PURPOSE: To improve accuracy of an excavation hole by providing a detection means for a rotational frequency of a bucket and that for a push-in quantity of thrust, and also providing a control means controlling the rotational frequency to one time of the bucket and a push-in quantity from these detection means.
CONSTITUTION: An excavation control device is composed of a rotational frequency detector 28 detecting a rotational frequency of a bucket 20, a detector 29 detecting a push-in quantity of a thrust cylinder 17, and a controller 30 controlling both the detectors 28 and 29. The rotational frequency detector 28 is faced with teeth of a gear 19, and one pulse per tooth is outputted to the controller 30. With the push-in quantity detector 29, a stroke of the thrust cylinder 17 is detected, and a stroke signal is outputted to the controller 30. Moreover the controller 30 is made a mechanism controlling a rotational frequency to one time of the bucket 20 and a push-in quantity of the thrust cylinder 17 from these pulse and stroke signals. This can excavate a highly accurate excavation hole.
KUSUMI HIROSHI
NOZAKI SATOSHI
