Podstavek nakladalnega žerjava LIV 180 ZK

Nared, Tine (author), Jerman, Boris (mentor)

Nakladalni žerjavi so transportna sredstva, ki so običajno pritrjena na tovorna vozila ter so namenjena njihovemu natovarjanju in raztovarjanju. V splošnem so sestavljeni iz nosilne konstrukcije in hidravličnega sistema. Ena izmed glavnih komponent nosilne konstrukcije je podstavek, ki je vpet na šasijo vozila. Njegova funkcija je prenos obremenitve z žerjava na šasijo vozila in stabilizacijski sistem žerjava. Podstavek je kompleksen varjenec, ki se v praksi pogosto srečuje s težavami zaradi utrujanja. Magistrsko delo zajema razvoj povsem novega podstavka, ki bo naslavljal obstoječe težave z utrujanjem. Nov podstavek bo tako brez utrujenostnih odpovedi prenesel vsaj 250 000 najneugodnejših obremenitvenih ciklov obratovanja žerjava. Izhodišče predstavlja obstoječi prototipni podstavek žerjava LIV 180 ZK. Vse njegove montažne in vgradnje mere se ohranijo tudi pri novi rešitvi. V okviru tega magistrskega dela bomo na kratko opisati nakladalne žerjave in njihovo uporabo, pridobili ustrezne podatke o obremenitvah obravnavanega žerjava LIV 180 ZK, zasnovali več rešitev nosilne konstrukcije podstavka, ki omogočajo povišano odpornost proti utrujanju, izbrali najugodnejšo rešitev glede na konstrukcijo in načrtovano tehnologijo izdelave, izvedli podrobno analizo izbrane rešitve ter predstavili ugotovitve.

• Language: Slovenian
• Keywords: varjene konstrukcije, nakladalni žerjavi, podstavek žerjava, utrujanje gradiva, analitični izračuni, metoda končnih elementov
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [T. Nared]
• Year: 2021
• Number of pages: XXIV, 84 str.
• PID: 20.500.12556/RUL-125008
• UDC: 621.873:624.014.2:519.61(043.2)
• COBISS.SI-ID: 57174275
• Publication date in RUL: 01.03.2021

Secondary language

• Language: English
• Title: Base of the loader crane LIV 180 ZK

Abstract

Loader cranes are a means of transport, normally mounted on a truck and intended for loading and unloading from this vehicle. In general, they are assembled of a load-bearing structure and a hydraulic system. One of the main components of the load-bearing structure is a base, mounted on the vehicle chassis. Its function is to ensure the transfer of load from the loader crane onto the vehicle chassis and the stabilisation system of the loader crane. The base is a complex welded component, which is in practice usually associated with fatigue problems while in use. This master's thesis covers design a brand-new base, which will address the current issues related to material fatigue. The new base will withstand at least 250 000 of the least favourable load cycles during a loader crane's operation. The starting point of development of new base is the existing base of the LIV 180 ZK prototype. All mounting and installation dimensions of prototype are preserved. Within the scope of this master's thesis, we will briefly describe loader cranes and how they are used, acquire appropriate data on loads of the LIV 180 ZK loader crane, design several solutions for the base framework, which would ensure a better resistance against fatigue, choose the most suitable solution with regard to the design and the planned production method, performed a detailed analysis of the selected solution and presented the findings.

• Keywords: welded constructions, loader cranes, loader crane base, material fatigue, analytic calculations, finite element method