Iyi ngowani yekuchengetedza inotengeswa mumusika wedu wekuchengetedza vashandi, ine mitengo inotangira pa3-15 yuan. Iyo inosangana nezvinodiwa zvekuchengetedza ngowani yemhando uye kuita? GB2811-2019 Mahemeti ekudzivirira emusoro anoda kuti mahemeti akajairwa aite kunyura, puncture kuramba, uye chin strap simba bvunzo uye kusangana nezvinodiwa.
Uchishandisa 5kg inodonhedza sando, kanganisa ngowani yekudzivirira kubva paurefu hwemita 1, uye simba rinopfuudzwa kune musoro mold harifanire kudarika 4900N. Panofanira kunge pasina zvidimbu zvinodonha kubva mugomba rengowani. Musoro wesando une hemispherical, ine radius ye48mm, yakagadzirwa ne45 # simbi, uye ine symmetrical uye yunifomu chimiro. Sei isingakwanise kudarika 4900N?
4900N (Newton) chikamu chesimba, icho chakaenzana ne500 kilograms yesimba (kgf).
Hukuru hwesimba iri hukuru, uye kana rikaiswa zvakananga mumusoro wemunhu, rinogona kukonzera kukuvara kwakanyanya. Zvinoenderana nemhedzisiro yekutsvaga, iyo dhizaini yakajairwa helmeti dzekuchengetedza inoda kuti irege kukuvadzwa pasi pesimba rekuita re4900N kuchengetedza musoro kubva mukukuvara.
Izvi ndezvokuti simba guru pamunhu wekervical spine ndeye 4900N, uye kudarika simba iri resimba rinogona kutungamirira kukukuvara kwekervical spine kana zvimwe migumisiro yakakomba. Pasina kuchengetedzwa kwehemeti yekuchengetedza, kana simba re4900N rinoshandiswa zvakananga kumusoro wemunhu, zvinogona kukonzera kutsemuka kwedehenya, concussion, kana kutonyanya kukanganisa uropi, kuisa upenyu pangozi.
Naizvozvo, ngowani dzekuchengetedza dzakakosha kwazvo midziyo yekudzivirira yemunhu munzvimbo yebasa, kunyanya mumamiriro ezvinhu apo kune njodzi yekudonha kwezvinhu.
Kuti unzwisise zviri nani ukuru hwesimba re4900N, inogona kufananidzwa nekushandura mayunitsi esimba. Semuenzaniso, 1 Newton inenge yakaenzana ne0.102 kilogram simba.
Saka 4900N yakaenzana nemakirogiramu angangoita mazana mashanu esimba, izvo zvakaenzana negiravhiti yehafu yetani (500 kilograms) chinhu.
Muchidimbu, 4900N isimba rakakura kwazvo iro, kana rikaiswa zvakananga mumusoro wemunhu, rinogona kukonzera kukuvara kunouraya. Ndosaka zvakare helmeti dzekuchengetedza dzichida kuve netsika dzakasimba kuti dzive nechokwadi chekuti dzinogona kuchengetedza chengetedzo yeanodzipfeka kana dzichinge dzaiswa musimba rakadaro.
Shandisa sando yesimbi inorema 3kg kudonhedza zvakasununguka uye kubaya ngowani yekudzivirira kubva paurefu hwemita imwe. Iyo koni yesimbi haifanirwe kubata pamusoro pemusoro mold, uye iyo cap shell haifanirwe kuve nechero zvidimbu zvinodonha. Iyo koni yesimbi inogadzirwa ne45 # simbi uye inorema 3kg. Chikamu chekubaya chine kona ye60 °, koni tip radius ye0.5mm, kureba kwe40mm, kureba kwe28mm, uye kuoma kweHRC45.
Kukosha kwesimba kana chirebvu tambo chakuvadzwa mudhiyagiramu ine simba yekunyura uye puncture kuramba bvunzo inofanira kunge iri pakati pe150N ne250N. Zvishongo zvekuchengetedza zvakakosha zvinodawo zvakakosha kuita zvinodiwa: lateral rigidity
Isa helmete yekuchengetedza padivi pakati pemahwendefa maviri akafuratira, nemuromo wekunze uye padyo neplate sezvinobvira: muchina wekuyedza unoshandisa kumanikidza kune ngowani yekudzivirira kuburikidza nendiro, uye iyo yakanyanya deformation haifanirwe kudarika 40mm, yakasara deformation inofanirwa. haipfuure 15mm, uye hapafanirwe kuve nemarara anodonha kubva mugomba rengowani.
Indasitiri methane flame jet nozzle inopfapfaidza murazvo webhuruu nehurefu hwe50mm. Murazvo unobata pane chivharo chevhavha kwemasekonzi gumi uye nguva yekudzima haifanirwe kudarika masekonzi mashanu. Iyo cap shell haifanirwe kupisa nepakati.
Pamusoro pezvo, pane zvinodikanwa zvekudzikira tembiricha kuramba, yakanyanya kupisa tembiricha kuramba, magetsi ekudzivirira kuita, anti-static performance, uye kuramba kune yakanyungudutswa simbi inoputika.
Nguva yekutumira: Aug-21-2024