An online glass coating process

Abstract

The present invention relates to the technical field of glass coating, and specifically to an on-line glass coating process. The on-line glass coating process includes the following steps: Step 1: Convey the glass ribbon discharged from the tin bath through the conveying rollers in the housing; Step 2: During the conveying process of the conveying rollers, use the conveying rollers to provide reaction gas to the lower surface of the glass ribbon, and the gas outlet of the conveying rollers does not contact the glass ribbon, so that the reaction gas reacts with the glass ribbon at a high temperature to form a protective film; Step 3: Feed the glass ribbon with the protective film formed into an annealing furnace. In this on-line glass coating process, the conveying rollers are composed of fan-shaped parts and empty parts. Two adjacent fan-shaped parts alternately support the glass, and the gas outlet area is located in the empty part. The fan-shaped parts have no holes and will not affect the protective film.

Description

Technical Field

[0001] The present invention relates to the technical field of glass coating, and specifically to an on-line glass coating process. Background Art

[0002] The glass coating process in the prior art usually adopts the following method: the raw materials for making glass are poured into the melting zone, and the molten glass liquid flows into the tin bath area. Since the density of the tin liquid is greater than that of the glass solution, the glass solution forms a glass ribbon on the tin liquid, enters the annealing furnace through the transition zone for annealing process treatment, and finally the glass ribbon is cut into glass plates of specified sizes, thus completing the production of glass.

[0003] In the patent with the application number CN202311079653.9, a low-emissivity coated glass manufacturing device based on float glass is proposed. The glass ribbon needs to be transported after coming out of the tin bath area, usually through rollers. During the transportation process, sulfur dioxide gas is often introduced into the lower surface of the glass ribbon. At high temperature, the sulfur dioxide gas reacts with the Na ions on the lower surface of the glass to form a thin film buffer protection layer of sodium sulfate or sodium sulfite. This protection layer can greatly inhibit the generation of defects such as micro-scratches on the lower surface of the glass. Specifically during operation, the sulfur dioxide gas is sprayed from the first air holes towards the lower side of the glass and reacts with the lower side of the glass.

[0004] However, the contact area between the air flow ejected from the first air holes of the above structure and the glass is small, resulting in poor coating effect, and the holes on the rollers may also affect the formation of the thin film buffer protection layer on the lower surface of the glass. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides an on-line glass coating process, which solves the problems of small contact area between the air flow and the glass and poor coating effect in the prior art.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: an on-line glass coating process, including the following steps:

[0007] Step 1: Transport the glass ribbon discharged from the tin bath through the conveyor rollers in the housing;

[0008] Step 2: Provide reaction gas to the lower surface of the glass ribbon by using the conveyor rollers during the transportation process of the conveyor rollers. The air outlet of the conveyor rollers does not contact the glass ribbon, so that the reaction gas reacts with the glass ribbon at high temperature to form a protection film;

[0009] Step 3: Send the glass ribbon with the protection film formed into the annealing furnace.

[0010] Further, in Step 2, the position of each conveyor roller can provide reaction gas to the lower surface of the glass ribbon, and the adjacent two conveyor rollers alternate in discharging gas.

[0011] Further, the conveying rollers are arranged side by side inside the housing;

[0012] The conveying roller includes a central shaft portion and a sector portion provided on the central shaft portion. An empty portion is formed in the area where the sector portion is not provided, and the central angle of the sector portion is more than 180°; the arrangement directions of the sector portions of two adjacent conveying rollers are opposite;

[0013] A cavity for providing reaction gas is formed inside the central shaft portion, and a second air hole is formed at a position corresponding to the empty portion of the central shaft portion for discharging the reaction gas.

[0014] Further, a second hollow shaft is provided at the axis center of the conveying roller, and the second hollow shaft can introduce gas into the cavity;

[0015] A valve is installed on one side of the second hollow shaft close to the glass belt. When the valve is located at the empty portion, it is in an open state so that the reaction gas can enter the cavity from inside the second hollow shaft. When the valve is not at the empty portion, it is in a closed state so that the inside of the second hollow shaft is separated from the cavity.

[0016] Further, the inner wall of the cavity corresponding to the empty portion is a first arc-shaped wall, the inner wall of the cavity corresponding to the sector portion is a second arc-shaped wall, and the radius of the first arc-shaped wall is smaller than that of the second arc-shaped wall;

[0017] The valve is of an elastic structure. When the valve passes through the first arc-shaped wall, it is compressed to form an open state of the valve. When the valve passes through the second arc-shaped wall, the valve rebounds to form a closed state of the valve.

[0018] Further, the valve includes:

[0019] A hollow cylinder, which is fixed on the surface of the second hollow shaft, and the inside of the hollow cylinder is communicated with the inside of the second hollow shaft;

[0020] A movable column, which is arranged inside the hollow cylinder. The upper end of the movable column extends to the outside of the hollow cylinder, and the movable column can move along the axial direction of the hollow cylinder. The top end of the movable column is always in contact with the inner wall of the cavity;

[0021] A sealing ring, which is arranged inside the hollow cylinder and is fixed on the outer peripheral surface of the movable column;

[0022] An upper spacer ring and a lower spacer ring, both of which are fixed on the inner wall of the hollow cylinder. The upper spacer ring is located on the side of the sealing ring away from the second hollow shaft, and the lower spacer ring is located on the side of the sealing ring close to the second hollow shaft. A second spring is arranged between the lower spacer ring and the sealing ring, and the second spring applies an upward force to the sealing ring so that the sealing ring contacts the upper spacer ring.

[0023] Further, both ends of the conveying roller are fixedly provided with first hollow shafts, the second hollow shaft passes through the first hollow shaft, and the first hollow shaft is installed on a bearing seat.

[0024] Further, a spoiler blade is provided at one of the intersections between the fan-shaped part and the empty part, and a transmission assembly for driving the spoiler blade to flap is provided on the bearing seat.

[0025] Further, the transmission assembly includes:

[0026] A transmission gear. Connecting parts are provided on both ends of the spoiler blade near the center of the fan-shaped part. A blade shaft is fixedly provided on the side of the connecting part near the center of the fan-shaped part. A thickening part is fixedly provided between the first hollow shaft and the conveying roller. One end of the blade shaft close to the conveying roller is rotatably installed on a side seat on the side of the thickening part through a bearing, and the transmission gear is installed at the end of the blade shaft away from the conveying roller;

[0027] An outer fixed cylinder, the outer fixed cylinder is installed on the bearing seat, and the outer fixed cylinder is located on the side of the transmission gear away from the center of the fan-shaped part. Equally spaced outer racks that can mesh with the transmission gear are fixedly provided on the inner surface of the outer fixed cylinder near the glass belt feeding side;

[0028] An inner fixed cylinder, the inner fixed cylinder is installed on the bearing seat, and the inner fixed cylinder is located on the side of the transmission gear close to the center of the fan-shaped part. Equally spaced inner racks that can mesh with the transmission gear are fixedly provided on the outer surface of the inner fixed cylinder near the glass belt feeding side;

[0029] The outer rack and the inner rack are arranged in an alternating manner.

[0030] Further, an air inlet pipe is further included, and the air inlet pipe is fixedly connected and communicated with the second hollow shaft.

[0031] The present invention has the following beneficial effects:

[0032] (1) In this online glass coating process, the conveying roller is composed of a fan-shaped part and an empty part. Two adjacent fan-shaped parts alternately support the glass, and the gas outlet area is located in the empty part. The fan-shaped part has no holes and will not affect the protective film.

[0033] (2) In this online glass coating process, by providing a valve on the second hollow shaft, when the valve is located in the empty part, it is in an open state so that the reaction gas can enter the cavity from the inside of the second hollow shaft. When the valve is not in the empty part, it is in a closed state so that the inside of the second hollow shaft is separated from the cavity, avoiding the second air outlet hole still jetting gas outward when the empty part rotates to face the bottom end of the housing, and further concentrating the reaction gas in the upper side area of the conveying roller to increase the gas concentration in the upper side area.

[0034] (3) In this online glass coating process, by setting spoiler vanes, on the one hand, the spoiler vanes can block part of the gas from discharging obliquely, and on the other hand, they can disturb the air flow upward, enabling the air flow to reach the lower surface of the glass belt. They can also diffuse the gas to expand the gas flow area.

[0035] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is the process flow chart of the present invention;

[0037] Figure 2 is the external view of the housing of the present invention;

[0038] Figure 3 is the layout diagram of the conveyor rollers of the present invention;

[0039] Figure 4 is the schematic internal structure diagram of the conveyor roller of the present invention;

[0040] Figure 5 is the cross-sectional view of the conveyor roller of the present invention;

[0041] Figure 6 is the state change diagram of the conveyor roller of the present invention, where: (a) the state is that part of the empty part is vertically upward and part of the empty part is vertically downward; (b) the state is the state after each conveyor roller rotates clockwise in the state of (a) (the rotation angle is between 90° and 180°); (c) the state is the state after each conveyor roller rotates clockwise in the state of (b);

[0042] Figure 7 is the schematic structure diagram of using a circular roller in the prior art;

[0043] Figure 8 is the assembly diagram of the conveyor roller and the bearing seat of the present invention;

[0044] Figure 9 is the schematic structure diagram of the second hollow shaft of the present invention;

[0045] Figure 10 is the schematic structure diagram of the second hollow shaft and the valve of the present invention;

[0046] Figure 11 For the present invention Figure 8 enlarged view of area A;

[0047] Figure 12 is the relative position diagram of the outer fixed cylinder, the transmission gear, and the inner fixed cylinder of the present invention;

[0048] Figure 13 is the cross-sectional view of the outer fixed cylinder, the transmission gear, and the inner fixed cylinder of the present invention.

[0049] In the figure, 1 is a housing; 2 is a glass ribbon; 3 is a circular roller; 4 is a support table; 5 is a first hollow shaft; 51 is a thickened part; 52 is a side seat; 6 is an intake pipe; 7 is a second hollow shaft; 8 is a bearing seat; 9 is an inner fixing cylinder; 91 is an inner rack; 10 is a spoiler vane; 101 is a connecting part; 102 is a vane shaft; 11 is an outer fixing cylinder; 111 is an outer rack; 12 is a transmission gear; 13 is a conveying roller; 135 is an empty part; 136 is a fan-shaped part; 137 is a central shaft part; 1371 is a second air vent; 138 is a cavity; 1381 is a first arc-shaped wall; 1382 is a second arc-shaped wall; 14 is a valve; 141 is a hollow cylinder; 142 is a movable column; 143 is a sealing ring; 144 is an upper spacer ring; 145 is a lower spacer ring; 146 is a second spring; 147 is a third air vent. Detailed implementation mode

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0051] In the description of the present invention, it should be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0052] The following is based on Figures 1 - 13 Describe the glass in-line coating process provided by the embodiments of the present invention.

[0053] Please refer to Figures 1 - 3 , the embodiments of the present invention provide a glass in-line coating process, including the following steps:

[0054] Step 1: Convey the glass ribbon 2 discharged from the tin bath in the housing 1 through the conveying roller 13.

[0055] Step 2: Provide reaction gas to the lower surface of the glass ribbon 2 using the conveying roller 13 during the conveyance of the conveying roller 13, and the air outlet of the conveying roller 13 does not contact the glass ribbon 2, so that the reaction gas reacts with the glass ribbon 2 at a high temperature to form a protective film.

[0056] Step 3: Feed the glass ribbon 2 with the formed protective film into the annealing furnace.

[0057] Therefore, the on-line glass coating process provided by the embodiments of the present invention can directly supply reaction gas to the lower surface of the glass by using the conveying roller 13, thereby expanding the contact area between the gas and the glass and improving the reaction efficiency.

[0058] Preferably, the above reaction gas is a mixed gas of SO2 and N2. SO2 reacts with the Na ions on the surface of the glass belt 2 under high temperature conditions to form a Na2SO4 film, thereby playing a buffering and protective role on the lower surface of the glass belt 2.

[0059] Specifically, as shown in Figure 2 and Figure 3 , the above conveying rollers 13 are arranged side by side in the housing 1. A second hollow shaft 7 is arranged inside the conveying roller 13. First hollow shafts 5 are fixedly arranged at both ends of the conveying roller 13. The second hollow shaft 7 passes through the first hollow shaft 5. The first hollow shaft 5 is installed on the bearing seat 8. The bearing seat 8 is installed on the support table 4, and the housing 1 is also installed between the two support tables 4; a pulley is installed on the first hollow shaft 5. Adjacent pulleys are driven by a belt, and one of the pulleys can be rotated by a motor.

[0060] Preferably, in the above step two, the position of each conveying roller 13 can supply reaction gas to the lower surface of the glass belt 2, and adjacent two conveying rollers 13 supply gas alternately.

[0061] As shown in Figures 3 - 5 , the conveying roller 13 includes a central shaft portion 137 and a fan-shaped portion 136 arranged on the central shaft portion 137. The area without the fan-shaped portion 136 forms an empty portion 135, and the central angle of the fan-shaped portion 136 is more than 180°; the arrangement directions of the fan-shaped portions 136 of adjacent two conveying rollers 13 are opposite.

[0062] In this embodiment, the fan-shaped portion 136 plays a supporting role on the glass belt 2. At the same time, when the fan-shaped portion 136 rotates, it can also promote the flow of gas in the housing 1. The reaction gas can overflow outward at the empty portion 135. The arrangement directions of adjacent conveying rollers 13 have an angle difference of 180°. For example, when the empty portion 135 on one conveying roller 13 is vertically upward, the empty portions 135 on the adjacent two conveying rollers 13 are vertically downward. It can be better understood with reference to the state (a) in Figure 6 , so that the glass belt 2 can always be supported by the conveying roller 13 when passing through the housing 1.

[0063] It should be noted that if the prior art structure described in the background art is selected, holes are opened on the circular roller 3 for jetting gas, as shown in Figure 7 , the holes may have an impact on the protective film such as indentation; as shown in Figure 6 , the present application can avoid the direct contact between the jet holes and the protective film and avoid affecting the protective film.

[0064] Furthermore, a cavity 138 is opened in the middle axis portion 137, and a second air supply hole 1371 is opened at a position of the middle axis portion 137 corresponding to the hollow portion 135. Reaction gas can flow into the cavity 138 and be ejected through the second air supply hole 1371, so that the reaction gas enters the shell 1 from the cavity 138.

[0065] Reference Figures 8 - 10 As shown, in order to achieve the purpose of delivering the above-mentioned reaction gas into the cavity 138, a second hollow shaft 7 is provided at the axis center of the conveying roller 13, and one end of the plurality of second hollow shafts 7 extends out of the conveying roller 13 and is connected to an air inlet pipe 6, and the required reaction gas enters through the air inlet pipe 6, and the reaction gas can enter the cavity 138 through the second hollow shaft 7, and the air inlet pipe 6 and the second hollow shaft 7 are both supported by the support platform 4.

[0066] In addition, a valve 14 is installed on the side of the second hollow shaft 7 close to the glass ribbon 2. The valve 14 is in an open state when it is located in the empty portion 135 to allow the reaction gas to enter the cavity 138 from the second hollow shaft 7. The valve 14 is in a closed state when it is not in the empty portion 135 to isolate the interior of the second hollow shaft 7 from the cavity 138.

[0067] Specifically, a plurality of valves 14 are provided, and the plurality of valves 14 are arranged along the axial direction of the second hollow shaft 7. The gas outlet direction of the valve 14 is always vertically upward. When the conveying roller 13 rotates, different areas thereon will pass through the valve 14 in sequence. When the valve 14 is located in the empty portion 135, that is, when the empty portion 135 rotates to an upward position, the valve 14 is in an open state, so that the reaction gas can enter the cavity 138 from the second hollow shaft 7. When the valve 14 is not in the empty portion 135, that is, when the empty portion 135 rotates to a downward position, the valve 14 is in a closed state, so that the interior of the second hollow shaft 7 is separated from the cavity 138, thereby preventing the second air supply hole 1371 from still ejecting gas outward when the empty portion 135 rotates to face the bottom end of the shell 1, thereby concentrating the reaction gas to the upper area of the conveying roller 13 to increase the concentration of the gas in the upper area.

[0068] When implementing it, Figure 5 , Figure 9 and Figure 10 As shown, the inner wall of the cavity 138 corresponding to the empty portion 135 is a first arc-shaped wall 1381, the inner wall of the cavity 138 corresponding to the fan-shaped portion 136 is a second arc-shaped wall 1382, and the radius of the first arc-shaped wall 1381 is smaller than the second arc-shaped wall 1382, and the valve 14 is an elastic structure. When the valve 14 passes through the first arc-shaped wall 1381, it is compressed to form an open state of the valve 14. When the valve 14 passes through the second arc-shaped wall 1382, the valve 14 rebounds to form a closed state of the valve 14.

[0069] The above valve 14 includes a hollow cylinder 141, the hollow cylinder 141 is fixed on the surface of the second hollow shaft 7, and the inside of the hollow cylinder 141 is communicated with the inside of the second hollow shaft 7. A third air supply hole 147 is opened at the top end of the hollow cylinder 141. An active column 142 is arranged inside the hollow cylinder 141. The upper end of the active column 142 extends to the outside of the hollow cylinder 141, and the active column 142 can move along the axial direction of the hollow cylinder 141. The top end of the active column 142 is always in contact with the inner wall of the cavity 138. When the transfer roller 13 rotates, the first arc wall 1381 and the second arc wall 1382 cooperate with the top end of the active column 142 in turn, so as to drive the active column 142 to generate displacement along its own axial direction.

[0070] Moreover, a sealing ring 143 is arranged inside the hollow cylinder 141, and the sealing ring 143 is fixed on the outer peripheral surface of the active column 142. An upper partition ring 144 and a lower partition ring 145 are also fixed on the inner wall of the hollow cylinder 141. The upper partition ring 144 is located on the side of the sealing ring 143 away from the second hollow shaft 7, and the lower partition ring 145 is located on the side of the sealing ring 143 close to the second hollow shaft 7. The reaction gas in the second hollow shaft 7 can pass through the lower partition ring 145 and the upper partition ring 144, and finally be discharged from the third air supply hole 147. A second spring 146 is arranged between the lower partition ring 145 and the sealing ring 143. The second spring 146 applies an upward force to the sealing ring 143 to make the sealing ring 143 contact with the upper partition ring 144.

[0071] When the top end of the active column 142 contacts the first arc wall 1381, the active column 142 moves downward to compress the second spring 146, so that the sealing ring 143 is separated from the upper partition ring 144, and the gas in the second hollow shaft 7 can be discharged through the valve 14. When the second arc wall 1382 moves to the position of the active column 142, the second spring 146 pushes the active column 142 to move upward, so that the sealing ring 143 contacts the upper partition ring 144, and the valve 14 is closed.

[0072] In addition, referring to Figure 8 、 Figures 11 - 13 As shown, a spoiler vane 10 is arranged at the junction of one of the fan-shaped part 136 and the empty part 135. A transmission component for driving the spoiler vane 10 to flap is arranged on the bearing seat 8. Preferably, the spoiler vane 10 is arranged on the side opposite to the rotation direction of the fan-shaped part 136. Referring to Figure 6 it can be better understood that in the state (a) in Figure 6 , the spoiler vanes 10 on the second and fourth transfer rollers 13 from the left are located at the left junction. The reason why the spoiler vanes 10 are arranged like this is as follows:

[0073] For example, in Figure 6In the shown state, all the conveying rollers 13 rotate in the clockwise direction, and the moving direction of the glass belt 2 is to the right. When the empty part 135 of the conveying roller 13 faces the left side, the air valve 14 starts to open, as shown in Figure 6 In the (b) state of the leftmost conveying roller 13 in , its empty part 135 faces the left side at this moment, and the air valve 14 starts to exhaust. The empty part 135 of the second conveying roller 13 from the left faces the right side, and its air valve 14 starts to close the air. When the leftmost conveying roller 13 starts to exhaust, part of its gas is discharged to the lower left corner. At this time, the spoiler blade 10 can, on the one hand, block part of the gas from being discharged to the lower left corner, and on the other hand, can disturb the air flow upward so that the air flow reaches the lower surface of the glass belt 2. Assuming that the spoiler blade 10 is arranged on the other side of the empty part 135, this effect cannot be achieved.

[0074] Continue to refer to Figure 8 , Figures 11 - 13 As shown, the above-mentioned transmission assembly includes a transmission gear 12, an outer fixed cylinder 11, and an inner fixed cylinder 9.

[0075] Specifically, on one side of both ends of the spoiler blade 10 close to the center of the sector part 136, there is a connecting part 101. On the side of the connecting part 101 close to the center of the sector part 136, there is a blade shaft 102 fixedly installed. Between the first hollow shaft 5 and the conveying roller 13, there is a thickening part 51 fixedly installed. One end of the blade shaft 102 close to the conveying roller 13 is rotatably installed on the side seat 52 on the side of the thickening part 51 through a bearing. Preferably, the side seat 52 and the thickening part 51 are of an integral structure. The transmission gear 12 is installed at the end of the blade shaft 102 away from the conveying roller 13. The outer fixed cylinder 11 is fixedly installed on the bearing seat 8, and the outer fixed cylinder 11 is located on the side of the transmission gear 12 away from the center of the sector part 136. On the inner surface of the outer fixed cylinder 11, on the side close to the feeding side of the glass belt 2, there are equally spaced outer racks 111 that can mesh with the transmission gear 12, that is, the outer fixed cylinder 11 is located outside the revolution path of the transmission gear 12. When the transmission gear 12 passes through the outer rack 111, in Figure 13 the shown state, the transmission gear 12 and the blade shaft 102 rotate counterclockwise around the center of the blade shaft 102; the inner fixed cylinder 9 is fixedly installed on the bearing seat 8, and the inner fixed cylinder 9 is located on the side of the transmission gear 12 close to the center of the sector part 136, that is, the inner fixed cylinder 9 is located inside the revolution path of the transmission gear 12. On the outer surface of the inner fixed cylinder 9, on the side close to the feeding side of the glass belt 2, there are equally spaced inner racks 91 that can mesh with the transmission gear 12. When the transmission gear 12 passes through the inner rack 91, in Figure 13 the shown state, the transmission gear 12 and the blade shaft 102 rotate clockwise around the center of the blade shaft 102.

[0076] Preferably, the outer racks 111 and the inner racks 91 are arranged alternately, so as to achieve the purpose of driving the spoiler blade 10 to swing left and right by the transmission gear 12.

[0077] In this embodiment, as the first hollow shaft 5 rotates, the conveying roller 13 starts to rotate, and at the same time drives the transmission gear 12 to revolve around the center of the conveying roller 13. When the transmission gear 12 reaches the position of the external rack 111 or the internal rack 91, as the transmission gear 12 passes by the external rack 111 and the internal rack 91 in sequence, it can drive the spoiler blade 10 to swing, realizing the left-right reciprocating swing of the spoiler blade 10, thereby realizing the spoiler effect on the air flow and expanding the air flow area.

[0078] During use (operation), when the first hollow shaft 5 rotates, it drives the conveying roller 13 to rotate. The fan-shaped portion 136 of the conveying roller 13 supports the glass belt 2 and drives the glass belt 2 to move in the housing 1. A reaction gas is introduced into the second hollow shaft 7. When the empty portion 135 rotates to the downward position, the valve 14 is in the closed state. When the empty portion 135 rotates to the upward position, the valve 14 is in the open state, and the reaction gas can enter the cavity 138 from the second hollow shaft 7 and be ejected into the housing 1 through the second air supply hole 1371.

[0079] At the same time, as the first hollow shaft 5 rotates, it drives the transmission gear 12 to revolve around the center of the conveying roller 13. When the transmission gear 12 passes by the external rack 111 and the internal rack 91 in sequence, it can drive the spoiler blade 10 to swing, realizing the left-right reciprocating swing of the spoiler blade 10, thereby realizing the spoiler effect on the air flow and expanding the air flow area.

Claims

1. An on-line coating process for glass, characterized in that, It includes the following steps: Step 1: Convey the glass ribbon (2) discharged from the tin bath through the conveying rollers (13) inside the housing (1); Step 2: During the conveyance by the conveying rollers (13), use the conveying rollers (13) to supply reaction gas to the lower surface of the glass ribbon (2). The gas outlet of the conveying roller (13) does not contact the glass ribbon (2), so that the reaction gas reacts with the glass ribbon (2) at a high temperature to form a protective film; Step 3: Feed the glass ribbon (2) with the formed protective film into the annealing furnace; In Step 2, the position of each conveying roller (13) can supply reaction gas to the lower surface of the glass ribbon (2), and the adjacent two conveying rollers (13) discharge gas alternately; The conveying rollers (13) are arranged side by side inside the housing (1); The conveying roller (13) includes a central shaft portion (137) and a sector portion (136) provided on the central shaft portion (137). The area without the sector portion (136) forms a hollow portion (135), and the central angle of the sector portion (136) is more than 180°; the arrangement directions of the sector portions (136) of the adjacent two conveying rollers (13) are opposite; A cavity (138) for supplying reaction gas is provided inside the central shaft portion (137), and a second air supply hole (1371) is provided at a position of the central shaft portion (137) corresponding to the hollow portion (135) for discharging the reaction gas.

2. The online glass coating process according to claim 1, wherein: A second hollow shaft (7) is provided at the axis center of the conveying roller (13), and the second hollow shaft (7) can introduce gas into the cavity (138); A valve (14) is installed on one side of the second hollow shaft (7) close to the glass ribbon (2). The valve (14) is in an open state when it is located in the hollow portion (135), and the valve (14) is in a closed state when it is not in the hollow portion (135).

3. The online coating process for glass according to claim 2, characterized in that: The inner wall of the cavity (138) corresponding to the hollow portion (135) is a first arc wall (1381), and the inner wall of the cavity (138) corresponding to the sector portion (136) is a second arc wall (1382), and the radius of the first arc wall (1381) is smaller than that of the second arc wall (1382); The valve (14) is of an elastic structure. When the valve (14) passes through the first arc wall (1381), it is compressed to form an open state of the valve (14). When the valve (14) passes through the second arc wall (1382), the valve (14) rebounds to form a closed state of the valve (14).

4. A glass on-line coating process according to claim 3, characterized in that: The valve (14) includes: A hollow cylinder (141), the hollow cylinder (141) is fixed on the surface of the second hollow shaft (7), and the inside of the hollow cylinder (141) is communicated with the inside of the second hollow shaft (7); A movable column (142), the movable column (142) is arranged inside the hollow cylinder (141), the upper end of the movable column (142) extends to the outside of the hollow cylinder (141), and the movable column (142) can move along the axial direction of the hollow cylinder (141), and the top end of the movable column (142) is always in contact with the inner wall of the cavity (138); A sealing ring (143) is provided inside the hollow cylinder (141), and the sealing ring (143) is fixed on the outer peripheral surface of the movable column (142). An upper spacer ring (144) and a lower spacer ring (145) are both fixed on the inner wall of the hollow cylinder (141). The upper spacer ring (144) is located on the side of the sealing ring (143) away from the second hollow shaft (7), and the lower spacer ring (145) is located on the side of the sealing ring (143) close to the second hollow shaft (7). A second spring (146) is provided between the lower spacer ring (145) and the sealing ring (143), and the second spring (146) applies an upward force to the sealing ring (143) to make the sealing ring (143) contact the upper spacer ring (144).

5. A glass online coating process according to any one of claims 2-4, characterized in that: Both ends of the conveying roller (13) are fixed with a first hollow shaft (5). The second hollow shaft (7) passes through the first hollow shaft (5), and the first hollow shaft (5) is installed on the bearing seat (8).

6. The online glass coating process according to claim 5, characterized in that: A spoiler vane (10) is provided at one of the intersections of the fan-shaped part (136) and the empty part (135), and a transmission assembly for driving the spoiler vane (10) to flap is provided on the bearing seat (8).

7. A glass online coating process according to claim 6, characterized in that: The transmission assembly includes: A transmission gear (12). Connecting parts (101) are provided on both ends of the spoiler vane (10) close to the center of the fan-shaped part (136). A blade shaft (102) is fixed on the side of the connecting part (101) close to the center of the fan-shaped part (136). A thickening part (51) is fixed between the first hollow shaft (5) and the conveying roller (13). One end of the blade shaft (102) close to the conveying roller (13) is rotatably installed on a side seat (52) on the side of the thickening part (51) through a bearing, and the transmission gear (12) is installed at the end of the blade shaft (102) away from the conveying roller (13). An outer fixed cylinder (11) is installed on the bearing seat (8), and the outer fixed cylinder (11) is located on the side of the transmission gear (12) away from the center of the fan-shaped part (136). Outer racks (111) capable of meshing with the transmission gear (12) are equidistantly fixed on the inner surface of the outer fixed cylinder (11) on the side close to the feeding side of the glass belt (2). An inner fixed cylinder (9) is installed on the bearing seat (8), and the inner fixed cylinder (9) is located on the side of the transmission gear (12) close to the center of the fan-shaped part (136). Inner racks (91) capable of meshing with the transmission gear (12) are equidistantly fixed on the outer surface of the inner fixed cylinder (9) on the side close to the feeding side of the glass belt (2). The outer racks (111) and the inner racks (91) are arranged in a staggered manner.

8. A glass on-line coating process according to claim 7, characterized in that: An air inlet pipe (6) is further included, and the air inlet pipe (6) is fixedly connected to the second hollow shaft (7).

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