Konstrukcija prednjeg utovarivača za traktore snage od 30 do 50 kw

undergraduate thesis

• Title (english): Design of a front loader for tractors of a power rating from 30 to 50 kW
• Author: Ivan Presečan
• Mentor: Rudolf Tomić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; (Department of IC Engines and Mechanical Handling Equipment); (Chair of IC Engines and Motor Vehicles); Zagreb
• Defense date and country: 2024-09-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

Poljoprivredni poslovi temelje se na prenošenju raznih tereta. Potreba za prenošenjem teških tereta javlja se još početkom 1950-tih godina. Tako Karl-Ragnar Astrӧm izumljuje prvi koncept prednjeg traktorskog utovarivača kako bi olakšao utovar sijena na prikolicu. U današnje vrijeme upotreba prednjeg traktorskog utovarivača je raznolika kao na primjer prenošenje stajskog gnoja, pijeska, paleta, šljunka...
U ovom radu predstavljen je pregled današnjih konstrukcijski rješenja prednjeg traktorskog utovarivača na tržištu. Proučeni su pravilnici prema kojima poljoprivredno vozilo mora poštovati ograničenja dimenzija i težine kako bi se moglo homologirati. Provedeno je koncipiranje proizvoda tako što je na osnovi utvrđene liste zahtjeva izrađena funkcijska struktura. Na temelju odabranih funkcija iz funkcijske strukture izrađena su parcijalna rješenja te su navedena u morfološkoj matrici. Izborom različitih parcijalnih rješenja koncipirana su 3 različita koncepta. Najbolji koncept je odabran na temelju utvrđenih kriterija za odabir koncepta. Nakon što je odabran najbolji koncept određeni su rubni uvjeti. Uzimajući u obzir rubne uvjete konstruiran je i dimenzioniran nosač polužnog mehanizma. Rubni uvjeti i dimenzije nosača polužnog mehanizma uzeti su za određivanje dimenzija hidrauličkih cilindara te samog polužnog mehanizma. Odabirom navedenih dimenzija izrađena je konstrukcijska razrada polužnog mehanizma. Proveden je proračun poluproizvoda polužnog mehanizma i kritičnih elementa. Na kraju su navedene sve tehničke karakteristike prednjeg traktorskog utovarivača.
Konstrukcija prednjeg traktorskog utovarivača modelirana je u programskog paketu SolidWorks 2020 te je u istom programu izrađena tehnička dokumentacija.

Abstract (english)

Agricultural work is based on the transportation of various loads. The need for transporting heavy loads began in the 1950s. Karl-Ragnar Astrӧm invented the first concept of a front-end loader to make it easier to load hay onto a trailer. Today, the use of a front-end loader is varied, including tasks such as transporting manure, sand, pallets, gravel, and more.
This paper presents an overview of current design solutions for front-end loaders on the market. Regulations that agricultural vehicles must respect to regarding size and weight limits for homologation were studied in this paper. Product conceptualization was carried out by creating a functional structure based on a specifically defined list of requirements. Partial solutions were developed based on the selected functions from the functional structure and were listed in a morphological matrix. By selecting different partial solutions, three different concepts were devised. The best concept was chosen based on established selection criteria. After the best concept was selected, boundary conditions were defined. Considering these boundary conditions, a lever mechanism bracket was designed and dimensioned. The boundary conditions and dimensions of the lever mechanism bracket were used to determine the dimensions of hydraulic cylinders and the lever mechanism itself. Based on these dimensions, the detailed design of the lever mechanism was developed. Calculations for the lever mechanism's semi-finished products and critical elements were conducted. Finally, all technical specifications for the front-end loader are listed.
The design of the front-end loader was modeled using SolidWorks 2020, and the technical documentation was also created in the same software.

• Keywords: prednji traktorski utovarivač; polužni mehanizma; hidraulički cilindar; konstrukcijska razrada
• Keywords (english): front-end loader; lever mechanism; hydraulic cylinder; detailed design
• Language: croatian
• URN:NBN: urn:nbn:hr:235:142266
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-09-23 12:40:16