Regarding MCB arc chute assembly machines, why are semi-automatic machines more popular than fully automatic machines?

I. Why are semi-automatic applications more common? (Core reasons) Challenges of part physical characteristics: Arc extinguishing grid plates (Steel Fins) are usually very thin and have tiny burrs, making them prone to "sticking" or "stacking" during fully automatic handling. Side fiberboards are lightweight and easily deformed by moisture, resulting in extremely low tolerance for error during fully automatic robotic handling. Production changeover flexibility: MCBs of different current ratings (In) have different numbers and thicknesses of arc extinguishing grid plates (e.g., 9, 11, 13 pieces). Semi-automatic machines: Workers can complete production changeovers by simply replacing the jig. Fully automatic machines: Require complex vibratory feeder adjustments and software parameter modifications, resulting in extremely high debugging time costs. Initial investment return on investment (ROI): The arc extinguishing cover itself is of very low value; investing millions in a fully automatic line has a very long payback period, while semi-automatic machines are inexpensive and easy to maintain.

II. Semi-automatic vs. Fully automatic: Advantages comparison Characteristics Semi-automatic assembly machine Fully automatic assembly machine Operation mode Manual placement + machine pressing and forming Automatic vibratory feeder loading + automatic insertion + automatic pressing Main advantages High flexibility: adaptable to multiple models; strong fault tolerance: defective parts can be manually removed. Saves labor: one person can supervise multiple machines; extremely high consistency: eliminates human error. Lower equipment cost, low maintenance cost. Extremely high, requires professional engineers to maintain vibratory feeders and sensors. Smaller space occupation, can be flexibly distributed in the workshop. Larger, usually requires coordination with a rectification line. 

III. Misconceptions about Capacity Conclusion: Single-machine efficiency is higher for fully automatic machines, but system throughput is often more stable for semi-automatic machines. Theoretical capacity: Fully automatic machines are indeed higher. If running stably, a fully automatic machine can reach 1200 - 1500 pcs/hour. Actual effective capacity: Fully automatic machines: Once a grid plate jams, the entire line will stop and wait for repair, and the actual utilization rate (OEE) may only be 70%. Semi-automatic machines: The single-machine capacity of a skilled worker is approximately 600 - 800 pcs/hour. However, its advantage lies in its stability, and manufacturers typically arrange multiple units side-by-side (such as your 8-station workbench design). The effect of parallel operation with multiple machines is that the total output of three semi-automatic machines often exceeds that of one fully automatic machine, and the total cost may be lower, with the risk being more diversified.