JPH06343888A - Vertical pulverizer - Google Patents

Abstract

PURPOSE:To eliminate the excessive thickness of a material layer generated on a turntable to maintain the uniform thickness of the material layer and to prevent abnormal vibration due to the severe vertical motion of a grinding roller. CONSTITUTION:A scraping box 30 for eliminating the excess from a turntable 3A when material exceeding the thickness of a material layer having a specific height is introduced is freely ascendably and descendably arranged on the upstream side of each grinding roller 4 on the turntable 3A.

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, chemicals, etc. by cooperation of a rotary table and a pulverizing roller. The present invention relates to a vertical crusher that reduces abnormal vibration of the vertical crusher caused by uneven thickness of the raw material layer.

[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
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 on 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 portion, 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.

On the other hand, during the operation of the vertical crusher, vibration is constantly generated in the vertical crusher due to the crushing of the lumps of raw material into powder and granules, and the amplitude of these vibrations is large under normal conditions. Is about 50μ, and there is no hindrance to the continued operation. However, in addition to such a normal vibration, the amplitude is 100μ.
Occurrence of abnormal vibrations with large amplitudes exceeding. One of the causes of the abnormal vibration that occurs in such a vertical crusher is, for example, as shown in FIG. 6, there is a portion where the raw material layer thickness on the rotary table is not constant and the layer thickness increases rapidly. As the table rotates, the crushing roller comes into contact with this portion. As a result, the crushing roller is suddenly lifted against the hydraulic tension force to rise and then suddenly descends. Therefore, the swelling raw material layer, which rises after this rise and is strongly struck by the raw material layer, is destroyed and the crushing roller further sinks, so that the crushing roller reciprocates up and down with a large amplitude to vibrate the table. For this reason,
The material layer thickness that was formed in a stable state is destroyed, causing abnormal vibration of the mill. FIG. 7 is actual measurement data showing this state.

[0007]

As described above, in the conventional vertical crusher, an effective means for preventing a sharp vertical vibration of the crushing roller for a short time due to the presence of a particularly large thickness of the raw material layer is taken. However, there has been a demand for a means for preventing an emergency stop of operation and equipment damage by eliminating such an excessive portion and maintaining a normal operating condition.

[0008]

In order to solve the above problems and prevent abnormal vibration, in the present invention, a plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of the rotary table to form a rotary table. In a vertical crusher for crushing the raw material supplied to the upper surface of the center part between the upper surface of the rotary table and the peripheral surface of the crushing roller by applying a predetermined crushing pressure to the crushing roller, the upstream side of each crushing roller on the rotary table. A scraping box for introducing a raw material having a raw material layer thickness of a specified height exceeding the specified height and transferring the raw material to the outside of the rotary table is arranged so as to be vertically movable.

[0009]

In the present invention, there is a particularly large portion of the raw material layer thickness on the rotary table, and therefore the normal raw material layer thickness is destroyed due to the severe vertical movement that occurs when the crushing roller passes through this portion. In order to prevent abnormal vibrations caused by the crushing roller, a scraping box in front of the crushing roller transfers excess material to the outer periphery of the scooping rotary table and drops it into the annular space passage, or discharges it out of the mill to supply the material. To be re-supplied as a raw material. In this way, the excessive raw material of the raw material layer thickness formed on the rotary table is removed before entering the pulverizing roller, so that only the normal raw material layer thickness enters the pulverizing roller and abnormal vibration is prevented.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 4 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 side view of a main part of a vertical crusher, FIG. 3 is a vertical sectional view of a main part of a vertical crusher, and FIG. 4 is a vertical view showing another embodiment. It is a principal part longitudinal cross-sectional view of a mold crusher. Figure 1
As shown in FIG. 3, a horizontal scraping box 30 having an opening 30a on the upstream side is arranged on the upstream side of each crushing roller 4, and one end of the scraping box 30 is fixed to the outside of the casing 15 of a hydraulic cylinder 40. It is fixed to the piston rod 40a and its height can be adjusted so that it can be vertically moved up and down. The scraping box 30 is generally arranged horizontally in the radial direction of the rotary table 3A as shown in FIG. 1, but the raw material scooped into the scraping box 30 is pressed against the succeeding raw material. For easier movement, the rotary table 3A may be obliquely attached to the rotation direction of the rotary table 3A so that the outer peripheral side of the rotary table 3A retracts to the downstream side of the inner peripheral side. Scraping box 3
0 is provided with a notch opening below the outer peripheral side wall, and a compressed air injecting pipe arranged from the outside of the mill is connected to the inner peripheral side wall to inject compressed air so that the raw material contained in the scraping box 30 It is transferred and dropped from the opening on the outer circumference to turn table 3
It is dropped into the annular space passage 14 provided below the outer peripheral end of A. Alternatively, the scraping box 30 is guided to the outside of the casing 15 to discharge the raw material to the outside of the vertical crusher 1, and the raw material is merged again with the transportation line of the raw material supply system to be recycled again to the vertical crusher 1 as raw material. A method of supplying may be used.

FIG. 4 shows another embodiment of the present invention, which is a cylindrical scraping box 30 having screw blades internally driven by a motor instead of the box-shaped scraping box 30. , The opening 30a on the upstream side and the scraper 30 attached to the lower end thereof
By the action of c, the raw material taken inside is transferred in the axial direction.

The operation of the present invention configured as above will be described. As shown in FIGS. 3 and 4, a command is issued to the hydraulic unit 42 to operate the hydraulic cylinder 40 to set the lower end height of the scraping box 30 to a desired raw material layer thickness. After the height of the scraping box 30 is adjusted in this way, the operation is started. When the raw material layer thickness becomes uneven during the operation and the raw material layer thickness is larger than the predetermined raw material layer thickness, it is scooped up by the scraper 30c and introduced into the scraping box 30, as shown in FIG. 3 and FIG. In the first embodiment shown in FIG. 3, the internal raw materials are pressed by the raw materials that are successively taken into the scraping box 30, move in the axial direction of the scraping box 30, and move from the opening of the end face of the rotary table to the annular space passage 14. Fall to. Further, in the scraping box 30 provided with the compressed air injection pipe 30b, the raw material in the scraping box 30 is transferred by the pressing force of the compressed air injected from the inner peripheral side end surface.
On the other hand, in the embodiment of FIG. 4, the raw material taken into the scraping box 30 is transferred to the outer peripheral side by the conveying force of the rotating screw blade 30d. The raw material thus dropped into the annular space passage 14 is guided to the outside of the mill and returned to the transportation line of the raw material supply system again. Further, in the case where the scraping box 30 is extended to the outside of the mill, it is returned to the raw material supply system by a transportation line installed outside the mill.

As described above, in the present invention, an excessive amount of raw material is placed on the rotary table 3A by the scraping box 30 which is arranged upstream of each crushing roller 4 on the rotary table 3A and has the opening 30a on the upstream side. Since it can be further eliminated, it is possible to eliminate the momentary violent up-and-down movement of the crushing roller 4 caused by the excessive biting of the raw material, and prevent the abnormal vibration accompanying this.

[0014]

As is apparent from the above description, in the vertical crusher of the present invention, a portion of the rotary table having an excessively large material layer thickness is eliminated immediately before contacting the crushing roller to obtain an appropriate material layer thickness. Since it is made uniform, abnormal vibration can be prevented. Therefore, the driving operability and the maintainability are improved, the continuous stable operation is secured, and the productivity is 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 side view of a main part of a vertical crusher according to an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a vertical crusher according to an embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a main part of a vertical crusher according to another embodiment of the present invention.

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

FIG. 6 is an explanatory diagram showing the behavior of a crushing roller in a conventional vertical crusher.

FIG. 7 is a characteristic curve diagram showing actual measurement data of raw material layer thickness and crushing roller vibration in a conventional vertical crusher.

[Explanation of symbols]

 1 Vertical Grinding Machine 3A Rotating Table 3B Dam Ring 4 Grinding Roller 14 Annular Space Passage 15 Casing 16 Discharge Port 17 Raw Material Input Chute 20 Heat Duct 30 Scraping Box 30a Open 30b Compressed Air Injection Pipe 30c Scraper 30d Screw Blade 40 Hydraulic Cylinder 42 Hydraulic unit

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 the raw material supplied to the upper surface of the central portion of the rotary table is given a predetermined crushing pressure to the crushing roller to provide the upper surface of the rotary table and the crushing roller. In a vertical crusher for crushing between a peripheral surface and a peripheral surface, a scraping box for introducing a raw material having a raw material thickness exceeding a specified height to the upstream side of each crushing roller on the rotary table and transferring the raw material to the outside of the rotary table. Vertical crusher that can be vertically moved up and down.