Overflow forming device for carrier plate glass

Abstract

The utility model relates to a carrier plate glass overflow forming device which comprises an overflow brick body, a baffle assembly, a supporting cross beam and a supporting assembly, the overflow brick body comprises an upper overflow body and a lower overflow body, and a supporting channel penetrating in the length direction of the lower overflow body is formed in the lower overflow body; the supporting cross beam is detachably connected in the supporting channel; the supporting assemblies are arranged at the two ends of the overflow brick body respectively, each supporting assembly comprises a supporting base and a supporting table arranged on the supporting base, a supporting groove is formed in each supporting table, and the supporting cross beams are used for fixedly connecting the overflow brick body to the supporting assemblies besides providing a supporting effect on the overflow groove and reducing deformation of the overflow groove. The two ends of the supporting cross beam are supported in the corresponding supporting grooves respectively. The overflow brick body is supported and fixed more conveniently and quickly, the connecting and assembling efficiency is improved, and positioning is more accurate.

Description

Technical Field

[0001] The utility model belongs to the technical field of carrier glass manufacturing, and specifically relates to an overflow forming device for carrier glass. Background Art

[0002] Carrier glass is an extremely flat thin glass sheet, which is made into a transparent conductive pattern through photolithography processing. It is a core component in the upstream of liquid crystal panels. The manufacturing of carrier glass requires high precision. In the forming stage, it can mainly be through the float method, the flow hole down-drawing method, and the overflow melting method, etc. The overflow melting technology can produce an ultra-thin glass substrate with two original glass surfaces. Compared with the float method and the flow hole down-drawing method, it can avoid post-processing processes such as grinding or polishing, and has now become the mainstream of the substrate glass manufacturing process.

[0003] The overflow melting method mainly forms molten glass through an overflow forming device. The molten glass is conveyed into the overflow tank in the overflow forming device. After the molten glass reaches the volume upper limit in the overflow tank, it overflows from the overflow tank to form a sheet-shaped substrate. Due to the high temperature of the molten glass, the overflow tank undergoes high-temperature creep under high-temperature conditions, resulting in the problem of the overflow tank sagging and deforming, causing uneven forming thickness of the carrier glass and poor finished product effect. In addition, the overflow forming device also has the disadvantages of great support difficulty and high positioning difficulty. Summary of the Invention

[0004] The purpose of the utility model is to provide an overflow forming device for carrier glass to solve the problems existing in the prior art, such as the overflow tank of the overflow forming device for producing carrier glass undergoes high-temperature creep under high-temperature conditions, resulting in sagging of the overflow tank, great installation and support difficulty of the overflow forming device, and high positioning difficulty, etc.

[0005] To achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions to be realized:

[0006] The utility model provides an overflow forming device for carrier glass, which includes:

[0007] An overflow brick body, which includes an upper overflow body and a lower overflow body. The lower overflow body is located below the upper overflow body. An overflow tank is formed in the upper overflow body, and the overflow tank is a structure with an open upper part. Guide walls are formed on both sides of the lower overflow body. A support channel is formed in the lower overflow body and runs through the lower overflow body along the length direction.

[0008] A baffle assembly, which includes a first baffle piece and a second baffle piece respectively formed at both ends of the overflow tank, and the upper edges of the first baffle piece and the second baffle piece are higher than the overflow tank.

[0009] A support cross beam, which is detachably connected in the support channel.

[0010] Two support components, the support components are respectively arranged at both ends of the overflow brick body, each support component includes a support base and a support platform arranged on the support base, a support groove is formed on the support platform, and both ends of the support cross beam are respectively supported in the corresponding support grooves.

[0011] In some embodiments of the present application, the cross-sectional dimension of the support channel gradually decreases from top to bottom, the top surface of the support channel is a plane, and the shape of the support cross beam is adapted to the support channel.

[0012] In some embodiments of the present application, the top surface of the support channel is a convex arc surface, and the shape of the support cross beam is adapted to the support channel.

[0013] In some embodiments of the present application, the cross-sectional dimension of the support groove gradually decreases along its depth direction, and at least part of the support cross beam is connected in the support groove.

[0014] In some embodiments of the present application, a limiting support member is further arranged on the support base, the length direction of the limiting support member is perpendicular to the length direction of the support cross beam, a limiting groove is formed on the limiting support member along its length direction, a limiting notch with a downward opening is formed on the support cross beam, the position of the limiting notch is adapted to the limiting groove, and the limiting notch is connected in the limiting groove through a limiting block.

[0015] In some embodiments of the present application, an avoidance portion is further arranged on the limiting support member, and the support cross beam passes through the avoidance portion and is supported on the support platform.

[0016] In some embodiments of the present application, a docking portion is arranged on the first baffle member, the docking portion is used for connecting with the feeding component, and a flow regulating component is arranged on the docking portion for regulating the flow rate of the molten glass input into the overflow groove.

[0017] In some embodiments of the present application, a flow dividing portion is formed on one side of the second baffle member close to the overflow groove, and the flow dividing portion gradually decreases along the direction away from the second baffle member.

[0018] In some embodiments of the present application, the depth of the overflow groove gradually decreases along the direction from the first baffle member to the second baffle member.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are:

[0020] The overflow forming device for carrier glass involved in the present application has a support channel formed in the lower overflow body. A support cross beam is connected in the support channel. In addition to providing support for the overflow trough and reducing the deformation of the overflow trough, the support cross beam is also used to fixedly connect the overflow brick body to the support assembly. The two ends of the support cross beam are correspondingly supported in the support grooves, which more conveniently and quickly realizes the support and fixation of the overflow brick body, improves the connection and assembly efficiency, and the overflow brick body is positioned more accurately in the vertical and horizontal directions through the connection and positioning of the limit notch on the support cross beam by the limit block and the limit groove of the limit support member.

[0021] After reading the specific implementation manners of the present utility model in conjunction with the accompanying drawings, other features and advantages of the present utility model will become clearer. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 is the structural schematic diagram of the overflow forming device for carrier glass proposed by the present utility model;

[0024] Figure 2 is Figure 1 the exploded schematic diagram of the overflow forming device for carrier glass in

[0025] Figure 3 is one of the connection schematic diagrams of the support cross beam and the overflow brick body;

[0026] Figure 4 is the structural schematic diagram of the overflow brick body;

[0027] Figure 5 is the second connection schematic diagram of the support cross beam and the overflow brick body;

[0028] Figure 6 is the connection schematic diagram of the adjusting assembly on the docking part;

[0029] Figure 7 is Figure 6 the exploded schematic diagram of the adjusting assembly in

[0030] Figure 8 is the connection schematic diagram of the docking assembly and the fixed ring plate;

[0031] Figure 9 is the structural schematic diagram of the rotating ring plate;

[0032] Figure 10It is a schematic diagram of the rotating blade structure;

[0033] In the figure,

[0034] 100, overflow brick body; 110, upper overflow body; 111, overflow groove; 120, lower overflow body; 121, diversion wall; 122, support channel; 130, shunt part;

[0035] 200, baffle assembly; 210, first baffle member; 220, second baffle member; 230, docking part; 231, docking port;

[0036] 300, feeding pipe group;

[0037] 400, support cross beam; 410, limit notch;

[0038] 500, support assembly; 510, support base; 520, support platform; 521, support groove; 530, limit support member; 531, limit groove; 532, avoidance part; 540, limit block;

[0039] 600, adjustment assembly;

[0040] 610, fixed ring plate; 611, rotating base; 620, rotating ring plate; 621, movable guide groove; 622, tooth-shaped section; 630, rotating blade group; 631, rotating blade; 632, first connection part; 633, second connection part; 640, driving part; 641, driving motor; 642, transmission gear. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0042] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In this utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0046] The following disclosure provides many different embodiments or examples for implementing different structures of this utility model. To simplify the disclosure of this utility model, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit this utility model. In addition, this utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and / or arrangements discussed.

[0047] Reference Figures 1 - 4 , this application provides a carrier plate glass overflow forming device, which includes an overflow brick body 100, a baffle assembly 200, a support cross beam 400 and a support assembly 500.

[0048] The overflow brick body 100 includes an upper overflow body 110 and a lower overflow body 120. The lower overflow body 120 is located below the upper overflow body 110, and the upper overflow body 110 and the lower overflow body 120 are an integrally formed structure.

[0049] An overflow groove 111 is formed in the upper overflow body 110. The two sides of the overflow groove 111 are overflow weirs. The overflow groove 111 has an open structure at the upper part and is used to hold the molten glass for forming the carrier glass plate.

[0050] Flow guiding walls 121 are formed on both sides of the lower overflow body 120. After the molten glass in the overflow groove 111 reaches the upper limit of accommodation, it overflows downward from the overflow weirs on both sides of the overflow groove 111, forms a sheet-like substrate along the surface of the flow guiding walls 121, and finally is pulled by the traction rollers in the forming area to form the carrier glass plate.

[0051] The baffle assembly 200 includes a first baffle member 210 and a second baffle member 220 respectively formed at both ends of the overflow groove 111. The upper edges of the first baffle member 210 and the second baffle member 220 are higher than the overflow groove 111 to prevent the molten glass from overflowing from both ends of the overflow groove 111.

[0052] Since the overflow brick body 100 is prone to high-temperature creep under high-temperature conditions, as a result, the middle position of the overflow groove 111 sags, resulting in uneven thickness during the production of the carrier glass plate and affecting the display imaging effect.

[0053] To solve the above problems, a support channel 122 running through the lower overflow body 120 along its length direction is formed in the lower overflow body 120 in this application.

[0054] A support cross beam 400 is connected in the support channel 122. The support cross beam 400 runs through the support channel 122 and plays a supporting role for the overflow brick body 100, reducing the sagging phenomenon of the overflow groove 111. Moreover, the support cross beam 400 can also play a supporting role for the entire overflow brick body 100, facilitating its fixation.

[0055] The depth of the overflow groove 111 gradually decreases along the direction from the first baffle member 210 to the second baffle member 220.

[0056] Reference Figure 3 As shown in [reference number], a diversion part 130 is formed on the side of the second baffle member 220 close to the overflow groove 111. The diversion part 130 is located in the overflow groove 111 and tapers along the direction away from the second baffle member 220.

[0057] The diversion part 130 is used to divert the molten glass towards the overflow weir direction, reducing the impact of the molten glass on the second baffle member 220.

[0058] In some embodiments of this application, a support assembly 500 is respectively arranged at both ends of the overflow brick body 100. Each support assembly 500 includes a support base 510 and a support platform 520 arranged on the support base 510. A support groove 521 is formed on the support platform 520, and both ends of the support cross beam 400 are respectively supported in the corresponding support grooves 521.

[0059] The support base 510 is installed at a preset working height through a support structure such as a bracket, and the overflow brick body 100 is fixedly supported on the support assembly 500 through the support cross beam 400.

[0060] In some embodiments of the present application, in order to improve the connection stability between the support channel 122 and the support cross beam 400 and enhance the support effect of the support cross beam 400 on the overflow groove 111, in some embodiments of the present application, the cross-sectional dimension of the support channel 122 is designed to gradually decrease from top to bottom, the top surface of the support channel 122 is a plane, and the shape of the support cross beam 400 is adapted to the support channel 122.

[0061] That is, the cross-sections of the support channel 122 and the support cross beam 400 are formed into a triangle. Preferably, it is an isosceles triangle with the bottom surface of the triangle facing up and the tip facing down.

[0062] In other embodiments, the top surface of the support channel 122 can also be designed as a convex arc surface, and the shape of the support cross beam 400 is adapted to the support channel 122. The convex arc surface can further increase the contact area of the support cross beam 400 and avoid problems such as stress concentration.

[0063] The cross-sectional width dimension of the support groove 521 gradually decreases along its depth direction, and at least a part of the support cross beam 400 is connected in the support groove 521.

[0064] The support platform 520 is used to support the support cross beam 400. In addition, a limit support member 530 is provided on the support base 510 to limit the horizontal direction of the support cross beam 400.

[0065] Combined Figure 1 、 Figure 2 and Figure 5 , the length direction of the limit support member 530 is perpendicular to the length direction of the support cross beam 400. A limit groove 531 is formed along the length direction of the limit support member 530. A limit notch 410 with an opening downward is formed on the support cross beam 400. The position of the limit notch 410 is adapted to the limit groove 531, and the limit notch 410 is connected in the limit groove 531 through a limit block 540.

[0066] The limit support member 530 is located on one side of the support base 510 close to the overflow brick body 100. During installation, after both ends of the support cross beam 400 are respectively connected in the support groove 521, the limit block 540 is pushed into the limit notch 410 from the limit groove 531 to limit the horizontal direction of the support cross beam 400.

[0067] Further, in order to limit the horizontal position between the support cross beam 400 and the overflow brick body 100, the distance between the support bases 510 at both ends can be designed to be adapted to the maximum size of the baffle assemblies 200 at both ends of the overflow brick body 100, so as to limit the horizontal position of the overflow brick body 100.

[0068] Alternatively, a horizontal limiting structure can also be designed on the support base 510. By means of structures such as horizontally adjustable screws, the two ends of the overflow brick body 100 are limited, and then the overflow brick body 100 is supported and limited in all directions.

[0069] The screw can be movably connected to the support base 510 in a threaded connection manner. After the overflow brick body 100 is installed, the screws at both ends are respectively moved to the ends to abut against the first baffle member 210 and the second baffle member 220 for limiting.

[0070] In some other embodiments of the present application, an avoidance portion 532 is further provided on the limit support member 530. The support cross beam 400 passes through the avoidance portion 532 and is supported on the support platform 520 to prevent the support cross beam 400 from interfering with the limit support member 530.

[0071] In some embodiments of the present application, a docking portion 230 is provided on the first baffle member 210. The docking portion 230 is used to connect with the feeding assembly. The feeding assembly includes a feeding pipe group 300, and the feeding pipe group 300 conveys molten glass into the overflow groove 111 through the feeding pipe group 300.

[0072] The docking portion 230 is detachably connected to the first baffle member 210 to adapt to overflow brick bodies 100 of different lengths, so as to produce carrier glass with different width dimensions, and the versatility is stronger.

[0073] Reference Figures 6 - 10 , a flow rate regulating assembly 600 is provided on the docking portion 230 for regulating the flow rate of the molten glass input into the overflow groove 111.

[0074] Specifically, a through docking port 231 is formed on the docking portion 230. The regulating assembly 600 is installed in the docking port 231. One side of the docking port 231 is communicated with the output end of the feeding pipe group 300, and the other end is communicated with the overflow groove 111.

[0075] Next, the regulating assembly 600 will be described in detail:

[0076] The regulating assembly 600 includes a fixed ring plate 610, a rotating ring plate 620, a set of rotating blades 630 and a driving member 640.

[0077] The fixed ring plate 610 is of an annular structure, and its circumferential side is fixed within the docking port 231. A plurality of rotating bases 611 are uniformly arranged along one side of the fixed ring plate 610 in the circumferential direction.

[0078] The rotating ring plate 620 is also of an annular structure, and its outer wall is rotatably connected within the docking port 231. A plurality of movable guide grooves 621 are uniformly arranged along the circumferential direction of the rotating ring plate 620.

[0079] The fixed ring plate 610 and the rotating ring plate 620 are arranged at intervals along the axial direction of the docking port 231, and the fixed ring plate 610 and the rotating ring plate 620 are parallel to each other.

[0080] The rotating blade group 630 is arranged between the fixed ring plate 610 and the rotating ring plate 620, and includes a plurality of rotating blades 631 that are rotationally arranged around the axis of the docking port 231 at a preset angular pitch.

[0081] Specific reference Figure 10 , each rotating blade 631 is similar to a crescent shape, and a notch with an opening facing the center direction of the docking port 231 is formed thereon.

[0082] A feed inlet is formed between the rotating blades 631, and the size of the feed inlet changes as the rotating blades 631 rotate.

[0083] Both sides of the rotating blade 631 are respectively connected to the fixed ring plate 610 and the rotating ring plate 620. Specifically, a first connecting portion 632 is formed at the first end of each rotating blade 631, and a second connecting portion 633 is formed at the second end. The first connecting portion 632 and the second connecting portion 633 are respectively located on both sides of the rotating blade 631. The first connecting portion 632 is located on the side close to the fixed ring plate 610, and the second connecting portion 633 is located on the side close to the rotating ring plate 620.

[0084] The first connecting portion 632 is correspondingly connected to the rotating base 611, and the second connecting portion 633 is correspondingly connected to the movable groove portion.

[0085] The driving member 640 is connected to the outside of the docking portion 230, and its output shaft passes through the docking portion 230 and is connected to the rotating ring plate 620 for driving the rotating ring plate 620 to rotate around the axis of the docking port 231 as the rotation center.

[0086] Reference Figure 7 、 Figure 9 , specifically, the driving member 640 includes a driving motor 641 and a transmission gear 642 connected to the output end of the driving motor 641.

[0087] A toothed section 622 is formed on the outer wall of the rotating ring plate 620. Transmission teeth that cooperate with the transmission gear 642 are provided on the toothed section 622. The transmission gear 642 is cooperatively connected with the toothed section 622 and is used to drive the rotation of the rotating ring plate 620, so as to drive each rotating blade 631 to rotate at an angle with the corresponding rotating base 611 as the center, thereby adjusting the size of the feed port.

[0088] Each movable guide groove 621 extends along the radial direction of the rotating ring plate 620. When the rotating ring plate 620 rotates, the movable groove portion drives the second connecting portion 633 to rotate, and the second connecting portion 633 displaces relative to the movable groove portion. Each rotating blade 631 rotates with the first connecting portion 632 as the rotation center, so that the positions of the rotating blades 631 change, thereby changing the size of the feed port formed between the rotating blades 631.

[0089] A housing body extending towards the rotating ring plate 620 is formed on the fixed ring plate 610, and the rotating ring plate 620 is rotatably connected within the housing body.

[0090] An annular rotating groove is formed on the inner side of the housing body. The rotating ring plate 620 is connected within the rotating groove. A structure for assisting rotation such as a bearing can be provided between the rotating ring plate 620 and the rotating groove to improve the smoothness of rotation.

[0091] In some embodiments of the present application, the rotating base 611 is a rotating groove formed on one side of the fixed ring plate 610, and the first connecting portion 632 is a rotating column extending along the direction away from the rotating blade 631. The first connecting portion 632 is rotatably connected within the rotating base 611.

[0092] Alternatively, it can also be designed such that the rotating base 611 is a rotating column formed on the fixed ring plate 610 and extending towards the rotating blade 631, and the first connecting portion 632 is a rotating groove. The rotating base 611 is rotatably connected within the first connecting portion 632.

[0093] The second connecting portion 633 is a connecting column extending along the direction away from the first connecting portion 632. The second connecting portion 633 is inserted into the movable groove portion and can move along the corresponding movable groove portion.

[0094] The adjusting assembly 600 can adjust the opening size of the feed port to adapt to overflow troughs 111 of different sizes, and the adjustment method is to equally inwardly contract or equally outwardly expand towards the center of the feed port, so that the molten glass input into the overflow trough 111 from the feed port is more uniform, avoiding problems such as uneven thickness of the carrier glass and poor finished product quality caused by uneven input of molten glass in the overflow trough 111.

[0095] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

[0096] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A carrier glass overflow forming device, characterized in that: include: The overflow brick body comprises an upper overflow body and a lower overflow body, wherein the lower overflow body is located below the upper overflow body, an overflow groove is formed in the upper overflow body, and the overflow groove is an upper opening structure; guide walls are formed on both sides of the lower overflow body; a supporting channel is formed in the lower overflow body and penetrates along the length direction of the lower overflow body; A baffle assembly, comprising a first baffle member and a second baffle member respectively formed at two ends of the overflow groove, wherein upper edges of the first baffle member and the second baffle member are higher than the overflow groove; a supporting crossbeam detachably connected within the supporting channel; Two support components are respectively arranged at the two ends of the overflow brick body, each of the support components includes a support base and a support platform arranged on the support base, a support groove is formed on the support platform, and the two ends of the support beam are respectively supported in the corresponding support grooves.

2. The overflow forming device for carrier glass according to claim 1, characterized in that: The cross-sectional size of the support channel gradually decreases from top to bottom, the top surface of the support channel is a plane, and the shape of the support beam is adapted to the support channel.

3. The overflow forming device for carrier glass according to claim 1, characterized in that: The top surface of the support channel is an upwardly convex arc surface, and the shape of the support beam is adapted to the support channel.

4. The overflow forming device for carrier glass according to claim 2 or 3, characterized in that: The cross-sectional dimension of the support groove gradually decreases along the depth direction thereof, and the support beam is at least partially connected in the support groove.

5. The overflow forming device for carrier glass according to claim 1, characterized in that: A limiting support member is also provided on the support base, and the length direction of the limiting support member is perpendicular to the length direction of the supporting beam. A limiting groove is formed on the limiting support member along its length direction, and a limiting recess with a downward opening is formed on the supporting beam. The limiting recess is adapted to the position of the limiting groove, and the limiting recess is connected to the limiting groove through a limiting block.

6. The overflow forming device for carrier glass according to claim 5, characterized in that: The position-limiting support member is also provided with an avoidance portion, and the support beam passes through the avoidance portion and is supported on the support platform.

7. The overflow forming device for carrier glass according to claim 1, characterized in that: The first baffle member is provided with a docking portion, which is used to be connected to a feeding assembly. The docking portion is provided with a flow regulating assembly, which is used to regulate the flow of the molten glass input into the overflow trough.

8. The overflow forming device for carrier glass according to claim 1, characterized in that: A diverter portion is formed on one side of the second baffle member close to the overflow groove, and the diverter portion gradually shrinks in a direction away from the second baffle member.

9. The overflow forming device for carrier glass according to claim 1, characterized in that: The depth of the overflow groove gradually decreases along the direction from the first baffle member to the second baffle member.

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