| Isimo sohlelo lokusebenza | fs | fL | Ngokomthetho, umthwalo omkhulu omile ukuthi ii-slewing bearukwesekwa kufanele kusetshenziswe njengenani lokubala, okumele lifake umthwalo owengeziwe nomthwalo wokuhlola. Akufakiwe kuhlelo lokusebenza kuthebula, i-static safety factor fs ingakhethwa ngokubhekisela ezimweni ezifanayo zokusebenza nezinhlelo zokusebenza kuthebula. Mf=Isikhathi sokuketula emuva ekulayisheni okungenalutho M= Umzuzu wokuphenduka we-amplitude enkulu usetshenziselwa isicelo se-static security coefficient fs ukuthatha u-1.45, ngenxa yesilinganiso esiphezulu somthwalo nezimo zokusebenza ezinzima, kungcono ukhethe ukugoqa kwemigqa eminingi.i-slewing bear. | |||
| I-crane entantayo (cargo) | 1.10 | 1.0 | ||||
| I-Mobile crane (cargo) | ||||||
| I-crane yomkhumbi wasolwandle | ||||||
| imishini yokushisela | ||||||
| Ithebula (ukusebenza okuqhubekayo) | ||||||
| Umbhoshongo crane | * Ukuzungezisa phezulu | Mf≤0.5M | 1.25 | 1.0 | ||
| 0.5M≤Mf≤0.8M | 1.15 | |||||
| Mf≥0.8M | 1.25 | |||||
| ukuzungezisa esisekelweni | 1.0 | |||||
| I-Crane ejikelezayo (umthwalo wezimpahla) | 1.15 | |||||
| I-crane yokuthutha | ||||||
| l umkhumbi Loader/unloader | ||||||
| Umshini we-Metallurgical overweight | 1.45** | 1.5 | ||||
| I-crane yeselula (bamba noma phatha umsebenzi onzima) | 1.7 | |||||
| I-Crane yokuzungeza (bamba noma i-sucker) | ||||||
| I-Bridge crane (bamba noma i-sucker) | ||||||
| I-crane entantayo (bamba noma i-sucker) | ||||||
| 2.15 | |||||
| I-Stacker-reclaimer | ||||||
| I-Cantilevered conveyor | ||||||
| Umshini we-Offshore overweight | Izinga elikhethekile | Kulezi zinhlelo zokusebenza, izimo zokusebenza ziyahlukahluka kakhulu, njengokwesekwa kwe-rotary okusetshenziselwa ukuzungezisa okungajwayelekile, ukuhlola okumile kuphela.Ngosekelo oluzungezayo olusetshenziswa ekujikelezeni okuqhubekayo kanye nokuzungeza okuphakathi, ukubalwa kwempilo okuguquguqukayo kuyadingeka. | ||||
| I-crane kaloliwe | 1.00 | |||||
| I-Deck crane (umthwalo wezimpahla) | ||||||
| Isitaki | 1.10 | |||||
| Inqola yokulethwa | ||||||
| I-excavator yezintambo/ibhakede lekhebula | 1.25 | |||||
| Ngaphansi noma kulingana ne-1.5 M3 hydraulic excavator | 1.45 | |||||
| Ngaphezu kwe-1.5 M3 i-hydraulic excavator | Izinga elikhethekile | |||||
| ladle turret | 1.75 | |||||
Qaphela: i-fL iyisici sokuphepha esiguqukayo.Kufanele isetshenziswe ngokuhambisana nejika lomthwalo oguqukayo.Ivela kokuhlangenwe nakho nasekuhlolweni.Kuyivelu eyireferensi esuselwe kubukhulu bomthwalo osebenzayo.
Isibonelo:Umdwebo we-portal crane
Indlela yokubala yomthwalo omkhulu inconywa ngale ndlela elandelayo:
Ngaphambi kokukhetha ukusekela okujikelezayo, isici sokuphepha esimile fs okufanele sicatshangelwe umsingathi kufanele sinqunywe, esingatholakala kushejuli 1. I-portal crane:fs=1.45
Uma ubuningi bomthwalo omile waziwa, ifomula yokubala yomthwalo wawo imi kanje:
1) ubukhulu bomthwalo osebenzayo wamandla omoya anamazinga ayisishiyagalombili
amandla axial Fa = Q + A + O + G
umzuzu wokugumbuqela M = Q × lmax + A × amax + W × r – O × o – G × g
2) Kungakhathaliseki amandla omoya, cabanga umthwalo wokuhlola ongu-25%.
amandla e-axial Fa = 1.25 × Q + A + O + G
umzuzu wokugumbuqela M = 1.25 × Q × lmax + A × amax – O × o – G ×
Isibonelo: umthwalo osebenzayo kanye nobukhulu bembobo ye-clamshell baziwa ngale ndlela elandelayo:
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
Umthamo omkhulu wokusebenza kwamandla omoya ezingeni 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, cabangela umthwalo omkhulu wokusebenza ongu-25% womthwalo wokuhlola
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）umthamo omkhulu wokusebenza kungakhathaliseki amandla 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
Isimo somthwalo 2 sisetshenziswa njengomthwalo osebenzayo wokubala omile
Ngokohlelo 1, i-portal crane (ibhakede lokubamba) kufanele isekelwe imigqa emithathu yokusekelwa okujikelezayo kohlobo lwe-roller:
Umthwalo wereferensi omile wosekelo lwe-rotary uthi:
Fa＇ = 1750 kN × 1.45 = 2537.5 kN M＇= 5566.3 kNm × 1.45 = 8071.1 kNm
Umthwalo wokubala webhawodi uthi:
I-Fa = 1750 kN M = 5566.3 kNm
Ngokwemiphumela yokubala engenhla, ukukhethwa kwejika lomthamo wokuthwala kunganqunywa ukukhetha ukusekelwa okujikelezayo kwe-13 *.45.2000.002
Incazelo engenhla yindlela yokubala enemininingwane yei-slewing bearusayizi.Ngokwemiphumela yokubala, ungakhetha ezifanelei-slewing bearimodeli yethuikhathalogi yomkhiqizo.Uma ungazi ukuthi ubalwa kanjani, sicela ukhululeke ukusithinta nge-imeyili.Sizokukhonza ngenhliziyo yonke!
Isikhathi sokuthumela: Apr-08-2021