JPH0556281U - Three-way classifier - Google Patents

Abstract

(57) [Summary] [Purpose] Repairs and replacements are less frequent than conventional sieve classifiers, and the classifying capacity is higher than conventional sieve classifiers. (EN) Provided is an optimum three-way classifier which can separate particles and small-diameter particles accurately and efficiently and requires post-treatment according to the particle size of classified powder. [Structure] Raw material 2 supplied from raw material charging chute 21
When 0 is evenly dispersed and dropped by the raw material disperser 19 into the surroundings, the medium / small-diameter particles 20b and 20c in the raw material 20 are blown up by the air 5 introduced from the air introduction portion 6 to open the slit cone 18. The particles 16 are guided to the upper part of the casing 1 and further classified by the rotary classifying blade 14. The small-diameter particles 20c are taken out from the fine powder suction port 2, and the medium-sized particles 20b are taken out from the medium-sized particle discharge port 17. On the other hand, the large-diameter particles 20 a that do not get on the air 5 fall down and are taken out from the large-diameter particle discharge port 3.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a three-way classifier.

[0002]

[Prior Art]

 In recent years, a crushing facility has been considered in which cement raw materials are crushed in two stages by a preliminary crushing device and a main crushing device in a cement manufacturing facility to improve the crushing efficiency.

That is, the cement raw material from the raw material hopper is guided to a preliminary crusher (preliminary crusher) such as a crusher or a roller mill for preliminary crushing, and the crushed crushed product is introduced to a sieve classifier for sieving. The large size particles on the sieve separated by the sieve classifier are returned to the preliminary crusher again, and the medium and small size particles under the sieve separated by the sieve classifier are excellent in fine pulverization performance. It is introduced into a horizontal ball mill (main crusher) to perform main crushing. Furthermore, the crushed product crushed by the ball mill is introduced into an air classifier and reclassified to a medium diameter where crushing is insufficient. The particles were reintroduced into the ball mill, and the small-diameter particles were taken out as refined powder (product).

[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 crusher is simply separated into large-sized particles and medium / small-sized particles by the sieve classifier. With a type classifier, repair and replacement due to abrasion of the sieve mesh are frequently required, and there is a problem that the classifying capacity has a mechanical limit.

Further, since a large amount of medium- and small-sized particles adhere to the large-sized particles and are mixed and returned to the preliminary crusher, there is a problem that the pulverization efficiency of the preliminary crusher is lowered, and the particles are further introduced into the ball mill. Since small and medium-sized particles containing a large amount of small-sized particles to be products are included in the above-mentioned ball mill, the small-sized particles are crushed again (over-milling), resulting in a significant decrease in ball milling efficiency. Had a problem.

In addition, the mill equipment (crushing equipment including a ball mill) that is already in operation has a limited capacity for the in-equipment transportation machine and the in-equipment classifier, and the small-sized particles contained in the pre-milled pulverized material are However, there is a problem that the increase in capacity is limited because it must be handled within these limited capacities.

The present invention has been made in view of the above-mentioned circumstances. It requires less repair and replacement than the conventional sieve type classifier, and has a higher classification capacity than the conventional sieve type classifier. A three-way classifier that can separate raw materials into large-sized particles, medium-sized particles, and small-sized particles with high precision and efficiency, and is suitable for post-treatment according to the particle size of the classified powder. It is intended to be provided.

[0008]

[Means for Solving the Problems]

 The present invention has a casing having a fine powder suction port at the upper end and a large-diameter particle discharge port at the lower end, and an air inlet portion capable of uniformly introducing air from the circumferential direction at the lower portion, and a casing inside the casing. A rotary classifying blade arranged at the upper position so as to communicate the fine powder suction port with the inside, and a mortar shape so as to partition the inside of the casing between the rotary classifying blade and the air introduction section. A slit cone having an opening with a raised outer edge at a required circumferential position and a medium diameter particle discharge port penetrating the casing at the lower end, the slit cone and the air introduction part. And a raw material disperser having an upper part formed in a pyramid shape and a raw material feeding chute penetrating the casing so that raw material can be introduced from outside the casing above the raw material dispersing device. Characterized by three It relates to the direction classifier.

[0009]

[Action]

 Therefore, in the present invention, when the internal air is sucked through the fine powder suction port, the air is introduced from the air introduction tube, and the rotary classifying blade is rotated, when the raw material is supplied from the raw material chute in a predetermined amount, The raw material drops on a raw material disperser formed in a conical shape and is evenly dispersed and drops around the raw material, and medium- and small-sized particles in the raw material are uniformly introduced from the circumferential direction of the air introduction part. Is blown up to the inside of the casing through the opening of the slit cone, and large-diameter particles having a large particle diameter fall downward without being blown up by the air and are taken out from the large-diameter particle discharge port.

On the other hand, as for the medium / small diameter particles introduced into the upper part of the casing by the air, only the small diameter particles are passed when passing between the rotating rotary classification blades, and the medium diameter particles are the aforementioned rotary classification blades. The small particles that were separated by being repelled by the rotating classifying blades and passed between the rotary classifying blades are taken out as fine powder (product) through the fine powder suction port, and the medium-sized particles repelled by the rotary classifying blades are The centrifugal force causes the particles to fall along the inner peripheral surface of the upper part of the inner casing and the inner peripheral surface of the slit cone, and is taken out from the medium diameter particle discharge port.

[0011]

【Example】

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

1 and 2 show an embodiment of a three-way classifier of the present invention, in which 1 has a fine powder suction port 2 at the upper end and a large-diameter particle discharge port 3 at the lower end. In the lower part of the casing 1 which is squeezed downward, an air introducing portion 6 capable of uniformly introducing air 5 from the circumferential direction through the louver 4 is provided. An air introduction pipe 7 is connected to the.

A fine powder collecting device 10 including a fine powder collector 8 and a suction fan 9 is connected to the fine powder suction port 2.

Further, a plurality of rotary classification blades 14 rotatably supported by a drive shaft 12 and a mounting plate 13 which are connected to a rotary drive device 11 so as to transmit torque, are provided at an upper position inside the casing 1. The fine powder suction port 2 is disposed so as to communicate with the inner peripheral surface of the casing 1 at a required interval, and the casing 1 is provided between the rotary classification blade 14 and the air introduction portion 6. It has a mortar-like shape that divides the interior into upper and lower parts, and has an opening 16 in which a peripheral edge 15 is raised at a required position in the circumferential direction, and has a medium diameter particle discharge port 17 that penetrates the casing 1 at the lower end. A slit cone 18 is provided.

A raw material disperser 19 having an upper conical shape is disposed between the slit cone 18 and the air introducing portion 6, and the raw material 20 is placed directly above the raw material disperser 19. A raw material charging chute 21 is inserted into the casing 1 so as to penetrate the casing 1 so as to be charged.

Here, the raw material charging chute 21 is arranged along the slit cone 18, and the cone bottom plate between the adjacent openings 16 is configured as a top plate.

In addition, 20 a is a large particle in the raw material 20, 20 b is a medium particle in the raw material 20, 20 c is a small particle in the raw material 20, 22 is a cut-out damper of the large particle discharge port 3. Reference numerals 23 and 23 denote cut-out dampers of the medium-diameter particle discharge port 17.

Then, by driving the suction fan 9 of the fine powder collecting device 10, the internal air is sucked through the fine powder suction port 2 to introduce the air 5 from the air introduction pipe 7, and the rotary classification blade. When the raw material charging chute 21 supplies a predetermined amount of the raw material 20 in a state in which 14 is rotated, the raw material 20 is dropped onto the conical raw material disperser 19 and evenly dispersed around the circumference. However, the medium- and small-sized particles 20b, 20c in the raw material 20 are blown up by the air 5 that is evenly introduced from the circumferential direction of the air introduction part 6 and flow from the opening 16 of the slit cone 18 to the upper part inside the casing 1. The large particles 20 a having a large particle diameter are guided to the air 5 and fall downward without being blown up by the air 5 to be taken out from the large particle discharge port 3.

On the other hand, the medium / small diameter particles 20b, 20c introduced into the upper part of the casing 1 by the air 5 pass through only the small diameter particles 20c when passing between the rotating rotary classification blades 14 and The small-sized particles 20b are separated by being repelled by the rotary classification blades 14, and the small-sized particles 20c that have passed between the rotary classification blades 14 pass through the fine-particle suction port 2 and the fine-particle collecting device 10 has a fine-particle collecting device. 8 is collected as fine powder (product), and the medium-sized particles 20b repelled by the rotary classification blade 14 are subjected to centrifugal force on the upper inner peripheral surface of the casing 1 and the inner peripheral surface of the slit cone 18. And is taken out from the medium-sized particle discharge port 17. At this time, the medium-sized particles 20b falling along the inner peripheral surface of the slit cone 18 are blocked by the raised outer edge portion 15 of the opening 16 so that the medium-sized particles 20b do not fall from the opening 16 and the medium-sized particle discharge port. Guided to 17.

Therefore, according to the above-mentioned embodiment, since there is no part of the conventional sieve type classifier that is subject to severe wear like the sieve mesh, the frequency of repairs and replacements can be significantly reduced compared to the conventional sieve type classifier. In addition, the classification ability can be significantly improved as compared with the conventional sieve type classifier. Further, when the raw material 20 can be accurately and efficiently separated into the large particle 20a, the medium particle 20b, and the small particle 20c by one unit, and the post-treatment corresponding to the particle size of the classified powder is required. It is extremely effective for

For example, in a crushing facility in which a preliminary crusher such as a crusher or a roller mill (preliminary crushing device) and a horizontal ball mill (main crushing device) can perform two-stage crushing, the three-way classifier of this embodiment is used. When is used as a classifier between the preliminary crusher and the ball mill, the crushed material (raw material) from the preliminary crusher is accurately and efficiently converted into large particles 20a, medium particles 20b, and small particles 20c. Since they can be separated, only the large particles 20a are returned to the preliminary crusher without accompanying the medium and small particles 20b and 20c, and the ball mill is not accompanied with the already sufficiently small particles 20c. Only the medium-sized particles 20b can be returned, so that the crushing efficiency of the preliminary crusher and the ball mill can be significantly improved.

Further, since the small-sized particles 20c contained in the pulverized material (raw material) from the preliminary pulverizer can be immediately collected, the load on the in-equipment transportation machine and the in-equipment classifier can be significantly reduced. It is possible to increase the capacity of the entire crushing equipment.

[0023]

[Effect of the device]

 According to the above-described three-way classifier of the present invention, the frequency of repairs and replacements can be significantly reduced as compared with the conventional sieve classifier, and the classification ability is greatly improved over the conventional sieve classifier. In addition, the raw material can be separated into large-sized particles, medium-sized particles, and small-sized particles accurately and efficiently with one unit, and post-treatment according to the particle size of the classified powder is required. In this case, various excellent effects such as being extremely effective can be obtained.

[Brief description of drawings]

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Fine powder suction port 3 Large particle discharge port 5 Air 6 Air introduction part 14 Rotating classification blade 15 Outer edge 16 Opening 17 Medium diameter particle discharge port 18 Slit cone 19 Raw material disperser 20 Raw material 21 Raw material input chute

Claims (1)

[Scope of utility model registration request] 1. A casing having a fine powder suction port at an upper end and a large-diameter particle discharge port at a lower end, and an air introduction part capable of uniformly introducing air from a circumferential direction at a lower part, and a casing inside the casing. A rotary classifying blade arranged to communicate the inside of the fine powder suction port at an upper position, and a mortar-like arrangement so as to vertically divide the inside of the casing between the rotary classifying blade and the air introducing section. Between the slit cone and the air introducing portion, which is provided at a predetermined position in the circumferential direction, has an opening portion in which the outer edge portion is raised, and has a medium diameter particle discharge port penetrating the casing at the lower end. And a raw material disperser having an upper part formed in a pyramid shape and a raw material feeding chute that penetrates through the casing so that the raw material can be introduced from outside the casing above the raw material dispersing device. And three directions Classifier.