Numeric control crankshaft grinder left-right headstock synchronous servo turning gear

The utility model relates to a left and right headstock synchronous servo rotation device of numerical control crankshaft grinding machine, which comprises a left and right headstock arranged on the planker of the numerical control crankshaft grinding machine. The device is characterized in that a first AC servo motor is arranged on the left headstock and drives the left chuck of the left headstock to rotate through a first belt transmission assembly; a second AC servo motor is arranged on the right headstock and drives the right chuck of the right headstock to rotate through a second belt transmission assembly; and the first and second AC servo motors are the same type and are controlled by the numerical control system of the crankshaft grinding machine. The utility model has the advantages that the device can keep the left and right headstocks of the crankshaft grinding machine to rotate synchronously, overcome the error caused by mechanical transmission, ensure the crankshaft accuracy after grinding, and improve the qualification rate.