Abstract: In order to address the issue of insufficient torque caused by various factors during bolt disassembly and fastening operations of scraper chain disassembly and assembly equipment, based on the existing mechanical structure of scraper chain disassembly and assembly equipment, and according to the characteristics of servo motor closed-loop control, a set of hardware devices with servo motor as the core is designed and selected by using the modern mechanical automation design methods. A servo motor control system based on MCGS and PLC is designed to ensure the continuity and reliability of bolt disassembly and tightening process. The results show that the device effectively solves the problem of insufficient tightening torque in the bolt disassembly and fastening process of the scraper chain disassembly and assembly equipment, which increases the one-time success rate of tightening the bolts on the scraper chain after assembly by about 50%, and ensures the product quality.