Lathe tool rest deflection shaft locking device

The utility model relates to a locking device for a deflection shaft of a lathe tool rest. According to the technical scheme, the device comprises a rotating shaft, a locking plate, a locking head, aninner cushion layer, a buckle head, a hydraulic cylinder, a fixing plate, a first hydraulic oil pipeline, a second hydraulic oil pipeline and a pressure sensor. According to the utility model, the hydraulic cylinder is used as a power source to drive the locking head; the locking is realized by means of friction force with the locking plate; the used inner cushion layer is convenient to disassemble and replace; the friction braking effect is good; no mechanical damage is caused to the rotating shaft; in addition, the pressure between the locking head and the locking plate can be detected in real time through the installed pressure sensor, the pressure is guaranteed through the action of the hydraulic cylinder, so that enough friction force is guaranteed to stabilize the rotating shaft, locking loosening is effect