Influence of shape of cutting tool on pressure conditions in workspace of mulcher with vertical axis of rotation
Laen...
Kuupäev
2017
Kättesaadav alates
Autorid
Čedík, J.
Chyba, J.
Pexa, M.
Petrásek, S.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Nowadays there is laid great insistence on work efficiency improvement. This effort
also affects the construction of mowers such as mulchers. Mulching with a vertical axis of rotation
is very energy demanding work operation mainly, due to high energy losses. These energy losses,
but also the quality of work, are influenced by the airflow and associated conditions of pressure
inside the workspace of mulcher. Airflow in the workspace ensures repetitious contact of the
truncated forage crops with the cutting edge tool and thus ensures crushing of aboveground parts
of plants. The paper deals with the influence of the cutting tool shape on the mulcher’s inside
workspace pressure conditions with the vertical axis of rotation. The influence of the trailing edge
angle and rake angle on the pressure profile in the mulcher’s workspace with dependence on the
rotor speed was examined. Measurements were performed on a laboratory single rotor mulcher
model. It was found that in the mulcher’s workspace the vacuum is formed by virtue of the rotary
movement of the cutting tools wherein the vacuum increases with rotor speed. The maximum
measured vacuum was about 2.4 kPa and from the centre of the rotor towards its circumference
almost linearly decreases. Furthermore, it was found that with decreasing trailing edge angle and
with increasing rake angle the maximum vacuum decreases. When reducing the angle of the
trailing edge from 45° to 25° led to reduction of vacuum of about 0.3 kPa (12.6%).
Kirjeldus
Article
Märksõnad
mulcher, pressure, airflow, cutting tool, articles