JP7104404B2 - Roll mill - Google Patents

Description

The present invention kneads, disperses, and crushes processed materials in the manufacturing processes of various printing inks, paints, coloring materials, ceramics, paints, sealing materials, electronic materials, chemicals, foods, feeds, and other various products. The present invention relates to a roll mill for forming a supply bank between rolls, and particularly relates to a roll mill characterized by a pressure structure of a weir plate that closes an end portion between rolls.

In the roll mill, a plurality of rolls having different rotation speeds and rotation directions are provided adjacent to each other, and the processing material is made into fine particles by the compression action and the shearing action generated between the working peripheral surfaces of the rolls to perform the kneading treatment, the dispersion, and the crushing treatment. Widely used to do this. For example, in the three-roll mill, as shown in FIG. 1, three rolls of a front roll 2, a middle (center) roll 3, and a rear (supply) roll 4 are arranged adjacent to the roll mill main body 1 in the front-rear direction. , The rear roll 4, the middle roll 3, and the front roll 2 are increased in rotation speed in this order. The processing material is supplied to the supply bank 5 formed between the rear roll 4 and the middle roll 3, and the supply bank 5 is formed by closing the end portion with a weir plate 6 so that the processing material does not leak from between the rolls. ing.

As a configuration in which the weir plate 6 is installed, a curved surface 8 matching the shape of two adjacent rolls is formed to face the lower end portion 7 of the weir plate 6, and the lower end portion 7 is formed on the outer periphery of each roll. There is known an additional type (see, for example, Patent Document 1) in which leakage is prevented by placing the product on the peripheral surface 9 under its own weight. Further, as shown in FIG. 3, a seal peripheral surface 11 having a small diameter is formed on the side of the acting peripheral surface 9 of the roll via the vertical end surface 10 instead of the acting peripheral surface 9 of the roll performing the compressing and shearing action. A side seal method is also known in which the inner side surface 20 of the weir plate 6 is pressed against the vertical end surface 10 and at the same time the curved portion 8 of the weir plate is pressed against the seal peripheral surface 11.

In the side seal method, in order to simultaneously press the lower end portion 7 of the weir plate 6 in the vertical end surface 10 direction of the roll and the seal peripheral surface 11 direction, as shown in FIG. A pressure receiving portion 13 having 12 is formed. Then, conventionally, as shown in FIG. 7, in order to press the pressure receiving portion 13, the hydraulic piston device 15 having the pressing shaft 14 whose tip 17 is sharpened in a substantially conical shape is fixed at the opposite position on the roll mill main body 1 side. It is done. When the pressure piston 16 of the hydraulic piston device 15 is driven, the pressing shaft 14 moves linearly, and one point of the substantially conical tip 17 abuts on the pressure receiving portion 13 to press the weir plate 6. Since the pressure receiving portion 13 is provided in the center of the weir plate 6, the force that presses the weir plate 6 in the vertical end surface 10 direction of the roll and the seal peripheral surface 11 direction by the component force of the force due to the inclined surface 12 of the pressure receiving portion 13. Occurs. As shown in FIG. 8, before the roll moves, the position of the pressure receiving portion 13 with which the tip 17 of the pressing shaft 14 abuts is on the side center line 18 of the weir plate 6 and coincides with each other. The dam 6 can be pressed against the front and rear rolls with equal force to seal.

On the other hand, in the roll mill, the rolls are provided so as to be movable in the front-rear direction so that the distance between adjacent rolls can be finely adjusted. The configuration of this movement differs depending on which roll is moved with respect to the fixed roll. For example, in the case of a three-roll mill, the middle roll 3 is fixed, and the middle roll fixed type in which the rear roll 4 and the front roll 2 can be brought close to and separated from the middle roll 3 or the front roll 2 is fixed and the rear roll 2 is fixed. A front roll fixing method is known in which the roll 4 and the middle roll 3 are brought close to and separated from the front roll 2. In the case of the front roll fixing method, the amount of movement of the roll is about 1.2 mm at the maximum. As described above, the pressing shaft 14 is fixed to the roll mill main body 1 side, and as shown in FIG. 8, the pressure receiving portion 13 is pressed by a pressing load acting on one point of the tip 17, as described above. Before moving the roll, the point of action coincides with the center of the side surface of the weir, that is, the position of the side center line 18 passing through the center of the pressure receiving portion 13. When the weir moves with the movement of the roll, the pressure receiving portion 13 of the weir moves to a position where the position of the center line 18 is displaced by a distance L from the position before the movement, but the pressing shaft 14 is the roll mill main body 1. It is fixed to and does not move. As a result, as shown in FIG. 9, the contact position of the tip 17 and the position of the center line 18 of the pressure receiving portion 13 of the weir plate 6 are deviated by a distance L, and the weir plate 6 is misaligned and pressed. Become. Therefore, the pressure receiving portion 13 of the weir plate 6 is scratched by the tip of the pressing shaft 14. Further, since the position of the point of action that presses the weir plate 6 deviates from the side center line, the load acting on the seal peripheral surface 11 and the vertical end surface 10 becomes uneven, causing uneven wear and affecting the maintenance time. It was the cause. Further, since the rotation speeds of the adjacent rolls are different as described above, the end face of the weir plate 6 in contact with the side having the higher rotation speed is easily worn, and leakage occurs when a gap is generated. When the weir plate 6 is misaligned and the front and rear are pressed unbalancedly, such an uneven gap is more likely to occur.

Japanese Unexamined Patent Publication No. 2008-23967 (paragraph 0010, FIG. 2)

The problem to be solved of the present invention is to form a seal peripheral surface on the side of the working peripheral surface of the roll via a vertical end surface, and press the lower end portion of the weir plate against the vertical end surface and the seal peripheral surface to form a supply bank. In the roll mill, even if the roll is moved in the front-rear direction of the roll mill body, the lower end of the weir plate is evenly distributed on the vertical end surface of the adjacent roll and the peripheral surface of the seal without causing misalignment in the portion pressing the weir plate. It is to provide a roll mill which can be pressed.

According to the present invention, a seal peripheral surface is formed on the side of the working peripheral surface of the roll via a vertical end surface, and a pressure receiving portion provided in the center of the side surface of the weir plate is pressed to press the lower end portion of the weir plate to the vertical end surface. In a roll mill that presses against the peripheral surface of the seal to form a supply bank, a pressure shaft is provided on the roll mill body facing the center of the side surface of the weir, and the tip of the pressure shaft abuts on the pressure receiving portion. A pressing head having a contact portion formed on the peripheral edge is provided, and when the weir plate and the pressure receiving portion move in the front-rear direction of the roll mill body, the pressing head is added so that the contact portion moves following the movement of the pressure receiving portion. A roll mill characterized in that it is rotatably connected to a pressure shaft is provided, and the above-mentioned problems are solved.

In the present invention, the pressing head is formed in the shape of a conical cone having a contact portion inclined toward the outer peripheral edge side, and the pressing head is supported by a pressurizing shaft via a needle roller bearing with a thrust ball bearing. The above roll mill is provided.

The present invention is configured as described above, and a pressing head having a contact portion formed on the peripheral edge facing the pressure receiving portion provided in the center of the side surface of the weir plate is provided, and the weir plate is made of a roll. Since the pressing head is rotatably connected to the tip of the pressure shaft so that the contact portion rotates and moves following the movement of the pressure receiving portion when moving in the front-rear direction along with the movement, the pressure receiving portion of the weir plate is formed. Even if it moves, the contact portion rotates and the pressure receiving portion can be pressed at the side center line portion, and the lower end portion of the weir plate is evenly pressed against the vertical end surface of the front and rear rolls and the peripheral surface of the seal. Can be done. By applying an average load to the weir plate in contact with the front and rear rolls in this way, uneven wear can be prevented and leakage of the treated material can be prevented.

When the pressing head is formed in the shape of a cone having an annular contact portion inclined toward the outer peripheral edge side, the contact with the inclined surface of the pressure receiving portion is ensured, and the pressing load is accurately applied to the dam. Can be done. Further, when the pressing head is supported on the pressurizing shaft via a needle roller bearing with a thrust ball bearing, the pressing head easily rotates even if the pressing load from the pressurizing shaft becomes large, which causes a problem. Never.

An explanatory view of a three-roll mill showing an embodiment of the present invention. Explanatory drawing which shows the relationship between a weir and a roll. Explanatory drawing of the side seal method. FIG. 5 is a cross-sectional view showing an embodiment of the pressing body of the present invention. Explanatory drawing which shows the relationship between a pressing head and a pressure receiving part. Explanatory drawing which shows the relationship between a pressure receiving part and a pressing head when a weir is moved. Explanatory drawing which shows the conventional side seal system. Explanatory drawing which shows the relationship between the conventional pressing shaft and a pressure receiving part. Explanatory drawing which shows the relationship between the conventional pressing shaft and a pressure receiving part when a weir is moved.

FIG. 1 shows an embodiment in which the present invention is applied to a three-roll mill, and the same parts as those of the above-mentioned conventional roll mill are designated by the same reference numerals and will be described below. The roll mill main body 1 is provided with a front roll 2, a middle roll 3, and a rear roll 4 having different rotation speeds and rotation directions, and a supply bank 5 is formed between the rear roll 4 and the middle roll 3. The processing material is supplied to the supply bank 5 and is compressed and sheared between the working peripheral surfaces 9 on the outer circumference of each roll. The processing material transferred from the middle roll 3 to the front roll 2 is scraped off by the doctor 19 and collected in a receiving tank (not shown).

The supply bank 5 is formed by closing the spaces on both sides of the rear roll 4 and the middle roll 3 with a weir plate 6. As shown in FIGS. 2 and 3, each roll has a seal circumference having a diameter smaller than that of the working peripheral surface 9 via a vertical end surface 10 on the side of the working peripheral surface 9 for compressing and shearing the treated material. A surface 11 is formed, and the lower end portion 7 of the weir plate 6 faces an inner surface 20 facing the vertical end surface 10 of the rear roll 4 and the middle roll 3 and a curved surface 8 having a shape in contact with the seal peripheral surface 11. Is formed. Then, the curved surface 8 is placed on the roll so as to be in sliding contact with the peripheral surface 11 of the seal and the inner side surface 20 is in sliding contact with the vertical end surface 10. A pressure receiving portion 13 is provided in a lower portion located between the rolls along the side center line 18 of the weir plate 6. The pressure receiving portion 13 is composed of an inclined surface 12 that is inclined so that the plate thickness of the lower portion is thick and the plate thickness of the upper portion is thinner than that.

The roll mill main body 1 is provided with a pressurizing device 22 having a pressurizing shaft 21 for pressurizing the weir plate 6. The pressurizing device 22 shown in FIG. 4 is a hydraulic pressurizing device at a position where the hydraulic cylinder 24 for driving the piston 23 connected to the pressurizing shaft 21 faces the side center line 18 of the weir plate 6. It is fixed to the roll mill body 1. The hydraulic cylinder 24 has a supply port 25 for supplying pressurized oil into the cylinder and an outlet 26 for flowing out, and a piston rod connected to the piston 23 serves as a pressure shaft 21, and a pressing body 27 is at the tip thereof. It is provided. The pressing body 27 is provided on a support plate 28 fixed to the pressure shaft 21, a bearing housing 29 fixed to the support plate 28, a needle-shaped roller bearing 30 provided in the housing 29, and a front portion of the housing. It includes a thrust bearing 31, a rotating shaft 32 that is rotationally supported by the bearing, and a pressing head 33 that is attached to the tip of the rotating shaft 32. The pressing head 33 has an annular contact portion 34 whose base portion is substantially disk-shaped and whose tip portion is formed in the shape of a conical cone and which is inclined toward the outer peripheral edge side, and the corresponding contact portion 34 is inclined to the pressure receiving portion 13. It is designed to come into contact with the surface 12. Since the pressing head 33 is rotatable, when the pressure receiving portion 13 moves in the front-rear direction of the roll mill main body 1, the contact portion 34 can rotate and move following the movement of the pressure receiving portion 13.

According to the above configuration, when the lower end portion 7 of the weir plate 6 is applied to the vertical end surface 10 of the roll and the peripheral surface 11 of the seal and the pressurizing device is driven, the pressurizing shaft 21 advances straight and the pressing head 33 of the pressing body 27 moves. The contact portion 34 comes into contact with the pressure receiving portion 13 of the weir plate 6, and the center of the side surface of the weir plate 6 is pressed in the direction of the vertical end surface of the roll and the direction of the sealing surface by the component force action of the inclined surface 12, and the weir plate 6 is crimped. , Leakage of treated material can be prevented (see FIG. 5). Then, when the rear roll 4 and the middle roll 3 are moved in the direction of the front roll 2, the weir plate 6 and the pressure receiving portion 13 also move. The maximum is about 1.2 mm. Therefore, as shown in FIG. 6, a maximum positional deviation L of 1.2 mm occurs between the side center line 18 of the weir plate 6 and the center of the pressurizing shaft 21, but the pressing head 33 of the pressing body 27 rotates. Since the weir plate 6 follows the movement of the weir plate 6, the side center line 18 portion of the weir plate 6 is pressed by the contact portion 34 of the pressing head 33 even after the movement, and the weir plate 6 is pressed by the roll almost evenly. As a result, leakage can be prevented without causing uneven wear as in the past. In addition, the dam is not damaged and the maintenance of the dam is easy.

In the above embodiment, hydraulic pressure is used as the pressurizing device, but other hydraulic pressure, pneumatic pressure, spring pressure, electromagnetic device and the like may be used. Further, in the above embodiment, the pressing head is formed in a substantially vertical cone shape, but it can also be formed in a substantially disk shape or in a substantially fan shape having a contact portion in a part thereof.

1 Roll mill body 6 Weir plate 9 Working peripheral surface 10 Vertical end surface 11 Seal peripheral surface 13 Pressure receiving part 21 Pressurizing shaft 22 Pressurizing device 27 Pressing body 32 Rotating shaft 33 Pressing head 34 Contact part

Claims (4)

In a roll mill in which a seal peripheral surface is formed on the side of the peripheral surface of the roll via a vertical end surface, and the lower end of the weir plate is pressed against the vertical end surface and the peripheral surface of the seal to form a supply bank, the side surface of the weir plate is formed. An inclined surface is formed in the pressure receiving portion provided in the center, a pressurizing shaft is provided in the roll mill main body facing the pressure receiving portion of the weir, and a vertical cone-shaped pressing head is provided at the tip of the pressurizing shaft. An annular contact portion inclined toward the outer peripheral edge is formed on the peripheral edge of the head, and when the pressure receiving portion moves in the front-rear direction of the roll mill body by contacting the contact portion of the pressing head with the inclined surface of the pressure receiving portion. A roll mill characterized in that the pressing head is rotatably connected to a pressurizing shaft so that the abutting portion rotates and moves following the movement of the pressure receiving portion. The roll mill according to claim 1 , wherein the pressing head is supported by a pressure shaft via a needle roller bearing with a thrust ball bearing. The pressing body for holding the pressing head includes a support plate fixed to the tip of the pressurizing shaft, a bearing housing fixed to the supporting plate and holding a needle roller bearing with a thrust ball bearing, and the pressing supported by the bearing. The roll mill according to claim 2 , wherein the roll mill includes a rotating shaft to which a head is attached. The roll mill according to any one of claims 1 to 3 , wherein the roll mill is a front roll fixing type three-roll mill in which the front roll is fixed and the rear roll and the middle roll can be moved in the front roll direction.

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