EXPLOSION-PROOF SHIELD Russian patent published in 2007 - IPC F42D5/00 E21F17/103 

FIELD: technical physics, blasting operations, applicable at development of various protective structures designed for restriction of the blast destructive action, reduction of the blast load and protection from fragments on the end face walls of channels, as well as for localization of the explosion products containing harmful aerosols.

SUBSTANCE: the explosion-proof shield of the end face wall channel represent and obstacle separating the channel into the explosive space and the buffer space restricted by the end face wall with provision of communication of the explosive space with the buffer one. The obstacle is made composite at least of two components installed for longitudinal motion along the channels axis. Communication of the explosive space with the buffer one is provided due to the shift of the obstacle components relative to each other along the channel axis. An case when the explosion process is accompanied by formation of high-speed fragments, a gap may be absent in the projection to the cross-section of the channel between the obstacle components. The obstacle components in the explosion-proof device forming the protective shield may be made of destructible materials that can form of cloud of dispersed suspension at and influence of the blast load.

EFFECT: reduced level of destructive action of the explosion associated with the blast load on the channel end face walls due to the reduced amplitude of the blast load, in particular cases provided protection of the wall against high-speed fragments, as well as a reduced contamination area by harmful substances (dust, aerosols and gaseous products) in case of an accident.

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