JP5290900B2 - Roll mill equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roll mill apparatus which evenly disperses particles in a paste-like material, the roll mill apparatus sufficiently scraping out the paste-like material even if the film thickness of the paste-like material is extremely thin, thereby increasing productivity. <P>SOLUTION: A blade apparatus 44 comprises a pair of gathering blades 47 and a scraping blade 48. An elastic body joined to the end of the pair of the gathering blades 47 is pressed to the surface of an apron roll, the gathering blades 47 is downward tilted along an outer periphery of the apron roll. Such a configuration gathers the paste-like material 200 in contact with the gathering blades 47 to the center side along the slope of the gathering blades 47. Thus, the film thickness t of the paste-like material 200 is increased from normal one at the center of the apron roll 24, the paste-like material 200 can be effectively scraped by the scraping blade 48, to thereby increase the productivity. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a roll mill apparatus that uniformly disperses particles in a paste-like material, and particularly relates to an improvement in productivity when uniformly forming fine particles having a small particle diameter.

  Conventionally, for example, electronic pastes such as insulating pastes, conductive pastes, phosphor pastes, glass pastes, fine ceramics such as automobile electrical ceramics and ceramics for electronic substrates, printer inks, porcelain coloring inorganic pigments, lacquers, etc. When manufacturing pharmaceuticals such as pigments, inks, squid ink and ointment, roll mill devices such as a three-roll mill device with multiple rolls are used for the purpose of kneading and dispersing pastes and viscous fluids. ing.

  The above three roll mill device is composed of three substantially cylindrical rolls (start roll (feed roll), intermediate roll (center roll)), end point, which are arranged in parallel so as to be rotatable around mutually parallel axes. A roll (apron roll)), and the paste-like material supplied on the starting point roll is scraped off from the surface of the end point roll by a blade (scraper) and collected. These three rolls are set so that the rotation directions of the adjacent rolls are different from each other, and the rotation speed increases from the supply side of the paste-like material toward the recovery side.

  For this reason, when the paste-like material is supplied onto the starting roll, the compressive action and the shearing action act in the gap between the starting roll and the intermediate roll, so that the agglomerated particles are broken and dispersed. At the same time, the paste-like material moves to the surface of the intermediate roll having a relatively high rotational speed. Next, the paste-like material is similarly subjected to compression action and shearing action in the gap between the intermediate roll and the end roll to further improve dispersibility, and moves to the end roll surface having a relatively high rotational speed. The pasty material that has moved to the surface of the end roll is scraped and collected by a blade (scraper) pressed against the surface at a position opposite to the intermediate roll.

  The three roll mill apparatus of patent document 1 is the example. In Patent Document 1, when paste leakage occurs from the roll end, the paste leakage is detected, and the mixing of poorly dispersed paste from the roll end by adjusting the roll rotation speed, roll gap, roll clamping pressure, etc. The technology that improves the production efficiency by eliminating the wiping and cleaning of the paste scattered from the end of the roll is disclosed.

JP 2006-247482 A JP 2008-155108 A JP-A-6-302969

  By the way, in the roll mill apparatus including Patent Document 1, for example, as the size (particle diameter) of the particles to be homogenized, such as ultrafine particles of 1 μm or less, becomes smaller, the gap between the intermediate roll, the start roll, and the end roll is set respectively. It is necessary to make it small, and as a result, the film thickness of the paste-like material that moves to the outer peripheral surface of the end point roll becomes thin. In this case, there is a problem that productivity is reduced due to the influence of the minute unevenness on the roll surface and the gap generated at the blade tip that scrapes the paste-like material from the end roll (apron roll), which prevents sufficient scraping. .

  The above situation will be described in more detail with reference to the drawings. FIG. 14 schematically shows a state in which the tip of the blade 300 is pressed against the end point roll 302. Note that FIG. 14 is an exaggerated view than the actual state in order to explain the processing error of the end point roll 302, but in reality it is a very small error. As shown in FIG. 14, the end point roll 302 is not formed in a perfect circular state, but has an elliptical shape. Therefore, when the maximum outer diameter Dmax and the minimum outer diameter Dmin of the end point roll 302 are compared, a dimensional difference ΔD (= Dmax−Dmin) of about 0.01 mm (10 μm) or less occurs. Accordingly, when the end point roll 302 rotates 90 degrees from the state of FIG. 14, a gap is generated between the end point roll 302 and the blade 300, so that the paste-like material 200 is not scraped well by the blade 300 and passes through the blade 300. End up. Further, since the end point roll 302 is also distorted due to a processing error in the axial direction, the thickness (film thickness) of the paste-like material 200 on the end point roll 302 is not constant, and an error also occurs at the tip of the blade 300. Therefore, no matter how much the contact between the end point roll 302 and the blade 300 is adjusted, the scraping yield of the pasty material 200 by the blade 300 decreases as the film thickness of the pasty material 200 on the end point roll 302 decreases. To do.

  For example, as shown in FIG. 15, when the film thickness t of the paste-like material 200 transferred to the outer peripheral surface of the end point roll 302 is thick, even if the tip of the blade 300 is somewhat worn, the blade 300 scrapes a sufficient amount. Is possible. On the other hand, as shown in FIG. 16, when the film thickness t of the paste-like material 200 transferred to the outer peripheral surface of the end point roll 302 becomes thin, the paste-like material 200 passes through the blade 300 when the tip of the blade 300 is worn. Since the ratio increases, the scraping yield by the blade 300 decreases.

  Further, even during roll operation, since irregularities on the roll surface and gaps at the blade tip are generated due to chipping of the roll surface and blade tip, sufficient measures cannot be taken in advance confirmation or adjustment during initial operation. In addition, since the above is a specific problem that occurs when a paste-like material containing ultrafine particles having a small particle size is uniformly dispersed, the roll mill apparatus including Patent Document 1 has a solution to that problem. No law is described.

  The present invention has been made against the background of the above circumstances, and the object of the present invention is to provide a roll mill apparatus that uniformly disperses particles in the paste-like material, and the paste-like material has a very thin film thickness. An object of the present invention is to provide a roll mill apparatus that can be scraped sufficiently even in a state and can improve productivity.

  In order to achieve the above object, the gist of the invention according to claim 1 is that (a) a rotatable cylindrical starting point roll around one axis and a rotation around an axis parallel to the starting point roll A cylindrical end roll that is possible, and at least one cylindrical intermediate roll that is interposed between the start roll and the end roll and is rotatable about an axis parallel to each roll, and the end roll A roll mill device that scrapes off the pasty material transferred to the outer peripheral surface of the end roll, and (b) the blade device removes the pasty material adhering to the outer peripheral surface of the end point roll. And a scraping blade that scrapes off the paste-like material gathered by the gathering blade, and (c) the tip edge of the gathering blade is in contact with the end roll. There, characterized in that it is joined along tip edge.

  According to a second aspect of the present invention, in the roll mill device according to the first aspect, the approach blade is directed toward an end portion on the side close to the scraping blade in the axial direction of the end roll. The end roll is inclined downward along the rotation direction of the outer peripheral surface of the end roll.

  According to a third aspect of the present invention, there is provided the roll mill apparatus according to the second aspect, wherein the moving blades are separately disposed on both end sides in the axial direction of the end roll, and the scraping blade. Is positioned on the outer peripheral surface of the end point roll on the downstream side of the advancing blade, and both ends of the end point roll in the circumferential direction of the end point roll overlap with the end portion on the side close to the scraping blade. It is arranged.

  According to a fourth aspect of the present invention, in the roll mill apparatus according to the third aspect, the length of the scraping blade in the axial direction of the end roll is the length in the axial direction of the end roll. Is set to 1/3 or less.

  The gist of the invention according to claim 5 is that, in the roll mill device according to any one of claims 2 to 4, the vertical height at which the leading blade is inclined is equal to the roll radius of the end roll. On the other hand, it is set to 1/3 or less.

  According to the roll mill device of the invention according to claim 1, the blade device is moved by the moving blade that moves the pasty material adhering to the outer peripheral surface of the end point roll in the axial direction of the end point roll, and the moving blade. A scraping blade that scrapes off the pasty material, and an elastic body that contacts the end point roll is joined to the leading edge of the leading blade along the leading edge. In this way, the paste-like material moved in the axial direction by the moving blade increases in film thickness, and the paste-like material is effectively scraped off by the scraping blade in the state where the film thickness is increased. Become. Therefore, productivity improves as the scraping amount increases. In addition, since the elastic body is joined along the leading edge of the shifting blade, the gap formed between the shifting blade and the outer peripheral surface of the end roll is also closed by the elastic body, so the paste that passes through the shifting blade There is almost no material in the form of a paste, and the paste-like material is brought to the axial direction without waste. As a result, the scraping amount of the pasty material scraped by the scraping blade is further increased, and the productivity is improved.

  For example, in the case of fine particles having a very small particle diameter, the gap between the rolls is set small, so that the film thickness of the paste-like material that moves to the outer peripheral surface of the end roll becomes thin, and the conventional blade can be scraped off sufficiently. Without increasing the paste-like material passing through the blade, the productivity is lowered. On the other hand, by configuring the blade as described above, even if the film thickness of the paste-like material is very thin, the film thickness increases when scraping with the scraping blade, The pasty material is effectively scraped off. Therefore, even when dealing with fine particles having a small particle size, it is possible to suppress a decrease in productivity.

  Further, according to the roll mill device of the invention according to claim 2, the approach blade is arranged on the outer peripheral surface of the end point roll as it approaches the end portion on the side close to the scraping blade in the axial direction of the end point roll. Since it is inclined downward along the rotation direction, the paste-like material is automatically moved toward the scraping blade along the inclination of the closing blade.

  Further, according to the roll mill device of the invention according to claim 3, the shifting blades are separately disposed on both end sides in the axial direction of the end point roll, and the scraping blade is an outer peripheral surface of the end point roll. It is positioned on the downstream side of the above-mentioned approaching blade, and both ends thereof are arranged so as to overlap with the end of the approaching blade adjacent to the scraping blade in the circumferential direction of the end-point roll. The paste-like material thus moved moves toward the scraping blade, and the thickness of the paste-like material increases when the paste-like material is scraped off by the scraping blade. Therefore, the amount of the paste-like material scraped off by the scraping blade increases, so that productivity is improved.

  According to the roll mill device of the invention according to claim 4, the axial length of the end point roll of the scraping blade is set to 1/3 or less of the axial length of the end point roll. Therefore, the paste-like material can be efficiently scraped by the scraping blade as the paste-like material is brought closer to the center side by the gathering blade and the film thickness of the paste-like material at the center of the end point roll increases. it can. Moreover, since the length of the scraping blade in the axial direction is shortened, it becomes easy to uniformly press the tip of the scraping blade. Furthermore, since the length in the axial direction of the scraping blade is shortened with respect to large waviness-like processing variations in the axial direction of the end roll, there is a gap between the tip of the scraping blade and the outer peripheral surface of the end roll. Less likely to occur. Therefore, productivity is further improved.

  According to the roll mill device of the invention according to claim 5, the vertical height at which the moving blade is inclined is set to 1/3 or less with respect to the roll radius of the end roll. It is possible to apply a roll pressing pressure evenly along the outer peripheral surface of the end point roll to the front end portion (elastic body). Therefore, since the roll pressing pressure is evenly applied from the outer peripheral surface of the end roll toward the shaft center, the reaction force of the paste-like material on the outer peripheral surface of the end roll causes the tip (elastic body) of the moving blade to be pushed up to form a gap. Since it is difficult to remove, scraping leakage is further reduced.

It is a front view which shows the whole three roll mill of one Example of this invention. It is a left view which shows the whole three roll mill of FIG. It is a right view which shows the whole three roll mill of FIG. It is a top view which shows the whole three roll mill of FIG. It is a rear view which shows the whole three roll mill of FIG. It is a figure explaining a drive mechanism in the VI-VI cross section of FIG. It is a figure explaining a drive mechanism in the VII-VII view section of FIG. It is the calculation result which computed the change of the discharge amount (discharge volume) by the film thickness and scraping yield of a three roll mill apparatus. It is an example which shows the state of the paste-form material in operation of a 3 roll mill apparatus. It is a figure explaining the structure of a closing blade. It is a figure which shows the structure of a blade simply. It is the arrow line view which looked at FIG. 11 from the arrow A direction. It is a figure explaining the thickness gauge which measures the film thickness of a paste-form material. It is a figure explaining the processing error of an apron roll. It is a figure which shows the state which scrapes off the paste-form material which transfers to an apron roll with a blade. It is a figure which shows the state which scrapes off the paste-form material which transfers to an apron roll with a blade, Comprising: The case where the film thickness of a paste-form material is especially thin is shown.

  Here, it is preferable to use, for example, polyurethane rubber, silicon rubber, ethylene / propylene / diene copolymer (EPDM), or the like as the elastic body to be joined to the tip portion of the leading blade.

  Preferably, the rotation speed of the intermediate roll is set higher than the rotation speed of the start roll, and the rotation speed of the end roll is set higher than the rotation speed of the intermediate roll. In this way, a shearing action is generated based on the difference in rotational speed between the rolls, and particles are dispersed or crushed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the drawings are appropriately simplified or modified, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  FIG. 1 is a front view showing an entire three-roll mill device 10 (the roll mill device of the present invention) to which the present invention is applied, and FIGS. 2 to 5 are a left side view, a right side view, a plan view, and a rear surface, respectively. FIG. In these drawings, a three-roll mill device 10 includes a drive mechanism portion 14 provided with a drive motor 12 therein, a pair of leg portions 16 and 16 for supporting the drive mechanism portion 14 at both left and right ends in FIG. 1, and a drive mechanism portion. 14, three rolls supported at both ends by each end, that is, a cylindrical feed roll 20 that can rotate around a single axis, and a cylindrical apron roll 24 that can rotate around an axis parallel to the feed roll 20. And a cylindrical center roll 22 that is interposed between the feed roll 20 and the apron roll 24 and is rotatable around an axis parallel to the rolls 20 and 24. In this embodiment, the apron roll 24 corresponds to the end roll, the feed roll 20 corresponds to the start roll, and the center roll 22 corresponds to the intermediate roll.

  Each of the leg portions 16 has an inverted U shape in which both left and right end portions in FIGS. 2 and 3 protrude downward, and a wheel 26 and a fixed leg are respectively provided at the lower end portions of the four protruding portions. 28 is provided. FIG. 1 and the like show a state in use in which the fixed leg 28 protrudes slightly downward from the wheel 26. When the three-roll mill device 10 is moved, the wheel 26 is slightly protruded downward in accordance with the operation of a cylinder (not shown) provided in the leg portions 16 and 16.

  The upper end portion of the drive mechanism portion 14 is provided with bearing portions 30 and 32 protruding upward above the leg portions 16 and 16. The three rolls 20, 22, 24 are supported at both ends by these bearing portions 30, 32 in a state where the three rolls 20, 22, 24 can rotate about their respective axes. Further, the bearing portions 30 and 32 are respectively provided with pressure device operation handles 34 at both ends in the left-right direction in FIGS. 2 and 3, and a pressure gauge 36 is provided in the vicinity thereof. The pressurizing device operation handle 34 changes the axial center distance between the three rolls 20, 22, 24 by operating an internal mechanism which will be described later, and the mutual distance between the rolls 20, 22, 24 or their mutual pressing. It is for adjusting the pressure. The pressure gauge 36 is provided for displaying the pressing pressure.

  The rolls 20, 22, and 24 are made of, for example, a stainless steel (SUS) cylinder. Further, instead of stainless steel, it may be made of a cylinder made of alumina ceramic. However, when each roll 20, 22, 24 has a relatively large external dimension, it becomes difficult to manufacture from alumina ceramic. Steel is preferred. Between the feed roll 20 and the center roll 22, a pair of weir plates 38, 38 having a substantially pentagonal shape and having a lower end surface substantially along the surface of the rolls 20, 22, has the rolls 20, 22. Are provided at both ends. These barrier plates 38 and 38 are for suppressing the input paste-like material 200 from spreading more than necessary in the axial direction of the rolls 20 and 22. As shown in FIGS. 1 to 3, a dam plate support device 40 is provided on the drive mechanism unit 14. The dam plate support device 40 includes guide bars 42 extending above the rolls 20 and 22 in the axial direction thereof, that is, in the left-right direction in FIG. 4, and the dam plates 38 and 38 are provided by the dam plate support device 40. The rolls 20 and 22 are suspended at arbitrary positions in the axial direction.

  Further, on the opposite side of the apron roll 24 from the center roll 22, a blade device 44 (scraper) is provided as shown in FIGS. The blade device 44 of the present embodiment is a device for scraping off the paste-like material 200 transferred to the outer peripheral surface of the apron roll 24, and as shown in FIG. 5, in the axial direction (width direction) of the apron roll 24. It is comprised from a pair of approaching blade 47 arrange | positioned at both ends, and the scraping blade 48 arrange | positioned in the center of the axial center direction (width direction) of the apron roll 24. FIG. A pair of holding screws 46, 46 are provided at both ends of the blade device 44, and the leading end portions of the leading blade 47 and the scraping blade 48 are pressed against the surface of the apron roll 24 by screwing them. . The blade device 44 has a length dimension that is larger than the axial length of the cylindrical outer peripheral surface of the apron roll 24 so that the blade device 44 is pressed against the outer peripheral surface over the entire length of the apron roll 24 in the axial direction. Slightly longer.

  Further, below the blade device 44, a cradle 50 having a horizontal receiving surface is fixed to the wall surface of the drive mechanism unit 14 by screws or the like. The blade device 44 is for scraping and collecting the pasty material on the apron roll 24, and a container (not shown) for receiving the scraped material is placed on the cradle 50.

  Further, a switch box 56 having a start button 52 and a stop button 54 is attached to the side surface of the bearing portion 32 located on the right side in FIG. As shown in FIG. 2 and the like, a similar switch box 58 is also provided on the bearing side 32 on the back side, and can be started and stopped from either the front side or the back side.

  Further, an emergency stop button 60 is provided on the upper surface of the bearing portion 30 located on the left side in FIG. As shown in FIGS. 3 and 5, a similar emergency stop button 62 is provided on the rear side. Therefore, the emergency stop operation can be performed from either the front side or the back side, as in the normal start and stop operations.

  Further, a transparent cover 64 is attached above the rolls 20, 22, and 24 to cover them. The portion of the cover 64 that is directly above the gap between the feed roll 20 and the center roll 22 is cut out into a substantially rectangular shape, and the substantially rectangular hole 66 is provided as a material inlet as described later. It is closed by a lid 68 that can be lifted and opened. In addition, the said dam plates 38 and 38 are arrange | positioned outside the said material insertion port 66, for example.

  Further, a water supply / drainage mechanism 70 for cooling the rolls 20, 22, 24 is provided on the side surface of the bearing portion 30 located on the left side in FIG. 1. Each of the rolls 20, 22, and 24 has a hollow cylindrical shape, and is cooled by supplying cooling water to the inside through the water supply hoses 72, 74, and 76 (see FIG. 2) of the water supply and drainage mechanism 70. It is like that. The supplied cooling water is discharged through the drain hose 78. In addition, although the drainage hose is provided with respect to each of the rolls 20, 22, and 24 similarly to the water supply hose, only one front is shown in FIG. The amount of water supplied from the water supply hoses 72, 74, 76 can be adjusted individually by the liquid amount adjusting valves 80, 82, 84. By adjusting the amount of water supplied to each roll 20, 22, 24, the roll temperature can be increased. It is possible to suppress the increase in the temperature of the processing material.

  1, 4, and 5, 86 is a control panel in which a control circuit, a switch, a meter, and the like are accommodated. The manual operation handle 88 shown in FIGS. 2 and 3 is attached by being inserted from the insertion port 90 shown in FIG. 3 as necessary. When removing foreign matter or cleaning, the handle 88 is used. The rolls 20, 22, and 24 can be manually rotated by a necessary amount.

  As shown in FIGS. 1 and 5, a tray 92 is provided below the rollers 20, 22, and 24. The processing material dropped from between the rolls 20 and 22 or between the rolls 22 and 24 is received by the tray 92.

  As shown in FIGS. 1 and 2, a timing belt 96 is wound around the drive pulley 94 of the drive motor 12, and the driven pulley of the reduction gear whose rotation is larger than that of the drive pulley 94. 98. As will be described later, the rollers 20, 22, and 24 are rotated by the rotation of the drive motor 12 being transmitted via a speed reducer.

  1 and 2, the water supply hoses 72, 74, and 76, the drainage hose 78, and the like are connected to the rotation shafts of the rollers 20, 22, and 24 by rotary joints 104, 106, and 108, respectively.

  FIG. 6 shows a main part of the section taken along the line VI-VI in FIG. 2, and the water supply / drainage mechanism 70, the control panel 86, the legs 16, 16 and the cover 64 are omitted. In FIG. 6, the driven pulley 98 is fitted to one end of the shaft 110 in the bearing portion 30. The shaft 110 is supported at both ends by a bearing unit 112, 112 so as to be rotatable around its axis, and a first gear 114 having a smaller diameter than the driven pulley 98 is fitted to the other end. The first gear 114 is meshed with a second gear 118 fitted to the first shaft 116 of the apron roll 24.

  The apron roll 24 has a pair of flanges 120 and 122 fitted to both ends by a plurality of, for example, four bolts 124. The flange 120 is connected to the first shaft 116, and the flange 122 is connected to the first shaft 116. Are attached to a second shaft 126 provided on the opposite side so as not to rotate relative to each other.

  Further, the first shaft 116 and the second shaft 126 are supported by bearing units 132 and 132 so as to be rotatable around the axis, respectively, and the second shaft 126 has a smaller diameter than the second gear 118. The third gear 134 is fitted.

  Further, the flange 122 is provided with a through hole 136 penetrating in the axial direction thereof, and the flange 120 is provided with a bottomed hole 138 at a corresponding position, and the apron roll 24 has a second shaft. 126 and a through-hole 136 and a water supply pipe 140 having a tip portion positioned in the bottomed hole 138 is provided. The water supply pipe 140 is connected to the water supply hose 76 through the rotary joint 108, and the cooling water supplied from the water supply hose 76 is supplied from the discharge holes provided in the water supply pipe 140 through the apron roll 24. It is discharged inside. The discharged cooling water passes through the gap between the through hole 136 and the water supply pipe 140 and returns to the drainage hose 78 through the through hole in the second shaft 126.

  FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 1, and components provided below the bearing portions 30 and 32 and the rolls 20, 22, and 24 are omitted. FIG. 6 corresponds to the VI view in FIG. In FIG. 7, the center roll 22 has a pair of flanges 142 and 144 fitted to both ends with, for example, four bolts 146, similar to the apron roll 24. The 3rd shaft 148 and the 4th shaft 150 are attached so that relative rotation is impossible. Also, the feed roll 20 has a pair of flanges 152 and 154 fitted to both ends with, for example, four bolts 156, similar to the center roll 22 and the apron roll 24. The fifth shaft 158 and the sixth shaft 160 are attached so as not to rotate relative to each other.

  The third shaft 148, the fourth shaft 150, the fifth shaft 158, and the sixth shaft 160 are supported by bearing units 162, 162, 164, and 164, respectively, so as to be rotatable about the axis. A fourth gear 166 meshed with the third gear 134 is fitted to the third shaft 148, and a fifth gear 168 is fitted closer to the shaft end than the fourth gear 166. The fifth gear 168 has the same outer diameter as the third gear 134, and the fourth gear 166 has a larger diameter.

  A sixth gear 170 meshed with the fourth gear 166 is fitted to the fifth shaft 158 of the feed roll 20. The sixth gear 170 has the same outer diameter as the fourth gear 166. In addition, a rotary encoder 174 is attached to the sixth shaft 160 via a lateral coupling 172 so that the rotational speed of the feed roll 20 can be detected.

  Thus, the rotation of the apron roll 24 is transmitted to the center roll 22 via the small diameter third gear 134 and the large diameter fourth gear 166, and then the rotation of the center roll 22 is reduced to the small diameter fifth gear 168 and It is transmitted to the feed roll 20 through the sixth gear 170 having a large diameter. Therefore, the rotation speed of each roll 20, 22, 24 is decelerated according to the gear ratio, and the rotation speed increases in the order of the feed roll 20, the center roll 22, and the apron roll 24. The rotation speed ratio is set to about 1: 3: 9, for example.

  The feed roll 20 and the center roll 22 are also provided with water supply pipes 176 and 178 so that the feed roll 20 and the center roll 22 can be supplied and drained into the roll through the third shaft 148 and the fifth shaft 158 in the same manner as the apron roll 24. .

  In addition, pinions 182 are fitted on the tip portions of the shafts 180 to which the handles 34 are respectively attached. The pinion 182 is meshed with a pinion 188 that is screwed to the screw shaft 186 of the slider device 184, and the screw shaft 186 moves in the vertical direction (perpendicular to the rotation axis) in the drawing as the pinion 188 rotates. When moving back and forth, the bearing units 132 and 164 fixed to the slider device 184 move in the same direction. Thereby, the space | interval of the axial center of the center roll 22 and the axial center of the feed roll 20 and the apron roll 24 is changed, and the magnitude | size of the clearance gap between rolls and the pressing pressure between rolls are changed. The pressing pressure is detected by oil pressure and displayed on the pressure gauge 36.

  When the three-roll mill device 10 configured as described above is used to disperse and knead paste material such as paste material for ceramic products and ink, the handle 34 is operated to operate the feed roll 20. And the center roll 22 are slightly separated from each other, and the center roll 22 and the apron roll 24 are slightly separated from each other. Next, the cooling water is introduced into the rolls 20, 22, 24 by operating the flow rate adjusting valves 80, 82, 84 of the water supply / drainage mechanism 70, and the rolls 20, 22, 24 are rotated by operating the start button 52. After the rotation starts, the paste-like material 200 is introduced from the material input port 66, and the handle 34 is quickly operated so that the feed roll 20 is pressed against the center roll 22. At this time, the pressure gauges 36 in the vicinity of both the handles 34 on the feed roll 20 side are monitored, and the handle operation amount is adjusted so that the displayed pressure becomes the same.

  When the feed roll 20 is pressed against the center roll 24 in this way, the paste-like material supplied between the feed roll 20 and the center roll 22 is pressed while receiving a shearing force according to the rotational speed difference between them. It is spread or crushed. And it is taken up by the center roll 22 with the high rotational speed, and is stuck to the outer peripheral surface and goes between the center roll 22 and the apron roll 24. After the pasty material reaches the gap between them, the handle 34 on the apron roll 24 side is operated to press the apron roll 24 against the center roll 22. The paste-like material is spread or crushed while receiving a shearing force and taken up to the apron roll 24 side. Then, the paste-like material 200 on the apron roll 24 is scraped by the blade device 44 and collected.

  By the way, when particles having a very small particle diameter, such as ultrafine particles of 1 μm or less, are uniformly dispersed by the three-roll mill device 10, it is necessary to narrow the gap between the center roll 22, the feed roll 20, and the apron roll 24. As a result, the film thickness t of the paste-like material 200 that moves (sticks) to the outer peripheral surface of the apron roll 24 becomes very thin. In such a case, fine scratches on the roll surface and gaps generated at the tip of the blade are affected, and it is difficult to sufficiently scrape the blade with a conventional shape. In particular, as the dimensions of each roll increase, the processing error (roundness, etc.) of each roll also increases, and the gap increases. In addition, since the said clearance gap generate | occur | produces by the chipping, abrasion, etc. of a roll surface and a blade | tip tip even during operation of a three-roll mill apparatus, sufficient measures cannot be taken by prior confirmation or adjustment during initial operation. Therefore, when the paste-like material 200 passes through the gap between the apron roll 24 and the blade, the scraping amount by the blade is reduced, and the productivity of the three-roll mill device is lowered.

FIG. 8 shows a calculation of the change in the discharge amount (discharge volume) M (mm ³ / min) depending on the film thickness t and the scraping yield η (%) of the three-roll mill device 10. Here, the discharge amount M and the scraping yield η are defined based on the dimensions shown in FIG. 9 and the following expressions (1) and (2). Specifically, R is the roll radius of the apron roll 24, v is the rotation speed (rpm) of the apron roll 24, and t2 is transferred to the outer peripheral surface of the apron roll 24 through the gap between the center roll 22 and the apron roll 24. The thickness (mm) of the pasty material 200 to be performed, t3 the thickness (mm) of the pasty material 200 remaining on the apron roll 24 after passing through the blade, and W the roll width of the apron roll 24, respectively. Yes.

M = 2π × R × v × (t2−t3) × W (1)
η = (t2−t3) / t2 (2)

  As shown in FIG. 8, the discharge amount M decreases as the film thickness t of the paste-like material 200 decreases. In other words, the productivity decreases as the film thickness t of the paste-like material 200 decreases.

  When the film thickness t is reduced and the paste-like material 200 passing through the blade is increased, it passes through the gap between the center roll 22 and the apron roll 24 again, and a part thereof is further returned to the feed roll 20 side and redispersed. Therefore, as the productivity of the paste-like material 200 decreases, the number of times the particles in the paste pass through each roll gap tends to be non-uniform, and the particle size distribution is affected. Further, the balance between the supply amount of the paste-like material 200 to the three-roll mill device 10 and the scraping amount by the blade device 44 is lost, and there is a possibility that it leaks left and right beyond the weir plate 38.

  On the other hand, as described above, the blade device 44 of the present embodiment includes a pair of leading blades 47 disposed separately at both ends in the axial center direction (width direction) of the apron roll 24 and the shaft of the apron roll 24. It comprises a scraping blade 48 disposed so as to be positioned downstream of the pair of leading blades 47 in the center in the center direction. The shifting blade 47 is for moving the paste-like material 200 adhering to the outer peripheral surface of the apron roll 24 in the axial direction (the scraping blade 48 side) of the apron roll 24. As shown in FIG. A main body portion 47a made of steel or the like and a tip edge of the leading blade 47 are composed of a tip portion 47b that contacts the apron roll 24, and is formed in a longitudinal shape. The tip portion 47b is made of an elastic body such as polyurethane rubber, silicon rubber, ethylene / propylene / diene copolymer (EPDM), and is joined along the tip edge of the main body portion 47a by, for example, vulcanization adhesion. The scraping blade 48 is for scraping off the paste-like material 200 gathered by the gathering blade 47. The scraping blade 48 is made of, for example, stainless steel, and the tip portion pressed against the apron roll 24 is detachable such as alumina ceramic. Consists of the body. That is, the basic structure of the scraping blade 48 is the same as the conventional one.

  FIG. 11 is a diagram simply showing the arrangement state of the blade device 44, and corresponds to the rear view of FIG. FIG. 12 is an arrow view of FIG. 11 viewed from the direction of arrow A. As shown in FIG. 11, the shifting blade 47 is separately disposed on both ends with respect to the axial direction (width direction) of the apron roll 24, and the scraping blade 47 is disposed on the outer peripheral surface of the apron roll 24. The apron roll 24 is disposed on the downstream side of the shifting blade 47 and is disposed so that both ends thereof overlap with the end portion of the shifting blade 47 on the side close to the scraping blade 48. Further, the approaching blade 47 moves downward (downstream) along the rotational direction of the outer peripheral surface of the apron roll 24 toward the end (center) side close to the scraping blade 48 in the axial direction of the apron roll 24. It is pressed against the surface of the apron roll 24 in an inclined state. Therefore, as shown in FIG. 12, the leading edge 47 b made of an elastic body such as polyurethane rubber is pressed along the outer peripheral surface of the apron roll 24. Then, the end portion on the center side of each shifting blade 47 is close to both ends of the scraping blade 48.

  Here, the length W2 (blade width W2) in the axial direction of the apron roll 24 of the scraping blade 48 is 1/2 or less with respect to the length W1 (full width W1) in the axial direction of the apron roll 24, desirably Is set to 1/3 or less. By setting the dimensions as described above, the blade width W2 of the scraping blade 48 is shortened, and it becomes easy to uniformly press the blade tip against the outer peripheral surface of the apron roll 24. Further, since the blade width W2 is short with respect to large waviness-like machining variations in the axial direction of the apron roll surface, a gap between the tip of the scraping blade 48 and the apron roll surface is less likely to occur. Also, the vertical height H (vertical height H) at which the leading blade 47 is inclined as shown in FIG. 12 is ½ or less, preferably 以下 or less of the roll radius R of the apron roll 24. Is set. With this setting, when the elastic body of the tip portion 47b of the leading blade 47 is pressed against the apron roll 24, the roll pressing pressure tends to be equalized. Therefore, since the roll pressing pressure is evenly applied from the outer peripheral surface of the apron roll 24 toward the axial center, the elastic body at the tip of the leading blade is pushed up by the reaction force from the paste-like material 200 on the outer peripheral surface of the apron roll 24. Since it becomes difficult to form a gap, scraping leakage is further reduced. If the vertical height H exceeds ½ of the roll radius R, it becomes difficult to design by dividing the shifting blade 47 or requiring complicated three-dimensional processing. Therefore, it is difficult to press the tip 47b. It becomes easy to become uniform, and the paste-like material 200 that passes through the tip 47b and turns to the back side of the apron roll 24 is likely to increase. Accordingly, the paste material 200 is not sufficiently scraped off by the blade device 44, and the number of times of passing through the gaps between the rolls of the three-roll mill device 10 is increased.

  When configured as described above, the tip portion 47b of the moving blade 47 is made of an elastic body, and therefore, the gap formed between the outer peripheral surface of the apron roll 24 and the moving blade 47 is blocked by the elastic body. The contact blade 47 is pressed against the surface of the apron roll 24 with substantially no gap. Therefore, since the gap is closed, there is almost no pasty material 200 passing through the gathering blade 47, and it is brought toward the scraping blade 48 side (center side) along the inclination of the gathering blade 47. Accordingly, the film thickness t of the pasty material 200 scraped by the scraping blade 48 becomes thicker than usual, so that the pasty material 200 is effectively scraped off by the scraping blade 48. For example, when the length W2 (blade width W2) in the axial direction of the scraping blade 48 is equal to or less than ½ of the total width W1, the film thickness t of the paste-like material becomes about twice, and the axial length W2 Becomes 1/3 or less, the film thickness t becomes about three times, the film thickness t increases, and the scraping yield by the scraping blade 48 increases.

Specific examples will be described below.
The specific shape of the three-roll mill apparatus 10 was such that the roll radii R of the rolls 20, 22, and 24 were 4.5 inches (114.3 mm), respectively, and the rotation speed ratio was 1: 3: 9. Specifically, the feed roll 20 was 10 rpm, the center roll 22 was 30 rpm, and the apron roll 24 was 90 rpm. The roll width W of each roll is set to 700 mm, and the length W2 (blade width) in the axial direction of the scraping blade 48 is set to 1/3 or less (specifically, 200 mm) of the roll width W. .

  The paste-like material 200 of this example is composed of nickel ultrafine powder 45% by weight, ethylcellulose 4% by weight, terpineol 36% by weight, and glass powder 15% by weight. Ethylcellulose is dissolved in terpineol to form a binder solution. Further, the glass powder is used after being pulverized to about 1 μm by a ball mill. Then, each of the above materials was stirred for 1 hour by a planetary mixer and then supplied from the material input port 66 of the three-roll mill device 10.

  In this example, the thickness t of the scraping part, that is, the thickness t2 of the apron roll 24 was adjusted to 10 μm, and the roll discharge amount M was measured for each of the conventional blade and the blade device 44 of the present invention. . Here, the blade having a conventional shape corresponds to a shape in which the elastic member is not joined to the tip of the blade and the blade is pressed over the entire width of the apron roll 24. In other words, it corresponds to a shape in which the scraping blade 48 of this embodiment is extended to both ends of the apron roll 24. Further, in the blade device 44 of this embodiment, for example, the approaching blade 47 having a hardness of about 80 is pressed against the apron roll 24 with an inclination angle θ of 5 degrees (see FIG. 11) with respect to the axis of the apron roll 24. It was.

  Here, the film thicknesses t2 and t3 necessary for calculating the scraping yield η were measured by a thickness gauge 190, for example. In the thickness gauge 190, as shown in FIG. 13, a plurality of grooves having different depths are formed at one end of a rectangular plate. The depth of each groove corresponds to the numerical value displayed in FIG. When the end face on which the groove of the thickness gauge 190 is formed is pressed against the paste-like material 200 that moves to the outer peripheral surface of the apron roll 24, the thickness t of the paste-like material 200 is displayed on the thickness gauge 190. In the groove exceeding the numerical value, the paste-like material 200 adheres to the bottom of the groove. For example, in FIG. 13, the film thickness t of the paste-like material 200 is 10 μm. From the above, the adhesion state of the paste-like material 200 adhering to the thickness gauge 190 is examined, and the value corresponding to the maximum groove depth among the paste-like material 200 adhering to the bottom is the film thickness of the paste-like material 200. Let t. It should be noted that the thickness gauge 190 may be further finely divided into groove depths. Further, the discharge amount M of the paste-like material 200 was measured by collecting the paste-like material actually scraped off from the blade and measuring its volume. Specifically, the specific gravity of the paste-like material 200 was measured in advance, and the discharge amount (discharge volume) M was calculated from the weight of the collected paste-like material 200.

When a blade having a conventional shape was used, the discharge amount M was 200 mm ³ / min, and the scraping yield η was about 40% (see FIG. 8). On the other hand, when the blade device 44 is used under the same conditions, the discharge amount M is 250 mm ³ / min, and the scraping yield is 45% when converted to the case where the blade device 44 is not used (when a conventional blade is used). As a result, 5% productivity improvement was confirmed (see FIG. 8). That is, it has been confirmed that productivity is improved by using the blade device 44 instead of the conventional blade.

  As described above, according to the present embodiment, the blade device 44 is configured so that the pasty material 200 attached to the outer peripheral surface of the apron roll 24 moves toward the axial direction of the apron roll 24, and A scraping blade 48 that scrapes the pasted material 200 gathered, and an elastic body that contacts the apron roll 24 is joined to the leading edge of the leading blade 47 along the leading edge. is there. In this way, the paste-like material 200 moved in the axial direction by the shifting blade 47 increases the film thickness t, and the scraping blade 48 effectively uses the paste-like material 48 in a state where the film thickness t has increased. It will be scraped off. Therefore, productivity improves as the scraping amount increases. Further, since the elastic body is joined along the leading edge of the shifting blade 47, the clearance formed between the shifting blade 47 and the outer peripheral surface of the apron roll 24 is also closed by the elastic body. There is almost no paste-like material 200 that passes through, and the paste-like material 200 is brought toward the axial direction without waste. Accordingly, the scraping amount of the paste-like material 200 scraped by the scraping blade 48 is further increased, and the productivity is improved.

  Further, according to the present embodiment, the approaching blade 47 is lowered along the rotation direction of the outer peripheral surface of the apron roll 24 toward the end on the side close to the scraping blade 48 in the axial direction of the apron roll 24. Therefore, the paste-like material 200 is automatically moved toward the scraping blade 48 along the inclination of the closing blade 47.

  Further, according to the present embodiment, the shifting blades 47 are separately disposed on both ends of the apron roll 24 in the axial center direction, and the scraping blade 48 is arranged on the outer peripheral surface of the apron roll 24 by the shifting blade 47. Is positioned downstream, and both ends of the apron roll 24 in the circumferential direction are arranged so as to overlap with the end of the abutment blade 47 adjacent to the scraping blade 48, so that the abutment blade 47 attracts them. When the paste-like material 200 moves to the scraping blade 48 side and the paste-like material 200 is scraped off by the scraping blade 48, the film thickness t increases. Therefore, the scraping amount of the paste-like material 200 scraped by the scraping blade 48 is increased, so that productivity is improved.

  Further, according to this embodiment, the length W2 of the scraping blade 48 in the axial direction of the apron roll 24 is set to 1/3 or less of the length W1 of the apron roll 24 in the axial direction. As the paste-like material 200 is moved to the center side by the shifting blade 47 and the film thickness t of the paste-like material 200 at the center of the apron roll 24 increases, the scraping blade 48 efficiently removes the paste-like material 200. Can be scraped off. Further, since the length W2 of the scraping blade 48 in the axial center direction is shortened, it becomes easy to uniformly press the tip portion 47b of the scraping blade 48 against the outer peripheral surface of the apron roll 24. Further, the length W2 in the axial direction of the scraping blade 48 is shortened with respect to large waviness-like machining variations in the axial direction of the apron roll 24, so that the tip of the scraping blade and the outer peripheral surface of the apron roll 24 are reduced. A gap between them is less likely to occur. Therefore, productivity is further improved. Further, as the length W2 of the scraping blade 48 in the axial center direction is shortened, the price of the scraping blade 48 is reduced. For example, an expensive blade with good wear resistance can be used.

  Further, according to the present embodiment, the vertical height H at which the approaching blade 47 is inclined is set to 1/3 or less of the roll radius R of the apron roll 24, so that the outer periphery of the apron roll 24 is rolled. A roll pressing pressure can be applied to the tip end portion (elastic body) 47b of the blade 47 evenly along the surface. Accordingly, since the roll pressing pressure is evenly applied from the outer peripheral surface of the apron roll 24 toward the axial center, the tip portion 47b (elastic body) of the shifting blade 47 is caused by the reaction force of the paste-like material 200 on the outer peripheral surface of the apron roll 24. Is pushed up and it becomes difficult to form a gap, so that scraping leakage is further reduced.

  Further, according to the present embodiment, since the paste-like material 200 is stably scraped off by the blade device 44, in the paste-like material 200, the difference in the number of passes between the rolls is reduced, and the particle size distribution is made uniform. Is done.

  Further, according to the present embodiment, since the paste-like material 200 is stably scraped off by the blade device 44, the paste-like material 200 is prevented from leaking left and right beyond the barrier plate 38.

  Further, according to the present embodiment, when each roll diameter of the three-roll mill device 10 is increased, the processing accuracy is lowered and a gap is easily formed between the surface of the apron roll 24 and the blade device 44. Since the elastic body of the tip portion 47b of the blade 47 is pressed against the surface of the apron roll 24, the gap can be closed even for a slight processing error. Therefore, the paste-like material 200 can be efficiently scraped off by the scraping blade 48.

  As mentioned above, although the Example of this invention was described in detail based on drawing, this invention is applied also in another aspect.

  For example, in the above-described embodiment, the three-roll mill apparatus 10 is configured by the three rolls 20, 22, and 24. However, the present invention is not limited to the three rolls, and the two rolls or the four rolls. The present invention can be applied even to a roll mill apparatus constituted by the above rolls.

  Further, in the above-described embodiment, a gradient is formed at the tip of the leading blade 47, but the above gradient is not necessarily required.

  Further, in the above-described embodiment, the shifting blade 47 and the scraping blade 48 are configured separately, but may be configured integrally.

  In the above-described embodiment, the scraping blade 48 is disposed at the center of the apron roll 24 in the axial center direction, and the shifting blades 47 are disposed at both ends. The blade 48 may be off-centered in one axial direction. Alternatively, for example, the scraping blade 48 may be disposed on one end side in the axial direction of the apron roll 24, and one shift blade 47 may be disposed on the other end side. In other words, the paste-like material 200 is moved in the axial direction by the gathering blade 47 to increase the film thickness t of the paste-like material 200, and the scraping blade 48 is disposed so as to scrape the paste-like material 200. If so, the shapes and number of the approaching blades 47 and the scraping blades 48 can be appropriately changed within a consistent range.

  The above description is only an embodiment, and the present invention can be implemented in variously modified and improved forms based on the knowledge of those skilled in the art.

10: Three roll mill device (roll mill device)
20: Feed roll (starting point roll)
22: Center roll (intermediate roll)
24: Apron roll (end point roll)
44: Blade device 47: Shifting blade 47b: Tip portion (elastic body)
48: scraping blade 200: paste material H: height in the vertical direction R: roll radius of the apron roll (end point roll) W1: length of the apron roll (end point roll) in the axial center direction W2: axis of the scraping blade Length in the direction of the heart

Claims (5)

A cylindrical starting point roll that can rotate around a single axis, a cylindrical end point roll that can rotate around an axis parallel to the starting point roll, and an intermediate between the starting point roll and the end point roll. A roll mill device comprising: at least one or more cylindrical intermediate rolls that can rotate around an axis parallel to the rolls; and a blade device that scrapes off the pasty material transferred to the outer peripheral surface of the end point roll,
The blade device is a squeezing blade that brings the pasty material adhering to the outer peripheral surface of the end point roll toward the axial direction of the end point roll, and a scraping blade that scrapes off the pasty material gathered by the squeezing blade Configured,
An elastic body that contacts the end point roll is joined to the leading edge of the leading blade along the leading edge.   The approach blade is inclined downward along the rotational direction of the outer peripheral surface of the end point roll toward the end on the side close to the scraping blade in the axial direction of the end point roll. The roll mill device according to claim 1. The shifting blades are separately disposed on both end sides in the axial direction of the end point roll,
The scraping blade is positioned on the downstream side of the trailing blade on the outer peripheral surface of the end point roll, and both ends of the trailing blade are adjacent to the scraping blade in the circumferential direction of the end point roll. The roll mill device according to claim 2, wherein the roll mill device is disposed so as to overlap with the portion.   The roll mill device according to claim 3, wherein the length of the scraping blade in the axial direction of the end roll is set to 1/3 or less of the length of the end roll in the axial direction.   The roll mill device according to any one of claims 2 to 4, wherein a vertical height at which the leading blade is inclined is set to 1/3 or less of a roll radius of the end roll.

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