Vacuum sealing technology of vacuum glass and vacuum sealing equipment used therein

Abstract

The present invention discloses a vacuum sealing process for vacuum glass and a vacuum sealing device used therein. The vacuum sealing steps of the vacuum glass are as follows: firstly, a ring-shaped iron-nickel-cobalt alloy material is placed between two layers of glass to form a double-layer glass product, and then the product is sent to a glass workbench in a vacuum chamber for positioning, and the vacuum chamber is evacuated to 5*10 ‑3 After Pa, the electron beam welding gun is started to fuse the edge of the double-layer glass product with the iron-nickel-cobalt alloy material. The vacuum sealing equipment includes a vacuum chamber, an electron beam welding gun, a vacuum pumping system for evacuating the vacuum chamber, a glass workbench for positioning the double-layer glass product, and an industrial control system. The glass workbench is arranged in the vacuum chamber, and an inlet with a cover is provided on the vacuum chamber. The electron beam welding gun can emit a high-speed electron flow toward the joint of the double-layer glass product. The industrial control system controls the start and stop actions of the electron beam welding gun and the vacuum pumping system. The present invention simplifies the production process of the vacuum glass and ensures the vacuum degree of the vacuum glass.

Description

Technical Field

[0001] The invention relates to the field of glass manufacturing, in particular to a vacuum sealing process of vacuum glass and a vacuum sealing device used therein. Background Art

[0002] The current vacuum glass manufacturing process is: first assemble two pieces of flat glass with adhesive film and seal them together, then heat the sealing film to soften and bond the glass, seal the edges of the two layers of flat glass, and leave an exhaust hole during the sealing process. Generally, a gap of 0.3mm is formed between the two pieces of glass. The vacuum device draws a vacuum inside the gap between the two pieces of flat glass through the exhaust hole, and seals the exhaust hole after the vacuum is completed.

[0003] The manufacturing process of this type of vacuum glass is complicated, and the thermal expansion and contraction coefficients of the sealant and the glass are different. When the finished product is heated or pre-cooled, due to the difference in thermal expansion and contraction coefficients between the sealant and the glass, it is easy for the sealant to debond, which leads to sealing failure. In addition, this process requires evacuating the gap between the two layers of glass after the sealing process. It is difficult to ensure the vacuum degree between the two layers of glass during the evacuation process, and the exhaust holes need to be sealed after sealing. The process is complicated and prone to air leakage. Summary of the invention

[0004] In order to overcome the above defects, the present invention provides a vacuum sealing process for vacuum glass and a vacuum sealing device used therein. The vacuum sealing process for vacuum glass is simple, can ensure the vacuum degree between the two layers of glass of vacuum glass, and is not easy to leak. The technical solution adopted by the present invention to solve its technical problem: a vacuum sealing process for vacuum glass, characterized in that it includes the following steps:

[0005] Step 1: Place a ring-shaped iron-nickel-cobalt alloy material between two layers of glass to form a double-layer glass product;

[0006] Step 2: Send the double-layer glass product equipped with the iron-nickel-cobalt alloy material into a dedicated vacuum chamber, and the double-layer glass product is supported and positioned by the glass workbench in the vacuum chamber;

[0007] Step 3: Evacuate the dedicated vacuum chamber to 5*10 -3 Pa;

[0008] Step 4: Start the electron beam welding gun in the vacuum chamber to fuse the edge of the double-layer glass product with the iron-nickel-cobalt alloy material to achieve a sealing welding effect.

[0009] The two layers of glass and the annular iron-nickel-cobalt alloy material in the middle are placed together in a vacuum chamber, and the vacuum chamber is evacuated to 5*10-3Pa, so that the vacuum degree in the double-layer glass product is also 5*10-3Pa. After welding, there is no need to evacuate the gap between the double-layer glass. During welding, the high-speed electron flow converged by the electron beam welding gun bombards the joint of the workpiece to generate high temperature (up to 6000℃), so that the iron-nickel-cobalt alloy material in the weld forms a molten pool, so that the two layers of glass and the iron-nickel-cobalt alloy material are fused and welded together. The best iron-nickel-cobalt alloy material is 4J29 iron-nickel-cobalt alloy. 4J29 iron-nickel-cobalt alloy has a linear expansion coefficient similar to that of silicon-boron hard glass between 20 and 450℃, and has good low-temperature structural stability. The oxide film of iron-nickel-cobalt alloy is dense and can be well infiltrated by glass. The iron-nickel-cobalt alloy added between the glass acts as a medium, making the weld airtight and stable and durable. During long-term use, the weld will not open due to thermal expansion and contraction, thus avoiding air leakage and ensuring the vacuum degree between the vacuum glasses.

[0010] As a further improvement of the present invention, the annular iron-nickel-cobalt alloy material is an annular sheet with a thickness of 0.3 mm and a width of 15 mm, and the outer edge of the annular iron-nickel-cobalt alloy material is aligned with the outer edges of the two layers of glass. Before welding, an annular iron-nickel-cobalt alloy sheet with a thickness of 0.3 mm and a width of 15 mm is first made, which is sandwiched between the double-layer glass, and the outer edge is aligned with the outer edge of the double-layer glass. After welding, the vacuum glass is firmly welded and has a beautiful appearance. The annular iron-nickel-cobalt alloy sheet is more convenient for rapid assembly and positioning with the double-layer glass. In addition, the annular iron-nickel-cobalt alloy can also be formed between the edges of the two layers of glass by pad printing, brushing, etc. This is an equivalent replacement structure that can be easily thought of by technicians in this application, and it also belongs to the protection scope of this application.

[0011] As a further improvement of the present invention, at least one of the two layers of glass is low-emissivity glass, so as to minimize the heat lost by conduction, convection and radiation of the vacuum glass, thereby achieving energy-saving effect.

[0012] As a further improvement of the present invention, in step 3, while the vacuum chamber is evacuated, the heating device is turned on to heat the double-layer glass product, and when the heating temperature of the double-layer glass product reaches above 300° C., the double-layer glass product is welded. Heating and baking the glass before welding can promote the discharge of gas on the glass surface and achieve a better vacuum effect.

[0013] The double-layer glass product is heated by infrared lamps in the vacuum chamber. Other heating methods, such as resistance wires, etc., can also be used as long as the heating effect is achieved.

[0014] As a further improvement of the present invention, step 4 includes the following sub-steps:

[0015] (1) Double-glazed product welding length and travel speed on the industrial control system;

[0016] (2) Start the electron beam welding gun and the transmission roller motor located on both sides of the glass workbench to weld the two opposite sides of the double-glazed product;

[0017] (3) Start the motor of the rotating table of the glass workbench to rotate the rotating table 90 degrees so that the electron beam welding gun is aimed at the other two opposite sides of the double-glazed product;

[0018] (4) Set the welding length and travel speed of double-glazed products on the industrial control system;

[0019] (5) Start the electron beam welding guns and drive roller motors on both sides to weld the other two opposite sides of the double-layer glass product to form vacuum glass.

[0020] During welding, the industrial control system is used to set the welding parameters. The industrial control system can manually and automatically control various functions of the equipment, such as vacuuming, heating and baking, glass movement, and glass welding. During the welding process, the glass is rotated and moved horizontally by the glass workbench, so that the glass is welded directly with the electron beam welding gun in sequence around a circle. A double-sided electron beam welding gun is used to weld two sides at a time, and the welding can be completed in two times, with high welding efficiency.

[0021] A vacuum sealing device comprises a vacuum chamber, an electron beam welding gun, a vacuum pumping system, a glass workbench and an industrial control system. The glass workbench is arranged in the vacuum chamber, and can position a double-layer glass product to be welded. The vacuum chamber is provided with an inlet for placing the double-layer glass product to be welded, and the vacuum chamber is also provided with a cover capable of sealing the inlet. At least one electron beam welding gun is installed on the side wall of the vacuum chamber, and the electron beam welding gun can emit a high-speed electron flow toward a joint of the double-layer glass product to be welded on the glass workbench. The high-speed electron flow bombards the joint of the double-layer glass product to be welded so that the glass to be welded and an annular iron-nickel-cobalt alloy material are fused and welded together. The vacuum pumping system can vacuum the vacuum chamber to a set vacuum degree, and the industrial control system controls the start and stop actions of the electron beam welding gun and the vacuum pumping system.

[0022] As a further improvement of the present invention, the electron beam welding gun is fixedly installed in the vacuum chamber, the glass workbench includes a transmission roller, a rotating table, a transmission roller motor, a rotating table motor and a rotating shaft sealing seat, the rotating table can be installed in the vacuum chamber so as to rotate around a vertical rotating axis, a plurality of transmission rollers are arranged in parallel and spaced apart above the rotating table, the transmission rollers can rotate around a horizontal rotating axis, the double-layer glass products to be welded can be supported on each transmission roller, the transmission roller motor drives each transmission roller to rotate synchronously in the same direction through a transmission mechanism, the rotating table motor is fixedly installed on the outside of the vacuum chamber, a rotating shaft sealing seat is provided on the vacuum chamber, the power output shaft dynamic seal of the rotating table motor is passed through the rotating shaft sealing seat, the power output shaft of the rotating table motor is coaxially fixedly connected to the rotating table, and the industrial control system controls the start, stop and steering of the transmission roller motor and the rotating table motor.

[0023] As a further improvement of the present invention, an infrared heating lamp tube is fixedly provided in the vacuum chamber, and the infrared heating lamp tube is located directly above the glass workbench.

[0024] As a further improvement of the present invention, the inlet of the vacuum cavity is located above the vacuum cavity and directly above the glass workbench. A vacuum sensing device is also provided in the vacuum cavity, and the vacuum sensing device is electrically connected and communicated with the industrial control system.

[0025] The beneficial effects of the present invention are as follows: the present invention sandwiches a layer of annular iron-nickel-cobalt alloy thin sheet between two layers of glass, and performs welding and forming by an electron beam welding gun in a vacuum environment. Since the entire welding and sealing environment is performed in a vacuum environment, a vacuum cavity is automatically formed between the two layers of glass, and there is no need to perform a vacuum operation after welding is completed, and subsequent sealing of the vacuum port is avoided. The production process of the vacuum glass is simplified, the vacuum degree of the vacuum glass is guaranteed, and the iron-nickel-cobalt alloy is used as the welding medium. The iron-nickel-cobalt alloy has a linear expansion coefficient similar to that of silicon-boron hard glass between 20 and 450° C., and has good low-temperature structural stability. After welding is completed, the iron-nickel-cobalt alloy and the glass will not open due to thermal expansion and contraction, and since the oxide film of the iron-nickel-cobalt alloy is dense, it can be well infiltrated by the glass. After welding, the weld has good sealing performance and is stable, strong and durable, and no leakage will occur during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view of two layers of glass and an annular Fe-Ni-Co alloy sheet being assembled;

[0027] Figure 2 for Figure 1 Middle AA section view;

[0028] Figure 3 for Figure 2 Enlarged view of middle part B;

[0029] Figure 4 This is the schematic diagram of the vacuum sealing equipment structure. DETAILED DESCRIPTION

[0030] Embodiment: A vacuum sealing process of vacuum glass, the specific steps are as follows:

[0031] Step 1: Select the first layer of glass 1 and the second layer of glass 2. The first layer of glass is ordinary glass, and the second layer of glass is low-emissivity glass. A 0.3mm thick, 15mm wide, 4J29 annular iron-nickel-cobalt alloy sheet 3 is placed between the first and second layers of glass. The annular iron-nickel-cobalt alloy sheet is aligned and fixed around the first and second layers of glass to form a double-layer glass product 4.

[0032] Step 2: Open the top cover of the vacuum chamber 5 and place the glass product to be welded on the glass workbench in the vacuum chamber 5;

[0033] Step 3: Start the vacuum system (vacuum pump) to evacuate the vacuum chamber 5, and turn on the infrared lamp to heat the vacuum glass;

[0034] Step 4: When the vacuum degree of the vacuum chamber 5 reaches 5*10 -3 Pa, and when the glass heating temperature reaches 300°C, prepare to weld the vacuum glass;

[0035] Step 5: Set the vacuum glass welding length and travel speed on the industrial control system, start the electron beam welding guns 6 and the transmission roller motors on both sides, and weld both sides of the glass product to be welded first;

[0036] Step 6: Start the rotary table motor to rotate the rotary table 90°, aim the electron beam welding gun 6 at the other two sides of the vacuum glass, set the vacuum glass welding length and travel speed on the industrial control system, start the electron beam welding gun 6 and the transmission roller motor on both sides, and weld the other two sides of the vacuum glass.

[0037] A vacuum sealing device used in a vacuum sealing process of vacuum glass comprises a vacuum cavity 5, an electron beam welding gun 6, a vacuum pumping system, a glass workbench and an industrial control system. The glass workbench is arranged in the vacuum cavity 5, and the glass workbench can position a double-layer glass product to be welded. The vacuum cavity 5 is provided with an inlet for placing the double-layer glass product to be welded. The vacuum cavity 5 is also provided with a cover 7 capable of sealing the inlet. At least one electron beam welding gun 6 is installed on the side wall of the vacuum cavity 5. The electron beam welding gun 6 can emit a high-speed electron flow toward the joint of the double-layer glass product to be welded on the glass workbench. The high-speed electron flow bombards the joint of the double-layer glass product to be welded so that the glass to be welded and the annular iron-nickel-cobalt alloy material are fused and welded together. The vacuum pumping system can evacuate the vacuum cavity 5 to a set vacuum degree. The industrial control system controls the start and stop actions of the electron beam welding gun 6 and the vacuum pumping system. During the welding process, the assembled double-layer glass product to be welded is supported and positioned by the glass workbench, the vacuum chamber 5 is evacuated by the vacuum pumping system, and the electron beam welding gun 6 directs high-speed electron flow into the gap at the edge of the double-layer glass. As the electron beam welding gun 6 and the glass product to be welded move relative to each other, the high-speed electron flow bombards along the gap of the double-layer glass, thereby achieving comprehensive welding of the double-layer glass around the circle.

[0038] The electron beam welding gun 6 is fixedly installed in the vacuum chamber 5. The glass workbench includes a transmission roller 8, a rotating table 9, a transmission roller motor 10, a rotating table motor 11 and a rotating shaft sealing seat 12. The rotating table 9 can be installed in the vacuum chamber 5 to rotate around a vertical rotating axis. A plurality of transmission rollers 8 are arranged in parallel and spaced apart above the rotating table. The transmission rollers 8 can rotate around a horizontal rotating axis. The double-layer glass products to be welded can be supported on each transmission roller 8. The transmission roller motor 10 drives each transmission roller 8 to rotate synchronously in the same direction through a transmission mechanism. The rotating table motor 11 is fixedly installed on the outside of the vacuum chamber 5. A rotating shaft sealing seat 12 is provided on the vacuum chamber 5. The power output shaft of the rotating table motor 11 is dynamically sealed and penetrated in the rotating shaft sealing seat 12. The power output shaft of the rotating table motor 11 is coaxially fixedly connected to the rotating table 9. The industrial control system controls the start, stop and steering of the transmission roller motor 10 and the rotating table motor 11. During welding, the double-layer glass product to be welded is placed on the surface of the driving roller 8, and the electron beam welding gun 6 located on the side of the vacuum chamber is just opposite to the gap between the double-layer glass. After the electron beam welding gun 6 starts to emit high-speed electron flow for welding, the driving roller 8 drives the glass to move in a straight line, so that the edge of the glass facing the electron beam welding gun 6 is completely welded, and then the rotating table 9 rotates 90°, and the driving roller 8 drives the glass to move in a straight line again, so that the edge of the other side of the glass is completely welded. It is best to set an electron beam welding gun 6 on each of the two opposite side walls of the vacuum chamber, so that the two opposite side edges of the glass can be welded at one time, and the welding efficiency is high. Of course, if it is circular glass, the driving roller 8 is not required, and the rotating table 9 only needs to drive the glass to rotate one circle. Glass of different shapes can be welded by designing the movement path according to actual needs. In addition, in addition to using the glass movement to face the electron beam welding gun 6 for welding, the electron beam welding gun 6 can also be used to rotate around the outer edge of the glass for one circle to achieve glass sealing welding. These are equivalent replacement structures that can be easily thought of by technical personnel in this field based on this application and belong to the protection scope of this application.

[0039] An infrared heating lamp 13 is also fixedly disposed in the vacuum chamber 5 , and the infrared heating lamp 13 is located just above the glass workbench.

[0040] The inlet of the vacuum chamber 5 is located above the vacuum chamber 5 and directly above the glass workbench. A vacuum sensing device is also provided in the vacuum chamber 5. The vacuum sensing device is electrically connected and communicated with the industrial control system.

[0041] The inlet of the vacuum chamber 5 is placed just above the glass workbench, which makes it convenient for personnel or a robot to place the assembled double-layer glass product to be welded stably on the glass workbench to prevent lateral relative movement between the glasses resulting in misalignment. During the vacuuming process, the vacuum degree in the vacuum chamber 5 and the vacuum degree between the vacuum glasses are detected by a vacuum sensing device, which is conducive to automated welding.

Claims

1. A vacuum sealing process for vacuum glass, characterized in that: The steps include: Step 1: Place a ring-shaped iron-nickel-cobalt alloy material between two layers of borosilicate hard glass to form a double-layer glass product. The iron-nickel-cobalt alloy material is selected from 4J29 iron-nickel-cobalt alloy which has a linear expansion coefficient similar to that of borosilicate hard glass between 20 and 450°C and has good low-temperature structural stability; Step 2: Send the double-layer glass product equipped with the iron-nickel-cobalt alloy material into a dedicated vacuum chamber, and the double-layer glass product is supported and positioned by the glass workbench in the vacuum chamber; Step 3: Evacuate the dedicated vacuum chamber to 5*10 -3 Pa; Step 4: Start the electron beam welding gun in the vacuum chamber to fuse the edge of the double-layer glass product with the iron-nickel-cobalt alloy material to achieve the effect of sealing welding. During welding, the high-speed electron flow converged by the electron beam welding gun bombards the joint of the workpiece to generate a high temperature of up to 6000°C, so that the iron-nickel-cobalt alloy material in the weld forms a molten pool, so that the two layers of silicon boron hard glass and the iron-nickel-cobalt alloy material are fused and welded together. The oxide film of the iron-nickel-cobalt alloy is dense and can be well infiltrated by glass. The iron-nickel-cobalt alloy is added between the silicon boron hard glass to act as a medium, making the weld sealable and stable and durable. There will be no open welding due to thermal expansion and contraction during long-term use.

2. The vacuum sealing process of vacuum glass according to claim 1, characterized in that: The annular iron-nickel-cobalt alloy material is an annular thin sheet with a thickness of 0.3 mm and a width of 15 mm. The outer edge of the annular iron-nickel-cobalt alloy material is aligned with the outer edges of the two layers of borosilicate hard glass.

3. The vacuum sealing process of vacuum glass according to claim 1, characterized in that: At least one of the two layers of borosilicate hard glass is low-emissivity glass.

4. The vacuum sealing process of vacuum glass according to claim 1, characterized in that: In the step three, the vacuum chamber is evacuated and the heating device is turned on to heat the double-layer glass product. When the heating temperature of the double-layer glass product reaches above 300° C., the double-layer glass product is welded.

5. The vacuum sealing process of vacuum glass according to claim 4, characterized in that: Infrared lamps are used in the vacuum chamber to heat the double-layer glass product.

6. The vacuum sealing process of vacuum glass according to claim 1, characterized in that: Step 4 includes the following steps: (1) The welding length and travel speed of double-glazed products on the industrial control system; (2) Start the electron beam welding gun and the drive roller motor located on both sides of the glass workbench to weld the two opposite sides of the double-layer glass product; (3) Start the motor of the rotating table of the glass workbench and rotate the rotating table 90° so that the electron beam welding gun is aimed at the other two opposite sides of the double-glazed product; (4) Set the welding length and travel speed of double-glazed products on the industrial control system; (5) Start the electron beam welding guns and drive roller motors on both sides to weld the other two opposite sides of the double-layer glass product to form vacuum glass.

7. A vacuum sealing device used in the vacuum sealing process of vacuum glass according to claim 1, characterized in that: The invention comprises a vacuum chamber (5), an electron beam welding gun (6), a vacuum pumping system, a glass workbench and an industrial control system. The glass workbench is arranged in the vacuum chamber and can position the double-layer glass product to be welded. The vacuum chamber is provided with an inlet for placing the double-layer glass product to be welded. The vacuum chamber is also provided with a cover (7) capable of sealing the inlet. At least one electron beam welding gun is installed on the side wall of the vacuum chamber. The electron beam welding gun can emit a high-speed electron flow toward the joint of the double-layer glass product to be welded on the glass workbench. The high-speed electron flow bombards the joint of the double-layer glass product to be welded so that the silicon boron hard glass to be welded and the annular iron-nickel-cobalt alloy material are fused and welded together. The vacuum pumping system can evacuate the vacuum chamber to a set vacuum degree. The industrial control system controls the start and stop actions of the electron beam welding gun and the vacuum pumping system. The beam welding gun is fixedly installed in a vacuum chamber. The glass workbench comprises a transmission roller (8), a rotating table (9), a transmission roller motor (10), a rotating table motor (11) and a rotating shaft sealing seat (12). The rotating table is installed in the vacuum chamber so as to be rotatable around a vertical rotating shaft. A plurality of transmission rollers are arranged in parallel and spaced apart above the rotating table. The transmission rollers are rotatable around a horizontal rotating shaft. Double-layer glass products to be welded can be supported on each transmission roller. The transmission roller motor drives each transmission roller to rotate synchronously in the same direction through a transmission mechanism. The rotating table motor is fixedly installed outside the vacuum chamber. A rotating shaft sealing seat is provided on the vacuum chamber. A power output shaft dynamic seal of the rotating table motor is inserted into the rotating shaft sealing seat. The power output shaft of the rotating table motor is coaxially fixedly connected to the rotating table. The industrial control system controls the start, stop and direction of the transmission roller motor and the rotating table motor.

8. The vacuum sealing device according to claim 7, characterized in that: An infrared heating lamp tube (13) is also fixedly arranged in the vacuum chamber, and the infrared heating lamp tube is located directly above the glass workbench.

9. The vacuum sealing device according to claim 7, characterized in that: The inlet of the vacuum cavity is located above the vacuum cavity and directly above the glass workbench. A vacuum degree sensing device is also provided in the vacuum cavity. The vacuum degree sensing device is electrically connected and communicated with the industrial control system.

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