Hauv cov tshuab ua kua dej, cov roj hmab hose feem ntau ua haujlwm zoo tshaj plaws. Nws yuav tsum tau flex ib ncig ntawm lub tshuab, ua siab ntev surges nyob rau hauv lub siab nyob rau hauv lub sab hauv, thiab uphold ib tug leak- tiv thaiv kev twb kev txuas nrog hlau fittings. Thaum cov engineers nyiam hais txog hom polymer (xws li EPDM lossis NBR) lossis cov txheej txheem txhawb nqa, feem ntau cov txheej txheem tseem ceeb tau saib xyuas: Shore A hardness ntawm cov khoom siv roj hmab. Xaiv lub hose uas muag heev tuaj yeem ua rau kinking thiab sib tsoo nyob rau hauv lub tshuab nqus tsev, thaum xaiv rau ib qho uas nyuaj heev tuaj yeem ua rau tsis ua hauj lwm hauv kev sib txuas lossis tsis txaus hloov hauv cov xwm txheej txias.
Comprehending Shore Ib Hardness (Durometer)
Roj hmab hardness raug soj ntsuam siv lub durometer, feem ntau ua raws li ASTM D2240 lossis ISO 48-4 cov lus qhia. Rau elastomers, "Shore A" nplai yog universally lees paub raws li kev lag luam benchmark. Qhov ntsuas no txawv ntawm 0 mus rau 100, nrog cov nqi qis dua sawv cev rau cov ntaub ntawv softer, ntau elastic thiab cov nqi siab dua qhia tias cov khoom hnyav dua.
Hauv kev tsim cov hoses, hardness tshwj xeeb yog hais txog cov roj hmab saum npoo tsis kam rau indentation. Txawm li cas los xij, rau qhov ua tiav hose, qhov ntsuas qhov saum npoo no cuam tshuam rau tag nrho cov khoom siv ntawm ob lub raj thiab nws lub hau. Feem ntau cov roj hmab hoses muaj categorized nyob rau hauv 50A rau 90A spectrum.
Mechanical Balance: Flexibility vs Structural Integrity
Qhov kev xaiv ntawm hardness yog ib qho kev sib haum xeeb ntawm ob qhov kev xav ntawm lub cev tsis sib haum:
1. Flexibility thiab Bending Radius:Ib qho softer roj hmab formulation (50A-60A) tso cai rau lub hose kom yooj yim deform. Qhov no yog qhov tseem ceeb rau cov ntawv thov uas yuav tsum muaj lub vojvoog khoov nruj los yog rau qhov xwm txheej uas cov neeg ua haujlwm yuav tsum tau kho lub hose hauv qhov chaw nruj. Lub durometer qis dua txo qhov "force-rau- khoov," txo kev ntxhov siab ntawm cov ntsiab lus sib txuas.
2. Siab thiab Kink Resistance:Ntawm qhov tod tes, lub firmer compound (70A-80A) muaj kev txhawb nqa zoo tshaj plaws. Thaum lub hose ntsib lub siab sab hauv lossis sab nraud compressive zog, lub hardness ntawm cov roj hmab pab khaws cia lub voj voog ntawm tus ntoo khaub lig-section. Yog hais tias cov roj hmab yog mos heev, lub hose yuav "kink" (collapse hauv zos) thaum khoov, ua rau muaj kev cuam tshuam thiab tsim kom muaj kev ntxhov siab uas tuaj yeem ua rau tsis ua haujlwm ntxov.
Standard Hardness Range rau Industrial Hoses
Cov kev lag luam sib txawv tau tsim "benchmark" hardness qib raws li cov haujlwm tseem ceeb ntawm hose:
|
Hom ntawv thov |
Hom Shore A Range |
Qhov Tseem Ceeb |
|
Pneumatic / Cua Kab |
65A - 75A |
Sib npaug ntawm kev yooj yim routing thiab siab -siab tuav. |
|
Kev Hloov Dej (Tsev/Agricultural) |
60A - 70A |
Tsom ntsoov rau qhov yooj thiab yooj yim ntawm coiling. |
|
Roj thiab roj Suction |
70A - 80A |
Kev tiv thaiv kom tawg nyob rau hauv lub tshuab nqus tsev thiab o. |
|
Sandblast / Slurry Hoses |
60A - 65A |
Softer inner tubes nqus kinetic zog los ntawm abrasives. |
|
Siab -Hydraulic siab |
80A - 90A |
Maximizing qhov ruaj khov ntawm qhov kev txhawb nqa - roj hmab daim ntawv cog lus. |
Yuav Ua Li Cas Hardness Influences Coupling Retention
Lub ntsiab tseem ceeb ntawm kev tsim hose yog kev sib cuam tshuam ntawm cov roj hmab thiab cov barbed lossis crimped haum.
Yog hais tias cov khoom siv roj hmab yog nruj heev (siab dua 85A), nws yuav tsis zoo "ntws" rau hauv cov barbs ntawm kev sib txuas thaum lub sij hawm crimping. Qhov no tuaj yeem ua rau muaj kev sib txuas uas nyob ntawm kev sib txhuam nkaus xwb, uas yuav ua rau "tshuab- tawm" thaum nyob hauv siab. Tsis tas li ntawd, cov sib txuas nyuaj dua yuav muaj "kev ntxhov siab tawg" ntawm tus Tsov tus tw ntawm kev sib txuas.
Hloov pauv, yog tias cov roj hmab yog mos heev (qis dua 50A), nws tuaj yeem ua kom pom qhov "txias ntws" lossis kev deformation mus tas li. Nyob rau hauv lub siab sib xws los ntawm lub tes tsho crimp, cov roj hmab hloov mus deb ntawm lub siab taw tes raws li lub sij hawm mus, ua rau ib tug loosening kev twb kev txuas thiab tom qab xau. Rau feem ntau cov kev lag luam teeb tsa, lub puab raj hardness ntawm 70A ± 5 yog suav tias yog qhov zoo tagnrho "sealing" durometer.
Environmental Influences thiab Hardness Variation
Nws yog ib qho tseem ceeb kom nco ntsoov tias Shore A hardness tau sau tseg rau ntawm daim ntawv teev cov ntaub ntawv yog ntsuas ntawm qhov kub thiab txias (23 degree). Hauv cov xwm txheej ua tau zoo, cov xwm txheej ib puag ncig ua rau "hardness variation":
• Thermal Influences:Thaum kub nce, roj hmab softens, thaum nws hardens thaum kub txo. Lub hose ntsuas ntawm 70A tuaj yeem hnov zoo li 90A hose nyob rau hauv huab cua txias heev ntawm Arctic, ua kom tsis yooj yim thiab ua rau tawg.
• Tshuaj Expansion:Yog tias cov khoom siv hose tsis sib haum nrog cov kua dej (xws li, NBR hauv cov roj uas muaj ntxhiab tsw), cov kua dej tuaj yeem nkag mus rau cov qauv roj hmab. Qhov no infiltration ua rau roj hmab o, txo nws cov hardness thiab impairing lub structural kev ncaj ncees ntawm lub hose phab ntsa.
• UV thiab Ozone Deterioration:Kev raug tshav ntuj ntev ua rau tus ntoo khaub lig-txuas hauv qee cov polymers (xws li NR lossis SBR), uas ua rau "nto hardening." Qhov kev nce hauv durometer no feem ntau yog qhov taw qhia thawj zaug uas lub hau npog yog ze rau qhov kawg ntawm nws lub neej muaj txiaj ntsig.
Cov txheej txheem xaiv
Txhawm rau xaiv qhov tsim nyog Shore A hardness, xav txog plaub cov lus nug no thaum lub sij hawm tsim qauv:
1. Dab tsi yog qhov tsawg tshaj plaws khoov vojvoog?Yog tias lub vojvoog qis dua 10 npaug ntawm txoj kab uas hla sab hauv, xav txog kev siv cov khoom siv softer los yog corrugated phab ntsa tsim.
2. Puas yog npaj rau kev nqus los yog tawm?Suction hoses yuav tsum muaj zog dua (los yog cov hlau txuas sab hauv) kom tsis txhob tawg nyob rau hauv lub tshuab nqus tsev.
3. Txoj kev sib dhos yog dab tsi?Paub meej tias qhov hardness tso cai rau kom txaus compression raws li koj qhov tshwj xeeb crimping lossis clamping apparatus.
4. Qhov kev khiav hauj lwm kub yog dab tsi?Yog tias ua haujlwm nyob rau hauv qhov chaw txias heev, xaiv qhov sib xyaw ua ke uas suav nrog - kub plasticizers qis kom ntseeg tau tias durometer tseem ua haujlwm.
Kev xav zaum kawg
Xaiv qhov haum Shore A hardness muaj ntau tshaj li qhov hose "xav" rau qhov kov; nws encompasses kev xav ntawm mechanical stability, sealing efficiency, thiab ntev. A 70A durometer yog qhov ntsuas kev lag luam rau qhov laj thawj, vim tias nws ua rau muaj kev sib npaug zoo rau ntau daim ntawv thov hloov dej. Txawm li cas los xij, rau ib puag ncig tshwj xeeb xws li abrasive, siab - siab, los yog cryogenic tej yam kev mob, lub hardness yuav tsum tau zoo calibrated.
Qingdao Bright Rubber & Yas Co., Ltd. tsom rau kev cai roj hmab compounding. Peb muaj peev xwm hloov kho Shore A hardness ntawm NBR, EPDM, Silicone, thiab FKM hoses kom ua raws li koj cov kev xav tau tshwj xeeb engineering. Rau qhov kev ntsuam xyuas ntawm koj cov hose specifications tam sim no, thov qhia koj cov kev khiav hauj lwm siab, qhov kub thiab txias, thiab coupling hom nrog peb pab neeg engineering.
