Sany Heavy Industry has officially launched the "Intelligent Rock-Breaking" system for its SY650H and SY750H large hydraulic excavators, specifically designed for hard rock tunneling and mining operations. In traditional tunneling, operators use the bucket teeth to break rock (prying), a process that places immense stress on the boom and stick cylinders. If the operator applies too much force, the cylinder rod can buckle or the bucket teeth can break. If too little force is applied, the rock doesn't fracture, wasting time.
The new system introduces a "Hydraulic Limit Prediction" algorithm. High-precision pressure sensors are installed on the rod-side and piston-side ports of the boom and stick cylinders. The controller calculates the mechanical stress at the bucket tip based on the cylinder pressures and the geometric angle of the work equipment.
The engineering innovation is the "Torque Intervention Logic." When the system detects that the bucket tip force is approaching 90% of the yield strength of the bucket tooth (or the cylinder rod limit), the system instantly sends a signal to the engine ECU to increase the engine speed slightly, boosting hydraulic flow. This flow boost helps the operator "snap" through the rock fracture point without stalling.
Furthermore, the system features "Anti-Stall Assist." In hard rock digging, the engine often stalls due to sudden load spikes. The Sany system uses a "Feed-Forward" controller. It monitors the rate of pressure rise in the main pump. If the pressure rises faster than 50 MPa/s (indicating a hard impact is imminent), the system pre-emptively increases the engine fuel injection to build inertia. If the engine speed still drops below a critical threshold, the system automatically overrides the pump displacement, reducing the load instantly. This automation reduces fuel consumption by 10% and increases rock-breaking efficiency by 25%.
