Analiza načina priprave suspenzije testnega prahu v hidravličnem olju

Makuc, Grega (author), Bombač, Andrej (mentor), Majdič, Franc (co-mentor)

Standard za testiranje zmogljivosti filtriranja filtrirnih elementov v hidravličnih sistemih (ISO 16889:2008(E)) predpisuje pripravo suspenzije hidravličnega olja in testnega prahu za uporabo na testiranju. Suspenzijo je potrebno najprej mehansko pomešati nato pa eventualne skupke delcev obdelati z ultrazvokom. Standard predpisuje le gostoto moči ultrazvoka, ki mora biti med 3000 Wm-2 in 10000 Wm-2, ostali parametri pri mehanskem in ultrazvočnem vzbujanju pa so nedoločeni. Z uporabo komercialno dostopnega paličnega mešalnika in ultrazvočne kopeli smo izpolnili pogoja v standardu in pripravili suspenzijo. Pri različnih časih mehanskega pomešanja smo s pomočjo mikroskopa in računalniškega programa analizirali vzorce suspenzije in iz njih ugotavljali ustreznost načina priprave. Končni rezultati so pokazali, da je suspenzija ustrezna na vzorčenem volumnu suspenzije in da sta rotor – stator mešalo in ultrazvočna kopel ustrezna za pripravo suspenzije. Ustreznosti celotnega volumna suspenzije nismo mogli dokazati.

• Language: Slovenian
• Keywords: suspenzija, hidravlično olje, testni prah, mešanje, ultrazvok
• Work type: Bachelor thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2018
• PID: 20.500.12556/RUL-100172
• Publication date in RUL: 12.03.2018

Secondary language

• Language: English
• Title: Analysis of the preparing method of a suspension of test powder in a hydraulic oil

Abstract

Standard for evaluating filtration performance of a filter element in hydraulic systems (ISO 16889:2008(E)) defines preparation of a suspension of hydraulic oil and test dust for use in the test system. First the suspension needs to be mechanically agitated and then treated with ultrasound for elimination of potential agglomerates. Standard only defines power density of ultrasound , which needs to be between 3000 Wm-2 and 10000 Wm-2. Other parameters of a mixing process are not determined. Using commercially available hand blender and ultrasonic bath we met the conditions stated in standard and prepared suspension. At various mixing times we analyzed samples of suspension using microscope and computer program. We tried to determine the suitability of the preparing method of suspension. Results have shown that suspension in analyzed volume is suitable and that use of a rotor - stator mixer and ultrasonic bath is effective. Suitability of the whole volume of a suspension could not be determined.

• Keywords: suspension, hydraulic oil, test dust, mixing, ultrasound