Rotary etching device for glass etching and method for preparing foldable glass

Abstract

The present invention proposes a rotary etching device for glass etching and a method for preparing foldable glass, wherein the rotary etching device comprises a storage table, at least one limiting tube and at least one etching tube. The limiting tube is located above the storage table and extends in the horizontal direction, the bottom of the limiting tube is open and the width of the opening is adjustable, the opening is used to limit the etching range, the etching tubes are matched in the limiting tubes one by one and are movably arranged between the etching position and the lifting position, and the etching tubes are coated with a foam layer. The rotary etching device provided by the present invention can adjust the etching range of the glass by adjusting the size of the opening, and the adjustment method is simple and quick. The etching depth of the glass can be adjusted by adjusting the up and down movement of the etching tube. The etching tube only contacts a small area of ​​the glass, and there is almost no waste of etching liquid, which can save a lot of costs.

Description

Technical Field

[0001] The invention relates to the field of glass, and in particular to a rotary etching device for glass etching and a method for preparing foldable glass. Background Art

[0002] At present, foldable mobile phones are of great interest in the market, and the requirements for the preparation of cover glass for foldable mobile phones are gradually increasing. In order to meet the bendable characteristics of glass, the bending area needs to be very thin. There are currently two process routes: one is overall thinning of the glass (UTG), and the other is thinning only in the middle bending area (CFG). The overall thinned UTG glass has uniform thickness, high appearance flatness, and good optical effect. However, it adopts an overall thinning process, and the overall thickness is thin, the impact resistance is poor, and it is easy to break when impacted by external forces. Therefore, the middle bendable glass (CFG) with thin middle and thick sides has attracted attention. Since it only thins the bending area of ​​the glass, it has good overall impact resistance and is not easy to break. However, the production process of the middle bendable glass is complicated, the etching range is not easy to adjust, and the etching liquid easily penetrates into the non-etching area during the etching process, resulting in poor etching on the back or both sides, low finished product yield, and uneven etching and different etching thicknesses are common, causing glass curling. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art to at least some extent. To this end, an embodiment of the present invention provides a rotary etching device for glass etching. An embodiment of the present invention also provides a method for preparing foldable glass, which is used to prepare a middle bendable glass that is thin in the middle and thick on both sides.

[0004] The rotary etching device for glass etching provided by an embodiment of the present invention comprises: a storage table, which is used to place glass; at least one limiting tube, which is located above the storage table and extends in a horizontal direction, the bottom of the limiting tube is open and the width of the opening is adjustable, and the opening is used to limit the etching range; at least one etching tube, which is matched in the limiting tube in a one-to-one correspondence and is movably arranged between an etching position and a lifting position, the etching tube is coated with a foam layer, and a plurality of etching holes are provided on the etching tube so that etching liquid can penetrate into the foam layer through the etching holes. At the etching position, the etching tube drives the foam layer to rotate, and the foam layer contacts the glass to achieve etching. At the lifting position, the foam layer is separated from the glass.

[0005] The rotary etching device provided by the embodiment of the present invention includes a limit tube with an adjustable bottom opening size. By adjusting the size of the opening, the etching range of the glass can be adjusted, and the adjustment method is simple and fast. At the etching position, the etching tube drives the foam layer to rotate so that the etching liquid adsorbed in the foam layer can contact the glass more evenly, making the etching process more reliable and the etching effect better.

[0006] In some embodiments, the limiting tube includes a tube body and two pressing parts, the two pressing parts are respectively arranged on both sides of the opening and extend outward, and the pressing parts are used to abut against the glass to limit the etching range.

[0007] In some embodiments, the limiting tube is a flexible tube, or a sealing structure is provided at a portion where the limiting tube contacts the etching surface to prevent the etching solution from flowing out of the etching range.

[0008] In some embodiments, there are multiple etching tubes, and the rotary etching device includes a liquid inlet main pipe and a liquid outlet main pipe. The liquid inlet main pipe is connected to the liquid inlets of the multiple etching tubes to input etching liquid, and the liquid outlet main pipe is connected to the liquid outlets of the multiple etching tubes to collect and output the etching liquid.

[0009] In some embodiments, the etching tube is movably disposed in a first horizontal direction perpendicular to its extending direction.

[0010] In some embodiments, the rotary etching device includes an automatic pressurizing device, which acts on at least one end of the etching tube to drive the etching tube to move between the etching position and the lifting position.

[0011] In some embodiments, the automatic pressurizing device is further used to pressurize the etching tube at the etching position downward to increase the contact area between the foam layer and the glass.

[0012] In some embodiments, the rotary etching device also includes a flushing system, which includes an inlet pipe and an outlet pipe. The inlet pipe is connected to the limit pipe for flushing, and the outlet pipe is connected to the limit pipe for collecting and outputting waste water to the limit pipe.

[0013] In some embodiments, a water inlet and a water outlet are provided on the side wall of the limiting tube, the water inlet and the water outlet are spaced apart in the extension direction of the limiting tube, the water inlet pipe is connected to the water inlet, and the water outlet pipe is connected to the water outlet.

[0014] In some embodiments, the position of the limiting tube is relatively fixed, or the limiting tube moves with the etching tube, and at the etching position, the bottom of the limiting tube abuts against the glass.

[0015] A method for preparing foldable glass according to another embodiment of the present invention comprises the following steps:

[0016] Step 1: glass etching, specifically comprising placing the glass to be etched on the storage table and placing the etching tube in the raised position; adjusting the size of the opening of the limiting tube, moving the etching tube to the etching position and making the opening of the limiting tube abut against the etching surface of the glass; driving the etching tube to rotate to drive the foam layer to rotate, and the foam layer contacts the etching surface of the glass to achieve etching; after etching is completed, the etching tube moves to the raised position so that the foam layer is separated from the glass;

[0017] Step 2: Rinse the etched glass surface with water;

[0018] Step 3: Thinning: put the rinsed glass into an etching solution for overall thinning, and finally cut and strengthen it to obtain foldable glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is a schematic structural diagram of a rotary etching device for glass etching according to an embodiment of the present invention.

[0020] Figure 2 It is a cross-sectional view of the limiting tube, etching tube and foam layer of an embodiment of the present invention (wherein the etching tube is in a raised position).

[0021] Figure 3 It is a cross-sectional view of the limiting tube, etching tube and foam layer of an embodiment of the present invention (wherein the etching tube is located at the etching position).

[0022] Reference numerals:

[0023] The storage platform 1, the limiting tube 2, the opening 21, the tube body 22, the pressing part 23, the etching tube 3, the foam layer 31, the glass 4, the liquid inlet main pipe 51, the liquid outlet main pipe 52, the automatic pressurizing device 6, the water inlet pipe 71, the water inlet branch 711, the water outlet pipe 72, the water outlet branch 721, DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] According to the following Figure 1-Figure 3 The basic structure of the rotary etching device for glass etching according to the embodiment of the present invention is described as follows: The rotary etching device comprises a placing table 1 , at least one limiting tube 2 and at least one etching tube 3 .

[0026] The storage table 1 is used to place the glass 4. Optionally, the glass 4 is a large plate glass. The limiting tube 2 is located above the storage table 1 and extends in the horizontal direction. It can also be said that the extension direction of the limiting tube 2 is parallel to the upper surface of the glass 4. The bottom of the limiting tube 2 has an opening 21 and the width of the opening 21 is adjustable. The opening 21 is used to limit the etching range. It can be understood that the extension direction of the opening 21 is the same as the extension direction of the limiting tube 2, and the width direction of the opening 21 is perpendicular to its extension direction.

[0027] The etching tubes 3 are matched one by one in the limiting tubes 2 and are movably arranged between the etching position and the lifting position. The etching tubes 3 are covered with a foam layer 31. The etching tubes 3 are provided with a plurality of etching holes (not shown in the figure) so that the etching liquid can penetrate into the foam layer 31 through the etching holes. In the etching position, the etching tubes 3 drive the foam layer 31 to rotate, and the foam layer 31 contacts the glass 4 to achieve etching. In the lifting position, the foam layer 31 is separated from the glass 4.

[0028] In other words, the etching tube 3 fits in the corresponding limiting tube 2 and has a certain movable space in the up and down directions, and the etching position is located below the lifting position. The foam layer 31 coated on the outside of the etching tube 3 is used to absorb the etching liquid and contact the glass 4 at the etching position, and the etching liquid absorbed in the foam layer 31 etches the glass 4. It can be understood that since the foam layer 31 and the etching tube 3 are both located inside the limiting tube 2, the contact etching range of the foam layer 31 and the glass 4 can be determined by the bottom opening 21 of the limiting tube 2. In other words, the etching range of the glass 4 can be adjusted by adjusting the size of the opening 21. After the etching is completed, the etching tube 3 moves to the lifting position, and the etching tube 3 drives the foam layer 31 upward to leave the surface of the glass 4.

[0029] The rotary etching device provided by the embodiment of the present invention can be used to prepare a middle bendable glass that is thin in the middle and thick on both sides, including a limiting tube with an adjustable bottom opening size. By adjusting the size of the opening, the etching range of the glass can be adjusted. The adjustment method is simple and quick, and the opening limits the etching range to prevent the etching liquid from penetrating into the non-etching area, thereby improving the yield rate. In the etching position, the etching tube drives the foam layer to rotate so that the etching liquid adsorbed in the foam layer can contact the glass more evenly, making the etching process more reliable and the etching effect better. The etching depth of the glass can be adjusted by adjusting the up and down movement of the etching tube. The adjustment method is simple and quick. At the same time, the etching tube only contacts a small area of ​​the glass, and there is almost no waste of etching liquid, which can save a lot of cost.

[0030] According to the following Figure 1-Figure 3 A specific embodiment of the present invention is described.

[0031] like Figure 1As shown, the rotary etching device comprises a storage platform 1, a plurality of position limiting tubes 2 and a plurality of etching tubes 3. The plurality of etching tubes 3 are arranged parallel to each other in a horizontal direction. The plurality of etching tubes 3 are matched in the plurality of position limiting tubes 2 in a one-to-one correspondence.

[0032] Optionally, the position limiting tube 2 is a flexible tube, or the position limiting tube 2 can be a rigid tube, which uses a mechanical structure to adjust the size of the opening 21, and a sealing structure is provided at the position where the position limiting tube 2 contacts the etching surface to prevent the etching liquid from flowing out of the etching range. In this embodiment, the position limiting tube 2 is a flexible tube, and since the position limiting tube 2 is flexible, the size of the opening 21 can be adjusted, and since the position limiting tube 2 is a flexible tube, the position limiting tube 2 can form a good sealing relationship with the etching surface without the need to provide an additional sealing structure.

[0033] In order to better limit the etching range, improve the etching accuracy, and avoid the foam layer 31 from contacting the non-etched area of ​​the glass 4 to cause etching failure. Figure 2 and Figure 3 As shown, the limiting tube 2 includes a tube body 22 and two pressing parts 23, the two pressing parts 23 are respectively arranged on both sides of the opening 21 and extend outward, and the pressing parts 23 are used to abut against the glass 4 to limit the etching range. In other words, when etching the glass 4, the pressing parts 23 are adjusted to abut against the upper surface of the glass 4, thereby limiting the etching range of the upper surface of the glass 4, preventing the foam layer 31 from contacting the non-etching area, and preventing the etching liquid from flowing out of the limiting tube 2, causing etching failure.

[0034] Furthermore, if Figure 1 As shown, the rotary etching device includes a liquid inlet manifold 51 and a liquid outlet manifold 52. The liquid inlet manifold 51 is communicated with the liquid inlets of the plurality of etching tubes 3, and the liquid outlet manifold 52 is communicated with the liquid outlets of the plurality of etching tubes 3. In the present embodiment, the liquid inlet and the liquid outlet of the etching tube 3 are respectively located at both ends in the extension direction thereof. In other embodiments, the liquid inlet and the liquid outlet may have other settings, such as being arranged on the side wall of the etching tube 3. The side wall of the etching tube 3 is provided with a plurality of etching holes penetrating the side wall thereof. Preferably, in order to make the etching liquid more evenly distributed and the etching effect better, the plurality of etching holes are evenly distributed on the side wall of the etching tube 3.

[0035] The liquid inlet manifold 51 is used to input etching liquid into the etching tube 3. The etching liquid flows along the etching tube 3. A part of the etching liquid flows out through the etching holes on the wall of the etching tube 3. The excess etching liquid flows out from the liquid outlet of the etching tube 3 and is collected and output to the liquid outlet manifold 52. Preferably, the excess etching liquid can enter the next cycle to participate in etching again.

[0036] The outer side of each etching tube 3 is coated with a foam layer 31, and the etching liquid flowing out of the etching hole of the etching tube 3 extends into the foam layer 31, so that the foam layer 31 is filled with the etching liquid. The foam layer 31 is elastic, can better contact with the etching area of ​​the glass 4, and can slowly release the etching liquid, so that the etching is more uniform and accurate. Optionally, the foam layer 31 is a polytetrafluoro porous foam.

[0037] like Figure 1 As shown, the rotary etching device of this embodiment includes an automatic pressurizing device 6, which acts on at least one end of the etching tube 3 to drive the etching tube 3 to move between the etching position and the lifting position. In other words, the automatic pressurizing device 6 is a driving device that drives the etching tube 3 to move in the up and down directions.

[0038] Furthermore, the automatic pressurizing device 6 is also used to pressurize the etching tube 3 at the etching position downward to increase the contact area between the foam layer 31 and the glass 4. When the etching tube 3 is at the etching position, the foam layer 31 can contact the glass 4, and the automatic pressurizing device 6 presses the etching tube 3 downward, which can gradually increase the contact area and strength between the foam layer 31 and the glass 4, so that the etching depth can be controlled by pressure and etching time. It can be understood that in the above process, the contact range between the foam layer 31 and the glass 4 will not exceed the range of the opening 21.

[0039] In this embodiment, if Figure 2 and Figure 3 As shown, the position of the limiting tube 2 is fixed, and the opening size of the limiting tube 2 is adjustable. The etching tube 3 drives the foam layer 31 to move up and down in the limiting tube 2. In other embodiments, the limiting tube 2 can also move up and down with the etching tube 3. For example, after etching, the limiting tube 2 and the etching tube 3 move upward together to leave the surface of the glass 4 under the action of the automatic pressurizing device 6, or, when the automatic pressurizing device 6 drives the etching tube 3 to move upward, the etching tube 3 drives the limiting tube 2 to move upward, that is, the limiting tube 2 can move upward under the drive of the etching tube 3. In the process of moving to the etching position, the etching tube 3 drives the limiting tube 2 to move downward until the pressing portion 23 (i.e., the bottom of the etching tube 3) contacts the upper surface of the glass 4 to reach the etching position.

[0040] The rotary etching device in this embodiment also includes a flushing system, which includes an inlet pipe 71 and an outlet pipe 72. The inlet pipe 71 is connected to the limiting pipe 2 for flushing, and the outlet pipe 72 is connected to the limiting pipe 2 for collecting and outputting waste water to the limiting pipe 2.

[0041] Specifically, Figure 1As shown, the flushing system includes a plurality of water inlet manifolds 711 and a plurality of water outlet manifolds 721. The plurality of water inlet manifolds 711 correspond one-to-one to the plurality of position limiting tubes 2, and the plurality of water outlet manifolds 721 correspond one-to-one to the plurality of position limiting tubes 2. A water inlet and a water outlet are provided on the side wall of the position limiting tube 2, and the water inlet and the water outlet are arranged at intervals in the extension direction of the position limiting tube 2, and the corresponding water inlet manifold 711 is connected to the water inlet, and the corresponding water outlet manifold 721 is connected to the water outlet.

[0042] The water inlet pipe 71 is connected to each water inlet branch 711 and is used to input flushing water into the water inlet branch 711. The water in the water inlet branch 711 flows into the limiting pipe 2 through the water inlet and flushes the etching liquid remaining on the etching area of ​​the glass 4. The waste water flows out from the water outlet of the limiting pipe 2 and enters the water outlet branch 721. The waste water in several water outlet branches 721 is collected in the water outlet pipe 72 and flows into the waste liquid tank.

[0043] Further, in order to make the rotary etching device in this embodiment more applicable, the etching tube 3 is movably arranged in a horizontal direction perpendicular to its extension direction. Specifically, the rotary etching device has a slide rail, and the etching tube 3 can move along the slide rail. Preferably, the position of each etching tube 3 can be adjusted separately to make the rotary etching device more applicable. In other embodiments, the adjusting device of the rotary etching device can adjust the etching tube 3 in other known ways, such as using a movable gear shaft, which will not be described in detail here.

[0044] Further, the rotary etching device includes a rotary driving device, which acts on the etching tube 3 to drive the etching tube 3 to rotate. In this embodiment, the rotary driving device is a servo motor.

[0045] A method for preparing foldable glass according to another embodiment of the present invention comprises the following steps:

[0046] Step 1: glass etching, which can adopt the rotary etching device of any of the above embodiments, specifically comprising placing the glass to be etched on the storage table and placing the etching tube in the raised position; adjusting the size of the opening of the limiting tube, moving the etching tube to the etching position and making the opening of the limiting tube abut against the etching surface of the glass; driving the etching tube to rotate to drive the foam layer to rotate, and the foam layer contacts the etching surface of the glass to achieve etching; after etching is completed, the etching tube moves to the raised position so that the foam layer is separated from the glass, thereby obtaining glass with a concave middle portion;

[0047] Step 2: Rinse the etched glass surface with water;

[0048] Step 3: Thinning: put the rinsed glass into an etching solution for overall thinning, and finally cut and strengthen it to obtain foldable glass.

[0049] Below Figure 1-Figure 3 A specific embodiment of a method for preparing foldable glass is described as an example.

[0050] When in use, place the glass 4 on the storage table 1, select the appropriate number of etching tubes 3 according to the requirements of the etching drawings, and adjust the position of the etching tubes 3 through the adjusting device and fix them. Make the etching tube 3 in the lifting position, adjust the bottom opening 21 of the limiting tube 2 to a suitable size, and make the pressing part 23 against the glass 4. The automatic pressurizing device 6 drives the etching tube 6 to move to the etching position, the foam layer 31 contacts the upper surface of the glass 4, and the automatic pressurizing device 6 adjusts the applied pressure, and the rotary drive device drives the etching tube 6 to drive the foam layer 31 to rotate, and the etching liquid in the foam layer 31 etches the glass 4. After the etching is completed, the pressure is released, and the etching tube 6 is driven to move to the lifting position, and the foam layer 31 is gradually separated from the glass 4 to obtain a glass with a concave middle part. Turn on the flushing system to rinse the glass surface, clean the residual etching liquid, put the whole piece of glass into the etching liquid for overall thinning, and finally cut it to strengthen it to obtain a foldable glass with a thinned middle bending area.

[0051] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A rotary etching device for glass etching, characterized in that: include: A storage table (1), wherein the storage table (1) is used to place glass (4); at least one limiting tube (2), the limiting tube (2) being located above the storage platform (1) and extending in a horizontal direction, the bottom of the limiting tube (2) being open (21) and the width of the opening (21) being adjustable, the opening (21) being used to limit an etching range; At least one etching tube (3), the etching tube (3) being matched in a one-to-one correspondence in the limiting tube (2) and being movably arranged between an etching position and a lifting position, the etching tube (3) being coated with a foam layer (31), the etching tube (3) being provided with a plurality of etching holes so that etching liquid can penetrate into the foam layer (31) through the etching holes, in the etching position, the etching tube (3) drives the foam layer (31) to rotate, the foam layer (31) contacts the etching surface of the glass (4) to achieve etching, and in the lifting position, the foam layer (31) is separated from the glass (4); A liquid inlet main pipe (51) and a liquid outlet main pipe (52), wherein the liquid inlet main pipe (51) is connected to the liquid inlet of the etching tube (3) to input etching liquid, and the liquid outlet main pipe (52) is connected to the liquid outlet of the etching tube (3) to collect and output the etching liquid.

2. The rotary etching device for glass etching according to claim 1, characterized in that: The limiting tube (2) comprises a tube body (22) and two pressing parts (23), wherein the two pressing parts (23) are respectively arranged on both sides of the opening (21) and extend outwards, and the pressing parts (23) are used to abut against the etching surface of the glass (4) to limit the etching range.

3. The rotary etching device for glass etching according to claim 1 or 2, characterized in that: The limiting tube is a flexible tube, or a sealing structure is provided at a position where the limiting tube contacts the etching surface to prevent the etching liquid from flowing out of the etching range.

4. The rotary etching device for glass etching according to claim 1, characterized in that: The etching tubes (3) are multiple.

5. The rotary etching device for glass etching according to claim 1 or 4, characterized in that: The etching tube (3) is movably arranged in a first horizontal direction perpendicular to its extending direction.

6. The rotary etching device for glass etching according to claim 1, characterized in that: It comprises an automatic pressurizing device (6), which acts on at least one end of the etching tube (3) to drive the etching tube (3) to move between the etching position and the lifting position.

7. The rotary etching device for glass etching according to claim 6, characterized in that: The automatic pressurizing device (6) is also used to pressurize the etching tube (3) located at the etching position downward.

8. The rotary etching device for glass etching according to claim 1, characterized in that: It also comprises a flushing system, the flushing system comprising a water inlet pipe (71) and a water outlet pipe (72), the water inlet pipe (71) being connected to the limit pipe (2) for flushing, and the water outlet pipe (72) being connected to the limit pipe (2) for collecting and outputting waste water to the limit pipe (2).

9. The rotary etching device for glass etching according to any one of claims 1, 6-8, characterized in that: The position of the limiting tube (2) is relatively fixed, or the limiting tube (2) moves with the etching tube (3), and at the etching position, the bottom of the limiting tube (2) abuts against the etching surface of the glass.

10. A method for preparing foldable glass, characterized in that: The following steps are involved: Step 1: etching glass, using the rotary etching device according to any one of claims 1 to 9 to perform etching, specifically comprising placing the glass to be etched on the storage table (1) and placing the etching tube (3) in the raised position; adjusting the size of the opening (21) of the limiting tube (2), moving the etching tube (3) to the etching position and making the opening (21) of the limiting tube (2) abut against the etching surface of the glass; driving the etching tube (3) to rotate to drive the foam layer (31) to rotate, so that the foam layer (31) contacts the etching surface of the glass (4) to achieve etching; after etching is completed, the etching tube (3) moves to the raised position so that the foam layer (31) is separated from the glass (4), thereby obtaining glass with a concave middle portion; Step 2: Rinse the etched glass surface with water; Step 3: Thinning: put the rinsed glass into an etching solution for overall thinning, and finally cut and strengthen it to obtain a foldable glass with a bendable middle.

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