On-line detection method of vacuum degree of vacuum glass based on optical reflection law

Abstract

Disclosed is an online detection method for a vacuum degree of vacuum glass based on the optical reflection law. The object of the method is to perform real-time online detection for a change of a vacuum degree in the vacuum glass when air exhaust and sealing of the vacuum glass are performed, and change detection is taken as a means of quality control to meet a production requirement and improve the yield. The technical scheme of the method is as follows: a multi-reflection light path is built through reflection of a detection light beam by utilizing four surfaces of a piece of upper plate glass and a piece of a lower plate glass of the vacuum glass; in an air exhaust and sealing step of a production process of the vacuum glass, a certain amount of concave deformation occurs on surfaces of the upper layer plate glass and the lower layer plate glass under the action of a pressure difference generated due to the fact that a slit in the vacuum glass acts with external atmospheric pressure, the concave deformations lead to a movement of a light spot of the reflection light path, a change of the internal pressure of the vacuum glass can be determined according to the movement of the light spot of the reflection light path, and a value of the internal pressure of the vacuum glass is determined according to a displacement of the movement of the reflection light spot. So the object of the quality control is achieved, and then the leave-factory yield of the vacuum glass is improved.

Description

technical field [0001] The invention belongs to the technical field of building material production detection, and in particular relates to a method for online detection of vacuum degree in the production process of vacuum glass. Background technique [0002] Generally speaking, glass is transparent, airtight, brittle and has a certain hardness. Among them, soda-lime glass is the most common. Glass has relatively stable chemical properties in daily environments and is not easy to chemically react with substances, so it has a wide range of uses. The vacuum glass formed by sealing and pumping two pieces of ordinary glass has certain advantages in sound insulation, heat insulation and heat preservation, and is relatively light in weight and thin in thickness. As people attach great importance to building energy saving, emission reduction and energy saving, vacuum glass has been rapidly developed and widely used in building curtain walls, doors and windows in recent years. [0...

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Problems solved by technology

[0004] Since the internal pressure of the vacuum glass slit cannot be measured by a direct method (vacuum gauge), and there is no corresponding measurement method and standard at home and abroad, the indirect method is currently used to measure the internal pressure of the vacuum glass, such as heat Radiation method and acoustic transmission method, but due to the complex operation and uncontrollable parameters, cannot be applied in the actual production process. At present, the following patents exist for the vacuum degree detection of vacuum glass in my country:

[0005] Patent Publication No.: CN 101358890A, which discloses an online non-destructive testing method for vacuum degree of vacuum glass. Its technical solution is to indirectly describe the vacuum glass by observing the relationship between the size of the stress spot and the distribution shape at the supporting point of the vacuum glass with a polarized photoelasticometer. Vacuum retention, although this method can obtain the vacuum retention and attenuation of engineering vacuum glass to judge the performance and use status of vacuum glass in service, but because the size of the internal support of the vacuum glass is small and each support is placed Depending on the position, the stress generated by the contact with the glass is different. It is subjective when selecting the stress spot, so it is inaccurate to judge the degree of vacuum by measuring the stress spot.

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