Ukukhethwa kweeBheri zoomatshini: Iikhrayitheriya eziphambili kunye nokuqwalaselwa kokufaneleka

Intshayelelo

Ukukhetha i-bearing akusiyonto nje eyenziwa kwikhathalogu; sisigqibo soyilo esichaphazela umthamo womthwalo, isantya, ukuqina, ukungqubana, ubomi benkonzo, kunye nomngcipheko wokugcinwa kumatshini wonke. Ukhetho olufanelekileyo luxhomekeke kwindlela imithwalo ye-radial kunye ne-axial edibana ngayo nesantya sokusebenza, ukuthambisa, ubushushu, ungcoliseko, kunye neemeko zokufakela, kubandakanya ukulingana phakathi kwe-bearing, i-shaft, kunye ne-housing. Eli nqaku lichaza iikhrayitheriya eziphambili ezisetyenziselwa ukuthelekisa iintlobo zee-bearing kwaye lichaza indlela ukukhetha i-fit echaphazela ngayo ukusebenza, ukususwa kwangaphakathi, kunye nomngcipheko wokungaphumeleli. Ekugqibeleni, abafundi baya kuba nesakhelo esisebenzayo sokufanisa iimpawu zee-bearing neemeko zokusebenza zokwenyani kunye nokuphepha iimpazamo eziqhelekileyo zeenkcukacha.

Kutheni Ukukhetha Ukuthwala Kubalulekile

Ukuchaza i-bearing echanekileyo luqeqesho lobunjineli olusisiseko olulawula ngokuthe ngqo ukuthembeka koomatshini, ukusebenza kakuhle, kunye nobude bexesha lezixhobo ezijikelezayo. Ngelixa ii-bearing zinokubonakala ngathi zizinto ezithengiswa kakhulu, i-physics yobunjineli elawula ukusebenza kwazo iyinkimbinkimbi kakhulu, ibandakanya i-non-linear contact mechanics, i-elastohydrodynamic lubrication, kunye nesayensi yezinto ezichanekileyo. Ukukhetha i-bearing efanelekileyo kufuna uhlalutyo oluqinileyo lweemeko ezithile zomda wesicelo kunokuxhomekeka kumzekelo wembali okanye uqikelelo lwekhathalogu.

Xa iinjineli zinyangaiinkcukacha zokuthwalaNjengengcinga elandelayo, iinkqubo zoomatshini ezibangelwa zezi zinto zihlala zihlushwa ziimilinganiselo zokusebenza ezingaphantsi komgangatho ophezulu, ukungcangcazela okugqithisileyo, kunye nokusilela okukhulu kwangaphambi kwexesha. Indlela ecwangcisiweyo yokukhetha iibheringi inciphisa le mingcipheko, iqinisekisa ukuba icandelo elikhethiweyo liyahambelana nomgodi, indawo yokuhlala, kunye nezinto eziguquguqukayo zokusingqongileyo zangaphandle.

Impembelelo yomjikelo wobomi ekuthembekeni nakwixabiso

Iimpembelelo zemali kunye nokusebenza kokukhethwa kweebhereyitha zidlula kakhulu iindleko zokuqala zokuthenga. Kwizicelo zoshishino, iindleko zizonke zobunini (TCO) zijongise kakhulu kwiindawo zokugcina kunye nexesha lokungasebenzi elingacwangciswanga. Umzekelo, ibhereyitha ebiza i-$500 inokubangela ingeniso yemveliso elahlekileyo ye-$50,000 ukuba iyasilela ngaphambi kwexesha kwimpahla ebalulekileyo. Iinjineli zihlala ziyila ubomi obuthile bovavanyo olusisiseko lwe-L10—zihlala zijolise kwiiyure ezili-100,000 zeebhokisi zegiya zoshishino eziqhubekayo okanye izixhobo zokuvelisa umbane.

Ukufezekisa olu mjikelo wobomi obujoliswe kuwo kufuna ulungelelwaniso oluchanekileyo phakathi komthamo womthwalo oguqukayo webheri kunye nemithwalo yokwenyani yokusetyenziswa. Ubunjineli obugqithisileyo ngokukhetha ibheri enomlinganiselo ophezulu womthwalo kunokuba yingozi njengokunciphisa ubungakanani; iibheri ezinkulu ezisebenza phantsi kweemeko zomthwalo omncinci (ngokuqhelekileyo zifuna ubuncinci i-2% yomlinganiselo womthwalo oguqukayo) zisengozini yokutyibilika kweroller kunye nokuguguleka kweglue, nto leyo enciphisa kakhulu ukuthembeka.

Iingozi zokusebenza zeenkcukacha ezingezizo ezilungileyo

Ukusilela ukuchaza ngokuchanekileyo iiparameter zokusebenza ngexesha lesigaba sokuchazwa kuzisa umngcipheko omkhulu wokusebenza. Idatha yeshishini ibonisa ukuba nangona malunga ne-34% yokusilela kweebhereyitha ngaphambi kwexesha kuvela kwiingxaki zokuthambisa, i-16% ebalulekileyo ibangelwa ngokuthe ngqo kukhetho olubi lokuqala kunye nokulingana okungafanelekanga. Xa ibhereyitha ithwaxwa yimithwalo, isantya, okanye amaqondo obushushu ngaphandle kwesakhiwo sayo, uxinzelelo oluvelayo lubonakala ngokukhawuleza.

Iindlela zokusilela eziqhelekileyo ezibangelwa ziimpazamo zeenkcukacha ziquka ukuchithwa kwe-brinelling yokwenyani ngenxa yokugqithisa okungaguqukiyo, ukusasazeka okuncinci ngenxa yobukhulu befilimu ye-elastohydrodynamic enganeleyo, kunye nokuqhekeka kwekheji ngenxa yamandla amakhulu e-centrifugal ngesantya esiphezulu. Ezi ndlela zokusilela azitshabalalisi nje kuphela i-bearing kodwa zihlala zibangela umonakalo obalulekileyo kwiishafts, ii-housings, kunye ne-gearing ekufutshane, nto leyo ebangela ukuba kuhlengahlengiswe kakhulu kwaye kubize kakhulu oomatshini.

Iikhrayitheriya zobugcisa zokukhetha iibheringi

Ukuguqulela iimfuno zoomatshini kwi-geometry ethile yokuthwala kufuna ukuvavanya i-matrix yemigangatho yobugcisa esebenzisanayo. Akukho parameter inye inokwahlulwa; amandla esantya achaphazela ukhetho lokuthambisa, ngelixa ubukhulu bomthwalo bulawula ukususwa kwangaphakathi okufunekayo ukuthintela ukulayisha kwangaphambili okuyingozi ngexesha lokusebenza.

Umthwalo, isantya, ukuqina, kunye nokungahambi kakuhle

Izinto eziphambili ezibangela uyilo lweebhereyitha yimithwalo esetyenzisiweyo (i-radial, i-axial, okanye edibeneyo) kunye nesantya sokujikeleza. Uvavanyo lomthwalo oguqukayo (C) kunye novavanyo lomthwalo ozinzileyo (C0) kufuneka zivavanywe ngokuchasene nomthwalo oguqukayo olinganayo (P). Kwizicelo zesantya esiphezulu, iinjineli zisebenzisa i-speed factor (ndm), ebalwa njengobubanzi bepitch kwiimilimitha eziphindaphindwe ngesantya kwi-RPM. Iispindle zesixhobo somatshini zihlala zifuna amaxabiso e-ndm adlula i-1,000,000, nto leyo ebangela ukuba kube yimfuneko ukuchaneka koqhagamshelwano lwe-angular.iibheringi zebholangezinto eziqengqelekayo zeseramikhi.

Iimfuneko zokuqina zilawula i-geometry yangaphakathi kunye nee-engile zoqhagamshelwano, ngakumbi kwizixhobo ezichanekileyo apho ukuphambuka kweshaft kufuneka kuncitshiswe. Ukongeza, ukungalingani kwesakhiwo kufuneka kulinganiswe. Nangona iibheringi zebhola ezinzulu zihlala zikwazi ukuthwala ngaphantsi kwe-0.15 degrees yokungalingani, usetyenziso olunokugoba okukhulu kweshaft lunokufunaiibheringi zerola ezingqukuvas](https://www.demy-bearings.com) ekwaziyo ukuhlawula ukuya kuthi ga kwi-2.0 degrees yokungalingani okuguquguqukayo.

Ukulingana, imvume yangaphakathi, kunye nokunyamezelana

Ukunyamezelana kunye nokulingana kobukhulu kulawula indlela ibheriya esebenzisana ngayo nezinto zayo zokudibana. Iibheringi zenziwa kwiiklasi ezithile zokunyamezelana kwe-ISO (umz., iNormal, i-P6, i-P5, i-P4), kunye neeklasi ezichanekileyo eziphezulu ezifunekayo kwizicelo ezifuna ulawulo oluqinileyo lokubaleka. Ukukhethwa kokulingana kweshaft kunye nendlu—nokuba kukuphazamiseka (ukucinezela) okanye ukususwa (ukutyibilika)—kuxhomekeke kuhlobo lomthwalo (isangqa esijikelezayo kunye nesangqa esingashukumiyo).

Okubaluleke kakhulu, ukulingana kokuphazamiseka kwandisa indandatho yangaphakathi kwaye kucinezele indandatho yangaphandle, kunciphisa ukususwa kwangaphakathi kwebheri (RIC). Ukuba kufuneka ukulingana kokuphazamiseka okukhulu, iinjineli kufuneka zichaze ibheri enesithuba sangaphakathi esikhulu sokuqala, njenge-C3 okanye i-C4. Umzekelo, ukulingana kokuphazamiseka okuqhelekileyo kunokunciphisa ukususwa kwangaphakathi nge-0.015 mm ukuya kwi-0.030 mm; ukungaphumeleli ukuqikelela oku kunokubangela ukususwa okungalunganga kokusebenza, okukhokelela ekubalekeni okukhawulezayo kobushushu kunye nokuxhuzula.

Ukuthambisa, ukuvala, ubushushu, kunye nongcoliseko

Indawo yokusebenza ilawula iimfuno ze-tribological kunye nezinto eziphathekayo. Intsimbi ethwalayo eqhelekileyo (efana ne-52100 okanye i-100Cr6) idlula ekungazinzini kobukhulu kubushushu obuphezulu kwaye idla ngokukhawulelwa kubushushu bokusebenza obungaphantsi kwe-120°C. Ukuba ukusebenza okuqhubekayo kudlula i-150°C, iiringi zethwala kufuneka zidlule kwiinkqubo ezikhethekileyo zokufudumala (umz., ukuzinza kwe-S1 okanye i-S2) ukuthintela utshintsho lwe-metallurgical kunye nokwanda komthamo.

Ukukhethwa kokuthambisa—igrisi xa kuthelekiswa neoyile—kuqhutywa yisantya sokusebenza kunye neemfuno zokusasazeka kobushushu. Igrisi ikhethwa ngenxa yeempawu zayo zokuthambisa kunye nokugcinwa okuphantsi kodwa ngokubanzi inqunyelwe kumaxabiso aphantsi e-ndm. Kwiindawo ezingcoliswe kakhulu, ezifana noomatshini bemigodi okanye bezolimo, izisombululo zokuthambisa eziqinileyo (ezifana nezitywina ze-elastomer ezintathu okanye izitywina ze-labyrinth) ziyimfuneko ukuthintela ukungena kwamasuntswana, nto leyo eyonakalisa ngokukhawuleza igrisi kwaye iqalise ukuguguleka komzimba wesithathu.

Ukuthelekisa Iintlobo Zeebhere

Umahluko phakathi kwezinto eziqengqelekayo—ngokukodwa nokuba zisebenzisa uqhagamshelwano oluphambili okanye unxibelelwano lomgca—ngokusisiseko zitshintsha iimpawu zokusebenza kwebheriya. Ukuhamba kwiikhathalogu ezahlukeneyo zeentlobo zebheriya kufuna ukuqonda indlela ijiyometri yangaphakathi esabela ngayo kumandla okusetyenziswa kwe-macroscopic.

Umahluko ophambili phakathi kweentlobo eziphambili zeebhereyitha

Umahluko ophambili phakathi kweentlobo zeebhereyitha usekwe kukusasazwa kwazo komthwalo kunye nokuziphatha kwe-kinematic. Iibhereyitha zebhola ezinzulu zinokuguquguquka kakhulu, zibonelela ngesantya esingaqhelekanga kunye nokungqubana okuphantsi, kodwa zilinganiselwe kwizicelo zomthwalo onzima. Ngokwahlukileyo koko, iibhereyitha zeroli ezisilinda zibalaseleyo ekuxhaseni imithwalo emikhulu yeradial ngenxa yendawo yazo yoqhagamshelwano ende kodwa azinawo umthamo we-axial ngaphandle kokuba zifakwe ngokuthe ngqo.

Ukuqonda le mida yendalo kuvumela iinjineli ukuba zidibanise iintlobo zeebhereyitha ngobuchule. Ilungiselelo eliqhelekileyo lisebenzisa ibhereyitha esisigxina (umz., ibhereyitha yoqhagamshelwano enemigca emibini) ukuze ifumane ishafti ngokwe-axial, idibene nebhereyitha edadayo (umz., ibhereyitha ye-cylindrical roller) ukuze ilungele ukwanda kobushushu beshafti ngaphandle kokufaka imithwalo yokutyhala ebangelwa zizinambuzane.

Usebenzisa nini iibheringi zebhola xa kuthelekiswa neeroller

Isigqibo phakathi kweebheringi zebhola kunye neeroller sixhomekeke kakhulu kubukhulu bomthwalo osetyenzisiweyo kunye noxinzelelo loqhagamshelwano lweHertzian oluvelayo. Ngenxa yokuba iibheringi zebhola zisebenzisa uqhagamshelwano lwenqaku, uxinzelelo loxinzelelo kwindlela yokugijima luphezulu kakhulu phantsi kwemithwalo elinganayo xa kuthelekiswa noqhagamshelwano lomgca webheringi. Njenge-heuristic jikelele, ibheringi yeroller inika malunga namaxesha ama-3 ukuya kuma-5 amandla omthwalo we-radial webheringi yebhola enobukhulu obufanayo.

Nangona kunjalo, lo mthamo womthwalo owandisiweyo uza ngexabiso le-kinematic. Ukudibana komgca kwiibheringi zerola kuvelisa ukungqubana okuphezulu kwaye kulula ngakumbi ukulayishwa komphetho ukuba kwenzeka ukungalungelelani. Ngenxa yoko, iibheringi zerola zihlala zincitshiswa ngama-20% ukuya kuma-30% kwisantya esiphezulu esivumelekileyo xa kuthelekiswa neebheringi zebhola ezinobubanzi obufanayo bebore. Ke ngoko, iibheringi zebhola ziyindlela ekhethiweyo yeemoto zombane ezikhawulezayo kunye neespindles ezichanekileyo, ngelixa iibheringi zerola zilawula iibhokisi zegiya ezinzima, iirolling mills, kunye neeshafts eziphambili zeturbine yomoya.

Inkqubo yoKhetho lweeBhereyitha

Ukutshintsha ukusuka kwiimfuno zethiyori ukuya kwibhili yezinto ezigqityiweyo kufuna umsebenzi ocwangcisiweyo kakhulu nophindaphindayo. Inkqubo yokukhetha iibheringi ayifane ibe yimigca ethe tye; ukutyhila umda wobushushu kwinyathelo lesine kudla ngokufuna ukubuyela kwinyathelo lesibini ukuze ukhethe uyilo olwahlukileyo lweebheringi okanye icebo lokuthambisa.

Indlela yokukhetha inyathelo ngenyathelo

Indlela yokusebenza yokukhetha eqhelekileyo iqala ngokubhala phantsi ngokupheleleyo iimeko zomda wesicelo: imithwalo encinci neyona iphezulu, iiprofayili zesantya, imijikelo yomsebenzi, kunye namaqondo obushushu angqongileyo. Ngokusekelwe kwezi zinto zingeniswayo, iinjineli zikhetha uhlobo oluqhelekileyo lokuthwala (umz., i-roller ethambileyo vs. ibhola ye-groove enzulu) oluhambelana nolwalathiso lomthwalo kunye nobukhulu.

Nje ukuba uhlobo lukhethiwe, ubungakanani obuthile bumiselwa ngokubala umlinganiselo womthwalo ofunekayo ukuze kuhlangatyezwane nobomi be-L10 ekujoliswe kubo. Emva kokumiselwa kobungakanani, umsebenzi utshintshela ekuchazeni i-ecosystem ejikelezileyo: ukubala ukunyamezelana kwe-shaft kunye ne-housing, ukukhetha udidi olufanelekileyo lwe-internal clearance, kunye nokucacisa uhlobo lwe-lubrication kunye nendlela yokuhambisa. Inyathelo lokugqibela libandakanya ukuqinisekisa ukuba ubungakanani be-bearing kunye ne-lubrication ekhethiweyo zinokususa ngokukhuselekileyo ubushushu be-friction obuvelisiweyo kumaqondo obushushu asebenzayo angaguqukiyo.

Ukuqinisekiswa ngokubala nokuvavanya

Ukukhethwa kwethiyori kufuneka kuqinisekiswe ngokungqongqo kusetyenziswa iimodeli zokubala eziphambili kunye novavanyo olusebenzayo. Ubunjineli banamhlanje buxhomekeke kwi-modified rating life equation (ISO 281), eyongeza kwi-basic L10 calculation equation ($a_{ISO}$). Le factor ichaza imeko yokuthambisa nge-kinematic viscosity ratio ($\kappa$) kunye ne-contamination factor ($e_c$). Kwifilimu yokuthambisa ye-elastohydrodynamic efanelekileyo, kujoliswe kwixabiso le-$\kappa$ eliphakathi kwe-1.0 kunye ne-4.0.

Ngaphaya kokubala kohlalutyo, izicelo ezibalulekileyo zifuna uhlalutyo lwezinto ezilinganiselweyo (i-FEA) ukuqinisekisa ukuba ukugqwetheka kwezindlu phantsi kwemithwalo ephezulu akuyiphazamisi indandatho yangaphandle yebhereyi, nto leyo eya kukhokelela ekuxinaniseni okukhulu komthwalo. Okokugqibela, ukuqinisekiswa ngokomzimba ngovavanyo olukhawulezileyo lwebhereyi—oludla ngokufuna iiyure ezingama-500 ukuya kwi-1,000 zokusebenza ngokuqhubekayo phantsi kwemijikelo yomsebenzi oqikelelweyo—kwenziwa ukuqinisekisa uzinzo lobushushu, ukugcinwa kwegrisi, kunye neeprofayili zokukhupha i-acoustic ngaphambi kokuba kugunyaziswe imveliso epheleleyo.

Ukuphucula ukusebenza kunye nokufumaneka kwayo

Uyilo lwesisombululo esifanelekileyo sokuthwala imithwalo sisiqingatha nje somngeni; icandelo elichaziweyo kufuneka nalo libeiyasebenza kurhwebo, enokuveliswa, kwaye inokulungiswa kulo lonke ixesha lokusetyenziswa kwezixhobo. Ukufikelela kwibhalansi echanekileyo phakathi kokugqibelela kobugcisa obupheleleyo kunye nokusebenza kwekhonkco lobonelelo luxanduva olubalulekileyo lwenjineli yoyilo.

Ukubekwa emgangathweni kunye nokuqwalaselwa kokubonelela

Imarike yeebhereyitha zehlabathi ikumgangatho ophezulu ngokwemilinganiselo ye-ISO metric kunye ne-ABMA intshi yomda. Ukucacisa i-bearing yekhathalogu eqhelekileyo evela kuthotho olufana ne-6200, 6300, okanye i-22200 kuqinisekisa ukufumaneka kwemithombo emininzi, amaxabiso akhuphisanayo, kunye nokufumaneka kokutshintshwa kwangoko kubasebenzisi bokugqibela. Ukuphambuka kule migangatho kuzisa ukungqubana okukhulu kwekhonkco lokubonelela.

Xa iinjineli zichaza iijometri zangaphakathi ezenziwe ngokwezifiso, ukutywinwa okuzimeleyo, okanye ubukhulu obungengomgangatho, kufuneka ziqwalasele isohlwayo esiqatha sezothutho. Iibheringi ezenziwe ngokwezifiso zihlala ziyalela ubungakanani obuncinci be-oda (ii-MOQ) ezidlula iiyunithi ezili-1,000 kwaye zibandakanya amaxesha okukhokela emveliso aqala kwiiveki ezingama-24 ukuya kwezingama-40. Ngaphandle kokuba isicelo sikhethekile kakhulu—njengokusebenza kweenqwelo-moya okanye iirobhothi ezixineneyo kakhulu—ixabiso lilonke lobunini likhetha kakhulu ukuyila izindlu ezingqongileyo kunye neshaft ukuze kulungiselelwe ibheringi eqhelekileyo yeCommercial Off-The-Shelf (COTS).

Isikhokelo sokugqibela sesigqibo

Isigqibo sokugqibela seenkcukacha kufuneka sivavanywe nge-matrix elinganisa ukusebenza kobugcisa ngokuthelekisa ukufumaneka kwezorhwebo. Iinjineli kufuneka zigunyazise uphononongo loyilo oluchasa imfuneko yeeklasi zokunyamezelana okuchanekileyo (ezifana ne-ABEC 7/ISO P4) okanye izinto ezingaqhelekanga ukuba usetyenziso aluzifuni ngokungqongqo, njengoko ezi mpawu zonyusa iindleko zeeyunithi ngokukhawuleza.

Ekugqibeleni, ukhetho oluphumeleleyo lweebhereyi lufikelela kwisiphelo somzobo wobunjineli opheleleyo ochaza ngokucacileyo kungekuphela nje inani lenxalenye, kodwa nenani elifunekayo lokucoca, udidi lokunyamezelana, izinto zekheji, kunye neeparamitha zokuthambisa. Ngokunamathela ngokungqongqo kwinkqubo yokukhetha eqinisekisiweyo ngokwezibalo neyaziwayo ngokwezorhwebo, iinjineli ziqinisekisa ukufumaneka okuphezulu kweeasethi kwaye zikhusela ukuthembeka koomatshini kwemveliso yokugqibela.

Izinto ezibalulekileyo ekufuneka ziqwalaselwe

• Izigqibo ezibaluleke kakhulu kunye nesizathu sokukhetha iiBearing
• Iinkcukacha, ukuthobela imithetho, kunye nokuhlolwa komngcipheko okufuneka kuqinisekiswe ngaphambi kokuba uzibophelele
• Amanyathelo alandelayo asebenzayo kunye nezilumkiso abafundi abanokuzisebenzisa ngoko nangoko

Imibuzo ebuzwa qho

Ndingayikhetha njani uhlobo olufanelekileyo lokuthwala umatshini wam?

Tshatisa umthwalo kunye nesantya kuqala: umngxuma onzulu wemithwalo yeradial eqhelekileyo, uqhagamshelwano lwe-angular lwemithwalo edibeneyo, i-roller ethambileyo okanye engqukuva yemithwalo enzima, kunye neebheringi zeenaliti apho indawo incinci khona.

Ndingayisebenzisa nini into yokuphazamisa endaweni yokuvala isithuba?

Sebenzisa indawo yokuphazamiseka kwiringi ephantsi komthwalo ojikelezayo ukuze uthintele ukurhubuluza. Sebenzisa indawo yokuvula okanye yokutyibilika kwiringi phantsi komthwalo ongashukumiyo ukuze kube lula ukuyifakela nokunciphisa uxinzelelo olubangelwa kukulingana.

Kutheni i-internal clearance ibalulekile ekukhetheni iibheringi?

Ukulingana kunye nobushushu bokusebenza kunokunciphisa ukususwa kwangaphakathi kwe-radial. Khetha udidi lokususwa ukuze i-bearing ingalayishi kwangaphambili xa isebenza, ingakumbi koomatshini abasebenzisa isantya esiphezulu, umthwalo onzima, okanye abasebenza ngobushushu.

Zeziphi iindlela zokuthwala ezinikezelwa yi-DEMY kwizicelo ze-OEM kunye nezemizi-mveliso?

I-DEMY ibonelela ngeebheringi zebhola kunye neerola eziquka umngxuma onzulu, uqhagamshelwano lwe-angular, oluthambileyo, oluyi-cylindrical, oluyi-spherical, oluyi-needle, oluyi-thrust, oluyi-stainless, oluyi-ceramic, kunye nohlobo lwe-self-lubricating olusetyenziswa ngoomatshini abaninzi.

Ndingaqinisekisa njani ukuba i-bearing echanekileyo ivela kwikhathalogu ye-e-DEMY?

Jonga imbobo, ububanzi bangaphandle, ububanzi, uhlobo lomthwalo, isantya, iimfuno zokulingana, kunye nendawo yokusebenza. Emva koko qinisekisa udidi oluchanekileyo, ukususwa, kunye nezinto ezikwikhathalogu ye-elektroniki okanye ucele inkxaso yobugcisa ukuze kuqinisekiswe okokugqibela.