For single and double sheet detection, there are three ways to distinguish between one sheet and two sheets. The first method is to use a special single and double sheet detection sensor, the second method is to use a laser displacement sensor to measure the thickness of the item, and the third method is to use a weighing sensor. The following mainly shares with you the sensor solutions suitable for customers provided by Dongguan Zhonghao Automation Technology Co., Ltd. for customers' single and double sheet inspection.
In the process of using sensors to detect single and double sheets of PCB boards, the most effective and simplest method is to use single and double sheet detection sensors. However, when the single and double sheet detection sensors are used to detect, they will be easily affected by the material of the object being tested. As well as the influence of the thickness of the object to be measured, there will be some interference in the detection of some special materials. The main reason is that the single and double sheet detection sensor adopts the principle of ultrasonic detection. If the material of the object to be measured is different or too thick, the ultrasonic energy emitted by the single and double sheet detection sensor cannot penetrate. Secondly, there will be some holes for connecting circuits on the surface of the PCB board, some are large, some are small, and some are even long strips. If two or more PCB boards are stacked together, ultrasonic double detection When the sensor detects, it will penetrate through these holes, thus affecting the correct output of the detection results. There are various types of PCB boards, and it is not very practical to use ordinary ultrasonic single- and double-sheet sensors for detection. Therefore, for this special detection case, Dongguan Zhonghao customized a sensor solution for the customer that uses a weighing sensor to detect whether the PCB board is single or double.
Each PCB board has a certain weight. Using a load cell to detect the weight of the PCB board will not be affected by its own material. If the weight of one PCB board is 20g, then the mass of the two PCB boards is 40g. Accurately distinguish whether the PCB board is one or two PCB boards through the weight comparison, and then proceed to the next processing step, that is, use the weighing sensor to detect the single board. When double-photographing, external influences such as the material and shape of the object being measured can be ignored. Meet customer testing requirements.
Dongguan Zhonghao Automation Technology Co., Ltd. is a leading provider of industrial automation sensor products and an expert in sensor solutions. If you have any sensor problems, you can come to Zhonghao! The use of load cells to detect single and double sheets of PCB boards once again reflects Zhonghao's strong sensor solution capabilities and will provide customers with personalized sensor solutions that are most suitable for them.