For 3C electronics manufacturing workshops, production lines are typically laid out in compact spaces with limited room. Therefore, automating upgrades without altering existing layouts is a common requirement for manufacturers. When advancing factory automation upgrades through “intelligent transformation and digital transition,” the automation engineering department must consider how to rapidly deploy automated equipment while minimizing downtime and making minimal changes to existing layouts. Screw fastening is a critical step in 3C electronics assembly lines. On existing production lines, limited space necessitates human-robot collaboration across multiple processes. Consequently, traditional industrial robots requiring safety fencing cannot meet the automation retrofit requirements.