Control device for excavating machinery

Abstract

To provide a control device for an excavator capable of proceeding with construction while maintaining torque during construction although it is a simple control method.SOLUTION: A control device installed in an excavator is capable of executing an interlocking control mode in which rotation drive and lowering operations of a rotation drive device are performed simultaneously. When the rotational torque, which increases as the rotational resistance acting on the rotational drive device increases, reaches a first threshold Tr1 (pushing stop) while the interlocking control mode is being executed, the device switches to an independent control mode in which only the descending movement is stopped and the rotational drive is continued. When the rotational torque, which decreases as the rotational resistance acting on the rotational drive device decreases, reaches a second threshold Tr2 (pushing stop release) while the independent control mode being executed, the device switches from the independent control mode to the interlocked control mode.SELECTED DRAWING: Figure 3

Claims

1. A control device is installed in an excavation machine comprising a leader erected on a base machine, a rotary drive device that can move up and down along the leader, and a casing in which a drilling bit attached to the lower end of the cylindrical body rotates circumferentially as the rotation axis of the rotary drive device, and which is capable of executing an interlocking control mode that simultaneously performs the rotational drive and descent operation of the rotary drive device, When the rotational torque, which increases in accordance with the increase in rotational resistance acting on the rotary drive device, exceeds an upper limit that prevents damage to the drilling bit due to overload, the operation of the rotary drive device is stopped. With the aforementioned interlocking control mode in operation, The rotational torque that increases in accordance with the increase in rotational resistance acting on the rotational drive device is the upper limit A value near the upper limit and smaller than the upper limit, and the downward movement actually stops before reaching the upper limit. When the first threshold value, which is set so as not to exceed a certain value, is reached, only the downward movement is stopped. Switching to a standalone control mode that continues the rotational drive, and by switching to this standalone control mode, the casing is made to rotate in place, thereby reducing the drilling resistance acting on the drilling bit. With the aforementioned standalone control mode in operation, A control device characterized in that it switches from the standalone control mode to the interlocked control mode when the rotational torque, which decreases in accordance with the decrease in rotational resistance acting on the rotary drive device, reaches a second threshold value that is near the upper limit and smaller than the first threshold value.

2. The control device according to claim 1, characterized in that the first threshold is set within a range of 90 to 95% of the upper limit, and the second threshold is set within a range of 80 to 85% of the upper limit.

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