Weighing in at 61 t, the new Bucyrus 25C continuous miner incorporates all the robust features of the 25M series plus new features and enhancements. With two 205 kW cutter-head motors, it is the most powerful continuous miner in its class, Bucyrus claims, designed for operating heights of 0.86 – 3 m in low to mid seams with hard cutting conditions such as rock inclusions.
The 25C is equipped with 164 kW Variable Frequency Drive (VFD) traction control for higher speeds and greater control. It offers new features for maximum efficiency, productivity and extended service life. It features the latest evolution machine control system with a larger transmitter. A new generation hydraulic system features pressure and flow on demand as well as fewer components and increased component life. Both the hydraulic and VFD systems provide machine protection.
The 25C operates a broad range with maximum rated cutting head power. The cutter-head motors are protected by a torque-limiting clutch to prevent damage in the event of a rock strike. The high-strength steel drums features 51 mm thick walls with maximum bit tip standoff.
The 965 mm conveyor provides higher throughput with a bi-directional discharge forming an integral part of the mainframe. A hydraulic take-up maintains proper chain tension for all conveyor positions and extends chain life.
The164 kW VFD traction control provides higher speeds and greater torque to ground control which combined with the machine geometry facilitates cross-cut turning.
The one-piece highly robust frame uses 75 mm steel plate – 50% thicker than competitors, Bucyrus claims. The heavier, rigid frame allows more efficient cutting when sumping at the top of the seam and ripping to the bottom. The support frame fabricated from high-strength steel has massive steel legs 152.5 mm thick. The largest-in-class boom pivot bores feature hardened steel pins and replaceable bushings. The robust clevis and frame have fewer weld joints subject to tension.
The 25C is designed for easy maintenance with independent cutter heads, traction, control systems, and wethead technology. Diagnostics are located for easy access.
