Rear roller synchronization and movement detection device for ring spinning frame

The invention relates to a rear roller synchronization and movement detection device for a ring spinning frame. The device comprises a detection wheel combination, a detection sensor combination and alogic operation PLC program, wherein the detection wheel combination is arranged on a rear roller base shaft; the detection sensor combination located on one side of the detection wheel combination is arranged on a cradle support rod; and the detection sensor combination is connected with the logic operation PLC program. According to the device, the quality of spinning is improved, faults can betimely discovered and solved when occurring, and the production efficiency is improved. Rollers rotate to drive the detection wheel combination to rotate and match with a proximity switch sensor on the corresponding detection sensor combination to generate an on-and-off electrical signal; after the signal is processed by the PLC program, whether any one rear roller is moved axially due to loosening of a connection thread o