Keeb kwm ntawm Bulldozer Development

Lub tsheb laij teb-hom tsheb laij teb (tseem hu ua crawler dozer) tau ua tiav los ntawm American Benjamin Holt hauv xyoo 1904. Nws tau tsim los ntawm kev txhim kho cov cuab yeej siv tsheb thauj khoom nyob rau hauv pem hauv ntej ntawm lub tsheb laij teb crawler. Lub zog thaum ntawd yog lub tshuab hluav taws xob. Tom qab ntawd, crawler bulldozers uas tau tsav los ntawm cov roj av thiab cov roj av cav tau ua tiav tiav. Lub bulldozer hniav kuj tsim los ntawm phau ntawv nqa mus rau hlau hlua nqa. Benjamin Holt kuj yog ib tus tsim ntawm Caterpillar Inc. hauv Tebchaws Meskas. Xyoo 1925, Holt Manufacturing Company thiab CL Best Bulldozer Company tau koom ua ke los tsim Caterpillar Bulldozer Company, dhau los ua lub ntiaj teb thawj cov khoom siv bulldozer. Nyob rau hauv 1931, thawj batch ntawm 60 bulldozers siv diesel xyaw tau ua tiav tiav. Nrog rau kev nce qib ntawm kev siv thev naus laus zis, tsheb bulldozers yog txhua yam siv los ntawm lub tshuab hluav taws xob, thiab lub tshuab bulldozer thiab ripper yog txhua tus nqa los ntawm hydraulic thooj voos kheej kheej. Ntxiv rau cov bulldozers, tseem muaj log tsheb bulldozers, uas tshwm sim li kaum xyoo tom qab crawler bulldozers. Vim hais tias crawler bulldozers muaj kev ua tau zoo dua adhesion thiab tuaj yeem siv ntau dua traction, ntau thiab ntau ntawm crawler bulldozers deb tshaj cov log tsheb bulldozers hauv tsev thiab txawv teb chaws. Caterpillar yog lub ntiaj teb loj tshaj plaws kev tsim kho tshuab chaw tsim khoom. Nws crawler bulldozers suav nrog 9 series, D3-D11, loj, nruab nrab thiab me. Qhov loj tshaj plaws yog D11 RCD, nrog lub cav diesel flywheel lub zog ntawm 634kw. Komatsu ntawm Nyiv qeb thib ob. Nws pib qhia thiab tsim D50 crawler bulldozers nyob rau hauv 1947. Muaj 13 series ntawm crawler bulldozers, los ntawm D21 mus rau D575. Qhov tsawg tshaj plaws yog D21, nrog lub tshuab hluav taws xob diesel flywheel ntawm 29.5kw, thiab qhov loj tshaj plaws yog D575A-3SD, nrog lub cav diesel flywheel ntawm 858kw. Nws kuj yog qhov loj tshaj plaws bulldozer nyob hauv lub ntiaj teb. Lwm qhov tshwj xeeb bulldozer chaw tsim tshuaj paus yog Liebheer ntawm lub teb chaws Yelemees. Tag nrho nws cov bulldozers yog tsav los ntawm hydrostatics. Tom qab ntau tshaj kaum xyoo ntawm kev tshawb fawb thiab kev tsim kho, tus qauv tau tsim tawm hauv xyoo 1972, thiab kev tsim khoom loj ntawm PR721-PR731 thiab PR741 tau pib xyoo 1974. Lub zog siab tshaj plaws ntawm lub tshuab hluav taws xob uas tau tsav lub tshuab nqus tsev twj tso kua mis tam sim no tsuas yog 295Kw vim qhov txwv ntawm hydraulic Cheebtsam. Tus qauv yog PR751 rau mining.