34results about How to "Solve security protection" patented technology

The invention discloses a method, a device and a system for safety protection used in failure of putting away an oar of a blade of a wind turbine generator. The method comprises the following steps: collecting and computing a real-time rotating speed of a blade hub; after a safety chain system sends a stopping command, if the rotating speed of the blade hub is continuously increased, judging a pitch control system to have a fault of putting away the oar; computing a yaw angle command; sending the computed yaw angle command to a master control PLC (Programmable Logic Controller), and controlling a yaw system to carry out a yaw action through the master control PLC. The system comprises a rotating speed computing module, a pitch control fault judging module and a yaw command computing module. The device comprises a safety protection controller internally provided with the system and connected with the safety chain system and the master control PLC; a rotating sensor used for collecting the real-time rotating speed of the blade hub; and a rotating speed processing circuit connected with the rotating speed sensor and the safety protection controller. According to the invention, the overspeed risk of the wind turbine in a stopping process is reduced, and the safety of the wind turbine and the reliability of judgment of the pitch control fault are improved.

The invention discloses a steel wire rope brake. A movable brake plate is matched with a connecting arm in a rotating manner, wherein the other end of the connecting arm is matched with a sliding shaft in the rotating manner; the two ends of the sliding shaft are arranged in the cam surfaces of two side plates respectively; a fixed brake plate is provided with a locking hook frame which is provided with a locking hook capable of locking the sliding shaft; electromagnets are arranged on the two sides of an electromagnet seat respectively; a guide pillar is fixedly connected to the upper end of an impact rod after movably penetrating through the electromagnet seat; the impact rod movably penetrates through the electromagnet seat; the lower section of the impact rod is sleeved with a spring; the lower end of the impact rod is opposite to the swinging end of the locking hook; a pressure block is arranged on the impact rod, and is positioned in the electromagnet seat; inclined surfaces are formed on the two sides of the pressure block; two support rods are arranged in the electromagnet seat, and form upwards inclined surfaces; the lower ends of the support rods are arranged on the electromagnet seat in the rotating manner; the support rods can be pressed by the electromagnets; the sliding shaft is provided with an upper spring seat; a spring support shaft is arranged between the two side plates, and is provided with a lower spring seat; an energy storage part is arranged between the upper and lower spring seats; an impact triggering mechanism can be reset by a resetting mechanism.

The invention provides a device and method for winding or unwinding a cuff. The device for winding or unwinding the cuff comprises a winding mechanism, the cuff attached to the inner portion of the winding mechanism and a control part used for controlling the winding mechanism to carry out winding or unwinding. The device is characterized in that the winding mechanism is made to carry out winding or unwinding in a barrel shape through the control part to wind or unwind the cuff in the winding mechanism, so that the cross section area of the winding mechanism is changed.

The invention discloses a preparation method of a microsphere for detonation of blasting in an oil field layer. The method comprises the following steps of: evenly mixing raw materials to obtain powder; then adding a collodion acetone solution in partial powder, stirring and agglomerating, and then carrying out forced screening to obtain a qualified product; subsequently, placing the qualified product in a sugar-coating machine, spraying a lac ethanol solution, scattering the powder so that the qualified product rounds as a ball and is enlarged, and screening to obtain a semi-finished product; placing the semi-finished product in the sugar-coating machine, spraying the collodion acetone solution, scattering the powder so that the semi-finished product rounds as a ball and is enlarged, andscreening to obtain a qualified semi-finished product; and placing the qualified semi-finished product in the sugar-coating machine for primary cladding and cladding, and drying to obtain the microsphere with the particle size of 1mm-3mm. The microsphere prepared by the method of the invention is easily transported in the rock seam at the bottom of an oil well; the detonation blasting effect of the microsphere is good, and the success rate of the ignition reaches 100%, thereby effectively improving the oil-production efficiency of the oil field; and the microsphere is safe and reliable and has low cost.

The present invention provides an Android file password box system based on double chaotic hash file control. Quick browse, add, modify, delete, backup and rebuild operations of encrypted files in the external storage; when the user exits, the content of the fast table is written back to the data structure file. The invention fully considers the user's mobile phone configuration and personal security requirements, avoids mandatory occupation of the user's storage space, and the user can flexibly set different file security protection levels. According to the characteristics of the Android system, this system designs a new data structure file to realize the control of the file, avoids the trouble of users setting different passwords for encrypting multiple files, and provides the function of protecting copyright files; and the system reconstruction function avoids illegal users. The attack greatly improves security and runs faster.

The invention relates to the technical field of information security, discloses a private key processing method based on an SM2 algorithm, a terminal and a key center, and solves the security protection problem of a private key in an open environment in the prior art. The method is applied to a key center, and the method includes: receiving a key request message from a client, where the key request message includes a key identifier and a first private key factor of the client; according to a key generation rule, obtaining the private key corresponding to the key identifier; obtaining a second private key factor according to the private key corresponding to the key identifier and the first private key factor; sending the second private key factor to the server, so that the server side encrypts and stores the second private key factor. The embodiment of the present invention is applicable to the process of decentralized storage and use of private keys in an open environment.