JPH0677864U - Three-way classifier and crushing equipment using the classifier - Google Patents

Abstract

(57) [Summary] [Purpose] To enable the separation of raw materials into large particles, medium particles, and fine powders accurately and efficiently. A casing 1 having a fine powder suction port 2 at an upper end and a medium particle discharge port 3 at a lower end, a raw material charging chute 4 penetrating the upper end of the casing 1 and hanging inside the casing 1, and a casing 1 The rotary classification blade 10 provided on the outer periphery of the raw material feeding chute 4 at a position above the center and communicating with the fine powder suction port 2 on the center side, and the lower portion provided directly below the lower end of the raw material feeding chute 4 at a lower position inside the casing 1 and having a lower portion of the conical The fine powder A is provided with a dispersion plate 11 formed into a shape, and an air introduction duct 12 that penetrates the lower end of the casing 1 and has a funnel shape whose upper end extends along the lower part of the dispersion plate 11 to introduce air into the casing 1. Are taken out from the fine powder suction port 2, medium-sized particles B are taken out from the medium-sized particle discharge port 3, and large-sized particles C are taken out from the air introduction duct 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a three-way classifier for classifying pulverized powder into fine powder, medium-sized particles, and large-sized particles, and a crushing equipment using the classifier.

[0002]

[Prior art]

 In a cement manufacturing facility, it has been conventionally practiced to pulverize cement raw materials in two stages by a preliminary pulverizing device and a main pulverizing device.

That is, the cement raw material from the raw material hopper is introduced into a preliminary crushing device such as a crusher or a roller mill for preliminary crushing, and the crushed pulverized product is introduced into a sieve type classifier for sieving, and a sieve type classifier. The large particles on the sieve separated in step 1 are returned to the preliminary crusher, and the fine powder / medium particles under the sieve separated by the sieve classifier are converted to the main crusher such as a horizontal ball mill with excellent fine crushing performance. Introduce the main crushing, then introduce the crushed product crushed by the crusher to the air classifier and classify again. I was taking it out.

[0004]

[Problems to be solved by the device]

 However, in the conventional crushing equipment as described above, the crushed material preliminarily crushed by the preliminary crushing device is simply separated into large-sized particles and fine / medium-sized particles by a sieve classifier. The type classifier had a problem that it required frequent repairs and replacements due to abrasion of the sieve mesh, and its classifying capacity had a mechanical limit.

Further, since a large amount of fine powder / medium-sized particles are attached to and mixed with the large-diameter particles and returned to the preliminary crushing device, there is a problem that the pulverization efficiency of the preliminary pulverizing device is lowered. Since the fine powder / medium-sized particles that are guided to contain a large amount of fine powder to be used as a product, this pulverizer re-pulverizes the fine powder again, resulting in excellent fine pulverizing performance. However, there was a problem that the pulverization efficiency of this pulverizer, which has a small processing capacity, is significantly reduced.

[0006] Furthermore, the crushing equipment in operation has a restriction capability in the in-equipment transportation machine and the in-equipment classifier, and small particles contained in the pre-crushed pulverized material are also treated within these restriction capabilities. Since it has to be done, there is a problem that the processing capacity is limited.

The present invention solves the above-mentioned conventional problems, requires less frequent repair and replacement than conventional sieve classifiers, and has a higher classification capacity than conventional sieve classifiers. It is possible to accurately and efficiently separate large particles, medium particles, and fine powders, and to provide an optimal three-way classifier when post-treatment is required according to the particle size of the separated powder. In addition, the object is to provide a crushing facility using the classifier.

[0008]

[Means for Solving the Problems]

 The invention according to claim 1 of the present invention is a casing having a fine powder suction port in the upper part and a medium diameter particle discharge port in the lower part, and a raw material charging chute penetrating the upper end of the casing and hanging inside the casing. A rotary classifying blade provided on the outer periphery of the raw material feeding short at an upper position in the casing and having a center side communicating with the fine powder suction port; and a lower position directly below the lower end of the raw material feeding chute at a lower position in the casing. The lower part of the dispersion plate is formed in the shape of an inverted pyramid, and the upper end is formed into a funnel shape that penetrates the lower end of the casing and expands along the lower part of the dispersion plate. According to claim 2 of the present invention, there is provided a three-way classifier, comprising: an air introduction duct for separating large particles and medium particles and discharging large particles. The idea is to install the above-mentioned three-way classifier between the preliminary crushing device and the main crushing device so that the preliminary crushed material roughly crushed by the preliminary crusher can be guided to the raw material chute of the three-way classifier. In addition to the above, the medium-sized particles discharged from the medium-sized particle discharge port of the three-way classifier are guided to the main pulverizer, and the large-sized particles discharged from the air introduction duct of the three-way classifier are pre-milled. A pulverizing equipment using a three-way classifier characterized in that a fine powder collecting device for sucking and collecting fine powder is connected to the fine powder suction port of the three-way classifier. It is a thing.

[0009]

[Action]

 Therefore, in the three-way classifier according to claim 1 of the present invention, while introducing air into the casing from the air introduction duct and sucking air in the casing from the fine powder suction port to rotate the rotary classifying blade, When the raw material is thrown into the casing from the raw material chute, the raw material falls on the dispersion plate and is dispersed around the dispersion plate, and the fine powder of small particles and the medium particles are blown by the air blown from around the lower part of the dispersion plate. Ascends, the fine powder passes between the rotary classification blades and is sucked from the fine powder suction port to the outside of the casing, and the medium-sized particles are blown to the rotary classification blade and fall on the inner circumference of the casing to be discharged from the medium-sized particle discharge port. The large particles are discharged to the outside of the singing, and the large particles do not rise by the air blown from around the lower part of the dispersion plate, but fall into the air introduction duct and are discharged to the outside of the casing.

Further, in the crushing equipment using the three-way classifier according to claim 2 of the present invention, the preliminary crushed material roughly crushed by the preliminary crushing device is guided to the raw material chute of the three-way classifier. In the three-way classifier, fine particles, medium-sized particles, and large-sized particles are classified, and the medium-sized particles discharged from the medium-direction particle discharge port of the three-way classifier are guided to the crusher and finely crushed in three directions. The large-diameter particles discharged from the lower part of the air introduction duct of the classifier are returned to the preliminary crushing device, and the fine powder discharged from the fine powder suction port of the three-way classifier is collected by the fine powder collecting device.

[0011]

【Example】

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

FIG. 1 is a vertical cross-sectional view of an embodiment of a three-way classifier of the present invention. The casing 1 is formed in a funnel shape with a cylindrical upper portion and a reduced diameter lower portion. A fine powder suction port 2 extending laterally is provided on the side, and the fine powder suction port 2 is connected to a fine powder collector and a suction fan (not shown) so as to suck the air in the casing 1. ing. Further, the lower end of the casing 1 is provided with a medium diameter particle discharge outlet 3 extending laterally downward and connected to a medium diameter particle collector (not shown).

A cylindrical raw material charging chute 4 is penetrating the center of the upper end of the casing 1 and hangs down inside the casing 1. The lower end of the raw material charging chute 4 remains cylindrical, or a diaphragm plate or The guide plate 5 may be attached. Further, on the outer surface of the lower end of the raw material charging chute 4, an inverted conical straightening plate 6 whose diameter is expanded upward is attached.

A hollow rotary shaft 7 is disposed on the outer periphery of the upper portion of the raw material charging chute 4 where the flow straightening plate 6 is attached, and the hollow rotary shaft 7 is rotatable by the bearing 8 in the casing 1. And is rotated by a motor (not shown) via a transmission pulley 9 at the upper end. A large number of rotary classifying blades 10 are attached to the lower end of the hollow rotary shaft 7 radially or at a required angle with respect to the radial direction. The rotary classifying blades 10 are located above the straightening plate 6 in the casing 1. The center side communicates with the fine powder suction port 2.

Directly below the lower end of the raw material charging chute 4 inside the casing 1 is provided a dispersion plate 11 whose lower part has an inverted conical shape, and which penetrates the center of the lower end of the casing 1 to form a cylindrical shape. An air introduction duct 12 is provided so as to project inside the casing 1. The upper end of the air introduction duct 12 is formed in a funnel shape that expands along the above-mentioned inverted conical shape of the lower part of the dispersion plate 11, and the upper end of this funnel-shaped part 12 ′ and the inverted conical part of the lower part of the dispersion plate 11. A guide vane 13 is provided between the portion and the plate-shaped portion so as to support the dispersion plate 11. Note that, instead of the guide vanes 13, a simple support material may be provided. Air 14 is sucked into the air introduction duct 12 from the lower end, and the air 14 is blown into the casing 1 through the outer periphery of the lower portion of the dispersion plate 11.

In the embodiment shown in FIG. 1, the upper part of the dispersion plate 11 has a gentle conical shape, and the apex of the conical shape is located on the extension of the central axis of the raw material charging chute 4. The upper part of the dispersion plate 11 may be a horizontal plane 15 as shown by an imaginary line, or, as shown in FIG. 2, the upper part of the dispersion plate 11 is a horizontal disk 17 of a required size. The rotating shaft 16 provided at the lower center of the disc 17 may be rotated by a motor 18 provided inside the dispersion plate 11 or a motor provided outside the casing 1.

Next, the operation of the apparatus shown in FIG. 1 will be described.

Air 14 is blown from the lower end of the air introduction duct 12, the fine powder suction port 2 is sucked by an external suction fan (not shown), and the transmission pulley 9 at the upper end of the hollow rotary shaft 7 is rotated via a motor (not shown). Then, the rotary classification blade 10 is rotated. The air 14 blown from the air introduction duct 12 spreads along the inverted conical shape of the lower part of the dispersion plate 11 and passes between the guide vanes 13 or the support materials to diffuse upwardly into the casing 1. After that, it reaches the center side of the rotating classification blade 10 through the space between the rotating classification blades 10 and is sucked to the outside from the fine powder suction port 2.

In this state, when a predetermined amount of the raw material is supplied from the upper end of the raw material charging chute 4 as shown by an arrow 19, the raw material passes through the raw material charging chute 4 and falls to the center of the upper portion of the dispersion plate 11. When the upper part of the dispersion plate 11 has a gentle conical shape as shown in FIG. 1, the raw material dropped to the center of the upper part of the dispersion plate 11 is evenly distributed around the dispersion plate 11 along the gentle cone. When the upper part of the dispersion plate 11 is a horizontal flat surface 15, the raw material that has fallen to the center of the upper part of the dispersion plate 11 gradually accumulates in a conical shape at the center of the flat surface 15 and then rests. If it accumulates on the corners or more, it gradually collapses and is evenly dispersed around the dispersion plate 11 and falls. When the rotating disc 17 is attached as shown in FIG. 2, the raw material falls to the center of the disc 17 and is blown to the periphery by the rotation of the disc 17 from the periphery of the dispersion plate 11. It is evenly distributed and falls.

The fine powder and medium-sized particles in the raw material, which are evenly dispersed and fall from the periphery of the dispersion plate 11, spread along the shape of an inverted cone at the bottom of the dispersion plate 11, and are dispersed in the guide blade 13 or the support material. It is blown up by the ascending air current that diffuses upward in the casing 1 through the gap. Then, the fine powder A passes between the rotating rotary classification blades 10, reaches the center side of the rotary classification blades 10, and is sucked to the outside from the fine powder suction port 2. The medium-sized particles B are repelled by the rotating rotary classification blade 10 to be separated from the fine powder A, fall along the inner peripheral surface of the casing 1, and then are taken out from the medium-sized particle discharge port 3.

On the other hand, the large-diameter particles C in the raw material that are evenly dispersed and fall from the periphery of the dispersion plate 11 are diffused upward in the casing 1 along the shape of an inverted cone below the dispersion plate 11. Without being blown up, the air drops to the funnel-shaped portion 12 ′ at the upper end of the air introduction duct 12, and is discharged to the outside from the lower end of the air introduction duct 12 against the upward flow of the air 14 blown into the casing 1.

Therefore, according to the above-described embodiment, since there is no portion of the conventional sieve type classifier that is subject to severe wear like the sieve meshes, the frequency of repair and replacement is significantly reduced compared to the conventional sieve type classifier. In addition, it is possible to significantly improve the classification ability compared with the conventional sieve classifier.

Furthermore, the raw material can be accurately and efficiently classified into three kinds of fine powder A, medium-sized particles B, and large-sized particles C by one unit, and the treatment depending on the particle size of the classified powder. It is extremely effective when you need

FIG. 3 shows an example of the crushing equipment using the above-mentioned three-way classifier, which comprises a preliminary crushing device 20 such as a crusher or a roller mill and a main crushing device 21 such as a horizontal ball mill. In the crushing equipment 23 capable of performing stepwise crushing, the above-mentioned three-way classifier is used as a classifier between the preliminary crushing apparatus 20 and the main crushing apparatus 21.

That is, in the crushing facility 23, a three-way classifier 24 having the same configuration as that of FIGS. 1 and 2 is provided between the preliminary crushing device 20 and the main crushing device 21, and The raw material 26 from the hopper 25 is introduced into the preliminary crushing device 20 via the conveyor 27 or the like and coarsely crushed, and the coarsely crushed preliminary crushed product 26 ′ of the three-way classifier 24 is passed through the bucket elevator 28 or the like. The material is fed to the raw material charging chute 4 as a raw material for classification.

Further, the medium-sized particles B discharged from the medium-sized particle discharge port 3 of the three-way classifier 24 are introduced to the main crushing device 21, and the air of the three-way classifier 24 is discharged. The large-diameter particles C discharged from the lower part of the introduction duct 12 are returned to the conveyor 27 by the large-diameter particle return chute 30 connected to the lower end of the air introduction duct 12 through the air introduction chamber 29, and are newly supplied. The raw material 26 is returned to the preliminary crushing device 20.

Further, a fine powder collecting device 31 for sucking and collecting the fine powder A is connected to the fine powder suction port 2 of the three-way classifier 24. In the illustrated example, the fine powder collecting device 31 is a bag. It is composed of a filter 32 and a suction fan 33.

The medium-sized particles B introduced from the medium-sized particle discharge port 3 of the three-way classifier 24 to the main pulverizer 21 are finely pulverized by the main pulverizer 21 and discharged as the main pulverized product 26 ″. , Is guided to the air separator 35 through the bucket elevator 34, etc., and is classified into fine powder A and fine powder A ′, and the classified fine powder A ′ is returned to the main crushing device 21 via the air slide 36. The fine powder A is taken out as a product through the air slide 37.

According to the above-described embodiment, the preliminary crushed product 26 ′ (raw material for classification) from the preliminary crushing device 20 is accurately divided into the fine powder A, the medium particle B, and the large particle C by the three-way classifier 24, and Since the particles can be efficiently classified, only the large particles C are returned to the preliminary crushing device 20 without accompanying the fine powder A and the medium particles B, and the fine powder A which has already been sufficiently crushed is returned to the main crushing device 21. Only the medium-sized particles B can be returned without being entrained, whereby the grinding efficiency of the preliminary crushing device 20 and the main crushing device 21 can be significantly improved.

Further, since the fine powder A contained in the preliminary crushed product 26 ′ (raw material for classification) from the preliminary crushing device 20 can be immediately collected, the equipment such as the bucket elevator 34, the air slides 36, 37, etc. The load on the classifier inside the equipment such as the transport machine and the air separator 35 can be significantly reduced, and the capacity of the entire crushing equipment 23 can be increased.

The three-way classifier of the present invention and the crushing equipment using the classifier are not limited to the above-mentioned examples, and various modifications can be made without departing from the scope of the present invention. Of course, it can be added.

[0032]

[Effect of device]

 According to the three-way classifier of the present invention and the crushing equipment using the classifier described above, various excellent effects as described below can be obtained.

(I) In the three-way classifier according to claim 1, the frequency of repairs and replacements can be significantly reduced compared to the conventional sieve classifier, and the conventional sieve classifier is also available. The classification ability can be greatly improved.

(II) Since the raw material can be accurately and efficiently separated into three types of large-sized particles, medium-sized particles, and fine powder with one unit, post-treatment according to the particle size of the classified powder can be performed. It is extremely effective when needed.

(III) Since the fine powder suction port and the raw material charging chute are provided at the upper end of the casing, and the medium diameter particle discharge port and the air introduction duct are provided at the lower end of the casing, they project to the side of the casing. It is empty and can be installed in a small space.

(IV) In the crushing equipment using the three-way classifier according to claim 2, the crushed material (classification raw material) from the preliminary crusher is finely pulverized, medium-sized particles, and large-sized particles by the three-way classifier. Since it is possible to classify fine particles accurately and efficiently, only large particles are returned to the preliminary crushing device without accompanying fine particles and medium particles, and fine particles that have already been sufficiently crushed are returned to this crushing device. Only the medium-sized particles can be returned without being entrained, whereby the pulverization efficiency of the preliminary pulverizer and the main pulverizer can be significantly improved.

(V) Since the fine powder contained in the pulverized material (raw material for classification) from the preliminary pulverizing device can be immediately collected, the load on the in-equipment transportation machine and the in-equipment classification machine can be significantly reduced. It is possible to increase the capacity of the entire crushing equipment.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a three-way classifier according to claim 1 of the present invention.

FIG. 2 is a side view of another embodiment of the dispersion plate of FIG.

FIG. 3 is a schematic view showing an embodiment of a crushing facility using the three-way classifier according to claim 2 of the present invention.

[Explanation of symbols]

 1 casing 2 fine powder suction port 3 medium particle discharge port 4 raw material charging chute 10 rotating classifying blade 11 dispersion plate 12 air introduction duct 20 preliminary crushing device 21 main crushing device 23 crushing equipment 24 three-way classifier 26 'preliminary crushed product (classification) Raw material) 31 Fine powder collector A Fine powder B Medium particle C Large particle

Claims (2)

[Scope of utility model registration request] 1. A casing having a fine powder suction port in the upper part and a medium particle discharge port in the lower part, a raw material charging chute penetrating the upper end of the casing and hanging inside the casing, and an upper part in the casing. A rotary classifying blade which is provided on the outer periphery of the raw material feeding chute at a position and communicates with the fine powder suction port on the center side, and a lower portion formed immediately below the lower end of the raw material feeding chute at a lower position inside the casing, and the lower portion is formed into an inverted pyramid shape. Dispersed plate, and the upper end is formed in a funnel shape that penetrates the lower end of the casing and extends along the lower part of the dispersion plate, and introduces air into the casing, and large-sized particles and medium-sized particles above the funnel-shaped portion. A three-way classifier, characterized in that it is provided with an air introducing duct for separating large particles and discharging large diameter particles. 2. The three-way classifier according to claim 1 is provided between a preliminary crusher and a main crusher, and a preliminary crushed product roughly crushed by the preliminary crusher is used as a raw material for the three-way classifier. It is configured so that it can be guided to a charging chute, and the medium-sized particles discharged from the medium-sized particle discharge port of the three-way classifier are guided to the main pulverizer and discharged from the air introduction duct of the three-way classifier. A three-way classifier characterized in that it is configured to return the fine particles to the preliminary crushing device, and further a fine powder collecting device for sucking and collecting fine powder is connected to the fine powder suction port of the three-way classifier. The crushing equipment used.