JP2020504071A - Tension roll, apparatus and method for stretching glass ribbon - Google Patents

Abstract

A tension roll for stretching a glass ribbon is disclosed. The pulling roll includes a roll body including a central passage extending longitudinally through the roll body, a shaft extending through the central passage and spaced from the roll body, and movably disposed on the shaft; And a spring configured to push the first flange longitudinally of the shaft.

Description

Cross-reference of related applications

  This application claims priority from Korean Patent Application No. 10-2017-0005315, filed on Jan. 12, 2017, and relies on the contents thereof and provides a complete description thereof. And incorporated herein by reference as if.

  The present disclosure relates to tension rolls, devices and methods for stretching glass ribbon.

  In the glass sheet manufacturing process, tension rolls are used to stretch the glass ribbon to the desired final thickness. For example, a pull roll may be located below the tip or root of the fusion pipe to pull the ribbon, thereby controlling the speed of the ribbon away from the fusion pipe, thereby resulting in the final thickness of the ribbon. To decide.

  Conventional pull rolls include a plurality of compressed ceramic disks stacked longitudinally of the shaft. The disc is locked in place and kept under pressure by a collar on the shaft. The plurality of disks are components for stretching the ribbon in contact with the ribbon and are made of ceramic composites (typically including ceramic fibers, mica, and clay).

  However, such ceramic disks are susceptible to thermal shock and, therefore, tend to emit an excessive number of particles when in contact with hot ribbon glass. These particles can adhere to the surface of the ribbon and create surface defects known as surface inclusions. In particular, if the glass sheet is manufactured as a substrate for a flat panel display, the glass sheet should have no surface deposits. The reason is that each surface deposit becomes a defective area (eg, one or more defective pixels) of the final product (eg, a display panel). Accordingly, there is a need in the art for a pull roll that suppresses or prevents the formation of surface deposits.

  The present disclosure provides tension rolls, devices, and methods for stretching glass ribbon that can suppress or prevent the formation of surface deposits. For example, the tension roll can be made of an impact resistant material, thereby further preventing the formation of surface deposits.

  In one embodiment, a tension roll for stretching a glass ribbon is described, wherein the tension roll has a center passage extending longitudinally through the roll body, and extends through the center passage and from the roll body. The shaft includes a spaced shaft, a first flange movably disposed on the shaft and movable longitudinally of the shaft, and a spring configured to push the first flange longitudinally of the shaft. The spring is a coil spring arranged inside or outside the shaft. A coil spring disposed outside the shaft is extensible while surrounding at least a portion of the shaft. The roll body is a unitary piece and includes a fused silica material. The pull roll may be a full length pull roll or a stub pull roll.

  According to embodiments described herein, the first flange may further include a sleeve slidably engaging the shaft, and a cap extending outwardly from the sleeve. The cap contacts the roll body such that the first flange supports the roll body. The roll body and the cap may include a protrusion and a recess that receives the protrusion. The protrusion and the recess include complementary inclined surfaces that contact each other.

  In some embodiments, the pulling roll may further include a rod disposed inside the shaft to engage the spring, and a pin connecting the first flange to the rod, wherein the shaft comprises a longitudinal axis of the shaft. A pin extending in the longitudinal direction of the shaft within the slot. The pulling roll further includes a second flange fixed on the shaft, and the roll body is disposed between the first flange and the second flange.

  In another embodiment, an apparatus for stretching a glass ribbon is disclosed. The belt-shaped glass stretching device includes at least a pair of first tension rolls, and at least a pair of second tension rolls disposed downstream of the pair of first tension rolls in the stretching direction along the tension path, One pulling roll is the above-described full-length pulling roll, and the second pulling roll is the above-described stub-type pulling roll.

  In yet another embodiment, a method for stretching a glass ribbon is described. The strip glass stretching method includes a step of stretching the strip glass using at least a pair of tension rolls. The pulling roll includes a shaft, a roll body rotatable with the shaft, a movable flange disposed on the shaft and supporting the roll body, and a spring arranged with the shaft and applying a force to the movable flange in the longitudinal direction of the shaft. Wherein the roll body comprises a fused silica material and is spaced from the shaft. The step of stretching includes moving the movable flange relative to the shaft in the longitudinal direction of the shaft by a spring such that the movable flange retains support of the roll body during stretching of the glass ribbon.

Schematically shows a glass manufacturing apparatus for forming a strip glass from molten glass 1 schematically illustrates a strip-shaped glass stretching apparatus according to one embodiment. FIG. 2 is a cross-sectional view showing an example in which the glass ribbon is stretched by a tension roll in the glass ribbon stretching apparatus shown in FIG. 2. FIG. 2 is a plan view showing a tension roll according to the first embodiment. FIG. 4 is a sectional view taken along the line VI-VI in FIG. 4 Enlarged view of part A in FIG. The top view which shows the tension roll by 2nd Embodiment. Sectional view along the line VII-VII in FIG. 7 Enlarged view of part B in FIG. FIG. 6 is a plan view showing a pull roll according to a third embodiment, in which a coil spring is mounted inside a shaft. The top view showing the tension roll by a 4th embodiment. FIG. 14 is a plan view showing a tension roll according to a fifth embodiment. Sectional view along line XII-XII in FIG. 6 schematically shows a part of the tension roll according to the sixth embodiment that is not thermally expanded at room temperature. 6 schematically shows a part of a tension roll according to a sixth embodiment thermally expanded at a high temperature.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 schematically illustrates a glass manufacturing apparatus for forming a ribbon from molten glass according to one embodiment. Referring to FIG. 1, a glass manufacturing apparatus 100 includes a melter 101, a finer 103, a mixer 104, a feeder 108, and a fusion draw device (FDM) 120. The glass batch material is introduced into the melter 101 as shown by arrow 102. The batch material is melted in melter 101 to produce molten glass 106. The finer 103 has a high-temperature processing area for receiving the molten glass 106 from the melter 101, and air bubbles are removed from the molten glass 106 in the finer 103. The finer 103 communicates with the mixer 104 by a connection pipe 105. That is, the molten glass 106 flows from the fining tank 103 to the mixing tank 104 through the connection pipe 105. The mixer 104 is for agitating the molten glass 106, and is in communication with the feeder 108 by a connecting pipe 107, so that the molten glass flows from the mixer 104 through the connecting pipe 107 to the feeder 108. I have.

  The feeder 108 supplies the molten glass 106 into the FDM 120 through the downcomer 109. The FDM 120 includes an enclosure 122 in which the inlet 110, the shaper 111, and the strip glass stretching apparatus 150 according to one embodiment are located. As shown in FIG. 1, the molten glass 106 flows from the downcomer 109 into the inlet 110, thereby being guided to the forming device 111. The shaper 111 includes an opening 112 for receiving the molten glass 106 flowing into the trough 113. Molten glass 106 flows over trough 113 and flows down two converging sides 114a, 114b as separate streams of molten glass. The separate streams fuse together along the bottom edge or root 116 where the two sides 114a, 114b meet. The converged molten glass 106 is then stretched in the stretching direction 151 by the ribbon stretching apparatus 150 to form a continuous ribbon 148. The belt-shaped glass stretching apparatus 150 includes at least a pair of pulling rolls and an actuator that rotates and drives the pulling rolls.

  FIG. 2 schematically illustrates an exemplary glass ribbon stretcher (150), and FIG. 3 shows the glass ribbon stretched by tension rolls in the glass ribbon stretcher 150. With reference to FIGS. 2 and 3, the ribbon stretching apparatus (150) includes a plurality of pairs of tension rolls for stretching the ribbon, the pairs of tension rolls being along a tension path (ie, It is arranged (along the stretching direction (151)) in which the glass ribbon is stretched. Each pair of pull rolls includes two pull rolls, and the ribbon 148 is stretched between them. Each pulling roll of each pair of pulling rolls has a first major surface of the glass ribbon 148 and a second major surface opposite the first major surface in the thickness direction of the ribbon 148. In contact with each other, the glass ribbon 148 is stretched by rotation of the pulling roll. In some embodiments, the webbing stretcher 150 includes a pair of tension rolls 161 including two opposed full length tension rolls 200 and a plurality of each including two opposed cantilevered stub-type tension rolls 600. And (eg, 162, 163, 164, 165, 166, 167) tension rolls. The full length pull roll 200 extends over the entire width of the ribbon 148, and the stub pull roll 400 extends over only a portion of the full width of the ribbon 148.

  As shown in FIGS. 2 and 3, the full length pull roll 200 is located upstream of the stub pull roll 600 and is temporarily associated with the ribbon 148 over most of the width of the ribbon. Contact, thereby stretching the ribbon 148 at an early stage of the stretching process to form the ribbon 148. The stub-type pull roll 600 is disposed downstream of the full-length pull roll 200 in the drawing direction 151, and contacts the edge of the glass ribbon 148 to draw the glass ribbon 148 in the drawing direction 151. The speed at which the ribbon 148 is stretched is controlled by controlling the angular velocity of each stub-type pull roll 600 so that the final thickness of the ribbon 148 is obtained.

  4 to 9 show an embodiment of the above-described full-length pull roll 200, and FIGS. 10 to 13 show an embodiment of the above-described stub-type pull roll 600. The features of the pull roll disclosed herein can be applied to both full-length pull rolls and stub pull rolls.

  4-6 illustrate an exemplary full length pull roll 200 according to the first embodiment. 4 is a plan view of the pulling roll, FIG. 5 is a cross-sectional view of the pulling roll of FIG. 4 taken along the line VI-VI, and FIG. 6 is an enlarged view of a portion A shown in FIG. It is. As shown in FIGS. 4 and 5, the pull roll 200 according to the first embodiment includes a shaft 210, a roll body 220, a fixed flange 230, a movable flange 240, and a coil spring 250.

  The shaft 210 has a substantially cylindrical shape and extends in the longitudinal direction of the shaft 210 (that is, in the axial direction of the shaft 210). The roll body 220 is a part of the tension roll that comes into contact with the glass ribbon 148. The roll body 220 has a generally cylindrical shape and has a central passage 222 extending through the roll body in the longitudinal direction of the roll body and extending between a first end of the roll body and a second end opposite the roll body. Is defined. The diameter D1 of the central passage 222 is larger than the outer diameter D2 of the shaft 210. That is, there is a predetermined gap G1 between the roll body 220 and the shaft 210.

  The shaft 210 is inserted into the center passage 222 of the roll body 220, and the roll body 220 is attached to the shaft 210 by a fixed flange 230 and a movable flange 240 described later.

The roll body 220 of the pull roll 200 according to the first embodiment may be made of fused silica, which is an amorphous form of silicon dioxide. Since the coefficient of thermal expansion (CTE) of fused silica is approximately 0 (eg, 5.5 × 10 ⁻⁶ m / ° C. at room temperature), fused silica is resistant to thermal shock. Fused silica also exhibits very high heat resistance. Thus, since the roll body 220 is made of fused silica, the pulling roll 200 can significantly reduce the generation and release of particles due to thermal shock.

  Conventional pull roll structures are not suitable for materials having a low coefficient of thermal expansion, such as fused silica. For example, in a conventional pulling roll, a ceramic disk is pressed by a flange and fixed on a shaft. The flange is fixed on the shaft. These move with the shaft if it expands thermally.

  Therefore, when the shaft thermally expands at a high temperature (for example, a temperature to which the shaft is exposed during the operation of the pulling roll), not only the ceramic disk thermally expands but also the flange moves as the shaft expands. The compression force on the ceramic disk is reduced, causing further expansion of the ceramic disk. Therefore, even if the fixed flange moves due to the thermal expansion of the shaft, the ceramic disk does not come off the shaft. However, if the coefficient of thermal expansion of the roll body 220 is very low, as in the embodiments disclosed herein, then the roll body 220 may be thermally expanded when secured to the shaft 210 by conventional fastening methods. The compression force applied to the roll body 220 can be significantly affected, since there is little stretching of the roll body 220 due to the fact that the coefficient of thermal expansion of the shaft is much greater than the coefficient of thermal expansion of the roll body 220.

  According to the embodiment disclosed in the present specification, the roll body 220 as an integral component is separated from the shaft 210, and a movable flange 240 described later moves relatively to the shaft 210 to move the roll body 220. As a result of the pressing, the roll body 220 is fixed at an appropriate position. Therefore, even if the roll body 220 is made of a material (for example, fused silica or the like) having a coefficient of thermal expansion that is significantly smaller than the coefficient of thermal expansion of the shaft 210, the roll body 220 can be fixed at an appropriate position. Hereinafter, this will be described in detail.

  As shown in FIGS. 4 and 5, the roll body 220 of the pull roll 200 according to the first embodiment is inserted and fixed between a fixed flange 230 and a movable flange 240 disposed on a shaft 210. Is done. Further, FIG. 6 shows a step S formed in the roll body 220. However, in order to prevent the thermal stress from concentrating on the depressed area to cause a crack, the roll body 220 has such a step. It is not necessary to form a large step (see the second embodiment in FIGS. 7 to 9).

  As shown in FIG. 6, the movable flange 240 includes a sleeve 242 that extends in the longitudinal direction of the shaft 210, and a cap 244 that extends radially outward from the sleeve 242. The sleeve 242 defines a hole 246 through which the shaft 210 passes and is movable on the shaft 210.

  Because the sleeve 242 is configured to extend in the longitudinal direction of the shaft 210, the sleeve 242 allows the movable flange 240 to move smoothly on the shaft 210 in the longitudinal direction of the shaft 210. In order for the movable flange 240 to move and engage the shaft 210, there must be a small gap between the movable flange 240 and the shaft 210. Due to this gap, the movable flange 240 may tilt relative to the shaft 210 while the movable flange 240 moves on the shaft 210. The greater the angle of inclination, the more easily the movable flange 240 gets caught on the surface of the shaft 210, thereby hindering the movement of the movable flange 240. However, since the movable flange 240 disclosed in this specification includes the sleeve 242 extending in the longitudinal direction of the shaft 210, the maximum inclination angle of the movable flange 240 with respect to the shaft 210 (when the movable flange 240 does not include the sleeve 242). ). Therefore, the movable flange can move on the shaft 210 smoothly. Further, the end of the sleeve 242 may be rounded or chamfered to facilitate smooth movement of the movable flange 240 on the shaft 210.

  A space 214 extending in the longitudinal direction of the shaft 210 is formed in the shaft 210 at one end of the shaft 210. The coil spring 250 and the rod 260 are arranged in the space 214, and one end of the coil spring 250 contacts the inner wall of the shaft 210 and the other end contacts the rod 260 in the space 214. A through hole 264 is formed in one end 262 of the rod 260, a slot 216 is formed in the shaft 210, and a through hole 246 is formed in the movable flange 240. The pin 270 penetrates the slot 216 of the shaft 210 and engages with the through hole 264 of the rod 260 and the through hole 246 of the movable flange 240. Because slot 216 extends in the longitudinal direction of shaft 210, pin 270 is movable in slot 216 in the longitudinal direction of shaft 210.

  With the roll body 220 fixed between the fixed flange 230 and the movable flange 240, the coil spring 250 moves the rod 260 in the direction away from the end 212 of the shaft 210 in the longitudinal direction of the shaft 210. Compressed as if pressing.

  According to the above-described features of the shaft 210, the movable flange 240 is movable relative to the shaft 210 in the longitudinal direction of the shaft 210. At the same time, the movable flange 240 pushes the roll body 220 in the longitudinal direction of the shaft 210 away from the end 212 of the shaft 210 by the elastic restoring force of the coil spring 250. Therefore, the movable flange 240 not only comes into contact with and supports the roll body 220 at room temperature, but also moves even if the shaft 210 thermally expands in the longitudinal direction at a high temperature. Thus, the contact and support of the roll body 220 are maintained.

  Since the roll body 220 is separated from the shaft 210 and is fixed in an appropriate position only by the movable flange 240, the roll body 220 rotates together with the shaft 210. In the embodiment, a convex portion may be formed at an end portion of the roll body 220, and a concave portion that receives the convex portion of the roll body 220 may be formed in the cap 244. Therefore, even when the roll body 220 receives a radial force when the roll body 220 is stretched in contact with the glass ribbon 148 during operation of the pull roll 200, the roll body 220 is prevented from coming off the movable flange 240. .

  If the roll body 220 and the shaft 210 are not concentric, the roll body 220 wobble when the shaft 210 rotates. As a result, a uniform stretching force may not be applied to the band-shaped glass 148 in some cases. To prevent this, the recess in cap 244 may include a ramp 248 that slopes radially inward. The protrusion of the roll body 220 includes a slope 224 that is in contact with the slope 248 and is complementary to the slope 248. The convex and concave portions are designed such that when the inclined surfaces 224 and 248 come into contact with each other, the roll body 220 and the shaft 210 are arranged concentrically. Thus, even though the slopes 224, 248 do not temporarily contact each other (due to the reaction force provided by the glass ribbon 148), the slopes 224, 248 are immediately pressed because the slopes 248 are pushing the slopes 224. Return to contact state. As a result, the cap 244 centers the roll body 220 around the shaft 210, and the outer surface of the roll body 220 is concentric with the rotation axis of the shaft 210.

  Further, when the roll body 220 contacts the glass ribbon 148 and extends the glass ribbon 148, the roll body 220 rotates with the shaft 210 (that is, a slip occurs between the roll body 220 and the movable flange 240). The movable flange 240 should be subjected to a sufficient force by the coil spring 250. This force can be calculated based on the torque applied to the roll body 220 by the ribbon 148 and the coefficient of friction between the movable flange 240 and the roll body 220. The coil spring 250 should maintain its elastic force even at high temperatures, and can be formed of, for example, NIMONIC® 90 material.

  Further, additional complementary grooves 226 and protrusions 249 may be formed in the ramps 224, 248 to ensure that no slippage occurs between the roll body 220 and the movable flange 240. Further, in order to prevent a slip from occurring between the roll body 220 and the moving flange 240, the end of the roll body 220 is non-circular (eg, elliptical) when viewed in the axial direction of the roll body 220. Can be

  The fixed flange 230 can be designed identically in shape to the movable flange 240 except that the fixed flange 230 is fixed on the shaft 210. The fixing flange 230 may be formed integrally with the shaft 210, or the fixing flange 230, which may be a separate member, may be fixed to the shaft 210. The securing method may include various known securing methods such as screw engagement, pin engagement, and the like. Further, the end of the roll body 220 that engages with the fixed flange 230 is designed to be the same as the end of the roll body 220 that engages with the movable flange 240. That is, a roll body 220 having an end complementary to the flanges 230, 240 that are identical in shape is disposed between the two flanges 230, 240, thereby centering the roll body 220 and providing a roll. The end of the body 220 is prevented from coming off the flange or slipping on the flange 230,240.

  The roll body 220 has an inner diameter D1 larger than the outer diameter D2 of the shaft 210 and the outer diameter D3 of the sleeve 242. That is, there is a predetermined gap G1 between the roll body 220 and the shaft 210, and there is a predetermined gap G2 between the roll body 220 and the sleeve 242. The predetermined gaps G1 and G2 are set so that the shaft 210 or the sleeve 242 does not contact the roll body 220 even when the shaft 210 or the sleeve 242 has a maximum radial thermal expansion.

  7 to 9 show a pull roll 300 according to a second embodiment. FIG. 7 is a plan view of a pull roll 300 according to the second embodiment, FIG. 8 is a cross-sectional view along line VII-VII of FIG. 7, and FIG. 9 is an enlarged view of a portion B of FIG. It is.

  As shown in FIGS. 7 to 9, in the pull roll 300 according to the second embodiment, the roll body 320 is inserted and fixed between the fixed flange 330 and the movable flange 340 arranged on the shaft 310. The coil spring 350 is arranged outside the shaft 310. The movable flange 340 in the second embodiment has a similar design and function as the movable flange 240 in the first embodiment. That is, the movable flange 340 may include a sleeve 342 and a cap 344 (similar to the movable flange 240 in the first embodiment) to move on the shaft 310 to support the roll body 320.

  Shaft 310 includes a first spring seat 360 and a second spring seat 370 for mounting coil spring 350. The first spring seat 360 is disposed at one end 312 of the shaft 310, and the second spring seat 370 is spaced apart from the first spring seat 360 in the longitudinal direction of the shaft 310. The first spring seat 360 may be formed integrally with the shaft 310 or may be a separate member. The first spring seat 360 may be, for example, a screw engagement, a pin engagement, welding, or the like. Can be fixed to the shaft 310 by a known fixing method. Second spring seat 370 includes a hole 372, which is movably mounted to shaft 310 such that shaft 310 passes through hole 372.

  The coil spring 350 is disposed between the first spring seat 360 and the second spring seat 370. While the roll body 320 is fixed between the fixed flange 330 and the movable flange 340, the coil spring 350 is compressed, so that the coil spring 350 moves the second spring seat 370 in the longitudinal direction of the shaft 310. Push away from end 312 of shaft 310. Therefore, the movable flange 340 that is in contact with the second spring seat 370 is also pushed away from the end 312 of the shaft 310. The second spring seat 370 is provided as needed for more stable installation of the coil spring 350. In another embodiment, the pull roll may not include the second spring seat 370, in which case the coil spring 350 may be in direct contact with the movable flange 340.

  The movable flange 340 is relatively movable with respect to the shaft 310 in the longitudinal direction of the shaft 310, but the roll body 320 is moved by the elastic restoring force of the coil spring 350 in the longitudinal direction of the shaft 310. Pushed away from 312. Therefore, the movable flange 340 not only contacts and supports the roll body 320 at room temperature, but also moves the flange 310 at a high temperature even if the shaft 310 has caused the maximum thermal expansion in the longitudinal direction. To maintain contact and support with the roll body 320.

  The roll body 320 has an inner diameter D5 that is larger than the outer diameter D4 of the shaft 310. That is, a predetermined gap G3 exists between the roll body 320 and the shaft 310. The predetermined gap G3 is set such that the shaft (310) does not come into contact with the roll body 320 even when the shaft 310 has undergone the maximum thermal expansion radially outward.

  FIGS. 10 and 11 show a pull roll 400 according to the third embodiment and a pull roll 500 according to the fourth embodiment, respectively. The pulling roll 400 according to the third embodiment and the pulling roll 500 according to the fourth embodiment are cantilever-type stub-type pulling rolls, and extend over only a part of the entire width of the glass ribbon 148, and the first roll described above. It has similar features to the pull roll 200 according to the embodiment and the pull roll 300 according to the second embodiment. More specifically, the pull roll 400 according to the third embodiment shown in FIG. 10 includes a shaft 410, a roll body 420, a fixed flange 430, a movable flange 440, and a coil spring 450. The coil spring 450 is disposed inside the shaft 410. The pull roll 500 according to the fourth embodiment shown in FIG. 11 includes a shaft 510, a roll body 520, a fixed flange 530, a movable flange 540, and a coil spring 550. The coil spring 550 is disposed outside the shaft 510. The coil spring 550 is disposed between the first spring seat 560 and the second spring seat 570.

  In one embodiment of the web stretching apparatus, regardless of whether the coil springs 250, 350, 450, 550 are located inside or outside the shafts 210, 310, 410, 510, the coil springs 250, Portions of the shafts 210, 310, 410, 510 including 350, 450, 550 are disposed outside the FDM 120, and only the remaining portion of the tension rolls 200, 300, 400, 500 except for the portion disposed outside the FDM 120 is used. , FDM 120. That is, the aforementioned portions of the shafts 210, 310, 410, 510 are not exposed to high temperatures. Therefore, the performance of the coil springs 250, 350, 450, 550 is not significantly affected by temperature.

  In the tension roll 200 according to the first embodiment and the tension roll 400 according to the third embodiment in which the coil springs 250 and 450 are disposed inside the shafts 210 and 410, the operator does not expose the coil springs 250 and 450 to the outside. There is no danger of the hands being caught on the coil springs 250, 450, thereby greatly improving the safety of the operator. On the other hand, the pull roll 300 according to the second embodiment and the pull roll 500 according to the fourth embodiment include the coil springs 350 and 550 disposed outside the shafts 310 and 510, so that a simple structure and easy manufacturing are possible. Is advantageous.

  The pull roll 200 according to the first embodiment and the pull roll 300 according to the second embodiment are full-length pull rolls disposed upstream of the stub pull rolls 400 and 500. Since the temperature of the ribbon 148 decreases as the ribbon 148 is stretched in the stretching direction 151, the full length pull rolls 200, 300 located upstream of the stub-type pull rolls 400, 500 are exposed to significantly higher temperatures. On the other hand, the stub type tension rolls 400, 500 are exposed to relatively low temperatures. Thus, if the coil spring located outside the shaft of the stub type pull roll is located inside the FDM 120, the coil spring will not be exposed to the operator, and at the same time, the performance of the coil spring will be less than the overall upstream length. It is not significantly affected by temperature as compared to die pull rolls. Figures 12 and 13 show such a pull roll.

  FIG. 12 is a plan view showing a tension roll according to the fifth embodiment, and FIG. 13 is a cross-sectional view taken along line XII-XII in FIG.

  The stub type tension roll 600 of the fifth embodiment includes a shaft 610, a roll body 620, a fixed flange 630, a movable flange 640, a coil spring 650, and a spring seat 660. The coil spring 650 is disposed between the spring seat 660 outside the shaft 610 and the movable flange 640. Spring seat 660 is located on a portion of shaft 610 located inside FDM 120. As described above, since the coil spring 650 is disposed between the spring seat 660 and the movable flange 640, the coil spring 650 is also disposed inside the FDM 120. With the roll body 620 fixed between the fixed flange 630 and the movable flange 640, the coil spring 650 is compressed, and the coil spring 650 moves the movable flange 640 from the end 612 of the shaft 610 in the longitudinal direction of the shaft 610. Push in the direction away.

  Since the spring seat 660 of the fifth embodiment is located closer to the roll body 620 (as compared to the first spring seat 410 of the fourth embodiment), the coil spring 650 and the movable flange 640 are arranged. However, the technical idea of the present invention is not limited to this embodiment, and for example, while applying a sufficient force to the roll body 620, the length of the coil spring 650 may be reduced. By adjusting the height, it is also possible to provide a spring seat between the coil spring 650 and the movable flange 640.

  In the glass ribbon device 150 according to the embodiment shown in FIG. 2, since the tension roll 200 according to the first embodiment and the tension roll 600 according to the fifth embodiment are advantageous from the viewpoint of safety, they are not used. It can be adopted for a full length pull roll and a stub pull roll, respectively. However, the strip-shaped glass stretching apparatus according to another embodiment employs the tension roll 300 according to the second embodiment as a full-length tension roll, and the tension roll 400 according to the third embodiment or the tension roll 500 according to the fourth embodiment. Can be employed as a stub type tension roll.

  In the pull roll 200 according to the first embodiment, the movable flange 240 moves on the shaft 210 relative to the shaft 210. If glass condensate falls and accumulates in the area of the shaft 210 where the movable flange 240 moves, unnecessary stress may be exerted on the roll body 220. That is, in a state where the shaft 210 is thermally expanded at a high temperature, the glass condensate may fall and accumulate on a part of the shaft 210 that has moved relatively to the movable flange 240. In this case, when the shaft 210 contracts to its original length when the tension roll 200 returns to room temperature, the glass condensate deposited on the shaft 210 moves toward the movable flange 240 and is captured by the movable flange 240. . Therefore, the contraction force of the shaft 210 is transmitted to the roll body 220 via the movable flange 240, and the roll body 220 may be damaged or broken.

  14a and 14b show a part of a pull roll according to a sixth embodiment. FIG. 14a shows a portion of a non-thermally expanded tension roll at room temperature. Referring to FIG. 14a, the sleeve 242 of the movable flange 240 extends to at least a portion of the area C of the shaft 210 where glass condensate is likely to fall. The sleeve 242 of the movable flange 240 includes an inner surface 252 facing the outer peripheral surface of the shaft 210, and a recess 258 is formed at an end 254 of the inner surface 252 which is the end farthest from the roll body 220.

  FIG. 14b shows a portion of a thermally expanded tension roll at elevated temperatures. Referring to FIG. 14b, when the shaft 210 thermally expands in the longitudinal direction of the shaft 210, the shaft 210 moves in a direction indicated by an arrow T relative to the movable flange 240. However, since the sleeve 242 of the movable flange 240 extends to the area C of the shaft 210 where the glass condensate is likely to fall, the glass condensate falls onto the sleeve 242 and the glass G deposited on the sleeve 242 Is formed. This prevents the deposited glass from being formed on the shaft 210. Further, the glass condensate falls and deposits on shaft 210 (beyond area C), but as the shaft contracts, the deposited glass simply enters recess 258 and becomes trapped in movable flange 240. Not done. Therefore, no stress is applied to the movable flange 240 and the roll body 220.

  Note that the technical concept of the present disclosure is not limited to the above-described embodiment and the examples illustrated in the accompanying drawings. It will be apparent to those skilled in the art that various substitutions, modifications, and changes are possible within the scope of the present disclosure.

  Hereinafter, preferred embodiments of the present invention will be described separately.

Embodiment 1
A tension roll for stretching the glass ribbon,
A roll body having a central passage extending through the roll body in the longitudinal direction;
A shaft extending through the central passageway and spaced from the roll body;
A first flange movably disposed on the shaft and movable in a longitudinal direction of the shaft;
A spring configured to push the first flange in the longitudinal direction of the shaft.

Embodiment 2
2. The pull roll of embodiment 1, wherein the pull roll is a full length pull roll.

Embodiment 3
The pull roll of embodiment 1, wherein the pull roll is a stub-type pull roll.

Embodiment 4
4. The pull roll according to any one of embodiments 1-3, wherein the roll body comprises a fused silica material.

Embodiment 5
The first flange is
A sleeve slidably engaging the shaft;
5. The pull roll of embodiment 4, comprising a cap extending outwardly from the sleeve, the cap being in contact with the roll body such that the first flange supports the roll body.

Embodiment 6
The pull roll according to embodiment 5, wherein the roll body and the cap include a convex portion and a concave portion that receives the convex portion.

Embodiment 7
The tension roll of embodiment 6, wherein the protrusion and the recess include complementary inclined surfaces that contact each other.

Embodiment 8
Embodiment 8. The pull roll of embodiment 7, wherein the sloping surface includes mutually complementary grooves and protrusions.

Embodiment 9
The tension roll of embodiment 5, wherein the cap is configured to center the roll body about the shaft.

Embodiment 10
6. The pull roll of embodiment 5, wherein the sleeve includes an inner surface facing the shaft and a recess located at one end of the inner surface.

Embodiment 11
2. The tension roll of embodiment 1, wherein the spring is a coil spring disposed inside the shaft.

Embodiment 12
2. The tension roll of embodiment 1, wherein the spring is a coil spring disposed outside the shaft.

Embodiment 13
The tension roll is
A rod disposed inside the shaft to engage the spring;
A pin coupling the first flange to the rod.
The shaft includes at least one slot extending in the longitudinal direction of the shaft, and wherein the pin is movable in the slot in the longitudinal direction of the shaft;
The pull roll according to embodiment 11.

Embodiment 14
The pull roll further includes a second flange fixed on the shaft;
The roll body is disposed between the first flange and the second flange,
The pulling roll according to any one of the first to third embodiments.

Embodiment 15
13. The pull roll of embodiment 12, wherein the spring is extendable surrounding at least a portion of the shaft.

Embodiment 16
An apparatus for stretching a glass ribbon,
At least one pair of first pulling rolls;
At least one pair of second tension rolls disposed downstream of the pair of first tension rolls along a tension path,
The apparatus according to claim 1, wherein the at least one pair of first pulling rolls is a full-length pulling roll, and the at least one pair of second pulling rolls is a stub-type pulling roll.

Embodiment 17
A method of stretching a glass ribbon,
Including a step of stretching the glass ribbon using at least a pair of tension rolls,
The pulling roll includes a shaft, a roll body rotatable with the shaft, a movable flange disposed on the shaft and supporting the roll body, and a movable flange disposed on the shaft and extending in the longitudinal direction of the shaft. And a spring that applies force to
Wherein the roll body comprises a fused silica material and is spaced from the shaft;
The step of stretching further comprises: moving the movable flange in the longitudinal direction of the shaft by the spring so that the movable flange maintains support of the roll body during stretching of the glass ribbon. how to.

Embodiment 18
The movable flange,
A sleeve slidably engaging the shaft;
18. The method of embodiment 17, comprising a cap extending outwardly from the sleeve, wherein the movable flange contacts the roll body to support the shaft.

Embodiment 19
19. The method of embodiment 18, wherein the roll body and the cap include a protrusion and a recess for receiving the protrusion.

Embodiment 20
Embodiment 20. The method of embodiment 18 or 19, wherein the sleeve includes an inner surface facing the shaft and a recess located at one end of the inner surface.

100 Glass production equipment 120 Fusion draw equipment (FDM)
148 Strip glass 150 Strip glass stretching device 151 Stretching direction 200, 300 Full length pull roll 210, 310, 410, 510, 610 Shaft 216 Slot 220, 320, 420, 520, 620 Roll body 222 Central passage 224, 248 Inclined surface 226 Groove 230, 330, 430, 530, 630 Fixed flange 240, 340, 440, 540, 640 Movable flange 242, 342 Sleeve 244, 344 Cap 249 Projection 250, 350, 450, 550, 650 Coil spring 252 Inner surface 258 Depression 260 Rod 270 pins 400, 500, 600 Stub type pull roll

Claims (10)

A tension roll for stretching the glass ribbon,
A roll body having a central passage extending through the roll body in the longitudinal direction;
A shaft extending through the central passageway and spaced from the roll body;
A first flange movably disposed on the shaft and movable in a longitudinal direction of the shaft;
A spring configured to push the first flange in the longitudinal direction of the shaft.   The pull roll of claim 1, wherein the roll body comprises a fused silica material. The first flange is
A sleeve slidably engaging the shaft;
3. The pulling roll of claim 2, further comprising a cap extending outwardly from the sleeve, wherein the first flange contacts the roll body to support the roll body.   The pulling roll according to claim 3, wherein the roll body and the cap include a convex portion and a concave portion that receives the convex portion.   The pulling roll according to claim 4, wherein the convex portion and the concave portion include complementary inclined surfaces that contact each other.   6. The pull roll of claim 5, wherein the inclined surface includes grooves and protrusions complementary to each other. The spring is a coil spring disposed inside the shaft,
The tension roll is
A rod disposed inside the shaft to engage the spring;
A pin coupling the first flange to the rod.
The shaft includes at least one slot extending in the longitudinal direction of the shaft, and wherein the pin is movable in the slot in the longitudinal direction of the shaft;
The pulling roll according to claim 1. A method of stretching a glass ribbon,
Including a step of stretching the glass ribbon using at least a pair of tension rolls,
The pulling roll includes a shaft, a roll body rotatable with the shaft, a movable flange disposed on the shaft and supporting the roll body, and a movable flange disposed on the shaft and extending in the longitudinal direction of the shaft. And a spring that applies force to
The roll body includes a fused silica material and is spaced from the shaft;
The step of stretching further comprises: moving the movable flange in the longitudinal direction of the shaft by the spring so that the movable flange maintains support of the roll body during stretching of the glass ribbon. how to. The movable flange,
A sleeve slidably engaging the shaft;
The method of claim 8, further comprising a cap extending outwardly from the sleeve, wherein the movable flange contacts the roll body to support the shaft.   The method of claim 9, wherein the roll body and the cap include a protrusion and a recess for receiving the protrusion.

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