30results about How to "Solve the problem of intrusion" patented technology

The invention discloses a portable electronic device, which provides an electronic device capable of being connected to a storage medium through the portable electronic device. The portable electronicdevice comprises a first transmission interface, a second transmission interface and a selection interface. The first transmission interface is used to be electrically inserted into by the storage medium so as to build data which is transmitted on the portable electronic device; the second transmission interface is used for the electronic device to build data which is transmitted on the portableelectronic device; and the selection interface is operationally connected to the first and second transmission interfaces so as to switch the electronic device to write-only, read-only or read-write in the storage medium.

The invention provides a shunting turnout crushing prevention automatic control device which comprises a photosensor, a controller, a magnetic control parking device and a photovoltaic power supply which are arranged on an annunciator. When the photosensor senses that a turnout is in a locked state, a signal is output to the controller, the controller controls a strong magnet of the magnetic control parking device to move toward the direction close to steel rails, a forcedly operating locomotive is urgently vented and the automatic parking is implemented, so that the accident of crushing the turnout by the locomotive; and when the photosensor senses that the turnout is in a switching-on state, a signal is output to the controller and the controller controls the strong magnet of the magnetic control parking device to move toward the direction far away from the steel rails, so that the normal passing of the locomotive is not influenced. A locomotive automatic stop system matched with the shunting turnout crushing prevention automatic control device for use comprises a magnetic induction sensor, a locomotive monitoring device (LKj), a brake and the like which are arranged on the locomotive. The shunting turnout crushing prevention automatic control device and the locomotive automatic stop system have the advantages of effectively preventing the accident of crushing the turnout by the locomotive, which is caused by the misjudgment and the blind action of a driver and providing the reliable guarantee for the safety production.

The invention discloses an acoustic device, comprising: a sounding unit, the sound waves on the front side of the vibrating diaphragm radiate to the outside through the sound outlet; the rear side of the vibrating diaphragm forms a first airtight cavity, and the first airtight cavity A mounting hole is opened on the wall of the cavity, a flexible deformation part is provided on the mounting hole, a second closed cavity is provided outside the first closed cavity, and the flexible deformed part is arranged in the second closed cavity. The sound wave generated during deformation is sealed in the second airtight cavity; a protective cover plate located outside the flexible deformation part is also provided on the installation hole, and the protective cover plate and the flexible deformation part An avoidance space for avoiding the vibration of the flexible deformation part is formed between them; a plurality of air-permeable micro-holes are opened on the protective cover, and the area of ​​each air-permeable micro-hole is less than or equal to 0.2mm 2 . The acoustic device in the present invention can effectively reduce the resonance frequency, and greatly improve the low-frequency sensitivity of the product as a whole.

The invention relates to the technical field of ballast water long-distance discharge, in particular to a through type water ballast tank which comprises a water ballast tank body. The water ballast tank body is provided with a plurality of independent cabins. One end of each independent cabin is provided with a water inlet, and the other end of each independent cabin is provided with a water outlet. The top of each independent cabin is provided with a plurality of air ballast systems. A movable pressing plate is arranged in each independent cabin and is controlled by a mechanical lifting device to move. By means of the structural arrangement, a ship is through all the time through the water inlets and the water outlets in the sailing process, and the air ballast systems correspond to the movable pressing plates, so ballast water is discharged within the minimum safety range, seawater microorganisms or algae are prevented from being brought into an outer domain, the influences of external microorganisms are fundamentally eliminated, the problem of external microorganism invasion caused by ballast water long-distance discharge is greatly solved, the weight of the ballast water in the weight of the ship is reduced, ship loads are reduced, and the ship sailing efficiency is improved.