| 摘要 |
PURPOSE:To enable the improvement of a detecting precision, by constituting a density detector, attached to a suction port of a pump, such that it can change a position in response to inclination of a ladder. CONSTITUTION:A density detector 9, situated around a mud suction pipe 5, has attaching stands 10 and 11 secured to an inner side surface and an inner bottom surface of a ladder 2. Guide channels 12, mounted to the attaching stands 10 and 11, are respectively formed in a circular arc, and are located along the lower periphery of the mud suction pipe 5. The guide channel 12 has a roller 13 at the inner surface thereof, and a half annular attaching plate 14, located between the guide channels 12, is situated so that its center axis coincides with that of the mud suction pipe 5. This permits changing of positions of a receiver and a generator corresponding to tilting of the ladder, and enables the improvement of accuracy of a detecting density. |
