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在中硬岩石(4—7级)中,以钻粒(钢粒)钻进,当使用的粗径钻具口径超过110毫米时,因回次进尺较多(超过2.5米),岩心过重,往往卡取不牢而脱落。为此,我队试制了一种岩心卡手,应用效果良好,既防止了岩心脱落事故,又节约了采心用的铁丝。岩心卡手如图所示,它是在口径130毫米的粗径钻具上使用的。它一头与岩心管连接,另一头与钻头连接,下至井内,作为粗径钻具的一个粗成部分。当回次钻进秸束,投入大小适当的石粒,并可配合投入一些铁砂。由于卡手带有锥度,内径细,卡塞物便随锥度牢牢地卡住岩心,从而保征卡手和岩心管中的岩心被采取上来。但此卡手的应用范围,有一定局限:如岩心坚硬(8极以上)或破碎,都不宜用此卡手,
In the hard rock (4-7 level), to drill the grain (steel grain) drilling, when the use of coarse diameter drill diameter more than 110 mm, due to the more footage (more than 2.5 meters), overweight core , Often take the card is not strong and fall off. To this end, my team trial production of a core card hand, the application of good results, both to prevent the core accidental fall off, but also save the heart with the wire. As shown in the figure, the core gripper is used on a large diameter 130 mm caliber drill. It is connected to the core tube at one end and to the drill bit at the other, down to the well, as a coarse part of the large diameter drill. When drilling back into the straw, into the appropriate size of stone, and can be put into some iron sand. Due to the card handle with taper, the inner diameter is fine, the jammed material firmly grips the core with the taper, thus holding the core in the gripper and the core tube. However, the application of this card hand has some limitations: If the core is hard (8 pole or more) or broken, it is inappropriate to use this card hand,