OPERATING METHOD OF UNLOADER, RECLAIMER OR THE LIKE TO DELIVER FIXED QUANTITY

PURPOSE:To provide an operating method to deliver a fixed quantity of a bulk material in cargo handling by means of a circulating excavation bucket such as an unloader and a reclaimer. CONSTITUTION:Light wave type space detectors 39, 45, 46, which take measurements of the space between a specified height of a circulating excavation bucket when it separates from a pile of a bulk material and the surface of the excavated material in the bucket, is arranged by setting its falcrum on a circulating excavation bucket supporting frame 7 of an unloader, reclaimer or the like and positioning it to the upper fixed point of the position where the said bucket separates from a pile of the bulk material, and a calculation is made of the comparison value between the excavated quantity of the bulk material inside the bucket, which is calculated from the measurement value of the detector, and the set excavation quantity of the control device whereby either the bucket sidewise speed or the bucket circulating speed or the bucket cut-in depth is automatically controlled toward the direction where the comparison value shows zero.