Hydraulic load control in refuse collectors
Männistö, Ville Matti Samuel (2016)
2016
Konetekniikan koulutusohjelma
Teknisten tieteiden tiedekunta - Faculty of Engineering Sciences
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Hyväksymispäivämäärä
2016-05-04
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201604193818
https://urn.fi/URN:NBN:fi:tty-201604193818
Tiivistelmä
The binlifts of refuse collectors have a problem with binlift oscillations when the binlift is lowered slowly. The problem escalates with hot oil that has lower viscosity. Most problematic the oscillations are with an accessory scale on the binlift as it does not tolerate oscillations in the position where it takes measurements. These oscillations are caused by load control valves and wrong directional control valve spools make these oscillations worse.
To figure out possible solutions for the oscillations the thesis has comprehensive load control valve theory part which summarizes all the traditional and latest inventions related to load control valves. This information is used in selecting valves for measurements.
In this thesis there are measurements with different load control valves, directional control valve spools, restrictors, hoses and sequence valves. Measurements are done with a rear loader and they include flow and pressure measuring. These measurements are done to figure out which combination is the best compromise between energy consumption, oscillations and cost. This compromise should also fill all standardization requirements. Several solutions are found that are not ideal, one solution which is recommended and a couple of which are recommended in case oscillations are still needed to be degreased.
Future solutions are also discussed but they require many changes to the hydraulic fundamentals of the refuse collectors. These solutions are likely to be possible for the coming generations of refuse collectors.
To figure out possible solutions for the oscillations the thesis has comprehensive load control valve theory part which summarizes all the traditional and latest inventions related to load control valves. This information is used in selecting valves for measurements.
In this thesis there are measurements with different load control valves, directional control valve spools, restrictors, hoses and sequence valves. Measurements are done with a rear loader and they include flow and pressure measuring. These measurements are done to figure out which combination is the best compromise between energy consumption, oscillations and cost. This compromise should also fill all standardization requirements. Several solutions are found that are not ideal, one solution which is recommended and a couple of which are recommended in case oscillations are still needed to be degreased.
Future solutions are also discussed but they require many changes to the hydraulic fundamentals of the refuse collectors. These solutions are likely to be possible for the coming generations of refuse collectors.