attached to the outer periphery of the rotary table, wherein the shape of the crushing part on the upper surface of the rotary table is It is formed by increasing the height of the center side from the outer peripheral side of the rotary table, crushing section shape of the rotating table top surface, and the radius of the grinding surface of the grinding rollers and R _2, the center side of the radius R ₁ and, the radius of the outer periphery side when the _{R 3,} have a relationship of R _{1 <R} 2 _{<R 3,} furthermore, the center point of the radius _{R 1} is the radius _{R 2} line, the radius _{R 2} and _{R 3} The center point is on the center line of the grinding surface of the grinding roller. And it forms the curve connecting consecutively a radius R _{1 ·} R 2 · R ₃ of al. According to a second aspect of the present invention, a horizontal shelf is provided at the central portion of the rotary table and the inclined portion up to the pulverization start point. According to a third aspect of the present invention, an inclined portion having a lower inner side and a higher outer side is formed on the upper surface of the dam ring.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a vertical roller pulverizer according to the present invention will be described in detail with reference to FIGS. 1 to 6.
FIG. 1 is a conceptual diagram of a vertical roller pulverizer as an example of a pulverizer for agglomerates.
As shown in the figure, the rotary table 2 is rotationally driven in a horizontal plane by the driving device 1, and a plurality of pulverizing rollers 9 supported by a roller shaft 10 are arranged on the rotary table 2. Each crushing roller 9 is pressed against a crushing portion on the upper surface of the rotary table 2 and is rotated by friction as the rotary table 2 rotates, and the raw material particles supplied from the chute 4 onto the rotary table 2 are rotated. The lump is crushed.
[0009]
Further, as shown in FIG. 3, the shape of the pulverized portion on the upper surface of the rotary table 2 is formed such that the height on the central side is higher than the outer peripheral side of the rotary table, and the central portion 2a of the rotary table 2 and the pulverization start point. A horizontal shelf 2c is provided on the inclined portion 2b up to 2d. As shown in FIG. 6, which shows a partial plane of the rotary table 2, the shelf 2 c is provided on the entire circumference of the rotary table 2, as with the inclined portion 2 b, the pulverizing portion 2 e, and the dam ring 3. Note that the shelf 2c may be provided so as to be inclined in a direction slightly lowering toward the pulverization unit.
[0010]
Next, in FIG. 1, hot hot gas is supplied from the hot gas inlet 5 and blown upward from the slot 11 on the outer periphery of the rotary table 2, and the crushed coarse particles / coarse powder are conveyed upward, while remaining The agglomerates fall from the slots 11 and are taken out from the discharge chute 8 for the spilled spilled material. On the other hand, among the coarse particles / coarse powder conveyed upward by the hot gas, the coarse particles are directly returned onto the rotary table 2, and the coarse powder is conveyed from the drying chamber 3 to the classifier 7 by the rising gas flow, and classified. The later coarse particles are returned to the rotary table 2 again, and the coarse particles and the coarse powder are pulverized again. And the fine powder after classification is taken out from the top gas discharge port 6 together with the hot gas.
[0011]
The overflow pulverized material taken out from the discharge chute 8 is conveyed upward by a transport machine (not shown), and is circulated again into the machine via the chute 4 and crushed.
FIG. 4 is a plan view showing the arrangement of the crushing rollers 9 and shows a state in which three crushing rollers 9 are evenly arranged on the rotary table 2. However, the number of crushing rollers 9 is limited to three. What is necessary is just to select arbitrarily by grinding | pulverization conditions. FIG. 5 illustrates the flow of the pulverized material that is bitten into the roller pressure lower portions 21 of the pulverizing rollers 9 when the pulverized material is supplied onto the rotary table 2.
[0012]
In this embodiment, in particular, the shape of the pulverized portion of the conventional rotary table is improved. The height of the central side is made higher than the outer peripheral side of the rotary table 2, and an inclined portion that easily overflows from the dam ring 3 is provided. It is configured in a shape.
[0013]
Crushing section shape of the rotary table 2, as shown in FIG. 2, the radius of the grinding surface of the grinding roller 9 When R _2, the radius of the central side R _1, the radius of the outer periphery side when the R ₃ , R ₁ <R ₂ <R ₃ , and the center point of the radius R ₁ is on the radius R ₂ line, and the center points of the radius R ₂ and the radius R ₃ are on the center line of the grinding roller 9 grinding surface. In addition, the pulverized portion is formed by a curve obtained by continuously connecting these radii R ₁ , R _2, and R ₃ .
[0014]
According to the pulverization unit configured as described above, the height on the center side is higher than that of the conventional pulverization unit, and the central gap between the pulverization roller 9 and the rotary table 2 is reduced.
[0015]
A dam ring 3 that suppresses the overflow of coarse particles and coarse powder after pulverization is fixed to the outer peripheral portion of the rotary table 2, and the upper surface of the dam ring 3 has an inclined portion 3 a that is low on the inside and high on the outside. Is formed.
[0016]
According to the vertical roller pulverizer configured as described above, when an object to be pulverized is supplied onto the rotary table 2, the pulverized portions of the pulverizing rollers 9 and the rotary table 2 are engaged with each other. The agglomerates are crushed.
At this time, since the central side is higher than the outer peripheral side of the rotary table 2 and the shelf portion 2c is formed, the supplied pulverized material is directed from the central side of the rotary table 2 toward the outer peripheral side as shown in FIG. It moves smoothly, and its layer thickness h becomes thinner while leveling.
[0017]
When the crushing rollers 9 while biting the ground product with the rotation of the rotary table 2 rotates, grinding roller 9 by a layer thickness h of the crushing portion is low, be thrust through ground less power it can. In addition, since the pushing power is small, uneven wear of the grinding roller 9 can be reduced.
[0018]
Further, since the pulverizing portion is formed so that the gap between the pulverizing roller 9 and the central side of the rotary table 2 is reduced, the pulverization at the central side of the rotary table 2 increases, and the pulverization proceeds from the central side to the outer peripheral side. The crushing effect is improved.
[0019]
Furthermore, the coarse powder and coarse particles pulverized in the pulverizing part are pushed out from the outer peripheral side of the rotary table 2 and smoothly move through the lowered dam ring 3 and the inclined part 3a and overflow further outward. The layer thickness of the pulverized material on the outer peripheral side of the rotary table can be reduced, and the pulverized portion can be brought closer to the center of the rotary table 2.
[0020]
【The invention's effect】
The present invention relates to a rotary table that rotates in a horizontal plane, a plurality of pulverizing rollers that are provided with a concave pulverizing portion formed on the upper surface of the rotating table, and arranged to engage with the pulverizing portion, and an object to be crushed on the rotary table. A vertical roller crusher comprising a supply chute to be fed to and a ring-shaped damlin attached to the outer peripheral portion of the rotary table, wherein the shape of the pulverized portion on the upper surface of the rotary table is the outer peripheral side of the rotary table Since the height on the center side is made higher, the layer thickness of the pulverized product is reduced, the pushing power of the pulverizing roller can be greatly reduced, and the life of the pulverizing roller can be extended.
[0021]
Further , when the radius of the grinding surface of the grinding roller is R ₂ , the shape of the grinding part on the upper surface of the rotary table is R ₁ <R ₁ <when the center radius is R ₁ and the outer radius is R _3. R ₂ <R ₃ , and the center point of the radius R ₁ is on the radius R ₂ line, and the center points of the radii R ₂ and R ₃ are on the center line of the grinding surface of the grinding roller. By forming a curved line continuously connecting R ₁ , R _2, and R ₃ , the gap on the center side of the crushing roller and the rotary table becomes smaller, and crushing on the center side of the rotary table increases. Grinding progresses toward the outer periphery, and the grinding effect is improved.
[0022]
In addition, since a horizontal shelf is provided at the central part of the rotary table and the inclined part to the pulverization start point, a part of the pulverized material is collected on the shelf, and the entire amount of the pulverized material is supplied to the pulverization roller at once. Since the load on the grinding roller is averaged and an overload state is prevented, the life of the grinding roller can be further extended.
[0023]
In addition, since an inclined portion having a low inside and a high outside is formed on the upper surface of the dam ring, the pulverized material easily overflows from the outer peripheral portion of the rotary table, and the layer thickness on the outer peripheral side of the rotary table can be reduced.
[0024]
According to the test results of the vertical roller pulverizer according to the present invention, it is clear that the pulverization power is reduced by about 1/3 compared with the conventional one.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing an entire vertical roller crusher according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a cross-sectional shape of an upper surface of a turntable according to the present embodiment.
FIG. 3 is a cross-sectional view showing a pulverized state on the upper surface of the rotary table of the present embodiment.
FIG. 4 is a plan view showing the arrangement of crushing rollers of the present embodiment.
FIG. 5 is a plan view showing the flow of the pulverized material at the lower roller pressure of the pulverizing roller of the present embodiment.
FIG. 6 is a plan view showing a turntable of the present embodiment.
FIG. 7 is a cross-sectional view showing a pulverized state on the upper surface of a conventional rotary table.
[Explanation of symbols]
2 Rotary table 2a Central part 2b Inclined part 2c Shelf part 2d Grinding start point 3 Dam ring 3a Inclined part 4 Supply chute 9 Grinding roller

Claims (3)

A rotating table that rotates in a horizontal plane, a concave crushing portion is formed on the top surface of the rotating table, a plurality of crushing rollers arranged to engage with the crushing portion, and a supply for supplying an object to be crushed onto the rotating table A vertical roller crusher comprising a chute and a ring-shaped dam ring attached to the outer peripheral portion of the rotary table, wherein the shape of the pulverized portion on the upper surface of the rotary table is more central than the outer peripheral side of the rotary table is formed by increasing the height, crushing section shape of the rotating table top surface, and the radius of the grinding surface of the grinding rollers and R _2, the center side of the radius and R _1, the radius of the outer circumference side R ₃ R ₁ <R ₂ <R ₃ , the center point of the radius R ₁ is on the radius R ₂ line, and the center points of the radii R ₂ and R ₃ are on the grinding surface of the grinding roller. is on the center line, these radii _R 1 · _{R 2} · Vertical roller mills you characterized by being formed by a curve connecting ₃ the continuously. Vertical roller grinding machine of claim 1 Symbol placement and providing a horizontal-like ledge on the inclined portion to the center portion and the grinding start point of the rotary table. Wherein the upper surface of the dam ring, vertical roller mills of claim 1 Symbol mounting, characterized in that the inner forming an outer high slope portion lower.

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