Abstract: An illuminating device for machining tools is disclosed. A machining tool is installed with an illuminating device that uses a single LED prepared using the multi chip single module technique to provide high-power light. This elongates the lifetime of the illuminating device and has the advantages of power-saving and low temperature. The light thus produced does not have UV and IR components. In addition to no radiation injury to human bodies, the invention also avoids overlapped shadows in the case of multiple LED sources. Such a design of the cold and single light source can effectively bad influences on the precision of objects 31 being processed.

Abstract: An earth stratum flush monitoring method and a system thereof. Multiple transmitter units are embedded in the earth stratum at predetermined depth intervals. When the earth stratum is flushed, the respective transmitter units will be one by one flushed and displaced and shocked or rotated in accordance with the change of flush depth of the earth stratum. A shock sensor in each transmitter unit will sense this shock. The radio signal transmitters of the transmitter units will emit different encoded radio signals. A signal receiving apparatus disposed on the ground receives the signals and a computer reads the signals so as to monitor and know the real-time flush depth of the earth stratum. The detected real-time flush depth is then transmitted to an early warning unit for the early warning unit to read and judge and emit an alarm in time.