Abstract: A reasonable millisecond time control method for excavation blasting of a tunnel is provided, and includes: acquiring physical mechanical parameters to establish a millisecond blasting model, and designing four dimensions blasting parameters of explosive quantity, hole number, inter-hole millisecond and inter-row millisecond; simulating, based on the millisecond blasting model, a blasting process of an explosive package using blasting parameters to obtain a blasting vibration curve; obtaining single-hole blasting vibration waveforms, solving a vibration synthesis curve through a vibration synthesis theory; comparing the vibration synthesis curve with the blasting vibration curve to obtain a coupling relationship of blasting parameters; determining a target group of explosive quantity and hole numbers, determining a target millisecond through the coupling relationship of blasting parameters, and relating a millisecond blasting control strategy to control, and it is used for tunneling project to reduce cut blas

Abstract: An itch relieving device is disclosed, including a shell, a heating element, a first touch sensing module, a control module and a gear input module. The first touch sensing module is configured for touching a human body to generate a human body sensing signal, the control module is electrically connected with the heating element to control the heating element to be switched on or off according to the human body sensing signal, the gear input module is configured for acquiring a control action to generate a pulse signal, the control module is provided with a storage unit, the control module is electrically connected with the gear input module to change a heating gear according to the pulse signal, the control module records the current heating gear through the storage unit, and the control module controls a heating power of the heating element according to the current heating gear.