DE102007000746B9 - Passing device for border roller and method for the production of flat glass - Google Patents

Abstract

Feedthrough device (20) for a drive roller (12) and a wheel (11) having Bortenroller (10) with at least one in the side wall (2) of a Floatbadvorrichtung (1) insertable holding element (22), on the holding element (22) fixed pipe adapter (40) and with a tube on the intermediate piece (40) arranged bellows (28), and with a first bearing (16) for the drive shaft (12), characterized in that between the holding element (22) and the bellows (28) has a second Bearing (18) for the drive shaft (12) is arranged, wherein the second bearing (18) is formed elastically.

Description

The The invention relates to a feedthrough device for one Border roller according to the preamble of Claim 1. The invention also relates to a method for the production of flat glass, in particular of TFT glass.

The production of flat glass by the float process, known as float glass, has been known since the last century and is essentially based on the fundamental intellectual property rights of Pilkington ( US 3,083,551 . DE 147 19 50 A ). In the float process, liquid glass, which is produced by means of a trough from the working trough, is allowed to flow onto a bath of molten metal, generally tin. The flow rate of the glass is controlled by a movable slide, with its setting, among other things, the glass thickness is set. As seen in the flow direction of the glass behind the slide is the pouring lip, from which the glass melt flows continuously to the metal bath, where the glass melt is formed into a dimensionally stable glass ribbon and solidifies. Subsequently, the solidified glass ribbon is removed from the metal bath.

The Float bath is located in a float bath enclosure, which is usually in 7 or 8 Floatbadabschnitte, so-called Bays, is divided.

The Float glasses manufactured in this way, which are usually a Thicknesses of less than 1.5 mm are used as thin glass substrates used among other things for the production of flat screens, z. For example, plasma display panels (PDP), field emission screens (FED = Field Emission Display), TFT Liquid Crystal Displays (TFT = Thin Film Transistor), STN liquid crystal displays (STN = Super Twisted Nematic), plasma-assisted liquid crystal displays (PALC Plasma Assisted Liquid Crystal), electro-luminescence displays (EL) and the like or for the production of thin-film solar cells.

at The flat screens will vary depending on the type of display two glass panes either a thin layer of a liquid crystal compound introduced or it will be on the front and back of the back or front disc each applied dielectric layers, from which cells are formed in which phosphors are housed.

It Here it is important that the layer thickness of the liquid crystal layer or the thickness of the dielectric layer is strictly adhered to, especially with large ones Dimensions of a screen no annoying color distortions or similarity deviations occur. As the layer thicknesses, currently about 30 microns, getting smaller and the screens always grow, This condition is becoming increasingly important.

The surface quality of the float glass is affected by surface defects called top bacons, which are caused by deposits of Sn and SnO ₂ particles on the glass ribbon when using a tin bath. The atmosphere above the float bath contains, despite flooding the interior with forming gas (typical composition 10% H ₂ , 90% N ₂ ) residual amounts of oxygen, which penetrates into the tin bath and forms there SnO ₂ particles. As the bath temperature increases, both tin and tin oxide evaporates and enriches the atmosphere, with the result that the tin and tin oxide particles can precipitate on the glass ribbon.

Further Interference can be caused by go out the so-called Toprollern, the ripples in the glass band can cause.

Top rollers, which are also referred to as Bortenroller, essentially have a resting on the edge of the glass band wheel, which with a Drive shaft is connected by an outer tube through the wall of the Floatbadvorrichtung to the outside guided is where the drive and holding device for the Bortenroller located. Wheel, drive shaft and outer tube are usually cooled. The Bortenroller need movable in both vertical and horizontal directions be arranged to respect the wheel to align the glass ribbon. The feedthrough device must take these requirements into account, with a sufficient seal guaranteed must be on the one hand, that on the inside of the Floatbadvorrichtung Forming gas can not escape to the outside and on the other hand no air and thus oxygen in the interior of the Floatbadvorrichtung can penetrate.

From the US 3,709,673 A a Bortenroller is known, which is mounted on a arranged outside the Floatbadvorrichtung table. The Bortenroller has a drive shaft which is arranged in a stationary tube which extends through the side wall of the Floatbadvorrichtung in the interior. Due to the large distance of the wheel of the Bortenrollers from the bearing on the table, the free end of the Bollenrollers on which the wheel is mounted, swing, which can lead to ripples of the glass ribbon.

The DE-1 596 589 B describes a Bortenroller, which is mounted in a warehouse in the side wall of Floatbadbehälters, said bearing at the same time forms out as a seal against the outside air, so that they can not penetrate into the inert gas atmosphere within the Floatbadgehäuses. This storage has the disadvantage that the position of the Bollenrollers is fixed, so that alignment and adaptation to the glass ribbon is not possible.

The JP 08-277 130 A discloses a Bortenroller with a feedthrough device having a disposed in the side wall of the Floatbadvorrichtung feedthrough tube as a holding element and an outwardly adjoining reducer and a bellows. At the outer end of the bellows, a shaft bearing is arranged. The Bortenroller is sealed and due to the free spaces in the reducer and in the passage tube in the vertical direction movable, in particular pivotable about a horizontal axis in order to bring about the necessary alignment with the glass ribbon can. Even with this feedthrough device vibrations of the Bollenrollers can not be avoided, so that the glass ribbon has ripples.

Starting from the JP 08-277 130 A It is an object of the invention to provide an implementation device for Bortenroller be avoided with the vibrations of the Bollenrollers.

It The object of the invention is also a process for the production of Specify flat glass, which has a lower waviness.

These Task is with an implementing device solved, which is characterized in that between the holding element and the bellows a second bearing for the shaft is arranged, wherein the second bearing is elastic.

The first bearing of the drive shaft is preferably on or in the drive unit.

By the extra second bearing, which is arranged close to the side wall, is the free length of the Bortenrollers significantly reduced, so that vibrations of the Rades of the Bollenrollers and thereby the waviness of the glass ribbon be significantly reduced.

The elasticity the second camp allows a Swiveling the drive shaft both to a vertical, as well around a horizontal axis, leaving the wheel to the position of the glass band can be aligned. The pivot point of the drive shaft is located Accordingly, in the second camp.

Of the Inner diameter of the holding element, which may be a piece of pipe, for example can, is such that sufficient space for pivotal movements of the drive shaft to disposal stands. The connection-side section of the drive shaft is through guided the bellows, because of its elasticity the pivoting movement participates.

The second bearing preferably has at least one elastic bearing element on. This second elastic bearing element is preferably a sealing element, which has the advantage that already in the immediate vicinity of the side wall an additional seal what is the influx exists of air and thus of oxygen in the interior of Floatbadgehäuses effective prevented.

The second bearing element is preferably also designed as a damping element, at least possibly occurring vibrations of the belt roller mitigate, but especially to avoid.

The second bearing element takes over not only the bearing of the shaft, it also allows a limited Swiveling the shaft, a seal and / or damping of Wave.

Preferably the second bearing element is arranged in the pipe spacer. The pipe adapter is preferably firmly connected to the holding element. The second depository is thus arranged stationary, so that the mobility of the drive shaft is determined by the second bearing element.

The mentioned requirements for the second bearing element are according to a particular embodiment fulfilled by means of a ring tube, in which a filling made of an elastic fiber material. This embodiment has the advantage that the annular tube sealingly on both the drive shaft as well as on the inner surface of the pipe spacer applies. The elastic fiber material allows mobility for alignment the drive shaft and the damping the drive shaft, for the case that vibrations of the Bollenrollers should occur.

Preferably the ring tube consists of a silicate fabric. As fiber material is preferably ceramic fiber material, in particular of aluminum silicate fibers, used.

The elastic second bearing element is preferably by means of a sleeve fixed in the axial direction. This ensures that the second Bearing element during operation within the pipe spacer not can not move, especially not when the Bortenroller must be moved in the axial direction to adapt to to make the glass ribbon.

Preferably is on the outside lying end of the bellows arranged at least one sealing device, which advantageously comprises a stuffing box.

The Gland preferably has a winding of strings a silicate material. It is on the one hand a good seal achieved and on the other hand ensures thermal insulation.

Farther the retaining element can be double-walled and a thermal Have insulating material. The cover can also be double-walled accomplished be and have a thermal insulating material to this Way heat losses to avoid and contribute to a stable temperature within the Floatbadgehäuses.

Preferably is between the pipe spacer and the bellows arranged at least one seal. This seal preferably consists of a graphite ring.

A Further improvement of the seal is brought about by the fact that Preferably, the bellows by means of a clamping device against the pipe adapter depressed becomes. The interposed seal is thereby pressed accordingly.

Around the vibration behavior in addition to improve, it is provided that the pipe adapter a Attachment means for attaching to the sidewall of the float bath apparatus having. Overall, this creates a more stable design, the is insensitive to vibrations.

The Process for the production of flat glass is characterized that Bortenroller be used in an additional Bearing vibration damped are stored. It could thereby the waviness of the glass ribbon, where the Bortenroller attack, be lowered significantly, so that the quality of the flat glass increased could be.

The Procedure is especially for the production of TFT glass provided. In addition, the procedure can also for thicker glasses, especially for glasses with a thickness> 5 mm are used.

The Process is particularly suitable for the production of borosilicate glasses, alkali-free glasses, aluminosilicate, Aluminolithiumsilikatgläsern and precursor glasses for glass-ceramic.

Particularly suitable is the method for producing borosilicate glass, z. For fire protection applications, having a composition of (all of the following in terms of weight percent based on oxide):
SiO ₂ 70-85, B ₂ O ₃ 7-13, Na ₂ O + K ₂ O + Li ₂ O 3-8, MgO + CaO + SrO 0-3, Al ₂ O ₃ 2-7,
for the preparation of alkali-free alumino (boro) silicate glass with a composition of
SiO ₂ 50-70, B ₂ O ₃ ≤15, Al ₂ O ₃ 10-25, MgO 0-10, CaO 0-12, SrO 0-12, BaO 0-15, with MgO + CaO + SiO + BaO 8 -26, ZnO 0-10, ZrO ₂ 0-5, TiO ₂ 0-5, SnO ₂ 0-2,
z. B. for the production of display glass, in particular with a composition of
SiO ₂ > 55-65, B ₂ O ₃ 5-11, Al ₂ O ₃ > 14-25, MgO 0-8, CaO 0-8, SrO 0-8, BaO ≤ 10 with MgO + CaO + SrO + BaO 8-21, ZnO 0-5, ZrO ₂ 0-2, TiO ₂ 0-3, SnO ₂ 0-2,
in particular SiO ₂ > 58-65, B ₂ O ₃ > 6-10.5, Al ₂ O ₃ > 14-25, MgO 0- <3, CaO 0-9, BaO> 3-8 with MgO + CaO + BaO 8-18, ZnO 0- <2, As ₂ O ₃ free, Sb ₂ O ₃ -free,
preferably Zn oxide, Ce oxide, Zr oxide, Ti oxide free.

It is also particularly suitable for the production of various green glasses for glass-ceramic, such. B. with
SiO ₂ 55-69, Al ₂ O ₃ 19-25, Li ₂ O 3-5, Na ₂ O 0-1.5, K ₂ O 0-1.5, Σ Na ₂ O + K ₂ O 0.2 -2, MgO 0.1-2.2, CaO 0-15, SrO 0-1.5, BaO 0-2.5, Σ MgO + CaO + SrO + BaO below 6, ZnO 0-1.5, TiO ₂ 1-5, ZrO ₂ 1-2.5, SnO ₂ 0 to less than 1, Σ TiO ₂ + SrO + SnO _{2 2} 2.5-5, P ₂ O ₅ 0-3
or a glass-ceramic precursor glass having a composition of
SiO ₂ 55-75, Al ₂ O ₃ 15-30, Li ₂ O 2.5-6, Σ Na ₂ O + K ₂ O less than 6, Σ MgO + CaO + SrO + BaO less than 6, B ₂ O ₃ 0 to less than 4, ΣTiO ₂ + ZrO ₂ less than 2
or a glass-ceramic precursor glass having a composition of
SiO ₂ 60-72, Al ₂ O ₃ 18-28, Li ₂ O 3-6, Σ Na ₂ O + K ₂ O 0.2-2, Σ MgO + CaO + SrO + BaO less than 6, ZnO 0-1 , 5, B ₂ O ₃ 0 to less than 4, SnO 0.1-1.5, ΣTiO ₂ + ZrO ₂ less than 2, P ₂ O ₅ 0-3, Σ 0-2.

exemplary embodiments The invention will be explained in more detail with reference to the drawings. It demonstrate:

1 FIG. 2 a schematic representation of a vertical section through the edge of a float bath device with the feed device of a border roller, FIG.

2 a detail section in the region of the first and second bearing point by the feedthrough device, wherein the drive shaft relative to the position in 1 has been pivoted,

3 an enlarged perspective exploded view in the region of the second bearing and

4 a vertical section through the through guiding device according to the 1 without border roller.

In the 1 is a schematic representation of the right portion of a Floatbadvorrichtung 1 shown a bottom wall 3 and a side wall 2 having. Inside the float bath device 1 there is a bath of liquid metal 4 , in particular of tin, on which a glass band 5 located at the edge 6 the wheel 11 a border roller 10 attacks. The Bortenroller 10 has a rotatable, cooled drive shaft 12 in a fixed outer tube 13 is guided. In the area of the spinning wheel 11 is at the end of the outer tube 13 a sliding seal 9 arranged.

The drive shaft 12 is outside the float bath device 1 with a drive device 14 connected to the ground 8th stands or as an alternative z. B. may be suspended from the building ceiling. The first camp 16 the drive shaft 12 is in the drive device 14 arranged.

The feedthrough device 20 for the Bortenroller 10 has a retaining element 22 on that in the sidewall 2 is used. In the illustration shown here, the holding element consists 22 from a pipe socket whose inner diameter is significantly larger than the outer diameter of the tube 13 of the border roller 10 ,

To the outside closes to this holding element 22 a cover 24 on, sealingly on the outside of the sidewall 2 is applied. The inner diameter of the cover 24 corresponds to the inner diameter of the holding element 22 , The cover 24 is double-walled and has a thermal insulation material inside 26 on.

At the end panel 24 is a pipe adapter 40 arranged, at the top of a fastening device 80 having, for reducing vibrations, the pipe spacer 40 in addition to the outside of the side wall 2 the float bath device 1 is attached.

In the interior of the pipe adapter 40 is the second camp 18 with the elastic bearing element 44 , This second bearing element 44 will be related to the 3 and 4 described in detail.

The pipe adapter 40 has a flange 41 where the first flange 30 the subsequent bellows 28 is applied. Both flanges 41 and 30 are by means of a clamping device 74 connected.

Between the two flanges 41 . 30 is a graphite ring as a seal 70a arranged, by means of the clamping device 74 is pressed.

At the right end, the bellows 28 a second flange 32 on, on the outside of the flange 55 a sealing device 50 rests, which is a stuffing box 52 includes.

As related to the 4 is explained, there is the stuffing box 52 essentially a winding of silicate strings 54 , in the 1 are indicated only schematically. Between the two flanges 55 and 32 is another gasket in the form of graphiting 70b arranged.

The inner diameter of retaining element 22 , Cover 24 , Pipe adapter 40 and bellows 28 is larger than the outer diameter of the outer tube 13 , leaving enough room for the displacement and / or pivoting of the drive shaft 12 is available.

In the 2 is the area of the bellows 28 and the pipe adapter 40 shown enlarged in section, with the drive shaft 12 with the outer tube 13 opposite the horizontal 92 is pivoted by an angle α. With 94 becomes the longitudinal axis of the outer tube 13 designated. The wheel (not shown) 11 receives thereby an inclination.

The fulcrum 90 is in the second camp 18 , Because of the pipe adapter 40 fixedly mounted, performs a pivoting of the tube 13 to a deformation of the bearing element 44 , As the bearing element 44 is formed elastically, this pivoting is easily possible without the sealing effect of the bearing element 44 will be annulled. Because the stuffing box 52 such a deformation does not allow a Nachobenschwenken the sealing device takes place 50 , which is due to the elastic design of the bellows 28 is possible.

In the 3 FIG. 10 is an enlarged perspective view of the front portion of the grommet. FIG 20 to see. The holding element 22 consists in the embodiment shown of box-shaped inserts, which in the corresponding opening of the side wall 2 the float bath device 1 be used. Opposite the retaining element 22 stands the cover 24 before and seals the opening in the side wall 2 from.

To the end panel 24 closes the pipe adapter 40 on that the flange 41 has, on the fixing pins 72 to project in a horizontal direction to the right. At the first flange 30 the bellows 28 There are corresponding holes in which the pins 72 when joining intervention.

Inside the pipe adapter 40 is the second bearing element 44 that made of a ring tube 46 consists in which a filling 48 is arranged from thermal insulation material in the form of silicate fibers. The second bearing element 44 is thereby given an elastic property, the pivoting of the drive shaft 12 of the border roller 10 allows, as in 2 for example, is shown. The second bearing element 44 lies in a cuff 42 and is on this cuff by means of the ring collars 43a , b fixed in the axial direction.

In the 4 is a section through the entire feedthrough device 20 shown. It can be seen that the cuff 42 on the left side the collar 43a and on the right side the waistband 43b that prevent the second bearing element 44 can dodge in the axial direction.

The holding element 22 is double-walled and contains a thermal insulation material 26 ,

The stuffing box 52 extends into the interior of the bellows 28 , In an annular housing 51 with frontal waistband 53 There is a winding of silicate strings 54 on which from the outside a press ring 57 is inserted. The flange 32 the bellows 28 is with the flange 55 the stuffing box 52 over a graphite ring 70b by means of a clamping device 60 sealed together. By means of another clamping device 56 which, in essence, is on the flange 58 spring-mounted and on the flange 55 fastened screws 59 is the stuffing box 52 pressed and brought about the desired seal.

The clamping device 74 with which the pipe adapter 40 and the bellows 28 connected to each other is also shown. The clamping device 74 has two tension levers 76 on, with which the two flanges 30 . 41 of pipe adapter 40 and bellows 28 pressed against each other. At the top of the pipe adapter 40 is the additional fastening device 80 to be seen on the outside of the sidewall 2 is attached.

1

Floatbadvorrichtung

2

Side wall

3

bottom wall

4

liquid metal bath

5

glass tape

6

edge of the glass band

8th

ground

9

sliding seal

10

Curbing Roller

11

wheel

12

drive shaft

13

outer tube

14

driving means

16

first camp

18

second camp

20

Through device

22

retaining element

24

End cover

26

insulating material

28

bellow

30

first flange

32

second flange

40

Pipe connection

41

flange

42

cuff

43a, b

collar

44

second bearing element

46

ring tube

48

filling

50

seal means

51

bearing housing

52

gland

53

Federation

54

line

55

flange

56

tensioning device

57

press ring

58

flange of the press ring

59

screw

60

tensioning device

70a, b

graphite ring

72

locating pin

74

tensioning device

76

clamping lever

80

fastening device

90

pivot point

92

horizontal

94

Longitudinal axis of the outer tube 13

Claims (19)

Feedthrough device ( 20 ) for a drive shaft ( 12 ) and a wheel ( 11 ) having Bortenroller ( 10 ) with at least one in the side wall ( 2 ) a float bath device ( 1 ) insertable retaining element ( 22 ), one on the holding element ( 22 ) fixed pipe adapter ( 40 ) and with a pipe adapter ( 40 ) arranged bellows ( 28 ), and with a first bearing ( 16 ) for the drive shaft ( 12 ), characterized in that between the holding element ( 22 ) and the bellows ( 28 ) a second warehouse ( 18 ) for the drive shaft ( 12 ), the second bearing ( 18 ) is elastic. Apparatus according to claim 1, characterized ge indicates that the second camp ( 18 ) at least one elastic second bearing element ( 44 ) having. Apparatus according to claim 1 or 2, characterized in that the second bearing element ( 44 ) is an elastic sealing element and / or damping element. Device according to one of claims 2 or 3, characterized in that the second bearing element ( 44 ) in the pipe adapter ( 40 ) is arranged. Device according to one of claims 2 to 4, characterized in that the second bearing element ( 44 ) a ring tube ( 46 ), in which a filling ( 48 ) is made of an elastic fiber material. Apparatus according to claim 5, characterized in that the annular tube ( 48 ) consists of a silicate fabric. Apparatus according to claim 5 or 6, characterized that the elastic fiber material consists of ceramic fiber material. Device according to one of claims 2 to 7, characterized in that the second bearing element ( 44 ) by means of a cuff ( 42 ) is fixed in the axial direction. Device according to one of claims 1 to 8, characterized in that at the outer end of the bellows ( 28 ) at least one sealing device ( 50 ) is arranged. Apparatus according to claim 9, characterized in that the sealing device ( 50 ) a stuffing box ( 52 ). Apparatus according to claim 10, characterized in that the stuffing box ( 52 ) a winding of strings ( 54 ) of a silicate material. Device according to one of claims 1 to 11, characterized in that the holding element ( 22 ) is double-walled and a thermal insulating material ( 26 ) having. Device according to one of claims 1 to 12, characterized in that the retaining element ( 22 ) on the outside of the side wall ( 2 ) adjacent end panel ( 24 ) having. Apparatus according to claim 13, characterized in that the cover ( 24 ) is double-walled and a thermal insulating material ( 26 ) having. Device according to one of claims 1 to 14, characterized in that between the pipe intermediate piece ( 40 ) and the bellows ( 28 ) A seal is arranged. Apparatus according to claim 15, characterized in that the seal is a graphite ring ( 70a , b). Device according to one of claims 1 to 16, characterized in that the bellows ( 28 ) by means of a tensioning device ( 74 ) with the pipe adapter ( 40 ) connected is. Device according to one of claims 1 to 17, characterized in that the pipe intermediate piece ( 40 ) a fastening device ( 80 ) for fixing to the side wall ( 2 ) the Floatbadvorrichtung ( 1 ) having. Process for the production of flat glass, in which a molten glass is poured onto a bath of liquid metal, the molten glass is molded into a glass ribbon and the molded Glass ribbon is lifted from the metal bath, wherein during the molding of the glass ribbon to the leadership the glass ribbon Bortenroller be used, characterized that Bortenroller be used in an additional Bearing vibration damped are stored.