47results about How to "Reduce the possibility of security incidents" patented technology

The invention belongs to an anchoring force monitoring method and device and relates to a real-time monitoring method and device of anchoring force of double-plate anchor bolt. The method comprises: welding five short columns between two plates, including a hollow column in the middle and four centrosymmetric solid columns around, and each column is axially and centrosymmetrically provided with four strain gauges, a Wheatstone full-bridge circuit is formed, and a strain gauge arrangement direction is along the axes of the columns. A current column surface strain value is acquired by a strain bridge circuit, and a controller computes anchor bolt anchoring force according to current axial strain values of the columns and controls a display instrument and an alarm to send out corresponding indicative signals; in the device, a double-plate structure, a strain bridge, an analog digital converter, the controller, the display instrument and the alarm are connected in order. The monitoring method and device is low in cost, simple and easy to use, easy to popularize and apply, capable of monitoring anchor bolt anchoring force accurately in real time, and capable of sending a warning in case that the anchoring force is insufficient or overloaded, effectively reducing the occurrence likelihood of coal mine safety accidents.

The invention relates to the technical field of an electric short-circuit protection device, in particular to a multifunctional fireproof short-circuit protector with a redundant device. The multifunctional fireproof short-circuit protector comprises a switch power supply, a current sampling device, a digital signal processor, a large-current power module, an isolation driving module, a redundant device, a charge absorption circuit and a load; the redundant device is a controlled mechanical switch, and an end L of an alternating-current power 220V is respectively connected with a resistor R1, the input end of the switch power supply, the input end of a differential amplifier and one end of the current sampling device. The multifunctional fireproof short-circuit protector is used in different alternating-current strong current fields such as household power, industrial power and the like, when the load is short-circuited, the abnormal power supply circuit is disconnected instantaneously at a microsecond speed, and no dangerous spark is produced on the short-circuit position; when the abnormal situation such as electric leakage happens in an electrical loop, the electric-leakage circuit is also disconnected at a high speed by the device; through the redundant device, even when the extreme situation that the large-power current module or the digital signal processor is abnormal occurs, the reliability of the device also can be guaranteed.

The invention belongs to the technical field of solid rocket motors, and relates to an igniter of an electromagnetic mechanical insurance type solid rocket motor; in the invention, a set of electromagnetic mechanical insurance is placed in the gas fire transmission channel between the ignition tube and the ignition cartridge in the igniter, The opening and closing of the gas fire transmission channel is controlled by the electric signal control electromagnetic mechanical insurance, which not only realizes the safety control ignition control of the igniter, but also ensures that once the ignition system ignites by mistake, it will not cause the entire ignition device to ignite, which greatly improves the safety factor. , reduce the possibility of safety accidents, and further realize the electrification control of the mechanical safety device, which is safer and more convenient.