JPH09117683A - Vertical mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a filling material such as stearic acid to be deposited on the surface of a material to be crushed in order to obtain a finished product with superior function by enhancing hydrophilic or hydrophobic properties. SOLUTION: In a vertical mill for crushing a material to be crushed (a) by a crushing roller 4 or a crushing ball on a rotary table arranged in a casing 2, nozzles 10, 11, 12 are arranged which atomize a filling material solid at normal temperatures, after being liquefied by heating, into the casing 2 above the rotary table 3 so that the filling material is deposited on the surface of the crushed material (a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid roller mill for crushing an object to be crushed such as calcium carbonate as a filler for plastics and for adhering (coating) additives such as stearic acid to the surface of the object. , Vertical races such as ball race mills.

[0002]

2. Description of the Related Art As a mill of this kind, for example, the actual machine 61
The one disclosed in Japanese Patent Publication No. 79651 is known.
This is a rigid roller mill that crushes and grinds the object to be crushed with rollers or balls on a rotating table.
Each roller or ball is provided with a water spraying pipe disposed on the biting side in the vicinity of the roller or the ball, and the water spraying pipe has a spraying mechanism for uniformly spraying the powder that is caught in the roller or the ball. With this configuration, the friction coefficient of the powder increases with a small amount of water spray,
It is said that biting will be good and high pulverization efficiency will be maintained, and stable pulverization operation without abnormal vibration will be possible. In addition, although it is possible to spray a liquid with this conventional spraying mechanism, it is not possible to spray a solid.

[0003]

By the way, in the pulverization by the roller mill, not only the powder (the object to be crushed) is simply pulverized, but also a function such as hydrophobicity or hydrophilicity is added to the object to be crushed, that is, stearic acid. There is a case where an additive such as a coupling agent or a coupling agent is attached to an object to be crushed to obtain an object having an excellent function. In such a case, when the additive is a solid, if the object to be crushed and the additive are supplied to the rigid roller mill,
The crushing of the material to be crushed and the addition of the additive are carried out simultaneously.

However, for the object to be crushed, for example, 0.
When 1% by weight or more and 5% by weight or less of stearic acid was supplied to the rigid roller mill in a solid state, the fluidity of the crushed product was too good, and the pulverization efficiency was sometimes very poor. In other words, the hard roller mill grinds the object to be crushed by the table that rotates with the roller, but because the fluidity of the object to be crushed becomes too good, it is difficult to crush the object to be crushed between the roller and the table. become. Further, in addition to the poor pulverization efficiency as described above, the product obtained in such a state does not allow stearic acid to uniformly adhere to the surface of the object to be crushed. did not become. For example, the hydrophobicity of the product did not reach the expected level.

Therefore, the present invention solves the above-mentioned conventional problems and uniformly adds additives such as stearic acid to the surface of the crushed object in order to obtain a product having an excellent function by enhancing hydrophobicity and hydrophilicity. The object is to provide a tight mill that can be attached.

[0006]

In order to achieve the above object, the invention of claim 1 is a vertical mill for crushing an object to be crushed by a crushing roller or a crushing ball on a rotary table arranged in a casing, at room temperature. A nozzle for spraying into the casing above the rotary table is provided in order to liquefy the solid additive by heating and attach it to the surface of the crushed object. The invention of Claim 2 is Claim 1
In the above, a supply means for supplying an object to be crushed to a substantially central portion on the rotary table is provided in a casing above a predetermined height above the rotary table, and a nozzle is provided in a casing between the supply means and the rotary table. According to a third aspect of the present invention, in the second aspect, an airflow classifier is provided in the casing above a predetermined height above the supply means, and a second nozzle for spraying the liquefied additive is provided at the crushed material discharge port of the classifier. It is provided.

According to a fourth aspect of the present invention, in the first aspect, a supply means for supplying the object to be crushed to substantially the center of the rotary table is provided in the casing above the rotary table by a predetermined height. An airflow classifier is provided in the upper casing, and a nozzle is provided in the casing near the classifier. According to a fifth aspect of the present invention, in the fourth aspect, the second nozzle for spraying the liquefied additive is provided on the crushed material discharge port of the classifier. According to a sixth aspect of the present invention, in the first aspect, a supply unit that supplies the object to be crushed to a substantially central portion on the rotary table is provided in the casing above the rotary table by a predetermined height, and between the supply unit and the rotary table. The casing is provided with a nozzle, the airflow type classifier is provided in the casing a predetermined height above the supply means, and the nozzle is provided in the casing near the classifier. Claim 7
In a sixth aspect of the present invention, the second nozzle for spraying the liquefied additive is provided at the crushed material discharge port of the classifier.

[0008]

1 is a schematic front view showing a vertical roller mill according to a preferred embodiment of the present invention, and FIG. 2 is a front view showing the positional relationship between the vertical roller mill of FIG. 1, a collector and a blower. It is a figure. In FIG. 1, reference numeral 1 is a rigid roller mill, and a rotary table 3 is rotatably provided in a lower portion of a casing 2 of the roller mill as indicated by an arrow. A plurality of crushing rollers 4 for crushing the object to be crushed are provided on the rotary table 3.
It is rotatably arranged. Although only one is shown in FIG. 1, a plurality of rotary tables 3 are arranged at intervals along the peripheral edge. Reference numeral 5 denotes a screw feeder as a means for supplying the object to be crushed a. The screw feeder 5 is disposed at a substantially intermediate height position of the casing 2 so as to extend horizontally through the outside of the casing and the inside of the casing. Thus, the object to be crushed a is supplied from the supply port to almost the center of the rotary table 3. Reference numeral 6 denotes an air flow type classifier disposed in the upper part of the casing 2 and has a classifying blade 61. Outside the casing 1, a heating device 7 heats the additive b such as stearic acid, and includes a heating tank 71 and a heating device 72. Reference numeral 8 is a heat-retaining device for keeping the heated additive b warm, which is a jacket in which a high-temperature heat medium (hot water) is circulated and accommodated.
Has 81. As the heat-retaining device 8, it is possible to use the high-temperature heat medium shown in this embodiment as well as to keep it warm by electricity or gas.

Reference numeral 9 is a pump which is operated when transferring the additive b, and 10 is a nozzle for spraying the additive, which is arranged in a casing 2 approximately in the middle of the screw feeder 5 and the table 3. The nozzle 10 is heated by the heating device 7 and sprays the additive b kept warm by the warming device 8 into the casing 2 through the pipes 73, 91, 92, 93 by the operation of the pump 9. Ribbon heaters for electrically heating the pipes 73, 91, 92, 93 for transferring the additive b may be attached for heat retention.
Reference numeral 41 denotes an air intake port arranged below the table 3 in the lower part of the casing 2, and the air taken in from the intake port is sent upward in the casing 2 through a gap between the peripheral edge of the table 3 and the casing 2. . 42 is a discharge port for fine powder (product) and air which are the objects to be crushed, which is disposed above the classifier 6 above the classifier 6, and is provided with a rotary shaft 43 which pivotally supports the classifier 6 rotating at high speed. Discharge outlet part
It is provided in 44.

The operation of this embodiment will be described. The object a to be crushed is supplied from the outside of the casing to the inside of the casing by the screw feeder 5, is supplied from the supply port 51 to almost the center of the table 3, and is crushed by the rotary table 3 and the crushing roller 4. The finely crushed object a is an object that has not been sufficiently crushed due to the centrifugal force generated by the classifying blade 61 of the classifier 6 rotating at a high speed ascending in the casing 2 by the air sent from the air intake 41. The coarse powder is repelled and re-rotated in the casing 2 by the rotary table 3
Only fine powder, which is an object to be crushed, which has been finely crushed and dropped upward, is discharged from the discharge port 42 together with air.

On the other hand, the additive b is supplied to the heating tank 71 of the heating device 7 as it is when the crushed product a is crushed as described above, and is heated to a temperature higher than the melting point by the heater 72 to become a liquid. The liquid additive b passes through the pipe 73 and the heat insulation device 8
Sent to and kept warm, and the piping by the operation of the pump 9
It reaches the nozzle 10 via 91, 92, 93 and is sprayed from the nozzle 10 into the casing 2. The sprayed additive b adheres to the surface of the crushed object a falling from the supply port 51 of the screw feeder 5 or the surface of the finely crushed crushed object (coarse powder) a rising in the rising air current. To do. The additive b that has not adhered adheres to the object to be crushed in the process of rising with the ascending air current, and part of the additive b drops on the table 3 to be crushed on the object a.
Adheres to This additive b is not sprayed with the additive dissolved in a liquid such as water or an organic solvent, but is added with the additive b.
Since the substance is sprayed, only useful components can be attached to the object to be crushed a. Therefore, water and organic solvents may adversely affect the quality of products, but they do not.

The surface of the object to be crushed a falling from the supply port 51 of the screw feeder 5 has low activity and a small amount of adhesion. If the adhered amount is large, the fluidity of the object to be crushed a becomes too good as described in paragraph No. 0004, and the pulverization efficiency deteriorates. However, since the adhered amount is small, such a problem occurs. There is no fear. Additive b
Is a stearic acid or the like, it has a function as a grinding aid, and therefore descends and adheres to the surface of the object a to be ground between the rotary table 3 and the grinding roller 4, It contributes to reduction of driving force, increase of crushing ability and prevention of vibration. The position of the nozzle 10 is preferably provided above the crushing roller 4 so that a large amount of the additive b is not attached to the surface of the crushed object a crushed between the rotary table 3 and the crushing roller 4.

The crushed object a having the additive b adhered to the surface thereof as described above has a function such as hydrophobicity added thereto and becomes a product of excellent quality. Also, most of the additives b are
Although the object to be crushed a is attached immediately after being crushed, the surface of the object to be crushed a is greatly increased by the crushing and the activity is high, so that the additive is apt to be attached.

As another embodiment, instead of the nozzle 10,
The nozzle 11 may be provided through a pipe 94 shown by a chain line in FIG. The position where this nozzle 11 is provided is usually in a turbulent turbulent state, and by spraying the additive b at this position, the additive b and the object to be crushed collide, that is, the surface of the object to be crushed a. The possibility that the additive b will adhere uniformly increases. As described above, since the turbulent flow state is used in this embodiment, a large amount of the additive b can be uniformly attached to the surface of the object to be crushed a. Further, since the large single-particle crushed object (coarse powder) a descends by its own weight before reaching the upper part of the casing 2, there is little opportunity for the additive b to adhere to the surface of the coarse powder, and therefore the crushing roller 4 and the rotary table. During the period of time 3, the crushed object a to which a large amount of the additive b is attached is not crushed, and there is no fear that the crushed object a is fluidized and the crushing efficiency is reduced.

As another embodiment, a nozzle 11 may be provided in addition to the nozzle 10. In the case of this embodiment, the additive b is attached to the surface of the object a to be ground twice. At the lower position with the nozzle 10, the additive b is sprayed when the activity is high immediately after the crushed object a is crushed, and at the upper position with the nozzle 11, the crushed material a to which the additive b adheres as described above. The additive b is further attached to the surface of the. In this way, first, the additive b is sprayed at the lower position when the activity is high and attached to the surface of the object to be crushed, and then the additive b is sprayed at the upper position when the air flow is in a turbulent state. The additive b is repeatedly and evenly adhered to the surface of the additive b that first adheres. In this case, since the additive b is the same material, the adhesion efficiency is high. By doing so, a larger amount of the additive b is uniformly attached to the surface of the object to be crushed a, so that functions such as hydrophobicity and hydrophilicity are improved.

As another embodiment, in addition to the nozzle 10 (in this case, the nozzle 11 is not provided), the nozzle 12 may be provided via a pipe 95 shown by a chain line in FIG. As yet another embodiment, in addition to the nozzle 11 (in this case, the nozzle 10 is not provided), the nozzle 12 may be provided. As yet another embodiment, a nozzle 12 may be provided in addition to the nozzle 10 and the nozzle 11. In any case, the additive b is sprayed on the crushed material a discharged from the nozzle 12 at the crushed material discharge port portion 44 of the casing 2. This is performed when it is desired to attach a large amount (for example, about 5% by weight) of the additive b to the object to be crushed a. Therefore, the amount of adhesion increases, and the additive b adheres more completely to the surface of the object to be crushed a. Therefore, the functions such as hydrophobicity and hydrophilicity are further improved. Also, since the spraying position is the crushed material discharge port 44, the additive b
Therefore, there is no concern that the fluidity of the object to be crushed a on the rotary table 3 will be too good and the crushing efficiency will be deteriorated.

In any of the above embodiments,
As shown in FIG. 2, fine powder (product) which is the object to be crushed discharged from the object output port 42 of the casing 2 of the compact roller mill 1.
The air is sucked by a primary blower (exhaust air blower) 22 into a primary collector 23 such as a cyclone or a bag filter, where the product is collected. Then, about 80% of the air that has passed through the primary collector 23 is sent to the rigid roller mill 1 via the circulation pipe 24 (circulation circuit). The remaining 20% of air is 2
The next blower (exhaust air blower) 25 allows 2
The product is sucked into the secondary collector 26, where the product that could not be collected by the primary collector 23 is collected and only the air is exhausted by the secondary blower 25.

Although the amount of air exhausted from the secondary collector 26 is insufficient, the insufficient amount is eliminated by natural suction in the rigid roller mill 1 or by supplying air or hot air to the circulation circuit. In the above, the secondary collector 26 and the secondary blower
80% of the air sucked by the primary blower 22 by collecting the product by the primary collector 23 such as a bag filter while omitting 25.
It is also possible to circulate about the same amount and exhaust the remaining about 20%.
Therefore, air is circulated, so that the temperature inside the rigid roller mill 1 rises by about 30 ° C. from room temperature. Since the additive b is a solid at room temperature, if the temperature in the rigid roller mill 1 is room temperature, it will be solidified after spraying and easily return to a solid. However, since the temperature is kept high by circulating the air as described above, the additive b is unlikely to solidify and easily adheres to the surface of the object to be crushed a.

Although the vertical roller mill 1 having the crushing roller 4 is exemplified as the vertical mill in the above-mentioned embodiment, a plurality of crushing balls are arranged on the rotary table and the rotary balls are rotated on the balls. The present invention can be applied to a so-called ball race mill in which a table is provided and crushing balls are mounted in a bearing shape by upper and lower tables.

[0020]

The present invention has the above-described configuration,
Additives that are solid at room temperature, such as stearic acid, can be liquefied by heating and then evenly attached to the surface of the object to be crushed by spraying from a nozzle, resulting in increased hydrophobicity and hydrophilicity. There is an excellent effect that a product having an excellent function can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a vertical roller mill according to a preferred embodiment of the present invention.

FIG. 2 is a front view showing the positional relationship between the vertical roller mill of FIG. 1, a collector and a blower.

[Explanation of symbols]

 1 Vertical Roller Mill 2 Casing 3 Rotating Table 4 Grinding Roller 5 Screw Feeder (Supply Means) 6 Air Flow Classifier 7 Heating Device 8 Insulation Device 10, 11 Nozzles 12 Nozzle (Second Nozzle) a Crushed Material b Additive

Claims (7)

[Claims] 1. A vertical mill for crushing an object to be crushed by a crushing roller or a crushing ball on a rotary table arranged in a casing, wherein an additive which is solid at room temperature is liquefied by heating to crush the object to be crushed. A vertical mill provided with a nozzle for spraying into the casing above the rotary table so as to adhere to the surface. 2. A supply means for supplying an object to be crushed to a substantially central portion on the rotary table is provided in a casing above a predetermined height above the rotary table, and a nozzle is provided in a casing between the supply means and the rotary table. The vertical mill according to claim 1. 3. An air flow classifier is provided in the casing above a predetermined height above the supply means, and a second nozzle for spraying the liquefied additive is provided at the crushed material discharge port of the classifier. Vertical mill. 4. A supply means for supplying a material to be crushed to a substantially central portion on the rotary table is provided in a casing above a predetermined height above the rotary table, and an air flow classifier is provided in the casing above the predetermined height above this supply means. The vertical mill according to claim 1, wherein the casing is provided with a nozzle in the casing near the classifier. 5. The vertical mill according to claim 4, wherein a second nozzle for spraying the liquefied additive is provided at the crushed material discharge port of the classifier. 6. A supply means for supplying a material to be crushed to a substantially central portion on the rotary table is provided in a casing above a predetermined height above the rotary table, and a nozzle is provided in a casing between the supply means and the rotary table. The vertical mill according to claim 1, wherein an airflow classifier is provided in a casing above a predetermined height from the supply means, and a nozzle is provided in a casing near the classifier. 7. The vertical mill according to claim 6, wherein a second nozzle for spraying the liquefied additive is provided at the crushed material discharge port of the classifier.