Sorting device

Abstract

To provide a fractionating device capable of stably fractionating powders such as cement raw materials by a simple configuration. A fractionating device 1 for fractionating some of a powder (cement raw material) R falling in a chute (main body) 2, wherein the fractionating device is equipped with a screw conveyor 5 which passes through the chute, a part of a casing 5a opening inside the chute, and receives part of the powder from an opening (inlet) 5b, and a collision separation member (collision separation rod) 4 which is provided above the screw conveyor in the chute and collides with an object when an object of a predetermined size or larger falls, and prevents the object from falling directly onto the screw conveyor. A rotation shaft 5d of the screw conveyor may be inclined from 5 to 20 with respect to the horizontal plane so that the end of the discharge port side of the screw conveyor is positioned above the other end and may be equipped with a guide member 3 that guides the powder falling in the chute in the direction of the opening of the screw conveyor.

Claims

1. A fractionating device for fractionating some of a powder falling in a first chute into a second chute, comprising: a screw conveyor passing through the first chute and being configured to extend to the second chute, a part of a casing opening inside the first chute, and receiving part of the powder from the opening, the screw conveyor having a discharging port side, an end of which is positioned above another end of the screw conveyor, and an inclination angle of a rotation shaft of the screw conveyor with respect to a horizontal plane is between 5 and 20; a guide member for guiding the powder falling in the first chute in a direction of the opening of the screw conveyor; and a collision separation member, which is mounted above the screw conveyor in the first chute, for colliding with an object when an object of a predetermined size or larger falls, and preventing the object from falling directly onto the screw conveyor, wherein rotation speed of a rotation shaft of the screw conveyor is variable.

2. The fractionating device as claimed in claim 1, further comprising a cooling water passage formed in the rotation shaft of the screw conveyor, and means, positioned outside the first chute, for feeding a cooling water to the cooling water passage.

3. The fractionating device as claimed in claim 1, wherein the collision separation member extends transversely to a longitudinal direction of the first chute.

4. The fractionating device as claimed in claim 1, wherein the collision separation member includes a plurality of separation rods arranged in an apex configuration.

5. The fractionating device as claimed in claim 1, wherein the guide member comprises a guide board positioned above the screw conveyor in the first chute, the guide board configured to be moveable relative to the first chute.

6. A fractionating device for fractionating some of a powder falling in a first chute into a second chute, comprising: a screw conveyor passing through the first chute and being configured to extend to the second chute, a part of a casing opening inside the first chute, and receiving part of the powder from the opening, the screw conveyor having a discharging port side, an end of which is positioned above another end of the screw conveyor, and an inclination angle of a rotation shaft of the screw conveyor with respect to a horizontal plane is between 5 and 20, a cooling water passage formed in the rotation shaft of the screw conveyor, and means, positioned outside the first chute, for feeding a cooling water to the cooling water passage; and a collision separation member, which is mounted above the screw conveyor in the first chute, for colliding with an object when an object of a predetermined size or larger falls, and preventing the object from falling directly onto the screw conveyor, wherein rotation speed of a rotation shaft of the screw conveyor is variable.

7. The fractionating device as claimed in claim 6, wherein the collision separation member extends transversely to a longitudinal direction of the first chute.

8. The fractionating device as claimed in claim 6, wherein the collision separation member includes a plurality of separation rods arranged in an apex configuration.

9. The fractionating device as claimed in claim 6, further comprising a guide board positioned above the screw conveyor in the first chute, the guide board configured to be moveable relative to the first chute.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a partially sectional front view showing a fractionating device according to an embodiment of the present invention.

(2) FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1.

(3) FIG. 3 is a cross-sectional view taken along line B-B in FIG. 1.

DETAILED DESCRIPTION

(4) Next, embodiments of the present invention will be explained with referenced to FIGS. 1 to 3 in detail. In the following explanation, as an embodiment, a fractionating device according to the present invention is used for a cement raw material (hereinafter abbreviated as raw material) that is discharged from a preheater cyclone of a cement burning apparatus.

(5) The fractionating device 1 according to the present invention includes: a raw material outlet 10a of a cyclone (third cyclone from the bottom, for instance) 10 of a preheater; a main body (chute) 2 coupled between the cyclone 10 and a raw material chute 11; guide boards 3 obliquely and downwardly penetrating an upper portion 2a of the main body 2; collision separation rods 4 horizontally penetrating the main body 2 below the guide boards 3; a screw conveyor 5 held by a holding member 6 and obliquely penetrating the main body 2 below the collision separation rods 4; and the like. To simplify drawings, the screw conveyor 5 is omitted in FIG. 2, and the screw conveyor 5 is horizontally illustrated in FIG. 3.

(6) The main body 2 is coupled through a flange 7 between the raw material outlet 10a of the cyclone 10 and the raw material chute 11, and includes the upper portion 2a with a rectangular cylindrical shape located just below the raw material outlet 10a, and a lower portion 2b with rounded corners located just above the raw material chute 11 with a cylindrical shape. On the top of the upper portion 2a are formed cleaning ports 8 and a pressure measuring port 9. The cleaning ports 8 are openable and closable, and are used in case that a raw material R adhere to an inner wall of the main body 2 or the screw conveyor 5. Into the pressure measuring port 9 is inserted a pressure gauge 12. On the inner wall of the main body 2 is disposed a refractory 2c.

(7) The guide board 3 is formed in a rectangular shape. As shown in FIG. 3, two guide boards 3 separately penetrate the top of the upper portion 2a of the main body 2 from the left side and the right side, and the angle 1 between the guide board 3 and the axis L of the upper portion 2a of the main body 2 is set to 40 or less, and the guide boards 3 guide the raw material R falling from the raw material outlet 10a toward the screw conveyor 5 that penetrates the upper portion 2a of the main body 2. The guide boards 3 are supported by the main body 2 in such a manner that insertion lengths into the main body 2 are variable, and when the raw material R falling from the raw material outlet 10a is guided to a receiving port 5b of the screw conveyor 5 without the guide boards 3, the guide boards 3 are not required.

(8) The collision separation rod 4 has a round cross section, and five collision separation rods 4 horizontally penetrate a central portion of the upper portion 2a of the main body 2. As clearly shown in FIGS. 2 and 3, the collision separation rods 4 are symmetrically arranged in a mountain like shape about the central collision separation rod 4. These collision separation rods 4 can crush large blocks falling from the raw material outlet 10a and prevent the large blocks from directly falling on the screw conveyor 5, which avoids breakage of the screw conveyor 5. Each collision separation rod 4 is extractably and insetably supported by the main body 2, and the number of the inserted collision separation rods 4 can be changed.

(9) The screw conveyor 5 is composed of: a casing 5a with a cylindrical shape including the receiving port 5b and a discharging port 5c; a rotation shaft 5d; a screw 5e fixed to the rotation shaft 5d; a motor 5g for controlling rotation speed of the rotation shaft 5d; and a cooling water passage 5f extending in the rotation shaft 5d over the overall length thereof. The receiving port 5b is an opening that is formed by removing the upper half of the casing 5a. An end portion on the discharging port 5c side of the rotation shaft 5d of the screw conveyor 5 locates above another end, and the rotation shaft 5d inclines from 5 to 20 (angle 2) with respect to the horizontal plane H.

(10) Next, action of the fractionating device 1 with the above construction will be explained with reference to FIG. 1.

(11) A part of the raw material R falling from the raw material outlet 10a of the cyclone 10 is introduced to the receiving port 5b of the screw conveyor 5, through the guide boards 3 and the collision separation rods 4 penetrating the main body 2 of the fractionating device 1, directly as they are or after crushed by the collision separation rods 4, and then enters in the casing 5a. The raw material R entering in the casing 5a is accommodated in a space formed between the inner wall of the casing 5a and the screw 5e; moves leftward by the rotation of the screw 5e; and finally discharged from the discharging port 5c on a fractionating chute 13 side. The raw material R that is not fractionated by the fractionating device 1 is supplied to lower cyclones and the like from the raw material chute 11.

(12) The raw material R is small in particle size and has considerably high fluidity, so that the raw material R sometimes tries to pass through between the inner wall of the casing 5a and the screw 5e of the screw conveyor 5 to rapidly move in the casing 5a toward the discharging port 5c. However, as described above, since the screw conveyor 5 is inclined in such a manner that the discharging port 5c is higher than the receiving port 5b, rapid movement of the raw material R toward the discharging port 5c of the casing 5a is prevented, which prevents larger amount of cement raw material R exceeding desired amount from being discharged from the discharging port 5c.

(13) In order to control the amount of fractionated raw material R, position of the guide board 3 is adjusted or rotation speed of the motor 5g of the screw conveyor 5, that is, rotation speed of the rotation shaft 5d is adjusted.

(14) When inner temperature of the main body 2 is high, a cooling water is fed to the cooling water passage 5f of the rotation shaft 5d from outside of the main body 2 to protect the rotation shaft 5d.

(15) In addition, the main body 2 of the fractionating device 1 can be coupled between the raw material outlet 10a of the cyclone 10 and the raw material chute 11 though the flange 7, so that the fractionating device 1 can be installed to an existing facility with ease. Further, through the flange 7, the main body 2 can be removed from the raw material outlet 10a and the raw material chute 11, and the fractionating chute 13 can be removed from the discharging port 5c. As a result, an overall fractionating device 1 can be removed, which enables easy maintenance.

(16) In the above embodiment, two rectangular guide boards 3 are mounted, the shape and the number of the rectangular guide boards 3, and the angle 1 between the rectangular guide boards 3 and the axis L of the upper portion 2a of the main body 2 are appropriately changeable in accordance with installation location of the fractionating device 1, the direction that the raw material R flows and so on.

(17) The cross section of the collision separation rod 4 is not limited to a round shape also, a rectangular cross section may be adopted. And, the number and installation location of the collision separation rods 4 can be appropriately changed. Provided that the collision separation rod 4 is able to crush large blocks falling from the raw material outlet 10a to prevent damage of the screw conveyor 5, the collision separation rod 4 is not limited to a rod shape but a plate shape with openings may be adopted for instance.

(18) Further, although a cement raw material that is discharged from a preheater cyclone of a cement burning apparatus is exemplarily fractionated, not only to the cement raw material but also to powders falling in chutes is applied the fractionating device of the present invention, especially preferable to powders with high fluidity and easily becoming large blocks due to aggregation.

DESCRIPTION OF THE REFERENCE NUMERALS

(19) 1 fractionating device 2 main body 2a upper portion 2b lower portion 2c refractory 3 guide board 4 collision separation rod 5 screw conveyor 5a casing 5b receiving port 5c discharging port 5d rotation shaft 5e screw 5f cooling water passage 5g motor 6 holding member 7 flange 8 cleaning port 9 pressure measuring port 10 cyclone 10a raw material outlet 11 raw material chute 12 pressure gauge 13 fractionating chute R raw material