JPH0564750A - Vertical grinder - Google Patents

Abstract

PURPOSE:To enhance grinding efficiency by setting the cross-sectional shape of the annular dam ring formed to the upper surface of the outer peripheral end of a turntable to an inclined surface expanding upwardly on the inner peripheral side thereof. CONSTITUTION:A plurality of freely rotatable grinding rollers 4 are arranged to the upper surface of the outer peripheral surface of a turntable 3A and predetermined grinding pressure is applied to the grinding rollers 4 to grind a raw material between the upper surface of the turntable 3A and the peripheral surfaces of the grinding rollers 4. At this time, the cross-sectional shape of the annular dam ring 3B arranged to the upper surface of the outer peripheral end of the turntable 3A is set to an inclined surface expanded in its diameter upwardly on the inner peripheral side thereof. By utilizing the gap corresponding to the depleted part thus generated, the grinding rollers are moved outwardly by the quantity of said gap, the grinding force of the grinding rollers is increased and grinding efficiency is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses limestone, slag, clinker, coal,
The present invention relates to a vertical crusher for crushing raw materials such as cement raw materials and chemicals.

[0002]

2. Description of the Related Art FIG. 5 is a kind of crusher for pulverizing raw materials such as limestone, slag, and cement raw material into fine powder.
As shown in (1), a vertical crusher 1 having a rotary table and a crushing roller is widely used. This kind of crusher
A disk-shaped rotary table 3A which is driven by a speed reducer 2 by a motor 2A to rotate at a low speed in a lower portion of the cylindrical casing 15, and is driven to rotate by hydraulically contacting a portion equally dividing the outer peripheral portion of the upper surface thereof in the circumferential direction. And a plurality of crushing rollers 4 for

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 15 by a shaft 6, and by operating the hydraulic cylinder 9, The crushing roller 4 is pressed against 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 for adjusting the raw material layer thickness, 14 is a gas blowing annular space passage around the rotary table 3A, 14A is a gas supply passage, and 13 is a raw material crushed by blades 13A. A rotary separator for classification, 16 is an outlet for taking out products together with gas, and 17 is a raw material charging chute (raw material supply pipe).

In such a vertical crusher, the raw material supplied to the central portion of the rotary table by the raw material feeding chute 17 receives the centrifugal force in the radial direction of the rotary table 3A and slides on the rotary table 3A. At times, the rotary table 3A receives a force in the rotation direction, and the rotary table 3A
It slides with A and performs a rotation somewhat slower than the rotation speed of the rotary table 3A. The above two forces, that is, the radial direction force and the rotational direction force are combined, and the raw material is the rotary table 3.
A spiral locus is drawn on A to move to the outer peripheral portion of the rotary table 3A. Since the roller is pressed against the outer periphery and is rotating, the raw material in which the spiral is drawn enters the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axial direction and is bitten. It is crushed and crushed.

On the other hand, at the base of the casing 15, gas such as air or hot air is introduced by a duct,
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, whereby the pulverized fine powder is entrained in the gas and the casing 1
5, the blade 1 of the separator 13 that is located in the upper part
The product having a predetermined particle size is subjected to the classification action by 3A and is discharged together with the gas from the discharge port 16 and sent to the next step.

[0006]

In the vertical type crusher as described above, the role of the dam ring is to keep the layer thickness of the raw material on the rotating rotary table at a certain constant value and to centrifuge the rotary table by centrifugal force. This is for holding the raw material that slides from the outer periphery to the outer periphery on the rotary table for a certain period of time to perform the pulverizing action performed between the pulverizing roller and the rotary table. By the way, of the inner peripheral surface which is the crushing surface of the crushing roller, the position where the crushing action is most performed is determined on the outer diameter side of the crushing roller, that is, the innermost circumference of the dam ring, judging from the degree of progress of wear in the past operation record. It is near the surface. Therefore, in order to increase the crushing efficiency, the crushing roller should be placed as close to the outer diameter side of the rotary table as possible, and the position immediately below the crushing roller where the crushing surface pressure is the largest and the crushing action is the largest, should be rotated as much as possible. It is to bring it to the outer diameter side of the table. However, in the conventional crushing roller and dam ring, for example, as shown in FIGS. 6 to 8, there are two closest points X closest to the dam ring 3B. Since the crushing surface pressure is smaller than that of the lowest point U, the crushing action is inferior. Therefore, it is necessary to improve the grinding efficiency by some means to bring the outermost side (outermost diameter end) of the grinding roller 4 between the two X to X as close to the outer diameter side of the rotary table as possible.

[0007]

In order to solve the above problems, in the vertical crusher of the present invention, a plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of the rotary table.
In a vertical crusher that applies a predetermined crushing pressure to a crushing roller to crush the raw material between the upper surface of the rotary table and the peripheral surface of the crushing roller, a cross section of an annular dam ring disposed on the upper surface of the outer peripheral end of the rotary table. The configuration is such that the inner peripheral side is formed into an inclined surface whose diameter increases upward.

[0008]

[Operation] When a grinding roller having a cylindrical or frustoconical peripheral surface is placed on a disk-shaped rotary table and driven to rotate, and when the vertical cross-sectional shape of the dam ring is rectangular, at the bottom of the grinding roller, Due to geometrical restrictions, a gap remains between the outermost end of the grinding roller and the inner peripheral surface of the dam ring,
The crushing roller cannot be moved outside any further. On the other hand, in the longitudinal sectional shape of the dam ring according to the present invention, the inner peripheral surface is not vertical and is an inclined surface that expands outward as it goes upward, so the inner surface of the dam ring at the closest point X described above. A gap is formed between the (slope) and the outer peripheral edge of the crushing roller, and the entire crushing roller can be moved outward accordingly. Further, as a result, the outer peripheral end of each of the crushing rollers between X and X moves outward, so that the crushing efficiency is improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. 1 to 4 relate to an embodiment of a vertical crusher of the present invention, FIG. 1 is a schematic plan view of a main part, FIG. 2 is a schematic side view of a main part, FIG. 3 is a schematic front view of the main part, and FIG. 4 is a dam. It is a longitudinal section showing various examples of a ring. Since the structure of the vertical crusher 1 other than the dam ring is as described in the conventional art, the description thereof is omitted.

The dam ring 3B of the present invention has the cross-sectional structure shown in various embodiments of FIG. 4, and has a downwardly convex slope in FIG. 4 (a), and an inclined surface in FIG. 4 (b). 4C shows a straight line, and FIG. 4C shows a sloped surface which is convex upward. In both cases, the conventional rectangular cross-section structure is obtained by removing the defective portion P indicated by the two-dot chain line in the figure. Dam ring 3
By forming B in such a shape, the closest point X between the inner peripheral surface of the dam ring 3B shown in FIG.
Not only can the point X be driven outward by the amount of the defective portion P generated, but also the point directly below the crushing roller where the crushing surface pressure is much higher than the point X and each point between X and X can be moved to the outside. ， The crushing efficiency is improved accordingly. On the other hand, since the height of the dam ring 3B can be maintained as it is, the dam ring 3B
The demerit of changing the cross-sectional shape from a rectangular cross-section to an inner peripheral inclined surface as in the present invention does not occur.

In other words, the dam ring of the present invention is a dam ring having a rectangular cross section used in the prior art.
Focusing on the geometrical constraint when a cylindrical or truncated cone crushing roller was placed on the outer side of a disk-shaped rotary table, the inner surface of the dam ring was made an inclined surface with a diameter increasing toward the top. By utilizing the gap corresponding to the defective portion and moving the crushing roller as a whole to the outside by that amount, it is intended to improve the crushing efficiency mainly by utilizing the characteristics of the crushing roller having a large crushing action on the outer diameter side. It is an intention.

The dam ring of the present invention and a conventional dam ring having a rectangular cross section were tested by the same vertical crusher under the same raw materials and under the same crushing conditions. Regarding the particle size, the Bren value (specific surface area per 1 g of the product: cm ² / g) was improved by about 10%.

[0013]

As described above, in the vertical crusher according to the present invention, the inner peripheral surface of the rotary table is an inclined surface whose diameter increases upward while the outer diameter of the rotary table remains unchanged. As a result, the grinding efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an essential part showing an embodiment of a vertical crusher of the present invention.

FIG. 2 is a schematic side view of an essential part showing an embodiment of a vertical crusher of the present invention.

FIG. 3 is a schematic front view of essential parts showing an embodiment of a vertical crusher of the present invention.

FIG. 4 is a vertical sectional view of various dam rings showing an embodiment of the vertical crusher of the present invention.

FIG. 5 is an overall vertical sectional view of a conventional vertical crusher.

FIG. 6 is a schematic plan view of a main part of a conventional vertical crusher.

FIG. 7 is a schematic side view of a main part of a conventional vertical crusher.

FIG. 8 is a schematic front view of a main part of a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical grinding machine 3A Rotary table 3B Dam ring 4 Grinding roller

Claims (1)

[Claims] 1. A plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of a rotary table, and a predetermined crushing pressure is applied to the crushing roller to crush the raw material between the upper surface of the rotary table and the peripheral surface of the crushing roller. In the vertical crusher, the cross-sectional shape of an annular dam ring disposed on the upper surface of the outer peripheral end of the rotary table is formed into an inclined surface whose inner peripheral side expands upward. ..