JPH03213154A - Vertical grinder - Google Patents

Abstract

PURPOSE:To enhance maintenance properties by fixing the bearing supporting the rotary shaft of an auxiliary roller to the mounting seat mounted to the opening part of the casing of a vertical grinder and providing the pin fulcrum capable of revolving the mounting seat to the lower end part of the mounting seat. CONSTITUTION:A plurality of freely rotatable grinding rollers 4 are arranged on the upper surface of the outer peripheral part of a turntable 3A and predetermined grinding pressure is applied to the grinding rollers 4 to grind the raw material supplied to the central part of the turntable 3A between the upper surface of the turntable 3A and the peripheral surfaces of the grinding rollers 4. A freely rotatable auxiliary roller 20 compressing the layer of the raw material forcibly supplied to the grinding rollers 4 by its peripheral surface is arranged to the upper surface of the outer peripheral part of the turntable 3A between the grinding rollers 4. The bearing 26 supporting the rotary shaft 25 of the auxiliary roller 20 is fixed to the mounting seat 100 mounted to the opening part of the casing of a vertical grinder and a pin fulcrum 120 capable of revolving the mounting seat 100 is provided to the lower end part of the mounting seat 100. As a result, maintenance properties are enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vertical pulverizer that pulverizes raw materials such as limestone, slag, and cement raw materials through cooperation between a rotary table and pulverizing rollers.

[Prior Art] As a type of pulverizer that finely pulverizes raw materials such as limestone, slag, and cement raw materials into powder, there is a vertical pulverizer 1 equipped with a rotary table and pulverizing rollers, as shown in FIG. is widely used. This type of crusher includes a disc-shaped rotary table 3A that is driven by a motor 2A and a reducer 2 to rotate at a low speed in the lower part of a cylindrical casing 15, and a hydraulic pressure installed at a portion that equally divides the outer periphery of the upper surface in the circumferential direction. The crushing roller 4 is provided with a plurality of crushing rollers 4 that are pressed against each other and rotated as a result of rotation.

The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 5 and an arm 7 that are pivotally supported by a shaft 6 on a casing 15. By operating the hydraulic cylinder 9, the crushing roller 4 is 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 periphery of the rotary table 3A to adjust the raw material layer pressure; 14 is an annular space passage around the rotary table 3A for blowing up gas; 13 is a rotary separator for classifying the raw material crushed by the blades 13A; 16 17 is a discharge port from which the product is taken out along with the gas, and a raw material input chute.

In such a vertical crusher, the raw material supplied to the center of the rotary table by the raw material input chute 17 is rotated as it slides on the rotary table 3A due to the centrifugal force in the radial direction of the table due to the rotation of the rotary table 3A. It receives a rotational force from the 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. Since a roller is in pressure contact with this outer circumferential portion and rotates, the raw material drawing a spiral line enters between the crushing roller 4 and the rotary table 3A from a direction forming a certain angle with the roller axial direction and is bitten. crushed.

On the other hand, air is supplied to the base of the casing 150 by a duct.
Alternatively, gas such as hot air is introduced, and as this gas blows up from the annular space 14 between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing, the crushed fine powder is entrained in the gas. and rise inside the casing 15,
A classification action is performed by the blades 13A of the separator 13 located at the top, and products with a predetermined particle size are discharged from the discharge port 16 together with gas and sent to the next process.

[Problems to be Solved by the Invention] By the way, in a vertical crusher having a raw material crushing mechanism based on the cooperation of the rotary table 3A and the crushing rollers 4 as described above, it is particularly important to avoid slippery and fluid particles on the rotary table 3A. When pulverizing a raw material that has a behavior, the pulverizing roller sometimes gets caught in the raw material intermittently, resulting in poor pulverizing efficiency. That is, especially when the pulverized raw material has a low moisture content, such as tankar (
In the case of materials such as limestone) or slag, the behavior of the raw material particles on the rotary table is fluid and slippery;
Particles tend to break apart, and for this reason, when the material is supplied from the raw material chute to the center of the rotary table and reaches the crushing rollers, it is pressed onto the rotary table with a predetermined hydraulic pressure and a crushing force is applied. When there is a situation where there is a high proportion of raw materials that are scraped by the crushing rollers that are not caught in the crushing rollers, or when there is a situation where the raw materials are blocked on the biting side of the crushing rollers and there is a raw material stored here, The situation was such that the raw material was not stably and continuously caught in the grinding roller.

Furthermore, the raw material that has been crushed once by the crushing roller is further bitten by the next crushing roller and is gradually crushed into products, but the raw material that leaves the crushing roller is between the crushing roller and the rotating table. The gap between the particles is compressed and the particles pop out from the narrow gap in the grinding section, and the particles break apart into a stable layer that reaches the nipping section of the next grinding roller. However, the grinding efficiency tends to be poor due to this reason.

The present invention was developed in view of the problems of the conventional vertical crusher, and it consolidates the layer of raw material to prevent the raw material from falling apart and prevents the raw material from being caught in the crushing rollers. The purpose is to improve the pulverization efficiency of vertical pulverizers by improving the pulverization efficiency of vertical pulverizers.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a layer of raw material to be bitten into the grinding roller is consolidated on the upper surface of the outer peripheral part of the rotary table between the grinding rollers. It is equipped with a rotatable auxiliary roller.

Further, this auxiliary roller is disposed on the upper surface of the outer peripheral part of the rotary table close to the raw material biting side of the crushing roller.

Furthermore, a bearing that supports the rotating shaft of this auxiliary roller is fixed to a mounting seat, and this mounting seat is attached to an opening provided in the casing of the vertical crusher, and the lower end of this mounting seat is supported by a pin. The mounting seat can be rotated.

[Operation] The raw material supplied from the raw material input chute to the upper surface of the center of the rotary table traces a spiral trajectory on the rotary table, moves toward the outer circumference of the rotary table, reaches the biting side of the auxiliary roller, and connects the auxiliary roller and the rotary table. When the raw material particles flow between the auxiliary roller and the raw material particles, the auxiliary roller rotates and compresses the raw material particles with the required pressing force on its circumferential surface, and each compressed raw material particle is brought into a dense state, forming a so-called compacted layer. Ru. This compacted layer reaches the biting side of the crushing roller by the rotation of the rotary table, and even if the crushing roller is applied with a high pressing force as crushing force, it will be bitten with a higher probability and continuous crushing will be performed. Also, it is crushed by a crushing roller into small pieces, and then released from the non-biting side of the crushing roller. The raw material particles flowing as a coarse and dense layer are subjected to a similar compaction effect by this auxiliary roller, and are bitten into the next crushing roller with a high probability and are efficiently crushed. The pressing force of the auxiliary roller toward the top of the rotary table does not contribute to pulverization, but instead compresses the raw material particles to form a layer with dense particles, the so-called consolidation layer (hereinafter, the action of forming such a layer is called consolidation). ), which is much smaller than the pressing force of the crushing roller.

When the above-mentioned auxiliary roller is arranged close to the raw material nipping side of the crushing roller, the new raw material from the raw material input chute guided to the outer periphery of the rotary table flows into the raw material nipping side of the crushing roller and becomes auxiliary. Since the proportion of raw material flowing into the raw material biting side of the roller increases, the compacted layer in which the raw material particles are compressed by the auxiliary roller and made dense is less likely to be disturbed by the new raw material, and the biting into the crushing roller becomes more reliable. It is done.

Of course, the raw material crushed by the previous crushing roller and the new raw material are consolidated together by this auxiliary roller.

The auxiliary roller has a bearing that supports the rotating shaft attached to the mounting seat, and the mounting seat can be rotated around a pin fulcrum provided at the lower end, so that the auxiliary roller can be integrally rotated to the outside. Therefore, the auxiliary roller can be attached/detached and replaced outside the vertical crusher, improving work efficiency.

[Example] Next, embodiments of the present invention will be described based on the drawings.

1 to 3 illustrate a first embodiment of the present invention.

First, the present invention will be explained in detail with reference to FIGS. 1 to 3.

In FIG. 1, FIG. 1(A) is a plan view showing the arrangement of the crushing roller and auxiliary roller on the rotary table, FIG. 1(B) is a front development view of FIG. 1(a), and FIG. The figure is a perspective view showing the entire vertical crusher, and FIG. 3 is a side view of the auxiliary roller attachment part. In addition, in the figure, the same parts as in FIG. 4 are given the same reference numerals, and the explanation thereof will be omitted.

As shown in FIGS. 1 and 2, two crushing rollers 4 are arranged on the upper surface of the outer peripheral part of the rotary table 3A at symmetrical positions with respect to the center of the rotary table 3A.
The raw material biting side 4 of each crushing roller 4 is located on the upper surface of the outer peripheral part of the rotary table 3A between where the crushing roller 4 and the crushing roller 4 are located.
An auxiliary roller 20 having a smaller diameter than the crushing roller 4 is arranged at a position closer to A.

The bearing 26 of the roller shaft 25 of the auxiliary roller 20 is
As shown in FIG. 3, a compression coil spring 130b is rotatably connected at a pin fulcrum 120 to a bracket 11O fixed to the inner surface of a mounting seat 100 that is attached like a lid to the opening of the casing 15, and is enclosed inside. The auxiliary roller is pressed downward by the action of an auxiliary roller rolling down device 130 having a rolling down rod 130a that advances into the mill by the urging force of the auxiliary roller. Further, the mounting seat 100 is supported by a pin at a bracket 140 fixed to the casing 15 and a pin fulcrum 150, and is configured to be rotatable.

The reduction blade of the auxiliary roller 20 in the auxiliary roller reduction device 130 is adjusted by changing the position of the seat plate 130c of the compression coil spring 130b.

In the embodiment of the present invention, a compression coil spring is used as the reduction blade of the auxiliary roller, but a hydraulic cylinder may also be used instead.

Note that if the weight of the auxiliary roller 20 is sufficient as the compressive force for the raw material layer, the compression coil spring 130b is left free.

Next, the operation of the embodiment having such a configuration will be explained.

The raw material supplied from the raw material input chute 17 to the upper surface of the central part of the rotary table 3A is subjected to the centrifugal force of the rotary table 3A, and moves toward the outer circumference of the rotary table while drawing a spiral trajectory on the rotary table 3A. As shown in (B), most of these raw materials.

The raw material that has already been crushed and made into fine powder by the crushing roller 4 is combined with the raw material to form a coarse and dense layer 40 that is passed to the auxiliary roller 2.
0 and the upper surface of the rotary table 3A, and the auxiliary roller 20 rotates while being slightly lifted by the raw material layer, compressing this coarse and dense layer 40 between its peripheral surface and the upper surface of the rotary table 3A. to form a consolidated layer 30. This compacted layer 30 is formed by the crushing roller 4 by rotation of the rotary table 3A.
reaches the biting side 4A, where the raw material particles are not scattered but are formed into a dense compacted layer, so the crushing roller 4 is applied with a high pressing force as a crushing force, and Even if there is a narrow gap between the upper surface of the rotary table 3A and the product particle size of , the proportion (amount) of raw material flowing past its sides is reduced. This improves the pulverization efficiency. In addition, in FIG. 1(A), F
is the moving trajectory of the raw material particles, C is the roller and rotary table 3A
The biting part (pulverization part) between the two is shown, and the movement trajectory of the raw material particles is shown only in the right half of the figure.

At this time, the auxiliary roller 20 is given a so-called consolidation effect that compresses the particles of the raw material to increase the density of the layer between the particles, and a low pressure that does not contribute to pulverization of the raw material is applied to the compression coil spring. It is given by adjusting the compressed length. The pressing force of this auxiliary roller 20 needs to be much smaller than the crushing force of the crushing roller 4, and if its own weight is sufficient, there is no need to provide a rolling blade. It varies depending on the particle size and the degree of adhering moisture; for example, when the raw material particle size is small, the pressing force may be small.

The raw material that has been bitten by the crushing roller 4 and crushed into small pieces is subjected to compressive force in the narrow gap between the crushing roller 4 and the rotary table 3A, and then receives the rotational force of the rotary table 3A and the crushing roller 4. , the raw material discharge side 4 of the crushing roller 4
The particles are vigorously ejected from B and fly up, causing the particles to become separated from each other, and are mixed with the new raw material supplied from the raw material input chute 17 to form a dense layer 40. The coarse and dense layer 40 is subjected to the same compaction effect as described above by the auxiliary roller 20 located next, and is further bitten and crushed by the crushing roller 4 located on the rotational direction side of the rotary table 3A, thereby reducing the product particle size. As the compaction layer 30 comes out from the auxiliary roller 20, the auxiliary roller 20 approaches the biting side 4 of the crushing roller 4.
Since it is located close to A, the amount of new raw material supplied from the raw material input chute 17 onto the rotary table 3A is reduced, so that the consolidated state is less likely to be disturbed. The roller 4 will be caught more reliably. In addition.

In this embodiment, the case where the diameter of the auxiliary roller 20 is smaller than the diameter of the crushing roller 4 has been described. When the particle size of the raw material particles is large, the diameter is increased to a size that can provide a consolidation effect in accordance with the particle size of the raw material particles.

The auxiliary roller of the present invention can be attached to the auxiliary roller shaft by rotating the mounting seat around the pin fulcrum 150.

The bearing can be rotated externally as a unit, so it is installed.

Easy to remove and improve work efficiency.

[Effects of the Invention] As is clear from the above explanation, in the present invention, the raw material particles can be compressed by the auxiliary roller to form a compacted layer with dense gaps between the particles, so that the raw material can be crushed with high crushing force. When the raw material tries to bite into the grinding roller that has been given a pressing force, it is less likely to be scraped by the grinding roller and escape through the side of the grinding roller, improving the ability of the raw material to bite into the grinding roller. It is easy to slip on the zero-rotation table, and the grinding action can be carried out continuously, improving the grinding efficiency.
This method is particularly effective when pulverizing raw materials with so-called fluidity or raw materials with little moisture attached.

Furthermore, since the auxiliary roller and the bearing can be taken out together with one touch, the maintenance workability is excellent.

[Brief explanation of drawings]

1 to 3 show examples of the present invention, FIG. 1(A) is a plan view of the crushing roller and the auxiliary roller, and FIG. 1(B) is the same as that of FIG. 1(A). 2 is an overall perspective view of the crusher, FIG. 3 is a side view of an auxiliary roller attachment part, and FIG. 4 is a vertical sectional view of a conventional vertical crusher. 1... Vertical crusher, 3A... Rotating table, 4... Grinding roller, 4A... Raw material biting side, 4B... Raw material discharge side. 17... Raw material input chute, 20... Auxiliary roller, 25... Auxiliary roller shaft, 26... Bearing, 30...
・Consolidated layer, 40...Dense layer, 100...
...Mounting seat, 110...Bracket, 120...Pin fulcrum, 130...Auxiliary roller lowering device, 130a...
- Pressure rod, 130b...compression coil spring. 140...Bracket, 150...Pin fulcrum.

Claims (1)

[Claims] (1) A plurality of rotatable crushing rollers are arranged on the upper surface of the outer periphery of the rotary table, and a predetermined crushing pressure is applied to the raw material supplied to the center of the rotary table to the crushing rollers, and the raw material is crushed between the upper surface of the rotary table and the circumferential surface of the crushing rollers. In the vertical crusher, a rotatable auxiliary roller is provided on the upper surface of the outer periphery of the rotary table between the crushing roller and the crushing roller, and the auxiliary roller is rotatable to compress the layer of raw material bitten into the crushing roller with its circumferential surface. A bearing that supports the rotating shaft of the auxiliary roller is fixed to a mounting seat attached to the opening of the casing of the vertical crusher, and a pin fulcrum capable of rotating the mounting seat is fixed to the mounting seat. A vertical crusher characterized by being installed at the bottom end.