Layin roba yana maye gurbin layin ƙarfe na manganese a hankali. Yana iya ɗaukar ƙarfin juriya. Yawan da'irar niƙanka ya dogara sosai akan layin roba na injin niƙanka. Zaɓi madaidaicin mai samar da layin robarka a hankali zai tabbatar da cewa tsarin niƙanka yana aiki a matsakaicin ƙarfin da ake buƙata.
Layin roba yawanci ya dace da niƙa mai danshi, zafin jiki bai wuce digiri 80 na aiki na yau da kullun ba, amma don niƙa busasshen zafi mai zafi, juriyar acid mai ƙarfi da Alkali, juriyar mai da sauran yanayi na musamman, ana buƙatar a yi bayani a gaba ta hanyar dabarar ƙira daban kuma an yi ta musamman, ban da haka, dole ne a sanya tsarin ajiya a cikin wurin da ya dace na cikin gida, yana nufin layin robar don hana fallasa waje a ƙarƙashin zafin jiki da ruwan sama.

Dangane da manufar, an raba layukan robar da ake amfani da su a cikin: AG, SAG, ball, pebble, rod & batch mills, FGD, SMD da ci gaba da niƙa.
Dangane da siffar, an raba shi zuwa nau'in ambaliya, nau'in grid da nau'in bin-bin-da yawa, wanda zai iya biyan buƙatun niƙa mai mataki ɗaya da niƙa mai matakai biyu.
Za mu iya keɓance kowane nau'in roba mai inganci da juriya ga lalacewa bisa ga buƙatun kowane abokin ciniki.

Siffofi
1. Ƙarancin amfani da makamashi
2. Juriyar lalacewa mai yawa
3. Ƙarancin kulawa
4. Juriyar tasiri
5. Ƙarancin hayaniya
6. Mai sauƙin shigarwa
7. Mai jure lalata
8. Ajiye ƙwallon ƙarfe

① Sandunan Lifter
Sandunan Lifter suna samuwa a fannoni daban-daban, faɗi, tsayi, da kuma siffofi na roba ko na haɗaka. Sandunan Lifter waɗanda suka haɗa da abin saka ƙarfe an tsara su ne don samar da matsakaicin tasiri da juriya ga gogewa.
② Ciko da Sassan Kusurwa
An tsara sassan cikawa da kusurwa don kulle faranti na kai da faranti na grate a wurin da suke da kuma dakatar da gudu a kusurwoyin.
③ Faranti na Kai
Faranti na kai na roba suna samuwa a cikin ƙira daban-daban don magance gogewar zamiya. An ƙera faranti na kai don sauƙaƙa shigarwa da sarrafawa.
④ Faranti na Grate
Ana samun ƙirar faranti masu nauyi na Grate ga manyan injinan niƙa. Ƙarfin roba na roba yana ba da damar ƙananan ramuka fiye da raga na ƙarfe yayin da yake kawar da matsalolin makanta. Akwai shi a cikin girman buɗewa daban-daban.
⑤ Maƙallan Tsakiya & Rufin Bakin Trunnion & Bell
Ana iya tsara Cones na tsakiya a sassa daban-daban domin sauƙin shigarwa.
Rufin Bakin Trunnion & Bell
Ana yin layukan Trunnion daga tushen ƙarfe da aka ƙera, wanda daga nan ake yin layi da roba. Ana kuma amfani da layukan roba masu sassauƙa waɗanda aka yi da ƙarfe a cikin manyan layukan Trunnion da Bell Mouth.
⑥ Masu ɗaga ɓangaren litattafan almara na waje
⑦ Masu ɗaga ɓangaren litattafan ciki
An ƙera na'urorin ɗagawa na roba don samar da isasshen fitar da ɓawon ta cikin injin niƙa domin rage wuyan kwalba.
⑧ Faranti na Shell
Kauri na faranti na harsashi na iya bambanta domin ƙara ƙarfin injin niƙa da/ko tsawon rai. An tsara faɗin don samun kariya mafi kyau daga sandunan ɗagawa.

Ma'aunin Halayen Jiki

Duk kwanakin suna cikin ƙa'idar yau da kullun kuma tuntuɓi masana'anta don samun keɓancewa ta musamman.