Xinshida Zhongweixing SCARA robots in glass loading and unloading applications in the 3C industry.
2025-07-25
Xinshida Zhongweixing SCARA robots in glass loading and unloading applications in the 3C industry.
Project Background
Zhongweixing provides a comprehensive, end-to-end automated loading and unloading solution for mobile phone glass processing. Specifically, in the screen-printing process stage, the SCARA robot equipped with an AVS vision system can capture multiple workpieces at once, enabling fast and accurate gripping and placing over a wide field of view, thereby significantly boosting production efficiency.
In automated production lines, vision systems are often used in the robot loading and unloading process to automatically locate workpieces. By accurately identifying the position of the workpieces, these systems prevent unnecessary damage caused by mechanical positioning, collisions between alignment devices and workpieces, or excessive squeezing. As a result, the complexity of mechanical positioning on the production line is simplified, positioning time is effectively reduced, and the efficiency and flexibility of robot loading and unloading operations are significantly improved.
Customer needs
● Fast beat requirement: Production capacity greater than 2,400 pieces/hour
● High gripping accuracy required, with a tolerance of ±0.2mm.
● The conveyor line must operate continuously without stopping, and during the following motion, it must reliably pick up items without any missed grabs.
● Frequent mold changes required: Compatibility with multiple colors and glass sizes is needed.
Xinshida Solution
Proposal Description
The glass cover on a mobile phone serves both to protect the touchscreen and enhance its aesthetic appeal. Screen printing is one of the processes used to manufacture it—this involves printing patterns or logos onto the surface—and afterward, the ink must be dried in an oven.
In this project, the glass pieces exiting the oven are conveyed by a conveyor belt in rows of five workpieces (approximately 15.5 inches long) toward the rear. During this process, they pass through the Zhongweixing AVS vision system, where cameras capture images to precisely locate each piece. Once the workpieces reach the robot’s gripping range, a SCARA robot immediately picks them up one by one. Afterward, the robot waits for an enabling signal from the PLC before finally placing the workpieces onto their designated positions.
Mobile phone glass components
HMI program interface
Scheme advantages
● Mature solution: Providing a complete robot and vision solution as a one-stop service;
● High efficiency: With a large field of view measuring 700mm x 470mm, it can pick up five pieces at a time, achieving a throughput of 2,500 pieces per hour.
● High stability: Effectively addresses issues of missed captures and multiple captures, with a yield rate of 99.99%.
● High calibration accuracy and fast speed: Calibration accuracy is 0.05 mm, with an overall accuracy of ±0.2 mm; calibration can be completed within 10 minutes.
● High compatibility: Compatible with various colors and sizes of glass;
● Easy maintenance: Switch to a new product in under 5 minutes.
Scheme Composition
Zhongweixing AR5215 SCARA + Zhongweixing AVS2300 Vision Positioning System.
For mobile phone glass that has undergone screen printing, the vision system employs blob analysis. In machine vision, a “blob” refers to a connected region in an image composed of pixels with similar characteristics such as color and texture. Simply put, blob analysis involves performing geometric analysis on a connected region to extract several important geometric features.
For this project, conventional positioning methods may suffer from missed detections and false detections. By incorporating blob analysis—through the extraction and screening of multiple key regions on the glass—visual positioning stability can be significantly improved.
Light Source Scheme
Associated products
AR5215B SCARA robot
Project Results
The Zhongwei Xing SCARA robot-based glass loading and unloading solution for the 3C industry has been successfully implemented in the screen-printing process. This solution integrates AVS vision technology with SCARA robots. With its wide field of view, the system can capture multiple glass workpieces in a single shot, while its advanced calibration algorithm ensures high-precision calibration over large areas. By employing dynamic tracking technology synchronized with the conveyor line, the system can quickly and accurately pick and place glass components without stopping the production line, thereby significantly boosting productivity.
