{"id":1348,"date":"2026-06-25T06:21:24","date_gmt":"2026-06-25T06:21:24","guid":{"rendered":"https:\/\/worm-and-worm-wheel.com\/?p=1348"},"modified":"2026-06-25T06:21:24","modified_gmt":"2026-06-25T06:21:24","slug":"worm-and-worm-wheel-for-overhead-crane-and-hoist-drives","status":"publish","type":"post","link":"https:\/\/worm-and-worm-wheel.com\/cs\/worm-and-worm-wheel-for-overhead-crane-and-hoist-drives\/","title":{"rendered":"\u0160nek a \u0161nekov\u00e9 kolo pro pohony mostov\u00fdch je\u0159\u00e1b\u016f a kladkostroj\u016f"},"content":{"rendered":"
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Korea Ever-Power \u00b7 Pr\u016fvodce aplika\u010dn\u00edm in\u017een\u00fdrstv\u00edm<\/p>\n

\u0160nek a \u0161nekov\u00e9 kolo pro pohony mostov\u00fdch je\u0159\u00e1b\u016f a kladkostroj\u016f<\/h1>\n

\u0160nekov\u00fd p\u0159evod je\u0159\u00e1bu, kter\u00fd nedr\u017e\u00ed, je je\u0159\u00e1b, kter\u00fd uvoln\u00ed svou z\u00e1t\u011b\u017e. Ka\u017ed\u00fd \u010dlov\u011bk stoj\u00edc\u00ed pod zav\u011b\u0161en\u00fdm nosn\u00edkem, c\u00edvkou nebo formou sv\u011b\u0159uje sv\u016fj \u017eivot samosvorn\u00e9mu prahu jednoho p\u00e1ru ozuben\u00fdch kol. Klasifikace pracovn\u00edch skupin dle metody kone\u010dn\u00fdch prvk\u016f (FEM) existuje proto, aby dan\u00fd p\u00e1r ozuben\u00fdch kol odpov\u00eddala n\u00e1ro\u010dnosti \u017eivotnosti je\u0159\u00e1bu \u2013 a nespr\u00e1vn\u00fd v\u00fdb\u011br skupiny znamen\u00e1 bu\u010f nadm\u011brn\u00e9 v\u00fddaje, nebo nedostate\u010dnou ochranu.<\/p>\n

Promluvte si s technikem pohonu je\u0159\u00e1bu \u2192<\/a><\/p>\n<\/div>\n

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Rychl\u00e1 odpov\u011b\u010f<\/div>\n

V\u0161echny p\u00e1ry \u0161nekov\u00fdch p\u0159evod\u016f je\u0159\u00e1b\u016f a kladkostroj\u016f mus\u00ed b\u00fdt jednor\u00e1zov\u00e9 se siln\u00fdm samosvorn\u00fdm mechanismem (\u00fahel stoup\u00e1n\u00ed 2 a\u017e 5 stup\u0148\u016f) a samostatnou mechanickou brzdou jako redundantn\u00ed brzdou. Specifikace je zakotvena v klasifikaci pracovn\u00edch skupin FEM (ISO 4301), kter\u00e1 mapuje intenzitu pou\u017e\u00edv\u00e1n\u00ed je\u0159\u00e1bu s provozn\u00edm faktorem, druhem materi\u00e1lu, intervalem kontrol a konstruk\u010dn\u00ed \u017eivotnost\u00ed. Skupina FEM 1Bm (d\u00edlensk\u00fd je\u0159\u00e1b, 200 hodin ro\u010dn\u011b) vy\u017eaduje SF 1,5 a standardn\u00ed materi\u00e1ly. Skupina FEM 4m (p\u00e1nvov\u00fd je\u0159\u00e1b pro ocel\u00e1rnu, 4 000 hodin ro\u010dn\u011b) vy\u017eaduje SF 2,5, odst\u0159ediv\u011b lit\u00fd bronz a 6m\u011bs\u00ed\u010dn\u00ed intervaly kontrol. Faktor r\u00e1z\u016f p\u0159i nouzov\u00e9m zastaven\u00ed pro v\u0161echny pohony je\u0159\u00e1bov\u00fdch kladkostroj\u016f je 2,5 a\u017e 3,0n\u00e1sobek jmenovit\u00e9ho momentu \u2013 tento jedin\u00fd p\u0159echodn\u00fd jev je \u010dasto z\u00e1vazn\u00fdm omezen\u00edm velikosti, nikoli ust\u00e1len\u00fd zvedac\u00ed moment. N\u00e1mo\u0159n\u00ed a p\u0159\u00edstavn\u00ed je\u0159\u00e1by p\u0159id\u00e1vaj\u00ed k mechanick\u00e9 specifikaci po\u017eadavky na odolnost proti korozi (hlin\u00edkov\u00e9 bronzov\u00e9 kolo, nerezov\u00fd nebo pozinkovan\u00fd \u0161nek).<\/p>\n<\/div>\n

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Pro\u010d se je\u0159\u00e1bov\u00e9 kladkostroje spol\u00e9haj\u00ed na samosvorn\u00e9 \u0161nekov\u00e9 p\u0159evodovky<\/h2>\n

Ka\u017ed\u00fd mostov\u00fd je\u0159\u00e1b, port\u00e1lov\u00fd je\u0159\u00e1b, oto\u010dn\u00fd je\u0159\u00e1b a p\u0159enosn\u00fd kladkostroj, kter\u00fd zved\u00e1 b\u0159emeno nad \u00farove\u0148 ter\u00e9nu, spl\u0148uje jeden spole\u010dn\u00fd bezpe\u010dnostn\u00ed po\u017eadavek: b\u0159emeno nesm\u00ed spadnout, pokud dojde k v\u00fdpadku pohonu. Tento po\u017eadavek ur\u010duje v\u00fdb\u011br pohonu je\u0159\u00e1bov\u00e9ho kladkostroje ji\u017e v\u00edce ne\u017e stolet\u00ed a \u0161nekov\u00fd p\u0159evod z\u016fst\u00e1v\u00e1 dominantn\u00edm \u0159e\u0161en\u00edm, proto\u017ee poskytuje mechanick\u00e9 samosvorn\u00e9 mechanismy jako inherentn\u00ed geometrickou vlastnost, nikoli jako dopl\u0148kov\u00fd prvek.<\/p>\n

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Fyzika je jednoduch\u00e1: zav\u011b\u0161en\u00e9 b\u0159emeno p\u016fsob\u00ed na h\u0159\u00eddel bubnu kladkostroje konstantn\u00edm gravita\u010dn\u00edm momentem. Pokud dvojice ozuben\u00fdch kol mezi motorem a bubnem umo\u017e\u0148uje zp\u011btn\u00e9 ot\u00e1\u010den\u00ed (zp\u011btn\u00fd pohon), b\u0159emeno zrychluje sm\u011brem dol\u016f. Jednochod\u00e1 \u0161nekov\u00e1 p\u0159evodovka s \u00fahlem stoup\u00e1n\u00ed men\u0161\u00edm ne\u017e \u00fahel t\u0159en\u00ed se fyzicky nem\u016f\u017ee ot\u00e1\u010det zp\u011bt \u2013 t\u0159en\u00ed v m\u00edst\u011b kontaktu zub\u016f p\u0159ekra\u010duje hnac\u00ed slo\u017eku gravita\u010dn\u00ed s\u00edly a syst\u00e9m se zablokuje.<\/p>\n

Tato geometrick\u00e1 blokovac\u00ed funkce je nez\u00e1visl\u00e1 na elektrick\u00e9 energii, stavu \u0159\u00eddic\u00edho syst\u00e9mu ani stavu brzd. Funguje i v p\u0159\u00edpad\u011b selh\u00e1n\u00ed v\u0161ech ostatn\u00edch bezpe\u010dnostn\u00edch syst\u00e9m\u016f \u2013 proto ji normy pro je\u0159\u00e1by (EN 13001, ISO 4301, pravidla FEM) pova\u017euj\u00ed za prim\u00e1rn\u00ed p\u0159\u00eddr\u017en\u00fd mechanismus a vy\u017eaduj\u00ed samostatnou mechanickou brzdu pouze jako redundanci.<\/p>\n<\/div>\n

\"Princip<\/div>\n<\/div>\n

\u0160roubov\u00e9 p\u0159evodov\u00e9 dvojice nab\u00edzej\u00ed \u00fa\u010dinnost p\u0159es 95 procent, ale nemohou se samosvorn\u00e9 \u2013 ka\u017ed\u00fd kladkostroj se \u0161roubov\u00fdm p\u0159evodem je zcela z\u00e1visl\u00fd na elektricky uvol\u0148ovan\u00e9 brzd\u011b jako jedin\u00e9m p\u0159\u00eddr\u017en\u00e9m mechanismu. Planetov\u00e9 soukol\u00ed jsou podobn\u011b neblokovateln\u00e9. \u0160nekov\u00fd p\u0159evodov\u00fd p\u00e1r s \u00fa\u010dinnost\u00ed 40\u201355 procent je nejm\u00e9n\u011b \u00fa\u010dinnou mo\u017enost\u00ed, ale je to jedin\u00e1 mo\u017enost, kde samotn\u00e1 geometrie zabra\u0148uje p\u00e1du b\u0159emene. U je\u0159\u00e1bov\u00fdch aplikac\u00ed tato bezpe\u010dnostn\u00ed vlastnost p\u0159eva\u017euje nad ztr\u00e1tou \u00fa\u010dinnosti, proto\u017ee d\u016fsledek selh\u00e1n\u00ed (p\u00e1d b\u0159emene, potenci\u00e1ln\u00ed smrteln\u00e1 nehoda) p\u0159evy\u0161uje jak\u00e9koli n\u00e1klady na energii.<\/p>\n

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Pracovn\u00ed skupina FEM \u2013 mapov\u00e1n\u00ed vyu\u017eit\u00ed je\u0159\u00e1bu na specifikaci p\u00e1ru \u0161nekov\u00fdch p\u0159evod\u016f<\/h2>\n

Klasifika\u010dn\u00ed syst\u00e9m Federation Europeenne de la Manutention (FEM), p\u0159evzat\u00fd do normy ISO 4301, rozd\u011bluje je\u0159\u00e1by do pracovn\u00edch skupin na z\u00e1klad\u011b dvou faktor\u016f: celkov\u00e9ho po\u010dtu provozn\u00edch cykl\u016f b\u011bhem konstruk\u010dn\u00ed \u017eivotnosti je\u0159\u00e1bu a spektra zat\u00ed\u017een\u00ed (jak\u00fd pod\u00edl v\u00fdtah\u016f je na \u00farovni bezpe\u010dn\u00e9ho pracovn\u00edho zat\u00ed\u017een\u00ed nebo v jej\u00ed bl\u00edzkosti oproti lehk\u00e9mu zat\u00ed\u017een\u00ed). Pracovn\u00ed skupina p\u0159\u00edmo ur\u010duje provozn\u00ed faktor, druh materi\u00e1lu a pl\u00e1n kontrol pro \u0161nekov\u00fd p\u0159evod kladkostroje.<\/p>\n

N\u00ed\u017ee uveden\u00e1 tabulka mapuje pracovn\u00ed skupiny FEM s parametry specifikace p\u00e1ru \u0161nekov\u00fdch ozuben\u00fdch kol. Toto je n\u00e1stroj pro v\u00fdb\u011br, kter\u00fd propojuje je\u0159\u00e1bovou aplikaci s po\u0159ad\u00edm p\u00e1ru ozuben\u00fdch kol.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Skupina FEM<\/th>\nTypick\u00fd je\u0159\u00e1b<\/th>\nRo\u010dn\u00ed hodiny<\/th>\nSan Francisco<\/th>\nMateri\u00e1l \u010derv\u016f<\/th>\nMateri\u00e1l kol<\/th>\nInspekce<\/th>\n<\/tr>\n<\/thead>\n
1Bm (sv\u011btlo)<\/td>\nD\u00edlna, \u00fadr\u017eba<\/td>\n\u2264200<\/td>\n1.5<\/td>\nTvrd\u00e1 ocel 16MnCr5<\/td>\nFosforov\u00fd bronz (lit\u00fd gravita\u010dn\u011b)<\/td>\nV\u00fdro\u010dn\u00ed<\/td>\n<\/tr>\n
1:00 (lehk\u00fd re\u017eim)<\/td>\nSklad, mont\u00e1\u017e<\/td>\n200\u2013800<\/td>\n1.75<\/td>\nTvrd\u00e1 ocel 16MnCr5<\/td>\nFosforov\u00fd bronz (lit\u00fd gravita\u010dn\u011b)<\/td>\nV\u00fdro\u010dn\u00ed<\/td>\n<\/tr>\n
2 m (st\u0159edn\u00ed)<\/td>\nObecn\u00e1 tov\u00e1rna, nakl\u00e1dac\u00ed rampa<\/td>\n800\u20132 000<\/td>\n2.0<\/td>\nTvrd\u00e1 ocel 16MnCr5, brou\u0161en\u00e1<\/td>\nFosforov\u00fd bronz (odst\u0159ediv\u00e9 lit\u00ed)<\/td>\n6 m\u011bs\u00edc\u016f<\/td>\n<\/tr>\n
3 m (t\u011b\u017ek\u00fd)<\/td>\nAutomobilov\u00fd lis, sl\u00e9v\u00e1rna<\/td>\n2 000\u20134 000<\/td>\n2.25<\/td>\nTvrd\u00e1 ocel 16MnCr5, brou\u0161en\u00e1 Ra 0.4<\/td>\nOdst\u0159ediv\u011b lit\u00fd CuSn12Ni<\/td>\n6 m\u011bs\u00edc\u016f<\/td>\n<\/tr>\n
4 m (velmi t\u011b\u017ek\u00fd)<\/td>\nOcel\u00e1\u0159sk\u00e1 p\u00e1nev, p\u0159\u00edstavn\u00ed je\u0159\u00e1b<\/td>\n4 000\u20136 000<\/td>\n2.5<\/td>\nTvrd\u00fd 42CrMo4, brou\u0161en\u00fd Ra 0.4<\/td>\nOdst\u0159ediv\u011b lit\u00fd CuSn12Ni<\/td>\n3 m\u011bs\u00edce<\/td>\n<\/tr>\n
5 m (extr\u00e9m)<\/td>\nKontinu\u00e1ln\u00ed lit\u00ed, \u0161roti\u0161t\u011b<\/td>\n6,000+<\/td>\n3.0<\/td>\nTvrd\u00fd 42CrMo4, lapovan\u00fd Ra 0.2<\/td>\nOdst\u0159ediv\u011b lit\u00e9 CuAl10Fe nebo CuSn12Ni<\/td>\nM\u011bs\u00ed\u010dn\u00ed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Postup ze skupiny 1Bm na 5m zdvojn\u00e1sobuje provozn\u00ed faktor (1,5 na 3,0), zvy\u0161uje se odolnost proti gravitaci a lit\u00ed bronzu odst\u0159edivou metodou, \u0161nek se p\u0159esouv\u00e1 z cementa\u010dn\u011b kalen\u00e9 na kalenou ocel a interval inspekce se zkracuje z ro\u010dn\u00edho na m\u011bs\u00ed\u010dn\u00ed. Ka\u017ed\u00fd krok odr\u00e1\u017e\u00ed skute\u010dn\u00fd n\u00e1r\u016fst kumulativn\u00edho \u00fanavov\u00e9ho zat\u00ed\u017een\u00ed: 5m je\u0159\u00e1b pro \u0161roti\u0161t\u011b za\u017eije za jeden m\u011bs\u00edc v\u00edce zat\u011b\u017eovac\u00edch cykl\u016f ne\u017e 1Bm d\u00edlensk\u00fd je\u0159\u00e1b za\u017eije za rok. \u0160nekov\u00fd p\u0159evod pro ka\u017ed\u00fd z nich mus\u00ed b\u00fdt proporcion\u00e1ln\u011b p\u0159esn\u00fd.<\/p>\n

Nej\u010dast\u011bj\u0161\u00ed chybou ve specifikaci p\u0159i zad\u00e1v\u00e1n\u00ed zak\u00e1zek na je\u0159\u00e1b je pou\u017eit\u00ed provozn\u00edho faktoru pro lehk\u00fd provoz u je\u0159\u00e1bu pro st\u0159edn\u00ed nebo t\u011b\u017ek\u00fd provoz. Tov\u00e1rn\u00ed je\u0159\u00e1b, kter\u00fd pracuje na dv\u011b sm\u011bny denn\u011b s \u010dast\u00fdmi zdvihy bl\u00edzk\u00fdmi pracovn\u00edmu v\u00fdkonu, nen\u00ed je\u0159\u00e1bem s provozn\u00ed v\u00fd\u0161kou 1 m \u2013 jeho d\u00e9lka je nejm\u00e9n\u011b 2 m, p\u0159\u00edpadn\u011b 3 m. Podhodnocen\u00ed provozn\u00ed skupiny o jeden nebo dva stupn\u011b znamen\u00e1, \u017ee \u0161nekov\u00fd p\u0159evodov\u00fd p\u00e1r je dimenzov\u00e1n o 25 a\u017e 50 procent pod skute\u010dn\u00fd po\u017eadavek na \u00fanavu materi\u00e1lu. Dvojice snadno proch\u00e1z\u00ed testy uveden\u00ed do provozu (nov\u00e9 p\u00e1ry maj\u00ed v\u017edy rezervu), ale po 18 a\u017e 36 m\u011bs\u00edc\u00edch doch\u00e1z\u00ed k urychlen\u00e9mu opot\u0159eben\u00ed, proto\u017ee kumulativn\u00ed po\u0161kozen\u00ed \u00fanavou materi\u00e1lu doh\u00e1n\u00ed poddimenzovanou specifikaci.<\/p>\n

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\u0160ok z nouzov\u00e9ho brzd\u011bn\u00ed \u2013 p\u0159echodn\u00fd jev, kter\u00fd \u010dasto ur\u010duje velikost<\/h2>\n

\"\u0161nekov\u00fd<\/p>\n

Ust\u00e1len\u00fd zvedac\u00ed moment nen\u00ed pro \u0161nekov\u00fd p\u0159evod je\u0159\u00e1bu nejhor\u0161\u00edm p\u0159\u00edpadem. Nejhor\u0161\u00edm p\u0159\u00edpadem je nouzov\u00e9 zastaven\u00ed: je\u0159\u00e1b spou\u0161t\u00ed b\u0159emeno plnou rychlost\u00ed, obsluha stiskne tla\u010d\u00edtko nouzov\u00e9ho zastaven\u00ed, aktivuje se motorov\u00e1 brzda a rotuj\u00edc\u00ed hmota bubnu kladkostroje, spojky a \u0161nekov\u00e9ho h\u0159\u00eddele zpomal\u00ed z pln\u00e9 rychlosti na nulu za 0,5 a\u017e 1,5 sekundy.<\/p>\n

\u0160pi\u010dka to\u010div\u00e9ho momentu b\u011bhem tohoto zpomalen\u00ed se vypo\u010d\u00edt\u00e1 z rota\u010dn\u00ed setrva\u010dnosti a m\u00edry zpomalen\u00ed: T_r\u00e1z = J_celkov\u00fd \u00d7 (\u03c9 \/ t_zastaven\u00ed) + T_gravitace, kde J_celkov\u00fd je moment setrva\u010dnosti v\u0161ech rotuj\u00edc\u00edch \u010d\u00e1st\u00ed, \u03c9 je \u00fahlov\u00e1 rychlost v okam\u017eiku brzd\u011bn\u00ed, t_zastaven\u00ed je doba brzd\u011bn\u00ed a T_gravitace je konstantn\u00ed gravita\u010dn\u00ed moment od zav\u011b\u0161en\u00e9ho b\u0159emene. U typick\u00fdch pohon\u016f mostov\u00fdch je\u0159\u00e1b\u016f je faktor r\u00e1zu p\u0159i nouzov\u00e9m zastaven\u00ed 2,5 a\u017e 3,0n\u00e1sobek ust\u00e1len\u00e9ho zvedac\u00edho momentu.<\/p>\n

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Nouzov\u00fd moment pro zastaven\u00ed je\u0159\u00e1bov\u00e9ho kladkostroje<\/div>\n
T_zdvih = (SWL \u00d7 g \u00d7 D_bubnu) \/ (2 \u00d7 i \u00d7 \u03b7)<\/div>\n
T_r\u00e1z = T_zdvih \u00d7 K_e \u00a0\u00a0 (K_e = 2,5 a\u017e 3,0)<\/span><\/div>\n
Po\u017eadovan\u00e1_t = T_\u0161ok \u00d7 SF_\u017eensk\u00e1_tlak \u00a0\u00a0 (SF z tabulky FEM v\u00fd\u0161e)<\/span><\/div>\n
Jmenovit\u00fd to\u010div\u00fd moment \u0161nekov\u00e9ho p\u0159evodu mus\u00ed p\u0159ekro\u010dit T_required<\/div>\n
SWL = bezpe\u010dn\u00e9 pracovn\u00ed zat\u00ed\u017een\u00ed (kg), g = 9,81, D_drum = pr\u016fm\u011br bubnu (m)<\/div>\n
i = p\u0159evodov\u00fd pom\u011br, \u03b7 = \u00fa\u010dinnost \u0161nekov\u00e9ho p\u00e1ru, K_e = sou\u010dinitel nouzov\u00e9ho zastaven\u00ed<\/div>\n<\/div>\n

Zpracovan\u00fd p\u0159\u00edklad.<\/strong> Desetitunov\u00fd mostov\u00fd je\u0159\u00e1b, pr\u016fm\u011br bubnu 400 mm, p\u0159evodov\u00fd pom\u011br \u0161nekov\u00e9ho p\u0159evodu 50:1, \u00fa\u010dinnost 45 procent. T_lift = (10 000 \u00d7 9,81 \u00d7 0,4) \/ (2 \u00d7 50 \u00d7 0,45) = 871 N\u00b7m. Sou\u010dinitel nouzov\u00e9ho zastaven\u00ed K_e = 2,5. T_shock = 871 \u00d7 2,5 = 2 178 N\u00b7m. Skupina FEM 3m, SF = 2,25. T_required = 2 178 \u00d7 2,25 = 4 900 N\u00b7m. \u0160nekov\u00fd p\u0159evod mus\u00ed m\u00edt jmenovit\u00fd moment vy\u0161\u0161\u00ed ne\u017e 4 900 N\u00b7m \u2013 zhruba 5,6n\u00e1sobek ust\u00e1len\u00e9ho zdvihac\u00edho momentu 871 N\u00b7m. Pokud by se specifikoval pouze ust\u00e1len\u00fd to\u010div\u00fd moment (v\u00fdb\u011br dvojice s jmenovit\u00fdm momentem nap\u0159\u00edklad 1 200 N\u00b7m), dvojice by b\u011bhem ka\u017ed\u00e9ho nouzov\u00e9ho zastaven\u00ed dos\u00e1hla 408 procent sv\u00e9 jmenovit\u00e9 kapacity. Dvojice by sice prvn\u00edch n\u011bkolik ud\u00e1lost\u00ed p\u0159e\u017eila, ale b\u011bhem 2 a\u017e 4 let p\u0159i n\u00e1ro\u010dn\u00e9m provozu by se u n\u00ed vyvinuly praskliny v ko\u0159eni zubu.<\/p>\n

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Pozn\u00e1mka k in\u017een\u00fdrsk\u00e9mu stolu<\/div>\n

Korejsk\u00e1 lod\u011bnice vym\u011bnila 20 let star\u00fd p\u00e1r \u0161nekov\u00fdch p\u0159evod\u016f pro kladkostroje na 15tunov\u00e9m port\u00e1lov\u00e9m je\u0159\u00e1bu pou\u017e\u00edvan\u00e9m pro mont\u00e1\u017e sekc\u00ed trupu. P\u016fvodn\u00ed p\u00e1r byl nestandardn\u00ed japonsk\u00e9 konstrukce \u2013 modul 6,5, osov\u00e1 vzd\u00e1lenost 182 mm, profil ZN, jednochod\u00fd. \u017d\u00e1dn\u00fd dodavatel z katalogu tyto rozm\u011bry nem\u011bl na sklad\u011b. Lod\u011bnice se zpo\u010d\u00e1tku pokusila sehnat \u201edostate\u010dn\u011b podobnou\u201c n\u00e1hradu: modul 6, osov\u00e1 vzd\u00e1lenost 180 mm, profil ZI. Rozm\u011brov\u00e1 kontrola uk\u00e1zala, \u017ee n\u00e1hrada by do sebe zapadla, ale test kontaktn\u00edho vzoru na zku\u0161ebn\u00ed sestav\u011b uk\u00e1zal pouze 28% pokryt\u00ed soust\u0159ed\u011bn\u00e9 na \u0161pi\u010dk\u00e1ch zub\u016f \u2013 nesoulad profil\u016f ZN a ZI posunul kontaktn\u00ed linii od st\u0159edu boku. Lod\u011bnice si pot\u00e9 objednala zak\u00e1zkov\u011b slad\u011bn\u00fd p\u00e1r s p\u016fvodn\u00edmi nestandardn\u00edmi rozm\u011bry: modul 6,5, osov\u00e1 vzd\u00e1lenost 182 mm, profil ZN, brou\u0161en\u00fd. Cena: 4 200 USD za zak\u00e1zkov\u00fd p\u00e1r oproti 1 100 USD za \u201edostate\u010dn\u011b podobnou\u201c katalogovou n\u00e1hradu. Dodac\u00ed lh\u016fta: 6 t\u00fddn\u016f. Zak\u00e1zkov\u00fd p\u00e1r byl instalov\u00e1n se 72% pokryt\u00edm kontaktn\u00edho vzoru. Toto ponau\u010den\u00ed plat\u00ed pro ka\u017edou v\u00fdm\u011bnu star\u0161\u00edho \u0161nekov\u00e9ho p\u0159evodu je\u0159\u00e1bu: nomin\u00e1ln\u00ed rozm\u011brov\u00e1 podobnost nezaru\u010duje funk\u010dn\u00ed zam\u011bnitelnost. Profilov\u00e1 \u0159ada (ZA, ZN, ZI, ZK) se mus\u00ed p\u0159esn\u011b shodovat a kontaktn\u00ed vzor mus\u00ed b\u00fdt ov\u011b\u0159en p\u0159ed n\u00e1vratem je\u0159\u00e1bu do provozu se zav\u011b\u0161en\u00fdm b\u0159emenem nad pracovn\u00edky.<\/p>\n<\/div>\n

<\/p>\n

Materi\u00e1l a tepeln\u00e9 zpracov\u00e1n\u00ed pro p\u00e1ry \u0161nekov\u00fdch p\u0159evod\u016f je\u0159\u00e1bov\u00fdch kladkostroj\u016f<\/h2>\n

\"materi\u00e1ly<\/p>\n

Pr\u00e1ce s je\u0159\u00e1bem se li\u0161\u00ed od pr\u00e1ce s dopravn\u00edkem nebo balen\u00edm v jednom z\u00e1sadn\u00edm ohledu: r\u00e1zov\u00fd n\u00e1raz p\u0159i nouzov\u00e9m zastaven\u00ed zat\u011b\u017euje patu zubu v ohybu impulsn\u00ed velikost\u00ed, kter\u00e1 akumuluje \u00fanavov\u00e9 po\u0161kozen\u00ed 5 a\u017e 10kr\u00e1t rychleji ne\u017e ust\u00e1len\u00e9 nep\u0159etr\u017eit\u00e9 zat\u00ed\u017een\u00ed stejn\u00fdm pr\u016fm\u011brn\u00fdm kroutic\u00edm momentem. V\u00fdb\u011br materi\u00e1lu mus\u00ed up\u0159ednost\u0148ovat odolnost proti n\u00e1razu a \u00fanavovou odolnost p\u0159ed statickou \u00fanosnost\u00ed.<\/p>\n

\n
\n
FEM 1Bm \u2013 2m (lehk\u00e1 a\u017e st\u0159edn\u00ed)<\/div>\n

\u010cerv:<\/strong> Cementa\u010dn\u011b kalen\u00e1 ocel 16MnCr5 (povrch HRC 58-62, j\u00e1dro HRC 30-35). Tvrd\u00fd pl\u00e1\u0161\u0165 odol\u00e1v\u00e1 d\u016flkov\u00e9mu lomu; m\u011bk\u010d\u00ed j\u00e1dro absorbuje n\u00e1razy bez k\u0159ehk\u00e9ho lomu.
\nKolo:<\/strong> Fosforov\u00fd bronz lit\u00fd gravita\u010dn\u011b CuSn12Ni. Vhodn\u00fd pro n\u00edzk\u00fd a\u017e st\u0159edn\u00ed po\u010det cykl\u016f.
\nDokon\u010dit:<\/strong> \u0160nekov\u00fd brou\u0161en\u00fd Ra 0,8 \u00b5m; odvalovac\u00ed fr\u00e9zovan\u00fd kotou\u010d Ra 1,6 \u00b5m.<\/p>\n<\/div>\n

\n
FEM 3m \u2013 4m (t\u011b\u017ek\u00e9 a\u017e velmi t\u011b\u017ek\u00e9)<\/div>\n

\u010cerv:<\/strong> Cementa\u010dn\u00ed kalen\u00e1 ocel 16MnCr5 (3m) nebo pr\u016fb\u011b\u017en\u011b kalen\u00e1 42CrMo4 HRC 28-34 (4m). Pr\u016fb\u011b\u017en\u00e9 kalen\u00ed zaji\u0161\u0165uje rovnom\u011brnou tvrdost \u2013 \u017e\u00e1dn\u00e9 rozhran\u00ed mezi j\u00e1drem a pl\u00e1\u0161t\u011bm, kter\u00e9 by se mohlo p\u0159i opakovan\u00e9m n\u00e1razu odlupovat.
\nKolo:<\/strong> Odst\u0159ediv\u00e9 lit\u00ed CuSn12Ni. Odst\u0159ediv\u00e9 lit\u00ed vytv\u00e1\u0159\u00ed hust\u0161\u00ed materi\u00e1l bez p\u00f3r\u016f s o 15 a\u017e 25 procent vy\u0161\u0161\u00ed \u00fanavovou pevnost\u00ed ne\u017e gravita\u010dn\u00ed lit\u00ed.
\nDokon\u010dit:<\/strong> \u0160nekov\u00fd brou\u0161en\u00ed Ra 0,4 \u00b5m; kolo odvalov\u00e1no a pot\u00e9 zab\u011bhnuto.<\/p>\n<\/div>\n

\n
N\u00e1mo\u0159n\u00ed a p\u0159\u00edstavn\u00ed je\u0159\u00e1by (libovoln\u00e1 skupina FEM)<\/div>\n

\u010cerv:<\/strong> Pozinkovan\u00e1 kalen\u00e1 ocel (vnitrozemsk\u00fd p\u0159\u00edstav) nebo nerezov\u00e1 ocel AISI 316L (pob\u0159e\u017en\u00ed\/offshore).
\nKolo:<\/strong> Hlin\u00edkov\u00fd bronz CuAl10Fe5Ni5 \u2013 nedoch\u00e1z\u00ed k odzinkov\u00e1n\u00ed v soln\u00e9 mlze, m\u00e1 lep\u0161\u00ed odolnost proti korozi ne\u017e fosforov\u00fd bronz. M\u00edrn\u011b ni\u017e\u0161\u00ed m\u00edra opot\u0159eben\u00ed ne\u017e CuSn12Ni za cenu m\u00edrn\u011b vy\u0161\u0161\u00edho koeficientu t\u0159en\u00ed.
\nDokon\u010dit:<\/strong> \u0160nekov\u00fd brou\u0161en\u00fd Ra 0,4 \u00b5m; v\u0161echny spojovac\u00ed prvky z nerezov\u00e9 oceli A4.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Specifikace t\u0159\u00ed p\u00e1r\u016f \u0161nekov\u00fdch p\u0159evod\u016f je\u0159\u00e1bov\u00fdch kladkostroj\u016f<\/h2>\n
\n
\"Pou\u017eit\u00ed<\/div>\n
\n

T\u0159i n\u00ed\u017ee uveden\u00e9 p\u0159\u00edpady pokr\u00fdvaj\u00ed rozsah zat\u00ed\u017een\u00ed dle FEM od st\u0159edn\u00edho tov\u00e1rn\u00edho je\u0159\u00e1bu a\u017e po extr\u00e9mn\u00ed p\u0159\u00edstavn\u00ed port\u00e1l. Ka\u017ed\u00fd p\u0159\u00edpad ukazuje, jak klasifikace skupin zat\u00ed\u017een\u00ed dle FEM ovliv\u0148uje ka\u017ed\u00fd parametr specifikace \u2013 od provozn\u00edho faktoru a materi\u00e1lu a\u017e po intervaly kontrol a pl\u00e1nov\u00e1n\u00ed v\u00fdm\u011bn.<\/p>\n

Specifikace jsou re\u00e1ln\u00e9, \u010d\u00edsla reprezentuj\u00ed skute\u010dn\u00e9 zad\u00e1v\u00e1n\u00ed ve\u0159ejn\u00fdch zak\u00e1zek a pou\u010den\u00ed plat\u00ed nap\u0159\u00ed\u010d korejsk\u00fdm, japonsk\u00fdm a jihov\u00fdchodn\u00edm asijsk\u00fdm trhem s v\u00fdrobou a \u00fadr\u017ebou je\u0159\u00e1b\u016f.<\/p>\n<\/div>\n<\/div>\n

P\u0159\u00edpad 1 \u2013 Korejsk\u00fd automobilov\u00fd z\u00e1vod: 8tunov\u00fd mostov\u00fd je\u0159\u00e1b, FEM 3m<\/h3>\n

Korejsk\u00e1 automobilov\u00e1 lisovna specifikovala \u0161nekov\u00e9 p\u0159evody pro \u010dty\u0159i 8tunov\u00e9 dvounosn\u00edkov\u00e9 mostov\u00e9 je\u0159\u00e1by pou\u017e\u00edvan\u00e9 pro v\u00fdm\u011bnu n\u00e1stroj\u016f. Pracovn\u00ed cyklus: 15 a\u017e 20 zdvih\u016f za sm\u011bnu, dv\u011b sm\u011bny denn\u011b, 300 pracovn\u00edch dn\u016f v roce. V\u011bt\u0161ina zdvih\u016f p\u0159i 60 a\u017e 80 procentech SWL (lisovac\u00ed n\u00e1stroje v\u00e1\u017e\u00ed 5 a\u017e 6,5 tuny). Klasifikace FEM: 3 m (t\u011b\u017ek\u00e9) na z\u00e1klad\u011b ro\u010dn\u00edho po\u010dtu provozn\u00edch hodin p\u0159ibli\u017en\u011b 2 500 a spektra zat\u00ed\u017een\u00ed koncentrovan\u00e9ho nad 60 procenty SWL. Pr\u016fm\u011br bubnu kladkostroje 350 mm, p\u0159evodov\u00fd pom\u011br 50:1, \u00fa\u010dinnost \u0161nekov\u00e9ho p\u0159evodu 44 procent. T_lift = (8 000 \u00d7 9,81 \u00d7 0,35) \/ (2 \u00d7 50 \u00d7 0,44) = 624 N\u00b7m. Sou\u010dinitel nouzov\u00e9ho zastaven\u00ed K_e = 2,5. T_shock = 1 560 N\u00b7m. SF (FEM 3m) = 2,25. T_required = 3 510 N\u00b7m. Specifikace: jednochod\u00fd, modul 6, rozte\u010d 160 mm, jmenovit\u00fd 3 800 N\u00b7m. Materi\u00e1l: cementa\u010dn\u011b kalen\u00fd \u0161nek 16MnCr5 s brou\u0161en\u00edm Ra 0,4 \u00b5m, odst\u0159ediv\u011b lit\u00e9 kolo CuSn12Ni. Samostatn\u00e1 pru\u017einov\u00e1 elektromagnetick\u00e1 brzda na vysokorychlostn\u00edm vstupn\u00edm h\u0159\u00eddeli. Kontrola: m\u011b\u0159en\u00ed v\u016fle a kontrola kontaktn\u00edho vzoru ka\u017ed\u00fdch 6 m\u011bs\u00edc\u016f. Dosa\u017een\u00e1 \u017eivotnost: pr\u016fm\u011brn\u00e1 \u017eivotnost kola 6,5 \u200b\u200broku p\u0159i 2sm\u011bnn\u00e9m provozu, co\u017e p\u0159ekra\u010duje 5let\u00fd rozpo\u010det. \u0160nek vydr\u017e\u00ed dv\u011b v\u00fdm\u011bny kol.<\/p>\n

P\u0159\u00edpad 2 \u2013 Japonsk\u00fd p\u0159\u00edstavn\u00ed kontejnerov\u00fd manipul\u00e1tor: 40tunov\u00fd port\u00e1l, FEM 4m, koroze v mo\u0159i<\/h3>\n

Japonsk\u00fd p\u0159\u00edstavn\u00ed \u00fa\u0159ad specifikoval dvojice \u0161nekov\u00fdch p\u0159evod\u016f pro dva 40tunov\u00e9 port\u00e1lov\u00e9 je\u0159\u00e1by pro p\u0159epravu kontejner\u016f typu lodn\u00ed doprava-b\u0159eh, kter\u00e9 pracuj\u00ed v pob\u0159e\u017en\u00edm prost\u0159ed\u00ed s p\u0159\u00edm\u00fdm vystaven\u00edm soln\u00e9 mlze. Klasifikace FEM: 4 m (velmi t\u011b\u017ek\u00fd) \u2013 provoz 18 hodin denn\u011b, 350 dn\u00ed v roce, t\u00e9m\u011b\u0159 v\u0161echny zdvihy p\u0159i 80 a\u017e 100 procentech SWL (nalo\u017een\u00e9 20stop\u00e9 kontejnery v\u00e1\u017e\u00ed 24 a\u017e 30 tun). Pr\u016fm\u011br bubnu kladkostroje 600 mm, p\u0159evodov\u00fd pom\u011br 60:1, \u00fa\u010dinnost dvojice \u0161nekov\u00fdch p\u0159evod\u016f 42 procent. T_lift = (40 000 \u00d7 9,81 \u00d7 0,6) \/ (2 \u00d7 60 \u00d7 0,42) = 4 672 N\u00b7m. K_e = 3,0 (siln\u00e9 dynamick\u00e9 brzd\u011bn\u00ed p\u0159i stohov\u00e1n\u00ed kontejner\u016f). T_shock = 14 016 N\u00b7m. SF (FEM 4m) = 2,5. T_required = 35 040 N\u00b7m. Toto daleko p\u0159ekra\u010duje mo\u017enosti jednoho p\u00e1ru ozuben\u00fdch kol \u2013 \u0159e\u0161\u00ed se to uspo\u0159\u00e1d\u00e1n\u00edm s dvojit\u00fdm \u0161nekov\u00fdm p\u0159evodem (dva p\u00e1ry sd\u00edlej\u00edc\u00ed zat\u00ed\u017een\u00ed prost\u0159ednictv\u00edm spole\u010dn\u00e9ho v\u00fdstupn\u00edho ozuben\u00e9ho soukol\u00ed, p\u0159i\u010dem\u017e ka\u017ed\u00fd p\u00e1r nese polovi\u010dn\u00ed to\u010div\u00fd moment 17 520 N\u00b7m). Ka\u017ed\u00fd p\u00e1r: modul 10, rozte\u010d st\u0159ed\u016f 250 mm, jmenovit\u00fd moment 18 000 N\u00b7m. Materi\u00e1l: pozinkovan\u00fd kalen\u00fd \u0161nek (ochrana proti soln\u00e9 mlze dle ISO 12944 C4), kolo z hlin\u00edkov\u00e9ho bronzu CuAl10Fe5Ni5 (nulov\u00e9 riziko odzinkov\u00e1n\u00ed). V\u0161echny spojovac\u00ed prvky jsou z nerezov\u00e9 oceli A4. Kontrola: \u010dtvrtletn\u00ed m\u011b\u0159en\u00ed v\u016fle, m\u011bs\u00ed\u010dn\u00ed vizu\u00e1ln\u00ed kontrola t\u011bsn\u011bn\u00ed, ro\u010dn\u00ed ov\u011b\u0159en\u00ed kontaktn\u00edho vzoru. Proch\u00e1zet \u0161nekov\u00fd reduktor s vysokou z\u00e1t\u011b\u017e\u00ed<\/a> mo\u017enosti, kter\u00e9 zahrnuj\u00ed ochranu proti korozi n\u00e1mo\u0159n\u00ed \u00farovn\u011b pro aplikace v p\u0159\u00edstavech a pob\u0159e\u017en\u00edch je\u0159\u00e1bech.<\/p>\n

P\u0159\u00edpad 3 \u2013 Vietnamsk\u00e9 staveni\u0161t\u011b: 6tunov\u00fd v\u011b\u017eov\u00fd je\u0159\u00e1b, FEM 2m, n\u00e1kladov\u011b optimalizovan\u00fd<\/h3>\n

Vietnamsk\u00fd v\u00fdrobce stavebn\u00edch stroj\u016f specifikoval p\u00e1ry \u0161nekov\u00fdch p\u0159evod\u016f pro flotilu 30 v\u011b\u017eov\u00fdch je\u0159\u00e1b\u016f s nosnost\u00ed 6 tun pro v\u00fdstavbu bytov\u00fdch dom\u016f. Klasifikace FEM: 2 m (st\u0159edn\u00ed) \u2013 8 a\u017e 10 zdvih\u016f za hodinu b\u011bhem aktivn\u00ed v\u00fdstavby, ale pouze 200 a\u017e 250 pracovn\u00edch dn\u016f v roce a v\u011bt\u0161ina zdvih\u016f v\u00fdrazn\u011b pod SWL (betonov\u00e9 l\u017e\u00edce o nosnosti 2 a\u017e 3 tuny, svazky beton\u00e1\u0159sk\u00e9 oceli o nosnosti 1 a\u017e 2 tuny, zdvihy s plnou SWL vz\u00e1cn\u00e9). T_zdvih p\u0159i SWL: (6 000 \u00d7 9,81 \u00d7 0,30) \/ (2 \u00d7 40 \u00d7 0,46) = 480 N\u00b7m. K_e = 2,5. T_r\u00e1zov\u00e1 s\u00edla = 1 200 N\u00b7m. SF (FEM 2m) = 2,0. T_po\u017eadovan\u00e1 s\u00edla = 2 400 N\u00b7m. Specifikace: jednor\u00e1zov\u00fd, modul 5, rozte\u010d 125 mm, jmenovit\u00fd 2 600 N\u00b7m. Materi\u00e1l: standardn\u00ed cementa\u010dn\u011b kalen\u00fd \u0161nek 16MnCr5, gravita\u010dn\u011b lit\u00e9 kolo CuSn12Ni (optimalizovan\u00e9 z hlediska n\u00e1klad\u016f \u2013 odst\u0159ediv\u00e9 lit\u00ed nen\u00ed nutn\u00e9 p\u0159i provozu 2 m). Cena za p\u00e1r: 380 USD. Pro flotilu 30 je\u0159\u00e1b\u016f \u010dinila \u00faspora oproti specifikaci odst\u0159ediv\u00e9ho lit\u00ed (odhadovan\u00fdch 580 USD za p\u00e1r) 6 000 USD \u2013 co\u017e je pro stavebn\u00ed trh citliv\u00fd na cenu smyslupln\u00e9. Inspekce: ro\u010dn\u00ed, v souladu s ro\u010dn\u00ed certifikac\u00ed je\u0159\u00e1bu. C\u00edlov\u00e1 \u017eivotnost: 4 roky na kolo (odpov\u00edd\u00e1 typick\u00e9mu 4let\u00e9mu cyklu pron\u00e1jmu je\u0159\u00e1bu). Dosa\u017eeno: Pr\u016fm\u011brn\u011b 4,2 roku nap\u0159\u00ed\u010d flotilou, c\u00edl spln\u011bn s m\u00edrnou rezervou.<\/p>\n

<\/p>\n

\u010casto kladen\u00e9 ot\u00e1zky<\/h2>\n
\n
\nOt\u00e1zka: M\u016f\u017ee \u0161nekov\u00fd p\u0159evod je\u0159\u00e1bov\u00e9ho kladkostroje n\u011bkdy pou\u017e\u00edt dvouchod\u00fd \u0161nek?<\/summary>\n

U mechanismu kladkostroje t\u00e9m\u011b\u0159 nikdy. Dvouchod\u00fd \u0161nek p\u0159i typick\u00fdch hodnot\u00e1ch q vytv\u00e1\u0159\u00ed \u00fahel stoup\u00e1n\u00ed 10 a\u017e 12 stup\u0148\u016f \u2013 co\u017e je v\u00fdrazn\u011b nad \u00fahlem t\u0159en\u00ed, a proto se nezablokuje. B\u0159emeno by spadlo, pokud by brzda selhala. N\u011bkte\u0159\u00ed v\u00fdrobci je\u0159\u00e1b\u016f pou\u017e\u00edvaj\u00ed pro pohony pojezdu a p\u0159\u00ed\u010dn\u00e9ho pojezdu je\u0159\u00e1bu (horizont\u00e1ln\u00ed pohyb) dvouchod\u00e9 nebo t\u0159\u00edchod\u00e9 p\u00e1ry \u0161nek\u016f, kde nehroz\u00ed riziko po\u0161kozen\u00ed zav\u011b\u0161en\u00e9ho b\u0159emene a vy\u0161\u0161\u00ed \u00fa\u010dinnost sni\u017euje dimenzov\u00e1n\u00ed motoru. Pohon kladkostroje \u2013 mechanismus, kter\u00fd dr\u017e\u00ed b\u0159emeno proti gravitaci \u2013 je v\u0161ak univerz\u00e1ln\u011b jednochod\u00fd se siln\u00fdm samosvorn\u00fdm mechanismem. Toto pravidlo nem\u00e1 v \u017e\u00e1dn\u00e9 norm\u011b pro je\u0159\u00e1by na sv\u011bt\u011b \u017e\u00e1dn\u00e9 v\u00fdjimky.<\/p>\n<\/details>\n

\nOt\u00e1zka: Jak \u010dasto by se m\u011bl kontrolovat \u0161nekov\u00fd p\u0159evod je\u0159\u00e1bov\u00e9ho kladkostroje?<\/summary>\n

V\u00fd\u0161e uveden\u00e1 tabulka pracovn\u00edch skupin FEM specifikuje interval: ro\u010dn\u00ed pro 1Bm a 1Am, 6m\u011bs\u00ed\u010dn\u00ed pro 2m a 3m, \u010dtvrtletn\u00ed pro 4m a m\u011bs\u00ed\u010dn\u00ed pro 5m. Minim\u00e1ln\u00ed kontrola zahrnuje m\u011b\u0159en\u00ed v\u016fle (porovnejte s dodac\u00edm listem), vizu\u00e1ln\u00ed kontrolu t\u011bsn\u011bn\u00ed na prosakov\u00e1n\u00ed maziva a srovn\u00e1n\u00ed z\u00e1kladn\u00ed hlukov\u00e9 hladiny. U je\u0159\u00e1b\u016f s FEM nad 3m je t\u0159eba v ka\u017ed\u00e9m 6m\u011bs\u00ed\u010dn\u00edm intervalu ov\u011b\u0159it kontaktn\u00ed vzor pomoc\u00ed zna\u010dkovac\u00ed pasty. Kontrola kontaktn\u00edho vzoru je jedinou spolehlivou metodou pro detekci d\u016flkov\u00e9 koroze na boc\u00edch zub\u016f d\u0159\u00edve, ne\u017e dos\u00e1hne f\u00e1ze, kdy se n\u00e1r\u016fst v\u016fle st\u00e1v\u00e1 m\u011b\u0159iteln\u00fdm \u2013 obvykle poskytuje varov\u00e1n\u00ed 6 a\u017e 12 m\u011bs\u00edc\u016f p\u0159edem, ne\u017e se v\u00fdm\u011bna stane nal\u00e9havou.<\/p>\n<\/details>\n

\nOt\u00e1zka: Jak\u00fd je vztah mezi SWL a jmenovit\u00fdm to\u010div\u00fdm momentem \u0161nekov\u00e9ho p\u0159evodu?<\/summary>\n

SWL (bezpe\u010dn\u00e9 pracovn\u00ed zat\u00ed\u017een\u00ed) je maxim\u00e1ln\u00ed zat\u00ed\u017een\u00ed, kter\u00e9 je\u0159\u00e1b sm\u00ed zvedat. Jmenovit\u00fd kroutic\u00ed moment p\u00e1ru \u0161nekov\u00fdch p\u0159evod\u016f mus\u00ed p\u0159ekro\u010dit kroutic\u00ed moment vyvolan\u00fd p\u0159i SWL po aplikaci r\u00e1zov\u00e9ho faktoru nouzov\u00e9ho zastaven\u00ed a provozn\u00edho faktoru FEM. Typick\u00fd vztah je T_jmenovit\u00fd (p\u00e1r) = SWL \u00d7 g \u00d7 D_bubnu \/ (2 \u00d7 i \u00d7 \u03b7) \u00d7 K_e \u00d7 SF. U v\u011bt\u0161iny mostov\u00fdch je\u0159\u00e1b\u016f se standardn\u00edmi pr\u016fm\u011bry bubn\u016f a p\u0159evodov\u00fdmi pom\u011bry je po\u017eadovan\u00fd jmenovit\u00fd kroutic\u00ed moment p\u00e1ru zhruba 4 a\u017e 6kr\u00e1t vy\u0161\u0161\u00ed ne\u017e ust\u00e1len\u00fd zvedac\u00ed moment p\u0159i SWL. Tento pom\u011br vysv\u011btluje, pro\u010d se p\u00e1ry \u0161nekov\u00fdch p\u0159evod\u016f je\u0159\u00e1b\u016f jev\u00ed jako \u201enaddimenzovan\u00e9\u201c ve srovn\u00e1n\u00ed s aplikacemi u dopravn\u00edk\u016f nebo m\u00edcha\u010dek p\u0159i stejn\u00e9m ust\u00e1len\u00e9m kroutic\u00edm momentu \u2013 rozd\u00edl je zcela zp\u016fsoben bezpe\u010dnostn\u00edmi faktory nouzov\u00e9ho zastaven\u00ed a FEM, kter\u00e9 je\u0159\u00e1bov\u00e9 aplikace vy\u017eaduj\u00ed.<\/p>\n<\/details>\n

\nOt\u00e1zka: Jak\u00fd typ brzdy je vy\u017eadov\u00e1n vedle samosvorn\u00e9ho \u0161nekov\u00e9ho p\u0159evodu?<\/summary>\n

V\u0161echny pohony je\u0159\u00e1bov\u00fdch zdvihadel vy\u017eaduj\u00ed pru\u017einovou, elektricky uvol\u0148ovanou kotou\u010dovou nebo bubnovou brzdu na h\u0159\u00eddeli motoru (strana vysok\u00fdch ot\u00e1\u010dek). Brzda se zapne automaticky p\u0159i odpojen\u00ed elektrick\u00e9ho nap\u00e1jen\u00ed a poskytuje p\u0159\u00eddr\u017en\u00fd moment nez\u00e1visle na samosvorn\u00e9m \u0161nekov\u00e9m p\u0159evodu. Brzda je navr\u017eena tak, aby dr\u017eela pln\u00fd pracovn\u00ed tlak (SWL) plus bezpe\u010dnostn\u00ed rezervu (obvykle 1,5 a\u017e 2,0n\u00e1sobek statick\u00e9ho gravita\u010dn\u00edho momentu na h\u0159\u00eddeli motoru). Samosvorn\u00fd \u0161nekov\u00fd p\u0159evod a mechanick\u00e1 brzda tvo\u0159\u00ed dvouvrstv\u00fd p\u0159\u00eddr\u017en\u00fd syst\u00e9m: pokud jeden sel\u017ee, druh\u00fd st\u00e1le zabra\u0148uje p\u00e1du b\u0159emene. N\u011bkter\u00e9 je\u0159\u00e1by s vysokou kritickou hodnotou (FEM 4m a vy\u0161\u0161\u00ed) p\u0159id\u00e1vaj\u00ed t\u0159et\u00ed vrstvu \u2013 rohatkovou z\u00e1padku nebo volnob\u011b\u017enou spojku na h\u0159\u00eddeli bubnu \u2013 \u010d\u00edm\u017e vytv\u00e1\u0159ej\u00ed trojitou redundanci. Tento t\u0159\u00edvrstv\u00fd p\u0159\u00edstup je typick\u00fd u p\u00e1nvov\u00fdch je\u0159\u00e1b\u016f pro roztaven\u00fd kov, kde m\u00e1 spadl\u00fd n\u00e1klad katastrof\u00e1ln\u00ed n\u00e1sledky.<\/p>\n<\/details>\n

\nOt\u00e1zka: Jak ur\u010d\u00edm spr\u00e1vnou skupinu pr\u00e1ce podle metody kone\u010dn\u00fdch prvk\u016f (FEM) pro konkr\u00e9tn\u00ed je\u0159\u00e1b?<\/summary>\n

Jsou pot\u0159eba dva vstupy: celkov\u00fd po\u010det zdvihac\u00edch cykl\u016f b\u011bhem projektovan\u00e9 \u017eivotnosti je\u0159\u00e1bu (obvykle 10 a\u017e 25 let) a t\u0159\u00edda spektra zat\u00ed\u017een\u00ed (jak\u00fd pod\u00edl zdvih\u016f se bl\u00ed\u017e\u00ed SWL oproti lehk\u00fdm b\u0159emen\u016fm). Klasifika\u010dn\u00ed tabulky poskytuj\u00ed normy ISO 4301 a FEM bro\u017eura 2. Jako praktick\u00e1 zkratka: d\u00edlensk\u00e9 je\u0159\u00e1by s m\u00e9n\u011b ne\u017e 50 zdvihy t\u00fddn\u011b maj\u00ed v\u00fd\u0161ku 1Bm; tov\u00e1rn\u00ed je\u0159\u00e1by s 50 a\u017e 200 zdvihy t\u00fddn\u011b maj\u00ed v\u00fd\u0161ku 1Am a\u017e 2m; v\u00fdrobn\u00ed je\u0159\u00e1by s 200 a\u017e 1 000 zdvihy t\u00fddn\u011b maj\u00ed v\u00fd\u0161ku 3m; procesn\u00ed je\u0159\u00e1by s nep\u0159etr\u017eit\u00fdm v\u00edcesm\u011bnn\u00fdm provozem maj\u00ed v\u00fd\u0161ku 4m a\u017e 5m. Pokud je\u0159\u00e1b obsluhuje v\u00fdrobn\u00ed linku a jezd\u00ed ka\u017ed\u00fd pracovn\u00ed den, je to alespo\u0148 2m bez ohledu na to, jak lehk\u00e9 jsou jednotliv\u00e9 zdvihy. Ofici\u00e1ln\u00ed klasifikaci FEM naleznete v dokumentaci v\u00fdrobce je\u0159\u00e1bu \u2013 m\u011bla by b\u00fdt uvedena na \u0161t\u00edtku s \u00fadaji o je\u0159\u00e1bu.<\/p>\n<\/details>\n

\nOt\u00e1zka: Mohu pro zv\u00fd\u0161en\u00ed \u00fa\u010dinnosti nahradit \u0161nekov\u00fd p\u0159evod je\u0159\u00e1bov\u00e9ho kladkostroje \u0161roubov\u00fdm p\u0159evodem?<\/summary>\n

Technicky mo\u017en\u00e9, ale z\u00e1sadn\u011b to m\u011bn\u00ed bezpe\u010dnostn\u00ed architekturu. \u0160roubovit\u00fd p\u00e1r se samosvorn\u011b neuzamyk\u00e1 \u2013 brzda se st\u00e1v\u00e1 jedin\u00fdm p\u0159\u00eddr\u017en\u00fdm za\u0159\u00edzen\u00edm. V\u011bt\u0161ina norem pro je\u0159\u00e1by to akceptuje (mnoho modern\u00edch vysokorychlostn\u00edch je\u0159\u00e1b\u016f pou\u017e\u00edv\u00e1 \u0161roubovicov\u00e9 p\u00e1ry s vysoce v\u00fdkonn\u00fdmi brzdami), ale m\u011bn\u00ed se re\u017eim \u00fadr\u017eby: brzda mus\u00ed b\u00fdt kontrolov\u00e1na mnohem \u010dast\u011bji. U st\u00e1vaj\u00edc\u00edch je\u0159\u00e1b\u016f navr\u017een\u00fdch pro samosvorn\u00e9 \u0161nekov\u00e9 p\u0159evody se p\u0159echod na \u0161roubovicov\u00fd p\u0159evod bez bezpe\u010dnostn\u00ed kontroly a modernizace brzd nedoporu\u010duje.<\/p>\n<\/details>\n<\/div>\n

<\/p>\n

\u0160nekov\u00e9 p\u0159evody je\u0159\u00e1b\u016f a kladkostroj\u016f pracuj\u00ed v nejp\u0159\u00edsn\u011bj\u0161\u00edm bezpe\u010dnostn\u00edm r\u00e1mci ze v\u0161ech pr\u016fmyslov\u00fdch p\u0159evodov\u00fdch aplikac\u00ed. Klasifikace skupin pou\u017eit\u00ed dle metody kone\u010dn\u00fdch prvk\u016f (FEM) propojuje skute\u010dnou \u017eivotnost je\u0159\u00e1bu \u2013 jeho provozn\u00ed hodiny, spektrum zat\u00ed\u017een\u00ed a po\u010det cykl\u016f \u2013 s provozn\u00edm faktorem, druhem materi\u00e1lu a intervalem kontrol \u0161nekov\u00e9ho p\u0159evodu. Faktor r\u00e1z\u016f p\u0159i nouzov\u00e9m zastaven\u00ed (2,5 a\u017e 3,0n\u00e1sobek ust\u00e1len\u00e9ho to\u010div\u00e9ho momentu) je \u010dasto z\u00e1vazn\u00fdm omezen\u00edm, kter\u00e9 ur\u010duje minim\u00e1ln\u00ed velikost r\u00e1mu \u2013 a specifikace pouze na z\u00e1klad\u011b ust\u00e1len\u00e9ho zvedac\u00edho momentu podhodnocuje dan\u00fd p\u00e1r faktorem 4 a\u017e 6. V\u00fdb\u011br materi\u00e1lu se \u0159\u00edd\u00ed skupinou pou\u017eit\u00ed: gravita\u010dn\u011b lit\u00fd bronz pro lehk\u00e9 zat\u00ed\u017een\u00ed, odst\u0159ediv\u011b lit\u00fd pro t\u011b\u017ek\u00e9 zat\u00ed\u017een\u00ed, hlin\u00edkov\u00fd bronz pro mo\u0159sk\u00e9 prost\u0159ed\u00ed. \u010cetnost kontrol se s rostouc\u00ed skupinou pou\u017eit\u00ed zkracuje z ro\u010dn\u00ed na m\u011bs\u00ed\u010dn\u00ed. Univerz\u00e1ln\u00ed pravidlo pro v\u0161echny skupiny pou\u017eit\u00ed je, \u017ee \u0161nekov\u00e9 p\u0159evody je\u0159\u00e1b\u016f a kladkostroj\u016f mus\u00ed b\u00fdt jednor\u00e1zov\u00e9, siln\u011b samosvorn\u00e9 a zaji\u0161t\u011bn\u00e9 samostatnou mechanickou brzdou \u2013 nutn\u00e1 je pouze geometrick\u00e1 samosvornost, brzda poskytuje redundanci, kterou vy\u017eaduj\u00ed bezpe\u010dnostn\u00ed p\u0159edpisy.<\/p>\n

Pro v\u00fdrobce je\u0159\u00e1b\u016f a \u00fadr\u017eb\u00e1\u0159sk\u00e9 t\u00fdmy, kter\u00e9 specifikuj\u00ed p\u00e1ry \u0161nekov\u00fdch p\u0159evod\u016f kladkostroj\u016f, na\u0161e technick\u00e9 odd\u011blen\u00ed ov\u011b\u0159\u00ed klasifikaci pracovn\u00edch skupin podle FEM a provede v\u00fdpo\u010det r\u00e1z\u016f p\u0159i nouzov\u00e9m zastaven\u00ed s ohledem na parametry va\u0161eho je\u0159\u00e1bu. Standardn\u00ed katalog fosforov\u011b bronzov\u00e9 \u0161nekov\u00e9 p\u0159evodovky<\/a> Pokr\u00fdv\u00e1 rozte\u010de st\u0159ed\u016f od 80 do 250 mm v konfigurac\u00edch s jedn\u00edm chodem s kompletn\u00ed inspek\u010dn\u00ed dokumentac\u00ed dle DIN 3974. K dispozici jsou zak\u00e1zkov\u00e9 p\u00e1rov\u00e1n\u00ed materi\u00e1l\u016f (hlin\u00edkov\u00fd bronz, nerezov\u00e1 ocel, kalen\u00e9 oceli) a nestandardn\u00ed n\u00e1hradn\u00ed p\u00e1ry star\u0161\u00edch materi\u00e1l\u016f s dodac\u00ed lh\u016ftou 4 a\u017e 6 t\u00fddn\u016f \u2013 ode\u0161lete popt\u00e1vku specifikace pohonu je\u0159\u00e1bov\u00e9ho kladkostroje<\/a> s va\u0161\u00ed pracovn\u00ed hmotnost\u00ed (SWL), pr\u016fm\u011brem bubnu a klasifikac\u00ed skupiny FEM.<\/p>\n

<\/p>\n

\n

Specifikace p\u00e1r\u016f \u0161nekov\u00fdch p\u0159evod\u016f pro je\u0159\u00e1bov\u00e9 nebo kladkostrojov\u00e9 aplikace?<\/h3>\n

Za\u0161lete n\u00e1m pracovn\u00ed hmotnost je\u0159\u00e1bu, pr\u016fm\u011br bubnu kladkostroje, p\u0159evodov\u00fd pom\u011br, pracovn\u00ed skupinu FEM a prost\u0159ed\u00ed (vnit\u0159n\u00ed, venkovn\u00ed, pob\u0159e\u017en\u00ed, n\u00e1mo\u0159n\u00ed). Vypo\u010d\u00edt\u00e1me r\u00e1zov\u00fd moment nouzov\u00e9ho zastaven\u00ed, doporu\u010d\u00edme spr\u00e1vn\u00e9 p\u00e1rov\u00e1n\u00ed materi\u00e1l\u016f FEM a nab\u00eddneme standardn\u00ed i zak\u00e1zkov\u00e9 mo\u017enosti \u2013 obvykle do jednoho pracovn\u00edho dne.<\/p>\n

Vy\u017e\u00e1dejte si specifikaci pohonu je\u0159\u00e1bov\u00e9ho kladkostroje \u2192<\/a><\/p>\n<\/div>\n

upravit u\u017eivatelem cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Korea Ever-Power \u00b7 Application Engineering Guide Worm and Worm Wheel for Overhead Crane and Hoist Drives A crane worm gear pair that fails to hold is a crane that releases its load. Every person standing beneath a suspended beam, coil, or mould trusts their life to the self-locking threshold of a single gear pair. The […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[2821],"tags":[],"class_list":["post-1348","post","type-post","status-publish","format-standard","hentry","category-worm-and-worm-wheel"],"_links":{"self":[{"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/posts\/1348","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/comments?post=1348"}],"version-history":[{"count":1,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/posts\/1348\/revisions"}],"predecessor-version":[{"id":1351,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/posts\/1348\/revisions\/1351"}],"wp:attachment":[{"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/media?parent=1348"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/categories?post=1348"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/worm-and-worm-wheel.com\/cs\/wp-json\/wp\/v2\/tags?post=1348"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}