| 摘要 |
PROBLEM TO BE SOLVED: To provide a plowing depth control system for rotary farm work machine that has improved traceability to the ground even when the travelling speed is changed. SOLUTION: The rotary farm work machine 3 is liftably connected to the rear of the tractor 1 and the rear cover sensor 32 for detecting the turning angle of the rear cover 3a is liftably and rotatably attached to the work machine 3, further in order to hold the plowing depth at a target value that is set by the plowing depth adjusting dial 7, the lift arm 26 is moved vertically or turned around and the turning angle of the rear cover 3a is adjusted so as to control the vertical motion of the work machine 3. A pitching angle velocity sensor 19 is set to the tractor 1 and a lifting means is set for lifting the work machine 3 on the basis of both the values detected by the rear cover sensor 32 and the values detected by the pitching angle speed sensor 19, and the lifting speed of the work machine lifter is corrected according to the running speed of the tractor 1, namely when the running speed is fast, the lifting speed of the work machine 3 is increased, while the running speed is low, the lifting speed of the work machine 3 is decreased. COPYRIGHT: (C)2007,JPO&INPIT
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