Device and method for real-time detection of thickness of wide-width flexible board

Abstract

The invention relates to a device and method for detecting the thickness of a wide flexible plate in real time. The device comprises an upper surface distance measuring unit, a lower surface distance measuring unit, an upper guide rail, a lower guide rail, an upper sliding block and a lower sliding block; the upper guide rail and the lower guide rail are arranged in parallel, the upper sliding block and the lower sliding block slide along the upper guide rail and the lower guide rail respectively, the upper surface distance measuring unit and the lower surface distance measuring unit are fixedly connected with the upper sliding block and the lower sliding block respectively, and the upper sliding block and the lower sliding block are in synchronous motion; the upper surface distance measuring unit and the lower surface distance measuring unit respectively comprise a laser displacement sensor, a laser structure light source, a video camera and a beam splitter; the included angle between the normal direction of the beam splitter and the exit direction of light of the laser displacement sensor is 135 degrees, the included angle between the normal direction of the beam splitter and the exit direction of the laser structure light source is 45 degrees, and the normal of the beam splitter, the exit light of the laser displacement sensor and the exit light of the laser structure light source are located in the same plane; a shot of the video camera faces the beam splitter. The method comprises the following steps that 1) calibration is conducted on the upper surface distance measuring unit; 2) calibration is conducted on the lower surface distance measuring unit; 3) calibration is conducted on a thickness detection device; 4) the thickness is detected. The method and device can be widely used in real-time detection of the thickness of the wide flexible plate.

Description

technical field [0001] The invention relates to a device and method for real-time detection of thickness, in particular to a device and method for real-time detection of thickness of a wide-width flexible board. Background technique [0002] Generally, the production of A2 grade fireproof material board needs to mix inorganic fire-resistant material and organic glue firstly, heat and solidify after vibrating roller extrusion, and form a 3mm flexible board with uniform thickness. After molding, the core board and the upper and lower aluminum boards are glued separately catch. In order to improve production efficiency and stabilize product quality, the production of A2 grade fireproof material boards needs to be fully automated. In order to realize the on-line quality control of the thickness, flatness, defects, and bonding strength of the fireproof board, the thickness and surface state of the core board obtained by thermosetting are important indicators reflecting the state...

AI Technical Summary

Problems solved by technology

[0005] The existing method has the following problems: for the plate to be measured that is inclined in the direction of plate feeding, the laser point triangulation method cannot correct the inclination, and the laser bar triangulation method can only correct the plate feeding direction. The measurement error caused by the inclination angle of the direction, and for the A2 grade fireproof material core board, the board width is large and the material has a certain degree of flexibility, there may be a certain bending or inclination in the feeding direction and the width direction, laser measurement The laser pointing direction from the sensor may be non-perpendicular to the local plane of the flexible sheet. If the existing method is used for measurement and calculation, there will be a large thickness measurement error

[0010] Among them, α is close to π / 2, and l is a small amount. It can be seen that the first item in the formula is the main source of error. When the θ angle exceeds 1.1°, the thickness measurement error exceeds 2%, that is, when the measured thickness is 5mm, the system error If it exceeds 0.1mm, the production requirements cannot be met at this time; and the method of thickness measurement using the principle of laser strip triangulation can only correct the inclination along the feeding direction of the flexible sheet

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