3 results about "Fire accident" patented technology

The invention relates to the field of block chains, and discloses a fire-fighting monitoring method based on a block chain, and the method comprises a fire-fighting accident confirmation process, andthe fire-fighting accident confirmation process comprises the following steps: A1) a sensor detecting an abnormality, initiating an alarm, transmitting the alarm to the block chain, enabling a block chain center to initiate broadcasting, and notifying the block chain of the change; A2) carrying out analysis and alarming after receiving the broadcast by related on-duty programs or on-duty personnel; A3) judging whether an alarm is given out or not according to the specific situation, and if so, executing the step A4); otherwise, executing the step A5); A4) starting a fire accident emergency rescue process, and executing the step A6); A5) setting an alarm as a false alarm, setting the alarm on the block chain, executing the step A6); and A6) ending the process. The fire-fighting monitoring method based on the block chain has the following beneficial effects that distributed storage is realized, data is safer, records cannot be changed, falsification is avoided, data is public, the massescan execute supervision rights, and the automation degree is high.

The invention discloses a safety protection device for a laser automatic unpacking machine. The device comprises a switch connecting sleeve and a switch pedestal, wherein the switch pedestal is cylindrical and one end of the switch pedestal is provided with an end cover; the switch connecting sleeve is arranged in the switch pedestal and is connected with the end cover through a spring; a switch and a roller are fixedly arranged in the switch connecting sleeve; the roller is connected to the inner wall of the switch connecting sleeve through a shaft; the end face of the roller is provided with a plurality of through holes which are uniformly distributed along the circumference centered on the shaft; the through holes are aligned with a receiver on the switch; and when the spring is in a natural state, the roller extends out of the switch pedestal. In the invention, movement of a packing box on a conveying mechanism is converted into an electric signal, and data processing is performed through a PLC (Programmable Logic Controller) to control turn-on and turn-off of a laser device; laser is prevented from irradiating the same position on a sealing compound for a long time so as not to cause a fire accident; and compared with a rotary encoder, a photoelectric encoder has a simple structure and low cost.

The invention discloses a method and a system for detecting ground leakage current of a secondary-side long-distance cable of an alternating-current system, which establish a leakage current composite detection criterion after compensation of inherent residual current and inherent leakage current, and realize detection of asymmetric leakage current and three-phase leakage current of the secondary-side long-distance cable of the alternating-current system through judgment of a logic circuit. On-line monitoring of the insulation condition of the long cable is realized, whether the alternating-current system has hidden troubles is determined, and an alarm signal is emitted, so that grounding fault hidden troubles caused by abnormal insulation can be discovered timely, and fire accidents can be avoided effectively. The composite criterion of current detection is introduced, and the inherent residual current is compensated, so that the protection dead zone is greatly reduced, the electric leakage alarm constant value is further reduced, and the discrimination sensitivity is improved.