Method and apparatus for providing a primer with a detonator in a borehole

Abstract

The invention concerns an apparatus adapted to take up a primer ( 3 ) with a detonator ( 7 ) and intended to be provided in a borehole by means of a charging hose ( 21 ) for the filling of the explosives in the hole. The invention includes a cartridge shaped plug ( 1 ) adapted to be inserted in the outlet of the charging hose ( 21 ) and to releasably be held in the charging hose ( 21 ), and to be released from this when the explosives are led out of the charging hose ( 21 ). A method for the charging of holes and the charging device for the described apparatus is also included.

1 - 11 . (canceled)  
   
   
       12 . An apparatus (A) adapted to take up a primer ( 3 ) with a detonator ( 7 ) and adapted to be provided in a borehole by means of a charging hose ( 21 ) for the filling of explosives in the hole, 
 characterized in that it comprises a cartridge shaped plug ( 1 ) adapted to be pushed into the outlet of the charging hose ( 21 ) and to releasable be held in the charging hose ( 21 ) and to be released from this when the explosives are led out of the charging hose ( 21 ) and that the cartridge shaped body ( 1 ) comprises an outside flange ( 4 ).    
   
   
       13 . The apparatus according to  claim 12 , 
 characterized in that the apparatus (A) comprises one or several guiding and friction organs ( 2 ) situated on the outside diameter of the cartridge shaped body ( 1 ) of the apparatus (A).    
   
   
       14 . The apparatus according to  claim 12 , 
 characterized in that the outside flange ( 4 ) is adapted to be held by the apparatus (A) in a charging device.    
   
   
       15 . The apparatus according to  claim 12 , 
 characterized in that it comprises seals ( 8 ) for sealing between the apparatus (A) and a transport channel ( 14 ), such that it can be conveyed pneumatically to a position ahead of the charging hose ( 21 ).    
   
   
       16 . The apparatus according to  claim 12 , 
 characterized in that it is formed with a length greater than what is necessary for placing a predetermined amount of primer, such that it protects the detonator ( 7 ) to be inserted in the apparatus (A).    
   
   
       17 . A charging device for charging the apparatus (A) according to  claim 12  and bulk explosives in holes, where the charging device comprises a feeding unit for feeding a charging hose ( 21 ), a guiding tube ( 15 ) for guiding the charging hose ( 21 ), and a transport channel ( 14 ) for inserting the apparatus (A), a branch pipe comprising of substantially straight sections, and an inlet section and an outlet section ( 16 ,  18 ) respectively, in connection with a deviated section ( 17 ) letting the two sections ( 16 ,  18 ) form an angle in relation to each other, 
 characterized in that the charging device furthermore comprises a stopping device ( 19 ) adapted to hold the apparatus (A) in the outlet section ( 18 ) of the branch pipe until the charging hose ( 21 ) is led on the outside of the apparatus (A), the stopping device ( 19 ) being adapted to impinge the flange ( 4 ) of the apparatus (A).    
   
   
       18 . The charging device according to  claim 15 , 
 characterized in that the stopping device ( 19 ) comprises means releasing the apparatus (A) when this is sufficiently placed in the outlet of the charging hose ( 21 ).    
   
   
       19 . A method for providing a primer ( 3 ) with detonator ( 7 ) in a hole to be blasted by means of an apparatus adapted to take up primer ( 3 ) with detonator ( 7 ) and intended to be provided in a borehole by means of a charging hose ( 21 ) for the filling of bulk explosives in the hole, 
 characterized in that the primer ( 3 ) and detonator ( 7 ) is inserted in a cartridge shaped plug ( 1 ), that the plug ( 1 ) is inserted into the outlet of the charging hose ( 21 ) and is releasably secured in this during the insertion of the charging hose ( 21 ) in the hole, and that the plug ( 1 ) is released from the charging hose ( 21 ) by the bulk explosives when this is led out of the charging hose.    
   
   
       20 . The method according to  claim 19  with a charging unit comprising a feeding unit, a branch pipe with an inlet section and an outlet section ( 16 ,  18 ) connected with a deviated section ( 17 ), a transport channel ( 14 ), a guiding tube ( 15 ), and a charging hose ( 21 ), where the feeding unit is adapted to convey the charging hose ( 21 ) through the guiding tube ( 15 ) and into the outlet section ( 18 ) of the branch pipe, 
 characterized in the following steps:    insertion of the charging hose ( 21 ) in the guiding tube ( 15 ) with the feeding unit such that one end of the charging hose ( 21 ) is placed in the guiding tube ( 15 ), insertion of the apparatus (A) into the transport channel ( 14 ),    conveying the apparatus (A) through the transport channel ( 14 ) into the branch pipe ( 16 ,  17 ,  18 ) until it reaches a stopping device ( 19 ) placed in the outlet section ( 18 ) of the branch pipe, feeding of the charging hose ( 21 ) such that the charging hose ( 21 ) is led on the outside of the apparatus (A),    and releasing the stopping device ( 19 ) such that the charging hose ( 21 ) with the apparatus (A) can be led out of the outlet section ( 18 ) of the branch pipe.    
   
   
       21 . The method according to  claim 19 , 
 characterized in that it further comprises:    feeding the charging hose ( 21 ) into a borehole to a place where a bulk explosive shall be placed;    pumping the bulk explosives such that it presses the apparatus (A) out of the charging hose ( 21 ).    
   
   
       22 . The use of the apparatus (A) in according with  claim 12  in a charging hose ( 21 ) for bulk explosives.