JP3216677B2 - Crushing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The pulverizing equipment of the present invention uses a vertical pulverizer as a preliminary pulverizer of a finishing mill such as a ball mill, and is particularly a hard and hard-to-pulverize raw material such as cement clinker and blast furnace slag. The present invention relates to a pulverizing facility provided with a preliminary pulverizer capable of operating continuously and stably at a relatively high pulverizing capacity by suppressing abnormal vibration.

[0002]

2. Description of the Related Art As one type of a pulverizer for finely pulverizing chemicals such as limestone, blast furnace slag, and cement raw material into powder, a vertical pulverizer having a rotary table and a pulverizing roller as shown in FIG. 1 is widely used. This type of pulverizer has a motor 2 at the lower part of the cylindrical casing 15.
A disk-shaped rotary table 3A, which is driven by the speed reducer 2 by A and rotates at a low speed, and a plurality of crushing rollers 4 which are driven to rotate by pressure contact with hydraulic pressure or the like at a position equally dividing the outer peripheral portion of the upper surface in the circumferential direction. Have.

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 a casing 15. The crushing roller 4 is pressed on 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 thickness of the raw material layer, 14 is an annular space passage for gas blowing around the rotary table 3A, 14A is a gas supply path, and 13 is a raw material pulverized by the blade 13A. A rotary separator for classification, 16 is an outlet for taking out the product together with the gas, and 17 is a raw material input chute.

In such a vertical pulverizer, the raw material supplied to the center of the rotary table by the raw material charging chute 17 receives the centrifugal force in the table radial direction by the rotation of the rotary table 3A and slides on the rotary table 3A. Sometimes, a force in the rotating direction is received by the rotating table 3A, and the rotating table 3A
And a rotation somewhat slower than the rotation speed of the turntable 3A is performed. The above two forces, that is, the forces in the radial direction and the rotational direction are combined, and the raw material moves to the outer peripheral portion of the rotary table 3A along a spiral trajectory on the rotary table 3A. Since a roller is pressed against this outer peripheral portion and is rotating, the raw material describing the spiral enters the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axis direction and bites. Rarely crushed.

On the other hand, a gas such as air or hot air is guided to the base of the casing 15 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, so that the pulverized fine powder is entrained by the gas and the casing 1
5, the product having a predetermined particle size is discharged from the discharge port 16 together with the gas and sent to the next step.

[0006] In recent years, the demand for the product particle size of the pulverized raw material has been increasing year by year, and the finer product particle size has been increasingly desired as referred to as fine pulverization or ultra-fine pulverization. Therefore, it is difficult to meet the demand with a single crusher, and for this reason, for example, a vertical crusher without a built-in crushed product classifier as a preliminary crusher before charging the raw material into a finishing mill such as a ball mill. A method has been adopted in which a pulverized product of a vertical pulverizer is used and sieved with a vibrating sieve to supply only fine powder to a finishing mill. FIG. 5 shows a flow sheet in this case. The raw material of the raw material hopper 50 passes through the constant feedware 52 and is pulverized by the vertical pulverizer 1, and the product is guided to the vibrating sieve 90 via the bucket elevator 80 and is screened. , Fine powder only finishing mill (ball mill) 10
0, and the oversized product is returned to the vertical mill 1
Is preliminarily crushed.

[0007]

In a two-stage pulverization using a combination of pre-pulverization and finish pulverization shown in such a flow sheet, a pulverization facility using a vertical pulverizer without a built-in classifier as a pre-pulverizer has a problem in that cement is used. Although it has the advantage of being able to grind raw materials that are difficult to grind, such as clinker and blast furnace slag, with higher productivity and lower power consumption compared to grinding equipment with only a single finishing mill, it has the advantage of being a vertical grinding machine as a preliminary grinding machine In the case of cement clinkers containing a large amount of fine particles, not only do the raw materials bite into the crushing rollers and the crushing efficiency is low, but also frequent mill abnormal vibrations make it difficult to maintain continuous stable operation. In some cases, evacuation of the supply amount or shutdown caused productivity deterioration.

[0008]

Means for Solving the Problems In order to solve the above problems, the crushing equipment of the present invention is a crushing equipment using a vertical crusher as a preliminary crusher. Has a plurality of rotatable crushing rollers arranged on the upper surface of the outer periphery of the rotary table, and applies a predetermined crushing force to the crushing rollers to crush the raw material between the upper surface of the rotating table and the peripheral surface of the crushing rollers. A dispersing plate of the raw material, which is erected above the center of the rotating table and rotates integrally with the rotating table, and a supply port for the raw material to the dispersing plate, which is provided around the dispersing plate and has a top portion. A feedstock comprising an air box and an air duct connected to the air box and guiding the compressed air containing fine particles in the feedstock out of the system, the feedstock being provided with a plurality of inlets for injecting compressed air into the inside thereof; Raw material size sorting equipment Accommodating the inside, of the air box
Side attached to perforated metal and perforated metal
And a raw material supply facility for supplying raw materials to the vertical pulverizer, the vertical pulverizer, and the pulverized product of the vertical pulverizer to be pulverized. A pulverizing facility comprising a finishing mill, a classifying device for classifying pulverized products of the finishing mill, and a transport system connecting these devices is provided.

[0009]

In the pulverizing equipment of the present invention, in a vertical pulverizer for performing pre-pulverization, the raw material is preliminarily classified in a mill, fine particles are taken out without being subjected to pulverization, sent to a finishing mill, and fine particles are removed. Only the remaining coarse particles are crushed by a vertical crusher, and the product is sent to a finishing mill,
The crushing efficiency of the vertical crusher is improved, the load on the finishing mill is reduced, and the crushing efficiency of the entire crushing equipment is increased.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The 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 flow sheet of a crusher, FIG. 2 is an overall vertical sectional view of a vertical crusher, and FIG. 3 is an enlarged vertical sectional view of a main part of the vertical crusher. In FIG. 1, 50 is a raw material hopper (50a is a clinker hopper, 50b is a gypsum hopper), 50A and 50B.
Is a metering machine for cutting clinker and gypsum, 1A
Is a vertical mill, 70 is a belt conveyor, 80 is a bucket elevator, 100 is a finishing mill (tube mill), 10
0A is a bucket elevator, 110 is a cyclone separator, 110A is a circulation fan, 120 is a dust collector, 13
0 is a suction fan. As the finishing mill 100, a ball mill or a rod mill is usually used, and the cyclone separator 11 is used.
0 is connected to a closed circuit, and the coarse powder after classification is subjected to finishing mill 100.
Again to the inlet side of the tank. The fine powder is collected by a dust collecting device 120 such as a bag filter or an electric dust collector, and becomes a product.

Next, the structure and operation of the vertical crusher 1A will be described with reference to FIGS. The vertical pulverizer 1A of the present invention is obtained by removing the rotary separator 13 for pulverized products provided on the top of the conventional vertical pulverizer 1 shown in FIG. Rotary table 3A and rotary table 3 rotating about a vertical axis
A is a crushing roller 4 which is oscillated via an arm 5 and an arm 7 via a shaft 6 and is pressed by a hydraulic cylinder 9.
A dispersion plate 32 made of a horizontal disk is fixed on the top of the turntable 3A above the center of the turntable 3A via a column 32a, and a cylindrical air box coaxial with the dispersion plate 32 around the dispersion plate 32. 34 is suspended from the top plate 15 a of the casing 15. The air box 34 has a material supply port 36 at the top center.
A cylindrical raw material discharge port 38 is provided at the lower center so as to surround the column 32a, and the side surface and the inclined surface at the lower part of the side surface are formed of a punching metal (perforated plate) 34a having a large number of holes. Compressed air supply pipe 40 led to
Further, the compressed air supplied to the collecting pipe 42 connected thereto and the air chamber 44 formed around the side face is configured to be injected into the air box 34. An air duct 39 for discharging the injected compressed air is provided on the outer periphery of the top of the air box 34. The air duct 39 is connected to a cyclone separator 110 and a suction fan 130 (not shown). As described above, the injection port of the compressed air into the air box 34 is a large number of holes of the punched metal 34a adopted as the side surface and the inclined surface, but in order to distribute the compressed air into the air box 34, FIG. As shown in (1), it is desirable to attach a canvas (woven cloth) 34b to the inner surface of the punching metal 34a. The canvas 34b is bolted to the punching metal 34a. As described above, the vertical pulverizer 1A of the present invention removes the rotary separator 13 provided at the top of the conventional vertical pulverizer 1 shown in FIG.
And an electric motor and a speed reducer 2 (not shown).
A rotary table 3A that rotates about a vertical axis via a rotary table, and a crushing roller 4 that is oscillated via an arm 5 and an arm 7 via a shaft 6 and pressed by a hydraulic cylinder 9 on the rotary table 3A. The raw material supplied onto 3A is pulverized between the rotary table 3A and the pulverizing roller 4, overflows the rotary table 3A, falls into the annular space passage 14, is scraped by the scraper 60a, and passes through the stone discharging chute 60. Then, the sheet is conveyed out of the apparatus by the belt conveyor 70. An upward airflow is caused to flow through the annular space passage 14 by a duct (not shown), and fine powder in the raw material and pulverized fine powder are conveyed by air to the inside of the raw material discharge port 38 of the air box 34.

The operation of the vertical pulverizer 1A configured as described above will be described. The raw material supplied from the raw material supply port 36 falls onto the rotating dispersion plate 32, moves to the outer periphery in a spiral shape by centrifugal force, overflows the weir plate around the dispersion plate 32, and falls freely inside the air box 34. I do. On the other hand, the compressed air supply pipe 40 and the collecting pipe 4
Compressed air supplied via 2 is punched metal 3
The fine particles of 2 to 3 mm or less out of the feedstock that enters and passes through the canvas 4b and the canvas 34b ride this air flow, pass through the air box 34, and pass through the air duct 39.
Exhausted with air. On the other hand, the coarse particles fall onto the rotary table 3A from the raw material discharge port 38, are pulverized as described above, and are conveyed outside the machine by the belt conveyor 70 through the annular space passage 14. The adjustment of the sorting particle size in the raw material particle size sorting device 30 is performed by adjusting the damper of the downstream suction fan 130 connected to the air duct 39, depending on the amount of suction air. That is, as the air flow increases, the particle diameter of the fine particles discharged to the air duct 39 increases. The air box 34 is made of a punched metal (perforated plate) 34a having a large number of dispersed holes, and a canvas (woven cloth) 34b is further adhered to the inner surface of the punched metal 34a. As a result, the dispersion of the raw material particles falling from the periphery of the dispersion plate 32 is extremely high. As described above, in the vertical pulverizer 1A of the present invention, fine particles having a size of 2 to 3 mm or less are removed in advance and dropped on the rotary table 3A to be pulverized. As a result, the grinding efficiency is increased, the production amount is improved, and the occurrence of abnormal vibration can be prevented.

The pulverizing equipment of the present invention uses such a vertical pulverizer 1A as a preliminary pulverizer to remove fine particles from the raw material in advance, send the raw material to a finishing mill 100 via a cyclone separator 110, and preliminarily pulverize the raw material. Then, it is supplied to the finishing mill 100 via the belt conveyor 70 and the bucket elevator 80 to be pulverized. Finishing mill 100
The pulverized product pulverized in the cyclone separator 110
After being adjusted to a required fineness in a closed circuit formed by the above, the product is transferred from the cyclone separator 110 to the dust collecting device 120, and is collected as a product. A suction fan 130 downstream of the dust collector 120 controls the suction air volume of the vertical crusher 1A. The circulation fan 110A circulates a required amount of the total amount of dust-containing gas that has exited the cyclone separator 110 to the cyclone separator 110, and the ratio of the circulating air volume to the atmospheric air volume is usually about 80:20.

As described above, in the crushing equipment of the present invention, a raw material particle size separation device such as a vibrating sieve is not required between the vertical crusher 1A as a preliminary crusher and the finishing mill 100. The machine has little abnormal vibration and can obtain relatively high grinding ability.

[0015]

As described above, the pulverizing equipment of the present invention has the following effects. The vertical pulverizer has no separator, so the equipment cost and running cost are low.In addition, the mill has a built-in raw material particle size sorting device to cut fine particles in advance. Stable operation can be continued. Also,
In the raw material particle size sorting device, the side of the air box is panned
Canvas stuck on perforated metal and perforated metal
By entering into the air box
The distribution of the compressed air is very well equalized, resulting in a distribution plate
It is said that the recovery rate of raw material particles falling from around
It has the following features. Since the finishing mill is supplied with a raw material mainly composed of fine powder from which fine powder that can be a final product has been removed in advance, the reduction ratio (reduction rate) is reduced.
io) is small, the pulverization efficiency is improved, and a finer product can be produced. Since a vibrating sieve is not used as in the prior art, the interval between replacement of worn parts is large, the continuous operation period is long, productivity is improved, and maintenance is improved. Classification equipment such as a vibrating sieve is not required between the preliminary pulverization and the finish pulverization, and the equipment cost is low.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing an embodiment of the crushing equipment of the present invention.

FIG. 2 is an overall vertical sectional view of a vertical crusher according to an embodiment of the present invention.

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

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

FIG. 5 is a flow sheet of a conventional pulverizing facility.

[Description of Signs] 1 Vertical grinding machine (conventional) 1A Vertical grinding machine 3A Rotary table 4 Grinding roller 5 Arm 6 Shaft 7 Arm 9 Hydraulic cylinder 13 Rotary separator 14 Annular space passage 15 Casing 16 Discharge port 17 Raw material charging chute REFERENCE SIGNS LIST 30 raw material particle size sorter 32 dispersion plate 34 air box 34 a punching metal 34 b canvas 36 raw material supply port 38 raw material discharge port 39 air duct 40 compressed air supply pipe 42 collecting pipe 44 air chamber 50 raw material hopper 50 a clinker hopper 50 b gypsum hopper 50 A quantitative feeder 50B Constant feeder 52 Constant feedware 60 Stone discharge chute 60a Scraper 70 Belt conveyor 80 Bucket elevator 90 Vibrating sieve 100 Finishing mill 100A Bucket elevator 110 Cyclone separator 10A circulation fan 120 dust collector 130 suction fan

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B02C 1/00-25/00 B07B 1/00-15/00

Claims (1)

(57) [Claims] 1. A crushing apparatus using a vertical crusher as a preliminary crusher, wherein the vertical crusher is provided with a plurality of rotatable crushing rollers on an upper surface of an outer peripheral portion of a rotary table. Is a vertical pulverizer for applying a predetermined pulverizing force to pulverize the raw material between the upper surface of the rotary table and the peripheral surface of the pulverizing roller. The vertical pulverizer is provided above the center of the rotary table and rotates integrally with the rotary table. A dispersion plate of the raw material, an air box provided around the dispersion plate, having a supply port of the raw material to the dispersion plate at the top, and having a plurality of injection ports for injecting compressed air into a side surface; An air duct that is connected to the air box and guides the compressed air containing the fine particles in the feed material to the outside of the system .
And a canvas attached to perforated metal
And a vertical mill having a configuration , a raw material supply facility for supplying raw materials to the vertical mill, the vertical mill, and a finishing mill that receives and grinds the pulverized product of the vertical mill, A pulverizing facility comprising a classifying device for classifying the pulverized product of the finishing mill and a transport system connecting these devices.