Abstract: An internal detection system of stress concentration of an oil and gas pipeline based on unsaturated orthogonally magnetization is provided. The system comprises a detection device and a processing device; the detection device comprises a detection probe; the detection probe comprises a magnetizing device and a magnetic signal acquisition device; the magnetizing device is fixedly connected with the magnetic signal acquisition device; the magnetizing device is configured to magnetize a pipeline to be detected, so that the pipeline generates a magnetized magnetic field; the magnetic signal acquisition device is configured to acquire a magnetic signal of the magnetized magnetic field to obtain an acquired signal and send the acquired signal to the processing device; the processing device is configured to receive the acquired signal and obtain a stress concentration area of the pipeline based on the acquired signal.

Abstract: A rotating shaft configured to connect two screen-brackets includes two axle structures arranged symmetrically. One of the two axle structures includes an axle, a motion conversion structure, a screen bracket connection structure, and a supporting bracket. The axle includes a worm groove at a surface of the axle. The motion conversion structure cooperates with the worm groove to form a worm drive. The screen bracket connection structure is movably connected to the motion conversion structure and includes mounting holes, which are configured to mount the screen-brackets. The supporting bracket is sleeved at the axle, rotates around an axis of the axle, and is movably connected to the motion conversion structure and the screen bracket connection structure. The motion conversion structure is movable along an axis direction of the axle on a first surface relative to the supporting bracket.

Abstract: A rotating shaft configured to connect two screen-brackets includes two axle structures arranged symmetrically. One of the two axle structures includes an axle, a motion conversion structure, a screen bracket connection structure, and a supporting bracket. The axle includes a worm groove at a surface of the axle. The motion conversion structure cooperates with the worm groove to form a worm drive. The screen bracket connection structure is movably connected to the motion conversion structure and includes mounting holes, which are configured to mount the screen-brackets. The supporting bracket is sleeved at the axle, rotates around an axis of the axle, and is movably connected to the motion conversion structure and the screen bracket connection structure. The motion conversion structure is movable along an axis direction of the axle on a first surface relative to the supporting bracket.