JPH0568948A - Classification apparatus and crushing equipment equipped with the same - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the classification accuracy with a small and simple structure, and to facilitate post-treatment according to the particle size of the powder after classification. An outer casing 31 having a raw material supply port 37 on an upper surface thereof, a primary air suction port 32 connected in a tangential direction on a side surface, and a coarse particle discharge port 39 at a lower end, and an inside of the outer casing 31. Placed and fixed on top 4
2, an inner casing 41 having a crushed material discharge port 44 penetrating the outer casing 31 at the lower end, a secondary air suction port 46 tangentially connected to the outer periphery of the inner casing 41, and the fixed classification blade. 42 concentrically provided on the inside of the rotary classification blade 47, a dispersion plate 50 fixed to the upper surface of the rotary classification blade 47, and fine powder collection communicating with the inside of the rotary classification blade 47 via a suction pipe 36. A device 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a classifying device and a crushing equipment equipped with the classifying device.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a crushing facility for increasing the crushing efficiency by crushing cement raw material 2 in two steps by a preliminary crushing device 20 and a main crushing device 30 in a cement manufacturing facility. The cement raw material 2 from the hopper 1 is preliminarily pulverized by a preliminary pulverizer (primary pulverizer) 21 such as a crusher or a roller mill via the raw material supply feeder 3, and the preliminarily pulverized granular material 22 is conveyed by the conveyor 2
3 and a conveying device 24 such as a bucket elevator to guide to a sieve type classifier 25 for classification.

The sieve classifier 25 comprises an inclined sieve plate 25a and a vibration generator 25b for vibrating the sieve plate 25a, and coarse particles on the sieve separated by the sieve classifier 25. 26 is the raw material supply feeder 3 via a conveyor 27
The pulverized material 28 under the sieve separated by the sieve classifier 25 is introduced into the horizontal ball mill (secondary pulverizer) 4 having excellent fine pulverizing performance via the conveyor 29 at one end in the axial direction. It is introduced from the mouth 5 to perform main crushing. In the ball mill 4, a large number of steel balls (balls) or cylindrical pebbles are packed in a cylindrical body that rotates about a substantially horizontal axis, and the crushed material 28 is crushed.

The crushed material 7 discharged from the other end outlet chamber 6 of the ball mill 4 is conveyed to the upper portion by a conveying device 8 such as a bucket elevator, and then guided to the pneumatic classifier 10 via an air slide 9 or the like. It has become.

The air type classifier 10 utilizes a circulating gas 12 by a circulating fan 11 which circulates by partially sucking the atmosphere or hot gas to pulverize the pulverized material 7 into a fine powder (product) 13 and a return powder 14. The returned powder 14 classified by the air classifier 10 is circulated through the air slide 15 to the crushed material introduction port 5 of the ball mill 4 and classified by the air classifier 10. The refined refined powder 13 is taken out as a product through the refined powder carry-out air slide 16.

Further, the outlet chamber 6 of the ball mill 4 is connected to a dust collecting fan 19 via a ball mill dust collector 18 by a suction pipe 17, and a part of the circulating gas 12 is guided to the ball mill dust collector 18. The fine powder 13 is separated by the ball mill dust collector 18, and the separated fine powder 13 is the fine powder carry-out air slide 1 described above.
It will be thrown into 6.

[0007]

However, in the conventional apparatus as described above, the powdery or granular material 22 preliminarily pulverized by the preliminary pulverizer 21 is sieve-classified having a sieve plate 25a which simply vibrates. The machine 25 separates the coarse particles 26 and the crushed materials 28 from each other. However, since the coarse particles 26 and the crushed particles 28 are frequently collected and replaced due to abrasion of the sieve mesh, there is a mechanical limit to the classification ability. Further, since a large amount of the crushed product 28 and the refined powder 13 adhere to the coarse particles 26 and are mixed and returned to the preliminary crusher 21, there is a problem that the crushing efficiency is lowered. 28 contains a large amount of refined powder 13 as a product. Therefore, the refined powder 13 is pulverized again in the ball mill 4, resulting in over-pulverization, and the pulverization efficiency of the ball mill 4 is significantly reduced. There was a problem that the crushing ability was reduced.

Further, the mill equipment (crushing equipment including a ball mill) which is already in operation has a limited ability in the in-equipment transportation machine and the in-equipment classifier, and the refined powder contained in the pre-crushed pulverized material 28. However, since it has to be handled within these limiting abilities, there is a problem that the ability increase is limited.

The present invention has been made in view of the above-mentioned problems of the prior art, and has a simple structure and can improve the classification ability.
An object of the present invention is to provide an optimum classifying device and a crushing equipment equipped with the classifying device when a post-treatment according to the particle size of the classified powder is required.

[0010]

According to the present invention, there is provided an outer casing having a raw material supply port on an upper surface thereof, a primary air suction port connected in a tangential direction of a side surface, and a coarse particle discharge port at a lower end thereof, An inner casing arranged inside the outer casing, having a fixed classification blade at the upper part, and having a pulverized material discharge port penetrating the outer casing at the lower end, and secondary air tangentially connected to the outer periphery of the inner casing. A suction port, a rotary classifying blade concentrically provided inside the fixed classifying blade, and a fixed upper surface of the rotary classifying blade extending to the upper side of the fixed classifying blade to receive the raw material from the raw material supply port. A classifying device comprising a dispersion plate, a fine powder collecting device composed of a fine powder collecting device and a suction fan, which communicate with the inside of the rotary classifying blade via a suction pipe, and the classifying device. The primary powder It was placed between the primary crusher and the secondary crusher so that the powdered material pulverized by the machine was introduced from the raw material supply port and the classified pulverized product was introduced from the pulverized material discharge port to the secondary crusher. It is related to the crushing facility that is the feature.

[0011]

In the present invention, the fine powder collecting device is driven to suck air through the suction pipe to suck air from the primary air suction port and the secondary air suction port and rotate the rotary classification blade. In this state, a raw material such as powder or granular material is supplied from the raw material supply port in predetermined amounts. Then, the raw material falls on the rotating dispersion plate and is dispersed outward in the circumferential direction by the centrifugal force, and falls between the outer casing and the inner casing. At this time, since the primary air sucked in the tangential direction from the primary air suction port is introduced into the fixed classifying blade from the circumferential direction, the fine powder and the pulverized material in the raw material ride on the primary air flow and the inner casing. The coarse particles having a large particle size that are guided into the inside and do not get on the primary air fall along the inner surface of the outer casing by the centrifugal force, and are taken out from the coarse particle discharge port.

Further, the fine powder and the pulverized product introduced into the inner casing by the primary air are sucked by the rotating rotary classification blade and the secondary air sucked tangentially from the secondary air suction port. The refined powder is separated by being placed on air, and the crushed substance that does not ride on the air flow falls along the inner surface of the inner casing by centrifugal force and is taken out from the crushed substance discharge port.

The fine powder sucked inside the rotary classification blade is collected by the fine powder collector of the fine powder collector through a suction pipe. Since this refined powder is processed without passing through operating equipment including a ball mill, the capacity increase by providing the preliminary crusher will be further increased.

As described above, the two steps of classification are performed by the fixed classifying blade and the rotary classifying blade, so that the coarse particles and the fine particles are efficiently removed, and the pulverized materials having the uniform particle size are accurately separated. Therefore, it is possible to greatly improve the pulverization efficiency when the pulverized product is guided to the secondary pulverizer and further pulverized.

[0015]

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

FIGS. 1 and 2 show an example of a classifying device 53 of the present invention, and FIG. 3 shows an example of applying the classifying device 53 of the present invention to a crushing facility for cement production shown in FIG. ..

In FIGS. 1 and 2, reference numeral 31 denotes an outer casing, which has a scroll shape having a primary air suction port 32 in a tangential direction of a side surface and has a center portion on the upper surface. Is provided with a suction pipe 36 connected to a fine powder collection device 35 including a fine powder collector 33 and a suction fan 34, and at equal intervals on the circumference of the circumference of the suction pipe 36. A plurality of raw material supply ports 37 for introducing the raw material 22 such as powder or granules from the transfer device 24 are fixed to the bottom of the slant portion 38 having a smaller diameter toward the lower side. 39 is provided.

An inner casing 41 is provided inside the outer casing 31 with a required space.

The inner casing 41 integrally has a fixed annular classifying blade 42 having a horizontal ring shape in the upper part, and the outer casing 31 is penetrated to the lower end of an inclined portion 43 having a smaller diameter toward the lower side. Then, there is a crushed material discharge port 44 extending outward on the lower side. A scroll-shaped passage 45 is formed between the outer casing 31 and the inner casing 41. Further, a secondary air suction port 46 connected tangentially is provided on the outer periphery of the inclined portion 43 of the inner casing 41, and a tertiary air suction port 48 connected tangentially is provided on the inclined portion 38 of the outer casing 31. .. Reference numeral 52 in the figure denotes a louver.

Inside the fixed classifying blade 42, a concentric rotary classifying blade 47 having a required distance 40 from the fixed classifying blade 42 is rotatably attached to the suction pipe 36.
A drive device 49 for rotating the rotary classification blade 47 is provided on the upper surface of the outer casing 31. Further, the dispersion plate 50 extending from the rotary classification blade 47 to the upper side of the fixed classification blade 42 is fixed on the upper surface of the rotary classification blade 47 so as to receive the raw material 22 from the raw material supply port 37. On the upper surface of the dispersion plate 50, a curved ridge 51 for dispersing the raw material 22 toward the outside is formed.

In the classifying device 53, the suction fan 36 of the fine powder collecting device 35 is driven to draw the suction pipe 36.
Through the primary air suction port 32 and the secondary air suction port 4
6, air is sucked from the tertiary air suction port 48, and the rotary classifying blade 47 and the dispersion plate 50 are rotated by the drive device 49.
A predetermined amount of raw materials such as

Then, the raw material (powder particles 22) falls on the rotating dispersion plate 50 and is dispersed outward in the circumferential direction by the centrifugal force, so that the passage 45 between the outer casing 31 and the inner casing 41 is formed. To fall. At this time, since the primary air sucked in the tangential direction from the primary air suction port 32 is introduced into the fixed classification blade 42 from the circumferential direction, the refined powder 13 and the pulverized material 28 in the raw material flow into the primary air flow. Coarse particles 26 having a large particle size that are guided to the inside of the inner casing 41 and do not get on the primary air fall along the inner surface of the outer casing 31 due to the centrifugal force, and the coarse particle discharge port 39.
And is returned to the preliminary crusher 21 via the conveyor 27.

Further, the fine powder 13 and the pulverized material 28 introduced into the inner casing 41 by the primary air are tangentially drawn from the primary air sucked by the rotating rotary classification blade 47 and the secondary air suction port 46. The fine powder 13 is separated by being placed on the sucked secondary air, and the pulverized material 28 that does not ride on the air flow falls along the inner surface of the inner casing 41 by centrifugal force and is taken out from the pulverized material discharge port 44. ..

The fine powder 13 sucked inside the rotary classifying blade 47 is collected by the fine powder collector 33 of the fine powder collecting device 35 through the suction pipe 36 and sent to the fine powder carry-out air slide 16. Be taken out as a product.

As described above, the fixed classification blade 42 and the rotary classification blade 47 perform the two-stage classification, so that the coarse particles 26 and the fine powder 13 are efficiently removed, and the pulverized material 28 having a uniform particle size is obtained. Can be accurately separated and taken out. Therefore, as shown in FIG. 3, the pulverization efficiency of the ball mill 4 in the pulverization equipment for further sending the pulverized material 28 to the ball mill 4 for pulverization can be greatly improved.

FIG. 4 shows another embodiment of the classifying device. In FIG. 1, the primary air suction port 32 is connected to the outer casing 3
1, while the outer casing 3
The same operation and effect can be achieved, except that the first inclined portion 38 is provided with the primary air suction port 32. Reference numeral 52 in the figure denotes a louver.

The present invention is not limited to the above-mentioned embodiments, but can be applied to various apparatuses in the case where a post-treatment such as further crushing of the classified pulverized product is required, and others. Of course, various changes can be made without departing from the scope of the invention.

[0028]

According to the classifying device of the present invention and the crushing equipment equipped with the classifying device, the coarse particles and the fine powder can be accurately and efficiently separated into particles having a small particle size in a compact structure. It is possible to take out the uniformly ground pulverized product, which facilitates the handling when the pulverized product is further pulverized, and has an excellent effect that the pulverization efficiency can be greatly improved.

[Brief description of drawings]

FIG. 1 is a cut front view showing an embodiment of the present invention.

FIG. 2 is an upper half view taken along the line IIB of FIG. 1 and a lower half taken along the line IIA of FIG.

FIG. 3 is a system diagram when the classification device of FIG. 1 is applied to a cement manufacturing facility.

FIG. 4 is a cut front view showing another embodiment of the present invention.

FIG. 5 is a system diagram showing an example of a conventional cement manufacturing facility.

[Explanation of symbols]

 4 Ball mill (secondary crusher) 21 Preliminary crusher (primary crusher) 22 Powder and granular material (raw material) 28 Crushed material 31 Outer casing 32 Primary air suction port 33 Fine powder collector 34 Suction fan 35 Fine powder collector 36 Suction Pipe 37 Raw Material Supply Port 39 Coarse Grain Discharge Port 41 Inner Casing 42 Fixed Classifying Blade 44 Crushed Material Discharge Port 46 Secondary Air Suction Port 47 Rotating Classifying Blade 50 Dispersing Plate 53 Classifying Device

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tsutomu Kawago 3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toyosu General Office (72) Inventor Nobuya Hatta 3-2-1 Toyosu, Koto-ku, Tokyo No. 16 Ishikawajima Harima Heavy Industries Co., Ltd.Toyosu General Office

Claims (2)

[Claims] 1. An outer casing having a raw material supply port on an upper surface thereof, a primary air suction port connected in a tangential direction of a side surface, and a coarse particle discharge port at a lower end thereof, and arranged inside the outer casing. An inner casing having a fixed classification blade at the upper part and a crushed material discharge port penetrating the outer casing at the lower end, a secondary air suction port tangentially connected to the outer periphery of the inner casing, and the fixed classification blade. A rotary classifying blade concentrically provided inside, a dispersion plate fixed to the upper surface of the rotary classifying blade and extending to the upper side of the fixed classifying blade to receive the raw material from the raw material supply port, and the rotary classifying blade. A classifying device, comprising: a fine powder collecting device including a fine powder collecting device and a suction fan, which communicate with each other through a suction pipe inside the container. 2. The primary classifier according to claim 1, wherein the granular material pulverized by the primary pulverizer is introduced from the raw material supply port, and the classified pulverized product is introduced into the secondary pulverizer from the pulverized product discharge port. A crushing facility, which is arranged between the crusher and the secondary crusher.