Principle and application of double sensor - Solutions - Huaqiang

Photocoupler

1. During the automatic feeding process, it's common for multiple sheets of material to stick together due to various factors, which can lead to material waste, product defects, and even equipment damage. The purpose of double-sheet detection is to accurately identify when two or more sheets are fed at once, allowing for preventive measures to be taken before they enter the production line. 2. How double-sheet sensors work: The system relies on an emitter that generates a magnetic field, which is then detected by a receiver. Since metal objects can interfere with this field, the strength of the signal weakens when passing through them. The control unit evaluates this weakening and compares it to a single-sheet signal to determine if there’s a double or multiple sheets present. This method is highly sensitive to the thickness of the metal and remains stable regardless of external vibrations or other disturbances. 3. Applications of double-sheet detection: This technology is widely used in industries such as metal packaging, home appliance manufacturing, hardware stamping, automotive production, and circuit board fabrication. Among these, tin cans are one of the most common applications in the metal packaging sector. 4. Why installing double-sheet detection is important: - **Ensuring production efficiency:** In printing companies that handle tinplate, a protective oil layer can cause multiple sheets to feed together before printing or coating. This can lead to misalignment, damage to rubber belts, and production halts. Installing detection systems helps prevent such issues. - **Reducing labor costs:** In some industries, double sheets may occur during stamping or rolling processes. Without automation, workers have to manually check each sheet, increasing workload and the risk of errors. Automated detection systems streamline this process. - **Minimizing material waste:** Double feeding often results in wasted materials, which can be costly. A detection system prevents this by stopping the process when multiple sheets are detected. - **Protecting expensive molds and equipment:** Molds are costly components in machinery. If multiple sheets are stamped together, it can easily damage the mold. Detection ensures only single sheets are processed, reducing the risk of costly repairs. - **Improving product quality:** Quality is essential for any business. From printing to sealing, every stage of the production process must be precise. Double-sheet detection plays a key role in maintaining consistent quality across all stages.