Utjecaj kuta zaoštrenja vrha radnog alata hidrauličnog čekića na energetsku učinkovitost razrušavanja stijena

master's thesis

• Title: Utjecaj kuta zaoštrenja vrha radnog alata hidrauličnog čekića na energetsku učinkovitost razrušavanja stijena : diplomski rad
• Title (english): Influence of the hydraulic hammer tool tip sharpening angle on the energy efficiency of rock fragmentation : master's thesis
• Author: Tomislav Čop
• Mentor: Trpimir Kujundžić (mentor)
• Mentor: Dalibor Kuhinek (pomoć pri izradi, neposredni voditelj)
• Committee member: Trpimir Kujundžić (predsjednik povjerenstva)
• Committee member: Petar Hrženjak (član povjerenstva)
• Committee member: Želimir Veinović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Mining and Geotechnical Engineering); Zagreb
• Defense date and country: 2012-09-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering; Mining

Abstract

Kako bi se utvrdila veza između kuta zaoštrenja vrha radnog alata hidrauličnog čekića i
učinkovitosti razrušavanja stijena sastavljena je mjerna aparatura za laboratorijska
ispitivanja. Pripremljena su četiri alata sa različitim kutevima zaoštrenja vrha kojima se
udaralo na uzorke stijena valjkastog oblika. Pritom su pomoću mjernog računalnog sustava
bilježeni signali iz elektrootpornih mjernih traka koje su bile postavljene na pojedini alat.
Rezultati mjerenja su prikazani na grafovima te su detaljno analizirani. Analiza rezultata je
pokazala da postoje evidentni trendovi zavisnosti između oblika radnog alata i
uĉinkovitosti razrušavanja ispitivanih uzoraka. Dokazana je hipoteza rada, to jest
ustanovljena je povezanost između kuta zaoštrenja radnog alata i energetske učinkovitosti
pri mehaničkom razrušavanju stijena. Uz to, predložene su i smjernice za daljnja
istraživanja uz doradu nekih nedostataka mjerne aparature.

Abstract (english)

Abstract: In order to determine the relation between the hydraulic hammer tool tip angle and efficiency of rock fragmentation, the measuring apparatus for laboratory testing was constructed. Four tools with various sharpening angles were prepared. These tools were used for impacting cylindrically-shaped rock samples. The signals from strain gauges, glued on individual tools, were recorded using computer measurement system. Measured data is shown in diagrams and analyzed in details. The data analysis showed evident existence of dependency trends between tool shape and efficiency of tested samples fragmentation. The paper hypothesis was proven i.e. the connection between the tool tip sharpening angle and energy efficiency of mechanical rock fragmentation was established. Apart from the above, guidelines for further testing were established along with the improvement of certain measuring apparatus drawbacks.

• Keywords: rudarstvo; mehaničko razrušavanje stijena; energetska učinkovitost; hidraulični čekić; reflektirana energija
• Keywords (english): mining; mechanical rock fragmentation; energetic efficiency; hydraulic hammer; reflected energy
• Language: croatian
• URN:NBN: urn:nbn:hr:169:090385
• Study programme: Title: Mining Engineering; specializations in: Mining engineering, Geotechnical engineering, Waste treatment and disposal; Course: Geotechnical engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka rudarstva (magistar/magistra inženjer/inženjerka rudarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2016-03-15 14:19:41