Real-time control of drilling and slotting parameters helps prevent hole caving, plugging, and drill burying in coal seams.
Separate water and abrasive channels prevent transfer-line wear while preserving jet force, cutting radius, and coal breaking capacity.
A separate fluid-jetting excavation tool cuts soil ahead of a foundation toe to lower driving resistance, noise, and foundation complexity.
Submicron PLA dispersions replace starch to form a tough filter cake that controls fluid loss and is removable with mild acids at low temperatures.