Rated Lifting Capacity vs. Maximum Breakaway Force
Rated peev xwm yog qhov kev nyab xeeb ua haujlwm load (SWL) uas lub lifter tuaj yeem ntseeg tau raws li cov xwm txheej ib txwm muaj, nrog rau kev nyab xeeb ntawm 3: 1 txog 5: 1 (piv txwv li, lub zog tawg yog 3-5x rated peev). Rau 1000kg rated lifter, breakaway quab yuam yog feem ntau 3000-5000kg. Cov npoo no ua kom ntseeg tau tias txawm tias qhov hloov pauv hloov pauv lossis tus neeg teb xov tooj nrawm dua lub crane, cov hlau nplaum tsis tso tawm.
Tsuas yog siv cov lifters sib nqus nrog lub tshuab kev ruaj ntseg latch (piv txwv li, lub caij nplooj ntoos hlav -loaded nuv los yog lwm yam xauv). Txawm tias cov hlau nplaum muab tua, lub latch tiv thaiv lub load los ntawm ntog yog hais tias tus neeg teb xov tooj ntawd tsoo lub khawm tso tawm. Cov qauv kev lag luam: ASME B30.20 (hauv qab-cov-cov khoom nqa nqa) thiab EN 13155 (cranes - nqa cov hlau nplaum).
Rau cov lifters tshiab, peb muab cov ntaub ntawv pov thawj load test daim ntawv pov thawj uas qhia txog kev kuaj load ntawm 1.25x rated muaj peev xwm thov rau 5 feeb uas tsis muaj adhesion tas mus li.
Yuav ua li cas Nto Roughness thiab Air Gaps txo Magnetic Pull
Nto roughness thiab huab cua sib txawv ua rau txo cov hlau nplaum rub vim tias sib nqus quab yuam decays kwv yees li square ntawm kev ncua. Qhov sib txawv ntawm 0.2 hli huab cua (xws li, los ntawm cov xim, xeb, lossis zeb nplai) txo qis rub quab yuam los ntawm 20-30% piv rau qhov chaw tiaj tus huv si. Qhov sib txawv ntawm 1 hli huab cua txo qhov rub los ntawm 50-70%. Yog li ntawd, rau lifting daim hlau nrog hnyav xeb los yog tuab txheej (xws li, 0.5 hli epoxy xim), derate lub lifter peev los ntawm 40-50%.
Rau qhov chaw ntxhib (Ra> 25μm) lossis corrugated daim hlau, siv lub tshuab nqus hlau nrog cov lus sib dhos lossis roj hmab- ntsej muag ncej uas haum rau saum npoo. Standard rigid ncej lifters yog tsim rau hauv av los yog machined nto (Ra < 6μm).
Hom derating yam:
| Surface condition | Cua Gap (mm) | Derating Factor (ntau qhov ntsuas muaj peev xwm) |
|---|---|---|
| Ntxuav, tiaj, machined (Ra<3μm) | 0.05-0.1 | 1.0 (muaj peev xwm) |
| Sandblasted los yog maj mam pleev xim rau | 0.1-0.3 | 0.7-0.8 |
| Hnyav xeb lossis xim tuab (0.5mm) | 0.4-0.8 | 0.5-0.6 |
| ntub los yog oily nto | 0.1-0.2 | 0.8-0.9 (kev pheej hmoo poob ntxiv) |
Lifting Cylindrical Loads vs. Flat Steel Phaj
Lifting puag ncig tuav lossis kav dej txo qhov chaw sib cuag, txo qis zog rub. Rau ib lub lifter muab, lub peev xwm thauj khoom rau lub tog raj kheej yog kwv yees li 30-50% ntawm nws cov phaj tiaj tiaj. Piv txwv li, ib lub 1000kg tiaj tus-plate lifter tuaj yeem nqa tsuas yog 300-500kg ntawm 200mm txoj kab uas hla. Txhawm rau txhim kho cylindrical lifting, siv V-shaped ncej khau los yog ntau tus ncej lifters nrog articulated magnetic pads.
Rau lifting bundles ntawm rebar los yog hlau mesh, qhov zoo nto yog heev discontinuous. Tus qauv sib nqus lifters tsis pom zoo; es tsis txhob siv cov hlau nplaum lifting nrog rau qhov tob tob (piv txwv li, electromagnet nrog txuas ntxiv) los yog mechanical grabs.
Peb muab daim ntawv thov- cov rooj muaj peev xwm tshwj xeeb: rau cov qauv nqa nqa, peb sau cov kab yeeb nkab siab tshaj plaws, qhov tsawg kawg nkaus phaj thickness, thiab pom zoo cov npoo kev nyab xeeb.
Cov Txheej Txheem Kev Ua Haujlwm thiab Lub Sijhawm Calibration rau Rhiav
Kev tshuaj xyuas txhua hnub ua ntej siv:
Xyuas cov neeg kho tshuab kev nyab xeeb latch ua haujlwm dawb.
Tshawb xyuas lub ntsej muag rau cov khib nyiab, xeb, lossis puas.
Ua ib qho kev xeem nqa ntawm 50% ntawm lub peev xwm ntsuas (nqe kev thauj khoom rau 30 vib nas this, xyuas seb qhov kev swb).
Rau electromagnetic lifters, xyuas cov rwb thaiv tsev cable thiab ntsaws txuas.
Annual calibration: measure actual pull force using a calibrated dynamometer. If measured breakaway force is less than 3x rated capacity (or below manufacturer specification), return the lifter for remagnetization or replacement. Neodymium lifters typically retain 90%+ of initial strength for 10-15 years under normal use, but accidental overheating (>100 degree) lossis kev cuam tshuam loj tuaj yeem ua rau poob tsis tau.
Rau kev cob qhia siv cov lifters txhua hnub, peb pom zoo kom oiling qhov tso tawm cov ntsiab lus pivot txhua 3 lub hlis thiab ntxuav lub ntsej muag nrog cov tsis muaj - abrasive so tom qab txhua qhov ua haujlwm.
Rau hnyav- lub luag haujlwm sib nqus lifters nrog lub peev xwm ntawm 100kg txog 2000kg (los yog kev cai txog li 5000kg), thov mus saib peb cov khoom sib nqus ua haujlwm & nqa khoom ntawm peb lub vev xaib. Peb muab ob qho tib si phau ntawv nqa mus tas li (tsis muaj lub zog xav tau) thiab electro- nqa mus tas li (rau kev ua haujlwm nyob deb).
Txhawm rau thov qhov kev pom zoo ntawm qhov ntsuas qhov ntsuas raws li koj qhov kev thauj khoom raug qhov ntev, qhov chaw saum npoo, thiab crane nuv qhov siab, hu rau peb pab pawg tuav khoom. Peb muab pub dawb rau ntawm - qhov chaw sim rau cov neeg siv khoom loj.
Cov lus nug nquag
Q: Kuv puas tuaj yeem siv 1000kg magnetic lifter nqa 600kg phaj uas muaj 1 hli xim txheej?
A: Tsis yog. Tom qab derating rau 1 hli huab cua sib txawv (kwv yees li 50% txo), koj 1000kg lifter zoo lis tsuas yog 500kg ntawm pleev xim rau saum npoo. Lub 600kg phaj yog overloaded. Tshem tawm cov xim ntawm cov ntsiab lus sib cuag lossis siv lub zog siab dua - cov khoom nqa (2000kg derated rau 1000kg).
Q: Kuv yuav ua li cas thiaj paub yog tias kuv lub tshuab nqus hlau nqus tau poob lub zog dhau sijhawm?
A: Ua ib qho kev sim rub tawm: txuas lub lifter mus rau lub phaj hlau huv si, txuas lub dynamometer, thiab ntsuas lub zog uas yuav tsum tau tshem tawm lub lifter (rub tawm perpendicular). Sib piv nrog tus nqi qub breakaway quab yuam los ntawm daim ntawv pov thawj xeem. Ntau tshaj 20% poob yuav tsum muaj kev pabcuam.
Q: Puas yog cov hlau nplaum lifters muaj kev nyab xeeb rau kev nqa daim hlau (piv txwv li, ob daim hlau 20 hli daig ua ke)?
A: Tsis yog. Sib nqus teb nkag mus rau sab saum toj phaj tab sis tsis ntseeg tau tuav lub phaj thib ob vim tias huab cua sib txawv ntawm daim hlau. Ib txwm nqa daim phiaj ib zaug. Siv cov hlau nplaum tshwj xeeb cais cov hlau nplaum kom cais cov hlau nplaum ua ntej nqa.
