Ukuhlukaniswa kwezinto kuyinkinga engokwemvelo kubuchwepheshe obuningi bokugcina.Njengoba isidingo semikhiqizo yekhwalithi ephezulu sikhula, inkinga yokuhlukaniswa kwesitoko iba nkulu kakhulu.
Njengoba sonke sazi, ama-telescopic radial stack conveyors ayisixazululo esisebenza kahle kakhulu sokuhlukaniswa kwezitaki.Bangakwazi ukudala i-inventory ngezingqimba, ungqimba ngalunye lwakhiwe inani lezinto.Ukuze udale i-inventory ngale ndlela, isihambisi kufanele sisebenze cishe ngokuqhubekayo.Ngenkathi ukunyakaza kwama-telescopic conveyor kufanele kulawulwe ngesandla, i-automation iyindlela ephumelela kakhulu yokulawula.
Izihambisi ezizenzakalelayo ezihoxiswayo zingahle zihlelwe ukuze zenze uhlu lwangokwezifiso oluhlukahlukene ngobukhulu, ukwakheka nokucushwa.Lokhu kuvumelana nezimo cishe okungenamkhawulo kungathuthukisa ukusebenza kahle sekukonke futhi ilethe imikhiqizo yekhwalithi ephezulu.
Osonkontileka bachitha izigidi zamadola unyaka ngamunye bekhiqiza imikhiqizo ehlanganisiwe yezinhlelo zokusebenza ezihlukahlukene.Izicelo ezidume kakhulu zifaka izinto eziyisisekelo, i-asphalt nokhonkolo.
Inqubo yokudala imikhiqizo yalezi zinhlelo zokusebenza iyinkimbinkimbi futhi iyabiza.Ukucaciswa okuqinile nokubekezelelana kusho ukuthi ukubaluleka kwekhwalithi yomkhiqizo kuya ngokuya kubaluleke kakhulu.
Ekugcineni, impahla iyasuswa esitokisini futhi ithuthelwe endaweni lapho izofakwa khona endaweni engaphansi, itiyela noma ukhonkolo.
Izinto ezidingekayo zokuhlubula, ukuqhunyiswa, ukuchotshozwa kanye nokuhlola zibiza kakhulu.Kodwa-ke, imishini ethuthukisiwe ingahlala ikhiqiza i-aggregate ngokuya ngokucaciswa.I-inventory ingase ibukeke njengengxenye engasho lutho yokukhiqiza okuhlanganisiwe, kodwa uma kwenziwa ngendlela engalungile, kungase kubangele umkhiqizo othobelana ngokuphelele nesicaciso esingahlangani nencazelo.Lokhu kusho ukuthi ukusebenzisa izindlela zokulondoloza ezingalungile kungaholela ekulahlekelweni ezinye zezindleko zokudala umkhiqizo wekhwalithi.
Nakuba ukubeka umkhiqizo ohlwini lwezimpahla kungase kubeke engcupheni ikhwalithi yawo, i-inventory iyingxenye ebalulekile yenqubo yokukhiqiza iyonke.Kuyindlela yokugcina eqinisekisa ukutholakala kwempahla.Izinga lokukhiqiza livamise ukuhluka esilinganisweni somkhiqizo odingekayo kuhlelo olunikeziwe, futhi uhlu lwamagama lusiza ukwenza umehluko.
I-Inventory iphinde inikeze osonkontileka indawo eyanele yokugcina ukuze baphendule ngempumelelo esidingweni semakethe esishintshashintshayo.Ngenxa yezinzuzo ezihlinzekwa yisitoreji, iyohlala iyingxenye ebalulekile yenqubo yokukhiqiza iyonke.Ngakho-ke, abakhiqizi kufanele baqhubeke bethuthukisa ubuchwepheshe babo bokugcina ukuze banciphise ubungozi obuhlobene nesitoreji.
Isihloko esiyinhloko salesi sihloko ukuzihlukanisa.Ukuhlukaniswa kuchazwa ngokuthi "ukuhlukaniswa kwezinto ngokusho kosayizi wezinhlayiyana".Ukusetshenziswa okuhlukile kwama-aggregate kudinga amamaki ezinto ezibonakalayo acacile futhi afanayo.Ukwehlukaniswa kuholela ekuhlukeni ngokweqile kwezinhlobo zemikhiqizo.
Ukwehlukana kungenzeka noma yikuphi kunqubo yokukhiqiza ehlanganisiwe ngemva kokuba umkhiqizo uchotshoziwe, uhloliwe futhi wahlanganiswa ukuze uhlelwe ngendlela efanele.
Indawo yokuqala lapho ukuhlukaniswa kungenzeka khona ku-inventory (bheka Umfanekiso 1).Uma impahla isibekiwe ohlwini lwamagama, izogcina igaywe kabusha futhi ilethwe endaweni lapho izosetshenziswa khona.
Indawo yesibili lapho ukuhlukana kungenzeka khona ngesikhathi sokucubungula nokuthutha.Uma ususendaweni ye-asphalt noma isitshalo sikakhonkolo, isamba sifakwa kuma-hopper kanye/noma emigqonyeni yokugcina lapho umkhiqizo uthathwa futhi usetshenziswe khona.
Ukwehlukana kwenzeka futhi lapho kugcwalisa futhi kuthululwa izisele nezisele.Ukuhlukaniswa kungase kwenzeke ngesikhathi sokusetshenziswa kokuhlanganiswa kokugcina emgwaqeni noma kwenye indawo ngemuva kokuba i-aggregate ihlanganiswe ne-asphalt noma i-concrete mix.
I-homogeneous aggregate ibalulekile ekukhiqizeni i-asphalt yekhwalithi ephezulu noma ukhonkolo.Ukushintshashintsha kokuhleleka kweqoqo elihlukanisekayo kwenza kube nzima ukuthola itiyela noma ukhonkolo owamukelekayo.
Izinhlayiya ezincane zesisindo esinikeziwe zinendawo engaphezulu yesamba esikhulu kunezinhlayiya ezinkulu zesisindo esifanayo.Lokhu kudala izinkinga lapho kuhlanganiswa ama-aggregate abe yi-asphalt noma izingxube zikakhonkolo.Uma iphesenti lenhlawulo ku-aggregate liphezulu kakhulu, kuzoba nokuntuleka kodaka noma i-bitumen futhi ukuxuba kuzoba kukhulu kakhulu.Uma iphesenti lezinhlayiya ezimahhadla ku-aggregate liphezulu kakhulu, kuzoba nodaka noma itiyela ngokweqile, futhi ukuvumelana kwengxube kuzoba mncane kakhulu.Imigwaqo eyakhiwe ngezilinganiso ezihlukanisiwe inobuqotho obumpofu besakhiwo futhi ekugcineni izoba nesikhathi sokuphila esiphansi kunemigwaqo eyakhiwe ngemikhiqizo ehlukaniswe kahle.
Izinto eziningi ziholela ekuhlukaniseni esitokweni.Njengoba izinto eziningi zakhiwe kusetshenziswa amabhande okuthutha, kubalulekile ukuqonda umthelela ongokwemvelo wamabhande okuhambisa ekuhleleni izinto.
Njengoba ibhande lihambisa impahla phezu kwebhande lokuthutha, ibhande liyabhampa kancane njengoba ligingqika phezu kwepulley engenzi lutho.Lokhu kungenxa yokuntenga kancane kwebhande phakathi kwepulley ngayinye engenzi lutho.Lokhu kunyakaza kubangela ukuthi izinhlayiya ezincane zihlale phansi kwengxenye yesiphambano sezinto.Ukunqwabelana okusanhlamvu okumahhadla kuwagcina phezulu.
Ngokushesha nje lapho impahla ifinyelela isondo lokukhipha lebhande lokuthutha, selivele lihlukaniswe ngokwengxenye kusuka ezintweni ezinkulu phezulu kanye nempahla encane phansi.Lapho impahla iqala ukuhamba eduze kwejika lesondo lokuphuma, izinhlayiya ezingaphezulu (zangaphandle) zihamba ngesivinini esikhulu kunezinhlayiya ezingezansi (zangaphakathi).Lo mehluko ngesivinini ube usubangela ukuthi izinhlayiya ezinkulu zisuke kusihambisi ngaphambi kokuwela esitaki, kuyilapho izinhlayiya ezincane ziwela eduze kwesithuthi.
Futhi, maningi amathuba okuba izinhlayiya ezincane zinamathele ebhandeni lokuthutha futhi zingakhishelwa kuze kube yilapho ibhande lokuthutha liqhubeka nokuphephuka esondweni lokukhipha.Lokhu kubangela izinhlayiya ezinhle kakhulu ezihamba phambili zibheke phambili kwesitaki.
Uma okubalulekile kuwela esitakini, izinhlayiya ezinkulu ziba nomfutho wangaphambili omningi kunezinhlayiya ezincane.Lokhu kubangela ukuthi izinto ezimahhadla ziqhubeke nokwehla kalula kunento ecolekile.Noma iyiphi impahla, enkulu noma encane, eyehla emaceleni esitaki ibizwa ngokuthi ukuchitheka.
Ukuchitheka kungenye yezimbangela eziyinhloko zokuhlukana kwesitoko futhi kufanele kugwenywe noma nini lapho kungenzeka.Njengoba ukuchitheka kuqala ukuginqika emthambekeni wempango, izinhlayiya ezinkulu zivamise ukugingqika zehle bonke ubude bomthambeka, kuyilapho impahla ecolekile ivame ukuhlala ezinhlangothini zempango.Ngakho-ke, njengoba ukuchitheka kuqhubekela phansi emaceleni enqwaba, izinhlayiya ezincane nezincane ezincane ezisala ku-billowing material.
Lapho impahla ifinyelela emaphethelweni aphansi noma uzwane lwenqwaba, yakhiwa ngokuyinhloko izinhlayiya ezinkulu.Ukuchitheka kubangela ukuhlukaniswa okuphawulekayo, okubonakala esigabeni sesitoko.Uzwane lwangaphandle lwenqwaba luqukethe izinto ezimahhadla, kanti inqwaba yangaphakathi nengaphezulu iqukethe into ecolekile.
Ukuma kwezinhlayiya nakho kunomthelela emiphumeleni emibi.Izinhlayiya ezibushelelezi noma eziyindilinga kungenzeka ukuthi zehle emthambekeni wesitaki kunezinhlayiya ezincane, ezivame ukuba nesikwele ngomumo.Ukweqa imikhawulo kungaholela ekulimaleni kwezinto.Lapho izinhlayiya zehla ohlangothini olulodwa lwenqwaba, zikhuhlana zodwa.Lokhu kugqoka kuzobangela ukuthi ezinye zezinhlayiya zihlehle zibe osayizi abancane.
Umoya ungesinye isizathu sokuzihlukanisa.Ngemva kokuba impahla ishiye ibhande lokuthutha futhi iqala ukuwela esitaki, umoya uthinta umzila wokuhamba kwezinhlayiya ezinobukhulu obuhlukahlukene.Umoya unethonya elikhulu ezintweni ezithambile.Lokhu kungenxa yokuthi isilinganiso sendawo engaphezulu nesisindo sezinhlayiya ezincane sikhulu kunaleso sezinhlayiya ezinkulu.
Amathuba okuhlukaniswa kwempahla angahluka kuye ngohlobo lwempahla esendlini yokugcina impahla.Isici esibaluleke kakhulu maqondana nokuhlukaniswa yizinga lokushintshwa kosayizi wezinhlayiyana endabeni.Izinto ezinokuhlukahluka kosayizi wezinhlayiyana zizoba nezinga eliphakeme lokuhlukaniswa ngesikhathi sokugcina.Umthetho ojwayelekile wesithupha uwukuthi uma isilinganiso sosayizi wezinhlayiyana ezinkulu kuya kusayizi wezinhlayiyana ezincane kakhulu sidlula u-2:1, kungase kube nezinkinga ngokuhlukaniswa kwephakheji.Ngakolunye uhlangothi, uma isilinganiso sikasayizi wezinhlayiyana singaphansi kuka-2:1, ukuhlukaniswa kwevolumu kuncane.
Isibonelo, izinto eziqukethe izinhlayiya ezifika ku-200 mesh zingase zinciphise ngesikhathi sokugcina.Kodwa-ke, lapho ugcina izinto ezinjengamatshe ahlanjululwe, i-insulation izoba yinto encane.Njengoba iningi lesihlabathi limanzi, ngokuvamile kungenzeka ukugcina isihlabathi ngaphandle kokuhlukanisa izinkinga.Umswakama udala ukuthi izinhlayiya zihlangane, zivimbele ukuhlukana.
Lapho umkhiqizo ugcinwa, ukuhlukaniswa ngezinye izikhathi akunakwenzeka ukukuvimbela.Unqenqema lwangaphandle lwenqwaba eqediwe luqukethe ikakhulukazi izinto ezimahhadla, kuyilapho ingaphakathi lenqwaba liqukethe inani eliphakeme lezinto ezinhle.Uma uthatha izinto ezivela ekupheleni kwezinqwaba ezinjalo, kuyadingeka ukuthatha ama-scoops ezindaweni ezahlukene ukuxuba impahla.Uma uthatha impahla ngaphambili noma ngemuva kwesitaki kuphela, uzothola konke okumahhadla noma konke okuhle.
Akhona namathuba okufakwa okungeziwe lapho kulayishwa amaloli.Kubalulekile ukuthi indlela esetshenzisiwe ingabangeli ukuchichima.Layisha ingaphambili elolini kuqala, bese kuba ngemuva, bese ekugcineni libe phakathi.Lokhu kuzonciphisa imiphumela yokulayisha ngokweqile ngaphakathi kweloli.
Izindlela zokuphatha zangemuva kokufakwa kwempahla ziwusizo, kodwa umgomo kufanele kube ukuvimbela noma ukunciphisa ukuvalelwa ngesikhathi sokudala uhlu lwempahla.Izindlela eziwusizo zokuvimbela ukuzihlukanisa zihlanganisa:
Uma ipakishwe elolini, kufanele ipakishwe kahle ezitaki ezihlukene ukuze kuncishiswe ukuchitheka.Impahla kufanele ihlanganiswe ndawonye kusetshenziswa isilayishi, ikhuphuke ifinyelele ubude bebhakede eligcwele kanye nokulahla, okuzoxuba impahla.Uma isilayishi kufanele sinyakaze futhi siphule impahla, ungazami ukwakha izinqwaba ezinkulu.
Ukwakha i-inventory ngezendlalelo kunganciphisa ukuhlukaniswa.Lolu hlobo lwendlu yokugcina impahla lungakhiwa ngogandaganda.Uma impahla ilethwa egcekeni, i-bulldozer kumele iphushele impahla ongqimbeni olwehlelayo.Uma isitaki sakhiwe ngebhande le-conveyor, i-bulldozer kufanele iphushe impahla ibe ungqimba oluvundlile.Kunoma yikuphi, ukunakekelwa kufanele kuthathwe ukuthi ungasunduzi impahla phezu konqenqema lwenqwaba.Lokhu kungaholela ekuchichimeni, okungesinye sezizathu eziyinhloko zokuhlukana.
Ukupakisha ngogandaganda kunokuningi okungalungile.Izingozi ezimbili ezibalulekile ukuwohloka nokonakala komkhiqizo.Izisetshenziswa ezinzima ezisebenza ngokuqhubekayo emkhiqizweni zizobumbana futhi zichoboze okokusebenza.Uma usebenzisa le ndlela, abakhiqizi kufanele baqaphele ukuthi bangawehlisi ngokweqile umkhiqizo ngomzamo wokunciphisa izinkinga zokuhlukana.Umsebenzi owengeziwe kanye nemishini edingekayo ngokuvamile kwenza le ndlela ibize ngendlela engafanele, futhi abakhiqizi kufanele baphendukele ekuhlukaniseni ngesikhathi sokucubungula.
Ama-Radial stacking conveyors asiza ukunciphisa umthelela wokuhlukaniswa.Njengoba i-inventory inqwabelana, isihambisi sihamba ngokukhulu ukuya kwesokunxele nakwesokudla.Njengoba i-conveyor ihamba ngokukhazimulayo, iziphetho zezitaki, ngokuvamile ezimahhadla, zizombozwa ngezinto ezicolekile.Iminwe yangaphambili nangemuva izobe isalokhu ilukhuni, kodwa inqwaba izoxubene kakhulu kunenqwaba yama-cones.
Kukhona ubudlelwano obuqondile phakathi kokuphakama nokuwa kwamahhala kwezinto kanye nezinga lokuhlukaniswa okwenzekayo.Njengoba ukuphakama kukhuphuka futhi i-trajectory yezinto eziwayo ikhula, kuba nokuhlukana okwandayo kwezinto ezinhle neziqinile.Ngakho-ke amaconveyor okuphakama okuguquguqukayo angenye indlela yokunciphisa ukuhlukaniswa.Esigabeni sokuqala, isidluliseli kufanele sibe sendaweni ephansi kakhulu.Ibanga eliya ku-pulley yekhanda kufanele lihlale lifushane ngangokunokwenzeka.
Ukuwa mahhala kusuka ebhandeni elidluliselayo lingene esitakini kungesinye isizathu sokuhlukana.Izitebhisi zamatshe zinciphisa ukuhlukaniswa ngokususa izinto eziwa mahhala.Izitebhisi zamatshe yisakhiwo esivumela izinto ukuthi zigeleze phansi ezitebhisini zingene ezinqwabeni.Iyasebenza kodwa inomkhawulo wohlelo lokusebenza.
Ukwehlukana okubangelwa umoya kungancishiswa ngokusebenzisa ama-chute e-telescopic.Ama-chute e-telescopic ezithungwini zokukhishwa komthumeli, ukusuka esithungwini kuya esitakini, avikela emoyeni futhi akhawulele umthelela wawo.Uma iklanywe kahle, inganciphisa nokuwa kwamahhala kwezinto.
Njengoba kushiwo ngaphambili, sekuvele kune-insulation ebhandeni lokuthutha ngaphambi kokufinyelela endaweni yokukhipha.Ngaphezu kwalokho, lapho impahla ishiya ibhande lokuthutha, ukuhlukaniswa okuqhubekayo kwenzeka.Isondo lokugwedla lingafakwa endaweni yokukhipha ukuze kuxutshwe kabusha le nto.Amasondo ajikelezayo anamaphiko noma ama-paddles anqamula futhi axube indlela yezinto.Lokhu kuzonciphisa ukuhlukaniswa, kodwa ukucekelwa phansi kwezinto ezibonakalayo kungase kungamukeleki.
Ukwehlukana kungabandakanya izindleko ezinkulu.Uhlu lwempahla olungahlangabezani nezicaciso lungase luphumele ekujezisweni noma ekunqatshweni kwalo lonke uhlu lwamagama.Uma impahla engavumelani ilethwa endaweni yomsebenzi, izinhlawulo zingadlula u-$0.75 ngethani.Izindleko zabasebenzi kanye nemishini yokulungisa izinqwaba zezinga eliphansi zivame ukunqanda.Izindleko zehora zokwakha i-warehouse ngogandaganda kanye no-opharetha ziphezulu kunezindleko zesithuthi esizenzakalelayo se-telescopic, futhi impahla ingase ibole noma yonakale ukuze kugcinwe ukuhlelwa okufanele.Lokhu kunciphisa inani lomkhiqizo.Ukwengeza, lapho okokusebenza okufana nogandaganda kusetshenziselwa imisebenzi engakhiqizi, kuba khona izindleko zethuba ezihambisana nokusebenzisa okokusebenza ngenkathi kwenziwa imali ukuze kwenziwe imisebenzi yokukhiqiza.
Enye indlela ingathathwa ukuze kuncishiswe umthelela wokuzihlukanisa lapho kwakhiwa uhlu lwezinhlelo zokusebenza lapho ukuzihlukanisa kungaba yinkinga.Lokhu kuhlanganisa ukunqwabelana ezingqimbeni, lapho ungqimba ngalunye lwakhiwe uchungechunge lwezitaki.
Esigabeni sesitaki, isitaki ngasinye siboniswa njengesitaki esincane.Ukuhlukana kusenzeka enqwabeni ngayinye ngenxa yemiphumela efanayo okukhulunywe ngayo ekuqaleni.Kodwa-ke, iphethini yokuhlukanisa ivame ukuphindaphindiwe phezu kwayo yonke ingxenye yesiphambano senqwaba.Izitaki ezinjalo kuthiwa “zinokulungiswa kokuhlukana” okukhulu ngenxa yokuthi iphethini yegradient ehlukile iphinda kaningi ngezikhawu ezincane.
Lapho ucubungula izitaki nge-loader yangaphambili, asikho isidingo sokuxuba izinto, njengoba i-scoop eyodwa ihlanganisa izitaki eziningana.Lapho isitaki sibuyiselwa, izendlalelo ngazinye zibonakala ngokucacile (bona Umfanekiso 2).
Izitaki zingakhiwa kusetshenziswa izindlela ezahlukene zokugcina.Enye indlela ukusebenzisa ibhuloho kanye nesistimu yokuthutha impahla, nakuba le nketho ifaneleka kuphela izinhlelo zokusebenza ezimile.Ububi obuphawulekayo bezinhlelo zokuthutha ezimile ukuthi ubude bazo buvamise ukumiswa, okungaholela ekuhlukaneni komoya njengoba kuchazwe ngenhla.
Enye indlela ukusebenzisa i-telescopic conveyor.Amaconveyor e-telescopic ahlinzeka ngendlela ephumelela kakhulu yokwenza izitaki futhi ngokuvamile akhethwa kunezinhlelo ezimile njengoba zinganyakaziswa lapho kudingeka, futhi eziningi ziklanyelwe ukuthwalwa emgwaqweni.
Amaconveyors e-telescopic ahlanganisa ama-conveyors (ama-guard conveyors) afakwe ngaphakathi kwama-conveyors angaphandle anobude obufanayo.I-tip conveyor ingahamba ngokulandelana ngobude besithumeli esingaphandle ukuze iguqule indawo ye-pulley yokulayisha.Ubude besondo lokukhipha kanye nendawo ye-radial yesithumeli kuyahlukahluka.
Ukushintsha kwe-triaxial kwesondo lokuthulula kubalulekile ukuze kwakhiwe izinqwaba ezinezingqimba ezinqoba ukuhlukaniswa.Amasistimu ewintshi ezintambo ngokuvamile asetshenziselwa ukunweba nokuhoxisa ama-feed conveyors.Ukunyakaza kwe-radial komthumeli kungenziwa ngeketanga kanye nesistimu ye-sprocket noma ngedrayivu yeplanethi eqhutshwa ngamanzi.Ukuphakama kwesithuthi kuvame ukushintshwa ngokwelula amasilinda angaphansi kwenqola ye-telescopic.Konke lokhu kunyakaza kufanele kulawulwe ukuze kwakhiwe ngokuzenzakalelayo ama-multilayer piles.
I-Telescopic conveyors inendlela yokwenza izitaki ze-multilayer.Ukunciphisa ukujula kwesendlalelo ngasinye kuzosiza ukukhawulela ukuhlukana.Lokhu kudinga isidluliseli ukuthi siqhubeke sihamba njengoba i-inventory yakha.Isidingo sokuhamba njalo senza kube nesidingo sokuzenzakalela ama-conveyors e-telescopic.Kunezindlela eziningana ezihlukene zokuzenzakalela, ezinye zazo ezishibhile kodwa ezinemikhawulo ebalulekile, kuyilapho ezinye zihleleka ngokugcwele futhi zinikeza ukuguquguquka okwengeziwe ekudaleni uhlu.
Uma isidluliseli siqala ukuqongelela okokusebenza, sinyakaza kakhulu ngenkathi sihambisa impahla.I-conveyor iyahamba kuze kube yilapho inkinobho yomkhawulo efakwe ku-shaft ye-conveyor iqaliswa endleleni yayo ye-radial.I-trigger ibekwa kuye ngobude be-arc u-opharetha afuna ukuthi ibhande lokudlulisa lihambe.Ngalesi sikhathi, isithumeli-mpahla sizonwebeka siye ebangeni elinqunywe kusengaphambili futhi siqale ukuya kwelinye icala.Le nqubo iyaqhubeka kuze kube yilapho isidlulisi sezintambo sinwetshwa kuze kufike ekunwetshweni kwaso okuphezulu futhi isendlalelo sokuqala siqediwe.
Lapho izinga lesibili lakhiwe, ithiphu iqala ukuhlehla esandisweni salo esiphezulu, inyakaza ngomsakazo futhi ihoxise emkhawulweni we-arcuate.Yakha izendlalelo kuze kube yilapho inkinobho yokutsheka egibele esondweni lokusekela yenziwe inqwaba.
I-conveyor izokhuphuka ibanga elimisiwe futhi iqale i-lift yesibili.Isiphakamisi ngasinye singaba nezingqimba ezimbalwa, kuye ngesivinini sento.I-lift yesibili ifana neyokuqala, njalo njalo kuze kube yilapho yonke inqwaba yakhiwe.Ingxenye enkulu yenqwaba ewumphumela iyekwa yodwa, kodwa kukhona ukuchichima emaphethelweni enqwaba ngayinye.Lokhu kungenxa yokuthi amabhande okuthutha awakwazi ukulungisa ngokuzenzakalelayo indawo yokushintsha okulinganiselwe noma izinto ezisetshenziselwa ukuwaqhuba.Iswishi yomkhawulo wokuhoxisa kufanele ilungiswe ukuze ukweqa kungangcwabi i-shaft yokudlulisa.