[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.samalex.cz\/pracky-ktere-ne-znate\/#Article","mainEntityOfPage":"https:\/\/www.samalex.cz\/pracky-ktere-ne-znate\/","headline":"Pra\u010dky, kter\u00e9 (ne)zn\u00e1te","name":"Pra\u010dky, kter\u00e9 (ne)zn\u00e1te","description":"Nejsp\u00ed\u0161e jste u\u017e sly\u0161eli i pojem \u201epra\u010dka na pen\u00edze\u201c. Ten se ale zcela vymyk\u00e1 konvenc\u00edm typick\u00e9ho prac\u00edho stroje a nav\u00edc je to nez\u00e1konn\u00e9. Proto se zde tomuto term\u00ednu pro jistotu … ","datePublished":"2019-10-02","dateModified":"2019-10-02","author":{"@type":"Person","@id":"https:\/\/www.samalex.cz\/author\/#Person","name":"samalex.cz\n","url":"https:\/\/www.samalex.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/4a71ad3e3da672fdab00dac6e0f7e744f8cb217202b101d0ffab0cf07645e95c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/4a71ad3e3da672fdab00dac6e0f7e744f8cb217202b101d0ffab0cf07645e95c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"samalex.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.samalex.cz\/wp-content\/uploads\/img_a357066_w3208_t1571731207.jpg","url":"https:\/\/www.samalex.cz\/wp-content\/uploads\/img_a357066_w3208_t1571731207.jpg","height":0,"width":0},"url":"https:\/\/www.samalex.cz\/pracky-ktere-ne-znate\/","about":["Technika"],"wordCount":441,"articleBody":"Nejsp\u00ed\u0161e jste u\u017e sly\u0161eli i pojem \u201epra\u010dka na pen\u00edze\u201c. Ten se ale zcela vymyk\u00e1 konvenc\u00edm typick\u00e9ho prac\u00edho stroje a nav\u00edc je to nez\u00e1konn\u00e9. Proto se zde tomuto term\u00ednu pro jistotu v\u011bnovat nebudeme v\u016fbec. Ve stroj\u00edrensk\u00fdch v\u00fdrobn\u00edch podnic\u00edch mohou pra\u010dky slou\u017eit k\u00a0om\u00edl\u00e1n\u00ed ot\u0159ep\u016f a ne\u010distot z\u00a0nejr\u016fzn\u011bj\u0161\u00edch v\u00fdrobk\u016f. Pra\u010dku ale m\u016f\u017eete naj\u00edt i ve stavebnictv\u00ed.V\u00a0tomto oboru se vyu\u017e\u00edvaj\u00ed k\u00a0pran\u00ed kameniva o r\u016fzn\u00fdch velikostech, zne\u010di\u0161t\u011bn\u00e9ho nap\u0159\u00edklad j\u00edlem, hl\u00ednou a jin\u00fdmi l\u00e1tkami. Je d\u016fle\u017eit\u00fd dostatek – nebo sp\u00ed\u0161e p\u0159ebytek vody uvnit\u0159, kter\u00fd ne\u017e\u00e1douc\u00ed prvky odplavuje. \u00a0Tyto pra\u010dky mohou b\u00fdt \u201evanov\u00e9\u201c nebo \u201ebubnov\u00e9\u201c.\tVanov\u00e1 pra\u010dkaVanov\u00e1 pra\u010dka na sypk\u00e9 hmoty (p\u00edsek) je slo\u017eena z\u00a0m\u00edrn\u011b sklon\u011bn\u00e9ho plechov\u00e9ho koryta, uvnit\u0159 kter\u00e9ho je ot\u00e1\u010dej\u00edc\u00ed se h\u0159\u00eddel a \u0161nek. Horn\u00edm koncem p\u0159it\u00e9k\u00e1 voda a p\u00edsek se sype do konce doln\u00edho. P\u00edsek je pak \u0161nekem vytla\u010dov\u00e1n nahoru a b\u011bhem toho je postupn\u011b proplachov\u00e1n vodou. Probl\u00e9mem b\u00fdv\u00e1 odplavov\u00e1n\u00ed nejjemn\u011bj\u0161\u00edch zrnek p\u00edsku, co\u017e m\u016f\u017ee sni\u017eovat soudr\u017enost v\u00fdsledn\u00e9 hmoty.\tBubnov\u00e1 pra\u010dkaBubnov\u00e1 pra\u010dka je plechov\u00fd v\u00e1lec, kter\u00fd je rovn\u011b\u017e m\u00edrn\u011b naklon\u011bn\u00fd. Pou\u017e\u00edv\u00e1 se kup\u0159\u00edkladu k\u00a0\u010di\u0161t\u011bn\u00ed \u0161t\u011brku. Rozd\u00edlem je to, \u017ee se voda p\u0159iv\u00e1d\u00ed sprchou. Tak se kamenivo, kter\u00e9 je b\u011bhem procesu p\u0159evalov\u00e1no, l\u00e9pe umyje. Sou\u010d\u00e1st\u00ed za\u0159\u00edzen\u00ed je i t\u0159\u00eddi\u010d, co\u017e je strojn\u00ed za\u0159\u00edzen\u00ed slou\u017e\u00edc\u00ed k\u00a0odd\u011blov\u00e1n\u00ed rozli\u010dn\u011b velk\u00fdch frakc\u00ed zeminy a kameniva a m\u00edv\u00e1 r\u016fzn\u011b velk\u00e1 s\u00edta dle pot\u0159eby.\tT\u0159\u00eddi\u010deV\u00a0t\u0159\u00eddi\u010di bubnov\u00e9 pra\u010dky nejprve odte\u010de zne\u010di\u0161t\u011bn\u00e1 voda a n\u00e1sledn\u011b je d\u00edky n\u011bmu mo\u017en\u00e9 \u010dist\u00e9 kamenivo vyt\u0159\u00eddit na po\u017eadovan\u00e9 velikosti. T\u0159\u00eddi\u010de mohou b\u00fdt v\u00e1lcov\u00e9, dvoupl\u00e1\u0161\u0165ov\u00e9 se dv\u011bma s\u00edty (nejprve hrub\u0161\u00ed a pl\u00e1\u0161\u0165 jemn\u011bj\u0161\u00ed), n\u011bkolikaplo\u0161n\u00e9 s\u00a0v\u00edce s\u00edty um\u00edst\u011bn\u00fdch nad sebou. Rovn\u011b\u017e b\u00fdvaj\u00ed t\u0159\u00eddic\u00ed za\u0159\u00edzen\u00ed vibra\u010dn\u00ed, vodn\u00ed nebo vzduchov\u00e9. T\u0159\u00eddi\u010dem mohou b\u00fdt i \u201eoby\u010dejn\u00e9\u201c samostatn\u00e9 t\u0159\u00eddic\u00ed s\u00edta nebo ro\u0161ty. Ty je mo\u017en\u00e9 vid\u011bt t\u0159eba u drobn\u00fdch staveb a rodinn\u00fdch domk\u016f.                                                                                                                                                                                                                                                                                                                                                                                        4.4\/5 - (5 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Pra\u010dky, kter\u00e9 (ne)zn\u00e1te","item":"https:\/\/www.samalex.cz\/pracky-ktere-ne-znate\/#breadcrumbitem"}]}]