Zakale ndi zamakono za Cone bit

Kuyambira pomwe cone bit yoyamba idayamba mu 1909, cone bit yakhala ikugwiritsidwa ntchito kwambiri padziko lonse lapansi. Tricone bit ndiye drill bit yodziwika bwino yomwe imagwiritsidwa ntchito pobowola mozungulira. Mtundu uwu wa drill uli ndi mapangidwe osiyanasiyana a mano ndi mitundu yosiyanasiyana ya ma bearing junction, kotero imatha kusinthidwa kuti igwirizane ndi mitundu yosiyanasiyana ya mapangidwe. Pa ntchito yobowola, kapangidwe koyenera ka cone bit kamatha kusankhidwa molondola malinga ndi mawonekedwe a drill, ndipo liwiro lokwanira la drill ndi bit footage zitha kupezeka.

Mfundo yogwirira ntchito ya cone bit

Pamene chogwirira cha koni chikugwira ntchito pansi pa dzenje, chogwirira chonsecho chimazungulira mozungulira chogwirira cha koni, chomwe chimatchedwa revolution, ndipo ma cones atatuwo amagubuduzika pansi pa dzenjelo motsatira mzere wawo, womwe umatchedwa kuzungulira. Kulemera kwa chogwirira chomwe chimayikidwa pamwala kudzera m'mano kumapangitsa kuti mwalawo usweke (kuphwanya). Mu ndondomeko yozungulira, chogwiriracho chimalumikizana mosinthasintha pansi pa dzenjelo ndi mano amodzi ndi mano awiri, ndipo malo apakati pa chogwiriracho amakhala okwera komanso otsika, zomwe zimapangitsa kuti chogwiriracho chizigwedezeka nthawi yayitali. Kugwedezeka kwa nthawi yayitali kumeneku kumapangitsa kuti chingwe chobowola chizipindike ndikutambasuka mosalekeza, ndipo chingwe chobowola chapansi chimasintha kusintha kwa cyclic elastic deformation kukhala mphamvu yokhudza mapangidwe kudzera m'mano kuti aswe mwalawo. Kugwedezeka uku ndi kuphwanya ndiyo njira yayikulu yophwanya miyala pogwiritsa ntchito chogwirira cha koni.

Kupatula kukhudza ndi kuphwanya mwala pansi pa dzenje, chidutswa cha koni chimapanganso mphamvu yodula miyala pansi pa dzenje.

Kugawa ndi kusankha koni

Pali opanga ambiri a ma cone bits, omwe amapereka mitundu yosiyanasiyana ndi kapangidwe ka ma cone bits. Pofuna kupangitsa kusankha ndi kugwiritsa ntchito ma cone bits kukhala kosavuta, International Institute of Drilling Contractors (IADC) yapanga muyezo wogwirizana wa magulu ndi njira yowerengera manambala a ma cone bits padziko lonse lapansi.