The invention discloses a tool unclamping device using a
ball screw for transmission. The tool unclamping device comprises a cylinder body and a
piston rod, the cylinder body is provided with a
front cover and a rear cover, a lead screw is arranged in the cylinder body, the lead screw is connected with a lead screw nut in a sleeving mode, the lead screw is connected with a driving mechanism for driving the lead screw to rotate, a containing cavity for containing the other end of the lead screw is formed in the
piston rod, the
piston rod is connected with the lead screw nut through a piston, a guide rod penetrates through the piston, the
front cover is connected with a pressurizing cylinder, the pressurizing cylinder is provided with a pressurizing cylinder end cover, a connector opening is formed in the side wall of the pressurizing cylinder end cover, the
piston rod can penetrate through the
front cover to enter into the pressurizing cylinder, and an oil cavity is formed from the front end of the
piston rod to the connector opening. According to the device, thrust is generated through spiral movement of the lead screw and the lead screw nut to achieve movement of the
piston rod, the lead screw and the lead screw nut are good in transmission stability, high in precision and free of creeping, the whole unclamping device operates stably, the operation stability of an execution element is guaranteed, the unclamping device is free of
noise pollution, suitable for occasions with high precision requirements and suitable for popularization and application, and the device is especially suitable for
machining centers.