JPH04346846A - Vertical crusher - Google Patents

Abstract

PURPOSE:To improve classification efficiency and the quality of the product by providing plural vertical flat blades for preventing the intrusion of a coarse grain at the top of a rotary separator in the circumferential direction and extending a cylindrical shielding plate downward around the blades from a casing. CONSTITUTION:A rotary separator 13 is provided at the upper part of a classification chamber, and plural vertical flat blades 13h for preventing the intrusion of a coarse grain are furnished at the top of the separator 13 in the circumferential direction. Cylindrical shielding plates 1d and 1c are extended downward from a casing 1b around the blades 13h. Consequently, the unclassified gas does not flow in, the intrusion of a coarse grain is prevented, the classified grain size distribution is sharpened, classification efficiency is increased, and the quality of the product is improved.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention separates materials to be crushed, such as cement raw materials, clinker, blast furnace slag, and chemicals, into fine powder and coarse powder by entraining them in an air flow in the crushing section of a vertical crusher. The present invention relates to a vertical crusher equipped with a rotary separator.

0002

[Prior Art] As a type of pulverizer that finely grinds raw materials such as limestone, blast furnace slag, and cement raw materials into powder,
As shown in FIG. 6, a vertical crusher 1 equipped with a rotary table and crushing rollers is widely used. This type of crusher has a motor 2A installed at the bottom of a cylindrical casing 1a.
A disc-shaped rotary table 3A is driven by a reducer 2 to rotate at a low speed, and a plurality of crushing rollers 4 are press-contacted with hydraulic pressure or the like at positions that equally divide the outer circumference of the upper surface in the circumferential direction and rotate as a result. We are prepared.

The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 5 and an arm 7 which are pivotally supported by a shaft 6 on the casing 1a, and when the hydraulic cylinder 9 is actuated, the crushing roller 4 is , the crushing roller 4 is pressed onto the rotary table 3A to apply crushing pressure to the raw material. 3B is a dam ring provided on the outer peripheral edge of the rotary table 3A to adjust the material layer thickness, 14 is an annular space passage around the rotary table 3A for blowing up gas, 15 is a hot air blowing passage, and 13 is a raw material pulverized by the blade 13A. 16 is an outlet for taking out the product together with the gas, and 17 is a raw material input chute.

[0004] In such a vertical crusher, the raw material supplied to the center of the rotary table 3A through the raw material input chute 17 is subjected to centrifugal force in the radial direction of the table due to the rotation of the rotary table 3A, and flows over the rotary table 3A. When it slides, it receives a rotational force from the rotary table 3A, slides between it and the rotary table 3A, and rotates somewhat slower than the rotation speed of the rotary table 3A. The above two forces, that is, the forces in the radial direction and the force in the rotational direction are combined, and the raw material moves to the outer circumference of the rotary table 3A while drawing a spiral trajectory on the rotary table 3A. A roller is pressed against this outer periphery and rotates, so the raw material drawn in the spiral line is transferred to the crushing roller 4.
The particles enter between the roller and the rotary table 3A from a direction forming a certain angle with the axial direction of the roller, and are bitten and crushed.

On the other hand, air or gas such as hot air is guided through a duct to the base of the casing 1a.
As this gas blows up from the annular space passage 14 between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing, the crushed fine powder is carried along with the gas and moved into the casing 1.
a, and is subjected to a classification action by the classification blades 13a of the rotary separator 13 located at the top, and products with a predetermined particle size are discharged from the discharge port 16 together with the gas and sent to the next process.

On the other hand, the classification blade 1 of the rotary separator 13
3a are arranged concentrically around the rotating shaft 13b at equal intervals, for example, 30 to 50 pieces, and have an inclination angle θ that is vertical or increases in diameter from the bottom to the top, and when viewed from above. The classification vanes are each radially mounted. The classification blade 13a in the embodiment shown in FIG. 6 is made of scalene angle steel.

Classification is achieved by balancing the centrifugal force acting on the particles in the dust-containing gas and the drag force of the air flowing inward when the swirling airflow containing the fine powder crushed in the crushing section flows into the classification blade 13a. The fine particles smaller than the particle size at the classification point pass through the classification blade 13a and are taken out of the system via the discharge port 16, while the coarse particles are rejected by the classification blade 13a and cannot pass through the classification blade 13a. Then it falls back into the crushing section.

[0008]

[Problems to be Solved by the Invention] In the rotary separator in the prior art as described above, coarse particles that are not subjected to the classification action pass through the gap between the top of the separator's classification blade and the separator casing, and the classified particle size of the product is reduced. Coarse distribution,
In addition, there was a problem in that the product quality deteriorated due to the looseness.

[0009]

[Means for Solving the Problems] In order to solve the above problems, the vertical crusher of the present invention has a vertical drive shaft that is rotatably supported at the center of the classification chamber, and a vertical drive shaft that rotates integrally around the vertical drive shaft. A vertical crusher is equipped with a rotary separator consisting of a large number of flat classification blades, and the raw material is crushed by a rotary table located below the classification chamber and a crushing roller that is pressed onto the rotary table and rotates as a result of the rotation. , a plurality of vertical flat plate-like coarse-grain anti-flying blades are arranged around the circumference on the top of the classification blade, and a cylindrical shielding plate is attached to the inner or outer peripheral side of the anti-flying blade from the casing of the separator. It has a structure in which it hangs down.

0010

[Operation] In the vertical crusher of the present invention, a flying prevention blade is provided at the top of the classification blade of the separator, and a shielding plate is hung down, so that dust-containing gas passes through the gap between the top of the separator and the separator casing. It is difficult for the particles to pass through due to the centrifugal force caused by the rotation of the anti-flying plate, so there are fewer coarse particles that bypass and mix into the product. Therefore, good classification can be achieved with less variation in the classified particles.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings. 1 to 5 relate to embodiments of the present invention, FIG. 1 is a longitudinal cross-sectional view of a separator, and FIG. 2 is a line II-I in FIG.
3 is a partially developed plan view showing another embodiment of the diving prevention blade, FIG. 3(a) shows a receding linear blade, and FIG. 3(b) shows a receding curved blade. FIG. 4 is an enlarged vertical cross-sectional view of a main part showing another embodiment of the shielding plate part, and FIG. 5 is an enlarged longitudinal cross-sectional view of a main part showing another embodiment of the shielding plate part.

In the figure, the separator 13 includes a classification blade 13a disposed around a rotating shaft 13b that rotates perpendicularly to the central axis of the vertical crusher 1, and a classification blade 13a and the rotating shaft 1.
3b, an upper support 13d and a lower cone 13e, and a donut plate 13c that divides the upper and lower end donut plates 13c, 13c and the classification blade 13a into three stages,
13c. Further, below the separator 13, an inverted conical guide cone 13f is fixed to the casing 1b via a support 13g.

On the other hand, the top of the separator 13, that is,
As shown in FIG. 2, on the upper surface of the topmost donut plate 13c, a plurality of diving prevention blades 13h are arranged vertically and radially at equal intervals around the circumference. Cylindrical shielding plates 1c (outer side) and 1d (inner side) are vertically suspended from the casing 1b of the separator 13 in close proximity to the inner and outer peripheries of the anti-flying blade 13h so as to cover the side surfaces thereof. . The shielding plates 1c, 1d and the diving prevention blade 13h are not in contact with each other. The gap is made as small as possible, and is usually 5 to 10 mm. Further, the gap between the upper end of the fly-in prevention blade 13h and the lower surface of the casing 1b of the separator 13 is set to 5 to 10 mm, and the jump-in prevention blade 13h is surrounded by small gaps on three sides.

FIG. 4 shows another embodiment, in which a disc 13i protrudes further outward from the top donut plate 13c, and a vertical shielding plate 1c is attached to the casing 1b on the outer diameter side. It is made by joining donut plates 1e, and is configured so that a smaller gap between the upper surface of the disk 13i and the donut plate 1e compared to the one in FIG. 1 makes it more difficult for dust-containing gas to pass through the bypass.

As another embodiment, as shown in FIG. 5, the top donut plate 13c is horizontally protruded outward, and a conical extending plate 13j is formed by connecting a conical portion inclined diagonally downward. Established. On the other hand, from the casing 1b, a resistance plate 1f, in which two conical cones were connected in parallel with a small gap, was fixedly attached along the upper surface of the conical portion of the conical extending plate 13j. The shielding plate 1f may be made of bent angle iron.

As described above, the structure of the shielding plate shown in FIGS. 1, 4, and 5 all includes a path leading to the jump prevention blade 13h and a path passing around the jump prevention blade 13h into the inside of the separator 13. The synergistic effect of providing resistance to the path of the dust-containing gas to make it difficult for the dust-containing gas to flow and preventing the intrusion of gas by the fan effect caused by the rotation of the anti-flying blade 13h reduces the amount of coarse particles contained in the dust-containing gas. This prevents contamination inside the grains.

[0017]

[Effects of the Invention] As explained above, the vertical crusher of the present invention is provided with a coarse particle jumping prevention blade at the top of the classification blade of the separator, and a bypass for dust-containing gas between the jumping prevention blade and the casing. A shielding plate is installed to narrow the passage through which unclassified gas flows, preventing coarse particles from entering, resulting in a sharp classified particle size distribution.
Good classification efficiency can be obtained, resulting in improved product quality.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a separator of a vertical crusher of the present invention.

FIG. 2 is a plan view taken along line II-II in FIG. 1 according to the present invention.

FIG. 3 is a partially developed plan view showing another embodiment of the diving prevention blade according to the present invention.

FIG. 4 is an enlarged vertical cross-sectional view of a main part showing another embodiment of the shielding plate section according to the present invention.

FIG. 5 is an enlarged vertical cross-sectional view of a main part showing another embodiment of the shielding plate section according to the present invention.

FIG. 6 is an overall vertical sectional view showing an example of a conventional vertical crusher.

[Explanation of symbols]

1 Vertical crusher 1a Mill casing 1b Separator casing 1c Shielding plate (outside) 1d Shielding plate (inside) 1e Donut board 1f Resistance plate 3A Rotary table 4 Grinding roller 13 Separator 13a Classifying blade 13b Rotation axis 13c Donut board 13d Support 13e Conical cone 13f Guide cone 13h Diving prevention feather 13i Overhanging disk 13j Conical overhang plate

Claims (1)

[Claims] Claim 1: A rotary separator comprising a vertical drive shaft rotatably supported at the center of the classification chamber and a number of flat classification blades that rotate integrally around the vertical drive shaft, and a rotary separator is provided at the bottom of the classification chamber. In a vertical crusher that crushes raw materials using a rotary table and a crushing roller that is pressed on the rotary table and rotates as a result of the rotation, a plurality of vertical flat plate-like coarse grain prevention blades are installed around the top of the classification blade. 1. A vertical crusher characterized in that a cylindrical shielding plate is provided on the inner circumferential side or outer circumferential side of the separator casing, and a cylindrical shielding plate is suspended from the casing of the separator.