Hydraulically or pneumatically operated clamping device for a machine tool has a pressure accumulator connected via a valve to a pressure line to ensure a workpiece is held clamped during an emergency shutdown of the machine tool

摘要

Pressure activated clamping cylinder for a machine tool clamping device has a cylinder chamber (2) of a cylinder housing, axial piston (4) and a distributor. The latter comprises a distributor housing with pressurizing medium connections (6) and a distributor shaft for supplying medium to the cylinder chamber (2) via a pressure line (9). A pressure accumulator is (17) is connected to at least one of the pressure lines (9) by a valve (18) that opens when there is a pressure drop in the pressure line.