JPH078819A - Pulverizing equipment - Google Patents

Abstract

PURPOSE:To provide pulverizing equipment where there is little abnormal vibration and which is equipped with a preliminary pulverizer having relatively high pulverizing capacity in pulverizing equipment for giving two-stage pulverization of the preliminary one and the finish one to a raw material hard to pulverize, mainly such as cement clinker and blast furnace slag CONSTITUTION:A vertical pulverizer 1A used as a preliminary pulverizer has small diameter pulverizing rollers whose average diameter is 0.4-0.8, being the conventional standard value, and has a turntable whose revolution is 1.1-2.0 being the conventional standard value. Pulverizing equipment consists of the vertical pulverizer 1A, raw material supplying equipment 30, 32, 40, 40A, 42, a finish mill 100, a classifier 10 and a conveying path for connecting the above equipment.

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. Mainly hard materials that are hard to crush, mainly cement clinker and blast furnace slag. The present invention relates to a crushing facility equipped with a preliminary crusher capable of continuously operating stably with a comparatively high crushing ability by suppressing abnormal vibration.

[0002]

2. Description of the Related Art As a kind of crusher for finely crushing chemicals such as limestone, blast furnace slag, and cement raw material into powder, as shown in FIG. 4, a vertical crusher equipped with a rotary table and crushing rollers. 1 is widely used. This type of crusher has a motor 2 at the bottom of the cylindrical casing 15.
A disk-shaped rotary table 3A driven by a speed reducer 2 by A to rotate at a low speed, and a plurality of crushing rollers 4 which are driven to rotate by being pressed by hydraulic pressure or the like at locations equally dividing the outer peripheral portion of the upper surface thereof in the circumferential direction. Is equipped with.

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, gas such as air or hot air is guided to the base of the casing 15 by a duct,
This gas is blown 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
Blades 1 of the separator 13 located in the upper part
The product having a predetermined particle size is discharged by the 3A from the discharge port 16 together with the gas 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. For this reason, for example, a vertical crusher without a classifier is used as a preliminary crusher before the raw material is put into a finishing mill such as a ball mill. A method has been adopted in which pulverized products of a vertical pulverizer are sieved with a vibrating screen and only fine powder is supplied to a finishing mill. FIG. 5 shows a flow sheet in this case. The raw material of the raw material hopper 30 is a constant feed wear 40.
After that, the product is pulverized by the vertical pulverizer 1, the product is guided to the vibrating screen 90 through the bucket elevator 80 and screened, and only the fine powder is pulverized by the finishing mill (ball mill) 100, and the oversized product is re-vertical. Preliminary crushing is performed by the crusher 1.

[0007]

The crushing equipment using a vertical crusher without a classifier as a preliminary crusher by the two-stage crushing by the combination of the preliminary crushing and the finish crushing shown in the flow sheet as described above.・ Compared to crushing equipment with only a finishing mill, crushers and blast furnace slag, which have severe grindability, have the advantage that they can be crushed with higher productivity and lower power consumption, but on the other hand, vertical crushing as a preliminary crusher In the machine, it is difficult to continue continuous stable operation due to frequent occurrence of abnormal mill vibrations due to poor biting of raw material into the crushing rollers, which leads to productivity reduction due to emergency evacuation of supply volume reduction and abnormal operation when abnormal vibration occurs. There was an occasion.

[0008]

In order to solve the above problems, in the crushing equipment of the present invention, a vertical crusher is used as a preliminary crusher, and the vertical crusher rotates. A vertical crusher in which a plurality of rotatable crushing rollers are arranged on the upper surface of the outer periphery of the table and a predetermined crushing force is applied to the crushing rollers to crush the raw material between the upper surface of the rotating table and the crushing roller peripheral surface. The crushing roller has an average diameter of 0.4 to 0.4 which is the standard value of the average diameter of the crushing roller which has been conventionally adopted.
A vertical roller with a small diameter roller of 0.8 and a rotary table rotation speed increased to 1.1 to 2.0 times the standard value that was conventionally adopted, and the raw material was fed to the vertical crusher. A raw material supply facility for supplying, a vertical crusher, a finishing mill for receiving and crushing crushed products of the vertical crusher, a classifying device for classifying the crushed products of the finishing mill, and these devices are connected. The crushing equipment consisted of a transportation route.

[0009]

In the crushing equipment of the present invention, in the vertical crusher for performing preliminary crushing, the crushing roller is a small diameter roller, and
Since the rotary table is configured to be accelerated, the synergistic effect of the increase of the raw material drawing force due to the increase of the raw material trapping angle upstream of the crushing roller and the increase of the table speed
Release of raw material after biting into the crushing roller (escaping to the upstream side)
It is possible to reduce the abnormal vibration and increase the crushing force due to the uniform stabilization of the raw material layer thickness.

[0010]

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,
FIG. 1 is a flow sheet of a crushing facility, FIG. 2 is an overall vertical cross-sectional view of a vertical crusher, and FIG. 3 is a comparative explanatory diagram of a raw material biting state into a crushing roller of a conventional example and the present invention. In the figure, 30 is a raw material hopper (clinker), 32 is a raw material hopper (plaster),
40, 40A, 42 are constant feed wear,
1A is a vertical crusher, 70 is a belt conveyor, 80 is a bucket elevator, 90A is an air slide, 100 is a finishing mill, 100A to 100E are air slides, 110 is a cyclone separator, 110A is a pushing fan, 120 is a dust collector, Reference numeral 130 is a suction fan, and 140 is a damper. A ball mill or a rod mill is usually used as the finishing mill 100, and the cyclone separator 110 is connected in a closed circuit to re-feed the classified coarse powder to the inlet side of the finishing mill 100. The fine powder is collected by a dust collector 120 such as a bag filter or an electric dust collector to be a product.

Next, the structure and operation of the vertical crusher 1A will be described with reference to FIGS. The vertical crusher 1A of the present invention is obtained by removing the separator 13 mounted on the top of the vertical crusher 1 of the conventional structure shown in FIG. 4, and is provided around the vertical axis via an unillustrated electric motor and speed reducer 2. The rotary table 3A that rotates, and the crushing roller 4 that swings through the arm 5 via the arm 5 and the shaft 6 and is pressed by the hydraulic cylinder 9 to the rotary table 3A, and the raw material in the upper center of the casing 15 are provided. The raw material supplied from the charging chute 17 onto the rotary table 3A is crushed between the rotary table 3A and the crushing roller 4, overflows the rotary table 3A and drops into the annular space passage 14, and the scraper 6
It is scraped by 0a and is conveyed to the outside of the machine by the belt conveyor 70 via the stone discharging chute 60. In the annular space passage 14, an upward airflow is caused to flow by a duct (not shown), and the fine powder in the raw material and the pulverized fine powder are discharged from the discharge port 16 by air transfer to the cyclone separator 11
Transport to 0.

Crushing roller 4 of vertical crusher 1A of the present invention
Has adopted a small-diameter roller that is smaller than the size of the crushing roller used so far in such a vertical crusher, and has also increased the rotational speed of the rotary table. That is, the average diameter d of the conventional crushing roller is 0.75D for two rollers and 0.6 for three rollers, where D is the diameter of the rotary table 3A.
The 3D and 4 rollers were set to 0.75D, but the average diameter d of the crushing roller of the vertical crusher 1A of the present invention was set to these conventional values of 0.4 to 0.8. On the other hand, the rotation speed N of the rotary table 3A is such that in the vertical crusher used as such a preliminary crusher, the rotation speed N has been N = K / D ^1/2 (K is an experimental constant K = 34). However, the rotation speed N is 1.1 to 2.0 times the conventional value.
And In this way, as shown in FIG. 3, in the case of the present invention (b), as compared with the conventional example (a), the raw material biting angle is smaller than that of the conventional case by increasing the number of rotations of the table by using the small diameter roller. Since θ increases, the biting efficiency increases, and the material once bitten into the crushing roller is less likely to escape to the upstream side of the crushing roller due to the pressing force (compression force) of the crushing roller, and the vertical movement of the crushing roller is reduced. Vibration is reduced. Further, since the table speed is increased, the pulling force Q due to the table speed is increased, the crushing force F which is the resultant force with the roller pressing force P is increased, and the crushing capacity is also improved. Of the reduction ratios of 0.4 to 0.8 of the average diameter d of the crushing roller, the lower limit value shows the limit that the crushing ability will be significantly reduced at a reduction below this value.
The upper limit indicates the limit at which abnormal vibration occurs. Further, also in the range of the table rotation speed N of 1.1 to 2.0, the lower limit shows the capacity limit and the upper limit shows the vibration limit. It is desirable to appropriately select both of these values in consideration of the pulverizability of the raw material and the required capacity of the customer.

In the crushing equipment of the present invention, such a vertical crusher 1A is used as a preliminary crusher to pre-crush the raw material and the raw material discharged by the belt conveyor 70 is the bucket elevator 8
Although it is supplied to the finishing mill 100 by the air slide 90A via 0, the raw material is reduced to the one-part vertical crusher 1A by the distribution damper 90B provided on the way of the transportation system path to form a closed circuit.

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

[0015]

As described above, the crushing equipment of the present invention has the following effects. The vertical crusher does not have a separator, so the equipment cost and running cost are low, and it is possible to continue continuous stable operation with less abnormal vibration and high crushing capacity. The finishing mill is supplied with raw materials mainly composed of fine powder from which fine powder that could be the final product has been removed beforehand.
It has a small eduction ratio, improves crushing efficiency, and enables the production of finer products. Since the vibrating screen used in the prior art is not used, the replacement intervals of worn parts are long, the continuous operation period is long, the productivity is improved, and the maintainability is improved. No classification equipment is required between pre-grinding and finish grinding, and the equipment cost is low.

[Brief description of drawings]

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

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

FIG. 3 is a comparative explanatory view for explaining a state of raw material biting into a crushing roller of a conventional example and 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 crushing facility.

[Explanation of symbols]

1 Vertical Grinder 1A Vertical Grinder 3A Rotary Table 4 Grinding Roller 5 Arm 6 Shaft 7 Arm 9 Hydraulic Cylinder 14 Annular Space Passage 15 Casing 16 Discharge Port 17 Raw Material Input Chute 30 Raw Material Hopper 32 Raw Material Hopper 40 Constant Feed Wear 40A Constant Feed Wear 42 Constant Feed Wear 60 Stone Exhaust Chute 70 Belt Conveyor 80 Bucket Elevator 90 Vibrating Screen 90A Air Slide 90B Distribution Damper 100 Finishing Mill 100A Air Slide 100B Bucket Elevator 100C Air Slide 100D Air Slide 100E Air Slide 110 Cyclone Separator 110A Pushing fan 120 Dust collector 130 Suction fan 140 Damper θ Raw material trapping angle θ _l Raw material trapping angle (standard roller) θ _s Raw material biting angle (small diameter roller) F Crushing force P Roller pressing force (rolling down force) Q Table speed pulling force

Claims (1)

[Claims] 1. A crushing facility using a vertical crusher as a preliminary crusher, wherein the vertical crusher has a plurality of rotatable crushing rollers arranged on an upper surface of an outer peripheral portion of a rotary table. A vertical crusher for crushing raw materials between the upper surface of the rotary table and the peripheral surface of the crushing roller by applying a predetermined crushing force to the crushing roller. The vertical roller is a small diameter roller having a value of 0.4 to 0.8, and the rotational speed of the rotary table is increased to 1.1 to 2.0 times the standard value conventionally used. A raw material supply facility for supplying a raw material to a mold crusher, the vertical crusher, a finishing mill for receiving and crushing the crushed product of the vertical crusher, and a classifying device for classifying the crushed product of the finish mill, A transportation route connecting these devices,
Crushing equipment consisting of