Fast measuring method of right angle of large-sized rectangular glass substrate and measuring instrument thereof

Abstract

The invention relates to a method for measuring the right angle of a large-sized rectangular glass substrate by utilizing a plane geometry principle and a linear displacement sensor and singlechip technology and measuring the displacements of two parallel edges of glass as well as a measuring instrument thereof. The accurate positioning of the glass substrate is realized by utilizing upper buses of two positioning columns positioned at the bottom of equipment and a side bus of a positioning column positioned at the left side of the equipment as standards; a part to be measured of the left side surface of the glass substrate stresses a mandril of the measuring instrument to generate the displacement; if the bottom edge of the glass substrate is not perpendicular to the side edge of the glass substrate, the reading value of the measuring instrument can be different by overturning the glass substrate by the displacement of 180 degrees, and a half of a difference value is right angle measuring data. The invention can fast and conveniently measure whether the right angle of the adjacent edges of the glass is in a range of 1 / 1000 or not; and in addition, the measuring method can realize the fast, efficient and easy operation in the production of the large-sized rectangular glass substrate, is convenient and fast, is lower in cost and better meets the requirements for the flow operation of a glass production line.

Description

technical field [0001] The invention relates to a method for measuring the right angle of a large-sized rectangular glass substrate by measuring the displacement of two parallel sides of the glass by using the principle of plane geometry, a linear displacement sensor and a single-chip microcomputer technology and a measuring instrument thereof. Background technique [0002] At present, it is a troublesome thing to measure the right angle of a large-size glass substrate. For the measurement of the perpendicular angle of flat objects, there are roughly two basic methods: optical methods and mechanical methods. [0003] 1. Optical method: Using the principle of light reflection, a laser emitting instrument fixed relative to the reference plane emits a straight line of light. The light is reflected by the emitting instrument, and the measuring instrument moves on the measured surface to measure the reading change of the reflected light on the scale instrument. This change value...

AI Technical Summary

Problems solved by technology

[0006] In the inspection of the right angle of traditional glass production and cutting, the comparison method is mainly used, that is, a square with the specified accuracy and the same size as the glass is used for close comparison. First, because the glass substrate is large and thin, it is difficult to handle, and it is slightly careless glass will shatter

Second, when the glass substrate is placed on the platform, there will be scratches on the glass surface, which will cause the inspected glass substrate to be scrapped

Third, due to the troublesome operation of the comparison method, there will be measurement errors if you are not careful, resulting in wrong results and misleading production

Recently, high-precision measurement equipment such as laser alignment systems have also appeared on the market, but due to their high cost, they are not suitable for glass substrate inspection.

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