JPH057792A - Crushing equipment - Google Patents

Abstract

PURPOSE:To provide a crushing equipment with a low-cost grain size classification device which can use an upright crushing device for preliminary crushing and a finishing mill for finish-crushing, and further which can be remote- controlled easily during operation to discriminate the grain size of a product obtained as a result of preliminary crushing, and need not replace wearable parts frequently. CONSTITUTION:An uplight crushing device 1, raw material supply equipment which supplies raw material to the uplight crushing device 1, an inertly activated grade classification device 110 and a finishing mill 100 are provided. The fine powder remaining after the grade classification by the inertly activated classification device 110 is conducted to the finishing mill 100. In addition, coarse particles after the grade classification process are returned to the upright crushing device 1 through transport paths 80a, 80b.

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 crusher such as a ball mill, and mainly uses chemicals such as cement clinker, slag, and high-performance ceramics. The present invention relates to a crushing facility for finely crushing products.

[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
A disk-shaped rotary table 3A which is driven by a speed reducer 2 by a motor 2A to rotate at a low speed in a lower portion of the cylindrical casing 15, and is driven to rotate by hydraulically contacting a portion equally dividing the outer peripheral portion of the upper surface thereof in the circumferential direction. And a plurality of crushing rollers 4 for

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 15 by a shaft 6, and by operating the hydraulic cylinder 9, The crushing roller 4 is pressed against 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 raw material layer pressure, 14 is a gas blowing annular space passage around the rotary table 3A, 14A is a gas supply passage, and 13 is raw material crushed by the 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 feeding chute 17 receives the centrifugal force in the radial direction of the rotary table 3A and slides on the rotary table 3A. At times, the rotary table 3A receives a force in the rotation direction, and the rotary table 3A
It slides with A and performs 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 the crushing roller 4 and the rotary table 3A from a direction forming an angle with the roller axial direction and is bitten. It is crushed and crushed.

On the other hand, at the base of the casing 15, gas such as air or hot air is introduced by a duct,
This gas blows up from the annular space portion 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 in the gas and the casing 1
5, the blade 1 of the separator 13 that is located in the upper part
The product having a predetermined particle size is subjected to the classification action by 3A and is discharged together with the gas from the discharge port 16 and sent to the next step.

In recent years, the demand for the product particle size of pulverized raw materials has been increasing year by year, and it has become more and more desired to make the product particle size finer, which is called fine pulverization or ultrafine pulverization. Therefore, it becomes difficult to meet the demand with a single crusher. Therefore, for example, before the raw material is put into a finishing mill such as a ball mill, a vertical crusher is used as a preliminary crusher. A method has been adopted in which pulverized products are sieved with a vibrating screen and only fine powder is supplied to a finishing mill. FIG. 6 shows a flow sheet in this case, in which the raw material of the raw material hopper 60 is pulverized by the vertical pulverizer 1 through the constant feed ware 70, and the product is guided to the vibrating screen 90 through the bucket elevator 80 and screened. Only the fine powder is crushed by the finishing mill (ball mill) 100, and the oversized product is again preliminarily crushed by the vertical crusher 1.

[0007]

In the above-described two-stage crushing by the preliminary crushing and the main crushing, the product of the preliminary crushing is sieved by the vibrating sieve, and the maintenance of the sieve becomes a problem. That is, for example, in the case of a raw material that is particularly abrasive, such as when crushing cement clinker containing slag, it is generally necessary to inspect and replace the vibrating screen every 2 to 3 months. However, it was inevitable to stop the operation for several hours, and the decrease in productivity due to the operation stop was unavoidable. In addition, it was difficult for the vibrating sieve to easily change the sieving / classifying point of the vibrating sieve according to the change of the raw material type and the change of the properties of the supplied raw material (grindability, water content).

[0008]

In order to solve the above-mentioned problems, the crushing equipment of the present invention is a crushing equipment using a vertical crusher as a preliminary crusher. It is equipped with a raw material supply facility for supplying raw materials, a vertical crusher, a classifying device for crushed products of the vertical crusher, a finishing mill for crushing fine particles after classification, and a transportation device. An inertial utilization-type classification device having a belt conveyor for transporting pulverized products driven by a and a classification chamber having a plurality of compartments formed therein in the traveling direction of the belt conveyor,
In addition, the pulverization equipment was provided with a transportation system for introducing fine powders of the pulverized products of the classifier to the finishing mill and returning coarse particles to the vertical pulverizer.

[0009]

In the crushing equipment of the present invention, an inertia-utilizing type classifier is provided between a vertical crusher as a preliminary crusher and a finishing mill, and the preliminary crushed product on a variable speed belt conveyor is classified as described above. Fine particles and coarse particles are classified by the above, and only the fine particles are guided to the finishing mill, and the coarse particles are recycled to the preliminary crusher, and the classification point of this inertial utilization type classifier is adjusted by the rotation speed of the belt conveyor. It can be easily implemented while driving by remote control because it is only changed.

[0010]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 4 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 section showing another embodiment of an inertial utilization type classifier (hereinafter referred to as inertial classifier). Fig. 3 is a vertical sectional view showing another embodiment of the inertial classifying device using a table feeder in place of the belt feeder, and Fig. 4 is a track diagram of particles horizontally discharged into the air. .6 shows the case where sand particles having a particle size of 0.15 to 1 mm are discharged at an initial velocity of 15 m / sec. As can be seen from Fig. 4, the track varies depending on the particle size depending on the air resistance, and the coarser particles reach farther. The inertia classifier is a type of gravity classifier that applies this principle. As the initial velocity increases, the tracks move to the right in the figure, so the classification point can be adjusted by the speed of the belt conveyor. Sh and Sv in the figure indicate the horizontal distance and the vertical distance (m), respectively, and Dp indicates the particle diameter (mm).
Indicates. In this type of classifier, it is important to improve the dispersion of particles, and if the supply amount is too large, the particles collide with each other and the accuracy of classification deteriorates.

In FIGS. 1 and 2, 60 is a raw material hopper,
70 is constant feed wear, 80a, 80b
Is a bucket elevator, 100 is a finishing mill, 110 is an inertial classifying device, 110a is a belt conveyor, 110b is a variable speed electric motor, 120 is a dust collector, and 130 is a suction fan. Further, 110 m in FIG. 3 is a table feeder, and 110 n is a variable speed electric motor. The vertical crusher 1 is as described in the related art, and the finishing mill 100 uses a ball mill or a rod mill. As the dust collector 120, a bag filter, a cyclone, or an electric dust collector can be used. Further, a classifying device (not shown), for example, a cyclone separator is used downstream of the finishing mill 100, and a closed circuit system is adopted in which coarse powder after classification is returned to the finishing mill.

The operation of the crushing equipment of the present invention constructed as described above will be explained. The crushing raw material is cut out from the hopper 60 by the constant feed ware 70, preliminarily crushed by the vertical crusher 1, and the fine powder is collected. The coarse particles are discharged from the lower annular space passage 14 while being directed to the dust device 120, and are guided to the inertial classification device 110. Then, the particles are discharged horizontally to the classification chamber by the high-speed belt conveyor 110a, and the fine particles are discharged from the front compartment, and the coarse particles are discharged from the far compartment.
And, the product granules and powder are bucket elevator 80b.
The powder is entered into the finishing mill 100 via the and pulverized. On the other hand, the coarse particles of the product are returned to the vertical crusher 1 by a transportation means such as a bucket elevator 80a. The fine powder product of the vertical crusher 1 collected by the dust collector 120 may be used as it is as a final product depending on the particle size, but when it does not reach the desired particle size, it is guided to the finishing mill 100.

Instead of the inertial classifying device 110 using the belt conveyor 110a shown in FIGS. 1 and 2, an inertial classifying device 110 using a table feeder 110m shown in FIG. 3 may be used. In any case, when the inertial classifier 110 is used, it is easy to change the classification point, and it is not necessary to replace parts in a short cycle (2 to 3 months) when using a vibrating sieve, and maintainability is improved. Is significantly improved. The inertial classifier generally has a drawback that the classification point is not sharper than that of a vibrating screen. However, the function of the inertial classifier 110 in the crushing equipment of the present invention is not a strict method of particle size selection of the final product, but a preliminary crushed product. Since the selection is for supply to the main crushing, the above-mentioned disadvantages do not become apparent.
It is durable enough to use.

Since the dust generated at the entrance of the belt conveyor 110a is collected, it is preferable to connect the pipe to the dust collector 120 to extract air.

[0015]

As described above, in the crushing equipment of the present invention, since the inertial classifying device (inertial utilizing type classifying device) is used for the selection of the crushed products after the preliminary crushing, the life of parts replacement is long, Moreover, not only can the classification points be changed remotely and easily during operation, but also the equipment costs are low and the power costs can be reduced. In addition, since the diameter of the ball, which is the grinding medium in the first chamber of the finishing mill, can be reduced, the performance of the finishing ball mill is improved,
Running costs can be reduced.

[Brief description of drawings]

FIG. 1 is a flow sheet showing an example of a crushing facility of the present invention.

FIG. 2 is a vertical cross-sectional view showing another embodiment of the inertial utilization type classification device used in the crushing equipment of the present invention.

FIG. 3 is a vertical cross-sectional view showing another embodiment of the inertial utilization type classification device used in the crushing equipment of the present invention.

FIG. 4 is a particle track diagram of the inertial utilization type classification device according to the present invention.

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

FIG. 6 is a flow sheet of a conventional crushing facility.

[Explanation of symbols]

 1 Vertical crusher 60 Raw material hopper 70 Constant feed ware 80 Bucket elevator 80a Bucket elevator 80b Bucket elevator 90 Vibrating sieve 100 Finishing mill 110 Inertia classifier 110a Belt conveyor 110b Variable speed electric motor 110m Variable speed electric motor 120 Collection Dust device 130 Suction fan

Claims (1)

Claim: What is claimed is: 1. A crushing facility using a vertical crusher as a preliminary crusher, comprising a raw material supply facility for supplying raw materials to the vertical crusher, a vertical crusher and the vertical crusher. The crusher is provided with a classifying device for crushed products, a finishing mill for crushing fine particles after classification, and a transporting device, and the classifying device is a belt conveyor for transporting crushed products driven at high speed by a variable speed motor and the inside of the belt. An inertial utilization type classifier having a plurality of classifying chambers formed in the conveyor traveling direction, wherein fine particles of a crushed product of the classifying apparatus are introduced to the finishing mill to form coarse particles into the vertical crusher. Crushing equipment with a transportation route to return to.