Ku China wakale, nthano ya Munthu Wachikulire Wopusa Wosuntha Mapiri imasonyeza mzimu wosagonjetseka wa kulimbikira mwa kuchita khama pang’onopang’ono ndi mokhazikika.

Pamene anthu analoŵa m’zaka za zana la 18, Kusintha kwa Mafakitale Koyamba kunabweretsa osati kusintha kwaumisiri kokha komanso kusintha kwakukulu kwa chikhalidwe cha anthu, kuloŵetsa m’nyengo imene makina anayamba kuloŵetsamo ntchito zamanja. Kuyambira nthawi imeneyo, ntchito yoboola miyala ndi kukumba yapita patsogolo kwambiri kunjira zachangu, zolimba, komanso zogwira mtima. Panthawiyi, mitundu yosiyanasiyana ya ulusi yolumikizira ndodo, kuphatikiza ulusi wokhazikika wa API ndi ulusi wooneka ngati mafunde a trapezoidal, adapangidwa.

Mfundo zogwirira ntchito za ulusizi zimasiyana, zomwe zimapangitsa kuti pakhale zofunikira zosiyanasiyana. Katswiri wina wamkulu pakampani yobowola wakambirana poyera za ulusi wobowola wodzigudubuza ndi nyundo zapamwamba. Zidziwitso zoperekedwa ndizofunika kwambiri kotero kuti zimanenedwa kukhala zamtengo wapatali kuposa zaka khumi zakuphunzira.

Mafuta a petroleum roller-cone amagwira ntchito pozungulira ndi kuphwanya mwala, ndi ndodo zobowola pogwiritsa ntchito ulusi wa API. Ulusiwu umangokhala ndi gwero la axial, mphamvu zozungulira, ndi mphamvu zina zokhuza, osatumiza mphamvu ku ndodo. Ulusi wokhazikika wa API umapangidwa makamaka kuti ulumikizane, kumangirira, ndi kusindikiza, zomwe zimapangitsa kuti pakhale mphamvu zochepa komanso kutenthedwa kosafunikira.

Mosiyana ndi izi, ndodo zobowola nyundo zapamwamba nthawi zambiri zimagwiritsa ntchito ulusi wooneka ngati R kapena T. Mphamvu yochokera ku hydraulic rock drill imaperekedwa kudzera mu ndodo kupita ku pobowola, zomwe zimapangitsa kuti mphamvu iwonongeke kwambiri ngati kutentha kwa ulusi, ndipo kutentha kumatha kupitirira 400 ° C. Ngati ulusi wokhazikika wa API ukanagwiritsidwa ntchito pa ndodo zapamwamba za nyundo, sizingakhale zopanda mphamvu pakutumiza mphamvu, komanso zitha kuvutitsidwa ndi kukokoloka, zomwe zimapangitsa kuti ndodo zobowola zikhale zovuta kusweka komanso kusokoneza kwambiri ntchito yomanga ndikuwonjezera ndalama.

M'zaka za m'ma 1970 ndi 80s, kufufuza kwakukulu kunachitidwa ndi akatswiri akunja pa ulusi wogwiritsidwa ntchito pamwamba pa ndodo zobowola nyundo, poganizira za mawonekedwe ozungulira, ophatikizika, obwerera kumbuyo, FL, ndi ulusi wa trapezoidal. Zinatsimikiziridwa kuti ulusi wooneka ngati mafunde ndi woyenera ndodo zokhala ndi ma diameter pansi pa 38 mm, pamene ulusi wa trapezoidal ndi woyenera kwambiri kwa ndodo zomwe zimakhala pakati pa 38 mm ndi 51 mm.

M'zaka za m'ma 2100, ndi kukula kwa nyundo zapamwamba komanso kulimba kwa mizu ya ulusi, makampani osiyanasiyana obowola adayambitsa mitundu yatsopano ya ulusi monga SR, ST, ndi GT kudzera mu kafukufuku wosalekeza ndi chitukuko.

Mwachidule, pobowola thanthwe, kulumikiza ulusi pamwamba pa ndodo zobowola nyundo ndi chimodzi mwazinthu zazikulu zogwiritsira ntchito mphamvu komanso chinthu chachikulu pakulephera kwa ndodo zobowola.

Monga momwe Buddhism imaphunzitsira, "chiyambi chodalira chilibe kanthu, ndipo munthu sayenera kumamatira ku njira iliyonse." Ndi kupita patsogolo komwe kukuchitika mu sayansi ndi ukadaulo, ndikofunikira kulingalira ngati mawonekedwe a ulusi omwe amagwiritsidwa ntchito pano ali njira yabwino kwambiri komanso yomaliza yolumikizira makampani obowola ma hydraulic.