| Imeko yesicelo | fs | fL | Ngokomgaqo, owona mthwalo uphezulu ongatshintshiyoibhere yokubulalainkxaso kufuneka isetyenziswe njengexabiso lokubala, elimele libandakanye umthwalo owongezelelweyo kunye nomthwalo wokuvavanya. Ayibandakanywanga kwisicelo kwitheyibhile, i-static safety factor fs inokukhethwa ngokubhekisele kwiimeko ezifanayo zokusebenza kunye nezicelo kwitheyibhile. Mf=Umva umzuzu wokubhukuqa kumthwalo ongenanto M= Umzuzu wokubhukuqa we-amplitude ephezulu isetyenziselwa isicelo se-static security coefficient fs ukuthatha i-1.45, ngenxa yomthwalo ophakathi kunye neemeko ezinzima zokusebenza, kukhethwa ukukhetha ukuqengqeleka kwemiqolo emininzi.ibhere yokubulala. | |||
| Ikhreyini edadayo (umthwalo) | 1.10 | 1.0 | ||||
| Ikhreyini ehambayo (umthwalo) | ||||||
| I-crane yedekhi yaselwandle | ||||||
| izixhobo zokuwelda | ||||||
| Itheyibhile (umsebenzi oqhubekayo) | ||||||
| Tower crane | * Ukujikeleza phezulu | Mf≤0.5M | 1.25 | 1.0 | ||
| 0.5M≤Mf≤0.8M | 1.15 | |||||
| Mf≥0.8M | 1.25 | |||||
| ukujikeleza kwisiseko | 1.0 | |||||
| Ikhreyini yokujikeleza (umthwalo womthwalo) | 1.15 | |||||
| I-crane yokuthumela | ||||||
| l ngenqanawa Umlayishi / umlayishi | ||||||
| Umatshini weMetallurgical overweight | 1.45** | 1.5 | ||||
| I-crane ehambayo (bamba okanye uphathe umsebenzi onzima) | 1.7 | |||||
| I-crane yokujikeleza (ibambe okanye ifunxe) | ||||||
| Ikhreyini yebhulorho (ibambe okanye ifunxe) | ||||||
| Icrane edadayo (ibambe okanye ifunxe) | ||||||
| 2.15 | |||||
| Stacker-reclaimer | ||||||
| Cantilevered conveyor | ||||||
| Offshore umatshini ogqithisileyo | Umgangatho okhethekileyo | Kwezi zicelo, iimeko zokusebenza ziyahluka kakhulu, njengenkxaso ye-rotary esetyenziselwa ukujikeleza okungaqhelekanga, kuphela i-static check.Ngenkxaso ejikelezayo esetyenziselwa ukujikeleza okuqhubekayo kunye nokujikeleza okuphakathi, ukubalwa kobomi obuguqukayo kuyafuneka. | ||||
| Ikhreyini kaloliwe | 1.00 | |||||
| Idekhi yecrane (umthwalo wempahla) | ||||||
| Stacker | 1.10 | |||||
| Inqwelo yokuhambisa | ||||||
| I-excavator yentambo / ibhakethi yentambo | 1.25 | |||||
| Ngaphantsi okanye ilingana ne-1.5 M3 i-hydraulic excavator | 1.45 | |||||
| Ngaphezu kwe-1.5 M3 ye-hydraulic excavator | Umgangatho okhethekileyo | |||||
| ladle turret | 1.75 | |||||
Qaphela: i-fL yinkalo yokhuseleko oluguqukayo.Kufuneka isetyenziswe ngokudibeneyo kunye negophe lomthwalo oguqukayo.Ivela kumava kunye nokulinga.Lixabiso lereferensi esekelwe kumthwalo ophezulu wokusebenza.
Umzekelo:Idayagram ye-portal crane
Indlela yokubala yobukhulu bomthwalo iyacetyiswa ngolu hlobo lulandelayo:
Ngaphambi kokukhetha inkxaso ye-rotary, i-static yokhuseleko factor fs ekufuneka ithathelwe ingqalelo kumamkeli kufuneka imiselwe, enokufumaneka kwishedyuli 1. Portal crane:fs=1.45
Xa ubuninzi bomthwalo ongatshintshiyo uyaziwa, ifomyula yokubala yomthwalo wayo ilandelayo:
1) owona mthwalo uphezulu wokusebenza kwamandla omoya amanqanaba asibhozo
amandla axial Fa = Q + A + O + G
umzuzu wokubhukuqa M = Q × lmax + A × amax + W × r – O × o – G × g
2)Nokuba unjani na amandla omoya, qwalasela umthwalo we-25% wovavanyo
amandla axial Fa = 1.25 × Q + A + O + G
umzuzu wokubhukuqa M = 1.25 × Q × lmax + A × amax – O × o – G ×
Umzekelo: umthwalo osebenzayo kunye nobukhulu bezibuko leclamshell zaziwa ngolu hlobo lulandelayo:
Q = 260 kN lmax = 23 m 1max=23m
A = 75 kN amax = 11 m amax=11m
O = 450 kN o = 0.75 m o=0.75m
G = 900 kN g = 3 m g=3m
W = 27 kN r = 6.5 m1） r = 6.5m
Owona msebenzi mkhulu womsebenzi wamandla omoya kwinqanaba lesi-8
Fa = Q + A + O + G
=260 + 75 + 450 + 900
=1685 kN
M = Q×lmax + A×amax + W×r – O × o – G× g
=260 × 23 + 75 × 11 + 27 ×6.5×450 × 0.75×900 × 3
= 3943 kNm
2) kungakhathaliseki amandla omoya, qwalasela ubukhulu bomthwalo osebenzayo we-25% yomthwalo wovavanyo
Fa = 1,25×Q + A + O + G
=325 +75 +450 +900
= 1750kN
M = 1.25×Q×lmax + A×amax – O×o – G×g
= 325 × 23 + 75 × 11×45 × 0.75×900 × 3
= 5566.3 kNm
3) owona mthwalo mkhulu wokusebenza ngaphandle kwamandla omoya
Fa = 1685 kN
M = Q×lmax + A×amax – O×o – G×g
= 260 × 23 + 75 × 11×450 × 0.75×900 × 3
= 3767.5 kNm
Imeko yomthwalo we-2 isetyenziswa njengomthwalo osebenzayo wokubala okumileyo
Ngokweshedyuli 1, i-portal crane (ibhakethi yokubamba) kufuneka ixhaswe yimiqolo emithathu yohlobo lwe-roller-type support rotary:
Umthwalo omileyo wereferensi yenkxaso ejikelezayo yile:
Fa＇ = 1750 kN × 1.45 = 2537.5 kN M＇= 5566.3 kNm × 1.45 = 8071.1 kNm
Ukubalwa komthwalo webholithi ngulo:
Fa = 1750 kN M = 5566.3 kNm
Ngokweziphumo zokubala ezingentla, ukukhethwa kwe-curve umthamo wokuthwala kunokumiselwa ukukhetha ukuxhaswa kwe-rotary ye-13 * .45.2000.002
Le nkcazo ingentla yindlela yokubala eneenkcukacha zeibhere yokubulalaubukhulu.Ngokweziphumo zokubala, unokukhetha okufanelekileyoibhere yokubulalaimodeli yethuikhathalogu yemveliso.Ukuba awuyazi indlela yokubala, nceda uzive ukhululekile ukuqhagamshelana nathi nge-imeyile.Siza kukukhonza ngentliziyo epheleleyo!
Ixesha lokuposa: Apr-08-2021