Load cell keeb kwm

Leonardo Da Vinci siv cov haujlwm ntawm calibrated counterweights ntawm lub tshuab ua kom sib npaug thiab txiav txim siab tsis paub qhov hnyav. Kev hloov pauv ntawm nws cov qauv siv ntau lub zog, txhua qhov sib txawv ntawm qhov ntev thiab sib npaug nrog ib tus qauv hnyav. Ua ntej hydraulic thiab hluav taws xob strain gauge load hlwb hloov cov tshuab levers rau kev siv cov khoom siv hnyav, cov tshuab lever nplai tau siv dav. Lawv tau siv los ntsuas txhua yam ntawm cov tshuaj mus rau cov tsheb ciav hlau thiab ua kom raug thiab ntseeg tau tias lawv tau ntsuas thiab khaws cia zoo. Lawv koom nrog kev siv lub cev ntsuas qhov hnyav lossis kev tshawb nrhiav lub zog tsim los ntawm cov tshuab levers. Qhov ntxov tshaj plaws, pre-strain gage force sensors suav nrog hydraulic thiab pneumatic tsim.

Xyoo 1843, British physicist Charles Wheatstone tau tsim ib lub voj voog uas tuaj yeem ntsuas hluav taws xob tiv thaiv. Wheatstone choj Circuit Court yog qhov zoo tagnrho rau kev ntsuas qhov kev hloov pauv uas tshwm sim hauv cov kab mob sib kis. Txawm hais tias thawj qhov kev sib raug zoo ntawm cov hlau tsis sib haum xeeb tau tsim nyob rau xyoo 1940, nws tsis yog txog thaum cov khoom siv hluav taws xob niaj hnub ntes tau tias cov thev naus laus zis tshiab tau dhau los ua thev naus laus zis thiab kev lag luam. Txij li lub sijhawm ntawd, txawm li cas los xij, strain gages tau nthuav tawm ob qho tib si raws li cov khoom siv ntsuas thiab hauv cov khoom siv ib leeg. Niaj hnub no, tshwj tsis yog rau qee lub chaw soj nstuam uas qhov kev sib npaug ntawm cov cuab yeej siv tau tseem siv tau, cov kab mob gage load hlwb tswj hwm kev lag luam hnyav. Pneumatic load cells qee zaum siv qhov kev nyab xeeb thiab kev nyiam huv hauv qhov xav tau, thiab hydraulic load hlwb raug txiav txim siab nyob rau hauv tej thaj chaw deb, vim lawv tsis xav tau lub hwj chim. Strain gage load hlwb muab qhov tseeb ntawm li ntawm 0.03% mus rau 0.25% tag nrho teev thiab tsim nyog rau yuav luag txhua daim ntawv thov kev lag luam.