PURPOSE: To obtain a captioned vertical device to be able to continuously and quantitatively fed in a structure that dehydrated mud which has been dropped into a trough by means of a dehydrated mud scraping device is extruded through a cutting device having metal blades equipped with a screw and finely cut through.

CONSTITUTION: A cutting device 40 is arranged at the draining end part of a screw 39 which is in a trough 11 that has been formed in a bottom plate 10. The cutting device 40 is integrated with metal blades 48 which are radially attached for being able to be changed in their direction. By this integration, dehydrated mud scraping device unshown in the figure is pushed to the side of a drain port 13 using the screw 39. At this instant, it is finely cut trough by means of the turning blades 48 of the cutting device 40, an drained through the drain port 13. Thus, dehydrated mud can be quantitatively and continuously fed by being cut by the cutting device 40.