Podizna teleskopska platforma s navojnim vretenom i škarastim mehanizmom

master's thesis

• Title (english): Lifting telescopic platform with spindle and scissor mechanism
• Author: Šime Lovrić
• Mentor: Matija Hoić (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2024-12-09, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

U ovom radu prikazan je princip teleskopske podizne platforme sa škarastim mehanizmom pogonjenim vretenom. Predstavlja ne tako čestu konfiguraciju simetričnog škarastog mehanizma kod kojeg su oba kraka prvog segmenta zglobno vezana za podlogu čime se ostvaruje stalni prijenosni omjer. Osnovu pogonskog sustava čini vreteno pogonjeno elektromotorom koje podizanjem matice otvara sklop te podiže platformu. Čitav mehanizam nalazi se u sklopu teleskopa koji se otvara podizanjem matice.
Kroz rad su predstavljena uobičajena rješenja uporabe sličnih podiznih platformi kao i postojeća rješenja primjenjiva u sklopu ovog zadatka. Nakon odabranog koncepta za razradu napravljena je kinematska analiza te usporedba rezultata s obzirom na broj segmenata škarastog mehanizma.
U proračunu je odabrano i provjereno vreteno te sve popratne komponente. Izvršena je provjera nosive konstrukcije, odnosno teleskopa, a sve zajedno potkrepljeno je FEM analizom kritičnih komponenti.
U razradi su korišteni gotovi čelični profili za oblikovanje poluga te kupovne komponente kao što su vreteno i matica, ležajevi i motor. Dan je prijedlog sustava antikorozivne zaštite u skladu sa standardom ISO 12944.

Abstract (english)

In this thesis it's presented the principle of a telescopic lifting platform with a scissor mechanism driven by a lead screw. It represents an uncommon configuration of a symmetric scissor mechanism in which both arms of the first segment are pivotally attached to the base, ensuring a constant transmission ratio. The drive system is based on a lead screw powered by an electric motor which lifts the nut to open the assembly and raise the platform. The entire mechanism is enclosed within a telescope that extends as the nut is lifted.
The paper presents typical solutions of similar lifting platforms as well as existing solutions suitable for this task. After selecting a concept for development, a kinematic analysis was conducted and the results were compared based on the number of segments in the scissor mechanism.
The lead screw and all associated components are selected and verified in the calculations. The load-bearing structure – the telescope, is analyzed, and the entire calculation is supported by FEM analysis of critical components.
During the design process, ready - made steel profiles were used for shaping the levers, along with commercially available components such as the lead screw and nut, bearings, and motor. A proposal for an anti – corrosion protection system is provided in accordance with the ISO 12944 standard.

• Keywords: podizna platforma; škarasti mehanizam; stalni prijenosni omjer; vreteno
• Keywords (english): lifting platform; scissor mechanism; constant transmission ratio; lead screw
• Language: croatian
• URN:NBN: urn:nbn:hr:235:647406
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering, Mechanics and Robotics, Autonomous Systems, Mechatronics and Robotics; Course: Design; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva (sveučilišni/a magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-12-05 19:56:59