| 摘要 |
<p>The present invention relates to a device for clamping a workpiece of a machine tool that fixes the workpiece by means of one clamping device, thus reducing the size of a table, and fixes the center of the workpiece, thus stably clamping the workpiece. The device includes a rotary union supplying a hydraulic pressure, a connector disposed on the top of the rotary union and having a connector passage tube and a sensor hole, a table disposed on the top of the connector and having a table passage tube formed thereon in such a manner as to be connected to the connector passage tube, a bearing rotating the table, a housing whose lower portion inserted into the center of the table, a cylinder rod disposed inside the table and the housing and moving upward and downward by means of the hydraulic pressure supplied from the rotary union, a clamping cone whose lower end screw-coupled of the upper portion of the cylinder rod to be cooperatively operated with the cylinder rod, a clamp unit expanded and contracted in a circumferential direction by the clamping cone, a clamp holder whose lower portion inserted into the center of the housing and having a locking portion formed on the inner peripheral surface of the lower end portion thereof to be locked or unlocked by the clamp unit, a plate fixedly connected to the top of the clamp holder and adapted to mount the workpiece thereon, and a sensor adapted to sense the clamped or unclamped state by the sensor hole of the connector.</p> |
