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There are three main methods used for component positioning and nozzle alignment in automated assembly systems:
1) Mechanical alignment adjustment: This method involves physical adjustments of the nozzle position and rotation. It offers limited precision and is rarely used in modern systems due to its lack of flexibility and accuracy.
2) Laser recognition: This system uses a laser to detect the X/Y coordinates of components and adjusts the nozzle accordingly. It allows for real-time identification during the placement process, but it is not suitable for ball grid array (BGA) components due to their complex structure and small size.
3) Camera-based recognition: This method utilizes a fixed camera that captures images of components as the pick-and-place head moves across the field of view. While slightly slower than laser recognition, it can identify any type of component, including BGAs. However, implementing a camera system that works in real-time requires more complex mechanical design and additional hardware integration. Despite this, it remains the most versatile and widely used approach in modern high-precision assembly lines.
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