Original research article
Research of Constructional and Working Characteristics of Mouldboard
1998, 63 (4) p. 199-205
J. Barčić, D. Petošić, S. Sito
Abstract
The aim of this research was to determine constructional differences between three mouldboards and their influence on specific resistance of ploughing. Characteristic angles of mouldboards a, b and g were analysed by laboratory measuring on co-ordinate system. After laboratory measuring fild testing were carried out.
Laboratory measuring determined no significant differnces between mouldboards regarding value of a angle. A considerable differences were determined with b and g angles of mouldboard A and B in comparison to mouldboard C. Initial measured values of b angle of mouldboard A and B were 31°, and 48° at mouldboard C. Initial values of g angle at first two mouldboards were 25-30°, and 40° at mouldboard C.
Field research was carried out at two velocities 4,6 km/h and 6,9 km/h, and depths within range 28 to 35 cm. Precise determination of constructional characteristics influence on specific resistance was done by increasing depth of plouging within mentioned range by 1 cm. The mean specific resistance at velocity of 4,6 km/h was 6,2 N/dm 2 for mouldboards A and B, and 5,4 N/cm 2 for mouldboard C, while the mean specific resistance at velocity of 6,9 km/h were 9,1 N/cm 2 , 7,9 N/cm 2 and 6,5 N/cm 2 for mouldboards A, B and C respectively.
The research showed that low initial value of angles a, b and g at ploughs A and B and especially its higher values towards mouldboard wing influenced higher values of specific resistance.
Keywords
mouldboard, specific resistance, plough depth, plough speed
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