Abstract: A method for judging the status of a mechanical system is provided. First, a vibration signal related to the mechanical system is provided. Subsequently, an empirical mode decomposition process is performed on the vibration signal, so as to generate a plurality of intrinsic mode functions. Plural target intrinsic mode functions are selected from the intrinsic mode functions. Based on the target intrinsic mode functions, the status of the mechanical system is judged.

Abstract: This invention is an installation of a safety apparatus to prevent safety problems of machine tools caused in work-loading process. The safety apparatus comprises an actuator, used for connecting circuits of the machine tool to control its power on-off status, and a storing unit to ensure the chuck wrench resting at a designated safe position. This safety system will activate the actuator when the chuck wrench is returned to the designated position and, therefore, it will keep the circuits of the machine tool stay active during the machining operation. On the other hand, this safety apparatus will remain in power-off status if the chuck wrench is not placed at the designated position and, therefore, it will make the power circuits open and paralyze the machine tool operation.

Abstract: This invention is an installation of a safety apparatus to prevent safety problems of machine tools caused in work-loading process. The safety apparatus comprises an actuator, used for connecting circuits of the machine tool to control its power on-off status, and a storing unit to ensure the chuck wrench resting at a designated safe position. This safety system will activate the actuator when the chuck wrench is returned to the designated position and, therefore, it will keep the circuits of the machine tool stay active during the machining operation. On the other hand, this safety apparatus will remain in power-off status if the chuck wrench is not placed at the designated position and, therefore, it will make the power circuits open and paralyze the machine tool operation.

Abstract: The present invention provides an adjustment device for adjusting the height of a washstand. The device utilizes a simple mechanism to allow a washstand, which fixed on a sliding beam, move up and down along a guiding track. The device also adjusts the height of the washstand as required by an actuating device. The adjustment device comprises a base, a sliding device, a sliding beam, and an actuating device. The sliding device is fixed on the base. The sliding beam connects to the sliding device in a way of moving up and down. The washstand is fixed on the sliding beam so that the washstand can move up and down. The actuating device provides necessary potential energy for lifting the washstand. Thereby the washstand fixed on the sliding beam can move up and down with the sliding device and the height, to which the washstand moves, is adjusted by the actuating device.