Vacuum glass compounded by using two or more glass plates has been absorbed more and more attention by people due to excellent sound insulation and heat insulation performances, so various vacuum glass manufacturing methods and corresponding vacuum glass products have been provided successively. The applicant has also invented a composite glass plate sealing technique and a vacuum glass product processed by using the technique through years of research and a large amount of experiments, and has applied to the China's State Intellectual Property Office for the patent. The periphery of the glass plates is air-tightly sealed by adopting a metal welding process in the composite glass plate sealing technique provided by the applicant; and before sealing, firstly, metal layers solidified together with the glass plates are preformed on the surface of the periphery of the glass plates, then the two or more glass plates are compounded, and the corresponding metal layers on the two adjacent glass plates are air-tightly sealed and connected by the metal welding process after compounding. During welding, the two metal layers can be mutually welded and connected directly, a metal sealing plate can also be arranged between the two metal layers, and air-tight sealing of the edges of the glass layers is realized by welding and connecting the metal sealing plate and the two metal layers. The structure of the vacuum glass is shown as a FIG. 1 and a FIG. 2, wherein the FIG. 1 shows that the two metal layers are directly welded and connected, and the FIG. 2 shows that the two metal layers are sealed through the metal sealing plate with U-shaped section.
For the composite glass plate sealing technique previously provided by the applicant, generally the two pieces of glass are sealed, then the compounded glass plates are vacuumized through a reserved air extraction port, and finally, the air extraction port is sealed. The manufacturing process is complex and needs complex manufacturing equipment, also brings certain uncertainty to the quality of a product, limits the processing efficiency of the vacuum glass and increases the manufacturing cost of the vacuum glass.
In addition, the vacuum glass can also be manufactured by using a vacuum chamber, namely the compounded glass plates are conveyed to the vacuum chamber, and vacuumizing and sealing operations of the vacuum glass are completed in the vacuum chamber. The glass plates for forming the vacuum glass and a middle support in the vacuum space are deformed under the stress of atmospheric pressure, and the deformation certainly causes that the vacuum space in the vacuum glass is reduced and the vacuum degree of the vacuum glass declines, so it is difficult to ensure the vacuum degree of the vacuum glass manufactured by using the vacuum chamber.
Invention Contents
With respect to the problems of the above existing technology, the present invention aims to provide a vacuum glass sealing device with simple structure, operation convenience, stable quality, high sealing efficiency and no air extraction port.
In order to fulfill the purposes, the vacuum glass sealing device comprises an air extraction table, an upper pressing plate and a heating device; the air extraction table is provided with an accommodating groove for placing glass plates to be sealed, the upper pressing plate is pressed on the glass plates to be sealed in the accommodating groove and air-tightly connected with the air extraction table around the periphery of the accommodating groove, and then the glass plates to be sealed are sealed in a closed space; and the air extraction table and/or the upper pressing plate are provided with air extraction ports, the air extraction ports are used for vacuumizing the closed space and the glass plates to be sealed in the closed space, and the heating device is used for heating the parts to be sealed on the glass plates to be sealed from the exterior of one side of the upper pressing plate and/or the exterior of one side of the air extraction table so as to complete metal welding of the parts to be sealed.
Further, the upper pressing plate is air-tightly connected with the air extraction table around the periphery of the accommodating groove through a sealing ring, and the sealing ring is arranged in a sealing ring installation groove on the air extraction table and/or the upper pressing plate.
Further, the heating device is an inductive heating device or a microwave heating device, and correspondingly, the upper pressing plate or the air extraction table positioned between the heating device and the glass plate to be sealed is made of nonmetallic material.
Further, the heating device is a laser heating device, and the upper pressing plate or the air extraction table positioned between the heating device and the glass plate to be sealed is made of transparent material.
Further, the heating device is arranged on an operating mechanism and carried by the operating mechanism to move along the parts to be sealed on the glass plates to be sealed so as to complete welding of the parts to be sealed on the periphery of the glass plates.
Further, the air extraction table is arranged on a known multi-degree-of-freedom movement mechanism and driven by the movement mechanism so that the parts to be sealed on the glass plates to be sealed move relative to the heating device so as to complete welding of the parts to be sealed.
Further, the sealing device also comprises a clamping device, and the upper pressing plate and the air extraction table are mutually fixed through the clamping device.
Further, the upper pressing plate is made of nonmetallic material, the heating device is an inductive heating device, and the heating device heats the parts to be sealed on the glass plates to be sealed from one side of the upper pressing plate; and the upper pressing plate is also provided with an annular pressing plate, the annular pressing plate is positioned on the periphery of the accommodating groove, the clamping device is a clamping flange, the clamping flange presses the upper pressing plate on the air extraction table through the annular pressing plate, and a plurality of clamping rings are arranged along the annular pressing plate.
Further, the air extraction table consists of a bottom plate and an annular surrounding plate, the lower end of the annular surrounding plate is situated on the bottom plate and sealed with the bottom plate through a sealing ring, the sealing ring is arranged in an installation groove at the bottom plate and/or the lower end of the annular surrounding plate, and the inner side of the annular surrounding plate and the upper surface of the bottom plate form the accommodating groove together; and the upper end of the annular surrounding plate is air-tightly connected with the upper pressing plate through a sealing ring, and the sealing ring is arranged in an installation groove at the upper pressing plate and/or the upper end of the annular surrounding plate.
Further, the air extraction port is formed on the air extraction table, a plurality of air extraction holes are arranged around the air extraction table at intervals, or a plurality of air extraction ports are arranged on the bottom plate of the air extraction table.
According to the vacuum glass sealing device of the present invention, the air extraction table and the upper pressing plate form a closed space in the sealing device, and the upper pressing plate is directly pressed on the glass plate to be sealed, so enough pre-pressing force is provided for the glass plates, the compound state of the glass plates before welding and the stability of positions in the accommodating grooves are ensured, smooth welding of the glass plates is ensured, the volume of the closed space is furthest reduced, and conditions are created for quick vacuumizing of the closed space and quick sealing of the vacuum glass.
Because the upper pressing plate in the sealing device of the present invention is pressed on the glass plate, the pressure of atmosphere is directly acted on the glass plate and the middle support through the upper pressing plate, compressive deformation of the glass plates for forming the vacuum glass and the middle support already happens at the same time of completing vacuumizing of the vacuum glass, and the sealed vacuum glass continuously generates very little compressive deformation after leaving the air extraction table, so vacuum glass products with high vacuum degree and stable vacuum degree can be processed by using the sealing device.
The closed space in the sealing device of the present invention is only used for providing a vacuum environment, and the heating device for welding is separately arranged at the exterior, so equipment operation is convenient, equipment construction is simplified, and a condition is created for large-scale processing of the vacuum glass.