Patents by Inventor Zhichen LI

Zhichen LI has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220265076
    Abstract: An opening and closing device for curtains and a system based on the same, mounted on a curtain track, comprises a main engine and a roller mechanism, The main engine comprises a shell with a cavity, a driving wheel mounted in the cavity and partially exposed the shell, a motor arranged in the cavity and controlling the driving wheel to rotate, a controller lied in the cavity and controlling the motor to start and stop, and a signal transceiver module coupled electrically with the controller and receiving starting and stopping signals of the motor; the driving wheel is used for driving the curtains to move along the curtain track; a roller mechanism is mounted on the shell, an end, far away from the shell, of the roller mechanism is hung on the curtain track and presses the driving wheel closely on the curtain track.
    Type: Application
    Filed: October 12, 2019
    Publication date: August 25, 2022
    Inventors: Wei Hou, Zhichen Li, Yang Pan, Guohui Liu, Chao Ma, Changhai Liao
  • Publication number: 20220047107
    Abstract: An opening and closing device for a curtain mounted on a guiding part, the guiding part is provided with the curtain; the opening and closing device is used for driving automatic opening and closing of the curtain; the opening and closing device includes a mainframe and a connecting mechanism. The mainframe includes a shell, a driver and a driving wheel; the driving wheel and the driver are mounted in the shell, the driver drive the driving wheel to rotate. The connecting mechanism includes a hanging piece and a bracket; a first end of the bracket is inserted into the shell, the hanging piece is movably connected with a second end of the bracket and hung on the guiding part; the hanging piece can be moved vertically relative to the bracket so that the driving wheel is attached closely to the outer wall of the guiding part.
    Type: Application
    Filed: March 31, 2021
    Publication date: February 17, 2022
    Inventors: Zhichen Li, Wei Hou, Yang Pan, Haobo Zhang, Chao Ma
  • Patent number: 10365126
    Abstract: A distributed optical fiber disturbance positioning system based on the asymmetric dual Mach-Zehnder interference, unlike traditional dual Mach-Zehnder distributed optical fiber disturbance sensing system, the present invention adopts two narrow-bandwidth optical sources (1a, 1b) and adopts corresponding DWDM (3a, 3b) before the detector (4a, 4b) to filter the backscatter noise of the optical fiber, and can solve the problems of having too low SNR due to backscatter influence when the sensing distance is long. The present invention also provides a positioning method for applying the system, which obtains the TFD of the disturbance frame signals by using the time-frequency analysis method based on the short-term average frequency, and takes the points near the point of maximum frequency as the effective signal segment for performing cross-correlation time delay estimation, thus obtaining the delay, and the disturbance position.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: July 30, 2019
    Assignee: Tianjin University
    Inventors: Kun Liu, Tiegen Liu, Junfeng Jiang, Chunyu Ma, Tianjiao Chai, Chang He, Miao Tian, Zhichen Li
  • Publication number: 20180292240
    Abstract: A distributed optical fiber disturbance positioning system based on the asymmetric dual Mach-Zehnder interference, unlike traditional dual Mach-Zehnder distributed optical fiber disturbance sensing system, the present invention adopts two narrow-bandwidth optical sources (1a, 1b) and adopts corresponding DWDM (3a, 3b) before the detector (4a, 4b) to filter the backscatter noise of the optical fiber, and can solve the problems of having too low SNR due to backscatter influence when the sensing distance is long. The present invention also provides a positioning method for applying the system, which obtains the TFD of the disturbance frame signals by using the time-frequency analysis method based on the short-term average frequency, and takes the points near the point of maximum frequency as the effective signal segment for performing cross-correlation time delay estimation, thus obtaining the delay, and the disturbance position.
    Type: Application
    Filed: October 27, 2016
    Publication date: October 11, 2018
    Applicant: Tianjin University
    Inventors: Kun LIU, Tiegen LIU, Junfeng JIANG, Chunyu MA, Tianjiao CHAI, Chang HE, Miao TIAN, Zhichen LI