Granite's "Stubborn Streak" thiab Kev Sib Tw ntawm Kev Ceev
Granite zoo ib yam li "cov txiv ntoo tawv kom tawg"; nws cov hardness siab (Mohs hardness 6–7), siab ceev (kwv yees . 2.7 g/cm³), thiab compact qauv ua rau nws yooj yim rau cov teeb meem xws li "slippage" thiab "drill jamming" thaum lub sij hawm Down-the-Qhov (DTH) rauj ua haujlwm. Thaum nws los txog rau kev tsim kho ceev, nrawm dua tsis yog ib txwm zoo dua -ib qho kev cuam tshuam loj heev tuaj yeem ua rau cov tho me ntsis overheating thiab hnav ntxov ntxov, yog li ua tau kom txo tau qhov ua tau zoo. Qhov zoo tshaj plaws scenario yuav nrhiav tau ib tug ilv tshuav nyiaj li cas- ib tug taw tes uas yog "tsuas yog, nrog me ntsis ntxiv rau spare." Nyob ntawm seb qhov kev puas tsuaj nyob rau hauv cov pob zeb tsim, qhov cuam tshuam zaus feem ntau tswj ntawm 800-1200 tshuab ib feeb; txoj hauv kev no tswj xyuas lub sijhawm drilling thaum tiv thaiv cov khoom siv ntau dhau.
Kev xaiv khoom siv: Pairing "Hard Nuts" nrog "Hard Tools"
Qhov "kev ua tau zoo sib ntaus sib tua" ntawm DTH rauj system hinges ntawm kev sib koom ua ke ntawm nws cov pneumatic system thiab cov laum me ntsis. Rau cov pob zeb nyuaj zoo li granite, qhov tseem ceeb yuav tsum tau muab rau DTH hammers uas tau tsav los ntawm huab cua siab (1.5-2.5 MPa), ua ke nrog tungsten carbide alloy laum khoom. Nrog lub hardness thib ob tsuas yog pob zeb diamond, cov khoom no tso cai rau me ntsis nkag mus rau pob zeb strata kom tsis muaj zog li "kub riam los ntawm butter." Yog tias cov granite tsim tau zoo- txhim kho pob qij txha lossis pob txha, qhov cuam tshuam lub zog tuaj yeem hloov kho raws li: los ntawm kev txo cov cua siab mus rau 1.8-2.0 MPa, lub laum me ntsis tuaj yeem ua rau lub pob zeb sib tsoo thiab siv cov dav hlau sib koom ua ke kom nthuav dav thaj tsam fragmentation, muaj peev xwm boosting 20% - 3%.
Cov Txheej Txheem Ua Haujlwm: Peb Lub Tswv Yim Tseem Ceeb los Ua Pob Zeb "Yield"
"Pulsed" Drilling: Ncua qhov drilling rau 10 vib nas this tom qab txhua 50-100 hli ntawm kev nkag mus kom tso cai rau pob zeb txiav tawm. Qhov no tiv thaiv kev xyaum me ntsis los ntawm kev rov ua dua cov khoom qub, yog li txhawb kev ua haujlwm ntawm 15%.
"Mloog Pob Zeb": Cov neeg ua haujlwm paub txog tuaj yeem pom qhov xwm txheej ntawm lub pob zeb tsim los ntawm kev mloog lub suab ntawm lub pob zeb drilling. Yog hais tias lub suab ua muffled los yog npub, nws qhia tau hais tias lub laum me ntsis tawm tsam "chew los ntawm" tshwj xeeb tshaj yog nyuaj pob zeb; Nyob rau ntawm qhov kev sib tshuam no, qhov cuam tshuam zaus tuaj yeem raug txo, thiab tus neeg teb xov tooj tuaj yeem hloov mus rau ib txoj kev siv kev sib hloov thiab lub zog thrust rau "sib tsoo" los ntawm cov pob zeb txheej. "Cooling Magic": Txau cov dej me me ntawm qhov laum me ntsis -ceeb toom: qhov no tsis zoo ib yam li kev siv dej ntau ntau- ua haujlwm rau ob lub hom phiaj: nws txo qis qhov kub thiab txias thaum siv cov khoom lubricating ntawm cov dej kom txo tau kev sib txhuam, yog li stabilizing .5 rau ib xuab moos ntawm qhov drilling ceev (1 teev. pob zeb).