3 results about "Explosive blast" patented technology

An assembly (7) for triggering an explosive in a hole (9) to produce an explosive blast in the hole includes (a) an explosion trigger (15, 19) for triggering the explosive in the hole, (b) a detonation unit body (21) that is configured to be located at or proximate an open end of the hole in an initial position of the assembly in the hole and (c) a trigger cord (31) that is connected to the detonation unit body and to the explosion trigger.

This invention provides a method and system for co-initiating carbon dioxide phase change fracturing and electronic detonators. The method includes: dividing the tunnel face into an explosive blasting zone and a carbon dioxide phase change fracturing zone based on the vertical centerline; drilling conventional blast holes in the explosive blasting zone and fracturing holes and fracturing guide holes in the carbon dioxide phase change fracturing zone; installing electronic detonators in the conventional blast holes and carbon dioxide phase change fracturing devices in the fracturing holes; connecting the electronic detonators in the explosive blasting zone and the excitation heads of the carbon dioxide phase change fracturing devices in the carbon dioxide phase change fracturing zone to an initiation controller via the same bus; detonating the electronic detonators through the initiation controller, sequentially detonating the slotted holes, auxiliary holes, bottom holes, and peripheral holes, and triggering the carbon dioxide phase change fracturing device after the vibration damping interval. This invention greatly improves fracturing efficiency and fracturing device recovery rate, keeping the maximum single vibration experienced by the existing tunnel at an extremely low level.

This invention relates to the field of decorative stone mining technology, and more particularly to a high-efficiency, low-damage mining method for hard stone. The invention provides a high-efficiency, low-damage mining method for hard stone, comprising the following steps: dividing the hard stone mining area into zones and then drilling holes; sequentially applying microwave radiation excitation, high-pressure jet cutting, and carbon dioxide blasting to the hard rock mass in a predetermined fracturing direction. This mining method overcomes the problems of traditional rock explosive blasting, such as difficulty in controlling energy, high risk, large vibration effects, and significant damage to the internal structure of the stone, as well as the severe wear and low production efficiency of wire saws in hard stone mining, thus achieving high-efficiency, low-damage mining of hard stone.