Tsim cov tswv yim thiab kev siv ntau lub taub hau hnyav rau cov khoom tu tawv nqaij hauv online

Author: Smartweigh-Multihead Weighter

Lub multihead weighter tseem hu ua net hnyav tshuaj ntsuam ntsuas, ntsuas ntsuas, ntsuas qhov hnyav ntau lub taub hau, ntsuas ntsuas, thiab ntsuas ntsuas. Nws tuaj yeem faib cov khoom sib cais (cov khoom) ntawm cov tuam txhab ntim khoom ua ntej ntawm cov khoom sib txawv raws li lawv qhov zoo thiab kev kam rau siab teeb tsa qhov yuam kev. Nws muab faib ua ob pawg lossis ntau pawg. Nws yog ib tug high-ceev, high-precision online net hnyav tshuaj xyuas tsis siv neeg tshuab. Lub multihead weighter yog kev koom ua ke nrog ntau cov kab ntim khoom thiab lawv cov ntaub ntawv kev thauj mus los, thiab tuaj yeem saib xyuas cov khoom siv tsis zoo thiab cov khoom tsis tsim nyog hauv cov kab ntau lawm, thiab seb puas muaj cov khoom tsis muaj nyob hauv lub ntim. Multihead weighter yog siv dav hauv kev tshuaj xyuas qhov hnyav ntawm cov kab ntau lawm hauv cov chaw muag tshuaj, khoom noj, tshuaj nroj tsuag, dej haus, plastics, vulcanized roj hmab, thiab lwm yam.

Txhawm rau tiv thaiv cov cai raug cai ntawm cov neeg siv khoom, cov neeg ua haujlwm thiab cov neeg ua haujlwm, raws li "Kev Ntsuas Txoj Cai ntawm Cov Neeg Sawv Cev ntawm Tuam Tshoj" thiab "Kev Ntsuas rau Kev Saib Xyuas thiab Kev Tswj Xyuas Kev Ntsuas ntawm Cov Khoom Muag Khoom Muag Khoom Muag", kev soj ntsuam ntau ntawm cov khoom ntim. thiab kev soj ntsuam ntau ntawm cov ntsiab lus tshwj xeeb ntawm cov khoom ntim tau ua tiav. Cov khoom xyaw yuav tsum muaj tseeb qhia txog lawv qhov hnyav ntawm qhov hnyav, thiab qhov sib txawv ntawm qhov ntsuas qhov hnyav thiab cov khoom xyaw tshwj xeeb yuav tsum tsis pub dhau qhov kev tso cai tsis txaus. Kev tshuaj xyuas zaum kawg ntawm qhov hnyav ntawm cov khoom Nyob rau theem kawg ntawm kev tsim cov khoom, cov khoom hnyav ntawm cov khoom raug rov kuaj xyuas dua, thiab cov khoom tsis tsim nyog raug tshem tawm kom ntseeg tau tias cov khoom hnyav ntawm cov khoom qub raws li cov khoom siv. cov kev cai, uas muaj txiaj ntsig los xyuas kom muaj kev sib nrig sib cai ntawm cov neeg siv khoom thiab kev tsim khoom lag luam. Nws yog ib qho yooj yim rau kev txom nyem los ntawm kev poob qis, thiab cov tuam txhab lag luam yuav tsis raug kev puas tsuaj rau lub koob npe nrov vim yog cov neeg siv khoom tsis txaus siab lossis cov ntawv tshaj tawm. Tam sim no, multihead weighter tau muab faib ua kev soj ntsuam online thiab kev tshuaj xyuas offline. Kev saib xyuas online suav nrog hom txuas ntxiv thiab tsis sib xws, thiab kev tshuaj xyuas offline feem ntau cuam tshuam.

On-line kev soj ntsuam tas li feem ntau siv txoj siv sia siv, uas yog kev sib xyaw nrog cov kab nruab nrab thiab kev kub ceev. Online multihead weighter muaj xws li kev pub noj siv conveyor, ib txoj siv hnyav conveyor thiab ib qho kev tshem tawm txoj siv conveyor. Lub kaw lus software qhia txog kev pub mis raws li lub ntsiab tsis xws li cov kab ntau lawm, qhov ntau ntawm cov khoom, qhov ntev ntawm cov khoom thiab qhov ntev ntawm qhov hnyav siv conveyor. Qhov ceev ntawm txoj siv conveyor cais cov khoom nyob rau hauv cov kab ntau lawm, xyuas kom meej tias tsuas yog ib yam khoom yog hnyav rau ntawm qhov hnyav siv conveyor, thiab txo qhov hnyav symmetrical ntawm cov khoom nkag thiab tawm ntawm qhov hnyav siv conveyor vim qhov ceev ntawm lub hauv ntej thiab nram qab. siv conveyors yog txawv. ua mob. Rau cov khoom lag luam cylindrical lossis luv cylindrical cov khoom lag luam nrog qhov loj ntawm qhov sib piv thiab ntev thinness, vim tias tag nrho cov txheej txheem ntawm kev thauj mus los yog yooj yim tig, thiab qhov hnyav ntawm cov khoom lag luam yog lub teeb, cov khoom lag luam tsis ruaj khov raws li lub sijhawm, uas yuav ua rau muaj kev puas tsuaj rau qhov hnyav ntawm cov khoom. Cov txiaj ntsig tsis tseeb.

Tshwj xeeb tshaj yog cov khoom tu tawv nqaij (xws li eyeliner, lipstick, thiab lwm yam), uas yog me me hauv txoj kab uas hla, ntev thiab nyias, thiab tsuas yog thauj tau raws li cov lus qhia ntev thiab luv. Qhov hnyav siv conveyors yog siv rau qhov hnyav, uas yog qhov yooj yim rau kev hloov pauv thaum lub sijhawm thauj mus los tag nrho, kev cia siab tsis zoo, thiab muaj kev phom sij loj heev. loj heev. Txhawm rau kom tshem tawm qhov tsis txaus ntawm cov thev naus laus zis tam sim no, rau cov khoom tu tawv nqaij nrog txoj kab uas hla me me thiab ntev thinness, ntau lub taub hau hnyav ntawm cov khoom tu tawv nqaij cov kab ntau lawm kab teeb tsa kab siv V-groove weatherboard thiab dynamic high-ceev hnyav. technology kom tsis txhob muaj cov khoom lag luam. Ua kom muaj kev ntseeg siab ntawm tag nrho cov txheej txheem ntawm kev thauj mus los ntawm cov khoom muag, ua tiav online high-speed dynamic thiab ruaj khov hnyav, thiab xyuas kom meej qhov tseeb ntawm online net hnyav tshuaj xyuas cov khoom muag. Cov khoom tu tawv nqaij hauv online multihead weighter tsim los ntawm cov khoom tau muab tso rau hauv kev siv.

2 Cov qauv yooj yim thiab lub hauv paus ntsiab lus ntawm multihead weighter ntawm cov khoom tu tawv nqaij kab 2.1 Cov ntsiab lus 2.1.1 Cov khoom tu tawv nqaij kab ntau lub cev hnyav muaj xws li kev pub noj siv conveyor, lub cev hnyav siv conveyor, lub xov tooj ntawm tes, lub hau npog, thiab ib qho V-shaped zawj los tiv thaiv los ntawm nag Board, pub siv txoj siv sia conveyor, cov khoom siv tshem tawm, lub cev hnyav, tsis siv neeg tswj qhov system ntawm cov khoom siv hluav taws xob thiab lub suab daim npav khib, thiab lwm yam. weigher ntawm cov khoom tu tawv nqaij kab yog cais rau hauv cov neeg siv khoom kom zoo nkauj ntim lub thawv ntau lawm kab lossis software ntawm kev thauj mus los. Raws li kev sib deev muaj nuj nqi, cov khoom siv kho mob ntawm daim tawv nqaij (xws li eyeliner, lipstick, thiab lwm yam) tau ua tiav zoo rau hauv qhov hnyav siv conveyor; Thaum lub ntsuas qhov hnyav tau txais txoj hauv kev qhib sab nraud, thaum cov khoom siv hluav taws xob txawv teb chaws pom cov khoom tu tawv nqaij, qhov ntsuas qhov hnyav yog nyuam qhuav pib. , Thaum lub exported photoelectric sensor pom cov khoom tu tawv nqaij, qhov ntsuas qhov hnyav tau ua tiav, thiab cov khoom hnyav ntawm cov khoom tau txais; Thaum tus tswj qhov hnyav xaiv txoj kev qhib sab hauv, qhov nruab nrab ntawm qhov hnyav qhib tus nqi thiab qhov nruab nrab qhov hnyav ua tiav qhov pib yog preset. Thaum lub ntsuas qhov hnyav conveys Thaum lub net hnyav ntawm cov tshuaj pleev ib ce kuaj pom los ntawm lub tshuab tshaj qhov nruab nrab qhov hnyav qhib tus nqi, qhov ntsuas qhov hnyav yog pib. Thaum lub ntsuas txoj siv conveyor pom tias qhov hnyav ntawm cov tshuaj pleev ib ce qis dua qhov ntsuas qhov hnyav ntawm qhov ua tiav, qhov ntsuas qhov hnyav tau ua tiav, thiab qhov ntsuas qhov hnyav ntawm cov khoom tau txais. Tus tswj qhov hnyav txiav txim seb qhov hnyav ntawm cov khoom kuaj xyuas puas ua tau raws li tus qauv raws li qhov kev sib piv ntawm qhov ntsuas qhov hnyav ntawm tus nqi thiab tag nrho lub hom phiaj net yuag tus nqi, thiab tshem tawm cov khoom tsis ua raws li cov khoom siv tshem tawm.

Tswj qhov ceev ntawm cov khoom siv tu tawv nqaij nkag mus rau hauv daim tshev-hnyav siv conveyor raws li qhov ceev ntawm kev kho cov hlau lead-hauv txoj siv conveyor kom ntseeg tau tias tsuas muaj ib yam khoom uas yuav tsum tau kuaj xyuas ntawm daim tshev-hnyav siv conveyor, kom paub meej qhov hnyav. ntawm multihead weigher, thiab xyuas kom cov khoom noj. Tus nqi sib xws rau txoj siv conveyors, hnyav siv conveyors, thiab pub siv conveyors. 2.2 Qhov tseem ceeb Performance index 2.2.1 Workpiece specification ntawm cov khoom soj ntsuam: 200mm×φ10-30mm; 2.2.2 Ntau npaum li cas ntawm workpieces yuav tsum tau soj ntsuam; Net nyhav: 300g; 2.2.3 Raws li tus nqi ntawm workpieces yuav tsum tau soj ntsuam: 80 pieces / min; Qhov ntev ntawm txoj siv conveyor thiab tshem tawm txoj siv conveyor yog ob qho tib si 300mm, tag nrho qhov dav yog 100mm, thiab qhov siab-dav piv ntawm cov kab ntau lawm yog 750.±50 hli; 2.2.5 Siv conveyor ceev: 0.4m / s; 2.2.6 Qib raug: Ⅲ; 2.2.7 Kev soj ntsuam precision:±0.5G2.2.8 Ntsuas qhov ntsuas qhov hnyav: 5kg, kev nyab xeeb thauj khoom: 150%, qib dej tsis zoo: IP65; 2.2.9 Qhov hnyav: 500 grams; 2.2.10 Metrological verification method: dynamic metrological verification; 2.2. 11 Txoj kev tshem tawm: cua tshuab tshem tawm; 2.2.12 Hloov fais fab mov: 380V / 50Hz; 2.2.13 Cua compression: 0.4-0.7MPa; 2.3 System muaj nuj nqi 2.3.1 Lub kaw lus muaj ob txoj haujlwm ua haujlwm ntawm lub zos / chaw taws teeb tswj thiab kev tswj hwm hauv nruab nrab Cov kev sib txuas lus ntawm lub kaw lus muaj kev ua haujlwm ntawm kev cuam tshuam nrog cov kab ntau lawm. 2.3.2 Nws muaj lub luag haujlwm ntawm tsis siv neeg xoom hloov kho, tsis siv neeg xoom taug qab thiab tsis siv neeg kho.

2.3.3 Muaj cov ntaub ntawv zoo li qub, kho kom zoo dua qub, thiab muaj kev phom sij meej meej. 2.3.4 Nws muaj lub luag haujlwm ntawm kev qhib sab hauv thiab sab nraud qhib ntawm checkweighing. 2.3.5 Nws muaj cov khoom sib txawv thiab xaiv cov haujlwm, thiab tuaj yeem hloov pauv ntawm qhov xav tau.

2.3.6 Muaj tsib qhov sib faib qhov hnyav, thiab lub vijtsam zaub qhia cov ntaub ntawv tam sim ntawd. 2.3.7 Nws muaj lub luag haujlwm ntawm kev soj ntsuam hauv chav kawm, kev txheeb xyuas kev txheeb xyuas txhua hnub, kev txheeb xyuas txhua hli, thiab kev soj ntsuam mus sij hawm ntev, kev txheeb xyuas cov lej ntawm tag nrho cov khoom tsim nyog thiab tsis tsim nyog (tsis hnyav, overloaded), tus nqi ntawm cov khoom tsim nyog, thiab ntau lawm teev, thiab lwm yam, thiab lub sijhawm xa mus rau cov neeg siv khoom ntse tswj kev tswj hwm, nrog ntau yam kev txheeb xyuas cov duab kos duab thiab cov ntaub ntawv tso saib; 2.3.8 Muab cov ntaub ntawv tawm tswv yim tawm tswv yim, tswj qhov hnyav ntawm kev ntim khoom, thiab txuag cov nqi tsim nyog. 2.3.9 Nrog rau cov ntsiab lus ntawm lub tswb cov ntaub ntawv ntawm cov khoom tsis tsim nyog thiab cov kev ua txhaum ntau, cov ntaub ntawv tswj lub teeb raug xaiv.

3 Tsim kev npaj xam 3.1 Qhov ceev ntawm qhov hnyav siv conveyor yog qhov tseeb 3.1.1 Qhov ntev ntawm cov khoom kuaj xyuas cov khoom ua haujlwm L1: 200mm3.1.2 Qhov ntev ntawm qhov hnyav siv conveyor L2: 300mm 3.1.3 Cov khoom kuaj xyuas workpiece yog tsim nyog hnyav rau Qhov hnyav siv conveyor Spacing L3: L2-L1 = 100 mm 3.1.4 Raws li qhov ntau ntawm cov khoom kuaj xyuas thiab workpiece N: 80 daim / feeb 3.1.5 Raws li qhov hnyav ntawm tus kheej cov khoom ua haujlwm, lub sijhawm yuav tsum tau ua siv conveyor t: 60 / N = 0.75s3.1.6 Qhov hnyav siv conveyor kev khiav hauj lwm ceev v: (L1 + L2) / t = 0.67m / s Kev khiav hauj lwm ceev V yog 0.4m / s. 3.1.8 Cov khoom kuaj xyuas thiab cov khoom ua haujlwm yog nyob ntawm qhov hnyav siv conveyor. Tus lej piv txwv ntawm lub cuab yeej yog n: T / f = 28 (xav txog n≥20) 3.2 Qauv xaiv ntawm qhov hnyav sensor 3.2.1 Net nyhav ntawm txoj siv conveyor txee rooj G1: 3.5kg3.2.2 Tag nrho cov naj npawb ntawm qhov hnyav sensors n1: 13.2.3 Chaw thau khoom ntawm qhov hnyav sensor: G1 / n1 = 3.5kg3.2.4 Txais HBMPW6KRC3 ntau -point hnyav sensor, raws li tus qauv sensor xaiv phau ntawv qhia, xaiv qhov ntsuas ntsuas ( ntsuas ntau) ntawm 5kg. 3.3 Txoj kev tshem tawm ntawm cov khoom tsis tsim nyog yog qhov tseeb 3.3.1 Cov khoom kuaj xyuas muaj ntau cov khoom ua haujlwm. Net nyhav: 300g.<Tsib puas grams), raws li tus nqi siab, txoj kev tshem tawm yog saws: cua tshuab tshem tawm. 4 Cov qauv tseem ceeb thiab cov yam ntxwv ntawm kev ua haujlwm 4.1 Qhov hnyav siv conveyor yog tsim los ntawm lub ntsiab thiab tsav drums, kis tau tus mob siv, AC servo motors, suab card racks, thiab lwm yam. Lub ntsiab thiab tsav drums siv tag nrho cov tsim ntawm lub duav nruas nruas kom tsis txhob muaj kev taw qhia. Kev sib txawv ntawm txoj siv sib kis, Tsis tas li ntawd, tus tswv thiab qhev nruas yuav tsum ua qhov ntsuas qhov sib npaug, qib 6.3G (yuam kev 0.3g), txhawm rau tiv thaiv kev puas tsuaj ntawm kev vibration symmetry rov ntsuas qhov tseeb tshwm sim los ntawm qhov tsis sib npaug ntawm tus tswv thiab qhev nruas.

Qhov hnyav siv conveyor siv tus tsav tsheb AC servo lub cev muaj zog, uas tuaj yeem kho tam sim ntawd kev khiav hauj lwm ceev ntawm txoj siv conveyor raws li lub ntsiab tsis xws li qhov ntev thiab ntau npaum li cas ntawm lub workpiece yuav tsum tau soj ntsuam, thiaj li yuav xyuas kom meej tias tsuas yog ib yam khoom yog hnyav. nyob rau saum npoo ntawm qhov hnyav siv conveyor. Raws li cov synchronous pulley kis tau tus mob ntawm AC servo lub cev muaj zog thiab lub nruas nquag, cov kab ke sib kis tau ruaj khov thiab tsis muaj suab nrov. V-groove rain shield yog teem rau ntawm txoj siv tsav ntawm qhov hnyav siv conveyor, uas muaj peev xwm zam kom tsis txhob tig ntawm cov khoom cylindrical thaum lub sij hawm tag nrho cov txheej txheem ntawm kev thauj mus los, thiab xyuas kom meej qhov kev ntseeg tau thiab qhov tseeb ntawm qhov ntsuas qhov ntsuas qhov tseeb. Qhov hnyav siv conveyor yog nruab nrog lub npog tiv thaiv cua kom tsis txhob muaj kev puas tsuaj ntawm sab nraud cua symmetry qhov ntsuas qhov ntsuas qhov tseeb. Tsis tas li ntawd, nws tseem tiv thaiv cov neeg ua haujlwm los ntawm kov cov khoom siv hnyav hnyav, uas ua rau muaj kev phom sij rau kev ntsuas qhov ntsuas ntsuas.

Zuag qhia tag nrho tsim ntawm tenon nres yog siv ntawm qhov hnyav siv conveyor thiab lub suab daim npav ncej. Lub pob yog tsau thiab tso tawm sai sai, uas yog yooj yim rau kev tshem tawm thiab txij nkawm ntawm txoj siv conveyor. Lub ntsiab thiab tsav nruas ntawm qhov hnyav siv conveyor yog nruab nrog optical soj ntsuam fais fab hloov los xyuas seb cov khoom puas tau nkag mus rau hauv qhov hnyav siv conveyor thiab seb cov khoom puas yuav tsum tau tawm ntawm qhov hnyav siv conveyor kom paub meej tias tag nrho cov khoom nyob rau ntawm qhov ntsuas. Ua qhov ntsuas qhov ntsuas qhov ntsuas ntawm qhov hnyav siv conveyor kom paub meej qhov tseeb ntawm qhov hnyav. 4.2 Cov qauv ntawm cov khoom siv conveyor, cov khoom siv conveyor thiab cov khoom siv hnyav yog tib yam, tab sis qhov ntsuas qhov sib npaug ntawm lub ntsiab thiab cov nruas tsis ua.

4.3 Lub xovtooj ntawm tes tau txais cov qauv tsim tag nrho, uas muaj lub hauv paus npog, lub xovtooj ntawm tes, lub rooj sib txuas, thiab lwm yam. Lub hauv paus npog yog muab nrog kev tiv thaiv overpressure thauj tog rau nkoj ntsia liaj qhov rooj ncaj qha nyob rau hauv lub load cell ntawm lub hauv paus txuas, thiab Lub load cell raug teeb tsa Tom qab qhov kev kuaj bilge yog nqa tawm, thaum lub load yog nce mus rau qhov ntsuas load, cov zis ntawm qhov hnyav sensor yog 1mV. Raws li kev hloov kho ntawm lub overvoltage tiv thaiv thauj tog rau nkoj ntsia liaj qhov rooj, yog hais tias lub load yog nthuav mus tshaj lub rated load dua, cov zis ntawm lub luj sensor yog millivolts. Tus nqi volt yuav tsis hloov. Lub ntsuas qhov hnyav tau txais HBMPW6KRC3 hom ntau qhov taw qhia qhov hnyav, thiab qhov hnyav dua yog 300 hli.×300 hli. 4.4 Txoj kev tshem tawm tuaj yeem yog cua tshuab lossis lub tog raj kheej thawb raws li qhov hnyav ntawm cov khoom thiab qhov ntau, thiab lwm yam. Rau qhov hnyav ntawm cov khoom tsawg dua 500 grams, cov cua tshuab tshem tawm tuaj yeem siv tau. Cov cua tshuab tshem tawm muaj cov qauv yooj yim thiab ua haujlwm siab.

Cov cuab yeej tshem tawm yog tsau rau ntawm cov khoom siv conveyor, thiab cov khoom tsis tsim nyog (tsis hnyav thiab hnyav dhau) raug cais raws li qhov hnyav. Ntau yam khoom siv tshem tawm tuaj yeem raug xaiv los ua kom cov khoom tsis tsim nyog nkag mus rau hauv cov thawv ntim khoom, raws li qhia hauv daim duab 2. qhia. Lub thawv ntim khoom tsis tsim nyog tau txais ib qho kev sib txuas tag nrho tsim. Lub thawv ntim khoom yog nruab nrog lub qhov rooj pub mis thiab tus yuam sij, uas yog ua los ntawm cov neeg ua haujlwm puv sijhawm los xyuas kom muaj kev tswj xyuas tsim nyog rau cov khoom tsis tsim nyog. 4.5 Programmable controller yog siv rau hauv kev tswj tsis siv neeg ntawm cov khoom siv hluav taws xob, uas tau txais cov ntaub ntawv teeb liab ntawm tus neeg siv khoom cov kab ntau lawm, thiab kev tswj tsis siv neeg rau cov khoom siv hluav taws xob tau pib ua haujlwm. Tsis tas li ntawd, yog tias muaj teeb meem txhaum cai tshwm sim nyob rau hauv ntau lub taub hau hnyav ntawm cov khoom tu tawv nqaij, cov kev tawm tswv yim tsis zoo yuav raug siv. Rau cov neeg siv khoom ntau lawm kab tsis siv neeg tswj qhov system.

Thaum lub photoelectric sensor ntawm cov khoom siv conveyor pom cov khoom, lub multihead weighter ntawm cov khoom siv tu tawv nqaij ua haujlwm, thiab kev ntsuas hauv online thiab kev ntsuas ntawm cov khoom yog nqa tawm, thiab cov khoom tsis tsim nyog raug tshem tawm ntawm cov kab ntau lawm raws li cov cuab yeej tshem tawm. Cov txiaj ntsig ntawm kev txheeb xyuas ntawm qhov ntsuas qhov hnyav tau tshwm sim tam sim ntawd raws li cov ntaub ntawv tawm tswv yim, thiab qhov hnyav ntawm qhov tsim ntim tuaj yeem hloov kho. 5 Xaus Raws li lub tshuab hnyav hnyav ntawm txoj siv kev sib kis, raws li PLC tswj, cov khoom tu tawv nqaij ntawm cov kab ntau lawm nkag mus rau qhov hnyav siv conveyor raws li kev pub noj siv conveyor, thiab tus tswj qhov hnyav xaiv txoj kev qhib sab nraud lossis Txoj kev qhib sab hauv los nqa tawm cov khoom hauv online qhov hnyav thiab ntsuas kev ntsuas, qhov ntsuas qhov hnyav uas tus neeg tau txais los ntawm tus neeg tau muab piv nrog rau tag nrho lub hom phiaj net hnyav tus nqi teev ua ntej, los txiav txim seb qhov hnyav ntawm cov khoom kuaj tau raws li tus qauv, thiab cov khoom tsis sib haum yog raug tshem tawm raws li cov khoom siv tshem tawm, thiab tag nrho cov txheej txheem ua tiav yam tsis muaj kev cuam tshuam tib neeg. Ua tiav kev soj ntsuam qhov hnyav, ntxiv rau, cov txiaj ntsig kev txheeb xyuas cov txiaj ntsig ntawm qhov ntsuas qhov hnyav yuav tshwm sim hauv lub sijhawm raws li cov ntaub ntawv tawm tswv yim, thiab qhov hnyav ntawm lub ntim tsim yuav raug tswj kom tsim nyog tswj tus nqi.

Cov khoom lag luam no tsim nyog rau kev saib xyuas online ntawm qhov hnyav ntawm cov khoom lag luam hauv kev lag luam tshuaj, khoom noj, tshuaj nroj tsuag, dej haus, khoom tu tawv nqaij, plastics, thiab vulcanized roj hmab.

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