Down-draw roller for forming glass substrate and glass substrate forming apparatus

Abstract

The present disclosure provides a glass substrate forming down-draw single roller, which comprises an inner ring shaft sleeve (31) and outer ring roller segments (33) distributed in a circumferential direction, each of the outer ring roller segments (33) is connected with an outer circumferential surface of the inner ring shaft sleeve (31) through a corresponding radial telescopic rod mechanism (32), and each of the outer ring roller segments (33) is capable of moving back and forth along a radial direction relative to the inner ring shaft sleeve (31) through driving of the corresponding radial telescopic rod mechanism (32). In addition, the present disclosure also provides a glass substrate forming down-draw roller and a forming device. The present disclosure effectively improves the uniformity of the pressing force applied by the down-draw roller to the surface of the glass substrate, thereby inhibiting the possibility of generating scratches and improving the substrate yield.

Description

Technical Field

[0001] This disclosure relates to the field of glass substrate forming technology, and more particularly to a drop roller for forming glass substrates. Furthermore, this disclosure also relates to a glass substrate forming apparatus. Background Technology

[0002] As one of the key materials used in TFT-LCD or OLED display panels, glass substrates are currently produced using two main technologies: overflow pull-down process and float process. Since the glass substrates produced by the overflow process do not come into contact with any other medium on both sides, they do not require subsequent grinding or polishing treatments on the substrate surface, as is the case with glass substrates produced by the float process, thus reducing production costs.

[0003] The main shape characteristics of glass substrates produced using the overflow pull-down method are as follows: In the width direction of the glass substrate, the thickness of the central region is approximately fixed, while the thickness of the edge regions located outside the central region is greater. The central region is the product area that can be used for related products. To achieve stable downward transport of the glass substrate during the forming process, pull-down rollers are currently used to clamp the transition area between the central and edge regions of the glass substrate, thereby conveying it downwards under the clamping of the pull-down rollers.

[0004] However, the thickness of the glass substrate's edge region is greater than that of the central region, causing the thickness of the glass substrate to gradually increase from the central region to the edge region along its width. Furthermore, the thickness of the edge region varies at different locations along the width. Therefore, during the downward transport of the glass substrate by the pull rollers clamping the edge region, the reduced contact area between the pull rollers and the glass substrate results in uneven pressure on the contact area. Applying excessive pressure to the glass substrate may cause scratches on its surface, which can then lead to cracks originating from these scratches and propagating to the point of breakage during subsequent cutting processes. This technical challenge has plagued the glass manufacturing industry for many years and remains unresolved.

[0005] In view of this, it is necessary to design a more reasonable and effective pull-down roller to alleviate or overcome the above-mentioned technical difficulties. Summary of the Invention

[0006] One technical problem to be solved by this disclosure is to provide a pull-down single roller for glass substrate forming, which can be applied to pull-down rollers for glass forming to reduce or overcome the problem of uneven clamping and pressing force during the glass substrate clamping and conveying process, thereby improving the yield of glass substrates.

[0007] Furthermore, another technical problem to be solved by this disclosure is to provide a pull-down roller for forming glass substrates, which can be applied to a glass substrate forming apparatus to reduce or overcome the problem of uneven clamping and pressing force during the glass substrate clamping and conveying process, thereby improving the yield of glass substrates.

[0008] Furthermore, another technical problem to be solved by this disclosure is to provide a glass substrate forming apparatus that can reduce or overcome the problem of uneven clamping and pressing force during the glass substrate clamping and conveying process, thereby improving the yield of glass substrates.

[0009] To solve the above-mentioned technical problems, this disclosure provides a pull-down single roller for forming a glass substrate, which includes an inner ring bushing and outer ring roller segments spaced apart along the circumferential direction. Each of the outer ring roller segments is connected to the outer circumferential surface of the inner ring bushing through a corresponding radial telescopic rod mechanism, so that each can move back and forth radially relative to the inner ring bushing through the drive of the corresponding radial telescopic rod mechanism.

[0010] In some embodiments, the outer roller segments are evenly spaced along the axial direction.

[0011] In some embodiments, the radial telescopic rod mechanism is a hydraulic telescopic rod mechanism.

[0012] In some embodiments, the hydraulic telescopic rod mechanism includes a pressure detection device for detecting working pressure.

[0013] Based on the above-mentioned technical solution of the pull-down single roller for glass substrate forming, the embodiments of this disclosure further provide a pull-down roller for glass substrate forming, which includes a connecting shaft and a plurality of pull-down single rollers. The pull-down single rollers are pull-down single rollers for glass substrate forming according to any of the above technical solutions. The plurality of pull-down single rollers are fixed sequentially at intervals on the outer periphery of the connecting shaft starting from the working end of the connecting shaft along the axial direction of the connecting shaft. The diameter of the pull-down single rollers decreases sequentially from the first pull-down single roller closest to the working end to the last pull-down single roller furthest from the working end.

[0014] In some embodiments, the inner ring bushing of each of the pull-down rollers is threaded or keyed to the connecting shaft.

[0015] In some embodiments, the number of the plurality of pull-down rollers is ≥3.

[0016] Based on the above-mentioned technical solution of the pull roller for forming glass substrate, this disclosure further provides a glass substrate forming apparatus, which includes a forming chamber and an annealing chamber arranged sequentially below a glass melt overflow tank. The forming chamber and the annealing chamber have a substrate conveying channel for passing through sheet glass substrates during production. In the annealing chamber, a plurality of pull roller groups spaced apart in the vertical direction are arranged sequentially along the substrate conveying channel. Each pull roller group includes a pair of pull rollers arranged on both sides of the substrate conveying channel in the width direction for clamping the edge portion of the sheet glass substrate. Each of the pull roller pairs on both sides includes pull rollers arranged at relative intervals in the thickness direction of the substrate conveying channel. The pull rollers are pull rollers for forming glass substrates according to any of the above technical solutions.

[0017] In some embodiments, the connecting shafts of each of the pull-down rollers are arranged to be adjustable in position along the thickness direction of the substrate conveying channel.

[0018] In some embodiments, the glass substrate forming apparatus is divided from top to bottom into: an overflow chamber including the glass melt overflow tank, a forming chamber, and an annealing chamber, wherein a partition plate is provided between the overflow chamber and the forming chamber, and a plurality of heat insulation plates are spaced apart in the vertical direction in the annealing chamber.

[0019] Through the above technical solution, the pull-down single roller for glass substrate forming provided in this disclosure can adjust the radial position of the outer roller segment via a radial telescopic rod mechanism, thereby adjusting the diameter of the pull-down single roller. When multiple pull-down single rollers with adjustable diameters are connected in series to form a pull-down roller system, the diameter of each pull-down single roller can be adjusted according to the contact position between each pull-down single roller and the edge area of ​​the glass substrate, ensuring that the pull-down single roller and the glass substrate are in just-right contact. This original design effectively improves the uniformity of the pressing force applied to the glass substrate surface by the entire pull-down roller, thereby suppressing the possibility of scratches. Simultaneously, the radial telescopic rod mechanism inside each pull-down single roller can adjust the pressing force applied to the glass substrate surface. While ensuring the pull-down roller can properly transport the glass substrate, the magnitude of the pressing force is minimized, further reducing the possibility of scratches caused by the pressing force applied to the glass substrate surface, thus effectively improving the yield of the glass substrate. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the pull-down single roller for forming glass substrates disclosed in this embodiment; Figure 2 This is a cross-sectional view of the pull-down roller for forming a glass substrate disclosed in this embodiment. Figure 3 This is a schematic diagram of the structure of the glass substrate forming apparatus disclosed in the embodiments of this disclosure.

[0022] Explanation of reference numerals in the attached figures: 11. Glass molten overflow tank; 12. Overflow wall; 13. Molten glass; 14. Molten glass mixture; 15. Separator plate; 16. Cooling roller; 17. Overflow tank body; 18. Heat insulation plate; I. Overflow chamber; II. Forming chamber; III. Annealing chamber; 21. Sheet glass substrate; 22. First pull-down roller; 23. Second pull-down roller; 24. Third pull-down roller; 25. Last pull-down roller; 26. Connecting shaft; A. Central area of ​​substrate; B. Transition area of ​​substrate; C. Edge area of ​​substrate; D. Substrate conveying channel; R. Pull-down roller; 31. Inner ring bushing; 32. Radial telescopic rod mechanism; 33. Outer ring roller segment. Detailed Implementation

[0023] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0024] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0025] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0027] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0028] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0030] Example See Figure 1As shown, a glass substrate forming pull-down single roller of one embodiment of the present disclosure includes an inner ring bushing 31 and outer ring roller segments 33 spaced apart in the circumferential direction. Each outer ring roller segment 33 is connected to the outer circumferential surface of the inner ring bushing 31 by a corresponding radial telescopic rod mechanism 32, so that each can move back and forth radially relative to the inner ring bushing 31 by the drive of the corresponding radial telescopic rod mechanism 32.

[0031] The glass substrate forming pull-down roller provided in the above embodiments of this disclosure can adjust the radial position of the outer roller segment 33 through the radial telescopic rod mechanism 32, thereby adjusting the diameter of the pull-down roller. When multiple pull-down rollers with different diameters are connected in series to form a pull-down roller R, the diameter of each pull-down roller can be reasonably adjusted according to the contact position between each pull-down roller and the edge area of ​​the glass substrate by adjusting the position of the outer roller segment 33 of each pull-down roller. This ensures that the pull-down roller and the glass substrate are in just-contact. This ingenious design can effectively improve the uniformity of the pressing force applied by the pull-down roller to the surface of the glass substrate, thereby suppressing the possibility of scratches. Meanwhile, the radial telescopic rod mechanism 32 inside each pull-down roller can adjust the pressing force applied to the surface of the glass substrate. Under the premise of ensuring that the pull-down roller can transmit the sheet glass substrate 21 normally, the magnitude of the pressing force is reduced as much as possible. This can further reduce the possibility of scratches caused by the pressing force applied to the surface of the glass substrate, thereby effectively improving the yield of the glass substrate.

[0032] See also Figure 1 In some embodiments, the outer roller segments 33 are evenly spaced along the axial direction. Figure 1 The embodiment shows an outer roller segment 33 divided into four equal parts, that is, divided according to a 90-degree central angle. It can also be divided into three or five equal parts as needed. This uniform division makes it easier to standardize parts, facilitates unified processing, and reduces product costs.

[0033] In some embodiments, the radial telescopic rod mechanism 32 can be a hydraulic telescopic rod mechanism. It should be noted that the radial telescopic rod mechanism can employ various telescopic rod mechanisms familiar to those skilled in the art, such as electric telescopic rod mechanisms, electro-hydraulic hybrid telescopic rod mechanisms, pneumatic telescopic rod mechanisms, etc. This embodiment uses a hydraulic telescopic rod mechanism, which has the advantages of good stability and reliable working performance.

[0034] In some embodiments, a pressure detection device can be provided to detect the pressing force of each pull-down roller on the edge region of the sheet glass substrate 21 in a timely manner. For example, in the case of a hydraulic telescopic rod mechanism, a pressure detection device for detecting working pressure can be provided more conveniently and effectively. In this case, a pressure sensor can be installed in the rodless chamber of the hydraulic cylinder of the hydraulic telescopic mechanism or in its working oil circuit. By detecting the working oil pressure, the pressing force on the edge region of the sheet glass substrate 21 can be effectively obtained. Generally, the product of the working oil pressure and the pressure area of ​​the hydraulic cylinder piston can be divided by the contact area between the outer ring roller segment 33 of the pull-down roller and the edge region of the sheet glass substrate 21 to easily calculate the pressing force. In the actual detection and control process, a data table corresponding to the working oil pressure and the pressing force can be formed based on production practice data.

[0035] Based on the various embodiments of the pull-down single roller disclosed above, further, in some embodiments, see [reference needed]. Figure 2 The present invention provides a pull-down roller for forming a glass substrate, which includes a connecting shaft 26 and a plurality of pull-down single rollers. The pull-down single rollers can be the pull-down single rollers for forming a glass substrate in the above embodiments. The plurality of pull-down single rollers are fixedly fixed at intervals along the axial direction of the connecting shaft 26, starting from the working end of the connecting shaft 26 (i.e. the free end that is not connected to the rotary drive mechanism). The diameter of the pull-down single rollers decreases sequentially from the first pull-down single roller 22 closest to the working end to the last pull-down single roller 25 furthest from the working end.

[0036] In some embodiments, the connection between the inner ring bushing 31 of each pull-down roller and the connecting shaft 26 can be a threaded connection or a keyed connection.

[0037] In some embodiments, the number of pull-down rollers included in each pull-down roller is ≥3. Of course, within the scope of the technical concept of this disclosure, it is also possible to use two pull-down rollers.

[0038] Based on the aforementioned technical solution for the pull-down roller, further, see... Figure 3 In some embodiments, this disclosure provides a glass substrate forming apparatus, which includes a forming chamber II and an annealing chamber III arranged sequentially below a glass melt overflow tank 11. The forming chamber II and the annealing chamber III have a substrate transport channel D for the sheet glass substrate 21 to pass through during production. In the annealing chamber III, a plurality of pull roller groups spaced apart in the vertical direction are arranged sequentially along the substrate transport channel D. Each pull roller group includes a pair of pull rollers arranged on both sides in the width direction of the substrate transport channel D for clamping the edge portion of the sheet glass substrate. Each pair of pull rollers on both sides includes pull rollers arranged at relative intervals in the thickness direction of the substrate transport channel D. The pull rollers are pull rollers R for forming glass substrates as described in any of the above embodiments.

[0039] It should be noted here that, see Figure 3 The substrate conveying channel D in forming chamber II and annealing chamber III is actually a continuous channel passing through the gaps between the upper and lower roller pairs. It corresponds to the shape of the sheet glass substrate 21, and correspondingly, its width direction corresponds to the direction of the sheet glass substrate 21. Figure 3 The center direction is perpendicular to the paper surface; the vertical direction is the height direction; and the thickness direction corresponds to the thickness direction of the sheet glass substrate 21. Figure 3 The left and right directions in the middle.

[0040] Based on the above-described technical solution of the glass substrate forming apparatus, in some embodiments, the connecting shafts 26 of each pull roller can be arranged to be adjustable in position along the thickness direction of the substrate conveying channel D. Inspired by the technical concept of this disclosure, although not shown in the figures, this can be implemented in various mechanical structures by those skilled in the art. For example, the rotation drive device and the rotation support of the connecting shaft 26 can be mounted on a sliding seat that can be adjusted along the guide rail. The sliding drive method can be hydraulic telescopic drive, screw drive, etc. This adjustable structure of the connecting shaft 26 allows the pull rollers to more easily adapt to thickness variations in the edge region of the sheet glass substrate 21, which will be described in more detail below in the description of the adjustment process.

[0041] See Figure 3 In some embodiments, the glass substrate forming apparatus can be divided from top to bottom into: an overflow chamber I, a forming chamber II, and an annealing chamber III, including a glass melt overflow tank 11, wherein a partition plate 15 is provided between the overflow chamber I and the forming chamber II, and a plurality of heat insulation plates 18 are provided at intervals along the vertical direction in the annealing chamber III.

[0042] The various embodiments of this disclosure have been described above, and the following comparisons are made. Figures 1 to 3 One embodiment of this disclosure is described in a relatively comprehensive manner, and the working adjustment process is described in more detail.

[0043] Specifically, see Figures 1 to 3This disclosure discloses a pull-down roller R for forming a glass substrate, which is generally used in pairs. The pair of pull-down rollers R clamps the edge of a sheet glass substrate 21 in an annealing chamber III. The pull-down roller R may include multiple pull-down single rollers of this disclosure connected in series, each pull-down single roller being fixedly connected to a connecting shaft 26. Each pull-down single roller may include an outer ring roller segment 33, an inner ring bushing 31, and a radial telescopic rod mechanism 32 (a hydraulic telescopic rod mechanism is used in the figure) connecting the outer ring roller segment 33 and the inner ring bushing 31. That is, the outer ring roller is divided into multiple outer ring roller segments 33, and each segment is separate and not connected to each other. The connecting shaft 26 that fixes the pull-down roller can be adjusted along the thickness direction of the sheet glass substrate 21, that is, along the thickness direction of the substrate conveying channel D. Generally, the temperature in the annealing chamber is a temperature that makes the viscosity of the glass substrate ≥10¹³ poise or lower.

[0044] The number of pull-down rollers is generally ≥3 (rounded to the nearest integer). The inner ring bushing 31 of each pull-down roller can be connected and fixed to the connecting shaft 26 using a threaded connection or a key connection. The number of outer ring roller segments 33 is generally ≥3, although two are also acceptable. The radial hydraulic telescopic rod mechanism allows for telescopic adjustment. Since the radial hydraulic telescopic rod mechanism is driven by a hydraulic cylinder, the hydraulic pressure can be precisely controlled as required.

[0045] First, such as Figure 3 As shown, the glass substrate forming apparatus disclosed herein has the following specific process flow for forming the sheet glass substrate 21: Molten glass liquid 13, after clarification and homogenization and with a suitable viscosity, is introduced into the glass melt overflow tank 11. When the liquid level of the molten glass liquid 13 is higher than the platform of the glass melt overflow tank 11, the molten glass liquid 13 will flow down along the overflow wall 12, eventually merging at the lower end to form a molten glass liquid confluence 14. Considering the high temperature of the molten glass liquid in overflow chamber I, in order to prevent the heat in overflow chamber I from flowing into forming chamber II and affecting the forming process of the sheet glass substrate 21 in forming chamber II, the molten glass liquid confluence 14 is formed... A partition plate 15 is provided near the lower end of 14 to block the thermal movement from overflow chamber I to forming chamber II. To achieve rapid forming of the molten glass liquid 14, cooling rollers 16 are provided in forming chamber II, positioned directly below the partition plate 15. The cooling rollers 16 are also located on both sides of the sheet glass substrate 21 in the thickness direction and on both sides of the sheet glass substrate 21 in the width direction. The cooling rollers 16 are arranged in pairs, meaning that the sheet glass substrate 21 is held between two pairs of cooling rollers on both sides in the width direction. To achieve rapid cooling of the sheet glass substrate 21, the viscosity of the side of the sheet glass substrate 21 in contact with the cooling rollers 16 is controlled at 10. 9.0Above a certain point, the cooling roller 16 can exchange heat through the cold air circulating inside it to reduce the temperature of the side of the sheet glass substrate 21 that is in direct contact with the cooling roller 16; after the sheet glass substrate 21 is processed in the forming chamber II, it continues to be conveyed to the annealing chamber III, wherein the viscosity of the glass substrate in the annealing chamber III is ≥10. 13 Poisson (i.e., the temperature of the sheet glass substrate 21 in annealing chamber III does not exceed a viscosity of 10) 13 (Regarding the temperature of the glass substrate 21), considering that if the cooling rate is not properly controlled during the cooling process, uneven stress may easily occur on the surface of the glass substrate 21, therefore, multiple pairs of heat insulation plates are used in annealing chamber III. Figure 1 Only three pairs of heat insulation plates 18 are shown in the text, but in reality, there may be more than three pairs. In addition, to achieve stable downward transport of the sheet glass substrate 21, multiple pairs of downward rollers R are also installed in the annealing chamber III. Figure 1 Only two pairs of pull rollers R are given in the text, but in reality there may be more than two pairs); when the sheet glass substrate 21 is cooled to a certain temperature, it can be cut into sheets, and finally the required glass substrate can be obtained.

[0046] Considering that the mainstream thickness of glass substrates used in liquid crystal displays is generally ≤0.7mm, during the forming process of the sheet glass substrate 21, the cooling roller 16 in the forming chamber II simultaneously conveys the molten glass liquid 14 downwards and pulls it in the width direction of the sheet glass substrate 21. This causes the thickness of the central region of the sheet glass substrate 21 to become thinner. At the same time, this also causes the thickness of the two sides of the sheet glass substrate 21 to gradually increase and then gradually decrease, that is, as... Figure 2 The sheet glass substrate 21 exhibits a central region A with uniform thickness, a transition region B with gradually increasing thickness, and an edge region C with gradually decreasing thickness. Typically, the pull roller R is clamped within either the central region A or the transition region B. If the pull roller R is clamped within the central region A, the long-term contact between the pull roller R and the sheet glass substrate 21 may scratch the central region of the glass substrate, leading to a decrease in product yield. Since the transition region B and the edge region C of the sheet glass substrate 21 will eventually be cut off and disposed of as waste, this will not cause a decrease in product yield. However, if the pull roller 4 is clamped within the transition region B, since the transition region B and the edge region C of the sheet glass substrate 21 will eventually be cut off and disposed of as waste, this will not cause a decrease in product yield. However, considering that the glass thickness gradually increases in the transition area B, if the conventional pull roller 4 is clamped in the transition area B, it will cause excessive pressing force in some local areas, which will easily cause scratches in the sheet glass substrate 21. In the subsequent cutting process, the scratches are likely to expand and cause the sheet glass substrate 21 to crack.

[0047] Therefore, based on the above problems, the pull roller R for forming glass substrates proposed in this disclosure can effectively solve these problems. For example... Figure 2 As shown, the pull-down rollers proposed in this disclosure are used in pairs, and in the pair of pull-down rollers, each pull-down roller R includes multiple pull-down single rollers ( Figure 2 Only four are shown in the diagram: the first pull-down roller 22, the second pull-down roller 23, the third pull-down roller 24, and the last pull-down roller 25. In practice, there can be three or more pairs connected in series. Each pull-down roller in the pull-down roller R is fixed to its respective connecting shaft 26. The pull-down rollers and connecting shafts 26 can be connected together by threaded connections or key connections. The spacing between the connecting shafts 26 of the paired pull-down rollers can be adjusted along the thickness direction of the substrate conveying channel D, i.e., the thickness direction of the sheet glass substrate 21. Furthermore... Figure 2 The individual pull-down rollers 22, 23, 24, and 25 can be freely extended and retracted to adjust their diameter, such as... Figure 1 As shown, for the purpose of illustration, this disclosure describes the outer roller in four equal parts. Figure 1 The pull-down single roller mainly consists of three parts: an inner ring bushing 31, a radial telescopic rod mechanism 32, and an outer ring roller segment 33 corresponding to each hydraulic rod telescopic mechanism. The radial telescopic rod mechanism 32 can extend and retract freely, and the hydraulic pressure of the hydraulic connecting rod can be precisely adjusted. The outer ring roller segments 33 are separate from each other and not connected.

[0048] In actual operation, the hydraulic telescopic rod mechanism in each pull-down single roller is first contracted to minimize the diameter of each pull-down single roller. Then, the spacing between the connecting shafts 26 is adjusted so that the outer ring roller of the last pull-down single roller 25 closest to the outermost edge along the width direction of the sheet glass substrate 21, i.e., along the width direction of the substrate conveying channel D, just contacts the transition area of ​​the sheet glass substrate 21. Then, the hydraulic telescopic rod mechanism of the other pull-down single rollers is adjusted in sequence so that the outer ring roller of the other groups of pull-down single rollers just contacts the transition area of ​​the sheet glass substrate 21. Then, the hydraulic pressure of the hydraulic telescopic rod mechanism in each group of pull-down single rollers is adjusted so that the pull-down rollers can normally transmit the sheet glass substrate 21 downwards. If the thickness of the transition area of ​​the sheet glass substrate 21 changes during actual production, the pressure sensor in the hydraulic telescopic rod mechanism can detect the pressure change, thereby allowing for flexible adjustment of the diameter of each set of pull-down rollers and the hydraulic pressure of the hydraulic telescopic rod mechanism. Through the above design, the problem of pull-down rollers easily causing scratches on the surface of the sheet glass substrate 21 in the prior art can be effectively solved.

[0049] In summary, the pull-down roller for glass substrate forming provided in this disclosure can adjust the diameter of the pull-down roller by adjusting the radial position of the outer roller segment 33 through the radial telescopic rod mechanism 32. When multiple pull-down rollers with different diameters are connected in series to form a pull-down roller R, the diameter of each pull-down roller can be reasonably adjusted according to the contact position between each pull-down roller and the edge area of ​​the glass substrate by adjusting the position of the outer roller segment 33 of each pull-down roller. This ensures that the pull-down roller and the glass substrate are in just-right contact. This original design can effectively improve the uniformity of the pressing force applied by the pull-down roller to the surface of the glass substrate, thereby suppressing the possibility of scratches. Meanwhile, the radial telescopic rod mechanism 32 inside each pull-down roller can adjust the pressing force applied to the surface of the glass substrate. Under the premise of ensuring that the pull-down roller can transmit the sheet glass substrate 21 normally, the magnitude of the pressing force is reduced as much as possible. This can further reduce the possibility of scratches caused by the pressing force applied to the surface of the glass substrate, thereby effectively improving the yield of the glass substrate.

[0050] The embodiments of this disclosure have now been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0051] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. A pull roller for forming glass substrates, characterized in that, The assembly includes a connecting shaft (26) and multiple pull-down rollers. Each pull-down roller includes an inner ring bushing (31) and outer ring roller segments (33) spaced apart in the circumferential direction. Each outer ring roller segment (33) is connected to the outer circumferential surface of the inner ring bushing (31) by a corresponding radial telescopic rod mechanism (32) so that it can move back and forth radially relative to the inner ring bushing (31) by the drive of the corresponding radial telescopic rod mechanism (32). The multiple pull-down rollers are fixed sequentially at intervals on the outer circumference of the connecting shaft (26) starting from the working end of the connecting shaft (26) along the axial direction of the connecting shaft (26). The diameter decreases sequentially from the first pull-down roller (22) closest to the working end to the last pull-down roller (25) furthest from the working end.

2. The drop roller for forming a glass substrate according to claim 1, characterized in that, The outer roller segments (33) are evenly spaced along the axial direction.

3. The drop roller for forming a glass substrate according to claim 1, characterized in that, The radial telescopic rod mechanism (32) is a hydraulic telescopic rod mechanism.

4. The glass substrate forming pull roller according to claim 3, characterized in that, The hydraulic telescopic rod mechanism includes a pressure detection device for detecting working pressure.

5. The drop roller for forming a glass substrate according to claim 1, characterized in that, The inner ring bushing (31) of each of the pull-down single rollers is threaded or keyed to the connecting shaft (26).

6. The glass substrate forming pull roller according to any one of claims 1 to 5, characterized in that, The number of the plurality of pull-down rollers is ≥3.

7. A glass substrate forming apparatus, characterized in that, The system includes a forming chamber (II) and an annealing chamber (III) arranged sequentially below a glass melt overflow tank (11). The forming chamber (II) and the annealing chamber (III) have a substrate transport channel (D) for the sheet glass substrate (21) to pass through during production. The annealing chamber (III) has a plurality of pull roller groups spaced apart in the vertical direction arranged sequentially along the substrate transport channel (D). Each pull roller group includes a pair of pull rollers arranged on both sides of the substrate transport channel (D) in the width direction for clamping the edge portion of the sheet glass substrate. Each of the pull roller pairs on both sides includes pull rollers arranged at intervals relative to each other in the thickness direction of the substrate transport channel (D). The pull rollers are pull rollers (R) for forming glass substrates according to any one of claims 1 to 6.

8. The glass substrate forming apparatus according to claim 7, characterized in that, The connecting shaft (26) of each of the pull-down rollers is arranged to be adjustable in position along the thickness direction of the substrate conveying channel (D).

9. The glass substrate forming apparatus according to claim 7, characterized in that, The glass substrate forming apparatus is divided from top to bottom into: an overflow chamber (I), a forming chamber (II) and an annealing chamber (III) including the glass melt overflow tank (11), wherein a partition plate (15) is provided between the overflow chamber (I) and the forming chamber (II), and a plurality of heat insulation plates (18) are provided at intervals along the vertical direction in the annealing chamber (III).

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