Principle and application of double sensor - Solutions - Huaqiang

Photocoupler

1. In the automatic feeding process, due to some objective factors, double or multiple sheets of material may be adhered together for transportation, which may cause material waste, product failure, and equipment damage. The task of double-page detection is to intelligently distinguish between two or more sheets, so as to take corresponding measures in advance to prevent double sheets from entering the process. 2. Principle of double-sensor detection: The principle is that when the “emitter” generates a magnetic field, the “receiver” will detect a magnetic field signal. Since the general metal has an electromagnetic field induction, the magnetic field signal becomes weak when the magnetic field passes through the metal, and the strength of the magnetic field weakening is evaluated by the host. The electromagnetic field is highly penetrative and sensitive to the thickness of the metal object. If two or more pieces of metal are stacked together, the strength of the magnetic field signal changes. The host will automatically compare with the intensity of the single weak signal to judge this. Whether the signal is double or multiple signals. Since the metal induced magnetic field is determined by its own properties, it is not subject to external vibration and other factors, so the magnetic field detection is very stable. 3. Application of double sheet detection: Widely used in metal packaging industry, home appliance production industry, hardware parts stamping industry, automobile production industry, circuit board production industry, etc. Among them, tin cans are the most widely used in metal packaging. 4. Importance of installing double-sheet inspection: 1 Guarantee production efficiency: For example, our printing tinplate companies know that there is a protective oil layer on the surface of the tinplate. It is likely that there will be double or more feeds in the feeding frame before the printing or coating. The overlap of Zhangmakou iron pieces will cause the overprinting to be inaccurate, the card machine will destroy the elasticity of the rubber cloth. In order to ensure smooth production, this safety function detection is indispensable at this time, that is, the detection and control of double overlap. 2 saving manpower: in some companies that cover, the double cover overlaps in the stamping process, or the double-cover overlap occurs in the rolling circle. This cover can of course not flow into the next link. The enterprises are manually selected to check out one by one, so that it is necessary to increase the amount of work and there will be leakage, of course, it is also installed electronic automatic double-cover overlap detection to timely and effective control, using automation instead of manual operation to save Part of human resources. 3 Avoid material waste: Material waste is a problem in every enterprise's production, because the material waste caused by the double or double cover overlap also takes up a large share, so the double detection controller is installed. It can avoid unnecessary material waste loss. 4 Protect expensive molds and equipment: The mold is a costly accessory in mechanical equipment. A set of molds often ranges from tens of thousands to hundreds of thousands, and the presses have double overlap. Stamping, it is easy to cause damage to the mold, so the installation of double sheet inspection can control the double metal sheet to continue stamping before stamping to avoid damage to the mold. 5 Guarantee product quality: Product quality is the eternal theme of the enterprise, quality is efficiency, and quality is the life of the enterprise. Any company must put its own product quality to the right, the entire canning process, from printing, cutting, can seam welding stamping cover, to sealing cans, each production link is related to the quality of the finished product.

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