| 摘要 |
A multiple nut runner comprises a frame in which a number of coaxial nut runners are rotatably mounted. Each nut runner has an arm on the housing and a pneumatic cylinder coupled between the arm and the frame so as to transmit the reaction torque to the frame. The cylinder is built together with a control valve that shuts off the motive air to the pneumatic motor of the nut runner in response to the cylinder giving away at a pre-determined torque. The cylinders and the motors as well, are connected to a common adjustable pressure regulator.
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