Poob-hauv- hnyav feeder (poob-hauv- hnyav feeder) yog lub tshuab uas muaj hopper, feeder (ib zaug thiab ob npaug-axis ntsia hlau feeder), lub cev hnyav thiab regulator. Hauv kev ua haujlwm, lub hopper, cov khoom siv thiab cov feeder hnyav ua ke tsis tu ncua. Raws li cov khoom xa tawm, ntsuas qhov tseeb qhov hnyav poob thiab muab piv rau qhov yuav tsum tau ua kom poob phaus (tus nqi teeb tsa). Lub cev tsis muaj zog (weightless feeder) tuaj yeem kho qhov sib txawv ntawm qhov teeb tsa los ntawm kev kho qhov ceev ntawm feeder. Yog li, cov khoom siv tuaj yeem noj tsis tu ncua tusyees thiab raug.
Lub cev tsis muaj zog feeder (weightless feeder) yog tsim rau cov yas granules, hmoov, calcium carbonate, talc hmoov, resin zaj duab xis hmoov granules, hmoov nplej, hmoov txhuv nplej siab, thiab lwm yam. Ntawm lawv, peb tau tsim ob hom sib txawv rau cov khoom sib txawv ntawm lub cev, uas yog, hmoov scale ( daws qhov teeb meem ntawm cov khoom noj tsis zoo pub metering), thiab cov pellet uas twb muaj lawm yuav daws tau cov teeb meem uas twb muaj lawm.
