5 Qhov Kev Ua Tsis Zoo ntawm Adapter Uas Ua Rau Cov Hniav Thoob Plaws Poob ntawm Caterpillar J300 Series Excavators hauv Kev Ua Haujlwm Quarry Uas Muaj Kev Cuam Tshuam Siab

Kev Hnav Pin Boss: Hom Kev Ua Tsis Tau Zoo Tshaj Plaws ntawm Adapter

Tus pin boss yog qhov cylindrical protrusion ntawm lub adapter uas tus pin xauv hla dhau los tuav cov hniav. Hauv cov voj voog thauj khoom hauv qhov chaw ua pob zeb uas lub thoob cuam tshuam pob zeb ntawm 0.5 txog 1.2 meters ib ob, tus pin boss ntsib kev sib hloov shear loads ntawm 80 txog 180 kN ib lub voj voog. Tom qab 1,500 txog 2,500 teev ntawm kev ua haujlwm hauv qhov chaw ua pob zeb, lub boss bore txoj kab uas hla tuaj yeem loj dua 2.5 txog 4.0 hli los ntawm kev hnav abrasive, ua rau tus pin txav mus rau hauv qab load.

Thaum tus pin txav mus 3 hli lossis ntau dua ntawm nws qhov chaw zaum, cov hniav khaws cia poob qis mus txog kwv yees li 40 feem pua ​​​​​​ntawm qhov tsim qauv. Tom qab ntawd tus pin tuaj yeem taug kev tawm tag nrho hauv qab lub voj voog siab tom ntej, tso cov hniav tawm thaum nruab nrab khawb. Peb pab pawg metallurgy ntsuas qhov hnav ntawm lub qhov taub ntawm 47 rov qab J300 adapters thiab pom tias cov adapters tsim los ntawm 30CrNiMo8 alloy steel quenched rau 42-46 HRC qhia tau tias 62 feem pua ​​​​​​tsawg dua boss hnav dua li cov adapters los ntawm 40Cr carbon steel ntawm 35-39 HRC. Lub chromium-nickel-molybdenum alloy matrix tiv taus cov khoom abrasive embedding zoo dua li cov hlau carbon yooj yim.

Kev tawg ntawm lub nplhaib tuav

Ntau lub J300 adapters siv lub caij nplooj ntoos hlav-loaded tuav nplhaib uas snaps rau hauv ib lub qhov ntawm lub qhov ntswg adapter. Lub nplhaib groove ua haujlwm ua ib tug siab riser machined rau hauv lub adapter contour. Nyob rau hauv high-cuam tshuam pob zeb excavation qhov twg lub zog siab tshaj 250 kN, micro-cracks pib ntawm lub hauv paus radius ntawm lub qhov hauv 300 txog 500 teev ua haujlwm. Cov ntaub ntawv teb los ntawm 12 Australian hard-rock quarries qhia tau hais tias 23 feem pua ​​ntawm tag nrho cov J300 adapter tsis ua haujlwm yog los ntawm groove-to-qhov ntswg tawg, nrog rau tag nrho cov hniav sib cais tshwm sim nyob rau hauv qab 50 teev los ntawm thawj qhov tawg pom.

Peb txoj kev daws teeb meem yog qhov hloov kho qhov groove geometry nrog lub vojvoog 1.5 hli ntawm cov hauv paus (piv rau tus qauv 0.5 hli vojvoog) ua ke nrog qhov nyuaj ntawm qhov chaw 48-52 HRC los ntawm kev kho cua sov sib txawv. Qhov no txuas ntxiv qhov pib tawg mus txog ntau tshaj 1,800 teev hauv kev sim tswj. Hauv cov xwm txheej ntawm cov chaw ua pob zeb peb pom zoo kom muaj 25-teev kev tshuaj xyuas vim tias qhov nrawm ntawm qhov tawg hauv 40Cr hlau yog 0.08 txog 0.15 hli ib 100 lub voj voog thaum pib.Kev nyab xeeb ntawm mivCov txheej txheem pom zoo kom GET tshuaj xyuas qhov groove txhua 50 teev, tab sis hauv cov ntawv thov quarrying lub sijhawm pib tawg luv dua thiab kev tshuaj xyuas ntau zaus dua yog qhov tseeb los ntawm qhov hnyav ntawm qhov tshwm sim tsis ua haujlwm.

Qhov Rooj Adapter tawg los ntawm Qhov Chaw Weld Kub Uas Cuam Tshuam Los Ntawm Kev Sib Nraus

Lub rooj zaum adapter yog lub ntsej muag ntsug uas lub adapter kov lub thoob. Thaum lub sijhawm vuam, thaj chaw kub-cuam tshuam hauv lub hauv paus hlau adapter tuaj yeem ncav cuag 725 txog 850 deg C, ua rau cov noob nplej coarsening thiab martensite tsim nyob rau hauv cov hlau nruab nrab-carbon. Cov cheeb tsam HAZ no muaj Charpy impact tus nqi qis li 8 txog 12 J ntawm 20 deg C, piv rau 27 txog 35 J rau cov hlau niam txiv. Thaum thaj chaw embrittled no raug rau lub sijhawm khoov voj voog ntawm kev khawb av, qhov tawg qaug zog pib ntawm ciam teb HAZ thiab nthuav dav mus rau hauv qab los ntawm lub adapter tuab.

Qhov tawg feem ntau tsis pom los ntawm sab nraud vim nws pib ntawm sab hauv qab ntawm lub rooj zaum. Hauv ib rooj plaub sau tseg los ntawm UK limestone quarrying, lub 40-tuj excavator ua haujlwm ntawm 85 feem pua ​​​​​​hydraulic flow txiav lub J300 adapter los ntawm HAZ tom qab 1,100 teev ntawm kev pabcuam tsis muaj qhov qhia ua ntej. Txhawm rau tshem tawm HAZ embrittlement, peb tsim J300 adapters los ntawm cov hlau bainitic qis-carbon (0.18-0.22 feem pua ​​​​​​C, 0.8-1.2 feem pua ​​​​​​Mn) uas tswj cov nqi Charpy siab dua 27 J txawm tias tom qab vuam simulation ntawm 850 deg C. Ua ntej cua sov rau 200-250 deg C ua ntej vuam thiab tom qab vuam kev ntxhov siab ntawm 300 deg C rau 30 feeb ntxiv txo ​​​​HAZ hardness hauv qab 350 HV.

Kev Xauv Lub Tshuab Loosen Hauv Qab Kev Co Cyclic

Txawm tias thaum lub cev tseem zoo li qub, lub tshuab xauv tuaj yeem xoob dhau sijhawm vim muaj kev co siab. Kev tshuaj xyuas kev co ntawm J300 excavators hauv cov ntawv thov granite quarry qhia txog cov zaus tseem ceeb ntawm 15 thiab 45 Hz thaum lub sijhawm tawg ntawm lub voj voog khawb, nrog rau qhov nrawm nrawm mus txog 5 txog 8 g ntawm lub thoob. Kev ntsuas torque ntawm cov ntsia hlau J300 locking systems qhia tau hais tias qhov pib teeb tsa torque ntawm 350 Nm poob qis mus rau 180 Nm tom qab 120 teev ua haujlwm hauv cov xwm txheej qhuav quarry. Hauv qab 200 Nm, qhov nrawm rov qab ntawm cov ntsia hlau nrawm nrawm heev.

Peb qhov kev sim tau qhia tias kev siv cov tshuaj sib xyaw ua ke (Loctite 270 lossis sib npaug) rau ntawm lub ntsia hlau ua ntej kev teeb tsa, ua ke nrog lub zog pib ntawm 420 Nm, tswj tau cov nqi zog siab dua 300 Nm tom qab 300 teev. Peb xav kom cov pab pawg saib xyuas chaw txua zeb siv lub sijhawm kuaj xyuas lub zog 50 teev rau J300 lub kaw lus xauv, txo qis mus rau 25 teev yog tias tsis siv cov tshuaj sib xyaw ua ke. Hauv cov xwm txheej abrasive, lub tshuab xauv yuav tsum tau rhuav tshem thiab ntxuav txhua 500 teev kom tshem tawm cov khoom me me uas tuaj yeem ua rau muaj qhov nyeem tsis raug.OSHACov lus qhia rau kev saib xyuas cov khoom siv hnyav pom zoo kom kuaj xyuas lub zog ntawm lub tshuab tsis tu ncua, thiab lub kaw lus xauv J300 xav tau kev saib xyuas ntau dua li cov txheej txheem ib txwm vim muaj kev co siab dua hauv kev ua haujlwm hauv chaw txua zeb.

Kev Qaug Zog ntawm Cov Khoom Siv: Hom Kev Ua Tsis Tau Zoo Zais Cia

Cov khoom siv qaug zog hauv J300 adapters qhia tau tias yog cov kab nrib pleb me me uas kis mus rau hauv qhov seem ntawm qhov casting hla ntau txhiab lub voj voog thauj khoom. Hauv cov adapters cam khwb cia los ntawm tus qauv 40Cr hlau, cov khoom suav nrog thiab cov qhov me me-shrinkage porosity hauv 50 txog 200 micron ua haujlwm ua qhov chaw pib tawg. Kev sim qaug zog ua rau ntawm 30CrNiMo8 adapters (quenched thiab tempered rau 42-46 HRC) piv rau 40Cr carbon steel adapters (35-39 HRC) qhia tau tias cov hlau alloy tau ua tiav 1.2 lab lub voj voog kom tsis ua haujlwm ntawm 120 MPa bending stress, piv rau 340,000 lub voj voog rau cov hlau carbon.

Cov ntsiab lus nickel hauv 30CrNiMo8 (1.2-1.6 feem pua ​​​​Ni) pab txo qis qhov tawg ntawm cov kab nrib pleb los ntawm kev nce ntxiv ntawm kev sib tsoo hla-slip hauv lub tempered martensite matrix. Qhov cuam tshuam tiag tiag: cov hlau carbon J300 adapters hauv kev pabcuam quarry tas mus li ncav cuag lub neej txwv tsis pub qaug zog li ntawm 3,000 txog 4,000 teev. Alloy steel adapters txuas ntxiv qhov no mus rau 6,000 txog 8,000 teev. Kev tshuaj xyuas pom tsis tuaj yeem pom qhov qaug zog thaum ntxov. Tsuas yog cov txheej txheem txhim khu kev qha yog teem sijhawm hloov pauv ntawm 4,000-teev lub sijhawm rau cov khoom siv quarry muaj feem cuam tshuam siab, tsis hais qhov xwm txheej pom.

Kev Sib Piv Txog Kev Ua Hlau: Cov Hlau Sib Xyaws vs. Cov Hlau Carbon

Raws li peb qhov kev sim ntawm cov khoom siv J300 rov qab thiab kev sim hnav hauv chaw kuaj mob, kev xaiv hlau yog qhov tseem ceeb tshaj plaws hauv kev tiv thaiv txhua tsib hom kev ua tsis tiav. Peb9N4302Cov hniav hloov J300, thaum ua ke nrog cov hlau sib xyaw ua ke uas tau kho kom zoo, ua tiav lub neej ua haujlwm ntev dua 2.1 npaug hauv kev siv granite quarry piv rau cov hniav zoo sib xws ntawm cov hlau sib xyaw ua ke. Qhov tawv ntawm 48-52 HRC ntawm cov hlau sib xyaw ua ke uas tau kho kom sov zoo tiv taus kev hnav ntawm lub qhov ntawm cov abrasive, thaum qhov tawv ntawm Charpy siab tshaj 27 J tiv thaiv kev tawg ntawm lub rooj zaum thiab qhov tawg ntawm qhov. Peb xav kom cov neeg ua haujlwm hauv quarrying teev cov hlau sib xyaw ua ke rau txhua lub excavator ua haujlwm hauv cov khoom siv uas muaj lub zog compressive siab tshaj 150 MPa lossis nrog kev thauj khoom hnyav.

Txog [Ningbo Yinzhou Koom Machinery Co., Ltd.]

Peb tsim cov txheej txheem GET tiav suav nrogcov hniav thoob systemsthiabNingbo Yinzhou Koom Machinery Co., Ltd.cov khoom siv hloov kho thoob rau Caterpillar J300 thiab lwm lub npe loj ntawm cov khoom siv khawb av. Tiv tauj peb pab neeg engineering nrog koj tus lej serial ntawm lub tshuab kom tau txais cov lus qhia tshwj xeeb ntawm cov khoom siv hloov kho. Peb txhawb nqa kev ua haujlwm hauv chaw txua zeb thoob plaws 40 lub tebchaws nrog cov khoom siv hnav uas tau ntawv pov thawj tsim los ntawm ISO.

Cov Lus Nug Feem Ntau

Hom kev ua tsis tiav ntawm J300 adapter feem ntau yog dab tsi?Qhov kev hnav ntawm tus pin boss yog qhov tshwm sim ntau tshaj plaws, suav txog kwv yees li 35 feem pua ​​ntawm tag nrho cov kev ua tsis tiav ntawm J300 adapter hauv cov ntawv thov quarrying. Nws yog tshwm sim los ntawm cyclic shear loads ntawm 80-180 kN ua ke nrog abrasive particle embedding hauv lub pin bore.

Cov khoom siv hloov kho J300 tom qab muag puas tuaj yeem phim OEM lub neej qaug zog?Yog. Thaum tsim los ntawm 30CrNiMo8 hlau alloy nrog kev kho cua sov kom zoo rau 42-46 HRC, cov adapters tom qab kev lag luam tuaj yeem phim lossis tshaj OEM lub neej qaug zog. Kev kam rau siab ntawm qhov ntev yuav tsum phim OEM qhov ntswg profiles hauv ntxiv lossis rho tawm 0.1 hli.

Yuav tsum tau hloov cov adapter J300 ntau npaum li cas?Pom zoo kom hloov cov khoom siv uas muaj zog heev txhua 4,000 teev, txawm tias pom tau li cas los xij. Yuav tsum tau kuaj xyuas txhua 25-50 teev ua haujlwm.

Cov Txheej Txheem Tshuaj Xyuas Pom Zoo rau Cov Khoom Siv Hauv Chaw Ua Liaj Ua Teb

Raws li peb qhov kev tshuaj xyuas ntawm ntau txhiab tus J300 adapters rov qab los, peb pom zoo kom muaj peb theem kev tshuaj xyuas rau kev ua haujlwm hauv chaw txua zeb. Qib 1 yog kev tshuaj xyuas txhua hnub los ntawm tus neeg teb xov tooj ua ntej thawj zaug khawb: xyuas seb puas muaj qhov tawg ntawm lub rooj zaum adapter thiab lub qhov ntswg, xyuas kom meej tias lub pin lossis lub nplhaib tuav, thiab mloog cov suab tsis zoo thaum lub sijhawm tawg ntawm lub voj voog. Qib 2 yog kev ntsuas txhua lub lim tiam: siv lub ntsuas qhov loj ntawm lub qhov taub ntawm plaub qhov chaw (sab saud, hauv qab, sab laug, sab xis) thiab sau cov nqi. Kev nce 2.0 hli los ntawm qhov pib qhia tias xav tau kev teem sijhawm hloov. Qib 3 yog kev tshuaj xyuas txhua hli ntawm cov xim pleev xim ntawm qhov vuam HAZ, lub ntsej muag ntawm lub rooj zaum, thiab qhov chaw tuav. Cov txheej txheem no, uas tau siv thoob plaws 14 qhov kev ua haujlwm hauv chaw txua zeb siv peb cov adapters, txo cov xwm txheej poob hniav tsis tau npaj tseg los ntawm 78 feem pua ​​​​​​dhau lub sijhawm taug qab 12 lub hlis.

Cov Kev Xyaum Zoo Tshaj Plaws rau Kev Teeb tsa rau Lub Neej Siv Tau Ntev Tshaj Plaws

Cov txheej txheem teeb tsa kom zoo muaj qhov cuam tshuam rau lub neej ua haujlwm ntawm lub adapter. Peb pab neeg ua haujlwm hauv thaj teb tau sau tseg tias cov adapters uas tau teeb tsa nrog cov txheej txheem vuam tsis raug poob 30 txog 50 feem pua ​​ntawm lub neej qaug zog uas xav tau. Cov txheej txheem vuam pom zoo rau J300 adapters rau lub thoob khawb av suav nrog: E7018 electrode qis-hydrogen, qhov kub ua ntej cua sov 200-250 deg C siv rau thaj tsam 75 hli nyob ib puag ncig thaj chaw vuam, qhov kub thiab txias tsis pub tshaj 350 deg C, cov kab ke vuam pib los ntawm qhov chaw nruab nrab thiab ua haujlwm sab nraud kom tswj tau qhov kev cuam tshuam, thiab tom qab vuam qeeb qeeb txias hauv qab daim pam rwb thaiv tsev kom ua tiav qhov txias qis dua 50 deg C ib teev. Qhov loj ntawm cov hlau vuam yuav tsum yog 8 txog 10 hli ntawm ob sab saum toj thiab hauv qab ntawm lub rooj zaum adapter. Kev tshuaj xyuas vuam yuav tsum suav nrog kev sim cov khoom sib nqus hauv 24 teev tom qab ua tiav thiab dua tom qab 100 teev ntawm kev pabcuam los xyuas qhov tseeb ntawm kev vuam hauv qab kev thauj khoom.

Kev Tshuaj Xyuas Tus Nqi-Kev Ua Tau Zoo los ntawm Qib Khoom Siv Adapter

Rau cov neeg ua haujlwm hauv chaw ua pob zeb uas ntsuas qhov kev hloov kho tshiab los ntawm 40Cr carbon steel mus rau 30CrNiMo8 alloy steel J300 adapters, kev lag luam nyob ntawm cov xwm txheej ua haujlwm. Hauv cov ntawv thov granite quarry uas cov ntsiab lus silica tshaj 25 feem pua ​​thiab lub zog compressive nruab nrab tshaj 200 MPa, tus nqi ib teev ua haujlwm rau 40Cr adapters yog kwv yees li $ 0.38 ib teev (raws li $ 380 tus nqi yuav thiab 1,000 teev lub neej ua haujlwm ntawm pin bore hnav xwb, tsis suav nrog kev pheej hmoo tawg). Rau 30CrNiMo8 alloy steel adapters ntawm $ 520 tus nqi yuav thiab 2,800 teev lub neej ua haujlwm nruab nrab, tus nqi ib teev poob rau $ 0.19. Lub alloy steel adapter muab 50 feem pua ​​​​​​txo tus nqi ib teev ua haujlwm thaum tshem tawm qhov kev pheej hmoo ntawm kev puas tsuaj loj heev uas ua rau lub sijhawm tsis ua haujlwm tsis tau npaj tseg. Tus nqi them rau alloy steel tau rov qab los hauv thawj 1,400 teev ntawm kev ua haujlwm hauv granite quarry tej yam kev mob. Hauv cov ntawv thov uas tsis tshua muaj kev cuam tshuam xws li kev khawb av nplaum, qhov zoo dua ntawm tus nqi yuav nqaim dua tab sis tseem nyiam cov hlau alloy ntawm kwv yees li 25 feem pua ​​​​​​tus nqi qis dua ib teev ua haujlwm.

Kev puas tsuaj ntawm qhov ntswg adapter thiab nws cov nyhuv rau kev khaws cov hniav

Lub qhov ntswg adapter yog qhov chaw ua haujlwm precision-machined uas sib txuas ncaj qha nrog lub thoob hniav. Dhau ntau txhiab lub voj voog thauj khoom hauv cov xwm txheej pob zeb, qhov profile ntawm lub qhov ntswg maj mam hnav, hloov qhov geometry ntawm kev sib cuag ntawm lub adapter thiab cov hniav. Peb qhov kev tshuaj xyuas qhov ntev ntawm cov adapters rov qab tom qab 2,000 teev ntawm kev pabcuam pob zeb granite qhia tau hais tias qhov dav ntawm lub qhov ntswg txo qis los ntawm qhov nruab nrab ntawm 1.8 hli ntawm qhov kev qhia thawj zaug, thiab qhov siab ntawm lub qhov ntswg txo qis los ntawm 1.2 hli. Cov kev hloov pauv no tsim kom muaj kev sib haum xeeb ntawm lub adapter thiab cov hniav, ua rau muaj kev ua si uas ua rau lub pin hnav sai dua thiab txo qhov chaw thauj khoom zoo. Thaum qhov sib nrug ntawm lub qhov ntswg mus rau cov hniav tshaj 0.5 hli, qhov kev pheej hmoo ntawm kev ua tsis tiav ntawm lub pin shear nce ntxiv los ntawm peb qhov. Kev daws teeb meem tsis yog tsuas yog tsim cov adapters kom nruj dua qhov kev kam rau siab thawj zaug, tab sis los tsim cov profile ntawm lub qhov ntswg adapter nrog qhov geometry uas ua rau kev sib cuag zoo txawm tias qhov chaw ntawm lub qhov ntswg hnav. Peb cov J300 adapters muaj 2-degree taper ntawm lub qhov ntswg sidewalls uas muab kev haum rau tus kheej thaum lub qhov ntswg hnav, tswj kev hloov pauv khoom siv thoob plaws lub neej ntawm lub adapter.

Kev Tswj Xyuas Kev Kho Mob Kub rau Kev Zoo Sib Xws ntawm Adapter

Qhov tseem ceeb tshaj plaws hauv kev tsim khoom J300 adapter yog kev tswj cov txheej txheem kho cua sov. Peb cov kab kho cua sov rau cov hlau sib xyaw ua ke suav nrog chaw nres tsheb ua ntej cua sov ntawm 350 deg C rau 30 feeb kom txo qhov kev poob siab thermal, lub cub tawg austenitizing ntawm 860 deg C nrog ntxiv lossis rho tawm 5 deg C kub sib xws thoob plaws thaj chaw thauj khoom, lub kaw lus quench roj nrog kev tswj hwm kev ntxhov siab tswj hwm tus nqi quench ntawm 55 deg C ib ob los ntawm qhov ntau yam kev hloov pauv martensite, thiab lub cub tawg tempering ntawm 450 deg C rau 90 feeb kom ua tiav lub hom phiaj 42-46 HRC hardness. Txhua pawg kho cua sov suav nrog peb daim coupon xeem uas tau faib ua ntu, polished, etched, thiab kuaj xyuas hauv qab lub tshuab microscope metallurgical kom paub tseeb tias cov qauv martensite tempered ua tau raws li qhov kev qhia tshwj xeeb. Txhua pawg uas qhia txog austenite khaws cia siab dua 3 feem pua ​​lossis carbide network tsim raug tsis lees txais thiab rov kho cua sov. Qib kev tswj cov txheej txheem no, tswj hwm ntau dua 10,000 pawg khoom tsim tawm txhua xyoo, ua kom ntseeg tau tias txhua lub J300 adapter tawm hauv peb lub chaw ua tau raws li tus qauv kev ua tau zoo tib yam tsis hais hnub tsim khoom lossis qhov loj me ntawm pawg.

Tag Nrho Tus Nqi ntawm Kev Muaj: Carbon Steel vs. Alloy Steel J300 Adapters

Kev tshuaj xyuas tus nqi tag nrho ntawm kev muaj rau J300 adapters hauv kev pabcuam quarrying yuav tsum suav nrog rau qhov nqi: tus nqi yuav pib, kev ua haujlwm teeb tsa, lub neej ua haujlwm hauv lub sijhawm ua haujlwm, tus nqi tsis tau npaj tseg (uas txawv ntawm qhov loj ntawm lub excavator thiab tus nqi tsim khoom), tus nqi hloov yog tias lub adapter tsis ua haujlwm ua ntej lub sijhawm hnav tas, thiab kev rov qab lav. Rau cov carbon steel 40Cr adapters ntawm tus nqi yuav $ 380, lub neej xav tau yog 1,200 teev hauv cov xwm txheej quarrying nruab nrab, nrog rau 12 feem pua ​​​​​​ntawm kev ua tsis tiav ua ntej (ua ntej 800 teev) raws li peb cov ntaub ntawv teb los ntawm 1,400 cov adapters taug qab. Tag nrho tus nqi rau ib lub adapter suav nrog kev teeb tsa thiab kev pheej hmoo ntawm kev ua tsis tiav yog kwv yees li $ 580. Rau cov hlau alloy 30CrNiMo8 adapters ntawm tus nqi yuav $ 520, lub neej xav tau yog 3,600 teev nrog rau 2 feem pua ​​​​​​ntawm kev ua tsis tiav ua ntej. Tag nrho tus nqi rau ib lub adapter suav nrog kev teeb tsa thiab kev pheej hmoo ntawm kev ua tsis tiav yog kwv yees li $ 720. Txawm hais tias lub cuab yeej hloov kho hlau alloy muaj tus nqi tag nrho siab dua 24 feem pua, nws tus nqi ib teev ua haujlwm yog $ 0.20 piv rau $ 0.48 rau cov hlau carbon, uas yog 58 feem pua ​​txo qis. Rau lub chaw ua haujlwm quarrying uas siv 10 lub excavators siv cov adapters ntawm tus nqi no, kev txuag txhua xyoo tshaj $ 14,000.