Tema. Mashina mexanizmler teoriyasι pa`nine kirispe
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Mashina mexanizmler teoriyasi
Mexanizmlerdin` kinematikalιq sxemasιn sιzιw.
PDF created with pdfFactory Pro trial version www.pdffactory.com 10 Mexanizmnin` kinematikalιq sxemasιn sιzιw ushιn onιn` sxemasι, bas zveno koordinatasι, geometriyalιq o`lshemleri berilgen bolιwι kerek. Mexanizmnin` qozg`alιwshιlιq da`rejesi ha`m du`zilis formulasι anιqlang`annan son` uzιnlιq masshtabι koeffitsientinen paydalanιp, zvenolardιn` sιzιlmadag`ι uzιnlιqlarι anιqlanadι. Uzιnlιq masshtabι koeffitsenti to`mendegi qatnastan anιqlanadι. L haqιyqιy uzιnlιq μ = ------ = ------------------------------ (L) sιzιlmadag`ι uzιnlιq Sonι da aytιp o`tiw kerek, masshtab koeffitsientinin` san ma`nisi esaplaw ushιn qolay bolg`an sanlar qatarιnan belgilengeni usιnιs etiledi. Sιzιlma o`lshemleri anιqlang`annan son`, mexanizmnin` kinematikalιq sxemasι to`mendegi izbe-izlikte sιzιlsa maqsetke muwapιq boladι. 1. Aylanba kinematikalιq jup payda etiwshi qozg`almas zvenolar su`wretlenedi. 2. Bas zvenolar berilgen jag`daylarda sιzιladι. 3. Qalg`an zvenolardιn` jag`daylarι du`zilis formulasι izbe-izlik ta`rtibinde sιzιladι. Mιsalι, 1-su`wrette ko`rsetilgen sxemag`a qarap ha`m berilgen qatnaslarg`a tiykarlanιp terbeliwshi konveyer mexanizmnin` kinematikalιq sxemasι sιzιlsιn. Berilgeni, l o,A =80mm, l AB =160mm, l 0,03 =140mm, l 03s =60mm, l SD =180mm. Sheshiw. Mexanizmnin` jeteklewshi zvenolarι sanιn anιqlaw ushιn Chebishev formulasιnan paydalanamιz. W=3n-2p 1 -p 2 Sxemag`a qarap qozg`alιwshι zvenolar sanι n=5, to`mengi kinematikalιq juplar sanι p 1 =7 (0,A,V,S,D) joqarg`ι kinematikalιq juplar sanι p 2 =0. Bul jag`dayda W=3•5-2•7-0=1 Demek, mexanizmnin` jalg`ιz bas zvenosι bar. O`z orayι a`tirapιnda tolιq aylana alatug`ιn l zveno(krivoship) nι bas zveno dep esaplaymιz. Krivoshiptin` 0 1 tochkadan shep ta`repinde ha`m 0 q :0 3 :D tochkalardan o`tiwshi gorizontal sιzιq penen payda etken mu`yesh φ 1 =45 0 ushιn mexanizmnin` kinematikalιq sxemasιn sιzamιz. Mexanizmnin` du`zilis formulasιn anιqlaw ushιn onι Assur toparlarιna ajιratamιz. Ol 4 ha`m 5 zvenolardan ha`m de 2 ha`m 3 zvenolardan payda bolg`an eki ekinshi klass toparg`a ha`m birinshi zvenodan payda bolg`an 1 klass mexanizmge ajιraladι. Demek, mexanizmnin` du`zilis formulasι to`mendegishe boladι. I(0,I)---II(g`,q)---II(n`,o`). Sιzιlma ko`lemin esaplap alιp, sιzιlmanιn` masshtab koeffitsientin belgileymiz. L AB 160mm μ l =-------=---------=4 AB 40mm Zvenolardιn` sιzba o`lshemlerin anιqlap alamιz. L 01A 80mm (0 1 A)=----- =--------=20mm, (AB)=40mm AB 4 L 03B 120mm l 03S 60mm PDF created with pdfFactory Pro trial version www.pdffactory.com 11 (0 3 B)=------=--------=30mm, (0 3 S)=-------=-------=15mm μ l 4 μ l 4 l SD 180mm (SD)=-----=--------=45mm. μ l 4 1.Da`slep gorizontal` sιzιqta jatιwshι 1 ha`m 3 zvenolar menen aylanba kinematikalιq juplar payda etiwshi qozg`almas zvenolar belgilenedi.(2-su`wret). 2.Mexanizmnin` bas zvenosι (krivoship) gorizontal` sιzιqqa salιstιrg`anda shep ta`repinde 45 0 mu`yesh astιnda su`wretlenedi.(3-su`wret). 3.Mexanizmnin` du`zilis formulasι izbe-izligi boyιnsha krivoshipke tutastιrιwshι ha`m de ekinshi klass Assur toparιnιn` payda etiwshi 2 ha`m 3 zvenolar (AV)=40mm ha`m (0 3 B)=30mm o`lshemleri boyιnsha sιzιladι. Bunιn` ushιn A tochkadan (AV)=40mm, 0 3 tochkadan (0 3 B)=30mm radiuslar boyιnsha sιzιqlar sιzamιz. Sιzιqlardιn` kesilisiw tochkasι V nι A ha`m 0 3 ti tochkalar menen iuwrι sιzιqlar arqalι tutastιrιp 2 ha`m 3 zvenolar jag`dayιn ko`rsetemiz.(4-su`wret). 4. Mexanizmnin` payda bolg`an ha`m tamamlanbag`an tu`rine og`an tutastιrιwshι keyingi 4 ha`m 5 zvenolardan ibarat bolg`an Assur toparιn qosamιz.(1-su`wret). Bunιn` ushιn qosιlatug`ιn toparg`a tiyisli kinematikalιq juplardιn` geometriyalιq ornι anιqlanadι. S tochka menen ko`rsetigen kinematikalιq jup 0 3 B zvenoda ha`m D tochka menen ko`rsetilgen kinematikalιq jup 0 1 ha`m 0 3 tochkalardan o`tiwshi gorizontal` sιzιqta jatιwshι ma`sele sha`rtinen ma`lim. 0 3 B zvenonιn` 0 3 tochkasιnan baslap (0 3 S)=15mm aralιqta S tochka belgilenedi. Son`ιnan S tochkadan (SD)=45mm radius penen sιzιq sιzιladι. X gorizontal` sιzιq penen kesilisiw tochkasι D anιqlanadι. S ha`m D nι tutastιrιp 4 zvenonι quramιz. D tochkada aylanba kinematikalιq jup payda etiwshi polzundι ha`m onιn` bag`darlawshιsιn ko`rsetiw menen mexanizmnin` kinematikalιq sxemasιn sιzιw juwmaqlanadι. Download 0.88 Mb. Do'stlaringiz bilan baham: |
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