CN117800621A - Curved surface vacuum glass powder sealing device assisted by laser - Google Patents
Curved surface vacuum glass powder sealing device assisted by laser Download PDFInfo
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- CN117800621A CN117800621A CN202410223681.1A CN202410223681A CN117800621A CN 117800621 A CN117800621 A CN 117800621A CN 202410223681 A CN202410223681 A CN 202410223681A CN 117800621 A CN117800621 A CN 117800621A
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Landscapes
- Joining Of Glass To Other Materials (AREA)
Abstract
A curved surface vacuum glass powder sealing device adopting laser assistance comprises: the first curved glass substrate and the second curved glass substrate are sealed by heating the glass powder sealing material paste through the area of the laser head irradiation sealing material layer; the sealing device also comprises a plurality of pressing assemblies and a sealing base, wherein the pressing assemblies are slidably arranged at the edge of the sealing base, and the pressing assemblies form a circle around the sealing base; the compressing assembly comprises a compressing head, a reset spring, a guide rod and a compressing support, wherein the compressing head comprises an inserting part, a compressing part and a guide part, and when the compressing head slides to a position close to the curved glass, the inserting part is tightly attached to the edge of the sealing material layer. The invention can form complete and uniform seal and reduce the flow of glass powder at different positions on curved glass caused by gravity under the action of the curved position when the glass powder is melted.
Description
Technical Field
The invention relates to laser welding equipment, in particular to a curved surface vacuum glass powder sealing device assisted by laser.
Background
The curved vacuum glass is formed by stacking and splicing two pieces of curved glass, a low-temperature glass powder paste is arranged between the two layers of glass, and the two pieces of glass are sealed by heating and melting glass powder. In practical application, the melting of the low-temperature glass powder is realized by adopting two modes of integral heating or local heating. Wherein the integral heating causes the glass powder to be synchronously and integrally melted and coagulated, and the generated unbalanced stress is small. However, the whole heating cannot be applied to splicing of toughened curved glass, so that a local heating mode is generated, the glass powder paste is irradiated and melted by a laser head according to the advancing of a sealing route, the whole heating mode cannot heat the glass, the toughening performance of the glass is not affected, and only the sealing position is heated. But the laser head is adopted for carrying out local heating, and unbalanced stress can be generated due to sequential melting and solidification in the direction of the glass powder sealing route. For curved glass, glass powder at different positions flows due to gravity at the curved surface position when melting, and unbalanced stress is more aggravated during solidification due to different flow directions at different positions on the curved surface.
Therefore, it is necessary to design a device for sealing curved surface vacuum glass powder by laser to reduce unbalanced stress during laser sealing of curved surface glass.
Disclosure of Invention
The invention aims to provide a curved surface vacuum glass powder sealing device assisted by laser so as to solve the technical problems in the prior art.
The invention adopts the following technical scheme to realize the aim:
a curved surface vacuum glass powder sealing device adopting laser assistance comprises:
the device comprises a first curved glass substrate and a second curved glass substrate, wherein the first curved glass substrate is provided with an upper surface, and the upper surface is provided with a positioning element arranged on the upper surface;
a sealing material layer including a sealing glass frit paste having a glass frit sealing material as a main component and a laser absorber, and forming a rectangular region along the entire peripheral portions of the first and second curved glass substrates;
a laser head irradiating an area of the sealing material layer to heat the glass frit sealing material paste;
the method is characterized in that: the glass substrate with the first curved surface is fixedly arranged on the sealing base, the pressing assemblies are slidably arranged at the edge of the sealing base, and the pressing assemblies form a circle around the sealing base; the compressing assembly comprises a compressing head, a reset spring, a guide rod and a compressing support, wherein the compressing head comprises an inserting part, a compressing part and a guide part, and when the compressing head slides to a position close to the curved glass, the inserting part is tightly attached to the edge of the sealing material layer.
Preferably, the first curved glass substrate has a first side edge at an edge immediately adjacent to the upper surface thereof; the edge of the second curved glass substrate close to the lower surface of the second curved glass substrate is provided with a second side edge; the sealing material layer has a material edge adjacent the first side edge and the second side edge; the material edge is located between the upper and lower surfaces and has a set nominal distance from adjacent first and second side edges.
Preferably, the pressing head is arranged close to the first side edge and the second side edge, a guide rod is arranged below the pressing head, a guide hole matched with the guide rod is arranged on the sealing base, and the axial direction of the guide hole is perpendicular to the surface normal of the curved glass at the section position.
Preferably, the insertion part and the pressing part of the pressing head are of an integrated structure, the insertion part is arranged on one side, close to the first side edge and the second side edge, of the pressing part and protrudes towards the side, the insertion part is of a rectangular cross-section structure, the thickness of the insertion part is equal to the distance between the upper surface of the first curved glass substrate and the lower surface of the second curved glass substrate, and the length, protruding out of the pressing part, of the insertion part is equal to the rated distance between the material edge and the first side edge and the second side edge.
Preferably, the side of the insertion portion adjacent to the sealing material layer has an insertion abutment side matching the material edge, the insertion portion being connected to the pressing portion by upper and lower transition sides, the upper and lower transition sides being shaped to match the first and second side edges; when the compaction head slides to a position close to the curved glass, the insertion abutting side is tightly attached to the edge of the material, and the upper and lower transition sides are tightly attached to the first side edge and the second side edge; when the pressing head slides to a position far away from the curved glass, the insertion abutting side is separated from the material edge, and the upper and lower transition sides are separated from the first side edge and the second side edge.
Preferably, a guide part perpendicular to the insertion direction is arranged on the outer side of the pressing part, and one end of the guide rod penetrates into the guide hole and the other end of the guide rod is fixedly connected to the guide part.
Preferably, a pressing support is arranged at the edge of the sealing base, the pressing support is of an L-shaped support structure and is provided with a vertical part and a horizontal part, the vertical part is parallel to the edge of the sealing base, and the guide part is arranged between the vertical part of the pressing support and the edge of the sealing base; the free end of the horizontal part of the compression support is fixedly connected to the edge of the sealing base; the reset spring is sleeved on the guide rod, one end of the reset spring is connected to the edge of the sealing base, and the other end of the reset spring is connected to the guide part.
Preferably, a pressing wheel which moves synchronously with the laser head is arranged on the laser head, the pressing wheel is arranged on the laser head through a connecting bracket and is provided with a wheel shaft, the wheel shaft is fixedly arranged on the connecting bracket, and the direction of the wheel shaft is parallel to the axis direction of the laser head 7.
Preferably, the pinch rollers include a front pinch roller, a middle pinch roller, and a rear pinch roller.
Preferably, the pinch roller is located on one side of the laser head and is immediately adjacent to the laser head, the front pinch roller is located in front of the pinch roller, and the rear pinch roller is located behind the pinch roller.
The beneficial effects of the invention are as follows:
1. according to the invention, the plurality of slidable compacting components are arranged along the periphery of the curved glass, so that the material edges of the sealing material layers around the curved glass can be completely blocked and limited by the insertion abutting side of the compacting head, and the molten glass powder sealing material is limited at a rated position, thereby forming complete and uniform sealing, and reducing the flow of glass powder at different positions on the curved glass due to gravity at the curved position when the glass powder is melted;
2. the pressing wheel which moves synchronously with the laser head is arranged on the laser head, and comprises the front pressing wheel, the middle pressing wheel and the rear pressing wheel, so that the pressing heads at the front, middle and rear positions of the laser head can be synchronously pressed, the glass powder sealing material can be in a long-time molten state, and the glass powder sealing material can be kept in a rated position without flowing beyond a range.
Drawings
FIG. 1 is a schematic structural view of a sealing device of the present application;
FIG. 2 is a top view of the sealing device of the present application;
FIG. 3 is a schematic view of the pinch roller structure of the sealing device of the present application;
in the figure: the first curved glass substrate 1, the second curved glass substrate 2, the upper surface 1a, the positioning element 3, the first sealing region 4, the lower surface 2a, the second sealing region 5, the sealing material layer 6, the laser head 7, the pressing assembly 8, the sealing base 9, the surface normal X, the first side edge 1b, the second side edge 2b, the material edge 6a, the pressing head 81, the return spring 82, the guide rod 83, the pressing support 84, the insertion portion 811, the pressing portion 812, the guide portion 813, the rated distance D, the insertion abutment side 811a, the transition side 812a, the vertical portion 84a, the horizontal portion 84b, the pressing wheel 72, the connecting bracket 71, the wheel shaft 73, the front pressing wheel 721, the middle pressing wheel 722, the rear pressing wheel 723, the front connecting bracket 711, the middle connecting bracket 712, the rear connecting bracket 713, the fitting protrusion 2c, and the fitting groove 1c.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings and preferred embodiments.
Fig. 1 to 3 are views showing a curved vacuum glass frit sealing apparatus using laser assistance according to an embodiment of the present invention. The curved vacuum glass to which the manufacturing method according to the embodiment of the present invention is applied may be a soundproof double-layered vacuum glass, a heat-insulating vacuum double-layered glass, or a curved laminated vacuum glass having internal electronic devices.
First, as shown in fig. 1, a first curved glass substrate 1 and a second curved glass substrate 2 are included. As the first curved glass substrate 1 and the second curved glass substrate 2, glass substrates formed of, for example, alkali-free glass or soda lime glass having a known composition can be used. In addition, at least one of the first curved glass substrate 1 and the second curved glass substrate 2 may be chemically tempered glass or the like. The first curved glass substrate 1 and the second curved glass substrate 2 have curved shapes that match each other, and in the drawing, the second curved glass substrate 2 is covered on the first curved glass substrate 1.
The first curved glass substrate 1 has an upper surface 1a, and the upper surface 1a has a positioning element 3 provided thereon. The positioning element 3 defines the distance between the first curved glass substrate 1 and the second curved glass substrate 2.
A rectangular first sealing region 4 is provided along the outer edge of the first curved glass substrate 1 on the peripheral portion of the upper surface 1a of the first curved glass substrate 1. The first sealing region 4 is arranged to enclose the positioning element 3. The second curved glass substrate 2 has a lower surface 2a facing the upper surface 1a of the first curved glass substrate 1. On the peripheral portion of the lower surface 2a of the second curved glass substrate 2, a rectangular second sealing region 5 corresponding to the first sealing region 4 is provided, as shown in fig. 2. The first sealing region 4 and the second sealing region 5 correspond to regions on which the glass frit sealing layer is to be formed.
On the first sealing region 4 of the first curved glass substrate 1 and the second sealing region 5 of the second curved glass substrate 2, as shown in fig. 1, a sealing material layer 6 in a rectangular form is formed along the entire or substantially the entire peripheral portions of the first curved glass substrate 1 and the second curved glass substrate 2. The sealing material layer 6 is a fired layer of a glass frit sealing material containing sealing glass and a laser absorber. The glass frit sealing material includes a sealing glass frit paste and a laser absorber as main components, and an inorganic filler such as a low expansion filler may be combined as occasion demands. The sealing material may contain fillers and additives other than those described above as occasion demands.
For the sealing glass frit paste (frit), a low-temperature melting glass frit such as tin phosphate glass, bismuth glass, vanadium glass or lead glass may be used. Among them, in view of sealing performance (adhesive performance) and reliability (adhesive reliability and airtight sealing performance) of the first curved glass substrate 1 and the second curved glass substrate 2 and influence on the environment and human body, it is preferable to use a low melting point sealing glass containing tin phosphate glass or bismuth glass.
The tin phosphate glass (frit) preferably has a composition comprising 55 to 68 mole percent SnO, 0.5 to 5 mole percent SnO2, and 20 to 40 mole percent P2O 5. As is well known to those skilled in the art, snO is a component that imparts a low melting point to glass. If the content of SnO is less than 55 mole percent, the viscosity of the glass will be high and the sealing temperature will be too high, and if the content exceeds 68 mole percent, the glass will not vitrify. SnO2 is a component that stabilizes glass. If the content of SnO2 is less than 0.5 mole percent, snO2 will separate and precipitate in the softened and molten glass at the time of sealing operation, and fluidity will be impaired and sealing operation performance will be lowered. If the content of SnO2 exceeds 5 mole percent, snO2 may precipitate in the melt of the low temperature molten glass. P2O5 is a component forming a glass skeleton. If the content of P2O5 is less than 20 mole%, the glass will not be vitrified, and if the content exceeds 40 mole%, deterioration in weather resistance may occur, which is a disadvantage peculiar to phosphate glass. Here, the ratio (mole percent) of SnO and SnO2 in the sealing glass frit paste (frit) can be determined as follows: first, the sealing glass frit paste (frit) was subjected to acid decomposition, and then the total amount of Sn atoms contained in the frit was measured by ICP emission spectrometry. Then, the amount of sn2+ (SnO) can be obtained by iodometric titration after acid decomposition, and thus the amount of sn4+ (SnO 2) can be determined by subtracting the amount of sn2+ obtained as described above from the total amount of Sn atoms. The glass formed from the above three components has a low glass transition point and is suitable as a sealing material at low temperature, and it may contain, for example, a component forming a glass skeleton such as SiO2, or a component stabilizing the glass such as ZnO, B2O3, al2O3, WO3, moO3, nb2O5, tiO2, zrO2, li2O, na2O, K2O, cs2O, mgO, caO, srO, or BaO as an optional component.
The bismuth glass (frit) preferably has a composition comprising 70 to 90 mass% of Bi2O3, 1 to 20 mass% of ZnO, and 2 to 12 mass% of B2O 3. As is well known to those skilled in the art, bi2O3 is a component that forms a glass network. If the content of Bi2O3 is less than 70 mass%, the softening point of the low-temperature molten glass will be high, whereby sealing at low temperature will be difficult. If the content of Bi2O3 exceeds 90 mass%, the glass will hardly be vitrified, and furthermore, the coefficient of thermal expansion tends to be too high. ZnO is a component for reducing the thermal expansion coefficient and the like. If the content of ZnO is less than 1 mass%, the glass will be hardly vitrified. If the content of ZnO exceeds 20 mass%, stability in forming a low-temperature molten glass will be lowered, and devitrification may occur. B2O3 is a component that forms a glass skeleton and widens the vitrifiable range of glass. If the content of B2O3 is less than 2 mass%, the glass will hardly be vitrified, and if it exceeds 12 mass%, the softening point will be too high, whereby sealing at low temperature will be difficult even if a load is applied at the time of sealing. The glass formed from the above three components has a low glass transition point and is suitable as a low temperature sealing material, and it may contain optional components such as Al2O3, ceO2, siO2, ag2O, moO3, nb2O3, ta2O5, ga2O3, sb2O3, li2O, na2O, K2O, cs2O, caO, srO, baO, WO3, P2O5, or SnOx (where x is 1 or 2).
In addition, as described above, the sealing material layer 6 further contains a laser absorber. As the laser light absorber, it is known to those skilled in the art that at least one metal selected from Fe, cr, mn, co, ni and Cu, and/or at least one metal compound, for example, an oxide containing the above metal may be used. In addition, materials other than the above-described components, such as vanadium oxide (particularly VO, VO2, and V2O 5), may also be used. The content of the laser absorber is preferably in the range of 0.1 to 40 volume percent of the sealing material layer 6. If the content of the laser absorber is less than 0.1 volume%, the sealing material layer 6 may not be sufficiently melted. If the content of the laser absorber exceeds 40 volume percent, heat may be locally generated at a portion near the interface with the first curved glass substrate 1 and the second curved glass substrate 2, or fluidity of the sealing material at the time of melting may be deteriorated, whereby adhesion with the first curved glass substrate 1 and the second curved glass substrate 2 may be lowered. The content is preferably at most 37 volume percent.
In the present invention, the sealing glass or frit, and the laser absorber may be in powder form or in particle form, respectively. The sealing glass powder may be simply referred to as sealing glass or glass powder, and the laser absorbing particles or laser absorbing powder may be simply referred to as laser absorber.
The sealing material layer 6 is formed in the following manner. First, a laser absorber or the like is blended with a sealing glass powder to prepare a sealing material, and then it is mixed with a carrier to prepare a sealing material paste. It is well known to those skilled in the art that a so-called carrier is a carrier having a resin, such as an adhesive component, dissolved in a solvent. As the resin for the carrier, for example, a cellulose resin such as methyl cellulose, ethyl cellulose, carboxymethyl cellulose, oxyethyl cellulose, benzyl cellulose, propyl cellulose, or nitrocellulose; or an organic resin, such as an acrylic resin obtainable by polymerizing at least one acrylic monomer (e.g., methyl methacrylate, ethyl methacrylate, butyl methacrylate or 2-hydroxyethyl methacrylate, butyl acrylate or 2-hydroxyethyl acrylate). As the solvent, in the case of cellulose resin, a solvent such as terpineol, butyl carbitol acetate, or ethyl carbitol acetate may be used, and in the case of acrylic resin, a solvent such as methyl ethyl ketone, terpineol, butyl carbitol acetate, or ethyl carbitol acetate may be used. The resin component is used as an organic binder in the sealing material and needs to be burned out before the sealing material is fired. The viscosity of the sealing material paste is matched with that according to the apparatus for applying the paste to the first curved glass substrate 1 and the second curved glass substrate 2, and may be adjusted by the ratio of the resin component as the organic binder to the organic solvent or the like or the ratio of the sealing material to the carrier. Known additives for glass paste, such as defoamers or dispersants, may be added to the sealing material paste. For preparing the sealing material paste, a known method using a rotary mixer equipped with stirring blades, a roller mill, a ball mill, or the like can be applied.
As shown in fig. 1 to 2, the glass frit sealing material paste is applied in a frame form on the first sealing region 4 of the first curved glass substrate 1 and the second sealing region 5 of the second curved glass substrate 2 over the entire or substantially the entire peripheral portion along the peripheral portions of the first curved glass substrate 1 and the second curved glass substrate 2, and dried to form the sealing material layer 6. It is well known to those skilled in the art that the glass frit seal paste can be applied to the first sealing region 4 and the second sealing region 5 using, for example, a printing method such as screen printing or gravure printing, or along the first sealing region 4 and the second sealing region 5 using a dispenser or the like. The sealing material layer 6 is preferably dried, for example, at a temperature of at least 120 ℃ for at least 10 minutes. A drying step is performed to remove the solvent in the sealing material layer 6. If the solvent remains in the sealing material layer 6, the organic binder may not be sufficiently burned off in the subsequent firing step (laser firing step).
Then, as shown in fig. 1-2, the rectangular sealing material layer 6 formed of the glass frit sealing material paste is irradiated with a laser head 7 to be fired. By irradiating the path of the sealing material layer 6 with the laser head 7 to heat the glass frit sealing material paste, the sealing material is fired while the organic binder in the glass frit sealing material paste is burned out to form the sealing material layer 6. The laser head 7 for emission is not particularly limited, and a desired laser selected from, for example, a semiconductor laser, a carbon dioxide laser, an excimer laser, a YAG laser, and a HeNe laser may be employed. The same applies to the laser for sealing mentioned later.
When the laser head 7 scans along the rectangular sealing material layer 6 and irradiates it, the heating temperature of the sealing material layer 6 is preferably adjusted to a range around the softening point temperature of the glass frit sealing material paste. Here, the softening point temperature is a temperature at which the sealing glass frit paste softens and flows but does not crystallize.
Further, in the prior art, it is common to control the speed and laser intensity of the laser head 7 to keep the glass frit sealing material at the sealing material layer 6 in a molten state for a long time in the vicinity of the laser head 7 (in terms of the traveling speed of the laser head), by extending the contact time of the glass frit sealing material in a molten state with the solidified first curved glass substrate 1 and the second curved glass substrate 2, it is possible to sufficiently fuse the molten glass frit with the glass substrates on both sides, that is, in other words, by flowing the sealing glass frit in a molten state on the solidified sealing glass substrate, it is possible to prevent the formation of gaps or concentrated stresses caused by the surface tension at the sealing material layer 6. However, as shown in fig. 1, the glass frit paste between the first curved glass substrate 1 and the second curved glass substrate 2 flows in a molten state for a long period of time due to its position in the curvature of the curved surface, and is separated from the first sealing region 4 and the second sealing region 5 where it should be, resulting in a decrease in bonding strength, formation of air holes, or concentration of stress at the final sealing region.
In order to solve the technical problems, the invention provides a curved vacuum glass powder sealing device adopting laser assistance, which is shown in fig. 1-3, and comprises a pressing component 8 and a sealing base 9 besides a first curved glass substrate 1, a second curved glass substrate 2 and a laser head 7.
As shown in fig. 1, the first curved glass substrate 1 is fixedly mounted on a sealing base 9, and the sealing base 9 has an upper surface that matches the lower surface of the first curved glass substrate 1. The plurality of pressing assemblies 8 are slidably mounted on the edge of the sealing base 9, as shown in fig. 2, a plurality of pressing assemblies 8 are mounted around the sealing base 9, and the plurality of pressing assemblies 8 form a circle around the sealing base 9.
In order to ensure that the laser head 7 irradiates the sealing material layer 6 uniformly and stably, as shown in fig. 1, the central axis of the sealing material layer 6 is the surface normal X of the first curved glass substrate 1 and the second curved glass substrate 2, and the central axis of the laser head 7 coincides with the surface normal X, so that the laser head 7 can irradiate and heat the sealing material layer 6 uniformly within the section range at the same section position.
Further, as shown in fig. 1, for the first curved glass substrate 1, there is a first side edge 1b at an edge immediately adjacent to its upper surface 1 a; also, for the second curved glass substrate 2, there is a second side edge 2b at the edge immediately adjacent to the lower surface 2a thereof. As shown in fig. 1, a sealing structure of a first curved glass substrate 1 and a second curved glass substrate 2 is provided with a mutual jogged structure to ensure sealing tightness, as shown in the figure, a jogged groove 1c is formed on an upper surface 1a of the first curved glass substrate 1, a jogged protrusion 2c is arranged on a lower surface 2a of the second curved glass substrate 2 at a position corresponding to the jogged groove 1c, wherein the jogged groove 1c is directly arranged on the upper surface 1a through grinding or one-step forming, the jogged protrusion 2c is a glass seal structure directly arranged on a lower surface 2a of the second curved glass substrate 2 through fusion welding, when the second curved glass substrate 2 is covered on the first curved glass substrate 1, the jogged protrusion 2c and the jogged groove 1c are jogged with each other, a sealing material layer 6 with a convex cross section shape as shown in fig. 1 is formed between the upper surface 1a and the jogged protrusion 2c and the jogged groove 1c, wherein the sealing material layer 6 between the upper surface 1a and the lower surface 2a is formed into a second sealing area 5, and the sealing material layer 6 between the protrusions 1c and the first sealing material layer 4 c is formed into a linear sealing area. The first sealing region 4 and the second sealing region 5 which are formed by the jogged structure and have the zigzag structure enhance the sealing performance of the joint. The sealing material layer 6 has a material edge 6a adjacent to the first side edge 1b and the second side edge 2b. When the glass frit sealing material paste is applied to the first sealing region 4 and the second sealing region 5 by a printing method such as screen printing or gravure printing, or the glass frit sealing material paste is applied along the first sealing region 4 and the second sealing region 5 using a dispenser or the like, the material edge 6a is located between the upper surface 1a and the lower surface 2a and has a set rated distance D from the vicinity of the first side edge 1b and the second side edge 2b. When the laser head 7 heats the sealing material layer 6, the glass frit sealing material is melted to generate fluidity, and the material edge 6a moves to the first side edge 1b and the second side edge 2b under the action of the curved surface, so that the finally formed sealing material layer generates void defects or stress concentration.
For the individual hold-down assembly 8, a hold-down head 81, a return spring 82, a guide bar 83, a hold-down seat 84 is provided, wherein the hold-down head 81 comprises an insertion portion 811, a hold-down portion 812 and a guide portion 813. The pressing head 81 is disposed adjacent to the first side edge 1b and the second side edge 2b, a guide rod 83 is disposed below the pressing head 81, a guide hole 91 matching the guide rod 83 is disposed on the sealing base 9, and the axial direction of the guide hole 91 is perpendicular to the surface normal X of the curved glass at the section position. The insertion portion 811 and the pressing portion 812 of the pressing head 81 are integrally formed, the insertion portion 811 is provided on a side of the pressing portion 812 near the first side edge 1b and the second side edge 2b and protrudes toward the side, the insertion portion 811 has a substantially rectangular cross-sectional structure, the thickness of the insertion portion 811 is equal to the distance between the upper surface 1a of the first curved glass substrate 1 and the lower surface 2a of the second curved glass substrate 2, and the length of the insertion portion 811 protruding from the pressing portion 812 is equal to the rated distance D of the material edge 6a from the first side edge 1b and the second side edge 2b. The side of the insert 811 immediately adjacent to the sealing material layer 6 has an insert abutment side 811a that mates with the material edge 6a.
The insert 811 is connected to the pressing portion 812 by upper and lower transition sides 812a, the upper and lower transition sides 812a having shapes matching the first side edge 1b and the second side edge 2b. The pressing head 81 can slide to a position close to the curved glass and a position far from the curved glass by guiding the guiding rod 83 relative to the sealing base 9. When the pressing head 81 slides to a position close to the curved glass, the insertion contact side 811a is in close contact with the material edge 6a, and the upper and lower transition sides 812a are in close contact with the first side edge 1b and the second side edge 2 b; when the pressing head 81 slides to a position away from the curved glass, the insertion abutment side 811a is separated from the material edge 6a, and the upper and lower transition sides 812a are separated from the first side edge 1b and the second side edge 2b.
In order to ensure that the pressing head 81 can be slidably inserted and reset, a guide portion 813 perpendicular to the insertion direction is provided outside the pressing portion 812, and one end of the guide rod 83 is inserted into the guide hole 91 and the other end is fixedly connected to the guide portion 813. In addition, a pressing support 84 is provided at an edge of the sealing base 9 at a corresponding position, the pressing support 84 is an "L" shaped support structure having a vertical portion 84a and a horizontal portion 84b, the vertical portion 84a is parallel to the edge of the sealing base 9, and a guide portion 813 is provided between the vertical portion 84a of the pressing support 84 and the edge of the sealing base 9. The free end of the horizontal portion 84b of the hold-down support 84 is fixedly attached to the edge of the sealing base 9. The return spring 82 is fitted over the guide rod 83, and one end of the return spring 82 is connected to the edge of the sealing base 9 and the other end is connected to the guide portion 813. The return spring 82 is a compression spring and has an elastic force that always pushes the pressing head 81 away from the curved glass. When the pressing head 81 is pressed and moved to a position close to the curved glass, the guide portion 813 is also limited by the edge of the sealing base 9, and when the pressing head 81 is moved away from the position of the curved glass by the return spring 82, the guide portion 813 is limited by the vertical portion 84a of the pressing support 84.
As shown in fig. 2, the length of each pressing head 81 is approximately equal to the width dimension of the laser head 7, that is, the pressing range of each pressing head 81 is the same as the heating range of the laser head 7 to the sealing material layer 6. The plurality of compacting assemblies 8 are arranged along the periphery of the curved glass, so that the sealing material layers 6 around the curved glass can be compacted.
In order to ensure that when the laser head 7 moves to heat to a place, a pressing head 81 at a corresponding position can be inserted to press the sealing material layer 6, the invention is provided with a pressing wheel 72 which moves synchronously with the laser head 7, the pressing wheel 72 is arranged on the laser head 7 through a connecting bracket 71, the pressing wheel 72 is provided with a wheel shaft 73, the wheel shaft 73 is fixedly arranged on the connecting bracket 71, and the direction of the wheel shaft 73 is parallel to the axial direction of the laser head 7. The pinch roller 72 is disposed outside the pinch head 81. As shown in fig. 2 to 3, due to the movement of the laser head 7, the pinch roller 72 moves in synchronization therewith, and at the same time, the pinch roller 72 can pinch the pinch head 81 to a position close to the curved glass, so that the insertion abutment side 811a of the pinch head 81 is in close contact with the material edge 6a, and the upper and lower transition sides 812a are in close contact with the first side edge 1b and the second side edge 2b, at which time, although the sealing material layer 6 has fluidity due to the heating and melting of the laser head 7, the molten glass frit sealing material is restricted to a rated position due to the fact that the material edge 6a is completely blocked and limited by the insertion abutment side 811a of the pinch head 81, thereby a complete and uniform seal can be formed.
Furthermore, according to the foregoing description about the laser head 7, in the prior art, the glass frit sealing material at the sealing material layer 6 is usually kept in a molten state for a long time in the vicinity of the laser head 7 by controlling the speed and laser intensity of the laser head 7. Therefore, when the laser head 7 enters the position, the sealing material layer 6 in front of the laser head 7 may melt in advance due to heat transfer and radiation with respect to the sealing material layer 6 in front of the laser head 7 due to the larger irradiation power of the laser head 7, and therefore the pressing head 81 needs to be moved in advance to press the sealing material layer 6 in front; meanwhile, since crystallization requires a long period of molten state after the laser head 7 passes the position, the pressing head 81 holding the position is required to continuously press for a while after the laser head 7 passes.
To achieve the above technical effect, as shown in fig. 2 to 3, the pinch roller 72 of the present invention, which moves synchronously with the laser head 7, includes a front pinch roller 721, a middle pinch roller 722, and a rear pinch roller 723. The middle compacting wheel 722 is positioned on one side of the laser head 7 and is close to the laser head, so that the compacting head 81 at the position of the laser head 7 can be compacted; the front pinch roller 721 is located in front of the middle pinch roller 722 (with respect to the traveling direction of the laser head 7), and can pinch the pinch head 81 in front of the position where the laser head 7 is located; the rear pinch roller 723 is located behind the middle pinch roller 722 (with respect to the traveling direction of the laser head 7) and can pinch the pinch head 81 behind the position where the laser head 7 is located. A front connection bracket 711, a middle connection bracket 712, and a rear connection bracket 713 are also provided in association with the front pinch roller 721, the middle pinch roller 722, and the rear pinch roller 723. With the movement of the laser head 7, the pressing heads 81 at the front, middle and rear three positions of the laser head 7 can be synchronously pressed, so that the glass frit sealing material can be in a molten state for a long time, and can be kept in a rated position without flowing out of range.
In order to ensure that the pressing wheel 72 can be smoothly pressed against the pressing heads 81, as shown in fig. 3, each pressing head 81 has a slope to assist the pressing wheel 72 to smoothly press. Furthermore, as known to those skilled in the art, in the heating process of the laser head 7, a pressing device needs to be disposed on the second curved glass substrate 2, and the pressing device may be a vacuum pressing mechanism or a mechanical pressing mechanism.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A curved surface vacuum glass powder sealing device adopting laser assistance comprises:
the device comprises a first curved glass substrate and a second curved glass substrate, wherein the first curved glass substrate is provided with an upper surface, and the upper surface is provided with a positioning element arranged on the upper surface;
a sealing material layer including a sealing glass frit paste having a glass frit sealing material as a main component and a laser absorber, and forming a rectangular region along the entire peripheral portions of the first and second curved glass substrates;
a laser head irradiating an area of the sealing material layer to heat the glass frit sealing material paste;
the method is characterized in that: the glass substrate with the first curved surface is fixedly arranged on the sealing base, the pressing assemblies are slidably arranged at the edge of the sealing base, and the pressing assemblies form a circle around the sealing base; the compressing assembly comprises a compressing head, a reset spring, a guide rod and a compressing support, wherein the compressing head comprises an inserting part, a compressing part and a guide part, and when the compressing head slides to a position close to the curved glass, the inserting part is tightly attached to the edge of the sealing material layer.
2. A curved vacuum glass frit sealing apparatus using laser assist as claimed in claim 1, wherein: the first curved glass substrate has a first side edge at an edge adjacent to the upper surface thereof; the edge of the second curved glass substrate close to the lower surface of the second curved glass substrate is provided with a second side edge; the sealing material layer has a material edge adjacent the first side edge and the second side edge; the material edge is located between the upper and lower surfaces and has a set nominal distance from adjacent first and second side edges.
3. A curved vacuum glass frit sealing apparatus using laser assist as claimed in claim 2, wherein: the pressing head is closely adjacent to the first side edge and the second side edge, a guide rod is arranged below the pressing head, a guide hole matched with the guide rod is arranged on the sealing base, and the axial direction of the guide hole is perpendicular to the surface normal of the curved glass at the section position.
4. A curved vacuum glass frit sealing apparatus using laser assist as claimed in claim 3, wherein: the insertion part and the pressing part of the pressing head are of an integrated structure, the insertion part is arranged on one side, close to the first side edge and the second side edge, of the pressing part and protrudes towards the side, the insertion part is of a rectangular cross-section structure, the thickness of the insertion part is equal to the distance between the upper surface of the first curved glass substrate and the lower surface of the second curved glass substrate, and the length, protruding out of the pressing part, of the insertion part is equal to the rated distance between the material edge and the first side edge and the second side edge.
5. The laser-assisted curved vacuum glass frit sealing apparatus according to claim 4, wherein: the side of the insertion part, which is close to the sealing material layer, is provided with an insertion abutting side matched with the material edge, the insertion part is connected to the pressing part through an upper transition side and a lower transition side, and the shapes of the upper transition side and the lower transition side are matched with the first side edge and the second side edge; when the compaction head slides to a position close to the curved glass, the insertion abutting side is tightly attached to the edge of the material, and the upper and lower transition sides are tightly attached to the first side edge and the second side edge; when the pressing head slides to a position far away from the curved glass, the insertion abutting side is separated from the material edge, and the upper and lower transition sides are separated from the first side edge and the second side edge.
6. A curved vacuum glass frit sealing apparatus using laser assist according to claim 5, wherein: the outside of the pressing part is provided with a guide part perpendicular to the insertion direction, and one end of the guide rod penetrates into the guide hole and the other end of the guide rod is fixedly connected to the guide part.
7. The laser-assisted curved vacuum glass frit sealing apparatus according to claim 6, wherein: the edge of the sealing base is provided with a pressing support, the pressing support is of an L-shaped support structure and is provided with a vertical part and a horizontal part, the vertical part is parallel to the edge of the sealing base, and the guide part is arranged between the vertical part of the pressing support and the edge of the sealing base; the free end of the horizontal part of the compression support is fixedly connected to the edge of the sealing base; the reset spring is sleeved on the guide rod, one end of the reset spring is connected to the edge of the sealing base, and the other end of the reset spring is connected to the guide part.
8. The laser assisted curved vacuum glass frit sealing apparatus according to claim 7, wherein: the laser head is provided with a pressing wheel which moves synchronously with the laser head, the pressing wheel is arranged on the laser head through a connecting bracket and is provided with a wheel shaft, the wheel shaft is fixedly arranged on the connecting bracket, and the direction of the wheel shaft is parallel to the axis direction of the laser head 7.
9. The laser-assisted curved vacuum glass frit sealing apparatus according to claim 8, wherein: the pinch roller includes preceding pinch roller, well pinch roller and back pinch roller.
10. A curved vacuum glass frit sealing apparatus using laser assist as claimed in claim 9, wherein: the front pressing wheel is positioned in front of the middle pressing wheel, and the rear pressing wheel is positioned behind the middle pressing wheel.
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