JPH05285410A - Grinder - Google Patents

Abstract

PURPOSE:To drastically enhance operation efficiency and to enhance the production capacity of the whole crusher body by constituting a sorting machine of a casing, a takeout hopper of coarse powder and middle powder, a charging chute and a movable damper which is arranged in the boundary part and tiltable in the flow direction of classification air. CONSTITUTION:A sorting machine 39 is equipped with a casing 40, a takeout hopper 15 of coarse powder and a takeout hopper 46 of middle powder respectively described below. The casing 40 is provided with an air introducing port 42 in one side and an air discharge port 43 in the other side so that the flow of classification air 41 flowing in the transverse direction is formed in the inside. The takeout hopper 45 of coarse powder and the takeout hopper 46 of middle powder are provided side by side in order toward an air discharge port 43 side from an air intoroduciton port 42 side in the lower part of the casing 40. A charging chute 50 is provided in the upper part of the casing 40 so that the ground material 5 supplied from a preliminary grinder falls and is supplied on the takeout hopper 45 near to the boundary part 53 of both hoppers 45, 46 while holding the necessary classification space. A movable damper 54 tiltable in the flow direction of a classification air 41 is provided in the boundary part 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushing device used for cement production.

[0002]

2. Description of the Related Art In recent years, as a pre-stage of the crushing process by the fine crusher having excellent fine crushing performance, a two-stage crushing system crushing device has been developed in which a preliminary crusher having a high crushing ability is used to roughly crush raw materials. It is being advanced.

FIG. 5 shows an example of the above crushing device.
Raw material 2 from raw material hopper 1 is introduced into roller mill 4 (preliminary crusher) through belt feeder 3 to perform coarse crushing,
The coarsely crushed pulverized product 5 is applied to a sorting machine 8 via a feeder 6 and a bucket elevator 7, etc., and the coarse powder 9 sorted by the sorting machine 8 is returned to the roller mill 4 again and sorted by the sorting machine 8. Ball mill 13
It is introduced into (main crusher) to be finely crushed, and the crushed product 5 ′ finely crushed by the ball mill 13 is guided to a classifier 16 via a bucket elevator 14 and an air slide 15, and the classifier The fine powder (fine powder) 17 and the fine powder 18 are classified by 16 and the fine powder 18 is returned to the ball mill 13 through an air slide 19 and the fine powder 17 is taken out as a product through an air slide 37. It is like this.

The fine powder 30 floating in the roller mill 4 and the sorter 8 is sucked and discharged by the suction fan 10, collected by the bag filter 12, and introduced into the ball mill 13.

Further, fine powder 3 floating in the ball mill 13
0'is sucked and discharged by the suction fan 31 and the cyclone 3
The fine powder 17 in the fine powder 30 ′ classified in step 2 is sucked by the bag fan 33 and collected by the bag filter 34, and the fine powder 30 ′ remaining after separating the fine powder 17 is as described above. It leads to the bucket elevator 14.

The classifying air 35 of the classifier 16 is circulated by a circulation fan 36. A part of the classifying air 35 is guided to the bag filter 34 so that the classifying air 35 is entrained in the classifying air 35. The flowing fine powder 17 is collected.

In the crushing apparatus as described above, conventionally,
A multi-stage sieve was used as the sorter 8.

An example of the multi-stage screen will be described below with reference to FIG.

A vibration container 21 is mounted on a pedestal 20 and an anti-vibration support 22 is provided.
Further, the vibration container 21 is supported so as to absorb vibrations, and the vibrating container 21 has screens 24a to 24e having different sieve mesh sizes in a plurality of stages (five stages) from the upper stage to the lower stage. It is arranged so as to be inclined so that the size of the sieve mesh becomes smaller, and further, a vibration generator (for example, a eurus motor device for causing vibration by rotating an eccentric wheel) 25 on the lower side of the vibration container 21. Is attached, and the vibration container 21 is vibrated by the vibration generator 25. In the figure, 26 is a crushed material input port, 27 is a crushed material collision plate, 28 is a medium powder extraction chute, and 29 is a coarse powder extraction chute.

Ground material 5 from roller mill 4 (see FIG. 5)
At the time of sieving, the screens 24a to 24e are vibrated integrally with the vibrating container by the vibration generator 25, and then the pulverized material 5 from the roller mill 4 is fed from the pulverized material input port 26.
Then, the pulverized material 5 collides with the pulverized material collision plate 27 and is dispersed, and is multi-stage sieved by the screen 24a of the first stage (uppermost stage), and the pulverized material 5 (which does not pass through the sieve mesh of the screen 24a) The coarse powder falls from the lower inclined end of the screen 24a and reaches the coarse powder take-out chute 29. On the other hand, the crushed material 5 that has passed through the sieve mesh of the first-stage screen 24a and dropped to the second-stage screen 24b is the same as the case of the first-stage screen 24a by the second-stage screen 24b. Multi-stage screened. In this way, the first screen (a) with the largest (coarse) screen 24a to the fifth (the lowest) screen 24e with a smallest (fine) screen is screened, The powder 11 is from the medium powder extraction chute 28, and the coarse powder 9 is the coarse powder extraction chute 29.
Are taken out from each.

[0011]

However, in the multistage sieve, the abrasion of the screens 24a to 24e progresses rapidly,
Since the screens 24a to 24e are frequently maintained, there has been a problem that the operation of the crusher must be stopped each time the maintenance is performed, which impedes continuous operation.

Further, the multi-stage sieve has a drawback that it has a low processing capacity, and there is a problem that the production capacity of the entire pulverizer is restricted by the processing capacity of the multi-stage sieve.

Further, in the above-mentioned multi-stage sieve, the limit of the divided particle size is as large as about 2 mm, and it has not been possible to set the divided particle size smaller than this.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a crusher equipped with a sorting machine that can solve all the problems described above.

[0015]

According to the present invention, a crushed product roughly crushed by a preliminary crusher is sorted into a coarse powder and an intermediate powder by a sorter, and the sorted coarse powder is fed to the preliminary crusher. In a pulverizer that returns and re-pulverizes, and introduces the selected intermediate powder into the main pulverizer to finely pulverize, in the pulverizer, a flow of classification air that flows laterally inside is formed. A casing having an air inlet on one side and an air outlet on the other side, and a coarse powder extracting hopper and a medium powder extracting hopper arranged in parallel at the lower part of the casing from the air introducing port side toward the air exhaust port side. , A charging chute arranged on the upper part of the casing so that the pulverized material from the preliminary pulverizer is dropped and supplied across the required classification space onto the coarse powder extraction hopper near the boundary between the two hoppers, and the boundary. Tilts in the direction of classification air flow It is characterized in that constructed in accordance with the capacity movable damper.

[0016]

Therefore, according to the present invention, air is introduced from the air introduction port to form a flow of classified air flowing in the lateral direction in the casing, and the crushed material coarsely crushed by the preliminary crusher is supplied to the upper part of the charging chute. Then, the pulverized product falls into the casing so as to intersect with the flow of the classification air, and while falling in the classification space between the charging chute and the boundary, the pulverized product has a particle size of not more than the intermediate powder. The body is carried to the downstream side along with the flow of the classification air, and only the coarse powder having a large weight that cannot ride on the flow of the classification air is dropped by the coarse powder into the hopper to be separated and returned to the roller mill.

On the other hand, among the granular materials carried to the downstream side, the intermediate powder having a relatively large particle size falls due to gravity while moving above the intermediate powder extraction hopper and is collected in the intermediate powder extraction hopper, and is then stored in the ball mill. be introduced.

The remaining granular material from which the coarse powder and the intermediate powder have been separated is discharged from the air exhaust port to the outside while being suspended in the classification air, and recovered after passing through the classifier and the like.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention, in which the same reference numerals as in FIG. 5 represent the same parts.

In the crushing device 38 having substantially the same structure as that of the crushing device shown in FIG. 5, a conventional multistage sieve is used between the roller mill 4 (preliminary crusher) and the ball mill 13 (main crusher). An air classification type sorting machine 39 as shown in FIG. 1 and FIG. 2 is provided.

It should be noted that instead of the conventional multistage sieve, the sorting machine 39
Since the configuration other than the above is similar to that of the crushing device of FIG. 5, the description thereof is omitted.

The sorting machine 39 will be described in detail below.

Reference numeral 40 in the drawing denotes a casing of the sorter 39, and the casing 40 has one side (the left side in FIG. 1) so that a flow of classification air 41 flowing in the lateral direction (left and right direction in FIG. 1) is formed therein. ) Has an air inlet 42 on the other side (on the right side in FIG. 1), and the air outlet 43 is connected to the classifier 16 via a suction fan 44.

Further, in the lower part of the casing 40, a coarse powder extraction hopper 45 and a medium powder extraction hopper 46 are arranged in parallel in this order from the air introduction port 42 side toward the air exhaust port 43 side. Airlock dampers 47, 4 with double flaps that open and close alternately at the lower ends of
8 is provided for each of the roller mill 4 and the coarse powder 9 discharged from the air lock damper 47 of the coarse powder extraction hopper 45.
Powder 1 returned to the factory and discharged from the powder hopper 46
1 is introduced into the ball mill 13.

In the upper part of the casing 40, a crushed material 5 from the roller mill 4 is provided with a required classification space 49 on the coarse powder extraction hopper 45 near the boundary between the coarse powder extraction hopper 45 and the intermediate powder extraction hopper 46. An injecting chute 50 that is inclined so as to be dropped and supplied is provided.

As shown in FIG. 2, the charging chute 50 is formed in a downward diverging shape and has a sliding surface 51.
Inverted V-shaped dispersion plates 52 are attached in a zigzag manner, and while the pulverized material 5 supplied from above slides down in the charging chute 50, it is even in the front-back direction of the casing 40 (left-right direction in FIG. 2). It is supposed to be distributed in.

A movable damper 54 which is tiltable in the flow direction of the classification air 41 is disposed at the boundary 53 between the coarse powder extraction hopper 45 and the intermediate powder extraction hopper 46.
The divided particle size can be adjusted by adjusting the tilting position of the movable damper 54.

Then, by driving the suction fan 44, air is sucked from the air inlet 42 to form a flow of the classified air 41 flowing in the casing 40 in the lateral direction,
When the crushed material 5 roughly crushed by the roller mill 4 is supplied to the upper part of the charging chute 50, the crushed material 5 is evenly distributed in the front-rear direction of the casing 40 by the dispersion plate 52 while sliding on the sliding surface 51 of the charging chute 50. And falls into the casing 40 so as to intersect the flow of the classification air 41, and the classification space 4 between the charging chute 50 and the boundary portion 53
At 9, the powder particles having a particle size of 11 or less in the pulverized material 5 are carried along the flow of the classification air 41 to the downstream side (right side in FIG. 1) and are not carried in the flow of the classification air 41. Only the coarse powder 9 having a large size falls by gravity into the coarse powder extraction hopper 45, is separated, is discharged from the air lock damper 47, and is returned to the roller mill 4.

On the other hand, among the powder particles carried to the downstream side, the intermediate powder 11 having a relatively large particle size is dropped by gravity while moving above the intermediate powder extraction hopper 46, and is recovered by the intermediate powder extraction hopper 46. , Is discharged from the air lock damper 48 and introduced into the ball mill 13.

The remaining granular material from which the coarse powder 9 and the intermediate powder 11 are separated is guided to the classifier 16 from the air exhaust port 43 while being suspended in the classifying air 41, and the classifier 16 is used. The fine powder 18 and the fine powder 17 are classified, the fine powder 18 is introduced into the ball mill 13 and finely pulverized, and the fine powder 17 is recovered as a product.

Therefore, according to the above-mentioned embodiment, since a screen having a high maintenance frequency unlike the conventional multi-stage sieve is not used, the frequency of stopping the operation of the crushing device 38 for the maintenance work of the sorting machine 39 is remarkably reduced. Therefore, the operation efficiency can be significantly improved.

Further, as compared with the conventional case where the pulverized material 5 is sieved by multistage sieving, the processing capacity of the sorter 39 can be greatly improved, so that the production capacity of the pulverizer 38 is improved as compared with the conventional case. be able to.

Further, in the conventional multi-stage sieve, it was not possible to set the dividing point to a particle size of 2 mm or less due to the limitation of the screen mesh of the screen, but by adopting the air classifying sorter 39. It is possible to set the dividing point to a particle size of 2 mm or less as necessary.

FIG. 4 shows another embodiment of the present invention.
This is an example in which the air exhaust port 43 of the sorter is connected to the cyclone 32 via the suction fan 44, and in the case of this embodiment as well, the same effects as those of the embodiments of FIGS. 1 to 3 described above can be obtained.

The crushing apparatus of the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0037]

As described above, according to the crushing device of the present invention, various excellent effects as described below can be obtained.

(I) Since a screen with high maintenance frequency unlike the conventional multi-stage sieve is not used, the frequency of stopping the operation of the crushing device for the maintenance work of the sorting machine is remarkably reduced, and the operation efficiency is greatly improved. Can be improved.

(II) Since the processing capacity of the sorting machine can be greatly improved as compared with the conventional case where the pulverized material is sieved by multistage sieving, the production capacity of the entire pulverizing apparatus can be improved as compared with the conventional case. You can

(III) In the conventional multi-stage sieve, it was not possible to set the dividing point to a particle size of 2 mm or less due to the limitation of the screen mesh of the screen, but by using the air classification type sorting machine, It is possible to set the dividing point to a particle size of 2 mm or less as necessary.

[Brief description of drawings]

FIG. 1 is a sectional view of a sorting machine according to an embodiment of the present invention.

FIG. 2 is a view taken along line II-II in FIG.

FIG. 3 is a system diagram of an embodiment of the present invention.

FIG. 4 is a system diagram showing another embodiment of the present invention.

FIG. 5 is a schematic view of a conventional crushing device.

FIG. 6 is a side view showing an example of a multi-stage sieve which is the sorting machine of FIG.

[Explanation of symbols]

 4 Roller Mill (Preliminary Crusher) 5 Crushed Material 9 Coarse Powder 11 Medium Powder 13 Ball Mill (Main Crusher) 38 Crusher 39 Sorter 40 Casing 41 Classification Air 42 Air Inlet 43 Air Exhaust Port 45 Coarse Powder Extraction Hopper 46 Medium Powder Extraction hopper 49 Classification space 50 Input chute 53 Boundary 54 Movable damper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuya Hatta 3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toyosu General Office

Claims (1)

[Claims] 1. A crushed product coarsely crushed by a preliminary crusher is sorted into a coarse powder and a medium powder by a sorter, and the sorted coarse powder is returned to the preliminary crusher and re-milled to perform the sorting. In the crushing device configured to introduce the fine powder into the main crusher and finely pulverize it, the sorting machine is provided with an air inlet on one side so that a flow of classification air flowing in the lateral direction is formed inside. A casing having an air exhaust port on each side, a coarse powder extraction hopper and a medium powder extraction hopper arranged in parallel at the lower part of the casing in order from the air introduction port side to the air exhaust port side, and at the boundary between both hoppers. A charging chute disposed on the upper part of the casing so that the pulverized material from the preliminary pulverizer is dropped and supplied across a required classification space on a near coarse powder extraction hopper, and a flow of classification air disposed at the boundary portion. A movable damper that can tilt in any direction A crushing device characterized by being made.