JP2002052347A - Raw material supply apparatus for vertical mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a raw material supply apparatus for a vertical mill which can inhibit the pulsation of raw material supply, the vibration accompanying to raw material supply, and defective operations due to the deposition or lumps of a raw material. SOLUTION: This supply apparatus is characterized in that: it has a screw- feeder-like structure comprising a screw cylinder 11 having a raw material delivery port 9 formed at its one end and a screw 12 inserted through the other end of the screw cylinder 11 into the screw cylinder 11 so that the cylinder is supported at one side; the raw material delivery port 9 is kept closed with a damper 14 pressed in the closing direction; a raw material in the screw cylinder is advanced by the rotation of the screw 12 to fill the space at the front of the damper 14; and the advancing force of the raw material overcomes the pressing force of the damper 14, opening the damper 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of grinding a raw material such as coal (an object to be ground) by biting it between a rotating table and a roller rotating in contact with the table.
The present invention relates to an apparatus for supplying a raw material to a vertical mill that suctions and carries out a pulverized material.

[0002]

2. Description of the Related Art Conventionally, a flap damper or a rotary valve has been used as a raw material supply apparatus for the above-mentioned vertical mill, and outside air flows into a vertical mill which is at a lower pressure than the atmosphere in order to suction and carry out pulverized material. There has been known an apparatus capable of supplying a raw material to a vertical mill while suppressing the generation of the raw material.

[0003] The material supply device of the vertical mill using the above flap dampers alternately opens and closes a plurality of flap dampers attached to the upper and lower stages so that the materials fall sequentially. When one flap damper is opened, the other flap damper opens. By closing the flap damper, it is possible to supply the raw material while suppressing the outside air from flowing into the vertical mill. In addition, the raw material supply device of the vertical mill using the rotary valve rotates a rotor having a plurality of blades, and the raw material received between the blades is sequentially dropped with the rotation of the rotor. Raw materials can be supplied while suppressing the outside air from flowing into the mill.

[0004]

However, the conventional feeder for a vertical mill using flap dampers alternately opens and closes the upper and lower flap dampers to supply the raw material in a dropping manner. There is a problem that the particle size of the pulverized material becomes unstable due to the pulsation of the raw material supply. In addition, in the case of a raw material having high adhesiveness, there are problems that the raw material adheres and causes malfunction, and that the vibration accompanying opening and closing of the flap damper increases as the pressure difference between the inside and outside of the vertical mill increases. .

[0005] On the other hand, the above-mentioned conventional vertical mill feeder using a rotary valve has the advantage of easily suppressing the pulsation of the raw material supply and the generation of vibrations accompanying the raw material supply, but is not suitable for a highly adherent raw material. In addition, there is a problem in that a lump of raw material is caught between the rotor and the casing, which is likely to cause a malfunction.

The present invention has been made in view of the above-mentioned conventional problems, and can suppress the pulsation of the supply of the raw material and the generation of the vibration accompanying the supply of the raw material, and can also suppress the adhesion of the raw material and the malfunction due to the lump. The purpose is to be.

[0007]

According to the present invention, there is provided a screw cylinder having a horizontal cylindrical shape provided with a raw material discharge port at a tip thereof and having a raw material charging port provided above an intermediate portion. A screw inserted from the rear end of the screw cylinder into the screw cylinder in a cantilevered structure to advance the material that has entered the screw cylinder from the material input port to the material discharge port, and the material discharge port of the screw cylinder can be opened and closed And a damper pressed in the closing direction, and the material in the screw cylinder moves forward by the rotation of the screw, and the damper is elastically pressed by the advancing force of the material in a state where the material is filled before the damper. The present invention provides a raw material supply device for a vertical mill, which is capable of being pushed and opened in the vertical direction.

[0008] Further, according to the present invention, two screws which are rotated in opposite directions are provided in parallel.
It is preferable that the screw is a ribbon screw.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a schematic view of a vertical mill having a raw material supply device according to a first embodiment of the present invention, wherein A is a raw material supply device, and B is a vertical mill.

The vertical mill B is provided inside the casing 1 and is provided above the outer periphery of the disk-shaped table 3 which is rotated by the motor 2. Roller 4 that rotates with rotation
It is provided with. Although only one roller 4 is shown in the drawing, a plurality of rollers 4 are usually provided.

Above the central portion of the table 3, there is provided an inverted trapezoidal cone-shaped raw material dropping cylinder 5, and a lower end of a raw material chute 6 to which a raw material supply device A is connected is connected to the raw material dropping cylinder 5. It is connected. The raw material supplied from the raw material supply device A is supplied through the raw material chute 6 and the raw material dropping cylinder 5 to the center of the table 3. The raw material supplied to the center of the table 3 moves to the outer peripheral side by the rotation of the table 3, and is caught between the table 3 and the roller 4 to be pulverized.

In the upper part of the casing 1 of the vertical mill B, a pulverized material outlet 7 is provided. An induction fan (not shown) is connected to the pulverized material outlet 7. In addition, hot air is usually sucked in from the lower part of the casing 1 with the suction by the above-mentioned induction fan, and blows up from the periphery of the table 3 as shown by an arrow in the figure.

Among the pulverized materials that are caught and pulverized between the table 3 and the roller 4, the finely pulverized material is raised by the hot air flow accompanying the suction of the attraction fan, and is further moved by the raw material dropping cylinder 5. Classified by the separator 8 located above, the coarse material is again moved from the raw material dropping cylinder 5 to the table 3.
, And only fine objects are carried out from the pulverized material outlet 7.

As shown in FIG. 2, the raw material supply device A has a screw cylinder 11 having a horizontal cylindrical shape having a raw material discharge port 9 provided at a front end, and having a raw material input port 10 provided above an intermediate portion. , From the rear end of the screw cylinder 11,
It has a cantilevered structure and a screw 12 inserted into a screw cylinder 11. Raw material inlet 9
Is an inlet for the raw material into the screw cylinder 11. The screw 12 is rotated by a motor 13, and advances the raw material that has entered the screw cylinder 11 from the raw material input port 10 to the raw material discharge port 9.

The angle of the screw cylinder 11 is limited to a horizontal direction. When the angle is tilted, the raw material is extruded by the screw feeder and rises along the slope, but when the raw material contains lumps, the lumps may flow backward from the inclination of the cylinder and fall. Yes, in that case, the lump gets caught between the screw and the cylinder, and often causes a failure such as deformation or stoppage of the screw. Since the screw cylinder aims to extrude the input raw material including the lump as it is, the angle is set to be horizontal.

The tip of the screw cylinder 11 is connected to the upper part of the chute 6 described in FIG.
The raw material discharge port 9 located inside is closed by a damper 14 pressed against the raw material discharge port 9 from the outside.

The damper 14 is fixed to a damper shaft 15 provided in a direction perpendicular to the center axis of the screw cylinder 11. The damper shaft 15 is located above the damper 14, and the damper 14 is suspended from the damper shaft 15. The damper shaft 15 is rotatably supported, and the damper shaft 15 has a direction (preferably, orthogonal direction) crossing the center axis of the damper shaft 15.
A torque arm 16 protruding from the torque arm 16 is fixed, and a weight 17 is provided at a distal end of the torque arm 16.

That is, the damper 14 can tilt in the front-rear direction while rotating the damper shaft 15, thereby opening and closing the raw material discharge port 9. The weight 17 rotates the damper shaft 15 clockwise in the figure. Since the force for applying the force is applied, the material is constantly pressed in a direction in which the material discharge port 9 is kept closed.

An air cylinder 19 connected to an intermediate portion of the torque arm 16 via a wire 18 is used to lift up the torque arm 16 and open the damper 14 during, for example, cleaning.

As described above, the raw material in the screw cylinder 11 is advanced in the direction of the raw material discharge port 9 by the rotation of the screw 12, and the raw material discharge port 9 is closed by the damper 14 as described above. Therefore, the raw materials are
The screw cylinder 11 is filled before the damper 14 (the hatched portion in the figure indicates the filled material). When the screw 12 is further rotated in a state where the raw material is filled, and the force for pushing the damper 14 outward due to the forward force of the raw material is increased, the damper 14 is gradually opposed to the pressing force of the weight 17 in the closing direction. And the raw material is gradually dropped and supplied.

As described above, in the present invention, the damper 14 is pushed open when the screw cylinder 11 is filled with the raw material before the damper 14 and the raw material is dropped and supplied. The intrusion of outside air can be suppressed by the filled raw material. Further, after the damper 14 is pushed open, the raw material can be gradually extruded almost continuously by the rotation of the screw 12, so that the pulsation of the raw material supply and the vibration accompanying the raw material supply are suppressed, and the raw material supply is suppressed. Since the rotation is forcibly performed by the rotation of the screw, it is easy to suppress a malfunction even with a raw material having strong adhesion or a raw material having a lump.

The pressing force of the damper 14 in the closing direction is adjusted so that the damper 14 is pushed and opened after the material is filled. The adjustment of the force pressing the damper 14 is performed by the weight 17
It can be performed by adjusting the rotational force of the damper shaft 15 applied by the above. Specifically, the weight 17 can be replaced (change in weight) or the position of the weight 17 on the torque arm 16 can be adjusted.

Further, when the damper 14 is pushed open and the raw material is dropped and supplied, it is necessary to prevent a large amount of raw material from dropping at once and the raw material discharge port 9 to communicate with the raw material input port 10. The diameter of the screw 12 (the diameter of the screw cylinder 11), the pitch of the screw 12, the rotation speed of the screw 12, and the damper 14 are determined according to the supply speed of the raw material.
And the position of the raw material inlet 10 are determined.

In this embodiment, the weight 17 is used to press the damper 14. However, if the damper 14 can be pressed in the closing direction so that it can be pushed open from the inside, for example, a spring is used. It can also be pressed or pressed using an air cylinder. This is the same in second and third examples described later.

A second embodiment of the present invention will be described with reference to FIG. In FIG. 3, the same reference numerals as those in FIG. 2 indicate the same members or parts.

The difference between the second example and the first example is that the screw 12 is a ribbon screw having only a wing without a central axis, and that the material discharge port 9 is opened obliquely downward. is there.

When the material has a central axis as in the case of the screw 12 in the first example described above, if the adhesiveness of the raw material is high, the raw material may be attached to the central shaft portion and the feed of the raw material may be irregular. is there. In the case of the screw 12 (ribbon screw) of the present example, there is no central axis itself to which the raw material adheres, and therefore, there is an advantage that irregular feeding of the raw material due to the adhesion of the raw material to this central axis can be prevented. Also, since the ribbon screw is easily elastically deformed, the bulk material is
The screw 12 escapes due to the elastic deformation even when the screw 12 is bitten between the screw cylinder 11 and the screw cylinder 11, and the rotation of the screw 12 is hardly hindered. Further, when the raw material discharge port 9 is obliquely downward, the raw material discharge port 9 can be pushed open while the damper 14 is inclined in the direction of the raw material discharge port 9, and the supplied raw material is
4, since the raw material slides down, there is also an advantage that the raw material can be easily prevented from dropping at once.

A third embodiment of the present invention will be described with reference to FIG. 4, the same reference numerals as those in FIGS. 2 and 3 indicate the same members or parts. In FIG. 4, FIG.
The wire 18 and the air cylinder 19 shown in FIG. 3 are omitted.

The third example uses two parallel screws 12, 12, and the two screws 12, 12 are the ribbon screws described in the second example. I have. The screws 12, 12 have their blades twisted in opposite directions, and are simultaneously rotated in opposite directions by a motor 13. That is, the two parallel screws 12 are twisted in such a direction that the raw material can be pushed toward the raw material discharge port 9 in accordance with the respective rotation directions.

The third example is similar to the second example except for the above points.
Is the same as in the example. When two screws 12 and 12 that are rotated in opposite directions are provided in parallel as in this example, even if the raw materials adhere to the screws 12 and 12, the screws 12 and 12 can scrape each other. The effect of preventing malfunction due to the adhesion of the raw material can be further enhanced. In this example, a ribbon screw is used, but two screws 12 having a central axis as shown in FIG. 2 may be arranged in parallel and rotated in opposite directions.

[0032]

The present invention has been described above, and has the following effects.

(1) Since the damper 14 is pushed open in a state where the material is filled in the screw cylinder 11 just before the damper 14 and the material is dropped and supplied, the intrusion of outside air at the time of material supply is prevented by the filling. It can be suppressed with the used raw material.

(2) After the damper 14 is pushed open, the raw material can be gradually and almost continuously extruded by the rotation of the screw 12, so that the pulsation of the raw material supply and the vibration accompanying the raw material supply are suppressed.

(3) Since the supply of the raw material is forcibly performed by the rotation of the screw, it is easy to suppress the malfunction of the raw material even if the raw material has a strong adhesive property or has a lump.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a vertical mill having a raw material supply device according to a first example of the present invention.

FIG. 2 is a sectional view of a raw material supply device according to a first example of the present invention.

FIG. 3 is a sectional view of a raw material supply device according to a second example of the present invention.

FIG. 4 is a perspective view showing a cross section of a part of a raw material supply device according to a third example of the present invention.

[Explanation of symbols]

 Reference Signs List A raw material supply device B vertical mill 1 casing 2 motor 3 table 4 roller 5 raw material dropping cylinder 6 raw material chute 7 pulverized material take-out 8 separator 9 raw material discharge port 10 raw material inlet 11 screw cylinder 12 screw 13 motor 14 damper 15 damper shaft 16 Torque arm 17 Weight 18 Wire 19 Air cylinder

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Asaaki Nishioka 2209 Aomi, Aomi-cho, Nishikubiki-gun, Niigata F-term in the Aomi Plant of Denki Kagaku Kogyo Co., Ltd. 3F040 BA01 BA02 CA08 EA01 4D063 EE03 EE12 GA07 GA08 GC01 4D067 EE02 EE04 GA02 GA04

Claims (3)

[Claims] 1. A screw cylinder having a laterally cylindrical shape having a raw material discharge port provided at a leading end thereof and having a raw material charging port provided above an intermediate portion, and a cantilevered structure inside the screw cylinder from a rear end of the screw cylinder. A screw inserted into the screw cylinder to advance the raw material that has entered the screw cylinder from the raw material input port to the raw material discharge port, and a damper that can open and close the raw material discharge port of the screw cylinder and is pressed in the closing direction, A vertical type characterized in that the raw material in the screw cylinder is advanced by the rotation of the screw, and can be pushed open against the pressing force by the advancing force of the raw material in a state where the raw material is filled before the damper. Mill feeder. 2. Two screws rotated in opposite directions to each other,
The raw material supply device for a vertical mill according to claim 1, wherein the raw material supply devices are provided in parallel. 3. The raw material supply device for a vertical mill according to claim 1, wherein the screw is a ribbon screw.