JPH0780337A - Vertical crusher - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a vertical crusher with increased biting efficiency of a crushing roller and improved crushing efficiency. [Structure] Small preliminary crushing rollers 4A and large diameter main crushing rollers 4B are alternately arranged on a rotary table 3A, and main crushing rollers 4B are arranged on the downstream side of a movement path Q of crushed products of the preliminary crushing rollers 4A. It was set up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical crusher for crushing raw materials such as cement raw materials, slag, clinker, ceramics and chemicals by the cooperation of a rotary table and a pulverizing roller, and particularly, it has a high pulverizing efficiency. The present invention relates to a vertical crusher intended for improvement.

[0002]

2. Description of the Related Art FIG. 4 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
At the lower part of the cylindrical casing 15, a disk-shaped rotary table 3A driven by a speed reducer 2 by a motor 2A to rotate at a low speed, and hydraulically pressure-contacted with a portion equally dividing the outer peripheral portion of its upper surface in the circumferential direction, and driven to rotate. And a plurality of crushing rollers 4.

The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 through an arm 5 and an arm 7 which are pivotally supported by a shaft 6 in a casing 15, and by operating the hydraulic cylinder 9, The crushing roller 4 is pressed against the rotary table 3A to apply a crushing pressure to the raw material. 3B is a dam ring provided on the outer periphery 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 a product together with gas, and 17 is a raw material charging chute.

In such a vertical crusher, the raw material supplied to the central portion of the rotary table by the raw material chute 17 receives the centrifugal force in the radial direction of the rotary table 3A and slides on the rotary table 3A. Sometimes the rotary table 3A receives a force in the direction of rotation,
It slides with A and makes 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 between the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axial direction and is bitten therein. It is crushed and crushed.

On the other hand, a gas such as air or hot air is introduced into the base of the casing 15 by a hot air duct 20, and this gas is an annular space between the outer peripheral surface of the rotary table 3A and the inner peripheral surface of the casing. By being blown up from 14, the pulverized fine powder is entrained in the gas and rises in the casing 15, and is subjected to the classification action by the blades 13A of the separator 13 located at the upper part, and the product having a predetermined particle size is discharged together with the gas through the discharge port 16 And sent to the next process.

[0006]

As described above, the conventional vertical grinding in which the grinding rollers having the same shape and the same average diameter are arranged at equal intervals on the circumference of the rotary table at the position equidistant from the center. In the machine, the raw material supplied near the center of the rotary table draws a spiral trajectory due to the centrifugal force of the rotary table toward the outer circumference of the rotary table. At this time, the raw material that is bitten by the crushing rollers is used for crushing. Most of the other raw materials pass through the dam ring around the outer circumference of the rotating table, fall into the outer annular space passage, and are blown up by the rising high-speed air stream to rotate again. Returned to the table. As a result of the dynamic simulation, the ratio of the raw material dropped in the center of the rotary table to be caught by the crushing roller is 3 with 4 rollers.
About 8%, about 25% for two rollers, most of the newly fed raw material bites into the crushing roller while repeating the process of once overflowing the rotating table and being blown back to the rising table on the rotating table. Eventually, it will be discharged to the outside of the mill with the specified particle size. Therefore, the efficiency of biting the raw material into the pulverizing roller is low, and the pulverizing efficiency is low. In addition, the dust concentration in the mill is increased, and the suction fan power is increased due to an increase in the differential pressure of the mill, resulting in an increase in running cost. .

[0007]

In order to solve the above problems and to increase the biting efficiency and improve the crushing efficiency, in the present invention, a preliminary crushing roller having an average diameter smaller than that of the auxiliary crushing roller is provided on the upper surface of the rotary table. Main crushing rollers having a large diameter are alternately arranged, and the raw material supplied onto the rotary table is applied with a predetermined crushing pressure to the preliminary crushing roller and the main crushing roller so that the upper surface of the rotary table and the peripheral surfaces of both crushing rollers. It is a vertical crusher for crushing in between, and the main crushing roller is arranged downstream of the movement locus of the crushed product of the preliminary crushing roller on the rotary table. According to a second aspect of the present invention, in the vertical crusher according to the first aspect of the present invention, further, each preliminary crushing roller is provided at a discharge port of a raw material charging chute vertically suspended on a central axis of the vertical crusher. A branch pipe for guiding the feed material to the raw material biting side was connected.

[0008]

In the present invention, the raw material of the new feed is first bit into the small-diameter preliminary crushing roller, preliminarily crushed by the preliminary crushing roller, and the coarsely crushed crushed product moves on the rotary table and almost all of the main crushed product is crushed. It is bitten by the rollers and crushed. The crushed product of the main crushing roller overflows the dam ring around the outer circumference of the rotary table and falls into the annular space passage, but is blown back upward by the ascending air current rising in the annular space passage, and the particle size changes. Correspondingly, it is conveyed to the separator, or falls by gravity on the way and is returned to the rotary table to be crushed again. In the second invention, since the branch pipe is provided at the discharge port of the raw material charging chute, most of the raw material exiting the branch pipe is bitten by the preliminary crushing roller and crushed or coarsely crushed, so that the load of the main crushing roller is reduced. To be done.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 relate to an embodiment of the present invention,
1 is a plan view of a main part of a vertical crusher, FIG. 2 is a vertical sectional view taken along line XX of FIG. 1, and FIG. 3 is a plan view of a main part of a vertical crusher showing another embodiment. As shown in FIG. 1, on a rotary table 3A of a vertical crusher 1, a preliminary crushing roller 4A having a small average diameter and a main crushing roller 4B having a large average diameter are alternately arranged. Like the vertical crusher, the crusher is placed near the outer circumference of the rotary table 3A, while the crushed product after crushing the preliminary crushing roller 4A moves on the rotating rotary table, and is just on the biting side of the main crushing roller 4B. Position it so that it reaches. In FIG. 1, almost all of the crushed products of the preliminary crushing roller 4A are directed to the main crushing roller 4B as indicated by the movement locus Q. The shape and size of the main crushing roller 4B are almost the same as those of the crushing roller 4 of the conventional vertical crusher, but the preliminary crushing roller 4A has the movement path Q spread and the rotary table of both crushing rollers 4A and 4B. Three
Considering the storage space on A, it is desirable to select the flat diameter and width to be about 50 to 80% of the main crushing roller 4B. In the example of FIG. 1, the crushing rollers 4A and 4B are arranged so that the straight line connecting the main crushing rollers 4B and the straight line connecting the preliminary crushing rollers 4A are orthogonal to each other. Considering the main grinding roller 4B
The crushing rollers 4A and 4B may be arranged so that the above-mentioned straight lines are not orthogonal to each other but obliquely intersect with each other so that the upstream crushing roller 4A and the upstream crushing roller 4A are close to each other. The main crushing roller 4B has a crushing surface pressure of about 150 to 250 kg / cm ² (depending on the pulverizability of the raw material and the desired product particle size), and the preliminary crushing roller 4B is the same as the value used in the vertical crusher. The tension of 4A is 20 to 60% of that of the main crushing roller 4B.
The degree. The other structure of the vertical crusher 1 is the same as that described in the conventional art except for the above, and the description thereof will be omitted. As with the conventional machine shown in FIG. 4, the raw material charging chute 17 adopts one that hangs vertically on the central axis,
As shown in FIG. 2 constituting the second invention, the lower part of the raw material charging chute 17 is made into branch pipes 17a, 17a, and the discharge ports thereof are arranged immediately below the upstream sides of the respective preliminary crushing rollers 4A, 4A. . By doing so, almost all the raw material of the new feed is pre-crushed (crushed or roughly crushed) by the pre-crushing roller, so that the main crushing roller 4B
The raw material supplied to the new feed is sized compared to the new feed material, and the load is reduced, further improving the grinding efficiency. Further, in the embodiment of FIG. 3, the raw material charging chute 17 can be a vertical straight tube independent from the beginning since the two preliminary crushing rollers 4A, 4A are separated from each other.

The operation of the vertical crusher 1 of the present invention constructed as described above will be explained below.
The feed material dropped from the lower end of the (branch pipe 17a in the second invention) near the center of the rotary table 3A and immediately upstream of the preliminary crushing roller 4A (raw material biting side) has a transfer force of the rotating rotary table 3A. It moves to the outside of the rotary table 3A while drawing a spiral trajectory by the
It is bitten into A and coarsely crushed, and almost all of the crushed product is further crushed toward the main crushing roller 4B, overflows the dam ring 3B, and falls into the annular space passage 14. In the annular space passage 14, the granular material containing the powder of the pulverized raw material is blown up by the ascending air current rising in the annular space passage 14 at a high speed, and is transferred by air to the separator 13 installed at the top of the vertical crusher 1. The product powder that is carried, classified, and below the classification point is discharged from the vertical crusher 1.
Coarse powder and granules above the classification point of the separator 13 are returned to the rotary table 3A and re-pulverized until a prescribed particle size is reached. In the present invention, the main crushing roller 4B is disposed downstream of the movement path of the crushed products of the small-diameter preliminary crushing roller 4A, and in the second invention, a branch for guiding the raw material to the raw material biting side of each of the preliminary crushing rollers 4A, 4A. Put the tube 17a into the raw material charging chute 1
Since it is connected to No. 7, the raw material for New Feed is efficiently preliminarily crushed and then crushed by the main crushing roller 4B. Therefore, the raw material that is bitten into the main crushing roller 4B becomes a fine-grained powder that is finer than in the new feed state, the load on the main crushing roller 4B is reduced, and the raw material layer having a constant layer thickness is crushed. As a result, the grinding efficiency is significantly improved. In addition, the fact that the raw material overflowing the rotary table 3A reaches 62 to 75% without the crushing opportunity unlike the conventional machine is solved, and the waste of large-diameter raw material repeatedly moving between the annular space passage and the rotary table. The behavior is drastically reduced, the residence time in the mill is reduced, the dust concentration in the mill is reduced, and the differential pressure in the mill (pressure loss between the mill inlet and outlet) is reduced, so the power of the suction fan for ventilation in the mill is reduced. The running cost is reduced. Moreover, abnormal vibration is reduced by reducing the differential pressure of the mill, and stable and quiet operation is continued.

[0011]

As described above, in the present invention,
As the biting efficiency increases, the crushing efficiency is improved, the running cost is reduced, stable continuous operation can be continued, and operability and maintenance are improved.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a vertical crusher according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along line XX of FIG.

FIG. 3 is a plan view of a main part of a vertical crusher showing another embodiment of the present invention.

FIG. 4 is an overall vertical sectional view of a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical grinding machine 3A Rotary table 3B Dam ring 4 Grinding roller 4A Preliminary grinding roller 4B Main grinding roller 13 Separator 15 Casing 17 Raw material chute 17a Branch pipe Q Trajectory

Claims (2)

[Claims] 1. A preliminary crushing roller having a small average diameter and a main crushing roller having a large average diameter are alternately arranged on the upper surface of a rotary table, and the raw material supplied onto the rotary table is supplied to the preliminary crushing roller and the main crushing roller. A vertical crusher for applying a predetermined crushing pressure to crush between an upper surface of a rotary table and peripheral surfaces of both crushing rollers, the main crusher being located downstream of a moving path of a crushed product of the preliminary crushing roller on the rotary table. Vertical crusher with crushing rollers. 2. A branch pipe for guiding a feed material to a raw material biting side of each preliminary crushing roller is connected to a discharge port of a raw material charging chute vertically suspended on a central axis of a vertical crusher. Vertical crusher described.