Abstract: A tunnel operation robot includes a robot body, a walking module, a fixed wing module and a plurality of rotatable wing modules. Both sides of the robot body are provided with cantilever parts, which are collinearly arranged. The walking module is arranged on the robot body. The fixed wing module includes a fixed fan, is fixedly arranged on the robot body, and is configured to provide a pressure for the walking module to be attached to and pressed against the tunnel wall surface. The plurality of rotatable wing modules are respectively arranged on the cantilever parts on both sides of the robot body, and include a rotatable rotating fan and a wind direction adjustment driver. Each rotating fan has a rotation axis parallel to the cantilever parts and an air outlet direction perpendicular to the cantilever parts, and the wind direction adjustment driver is connected to the rotating fan.

Abstract: An AR-based supplementary teaching system for guzheng and method thereof, the system includes an AR device, a data processing device and positioning devices for key positions, the data processing device is signal-connected to the AR device, and the positioning devices is installed on the guzheng code of guzheng, the positioning devices corresponds to the guzheng code of guzheng one by one; the AR device is used to obtain real scene data; the data processing device is used to guzheng and the positioning devices identify and generate string distribution data; also used to obtain operation instruction based on user actions, execute the operation instruction and generate virtual data; the AR device is also used to convert all data based on the string distribution data The virtual data and the real scene data are superimposed and displayed.

Abstract: The present invention discloses a toothbrush head and an electric toothbrush, wherein the toothbrush head is connected to the drive shaft of the toothbrush handle, and comprises a toothbrush head and a clamping piece. The toothbrush head comprises a brush end and a connecting end that are opposite to each other. The clamping piece is installed on the connecting end, and provided with an elastic arm and a clamping slot for clamping the drive shaft. One end of the elastic arm close to the brush end is a free end, and some part of the sidewall of the clamping slot is formed by the elastic arm. The elastic arm is further provided with a butting boss. The butting boss protrudes from the elastic arm into the clamping slot, and can be elastically butted with the drive shaft. The toothbrush head provided by the prevent invention can solve the technical problem that the toothbrush head on some existing electric toothbrushes is difficult to detach from the toothbrush handle.

Abstract: An AR-based supplementary teaching system for guzheng and method thereof, the system includes an AR device, a data processing device and positioning devices for key positions, the data processing device is signal-connected to the AR device, and the positioning devices is installed on the guzheng code of guzheng, the positioning devices corresponds to the guzheng code of guzheng one by one; the AR device is used to obtain real scene data; the data processing device is used to guzheng and the positioning devices identify and generate string distribution data; also used to obtain operation instruction based on user actions, execute the operation instruction and generate virtual data; the AR device is also used to convert all data based on the string distribution data The virtual data and the real scene data are superimposed and displayed.