JPH07256138A - Crushing equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] This is a crushing facility that mainly crushes raw materials with poor grindability such as cement clinker and blast furnace slag in two stages: preliminary crushing and finish crushing. Provided is a crushing facility having a pre-crusher having a crushing ability. [Structure] Just before the vertical crusher 1A used for the preliminary crusher, a raw material particle size selection device 30 for the raw material is provided to remove fine particles in the raw material in advance, and the resultant is forwarded to the finishing mill 100, and only the coarse particles are vertical crushed. The material is crushed by the machine 1A, the raw material supply equipment (the raw material hopper 50, the constant quantity feeders 50A and 50B), the finishing mill 100, and the classifier (the cyclone separator 110).
And a crushing facility composed of a transportation route connecting these devices.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY 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 such as cement clinker and blast furnace slag that are difficult to crush. The present invention relates to a crushing equipment equipped with a preliminary crusher capable of continuously operating stably with a comparatively high crushing ability while 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 the speed reducer 2 by A to rotate at a low speed, and a plurality of crushing rollers 4 that are driven to rotate by being hydraulically pressed 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 via an arm 5 and an arm 7 which are swingably supported by a casing 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 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 charging 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 rotational direction, and the rotary table 3A
And a rotation slightly 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 combined, and the raw material moves to the outer peripheral portion of the rotary table 3A in a spiral trajectory on the rotary table 3A. Since the roller is pressed against the outer peripheral portion 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, air or hot air or other gas is introduced into 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, whereby the pulverized fine powder is entrained in the gas and the casing 1
5, the blades 13A of the rotary separator 13 located on the upper side receive the classification action, and the product having a predetermined particle size is discharged 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, as is called fine pulverization or ultrafine pulverization. Therefore, it becomes difficult to meet the demand with a single crusher.Therefore, for example, a vertical crusher that does not have a classifier for crushed products as a preliminary crusher before introducing raw materials into a finishing mill such as a ball mill is used. A method has been adopted in which pulverized products of a vertical pulverizer are used for sieving with a vibrating screen and only fine powder is supplied to a finishing mill. FIG. 6 shows a flow sheet in this case. The raw material of the raw material hopper 50 is pulverized by the vertical pulverizer 1 through the constant feedware 52, and the product is guided to the vibrating screen 90 through the bucket elevator 80 and screened. , Fine powder finishing mill (ball mill) 10
0 crushed, oversized products are vertical crusher 1
It is supposed to be crushed in advance.

[0007]

A two-stage crushing system using a combination of preliminary crushing and finish crushing as shown in the flow sheet, and a crushing facility using a vertical crusher without a classifier for crushed products as a preliminary crusher. Has the advantage of being able to grind raw materials with severe grindability, such as cement clinker and blast furnace slag, with higher productivity and lower power consumption per unit than a grinding machine with only a single finishing mill, but on the other hand it is a vertical grinding machine as a preliminary grinding machine. In the case of cement clinker that contains a lot of fine particles, the type crusher not only has a poor crushing efficiency because the raw material is not caught in the crushing roller, but it also causes frequent abnormal vibrations of the mill, which makes it difficult to continue continuous stable operation, causing abnormal vibrations. In some cases, emergency evacuation at the time of supply reduction and productivity deterioration due to suspension of operation were sometimes caused.

[0008]

In order to solve the above problems, in the crushing equipment of the present invention, the raw material is supplied to the vertical crusher in the crushing equipment which uses the vertical crusher as a preliminary crusher. In the raw material supply equipment, a raw material particle size sorting device for selectively removing fine particles from the raw material to be supplied to the vertical crusher, the vertical crusher, a pulverized product of the vertical crusher, and the raw material particle size sorting device. A milling equipment comprising a finishing mill that receives and grinds fine particles after sorting, a classifying device that classifies the milled products of the finishing mill, and a transportation system path that connects each of these devices. The device is provided with a horizontal disk-shaped dispersion plate that receives the feed material and is driven to rotate about a vertical axis by a variable speed electric motor, and a supply port of the raw material to the dispersion plate that is provided around the dispersion plate and is provided around the dispersion plate. Internal compressed air on the side An air box having a plurality of injection ports for injection and is composed of a duct for guiding the compressed air containing fine particles in the feedstock is connected to the air box to the outside of the system.

[0009]

In the crushing equipment of the present invention, in the vertical crusher for performing preliminary crushing, the feed material is preliminarily subjected to particle size selection in advance of the mill, and the fine particles are taken out without being crushed and sent to the finishing mill to remove the fine particles. Only the remaining coarse particles are crushed with a vertical crusher, and the product is sent to the finishing mill.
The pulverization efficiency of the vertical pulverizer is improved, the load on the finishing mill is reduced accordingly, and the pulverization efficiency of the entire pulverizing equipment is increased.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 relate to an embodiment of the present invention,
1 is a flow sheet of a crushing facility, FIG. 2 is an overall vertical cross-sectional view of a raw material particle size sorting device, FIG. 3 is an enlarged vertical cross-sectional view of a main part of a raw material particle size sorting device, and FIG. 4 is an overall vertical cross-sectional view of a vertical crusher. is there. In FIG. 1, 50 is a raw material hopper (50a is a clinker hopper, 50b is a gypsum hopper), 50A and 50B are quantitative feeders for cutting out clinker and gypsum respectively, 30 is a raw material particle size sorting device, 1A is a vertical crusher, and 70 is Belt conveyor, 80 is bucket elevator, 100 is finishing mill (tube mill), 100A is bucket elevator, 110
Is a cyclone separator, 110A is a circulation fan, 12
Reference numeral 0 is a dust collector, and 130 is a suction fan. Finishing mill 1
For 00, a ball mill or a rod mill is usually used, and the cyclone separator 110 is connected in a closed circuit to supply the classified coarse powder again 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 raw material particle size sorting apparatus 30 will be described with reference to FIGS. The raw material particle size sorting apparatus 30 of the present invention is a vertical cylindrical air box 3
A horizontal disk-shaped dispersion plate 32 is disposed on the central axis of the variable speed motor 4, and the variable speed electric motor 32A is installed on the top of the air box 34.
It is hung down by the connecting rod 32a connected to the output shaft of and is rotationally driven. The dispersion plate 3 is provided at one position on the top of the air box 34.
2, a raw material supply port 36 for supplying the raw material is provided, and a coarse grain discharge port 38 is provided in the lower center of the air box 34.
The side surface and the inclined surface at the lower part of the side surface are formed of punching metal (perforated plate) 34a having a large number of holes. The compressed air supplied to the formed air chamber 44 is configured to be injected into the air box 34. Further, an air duct 39 for discharging the compressed air that has been injected is arranged on the outer peripheral portion of the top of the air box 34. The air duct 39 is connected to a cyclone separator and a suction fan (not shown). As described above, the inlets for the compressed air into the air box 34 are a large number of holes in the punching metal 34a used as the side surface and the inclined surface. However, in order to disperse the compressed air into the air box 34, as shown in FIG. It is desirable to attach a canvas (woven cloth) 34b to the inner surface of the punching metal 34a as shown in FIG. The canvas 34b is bolted to the punching metal 34a. The operation of the raw material particle size sorting device 30 configured as described above will be described. The raw material supplied from the raw material supply port 36 drops to the rotating dispersion plate 32, moves spirally to the outer periphery by centrifugal force, then overflows the barrier plate around the dispersion plate 32, and freely falls inside the air box 34. To do. On the other hand, the compressed air supplied to the air chamber 44 via the compressed air supply pipe 40 and the collecting pipe 42 passes through the punching metal 34a and the canvas 34b, enters the inside, and falls within 2 to 3 mm of the supplied raw material. The fine particles ride on this air flow, pass through the inside of the air box 34, and are discharged together with air to the air duct 39. On the other hand, the coarse particles are transferred from the coarse particle outlet 38 to the vertical crusher 1A in the next step. The adjustment of the selection particle size in the raw material particle size selection device 30 is performed by the downstream suction fan 13 connected to the air duct 39.
Adjust the damper to 0 depending on the amount of suction air. That is, as the air volume increases, the particle size of the fine particles discharged to the air duct 39 increases. Further, the air box 34 has a punching metal (perforated plate) 3 having a large number of dispersed holes.
4a, and a canvas (woven fabric) 34b is further formed on this inner surface.
As a result of sticking, the distribution of the compressed air entering the air box 34 is very well equalized, and as a result, the dispersion plate 32 is attached.
The feature is that the recovery rate of raw material fine particles falling from around is extremely high. The rotation speed of the dispersion plate 32 is set to the variable speed electric motor 3
Control at 2A. The rotation speed can be controlled in the range of 20 to 200 rpm and is adjusted according to the amount of raw material supplied. Further, the pressure of the compressed air supplied into the air box 34 is 500 to 30.
The range is set to 00 mmAq, and is adjusted according to the raw material supply amount and the suction air amount.

Next, the structure and operation of the vertical crusher 1A will be described with reference to FIG. The vertical crusher 1A of the present invention is
The rotary separator 13 mounted on the top of the vertical crusher 1 of the conventional structure shown in FIG. 4 is removed, and the rotary table 3A and the rotary table that rotate around the vertical axis via an electric motor and a speed reducer 2 which are not shown. 3A swings through the arm 5 via the arm 5 and the shaft 6 and the hydraulic cylinder 9
The raw material supplied to the rotary table 3A from the raw material charging chute 17 at the center of the upper portion of the casing 15 is pulverized between the rotary table 3A and the pulverizing roller 4 and the rotary table 3A is pressed. It overflows and falls into the annular space passage 14, and the scraper 60
It is scraped by a 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 conveyance to join the air duct 39 of the raw material particle size sorting apparatus 30. , To the cyclone separator 110. As described above, the vertical crusher 1A of the present invention
Has a particle size of 2 to 3 mm or less previously removed, and then falls onto the rotary table 3A and is crushed, so that the biting into the crushing roller 4 is improved, the crushing efficiency is increased, the production amount is improved, and abnormalities occur. Vibration can be prevented.

In the crushing equipment of the present invention, such a vertical crusher 1A is used as a preliminary crusher to remove fine particles in advance from the raw material and feed it to the finishing mill 100 through the cyclone separator 110, and then preliminarily crush the raw material. Then, it is supplied to the finishing mill 100 via the belt conveyor 70 and the bucket elevator 80 to be ground. Finishing mill 100
The crushed product crushed by is the cyclone separator 110.
The powder is adjusted to a required fineness in a closed circuit formed by and is transferred from the cyclone separator 110 to the dust collector 120 to be a product after collection. 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 the required amount of the dust-containing gas out of the cyclone separator 110 to the cyclone separator 110, and the ratio of the circulation air amount to the air emission amount is usually about 80:20.

As described above, in the crushing equipment of the present invention, the raw material particle size sorting apparatus 30 having a simple structure is provided,
As a preliminary crusher, a raw material particle size selection device such as a vibrating screen is not required between the vertical crusher 1A and the finishing mill 100, and the vertical crusher has less abnormal vibration and 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 the raw material particle size sorting device is provided before the mill to cut fine particles beforehand, so there is little abnormal vibration and continuous high crushing capacity is maintained. Stable operation can be continued. Since the finishing mill is supplied with a raw material composed mainly of fine powder from which fine powder that could be the final product is removed in advance, the reduction ratio is small, the pulverization efficiency is improved, and a fine product can be produced. Since a vibrating screen as in the prior art is not used, replacement intervals for worn parts are large, continuous operation periods are long, productivity is improved, and maintainability is improved. The equipment cost is low because no classification equipment such as a vibrating screen is required between the pre-grinding and the finish grinding.

[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 sectional view of a raw material particle size sorting apparatus according to an embodiment of the present invention.

FIG. 3 is an enlarged vertical cross-sectional view of a main part of a raw material particle size sorting apparatus according to an embodiment of the present invention.

FIG. 4 is an overall vertical sectional view of a vertical crusher according to an embodiment of 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 Grinding Machine (Conventional) 1A Vertical Grinding Machine 3A Rotating 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 Input Chute 30 Raw Material Particle Size Sorting Device 32 Dispersion plate 32a Connecting rod 32A Variable speed motor 34 Air box 34a Punching metal 34b Canvas 36 Raw material supply port 38 Coarse grain discharge port 39 Air duct 40 Compressed air supply pipe 42 Collecting pipe 44 Air chamber 50 Raw material hopper 50a Clinker hopper 50b Gypsum hopper 50A Quantitative feeder 50B Quantitative feeder 52 Constant feedware 60 Exhaust stone chute 60a Scraper 70 Belt conveyor 80 Bucket elevator 90 Vibrating screen 100 Finishing mill 100A Bucket elevator 110 Sai Clon separator 110A Circulation fan 120 Dust collector 130 Suction fan

Claims (1)

[Claims] 1. In a crushing facility that uses a vertical crusher as a preliminary crusher, a raw material supply facility that supplies a raw material to the vertical crusher and fine particles selected from raw materials to be supplied to the vertical crusher. A raw material particle size selecting device, the vertical crusher, and a finishing mill that receives and crushes the pulverized product of the vertical crusher and the fine particles after selection in the raw material particle size selecting device,
A crushing equipment comprising a classifying device for classifying crushed products of the finishing mill and a transportation system path connecting these respective devices, wherein the raw material particle size selecting device receives a feed material and rotates around a vertical axis by a variable speed electric motor. A horizontal disk-shaped dispersion plate that is driven to rotate, and a plurality of injection ports that are provided around the dispersion plate and that have a supply port for the raw material to the dispersion plate at the top and that inject compressed air inside And an air duct connected to the air box for guiding the compressed air containing fine particles in the feed material to the outside of the system.