| 摘要 |
The device monitors the function of, and the shut-down of, the air bearing-slide conveyor of a precision machine tool, like a PCB-boring machine. Each bearing body comprises a flat bearing surface with several air outlets formed in the surface in the region of its centre. There are also pressure-monitoring devices connected to the body. These devices are connected via a measuring cable and a hole in the bearing body ending in an opening in the bearing surface to the airgap between the surface and the base plate. They react upon the actual pressure present there. The monitoring devices of all bearings are connected in a series circuit with the control unit of the machine as well as with an acoustic and optical warning device, plus a relay for shutting down the machine as soon as a bearing fails. |
