JP2755338B2 - Crushing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The crushing equipment of the present invention uses a vertical crusher as a preliminary crusher for a finishing mill such as a ball mill, and is particularly hard, such as cement clinker and blast furnace slag, which is hard to crush. In addition, the present invention relates to a crushing apparatus for finely crushing a material having high abrasion.

[0002]

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

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 on a casing 15 by a shaft 6 so that the crushing roller 4 is actuated. 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 for adjusting the layer pressure of the raw material, 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. When a force in the rotating direction is received by the rotating table 3A,
A slides with A and makes a rotation somewhat slower than the rotation speed of the turntable 3A. The above two forces, that is, the force in the radial direction and the force in the rotational direction are synthesized, and the raw material is
A moves to the outer periphery of the turntable 3A in a spiral locus on A. Since a roller is pressed against this outer peripheral portion and rotated, 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 is caught. 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 14 between the outer peripheral surface of the turntable 3A and the inner peripheral surface of the casing, so that the pulverized fine powder accompanies the gas and the casing 1
5, the blades 1 of the separator 13 located above.
The product having the predetermined particle size is subjected to the classification action by 3A, and is discharged together with the gas from the outlet 16 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 more and more desired as referred to as fine pulverization or ultra-fine pulverization. Therefore, it is difficult to meet the demand with a single crusher. For this reason, for example, a vertical crusher is used as a preliminary crusher before charging the raw materials into a finishing mill such as a ball mill. A method has been adopted in which a crushed product is sieved with a vibrating sieve and only fine powder is supplied to a finishing mill. FIG. 4 shows a flow sheet in this case. The raw material of the raw material hopper 60 is pulverized by the vertical pulverizer 1 through the constant feedware 70, and the product is guided to the vibrating sieve 90 via the bucket elevator 80 for screening. Only the fine powder is pulverized by a finishing mill (ball mill) 100, and the oversized product is again pre-pulverized by the vertical pulverizer 1.

[0007]

In the above-described two-stage pulverization by pre-pulverization and main pulverization, the pre-pulverized product is sieved with a vibrating sieve, and maintenance of the sieve becomes a problem. That is, for example, when the raw material is particularly abrasive, such as when finely pulverizing a cement clinker containing slag, it is generally necessary to inspect the vibrating sieve and replace parts every two to three months. Had to be shut down for several hours, which inevitably led to a drop in productivity due to downtime. Also, it is difficult to change the sieving classification point of the vibrating sieve easily and easily in accordance with the change of the type of raw material or the change of the properties of the raw material to be supplied (grindability, water content) with the vibrating sieve.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a crushing apparatus of the present invention is a crushing apparatus using a vertical crusher as a preliminary crusher. with raw material supply equipment and vertical transport devices and finishing mill grinding classification apparatus and classification after particle grinder and該竪pulverizer grinding product to supply the raw material, the該分classifier vertical column-like crude
At the upper end, a cylinder for collecting and sorting medium and a cylinder for collecting and sorting medium
With the two sets of configuration through it of the both cylinder
A coarse air classification is performed by forming an upward air flow from below.
An ascending type classification device for freely falling and classifying a raw material from above a collecting cylinder , and a cylinder for collecting and separating the coarse particles.
The coarse particles after the classification in the above step are returned to the vertical grinder to re-pulverize, and the classified medium particles in the cylinder for collecting and separating the medium particles are weighted.
A grinding facility having a transport route leading to the finishing mill by free fall by force was used.

[0009]

The crushing equipment of the present invention is provided with an upflow type classification device between a vertical crusher as a preliminary crusher and a finishing mill,
A rising flow is formed in a vertical tower-shaped cylinder, the rising speed is set arbitrarily, the pulverized products of a vertical pulverizer used for classification fall from the upper part, and the final sedimentation speed varies depending on the particle diameter. Then, particles having a particle diameter larger than the classification point are dropped downward, and particles below the classification point are raised and discharged from a discharge port provided above. In this way, the fine particles after classification are guided to a finishing mill for finish pulverization, and the coarse particles after classification are returned to a vertical pulverizer and reground. The control of the classification point of the upflow type classification device can be adjusted by the flow rate guided to the cylindrical body, that is, the rising speed, so that it can be arbitrarily changed during operation by remote control and is simple.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 relate to an embodiment of the crushing equipment of the present invention, FIG. 1 is a flow sheet of the crushing equipment, and FIG. 2 is a longitudinal sectional view of an upflow type classification device. In the figure, 60 is a raw material hopper, 70 is a constant feed ware, 1 is a vertical crusher, 80 is a bucket elevator, 110 is an upflow classifier, 100 is a finishing mill, 120 is a dust collector,
130 is a suction fan. The vertical crusher 1 is as described in the prior art.
00 uses a ball mill or a rod mill. Dust collector 1
20 is a bag filter, a cyclone, or an electric dust collector.

As shown in FIG. 2, an upflow type classification device 11
0 denotes two adjacent cylinders (primary classification chamber) 110a and cylinders (secondary classification chamber) 11b formed from a vertical cylindrical cylinder.
Communicates with the upper part, and the respective cylinders 110a, 110b
Are provided with air intakes from below. A discharge port for dust-containing gas is provided at one upper end of the cylinder 110b, and a discharge port for powdery particles is provided at the lower center of the cylinders 110a and 110b. By supplying the air volume such that the flow velocity v ₁ of the large rising flow than increasing the flow velocity v ₂ of the cylindrical body 110b is a secondary classification chamber the tubular member 110a is a primary classification chamber, primary Classification room cylinder 110a
Coarse particles fall on the cylinder 110b, medium particles fall on the cylinder 110b of the secondary classification chamber, and the terminal sedimentation velocity is v ₂ (m / sec).
c) The following fine particles are guided to the dust collecting device 120 along with the fluid from the dust-containing gas outlet. 110c and 110d are cylinders 1
A push-in fan to 10a and a flow control valve are provided. Similarly, 110e and 110f are a push-in fan to the cylinder 110b and a flow control valve.

In the pulverizing equipment of the present invention configured as described above, the raw material of the raw material hopper 60 is supplied to the vertical pulverizer 1 as a preliminary pulverizer through the constant feedware 70 and pulverized. The fine powder is guided to the dust collector 120, and the coarse particles are collected in the annular space passage 1 of the vertical mill 1.
4 and is introduced into the upflow classifier 110 via the bucket elevator 80. Then, as described above, the coarse particles after classification are returned to the vertical pulverizer 1 and re-pulverized.
The fine particles are directed to the dust collector 120, and the medium particles (intermediate particles) are introduced into the finishing mill 100 and pulverized by the finishing mill 100. In addition, a cyclone separator (not shown) is provided downstream of the finishing mill 100, and the fine powder after the cyclone separator classification becomes a final product, and a coarse circuit coarser than the classification point is returned to the finishing mill 100 to form a closed circuit (closed circuit). It is configured to be. In FIG. 1, the powder collected by the dust collecting device 120 can be used as a final product as it is, but may be returned to the finishing mill 100 if the desired particle size has not yet been reached.

[0013] In the upflow type classification device employed in the pulverizing equipment of the present invention, the classification point is very sharp because the classification principle is to separate the particles by the difference in terminal sedimentation velocity which differs for each particle size. However, for that purpose, it is necessary that the supply of particles is not excessive, and that the particles are uniformly dispersed inside the cylinder, and the particle concentration in each part of the cylinder is small enough to allow free sedimentation and sedimentation. However, the ascending flow classifier 110 does not regulate the classification point of the final product, and does not supply only the coarse particles among the pulverized products after the preliminary pulverization to the finishing mill 100. Since it is not necessary, it can be said that it is an inexpensive apparatus that sufficiently matches the requirement of the crushing equipment of the present invention. In addition, when it is desired to change the classification point of the fine particles supplied to the finishing mill 100 in accordance with the change of the raw material or the change of the crushing property of the supplied raw material, it is only necessary to change the air volume. is there.

[0014]

As described above, in the crushing equipment of the present invention, the upflow type classification device for selecting the crushed product after the preliminary crushing is employed, so that there is almost no wear in the equipment.
As in the case of using a vibrating sieve, short-term inspection and replacement of parts every two to three months and a factor that impairs productivity associated therewith are eliminated, thereby significantly improving maintainability and driving operability. In addition, the equipment cost is low, and the diameter of the steel ball, which is the grinding medium in the first chamber of the finishing mill, can be reduced, so that the grinding efficiency can be improved and the running cost can be reduced.

[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 a longitudinal sectional view showing an embodiment of an upflow type classification device employed in the crushing equipment of the present invention.

FIG. 3 is an overall vertical sectional view of a conventional vertical crusher.

FIG. 4 is a flow sheet of a conventional crushing equipment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical grinder 60 Raw material hopper 70 Constant feed wear 80 Bucket elevator 90 Vibrating sieve 100 Finishing mill 110 Upflow type classification device 110a Cylindrical body 110b Cylindrical body 110c Push-in fan 110d Flow control valve 110e Push-in fan 110f Flow control valve 120 Collection Dust device 130 Suction fan

Claims (1)

(57) [Claims] 1. A crushing equipment using a vertical crusher as a preliminary crusher, comprising a raw material supply equipment for supplying raw materials to the vertical crusher, a vertical crusher, and a crushed product of the vertical crusher. A classifier, a finishing mill for crushing the classified particles , and a transport device are provided. The classifier is a vertical tower-shaped cylinder for coarse particle classification and collection.
A two-pack configuration in which a cylinder for particle classification and collection is communicated at the upper end
And an ascending flow classifier that forms an airflow of an ascending flow from below to each of the two cylinders and freely falls and classifies the raw material from above the cylinder for coarse-grain classification and collection ,
In addition, the coarse particles after classification in the cylinder for coarse-grain classification and recovery are returned to the vertical grinder and crushed again, and the cylinder for medium- grain classification and collection is recovered.
A pulverizing facility having a transport route for guiding the medium- sized particles in the body to the finishing mill by free fall due to gravity .