{"id":3325,"date":"2026-05-14T03:45:00","date_gmt":"2026-05-14T03:45:00","guid":{"rendered":"https:\/\/sprocket-chain.net\/?p=3325"},"modified":"2026-05-14T03:45:00","modified_gmt":"2026-05-14T03:45:00","slug":"leaf-chain-and-hoist-chain","status":"publish","type":"post","link":"https:\/\/sprocket-chain.net\/cs\/leaf-chain-and-hoist-chain\/","title":{"rendered":"Listov\u00e9 \u0159et\u011bzy a kladkostroje: \u0158ada AL\/BL, pohony sto\u017e\u00e1r\u016f vysokozdvi\u017en\u00fdch voz\u00edk\u016f a bezpe\u010dn\u00e9 pracovn\u00ed zat\u00ed\u017een\u00ed"},"content":{"rendered":"
\n

<\/p>\n

\n
<\/div>\n

<\/p>\n

<\/div>\n
\n
\n
Zved\u00e1n\u00ed a zdvih\u00e1n\u00ed<\/div>\n
ASME B29.8 \u00b7 ISO 4347 \u00b7 EN 14659<\/div>\n<\/div>\n

Listov\u00e9 \u0159et\u011bzy a kladkostroje: \u0158ada AL\/BL, pohony sto\u017e\u00e1r\u016f vysokozdvi\u017en\u00fdch voz\u00edk\u016f a bezpe\u010dn\u00e9 pracovn\u00ed zat\u00ed\u017een\u00ed<\/h1>\n

Listov\u00fd \u0159et\u011bz nen\u00ed v\u00e1le\u010dkov\u00fd \u0159et\u011bz bez v\u00e1le\u010dk\u016f. Jedn\u00e1 se o konstruk\u010dn\u011b odli\u0161nou kategorii v\u00fdrobk\u016f s vlastn\u00edmi normami \u00fanavy materi\u00e1lu, po\u017eadavky na kontrolu a povinn\u00fdmi krit\u00e9rii pro vy\u0159azen\u00ed z provozu \u2013 a z\u00e1m\u011bna t\u011bchto krit\u00e9ri\u00ed s prax\u00ed v\u00e1le\u010dkov\u00fdch \u0159et\u011bz\u016f je zodpov\u011bdn\u00e1 za v\u011bt\u0161inu z\u00e1va\u017en\u00fdch poruch listov\u00fdch \u0159et\u011bz\u016f ve vysokozdvi\u017en\u00fdch voz\u00edkech a kladkostroj\u00edch.<\/p>\n

Potvr\u010fte specifikaci a interval v\u00fdm\u011bny va\u0161eho listov\u00e9ho \u0159et\u011bzu<\/a><\/p>\n<\/div>\n<\/div>\n

\n

<\/p>\n

Vy\u0161et\u0159ov\u00e1n\u00ed selh\u00e1n\u00ed \u0159et\u011bzu sto\u017e\u00e1ru vysokozdvi\u017en\u00e9ho voz\u00edku v logistick\u00e9m termin\u00e1lu v In\u010dchonu v roce 2024 zjistilo, \u017ee listov\u00fd \u0159et\u011bz AL1022 na sto\u017e\u00e1ru byl vym\u011bn\u011bn p\u0159i prodlou\u017een\u00ed 3% \u2013 co\u017e je stejn\u00e1 prahov\u00e1 hodnota, kterou \u00fadr\u017eb\u00e1\u0159sk\u00fd t\u00fdm pou\u017eil na hnac\u00ed v\u00e1le\u010dkov\u00e9 \u0159et\u011bzy na stejn\u00fdch vozidlech. To se uk\u00e1zalo jako nespr\u00e1vn\u00e9. Pro listov\u00e9 \u0159et\u011bzy pou\u017e\u00edvan\u00e9 ve zdvihac\u00edch za\u0159\u00edzen\u00edch vy\u017eaduje norma ASME B29.8 prodlou\u017een\u00ed 2% pro standardn\u00ed provoz a prodlou\u017een\u00ed 1,5% pro aplikace, kde je \u0159et\u011bz vystaven korozi nebo r\u00e1zov\u00e9mu zat\u00ed\u017een\u00ed. \u0158et\u011bz, kter\u00fd selhal, byl nam\u011b\u0159en p\u0159i prodlou\u017een\u00ed 2,1% a byl vr\u00e1cen do provozu. Porucha spo\u010d\u00edvala v \u00fanavov\u00e9 trhlin\u011b v \u010dl\u00e1nkov\u00e9 desce \u2013 nikoli v jednor\u00e1zov\u00e9m p\u0159et\u00ed\u017een\u00ed, ale v kumulativn\u00edm d\u016fsledku provozu \u0159et\u011bzu p\u0159i cyklick\u00e9m zat\u00ed\u017een\u00ed nad mez\u00ed \u00fanavy po n\u011bkolik stovek dal\u0161\u00edch cykl\u016f po p\u0159ekro\u010den\u00ed prahov\u00e9 hodnoty pro vy\u0159azen\u00ed.<\/p>\n

Poruchy listov\u00fdch \u0159et\u011bz\u016f ve zdvihac\u00edch za\u0159\u00edzen\u00edch nejsou z\u00e1vadou materi\u00e1lu \u0159et\u011bzu ani specifikace v\u00fdrobce \u0159et\u011bzu. T\u00e9m\u011b\u0159 v\u017edy se jedn\u00e1 o selh\u00e1n\u00ed inspek\u010dn\u00edho a vy\u0159azovac\u00edho programu. Pochopen\u00ed toho, pro\u010d maj\u00ed listov\u00e9 \u0159et\u011bzy odli\u0161n\u00e1 krit\u00e9ria pro vy\u0159azov\u00e1n\u00ed ne\u017e v\u00e1le\u010dkov\u00e9 \u0159et\u011bzy \u2013 a pro\u010d tato krit\u00e9ria existuj\u00ed \u2013 je z\u00e1kladem bezpe\u010dn\u00e9ho programu \u00fadr\u017eby kladkostroj\u016f.<\/p>\n

<\/p>\n

Co je listov\u00fd \u0159et\u011bz \u2013 struktura a pro\u010d nem\u00e1 \u017e\u00e1dn\u00e9 v\u00e1le\u010dky<\/h2>\n
\n
\n

Listov\u00fd \u0159et\u011bz se skl\u00e1d\u00e1 ze st\u0159\u00eddaj\u00edc\u00edch se sad \u010dl\u00e1nkov\u00fdch desek spojen\u00fdch kalen\u00fdmi ocelov\u00fdmi \u010depy. V konven\u010dn\u00edm smyslu v\u00e1le\u010dkov\u00fdch \u0159et\u011bz\u016f nejsou k dispozici \u017e\u00e1dn\u00e1 pouzdra, \u017e\u00e1dn\u00e9 v\u00e1le\u010dky ani \u017e\u00e1dn\u00e9 vn\u011bj\u0161\u00ed \u010dl\u00e1nkov\u00e9 desti\u010dky \u2013 ka\u017ed\u00e1 desti\u010dka v listov\u00e9m \u0159et\u011bzu je vnit\u0159n\u00ed desti\u010dka, kter\u00e1 p\u0159\u00edmo dosed\u00e1 na povrch \u010depu. Pevnost listov\u00e9ho \u0159et\u011bzu vych\u00e1z\u00ed z celkov\u00e9 plochy pr\u016f\u0159ezu \u010dl\u00e1nkov\u00fdch desek v otvoru pro \u010dep vyn\u00e1soben\u00e9 po\u010dtem pramen\u016f desti\u010dek v \u0159ad\u011b \u0159et\u011bzu.<\/p>\n

Absence v\u00e1le\u010dk\u016f je z\u00e1m\u011brn\u00e1. Listov\u00fd \u0159et\u011bz je navr\u017een v\u00fdhradn\u011b pro vratn\u00fd line\u00e1rn\u00ed pohyb po kladce, nikoli pro z\u00e1b\u011br s ozuben\u00fdm kolem p\u0159i rychlosti. U pohonu sto\u017e\u00e1ru vysokozdvi\u017en\u00e9ho voz\u00edku se \u0159et\u011bz ov\u00edj\u00ed kolem pevn\u00e9 nebo pohybliv\u00e9 kladky v horn\u00ed \u010d\u00e1sti vnit\u0159n\u00edho sto\u017e\u00e1ru a spojuje voz\u00edk s konstrukc\u00ed sto\u017e\u00e1ru. Funkc\u00ed \u0159et\u011bzu je p\u0159en\u00e1\u0161et s\u00edlu hydraulick\u00e9ho v\u00e1lce na s\u00edlu zdvihu voz\u00edku \u2013 \u010dist\u011b tahovou aplikaci bez slo\u017eky \u00fahlov\u00e9 rychlosti na kontaktn\u00ed plo\u0161e. V\u00e1le\u010dky by v t\u00e9to aplikaci p\u0159idaly hmotnost, n\u00e1klady a poruchy, ani\u017e by p\u0159inesly jak\u00fdkoli funk\u010dn\u00ed p\u0159\u00ednos.<\/p>\n<\/div>\n

\n
\n
Anatomie listov\u00e9ho \u0159et\u011bzce<\/div>\n
\n
\n
Spojovac\u00ed desky<\/div>\n
Vysoce uhl\u00edkov\u00e1 ocel, tepeln\u011b zpracovan\u00e1. V\u00edce plech\u016f na pramen. Ka\u017ed\u00fd plech nese p\u0159\u00edm\u00e9 tahov\u00e9 zat\u00ed\u017een\u00ed skrz otvor pro \u010dep.<\/div>\n<\/div>\n
\n
Piny<\/div>\n
Kalen\u00e9 po cementaci. V\u011bt\u0161\u00ed pr\u016fm\u011br vzhledem k rozte\u010di ne\u017e \u010depy v\u00e1le\u010dkov\u00fdch \u0159et\u011bz\u016f \u2013 navr\u017eeno pro vysok\u00e9 cyklick\u00e9 ohybov\u00e9 a smykov\u00e9 nam\u00e1h\u00e1n\u00ed p\u0159i opakovan\u00e9m zdvihac\u00edm zat\u00ed\u017een\u00ed.<\/div>\n<\/div>\n
\n
\u017d\u00e1dn\u00e9 pouzdra ani v\u00e1le\u010dky<\/div>\n
Desky se kloubov\u011b p\u0159ipev\u0148uj\u00ed p\u0159\u00edmo na povrch \u010depu. Opot\u0159eben\u00ed \u010depu = zv\u011bt\u0161en\u00ed vnit\u0159n\u00edho otvoru desky = prodlou\u017een\u00ed.<\/div>\n<\/div>\n
\n
Vzor \u0161n\u011brov\u00e1n\u00ed<\/div>\n
Desky prokl\u00e1dan\u00e9 ve st\u0159\u00eddaj\u00edc\u00edch se sad\u00e1ch \u2013 k\u00f3dy \u0159ady AL\/BL definuj\u00ed po\u010det desek v sad\u011b a rozte\u010d.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

S\u00e9rie AL vs. BL: Syst\u00e9m pojmenov\u00e1n\u00ed a co ka\u017ed\u00e1 s\u00e9rie p\u0159edstavuje<\/h2>\n

Norma ASME B29.8 definuje dv\u011b \u0159ady lamelov\u00fdch \u0159et\u011bz\u016f \u2013 AL (rovnom\u011brn\u00e9 v\u00e1z\u00e1n\u00ed) a BL (vyv\u00e1\u017een\u00e9 v\u00e1z\u00e1n\u00ed). P\u00edsmenn\u00e1 p\u0159edpona k\u00f3duje vzor v\u00e1z\u00e1n\u00ed, kter\u00fd ur\u010duje rozlo\u017een\u00ed lamel na \u010depu. \u010c\u00edslo, kter\u00e9 n\u00e1sleduje, k\u00f3duje nejprve skupinu rozte\u010d\u00ed a pot\u00e9 po\u010det v\u00e1z\u00e1n\u00ed.<\/p>\n

V \u0159et\u011bzech \u0159ady AL jsou lamely uspo\u0159\u00e1d\u00e1ny v sad\u00e1ch stejn\u00e9ho po\u010dtu na ka\u017ed\u00e9 stran\u011b od st\u0159edov\u00e9 osy \u2013 2\u00d72, 3\u00d73, 4\u00d74 atd. V \u0159et\u011bzech \u0159ady BL m\u00e1 st\u0159edov\u00e1 sada dal\u0161\u00ed lamely, kter\u00e9 nejsou zrcadlov\u011b uspo\u0159\u00e1d\u00e1ny na obou stran\u00e1ch \u2013 pleten\u00ed je asymetrick\u00e9 v cel\u00e9m pr\u016f\u0159ezu \u0159et\u011bzu. \u0158et\u011bz BL je obecn\u011b t\u011b\u017e\u0161\u00ed a pevn\u011bj\u0161\u00ed na stoup\u00e1n\u00ed ne\u017e \u0159et\u011bz AL podobn\u00e9ho ozna\u010den\u00ed a je standardn\u00ed specifikac\u00ed pro \u0159et\u011bzy sto\u017e\u00e1r\u016f vysokozdvi\u017en\u00fdch voz\u00edk\u016f ve st\u0159edn\u00edch a velk\u00fdch pr\u016fmyslov\u00fdch vozidlech. \u0158et\u011bz AL se \u010dast\u011bji pou\u017e\u00edv\u00e1 v leh\u010d\u00edch pr\u016fmyslov\u00fdch zved\u00e1c\u00edch a vyva\u017eova\u010d\u00edch.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n
\u010c\u00edslo \u0159et\u011bzu<\/th>\nS\u00e9rie<\/th>\nRozte\u010d (mm)<\/th>\n\u0160\u00ed\u0159ka desky (mm)<\/th>\nMinim\u00e1ln\u00ed mezn\u00ed zat\u00ed\u017een\u00ed (kN)<\/th>\nBezpe\u010dn\u00e9 pracovn\u00ed zat\u00ed\u017een\u00ed dle ASME (kN)<\/th>\nTypick\u00e1 nosnost vysokozdvi\u017en\u00e9ho voz\u00edku<\/th>\n<\/tr>\n<\/thead>\n
AL622<\/td>\nAL (sud\u00fd)<\/td>\n19.05<\/td>\n8.9<\/td>\n69.0<\/td>\n17.2<\/td>\nLehk\u00fd zved\u00e1k, vyva\u017eova\u010d \u22641,5 \u200b\u200bt<\/td>\n<\/tr>\n
AL844<\/td>\nAL (sud\u00fd)<\/td>\n25.40<\/td>\n11.2<\/td>\n133.0<\/td>\n33.2<\/td>\nLehk\u00fd v\u00fdsuvn\u00fd voz\u00edk 1,5\u20132,5 t<\/td>\n<\/tr>\n
BL634<\/td>\nBL (vyv\u00e1\u017een\u00fd)<\/td>\n19.05<\/td>\n9.4<\/td>\n133.0<\/td>\n33.2<\/td>\nProtiz\u00e1va\u017eov\u00fd voz\u00edk 1,5\u20133 t<\/td>\n<\/tr>\n
BL846<\/td>\nBL (vyv\u00e1\u017een\u00fd)<\/td>\n25.40<\/td>\n11.2<\/td>\n182.0<\/td>\n45.5<\/td>\nStandardn\u00ed protiv\u00e1ha 2\u20133,5 t<\/td>\n<\/tr>\n
BL1022<\/td>\nBL (vyv\u00e1\u017een\u00fd)<\/td>\n31.75<\/td>\n12.7<\/td>\n222.0<\/td>\n55.5<\/td>\nNejb\u011b\u017en\u011bj\u0161\u00ed protiv\u00e1ha 3\u20135 t<\/td>\n<\/tr>\n
BL1034<\/td>\nBL (vyv\u00e1\u017een\u00fd)<\/td>\n31.75<\/td>\n14.3<\/td>\n311.0<\/td>\n77.8<\/td>\nVysoce v\u00fdkonn\u00fd protiz\u00e1va\u017e\u00ed 4\u20137 t<\/td>\n<\/tr>\n
BL1246<\/td>\nBL (vyv\u00e1\u017een\u00fd)<\/td>\n38.10<\/td>\n15.8<\/td>\n400.0<\/td>\n100.0<\/td>\nVelmi t\u011b\u017ek\u00fd vysokozdvi\u017en\u00fd voz\u00edk 6\u201310 t<\/td>\n<\/tr>\n
BL1666<\/td>\nBL (vyv\u00e1\u017een\u00fd)<\/td>\n50.80<\/td>\n19.0<\/td>\n756.0<\/td>\n189.0<\/td>\nT\u011b\u017ek\u00fd stohovac\u00ed\/retrakov\u00fd voz\u00edk \u226510 t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Protiintuitivn\u00ed: bezpe\u010dn\u00e9 pracovn\u00ed zat\u00ed\u017een\u00ed listov\u00e9ho \u0159et\u011bzu p\u0159i zdvihac\u00edm provozu je pouze 251 TP3T jeho minim\u00e1ln\u00ed nosnosti \u2013 nikoli 501 TP3T nebo 331 TP3T, jak se b\u011b\u017en\u011b p\u0159edpokl\u00e1d\u00e1 z b\u011b\u017en\u00e9 praxe u zdvihac\u00edch za\u0159\u00edzen\u00ed.<\/strong> Norma ASME B29.8 specifikuje konstruk\u010dn\u00ed sou\u010dinitel 4:1 (minim\u00e1ln\u00ed mezn\u00ed zat\u00ed\u017een\u00ed \u00f7 bezpe\u010dn\u00e9 pracovn\u00ed zat\u00ed\u017een\u00ed = 4). D\u016fvodem, pro\u010d je tento sou\u010dinitel vy\u0161\u0161\u00ed ne\u017e u mnoha jin\u00fdch zdvihac\u00edch komponent, je \u00fanava materi\u00e1lu, nikoli statick\u00e1 pevnost. Listov\u00fd \u0159et\u011bz je s ka\u017ed\u00fdm cyklem zdvihu vystaven opakovan\u00fdm cykl\u016fm uvoln\u011bn\u00ed nap\u011bt\u00ed a nap\u011bt\u00ed \u2013 vysokozdvi\u017en\u00fd voz\u00edk prov\u00e1d\u011bj\u00edc\u00ed 60 zdvih\u016f za hodinu b\u011bhem 8hodinov\u00e9 sm\u011bny generuje 480 cykl\u016f nap\u011bt\u00ed denn\u011b. \u0160\u00ed\u0159en\u00ed \u00fanavov\u00fdch trhlin v \u010dl\u00e1nkov\u00fdch desk\u00e1ch z vysoce uhl\u00edkov\u00e9 oceli za\u010d\u00edn\u00e1 p\u0159i \u00farovn\u00edch nap\u011bt\u00ed hluboko pod statickou mez\u00ed kluzu a konstruk\u010dn\u00ed sou\u010dinitel 4:1 poskytuje rezervu pot\u0159ebnou k dosa\u017een\u00ed po\u017eadovan\u00e9 cyklick\u00e9 \u017eivotnosti mezi intervaly kontrol definovan\u00fdmi v ASME B29.8.<\/div>\n

<\/p>\n

Jak selh\u00e1v\u00e1 listov\u00fd \u0159et\u011bz: \u00danavov\u00fd lom vs. p\u0159et\u00ed\u017een\u00ed \u2013 a pro\u010d to m\u011bn\u00ed v\u0161e o inspekci<\/h2>\n

\"\"<\/p>\n

Selh\u00e1n\u00ed p\u0159et\u00ed\u017een\u00edm \u2013 kdy je \u0159et\u011bz jednor\u00e1zov\u011b nata\u017een na svou minim\u00e1ln\u00ed mezn\u00ed s\u00edlu \u2013 nen\u00ed dominantn\u00edm zp\u016fsobem selh\u00e1n\u00ed v aplikac\u00edch vysokozdvi\u017en\u00fdch voz\u00edk\u016f a kladkostroj\u016f. Statistick\u00e1 anal\u00fdza selh\u00e1n\u00ed pole listov\u00fdch \u0159et\u011bz\u016f konzistentn\u011b ukazuje, \u017ee v\u00edce ne\u017e 85% selh\u00e1n\u00ed ve spr\u00e1vn\u011b dimenzovan\u00fdch zdvihac\u00edch syst\u00e9mech jsou \u00fanavov\u00e1 selh\u00e1n\u00ed \u2013 vznik a \u0161\u00ed\u0159en\u00ed trhlin p\u0159i opakovan\u00e9m cyklick\u00e9m zat\u00ed\u017een\u00ed, kter\u00e9 je jednotliv\u011b v r\u00e1mci konstruk\u010dn\u00ed kapacity \u0159et\u011bzu.<\/p>\n

Praktick\u00fd d\u016fsledek je z\u00e1sadn\u00ed. P\u0159et\u00ed\u017een\u00fd \u0159et\u011bz d\u00e1v\u00e1 viditeln\u00e9 varov\u00e1n\u00ed p\u0159ed selh\u00e1n\u00edm \u2013 \u010dl\u00e1nky se plasticky deformuj\u00ed a prodlou\u017een\u00ed se stane viditeln\u00fdm p\u0159ed lomem. \u00danavov\u00e1 trhlina v desce \u010dl\u00e1nku listov\u00e9ho \u0159et\u011bzu je obvykle \u0161irok\u00e1 0,2\u20130,5 mm na povrchu desky, orientovan\u00e1 kolmo k ose \u0159et\u011bzu a t\u00e9m\u011b\u0159 neviditeln\u00e1, dokud se neroz\u0161\u00ed\u0159\u00ed na p\u0159ibli\u017en\u011b 50% pr\u016f\u0159ezu desky \u2013 v tomto bod\u011b m\u016f\u017ee b\u00fdt zb\u00fdvaj\u00edc\u00ed statick\u00e1 pevnost sn\u00ed\u017eena na t\u00e9m\u011b\u0159 provozn\u00ed zat\u00ed\u017een\u00ed a lom je bezprost\u0159edn\u00ed. V dob\u011b, kdy je trhlina viditeln\u00e1 pro inspektora prov\u00e1d\u011bj\u00edc\u00edho rutinn\u00ed vizu\u00e1ln\u00ed kontrolu, se mohla \u0161\u00ed\u0159it ji\u017e n\u011bkolik stovek zvedac\u00edch cykl\u016f.<\/p>\n

Proto je prahov\u00e1 hodnota prodlou\u017een\u00ed pro listov\u00e9 \u0159et\u011bzy (2% pro standardn\u00ed provoz) ni\u017e\u0161\u00ed ne\u017e pro v\u00e1le\u010dkov\u00e9 \u0159et\u011bzy (3%) a proto je krom\u011b m\u011b\u0159en\u00ed prodlou\u017een\u00ed povinn\u00e1 i vizu\u00e1ln\u00ed kontrola trhlin, koroze a deformace lamel. Samotn\u00e9 prodlou\u017een\u00ed neodhaluje stav \u00fanavy lamel \u2013 \u0159et\u011bz m\u016f\u017ee b\u00fdt v mezi prodlou\u017een\u00ed a p\u0159esto se v \u010d\u00e1stech lamel soused\u00edc\u00edch s otvory pro \u010depy vyv\u00edjej\u00ed \u00fanavov\u00e9 trhliny.<\/p>\n

<\/p>\n

Po\u017eadavky na kontrolu listov\u00fdch \u0159et\u011bz\u016f: Povinn\u00e9 kontroly dle ASME B29.8 a EN 14659<\/h2>\n

Normy ASME B29.8 (severoamerick\u00e1 norma) i EN 14659 (evropsk\u00e1 norma, p\u0159evzat\u00e1 v dokumentaci korejsk\u00fdch v\u00fdrobc\u016f za\u0159\u00edzen\u00ed) specifikuj\u00ed minim\u00e1ln\u00ed rozsah kontrol pro listov\u00e9 \u0159et\u011bzy za provozu. Interval kontrol je obvykle definov\u00e1n v\u00fdrobcem vysokozdvi\u017en\u00e9ho voz\u00edku (OEM) v manu\u00e1lu k \u00fadr\u017eb\u011b \u2013 v\u011bt\u0161ina servisn\u00ed dokumentace korejsk\u00fdch a japonsk\u00fdch v\u00fdrobc\u016f vysokozdvi\u017en\u00fdch voz\u00edk\u016f (OEM) specifikuje minim\u00e1ln\u011b ro\u010dn\u00ed kontrolu, p\u0159i\u010dem\u017e \u010dast\u011bj\u0161\u00ed kontroly se pou\u017e\u00edvaj\u00ed p\u0159i provozu s vysok\u00fdm po\u010dtem cykl\u016f (\u0159et\u011bzy prov\u00e1d\u011bj\u00edc\u00ed v\u00edce ne\u017e 200 zvedac\u00edch cykl\u016f denn\u011b by m\u011bly b\u00fdt kontrolov\u00e1ny ka\u017ed\u00fdch 6 m\u011bs\u00edc\u016f).<\/p>\n

\n
\n
01<\/div>\n
M\u011b\u0159en\u00ed prodlou\u017een\u00ed<\/div>\n

Zm\u011b\u0159te rozp\u011bt\u00ed 12 \u010dl\u00e1nk\u016f na t\u0159ech m\u00edstech \u0159et\u011bzu. \u0158et\u011bz vy\u0159a\u010fte z provozu, pokud nam\u011b\u0159en\u00e9 prodlou\u017een\u00ed p\u0159ekro\u010d\u00ed 2,01 TP3T (standardn\u00ed), 1,51 TP3T (korozn\u00ed nebo r\u00e1zov\u00e9 zat\u00ed\u017een\u00ed) nebo ni\u017e\u0161\u00ed prahovou hodnotu v\u00fdrobce, pokud je specifikov\u00e1na. Prodlou\u017een\u00ed listov\u00e9ho \u0159et\u011bzu je zp\u016fsobeno opot\u0159eben\u00edm otvoru pro \u010dep \u2013 stejn\u00fd mechanismus jako u v\u00e1le\u010dkov\u00e9ho \u0159et\u011bzu, ale bez pouzdra, kter\u00e9 by poskytovalo mezilehlou opot\u0159ebitelnou plochu.<\/p>\n<\/div>\n

\n
02<\/div>\n
Kontrola trhlin v plechu<\/div>\n

P\u0159ed kontrolou \u0159et\u011bz d\u016fkladn\u011b o\u010dist\u011bte. Zkontrolujte ka\u017ed\u00fd povrch \u010dl\u00e1nkov\u00e9 desti\u010dky za dostate\u010dn\u00e9ho osv\u011btlen\u00ed \u2013 alespo\u0148 v st\u0159\u00eddav\u00fdch intervalech kontroly je nutn\u00e1 zkou\u0161ka s 10\u00d7 lupou nebo penetra\u010dn\u00edm barvivem. Trhliny jsou obvykle p\u0159\u00ed\u010dn\u00e9 (kolm\u00e9 k ose \u0159et\u011bzu) a za\u010d\u00ednaj\u00ed na okraji otvoru pro \u010dep. Jak\u00e1koli viditeln\u00e1 trhlina je okam\u017eit\u00fdm krit\u00e9riem pro vy\u0159azen\u00ed \u2013 kontrola prodlou\u017een\u00ed nen\u00ed nutn\u00e1.<\/p>\n<\/div>\n

\n
03<\/div>\n
Posouzen\u00ed koroze<\/div>\n

Lehk\u00e1 povrchov\u00e1 rez na \u010delech desky je p\u0159ijateln\u00e1, pokud je omezena na povrch a lze ji odstranit \u010dist\u00fdm had\u0159\u00edkem. Hlubok\u00e1 d\u016flkov\u00e1 koroze, odlupuj\u00edc\u00ed se rez nebo koroze na rozhran\u00ed \u010dep-deska, kter\u00e1 nen\u00ed odstraniteln\u00e1, vy\u017eaduje vy\u0159azen\u00ed. D\u016flkov\u00e9 spojovac\u00ed desky maj\u00ed podstatn\u011b vy\u0161\u0161\u00ed faktor koncentrace nap\u011bt\u00ed ne\u017e hladk\u00e1 deska \u2013 i m\u011blk\u00e1 d\u016flkov\u00e1 koroze o hloubce 0,2 mm na okraji otvoru pro \u010dep m\u016f\u017ee zkr\u00e1tit \u00fanavovou \u017eivotnost o 40\u2013601 TP3T.<\/p>\n<\/div>\n

\n
04<\/div>\n
Rotace \u010dep\u016f a pevn\u00e9 vazby<\/div>\n

Zkontrolujte, zda se v\u0161echny \u010depy voln\u011b ot\u00e1\u010dej\u00ed v otvorech desky \u2013 zad\u0159en\u00ed \u010dep\u016f nazna\u010duje korozi na rozhran\u00ed lo\u017eiska a potenci\u00e1ln\u00ed vznik \u00fanavov\u00e9 trhliny. \u0158et\u011bz v ka\u017ed\u00e9m \u010dl\u00e1nku do strany ohn\u011bte: jak\u00fdkoli odpor nebo zp\u011btn\u00e9 pru\u017en\u011bn\u00ed nazna\u010duje t\u011bsn\u00fd \u010dl\u00e1nek vy\u017eaduj\u00edc\u00ed dal\u0161\u00ed zkoum\u00e1n\u00ed. Pevn\u00e9 \u010dl\u00e1nky v listov\u00e9m \u0159et\u011bzu nejsou jen probl\u00e9mem s prodlou\u017een\u00edm \u2013 signalizuj\u00ed p\u0159et\u00ed\u017een\u00ed nebo korozi v dan\u00e9m spoji, co\u017e mohlo v\u00e9st k vzniku trhliny v desti\u010dce.<\/p>\n<\/div>\n

\n
05<\/div>\n
Stav kotevn\u00edho \u010depu a kotevn\u00edho \u010dl\u00e1nku<\/div>\n

Kotevn\u00ed \u010dl\u00e1nek (koncov\u00e9 spojen\u00ed s voz\u00edkem nebo kotevn\u00edm \u010depem sto\u017e\u00e1ru) nese neust\u00e1le pln\u00e9 statick\u00e9 zat\u00ed\u017een\u00ed jmenovit\u00e9 nosnosti. Geometrie kotevn\u00edho \u010depu a \u010dl\u00e1nku mus\u00ed b\u00fdt p\u0159i ka\u017ed\u00e9 kontrole zkontrolov\u00e1na na opot\u0159eben\u00ed \u2013 viditeln\u00e9 kontaktn\u00ed opot\u0159eben\u00ed kotevn\u00edho \u010depu nebo deformace kotevn\u00edho \u010dl\u00e1nku kolem \u010depu jsou okam\u017eit\u00fdmi krit\u00e9rii pro vy\u0159azen\u00ed. Opot\u0159eben\u00ed kotevn\u00edho \u010dl\u00e1nku je \u010dasto p\u0159ehl\u00ed\u017eeno, proto\u017ee je skryt\u00e9 v mont\u00e1\u017en\u00ed konzole.<\/p>\n<\/div>\n<\/div>\n

<\/p>\n

Meze prodlou\u017een\u00ed pro vy\u0159azen\u00ed z provozu: Referen\u010dn\u00ed hodnoty m\u011b\u0159en\u00ed 12 \u010dl\u00e1nk\u016f<\/h2>\n

Metoda 12\u010dl\u00e1nkov\u00e9ho posuvn\u00e9ho m\u011b\u0159\u00edtka pou\u017e\u00edvan\u00e1 pro v\u00e1le\u010dkov\u00e9 \u0159et\u011bzy plat\u00ed i pro listov\u00e9 \u0159et\u011bzy. Zm\u011b\u0159te vzd\u00e1lenost mezi st\u0159edy \u010dep\u016f nap\u0159\u00ed\u010d 12 \u010dl\u00e1nky a porovnejte s nomin\u00e1ln\u00ed hodnotou. P\u0159eru\u0161te pou\u017e\u00edv\u00e1n\u00ed, kdy\u017e nam\u011b\u0159en\u00e1 vzd\u00e1lenost dos\u00e1hne nebo p\u0159ekro\u010d\u00ed hodnoty v tabulce n\u00ed\u017ee.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
\u0158et\u011bzov\u00e1 \u0159ada<\/th>\nJmenovit\u00e1 rozte\u010d (mm)<\/th>\n12\u010dl\u00e1nkov\u00e1 jmenovit\u00e1 d\u00e9lka (mm)<\/th>\nOdej\u00edt do d\u016fchodu p\u0159i 2% (mm)<\/th>\nOdej\u00edt p\u0159i 1,51 TP3T (mm)<\/th>\nPou\u017eijte prahovou hodnotu 1,5%, kdy\u017e:<\/th>\n<\/tr>\n<\/thead>\n
AL622 \/ BL634<\/td>\n19.05<\/td>\n228.6<\/td>\n233.2<\/td>\n231.0<\/td>\nVenkovn\u00ed\/chlad\u00edrensk\u00e9 pou\u017eit\u00ed, vystaven\u00ed kyselin\u00e1m\/alk\u00e1li\u00edm, viditeln\u00e1 povrchov\u00e1 koroze, r\u00e1zov\u00e9 zat\u00ed\u017een\u00ed<\/td>\n<\/tr>\n
AL844 \/ BL846<\/td>\n25.40<\/td>\n304.8<\/td>\n310.9<\/td>\n309.4<\/td>\nStejn\u00e9 jako v\u00fd\u0161e<\/td>\n<\/tr>\n
BL1022 \/ BL1034<\/td>\n31.75<\/td>\n381.0<\/td>\n388.6<\/td>\n386.7<\/td>\nStejn\u00e9 jako v\u00fd\u0161e<\/td>\n<\/tr>\n
BL1246<\/td>\n38.10<\/td>\n457.2<\/td>\n466.3<\/td>\n464.1<\/td>\nStejn\u00e9 jako v\u00fd\u0161e<\/td>\n<\/tr>\n
BL1666<\/td>\n50.80<\/td>\n609.6<\/td>\n621.8<\/td>\n618.7<\/td>\nStejn\u00e9 jako v\u00fd\u0161e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Maz\u00e1n\u00ed listov\u00fdch \u0159et\u011bz\u016f: Pro\u010d je to d\u016fle\u017eit\u011bj\u0161\u00ed ne\u017e u v\u00e1le\u010dkov\u00fdch \u0159et\u011bz\u016f<\/h2>\n

Listov\u00fd \u0159et\u011bz nem\u00e1 pouzdro \u2013 povrch \u010depu dosed\u00e1 p\u0159\u00edmo na vnit\u0159n\u00ed otvor v desti\u010dce. To znamen\u00e1, \u017ee rozhran\u00ed \u010depu a otvoru nem\u00e1 \u017e\u00e1dnou mezilehlou opot\u0159ebitelnou slo\u017eku, kter\u00e1 by mohla absorbovat po\u0161kozen\u00ed d\u0159\u00edve, ne\u017e je ovlivn\u011bn konstruk\u010dn\u00ed prvek (deska). U v\u00e1le\u010dkov\u00fdch \u0159et\u011bz\u016f se pouzdro opot\u0159ebuje d\u0159\u00edve, ne\u017e se otvor v \u010dl\u00e1nkov\u00e9 desti\u010dce zv\u011bt\u0161\u00ed. U listov\u00e9ho \u0159et\u011bzu je otvor v desti\u010dce p\u0159\u00edmou dosedac\u00ed plochou. Pokud tento povrch vyschne, otvor se v d\u016fsledku abrazivn\u00edho opot\u0159eben\u00ed rychle zv\u011bt\u0161uje, urychluje prota\u017een\u00ed a \u2013 co je d\u016fle\u017eit\u011bj\u0161\u00ed \u2013 vytv\u00e1\u0159\u00ed koncentrace nap\u011bt\u00ed na okraji otvoru, kter\u00e9 iniciuj\u00ed \u00fanavov\u00e9 trhliny.<\/p>\n

Spr\u00e1vn\u00fdm maz\u00e1n\u00edm \u0159et\u011bz\u016f sto\u017e\u00e1r\u016f vysokozdvi\u017en\u00fdch voz\u00edk\u016f je olej specifick\u00fd pro dan\u00fd \u0159et\u011bz, kter\u00fd se nan\u00e1\u0161\u00ed na vnit\u0159n\u00ed povrchy desti\u010dek p\u0159i ka\u017ed\u00e9m maz\u00e1n\u00ed \u2013 nikoli mazivo. Mazivo je p\u0159\u00edli\u0161 visk\u00f3zn\u00ed na to, aby proniklo do rozhran\u00ed \u010dep-deska kapil\u00e1rn\u00edm p\u016fsoben\u00edm, a m\u00edsto toho se hromad\u00ed na vn\u011bj\u0161\u00edch povr\u0161\u00edch desti\u010dek, kde shroma\u017e\u010fuje ne\u010distoty a neposkytuje \u017e\u00e1dn\u00fd u\u017eitek v samotn\u00e9m lo\u017eiskov\u00e9m bod\u011b. Spr\u00e1vnou metodou je miner\u00e1ln\u00ed \u0159et\u011bzov\u00fd olej SAE 30\u201340 nebo ekvivalentn\u00ed syntetick\u00fd olej PAO pro aplikace v chlad\u00edrn\u00e1ch, nan\u00e1\u0161en\u00fd \u0161t\u011btcem nebo st\u0159\u00edk\u00e1n\u00edm na vnit\u0159n\u00ed povrchy desti\u010dek p\u0159i ka\u017ed\u00e9 t\u00fddenn\u00ed \u00fadr\u017eb\u011b. Norma ASME B29.8 doporu\u010duje maz\u00e1n\u00ed v intervalech nep\u0159esahuj\u00edc\u00edch 250 provozn\u00edch hodin za norm\u00e1ln\u00edch podm\u00ednek a 50 provozn\u00edch hodin v prost\u0159ed\u00edch, kde je \u0159et\u011bz vystaven kontaminaci.<\/p>\n

Pro provoz vysokozdvi\u017en\u00fdch voz\u00edk\u016f v chlad\u00edrensk\u00fdch skladovac\u00edch prost\u0159ed\u00edch (\u221220 \u00b0C a\u017e \u221210 \u00b0C) standardn\u00ed miner\u00e1ln\u00ed olej houstne do bodu, kdy na rozhran\u00ed \u010depu a desky ji\u017e nepronik\u00e1. Pro \u0159et\u011bzy sto\u017e\u00e1r\u016f vysokozdvi\u017en\u00fdch voz\u00edk\u016f v chlad\u00edrensk\u00fdch skladech mus\u00ed b\u00fdt pou\u017eito syntetick\u00e9 mazivo na \u0159et\u011bzy na b\u00e1zi PAO, ur\u010den\u00e9 pro provoz p\u0159i teplot\u00e1ch pod nulou (obvykle s bodem tuhnut\u00ed \u221240 \u00b0C). \u017divotnost listov\u00e9ho \u0159et\u011bzu v chlad\u00edrensk\u00fdch aplikac\u00edch bez spr\u00e1vn\u00e9ho maz\u00e1n\u00ed za n\u00edzk\u00fdch teplot je obvykle 40\u2013601 TP3T oproti provozn\u00ed teplot\u011b okol\u00ed a rychlost prodlu\u017eov\u00e1n\u00ed se prudce zrychluje, kdy\u017e se \u0159et\u011bz b\u011bhem prvn\u00edch 30 minut ka\u017ed\u00e9 sm\u011bny zah\u0159eje z \u221220 \u00b0C na provozn\u00ed teplotu (samotn\u00e9 teplotn\u00ed cyklov\u00e1n\u00ed zp\u016fsobuje rozd\u00edlnou tepelnou rozta\u017enost na rozhran\u00ed \u010depu a desky, co\u017e vytv\u00e1\u0159\u00ed abrazivn\u00ed t\u0159en\u00ed).<\/p>\n

\"\u0160est<\/p>\n

V\u00fdm\u011bna \u0159et\u011bzu sto\u017e\u00e1ru vysokozdvi\u017en\u00e9ho voz\u00edku: Co se mus\u00ed v\u017edy d\u011blat ve dvojic\u00edch<\/h2>\n

U vysokozdvi\u017en\u00fdch voz\u00edk\u016f se dv\u011bma \u0159et\u011bzy sto\u017e\u00e1ru \u2013 co\u017e zahrnuje prakticky v\u0161echny vysokozdvi\u017en\u00e9 voz\u00edky s protiz\u00e1va\u017e\u00edm a jmenovitou nosnost\u00ed od 1 t do 10 t \u2013 je nutn\u00e9 oba \u0159et\u011bzy v\u017edy vym\u011bnit sou\u010dasn\u011b, nikdy ne jednotliv\u011b. Tento po\u017eadavek se objevuje v ka\u017ed\u00e9 hlavn\u00ed servisn\u00ed p\u0159\u00edru\u010dce v\u00fdrobce vysokozdvi\u017en\u00fdch voz\u00edk\u016f a je povinn\u00fdm po\u017eadavkem podle normy EN 14659 pro nov\u00e9 instalace \u0159et\u011bz\u016f.<\/p>\n

D\u016fvodem je rozd\u00edln\u00e9 prodlou\u017een\u00ed. Nov\u00fd \u0159et\u011bz instalovan\u00fd na jedn\u00e9 stran\u011b sto\u017e\u00e1ru se bude postupn\u011b prodlu\u017eovat, zat\u00edmco star\u0161\u00ed \u0159et\u011bz na druh\u00e9 stran\u011b (pokud je\u0161t\u011b nen\u00ed vy\u0159azen z provozu) se bude prodlu\u017eovat odli\u0161nou rychlost\u00ed v d\u016fsledku nahromad\u011bn\u00e9 historie opot\u0159eben\u00ed. Toto rozd\u00edln\u00e9 prodlou\u017een\u00ed zp\u016fsobuje nerovnom\u011brn\u00e9 rozlo\u017een\u00ed zat\u00ed\u017een\u00ed mezi oba \u0159et\u011bzy \u2013 krat\u0161\u00ed (nov\u011bj\u0161\u00ed) \u0159et\u011bz nese ne\u00fam\u011brn\u00fd pod\u00edl nosnosti, proto\u017ee se geometrie nakl\u00e1p\u011bn\u00ed voz\u00edku posouv\u00e1. V nejhor\u0161\u00edm p\u0159\u00edpad\u011b m\u016f\u017ee vysokozdvi\u017en\u00fd voz\u00edk s jedn\u00edm nov\u00fdm a jedn\u00edm opot\u0159ebovan\u00fdm \u0159et\u011bzem zat\u00ed\u017eit nov\u011bj\u0161\u00ed \u0159et\u011bz nosnost\u00ed 110\u20131301 TP3T, zat\u00edmco opot\u0159ebovan\u00fd \u0159et\u011bz nese nosnost 70\u2013901 TP3T, co\u017e v\u00fdrazn\u011b urychluje \u00fanavu nov\u00e9ho \u0159et\u011bzu.<\/p>\n

Sou\u010dasn\u011b s v\u00fdm\u011bnou \u0159et\u011bzu zkontrolujte a vym\u011b\u0148te kladky sto\u017e\u00e1ru, pokud jsou na kontaktn\u00ed plo\u0161e kladek viditeln\u00e9 dr\u00e1\u017eky od opot\u0159eben\u00ed. U hnac\u00edch ozuben\u00fdch kol trak\u010dn\u00edch \u0159et\u011bz\u016f elektrick\u00e9ho vysokozdvi\u017en\u00e9ho voz\u00edku p\u00e1rovan\u00e1 ozuben\u00e1 kola pro pohon a trak\u010dn\u00ed syst\u00e9my vysokozdvi\u017en\u00fdch voz\u00edk\u016f<\/a> jsou k dispozici ve standardn\u00edch i zak\u00e1zkov\u00fdch konfigurac\u00edch otvor\u016f. Opot\u0159ebovan\u00e1 dr\u00e1\u017eka kladky koncentruje zat\u00ed\u017een\u00ed \u0159et\u011bzu v u\u017e\u0161\u00edm kontaktn\u00edm oblouku ne\u017e konstruk\u010dn\u00ed geometrie, \u010d\u00edm\u017e se zvy\u0161uje nap\u011bt\u00ed na lamelu v bodech ovinut\u00ed a urychluje se \u00fanava nov\u00e9ho \u0159et\u011bzu. Stav kladky p\u0159\u00edmo souvis\u00ed s \u017eivotnost\u00ed \u0159et\u011bzu \u2013 v\u00fdm\u011bna \u0159et\u011bz\u016f bez kontroly kladek je druhou nej\u010dast\u011bj\u0161\u00ed p\u0159\u00ed\u010dinou p\u0159ed\u010dasn\u00e9ho selh\u00e1n\u00ed listov\u00e9ho \u0159et\u011bzu po nespr\u00e1vn\u00e9m maz\u00e1n\u00ed.<\/p>\n

\"ozuben\u00e9<\/p>\n

\u010casto kladen\u00e9 ot\u00e1zky<\/h2>\n
\nLze opravit listov\u00fd \u0159et\u011bz zkr\u00e1cen\u00edm, pokud se jedna \u010d\u00e1st bl\u00ed\u017e\u00ed mezi prodlou\u017een\u00ed?<\/summary>\n
Ne. Zkr\u00e1cen\u00ed listov\u00e9ho \u0159et\u011bzu odstran\u011bn\u00edm \u010d\u00e1sti \u010dl\u00e1nku nen\u00ed p\u0159ijateln\u00e9 pro zdvihac\u00ed slu\u017eby podle ASME B29.8 nebo EN 14659. Odstran\u011bn\u00ed jak\u00e9hokoli \u010dl\u00e1nku vy\u017eaduje instalaci spojovac\u00edho \u010depu \u2013 spojovac\u00ed \u010depy instalovan\u00e9 v m\u00edst\u011b instalace v listov\u00e9m \u0159et\u011bzu nejsou vyrobeny se stejn\u00fdm p\u0159esahem jako \u010depy montovan\u00e9 ve v\u00fdrob\u011b, a spoj spojovac\u00edho \u010depu je proto v \u0159et\u011bzu bodem se sn\u00ed\u017eenou pevnost\u00ed. Je\u0161t\u011b z\u00e1sadn\u011bj\u0161\u00ed je, \u017ee \u0159et\u011bz, kter\u00fd byl zkr\u00e1cen, proto\u017ee jedna \u010d\u00e1st byla na mezi prodlou\u017een\u00ed, st\u00e1le obsahuje v\u0161echny ostatn\u00ed opot\u0159ebovan\u00e9 \u010dl\u00e1nky \u2013 prodlou\u017een\u00ed zb\u00fdvaj\u00edc\u00edch \u010d\u00e1st\u00ed se nad\u00e1le hromad\u00ed a zkr\u00e1cen\u00fd \u0159et\u011bz dos\u00e1hne prahov\u00e9 hodnoty pro vy\u0159azen\u00ed znovu v krat\u0161\u00ed dob\u011b ne\u017e nov\u00fd \u0159et\u011bz pln\u00e9 d\u00e9lky. V\u017edy vym\u011b\u0148ujte cel\u00fd \u0159et\u011bz, nikoli jednotliv\u00e9 \u010d\u00e1sti. V aplikac\u00edch zdvih\u00e1n\u00ed nen\u00ed \u010d\u00e1ste\u010dn\u00e1 oprava \u0159et\u011bzu opat\u0159en\u00edm na \u00fasporu n\u00e1klad\u016f \u2013 je to opat\u0159en\u00ed zvy\u0161uj\u00edc\u00ed odpov\u011bdnost.<\/div>\n<\/details>\n
\nJak\u00e1 je maxim\u00e1ln\u00ed doporu\u010den\u00e1 \u017eivotnost listov\u00e9ho \u0159et\u011bzu sto\u017e\u00e1ru vysokozdvi\u017en\u00e9ho voz\u00edku bez ohledu na nam\u011b\u0159en\u00e9 prodlou\u017een\u00ed?<\/summary>\n
V\u011bt\u0161ina servisn\u00ed dokumentace OEM pro vysokozdvi\u017en\u00e9 voz\u00edky doporu\u010duje maxim\u00e1ln\u00ed \u017eivotnost 5 let bez ohledu na nam\u011b\u0159en\u00e9 prodlou\u017een\u00ed nebo zjevn\u00fd vizu\u00e1ln\u00ed stav. Tento kalend\u00e1\u0159n\u00ed limit existuje proto, \u017ee v rozhran\u00ed \u010dep-deska m\u016f\u017ee doch\u00e1zet k \u0161\u00ed\u0159en\u00ed \u00fanavov\u00fdch trhlin a korozi zp\u016fsoby, kter\u00e9 nejsou detekovateln\u00e9 vn\u011bj\u0161\u00ed kontrolou \u2013 zejm\u00e9na v prost\u0159ed\u00ed s vlhkost\u00ed, teplotn\u00edmi cykly nebo m\u00edrn\u00fdm chemick\u00fdm vystaven\u00edm. \u0158et\u011bz s prodlou\u017een\u00edm 1,2% po 5 letech m\u016f\u017ee b\u00fdt struktur\u00e1ln\u011b naru\u0161en podpovrchov\u00fdmi \u00fanavov\u00fdmi trhlinami, kter\u00e9 se dosud neroz\u0161\u00ed\u0159ily na povrch desky. Korejsk\u00e9 p\u0159edpisy pro bezpe\u010dnost pr\u00e1ce vy\u017eaduj\u00ed ka\u017edoro\u010dn\u00ed kontrolu vysokozdvi\u017en\u00e9ho voz\u00edku certifikovan\u00fdm inspektorem; z\u00e1znamy o kontrol\u00e1ch by m\u011bly dokumentovat, zda byl krom\u011b z\u00e1znamu o m\u011b\u0159en\u00ed prodlou\u017een\u00ed pou\u017eit kalend\u00e1\u0159n\u00ed limit pro v\u00fdm\u011bnu.<\/div>\n<\/details>\n
\nJak se identifikuje BL1022, pokud zna\u010den\u00ed \u0159et\u011bzu ji\u017e nen\u00ed \u010diteln\u00e9?<\/summary>\n
Zm\u011b\u0159te t\u0159i hodnoty: rozte\u010d (rozte\u010d 10 \u010dl\u00e1nk\u016f \u00f7 10), \u0161\u00ed\u0159ku desti\u010dek (vn\u011bj\u0161\u00ed \u0161\u00ed\u0159ka jedn\u00e9 sady desti\u010dek) a spo\u010d\u00edtejte po\u010det desti\u010dek na sadu nap\u0159\u00ed\u010d \u0161\u00ed\u0159kou \u0159et\u011bzu. Pro BL1022: rozte\u010d = 31,75 mm, \u0161\u00ed\u0159ka desti\u010dek \u2248 12,7 mm a vzor pleten\u00ed ukazuje dv\u011b desti\u010dky na ka\u017ed\u00e9 vn\u011bj\u0161\u00ed plo\u0161e s dal\u0161\u00edmi vnit\u0159n\u00edmi desti\u010dkami, co\u017e d\u00e1v\u00e1 ozna\u010den\u00ed \u201evyv\u00e1\u017een\u00e9\u201c BL. D\u016fle\u017eitou potvrzuj\u00edc\u00ed kontrolou je porovn\u00e1n\u00ed pr\u016fm\u011bru \u010depu s tabulkou ASME B29.8 pro nam\u011b\u0159enou rozte\u010d \u2013 BL1022 m\u00e1 specifick\u00fd pr\u016fm\u011br \u010depu, kter\u00fd jej odli\u0161uje od \u0159et\u011bz\u016f \u0159ady AL se stejnou rozte\u010d\u00ed 31,75 mm. Pokud se tato m\u011b\u0159en\u00ed neshoduj\u00ed s publikovan\u00fdm ozna\u010den\u00edm ASME B29.8 nebo EN 14659, m\u016f\u017ee b\u00fdt \u0159et\u011bz propriet\u00e1rn\u00ed specifikac\u00ed OEM a mus\u00ed b\u00fdt objedn\u00e1n prost\u0159ednictv\u00edm v\u00fdrobce origin\u00e1ln\u00edho za\u0159\u00edzen\u00ed nebo ov\u011b\u0159en\u00e9ho zdroje k\u0159\u00ed\u017eov\u00fdch referenc\u00ed.<\/div>\n<\/details>\n
\nJe k dispozici nerezov\u00fd listov\u00fd \u0159et\u011bz a kdy by m\u011bl b\u00fdt specifikov\u00e1n?<\/summary>\n
Ano \u2013 nerezov\u00fd listov\u00fd \u0159et\u011bz z materi\u00e1lu 304 a 316L je k dispozici pro nejb\u011b\u017en\u011bj\u0161\u00ed velikosti \u0159ady BL. P\u0159\u00edpady pou\u017eit\u00ed jsou: vysokozdvi\u017en\u00e9 voz\u00edky do chlad\u00edrensk\u00fdch sklad\u016f, kde solanka nebo rozmrazovac\u00ed chemik\u00e1lie vytv\u00e1\u0159ej\u00ed korozivn\u00ed prost\u0159ed\u00ed, kter\u00e9 urychluje korozi uhl\u00edkov\u00e9 oceli; vysokozdvi\u017en\u00e9 voz\u00edky pro zpracov\u00e1n\u00ed potravin, kter\u00e9 jsou tlakov\u011b myty chlorovan\u00fdmi dezinfek\u010dn\u00edmi prost\u0159edky; a manipulace s materi\u00e1lem v n\u00e1mo\u0159n\u00edch termin\u00e1lech, kde je vystaven\u00ed soln\u00e9 mlze nep\u0159etr\u017eit\u00e9. Nerezov\u00fd listov\u00fd \u0159et\u011bz m\u00e1 ni\u017e\u0161\u00ed \u00fanavovou pevnost ne\u017e ekvivalentn\u00ed \u0159et\u011bz z uhl\u00edkov\u00e9 oceli kv\u016fli ni\u017e\u0161\u00ed mezi kluzu austenitick\u00e9 nerezov\u00e9 oceli \u2013 to znamen\u00e1, \u017ee mez prodlou\u017een\u00ed nerezov\u00e9ho listov\u00e9ho \u0159et\u011bzu p\u0159i vy\u0159azen\u00ed je obvykle 1,51 TP3T sp\u00ed\u0161e ne\u017e 21 TP3T, bez ohledu na provozn\u00ed prost\u0159ed\u00ed. Konkr\u00e9tn\u011b pro aplikace v chlad\u00edrensk\u00fdch skladech poskytuje kombinace nerezov\u00fdch plech\u016f, syntetick\u00e9ho maziva a \u010dast\u011bj\u0161\u00ed kontroly (ka\u017ed\u00fdch 6 m\u011bs\u00edc\u016f nam\u00edsto ro\u010dn\u011b) nejlep\u0161\u00ed kombinaci odolnosti proti korozi, \u017eivotnosti a bezpe\u010dnostn\u00ed rezervy.<\/div>\n<\/details>\n

<\/p>\n

\n
\n

\u0158et\u011bzov\u00e9 listy AL a BL skladem pro odesl\u00e1n\u00ed v ten sam\u00fd t\u00fdden<\/h2>\n

BL634 a\u017e BL1666 z uhl\u00edkov\u00e9 oceli a nerezov\u00e9 oceli. Dod\u00e1v\u00e1me v pln\u00e9 d\u00e9lce jako svitek nebo na\u0159ezan\u00fd na d\u00e9lku dle v\u00e1mi zadan\u00e9ho po\u010dtu \u010dl\u00e1nk\u016f. Materi\u00e1lov\u00e9 certifik\u00e1ty a dokumentace o sledovatelnosti jsou k dispozici na vy\u017e\u00e1d\u00e1n\u00ed pro z\u00e1znamy o shod\u011b zdvihac\u00edch za\u0159\u00edzen\u00ed.<\/p>\n<\/div>\n

Prohl\u00e9dn\u011bte si sortiment \u0159et\u011bz\u016f Leaf Chain<\/a>
\n\u017d\u00e1dost o radu ohledn\u011b specifikace \u0159ady BL<\/a><\/div>\n<\/div>\n<\/div>\n

St\u0159iha\u010d: Cxm<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Zved\u00e1n\u00ed a zved\u00e1n\u00ed ASME B29.8 \u00b7 ISO 4347 \u00b7 EN 14659 Listov\u00fd \u0159et\u011bz a kladkostroj: \u0158ada AL\/BL, pohony sto\u017e\u00e1r\u016f vysokozdvi\u017en\u00fdch voz\u00edk\u016f a bezpe\u010dn\u00e9 pracovn\u00ed zat\u00ed\u017een\u00ed Listov\u00fd \u0159et\u011bz nen\u00ed v\u00e1le\u010dkov\u00fd \u0159et\u011bz bez v\u00e1le\u010dk\u016f. Jedn\u00e1 se o konstruk\u010dn\u011b odli\u0161nou kategorii v\u00fdrobk\u016f s vlastn\u00edmi normami \u00fanavy materi\u00e1lu, po\u017eadavky na kontrolu a povinn\u00fdmi krit\u00e9rii pro vy\u0159azen\u00ed \u2013 a [\u2026]<\/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":[6634],"tags":[72,78,58],"class_list":["post-3325","post","type-post","status-publish","format-standard","hentry","category-chain-sprocket","tag-chain","tag-chain-sprocket","tag-sprocket"],"_links":{"self":[{"href":"https:\/\/sprocket-chain.net\/cs\/wp-json\/wp\/v2\/posts\/3325","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sprocket-chain.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sprocket-chain.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sprocket-chain.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sprocket-chain.net\/cs\/wp-json\/wp\/v2\/comments?post=3325"}],"version-history":[{"count":2,"href":"https:\/\/sprocket-chain.net\/cs\/wp-json\/wp\/v2\/posts\/3325\/revisions"}],"predecessor-version":[{"id":3327,"href":"https:\/\/sprocket-chain.net\/cs\/wp-json\/wp\/v2\/posts\/3325\/revisions\/3327"}],"wp:attachment":[{"href":"https:\/\/sprocket-chain.net\/cs\/wp-json\/wp\/v2\/media?parent=3325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sprocket-chain.net\/cs\/wp-json\/wp\/v2\/categories?post=3325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sprocket-chain.net\/cs\/wp-json\/wp\/v2\/tags?post=3325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}