| 摘要 |
A powder charged rock cracker cartridge (1) comprises asubstantially cylindrical outer sleeve (2) with an end wall in a first end (3); a plug (4) which, enclosing said outer sleeve, is inserted into and is secured in an opposite second end of the outer sleeve; a main chamber (5) in the outer sleeve (2) between said end wall and said plug, which main chamber is filled with a blasting powder charge (6); a substantially cylindrical inner sleeve (7), which is coaxial with the outer sleeve (2), is connected to said plug, and extends into the charge of blasting powder in the main chamber; and a central through hole (8) in said plug which communicates with the inner sleeve, which is closed in its inner end, which is inserted into the blasting powder charge. The hole in the plug and the inner sleeve in combination form a priming chamber (9) having a shape corresponding to the outer shape of a detonator (10), which can be trigged electrically and comprises an igniting powder charge. The inner sleeve has an inner wall (13) consisting of a plastic material. The thickness of the plastic wall and plastic material are selected such that the plastic wall in less than 25 ms (milliseconds) is penetrated by the pressure and the flame of fire which are formed when the detonator is ignited, thereby igniting the blasting powder charge.
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