JP2020000958A - Roll mill - Google Patents

Abstract

To provide a roll mill performing wet-milling treatment by combining a plurality of rolls with different revolving speeds and rotation directions, which can adjust the temperature of a doctor for scraping a treatment material off the last roll into a desired temperature as a whole.SOLUTION: A doctor 7 has a scraper 9 for scraping a treatment material off a roll and a doctor body 8 through which the scraped treatment material flows down, and a circulation space 15 through which a temperature controlling medium circulates is formed in the doctor body. The scraper 9 is held by a holding groove 20 of a supporter 10 to be exchangeable, and the temperature of the scraper is controlled to be optimal by circulation of the temperature controlling medium in a channel formed along the holding groove 20.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a roll mill for wet-milling and dispersing various printing inks, paints, coloring materials, ceramics, paints, sealing materials, electronic materials, chemicals, foods, feeds, and various other pastes, and in particular, discharges from rolls. The present invention relates to a roll mill capable of controlling the temperature of a processing material flowing on a doctor to an appropriate temperature and collecting the processed material in a receiving tank.

  A roll mill is a device for compressing and shearing a solid / liquid processing material between rolls and performing wet pulverization / dispersion processing. The roll mill has a plurality of rolls having different numbers of rotations and rotation directions. Is formed by combining three rolls of a rear roll, a middle roll, and a front roll. These rolls are driven by changing the rotation speed, for example, setting the rotation ratio to a ratio of 1: 3: 9. In such a rotation ratio, when the rear roll makes one rotation, the front roll makes nine rotations. . The processing material is supplied to a supply bank formed between the rear roll and the middle roll, passes between the rear roll and the middle roll by rotation of the roll, further passes between the middle roll and the front roll, and is discharged by the doctor. . Then, when passing between the rolls, the shearing force and the compressive force act on the processing material, and the liquid component is adsorbed and penetrates into the coagulated powder and powder in the processing material to promote the wetting and to be contained in the paste-like material. Powders and granules are reduced to fine particles.

  As described above, the processing material advances while sequentially passing between the rolls, and when the processing material finally shifts to the front roll, it is scraped off from the front roll by a doctor in contact with the surface of the front roll. This doctor consists of a scraper that scrapes the processing material in contact with the front roll and a doctor body that collects and flows down the processing material scraped by the scraper.The processing material collected by the doctor is finally collected in the receiving tank (For example, see Patent Document 1).

  In a roll mill, the processing material is compressed and sheared by a roll, so that the temperature of the processing material changes. In order to obtain a good paste-like material, the material is heated or cooled according to the properties of the processing material. There is a need. Usually, the roll body is configured to be able to be heated and cooled, and it is necessary to control the temperature even before the processing material scraped off the roll is collected in the receiving tank. Therefore, it is conceivable to provide a jacket through which a temperature control medium such as cooling water, hot water, or steam flows in the doctor main body to control the temperature of the processing material flowing on the doctor main body. However, for a material that is sensitive to temperature, the temperature difference between the ejected materials may be so large that uniform temperature control may not be possible. In other words, since the scraper wears, it is prepared as a replaceable replacement blade and is inserted into the holding groove provided in the holding body, but this holding body is larger than the doctor main body to support the load acting on the scraper. This is because the temperature control effect from the doctor body does not work effectively because it is made of a strong block body. For example, in the case of electronic materials, which are processing materials that are sensitive to temperature, it is necessary to cool them in a timely manner.However, even if the operation can be performed without any problems at the initial stage of operation, the scraper holder is thicker than the doctor body. As a result, heat from the scraper is accumulated in the holding portion over time. This heat is transmitted to the doctor body, and the temperature of the entire doctor tends to increase. In such a situation, if the water supplied to the jacket of the doctor body is switched to ultra-low temperature chiller water and the doctor body is to be cooled rapidly, dew condensation occurs on the doctor body, and the water generated by the condensation causes the water to be treated as an electronic material. There is a problem in that it is mixed in the material, resulting in a defective product.

  If the material to be processed is a high-viscosity material that can be processed with a heating roll or the like, the material must be heated appropriately after discharge, but the material scraped from the previous roll is transferred to a scraper at room temperature. When in contact, the material tends to solidify due to the temperature difference, leading to poor flow. In addition, the fluid lost its fluidity due to natural heat radiation to the atmosphere, and gradually accumulated on the doctor, and sometimes spilled around the doctor.

JP 2004-37241 A (paragraph 0007, FIG. 1)

  The problem to be solved by the present invention is to provide a roll mill in which a processing material is supplied between rolls to perform wet pulverization / dispersion processing, in which the processing material is scraped off from the last transferred roll by a scraper, flows down over the doctor body, and is collected in a receiving tank. In the meantime, it is an object of the present invention to provide a roll mill capable of adjusting the temperature of a processing material to an optimum temperature.

  According to the present invention, the number of rotations, a plurality of rolls having different rotation directions are combined in a parallel state, and the processing material subjected to wet pulverization / dispersion processing by passing between the rolls is scraped by a doctor from the last transferred roll. In the roll mill, the scraper of the doctor that scrapes the processing material in contact with the roll is exchangeably mounted on a holder fixed to the doctor body, and the doctor body and the holder have a flow path through which a temperature control medium flows. A roll mill characterized by being provided with a path is provided, and the above problem is solved.

  In the present invention, the flow path of the doctor main body is a circulation space formed by forming the doctor main body in a box shape, and the flow path of the holder has two flow paths extending along the holding groove for holding the scraper. The above-mentioned roll mill is provided, which comprises a long hole and a communication hole communicating the end of the long hole.

  The present invention is configured as described above, the doctor scraper is exchangeably mounted on a holder fixed to the doctor body, and a temperature control medium is allowed to flow through a channel provided inside the doctor body and the holder. Since the temperature can be adjusted by controlling the temperature, the scraper and the doctor main body that are in contact with the roll via the holding body can be heated or cooled to a desired temperature. Therefore, for example, when cooling the processing material transferred to the last roll, the scraper and its holder can be cooled to the same degree as the doctor main body, and the holder and the scraper store heat as in the past. Since the temperature does not rise, the processing material scraped off by the scraper can be immediately cooled to a desired temperature. Then, since the doctor body is cooled to a desired temperature, the treatment material that has subsequently flowed down onto the doctor body can be collected in the receiving tank without deteriorating its properties. For this reason, it is possible to prevent a phenomenon in which the temperature rises with the passage of time and the water is changed to chiller water in the middle to cause dew condensation as in the related art. When the treatment material is heated, the scraper and its holder can be heated to the same degree as the doctor body, so that the treatment material hardens or loses its fluidity due to natural heat radiation, so that the doctor material can be heated. It does not accumulate in the doctor or spill on the doctor side.

  When the flow path of the doctor main body is a box-shaped flow space, the doctor main body can be uniformly heated and cooled, and the flow path of the holding body extends along two holding grooves for holding the scraper. By providing a communication hole that communicates the long hole and the end of the long hole, the entire scraper and holder can be uniformly heated and cooled, and the temperature control effect can be enhanced. Further, when the holder having the flow path is formed by machining, the heat conduction becomes uniform, and the temperature control of the scraper can be easily and reliably performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a three-roll mill according to an embodiment of the present invention. The front view of a doctor. The side view of a doctor. FIG. 4 is an enlarged front view of a part of the holding body, which is omitted. FIG. 3 is an enlarged explanatory view of a part of a rear part of the doctor.

  FIG. 1 shows a three-roll mill, in which a roll mill main body 1 has a front roll 2, a middle roll 3, and a rear roll 4, and a weir plate 5 is provided between the rear roll 4 and the middle roll 3 to form a processing material. A supply zone 6 is formed. The processing material supplied to the supply zone 6 is compressed and sheared by the rotation difference between the rear roll 4 and the middle roll 3, and then is transferred and compressed and sheared between the middle roll 3 and the front roll 2. , And is collected in a receiving tank (not shown).

  The doctor 7 has a doctor main body 8 on which the processing material flows down on the upper surface, a scraper 9 in contact with the front roll 2 to scrape the processing material, and a holding body 10 thereof. The doctor body 8 has a saucer-shaped upper plate 11 and an edge plate 12 surrounding the periphery of the upper plate 11 in a substantially U-shape. A lower plate 13 is provided on the lower surface side of the upper plate 11, and the upper plate 11 A box-shaped circulation space 15 is formed between the plates 13 via hollow columns 14. The circulation space 15 is provided with a supply port 16 that communicates with a supply source of a temperature control medium such as cooling water, hot water, and steam, and a discharge port 17 that communicates with a collection unit that collects the temperature control medium. A partition plate 18 is provided in the inside so that the temperature control medium does not flow due to a short path, and a flow hole 19 is provided in a part of the support 14 so that the temperature control medium also flows in the support. It is provided.

  The holding body 10 is formed in a substantially rectangular parallelepiped shape extending in the axial direction of the front roll 2 and is formed to be longer than the upper end width of the upper plate 11 of the doctor main body 8. The holding groove 20 is provided along. The front part is formed in a shape that abuts on an end plate 21 that connects the rear part of the upper plate 11 and the lower part 13 of the doctor body 8, and is fixed to the doctor body 8 by welding at a position where the front part comes into contact with the end plate 21. . The scraper (replaceable blade) 9 is exchangeably inserted into the holding groove 20 together with the spacer 22.

  The holding body 10 has two long holes 23 adjacent to the holding groove 20 and extending longitudinally along the holding groove 20 as flow paths of a temperature control medium such as cooling water, hot water, or steam. A communication hole 24 that communicates the end of the communication hole 23 is formed. At one end of the one long hole 23, a supply port 25 for supplying the temperature control medium to the flow path is provided, and at one end of the other long hole 23, the temperature control medium flowing around the communication hole 24 is provided. An outlet 26 is provided for the outflow. The long hole 23 and the communication hole 24 are formed by drilling from one end to the other end of the holder by machining, and unnecessary ends that do not constitute a flow path are closed by welding a plug 27. Thereby, the holder can exhibit a good heat conduction effect as a whole.

  The temperature of the temperature control medium supplied to the doctor body 8, the scraper 9, and the holding body 10 is controlled by a control mechanism provided externally, such as the above-described temperature of the cooling water, hot water, steam, etc., according to the processing material. Can be adjusted.

  The doctor 7 is pressurized by an air cylinder (not shown), and the processing material transferred to the front roll 2 can be scraped off by a scraper 9 and flow down onto the doctor body 8. Since a cooling medium such as water or a heating medium such as steam is supplied to the flow space 15 of the doctor body 8 and the flow path of the holding body 10 as a temperature control medium in accordance with the properties of the processing material, The processing material transferred to the roll 2 is immediately scraped off by the scraper 9 adjusted to the desired temperature, flows down on the doctor body 8, and is collected in the receiving tank without deterioration while being maintained at the desired temperature. can do.

DESCRIPTION OF SYMBOLS 1 Roll mill main body 7 Doctor 8 Doctor main body 9 Scraper 10 Holder 11 Upper plate 13 Lower plate 14 Column 15 Flowing space 20 Holding groove 23 Long hole 24 Communication hole

Claims (4)

  In a roll mill in which a plurality of rolls having different rotation speeds and rotation directions are combined in a parallel state, and a processing material subjected to wet pulverization / dispersion processing by passing between the rolls and scraping the treated material from the last transferred roll by a doctor is used. The scraper of the doctor, which scrapes the processing material in contact with, is exchangeably mounted on a holder fixed to the doctor body, and the doctor body and the holder are provided with a flow path through which a temperature control medium flows. A roll mill.   The flow path of the doctor body is a flow space formed by configuring the doctor body in a box shape with the upper plate and the lower plate, and a support having a flow hole is provided between the upper plate and the lower plate. The roll mill according to claim 1.   The holding body has a holding groove for exchangeably holding the scraper in the longitudinal direction, and communicates between two long holes extending along the holding groove and ends of the long holes adjacent to the holding groove. The roll mill according to claim 1, further comprising a flow path including a communicating hole.   The roll mill according to claim 3, wherein the holding body is formed by machining, and ends of the long hole and the communication hole are closed with a stopper.

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